11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * USB hub driver. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * (C) Copyright 1999 Linus Torvalds 51da177e4SLinus Torvalds * (C) Copyright 1999 Johannes Erdfelt 61da177e4SLinus Torvalds * (C) Copyright 1999 Gregory P. Smith 71da177e4SLinus Torvalds * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/errno.h> 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/moduleparam.h> 151da177e4SLinus Torvalds #include <linux/completion.h> 161da177e4SLinus Torvalds #include <linux/sched.h> 171da177e4SLinus Torvalds #include <linux/list.h> 181da177e4SLinus Torvalds #include <linux/slab.h> 191da177e4SLinus Torvalds #include <linux/ioctl.h> 201da177e4SLinus Torvalds #include <linux/usb.h> 211da177e4SLinus Torvalds #include <linux/usbdevice_fs.h> 2227729aadSEric Lescouet #include <linux/usb/hcd.h> 23925aa46bSRichard Zhao #include <linux/usb/otg.h> 2493362a87SPhil Dibowitz #include <linux/usb/quirks.h> 259c8d6178Sakpm@osdl.org #include <linux/kthread.h> 264186ecf8SArjan van de Ven #include <linux/mutex.h> 277dfb7103SNigel Cunningham #include <linux/freezer.h> 28b04b3156STheodore Ts'o #include <linux/random.h> 29ad493e5eSLan Tianyu #include <linux/pm_qos.h> 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include <asm/uaccess.h> 321da177e4SLinus Torvalds #include <asm/byteorder.h> 331da177e4SLinus Torvalds 346e30d7cbSLan Tianyu #include "hub.h" 351da177e4SLinus Torvalds 36f2a383e4SGreg Kroah-Hartman /* if we are in debug mode, always announce new devices */ 37f2a383e4SGreg Kroah-Hartman #ifdef DEBUG 38f2a383e4SGreg Kroah-Hartman #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES 39f2a383e4SGreg Kroah-Hartman #define CONFIG_USB_ANNOUNCE_NEW_DEVICES 40f2a383e4SGreg Kroah-Hartman #endif 41f2a383e4SGreg Kroah-Hartman #endif 42f2a383e4SGreg Kroah-Hartman 43e6f30deaSMing Lei #define USB_VENDOR_GENESYS_LOGIC 0x05e3 44e6f30deaSMing Lei #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 45e6f30deaSMing Lei 46dbe79bbeSJohn Youn static inline int hub_is_superspeed(struct usb_device *hdev) 47dbe79bbeSJohn Youn { 487bf01185SAman Deep return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS); 49dbe79bbeSJohn Youn } 501bb5f66bSAlan Stern 51fa286188SGreg Kroah-Hartman /* Protect struct usb_device->state and ->children members 529ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 531da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 541da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds /* khubd's worklist and its lock */ 571da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 581da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds /* Wakes up khubd */ 611da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 621da177e4SLinus Torvalds 639c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 6690ab5ee9SRusty Russell static bool blinkenlights = 0; 671da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 681da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds /* 71fd7c519dSJaroslav Kysela * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about 72fd7c519dSJaroslav Kysela * 10 seconds to send reply for the initial 64-byte descriptor request. 73fd7c519dSJaroslav Kysela */ 74fd7c519dSJaroslav Kysela /* define initial 64-byte descriptor request timeout in milliseconds */ 75fd7c519dSJaroslav Kysela static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; 76fd7c519dSJaroslav Kysela module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); 77b9cef6c3SWu Fengguang MODULE_PARM_DESC(initial_descriptor_timeout, 78b9cef6c3SWu Fengguang "initial 64-byte descriptor request timeout in milliseconds " 79b9cef6c3SWu Fengguang "(default 5000 - 5.0 seconds)"); 80fd7c519dSJaroslav Kysela 81fd7c519dSJaroslav Kysela /* 821da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 831da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 841da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 851da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 861da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 871da177e4SLinus Torvalds * following module parameters. 881da177e4SLinus Torvalds * 891da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 901da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 911da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 921da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 931da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 941da177e4SLinus Torvalds */ 9590ab5ee9SRusty Russell static bool old_scheme_first = 0; 961da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 971da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 981da177e4SLinus Torvalds "start with the old device initialization scheme"); 991da177e4SLinus Torvalds 10090ab5ee9SRusty Russell static bool use_both_schemes = 1; 1011da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 1021da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1031da177e4SLinus Torvalds "try the other device initialization scheme if the " 1041da177e4SLinus Torvalds "first one fails"); 1051da177e4SLinus Torvalds 10632fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 10732fe0198SAlan Stern * port reset on some companion controllers. 10832fe0198SAlan Stern */ 10932fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 11032fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 11132fe0198SAlan Stern 112ad493e5eSLan Tianyu #define HUB_DEBOUNCE_TIMEOUT 2000 113948fea37SAlan Stern #define HUB_DEBOUNCE_STEP 25 114948fea37SAlan Stern #define HUB_DEBOUNCE_STABLE 100 115948fea37SAlan Stern 116742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev); 117742120c6SMing Lei 118131dec34SSarah Sharp static inline char *portspeed(struct usb_hub *hub, int portstatus) 1191da177e4SLinus Torvalds { 120131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 121131dec34SSarah Sharp return "5.0 Gb/s"; 122288ead45SAlan Stern if (portstatus & USB_PORT_STAT_HIGH_SPEED) 1231da177e4SLinus Torvalds return "480 Mb/s"; 124288ead45SAlan Stern else if (portstatus & USB_PORT_STAT_LOW_SPEED) 1251da177e4SLinus Torvalds return "1.5 Mb/s"; 1261da177e4SLinus Torvalds else 1271da177e4SLinus Torvalds return "12 Mb/s"; 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 131ad493e5eSLan Tianyu struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) 1321da177e4SLinus Torvalds { 133ff823c79SLan Tianyu if (!hdev || !hdev->actconfig || !hdev->maxchild) 13425118084SAlan Stern return NULL; 1351da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1361da177e4SLinus Torvalds } 1371da177e4SLinus Torvalds 1389df89d85SXenia Ragiadakou int usb_device_supports_lpm(struct usb_device *udev) 139d9b2099cSSarah Sharp { 140d9b2099cSSarah Sharp /* USB 2.1 (and greater) devices indicate LPM support through 141d9b2099cSSarah Sharp * their USB 2.0 Extended Capabilities BOS descriptor. 142d9b2099cSSarah Sharp */ 143d9b2099cSSarah Sharp if (udev->speed == USB_SPEED_HIGH) { 144d9b2099cSSarah Sharp if (udev->bos->ext_cap && 145d9b2099cSSarah Sharp (USB_LPM_SUPPORT & 146d9b2099cSSarah Sharp le32_to_cpu(udev->bos->ext_cap->bmAttributes))) 147d9b2099cSSarah Sharp return 1; 148d9b2099cSSarah Sharp return 0; 149d9b2099cSSarah Sharp } 15051e0a012SSarah Sharp 15151e0a012SSarah Sharp /* All USB 3.0 must support LPM, but we need their max exit latency 15251e0a012SSarah Sharp * information from the SuperSpeed Extended Capabilities BOS descriptor. 15351e0a012SSarah Sharp */ 15451e0a012SSarah Sharp if (!udev->bos->ss_cap) { 15551e0a012SSarah Sharp dev_warn(&udev->dev, "No LPM exit latency info found. " 15651e0a012SSarah Sharp "Power management will be impacted.\n"); 157d9b2099cSSarah Sharp return 0; 158d9b2099cSSarah Sharp } 1599df89d85SXenia Ragiadakou 1609df89d85SXenia Ragiadakou /* udev is root hub */ 1619df89d85SXenia Ragiadakou if (!udev->parent) 1629df89d85SXenia Ragiadakou return 1; 1639df89d85SXenia Ragiadakou 16451e0a012SSarah Sharp if (udev->parent->lpm_capable) 16551e0a012SSarah Sharp return 1; 16651e0a012SSarah Sharp 16751e0a012SSarah Sharp dev_warn(&udev->dev, "Parent hub missing LPM exit latency info. " 16851e0a012SSarah Sharp "Power management will be impacted.\n"); 16951e0a012SSarah Sharp return 0; 17051e0a012SSarah Sharp } 17151e0a012SSarah Sharp 17251e0a012SSarah Sharp /* 17351e0a012SSarah Sharp * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from 17451e0a012SSarah Sharp * either U1 or U2. 17551e0a012SSarah Sharp */ 17651e0a012SSarah Sharp static void usb_set_lpm_mel(struct usb_device *udev, 17751e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 17851e0a012SSarah Sharp unsigned int udev_exit_latency, 17951e0a012SSarah Sharp struct usb_hub *hub, 18051e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 18151e0a012SSarah Sharp unsigned int hub_exit_latency) 18251e0a012SSarah Sharp { 18351e0a012SSarah Sharp unsigned int total_mel; 18451e0a012SSarah Sharp unsigned int device_mel; 18551e0a012SSarah Sharp unsigned int hub_mel; 18651e0a012SSarah Sharp 18751e0a012SSarah Sharp /* 18851e0a012SSarah Sharp * Calculate the time it takes to transition all links from the roothub 18951e0a012SSarah Sharp * to the parent hub into U0. The parent hub must then decode the 19051e0a012SSarah Sharp * packet (hub header decode latency) to figure out which port it was 19151e0a012SSarah Sharp * bound for. 19251e0a012SSarah Sharp * 19351e0a012SSarah Sharp * The Hub Header decode latency is expressed in 0.1us intervals (0x1 19451e0a012SSarah Sharp * means 0.1us). Multiply that by 100 to get nanoseconds. 19551e0a012SSarah Sharp */ 19651e0a012SSarah Sharp total_mel = hub_lpm_params->mel + 19751e0a012SSarah Sharp (hub->descriptor->u.ss.bHubHdrDecLat * 100); 19851e0a012SSarah Sharp 19951e0a012SSarah Sharp /* 20051e0a012SSarah Sharp * How long will it take to transition the downstream hub's port into 20151e0a012SSarah Sharp * U0? The greater of either the hub exit latency or the device exit 20251e0a012SSarah Sharp * latency. 20351e0a012SSarah Sharp * 20451e0a012SSarah Sharp * The BOS U1/U2 exit latencies are expressed in 1us intervals. 20551e0a012SSarah Sharp * Multiply that by 1000 to get nanoseconds. 20651e0a012SSarah Sharp */ 20751e0a012SSarah Sharp device_mel = udev_exit_latency * 1000; 20851e0a012SSarah Sharp hub_mel = hub_exit_latency * 1000; 20951e0a012SSarah Sharp if (device_mel > hub_mel) 21051e0a012SSarah Sharp total_mel += device_mel; 21151e0a012SSarah Sharp else 21251e0a012SSarah Sharp total_mel += hub_mel; 21351e0a012SSarah Sharp 21451e0a012SSarah Sharp udev_lpm_params->mel = total_mel; 21551e0a012SSarah Sharp } 21651e0a012SSarah Sharp 21751e0a012SSarah Sharp /* 21851e0a012SSarah Sharp * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate 21951e0a012SSarah Sharp * a transition from either U1 or U2. 22051e0a012SSarah Sharp */ 22151e0a012SSarah Sharp static void usb_set_lpm_pel(struct usb_device *udev, 22251e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 22351e0a012SSarah Sharp unsigned int udev_exit_latency, 22451e0a012SSarah Sharp struct usb_hub *hub, 22551e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 22651e0a012SSarah Sharp unsigned int hub_exit_latency, 22751e0a012SSarah Sharp unsigned int port_to_port_exit_latency) 22851e0a012SSarah Sharp { 22951e0a012SSarah Sharp unsigned int first_link_pel; 23051e0a012SSarah Sharp unsigned int hub_pel; 23151e0a012SSarah Sharp 23251e0a012SSarah Sharp /* 23351e0a012SSarah Sharp * First, the device sends an LFPS to transition the link between the 23451e0a012SSarah Sharp * device and the parent hub into U0. The exit latency is the bigger of 23551e0a012SSarah Sharp * the device exit latency or the hub exit latency. 23651e0a012SSarah Sharp */ 23751e0a012SSarah Sharp if (udev_exit_latency > hub_exit_latency) 23851e0a012SSarah Sharp first_link_pel = udev_exit_latency * 1000; 23951e0a012SSarah Sharp else 24051e0a012SSarah Sharp first_link_pel = hub_exit_latency * 1000; 24151e0a012SSarah Sharp 24251e0a012SSarah Sharp /* 24351e0a012SSarah Sharp * When the hub starts to receive the LFPS, there is a slight delay for 24451e0a012SSarah Sharp * it to figure out that one of the ports is sending an LFPS. Then it 24551e0a012SSarah Sharp * will forward the LFPS to its upstream link. The exit latency is the 24651e0a012SSarah Sharp * delay, plus the PEL that we calculated for this hub. 24751e0a012SSarah Sharp */ 24851e0a012SSarah Sharp hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; 24951e0a012SSarah Sharp 25051e0a012SSarah Sharp /* 25151e0a012SSarah Sharp * According to figure C-7 in the USB 3.0 spec, the PEL for this device 25251e0a012SSarah Sharp * is the greater of the two exit latencies. 25351e0a012SSarah Sharp */ 25451e0a012SSarah Sharp if (first_link_pel > hub_pel) 25551e0a012SSarah Sharp udev_lpm_params->pel = first_link_pel; 25651e0a012SSarah Sharp else 25751e0a012SSarah Sharp udev_lpm_params->pel = hub_pel; 25851e0a012SSarah Sharp } 25951e0a012SSarah Sharp 26051e0a012SSarah Sharp /* 26151e0a012SSarah Sharp * Set the System Exit Latency (SEL) to indicate the total worst-case time from 26251e0a012SSarah Sharp * when a device initiates a transition to U0, until when it will receive the 26351e0a012SSarah Sharp * first packet from the host controller. 26451e0a012SSarah Sharp * 26551e0a012SSarah Sharp * Section C.1.5.1 describes the four components to this: 26651e0a012SSarah Sharp * - t1: device PEL 26751e0a012SSarah Sharp * - t2: time for the ERDY to make it from the device to the host. 26851e0a012SSarah Sharp * - t3: a host-specific delay to process the ERDY. 26951e0a012SSarah Sharp * - t4: time for the packet to make it from the host to the device. 27051e0a012SSarah Sharp * 27151e0a012SSarah Sharp * t3 is specific to both the xHCI host and the platform the host is integrated 27251e0a012SSarah Sharp * into. The Intel HW folks have said it's negligible, FIXME if a different 27351e0a012SSarah Sharp * vendor says otherwise. 27451e0a012SSarah Sharp */ 27551e0a012SSarah Sharp static void usb_set_lpm_sel(struct usb_device *udev, 27651e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params) 27751e0a012SSarah Sharp { 27851e0a012SSarah Sharp struct usb_device *parent; 27951e0a012SSarah Sharp unsigned int num_hubs; 28051e0a012SSarah Sharp unsigned int total_sel; 28151e0a012SSarah Sharp 28251e0a012SSarah Sharp /* t1 = device PEL */ 28351e0a012SSarah Sharp total_sel = udev_lpm_params->pel; 28451e0a012SSarah Sharp /* How many external hubs are in between the device & the root port. */ 28551e0a012SSarah Sharp for (parent = udev->parent, num_hubs = 0; parent->parent; 28651e0a012SSarah Sharp parent = parent->parent) 28751e0a012SSarah Sharp num_hubs++; 28851e0a012SSarah Sharp /* t2 = 2.1us + 250ns * (num_hubs - 1) */ 28951e0a012SSarah Sharp if (num_hubs > 0) 29051e0a012SSarah Sharp total_sel += 2100 + 250 * (num_hubs - 1); 29151e0a012SSarah Sharp 29251e0a012SSarah Sharp /* t4 = 250ns * num_hubs */ 29351e0a012SSarah Sharp total_sel += 250 * num_hubs; 29451e0a012SSarah Sharp 29551e0a012SSarah Sharp udev_lpm_params->sel = total_sel; 29651e0a012SSarah Sharp } 29751e0a012SSarah Sharp 29851e0a012SSarah Sharp static void usb_set_lpm_parameters(struct usb_device *udev) 29951e0a012SSarah Sharp { 30051e0a012SSarah Sharp struct usb_hub *hub; 30151e0a012SSarah Sharp unsigned int port_to_port_delay; 30251e0a012SSarah Sharp unsigned int udev_u1_del; 30351e0a012SSarah Sharp unsigned int udev_u2_del; 30451e0a012SSarah Sharp unsigned int hub_u1_del; 30551e0a012SSarah Sharp unsigned int hub_u2_del; 30651e0a012SSarah Sharp 30751e0a012SSarah Sharp if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER) 30851e0a012SSarah Sharp return; 30951e0a012SSarah Sharp 310ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 31151e0a012SSarah Sharp /* It doesn't take time to transition the roothub into U0, since it 31251e0a012SSarah Sharp * doesn't have an upstream link. 31351e0a012SSarah Sharp */ 31451e0a012SSarah Sharp if (!hub) 31551e0a012SSarah Sharp return; 31651e0a012SSarah Sharp 31751e0a012SSarah Sharp udev_u1_del = udev->bos->ss_cap->bU1devExitLat; 3184d967995SXenia Ragiadakou udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); 31951e0a012SSarah Sharp hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; 3204d967995SXenia Ragiadakou hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); 32151e0a012SSarah Sharp 32251e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, 32351e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del); 32451e0a012SSarah Sharp 32551e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, 32651e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del); 32751e0a012SSarah Sharp 32851e0a012SSarah Sharp /* 32951e0a012SSarah Sharp * Appendix C, section C.2.2.2, says that there is a slight delay from 33051e0a012SSarah Sharp * when the parent hub notices the downstream port is trying to 33151e0a012SSarah Sharp * transition to U0 to when the hub initiates a U0 transition on its 33251e0a012SSarah Sharp * upstream port. The section says the delays are tPort2PortU1EL and 33351e0a012SSarah Sharp * tPort2PortU2EL, but it doesn't define what they are. 33451e0a012SSarah Sharp * 33551e0a012SSarah Sharp * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking 33651e0a012SSarah Sharp * about the same delays. Use the maximum delay calculations from those 33751e0a012SSarah Sharp * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For 33851e0a012SSarah Sharp * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I 33951e0a012SSarah Sharp * assume the device exit latencies they are talking about are the hub 34051e0a012SSarah Sharp * exit latencies. 34151e0a012SSarah Sharp * 34251e0a012SSarah Sharp * What do we do if the U2 exit latency is less than the U1 exit 34351e0a012SSarah Sharp * latency? It's possible, although not likely... 34451e0a012SSarah Sharp */ 34551e0a012SSarah Sharp port_to_port_delay = 1; 34651e0a012SSarah Sharp 34751e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, 34851e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del, 34951e0a012SSarah Sharp port_to_port_delay); 35051e0a012SSarah Sharp 35151e0a012SSarah Sharp if (hub_u2_del > hub_u1_del) 35251e0a012SSarah Sharp port_to_port_delay = 1 + hub_u2_del - hub_u1_del; 35351e0a012SSarah Sharp else 35451e0a012SSarah Sharp port_to_port_delay = 1 + hub_u1_del; 35551e0a012SSarah Sharp 35651e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, 35751e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del, 35851e0a012SSarah Sharp port_to_port_delay); 35951e0a012SSarah Sharp 36051e0a012SSarah Sharp /* Now that we've got PEL, calculate SEL. */ 36151e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u1_params); 36251e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u2_params); 36351e0a012SSarah Sharp } 364d9b2099cSSarah Sharp 3651da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 366dbe79bbeSJohn Youn static int get_hub_descriptor(struct usb_device *hdev, void *data) 3671da177e4SLinus Torvalds { 368dbe79bbeSJohn Youn int i, ret, size; 369dbe79bbeSJohn Youn unsigned dtype; 370dbe79bbeSJohn Youn 371dbe79bbeSJohn Youn if (hub_is_superspeed(hdev)) { 372dbe79bbeSJohn Youn dtype = USB_DT_SS_HUB; 373dbe79bbeSJohn Youn size = USB_DT_SS_HUB_SIZE; 374dbe79bbeSJohn Youn } else { 375dbe79bbeSJohn Youn dtype = USB_DT_HUB; 376dbe79bbeSJohn Youn size = sizeof(struct usb_hub_descriptor); 377dbe79bbeSJohn Youn } 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 3801da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3811da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 382dbe79bbeSJohn Youn dtype << 8, 0, data, size, 3831da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 3841da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 3851da177e4SLinus Torvalds return ret; 3861da177e4SLinus Torvalds } 3871da177e4SLinus Torvalds return -EINVAL; 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds /* 3911da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 3921da177e4SLinus Torvalds */ 3931da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 3941da177e4SLinus Torvalds { 3951da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 3961da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds /* 4001da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 4011da177e4SLinus Torvalds */ 402ad493e5eSLan Tianyu int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) 4031da177e4SLinus Torvalds { 4041da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4051da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 4061da177e4SLinus Torvalds NULL, 0, 1000); 4071da177e4SLinus Torvalds } 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds /* 4101da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 4111da177e4SLinus Torvalds */ 4121da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 4131da177e4SLinus Torvalds { 4141da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4151da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 4161da177e4SLinus Torvalds NULL, 0, 1000); 4171da177e4SLinus Torvalds } 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds /* 4201da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 4211da177e4SLinus Torvalds * for info about using port indicators 4221da177e4SLinus Torvalds */ 4231da177e4SLinus Torvalds static void set_port_led( 4241da177e4SLinus Torvalds struct usb_hub *hub, 4251da177e4SLinus Torvalds int port1, 4261da177e4SLinus Torvalds int selector 4271da177e4SLinus Torvalds ) 4281da177e4SLinus Torvalds { 4291da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 4301da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 4311da177e4SLinus Torvalds if (status < 0) 4321da177e4SLinus Torvalds dev_dbg (hub->intfdev, 4331da177e4SLinus Torvalds "port %d indicator %s status %d\n", 4341da177e4SLinus Torvalds port1, 4351da177e4SLinus Torvalds ({ char *s; switch (selector) { 4361da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 4371da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 4381da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 4391da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 4401da177e4SLinus Torvalds default: s = "??"; break; 4412b84f92bSJoe Perches } s; }), 4421da177e4SLinus Torvalds status); 4431da177e4SLinus Torvalds } 4441da177e4SLinus Torvalds 4451da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 4461da177e4SLinus Torvalds 447c4028958SDavid Howells static void led_work (struct work_struct *work) 4481da177e4SLinus Torvalds { 449c4028958SDavid Howells struct usb_hub *hub = 450c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 4511da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4521da177e4SLinus Torvalds unsigned i; 4531da177e4SLinus Torvalds unsigned changed = 0; 4541da177e4SLinus Torvalds int cursor = -1; 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 4571da177e4SLinus Torvalds return; 4581da177e4SLinus Torvalds 4593bbc47d8SKrzysztof Mazur for (i = 0; i < hdev->maxchild; i++) { 4601da177e4SLinus Torvalds unsigned selector, mode; 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds /* 30%-50% duty cycle */ 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds switch (hub->indicator[i]) { 4651da177e4SLinus Torvalds /* cycle marker */ 4661da177e4SLinus Torvalds case INDICATOR_CYCLE: 4671da177e4SLinus Torvalds cursor = i; 4681da177e4SLinus Torvalds selector = HUB_LED_AUTO; 4691da177e4SLinus Torvalds mode = INDICATOR_AUTO; 4701da177e4SLinus Torvalds break; 4711da177e4SLinus Torvalds /* blinking green = sw attention */ 4721da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 4731da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4741da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 4751da177e4SLinus Torvalds break; 4761da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 4771da177e4SLinus Torvalds selector = HUB_LED_OFF; 4781da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 4791da177e4SLinus Torvalds break; 4801da177e4SLinus Torvalds /* blinking amber = hw attention */ 4811da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 4821da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4831da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 4841da177e4SLinus Torvalds break; 4851da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 4861da177e4SLinus Torvalds selector = HUB_LED_OFF; 4871da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 4881da177e4SLinus Torvalds break; 4891da177e4SLinus Torvalds /* blink green/amber = reserved */ 4901da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 4911da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4921da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 4931da177e4SLinus Torvalds break; 4941da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 4951da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4961da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 4971da177e4SLinus Torvalds break; 4981da177e4SLinus Torvalds default: 4991da177e4SLinus Torvalds continue; 5001da177e4SLinus Torvalds } 5011da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 5021da177e4SLinus Torvalds changed = 1; 5031da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 5041da177e4SLinus Torvalds hub->indicator[i] = mode; 5051da177e4SLinus Torvalds } 5061da177e4SLinus Torvalds if (!changed && blinkenlights) { 5071da177e4SLinus Torvalds cursor++; 5083bbc47d8SKrzysztof Mazur cursor %= hdev->maxchild; 5091da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 5101da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 5111da177e4SLinus Torvalds changed++; 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds if (changed) 5141da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 5151da177e4SLinus Torvalds } 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 5181da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 5191da177e4SLinus Torvalds #define USB_STS_RETRIES 5 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds /* 5221da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 5231da177e4SLinus Torvalds */ 5241da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 5251da177e4SLinus Torvalds struct usb_hub_status *data) 5261da177e4SLinus Torvalds { 5271da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5281da177e4SLinus Torvalds 5293824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5303824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5311da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5321da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 5331da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5341da177e4SLinus Torvalds } 5351da177e4SLinus Torvalds return status; 5361da177e4SLinus Torvalds } 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds /* 5391da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 5401da177e4SLinus Torvalds */ 5411da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 5421da177e4SLinus Torvalds struct usb_port_status *data) 5431da177e4SLinus Torvalds { 5441da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5451da177e4SLinus Torvalds 5463824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5473824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5481da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5491da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 5501da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5511da177e4SLinus Torvalds } 5521da177e4SLinus Torvalds return status; 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds 5553eb14915SAlan Stern static int hub_port_status(struct usb_hub *hub, int port1, 5563eb14915SAlan Stern u16 *status, u16 *change) 5573eb14915SAlan Stern { 5583eb14915SAlan Stern int ret; 5593eb14915SAlan Stern 5603eb14915SAlan Stern mutex_lock(&hub->status_mutex); 5613eb14915SAlan Stern ret = get_port_status(hub->hdev, port1, &hub->status->port); 5623eb14915SAlan Stern if (ret < 4) { 563e9e88fb7SAlan Stern if (ret != -ENODEV) 5643eb14915SAlan Stern dev_err(hub->intfdev, 5653eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 5663eb14915SAlan Stern if (ret >= 0) 5673eb14915SAlan Stern ret = -EIO; 5683eb14915SAlan Stern } else { 5693eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 5703eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 571dbe79bbeSJohn Youn 5723eb14915SAlan Stern ret = 0; 5733eb14915SAlan Stern } 5743eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 5753eb14915SAlan Stern return ret; 5763eb14915SAlan Stern } 5773eb14915SAlan Stern 5781da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 5791da177e4SLinus Torvalds { 5801da177e4SLinus Torvalds unsigned long flags; 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 5832e2c5eeaSRoel Kluin if (!hub->disconnected && list_empty(&hub->event_list)) { 5841da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 5858e4ceb38SAlan Stern 5868e4ceb38SAlan Stern /* Suppress autosuspend until khubd runs */ 5878e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 5888e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 5891da177e4SLinus Torvalds wake_up(&khubd_wait); 5901da177e4SLinus Torvalds } 5911da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 5921da177e4SLinus Torvalds } 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 5951da177e4SLinus Torvalds { 596ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 59725118084SAlan Stern 59825118084SAlan Stern if (hub) 59925118084SAlan Stern kick_khubd(hub); 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds 6024ee823b8SSarah Sharp /* 6034ee823b8SSarah Sharp * Let the USB core know that a USB 3.0 device has sent a Function Wake Device 6044ee823b8SSarah Sharp * Notification, which indicates it had initiated remote wakeup. 6054ee823b8SSarah Sharp * 6064ee823b8SSarah Sharp * USB 3.0 hubs do not report the port link state change from U3 to U0 when the 6074ee823b8SSarah Sharp * device initiates resume, so the USB core will not receive notice of the 6084ee823b8SSarah Sharp * resume through the normal hub interrupt URB. 6094ee823b8SSarah Sharp */ 6104ee823b8SSarah Sharp void usb_wakeup_notification(struct usb_device *hdev, 6114ee823b8SSarah Sharp unsigned int portnum) 6124ee823b8SSarah Sharp { 6134ee823b8SSarah Sharp struct usb_hub *hub; 6144ee823b8SSarah Sharp 6154ee823b8SSarah Sharp if (!hdev) 6164ee823b8SSarah Sharp return; 6174ee823b8SSarah Sharp 618ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(hdev); 6194ee823b8SSarah Sharp if (hub) { 6204ee823b8SSarah Sharp set_bit(portnum, hub->wakeup_bits); 6214ee823b8SSarah Sharp kick_khubd(hub); 6224ee823b8SSarah Sharp } 6234ee823b8SSarah Sharp } 6244ee823b8SSarah Sharp EXPORT_SYMBOL_GPL(usb_wakeup_notification); 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 6277d12e780SDavid Howells static void hub_irq(struct urb *urb) 6281da177e4SLinus Torvalds { 629ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 630e015268dSAlan Stern int status = urb->status; 63171d2718fSRoel Kluin unsigned i; 6321da177e4SLinus Torvalds unsigned long bits; 6331da177e4SLinus Torvalds 634e015268dSAlan Stern switch (status) { 6351da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 6361da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 6371da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 6381da177e4SLinus Torvalds return; 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds default: /* presumably an error */ 6411da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 642e015268dSAlan Stern dev_dbg (hub->intfdev, "transfer --> %d\n", status); 6431da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 6441da177e4SLinus Torvalds goto resubmit; 645e015268dSAlan Stern hub->error = status; 6461da177e4SLinus Torvalds /* FALL THROUGH */ 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds /* let khubd handle things */ 6491da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 6501da177e4SLinus Torvalds bits = 0; 6511da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 6521da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 6531da177e4SLinus Torvalds << (i*8); 6541da177e4SLinus Torvalds hub->event_bits[0] = bits; 6551da177e4SLinus Torvalds break; 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds hub->nerrors = 0; 6591da177e4SLinus Torvalds 6601da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 6611da177e4SLinus Torvalds kick_khubd(hub); 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds resubmit: 6641da177e4SLinus Torvalds if (hub->quiescing) 6651da177e4SLinus Torvalds return; 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 6681da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 6691da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 6701da177e4SLinus Torvalds } 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 6731da177e4SLinus Torvalds static inline int 6741da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 6751da177e4SLinus Torvalds { 6762c7b871bSWilliam Gulland /* Need to clear both directions for control ep */ 6772c7b871bSWilliam Gulland if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == 6782c7b871bSWilliam Gulland USB_ENDPOINT_XFER_CONTROL) { 6792c7b871bSWilliam Gulland int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 6802c7b871bSWilliam Gulland HUB_CLEAR_TT_BUFFER, USB_RT_PORT, 6812c7b871bSWilliam Gulland devinfo ^ 0x8000, tt, NULL, 0, 1000); 6822c7b871bSWilliam Gulland if (status) 6832c7b871bSWilliam Gulland return status; 6842c7b871bSWilliam Gulland } 685c2f6595fSAlan Stern return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 6861da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 6871da177e4SLinus Torvalds tt, NULL, 0, 1000); 6881da177e4SLinus Torvalds } 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds /* 6911da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 6921da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 6931da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 6941da177e4SLinus Torvalds * both can talk to the same hub concurrently. 6951da177e4SLinus Torvalds */ 696cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 6971da177e4SLinus Torvalds { 698c4028958SDavid Howells struct usb_hub *hub = 699cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 7001da177e4SLinus Torvalds unsigned long flags; 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 7033b6054daSOctavian Purdila while (!list_empty(&hub->tt.clear_list)) { 704d0f830d3SH Hartley Sweeten struct list_head *next; 7051da177e4SLinus Torvalds struct usb_tt_clear *clear; 7061da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 707cb88a1b8SAlan Stern const struct hc_driver *drv; 7081da177e4SLinus Torvalds int status; 7091da177e4SLinus Torvalds 710d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 711d0f830d3SH Hartley Sweeten clear = list_entry (next, struct usb_tt_clear, clear_list); 7121da177e4SLinus Torvalds list_del (&clear->clear_list); 7131da177e4SLinus Torvalds 7141da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 7151da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 7161da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 717e9e88fb7SAlan Stern if (status && status != -ENODEV) 7181da177e4SLinus Torvalds dev_err (&hdev->dev, 7191da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 7201da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 721cb88a1b8SAlan Stern 722cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 723cb88a1b8SAlan Stern drv = clear->hcd->driver; 724cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 725cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 726cb88a1b8SAlan Stern 7271da177e4SLinus Torvalds kfree(clear); 728cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 7291da177e4SLinus Torvalds } 7301da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 7311da177e4SLinus Torvalds } 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds /** 734971fcd49SLan Tianyu * usb_hub_set_port_power - control hub port's power state 73541341261SMathias Nyman * @hdev: USB device belonging to the usb hub 73641341261SMathias Nyman * @hub: target hub 737971fcd49SLan Tianyu * @port1: port index 738971fcd49SLan Tianyu * @set: expected status 739971fcd49SLan Tianyu * 740971fcd49SLan Tianyu * call this function to control port's power via setting or 741971fcd49SLan Tianyu * clearing the port's PORT_POWER feature. 742626f090cSYacine Belkadi * 743626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 744971fcd49SLan Tianyu */ 74541341261SMathias Nyman int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, 74641341261SMathias Nyman int port1, bool set) 747971fcd49SLan Tianyu { 748971fcd49SLan Tianyu int ret; 749ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[port1 - 1]; 750971fcd49SLan Tianyu 751971fcd49SLan Tianyu if (set) 752971fcd49SLan Tianyu ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 753971fcd49SLan Tianyu else 754ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 755ad493e5eSLan Tianyu 756ad493e5eSLan Tianyu if (!ret) 757ad493e5eSLan Tianyu port_dev->power_is_on = set; 758971fcd49SLan Tianyu return ret; 759971fcd49SLan Tianyu } 760971fcd49SLan Tianyu 761971fcd49SLan Tianyu /** 762cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 763cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 7641da177e4SLinus Torvalds * 7651da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 7661da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 7671da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 7681da177e4SLinus Torvalds * interrupt context. 7691da177e4SLinus Torvalds * 7701da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 7711da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 772626f090cSYacine Belkadi * 773626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 7741da177e4SLinus Torvalds */ 775cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 7761da177e4SLinus Torvalds { 777cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 778cb88a1b8SAlan Stern int pipe = urb->pipe; 7791da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 7801da177e4SLinus Torvalds unsigned long flags; 7811da177e4SLinus Torvalds struct usb_tt_clear *clear; 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 7841da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 7851da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 7861da177e4SLinus Torvalds */ 78754e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 7881da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 7891da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 790cb88a1b8SAlan Stern return -ENOMEM; 7911da177e4SLinus Torvalds } 7921da177e4SLinus Torvalds 7931da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 7941da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 7951da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 7961da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 7971da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 7981da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 7991da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 8001da177e4SLinus Torvalds if (usb_pipein (pipe)) 8011da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 8021da177e4SLinus Torvalds 803cb88a1b8SAlan Stern /* info for completion callback */ 804cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 805cb88a1b8SAlan Stern clear->ep = urb->ep; 806cb88a1b8SAlan Stern 8071da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 8081da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 8091da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 810cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 8111da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 812cb88a1b8SAlan Stern return 0; 8131da177e4SLinus Torvalds } 814cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 8151da177e4SLinus Torvalds 8168520f380SAlan Stern /* If do_delay is false, return the number of milliseconds the caller 8178520f380SAlan Stern * needs to delay. 8188520f380SAlan Stern */ 8198520f380SAlan Stern static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) 8201da177e4SLinus Torvalds { 8211da177e4SLinus Torvalds int port1; 822b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 8238520f380SAlan Stern unsigned delay; 8244489a571SAlan Stern u16 wHubCharacteristics = 8254489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 8261da177e4SLinus Torvalds 8274489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 8284489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 8294489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 8304489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 8314489a571SAlan Stern * unless we send these messages to the hub. 8324489a571SAlan Stern */ 8334489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 8341da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 8354489a571SAlan Stern else 8364489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 8374489a571SAlan Stern "non-switchable hub\n"); 8383bbc47d8SKrzysztof Mazur for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) 839ad493e5eSLan Tianyu if (hub->ports[port1 - 1]->power_is_on) 8404489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 841ad493e5eSLan Tianyu else 842ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 843ad493e5eSLan Tianyu USB_PORT_FEAT_POWER); 8441da177e4SLinus Torvalds 845b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 8468520f380SAlan Stern delay = max(pgood_delay, (unsigned) 100); 8478520f380SAlan Stern if (do_delay) 8488520f380SAlan Stern msleep(delay); 8498520f380SAlan Stern return delay; 8501da177e4SLinus Torvalds } 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 8531da177e4SLinus Torvalds u16 *status, u16 *change) 8541da177e4SLinus Torvalds { 8551da177e4SLinus Torvalds int ret; 8561da177e4SLinus Torvalds 857db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 8581da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 859e9e88fb7SAlan Stern if (ret < 0) { 860e9e88fb7SAlan Stern if (ret != -ENODEV) 8611da177e4SLinus Torvalds dev_err(hub->intfdev, 862441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 863e9e88fb7SAlan Stern } else { 8641da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 8651da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 8661da177e4SLinus Torvalds ret = 0; 8671da177e4SLinus Torvalds } 868db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 8691da177e4SLinus Torvalds return ret; 8701da177e4SLinus Torvalds } 8711da177e4SLinus Torvalds 87241e7e056SSarah Sharp static int hub_set_port_link_state(struct usb_hub *hub, int port1, 87341e7e056SSarah Sharp unsigned int link_status) 87441e7e056SSarah Sharp { 87541e7e056SSarah Sharp return set_port_feature(hub->hdev, 87641e7e056SSarah Sharp port1 | (link_status << 3), 87741e7e056SSarah Sharp USB_PORT_FEAT_LINK_STATE); 87841e7e056SSarah Sharp } 87941e7e056SSarah Sharp 88041e7e056SSarah Sharp /* 88141e7e056SSarah Sharp * If USB 3.0 ports are placed into the Disabled state, they will no longer 88241e7e056SSarah Sharp * detect any device connects or disconnects. This is generally not what the 88341e7e056SSarah Sharp * USB core wants, since it expects a disabled port to produce a port status 88441e7e056SSarah Sharp * change event when a new device connects. 88541e7e056SSarah Sharp * 88641e7e056SSarah Sharp * Instead, set the link state to Disabled, wait for the link to settle into 88741e7e056SSarah Sharp * that state, clear any change bits, and then put the port into the RxDetect 88841e7e056SSarah Sharp * state. 88941e7e056SSarah Sharp */ 89041e7e056SSarah Sharp static int hub_usb3_port_disable(struct usb_hub *hub, int port1) 89141e7e056SSarah Sharp { 89241e7e056SSarah Sharp int ret; 89341e7e056SSarah Sharp int total_time; 89441e7e056SSarah Sharp u16 portchange, portstatus; 89541e7e056SSarah Sharp 89641e7e056SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 89741e7e056SSarah Sharp return -EINVAL; 89841e7e056SSarah Sharp 89941e7e056SSarah Sharp ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); 900e9e88fb7SAlan Stern if (ret) 90141e7e056SSarah Sharp return ret; 90241e7e056SSarah Sharp 90341e7e056SSarah Sharp /* Wait for the link to enter the disabled state. */ 90441e7e056SSarah Sharp for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 90541e7e056SSarah Sharp ret = hub_port_status(hub, port1, &portstatus, &portchange); 90641e7e056SSarah Sharp if (ret < 0) 90741e7e056SSarah Sharp return ret; 90841e7e056SSarah Sharp 90941e7e056SSarah Sharp if ((portstatus & USB_PORT_STAT_LINK_STATE) == 91041e7e056SSarah Sharp USB_SS_PORT_LS_SS_DISABLED) 91141e7e056SSarah Sharp break; 91241e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 91341e7e056SSarah Sharp break; 91441e7e056SSarah Sharp msleep(HUB_DEBOUNCE_STEP); 91541e7e056SSarah Sharp } 91641e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 91741e7e056SSarah Sharp dev_warn(hub->intfdev, "Could not disable port %d after %d ms\n", 91841e7e056SSarah Sharp port1, total_time); 91941e7e056SSarah Sharp 92041e7e056SSarah Sharp return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); 92141e7e056SSarah Sharp } 92241e7e056SSarah Sharp 9238b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 9248b28c752SAlan Stern { 9258b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 9260458d5b4SAlan Stern int ret = 0; 9278b28c752SAlan Stern 928ff823c79SLan Tianyu if (hub->ports[port1 - 1]->child && set_state) 929ff823c79SLan Tianyu usb_set_device_state(hub->ports[port1 - 1]->child, 9308b28c752SAlan Stern USB_STATE_NOTATTACHED); 93141e7e056SSarah Sharp if (!hub->error) { 93241e7e056SSarah Sharp if (hub_is_superspeed(hub->hdev)) 93341e7e056SSarah Sharp ret = hub_usb3_port_disable(hub, port1); 93441e7e056SSarah Sharp else 935ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, 93641e7e056SSarah Sharp USB_PORT_FEAT_ENABLE); 93741e7e056SSarah Sharp } 938e9e88fb7SAlan Stern if (ret && ret != -ENODEV) 9398b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 9408b28c752SAlan Stern port1, ret); 9418b28c752SAlan Stern return ret; 9428b28c752SAlan Stern } 9438b28c752SAlan Stern 9440458d5b4SAlan Stern /* 9456d42fcdbSJustin P. Mattock * Disable a port and mark a logical connect-change event, so that some 9460458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 9470458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 9480458d5b4SAlan Stern */ 9490458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 9507d069b7dSAlan Stern { 9510458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 9520458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 9530458d5b4SAlan Stern 9540458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 9550458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 9560458d5b4SAlan Stern * - SRP saves power that way 9570458d5b4SAlan Stern * - ... new call, TBD ... 9580458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 9590458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 9600458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 9610458d5b4SAlan Stern */ 9620458d5b4SAlan Stern 9630458d5b4SAlan Stern set_bit(port1, hub->change_bits); 9640458d5b4SAlan Stern kick_khubd(hub); 9650458d5b4SAlan Stern } 9660458d5b4SAlan Stern 967253e0572SAlan Stern /** 968253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 969253e0572SAlan Stern * @udev: device to be disabled and removed 970253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 971253e0572SAlan Stern * 972253e0572SAlan Stern * After @udev's port has been disabled, khubd is notified and it will 973253e0572SAlan Stern * see that the device has been disconnected. When the device is 974253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 975253e0572SAlan Stern * be received and processed normally. 976626f090cSYacine Belkadi * 977626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 978253e0572SAlan Stern */ 979253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 980253e0572SAlan Stern { 981253e0572SAlan Stern struct usb_hub *hub; 982253e0572SAlan Stern struct usb_interface *intf; 983253e0572SAlan Stern 984253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 985253e0572SAlan Stern return -EINVAL; 986ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 987253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 988253e0572SAlan Stern 989253e0572SAlan Stern usb_autopm_get_interface(intf); 990253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 991253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 992253e0572SAlan Stern usb_autopm_put_interface(intf); 993253e0572SAlan Stern return 0; 994253e0572SAlan Stern } 995253e0572SAlan Stern 9966ee0b270SAlan Stern enum hub_activation_type { 9978e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 9988520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 9996ee0b270SAlan Stern }; 10005e6effaeSAlan Stern 10018520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 10028520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 10038520f380SAlan Stern 1004f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 10055e6effaeSAlan Stern { 10065e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 1007653a39d1SSarah Sharp struct usb_hcd *hcd; 1008653a39d1SSarah Sharp int ret; 10095e6effaeSAlan Stern int port1; 1010f2835219SAlan Stern int status; 1011948fea37SAlan Stern bool need_debounce_delay = false; 10128520f380SAlan Stern unsigned delay; 10138520f380SAlan Stern 10148520f380SAlan Stern /* Continue a partial initialization */ 10158520f380SAlan Stern if (type == HUB_INIT2) 10168520f380SAlan Stern goto init2; 10178520f380SAlan Stern if (type == HUB_INIT3) 10188520f380SAlan Stern goto init3; 10195e6effaeSAlan Stern 1020a45aa3b3SElric Fu /* The superspeed hub except for root hub has to use Hub Depth 1021a45aa3b3SElric Fu * value as an offset into the route string to locate the bits 1022a45aa3b3SElric Fu * it uses to determine the downstream port number. So hub driver 1023a45aa3b3SElric Fu * should send a set hub depth request to superspeed hub after 1024a45aa3b3SElric Fu * the superspeed hub is set configuration in initialization or 1025a45aa3b3SElric Fu * reset procedure. 1026a45aa3b3SElric Fu * 1027a45aa3b3SElric Fu * After a resume, port power should still be on. 1028f2835219SAlan Stern * For any other type of activation, turn it on. 1029f2835219SAlan Stern */ 10308520f380SAlan Stern if (type != HUB_RESUME) { 1031a45aa3b3SElric Fu if (hdev->parent && hub_is_superspeed(hdev)) { 1032a45aa3b3SElric Fu ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1033a45aa3b3SElric Fu HUB_SET_DEPTH, USB_RT_HUB, 1034a45aa3b3SElric Fu hdev->level - 1, 0, NULL, 0, 1035a45aa3b3SElric Fu USB_CTRL_SET_TIMEOUT); 1036a45aa3b3SElric Fu if (ret < 0) 1037a45aa3b3SElric Fu dev_err(hub->intfdev, 1038a45aa3b3SElric Fu "set hub depth failed\n"); 1039a45aa3b3SElric Fu } 10408520f380SAlan Stern 10418520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 10428520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 10438520f380SAlan Stern * and the implementation looks like a home-brewed sort of 10448520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 10458520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 10468520f380SAlan Stern * rather than as a module). It adds up. 10478520f380SAlan Stern * 10488520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 10498520f380SAlan Stern * because for those activation types the ports have to be 10508520f380SAlan Stern * operational when we return. In theory this could be done 10518520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 10528520f380SAlan Stern */ 10538520f380SAlan Stern if (type == HUB_INIT) { 10548520f380SAlan Stern delay = hub_power_on(hub, false); 10558520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); 10568520f380SAlan Stern schedule_delayed_work(&hub->init_work, 10578520f380SAlan Stern msecs_to_jiffies(delay)); 105861fbeba1SAlan Stern 105961fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 10608e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 10618e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 10628520f380SAlan Stern return; /* Continues at init2: below */ 1063653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 1064653a39d1SSarah Sharp /* The internal host controller state for the hub device 1065653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 1066653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 1067653a39d1SSarah Sharp */ 1068653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1069653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 1070653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1071653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 1072653a39d1SSarah Sharp if (ret < 0) { 1073653a39d1SSarah Sharp dev_err(hub->intfdev, "Host not " 1074653a39d1SSarah Sharp "accepting hub info " 1075653a39d1SSarah Sharp "update.\n"); 1076653a39d1SSarah Sharp dev_err(hub->intfdev, "LS/FS devices " 1077653a39d1SSarah Sharp "and hubs may not work " 1078653a39d1SSarah Sharp "under this hub\n."); 1079653a39d1SSarah Sharp } 1080653a39d1SSarah Sharp } 1081653a39d1SSarah Sharp hub_power_on(hub, true); 10828520f380SAlan Stern } else { 10838520f380SAlan Stern hub_power_on(hub, true); 10848520f380SAlan Stern } 10858520f380SAlan Stern } 10868520f380SAlan Stern init2: 1087f2835219SAlan Stern 10886ee0b270SAlan Stern /* Check each port and set hub->change_bits to let khubd know 10896ee0b270SAlan Stern * which ports need attention. 10905e6effaeSAlan Stern */ 10915e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 1092ff823c79SLan Tianyu struct usb_device *udev = hub->ports[port1 - 1]->child; 10935e6effaeSAlan Stern u16 portstatus, portchange; 10945e6effaeSAlan Stern 10956ee0b270SAlan Stern portstatus = portchange = 0; 10966ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 10976ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 10986ee0b270SAlan Stern dev_dbg(hub->intfdev, 10996ee0b270SAlan Stern "port %d: status %04x change %04x\n", 11006ee0b270SAlan Stern port1, portstatus, portchange); 11015e6effaeSAlan Stern 11026ee0b270SAlan Stern /* After anything other than HUB_RESUME (i.e., initialization 11036ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 11046ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 11056ee0b270SAlan Stern * and so should ports for which we have no usb_device. 11065e6effaeSAlan Stern */ 11076ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 11086ee0b270SAlan Stern type != HUB_RESUME || 11096ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 11106ee0b270SAlan Stern !udev || 11116ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 11129f0a6cd3SAndiry Xu /* 11139f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 11149f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 1115fd1ac4cfSDan Williams * Do not disable USB3 protocol ports, just pretend 1116fd1ac4cfSDan Williams * power was lost 11179f0a6cd3SAndiry Xu */ 1118fd1ac4cfSDan Williams portstatus &= ~USB_PORT_STAT_ENABLE; 1119fd1ac4cfSDan Williams if (!hub_is_superspeed(hdev)) 1120ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port1, 11219f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 11229f0a6cd3SAndiry Xu } 11236ee0b270SAlan Stern 1124948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 1125948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 1126948fea37SAlan Stern need_debounce_delay = true; 1127ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1128948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 1129948fea37SAlan Stern } 1130948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 1131948fea37SAlan Stern need_debounce_delay = true; 1132ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1133948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 1134948fea37SAlan Stern } 1135e92aee33SJulius Werner if (portchange & USB_PORT_STAT_C_RESET) { 1136e92aee33SJulius Werner need_debounce_delay = true; 1137e92aee33SJulius Werner usb_clear_port_feature(hub->hdev, port1, 1138e92aee33SJulius Werner USB_PORT_FEAT_C_RESET); 1139e92aee33SJulius Werner } 114079c3dd81SDon Zickus if ((portchange & USB_PORT_STAT_C_BH_RESET) && 114179c3dd81SDon Zickus hub_is_superspeed(hub->hdev)) { 114279c3dd81SDon Zickus need_debounce_delay = true; 1143ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 114479c3dd81SDon Zickus USB_PORT_FEAT_C_BH_PORT_RESET); 114579c3dd81SDon Zickus } 1146253e0572SAlan Stern /* We can forget about a "removed" device when there's a 1147253e0572SAlan Stern * physical disconnect or the connect status changes. 1148253e0572SAlan Stern */ 1149253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 1150253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 1151253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 1152253e0572SAlan Stern 11536ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 11546ee0b270SAlan Stern /* Tell khubd to disconnect the device or 11556ee0b270SAlan Stern * check for a new connection 11566ee0b270SAlan Stern */ 11576ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 11586ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11596ee0b270SAlan Stern 11606ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 116172937e1eSSarah Sharp bool port_resumed = (portstatus & 116272937e1eSSarah Sharp USB_PORT_STAT_LINK_STATE) == 116372937e1eSSarah Sharp USB_SS_PORT_LS_U0; 11646ee0b270SAlan Stern /* The power session apparently survived the resume. 11656ee0b270SAlan Stern * If there was an overcurrent or suspend change 11666ee0b270SAlan Stern * (i.e., remote wakeup request), have khubd 116772937e1eSSarah Sharp * take care of it. Look at the port link state 116872937e1eSSarah Sharp * for USB 3.0 hubs, since they don't have a suspend 116972937e1eSSarah Sharp * change bit, and they don't set the port link change 117072937e1eSSarah Sharp * bit on device-initiated resume. 11716ee0b270SAlan Stern */ 117272937e1eSSarah Sharp if (portchange || (hub_is_superspeed(hub->hdev) && 117372937e1eSSarah Sharp port_resumed)) 11746ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11756ee0b270SAlan Stern 11766ee0b270SAlan Stern } else if (udev->persist_enabled) { 1177ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[port1 - 1]; 1178ad493e5eSLan Tianyu 11796ee0b270SAlan Stern #ifdef CONFIG_PM 11805e6effaeSAlan Stern udev->reset_resume = 1; 11816ee0b270SAlan Stern #endif 1182ad493e5eSLan Tianyu /* Don't set the change_bits when the device 1183ad493e5eSLan Tianyu * was powered off. 1184ad493e5eSLan Tianyu */ 1185ad493e5eSLan Tianyu if (port_dev->power_is_on) 11868808f00cSAlan Stern set_bit(port1, hub->change_bits); 11878808f00cSAlan Stern 11886ee0b270SAlan Stern } else { 11896ee0b270SAlan Stern /* The power session is gone; tell khubd */ 11906ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11916ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11925e6effaeSAlan Stern } 11935e6effaeSAlan Stern } 11945e6effaeSAlan Stern 1195948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 1196948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 1197948fea37SAlan Stern * ports all at once right now, instead of letting khubd do them 1198948fea37SAlan Stern * one at a time later on. 1199948fea37SAlan Stern * 1200948fea37SAlan Stern * If any port-status changes do occur during this delay, khubd 1201948fea37SAlan Stern * will see them later and handle them normally. 1202948fea37SAlan Stern */ 12038520f380SAlan Stern if (need_debounce_delay) { 12048520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 1205f2835219SAlan Stern 12068520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 12078520f380SAlan Stern if (type == HUB_INIT2) { 12088520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); 12098520f380SAlan Stern schedule_delayed_work(&hub->init_work, 12108520f380SAlan Stern msecs_to_jiffies(delay)); 12118520f380SAlan Stern return; /* Continues at init3: below */ 12128520f380SAlan Stern } else { 12138520f380SAlan Stern msleep(delay); 12148520f380SAlan Stern } 12158520f380SAlan Stern } 12168520f380SAlan Stern init3: 1217f2835219SAlan Stern hub->quiescing = 0; 1218f2835219SAlan Stern 1219f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 1220f2835219SAlan Stern if (status < 0) 1221f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 1222f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 1223f2835219SAlan Stern schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 1224f2835219SAlan Stern 1225f2835219SAlan Stern /* Scan all ports that need attention */ 1226f2835219SAlan Stern kick_khubd(hub); 12278e4ceb38SAlan Stern 12288e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 12298e4ceb38SAlan Stern if (type <= HUB_INIT3) 12308e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 12315e6effaeSAlan Stern } 12325e6effaeSAlan Stern 12338520f380SAlan Stern /* Implement the continuations for the delays above */ 12348520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 12358520f380SAlan Stern { 12368520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12378520f380SAlan Stern 12388520f380SAlan Stern hub_activate(hub, HUB_INIT2); 12398520f380SAlan Stern } 12408520f380SAlan Stern 12418520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 12428520f380SAlan Stern { 12438520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12448520f380SAlan Stern 12458520f380SAlan Stern hub_activate(hub, HUB_INIT3); 12468520f380SAlan Stern } 12478520f380SAlan Stern 12484330354fSAlan Stern enum hub_quiescing_type { 12494330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 12504330354fSAlan Stern }; 12514330354fSAlan Stern 12524330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 12534330354fSAlan Stern { 12544330354fSAlan Stern struct usb_device *hdev = hub->hdev; 12554330354fSAlan Stern int i; 12564330354fSAlan Stern 12578520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 12588520f380SAlan Stern 12594330354fSAlan Stern /* khubd and related activity won't re-trigger */ 12604330354fSAlan Stern hub->quiescing = 1; 12614330354fSAlan Stern 12624330354fSAlan Stern if (type != HUB_SUSPEND) { 12634330354fSAlan Stern /* Disconnect all the children */ 12644330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 1265ff823c79SLan Tianyu if (hub->ports[i]->child) 1266ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 12674330354fSAlan Stern } 12684330354fSAlan Stern } 12694330354fSAlan Stern 12704330354fSAlan Stern /* Stop khubd and related activity */ 12714330354fSAlan Stern usb_kill_urb(hub->urb); 12724330354fSAlan Stern if (hub->has_indicators) 12734330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 12744330354fSAlan Stern if (hub->tt.hub) 1275036546bfSOctavian Purdila flush_work(&hub->tt.clear_work); 12764330354fSAlan Stern } 12774330354fSAlan Stern 12783eb14915SAlan Stern /* caller has locked the hub device */ 12793eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 12803eb14915SAlan Stern { 12813eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12823eb14915SAlan Stern 12834330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 1284f07600cfSAlan Stern return 0; 12857d069b7dSAlan Stern } 12867d069b7dSAlan Stern 12877d069b7dSAlan Stern /* caller has locked the hub device */ 1288f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 12897d069b7dSAlan Stern { 12907de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12917de18d8bSAlan Stern 1292f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 1293f07600cfSAlan Stern return 0; 12947d069b7dSAlan Stern } 12957d069b7dSAlan Stern 12961da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 12971da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 12981da177e4SLinus Torvalds { 1299b356b7c7SSarah Sharp struct usb_hcd *hcd; 13001da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 13011da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 13021da177e4SLinus Torvalds u16 hubstatus, hubchange; 130374ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 13041da177e4SLinus Torvalds unsigned int pipe; 1305fa2a9566SLan Tianyu int maxp, ret, i; 13067cbe5dcaSAlan Stern char *message = "out of memory"; 1307430ee58eSSebastian Andrzej Siewior unsigned unit_load; 1308430ee58eSSebastian Andrzej Siewior unsigned full_load; 13091da177e4SLinus Torvalds 1310d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 13111da177e4SLinus Torvalds if (!hub->buffer) { 13121da177e4SLinus Torvalds ret = -ENOMEM; 13131da177e4SLinus Torvalds goto fail; 13141da177e4SLinus Torvalds } 13151da177e4SLinus Torvalds 13161da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 13171da177e4SLinus Torvalds if (!hub->status) { 13181da177e4SLinus Torvalds ret = -ENOMEM; 13191da177e4SLinus Torvalds goto fail; 13201da177e4SLinus Torvalds } 1321db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 13221da177e4SLinus Torvalds 13231da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 13241da177e4SLinus Torvalds if (!hub->descriptor) { 13251da177e4SLinus Torvalds ret = -ENOMEM; 13261da177e4SLinus Torvalds goto fail; 13271da177e4SLinus Torvalds } 13281da177e4SLinus Torvalds 13291da177e4SLinus Torvalds /* Request the entire hub descriptor. 13301da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 13311da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 13321da177e4SLinus Torvalds */ 1333dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 13341da177e4SLinus Torvalds if (ret < 0) { 13351da177e4SLinus Torvalds message = "can't read hub descriptor"; 13361da177e4SLinus Torvalds goto fail; 13371da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 13381da177e4SLinus Torvalds message = "hub has too many ports!"; 13391da177e4SLinus Torvalds ret = -ENODEV; 13401da177e4SLinus Torvalds goto fail; 1341769d7368SDavid Linares } else if (hub->descriptor->bNbrPorts == 0) { 1342769d7368SDavid Linares message = "hub doesn't have any ports!"; 1343769d7368SDavid Linares ret = -ENODEV; 1344769d7368SDavid Linares goto fail; 13451da177e4SLinus Torvalds } 13461da177e4SLinus Torvalds 13471da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 13481da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 13491da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 13501da177e4SLinus Torvalds 1351fa2a9566SLan Tianyu hub->ports = kzalloc(hdev->maxchild * sizeof(struct usb_port *), 1352336c5c31SLan Tianyu GFP_KERNEL); 1353ff823c79SLan Tianyu if (!hub->ports) { 13547cbe5dcaSAlan Stern ret = -ENOMEM; 13557cbe5dcaSAlan Stern goto fail; 13567cbe5dcaSAlan Stern } 13577cbe5dcaSAlan Stern 135874ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 1359430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hdev)) { 1360430ee58eSSebastian Andrzej Siewior unit_load = 150; 1361430ee58eSSebastian Andrzej Siewior full_load = 900; 1362430ee58eSSebastian Andrzej Siewior } else { 1363430ee58eSSebastian Andrzej Siewior unit_load = 100; 1364430ee58eSSebastian Andrzej Siewior full_load = 500; 1365430ee58eSSebastian Andrzej Siewior } 13661da177e4SLinus Torvalds 1367dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1368dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1369dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 13701da177e4SLinus Torvalds int i; 13711da177e4SLinus Torvalds char portstr[USB_MAXCHILDREN + 1]; 13721da177e4SLinus Torvalds 13731da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 1374dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 13751da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 13761da177e4SLinus Torvalds ? 'F' : 'R'; 13771da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 13781da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 13791da177e4SLinus Torvalds } else 13801da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 13811da177e4SLinus Torvalds 138274ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 13837bf01185SAman Deep case HUB_CHAR_COMMON_LPSM: 13841da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 13851da177e4SLinus Torvalds break; 13867bf01185SAman Deep case HUB_CHAR_INDV_PORT_LPSM: 13871da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 13881da177e4SLinus Torvalds break; 13897bf01185SAman Deep case HUB_CHAR_NO_LPSM: 13907bf01185SAman Deep case HUB_CHAR_LPSM: 13911da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 13921da177e4SLinus Torvalds break; 13931da177e4SLinus Torvalds } 13941da177e4SLinus Torvalds 139574ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 13967bf01185SAman Deep case HUB_CHAR_COMMON_OCPM: 13971da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 13981da177e4SLinus Torvalds break; 13997bf01185SAman Deep case HUB_CHAR_INDV_PORT_OCPM: 14001da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 14011da177e4SLinus Torvalds break; 14027bf01185SAman Deep case HUB_CHAR_NO_OCPM: 14037bf01185SAman Deep case HUB_CHAR_OCPM: 14041da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 14051da177e4SLinus Torvalds break; 14061da177e4SLinus Torvalds } 14071da177e4SLinus Torvalds 14081da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 14091da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 1410cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 14111da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 14127bf01185SAman Deep case USB_HUB_PR_FS: 14131da177e4SLinus Torvalds break; 14147bf01185SAman Deep case USB_HUB_PR_HS_SINGLE_TT: 14151da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 14161da177e4SLinus Torvalds hub->tt.hub = hdev; 14171da177e4SLinus Torvalds break; 14187bf01185SAman Deep case USB_HUB_PR_HS_MULTI_TT: 14191da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 14201da177e4SLinus Torvalds if (ret == 0) { 14211da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 14221da177e4SLinus Torvalds hub->tt.multi = 1; 14231da177e4SLinus Torvalds } else 14241da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 14251da177e4SLinus Torvalds ret); 14261da177e4SLinus Torvalds hub->tt.hub = hdev; 14271da177e4SLinus Torvalds break; 14287bf01185SAman Deep case USB_HUB_PR_SS: 1429d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1430d2e9b4d6SSarah Sharp break; 14311da177e4SLinus Torvalds default: 14321da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 14331da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 14341da177e4SLinus Torvalds break; 14351da177e4SLinus Torvalds } 14361da177e4SLinus Torvalds 1437e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 143874ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1439e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1440e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1441e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1442e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1443e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1444e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1445e09711aeSdavid-b@pacbell.net } 14461da177e4SLinus Torvalds break; 1447e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1448e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1449e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1450e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1451e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 14521da177e4SLinus Torvalds break; 1453e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1454e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1455e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1456e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1457e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 14581da177e4SLinus Torvalds break; 1459e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1460e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1461e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1462e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1463e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 14641da177e4SLinus Torvalds break; 14651da177e4SLinus Torvalds } 14661da177e4SLinus Torvalds 14671da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 146874ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 14691da177e4SLinus Torvalds hub->has_indicators = 1; 14701da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 14711da177e4SLinus Torvalds } 14721da177e4SLinus Torvalds 14731da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 14741da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 14751da177e4SLinus Torvalds 14761da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 14771da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 14781da177e4SLinus Torvalds */ 14791da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 148015b7336eSAlan Stern if (ret) { 14811da177e4SLinus Torvalds message = "can't get hub status"; 14821da177e4SLinus Torvalds goto fail; 14831da177e4SLinus Torvalds } 1484430ee58eSSebastian Andrzej Siewior hcd = bus_to_hcd(hdev->bus); 14857d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 1486430ee58eSSebastian Andrzej Siewior if (hcd->power_budget > 0) 1487430ee58eSSebastian Andrzej Siewior hdev->bus_mA = hcd->power_budget; 1488430ee58eSSebastian Andrzej Siewior else 1489430ee58eSSebastian Andrzej Siewior hdev->bus_mA = full_load * hdev->maxchild; 1490430ee58eSSebastian Andrzej Siewior if (hdev->bus_mA >= full_load) 1491430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 149255c52718SAlan Stern else { 149355c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 149455c52718SAlan Stern hub->limited_power = 1; 149555c52718SAlan Stern } 14967d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 149755c52718SAlan Stern int remaining = hdev->bus_mA - 149855c52718SAlan Stern hub->descriptor->bHubContrCurrent; 14991da177e4SLinus Torvalds 1500430ee58eSSebastian Andrzej Siewior dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 1501430ee58eSSebastian Andrzej Siewior hub->descriptor->bHubContrCurrent); 1502430ee58eSSebastian Andrzej Siewior hub->limited_power = 1; 1503430ee58eSSebastian Andrzej Siewior 1504430ee58eSSebastian Andrzej Siewior if (remaining < hdev->maxchild * unit_load) 150555c52718SAlan Stern dev_warn(hub_dev, 150655c52718SAlan Stern "insufficient power available " 150755c52718SAlan Stern "to use all downstream ports\n"); 1508430ee58eSSebastian Andrzej Siewior hub->mA_per_port = unit_load; /* 7.2.1 */ 1509430ee58eSSebastian Andrzej Siewior 151055c52718SAlan Stern } else { /* Self-powered external hub */ 151155c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 151255c52718SAlan Stern * provide less current per port? */ 1513430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 151455c52718SAlan Stern } 1515430ee58eSSebastian Andrzej Siewior if (hub->mA_per_port < full_load) 151655c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 151755c52718SAlan Stern hub->mA_per_port); 15181da177e4SLinus Torvalds 1519b356b7c7SSarah Sharp /* Update the HCD's internal representation of this hub before khubd 1520b356b7c7SSarah Sharp * starts getting port status changes for devices under the hub. 1521b356b7c7SSarah Sharp */ 1522b356b7c7SSarah Sharp if (hcd->driver->update_hub_device) { 1523b356b7c7SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1524b356b7c7SSarah Sharp &hub->tt, GFP_KERNEL); 1525b356b7c7SSarah Sharp if (ret < 0) { 1526b356b7c7SSarah Sharp message = "can't update HCD hub info"; 1527b356b7c7SSarah Sharp goto fail; 1528b356b7c7SSarah Sharp } 1529b356b7c7SSarah Sharp } 1530b356b7c7SSarah Sharp 15311da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 15321da177e4SLinus Torvalds if (ret < 0) { 15331da177e4SLinus Torvalds message = "can't get hub status"; 15341da177e4SLinus Torvalds goto fail; 15351da177e4SLinus Torvalds } 15361da177e4SLinus Torvalds 15371da177e4SLinus Torvalds /* local power status reports aren't always correct */ 15381da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 15391da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 15401da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 15411da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 15421da177e4SLinus Torvalds 154374ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 15441da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 15451da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 15461da177e4SLinus Torvalds 154788fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 154888fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 154988fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 155088fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 155188fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 155288fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 15531da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 15541da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 15551da177e4SLinus Torvalds 15561da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 15571da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 15581da177e4SLinus Torvalds 15591da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 15601da177e4SLinus Torvalds if (!hub->urb) { 15611da177e4SLinus Torvalds ret = -ENOMEM; 15621da177e4SLinus Torvalds goto fail; 15631da177e4SLinus Torvalds } 15641da177e4SLinus Torvalds 15651da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 15661da177e4SLinus Torvalds hub, endpoint->bInterval); 15671da177e4SLinus Torvalds 15681da177e4SLinus Torvalds /* maybe cycle the hub leds */ 15691da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 15701da177e4SLinus Torvalds hub->indicator[0] = INDICATOR_CYCLE; 15711da177e4SLinus Torvalds 1572e58547ebSKrzysztof Mazur for (i = 0; i < hdev->maxchild; i++) { 1573e58547ebSKrzysztof Mazur ret = usb_hub_create_port_device(hub, i + 1); 1574e58547ebSKrzysztof Mazur if (ret < 0) { 1575fa2a9566SLan Tianyu dev_err(hub->intfdev, 1576fa2a9566SLan Tianyu "couldn't create port%d device.\n", i + 1); 1577e58547ebSKrzysztof Mazur hdev->maxchild = i; 1578e58547ebSKrzysztof Mazur goto fail_keep_maxchild; 1579e58547ebSKrzysztof Mazur } 1580e58547ebSKrzysztof Mazur } 1581fa2a9566SLan Tianyu 1582d2123fd9SLan Tianyu usb_hub_adjust_deviceremovable(hdev, hub->descriptor); 1583d2123fd9SLan Tianyu 1584f2835219SAlan Stern hub_activate(hub, HUB_INIT); 15851da177e4SLinus Torvalds return 0; 15861da177e4SLinus Torvalds 15871da177e4SLinus Torvalds fail: 1588d0308d4bSKrzysztof Mazur hdev->maxchild = 0; 1589e58547ebSKrzysztof Mazur fail_keep_maxchild: 15901da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 15911da177e4SLinus Torvalds message, ret); 15921da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 15931da177e4SLinus Torvalds return ret; 15941da177e4SLinus Torvalds } 15951da177e4SLinus Torvalds 1596e8054854SAlan Stern static void hub_release(struct kref *kref) 1597e8054854SAlan Stern { 1598e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1599e8054854SAlan Stern 1600e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1601e8054854SAlan Stern kfree(hub); 1602e8054854SAlan Stern } 1603e8054854SAlan Stern 16041da177e4SLinus Torvalds static unsigned highspeed_hubs; 16051da177e4SLinus Torvalds 16061da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 16071da177e4SLinus Torvalds { 16081da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 1609fa286188SGreg Kroah-Hartman struct usb_device *hdev = interface_to_usbdev(intf); 1610fa2a9566SLan Tianyu int i; 1611fa2a9566SLan Tianyu 1612e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 1613e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 16148e4ceb38SAlan Stern if (!list_empty(&hub->event_list)) { 1615e8054854SAlan Stern list_del_init(&hub->event_list); 16168e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 16178e4ceb38SAlan Stern } 1618e8054854SAlan Stern hub->disconnected = 1; 1619e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 16201da177e4SLinus Torvalds 16217de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 16227de18d8bSAlan Stern hub->error = 0; 16234330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 16247de18d8bSAlan Stern 16258b28c752SAlan Stern usb_set_intfdata (intf, NULL); 16261f2235b8SAlexander Shishkin 16271f2235b8SAlexander Shishkin for (i = 0; i < hdev->maxchild; i++) 16281f2235b8SAlexander Shishkin usb_hub_remove_port_device(hub, i + 1); 16297cbe5dcaSAlan Stern hub->hdev->maxchild = 0; 16301da177e4SLinus Torvalds 1631e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 16321da177e4SLinus Torvalds highspeed_hubs--; 16331da177e4SLinus Torvalds 16341da177e4SLinus Torvalds usb_free_urb(hub->urb); 1635fa2a9566SLan Tianyu kfree(hub->ports); 16361da177e4SLinus Torvalds kfree(hub->descriptor); 16371da177e4SLinus Torvalds kfree(hub->status); 1638d697cddaSAlan Stern kfree(hub->buffer); 16391da177e4SLinus Torvalds 1640971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, false); 1641e8054854SAlan Stern kref_put(&hub->kref, hub_release); 16421da177e4SLinus Torvalds } 16431da177e4SLinus Torvalds 16441da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 16451da177e4SLinus Torvalds { 16461da177e4SLinus Torvalds struct usb_host_interface *desc; 16471da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 16481da177e4SLinus Torvalds struct usb_device *hdev; 16491da177e4SLinus Torvalds struct usb_hub *hub; 16501da177e4SLinus Torvalds 16511da177e4SLinus Torvalds desc = intf->cur_altsetting; 16521da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 16531da177e4SLinus Torvalds 1654596d789aSMing Lei /* 1655596d789aSMing Lei * Set default autosuspend delay as 0 to speedup bus suspend, 1656596d789aSMing Lei * based on the below considerations: 1657596d789aSMing Lei * 1658596d789aSMing Lei * - Unlike other drivers, the hub driver does not rely on the 1659596d789aSMing Lei * autosuspend delay to provide enough time to handle a wakeup 1660596d789aSMing Lei * event, and the submitted status URB is just to check future 1661596d789aSMing Lei * change on hub downstream ports, so it is safe to do it. 1662596d789aSMing Lei * 1663596d789aSMing Lei * - The patch might cause one or more auto supend/resume for 1664596d789aSMing Lei * below very rare devices when they are plugged into hub 1665596d789aSMing Lei * first time: 1666596d789aSMing Lei * 1667596d789aSMing Lei * devices having trouble initializing, and disconnect 1668596d789aSMing Lei * themselves from the bus and then reconnect a second 1669596d789aSMing Lei * or so later 1670596d789aSMing Lei * 1671596d789aSMing Lei * devices just for downloading firmware, and disconnects 1672596d789aSMing Lei * themselves after completing it 1673596d789aSMing Lei * 1674596d789aSMing Lei * For these quite rare devices, their drivers may change the 1675596d789aSMing Lei * autosuspend delay of their parent hub in the probe() to one 1676596d789aSMing Lei * appropriate value to avoid the subtle problem if someone 1677596d789aSMing Lei * does care it. 1678596d789aSMing Lei * 1679596d789aSMing Lei * - The patch may cause one or more auto suspend/resume on 1680596d789aSMing Lei * hub during running 'lsusb', but it is probably too 1681596d789aSMing Lei * infrequent to worry about. 1682596d789aSMing Lei * 1683596d789aSMing Lei * - Change autosuspend delay of hub can avoid unnecessary auto 1684596d789aSMing Lei * suspend timer for hub, also may decrease power consumption 1685596d789aSMing Lei * of USB bus. 1686596d789aSMing Lei */ 1687596d789aSMing Lei pm_runtime_set_autosuspend_delay(&hdev->dev, 0); 1688596d789aSMing Lei 16892839f5bcSSarah Sharp /* Hubs have proper suspend/resume support. */ 1690088f7fecSAlan Stern usb_enable_autosuspend(hdev); 1691088f7fecSAlan Stern 169238f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1693b9cef6c3SWu Fengguang dev_err(&intf->dev, 1694b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 169538f3ad5eSFelipe Balbi return -E2BIG; 169638f3ad5eSFelipe Balbi } 169738f3ad5eSFelipe Balbi 169889ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 169989ccbdc9SDavid Brownell if (hdev->parent) { 170089ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 170189ccbdc9SDavid Brownell return -ENODEV; 170289ccbdc9SDavid Brownell } 170389ccbdc9SDavid Brownell #endif 170489ccbdc9SDavid Brownell 17051da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 17061da177e4SLinus Torvalds /* specs is not defined, but it works */ 17071da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 17081da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 17091da177e4SLinus Torvalds descriptor_error: 17101da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 17111da177e4SLinus Torvalds return -EIO; 17121da177e4SLinus Torvalds } 17131da177e4SLinus Torvalds 17141da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 17151da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 17161da177e4SLinus Torvalds goto descriptor_error; 17171da177e4SLinus Torvalds 17181da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 17191da177e4SLinus Torvalds 1720fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1721fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 17221da177e4SLinus Torvalds goto descriptor_error; 17231da177e4SLinus Torvalds 17241da177e4SLinus Torvalds /* We found a hub */ 17251da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 17261da177e4SLinus Torvalds 17270a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 17281da177e4SLinus Torvalds if (!hub) { 17291da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 17301da177e4SLinus Torvalds return -ENOMEM; 17311da177e4SLinus Torvalds } 17321da177e4SLinus Torvalds 1733e8054854SAlan Stern kref_init(&hub->kref); 17341da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 17351da177e4SLinus Torvalds hub->intfdev = &intf->dev; 17361da177e4SLinus Torvalds hub->hdev = hdev; 1737c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 17388520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 1739e8054854SAlan Stern usb_get_intf(intf); 17401da177e4SLinus Torvalds 17411da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 174240f122f3SAlan Stern intf->needs_remote_wakeup = 1; 1743971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, true); 17441da177e4SLinus Torvalds 17451da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 17461da177e4SLinus Torvalds highspeed_hubs++; 17471da177e4SLinus Torvalds 1748e6f30deaSMing Lei if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) 1749e6f30deaSMing Lei hub->quirk_check_port_auto_suspend = 1; 1750e6f30deaSMing Lei 17511da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 17521da177e4SLinus Torvalds return 0; 17531da177e4SLinus Torvalds 17541da177e4SLinus Torvalds hub_disconnect (intf); 17551da177e4SLinus Torvalds return -ENODEV; 17561da177e4SLinus Torvalds } 17571da177e4SLinus Torvalds 17581da177e4SLinus Torvalds static int 17591da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 17601da177e4SLinus Torvalds { 17611da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 1762ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 17631da177e4SLinus Torvalds 17641da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 17651da177e4SLinus Torvalds switch (code) { 17661da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 17671da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 17681da177e4SLinus Torvalds int i; 17691da177e4SLinus Torvalds 17701da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 17711da177e4SLinus Torvalds if (hdev->devnum <= 0) 17721da177e4SLinus Torvalds info->nports = 0; 17731da177e4SLinus Torvalds else { 17741da177e4SLinus Torvalds info->nports = hdev->maxchild; 17751da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 1776ff823c79SLan Tianyu if (hub->ports[i]->child == NULL) 17771da177e4SLinus Torvalds info->port[i] = 0; 17781da177e4SLinus Torvalds else 17791da177e4SLinus Torvalds info->port[i] = 1780ff823c79SLan Tianyu hub->ports[i]->child->devnum; 17811da177e4SLinus Torvalds } 17821da177e4SLinus Torvalds } 17831da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds return info->nports + 1; 17861da177e4SLinus Torvalds } 17871da177e4SLinus Torvalds 17881da177e4SLinus Torvalds default: 17891da177e4SLinus Torvalds return -ENOSYS; 17901da177e4SLinus Torvalds } 17911da177e4SLinus Torvalds } 17921da177e4SLinus Torvalds 17937cbe5dcaSAlan Stern /* 17947cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 17957cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 17967cbe5dcaSAlan Stern */ 17977cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 1798336c5c31SLan Tianyu struct dev_state ***ppowner) 17997cbe5dcaSAlan Stern { 180041341261SMathias Nyman struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 180141341261SMathias Nyman 18027cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 18037cbe5dcaSAlan Stern return -ENODEV; 18047cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 18057cbe5dcaSAlan Stern return -EINVAL; 18067cbe5dcaSAlan Stern 180741341261SMathias Nyman /* Devices not managed by the hub driver 18087cbe5dcaSAlan Stern * will always have maxchild equal to 0. 18097cbe5dcaSAlan Stern */ 181041341261SMathias Nyman *ppowner = &(hub->ports[port1 - 1]->port_owner); 18117cbe5dcaSAlan Stern return 0; 18127cbe5dcaSAlan Stern } 18137cbe5dcaSAlan Stern 18147cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 1815336c5c31SLan Tianyu int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, 1816336c5c31SLan Tianyu struct dev_state *owner) 18177cbe5dcaSAlan Stern { 18187cbe5dcaSAlan Stern int rc; 1819336c5c31SLan Tianyu struct dev_state **powner; 18207cbe5dcaSAlan Stern 18217cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18227cbe5dcaSAlan Stern if (rc) 18237cbe5dcaSAlan Stern return rc; 18247cbe5dcaSAlan Stern if (*powner) 18257cbe5dcaSAlan Stern return -EBUSY; 18267cbe5dcaSAlan Stern *powner = owner; 18277cbe5dcaSAlan Stern return rc; 18287cbe5dcaSAlan Stern } 18297cbe5dcaSAlan Stern 1830336c5c31SLan Tianyu int usb_hub_release_port(struct usb_device *hdev, unsigned port1, 1831336c5c31SLan Tianyu struct dev_state *owner) 18327cbe5dcaSAlan Stern { 18337cbe5dcaSAlan Stern int rc; 1834336c5c31SLan Tianyu struct dev_state **powner; 18357cbe5dcaSAlan Stern 18367cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18377cbe5dcaSAlan Stern if (rc) 18387cbe5dcaSAlan Stern return rc; 18397cbe5dcaSAlan Stern if (*powner != owner) 18407cbe5dcaSAlan Stern return -ENOENT; 18417cbe5dcaSAlan Stern *powner = NULL; 18427cbe5dcaSAlan Stern return rc; 18437cbe5dcaSAlan Stern } 18447cbe5dcaSAlan Stern 1845336c5c31SLan Tianyu void usb_hub_release_all_ports(struct usb_device *hdev, struct dev_state *owner) 18467cbe5dcaSAlan Stern { 1847ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 18487cbe5dcaSAlan Stern int n; 18497cbe5dcaSAlan Stern 1850fa2a9566SLan Tianyu for (n = 0; n < hdev->maxchild; n++) { 1851fa2a9566SLan Tianyu if (hub->ports[n]->port_owner == owner) 1852fa2a9566SLan Tianyu hub->ports[n]->port_owner = NULL; 18537cbe5dcaSAlan Stern } 1854fa2a9566SLan Tianyu 18557cbe5dcaSAlan Stern } 18567cbe5dcaSAlan Stern 18577cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 18587cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 18597cbe5dcaSAlan Stern { 18607cbe5dcaSAlan Stern struct usb_hub *hub; 18617cbe5dcaSAlan Stern 18627cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 18637cbe5dcaSAlan Stern return false; 1864ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 1865fa2a9566SLan Tianyu return !!hub->ports[udev->portnum - 1]->port_owner; 18667cbe5dcaSAlan Stern } 18677cbe5dcaSAlan Stern 18681da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 18691da177e4SLinus Torvalds { 1870ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 18711da177e4SLinus Torvalds int i; 18721da177e4SLinus Torvalds 18731da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 1874ff823c79SLan Tianyu if (hub->ports[i]->child) 1875ff823c79SLan Tianyu recursively_mark_NOTATTACHED(hub->ports[i]->child); 18761da177e4SLinus Torvalds } 18779bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 187815123006SSarah Sharp udev->active_duration -= jiffies; 18791da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 18801da177e4SLinus Torvalds } 18811da177e4SLinus Torvalds 18821da177e4SLinus Torvalds /** 18831da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 18841da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 18851da177e4SLinus Torvalds * @new_state: new state value to be stored 18861da177e4SLinus Torvalds * 18871da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 18881da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 18891da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 18901da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 18911da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 18921da177e4SLinus Torvalds * all changes to any device's state must be protected by the 18931da177e4SLinus Torvalds * device_state_lock spinlock. 18941da177e4SLinus Torvalds * 18951da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 18961da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 18971da177e4SLinus Torvalds * 18981da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 18991da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 19001da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 19011da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 19021da177e4SLinus Torvalds */ 19031da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 19041da177e4SLinus Torvalds enum usb_device_state new_state) 19051da177e4SLinus Torvalds { 19061da177e4SLinus Torvalds unsigned long flags; 19074681b171SRafael J. Wysocki int wakeup = -1; 19081da177e4SLinus Torvalds 19091da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 19101da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 19111da177e4SLinus Torvalds ; /* do nothing */ 1912b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1913fb669cc0SDavid Brownell 1914fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1915fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1916fb669cc0SDavid Brownell */ 1917fb669cc0SDavid Brownell if (udev->parent) { 1918645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1919645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1920645daaabSAlan Stern ; /* No change to wakeup settings */ 1921645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 19224681b171SRafael J. Wysocki wakeup = udev->actconfig->desc.bmAttributes 19234681b171SRafael J. Wysocki & USB_CONFIG_ATT_WAKEUP; 1924645daaabSAlan Stern else 19254681b171SRafael J. Wysocki wakeup = 0; 1926fb669cc0SDavid Brownell } 192715123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 192815123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 192915123006SSarah Sharp udev->active_duration -= jiffies; 193015123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 193115123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 193215123006SSarah Sharp udev->active_duration += jiffies; 1933645daaabSAlan Stern udev->state = new_state; 1934b94dc6b5SDavid Brownell } else 19351da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 19361da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 19374681b171SRafael J. Wysocki if (wakeup >= 0) 19384681b171SRafael J. Wysocki device_set_wakeup_capable(&udev->dev, wakeup); 19391da177e4SLinus Torvalds } 19406da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 19411da177e4SLinus Torvalds 19428af548dcSInaky Perez-Gonzalez /* 19433b29b68bSAlan Stern * Choose a device number. 19443b29b68bSAlan Stern * 19453b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 19463b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 19473b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 19483b29b68bSAlan Stern * and it usually is not the same as the device number. 19493b29b68bSAlan Stern * 19508af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 19518af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 19528af548dcSInaky Perez-Gonzalez * life of the device connection logic in 19538af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 19548af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 19558af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 19568af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 19578af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 19588af548dcSInaky Perez-Gonzalez * [X | 0x80]. 19598af548dcSInaky Perez-Gonzalez * 19608af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 19618af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 19628af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 19638af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 19648af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 1965c6515272SSarah Sharp * 1966c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 1967c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 1968c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 1969c6515272SSarah Sharp * command to the hardware. 19708af548dcSInaky Perez-Gonzalez */ 19713b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 19721da177e4SLinus Torvalds { 19731da177e4SLinus Torvalds int devnum; 19741da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 19751da177e4SLinus Torvalds 19761da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 19778af548dcSInaky Perez-Gonzalez if (udev->wusb) { 19788af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 19798af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 19808af548dcSInaky Perez-Gonzalez } else { 19818af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 19828af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 19831da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 19841da177e4SLinus Torvalds bus->devnum_next); 19851da177e4SLinus Torvalds if (devnum >= 128) 19868af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 19878af548dcSInaky Perez-Gonzalez 128, 1); 19881da177e4SLinus Torvalds bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); 19898af548dcSInaky Perez-Gonzalez } 19901da177e4SLinus Torvalds if (devnum < 128) { 19911da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 19921da177e4SLinus Torvalds udev->devnum = devnum; 19931da177e4SLinus Torvalds } 19941da177e4SLinus Torvalds } 19951da177e4SLinus Torvalds 19963b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 19971da177e4SLinus Torvalds { 19981da177e4SLinus Torvalds if (udev->devnum > 0) { 19991da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 20001da177e4SLinus Torvalds udev->devnum = -1; 20011da177e4SLinus Torvalds } 20021da177e4SLinus Torvalds } 20031da177e4SLinus Torvalds 20043b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 20054953d141SDavid Vrabel { 20064953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 20074953d141SDavid Vrabel if (!udev->wusb) 20084953d141SDavid Vrabel udev->devnum = devnum; 20094953d141SDavid Vrabel } 20104953d141SDavid Vrabel 2011f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 2012f7410cedSHerbert Xu { 2013f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2014f7410cedSHerbert Xu 2015f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 2016f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 2017f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 2018f7410cedSHerbert Xu } 2019f7410cedSHerbert Xu 20201da177e4SLinus Torvalds /** 20211da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 20221da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 20231da177e4SLinus Torvalds * Context: !in_interrupt () 20241da177e4SLinus Torvalds * 20251da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 20261da177e4SLinus Torvalds * 20271da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 2028db8f2aa3SBjorn Helgaas * If *pdev is a root hub then the caller must hold the usb_bus_list_lock, 2029db8f2aa3SBjorn Helgaas * which protects the set of root hubs as well as the list of buses. 20301da177e4SLinus Torvalds * 20311da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 20321da177e4SLinus Torvalds * controllers) should ever call this. 20331da177e4SLinus Torvalds * 20341da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 20351da177e4SLinus Torvalds */ 20361da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 20371da177e4SLinus Torvalds { 20381da177e4SLinus Torvalds struct usb_device *udev = *pdev; 2039ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 20401da177e4SLinus Torvalds int i; 20411da177e4SLinus Torvalds 20421da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 20431da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 204425985edcSLucas De Marchi * this quiesces everything except pending urbs. 20451da177e4SLinus Torvalds */ 20461da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 20473b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 20483b29b68bSAlan Stern udev->devnum); 20491da177e4SLinus Torvalds 20509ad3d6ccSAlan Stern usb_lock_device(udev); 20519ad3d6ccSAlan Stern 20521da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 20538816230eSHuajun Li for (i = 0; i < udev->maxchild; i++) { 2054ff823c79SLan Tianyu if (hub->ports[i]->child) 2055ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 20561da177e4SLinus Torvalds } 20571da177e4SLinus Torvalds 20581da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 20591da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 20601da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 20611da177e4SLinus Torvalds */ 2062782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 20631da177e4SLinus Torvalds usb_disable_device(udev, 0); 2064cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 20651da177e4SLinus Torvalds 2066fde26380SLan Tianyu if (udev->parent) { 2067ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2068ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2069fde26380SLan Tianyu 2070fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2071fde26380SLan Tianyu sysfs_remove_link(&port_dev->dev.kobj, "device"); 2072971fcd49SLan Tianyu 2073ad493e5eSLan Tianyu if (!port_dev->did_runtime_put) 2074971fcd49SLan Tianyu pm_runtime_put(&port_dev->dev); 2075ad493e5eSLan Tianyu else 2076ad493e5eSLan Tianyu port_dev->did_runtime_put = false; 2077fde26380SLan Tianyu } 2078fde26380SLan Tianyu 20793b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 2080782da727SAlan Stern usb_unlock_device(udev); 20813099e75aSGreg Kroah-Hartman 2082782da727SAlan Stern /* Unregister the device. The device driver is responsible 20833b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 20843b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2085782da727SAlan Stern */ 2086782da727SAlan Stern device_del(&udev->dev); 2087782da727SAlan Stern 2088782da727SAlan Stern /* Free the device number and delete the parent's children[] 20891da177e4SLinus Torvalds * (or root_hub) pointer. 20901da177e4SLinus Torvalds */ 20913b29b68bSAlan Stern release_devnum(udev); 20921da177e4SLinus Torvalds 20931da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 20941da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 20951da177e4SLinus Torvalds *pdev = NULL; 20961da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 20971da177e4SLinus Torvalds 2098f7410cedSHerbert Xu hub_free_dev(udev); 2099f7410cedSHerbert Xu 2100782da727SAlan Stern put_device(&udev->dev); 21011da177e4SLinus Torvalds } 21021da177e4SLinus Torvalds 2103f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 21041da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 21051da177e4SLinus Torvalds { 21061da177e4SLinus Torvalds if (!string) 21071da177e4SLinus Torvalds return; 2108f2ec522eSJoe Perches dev_info(&udev->dev, "%s: %s\n", id, string); 21091da177e4SLinus Torvalds } 21101da177e4SLinus Torvalds 2111f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 2112f2a383e4SGreg Kroah-Hartman { 2113f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 2114f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 2115f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 2116b9cef6c3SWu Fengguang dev_info(&udev->dev, 2117b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 2118f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 2119f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 2120f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 2121f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 2122f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 2123f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 2124f2a383e4SGreg Kroah-Hartman } 21251da177e4SLinus Torvalds #else 2126f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 21271da177e4SLinus Torvalds #endif 21281da177e4SLinus Torvalds 21291da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 21301da177e4SLinus Torvalds #include "otg_whitelist.h" 21311da177e4SLinus Torvalds #endif 21321da177e4SLinus Torvalds 21333ede760fSOliver Neukum /** 21348d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 21353ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 21363ede760fSOliver Neukum * 21378d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 2138626f090cSYacine Belkadi * 2139626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 21403ede760fSOliver Neukum */ 21418d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 21421da177e4SLinus Torvalds { 2143d9d16e8aSInaky Perez-Gonzalez int err = 0; 21441da177e4SLinus Torvalds 21451da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 21461da177e4SLinus Torvalds /* 21471da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 21481da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 21491da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 21501da177e4SLinus Torvalds */ 21511da177e4SLinus Torvalds if (!udev->bus->is_b_host 21521da177e4SLinus Torvalds && udev->config 21531da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 21542eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 21551da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 21561da177e4SLinus Torvalds 21571da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 21581da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 21591da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 21601da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 21611da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 216212c3da34SAlan Stern unsigned port1 = udev->portnum; 21631da177e4SLinus Torvalds 21641da177e4SLinus Torvalds dev_info(&udev->dev, 21651da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 21661da177e4SLinus Torvalds (port1 == bus->otg_port) 21671da177e4SLinus Torvalds ? "" : "non-"); 21681da177e4SLinus Torvalds 21691da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 21701da177e4SLinus Torvalds if (port1 == bus->otg_port) 21711da177e4SLinus Torvalds bus->b_hnp_enable = 1; 21721da177e4SLinus Torvalds err = usb_control_msg(udev, 21731da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 21741da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 21751da177e4SLinus Torvalds bus->b_hnp_enable 21761da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 21771da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 21781da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 21791da177e4SLinus Torvalds if (err < 0) { 21801da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 21811da177e4SLinus Torvalds * customize to match your product. 21821da177e4SLinus Torvalds */ 21831da177e4SLinus Torvalds dev_info(&udev->dev, 2184b9cef6c3SWu Fengguang "can't set HNP mode: %d\n", 21851da177e4SLinus Torvalds err); 21861da177e4SLinus Torvalds bus->b_hnp_enable = 0; 21871da177e4SLinus Torvalds } 21881da177e4SLinus Torvalds } 21891da177e4SLinus Torvalds } 21901da177e4SLinus Torvalds } 21911da177e4SLinus Torvalds 21921da177e4SLinus Torvalds if (!is_targeted(udev)) { 21931da177e4SLinus Torvalds 21941da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 21951da177e4SLinus Torvalds * (Includes HNP test device.) 21961da177e4SLinus Torvalds */ 21971da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 2198634a84f8SDavid Brownell err = usb_port_suspend(udev, PMSG_SUSPEND); 21991da177e4SLinus Torvalds if (err < 0) 22001da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 22011da177e4SLinus Torvalds } 2202ffcdc18dSVikram Pandita err = -ENOTSUPP; 22031da177e4SLinus Torvalds goto fail; 22041da177e4SLinus Torvalds } 2205d9d16e8aSInaky Perez-Gonzalez fail: 22061da177e4SLinus Torvalds #endif 2207d9d16e8aSInaky Perez-Gonzalez return err; 2208d9d16e8aSInaky Perez-Gonzalez } 22091da177e4SLinus Torvalds 2210d9d16e8aSInaky Perez-Gonzalez 2211d9d16e8aSInaky Perez-Gonzalez /** 22128d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 2213d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2214d9d16e8aSInaky Perez-Gonzalez * 2215d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 2216d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 2217d9d16e8aSInaky Perez-Gonzalez * environment. 2218d9d16e8aSInaky Perez-Gonzalez * 2219d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 2220d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 2221d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 2222626f090cSYacine Belkadi * 2223626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 2224d9d16e8aSInaky Perez-Gonzalez */ 22258d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 2226d9d16e8aSInaky Perez-Gonzalez { 2227d9d16e8aSInaky Perez-Gonzalez int err; 2228d9d16e8aSInaky Perez-Gonzalez 2229d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 2230d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 2231d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 2232e9e88fb7SAlan Stern if (err != -ENODEV) 2233d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 2234d9d16e8aSInaky Perez-Gonzalez err); 223580da2e0dSLaurent Pinchart return err; 2236d9d16e8aSInaky Perez-Gonzalez } 2237d9d16e8aSInaky Perez-Gonzalez } 2238d9d16e8aSInaky Perez-Gonzalez if (udev->wusb == 1 && udev->authorized == 0) { 2239d9d16e8aSInaky Perez-Gonzalez udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2240d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2241d9d16e8aSInaky Perez-Gonzalez udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2242469271f8SMatthias Beyer } else { 2243d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 2244d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 2245d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 2246d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 2247d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 2248d9d16e8aSInaky Perez-Gonzalez } 22498d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 225080da2e0dSLaurent Pinchart if (err < 0) 2251d9d16e8aSInaky Perez-Gonzalez return err; 225280da2e0dSLaurent Pinchart 225380da2e0dSLaurent Pinchart usb_detect_interface_quirks(udev); 225480da2e0dSLaurent Pinchart 225580da2e0dSLaurent Pinchart return 0; 2256d9d16e8aSInaky Perez-Gonzalez } 2257d9d16e8aSInaky Perez-Gonzalez 2258d35e70d5SMatthew Garrett static void set_usb_port_removable(struct usb_device *udev) 2259d35e70d5SMatthew Garrett { 2260d35e70d5SMatthew Garrett struct usb_device *hdev = udev->parent; 2261d35e70d5SMatthew Garrett struct usb_hub *hub; 2262d35e70d5SMatthew Garrett u8 port = udev->portnum; 2263d35e70d5SMatthew Garrett u16 wHubCharacteristics; 2264d35e70d5SMatthew Garrett bool removable = true; 2265d35e70d5SMatthew Garrett 2266d35e70d5SMatthew Garrett if (!hdev) 2267d35e70d5SMatthew Garrett return; 2268d35e70d5SMatthew Garrett 2269ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 2270d35e70d5SMatthew Garrett 2271d35e70d5SMatthew Garrett wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 2272d35e70d5SMatthew Garrett 2273d35e70d5SMatthew Garrett if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) 2274d35e70d5SMatthew Garrett return; 2275d35e70d5SMatthew Garrett 2276d35e70d5SMatthew Garrett if (hub_is_superspeed(hdev)) { 2277ca3c1539SLan Tianyu if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) 2278ca3c1539SLan Tianyu & (1 << port)) 2279d35e70d5SMatthew Garrett removable = false; 2280d35e70d5SMatthew Garrett } else { 2281d35e70d5SMatthew Garrett if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) 2282d35e70d5SMatthew Garrett removable = false; 2283d35e70d5SMatthew Garrett } 2284d35e70d5SMatthew Garrett 2285d35e70d5SMatthew Garrett if (removable) 2286d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 2287d35e70d5SMatthew Garrett else 2288d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 2289d35e70d5SMatthew Garrett } 2290d9d16e8aSInaky Perez-Gonzalez 2291d9d16e8aSInaky Perez-Gonzalez /** 2292d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 2293d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2294d9d16e8aSInaky Perez-Gonzalez * 22958d8558d1SAlan Stern * This is called with devices which have been detected but not fully 22968d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 2297d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 2298d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 2299d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 2300d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 2301d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 2302d9d16e8aSInaky Perez-Gonzalez * 2303d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 2304d9d16e8aSInaky Perez-Gonzalez * 2305d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 2306626f090cSYacine Belkadi * 2307626f090cSYacine Belkadi * Return: Whether the device is configured properly or not. Zero if the 2308626f090cSYacine Belkadi * interface was registered with the driver core; else a negative errno 2309626f090cSYacine Belkadi * value. 2310626f090cSYacine Belkadi * 2311d9d16e8aSInaky Perez-Gonzalez */ 2312d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 2313d9d16e8aSInaky Perez-Gonzalez { 2314d9d16e8aSInaky Perez-Gonzalez int err; 2315d9d16e8aSInaky Perez-Gonzalez 231616985408SDan Streetman if (udev->parent) { 231716985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 231816985408SDan Streetman * device (un)configuration controls wakeup capable 231916985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 232016985408SDan Streetman */ 232116985408SDan Streetman device_init_wakeup(&udev->dev, 0); 232216985408SDan Streetman } 232316985408SDan Streetman 23249bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 23259bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 2326c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 2327fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 23289bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 23299bbdf1e0SAlan Stern 2330c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 2331c08512c7SAlan Stern * allowed for hubs during binding. 2332c08512c7SAlan Stern */ 2333c08512c7SAlan Stern usb_disable_autosuspend(udev); 2334c08512c7SAlan Stern 23358d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 2336d9d16e8aSInaky Perez-Gonzalez if (err < 0) 2337d9d16e8aSInaky Perez-Gonzalez goto fail; 2338c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 2339c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 2340c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 23419f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 23429f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 23439f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 23449f8b17e6SKay Sievers 23456cd13201SAlan Stern /* Tell the world! */ 23466cd13201SAlan Stern announce_device(udev); 2347195af2ccSAlan Stern 2348b04b3156STheodore Ts'o if (udev->serial) 2349b04b3156STheodore Ts'o add_device_randomness(udev->serial, strlen(udev->serial)); 2350b04b3156STheodore Ts'o if (udev->product) 2351b04b3156STheodore Ts'o add_device_randomness(udev->product, strlen(udev->product)); 2352b04b3156STheodore Ts'o if (udev->manufacturer) 2353b04b3156STheodore Ts'o add_device_randomness(udev->manufacturer, 2354b04b3156STheodore Ts'o strlen(udev->manufacturer)); 2355b04b3156STheodore Ts'o 2356927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 2357d35e70d5SMatthew Garrett 2358d35e70d5SMatthew Garrett /* 2359d35e70d5SMatthew Garrett * check whether the hub marks this port as non-removable. Do it 2360d35e70d5SMatthew Garrett * now so that platform-specific data can override it in 2361d35e70d5SMatthew Garrett * device_add() 2362d35e70d5SMatthew Garrett */ 2363d35e70d5SMatthew Garrett if (udev->parent) 2364d35e70d5SMatthew Garrett set_usb_port_removable(udev); 2365d35e70d5SMatthew Garrett 2366782da727SAlan Stern /* Register the device. The device driver is responsible 23673b23dd6fSAlan Stern * for configuring the device and invoking the add-device 23683b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2369782da727SAlan Stern */ 23701da177e4SLinus Torvalds err = device_add(&udev->dev); 23711da177e4SLinus Torvalds if (err) { 23721da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 23731da177e4SLinus Torvalds goto fail; 23741da177e4SLinus Torvalds } 23759ad3d6ccSAlan Stern 2376fde26380SLan Tianyu /* Create link files between child device and usb port device. */ 2377fde26380SLan Tianyu if (udev->parent) { 2378ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2379ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2380fde26380SLan Tianyu 2381fde26380SLan Tianyu err = sysfs_create_link(&udev->dev.kobj, 2382fde26380SLan Tianyu &port_dev->dev.kobj, "port"); 2383fde26380SLan Tianyu if (err) 2384fde26380SLan Tianyu goto fail; 2385fde26380SLan Tianyu 2386fde26380SLan Tianyu err = sysfs_create_link(&port_dev->dev.kobj, 2387fde26380SLan Tianyu &udev->dev.kobj, "device"); 2388fde26380SLan Tianyu if (err) { 2389fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2390fde26380SLan Tianyu goto fail; 2391fde26380SLan Tianyu } 2392971fcd49SLan Tianyu 2393971fcd49SLan Tianyu pm_runtime_get_sync(&port_dev->dev); 2394fde26380SLan Tianyu } 2395fde26380SLan Tianyu 23963b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 2397c08512c7SAlan Stern usb_mark_last_busy(udev); 2398c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 2399c066475eSGreg Kroah-Hartman return err; 24001da177e4SLinus Torvalds 24011da177e4SLinus Torvalds fail: 24021da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 24039bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 24049bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 2405d9d16e8aSInaky Perez-Gonzalez return err; 24061da177e4SLinus Torvalds } 24071da177e4SLinus Torvalds 240893993a0aSInaky Perez-Gonzalez 240993993a0aSInaky Perez-Gonzalez /** 2410fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 2411fd39c86bSRandy Dunlap * @usb_dev: USB device 2412fd39c86bSRandy Dunlap * 2413fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 2414fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 241593993a0aSInaky Perez-Gonzalez * 241693993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 241793993a0aSInaky Perez-Gonzalez * defer its call. 2418626f090cSYacine Belkadi * 2419626f090cSYacine Belkadi * Return: 0. 242093993a0aSInaky Perez-Gonzalez */ 242193993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 242293993a0aSInaky Perez-Gonzalez { 242393993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 242493993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 242593993a0aSInaky Perez-Gonzalez goto out_unauthorized; 2426da307123SAlan Stern 242793993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 242893993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 2429da307123SAlan Stern 2430da307123SAlan Stern kfree(usb_dev->product); 243193993a0aSInaky Perez-Gonzalez usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2432da307123SAlan Stern kfree(usb_dev->manufacturer); 243393993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2434da307123SAlan Stern kfree(usb_dev->serial); 243593993a0aSInaky Perez-Gonzalez usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2436da307123SAlan Stern 2437da307123SAlan Stern usb_destroy_configuration(usb_dev); 243893993a0aSInaky Perez-Gonzalez usb_dev->descriptor.bNumConfigurations = 0; 2439da307123SAlan Stern 244093993a0aSInaky Perez-Gonzalez out_unauthorized: 244193993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 244293993a0aSInaky Perez-Gonzalez return 0; 244393993a0aSInaky Perez-Gonzalez } 244493993a0aSInaky Perez-Gonzalez 244593993a0aSInaky Perez-Gonzalez 244693993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 244793993a0aSInaky Perez-Gonzalez { 244893993a0aSInaky Perez-Gonzalez int result = 0, c; 2449da307123SAlan Stern 245093993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 245193993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 245293993a0aSInaky Perez-Gonzalez goto out_authorized; 2453da307123SAlan Stern 245493993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 245593993a0aSInaky Perez-Gonzalez if (result < 0) { 245693993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 245793993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 245893993a0aSInaky Perez-Gonzalez goto error_autoresume; 245993993a0aSInaky Perez-Gonzalez } 246093993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 246193993a0aSInaky Perez-Gonzalez if (result < 0) { 246293993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 246393993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 246493993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 246593993a0aSInaky Perez-Gonzalez } 2466da307123SAlan Stern 2467da307123SAlan Stern kfree(usb_dev->product); 2468da307123SAlan Stern usb_dev->product = NULL; 2469da307123SAlan Stern kfree(usb_dev->manufacturer); 2470da307123SAlan Stern usb_dev->manufacturer = NULL; 2471da307123SAlan Stern kfree(usb_dev->serial); 2472da307123SAlan Stern usb_dev->serial = NULL; 2473da307123SAlan Stern 247493993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 24758d8558d1SAlan Stern result = usb_enumerate_device(usb_dev); 247693993a0aSInaky Perez-Gonzalez if (result < 0) 24778d8558d1SAlan Stern goto error_enumerate; 247893993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 247993993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 248093993a0aSInaky Perez-Gonzalez */ 2481b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 248293993a0aSInaky Perez-Gonzalez if (c >= 0) { 248393993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 248493993a0aSInaky Perez-Gonzalez if (result) { 248593993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 248693993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 248793993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 248893993a0aSInaky Perez-Gonzalez * set other configurations. */ 248993993a0aSInaky Perez-Gonzalez } 249093993a0aSInaky Perez-Gonzalez } 249193993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2492da307123SAlan Stern 24938d8558d1SAlan Stern error_enumerate: 249493993a0aSInaky Perez-Gonzalez error_device_descriptor: 2495da307123SAlan Stern usb_autosuspend_device(usb_dev); 249693993a0aSInaky Perez-Gonzalez error_autoresume: 249793993a0aSInaky Perez-Gonzalez out_authorized: 2498781b2137SMatthias Beyer usb_unlock_device(usb_dev); /* complements locktree */ 249993993a0aSInaky Perez-Gonzalez return result; 250093993a0aSInaky Perez-Gonzalez } 250193993a0aSInaky Perez-Gonzalez 250293993a0aSInaky Perez-Gonzalez 25030165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 25040165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 25050165de09SInaky Perez-Gonzalez { 25060165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 25070165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 25080165de09SInaky Perez-Gonzalez return 0; 25090165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 25100165de09SInaky Perez-Gonzalez return hcd->wireless; 25110165de09SInaky Perez-Gonzalez } 25120165de09SInaky Perez-Gonzalez 25130165de09SInaky Perez-Gonzalez 25141da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 25151da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 25161da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 25171da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 251890ab5ee9SRusty Russell #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) 25191da177e4SLinus Torvalds 25201da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 25211da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 252275d7cf72SAndiry Xu #define HUB_BH_RESET_TIME 50 25231da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 252477c7f072SSarah Sharp #define HUB_RESET_TIMEOUT 800 25251da177e4SLinus Torvalds 252610d674a8SSarah Sharp static int hub_port_reset(struct usb_hub *hub, int port1, 252710d674a8SSarah Sharp struct usb_device *udev, unsigned int delay, bool warm); 252810d674a8SSarah Sharp 25298bea2bd3SStanislaw Ledwon /* Is a USB 3.0 port in the Inactive or Complinance Mode state? 25308bea2bd3SStanislaw Ledwon * Port worm reset is required to recover 25318bea2bd3SStanislaw Ledwon */ 25328bea2bd3SStanislaw Ledwon static bool hub_port_warm_reset_required(struct usb_hub *hub, u16 portstatus) 253310d674a8SSarah Sharp { 253410d674a8SSarah Sharp return hub_is_superspeed(hub->hdev) && 25358bea2bd3SStanislaw Ledwon (((portstatus & USB_PORT_STAT_LINK_STATE) == 25368bea2bd3SStanislaw Ledwon USB_SS_PORT_LS_SS_INACTIVE) || 25378bea2bd3SStanislaw Ledwon ((portstatus & USB_PORT_STAT_LINK_STATE) == 25388bea2bd3SStanislaw Ledwon USB_SS_PORT_LS_COMP_MOD)) ; 253910d674a8SSarah Sharp } 254010d674a8SSarah Sharp 25411da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 254275d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 25431da177e4SLinus Torvalds { 25441da177e4SLinus Torvalds int delay_time, ret; 25451da177e4SLinus Torvalds u16 portstatus; 25461da177e4SLinus Torvalds u16 portchange; 25471da177e4SLinus Torvalds 25481da177e4SLinus Torvalds for (delay_time = 0; 25491da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 25501da177e4SLinus Torvalds delay_time += delay) { 25511da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 25521da177e4SLinus Torvalds msleep(delay); 25531da177e4SLinus Torvalds 25541da177e4SLinus Torvalds /* read and decode port status */ 25551da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 25561da177e4SLinus Torvalds if (ret < 0) 25571da177e4SLinus Torvalds return ret; 25581da177e4SLinus Torvalds 25594f43447eSSarah Sharp /* The port state is unknown until the reset completes. */ 2560470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_RESET)) 2561470f0be8SSarah Sharp break; 2562470f0be8SSarah Sharp 2563470f0be8SSarah Sharp /* switch to the long delay after two short delay failures */ 2564470f0be8SSarah Sharp if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 2565470f0be8SSarah Sharp delay = HUB_LONG_RESET_TIME; 2566470f0be8SSarah Sharp 2567470f0be8SSarah Sharp dev_dbg (hub->intfdev, 2568470f0be8SSarah Sharp "port %d not %sreset yet, waiting %dms\n", 2569470f0be8SSarah Sharp port1, warm ? "warm " : "", delay); 2570470f0be8SSarah Sharp } 2571470f0be8SSarah Sharp 25724f43447eSSarah Sharp if ((portstatus & USB_PORT_STAT_RESET)) 2573470f0be8SSarah Sharp return -EBUSY; 25744f43447eSSarah Sharp 2575a24a6078SSarah Sharp if (hub_port_warm_reset_required(hub, portstatus)) 2576a24a6078SSarah Sharp return -ENOTCONN; 257710d674a8SSarah Sharp 25781da177e4SLinus Torvalds /* Device went away? */ 25791da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 25801da177e4SLinus Torvalds return -ENOTCONN; 25811da177e4SLinus Torvalds 2582a24a6078SSarah Sharp /* bomb out completely if the connection bounced. A USB 3.0 2583a24a6078SSarah Sharp * connection may bounce if multiple warm resets were issued, 2584a24a6078SSarah Sharp * but the device may have successfully re-connected. Ignore it. 2585a24a6078SSarah Sharp */ 2586a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev) && 2587a24a6078SSarah Sharp (portchange & USB_PORT_STAT_C_CONNECTION)) 2588dd4dd19eSAlan Stern return -ENOTCONN; 25891da177e4SLinus Torvalds 2590470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_ENABLE)) 2591470f0be8SSarah Sharp return -EBUSY; 2592470f0be8SSarah Sharp 25932d4fa940SSarah Sharp if (!udev) 25942d4fa940SSarah Sharp return 0; 25952d4fa940SSarah Sharp 25960165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2597551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 2598131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2599809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 26000165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 26011da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 26021da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 26031da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 26041da177e4SLinus Torvalds else 26051da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 26061da177e4SLinus Torvalds return 0; 26071da177e4SLinus Torvalds } 26081da177e4SLinus Torvalds 260975d7cf72SAndiry Xu static void hub_port_finish_reset(struct usb_hub *hub, int port1, 2610a24a6078SSarah Sharp struct usb_device *udev, int *status) 26111da177e4SLinus Torvalds { 261275d7cf72SAndiry Xu switch (*status) { 26131da177e4SLinus Torvalds case 0: 2614b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 2615b789696aSDavid Brownell msleep(10 + 40); 26162d4fa940SSarah Sharp if (udev) { 2617a24a6078SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2618a24a6078SSarah Sharp 26193b29b68bSAlan Stern update_devnum(udev, 0); 2620a24a6078SSarah Sharp /* The xHC may think the device is already reset, 2621a24a6078SSarah Sharp * so ignore the status. 26228b8132bcSSarah Sharp */ 26238b8132bcSSarah Sharp if (hcd->driver->reset_device) 26248b8132bcSSarah Sharp hcd->driver->reset_device(hcd, udev); 262575d7cf72SAndiry Xu } 26261da177e4SLinus Torvalds /* FALL THROUGH */ 26271da177e4SLinus Torvalds case -ENOTCONN: 26281da177e4SLinus Torvalds case -ENODEV: 2629ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, 26301da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 26311c7439c6SSarah Sharp if (hub_is_superspeed(hub->hdev)) { 2632ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 263375d7cf72SAndiry Xu USB_PORT_FEAT_C_BH_PORT_RESET); 2634ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 263575d7cf72SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 2636ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2637a24a6078SSarah Sharp USB_PORT_FEAT_C_CONNECTION); 26381c7439c6SSarah Sharp } 2639a24a6078SSarah Sharp if (udev) 264075d7cf72SAndiry Xu usb_set_device_state(udev, *status 26411da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 26421da177e4SLinus Torvalds : USB_STATE_DEFAULT); 264375d7cf72SAndiry Xu break; 264475d7cf72SAndiry Xu } 264575d7cf72SAndiry Xu } 264675d7cf72SAndiry Xu 264775d7cf72SAndiry Xu /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ 264875d7cf72SAndiry Xu static int hub_port_reset(struct usb_hub *hub, int port1, 264975d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 265075d7cf72SAndiry Xu { 265175d7cf72SAndiry Xu int i, status; 2652a24a6078SSarah Sharp u16 portchange, portstatus; 265375d7cf72SAndiry Xu 265475d7cf72SAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 26550fe51aa5SSarah Sharp if (warm) { 265675d7cf72SAndiry Xu dev_err(hub->intfdev, "only USB3 hub support " 265775d7cf72SAndiry Xu "warm reset\n"); 265875d7cf72SAndiry Xu return -EINVAL; 265975d7cf72SAndiry Xu } 26600fe51aa5SSarah Sharp /* Block EHCI CF initialization during the port reset. 26610fe51aa5SSarah Sharp * Some companion controllers don't like it when they mix. 26620fe51aa5SSarah Sharp */ 26630fe51aa5SSarah Sharp down_read(&ehci_cf_port_reset_rwsem); 2664d3b9d7a9SSarah Sharp } else if (!warm) { 2665d3b9d7a9SSarah Sharp /* 2666d3b9d7a9SSarah Sharp * If the caller hasn't explicitly requested a warm reset, 2667d3b9d7a9SSarah Sharp * double check and see if one is needed. 2668d3b9d7a9SSarah Sharp */ 2669d3b9d7a9SSarah Sharp status = hub_port_status(hub, port1, 2670d3b9d7a9SSarah Sharp &portstatus, &portchange); 2671d3b9d7a9SSarah Sharp if (status < 0) 2672d3b9d7a9SSarah Sharp goto done; 2673d3b9d7a9SSarah Sharp 2674d3b9d7a9SSarah Sharp if (hub_port_warm_reset_required(hub, portstatus)) 2675d3b9d7a9SSarah Sharp warm = true; 267675d7cf72SAndiry Xu } 267775d7cf72SAndiry Xu 267875d7cf72SAndiry Xu /* Reset the port */ 267975d7cf72SAndiry Xu for (i = 0; i < PORT_RESET_TRIES; i++) { 268075d7cf72SAndiry Xu status = set_port_feature(hub->hdev, port1, (warm ? 268175d7cf72SAndiry Xu USB_PORT_FEAT_BH_PORT_RESET : 268275d7cf72SAndiry Xu USB_PORT_FEAT_RESET)); 2683e9e88fb7SAlan Stern if (status == -ENODEV) { 2684e9e88fb7SAlan Stern ; /* The hub is gone */ 2685e9e88fb7SAlan Stern } else if (status) { 268675d7cf72SAndiry Xu dev_err(hub->intfdev, 268775d7cf72SAndiry Xu "cannot %sreset port %d (err = %d)\n", 268875d7cf72SAndiry Xu warm ? "warm " : "", port1, status); 268975d7cf72SAndiry Xu } else { 269075d7cf72SAndiry Xu status = hub_port_wait_reset(hub, port1, udev, delay, 269175d7cf72SAndiry Xu warm); 2692e9e88fb7SAlan Stern if (status && status != -ENOTCONN && status != -ENODEV) 269375d7cf72SAndiry Xu dev_dbg(hub->intfdev, 269475d7cf72SAndiry Xu "port_wait_reset: err = %d\n", 269575d7cf72SAndiry Xu status); 269675d7cf72SAndiry Xu } 269775d7cf72SAndiry Xu 2698a24a6078SSarah Sharp /* Check for disconnect or reset */ 269975d7cf72SAndiry Xu if (status == 0 || status == -ENOTCONN || status == -ENODEV) { 2700a24a6078SSarah Sharp hub_port_finish_reset(hub, port1, udev, &status); 2701a24a6078SSarah Sharp 2702a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 270332fe0198SAlan Stern goto done; 2704a24a6078SSarah Sharp 2705a24a6078SSarah Sharp /* 2706a24a6078SSarah Sharp * If a USB 3.0 device migrates from reset to an error 2707a24a6078SSarah Sharp * state, re-issue the warm reset. 2708a24a6078SSarah Sharp */ 2709a24a6078SSarah Sharp if (hub_port_status(hub, port1, 2710a24a6078SSarah Sharp &portstatus, &portchange) < 0) 2711a24a6078SSarah Sharp goto done; 2712a24a6078SSarah Sharp 2713a24a6078SSarah Sharp if (!hub_port_warm_reset_required(hub, portstatus)) 2714a24a6078SSarah Sharp goto done; 2715a24a6078SSarah Sharp 2716a24a6078SSarah Sharp /* 2717a24a6078SSarah Sharp * If the port is in SS.Inactive or Compliance Mode, the 2718a24a6078SSarah Sharp * hot or warm reset failed. Try another warm reset. 2719a24a6078SSarah Sharp */ 2720a24a6078SSarah Sharp if (!warm) { 2721a24a6078SSarah Sharp dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n", 2722a24a6078SSarah Sharp port1); 2723a24a6078SSarah Sharp warm = true; 2724a24a6078SSarah Sharp } 27251da177e4SLinus Torvalds } 27261da177e4SLinus Torvalds 27271da177e4SLinus Torvalds dev_dbg (hub->intfdev, 272875d7cf72SAndiry Xu "port %d not enabled, trying %sreset again...\n", 272975d7cf72SAndiry Xu port1, warm ? "warm " : ""); 27301da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 27311da177e4SLinus Torvalds } 27321da177e4SLinus Torvalds 27331da177e4SLinus Torvalds dev_err (hub->intfdev, 27341da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 27351da177e4SLinus Torvalds port1); 27361da177e4SLinus Torvalds 273732fe0198SAlan Stern done: 27380fe51aa5SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 273932fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 274075d7cf72SAndiry Xu 27411da177e4SLinus Torvalds return status; 27421da177e4SLinus Torvalds } 27431da177e4SLinus Torvalds 27440ed9a57eSAndiry Xu /* Check if a port is power on */ 27450ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 27460ed9a57eSAndiry Xu { 27470ed9a57eSAndiry Xu int ret = 0; 27480ed9a57eSAndiry Xu 27490ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 27500ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 27510ed9a57eSAndiry Xu ret = 1; 27520ed9a57eSAndiry Xu } else { 27530ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 27540ed9a57eSAndiry Xu ret = 1; 27550ed9a57eSAndiry Xu } 27560ed9a57eSAndiry Xu 27570ed9a57eSAndiry Xu return ret; 27580ed9a57eSAndiry Xu } 27590ed9a57eSAndiry Xu 2760d388dab7SAlan Stern #ifdef CONFIG_PM 27611da177e4SLinus Torvalds 27620ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 27630ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 27640ed9a57eSAndiry Xu { 27650ed9a57eSAndiry Xu int ret = 0; 27660ed9a57eSAndiry Xu 27670ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 27680ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 27690ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 27700ed9a57eSAndiry Xu ret = 1; 27710ed9a57eSAndiry Xu } else { 27720ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 27730ed9a57eSAndiry Xu ret = 1; 27740ed9a57eSAndiry Xu } 27750ed9a57eSAndiry Xu 27760ed9a57eSAndiry Xu return ret; 27770ed9a57eSAndiry Xu } 2778b01b03f3SAlan Stern 2779b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2780b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2781b01b03f3SAlan Stern */ 2782b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2783b01b03f3SAlan Stern struct usb_hub *hub, int port1, 2784b01b03f3SAlan Stern int status, unsigned portchange, unsigned portstatus) 2785b01b03f3SAlan Stern { 2786b01b03f3SAlan Stern /* Is the device still present? */ 27870ed9a57eSAndiry Xu if (status || port_is_suspended(hub, portstatus) || 27880ed9a57eSAndiry Xu !port_is_power_on(hub, portstatus) || 27890ed9a57eSAndiry Xu !(portstatus & USB_PORT_STAT_CONNECTION)) { 2790b01b03f3SAlan Stern if (status >= 0) 2791b01b03f3SAlan Stern status = -ENODEV; 2792b01b03f3SAlan Stern } 2793b01b03f3SAlan Stern 279486c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 279586c57edfSAlan Stern * so try a reset-resume instead. 279686c57edfSAlan Stern */ 279786c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 279886c57edfSAlan Stern if (udev->persist_enabled) 279986c57edfSAlan Stern udev->reset_resume = 1; 280086c57edfSAlan Stern else 2801b01b03f3SAlan Stern status = -ENODEV; 280286c57edfSAlan Stern } 2803b01b03f3SAlan Stern 2804b01b03f3SAlan Stern if (status) { 2805b01b03f3SAlan Stern dev_dbg(hub->intfdev, 2806b01b03f3SAlan Stern "port %d status %04x.%04x after resume, %d\n", 2807b01b03f3SAlan Stern port1, portchange, portstatus, status); 2808b01b03f3SAlan Stern } else if (udev->reset_resume) { 2809b01b03f3SAlan Stern 2810b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2811b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2812ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2813b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2814b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2815ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2816b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2817b01b03f3SAlan Stern } 2818b01b03f3SAlan Stern 2819b01b03f3SAlan Stern return status; 2820b01b03f3SAlan Stern } 2821b01b03f3SAlan Stern 2822f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 2823f74631e3SSarah Sharp { 2824f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2825f74631e3SSarah Sharp 2826f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2827f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2828f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2829f74631e3SSarah Sharp return 0; 2830f74631e3SSarah Sharp 2831f74631e3SSarah Sharp /* Clear Feature LTM Enable can only be sent if the device is 2832f74631e3SSarah Sharp * configured. 2833f74631e3SSarah Sharp */ 2834f74631e3SSarah Sharp if (!udev->actconfig) 2835f74631e3SSarah Sharp return 0; 2836f74631e3SSarah Sharp 2837f74631e3SSarah Sharp return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2838f74631e3SSarah Sharp USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2839f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2840f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2841f74631e3SSarah Sharp } 2842f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 2843f74631e3SSarah Sharp 2844f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) 2845f74631e3SSarah Sharp { 2846f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2847f74631e3SSarah Sharp 2848f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2849f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2850f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2851f74631e3SSarah Sharp return; 2852f74631e3SSarah Sharp 2853f74631e3SSarah Sharp /* Set Feature LTM Enable can only be sent if the device is 2854f74631e3SSarah Sharp * configured. 2855f74631e3SSarah Sharp */ 2856f74631e3SSarah Sharp if (!udev->actconfig) 2857f74631e3SSarah Sharp return; 2858f74631e3SSarah Sharp 2859f74631e3SSarah Sharp usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2860f74631e3SSarah Sharp USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2861f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2862f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2863f74631e3SSarah Sharp } 2864f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 2865f74631e3SSarah Sharp 286654a3ac0cSLan Tianyu /* 286728e86165SAlan Stern * usb_enable_remote_wakeup - enable remote wakeup for a device 286854a3ac0cSLan Tianyu * @udev: target device 286954a3ac0cSLan Tianyu * 287028e86165SAlan Stern * For USB-2 devices: Set the device's remote wakeup feature. 287128e86165SAlan Stern * 287228e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 287328e86165SAlan Stern * enable remote wake for the first interface. FIXME if the interface 287428e86165SAlan Stern * association descriptor shows there's more than one function. 287554a3ac0cSLan Tianyu */ 287628e86165SAlan Stern static int usb_enable_remote_wakeup(struct usb_device *udev) 287754a3ac0cSLan Tianyu { 287828e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 287928e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 288028e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 288128e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 288228e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 288328e86165SAlan Stern else 288428e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 288528e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, 288628e86165SAlan Stern USB_INTRF_FUNC_SUSPEND, 288728e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_RW | 288828e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_LP, 288928e86165SAlan Stern NULL, 0, USB_CTRL_SET_TIMEOUT); 289028e86165SAlan Stern } 289128e86165SAlan Stern 289228e86165SAlan Stern /* 289328e86165SAlan Stern * usb_disable_remote_wakeup - disable remote wakeup for a device 289428e86165SAlan Stern * @udev: target device 289528e86165SAlan Stern * 289628e86165SAlan Stern * For USB-2 devices: Clear the device's remote wakeup feature. 289728e86165SAlan Stern * 289828e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 289928e86165SAlan Stern * disable remote wake for the first interface. FIXME if the interface 290028e86165SAlan Stern * association descriptor shows there's more than one function. 290128e86165SAlan Stern */ 290228e86165SAlan Stern static int usb_disable_remote_wakeup(struct usb_device *udev) 290328e86165SAlan Stern { 290428e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 290528e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 290628e86165SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 290728e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 290828e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 290928e86165SAlan Stern else 291054a3ac0cSLan Tianyu return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 291154a3ac0cSLan Tianyu USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, 291254a3ac0cSLan Tianyu USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, 291354a3ac0cSLan Tianyu USB_CTRL_SET_TIMEOUT); 291454a3ac0cSLan Tianyu } 29151da177e4SLinus Torvalds 2916e583d9dbSAlan Stern /* Count of wakeup-enabled devices at or below udev */ 2917e583d9dbSAlan Stern static unsigned wakeup_enabled_descendants(struct usb_device *udev) 2918e583d9dbSAlan Stern { 2919e583d9dbSAlan Stern struct usb_hub *hub = usb_hub_to_struct_hub(udev); 2920e583d9dbSAlan Stern 2921e583d9dbSAlan Stern return udev->do_remote_wakeup + 2922e583d9dbSAlan Stern (hub ? hub->wakeup_enabled_descendants : 0); 2923e583d9dbSAlan Stern } 2924e583d9dbSAlan Stern 29251da177e4SLinus Torvalds /* 2926140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 2927624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 29285edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 29291da177e4SLinus Torvalds * 29301da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 29311da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 29321da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 2933140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 29341da177e4SLinus Torvalds * to disconnect devices while they are suspended. 29351da177e4SLinus Torvalds * 2936390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 2937390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 2938390a8c34SDavid Brownell * 2939624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 2940624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 2941624d6c07SAlan Stern * All devices below the suspended port are also suspended. 2942624d6c07SAlan Stern * 2943624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 2944624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 2945624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 2946624d6c07SAlan Stern * some cases, this wakes the USB host. 2947624d6c07SAlan Stern * 29481da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 29491da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 29501da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 29511da177e4SLinus Torvalds * 29524956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 29534956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 29544956eccdSAlan Stern * State transitions include: 29554956eccdSAlan Stern * 29564956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 29574956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 29584956eccdSAlan Stern * 29594956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 29604956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 29614956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 29624956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 29634956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 29644956eccdSAlan Stern * 2965e583d9dbSAlan Stern * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get 2966e583d9dbSAlan Stern * suspended until their bus goes into global suspend (i.e., the root 29670aa2832dSAlan Stern * hub is suspended). Nevertheless, we change @udev->state to 29680aa2832dSAlan Stern * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual 29690aa2832dSAlan Stern * upstream port setting is stored in @udev->port_is_suspended. 29704956eccdSAlan Stern * 29711da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 29721da177e4SLinus Torvalds */ 297365bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 29741da177e4SLinus Torvalds { 2975ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2976ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2977624d6c07SAlan Stern int port1 = udev->portnum; 2978624d6c07SAlan Stern int status; 29790aa2832dSAlan Stern bool really_suspend = true; 29804956eccdSAlan Stern 2981624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 2982624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 2983624d6c07SAlan Stern * 2984624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 2985624d6c07SAlan Stern * we don't explicitly enable it here. 2986624d6c07SAlan Stern */ 2987624d6c07SAlan Stern if (udev->do_remote_wakeup) { 298828e86165SAlan Stern status = usb_enable_remote_wakeup(udev); 29890c487206SOliver Neukum if (status) { 2990624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 2991624d6c07SAlan Stern status); 29920c487206SOliver Neukum /* bail if autosuspend is requested */ 29935b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 29944fae6f0fSAlan Stern goto err_wakeup; 29950c487206SOliver Neukum } 2996624d6c07SAlan Stern } 2997624d6c07SAlan Stern 299865580b43SAndiry Xu /* disable USB2 hardware LPM */ 299965580b43SAndiry Xu if (udev->usb2_hw_lpm_enabled == 1) 300065580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 0); 300165580b43SAndiry Xu 3002f74631e3SSarah Sharp if (usb_disable_ltm(udev)) { 30034fae6f0fSAlan Stern dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); 30044fae6f0fSAlan Stern status = -ENOMEM; 30054fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 30064fae6f0fSAlan Stern goto err_ltm; 3007f74631e3SSarah Sharp } 30088306095fSSarah Sharp if (usb_unlocked_disable_lpm(udev)) { 30094fae6f0fSAlan Stern dev_err(&udev->dev, "Failed to disable LPM before suspend\n."); 30104fae6f0fSAlan Stern status = -ENOMEM; 30114fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 30124fae6f0fSAlan Stern goto err_lpm3; 30138306095fSSarah Sharp } 30148306095fSSarah Sharp 3015624d6c07SAlan Stern /* see 7.1.7.6 */ 3016a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3017c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); 3018e583d9dbSAlan Stern 30190aa2832dSAlan Stern /* 30200aa2832dSAlan Stern * For system suspend, we do not need to enable the suspend feature 30210aa2832dSAlan Stern * on individual USB-2 ports. The devices will automatically go 30220aa2832dSAlan Stern * into suspend a few ms after the root hub stops sending packets. 30230aa2832dSAlan Stern * The USB 2.0 spec calls this "global suspend". 3024e583d9dbSAlan Stern * 3025e583d9dbSAlan Stern * However, many USB hubs have a bug: They don't relay wakeup requests 3026e583d9dbSAlan Stern * from a downstream port if the port's suspend feature isn't on. 3027e583d9dbSAlan Stern * Therefore we will turn on the suspend feature if udev or any of its 3028e583d9dbSAlan Stern * descendants is enabled for remote wakeup. 30290aa2832dSAlan Stern */ 3030e583d9dbSAlan Stern else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) 3031e583d9dbSAlan Stern status = set_port_feature(hub->hdev, port1, 3032e583d9dbSAlan Stern USB_PORT_FEAT_SUSPEND); 30330aa2832dSAlan Stern else { 30340aa2832dSAlan Stern really_suspend = false; 30350aa2832dSAlan Stern status = 0; 30360aa2832dSAlan Stern } 3037624d6c07SAlan Stern if (status) { 3038624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 3039624d6c07SAlan Stern port1, status); 3040cbb33004SAlan Stern 30414fae6f0fSAlan Stern /* Try to enable USB3 LPM and LTM again */ 30424fae6f0fSAlan Stern usb_unlocked_enable_lpm(udev); 30434fae6f0fSAlan Stern err_lpm3: 30444fae6f0fSAlan Stern usb_enable_ltm(udev); 30454fae6f0fSAlan Stern err_ltm: 3046c3e751e4SAndiry Xu /* Try to enable USB2 hardware LPM again */ 3047c3e751e4SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 3048c3e751e4SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 3049c3e751e4SAndiry Xu 30504fae6f0fSAlan Stern if (udev->do_remote_wakeup) 30514fae6f0fSAlan Stern (void) usb_disable_remote_wakeup(udev); 30524fae6f0fSAlan Stern err_wakeup: 30538306095fSSarah Sharp 3054cbb33004SAlan Stern /* System sleep transitions should never fail */ 30555b1b0b81SAlan Stern if (!PMSG_IS_AUTO(msg)) 3056cbb33004SAlan Stern status = 0; 3057624d6c07SAlan Stern } else { 305830b1a7a3SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", 305930b1a7a3SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : ""), 306030b1a7a3SAlan Stern udev->do_remote_wakeup); 30610aa2832dSAlan Stern if (really_suspend) { 3062bfd1e910SAlan Stern udev->port_is_suspended = 1; 3063e583d9dbSAlan Stern 3064e583d9dbSAlan Stern /* device has up to 10 msec to fully suspend */ 3065624d6c07SAlan Stern msleep(10); 3066624d6c07SAlan Stern } 3067e583d9dbSAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 30680aa2832dSAlan Stern } 3069ad493e5eSLan Tianyu 30704fae6f0fSAlan Stern if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled) { 3071ad493e5eSLan Tianyu pm_runtime_put_sync(&port_dev->dev); 3072ad493e5eSLan Tianyu port_dev->did_runtime_put = true; 3073ad493e5eSLan Tianyu } 3074ad493e5eSLan Tianyu 3075c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 30764956eccdSAlan Stern return status; 30771da177e4SLinus Torvalds } 3078f3f3253dSDavid Brownell 30791da177e4SLinus Torvalds /* 3080390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 3081390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 308254515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 30831da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 30841da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 30851da177e4SLinus Torvalds * in the tree that's rooted at this device. 308654515fe5SAlan Stern * 308754515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 308854515fe5SAlan Stern * status check is done. 30891da177e4SLinus Torvalds */ 3090140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 30911da177e4SLinus Torvalds { 309254515fe5SAlan Stern int status = 0; 309307e72b95SOliver Neukum u16 devstatus = 0; 30941da177e4SLinus Torvalds 30951da177e4SLinus Torvalds /* caller owns the udev device lock */ 3096b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 3097b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 30981da177e4SLinus Torvalds 30991da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 31001da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 31011da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 31021da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 31031da177e4SLinus Torvalds */ 31041da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 31051da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 31061da177e4SLinus Torvalds : USB_STATE_ADDRESS); 31071da177e4SLinus Torvalds 310854515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 310954515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 311054515fe5SAlan Stern * operation is carried out here, after the port has been 311154515fe5SAlan Stern * resumed. 311254515fe5SAlan Stern */ 311354515fe5SAlan Stern if (udev->reset_resume) 311486c57edfSAlan Stern retry_reset_resume: 3115742120c6SMing Lei status = usb_reset_and_verify_device(udev); 311654515fe5SAlan Stern 31171da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 31181da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 31191da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 31201da177e4SLinus Torvalds */ 312154515fe5SAlan Stern if (status == 0) { 312246dede46SAlan Stern devstatus = 0; 31231da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 312486c57edfSAlan Stern 312586c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 312686c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 312786c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 312886c57edfSAlan Stern udev->reset_resume = 1; 312986c57edfSAlan Stern goto retry_reset_resume; 313086c57edfSAlan Stern } 313154515fe5SAlan Stern } 3132b40b7a90SAlan Stern 3133624d6c07SAlan Stern if (status) { 3134624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 31351da177e4SLinus Torvalds status); 313607e72b95SOliver Neukum /* 313707e72b95SOliver Neukum * There are a few quirky devices which violate the standard 313807e72b95SOliver Neukum * by claiming to have remote wakeup enabled after a reset, 313907e72b95SOliver Neukum * which crash if the feature is cleared, hence check for 314007e72b95SOliver Neukum * udev->reset_resume 314107e72b95SOliver Neukum */ 314207e72b95SOliver Neukum } else if (udev->actconfig && !udev->reset_resume) { 314328e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) { 314454a3ac0cSLan Tianyu if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 314528e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 314654a3ac0cSLan Tianyu } else { 314754a3ac0cSLan Tianyu status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, 314854a3ac0cSLan Tianyu &devstatus); 314954a3ac0cSLan Tianyu if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP 315054a3ac0cSLan Tianyu | USB_INTRF_STAT_FUNC_RW)) 315128e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 315254a3ac0cSLan Tianyu } 315354a3ac0cSLan Tianyu 3154a8e7c565SAlan Stern if (status) 3155b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 3156b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 3157b9cef6c3SWu Fengguang status); 31581da177e4SLinus Torvalds status = 0; 31591da177e4SLinus Torvalds } 31601da177e4SLinus Torvalds return status; 31611da177e4SLinus Torvalds } 31621da177e4SLinus Torvalds 3163624d6c07SAlan Stern /* 3164624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 3165624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 3166624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 3167624d6c07SAlan Stern * 3168624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 3169624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 3170624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 3171624d6c07SAlan Stern * the host and the device is the same as it was when the device 3172624d6c07SAlan Stern * suspended. 3173624d6c07SAlan Stern * 3174feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 3175feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 317654515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 317754515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 317854515fe5SAlan Stern * 317954515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 318054515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 318154515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 318254515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 318354515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 318454515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 318554515fe5SAlan Stern * made to appear as if it had not disconnected. 318654515fe5SAlan Stern * 3187742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 3188feccc30dSAlan Stern * every effort to insure that the same device is present after the 318954515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 319054515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 319154515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 319254515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 319354515fe5SAlan Stern * new card is corrupted and the system crashes. 319454515fe5SAlan Stern * 3195624d6c07SAlan Stern * Returns 0 on success, else negative errno. 3196624d6c07SAlan Stern */ 319765bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 31981da177e4SLinus Torvalds { 3199ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3200ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3201624d6c07SAlan Stern int port1 = udev->portnum; 32021da177e4SLinus Torvalds int status; 3203d25450c6SAlan Stern u16 portchange, portstatus; 3204d25450c6SAlan Stern 3205ad493e5eSLan Tianyu if (port_dev->did_runtime_put) { 3206ad493e5eSLan Tianyu status = pm_runtime_get_sync(&port_dev->dev); 3207ad493e5eSLan Tianyu port_dev->did_runtime_put = false; 3208ad493e5eSLan Tianyu if (status < 0) { 3209ad493e5eSLan Tianyu dev_dbg(&udev->dev, "can't resume usb port, status %d\n", 3210ad493e5eSLan Tianyu status); 3211ad493e5eSLan Tianyu return status; 3212ad493e5eSLan Tianyu } 3213ad493e5eSLan Tianyu } 3214ad493e5eSLan Tianyu 3215d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 3216d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 32170ed9a57eSAndiry Xu if (status == 0 && !port_is_suspended(hub, portstatus)) 3218d25450c6SAlan Stern goto SuspendCleared; 32191da177e4SLinus Torvalds 3220781b2137SMatthias Beyer /* dev_dbg(hub->intfdev, "resume port %d\n", port1); */ 32211da177e4SLinus Torvalds 3222d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 3223d5cbad4bSAlan Stern 32241da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 3225a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3226c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); 3227a7114230SAndiry Xu else 3228ad493e5eSLan Tianyu status = usb_clear_port_feature(hub->hdev, 32291da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 32301da177e4SLinus Torvalds if (status) { 3231624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 32321da177e4SLinus Torvalds port1, status); 32331da177e4SLinus Torvalds } else { 32341da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 3235645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 32365b1b0b81SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : "")); 32371da177e4SLinus Torvalds msleep(25); 32381da177e4SLinus Torvalds 32391da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 32401da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 32411da177e4SLinus Torvalds * sequence. 32421da177e4SLinus Torvalds */ 3243d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 324454515fe5SAlan Stern 32451da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 32461da177e4SLinus Torvalds msleep(10); 32471da177e4SLinus Torvalds } 3248b01b03f3SAlan Stern 3249b01b03f3SAlan Stern SuspendCleared: 3250b01b03f3SAlan Stern if (status == 0) { 3251bfd1e910SAlan Stern udev->port_is_suspended = 0; 3252a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 3253a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 3254ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3255a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 3256a7114230SAndiry Xu } else { 3257b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 3258ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3259b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 32601da177e4SLinus Torvalds } 3261a7114230SAndiry Xu } 32621da177e4SLinus Torvalds 3263d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 3264d5cbad4bSAlan Stern 3265b01b03f3SAlan Stern status = check_port_resume_type(udev, 3266b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 326754515fe5SAlan Stern if (status == 0) 326854515fe5SAlan Stern status = finish_port_resume(udev); 326954515fe5SAlan Stern if (status < 0) { 327054515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 327154515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 327265580b43SAndiry Xu } else { 327365580b43SAndiry Xu /* Try to enable USB2 hardware LPM */ 327465580b43SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 327565580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 32768306095fSSarah Sharp 3277f74631e3SSarah Sharp /* Try to enable USB3 LTM and LPM */ 3278f74631e3SSarah Sharp usb_enable_ltm(udev); 32798306095fSSarah Sharp usb_unlocked_enable_lpm(udev); 328054515fe5SAlan Stern } 328165580b43SAndiry Xu 32821da177e4SLinus Torvalds return status; 32831da177e4SLinus Torvalds } 32841da177e4SLinus Torvalds 328584ebc102SAlan Stern #ifdef CONFIG_PM_RUNTIME 328684ebc102SAlan Stern 32878808f00cSAlan Stern /* caller has locked udev */ 32880534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 32891da177e4SLinus Torvalds { 32901da177e4SLinus Torvalds int status = 0; 32911da177e4SLinus Torvalds 32921da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 3293645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 32949bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 32959bbdf1e0SAlan Stern if (status == 0) { 32969bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 32979bbdf1e0SAlan Stern usb_autosuspend_device(udev); 32989bbdf1e0SAlan Stern } 3299d25450c6SAlan Stern } 33001da177e4SLinus Torvalds return status; 33011da177e4SLinus Torvalds } 33021da177e4SLinus Torvalds 3303d388dab7SAlan Stern #endif 3304d388dab7SAlan Stern 3305e6f30deaSMing Lei static int check_ports_changed(struct usb_hub *hub) 3306e6f30deaSMing Lei { 3307e6f30deaSMing Lei int port1; 3308e6f30deaSMing Lei 3309e6f30deaSMing Lei for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { 3310e6f30deaSMing Lei u16 portstatus, portchange; 3311e6f30deaSMing Lei int status; 3312e6f30deaSMing Lei 3313e6f30deaSMing Lei status = hub_port_status(hub, port1, &portstatus, &portchange); 3314e6f30deaSMing Lei if (!status && portchange) 3315e6f30deaSMing Lei return 1; 3316e6f30deaSMing Lei } 3317e6f30deaSMing Lei return 0; 3318e6f30deaSMing Lei } 3319e6f30deaSMing Lei 3320db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 33211da177e4SLinus Torvalds { 33221da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 33231da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 33241da177e4SLinus Torvalds unsigned port1; 33254296c70aSSarah Sharp int status; 33261da177e4SLinus Torvalds 3327e583d9dbSAlan Stern /* 3328e583d9dbSAlan Stern * Warn if children aren't already suspended. 3329e583d9dbSAlan Stern * Also, add up the number of wakeup-enabled descendants. 3330e583d9dbSAlan Stern */ 3331e583d9dbSAlan Stern hub->wakeup_enabled_descendants = 0; 33321da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 33331da177e4SLinus Torvalds struct usb_device *udev; 33341da177e4SLinus Torvalds 3335ff823c79SLan Tianyu udev = hub->ports[port1 - 1]->child; 33366840d255SAlan Stern if (udev && udev->can_submit) { 3337cbb33004SAlan Stern dev_warn(&intf->dev, "port %d nyet suspended\n", port1); 33385b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 3339c9f89fa4SDavid Brownell return -EBUSY; 3340c9f89fa4SDavid Brownell } 3341e583d9dbSAlan Stern if (udev) 3342e583d9dbSAlan Stern hub->wakeup_enabled_descendants += 3343e583d9dbSAlan Stern wakeup_enabled_descendants(udev); 33441da177e4SLinus Torvalds } 3345e6f30deaSMing Lei 3346e6f30deaSMing Lei if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { 3347e6f30deaSMing Lei /* check if there are changes pending on hub ports */ 3348e6f30deaSMing Lei if (check_ports_changed(hub)) { 3349e6f30deaSMing Lei if (PMSG_IS_AUTO(msg)) 3350e6f30deaSMing Lei return -EBUSY; 3351e6f30deaSMing Lei pm_wakeup_event(&hdev->dev, 2000); 3352e6f30deaSMing Lei } 3353e6f30deaSMing Lei } 3354e6f30deaSMing Lei 33554296c70aSSarah Sharp if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { 33564296c70aSSarah Sharp /* Enable hub to send remote wakeup for all ports. */ 33574296c70aSSarah Sharp for (port1 = 1; port1 <= hdev->maxchild; port1++) { 33584296c70aSSarah Sharp status = set_port_feature(hdev, 33594296c70aSSarah Sharp port1 | 33604296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_CONNECT | 33614296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | 33624296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, 33634296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_MASK); 33644296c70aSSarah Sharp } 33654296c70aSSarah Sharp } 33661da177e4SLinus Torvalds 3367441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 336840f122f3SAlan Stern 3369c9f89fa4SDavid Brownell /* stop khubd and related activity */ 33704330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 3371b6f6436dSAlan Stern return 0; 33721da177e4SLinus Torvalds } 33731da177e4SLinus Torvalds 33741da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 33751da177e4SLinus Torvalds { 33761da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 33771da177e4SLinus Torvalds 33785e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3379f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 33801da177e4SLinus Torvalds return 0; 33811da177e4SLinus Torvalds } 33821da177e4SLinus Torvalds 3383b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 3384f07600cfSAlan Stern { 3385b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 3386f07600cfSAlan Stern 33875e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3388f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 3389f07600cfSAlan Stern return 0; 3390f07600cfSAlan Stern } 3391f07600cfSAlan Stern 339254515fe5SAlan Stern /** 339354515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 339454515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 339554515fe5SAlan Stern * 339654515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 339754515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 3398feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 3399feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 3400feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 3401feccc30dSAlan Stern * the others will be disconnected. 340254515fe5SAlan Stern */ 340354515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 340454515fe5SAlan Stern { 340554515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 340654515fe5SAlan Stern rhdev->reset_resume = 1; 340754515fe5SAlan Stern } 340854515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 340954515fe5SAlan Stern 34101ea7e0e8SSarah Sharp static const char * const usb3_lpm_names[] = { 34111ea7e0e8SSarah Sharp "U0", 34121ea7e0e8SSarah Sharp "U1", 34131ea7e0e8SSarah Sharp "U2", 34141ea7e0e8SSarah Sharp "U3", 34151ea7e0e8SSarah Sharp }; 34161ea7e0e8SSarah Sharp 34171ea7e0e8SSarah Sharp /* 34181ea7e0e8SSarah Sharp * Send a Set SEL control transfer to the device, prior to enabling 34191ea7e0e8SSarah Sharp * device-initiated U1 or U2. This lets the device know the exit latencies from 34201ea7e0e8SSarah Sharp * the time the device initiates a U1 or U2 exit, to the time it will receive a 34211ea7e0e8SSarah Sharp * packet from the host. 34221ea7e0e8SSarah Sharp * 34231ea7e0e8SSarah Sharp * This function will fail if the SEL or PEL values for udev are greater than 34241ea7e0e8SSarah Sharp * the maximum allowed values for the link state to be enabled. 34251ea7e0e8SSarah Sharp */ 34261ea7e0e8SSarah Sharp static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) 34271ea7e0e8SSarah Sharp { 34281ea7e0e8SSarah Sharp struct usb_set_sel_req *sel_values; 34291ea7e0e8SSarah Sharp unsigned long long u1_sel; 34301ea7e0e8SSarah Sharp unsigned long long u1_pel; 34311ea7e0e8SSarah Sharp unsigned long long u2_sel; 34321ea7e0e8SSarah Sharp unsigned long long u2_pel; 34331ea7e0e8SSarah Sharp int ret; 34341ea7e0e8SSarah Sharp 343538d7f688SXenia Ragiadakou if (udev->state != USB_STATE_CONFIGURED) 343638d7f688SXenia Ragiadakou return 0; 343738d7f688SXenia Ragiadakou 34381ea7e0e8SSarah Sharp /* Convert SEL and PEL stored in ns to us */ 34391ea7e0e8SSarah Sharp u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); 34401ea7e0e8SSarah Sharp u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); 34411ea7e0e8SSarah Sharp u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); 34421ea7e0e8SSarah Sharp u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); 34431ea7e0e8SSarah Sharp 34441ea7e0e8SSarah Sharp /* 34451ea7e0e8SSarah Sharp * Make sure that the calculated SEL and PEL values for the link 34461ea7e0e8SSarah Sharp * state we're enabling aren't bigger than the max SEL/PEL 34471ea7e0e8SSarah Sharp * value that will fit in the SET SEL control transfer. 34481ea7e0e8SSarah Sharp * Otherwise the device would get an incorrect idea of the exit 34491ea7e0e8SSarah Sharp * latency for the link state, and could start a device-initiated 34501ea7e0e8SSarah Sharp * U1/U2 when the exit latencies are too high. 34511ea7e0e8SSarah Sharp */ 34521ea7e0e8SSarah Sharp if ((state == USB3_LPM_U1 && 34531ea7e0e8SSarah Sharp (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || 34541ea7e0e8SSarah Sharp u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || 34551ea7e0e8SSarah Sharp (state == USB3_LPM_U2 && 34561ea7e0e8SSarah Sharp (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || 34571ea7e0e8SSarah Sharp u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { 34581510a1a2SSarah Sharp dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", 34591ea7e0e8SSarah Sharp usb3_lpm_names[state], u1_sel, u1_pel); 34601ea7e0e8SSarah Sharp return -EINVAL; 34611ea7e0e8SSarah Sharp } 34621ea7e0e8SSarah Sharp 34631ea7e0e8SSarah Sharp /* 34641ea7e0e8SSarah Sharp * If we're enabling device-initiated LPM for one link state, 34651ea7e0e8SSarah Sharp * but the other link state has a too high SEL or PEL value, 34661ea7e0e8SSarah Sharp * just set those values to the max in the Set SEL request. 34671ea7e0e8SSarah Sharp */ 34681ea7e0e8SSarah Sharp if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) 34691ea7e0e8SSarah Sharp u1_sel = USB3_LPM_MAX_U1_SEL_PEL; 34701ea7e0e8SSarah Sharp 34711ea7e0e8SSarah Sharp if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) 34721ea7e0e8SSarah Sharp u1_pel = USB3_LPM_MAX_U1_SEL_PEL; 34731ea7e0e8SSarah Sharp 34741ea7e0e8SSarah Sharp if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) 34751ea7e0e8SSarah Sharp u2_sel = USB3_LPM_MAX_U2_SEL_PEL; 34761ea7e0e8SSarah Sharp 34771ea7e0e8SSarah Sharp if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) 34781ea7e0e8SSarah Sharp u2_pel = USB3_LPM_MAX_U2_SEL_PEL; 34791ea7e0e8SSarah Sharp 34801ea7e0e8SSarah Sharp /* 34811ea7e0e8SSarah Sharp * usb_enable_lpm() can be called as part of a failed device reset, 34821ea7e0e8SSarah Sharp * which may be initiated by an error path of a mass storage driver. 34831ea7e0e8SSarah Sharp * Therefore, use GFP_NOIO. 34841ea7e0e8SSarah Sharp */ 34851ea7e0e8SSarah Sharp sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); 34861ea7e0e8SSarah Sharp if (!sel_values) 34871ea7e0e8SSarah Sharp return -ENOMEM; 34881ea7e0e8SSarah Sharp 34891ea7e0e8SSarah Sharp sel_values->u1_sel = u1_sel; 34901ea7e0e8SSarah Sharp sel_values->u1_pel = u1_pel; 34911ea7e0e8SSarah Sharp sel_values->u2_sel = cpu_to_le16(u2_sel); 34921ea7e0e8SSarah Sharp sel_values->u2_pel = cpu_to_le16(u2_pel); 34931ea7e0e8SSarah Sharp 34941ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 34951ea7e0e8SSarah Sharp USB_REQ_SET_SEL, 34961ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 34971ea7e0e8SSarah Sharp 0, 0, 34981ea7e0e8SSarah Sharp sel_values, sizeof *(sel_values), 34991ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 35001ea7e0e8SSarah Sharp kfree(sel_values); 35011ea7e0e8SSarah Sharp return ret; 35021ea7e0e8SSarah Sharp } 35031ea7e0e8SSarah Sharp 35041ea7e0e8SSarah Sharp /* 35051ea7e0e8SSarah Sharp * Enable or disable device-initiated U1 or U2 transitions. 35061ea7e0e8SSarah Sharp */ 35071ea7e0e8SSarah Sharp static int usb_set_device_initiated_lpm(struct usb_device *udev, 35081ea7e0e8SSarah Sharp enum usb3_link_state state, bool enable) 35091ea7e0e8SSarah Sharp { 35101ea7e0e8SSarah Sharp int ret; 35111ea7e0e8SSarah Sharp int feature; 35121ea7e0e8SSarah Sharp 35131ea7e0e8SSarah Sharp switch (state) { 35141ea7e0e8SSarah Sharp case USB3_LPM_U1: 35151ea7e0e8SSarah Sharp feature = USB_DEVICE_U1_ENABLE; 35161ea7e0e8SSarah Sharp break; 35171ea7e0e8SSarah Sharp case USB3_LPM_U2: 35181ea7e0e8SSarah Sharp feature = USB_DEVICE_U2_ENABLE; 35191ea7e0e8SSarah Sharp break; 35201ea7e0e8SSarah Sharp default: 35211ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", 35221ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable"); 35231ea7e0e8SSarah Sharp return -EINVAL; 35241ea7e0e8SSarah Sharp } 35251ea7e0e8SSarah Sharp 35261ea7e0e8SSarah Sharp if (udev->state != USB_STATE_CONFIGURED) { 35271ea7e0e8SSarah Sharp dev_dbg(&udev->dev, "%s: Can't %s %s state " 35281ea7e0e8SSarah Sharp "for unconfigured device.\n", 35291ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable", 35301ea7e0e8SSarah Sharp usb3_lpm_names[state]); 35311ea7e0e8SSarah Sharp return 0; 35321ea7e0e8SSarah Sharp } 35331ea7e0e8SSarah Sharp 35341ea7e0e8SSarah Sharp if (enable) { 35351ea7e0e8SSarah Sharp /* 35361ea7e0e8SSarah Sharp * Now send the control transfer to enable device-initiated LPM 35371ea7e0e8SSarah Sharp * for either U1 or U2. 35381ea7e0e8SSarah Sharp */ 35391ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 35401ea7e0e8SSarah Sharp USB_REQ_SET_FEATURE, 35411ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 35421ea7e0e8SSarah Sharp feature, 35431ea7e0e8SSarah Sharp 0, NULL, 0, 35441ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 35451ea7e0e8SSarah Sharp } else { 35461ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 35471ea7e0e8SSarah Sharp USB_REQ_CLEAR_FEATURE, 35481ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 35491ea7e0e8SSarah Sharp feature, 35501ea7e0e8SSarah Sharp 0, NULL, 0, 35511ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 35521ea7e0e8SSarah Sharp } 35531ea7e0e8SSarah Sharp if (ret < 0) { 35541ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", 35551ea7e0e8SSarah Sharp enable ? "Enable" : "Disable", 35561ea7e0e8SSarah Sharp usb3_lpm_names[state]); 35571ea7e0e8SSarah Sharp return -EBUSY; 35581ea7e0e8SSarah Sharp } 35591ea7e0e8SSarah Sharp return 0; 35601ea7e0e8SSarah Sharp } 35611ea7e0e8SSarah Sharp 35621ea7e0e8SSarah Sharp static int usb_set_lpm_timeout(struct usb_device *udev, 35631ea7e0e8SSarah Sharp enum usb3_link_state state, int timeout) 35641ea7e0e8SSarah Sharp { 35651ea7e0e8SSarah Sharp int ret; 35661ea7e0e8SSarah Sharp int feature; 35671ea7e0e8SSarah Sharp 35681ea7e0e8SSarah Sharp switch (state) { 35691ea7e0e8SSarah Sharp case USB3_LPM_U1: 35701ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 35711ea7e0e8SSarah Sharp break; 35721ea7e0e8SSarah Sharp case USB3_LPM_U2: 35731ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 35741ea7e0e8SSarah Sharp break; 35751ea7e0e8SSarah Sharp default: 35761ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", 35771ea7e0e8SSarah Sharp __func__); 35781ea7e0e8SSarah Sharp return -EINVAL; 35791ea7e0e8SSarah Sharp } 35801ea7e0e8SSarah Sharp 35811ea7e0e8SSarah Sharp if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && 35821ea7e0e8SSarah Sharp timeout != USB3_LPM_DEVICE_INITIATED) { 35831ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " 35841ea7e0e8SSarah Sharp "which is a reserved value.\n", 35851ea7e0e8SSarah Sharp usb3_lpm_names[state], timeout); 35861ea7e0e8SSarah Sharp return -EINVAL; 35871ea7e0e8SSarah Sharp } 35881ea7e0e8SSarah Sharp 35891ea7e0e8SSarah Sharp ret = set_port_feature(udev->parent, 35901ea7e0e8SSarah Sharp USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, 35911ea7e0e8SSarah Sharp feature); 35921ea7e0e8SSarah Sharp if (ret < 0) { 35931ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," 35941ea7e0e8SSarah Sharp "error code %i\n", usb3_lpm_names[state], 35951ea7e0e8SSarah Sharp timeout, ret); 35961ea7e0e8SSarah Sharp return -EBUSY; 35971ea7e0e8SSarah Sharp } 35981ea7e0e8SSarah Sharp if (state == USB3_LPM_U1) 35991ea7e0e8SSarah Sharp udev->u1_params.timeout = timeout; 36001ea7e0e8SSarah Sharp else 36011ea7e0e8SSarah Sharp udev->u2_params.timeout = timeout; 36021ea7e0e8SSarah Sharp return 0; 36031ea7e0e8SSarah Sharp } 36041ea7e0e8SSarah Sharp 36051ea7e0e8SSarah Sharp /* 36061ea7e0e8SSarah Sharp * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated 36071ea7e0e8SSarah Sharp * U1/U2 entry. 36081ea7e0e8SSarah Sharp * 36091ea7e0e8SSarah Sharp * We will attempt to enable U1 or U2, but there are no guarantees that the 36101ea7e0e8SSarah Sharp * control transfers to set the hub timeout or enable device-initiated U1/U2 36111ea7e0e8SSarah Sharp * will be successful. 36121ea7e0e8SSarah Sharp * 36131ea7e0e8SSarah Sharp * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI 36141ea7e0e8SSarah Sharp * driver know about it. If that call fails, it should be harmless, and just 36151ea7e0e8SSarah Sharp * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. 36161ea7e0e8SSarah Sharp */ 36171ea7e0e8SSarah Sharp static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 36181ea7e0e8SSarah Sharp enum usb3_link_state state) 36191ea7e0e8SSarah Sharp { 362065a95b75SSarah Sharp int timeout, ret; 3621ae8963adSSarah Sharp __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; 3622ae8963adSSarah Sharp __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; 3623ae8963adSSarah Sharp 3624ae8963adSSarah Sharp /* If the device says it doesn't have *any* exit latency to come out of 3625ae8963adSSarah Sharp * U1 or U2, it's probably lying. Assume it doesn't implement that link 3626ae8963adSSarah Sharp * state. 3627ae8963adSSarah Sharp */ 3628ae8963adSSarah Sharp if ((state == USB3_LPM_U1 && u1_mel == 0) || 3629ae8963adSSarah Sharp (state == USB3_LPM_U2 && u2_mel == 0)) 3630ae8963adSSarah Sharp return; 36311ea7e0e8SSarah Sharp 363265a95b75SSarah Sharp /* 363365a95b75SSarah Sharp * First, let the device know about the exit latencies 363465a95b75SSarah Sharp * associated with the link state we're about to enable. 363565a95b75SSarah Sharp */ 363665a95b75SSarah Sharp ret = usb_req_set_sel(udev, state); 363765a95b75SSarah Sharp if (ret < 0) { 363865a95b75SSarah Sharp dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", 363965a95b75SSarah Sharp usb3_lpm_names[state]); 364065a95b75SSarah Sharp return; 364165a95b75SSarah Sharp } 364265a95b75SSarah Sharp 36431ea7e0e8SSarah Sharp /* We allow the host controller to set the U1/U2 timeout internally 36441ea7e0e8SSarah Sharp * first, so that it can change its schedule to account for the 36451ea7e0e8SSarah Sharp * additional latency to send data to a device in a lower power 36461ea7e0e8SSarah Sharp * link state. 36471ea7e0e8SSarah Sharp */ 36481ea7e0e8SSarah Sharp timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); 36491ea7e0e8SSarah Sharp 36501ea7e0e8SSarah Sharp /* xHCI host controller doesn't want to enable this LPM state. */ 36511ea7e0e8SSarah Sharp if (timeout == 0) 36521ea7e0e8SSarah Sharp return; 36531ea7e0e8SSarah Sharp 36541ea7e0e8SSarah Sharp if (timeout < 0) { 36551ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not enable %s link state, " 36561ea7e0e8SSarah Sharp "xHCI error %i.\n", usb3_lpm_names[state], 36571ea7e0e8SSarah Sharp timeout); 36581ea7e0e8SSarah Sharp return; 36591ea7e0e8SSarah Sharp } 36601ea7e0e8SSarah Sharp 36611ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, timeout)) 36621ea7e0e8SSarah Sharp /* If we can't set the parent hub U1/U2 timeout, 36631ea7e0e8SSarah Sharp * device-initiated LPM won't be allowed either, so let the xHCI 36641ea7e0e8SSarah Sharp * host know that this link state won't be enabled. 36651ea7e0e8SSarah Sharp */ 36661ea7e0e8SSarah Sharp hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); 36671ea7e0e8SSarah Sharp 36681ea7e0e8SSarah Sharp /* Only a configured device will accept the Set Feature U1/U2_ENABLE */ 36691ea7e0e8SSarah Sharp else if (udev->actconfig) 36701ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, true); 36711ea7e0e8SSarah Sharp 36721ea7e0e8SSarah Sharp } 36731ea7e0e8SSarah Sharp 36741ea7e0e8SSarah Sharp /* 36751ea7e0e8SSarah Sharp * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated 36761ea7e0e8SSarah Sharp * U1/U2 entry. 36771ea7e0e8SSarah Sharp * 36781ea7e0e8SSarah Sharp * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. 36791ea7e0e8SSarah Sharp * If zero is returned, the parent will not allow the link to go into U1/U2. 36801ea7e0e8SSarah Sharp * 36811ea7e0e8SSarah Sharp * If zero is returned, device-initiated U1/U2 entry may still be enabled, but 36821ea7e0e8SSarah Sharp * it won't have an effect on the bus link state because the parent hub will 36831ea7e0e8SSarah Sharp * still disallow device-initiated U1/U2 entry. 36841ea7e0e8SSarah Sharp * 36851ea7e0e8SSarah Sharp * If zero is returned, the xHCI host controller may still think U1/U2 entry is 36861ea7e0e8SSarah Sharp * possible. The result will be slightly more bus bandwidth will be taken up 36871ea7e0e8SSarah Sharp * (to account for U1/U2 exit latency), but it should be harmless. 36881ea7e0e8SSarah Sharp */ 36891ea7e0e8SSarah Sharp static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 36901ea7e0e8SSarah Sharp enum usb3_link_state state) 36911ea7e0e8SSarah Sharp { 36921ea7e0e8SSarah Sharp int feature; 36931ea7e0e8SSarah Sharp 36941ea7e0e8SSarah Sharp switch (state) { 36951ea7e0e8SSarah Sharp case USB3_LPM_U1: 36961ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 36971ea7e0e8SSarah Sharp break; 36981ea7e0e8SSarah Sharp case USB3_LPM_U2: 36991ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 37001ea7e0e8SSarah Sharp break; 37011ea7e0e8SSarah Sharp default: 37021ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", 37031ea7e0e8SSarah Sharp __func__); 37041ea7e0e8SSarah Sharp return -EINVAL; 37051ea7e0e8SSarah Sharp } 37061ea7e0e8SSarah Sharp 37071ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, 0)) 37081ea7e0e8SSarah Sharp return -EBUSY; 37091ea7e0e8SSarah Sharp 37101ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, false); 37111ea7e0e8SSarah Sharp 37121ea7e0e8SSarah Sharp if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) 37131ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " 37141ea7e0e8SSarah Sharp "bus schedule bandwidth may be impacted.\n", 37151ea7e0e8SSarah Sharp usb3_lpm_names[state]); 37161ea7e0e8SSarah Sharp return 0; 37171ea7e0e8SSarah Sharp } 37181ea7e0e8SSarah Sharp 37191ea7e0e8SSarah Sharp /* 37201ea7e0e8SSarah Sharp * Disable hub-initiated and device-initiated U1 and U2 entry. 37211ea7e0e8SSarah Sharp * Caller must own the bandwidth_mutex. 37221ea7e0e8SSarah Sharp * 37231ea7e0e8SSarah Sharp * This will call usb_enable_lpm() on failure, which will decrement 37241ea7e0e8SSarah Sharp * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. 37251ea7e0e8SSarah Sharp */ 37261ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 37271ea7e0e8SSarah Sharp { 37281ea7e0e8SSarah Sharp struct usb_hcd *hcd; 37291ea7e0e8SSarah Sharp 37301ea7e0e8SSarah Sharp if (!udev || !udev->parent || 37311ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 37321ea7e0e8SSarah Sharp !udev->lpm_capable) 37331ea7e0e8SSarah Sharp return 0; 37341ea7e0e8SSarah Sharp 37351ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 37361ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) 37371ea7e0e8SSarah Sharp return 0; 37381ea7e0e8SSarah Sharp 37391ea7e0e8SSarah Sharp udev->lpm_disable_count++; 374055558c33SDan Carpenter if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) 37411ea7e0e8SSarah Sharp return 0; 37421ea7e0e8SSarah Sharp 37431ea7e0e8SSarah Sharp /* If LPM is enabled, attempt to disable it. */ 37441ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) 37451ea7e0e8SSarah Sharp goto enable_lpm; 37461ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) 37471ea7e0e8SSarah Sharp goto enable_lpm; 37481ea7e0e8SSarah Sharp 37491ea7e0e8SSarah Sharp return 0; 37501ea7e0e8SSarah Sharp 37511ea7e0e8SSarah Sharp enable_lpm: 37521ea7e0e8SSarah Sharp usb_enable_lpm(udev); 37531ea7e0e8SSarah Sharp return -EBUSY; 37541ea7e0e8SSarah Sharp } 37551ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 37561ea7e0e8SSarah Sharp 37571ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ 37581ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 37591ea7e0e8SSarah Sharp { 37601ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 37611ea7e0e8SSarah Sharp int ret; 37621ea7e0e8SSarah Sharp 37631ea7e0e8SSarah Sharp if (!hcd) 37641ea7e0e8SSarah Sharp return -EINVAL; 37651ea7e0e8SSarah Sharp 37661ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 37671ea7e0e8SSarah Sharp ret = usb_disable_lpm(udev); 37681ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 37691ea7e0e8SSarah Sharp 37701ea7e0e8SSarah Sharp return ret; 37711ea7e0e8SSarah Sharp } 37721ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 37731ea7e0e8SSarah Sharp 37741ea7e0e8SSarah Sharp /* 37751ea7e0e8SSarah Sharp * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The 37761ea7e0e8SSarah Sharp * xHCI host policy may prevent U1 or U2 from being enabled. 37771ea7e0e8SSarah Sharp * 37781ea7e0e8SSarah Sharp * Other callers may have disabled link PM, so U1 and U2 entry will be disabled 37791ea7e0e8SSarah Sharp * until the lpm_disable_count drops to zero. Caller must own the 37801ea7e0e8SSarah Sharp * bandwidth_mutex. 37811ea7e0e8SSarah Sharp */ 37821ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) 37831ea7e0e8SSarah Sharp { 37841ea7e0e8SSarah Sharp struct usb_hcd *hcd; 37851ea7e0e8SSarah Sharp 37861ea7e0e8SSarah Sharp if (!udev || !udev->parent || 37871ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 37881ea7e0e8SSarah Sharp !udev->lpm_capable) 37891ea7e0e8SSarah Sharp return; 37901ea7e0e8SSarah Sharp 37911ea7e0e8SSarah Sharp udev->lpm_disable_count--; 37921ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 37931ea7e0e8SSarah Sharp /* Double check that we can both enable and disable LPM. 37941ea7e0e8SSarah Sharp * Device must be configured to accept set feature U1/U2 timeout. 37951ea7e0e8SSarah Sharp */ 37961ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || 37971ea7e0e8SSarah Sharp !hcd->driver->disable_usb3_lpm_timeout) 37981ea7e0e8SSarah Sharp return; 37991ea7e0e8SSarah Sharp 38001ea7e0e8SSarah Sharp if (udev->lpm_disable_count > 0) 38011ea7e0e8SSarah Sharp return; 38021ea7e0e8SSarah Sharp 38031ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U1); 38041ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U2); 38051ea7e0e8SSarah Sharp } 38061ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 38071ea7e0e8SSarah Sharp 38081ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ 38091ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) 38101ea7e0e8SSarah Sharp { 38111ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 38121ea7e0e8SSarah Sharp 38131ea7e0e8SSarah Sharp if (!hcd) 38141ea7e0e8SSarah Sharp return; 38151ea7e0e8SSarah Sharp 38161ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 38171ea7e0e8SSarah Sharp usb_enable_lpm(udev); 38181ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 38191ea7e0e8SSarah Sharp } 38201ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 38211ea7e0e8SSarah Sharp 38221ea7e0e8SSarah Sharp 3823d388dab7SAlan Stern #else /* CONFIG_PM */ 3824d388dab7SAlan Stern 3825511366daSAndrew Morton #define hub_suspend NULL 3826511366daSAndrew Morton #define hub_resume NULL 3827f07600cfSAlan Stern #define hub_reset_resume NULL 38281ea7e0e8SSarah Sharp 38291ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 38301ea7e0e8SSarah Sharp { 38311ea7e0e8SSarah Sharp return 0; 38321ea7e0e8SSarah Sharp } 3833e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 38341ea7e0e8SSarah Sharp 38351ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) { } 3836e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 38371ea7e0e8SSarah Sharp 38381ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 38391ea7e0e8SSarah Sharp { 38401ea7e0e8SSarah Sharp return 0; 38411ea7e0e8SSarah Sharp } 3842e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 38431ea7e0e8SSarah Sharp 38441ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) { } 3845e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 3846f74631e3SSarah Sharp 3847f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 3848f74631e3SSarah Sharp { 3849f74631e3SSarah Sharp return 0; 3850f74631e3SSarah Sharp } 3851f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 3852f74631e3SSarah Sharp 3853f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) { } 3854f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 3855c4b51a43SAlan Stern 3856c4b51a43SAlan Stern #endif /* CONFIG_PM */ 3857d388dab7SAlan Stern 38581da177e4SLinus Torvalds 38591da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 38601da177e4SLinus Torvalds * 38611da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 38621da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 38631da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 38641da177e4SLinus Torvalds * 38651da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 38661da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 38671da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 38681da177e4SLinus Torvalds * 38691da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 38701da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 38711da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 38721da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 38731da177e4SLinus Torvalds */ 3874ad493e5eSLan Tianyu int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) 38751da177e4SLinus Torvalds { 38761da177e4SLinus Torvalds int ret; 38771da177e4SLinus Torvalds int total_time, stable_time = 0; 38781da177e4SLinus Torvalds u16 portchange, portstatus; 38791da177e4SLinus Torvalds unsigned connection = 0xffff; 38801da177e4SLinus Torvalds 38811da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 38821da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 38831da177e4SLinus Torvalds if (ret < 0) 38841da177e4SLinus Torvalds return ret; 38851da177e4SLinus Torvalds 38861da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 38871da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 3888ad493e5eSLan Tianyu if (!must_be_connected || 3889ad493e5eSLan Tianyu (connection == USB_PORT_STAT_CONNECTION)) 38901da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 38911da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 38921da177e4SLinus Torvalds break; 38931da177e4SLinus Torvalds } else { 38941da177e4SLinus Torvalds stable_time = 0; 38951da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 38961da177e4SLinus Torvalds } 38971da177e4SLinus Torvalds 38981da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 3899ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 39001da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 39011da177e4SLinus Torvalds } 39021da177e4SLinus Torvalds 39031da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 39041da177e4SLinus Torvalds break; 39051da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 39061da177e4SLinus Torvalds } 39071da177e4SLinus Torvalds 39081da177e4SLinus Torvalds dev_dbg (hub->intfdev, 39091da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 39101da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 39111da177e4SLinus Torvalds 39121da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 39131da177e4SLinus Torvalds return -ETIMEDOUT; 39141da177e4SLinus Torvalds return portstatus; 39151da177e4SLinus Torvalds } 39161da177e4SLinus Torvalds 3917fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 39181da177e4SLinus Torvalds { 3919ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 3920ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 39212caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 39221da177e4SLinus Torvalds } 3923fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 39241da177e4SLinus Torvalds 39251da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 39261da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 39271da177e4SLinus Torvalds 39284326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 39291da177e4SLinus Torvalds { 39301da177e4SLinus Torvalds int retval; 3931c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 39321da177e4SLinus Torvalds 3933c6515272SSarah Sharp /* 3934c6515272SSarah Sharp * The host controller will choose the device address, 3935c6515272SSarah Sharp * instead of the core having chosen it earlier 3936c6515272SSarah Sharp */ 3937c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 39381da177e4SLinus Torvalds return -EINVAL; 39391da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 39401da177e4SLinus Torvalds return 0; 39411da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 39421da177e4SLinus Torvalds return -EINVAL; 3943c8d4af8eSAndiry Xu if (hcd->driver->address_device) 3944c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 3945c8d4af8eSAndiry Xu else 39461da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 39474326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 39481da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 39491da177e4SLinus Torvalds if (retval == 0) { 39503b29b68bSAlan Stern update_devnum(udev, devnum); 39514953d141SDavid Vrabel /* Device now using proper address. */ 39521da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 3953fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 39541da177e4SLinus Torvalds } 39551da177e4SLinus Torvalds return retval; 39561da177e4SLinus Torvalds } 39571da177e4SLinus Torvalds 3958890dae88SMathias Nyman /* 3959890dae88SMathias Nyman * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM 3960890dae88SMathias Nyman * when they're plugged into a USB 2.0 port, but they don't work when LPM is 3961890dae88SMathias Nyman * enabled. 3962890dae88SMathias Nyman * 3963890dae88SMathias Nyman * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the 3964890dae88SMathias Nyman * device says it supports the new USB 2.0 Link PM errata by setting the BESL 3965890dae88SMathias Nyman * support bit in the BOS descriptor. 3966890dae88SMathias Nyman */ 3967890dae88SMathias Nyman static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) 3968890dae88SMathias Nyman { 3969890dae88SMathias Nyman int connect_type; 3970890dae88SMathias Nyman 3971890dae88SMathias Nyman if (!udev->usb2_hw_lpm_capable) 3972890dae88SMathias Nyman return; 3973890dae88SMathias Nyman 3974890dae88SMathias Nyman connect_type = usb_get_hub_port_connect_type(udev->parent, 3975890dae88SMathias Nyman udev->portnum); 3976890dae88SMathias Nyman 3977890dae88SMathias Nyman if ((udev->bos->ext_cap->bmAttributes & USB_BESL_SUPPORT) || 3978890dae88SMathias Nyman connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 3979890dae88SMathias Nyman udev->usb2_hw_lpm_allowed = 1; 3980890dae88SMathias Nyman usb_set_usb2_hardware_lpm(udev, 1); 3981890dae88SMathias Nyman } 3982890dae88SMathias Nyman } 3983890dae88SMathias Nyman 39841da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 39851da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 39861da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 39871da177e4SLinus Torvalds * 39881da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 3989742120c6SMing Lei * usb_reset_and_verify_device), the caller must own the device lock. For a 39901da177e4SLinus Torvalds * newly detected device that is not accessible through any global 39911da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 39921da177e4SLinus Torvalds */ 39931da177e4SLinus Torvalds static int 39941da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 39951da177e4SLinus Torvalds int retry_counter) 39961da177e4SLinus Torvalds { 39974186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 39981da177e4SLinus Torvalds 39991da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4000e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 40011da177e4SLinus Torvalds int i, j, retval; 40021da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 40031da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 4004e538dfdaSMichal Nazarewicz const char *speed; 40054326ed0bSAlan Stern int devnum = udev->devnum; 40061da177e4SLinus Torvalds 40071da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 40081da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 40091da177e4SLinus Torvalds */ 40101da177e4SLinus Torvalds if (!hdev->parent) { 40111da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 40121da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 40131da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 40141da177e4SLinus Torvalds } 40151da177e4SLinus Torvalds 40161da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 40171da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 40181da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 40191da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 40201da177e4SLinus Torvalds 40214186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 40221da177e4SLinus Torvalds 40231da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 4024e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 402575d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 40261da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 40271da177e4SLinus Torvalds goto fail; 40281da177e4SLinus Torvalds /* success, speed is known */ 402907194ab7SLuben Tuikov 40301da177e4SLinus Torvalds retval = -ENODEV; 40311da177e4SLinus Torvalds 40321da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 40331da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 40341da177e4SLinus Torvalds goto fail; 40351da177e4SLinus Torvalds } 40361da177e4SLinus Torvalds oldspeed = udev->speed; 40371da177e4SLinus Torvalds 40381da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 40391da177e4SLinus Torvalds * it's fixed size except for full speed devices. 40405bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 40415bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 40421da177e4SLinus Torvalds */ 40431da177e4SLinus Torvalds switch (udev->speed) { 40446b403b02SSarah Sharp case USB_SPEED_SUPER: 4045551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 4046551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 40475bb6e0aeSInaky Perez-Gonzalez break; 40481da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 4049551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 40501da177e4SLinus Torvalds break; 40511da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 40521da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 40531da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 40541da177e4SLinus Torvalds * then correct our initial guess. 40551da177e4SLinus Torvalds */ 4056551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 40571da177e4SLinus Torvalds break; 40581da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 4059551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 40601da177e4SLinus Torvalds break; 40611da177e4SLinus Torvalds default: 40621da177e4SLinus Torvalds goto fail; 40631da177e4SLinus Torvalds } 40641da177e4SLinus Torvalds 4065e538dfdaSMichal Nazarewicz if (udev->speed == USB_SPEED_WIRELESS) 4066e538dfdaSMichal Nazarewicz speed = "variable speed Wireless"; 4067e538dfdaSMichal Nazarewicz else 4068e538dfdaSMichal Nazarewicz speed = usb_speed_string(udev->speed); 4069e538dfdaSMichal Nazarewicz 4070c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 407183a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 4072e538dfdaSMichal Nazarewicz "%s %s USB device number %d using %s\n", 4073e538dfdaSMichal Nazarewicz (udev->config) ? "reset" : "new", speed, 40743b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 40751da177e4SLinus Torvalds 40761da177e4SLinus Torvalds /* Set up TT records, if needed */ 40771da177e4SLinus Torvalds if (hdev->tt) { 40781da177e4SLinus Torvalds udev->tt = hdev->tt; 40791da177e4SLinus Torvalds udev->ttport = hdev->ttport; 40801da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 40811da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 4082d199c96dSAlan Stern if (!hub->tt.hub) { 4083d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 4084d199c96dSAlan Stern retval = -EINVAL; 4085d199c96dSAlan Stern goto fail; 4086d199c96dSAlan Stern } 40871da177e4SLinus Torvalds udev->tt = &hub->tt; 40881da177e4SLinus Torvalds udev->ttport = port1; 40891da177e4SLinus Torvalds } 40901da177e4SLinus Torvalds 40911da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 40921da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 40931da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 40941da177e4SLinus Torvalds * Change it cautiously. 40951da177e4SLinus Torvalds * 40961da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 40971da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 40981da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 40991da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 41001da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 41011da177e4SLinus Torvalds * value. 41021da177e4SLinus Torvalds */ 41031da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 4104c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { 41051da177e4SLinus Torvalds struct usb_device_descriptor *buf; 41061da177e4SLinus Torvalds int r = 0; 41071da177e4SLinus Torvalds 41081da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 41091da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 41101da177e4SLinus Torvalds if (!buf) { 41111da177e4SLinus Torvalds retval = -ENOMEM; 41121da177e4SLinus Torvalds continue; 41131da177e4SLinus Torvalds } 41141da177e4SLinus Torvalds 4115b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 4116b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 4117b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 41181da177e4SLinus Torvalds */ 41191da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 41201da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 41211da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 41221da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 41231da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 41241da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 4125fd7c519dSJaroslav Kysela initial_descriptor_timeout); 41261da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 41275bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 41281da177e4SLinus Torvalds if (buf->bDescriptorType == 41291da177e4SLinus Torvalds USB_DT_DEVICE) { 41301da177e4SLinus Torvalds r = 0; 41311da177e4SLinus Torvalds break; 41321da177e4SLinus Torvalds } 41331da177e4SLinus Torvalds /* FALL THROUGH */ 41341da177e4SLinus Torvalds default: 41351da177e4SLinus Torvalds if (r == 0) 41361da177e4SLinus Torvalds r = -EPROTO; 41371da177e4SLinus Torvalds break; 41381da177e4SLinus Torvalds } 41391da177e4SLinus Torvalds if (r == 0) 41401da177e4SLinus Torvalds break; 41411da177e4SLinus Torvalds } 41421da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 41431da177e4SLinus Torvalds buf->bMaxPacketSize0; 41441da177e4SLinus Torvalds kfree(buf); 41451da177e4SLinus Torvalds 414675d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 41471da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 41481da177e4SLinus Torvalds goto fail; 41491da177e4SLinus Torvalds if (oldspeed != udev->speed) { 41501da177e4SLinus Torvalds dev_dbg(&udev->dev, 41511da177e4SLinus Torvalds "device reset changed speed!\n"); 41521da177e4SLinus Torvalds retval = -ENODEV; 41531da177e4SLinus Torvalds goto fail; 41541da177e4SLinus Torvalds } 41551da177e4SLinus Torvalds if (r) { 4156e9e88fb7SAlan Stern if (r != -ENODEV) 4157e9e88fb7SAlan Stern dev_err(&udev->dev, "device descriptor read/64, error %d\n", 4158b9cef6c3SWu Fengguang r); 41591da177e4SLinus Torvalds retval = -EMSGSIZE; 41601da177e4SLinus Torvalds continue; 41611da177e4SLinus Torvalds } 41621da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 41631da177e4SLinus Torvalds } 41641da177e4SLinus Torvalds 41656c529cdcSInaky Perez-Gonzalez /* 41666c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 41676c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 41686c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 41696c529cdcSInaky Perez-Gonzalez */ 41706c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 41711da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 41724326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 41731da177e4SLinus Torvalds if (retval >= 0) 41741da177e4SLinus Torvalds break; 41751da177e4SLinus Torvalds msleep(200); 41761da177e4SLinus Torvalds } 41771da177e4SLinus Torvalds if (retval < 0) { 4178e9e88fb7SAlan Stern if (retval != -ENODEV) 4179e9e88fb7SAlan Stern dev_err(&udev->dev, "device not accepting address %d, error %d\n", 41804326ed0bSAlan Stern devnum, retval); 41811da177e4SLinus Torvalds goto fail; 41821da177e4SLinus Torvalds } 4183c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 4184c6515272SSarah Sharp devnum = udev->devnum; 4185c6515272SSarah Sharp dev_info(&udev->dev, 41863b29b68bSAlan Stern "%s SuperSpeed USB device number %d using %s\n", 4187c6515272SSarah Sharp (udev->config) ? "reset" : "new", 41883b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 4189c6515272SSarah Sharp } 41901da177e4SLinus Torvalds 41911da177e4SLinus Torvalds /* cope with hardware quirkiness: 41921da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 41931da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 41941da177e4SLinus Torvalds */ 41951da177e4SLinus Torvalds msleep(10); 4196c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) 41971da177e4SLinus Torvalds break; 41986c529cdcSInaky Perez-Gonzalez } 41991da177e4SLinus Torvalds 42001da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 42011da177e4SLinus Torvalds if (retval < 8) { 4202e9e88fb7SAlan Stern if (retval != -ENODEV) 4203b9cef6c3SWu Fengguang dev_err(&udev->dev, 4204b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 4205b9cef6c3SWu Fengguang retval); 42061da177e4SLinus Torvalds if (retval >= 0) 42071da177e4SLinus Torvalds retval = -EMSGSIZE; 42081da177e4SLinus Torvalds } else { 42091da177e4SLinus Torvalds retval = 0; 42101da177e4SLinus Torvalds break; 42111da177e4SLinus Torvalds } 42121da177e4SLinus Torvalds } 42131da177e4SLinus Torvalds if (retval) 42141da177e4SLinus Torvalds goto fail; 42151da177e4SLinus Torvalds 4216b76baa81SPeter Chen if (hcd->phy && !hdev->parent) 4217ac96511bSPeter Chen usb_phy_notify_connect(hcd->phy, udev->speed); 4218b76baa81SPeter Chen 4219d8aec3dbSElric Fu /* 4220d8aec3dbSElric Fu * Some superspeed devices have finished the link training process 4221d8aec3dbSElric Fu * and attached to a superspeed hub port, but the device descriptor 4222d8aec3dbSElric Fu * got from those devices show they aren't superspeed devices. Warm 4223d8aec3dbSElric Fu * reset the port attached by the devices can fix them. 4224d8aec3dbSElric Fu */ 4225d8aec3dbSElric Fu if ((udev->speed == USB_SPEED_SUPER) && 4226d8aec3dbSElric Fu (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { 4227d8aec3dbSElric Fu dev_err(&udev->dev, "got a wrong device descriptor, " 4228d8aec3dbSElric Fu "warm reset device\n"); 4229d8aec3dbSElric Fu hub_port_reset(hub, port1, udev, 4230d8aec3dbSElric Fu HUB_BH_RESET_TIME, true); 4231d8aec3dbSElric Fu retval = -EINVAL; 4232d8aec3dbSElric Fu goto fail; 4233d8aec3dbSElric Fu } 4234d8aec3dbSElric Fu 42356b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 42366b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 42376b403b02SSarah Sharp i = 512; 42386b403b02SSarah Sharp else 42396b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 424029cc8897SKuninori Morimoto if (usb_endpoint_maxp(&udev->ep0.desc) != i) { 424156626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 42421da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 424356626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 42441da177e4SLinus Torvalds retval = -EMSGSIZE; 42451da177e4SLinus Torvalds goto fail; 42461da177e4SLinus Torvalds } 424756626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 42481da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 424956626a72SAlan Stern else 425056626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 42511da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 4252fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 42531da177e4SLinus Torvalds } 42541da177e4SLinus Torvalds 42551da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 42561da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 4257e9e88fb7SAlan Stern if (retval != -ENODEV) 4258b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 4259b9cef6c3SWu Fengguang retval); 42601da177e4SLinus Torvalds if (retval >= 0) 42611da177e4SLinus Torvalds retval = -ENOMSG; 42621da177e4SLinus Torvalds goto fail; 42631da177e4SLinus Torvalds } 42641da177e4SLinus Torvalds 42651ff4df56SAndiry Xu if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { 42661ff4df56SAndiry Xu retval = usb_get_bos_descriptor(udev); 426751e0a012SSarah Sharp if (!retval) { 4268d9b2099cSSarah Sharp udev->lpm_capable = usb_device_supports_lpm(udev); 426951e0a012SSarah Sharp usb_set_lpm_parameters(udev); 427051e0a012SSarah Sharp } 42711ff4df56SAndiry Xu } 42723148bf04SAndiry Xu 42731da177e4SLinus Torvalds retval = 0; 427448f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 427548f24970SAlek Du if (hcd->driver->update_device) 427648f24970SAlek Du hcd->driver->update_device(hcd, udev); 4277890dae88SMathias Nyman hub_set_initial_usb2_lpm_policy(udev); 42781da177e4SLinus Torvalds fail: 42794326ed0bSAlan Stern if (retval) { 42801da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 42813b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 42824326ed0bSAlan Stern } 42834186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 42841da177e4SLinus Torvalds return retval; 42851da177e4SLinus Torvalds } 42861da177e4SLinus Torvalds 42871da177e4SLinus Torvalds static void 42881da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 42891da177e4SLinus Torvalds { 42901da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 42911da177e4SLinus Torvalds int status; 42921da177e4SLinus Torvalds 4293e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 42941da177e4SLinus Torvalds if (qual == NULL) 42951da177e4SLinus Torvalds return; 42961da177e4SLinus Torvalds 42971da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 42981da177e4SLinus Torvalds qual, sizeof *qual); 42991da177e4SLinus Torvalds if (status == sizeof *qual) { 43001da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 43011da177e4SLinus Torvalds "connect to a high speed hub\n"); 43021da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 43031da177e4SLinus Torvalds if (hub->has_indicators) { 43041da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 4305c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 43061da177e4SLinus Torvalds } 43071da177e4SLinus Torvalds } 43081da177e4SLinus Torvalds kfree(qual); 43091da177e4SLinus Torvalds } 43101da177e4SLinus Torvalds 43111da177e4SLinus Torvalds static unsigned 43121da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 43131da177e4SLinus Torvalds { 43141da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 43151da177e4SLinus Torvalds int remaining; 431655c52718SAlan Stern int port1; 43171da177e4SLinus Torvalds 431855c52718SAlan Stern if (!hub->limited_power) 43191da177e4SLinus Torvalds return 0; 43201da177e4SLinus Torvalds 432155c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 432255c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 4323ff823c79SLan Tianyu struct usb_device *udev = hub->ports[port1 - 1]->child; 432455c52718SAlan Stern int delta; 4325430ee58eSSebastian Andrzej Siewior unsigned unit_load; 43261da177e4SLinus Torvalds 43271da177e4SLinus Torvalds if (!udev) 43281da177e4SLinus Torvalds continue; 4329430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(udev)) 4330430ee58eSSebastian Andrzej Siewior unit_load = 150; 4331430ee58eSSebastian Andrzej Siewior else 4332430ee58eSSebastian Andrzej Siewior unit_load = 100; 43331da177e4SLinus Torvalds 4334430ee58eSSebastian Andrzej Siewior /* 4335430ee58eSSebastian Andrzej Siewior * Unconfigured devices may not use more than one unit load, 4336430ee58eSSebastian Andrzej Siewior * or 8mA for OTG ports 4337430ee58eSSebastian Andrzej Siewior */ 43381da177e4SLinus Torvalds if (udev->actconfig) 43398d8479dbSSebastian Andrzej Siewior delta = usb_get_max_power(udev, udev->actconfig); 434055c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 4341430ee58eSSebastian Andrzej Siewior delta = unit_load; 43421da177e4SLinus Torvalds else 434355c52718SAlan Stern delta = 8; 434455c52718SAlan Stern if (delta > hub->mA_per_port) 4345b9cef6c3SWu Fengguang dev_warn(&udev->dev, 4346b9cef6c3SWu Fengguang "%dmA is over %umA budget for port %d!\n", 434755c52718SAlan Stern delta, hub->mA_per_port, port1); 43481da177e4SLinus Torvalds remaining -= delta; 43491da177e4SLinus Torvalds } 43501da177e4SLinus Torvalds if (remaining < 0) { 435155c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 435255c52718SAlan Stern -remaining); 43531da177e4SLinus Torvalds remaining = 0; 43541da177e4SLinus Torvalds } 43551da177e4SLinus Torvalds return remaining; 43561da177e4SLinus Torvalds } 43571da177e4SLinus Torvalds 43581da177e4SLinus Torvalds /* Handle physical or logical connection change events. 43591da177e4SLinus Torvalds * This routine is called when: 43601da177e4SLinus Torvalds * a port connection-change occurs; 43611da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 4362742120c6SMing Lei * usb_reset_and_verify_device() encounters changed descriptors (as from 43631da177e4SLinus Torvalds * a firmware download) 43641da177e4SLinus Torvalds * caller already locked the hub 43651da177e4SLinus Torvalds */ 43661da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 43671da177e4SLinus Torvalds u16 portstatus, u16 portchange) 43681da177e4SLinus Torvalds { 43691da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 43701da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 437190da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 437224618b0cSAlan Stern unsigned wHubCharacteristics = 437324618b0cSAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 43748808f00cSAlan Stern struct usb_device *udev; 43751da177e4SLinus Torvalds int status, i; 4376430ee58eSSebastian Andrzej Siewior unsigned unit_load; 43771da177e4SLinus Torvalds 43781da177e4SLinus Torvalds dev_dbg (hub_dev, 43791da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 4380131dec34SSarah Sharp port1, portstatus, portchange, portspeed(hub, portstatus)); 43811da177e4SLinus Torvalds 43821da177e4SLinus Torvalds if (hub->has_indicators) { 43831da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 43841da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 43851da177e4SLinus Torvalds } 43861da177e4SLinus Torvalds 43871da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 43881da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 43891da177e4SLinus Torvalds if (hdev->bus->is_b_host) 439024618b0cSAlan Stern portchange &= ~(USB_PORT_STAT_C_CONNECTION | 439124618b0cSAlan Stern USB_PORT_STAT_C_ENABLE); 43921da177e4SLinus Torvalds #endif 43931da177e4SLinus Torvalds 43948808f00cSAlan Stern /* Try to resuscitate an existing device */ 4395ff823c79SLan Tianyu udev = hub->ports[port1 - 1]->child; 43968808f00cSAlan Stern if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 43978808f00cSAlan Stern udev->state != USB_STATE_NOTATTACHED) { 43988808f00cSAlan Stern usb_lock_device(udev); 43998808f00cSAlan Stern if (portstatus & USB_PORT_STAT_ENABLE) { 44008808f00cSAlan Stern status = 0; /* Nothing to do */ 44018808f00cSAlan Stern 440284ebc102SAlan Stern #ifdef CONFIG_PM_RUNTIME 44035257d97aSAlan Stern } else if (udev->state == USB_STATE_SUSPENDED && 44045257d97aSAlan Stern udev->persist_enabled) { 44058808f00cSAlan Stern /* For a suspended device, treat this as a 44068808f00cSAlan Stern * remote wakeup event. 44078808f00cSAlan Stern */ 44080534d468SAlan Stern status = usb_remote_wakeup(udev); 44098808f00cSAlan Stern #endif 44108808f00cSAlan Stern 44118808f00cSAlan Stern } else { 44125257d97aSAlan Stern status = -ENODEV; /* Don't resuscitate */ 44138808f00cSAlan Stern } 44148808f00cSAlan Stern usb_unlock_device(udev); 44158808f00cSAlan Stern 44168808f00cSAlan Stern if (status == 0) { 44178808f00cSAlan Stern clear_bit(port1, hub->change_bits); 44188808f00cSAlan Stern return; 44198808f00cSAlan Stern } 44208808f00cSAlan Stern } 44218808f00cSAlan Stern 442224618b0cSAlan Stern /* Disconnect any existing devices under this port */ 4423b76baa81SPeter Chen if (udev) { 4424b76baa81SPeter Chen if (hcd->phy && !hdev->parent && 4425b76baa81SPeter Chen !(portstatus & USB_PORT_STAT_CONNECTION)) 4426ac96511bSPeter Chen usb_phy_notify_disconnect(hcd->phy, udev->speed); 4427ff823c79SLan Tianyu usb_disconnect(&hub->ports[port1 - 1]->child); 4428b76baa81SPeter Chen } 442924618b0cSAlan Stern clear_bit(port1, hub->change_bits); 443024618b0cSAlan Stern 4431253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 4432253e0572SAlan Stern * disconnect or the connect status changes. 4433253e0572SAlan Stern */ 4434253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4435253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 4436253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 4437253e0572SAlan Stern 44385257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 44395257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 4440ad493e5eSLan Tianyu status = hub_port_debounce_be_stable(hub, port1); 44415257d97aSAlan Stern if (status < 0) { 4442e9e88fb7SAlan Stern if (status != -ENODEV && printk_ratelimit()) 44435257d97aSAlan Stern dev_err(hub_dev, "connect-debounce failed, " 44445257d97aSAlan Stern "port %d disabled\n", port1); 44455257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 44465257d97aSAlan Stern } else { 44475257d97aSAlan Stern portstatus = status; 44485257d97aSAlan Stern } 44495257d97aSAlan Stern } 44505257d97aSAlan Stern 4451253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 4452253e0572SAlan Stern * the device was "removed". 4453253e0572SAlan Stern */ 4454253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4455253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 44561da177e4SLinus Torvalds 44571da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 445874ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 44590ed9a57eSAndiry Xu && !port_is_power_on(hub, portstatus)) 44601da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 44611da177e4SLinus Torvalds 44621da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 44631da177e4SLinus Torvalds goto done; 44641da177e4SLinus Torvalds return; 44651da177e4SLinus Torvalds } 4466430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hub->hdev)) 4467430ee58eSSebastian Andrzej Siewior unit_load = 150; 4468430ee58eSSebastian Andrzej Siewior else 4469430ee58eSSebastian Andrzej Siewior unit_load = 100; 44701da177e4SLinus Torvalds 4471e9e88fb7SAlan Stern status = 0; 44721da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 44731da177e4SLinus Torvalds 44741da177e4SLinus Torvalds /* reallocate for each attempt, since references 44751da177e4SLinus Torvalds * to the previous one can escape in various ways 44761da177e4SLinus Torvalds */ 44771da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 44781da177e4SLinus Torvalds if (!udev) { 44791da177e4SLinus Torvalds dev_err (hub_dev, 44801da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 44811da177e4SLinus Torvalds port1); 44821da177e4SLinus Torvalds goto done; 44831da177e4SLinus Torvalds } 44841da177e4SLinus Torvalds 44851da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 448655c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 4487b6956ffaSAlan Stern udev->level = hdev->level + 1; 44888af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 44891da177e4SLinus Torvalds 4490131dec34SSarah Sharp /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ 4491131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 4492e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 4493e7b77172SSarah Sharp else 4494e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 4495e7b77172SSarah Sharp 44963b29b68bSAlan Stern choose_devnum(udev); 4497c6515272SSarah Sharp if (udev->devnum <= 0) { 4498c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 4499c6515272SSarah Sharp goto loop; 4500c6515272SSarah Sharp } 4501c6515272SSarah Sharp 4502e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 45031da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 45041da177e4SLinus Torvalds if (status < 0) 45051da177e4SLinus Torvalds goto loop; 45061da177e4SLinus Torvalds 450793362a87SPhil Dibowitz usb_detect_quirks(udev); 450893362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 450993362a87SPhil Dibowitz msleep(1000); 451093362a87SPhil Dibowitz 45111da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 45121da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 45131da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 45141da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 45151da177e4SLinus Torvalds * on the parent. 45161da177e4SLinus Torvalds */ 45171da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 4518430ee58eSSebastian Andrzej Siewior && udev->bus_mA <= unit_load) { 45191da177e4SLinus Torvalds u16 devstat; 45201da177e4SLinus Torvalds 45211da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 45221da177e4SLinus Torvalds &devstat); 452315b7336eSAlan Stern if (status) { 45241da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 45251da177e4SLinus Torvalds goto loop_disable; 45261da177e4SLinus Torvalds } 45271da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 45281da177e4SLinus Torvalds dev_err(&udev->dev, 45291da177e4SLinus Torvalds "can't connect bus-powered hub " 45301da177e4SLinus Torvalds "to this port\n"); 45311da177e4SLinus Torvalds if (hub->has_indicators) { 45321da177e4SLinus Torvalds hub->indicator[port1-1] = 45331da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 4534c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 45351da177e4SLinus Torvalds } 45361da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 45371da177e4SLinus Torvalds goto loop_disable; 45381da177e4SLinus Torvalds } 45391da177e4SLinus Torvalds } 45401da177e4SLinus Torvalds 45411da177e4SLinus Torvalds /* check for devices running slower than they could */ 45421da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 45431da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 45441da177e4SLinus Torvalds && highspeed_hubs != 0) 45451da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 45461da177e4SLinus Torvalds 4547fa286188SGreg Kroah-Hartman /* Store the parent's children[] pointer. At this point 45481da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 45491da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 45501da177e4SLinus Torvalds */ 45511da177e4SLinus Torvalds status = 0; 45521da177e4SLinus Torvalds 45531da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 45541da177e4SLinus Torvalds * been disconnected; we would race with the 45551da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 45561da177e4SLinus Torvalds */ 45571da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 45581da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 45591da177e4SLinus Torvalds status = -ENOTCONN; 45601da177e4SLinus Torvalds else 4561ff823c79SLan Tianyu hub->ports[port1 - 1]->child = udev; 45621da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 45631da177e4SLinus Torvalds 45641da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 45651da177e4SLinus Torvalds if (!status) { 45661da177e4SLinus Torvalds status = usb_new_device(udev); 45671da177e4SLinus Torvalds if (status) { 45681da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 4569ff823c79SLan Tianyu hub->ports[port1 - 1]->child = NULL; 45701da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 45711da177e4SLinus Torvalds } 45721da177e4SLinus Torvalds } 45731da177e4SLinus Torvalds 45741da177e4SLinus Torvalds if (status) 45751da177e4SLinus Torvalds goto loop_disable; 45761da177e4SLinus Torvalds 45771da177e4SLinus Torvalds status = hub_power_remaining(hub); 45781da177e4SLinus Torvalds if (status) 457955c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 45801da177e4SLinus Torvalds 45811da177e4SLinus Torvalds return; 45821da177e4SLinus Torvalds 45831da177e4SLinus Torvalds loop_disable: 45841da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 45851da177e4SLinus Torvalds loop: 4586fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 45873b29b68bSAlan Stern release_devnum(udev); 4588f7410cedSHerbert Xu hub_free_dev(udev); 45891da177e4SLinus Torvalds usb_put_dev(udev); 4590ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 45911da177e4SLinus Torvalds break; 45921da177e4SLinus Torvalds } 45933a31155cSAlan Stern if (hub->hdev->parent || 45943a31155cSAlan Stern !hcd->driver->port_handed_over || 4595e9e88fb7SAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) { 4596e9e88fb7SAlan Stern if (status != -ENOTCONN && status != -ENODEV) 45973a31155cSAlan Stern dev_err(hub_dev, "unable to enumerate USB device on port %d\n", 45983a31155cSAlan Stern port1); 4599e9e88fb7SAlan Stern } 46001da177e4SLinus Torvalds 46011da177e4SLinus Torvalds done: 46021da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 460390da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 460490da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 46051da177e4SLinus Torvalds } 46061da177e4SLinus Torvalds 4607714b07beSSarah Sharp /* Returns 1 if there was a remote wakeup and a connect status change. */ 4608714b07beSSarah Sharp static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 460972937e1eSSarah Sharp u16 portstatus, u16 portchange) 4610714b07beSSarah Sharp { 4611714b07beSSarah Sharp struct usb_device *hdev; 4612714b07beSSarah Sharp struct usb_device *udev; 4613714b07beSSarah Sharp int connect_change = 0; 4614714b07beSSarah Sharp int ret; 4615714b07beSSarah Sharp 4616714b07beSSarah Sharp hdev = hub->hdev; 4617ff823c79SLan Tianyu udev = hub->ports[port - 1]->child; 46184ee823b8SSarah Sharp if (!hub_is_superspeed(hdev)) { 4619714b07beSSarah Sharp if (!(portchange & USB_PORT_STAT_C_SUSPEND)) 4620714b07beSSarah Sharp return 0; 4621ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); 46224ee823b8SSarah Sharp } else { 46234ee823b8SSarah Sharp if (!udev || udev->state != USB_STATE_SUSPENDED || 462472937e1eSSarah Sharp (portstatus & USB_PORT_STAT_LINK_STATE) != 462572937e1eSSarah Sharp USB_SS_PORT_LS_U0) 46264ee823b8SSarah Sharp return 0; 46274ee823b8SSarah Sharp } 4628714b07beSSarah Sharp 4629714b07beSSarah Sharp if (udev) { 4630714b07beSSarah Sharp /* TRSMRCY = 10 msec */ 4631714b07beSSarah Sharp msleep(10); 4632714b07beSSarah Sharp 4633714b07beSSarah Sharp usb_lock_device(udev); 4634714b07beSSarah Sharp ret = usb_remote_wakeup(udev); 4635714b07beSSarah Sharp usb_unlock_device(udev); 4636714b07beSSarah Sharp if (ret < 0) 4637714b07beSSarah Sharp connect_change = 1; 4638714b07beSSarah Sharp } else { 4639714b07beSSarah Sharp ret = -ENODEV; 4640714b07beSSarah Sharp hub_port_disable(hub, port, 1); 4641714b07beSSarah Sharp } 4642714b07beSSarah Sharp dev_dbg(hub->intfdev, "resume on port %d, status %d\n", 4643714b07beSSarah Sharp port, ret); 4644714b07beSSarah Sharp return connect_change; 4645714b07beSSarah Sharp } 4646714b07beSSarah Sharp 46471da177e4SLinus Torvalds static void hub_events(void) 46481da177e4SLinus Torvalds { 46491da177e4SLinus Torvalds struct list_head *tmp; 46501da177e4SLinus Torvalds struct usb_device *hdev; 46511da177e4SLinus Torvalds struct usb_interface *intf; 46521da177e4SLinus Torvalds struct usb_hub *hub; 46531da177e4SLinus Torvalds struct device *hub_dev; 46541da177e4SLinus Torvalds u16 hubstatus; 46551da177e4SLinus Torvalds u16 hubchange; 46561da177e4SLinus Torvalds u16 portstatus; 46571da177e4SLinus Torvalds u16 portchange; 46581da177e4SLinus Torvalds int i, ret; 46594ee823b8SSarah Sharp int connect_change, wakeup_change; 46601da177e4SLinus Torvalds 46611da177e4SLinus Torvalds /* 46621da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 46631da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 46641da177e4SLinus Torvalds * safe since we delete the hub from the event list. 46651da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 46661da177e4SLinus Torvalds */ 46671da177e4SLinus Torvalds while (1) { 46681da177e4SLinus Torvalds 46691da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 46701da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 46711da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 46721da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 46731da177e4SLinus Torvalds break; 46741da177e4SLinus Torvalds } 46751da177e4SLinus Torvalds 46761da177e4SLinus Torvalds tmp = hub_event_list.next; 46771da177e4SLinus Torvalds list_del_init(tmp); 46781da177e4SLinus Torvalds 46791da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 4680e8054854SAlan Stern kref_get(&hub->kref); 4681e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 46821da177e4SLinus Torvalds 4683e8054854SAlan Stern hdev = hub->hdev; 4684e8054854SAlan Stern hub_dev = hub->intfdev; 4685e8054854SAlan Stern intf = to_usb_interface(hub_dev); 468640f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 46873bbc47d8SKrzysztof Mazur hdev->state, hdev->maxchild, 46881da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 46891da177e4SLinus Torvalds (u16) hub->change_bits[0], 469040f122f3SAlan Stern (u16) hub->event_bits[0]); 46911da177e4SLinus Torvalds 46921da177e4SLinus Torvalds /* Lock the device, then check to see if we were 46931da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 469406b84e8aSAlan Stern usb_lock_device(hdev); 4695e8054854SAlan Stern if (unlikely(hub->disconnected)) 46969bbdf1e0SAlan Stern goto loop_disconnected; 46971da177e4SLinus Torvalds 46981da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 46991da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 47007de18d8bSAlan Stern hub->error = -ENODEV; 47014330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 47021da177e4SLinus Torvalds goto loop; 47031da177e4SLinus Torvalds } 47041da177e4SLinus Torvalds 470540f122f3SAlan Stern /* Autoresume */ 470640f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 470740f122f3SAlan Stern if (ret) { 470840f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 47091da177e4SLinus Torvalds goto loop; 471040f122f3SAlan Stern } 471140f122f3SAlan Stern 471240f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 471340f122f3SAlan Stern if (hub->quiescing) 471440f122f3SAlan Stern goto loop_autopm; 47151da177e4SLinus Torvalds 47161da177e4SLinus Torvalds if (hub->error) { 47171da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 47181da177e4SLinus Torvalds hub->error); 47191da177e4SLinus Torvalds 4720742120c6SMing Lei ret = usb_reset_device(hdev); 47211da177e4SLinus Torvalds if (ret) { 47221da177e4SLinus Torvalds dev_dbg (hub_dev, 47231da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 472440f122f3SAlan Stern goto loop_autopm; 47251da177e4SLinus Torvalds } 47261da177e4SLinus Torvalds 47271da177e4SLinus Torvalds hub->nerrors = 0; 47281da177e4SLinus Torvalds hub->error = 0; 47291da177e4SLinus Torvalds } 47301da177e4SLinus Torvalds 47311da177e4SLinus Torvalds /* deal with port status changes */ 47323bbc47d8SKrzysztof Mazur for (i = 1; i <= hdev->maxchild; i++) { 47331da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 47341da177e4SLinus Torvalds continue; 47351da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 473672937e1eSSarah Sharp wakeup_change = test_and_clear_bit(i, hub->wakeup_bits); 47371da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 47384ee823b8SSarah Sharp !connect_change && !wakeup_change) 47391da177e4SLinus Torvalds continue; 47401da177e4SLinus Torvalds 47411da177e4SLinus Torvalds ret = hub_port_status(hub, i, 47421da177e4SLinus Torvalds &portstatus, &portchange); 47431da177e4SLinus Torvalds if (ret < 0) 47441da177e4SLinus Torvalds continue; 47451da177e4SLinus Torvalds 47461da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 4747ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47481da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 47491da177e4SLinus Torvalds connect_change = 1; 47501da177e4SLinus Torvalds } 47511da177e4SLinus Torvalds 47521da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 47531da177e4SLinus Torvalds if (!connect_change) 47541da177e4SLinus Torvalds dev_dbg (hub_dev, 47551da177e4SLinus Torvalds "port %d enable change, " 47561da177e4SLinus Torvalds "status %08x\n", 47571da177e4SLinus Torvalds i, portstatus); 4758ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47591da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 47601da177e4SLinus Torvalds 47611da177e4SLinus Torvalds /* 47621da177e4SLinus Torvalds * EM interference sometimes causes badly 47631da177e4SLinus Torvalds * shielded USB devices to be shutdown by 47641da177e4SLinus Torvalds * the hub, this hack enables them again. 47651da177e4SLinus Torvalds * Works at least with mouse driver. 47661da177e4SLinus Torvalds */ 47671da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 47681da177e4SLinus Torvalds && !connect_change 4769ff823c79SLan Tianyu && hub->ports[i - 1]->child) { 47701da177e4SLinus Torvalds dev_err (hub_dev, 47711da177e4SLinus Torvalds "port %i " 47721da177e4SLinus Torvalds "disabled by hub (EMI?), " 47731da177e4SLinus Torvalds "re-enabling...\n", 47741da177e4SLinus Torvalds i); 47751da177e4SLinus Torvalds connect_change = 1; 47761da177e4SLinus Torvalds } 47771da177e4SLinus Torvalds } 47781da177e4SLinus Torvalds 477972937e1eSSarah Sharp if (hub_handle_remote_wakeup(hub, i, 478072937e1eSSarah Sharp portstatus, portchange)) 47811da177e4SLinus Torvalds connect_change = 1; 47821da177e4SLinus Torvalds 47831da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 4784752d57a8SPaul Bolle u16 status = 0; 4785752d57a8SPaul Bolle u16 unused; 4786752d57a8SPaul Bolle 4787752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change on port " 4788752d57a8SPaul Bolle "%d\n", i); 4789ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47901da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 4791752d57a8SPaul Bolle msleep(100); /* Cool down */ 47928520f380SAlan Stern hub_power_on(hub, true); 4793752d57a8SPaul Bolle hub_port_status(hub, i, &status, &unused); 4794752d57a8SPaul Bolle if (status & USB_PORT_STAT_OVERCURRENT) 4795752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 4796752d57a8SPaul Bolle "condition on port %d\n", i); 47971da177e4SLinus Torvalds } 47981da177e4SLinus Torvalds 47991da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 48001da177e4SLinus Torvalds dev_dbg (hub_dev, 48011da177e4SLinus Torvalds "reset change on port %d\n", 48021da177e4SLinus Torvalds i); 4803ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 48041da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 48051da177e4SLinus Torvalds } 4806c7061574SSarah Sharp if ((portchange & USB_PORT_STAT_C_BH_RESET) && 4807c7061574SSarah Sharp hub_is_superspeed(hub->hdev)) { 4808c7061574SSarah Sharp dev_dbg(hub_dev, 4809c7061574SSarah Sharp "warm reset change on port %d\n", 4810c7061574SSarah Sharp i); 4811ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 4812c7061574SSarah Sharp USB_PORT_FEAT_C_BH_PORT_RESET); 4813c7061574SSarah Sharp } 4814dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_LINK_STATE) { 4815ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, i, 4816dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_LINK_STATE); 4817dbe79bbeSJohn Youn } 4818dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 4819dbe79bbeSJohn Youn dev_warn(hub_dev, 4820dbe79bbeSJohn Youn "config error on port %d\n", 4821dbe79bbeSJohn Youn i); 4822ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, i, 4823dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 4824dbe79bbeSJohn Youn } 48251da177e4SLinus Torvalds 48265e467f6eSAndiry Xu /* Warm reset a USB3 protocol port if it's in 48275e467f6eSAndiry Xu * SS.Inactive state. 48285e467f6eSAndiry Xu */ 48298bea2bd3SStanislaw Ledwon if (hub_port_warm_reset_required(hub, portstatus)) { 483065bdac5eSSarah Sharp int status; 4831d3b9d7a9SSarah Sharp struct usb_device *udev = 4832d3b9d7a9SSarah Sharp hub->ports[i - 1]->child; 483365bdac5eSSarah Sharp 48345e467f6eSAndiry Xu dev_dbg(hub_dev, "warm reset port %d\n", i); 48352d51f3cdSJulius Werner if (!udev || 48362d51f3cdSJulius Werner !(portstatus & USB_PORT_STAT_CONNECTION) || 48372d51f3cdSJulius Werner udev->state == USB_STATE_NOTATTACHED) { 4838d3b9d7a9SSarah Sharp status = hub_port_reset(hub, i, 4839d3b9d7a9SSarah Sharp NULL, HUB_BH_RESET_TIME, 4840d3b9d7a9SSarah Sharp true); 484165bdac5eSSarah Sharp if (status < 0) 484265bdac5eSSarah Sharp hub_port_disable(hub, i, 1); 4843d3b9d7a9SSarah Sharp } else { 4844d3b9d7a9SSarah Sharp usb_lock_device(udev); 4845d3b9d7a9SSarah Sharp status = usb_reset_device(udev); 4846d3b9d7a9SSarah Sharp usb_unlock_device(udev); 484765bdac5eSSarah Sharp connect_change = 0; 48485e467f6eSAndiry Xu } 4849f3e94aa1SJulius Werner } 48505e467f6eSAndiry Xu 48511da177e4SLinus Torvalds if (connect_change) 48521da177e4SLinus Torvalds hub_port_connect_change(hub, i, 48531da177e4SLinus Torvalds portstatus, portchange); 48541da177e4SLinus Torvalds } /* end for i */ 48551da177e4SLinus Torvalds 48561da177e4SLinus Torvalds /* deal with hub status changes */ 48571da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 48581da177e4SLinus Torvalds ; /* do nothing */ 48591da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 48601da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 48611da177e4SLinus Torvalds else { 48621da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 48631da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 48641da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 486555c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 486655c52718SAlan Stern /* FIXME: Is this always true? */ 486755c52718SAlan Stern hub->limited_power = 1; 4868403fae78Sjidong xiao else 4869403fae78Sjidong xiao hub->limited_power = 0; 48701da177e4SLinus Torvalds } 48711da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 4872752d57a8SPaul Bolle u16 status = 0; 4873752d57a8SPaul Bolle u16 unused; 4874752d57a8SPaul Bolle 4875752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 48761da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 4877752d57a8SPaul Bolle msleep(500); /* Cool down */ 48788520f380SAlan Stern hub_power_on(hub, true); 4879752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 4880752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 4881752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 4882752d57a8SPaul Bolle "condition\n"); 48831da177e4SLinus Torvalds } 48841da177e4SLinus Torvalds } 48851da177e4SLinus Torvalds 488640f122f3SAlan Stern loop_autopm: 48878e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 48888e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 48891da177e4SLinus Torvalds loop: 48908e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface_no_resume() in 48918e4ceb38SAlan Stern * kick_khubd() and allow autosuspend. 48928e4ceb38SAlan Stern */ 48938e4ceb38SAlan Stern usb_autopm_put_interface(intf); 48949bbdf1e0SAlan Stern loop_disconnected: 48951da177e4SLinus Torvalds usb_unlock_device(hdev); 4896e8054854SAlan Stern kref_put(&hub->kref, hub_release); 48971da177e4SLinus Torvalds 48981da177e4SLinus Torvalds } /* end while (1) */ 48991da177e4SLinus Torvalds } 49001da177e4SLinus Torvalds 49011da177e4SLinus Torvalds static int hub_thread(void *__unused) 49021da177e4SLinus Torvalds { 49033bb1af52SAlan Stern /* khubd needs to be freezable to avoid intefering with USB-PERSIST 49043bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 49053bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 49063bb1af52SAlan Stern * the companion full-speed controller. 49073bb1af52SAlan Stern */ 490883144186SRafael J. Wysocki set_freezable(); 49093bb1af52SAlan Stern 49101da177e4SLinus Torvalds do { 49111da177e4SLinus Torvalds hub_events(); 4912e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 49139c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 49149c8d6178Sakpm@osdl.org kthread_should_stop()); 49159c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 49161da177e4SLinus Torvalds 49171da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 49189c8d6178Sakpm@osdl.org return 0; 49191da177e4SLinus Torvalds } 49201da177e4SLinus Torvalds 49211e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 4922e6f30deaSMing Lei { .match_flags = USB_DEVICE_ID_MATCH_VENDOR 4923e6f30deaSMing Lei | USB_DEVICE_ID_MATCH_INT_CLASS, 4924e6f30deaSMing Lei .idVendor = USB_VENDOR_GENESYS_LOGIC, 4925e6f30deaSMing Lei .bInterfaceClass = USB_CLASS_HUB, 4926e6f30deaSMing Lei .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, 49271da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 49281da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 49291da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 49301da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 49311da177e4SLinus Torvalds { } /* Terminating entry */ 49321da177e4SLinus Torvalds }; 49331da177e4SLinus Torvalds 49341da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 49351da177e4SLinus Torvalds 49361da177e4SLinus Torvalds static struct usb_driver hub_driver = { 49371da177e4SLinus Torvalds .name = "hub", 49381da177e4SLinus Torvalds .probe = hub_probe, 49391da177e4SLinus Torvalds .disconnect = hub_disconnect, 49401da177e4SLinus Torvalds .suspend = hub_suspend, 49411da177e4SLinus Torvalds .resume = hub_resume, 4942f07600cfSAlan Stern .reset_resume = hub_reset_resume, 49437de18d8bSAlan Stern .pre_reset = hub_pre_reset, 49447de18d8bSAlan Stern .post_reset = hub_post_reset, 4945c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 49461da177e4SLinus Torvalds .id_table = hub_id_table, 494740f122f3SAlan Stern .supports_autosuspend = 1, 49481da177e4SLinus Torvalds }; 49491da177e4SLinus Torvalds 49501da177e4SLinus Torvalds int usb_hub_init(void) 49511da177e4SLinus Torvalds { 49521da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 49531da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 49541da177e4SLinus Torvalds usbcore_name); 49551da177e4SLinus Torvalds return -1; 49561da177e4SLinus Torvalds } 49571da177e4SLinus Torvalds 49589c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 49599c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 49601da177e4SLinus Torvalds return 0; 49611da177e4SLinus Torvalds 49621da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 49631da177e4SLinus Torvalds usb_deregister(&hub_driver); 49641da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 49651da177e4SLinus Torvalds 49661da177e4SLinus Torvalds return -1; 49671da177e4SLinus Torvalds } 49681da177e4SLinus Torvalds 49691da177e4SLinus Torvalds void usb_hub_cleanup(void) 49701da177e4SLinus Torvalds { 49719c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 49721da177e4SLinus Torvalds 49731da177e4SLinus Torvalds /* 49741da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 49751da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 49761da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 49771da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 49781da177e4SLinus Torvalds * individual hub resources. -greg 49791da177e4SLinus Torvalds */ 49801da177e4SLinus Torvalds usb_deregister(&hub_driver); 49811da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 49821da177e4SLinus Torvalds 4983eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 4984e3376d6cSXenia Ragiadakou struct usb_device_descriptor *old_device_descriptor, 4985e3376d6cSXenia Ragiadakou struct usb_host_bos *old_bos) 49861da177e4SLinus Torvalds { 4987eb764c4bSAlan Stern int changed = 0; 49881da177e4SLinus Torvalds unsigned index; 4989eb764c4bSAlan Stern unsigned serial_len = 0; 4990eb764c4bSAlan Stern unsigned len; 4991eb764c4bSAlan Stern unsigned old_length; 4992eb764c4bSAlan Stern int length; 4993eb764c4bSAlan Stern char *buf; 49941da177e4SLinus Torvalds 4995eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 4996eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 4997eb764c4bSAlan Stern return 1; 4998eb764c4bSAlan Stern 4999e3376d6cSXenia Ragiadakou if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) 5000e3376d6cSXenia Ragiadakou return 1; 5001e3376d6cSXenia Ragiadakou if (udev->bos) { 5002b9a10481SXenia Ragiadakou len = le16_to_cpu(udev->bos->desc->wTotalLength); 5003b9a10481SXenia Ragiadakou if (len != le16_to_cpu(old_bos->desc->wTotalLength)) 5004e3376d6cSXenia Ragiadakou return 1; 5005b9a10481SXenia Ragiadakou if (memcmp(udev->bos->desc, old_bos->desc, len)) 5006e3376d6cSXenia Ragiadakou return 1; 5007e3376d6cSXenia Ragiadakou } 5008e3376d6cSXenia Ragiadakou 5009eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 5010eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 5011eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 5012eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 5013eb764c4bSAlan Stern * different flash card of the same brand). 5014eb764c4bSAlan Stern */ 5015eb764c4bSAlan Stern if (udev->serial) 5016eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 5017eb764c4bSAlan Stern 5018eb764c4bSAlan Stern len = serial_len; 50191da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5020eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 5021eb764c4bSAlan Stern len = max(len, old_length); 50221da177e4SLinus Torvalds } 5023eb764c4bSAlan Stern 50240cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 50251da177e4SLinus Torvalds if (buf == NULL) { 50261da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 50271da177e4SLinus Torvalds /* assume the worst */ 50281da177e4SLinus Torvalds return 1; 50291da177e4SLinus Torvalds } 50301da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5031eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 50321da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 50331da177e4SLinus Torvalds old_length); 5034eb764c4bSAlan Stern if (length != old_length) { 50351da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 50361da177e4SLinus Torvalds index, length); 5037eb764c4bSAlan Stern changed = 1; 50381da177e4SLinus Torvalds break; 50391da177e4SLinus Torvalds } 50401da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 50411da177e4SLinus Torvalds != 0) { 50421da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 5043eb764c4bSAlan Stern index, 5044eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 5045eb764c4bSAlan Stern bConfigurationValue); 5046eb764c4bSAlan Stern changed = 1; 50471da177e4SLinus Torvalds break; 50481da177e4SLinus Torvalds } 50491da177e4SLinus Torvalds } 5050eb764c4bSAlan Stern 5051eb764c4bSAlan Stern if (!changed && serial_len) { 5052eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 5053eb764c4bSAlan Stern buf, serial_len); 5054eb764c4bSAlan Stern if (length + 1 != serial_len) { 5055eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 5056eb764c4bSAlan Stern length); 5057eb764c4bSAlan Stern changed = 1; 5058eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 5059eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 5060eb764c4bSAlan Stern changed = 1; 5061eb764c4bSAlan Stern } 5062eb764c4bSAlan Stern } 5063eb764c4bSAlan Stern 50641da177e4SLinus Torvalds kfree(buf); 5065eb764c4bSAlan Stern return changed; 50661da177e4SLinus Torvalds } 50671da177e4SLinus Torvalds 50681da177e4SLinus Torvalds /** 5069742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 50701da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 50711da177e4SLinus Torvalds * 507279efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 507379efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 5074742120c6SMing Lei * Use usb_reset_device() instead. 50751da177e4SLinus Torvalds * 50761da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 50771da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 50781da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 50791da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 50801da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 50811da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 50821da177e4SLinus Torvalds * re-enumerated and probed all over again. 50831da177e4SLinus Torvalds * 5084626f090cSYacine Belkadi * Return: 0 if the reset succeeded, -ENODEV if the device has been 50851da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 50861da177e4SLinus Torvalds * if the reset wasn't even attempted. 50871da177e4SLinus Torvalds * 5088626f090cSYacine Belkadi * Note: 50891da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 50901da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 50911da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 50921da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 50936bc6cff5SAlan Stern * 50946bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 50956bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 50966bc6cff5SAlan Stern * holding the device lock because these tasks should always call 50976bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 50981da177e4SLinus Torvalds */ 5099742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 51001da177e4SLinus Torvalds { 51011da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 51021da177e4SLinus Torvalds struct usb_hub *parent_hub; 51033f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 51041da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 5105e3376d6cSXenia Ragiadakou struct usb_host_bos *bos; 510612c3da34SAlan Stern int i, ret = 0; 510712c3da34SAlan Stern int port1 = udev->portnum; 51081da177e4SLinus Torvalds 51091da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 51101da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 51111da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 51121da177e4SLinus Torvalds udev->state); 51131da177e4SLinus Torvalds return -EINVAL; 51141da177e4SLinus Torvalds } 51151da177e4SLinus Torvalds 51161da177e4SLinus Torvalds if (!parent_hdev) { 51174bec9917SWolfram Sang /* this requires hcd-specific logic; see ohci_restart() */ 5118441b62c1SHarvey Harrison dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 51191da177e4SLinus Torvalds return -EISDIR; 51201da177e4SLinus Torvalds } 5121ad493e5eSLan Tianyu parent_hub = usb_hub_to_struct_hub(parent_hdev); 51221da177e4SLinus Torvalds 5123dcc01c08SSarah Sharp /* Disable USB2 hardware LPM. 5124dcc01c08SSarah Sharp * It will be re-enabled by the enumeration process. 5125dcc01c08SSarah Sharp */ 5126dcc01c08SSarah Sharp if (udev->usb2_hw_lpm_enabled == 1) 5127dcc01c08SSarah Sharp usb_set_usb2_hardware_lpm(udev, 0); 5128dcc01c08SSarah Sharp 5129e3376d6cSXenia Ragiadakou bos = udev->bos; 5130e3376d6cSXenia Ragiadakou udev->bos = NULL; 5131e3376d6cSXenia Ragiadakou 5132f74631e3SSarah Sharp /* Disable LPM and LTM while we reset the device and reinstall the alt 5133f74631e3SSarah Sharp * settings. Device-initiated LPM settings, and system exit latency 5134f74631e3SSarah Sharp * settings are cleared when the device is reset, so we have to set 5135f74631e3SSarah Sharp * them up again. 51366d1d0513SSarah Sharp */ 51376d1d0513SSarah Sharp ret = usb_unlocked_disable_lpm(udev); 51386d1d0513SSarah Sharp if (ret) { 51396d1d0513SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); 51406d1d0513SSarah Sharp goto re_enumerate; 51416d1d0513SSarah Sharp } 5142f74631e3SSarah Sharp ret = usb_disable_ltm(udev); 5143f74631e3SSarah Sharp if (ret) { 5144f74631e3SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LTM\n.", 5145f74631e3SSarah Sharp __func__); 5146f74631e3SSarah Sharp goto re_enumerate; 5147f74631e3SSarah Sharp } 51486d1d0513SSarah Sharp 51491da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 51501da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 51511da177e4SLinus Torvalds 51521da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 51531da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 5154fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 51551da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 5156dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 51571da177e4SLinus Torvalds break; 51581da177e4SLinus Torvalds } 51591da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 5160d5cbad4bSAlan Stern 51611da177e4SLinus Torvalds if (ret < 0) 51621da177e4SLinus Torvalds goto re_enumerate; 51631da177e4SLinus Torvalds 51641da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 5165e3376d6cSXenia Ragiadakou if (descriptors_changed(udev, &descriptor, bos)) { 51661da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 51671da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 51681da177e4SLinus Torvalds goto re_enumerate; 51691da177e4SLinus Torvalds } 51701da177e4SLinus Torvalds 51714fe0387aSAlan Stern /* Restore the device's previous configuration */ 51721da177e4SLinus Torvalds if (!udev->actconfig) 51731da177e4SLinus Torvalds goto done; 51743f0479e0SSarah Sharp 5175d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 51763f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 51773f0479e0SSarah Sharp if (ret < 0) { 51783f0479e0SSarah Sharp dev_warn(&udev->dev, 51793f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 51803f0479e0SSarah Sharp "old configuration.\n"); 5181d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 51823f0479e0SSarah Sharp goto re_enumerate; 51833f0479e0SSarah Sharp } 51841da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 51851da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 51861da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 51871da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 51881da177e4SLinus Torvalds if (ret < 0) { 51891da177e4SLinus Torvalds dev_err(&udev->dev, 51901da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 51911da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 5192d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 51931da177e4SLinus Torvalds goto re_enumerate; 51941da177e4SLinus Torvalds } 5195d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 51961da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 51971da177e4SLinus Torvalds 51984fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 51994fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 52004fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 52014fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 52024fe0387aSAlan Stern * endpoint state. 52034fe0387aSAlan Stern */ 52041da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 52053f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 52063f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 52071da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 52081da177e4SLinus Torvalds 52091da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 52104fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 52114fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 52124fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 52134fe0387aSAlan Stern ret = 0; 52144fe0387aSAlan Stern } else { 521504a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 521604a723eaSSarah Sharp * device has been reset, and it will have to use 521704a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 52183f0479e0SSarah Sharp */ 521904a723eaSSarah Sharp intf->resetting_device = 1; 52201da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 52211da177e4SLinus Torvalds desc->bAlternateSetting); 522204a723eaSSarah Sharp intf->resetting_device = 0; 52234fe0387aSAlan Stern } 52241da177e4SLinus Torvalds if (ret < 0) { 52251da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 52261da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 52271da177e4SLinus Torvalds desc->bInterfaceNumber, 52281da177e4SLinus Torvalds desc->bAlternateSetting, 52291da177e4SLinus Torvalds ret); 52301da177e4SLinus Torvalds goto re_enumerate; 52311da177e4SLinus Torvalds } 52321da177e4SLinus Torvalds } 52331da177e4SLinus Torvalds 52341da177e4SLinus Torvalds done: 5235f74631e3SSarah Sharp /* Now that the alt settings are re-installed, enable LTM and LPM. */ 5236de68bab4SSarah Sharp usb_set_usb2_hardware_lpm(udev, 1); 523778d9a487SAlan Stern usb_unlocked_enable_lpm(udev); 5238f74631e3SSarah Sharp usb_enable_ltm(udev); 5239e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5240e3376d6cSXenia Ragiadakou udev->bos = bos; 52411da177e4SLinus Torvalds return 0; 52421da177e4SLinus Torvalds 52431da177e4SLinus Torvalds re_enumerate: 52446d1d0513SSarah Sharp /* LPM state doesn't matter when we're about to destroy the device. */ 52451da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 5246e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5247e3376d6cSXenia Ragiadakou udev->bos = bos; 52481da177e4SLinus Torvalds return -ENODEV; 52491da177e4SLinus Torvalds } 52501da177e4SLinus Torvalds 52511da177e4SLinus Torvalds /** 52521da177e4SLinus Torvalds * usb_reset_device - warn interface drivers and perform a USB port reset 52531da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 52541da177e4SLinus Torvalds * 525579efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 525679efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 5257742120c6SMing Lei * the reset is over (using their post_reset method). 525879efa097SAlan Stern * 5259626f090cSYacine Belkadi * Return: The same as for usb_reset_and_verify_device(). 526079efa097SAlan Stern * 5261626f090cSYacine Belkadi * Note: 526279efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 526379efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 526479efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 5265742120c6SMing Lei * the device using usb_lock_device_for_reset(). 526679efa097SAlan Stern * 526779efa097SAlan Stern * If an interface is currently being probed or disconnected, we assume 526879efa097SAlan Stern * its driver knows how to handle resets. For all other interfaces, 526979efa097SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 527079efa097SAlan Stern * we attempt to unbind it and rebind afterward. 527179efa097SAlan Stern */ 5272742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 527379efa097SAlan Stern { 527479efa097SAlan Stern int ret; 5275852c4b43SAlan Stern int i; 52764d769defSMing Lei unsigned int noio_flag; 527779efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 527879efa097SAlan Stern 527979efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 528079efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 528179efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 528279efa097SAlan Stern udev->state); 528379efa097SAlan Stern return -EINVAL; 528479efa097SAlan Stern } 528579efa097SAlan Stern 52864d769defSMing Lei /* 52874d769defSMing Lei * Don't allocate memory with GFP_KERNEL in current 52884d769defSMing Lei * context to avoid possible deadlock if usb mass 52894d769defSMing Lei * storage interface or usbnet interface(iSCSI case) 52904d769defSMing Lei * is included in current configuration. The easist 52914d769defSMing Lei * approach is to do it for every device reset, 52924d769defSMing Lei * because the device 'memalloc_noio' flag may have 52934d769defSMing Lei * not been set before reseting the usb device. 52944d769defSMing Lei */ 52954d769defSMing Lei noio_flag = memalloc_noio_save(); 52964d769defSMing Lei 5297645daaabSAlan Stern /* Prevent autosuspend during the reset */ 529894fcda1fSAlan Stern usb_autoresume_device(udev); 5299645daaabSAlan Stern 530079efa097SAlan Stern if (config) { 5301852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 5302852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 530379efa097SAlan Stern struct usb_driver *drv; 530478d9a487SAlan Stern int unbind = 0; 530579efa097SAlan Stern 5306852c4b43SAlan Stern if (cintf->dev.driver) { 530779efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 530878d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 530978d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 531078d9a487SAlan Stern else if (cintf->condition == 531178d9a487SAlan Stern USB_INTERFACE_BOUND) 531278d9a487SAlan Stern unbind = 1; 531378d9a487SAlan Stern if (unbind) 531478d9a487SAlan Stern usb_forced_unbind_intf(cintf); 531579efa097SAlan Stern } 531679efa097SAlan Stern } 531779efa097SAlan Stern } 531879efa097SAlan Stern 5319742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 532079efa097SAlan Stern 532179efa097SAlan Stern if (config) { 5322852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 5323852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 532479efa097SAlan Stern struct usb_driver *drv; 532578d9a487SAlan Stern int rebind = cintf->needs_binding; 532679efa097SAlan Stern 532778d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 532879efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 532979efa097SAlan Stern if (drv->post_reset) 533078d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 533178d9a487SAlan Stern else if (cintf->condition == 533278d9a487SAlan Stern USB_INTERFACE_BOUND) 533378d9a487SAlan Stern rebind = 1; 533479efa097SAlan Stern } 53356c640945SAlan Stern if (ret == 0 && rebind) 533678d9a487SAlan Stern usb_rebind_intf(cintf); 533779efa097SAlan Stern } 533879efa097SAlan Stern } 533979efa097SAlan Stern 534094fcda1fSAlan Stern usb_autosuspend_device(udev); 53414d769defSMing Lei memalloc_noio_restore(noio_flag); 534279efa097SAlan Stern return ret; 534379efa097SAlan Stern } 5344742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 5345dc023dceSInaky Perez-Gonzalez 5346dc023dceSInaky Perez-Gonzalez 5347dc023dceSInaky Perez-Gonzalez /** 5348dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 5349dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 5350dc023dceSInaky Perez-Gonzalez * 5351dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 5352dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 5353dc023dceSInaky Perez-Gonzalez * 5354dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 5355dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 5356dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 5357dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 5358dc023dceSInaky Perez-Gonzalez * 5359dc023dceSInaky Perez-Gonzalez * Corner cases: 5360dc023dceSInaky Perez-Gonzalez * 5361dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 5362dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 5363dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 5364dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 5365dc023dceSInaky Perez-Gonzalez * 5366dc023dceSInaky Perez-Gonzalez * - If a driver is unbound and it had a pending reset, the reset will 5367dc023dceSInaky Perez-Gonzalez * be cancelled. 5368dc023dceSInaky Perez-Gonzalez * 5369dc023dceSInaky Perez-Gonzalez * - This function can be called during .probe() or .disconnect() 5370dc023dceSInaky Perez-Gonzalez * times. On return from .disconnect(), any pending resets will be 5371dc023dceSInaky Perez-Gonzalez * cancelled. 5372dc023dceSInaky Perez-Gonzalez * 5373dc023dceSInaky Perez-Gonzalez * There is no no need to lock/unlock the @reset_ws as schedule_work() 5374dc023dceSInaky Perez-Gonzalez * does its own. 5375dc023dceSInaky Perez-Gonzalez * 5376dc023dceSInaky Perez-Gonzalez * NOTE: We don't do any reference count tracking because it is not 5377dc023dceSInaky Perez-Gonzalez * needed. The lifecycle of the work_struct is tied to the 5378dc023dceSInaky Perez-Gonzalez * usb_interface. Before destroying the interface we cancel the 5379dc023dceSInaky Perez-Gonzalez * work_struct, so the fact that work_struct is queued and or 5380dc023dceSInaky Perez-Gonzalez * running means the interface (and thus, the device) exist and 5381dc023dceSInaky Perez-Gonzalez * are referenced. 5382dc023dceSInaky Perez-Gonzalez */ 5383dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 5384dc023dceSInaky Perez-Gonzalez { 5385dc023dceSInaky Perez-Gonzalez schedule_work(&iface->reset_ws); 5386dc023dceSInaky Perez-Gonzalez } 5387dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 5388ff823c79SLan Tianyu 5389ff823c79SLan Tianyu /** 5390ff823c79SLan Tianyu * usb_hub_find_child - Get the pointer of child device 5391ff823c79SLan Tianyu * attached to the port which is specified by @port1. 5392ff823c79SLan Tianyu * @hdev: USB device belonging to the usb hub 5393ff823c79SLan Tianyu * @port1: port num to indicate which port the child device 5394ff823c79SLan Tianyu * is attached to. 5395ff823c79SLan Tianyu * 5396ff823c79SLan Tianyu * USB drivers call this function to get hub's child device 5397ff823c79SLan Tianyu * pointer. 5398ff823c79SLan Tianyu * 5399626f090cSYacine Belkadi * Return: %NULL if input param is invalid and 5400ff823c79SLan Tianyu * child's usb_device pointer if non-NULL. 5401ff823c79SLan Tianyu */ 5402ff823c79SLan Tianyu struct usb_device *usb_hub_find_child(struct usb_device *hdev, 5403ff823c79SLan Tianyu int port1) 5404ff823c79SLan Tianyu { 5405ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5406ff823c79SLan Tianyu 5407ff823c79SLan Tianyu if (port1 < 1 || port1 > hdev->maxchild) 5408ff823c79SLan Tianyu return NULL; 5409ff823c79SLan Tianyu return hub->ports[port1 - 1]->child; 5410ff823c79SLan Tianyu } 5411ff823c79SLan Tianyu EXPORT_SYMBOL_GPL(usb_hub_find_child); 5412d5575424SLan Tianyu 541305f91689SLan Tianyu /** 541405f91689SLan Tianyu * usb_set_hub_port_connect_type - set hub port connect type. 541505f91689SLan Tianyu * @hdev: USB device belonging to the usb hub 541605f91689SLan Tianyu * @port1: port num of the port 541705f91689SLan Tianyu * @type: connect type of the port 541805f91689SLan Tianyu */ 541905f91689SLan Tianyu void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1, 542005f91689SLan Tianyu enum usb_port_connect_type type) 542105f91689SLan Tianyu { 5422ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 542305f91689SLan Tianyu 542441341261SMathias Nyman if (hub) 542505f91689SLan Tianyu hub->ports[port1 - 1]->connect_type = type; 542605f91689SLan Tianyu } 542705f91689SLan Tianyu 542805f91689SLan Tianyu /** 542905f91689SLan Tianyu * usb_get_hub_port_connect_type - Get the port's connect type 543005f91689SLan Tianyu * @hdev: USB device belonging to the usb hub 543105f91689SLan Tianyu * @port1: port num of the port 543205f91689SLan Tianyu * 5433626f090cSYacine Belkadi * Return: The connect type of the port if successful. Or 5434626f090cSYacine Belkadi * USB_PORT_CONNECT_TYPE_UNKNOWN if input params are invalid. 543505f91689SLan Tianyu */ 543605f91689SLan Tianyu enum usb_port_connect_type 543705f91689SLan Tianyu usb_get_hub_port_connect_type(struct usb_device *hdev, int port1) 543805f91689SLan Tianyu { 5439ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 544005f91689SLan Tianyu 544141341261SMathias Nyman if (!hub) 544241341261SMathias Nyman return USB_PORT_CONNECT_TYPE_UNKNOWN; 544341341261SMathias Nyman 544405f91689SLan Tianyu return hub->ports[port1 - 1]->connect_type; 544505f91689SLan Tianyu } 544605f91689SLan Tianyu 5447d2123fd9SLan Tianyu void usb_hub_adjust_deviceremovable(struct usb_device *hdev, 5448d2123fd9SLan Tianyu struct usb_hub_descriptor *desc) 5449d2123fd9SLan Tianyu { 5450d2123fd9SLan Tianyu enum usb_port_connect_type connect_type; 5451d2123fd9SLan Tianyu int i; 5452d2123fd9SLan Tianyu 5453d2123fd9SLan Tianyu if (!hub_is_superspeed(hdev)) { 5454d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5455d2123fd9SLan Tianyu connect_type = usb_get_hub_port_connect_type(hdev, i); 5456d2123fd9SLan Tianyu 5457d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5458d2123fd9SLan Tianyu u8 mask = 1 << (i%8); 5459d2123fd9SLan Tianyu 5460d2123fd9SLan Tianyu if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { 5461d2123fd9SLan Tianyu dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", 5462d2123fd9SLan Tianyu i); 5463d2123fd9SLan Tianyu desc->u.hs.DeviceRemovable[i/8] |= mask; 5464d2123fd9SLan Tianyu } 5465d2123fd9SLan Tianyu } 5466d2123fd9SLan Tianyu } 5467d2123fd9SLan Tianyu } else { 5468d2123fd9SLan Tianyu u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); 5469d2123fd9SLan Tianyu 5470d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5471d2123fd9SLan Tianyu connect_type = usb_get_hub_port_connect_type(hdev, i); 5472d2123fd9SLan Tianyu 5473d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5474d2123fd9SLan Tianyu u16 mask = 1 << i; 5475d2123fd9SLan Tianyu 5476d2123fd9SLan Tianyu if (!(port_removable & mask)) { 5477d2123fd9SLan Tianyu dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", 5478d2123fd9SLan Tianyu i); 5479d2123fd9SLan Tianyu port_removable |= mask; 5480d2123fd9SLan Tianyu } 5481d2123fd9SLan Tianyu } 5482d2123fd9SLan Tianyu } 5483d2123fd9SLan Tianyu 5484d2123fd9SLan Tianyu desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); 5485d2123fd9SLan Tianyu } 5486d2123fd9SLan Tianyu } 5487d2123fd9SLan Tianyu 5488d5575424SLan Tianyu #ifdef CONFIG_ACPI 5489d5575424SLan Tianyu /** 5490d5575424SLan Tianyu * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle 5491d5575424SLan Tianyu * @hdev: USB device belonging to the usb hub 5492d5575424SLan Tianyu * @port1: port num of the port 5493d5575424SLan Tianyu * 5494626f090cSYacine Belkadi * Return: Port's acpi handle if successful, %NULL if params are 5495626f090cSYacine Belkadi * invalid. 5496d5575424SLan Tianyu */ 5497d5575424SLan Tianyu acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, 5498d5575424SLan Tianyu int port1) 5499d5575424SLan Tianyu { 5500ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5501d5575424SLan Tianyu 550241341261SMathias Nyman if (!hub) 550341341261SMathias Nyman return NULL; 550441341261SMathias Nyman 55053a83f992SRafael J. Wysocki return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); 5506d5575424SLan Tianyu } 5507d5575424SLan Tianyu #endif 5508