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 138d9b2099cSSarah Sharp static 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 } 15951e0a012SSarah Sharp if (udev->parent->lpm_capable) 16051e0a012SSarah Sharp return 1; 16151e0a012SSarah Sharp 16251e0a012SSarah Sharp dev_warn(&udev->dev, "Parent hub missing LPM exit latency info. " 16351e0a012SSarah Sharp "Power management will be impacted.\n"); 16451e0a012SSarah Sharp return 0; 16551e0a012SSarah Sharp } 16651e0a012SSarah Sharp 16751e0a012SSarah Sharp /* 16851e0a012SSarah Sharp * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from 16951e0a012SSarah Sharp * either U1 or U2. 17051e0a012SSarah Sharp */ 17151e0a012SSarah Sharp static void usb_set_lpm_mel(struct usb_device *udev, 17251e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 17351e0a012SSarah Sharp unsigned int udev_exit_latency, 17451e0a012SSarah Sharp struct usb_hub *hub, 17551e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 17651e0a012SSarah Sharp unsigned int hub_exit_latency) 17751e0a012SSarah Sharp { 17851e0a012SSarah Sharp unsigned int total_mel; 17951e0a012SSarah Sharp unsigned int device_mel; 18051e0a012SSarah Sharp unsigned int hub_mel; 18151e0a012SSarah Sharp 18251e0a012SSarah Sharp /* 18351e0a012SSarah Sharp * Calculate the time it takes to transition all links from the roothub 18451e0a012SSarah Sharp * to the parent hub into U0. The parent hub must then decode the 18551e0a012SSarah Sharp * packet (hub header decode latency) to figure out which port it was 18651e0a012SSarah Sharp * bound for. 18751e0a012SSarah Sharp * 18851e0a012SSarah Sharp * The Hub Header decode latency is expressed in 0.1us intervals (0x1 18951e0a012SSarah Sharp * means 0.1us). Multiply that by 100 to get nanoseconds. 19051e0a012SSarah Sharp */ 19151e0a012SSarah Sharp total_mel = hub_lpm_params->mel + 19251e0a012SSarah Sharp (hub->descriptor->u.ss.bHubHdrDecLat * 100); 19351e0a012SSarah Sharp 19451e0a012SSarah Sharp /* 19551e0a012SSarah Sharp * How long will it take to transition the downstream hub's port into 19651e0a012SSarah Sharp * U0? The greater of either the hub exit latency or the device exit 19751e0a012SSarah Sharp * latency. 19851e0a012SSarah Sharp * 19951e0a012SSarah Sharp * The BOS U1/U2 exit latencies are expressed in 1us intervals. 20051e0a012SSarah Sharp * Multiply that by 1000 to get nanoseconds. 20151e0a012SSarah Sharp */ 20251e0a012SSarah Sharp device_mel = udev_exit_latency * 1000; 20351e0a012SSarah Sharp hub_mel = hub_exit_latency * 1000; 20451e0a012SSarah Sharp if (device_mel > hub_mel) 20551e0a012SSarah Sharp total_mel += device_mel; 20651e0a012SSarah Sharp else 20751e0a012SSarah Sharp total_mel += hub_mel; 20851e0a012SSarah Sharp 20951e0a012SSarah Sharp udev_lpm_params->mel = total_mel; 21051e0a012SSarah Sharp } 21151e0a012SSarah Sharp 21251e0a012SSarah Sharp /* 21351e0a012SSarah Sharp * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate 21451e0a012SSarah Sharp * a transition from either U1 or U2. 21551e0a012SSarah Sharp */ 21651e0a012SSarah Sharp static void usb_set_lpm_pel(struct usb_device *udev, 21751e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 21851e0a012SSarah Sharp unsigned int udev_exit_latency, 21951e0a012SSarah Sharp struct usb_hub *hub, 22051e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 22151e0a012SSarah Sharp unsigned int hub_exit_latency, 22251e0a012SSarah Sharp unsigned int port_to_port_exit_latency) 22351e0a012SSarah Sharp { 22451e0a012SSarah Sharp unsigned int first_link_pel; 22551e0a012SSarah Sharp unsigned int hub_pel; 22651e0a012SSarah Sharp 22751e0a012SSarah Sharp /* 22851e0a012SSarah Sharp * First, the device sends an LFPS to transition the link between the 22951e0a012SSarah Sharp * device and the parent hub into U0. The exit latency is the bigger of 23051e0a012SSarah Sharp * the device exit latency or the hub exit latency. 23151e0a012SSarah Sharp */ 23251e0a012SSarah Sharp if (udev_exit_latency > hub_exit_latency) 23351e0a012SSarah Sharp first_link_pel = udev_exit_latency * 1000; 23451e0a012SSarah Sharp else 23551e0a012SSarah Sharp first_link_pel = hub_exit_latency * 1000; 23651e0a012SSarah Sharp 23751e0a012SSarah Sharp /* 23851e0a012SSarah Sharp * When the hub starts to receive the LFPS, there is a slight delay for 23951e0a012SSarah Sharp * it to figure out that one of the ports is sending an LFPS. Then it 24051e0a012SSarah Sharp * will forward the LFPS to its upstream link. The exit latency is the 24151e0a012SSarah Sharp * delay, plus the PEL that we calculated for this hub. 24251e0a012SSarah Sharp */ 24351e0a012SSarah Sharp hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; 24451e0a012SSarah Sharp 24551e0a012SSarah Sharp /* 24651e0a012SSarah Sharp * According to figure C-7 in the USB 3.0 spec, the PEL for this device 24751e0a012SSarah Sharp * is the greater of the two exit latencies. 24851e0a012SSarah Sharp */ 24951e0a012SSarah Sharp if (first_link_pel > hub_pel) 25051e0a012SSarah Sharp udev_lpm_params->pel = first_link_pel; 25151e0a012SSarah Sharp else 25251e0a012SSarah Sharp udev_lpm_params->pel = hub_pel; 25351e0a012SSarah Sharp } 25451e0a012SSarah Sharp 25551e0a012SSarah Sharp /* 25651e0a012SSarah Sharp * Set the System Exit Latency (SEL) to indicate the total worst-case time from 25751e0a012SSarah Sharp * when a device initiates a transition to U0, until when it will receive the 25851e0a012SSarah Sharp * first packet from the host controller. 25951e0a012SSarah Sharp * 26051e0a012SSarah Sharp * Section C.1.5.1 describes the four components to this: 26151e0a012SSarah Sharp * - t1: device PEL 26251e0a012SSarah Sharp * - t2: time for the ERDY to make it from the device to the host. 26351e0a012SSarah Sharp * - t3: a host-specific delay to process the ERDY. 26451e0a012SSarah Sharp * - t4: time for the packet to make it from the host to the device. 26551e0a012SSarah Sharp * 26651e0a012SSarah Sharp * t3 is specific to both the xHCI host and the platform the host is integrated 26751e0a012SSarah Sharp * into. The Intel HW folks have said it's negligible, FIXME if a different 26851e0a012SSarah Sharp * vendor says otherwise. 26951e0a012SSarah Sharp */ 27051e0a012SSarah Sharp static void usb_set_lpm_sel(struct usb_device *udev, 27151e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params) 27251e0a012SSarah Sharp { 27351e0a012SSarah Sharp struct usb_device *parent; 27451e0a012SSarah Sharp unsigned int num_hubs; 27551e0a012SSarah Sharp unsigned int total_sel; 27651e0a012SSarah Sharp 27751e0a012SSarah Sharp /* t1 = device PEL */ 27851e0a012SSarah Sharp total_sel = udev_lpm_params->pel; 27951e0a012SSarah Sharp /* How many external hubs are in between the device & the root port. */ 28051e0a012SSarah Sharp for (parent = udev->parent, num_hubs = 0; parent->parent; 28151e0a012SSarah Sharp parent = parent->parent) 28251e0a012SSarah Sharp num_hubs++; 28351e0a012SSarah Sharp /* t2 = 2.1us + 250ns * (num_hubs - 1) */ 28451e0a012SSarah Sharp if (num_hubs > 0) 28551e0a012SSarah Sharp total_sel += 2100 + 250 * (num_hubs - 1); 28651e0a012SSarah Sharp 28751e0a012SSarah Sharp /* t4 = 250ns * num_hubs */ 28851e0a012SSarah Sharp total_sel += 250 * num_hubs; 28951e0a012SSarah Sharp 29051e0a012SSarah Sharp udev_lpm_params->sel = total_sel; 29151e0a012SSarah Sharp } 29251e0a012SSarah Sharp 29351e0a012SSarah Sharp static void usb_set_lpm_parameters(struct usb_device *udev) 29451e0a012SSarah Sharp { 29551e0a012SSarah Sharp struct usb_hub *hub; 29651e0a012SSarah Sharp unsigned int port_to_port_delay; 29751e0a012SSarah Sharp unsigned int udev_u1_del; 29851e0a012SSarah Sharp unsigned int udev_u2_del; 29951e0a012SSarah Sharp unsigned int hub_u1_del; 30051e0a012SSarah Sharp unsigned int hub_u2_del; 30151e0a012SSarah Sharp 30251e0a012SSarah Sharp if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER) 30351e0a012SSarah Sharp return; 30451e0a012SSarah Sharp 305ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 30651e0a012SSarah Sharp /* It doesn't take time to transition the roothub into U0, since it 30751e0a012SSarah Sharp * doesn't have an upstream link. 30851e0a012SSarah Sharp */ 30951e0a012SSarah Sharp if (!hub) 31051e0a012SSarah Sharp return; 31151e0a012SSarah Sharp 31251e0a012SSarah Sharp udev_u1_del = udev->bos->ss_cap->bU1devExitLat; 31351e0a012SSarah Sharp udev_u2_del = udev->bos->ss_cap->bU2DevExitLat; 31451e0a012SSarah Sharp hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; 31551e0a012SSarah Sharp hub_u2_del = udev->parent->bos->ss_cap->bU2DevExitLat; 31651e0a012SSarah Sharp 31751e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, 31851e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del); 31951e0a012SSarah Sharp 32051e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, 32151e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del); 32251e0a012SSarah Sharp 32351e0a012SSarah Sharp /* 32451e0a012SSarah Sharp * Appendix C, section C.2.2.2, says that there is a slight delay from 32551e0a012SSarah Sharp * when the parent hub notices the downstream port is trying to 32651e0a012SSarah Sharp * transition to U0 to when the hub initiates a U0 transition on its 32751e0a012SSarah Sharp * upstream port. The section says the delays are tPort2PortU1EL and 32851e0a012SSarah Sharp * tPort2PortU2EL, but it doesn't define what they are. 32951e0a012SSarah Sharp * 33051e0a012SSarah Sharp * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking 33151e0a012SSarah Sharp * about the same delays. Use the maximum delay calculations from those 33251e0a012SSarah Sharp * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For 33351e0a012SSarah Sharp * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I 33451e0a012SSarah Sharp * assume the device exit latencies they are talking about are the hub 33551e0a012SSarah Sharp * exit latencies. 33651e0a012SSarah Sharp * 33751e0a012SSarah Sharp * What do we do if the U2 exit latency is less than the U1 exit 33851e0a012SSarah Sharp * latency? It's possible, although not likely... 33951e0a012SSarah Sharp */ 34051e0a012SSarah Sharp port_to_port_delay = 1; 34151e0a012SSarah Sharp 34251e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, 34351e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del, 34451e0a012SSarah Sharp port_to_port_delay); 34551e0a012SSarah Sharp 34651e0a012SSarah Sharp if (hub_u2_del > hub_u1_del) 34751e0a012SSarah Sharp port_to_port_delay = 1 + hub_u2_del - hub_u1_del; 34851e0a012SSarah Sharp else 34951e0a012SSarah Sharp port_to_port_delay = 1 + hub_u1_del; 35051e0a012SSarah Sharp 35151e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, 35251e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del, 35351e0a012SSarah Sharp port_to_port_delay); 35451e0a012SSarah Sharp 35551e0a012SSarah Sharp /* Now that we've got PEL, calculate SEL. */ 35651e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u1_params); 35751e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u2_params); 35851e0a012SSarah Sharp } 359d9b2099cSSarah Sharp 3601da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 361dbe79bbeSJohn Youn static int get_hub_descriptor(struct usb_device *hdev, void *data) 3621da177e4SLinus Torvalds { 363dbe79bbeSJohn Youn int i, ret, size; 364dbe79bbeSJohn Youn unsigned dtype; 365dbe79bbeSJohn Youn 366dbe79bbeSJohn Youn if (hub_is_superspeed(hdev)) { 367dbe79bbeSJohn Youn dtype = USB_DT_SS_HUB; 368dbe79bbeSJohn Youn size = USB_DT_SS_HUB_SIZE; 369dbe79bbeSJohn Youn } else { 370dbe79bbeSJohn Youn dtype = USB_DT_HUB; 371dbe79bbeSJohn Youn size = sizeof(struct usb_hub_descriptor); 372dbe79bbeSJohn Youn } 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 3751da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3761da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 377dbe79bbeSJohn Youn dtype << 8, 0, data, size, 3781da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 3791da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 3801da177e4SLinus Torvalds return ret; 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds return -EINVAL; 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds /* 3861da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 3871da177e4SLinus Torvalds */ 3881da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 3891da177e4SLinus Torvalds { 3901da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 3911da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 3921da177e4SLinus Torvalds } 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds /* 3951da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 3961da177e4SLinus Torvalds */ 397ad493e5eSLan Tianyu int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) 3981da177e4SLinus Torvalds { 3991da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4001da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 4011da177e4SLinus Torvalds NULL, 0, 1000); 4021da177e4SLinus Torvalds } 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds /* 4051da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 4061da177e4SLinus Torvalds */ 4071da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 4081da177e4SLinus Torvalds { 4091da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4101da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 4111da177e4SLinus Torvalds NULL, 0, 1000); 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds /* 4151da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 4161da177e4SLinus Torvalds * for info about using port indicators 4171da177e4SLinus Torvalds */ 4181da177e4SLinus Torvalds static void set_port_led( 4191da177e4SLinus Torvalds struct usb_hub *hub, 4201da177e4SLinus Torvalds int port1, 4211da177e4SLinus Torvalds int selector 4221da177e4SLinus Torvalds ) 4231da177e4SLinus Torvalds { 4241da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 4251da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 4261da177e4SLinus Torvalds if (status < 0) 4271da177e4SLinus Torvalds dev_dbg (hub->intfdev, 4281da177e4SLinus Torvalds "port %d indicator %s status %d\n", 4291da177e4SLinus Torvalds port1, 4301da177e4SLinus Torvalds ({ char *s; switch (selector) { 4311da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 4321da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 4331da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 4341da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 4351da177e4SLinus Torvalds default: s = "??"; break; 4361da177e4SLinus Torvalds }; s; }), 4371da177e4SLinus Torvalds status); 4381da177e4SLinus Torvalds } 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 4411da177e4SLinus Torvalds 442c4028958SDavid Howells static void led_work (struct work_struct *work) 4431da177e4SLinus Torvalds { 444c4028958SDavid Howells struct usb_hub *hub = 445c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 4461da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4471da177e4SLinus Torvalds unsigned i; 4481da177e4SLinus Torvalds unsigned changed = 0; 4491da177e4SLinus Torvalds int cursor = -1; 4501da177e4SLinus Torvalds 4511da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 4521da177e4SLinus Torvalds return; 4531da177e4SLinus Torvalds 4543bbc47d8SKrzysztof Mazur for (i = 0; i < hdev->maxchild; i++) { 4551da177e4SLinus Torvalds unsigned selector, mode; 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds /* 30%-50% duty cycle */ 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds switch (hub->indicator[i]) { 4601da177e4SLinus Torvalds /* cycle marker */ 4611da177e4SLinus Torvalds case INDICATOR_CYCLE: 4621da177e4SLinus Torvalds cursor = i; 4631da177e4SLinus Torvalds selector = HUB_LED_AUTO; 4641da177e4SLinus Torvalds mode = INDICATOR_AUTO; 4651da177e4SLinus Torvalds break; 4661da177e4SLinus Torvalds /* blinking green = sw attention */ 4671da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 4681da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4691da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 4701da177e4SLinus Torvalds break; 4711da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 4721da177e4SLinus Torvalds selector = HUB_LED_OFF; 4731da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 4741da177e4SLinus Torvalds break; 4751da177e4SLinus Torvalds /* blinking amber = hw attention */ 4761da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 4771da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4781da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 4791da177e4SLinus Torvalds break; 4801da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 4811da177e4SLinus Torvalds selector = HUB_LED_OFF; 4821da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 4831da177e4SLinus Torvalds break; 4841da177e4SLinus Torvalds /* blink green/amber = reserved */ 4851da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 4861da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4871da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 4881da177e4SLinus Torvalds break; 4891da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 4901da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4911da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 4921da177e4SLinus Torvalds break; 4931da177e4SLinus Torvalds default: 4941da177e4SLinus Torvalds continue; 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 4971da177e4SLinus Torvalds changed = 1; 4981da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 4991da177e4SLinus Torvalds hub->indicator[i] = mode; 5001da177e4SLinus Torvalds } 5011da177e4SLinus Torvalds if (!changed && blinkenlights) { 5021da177e4SLinus Torvalds cursor++; 5033bbc47d8SKrzysztof Mazur cursor %= hdev->maxchild; 5041da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 5051da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 5061da177e4SLinus Torvalds changed++; 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds if (changed) 5091da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 5101da177e4SLinus Torvalds } 5111da177e4SLinus Torvalds 5121da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 5131da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 5141da177e4SLinus Torvalds #define USB_STS_RETRIES 5 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds /* 5171da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 5181da177e4SLinus Torvalds */ 5191da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 5201da177e4SLinus Torvalds struct usb_hub_status *data) 5211da177e4SLinus Torvalds { 5221da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5231da177e4SLinus Torvalds 5243824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5253824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5261da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5271da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 5281da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds return status; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds /* 5341da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 5351da177e4SLinus Torvalds */ 5361da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 5371da177e4SLinus Torvalds struct usb_port_status *data) 5381da177e4SLinus Torvalds { 5391da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5401da177e4SLinus Torvalds 5413824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5423824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5431da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5441da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 5451da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5461da177e4SLinus Torvalds } 5471da177e4SLinus Torvalds return status; 5481da177e4SLinus Torvalds } 5491da177e4SLinus Torvalds 5503eb14915SAlan Stern static int hub_port_status(struct usb_hub *hub, int port1, 5513eb14915SAlan Stern u16 *status, u16 *change) 5523eb14915SAlan Stern { 5533eb14915SAlan Stern int ret; 5543eb14915SAlan Stern 5553eb14915SAlan Stern mutex_lock(&hub->status_mutex); 5563eb14915SAlan Stern ret = get_port_status(hub->hdev, port1, &hub->status->port); 5573eb14915SAlan Stern if (ret < 4) { 558e9e88fb7SAlan Stern if (ret != -ENODEV) 5593eb14915SAlan Stern dev_err(hub->intfdev, 5603eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 5613eb14915SAlan Stern if (ret >= 0) 5623eb14915SAlan Stern ret = -EIO; 5633eb14915SAlan Stern } else { 5643eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 5653eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 566dbe79bbeSJohn Youn 5673eb14915SAlan Stern ret = 0; 5683eb14915SAlan Stern } 5693eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 5703eb14915SAlan Stern return ret; 5713eb14915SAlan Stern } 5723eb14915SAlan Stern 5731da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 5741da177e4SLinus Torvalds { 5751da177e4SLinus Torvalds unsigned long flags; 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 5782e2c5eeaSRoel Kluin if (!hub->disconnected && list_empty(&hub->event_list)) { 5791da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 5808e4ceb38SAlan Stern 5818e4ceb38SAlan Stern /* Suppress autosuspend until khubd runs */ 5828e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 5838e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 5841da177e4SLinus Torvalds wake_up(&khubd_wait); 5851da177e4SLinus Torvalds } 5861da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 5901da177e4SLinus Torvalds { 591ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 59225118084SAlan Stern 59325118084SAlan Stern if (hub) 59425118084SAlan Stern kick_khubd(hub); 5951da177e4SLinus Torvalds } 5961da177e4SLinus Torvalds 5974ee823b8SSarah Sharp /* 5984ee823b8SSarah Sharp * Let the USB core know that a USB 3.0 device has sent a Function Wake Device 5994ee823b8SSarah Sharp * Notification, which indicates it had initiated remote wakeup. 6004ee823b8SSarah Sharp * 6014ee823b8SSarah Sharp * USB 3.0 hubs do not report the port link state change from U3 to U0 when the 6024ee823b8SSarah Sharp * device initiates resume, so the USB core will not receive notice of the 6034ee823b8SSarah Sharp * resume through the normal hub interrupt URB. 6044ee823b8SSarah Sharp */ 6054ee823b8SSarah Sharp void usb_wakeup_notification(struct usb_device *hdev, 6064ee823b8SSarah Sharp unsigned int portnum) 6074ee823b8SSarah Sharp { 6084ee823b8SSarah Sharp struct usb_hub *hub; 6094ee823b8SSarah Sharp 6104ee823b8SSarah Sharp if (!hdev) 6114ee823b8SSarah Sharp return; 6124ee823b8SSarah Sharp 613ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(hdev); 6144ee823b8SSarah Sharp if (hub) { 6154ee823b8SSarah Sharp set_bit(portnum, hub->wakeup_bits); 6164ee823b8SSarah Sharp kick_khubd(hub); 6174ee823b8SSarah Sharp } 6184ee823b8SSarah Sharp } 6194ee823b8SSarah Sharp EXPORT_SYMBOL_GPL(usb_wakeup_notification); 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 6227d12e780SDavid Howells static void hub_irq(struct urb *urb) 6231da177e4SLinus Torvalds { 624ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 625e015268dSAlan Stern int status = urb->status; 62671d2718fSRoel Kluin unsigned i; 6271da177e4SLinus Torvalds unsigned long bits; 6281da177e4SLinus Torvalds 629e015268dSAlan Stern switch (status) { 6301da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 6311da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 6321da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 6331da177e4SLinus Torvalds return; 6341da177e4SLinus Torvalds 6351da177e4SLinus Torvalds default: /* presumably an error */ 6361da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 637e015268dSAlan Stern dev_dbg (hub->intfdev, "transfer --> %d\n", status); 6381da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 6391da177e4SLinus Torvalds goto resubmit; 640e015268dSAlan Stern hub->error = status; 6411da177e4SLinus Torvalds /* FALL THROUGH */ 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds /* let khubd handle things */ 6441da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 6451da177e4SLinus Torvalds bits = 0; 6461da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 6471da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 6481da177e4SLinus Torvalds << (i*8); 6491da177e4SLinus Torvalds hub->event_bits[0] = bits; 6501da177e4SLinus Torvalds break; 6511da177e4SLinus Torvalds } 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds hub->nerrors = 0; 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 6561da177e4SLinus Torvalds kick_khubd(hub); 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds resubmit: 6591da177e4SLinus Torvalds if (hub->quiescing) 6601da177e4SLinus Torvalds return; 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 6631da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 6641da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 6651da177e4SLinus Torvalds } 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 6681da177e4SLinus Torvalds static inline int 6691da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 6701da177e4SLinus Torvalds { 6712c7b871bSWilliam Gulland /* Need to clear both directions for control ep */ 6722c7b871bSWilliam Gulland if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == 6732c7b871bSWilliam Gulland USB_ENDPOINT_XFER_CONTROL) { 6742c7b871bSWilliam Gulland int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 6752c7b871bSWilliam Gulland HUB_CLEAR_TT_BUFFER, USB_RT_PORT, 6762c7b871bSWilliam Gulland devinfo ^ 0x8000, tt, NULL, 0, 1000); 6772c7b871bSWilliam Gulland if (status) 6782c7b871bSWilliam Gulland return status; 6792c7b871bSWilliam Gulland } 680c2f6595fSAlan Stern return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 6811da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 6821da177e4SLinus Torvalds tt, NULL, 0, 1000); 6831da177e4SLinus Torvalds } 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds /* 6861da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 6871da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 6881da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 6891da177e4SLinus Torvalds * both can talk to the same hub concurrently. 6901da177e4SLinus Torvalds */ 691cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 6921da177e4SLinus Torvalds { 693c4028958SDavid Howells struct usb_hub *hub = 694cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 6951da177e4SLinus Torvalds unsigned long flags; 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 6983b6054daSOctavian Purdila while (!list_empty(&hub->tt.clear_list)) { 699d0f830d3SH Hartley Sweeten struct list_head *next; 7001da177e4SLinus Torvalds struct usb_tt_clear *clear; 7011da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 702cb88a1b8SAlan Stern const struct hc_driver *drv; 7031da177e4SLinus Torvalds int status; 7041da177e4SLinus Torvalds 705d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 706d0f830d3SH Hartley Sweeten clear = list_entry (next, struct usb_tt_clear, clear_list); 7071da177e4SLinus Torvalds list_del (&clear->clear_list); 7081da177e4SLinus Torvalds 7091da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 7101da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 7111da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 712e9e88fb7SAlan Stern if (status && status != -ENODEV) 7131da177e4SLinus Torvalds dev_err (&hdev->dev, 7141da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 7151da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 716cb88a1b8SAlan Stern 717cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 718cb88a1b8SAlan Stern drv = clear->hcd->driver; 719cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 720cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 721cb88a1b8SAlan Stern 7221da177e4SLinus Torvalds kfree(clear); 723cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 7241da177e4SLinus Torvalds } 7251da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 7261da177e4SLinus Torvalds } 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvalds /** 729971fcd49SLan Tianyu * usb_hub_set_port_power - control hub port's power state 73041341261SMathias Nyman * @hdev: USB device belonging to the usb hub 73141341261SMathias Nyman * @hub: target hub 732971fcd49SLan Tianyu * @port1: port index 733971fcd49SLan Tianyu * @set: expected status 734971fcd49SLan Tianyu * 735971fcd49SLan Tianyu * call this function to control port's power via setting or 736971fcd49SLan Tianyu * clearing the port's PORT_POWER feature. 737626f090cSYacine Belkadi * 738626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 739971fcd49SLan Tianyu */ 74041341261SMathias Nyman int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, 74141341261SMathias Nyman int port1, bool set) 742971fcd49SLan Tianyu { 743971fcd49SLan Tianyu int ret; 744ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[port1 - 1]; 745971fcd49SLan Tianyu 746971fcd49SLan Tianyu if (set) 747971fcd49SLan Tianyu ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 748971fcd49SLan Tianyu else 749ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 750ad493e5eSLan Tianyu 751ad493e5eSLan Tianyu if (!ret) 752ad493e5eSLan Tianyu port_dev->power_is_on = set; 753971fcd49SLan Tianyu return ret; 754971fcd49SLan Tianyu } 755971fcd49SLan Tianyu 756971fcd49SLan Tianyu /** 757cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 758cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 7591da177e4SLinus Torvalds * 7601da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 7611da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 7621da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 7631da177e4SLinus Torvalds * interrupt context. 7641da177e4SLinus Torvalds * 7651da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 7661da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 767626f090cSYacine Belkadi * 768626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 7691da177e4SLinus Torvalds */ 770cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 7711da177e4SLinus Torvalds { 772cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 773cb88a1b8SAlan Stern int pipe = urb->pipe; 7741da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 7751da177e4SLinus Torvalds unsigned long flags; 7761da177e4SLinus Torvalds struct usb_tt_clear *clear; 7771da177e4SLinus Torvalds 7781da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 7791da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 7801da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 7811da177e4SLinus Torvalds */ 78254e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 7831da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 7841da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 785cb88a1b8SAlan Stern return -ENOMEM; 7861da177e4SLinus Torvalds } 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 7891da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 7901da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 7911da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 7921da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 7931da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 7941da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 7951da177e4SLinus Torvalds if (usb_pipein (pipe)) 7961da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 7971da177e4SLinus Torvalds 798cb88a1b8SAlan Stern /* info for completion callback */ 799cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 800cb88a1b8SAlan Stern clear->ep = urb->ep; 801cb88a1b8SAlan Stern 8021da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 8031da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 8041da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 805cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 8061da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 807cb88a1b8SAlan Stern return 0; 8081da177e4SLinus Torvalds } 809cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 8101da177e4SLinus Torvalds 8118520f380SAlan Stern /* If do_delay is false, return the number of milliseconds the caller 8128520f380SAlan Stern * needs to delay. 8138520f380SAlan Stern */ 8148520f380SAlan Stern static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) 8151da177e4SLinus Torvalds { 8161da177e4SLinus Torvalds int port1; 817b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 8188520f380SAlan Stern unsigned delay; 8194489a571SAlan Stern u16 wHubCharacteristics = 8204489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 8211da177e4SLinus Torvalds 8224489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 8234489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 8244489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 8254489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 8264489a571SAlan Stern * unless we send these messages to the hub. 8274489a571SAlan Stern */ 8284489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 8291da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 8304489a571SAlan Stern else 8314489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 8324489a571SAlan Stern "non-switchable hub\n"); 8333bbc47d8SKrzysztof Mazur for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) 834ad493e5eSLan Tianyu if (hub->ports[port1 - 1]->power_is_on) 8354489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 836ad493e5eSLan Tianyu else 837ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 838ad493e5eSLan Tianyu USB_PORT_FEAT_POWER); 8391da177e4SLinus Torvalds 840b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 8418520f380SAlan Stern delay = max(pgood_delay, (unsigned) 100); 8428520f380SAlan Stern if (do_delay) 8438520f380SAlan Stern msleep(delay); 8448520f380SAlan Stern return delay; 8451da177e4SLinus Torvalds } 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 8481da177e4SLinus Torvalds u16 *status, u16 *change) 8491da177e4SLinus Torvalds { 8501da177e4SLinus Torvalds int ret; 8511da177e4SLinus Torvalds 852db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 8531da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 854e9e88fb7SAlan Stern if (ret < 0) { 855e9e88fb7SAlan Stern if (ret != -ENODEV) 8561da177e4SLinus Torvalds dev_err(hub->intfdev, 857441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 858e9e88fb7SAlan Stern } else { 8591da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 8601da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 8611da177e4SLinus Torvalds ret = 0; 8621da177e4SLinus Torvalds } 863db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 8641da177e4SLinus Torvalds return ret; 8651da177e4SLinus Torvalds } 8661da177e4SLinus Torvalds 86741e7e056SSarah Sharp static int hub_set_port_link_state(struct usb_hub *hub, int port1, 86841e7e056SSarah Sharp unsigned int link_status) 86941e7e056SSarah Sharp { 87041e7e056SSarah Sharp return set_port_feature(hub->hdev, 87141e7e056SSarah Sharp port1 | (link_status << 3), 87241e7e056SSarah Sharp USB_PORT_FEAT_LINK_STATE); 87341e7e056SSarah Sharp } 87441e7e056SSarah Sharp 87541e7e056SSarah Sharp /* 87641e7e056SSarah Sharp * If USB 3.0 ports are placed into the Disabled state, they will no longer 87741e7e056SSarah Sharp * detect any device connects or disconnects. This is generally not what the 87841e7e056SSarah Sharp * USB core wants, since it expects a disabled port to produce a port status 87941e7e056SSarah Sharp * change event when a new device connects. 88041e7e056SSarah Sharp * 88141e7e056SSarah Sharp * Instead, set the link state to Disabled, wait for the link to settle into 88241e7e056SSarah Sharp * that state, clear any change bits, and then put the port into the RxDetect 88341e7e056SSarah Sharp * state. 88441e7e056SSarah Sharp */ 88541e7e056SSarah Sharp static int hub_usb3_port_disable(struct usb_hub *hub, int port1) 88641e7e056SSarah Sharp { 88741e7e056SSarah Sharp int ret; 88841e7e056SSarah Sharp int total_time; 88941e7e056SSarah Sharp u16 portchange, portstatus; 89041e7e056SSarah Sharp 89141e7e056SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 89241e7e056SSarah Sharp return -EINVAL; 89341e7e056SSarah Sharp 89441e7e056SSarah Sharp ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); 895e9e88fb7SAlan Stern if (ret) 89641e7e056SSarah Sharp return ret; 89741e7e056SSarah Sharp 89841e7e056SSarah Sharp /* Wait for the link to enter the disabled state. */ 89941e7e056SSarah Sharp for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 90041e7e056SSarah Sharp ret = hub_port_status(hub, port1, &portstatus, &portchange); 90141e7e056SSarah Sharp if (ret < 0) 90241e7e056SSarah Sharp return ret; 90341e7e056SSarah Sharp 90441e7e056SSarah Sharp if ((portstatus & USB_PORT_STAT_LINK_STATE) == 90541e7e056SSarah Sharp USB_SS_PORT_LS_SS_DISABLED) 90641e7e056SSarah Sharp break; 90741e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 90841e7e056SSarah Sharp break; 90941e7e056SSarah Sharp msleep(HUB_DEBOUNCE_STEP); 91041e7e056SSarah Sharp } 91141e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 91241e7e056SSarah Sharp dev_warn(hub->intfdev, "Could not disable port %d after %d ms\n", 91341e7e056SSarah Sharp port1, total_time); 91441e7e056SSarah Sharp 91541e7e056SSarah Sharp return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); 91641e7e056SSarah Sharp } 91741e7e056SSarah Sharp 9188b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 9198b28c752SAlan Stern { 9208b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 9210458d5b4SAlan Stern int ret = 0; 9228b28c752SAlan Stern 923ff823c79SLan Tianyu if (hub->ports[port1 - 1]->child && set_state) 924ff823c79SLan Tianyu usb_set_device_state(hub->ports[port1 - 1]->child, 9258b28c752SAlan Stern USB_STATE_NOTATTACHED); 92641e7e056SSarah Sharp if (!hub->error) { 92741e7e056SSarah Sharp if (hub_is_superspeed(hub->hdev)) 92841e7e056SSarah Sharp ret = hub_usb3_port_disable(hub, port1); 92941e7e056SSarah Sharp else 930ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, 93141e7e056SSarah Sharp USB_PORT_FEAT_ENABLE); 93241e7e056SSarah Sharp } 933e9e88fb7SAlan Stern if (ret && ret != -ENODEV) 9348b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 9358b28c752SAlan Stern port1, ret); 9368b28c752SAlan Stern return ret; 9378b28c752SAlan Stern } 9388b28c752SAlan Stern 9390458d5b4SAlan Stern /* 9406d42fcdbSJustin P. Mattock * Disable a port and mark a logical connect-change event, so that some 9410458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 9420458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 9430458d5b4SAlan Stern */ 9440458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 9457d069b7dSAlan Stern { 9460458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 9470458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 9480458d5b4SAlan Stern 9490458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 9500458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 9510458d5b4SAlan Stern * - SRP saves power that way 9520458d5b4SAlan Stern * - ... new call, TBD ... 9530458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 9540458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 9550458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 9560458d5b4SAlan Stern */ 9570458d5b4SAlan Stern 9580458d5b4SAlan Stern set_bit(port1, hub->change_bits); 9590458d5b4SAlan Stern kick_khubd(hub); 9600458d5b4SAlan Stern } 9610458d5b4SAlan Stern 962253e0572SAlan Stern /** 963253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 964253e0572SAlan Stern * @udev: device to be disabled and removed 965253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 966253e0572SAlan Stern * 967253e0572SAlan Stern * After @udev's port has been disabled, khubd is notified and it will 968253e0572SAlan Stern * see that the device has been disconnected. When the device is 969253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 970253e0572SAlan Stern * be received and processed normally. 971626f090cSYacine Belkadi * 972626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 973253e0572SAlan Stern */ 974253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 975253e0572SAlan Stern { 976253e0572SAlan Stern struct usb_hub *hub; 977253e0572SAlan Stern struct usb_interface *intf; 978253e0572SAlan Stern 979253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 980253e0572SAlan Stern return -EINVAL; 981ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 982253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 983253e0572SAlan Stern 984253e0572SAlan Stern usb_autopm_get_interface(intf); 985253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 986253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 987253e0572SAlan Stern usb_autopm_put_interface(intf); 988253e0572SAlan Stern return 0; 989253e0572SAlan Stern } 990253e0572SAlan Stern 9916ee0b270SAlan Stern enum hub_activation_type { 9928e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 9938520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 9946ee0b270SAlan Stern }; 9955e6effaeSAlan Stern 9968520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 9978520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 9988520f380SAlan Stern 999f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 10005e6effaeSAlan Stern { 10015e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 1002653a39d1SSarah Sharp struct usb_hcd *hcd; 1003653a39d1SSarah Sharp int ret; 10045e6effaeSAlan Stern int port1; 1005f2835219SAlan Stern int status; 1006948fea37SAlan Stern bool need_debounce_delay = false; 10078520f380SAlan Stern unsigned delay; 10088520f380SAlan Stern 10098520f380SAlan Stern /* Continue a partial initialization */ 10108520f380SAlan Stern if (type == HUB_INIT2) 10118520f380SAlan Stern goto init2; 10128520f380SAlan Stern if (type == HUB_INIT3) 10138520f380SAlan Stern goto init3; 10145e6effaeSAlan Stern 1015a45aa3b3SElric Fu /* The superspeed hub except for root hub has to use Hub Depth 1016a45aa3b3SElric Fu * value as an offset into the route string to locate the bits 1017a45aa3b3SElric Fu * it uses to determine the downstream port number. So hub driver 1018a45aa3b3SElric Fu * should send a set hub depth request to superspeed hub after 1019a45aa3b3SElric Fu * the superspeed hub is set configuration in initialization or 1020a45aa3b3SElric Fu * reset procedure. 1021a45aa3b3SElric Fu * 1022a45aa3b3SElric Fu * After a resume, port power should still be on. 1023f2835219SAlan Stern * For any other type of activation, turn it on. 1024f2835219SAlan Stern */ 10258520f380SAlan Stern if (type != HUB_RESUME) { 1026a45aa3b3SElric Fu if (hdev->parent && hub_is_superspeed(hdev)) { 1027a45aa3b3SElric Fu ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1028a45aa3b3SElric Fu HUB_SET_DEPTH, USB_RT_HUB, 1029a45aa3b3SElric Fu hdev->level - 1, 0, NULL, 0, 1030a45aa3b3SElric Fu USB_CTRL_SET_TIMEOUT); 1031a45aa3b3SElric Fu if (ret < 0) 1032a45aa3b3SElric Fu dev_err(hub->intfdev, 1033a45aa3b3SElric Fu "set hub depth failed\n"); 1034a45aa3b3SElric Fu } 10358520f380SAlan Stern 10368520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 10378520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 10388520f380SAlan Stern * and the implementation looks like a home-brewed sort of 10398520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 10408520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 10418520f380SAlan Stern * rather than as a module). It adds up. 10428520f380SAlan Stern * 10438520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 10448520f380SAlan Stern * because for those activation types the ports have to be 10458520f380SAlan Stern * operational when we return. In theory this could be done 10468520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 10478520f380SAlan Stern */ 10488520f380SAlan Stern if (type == HUB_INIT) { 10498520f380SAlan Stern delay = hub_power_on(hub, false); 10508520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); 10518520f380SAlan Stern schedule_delayed_work(&hub->init_work, 10528520f380SAlan Stern msecs_to_jiffies(delay)); 105361fbeba1SAlan Stern 105461fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 10558e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 10568e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 10578520f380SAlan Stern return; /* Continues at init2: below */ 1058653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 1059653a39d1SSarah Sharp /* The internal host controller state for the hub device 1060653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 1061653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 1062653a39d1SSarah Sharp */ 1063653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1064653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 1065653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1066653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 1067653a39d1SSarah Sharp if (ret < 0) { 1068653a39d1SSarah Sharp dev_err(hub->intfdev, "Host not " 1069653a39d1SSarah Sharp "accepting hub info " 1070653a39d1SSarah Sharp "update.\n"); 1071653a39d1SSarah Sharp dev_err(hub->intfdev, "LS/FS devices " 1072653a39d1SSarah Sharp "and hubs may not work " 1073653a39d1SSarah Sharp "under this hub\n."); 1074653a39d1SSarah Sharp } 1075653a39d1SSarah Sharp } 1076653a39d1SSarah Sharp hub_power_on(hub, true); 10778520f380SAlan Stern } else { 10788520f380SAlan Stern hub_power_on(hub, true); 10798520f380SAlan Stern } 10808520f380SAlan Stern } 10818520f380SAlan Stern init2: 1082f2835219SAlan Stern 10836ee0b270SAlan Stern /* Check each port and set hub->change_bits to let khubd know 10846ee0b270SAlan Stern * which ports need attention. 10855e6effaeSAlan Stern */ 10865e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 1087ff823c79SLan Tianyu struct usb_device *udev = hub->ports[port1 - 1]->child; 10885e6effaeSAlan Stern u16 portstatus, portchange; 10895e6effaeSAlan Stern 10906ee0b270SAlan Stern portstatus = portchange = 0; 10916ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 10926ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 10936ee0b270SAlan Stern dev_dbg(hub->intfdev, 10946ee0b270SAlan Stern "port %d: status %04x change %04x\n", 10956ee0b270SAlan Stern port1, portstatus, portchange); 10965e6effaeSAlan Stern 10976ee0b270SAlan Stern /* After anything other than HUB_RESUME (i.e., initialization 10986ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 10996ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 11006ee0b270SAlan Stern * and so should ports for which we have no usb_device. 11015e6effaeSAlan Stern */ 11026ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 11036ee0b270SAlan Stern type != HUB_RESUME || 11046ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 11056ee0b270SAlan Stern !udev || 11066ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 11079f0a6cd3SAndiry Xu /* 11089f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 11099f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 11109f0a6cd3SAndiry Xu * Do not disable USB3 protocol ports. 11119f0a6cd3SAndiry Xu */ 1112131dec34SSarah Sharp if (!hub_is_superspeed(hdev)) { 1113ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port1, 11149f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 11156ee0b270SAlan Stern portstatus &= ~USB_PORT_STAT_ENABLE; 111685f0ff46SSarah Sharp } else { 111785f0ff46SSarah Sharp /* Pretend that power was lost for USB3 devs */ 111885f0ff46SSarah Sharp portstatus &= ~USB_PORT_STAT_ENABLE; 11196ee0b270SAlan Stern } 11209f0a6cd3SAndiry Xu } 11216ee0b270SAlan Stern 1122948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 1123948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 1124948fea37SAlan Stern need_debounce_delay = true; 1125ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1126948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 1127948fea37SAlan Stern } 1128948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 1129948fea37SAlan Stern need_debounce_delay = true; 1130ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1131948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 1132948fea37SAlan Stern } 113379c3dd81SDon Zickus if ((portchange & USB_PORT_STAT_C_BH_RESET) && 113479c3dd81SDon Zickus hub_is_superspeed(hub->hdev)) { 113579c3dd81SDon Zickus need_debounce_delay = true; 1136ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 113779c3dd81SDon Zickus USB_PORT_FEAT_C_BH_PORT_RESET); 113879c3dd81SDon Zickus } 1139253e0572SAlan Stern /* We can forget about a "removed" device when there's a 1140253e0572SAlan Stern * physical disconnect or the connect status changes. 1141253e0572SAlan Stern */ 1142253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 1143253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 1144253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 1145253e0572SAlan Stern 11466ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 11476ee0b270SAlan Stern /* Tell khubd to disconnect the device or 11486ee0b270SAlan Stern * check for a new connection 11496ee0b270SAlan Stern */ 11506ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 11516ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11526ee0b270SAlan Stern 11536ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 115472937e1eSSarah Sharp bool port_resumed = (portstatus & 115572937e1eSSarah Sharp USB_PORT_STAT_LINK_STATE) == 115672937e1eSSarah Sharp USB_SS_PORT_LS_U0; 11576ee0b270SAlan Stern /* The power session apparently survived the resume. 11586ee0b270SAlan Stern * If there was an overcurrent or suspend change 11596ee0b270SAlan Stern * (i.e., remote wakeup request), have khubd 116072937e1eSSarah Sharp * take care of it. Look at the port link state 116172937e1eSSarah Sharp * for USB 3.0 hubs, since they don't have a suspend 116272937e1eSSarah Sharp * change bit, and they don't set the port link change 116372937e1eSSarah Sharp * bit on device-initiated resume. 11646ee0b270SAlan Stern */ 116572937e1eSSarah Sharp if (portchange || (hub_is_superspeed(hub->hdev) && 116672937e1eSSarah Sharp port_resumed)) 11676ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11686ee0b270SAlan Stern 11696ee0b270SAlan Stern } else if (udev->persist_enabled) { 1170ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[port1 - 1]; 1171ad493e5eSLan Tianyu 11726ee0b270SAlan Stern #ifdef CONFIG_PM 11735e6effaeSAlan Stern udev->reset_resume = 1; 11746ee0b270SAlan Stern #endif 1175ad493e5eSLan Tianyu /* Don't set the change_bits when the device 1176ad493e5eSLan Tianyu * was powered off. 1177ad493e5eSLan Tianyu */ 1178ad493e5eSLan Tianyu if (port_dev->power_is_on) 11798808f00cSAlan Stern set_bit(port1, hub->change_bits); 11808808f00cSAlan Stern 11816ee0b270SAlan Stern } else { 11826ee0b270SAlan Stern /* The power session is gone; tell khubd */ 11836ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11846ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11855e6effaeSAlan Stern } 11865e6effaeSAlan Stern } 11875e6effaeSAlan Stern 1188948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 1189948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 1190948fea37SAlan Stern * ports all at once right now, instead of letting khubd do them 1191948fea37SAlan Stern * one at a time later on. 1192948fea37SAlan Stern * 1193948fea37SAlan Stern * If any port-status changes do occur during this delay, khubd 1194948fea37SAlan Stern * will see them later and handle them normally. 1195948fea37SAlan Stern */ 11968520f380SAlan Stern if (need_debounce_delay) { 11978520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 1198f2835219SAlan Stern 11998520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 12008520f380SAlan Stern if (type == HUB_INIT2) { 12018520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); 12028520f380SAlan Stern schedule_delayed_work(&hub->init_work, 12038520f380SAlan Stern msecs_to_jiffies(delay)); 12048520f380SAlan Stern return; /* Continues at init3: below */ 12058520f380SAlan Stern } else { 12068520f380SAlan Stern msleep(delay); 12078520f380SAlan Stern } 12088520f380SAlan Stern } 12098520f380SAlan Stern init3: 1210f2835219SAlan Stern hub->quiescing = 0; 1211f2835219SAlan Stern 1212f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 1213f2835219SAlan Stern if (status < 0) 1214f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 1215f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 1216f2835219SAlan Stern schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 1217f2835219SAlan Stern 1218f2835219SAlan Stern /* Scan all ports that need attention */ 1219f2835219SAlan Stern kick_khubd(hub); 12208e4ceb38SAlan Stern 12218e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 12228e4ceb38SAlan Stern if (type <= HUB_INIT3) 12238e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 12245e6effaeSAlan Stern } 12255e6effaeSAlan Stern 12268520f380SAlan Stern /* Implement the continuations for the delays above */ 12278520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 12288520f380SAlan Stern { 12298520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12308520f380SAlan Stern 12318520f380SAlan Stern hub_activate(hub, HUB_INIT2); 12328520f380SAlan Stern } 12338520f380SAlan Stern 12348520f380SAlan Stern static void hub_init_func3(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_INIT3); 12398520f380SAlan Stern } 12408520f380SAlan Stern 12414330354fSAlan Stern enum hub_quiescing_type { 12424330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 12434330354fSAlan Stern }; 12444330354fSAlan Stern 12454330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 12464330354fSAlan Stern { 12474330354fSAlan Stern struct usb_device *hdev = hub->hdev; 12484330354fSAlan Stern int i; 12494330354fSAlan Stern 12508520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 12518520f380SAlan Stern 12524330354fSAlan Stern /* khubd and related activity won't re-trigger */ 12534330354fSAlan Stern hub->quiescing = 1; 12544330354fSAlan Stern 12554330354fSAlan Stern if (type != HUB_SUSPEND) { 12564330354fSAlan Stern /* Disconnect all the children */ 12574330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 1258ff823c79SLan Tianyu if (hub->ports[i]->child) 1259ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 12604330354fSAlan Stern } 12614330354fSAlan Stern } 12624330354fSAlan Stern 12634330354fSAlan Stern /* Stop khubd and related activity */ 12644330354fSAlan Stern usb_kill_urb(hub->urb); 12654330354fSAlan Stern if (hub->has_indicators) 12664330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 12674330354fSAlan Stern if (hub->tt.hub) 1268036546bfSOctavian Purdila flush_work(&hub->tt.clear_work); 12694330354fSAlan Stern } 12704330354fSAlan Stern 12713eb14915SAlan Stern /* caller has locked the hub device */ 12723eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 12733eb14915SAlan Stern { 12743eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12753eb14915SAlan Stern 12764330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 1277f07600cfSAlan Stern return 0; 12787d069b7dSAlan Stern } 12797d069b7dSAlan Stern 12807d069b7dSAlan Stern /* caller has locked the hub device */ 1281f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 12827d069b7dSAlan Stern { 12837de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12847de18d8bSAlan Stern 1285f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 1286f07600cfSAlan Stern return 0; 12877d069b7dSAlan Stern } 12887d069b7dSAlan Stern 12891da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 12901da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 12911da177e4SLinus Torvalds { 1292b356b7c7SSarah Sharp struct usb_hcd *hcd; 12931da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 12941da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 12951da177e4SLinus Torvalds u16 hubstatus, hubchange; 129674ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 12971da177e4SLinus Torvalds unsigned int pipe; 1298fa2a9566SLan Tianyu int maxp, ret, i; 12997cbe5dcaSAlan Stern char *message = "out of memory"; 1300430ee58eSSebastian Andrzej Siewior unsigned unit_load; 1301430ee58eSSebastian Andrzej Siewior unsigned full_load; 13021da177e4SLinus Torvalds 1303d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 13041da177e4SLinus Torvalds if (!hub->buffer) { 13051da177e4SLinus Torvalds ret = -ENOMEM; 13061da177e4SLinus Torvalds goto fail; 13071da177e4SLinus Torvalds } 13081da177e4SLinus Torvalds 13091da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 13101da177e4SLinus Torvalds if (!hub->status) { 13111da177e4SLinus Torvalds ret = -ENOMEM; 13121da177e4SLinus Torvalds goto fail; 13131da177e4SLinus Torvalds } 1314db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 13151da177e4SLinus Torvalds 13161da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 13171da177e4SLinus Torvalds if (!hub->descriptor) { 13181da177e4SLinus Torvalds ret = -ENOMEM; 13191da177e4SLinus Torvalds goto fail; 13201da177e4SLinus Torvalds } 13211da177e4SLinus Torvalds 13221da177e4SLinus Torvalds /* Request the entire hub descriptor. 13231da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 13241da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 13251da177e4SLinus Torvalds */ 1326dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 13271da177e4SLinus Torvalds if (ret < 0) { 13281da177e4SLinus Torvalds message = "can't read hub descriptor"; 13291da177e4SLinus Torvalds goto fail; 13301da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 13311da177e4SLinus Torvalds message = "hub has too many ports!"; 13321da177e4SLinus Torvalds ret = -ENODEV; 13331da177e4SLinus Torvalds goto fail; 1334769d7368SDavid Linares } else if (hub->descriptor->bNbrPorts == 0) { 1335769d7368SDavid Linares message = "hub doesn't have any ports!"; 1336769d7368SDavid Linares ret = -ENODEV; 1337769d7368SDavid Linares goto fail; 13381da177e4SLinus Torvalds } 13391da177e4SLinus Torvalds 13401da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 13411da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 13421da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 13431da177e4SLinus Torvalds 1344fa2a9566SLan Tianyu hub->ports = kzalloc(hdev->maxchild * sizeof(struct usb_port *), 1345336c5c31SLan Tianyu GFP_KERNEL); 1346ff823c79SLan Tianyu if (!hub->ports) { 13477cbe5dcaSAlan Stern ret = -ENOMEM; 13487cbe5dcaSAlan Stern goto fail; 13497cbe5dcaSAlan Stern } 13507cbe5dcaSAlan Stern 135174ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 1352430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hdev)) { 1353430ee58eSSebastian Andrzej Siewior unit_load = 150; 1354430ee58eSSebastian Andrzej Siewior full_load = 900; 1355430ee58eSSebastian Andrzej Siewior } else { 1356430ee58eSSebastian Andrzej Siewior unit_load = 100; 1357430ee58eSSebastian Andrzej Siewior full_load = 500; 1358430ee58eSSebastian Andrzej Siewior } 13591da177e4SLinus Torvalds 1360dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1361dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1362dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 13631da177e4SLinus Torvalds int i; 13641da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 13651da177e4SLinus Torvalds 13661da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 1367dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 13681da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 13691da177e4SLinus Torvalds ? 'F' : 'R'; 13701da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 13711da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 13721da177e4SLinus Torvalds } else 13731da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 13741da177e4SLinus Torvalds 137574ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 13767bf01185SAman Deep case HUB_CHAR_COMMON_LPSM: 13771da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 13781da177e4SLinus Torvalds break; 13797bf01185SAman Deep case HUB_CHAR_INDV_PORT_LPSM: 13801da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 13811da177e4SLinus Torvalds break; 13827bf01185SAman Deep case HUB_CHAR_NO_LPSM: 13837bf01185SAman Deep case HUB_CHAR_LPSM: 13841da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 13851da177e4SLinus Torvalds break; 13861da177e4SLinus Torvalds } 13871da177e4SLinus Torvalds 138874ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 13897bf01185SAman Deep case HUB_CHAR_COMMON_OCPM: 13901da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 13911da177e4SLinus Torvalds break; 13927bf01185SAman Deep case HUB_CHAR_INDV_PORT_OCPM: 13931da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 13941da177e4SLinus Torvalds break; 13957bf01185SAman Deep case HUB_CHAR_NO_OCPM: 13967bf01185SAman Deep case HUB_CHAR_OCPM: 13971da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 13981da177e4SLinus Torvalds break; 13991da177e4SLinus Torvalds } 14001da177e4SLinus Torvalds 14011da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 14021da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 1403cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 14041da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 14057bf01185SAman Deep case USB_HUB_PR_FS: 14061da177e4SLinus Torvalds break; 14077bf01185SAman Deep case USB_HUB_PR_HS_SINGLE_TT: 14081da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 14091da177e4SLinus Torvalds hub->tt.hub = hdev; 14101da177e4SLinus Torvalds break; 14117bf01185SAman Deep case USB_HUB_PR_HS_MULTI_TT: 14121da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 14131da177e4SLinus Torvalds if (ret == 0) { 14141da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 14151da177e4SLinus Torvalds hub->tt.multi = 1; 14161da177e4SLinus Torvalds } else 14171da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 14181da177e4SLinus Torvalds ret); 14191da177e4SLinus Torvalds hub->tt.hub = hdev; 14201da177e4SLinus Torvalds break; 14217bf01185SAman Deep case USB_HUB_PR_SS: 1422d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1423d2e9b4d6SSarah Sharp break; 14241da177e4SLinus Torvalds default: 14251da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 14261da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 14271da177e4SLinus Torvalds break; 14281da177e4SLinus Torvalds } 14291da177e4SLinus Torvalds 1430e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 143174ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1432e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1433e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1434e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1435e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1436e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1437e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1438e09711aeSdavid-b@pacbell.net } 14391da177e4SLinus Torvalds break; 1440e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1441e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 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 16, hub->tt.think_time); 14451da177e4SLinus Torvalds break; 1446e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1447e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1448e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1449e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1450e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 14511da177e4SLinus Torvalds break; 1452e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1453e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1454e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1455e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1456e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 14571da177e4SLinus Torvalds break; 14581da177e4SLinus Torvalds } 14591da177e4SLinus Torvalds 14601da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 146174ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 14621da177e4SLinus Torvalds hub->has_indicators = 1; 14631da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 14641da177e4SLinus Torvalds } 14651da177e4SLinus Torvalds 14661da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 14671da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 14681da177e4SLinus Torvalds 14691da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 14701da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 14711da177e4SLinus Torvalds */ 14721da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 147315b7336eSAlan Stern if (ret) { 14741da177e4SLinus Torvalds message = "can't get hub status"; 14751da177e4SLinus Torvalds goto fail; 14761da177e4SLinus Torvalds } 1477430ee58eSSebastian Andrzej Siewior hcd = bus_to_hcd(hdev->bus); 14787d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 1479430ee58eSSebastian Andrzej Siewior if (hcd->power_budget > 0) 1480430ee58eSSebastian Andrzej Siewior hdev->bus_mA = hcd->power_budget; 1481430ee58eSSebastian Andrzej Siewior else 1482430ee58eSSebastian Andrzej Siewior hdev->bus_mA = full_load * hdev->maxchild; 1483430ee58eSSebastian Andrzej Siewior if (hdev->bus_mA >= full_load) 1484430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 148555c52718SAlan Stern else { 148655c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 148755c52718SAlan Stern hub->limited_power = 1; 148855c52718SAlan Stern } 14897d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 149055c52718SAlan Stern int remaining = hdev->bus_mA - 149155c52718SAlan Stern hub->descriptor->bHubContrCurrent; 14921da177e4SLinus Torvalds 1493430ee58eSSebastian Andrzej Siewior dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 1494430ee58eSSebastian Andrzej Siewior hub->descriptor->bHubContrCurrent); 1495430ee58eSSebastian Andrzej Siewior hub->limited_power = 1; 1496430ee58eSSebastian Andrzej Siewior 1497430ee58eSSebastian Andrzej Siewior if (remaining < hdev->maxchild * unit_load) 149855c52718SAlan Stern dev_warn(hub_dev, 149955c52718SAlan Stern "insufficient power available " 150055c52718SAlan Stern "to use all downstream ports\n"); 1501430ee58eSSebastian Andrzej Siewior hub->mA_per_port = unit_load; /* 7.2.1 */ 1502430ee58eSSebastian Andrzej Siewior 150355c52718SAlan Stern } else { /* Self-powered external hub */ 150455c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 150555c52718SAlan Stern * provide less current per port? */ 1506430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 150755c52718SAlan Stern } 1508430ee58eSSebastian Andrzej Siewior if (hub->mA_per_port < full_load) 150955c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 151055c52718SAlan Stern hub->mA_per_port); 15111da177e4SLinus Torvalds 1512b356b7c7SSarah Sharp /* Update the HCD's internal representation of this hub before khubd 1513b356b7c7SSarah Sharp * starts getting port status changes for devices under the hub. 1514b356b7c7SSarah Sharp */ 1515b356b7c7SSarah Sharp if (hcd->driver->update_hub_device) { 1516b356b7c7SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1517b356b7c7SSarah Sharp &hub->tt, GFP_KERNEL); 1518b356b7c7SSarah Sharp if (ret < 0) { 1519b356b7c7SSarah Sharp message = "can't update HCD hub info"; 1520b356b7c7SSarah Sharp goto fail; 1521b356b7c7SSarah Sharp } 1522b356b7c7SSarah Sharp } 1523b356b7c7SSarah Sharp 15241da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 15251da177e4SLinus Torvalds if (ret < 0) { 15261da177e4SLinus Torvalds message = "can't get hub status"; 15271da177e4SLinus Torvalds goto fail; 15281da177e4SLinus Torvalds } 15291da177e4SLinus Torvalds 15301da177e4SLinus Torvalds /* local power status reports aren't always correct */ 15311da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 15321da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 15331da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 15341da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 15351da177e4SLinus Torvalds 153674ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 15371da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 15381da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 15391da177e4SLinus Torvalds 154088fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 154188fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 154288fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 154388fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 154488fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 154588fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 15461da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 15471da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 15481da177e4SLinus Torvalds 15491da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 15501da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 15511da177e4SLinus Torvalds 15521da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 15531da177e4SLinus Torvalds if (!hub->urb) { 15541da177e4SLinus Torvalds ret = -ENOMEM; 15551da177e4SLinus Torvalds goto fail; 15561da177e4SLinus Torvalds } 15571da177e4SLinus Torvalds 15581da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 15591da177e4SLinus Torvalds hub, endpoint->bInterval); 15601da177e4SLinus Torvalds 15611da177e4SLinus Torvalds /* maybe cycle the hub leds */ 15621da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 15631da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 15641da177e4SLinus Torvalds 1565e58547ebSKrzysztof Mazur for (i = 0; i < hdev->maxchild; i++) { 1566e58547ebSKrzysztof Mazur ret = usb_hub_create_port_device(hub, i + 1); 1567e58547ebSKrzysztof Mazur if (ret < 0) { 1568fa2a9566SLan Tianyu dev_err(hub->intfdev, 1569fa2a9566SLan Tianyu "couldn't create port%d device.\n", i + 1); 1570e58547ebSKrzysztof Mazur hdev->maxchild = i; 1571e58547ebSKrzysztof Mazur goto fail_keep_maxchild; 1572e58547ebSKrzysztof Mazur } 1573e58547ebSKrzysztof Mazur } 1574fa2a9566SLan Tianyu 1575d2123fd9SLan Tianyu usb_hub_adjust_deviceremovable(hdev, hub->descriptor); 1576d2123fd9SLan Tianyu 1577f2835219SAlan Stern hub_activate(hub, HUB_INIT); 15781da177e4SLinus Torvalds return 0; 15791da177e4SLinus Torvalds 15801da177e4SLinus Torvalds fail: 1581d0308d4bSKrzysztof Mazur hdev->maxchild = 0; 1582e58547ebSKrzysztof Mazur fail_keep_maxchild: 15831da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 15841da177e4SLinus Torvalds message, ret); 15851da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 15861da177e4SLinus Torvalds return ret; 15871da177e4SLinus Torvalds } 15881da177e4SLinus Torvalds 1589e8054854SAlan Stern static void hub_release(struct kref *kref) 1590e8054854SAlan Stern { 1591e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1592e8054854SAlan Stern 1593e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1594e8054854SAlan Stern kfree(hub); 1595e8054854SAlan Stern } 1596e8054854SAlan Stern 15971da177e4SLinus Torvalds static unsigned highspeed_hubs; 15981da177e4SLinus Torvalds 15991da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 16001da177e4SLinus Torvalds { 16011da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 1602fa286188SGreg Kroah-Hartman struct usb_device *hdev = interface_to_usbdev(intf); 1603fa2a9566SLan Tianyu int i; 1604fa2a9566SLan Tianyu 1605e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 1606e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 16078e4ceb38SAlan Stern if (!list_empty(&hub->event_list)) { 1608e8054854SAlan Stern list_del_init(&hub->event_list); 16098e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 16108e4ceb38SAlan Stern } 1611e8054854SAlan Stern hub->disconnected = 1; 1612e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 16131da177e4SLinus Torvalds 16147de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 16157de18d8bSAlan Stern hub->error = 0; 16164330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 16177de18d8bSAlan Stern 16188b28c752SAlan Stern usb_set_intfdata (intf, NULL); 16191f2235b8SAlexander Shishkin 16201f2235b8SAlexander Shishkin for (i = 0; i < hdev->maxchild; i++) 16211f2235b8SAlexander Shishkin usb_hub_remove_port_device(hub, i + 1); 16227cbe5dcaSAlan Stern hub->hdev->maxchild = 0; 16231da177e4SLinus Torvalds 1624e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 16251da177e4SLinus Torvalds highspeed_hubs--; 16261da177e4SLinus Torvalds 16271da177e4SLinus Torvalds usb_free_urb(hub->urb); 1628fa2a9566SLan Tianyu kfree(hub->ports); 16291da177e4SLinus Torvalds kfree(hub->descriptor); 16301da177e4SLinus Torvalds kfree(hub->status); 1631d697cddaSAlan Stern kfree(hub->buffer); 16321da177e4SLinus Torvalds 1633971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, false); 1634e8054854SAlan Stern kref_put(&hub->kref, hub_release); 16351da177e4SLinus Torvalds } 16361da177e4SLinus Torvalds 16371da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 16381da177e4SLinus Torvalds { 16391da177e4SLinus Torvalds struct usb_host_interface *desc; 16401da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 16411da177e4SLinus Torvalds struct usb_device *hdev; 16421da177e4SLinus Torvalds struct usb_hub *hub; 16431da177e4SLinus Torvalds 16441da177e4SLinus Torvalds desc = intf->cur_altsetting; 16451da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 16461da177e4SLinus Torvalds 1647596d789aSMing Lei /* 1648596d789aSMing Lei * Set default autosuspend delay as 0 to speedup bus suspend, 1649596d789aSMing Lei * based on the below considerations: 1650596d789aSMing Lei * 1651596d789aSMing Lei * - Unlike other drivers, the hub driver does not rely on the 1652596d789aSMing Lei * autosuspend delay to provide enough time to handle a wakeup 1653596d789aSMing Lei * event, and the submitted status URB is just to check future 1654596d789aSMing Lei * change on hub downstream ports, so it is safe to do it. 1655596d789aSMing Lei * 1656596d789aSMing Lei * - The patch might cause one or more auto supend/resume for 1657596d789aSMing Lei * below very rare devices when they are plugged into hub 1658596d789aSMing Lei * first time: 1659596d789aSMing Lei * 1660596d789aSMing Lei * devices having trouble initializing, and disconnect 1661596d789aSMing Lei * themselves from the bus and then reconnect a second 1662596d789aSMing Lei * or so later 1663596d789aSMing Lei * 1664596d789aSMing Lei * devices just for downloading firmware, and disconnects 1665596d789aSMing Lei * themselves after completing it 1666596d789aSMing Lei * 1667596d789aSMing Lei * For these quite rare devices, their drivers may change the 1668596d789aSMing Lei * autosuspend delay of their parent hub in the probe() to one 1669596d789aSMing Lei * appropriate value to avoid the subtle problem if someone 1670596d789aSMing Lei * does care it. 1671596d789aSMing Lei * 1672596d789aSMing Lei * - The patch may cause one or more auto suspend/resume on 1673596d789aSMing Lei * hub during running 'lsusb', but it is probably too 1674596d789aSMing Lei * infrequent to worry about. 1675596d789aSMing Lei * 1676596d789aSMing Lei * - Change autosuspend delay of hub can avoid unnecessary auto 1677596d789aSMing Lei * suspend timer for hub, also may decrease power consumption 1678596d789aSMing Lei * of USB bus. 1679596d789aSMing Lei */ 1680596d789aSMing Lei pm_runtime_set_autosuspend_delay(&hdev->dev, 0); 1681596d789aSMing Lei 16822839f5bcSSarah Sharp /* Hubs have proper suspend/resume support. */ 1683088f7fecSAlan Stern usb_enable_autosuspend(hdev); 1684088f7fecSAlan Stern 168538f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1686b9cef6c3SWu Fengguang dev_err(&intf->dev, 1687b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 168838f3ad5eSFelipe Balbi return -E2BIG; 168938f3ad5eSFelipe Balbi } 169038f3ad5eSFelipe Balbi 169189ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 169289ccbdc9SDavid Brownell if (hdev->parent) { 169389ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 169489ccbdc9SDavid Brownell return -ENODEV; 169589ccbdc9SDavid Brownell } 169689ccbdc9SDavid Brownell #endif 169789ccbdc9SDavid Brownell 16981da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 16991da177e4SLinus Torvalds /* specs is not defined, but it works */ 17001da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 17011da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 17021da177e4SLinus Torvalds descriptor_error: 17031da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 17041da177e4SLinus Torvalds return -EIO; 17051da177e4SLinus Torvalds } 17061da177e4SLinus Torvalds 17071da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 17081da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 17091da177e4SLinus Torvalds goto descriptor_error; 17101da177e4SLinus Torvalds 17111da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 17121da177e4SLinus Torvalds 1713fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1714fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 17151da177e4SLinus Torvalds goto descriptor_error; 17161da177e4SLinus Torvalds 17171da177e4SLinus Torvalds /* We found a hub */ 17181da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 17191da177e4SLinus Torvalds 17200a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 17211da177e4SLinus Torvalds if (!hub) { 17221da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 17231da177e4SLinus Torvalds return -ENOMEM; 17241da177e4SLinus Torvalds } 17251da177e4SLinus Torvalds 1726e8054854SAlan Stern kref_init(&hub->kref); 17271da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 17281da177e4SLinus Torvalds hub->intfdev = &intf->dev; 17291da177e4SLinus Torvalds hub->hdev = hdev; 1730c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 17318520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 1732e8054854SAlan Stern usb_get_intf(intf); 17331da177e4SLinus Torvalds 17341da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 173540f122f3SAlan Stern intf->needs_remote_wakeup = 1; 1736971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, true); 17371da177e4SLinus Torvalds 17381da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 17391da177e4SLinus Torvalds highspeed_hubs++; 17401da177e4SLinus Torvalds 1741e6f30deaSMing Lei if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) 1742e6f30deaSMing Lei hub->quirk_check_port_auto_suspend = 1; 1743e6f30deaSMing Lei 17441da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 17451da177e4SLinus Torvalds return 0; 17461da177e4SLinus Torvalds 17471da177e4SLinus Torvalds hub_disconnect (intf); 17481da177e4SLinus Torvalds return -ENODEV; 17491da177e4SLinus Torvalds } 17501da177e4SLinus Torvalds 17511da177e4SLinus Torvalds static int 17521da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 17531da177e4SLinus Torvalds { 17541da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 1755ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 17561da177e4SLinus Torvalds 17571da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 17581da177e4SLinus Torvalds switch (code) { 17591da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 17601da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 17611da177e4SLinus Torvalds int i; 17621da177e4SLinus Torvalds 17631da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 17641da177e4SLinus Torvalds if (hdev->devnum <= 0) 17651da177e4SLinus Torvalds info->nports = 0; 17661da177e4SLinus Torvalds else { 17671da177e4SLinus Torvalds info->nports = hdev->maxchild; 17681da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 1769ff823c79SLan Tianyu if (hub->ports[i]->child == NULL) 17701da177e4SLinus Torvalds info->port[i] = 0; 17711da177e4SLinus Torvalds else 17721da177e4SLinus Torvalds info->port[i] = 1773ff823c79SLan Tianyu hub->ports[i]->child->devnum; 17741da177e4SLinus Torvalds } 17751da177e4SLinus Torvalds } 17761da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 17771da177e4SLinus Torvalds 17781da177e4SLinus Torvalds return info->nports + 1; 17791da177e4SLinus Torvalds } 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds default: 17821da177e4SLinus Torvalds return -ENOSYS; 17831da177e4SLinus Torvalds } 17841da177e4SLinus Torvalds } 17851da177e4SLinus Torvalds 17867cbe5dcaSAlan Stern /* 17877cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 17887cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 17897cbe5dcaSAlan Stern */ 17907cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 1791336c5c31SLan Tianyu struct dev_state ***ppowner) 17927cbe5dcaSAlan Stern { 179341341261SMathias Nyman struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 179441341261SMathias Nyman 17957cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 17967cbe5dcaSAlan Stern return -ENODEV; 17977cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 17987cbe5dcaSAlan Stern return -EINVAL; 17997cbe5dcaSAlan Stern 180041341261SMathias Nyman /* Devices not managed by the hub driver 18017cbe5dcaSAlan Stern * will always have maxchild equal to 0. 18027cbe5dcaSAlan Stern */ 180341341261SMathias Nyman *ppowner = &(hub->ports[port1 - 1]->port_owner); 18047cbe5dcaSAlan Stern return 0; 18057cbe5dcaSAlan Stern } 18067cbe5dcaSAlan Stern 18077cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 1808336c5c31SLan Tianyu int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, 1809336c5c31SLan Tianyu struct dev_state *owner) 18107cbe5dcaSAlan Stern { 18117cbe5dcaSAlan Stern int rc; 1812336c5c31SLan Tianyu struct dev_state **powner; 18137cbe5dcaSAlan Stern 18147cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18157cbe5dcaSAlan Stern if (rc) 18167cbe5dcaSAlan Stern return rc; 18177cbe5dcaSAlan Stern if (*powner) 18187cbe5dcaSAlan Stern return -EBUSY; 18197cbe5dcaSAlan Stern *powner = owner; 18207cbe5dcaSAlan Stern return rc; 18217cbe5dcaSAlan Stern } 18227cbe5dcaSAlan Stern 1823336c5c31SLan Tianyu int usb_hub_release_port(struct usb_device *hdev, unsigned port1, 1824336c5c31SLan Tianyu struct dev_state *owner) 18257cbe5dcaSAlan Stern { 18267cbe5dcaSAlan Stern int rc; 1827336c5c31SLan Tianyu struct dev_state **powner; 18287cbe5dcaSAlan Stern 18297cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18307cbe5dcaSAlan Stern if (rc) 18317cbe5dcaSAlan Stern return rc; 18327cbe5dcaSAlan Stern if (*powner != owner) 18337cbe5dcaSAlan Stern return -ENOENT; 18347cbe5dcaSAlan Stern *powner = NULL; 18357cbe5dcaSAlan Stern return rc; 18367cbe5dcaSAlan Stern } 18377cbe5dcaSAlan Stern 1838336c5c31SLan Tianyu void usb_hub_release_all_ports(struct usb_device *hdev, struct dev_state *owner) 18397cbe5dcaSAlan Stern { 1840ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 18417cbe5dcaSAlan Stern int n; 18427cbe5dcaSAlan Stern 1843fa2a9566SLan Tianyu for (n = 0; n < hdev->maxchild; n++) { 1844fa2a9566SLan Tianyu if (hub->ports[n]->port_owner == owner) 1845fa2a9566SLan Tianyu hub->ports[n]->port_owner = NULL; 18467cbe5dcaSAlan Stern } 1847fa2a9566SLan Tianyu 18487cbe5dcaSAlan Stern } 18497cbe5dcaSAlan Stern 18507cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 18517cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 18527cbe5dcaSAlan Stern { 18537cbe5dcaSAlan Stern struct usb_hub *hub; 18547cbe5dcaSAlan Stern 18557cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 18567cbe5dcaSAlan Stern return false; 1857ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 1858fa2a9566SLan Tianyu return !!hub->ports[udev->portnum - 1]->port_owner; 18597cbe5dcaSAlan Stern } 18607cbe5dcaSAlan Stern 18611da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 18621da177e4SLinus Torvalds { 1863ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 18641da177e4SLinus Torvalds int i; 18651da177e4SLinus Torvalds 18661da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 1867ff823c79SLan Tianyu if (hub->ports[i]->child) 1868ff823c79SLan Tianyu recursively_mark_NOTATTACHED(hub->ports[i]->child); 18691da177e4SLinus Torvalds } 18709bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 187115123006SSarah Sharp udev->active_duration -= jiffies; 18721da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 18731da177e4SLinus Torvalds } 18741da177e4SLinus Torvalds 18751da177e4SLinus Torvalds /** 18761da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 18771da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 18781da177e4SLinus Torvalds * @new_state: new state value to be stored 18791da177e4SLinus Torvalds * 18801da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 18811da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 18821da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 18831da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 18841da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 18851da177e4SLinus Torvalds * all changes to any device's state must be protected by the 18861da177e4SLinus Torvalds * device_state_lock spinlock. 18871da177e4SLinus Torvalds * 18881da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 18891da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 18901da177e4SLinus Torvalds * 18911da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 18921da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 18931da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 18941da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 18951da177e4SLinus Torvalds */ 18961da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 18971da177e4SLinus Torvalds enum usb_device_state new_state) 18981da177e4SLinus Torvalds { 18991da177e4SLinus Torvalds unsigned long flags; 19004681b171SRafael J. Wysocki int wakeup = -1; 19011da177e4SLinus Torvalds 19021da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 19031da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 19041da177e4SLinus Torvalds ; /* do nothing */ 1905b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1906fb669cc0SDavid Brownell 1907fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1908fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1909fb669cc0SDavid Brownell */ 1910fb669cc0SDavid Brownell if (udev->parent) { 1911645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1912645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1913645daaabSAlan Stern ; /* No change to wakeup settings */ 1914645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 19154681b171SRafael J. Wysocki wakeup = udev->actconfig->desc.bmAttributes 19164681b171SRafael J. Wysocki & USB_CONFIG_ATT_WAKEUP; 1917645daaabSAlan Stern else 19184681b171SRafael J. Wysocki wakeup = 0; 1919fb669cc0SDavid Brownell } 192015123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 192115123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 192215123006SSarah Sharp udev->active_duration -= jiffies; 192315123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 192415123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 192515123006SSarah Sharp udev->active_duration += jiffies; 1926645daaabSAlan Stern udev->state = new_state; 1927b94dc6b5SDavid Brownell } else 19281da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 19291da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 19304681b171SRafael J. Wysocki if (wakeup >= 0) 19314681b171SRafael J. Wysocki device_set_wakeup_capable(&udev->dev, wakeup); 19321da177e4SLinus Torvalds } 19336da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 19341da177e4SLinus Torvalds 19358af548dcSInaky Perez-Gonzalez /* 19363b29b68bSAlan Stern * Choose a device number. 19373b29b68bSAlan Stern * 19383b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 19393b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 19403b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 19413b29b68bSAlan Stern * and it usually is not the same as the device number. 19423b29b68bSAlan Stern * 19438af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 19448af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 19458af548dcSInaky Perez-Gonzalez * life of the device connection logic in 19468af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 19478af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 19488af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 19498af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 19508af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 19518af548dcSInaky Perez-Gonzalez * [X | 0x80]. 19528af548dcSInaky Perez-Gonzalez * 19538af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 19548af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 19558af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 19568af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 19578af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 1958c6515272SSarah Sharp * 1959c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 1960c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 1961c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 1962c6515272SSarah Sharp * command to the hardware. 19638af548dcSInaky Perez-Gonzalez */ 19643b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 19651da177e4SLinus Torvalds { 19661da177e4SLinus Torvalds int devnum; 19671da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 19681da177e4SLinus Torvalds 19691da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 19708af548dcSInaky Perez-Gonzalez if (udev->wusb) { 19718af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 19728af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 19738af548dcSInaky Perez-Gonzalez } else { 19748af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 19758af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 19761da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 19771da177e4SLinus Torvalds bus->devnum_next); 19781da177e4SLinus Torvalds if (devnum >= 128) 19798af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 19808af548dcSInaky Perez-Gonzalez 128, 1); 19811da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 19828af548dcSInaky Perez-Gonzalez } 19831da177e4SLinus Torvalds if (devnum < 128) { 19841da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 19851da177e4SLinus Torvalds udev->devnum = devnum; 19861da177e4SLinus Torvalds } 19871da177e4SLinus Torvalds } 19881da177e4SLinus Torvalds 19893b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 19901da177e4SLinus Torvalds { 19911da177e4SLinus Torvalds if (udev->devnum > 0) { 19921da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 19931da177e4SLinus Torvalds udev->devnum = -1; 19941da177e4SLinus Torvalds } 19951da177e4SLinus Torvalds } 19961da177e4SLinus Torvalds 19973b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 19984953d141SDavid Vrabel { 19994953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 20004953d141SDavid Vrabel if (!udev->wusb) 20014953d141SDavid Vrabel udev->devnum = devnum; 20024953d141SDavid Vrabel } 20034953d141SDavid Vrabel 2004f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 2005f7410cedSHerbert Xu { 2006f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2007f7410cedSHerbert Xu 2008f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 2009f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 2010f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 2011f7410cedSHerbert Xu } 2012f7410cedSHerbert Xu 20131da177e4SLinus Torvalds /** 20141da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 20151da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 20161da177e4SLinus Torvalds * Context: !in_interrupt () 20171da177e4SLinus Torvalds * 20181da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 20191da177e4SLinus Torvalds * 20201da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 20211da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 20221da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 20231da177e4SLinus Torvalds * 20241da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 20251da177e4SLinus Torvalds * controllers) should ever call this. 20261da177e4SLinus Torvalds * 20271da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 20281da177e4SLinus Torvalds */ 20291da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 20301da177e4SLinus Torvalds { 20311da177e4SLinus Torvalds struct usb_device *udev = *pdev; 2032ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 20331da177e4SLinus Torvalds int i; 20341da177e4SLinus Torvalds 20351da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 20361da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 203725985edcSLucas De Marchi * this quiesces everything except pending urbs. 20381da177e4SLinus Torvalds */ 20391da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 20403b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 20413b29b68bSAlan Stern udev->devnum); 20421da177e4SLinus Torvalds 20439ad3d6ccSAlan Stern usb_lock_device(udev); 20449ad3d6ccSAlan Stern 20451da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 20468816230eSHuajun Li for (i = 0; i < udev->maxchild; i++) { 2047ff823c79SLan Tianyu if (hub->ports[i]->child) 2048ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 20491da177e4SLinus Torvalds } 20501da177e4SLinus Torvalds 20511da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 20521da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 20531da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 20541da177e4SLinus Torvalds */ 2055782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 20561da177e4SLinus Torvalds usb_disable_device(udev, 0); 2057cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 20581da177e4SLinus Torvalds 2059fde26380SLan Tianyu if (udev->parent) { 2060ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2061ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2062fde26380SLan Tianyu 2063fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2064fde26380SLan Tianyu sysfs_remove_link(&port_dev->dev.kobj, "device"); 2065971fcd49SLan Tianyu 2066ad493e5eSLan Tianyu if (!port_dev->did_runtime_put) 2067971fcd49SLan Tianyu pm_runtime_put(&port_dev->dev); 2068ad493e5eSLan Tianyu else 2069ad493e5eSLan Tianyu port_dev->did_runtime_put = false; 2070fde26380SLan Tianyu } 2071fde26380SLan Tianyu 20723b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 2073782da727SAlan Stern usb_unlock_device(udev); 20743099e75aSGreg Kroah-Hartman 2075782da727SAlan Stern /* Unregister the device. The device driver is responsible 20763b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 20773b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2078782da727SAlan Stern */ 2079782da727SAlan Stern device_del(&udev->dev); 2080782da727SAlan Stern 2081782da727SAlan Stern /* Free the device number and delete the parent's children[] 20821da177e4SLinus Torvalds * (or root_hub) pointer. 20831da177e4SLinus Torvalds */ 20843b29b68bSAlan Stern release_devnum(udev); 20851da177e4SLinus Torvalds 20861da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 20871da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 20881da177e4SLinus Torvalds *pdev = NULL; 20891da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 20901da177e4SLinus Torvalds 2091f7410cedSHerbert Xu hub_free_dev(udev); 2092f7410cedSHerbert Xu 2093782da727SAlan Stern put_device(&udev->dev); 20941da177e4SLinus Torvalds } 20951da177e4SLinus Torvalds 2096f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 20971da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 20981da177e4SLinus Torvalds { 20991da177e4SLinus Torvalds if (!string) 21001da177e4SLinus Torvalds return; 2101f2ec522eSJoe Perches dev_info(&udev->dev, "%s: %s\n", id, string); 21021da177e4SLinus Torvalds } 21031da177e4SLinus Torvalds 2104f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 2105f2a383e4SGreg Kroah-Hartman { 2106f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 2107f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 2108f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 2109b9cef6c3SWu Fengguang dev_info(&udev->dev, 2110b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 2111f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 2112f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 2113f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 2114f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 2115f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 2116f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 2117f2a383e4SGreg Kroah-Hartman } 21181da177e4SLinus Torvalds #else 2119f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 21201da177e4SLinus Torvalds #endif 21211da177e4SLinus Torvalds 21221da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 21231da177e4SLinus Torvalds #include "otg_whitelist.h" 21241da177e4SLinus Torvalds #endif 21251da177e4SLinus Torvalds 21263ede760fSOliver Neukum /** 21278d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 21283ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 21293ede760fSOliver Neukum * 21308d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 2131626f090cSYacine Belkadi * 2132626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 21333ede760fSOliver Neukum */ 21348d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 21351da177e4SLinus Torvalds { 2136d9d16e8aSInaky Perez-Gonzalez int err = 0; 21371da177e4SLinus Torvalds 21381da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 21391da177e4SLinus Torvalds /* 21401da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 21411da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 21421da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 21431da177e4SLinus Torvalds */ 21441da177e4SLinus Torvalds if (!udev->bus->is_b_host 21451da177e4SLinus Torvalds && udev->config 21461da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 21472eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 21481da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 21491da177e4SLinus Torvalds 21501da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 21511da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 21521da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 21531da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 21541da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 215512c3da34SAlan Stern unsigned port1 = udev->portnum; 21561da177e4SLinus Torvalds 21571da177e4SLinus Torvalds dev_info(&udev->dev, 21581da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 21591da177e4SLinus Torvalds (port1 == bus->otg_port) 21601da177e4SLinus Torvalds ? "" : "non-"); 21611da177e4SLinus Torvalds 21621da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 21631da177e4SLinus Torvalds if (port1 == bus->otg_port) 21641da177e4SLinus Torvalds bus->b_hnp_enable = 1; 21651da177e4SLinus Torvalds err = usb_control_msg(udev, 21661da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 21671da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 21681da177e4SLinus Torvalds bus->b_hnp_enable 21691da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 21701da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 21711da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 21721da177e4SLinus Torvalds if (err < 0) { 21731da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 21741da177e4SLinus Torvalds * customize to match your product. 21751da177e4SLinus Torvalds */ 21761da177e4SLinus Torvalds dev_info(&udev->dev, 2177b9cef6c3SWu Fengguang "can't set HNP mode: %d\n", 21781da177e4SLinus Torvalds err); 21791da177e4SLinus Torvalds bus->b_hnp_enable = 0; 21801da177e4SLinus Torvalds } 21811da177e4SLinus Torvalds } 21821da177e4SLinus Torvalds } 21831da177e4SLinus Torvalds } 21841da177e4SLinus Torvalds 21851da177e4SLinus Torvalds if (!is_targeted(udev)) { 21861da177e4SLinus Torvalds 21871da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 21881da177e4SLinus Torvalds * (Includes HNP test device.) 21891da177e4SLinus Torvalds */ 21901da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 2191634a84f8SDavid Brownell err = usb_port_suspend(udev, PMSG_SUSPEND); 21921da177e4SLinus Torvalds if (err < 0) 21931da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 21941da177e4SLinus Torvalds } 2195ffcdc18dSVikram Pandita err = -ENOTSUPP; 21961da177e4SLinus Torvalds goto fail; 21971da177e4SLinus Torvalds } 2198d9d16e8aSInaky Perez-Gonzalez fail: 21991da177e4SLinus Torvalds #endif 2200d9d16e8aSInaky Perez-Gonzalez return err; 2201d9d16e8aSInaky Perez-Gonzalez } 22021da177e4SLinus Torvalds 2203d9d16e8aSInaky Perez-Gonzalez 2204d9d16e8aSInaky Perez-Gonzalez /** 22058d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 2206d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2207d9d16e8aSInaky Perez-Gonzalez * 2208d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 2209d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 2210d9d16e8aSInaky Perez-Gonzalez * environment. 2211d9d16e8aSInaky Perez-Gonzalez * 2212d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 2213d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 2214d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 2215626f090cSYacine Belkadi * 2216626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 2217d9d16e8aSInaky Perez-Gonzalez */ 22188d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 2219d9d16e8aSInaky Perez-Gonzalez { 2220d9d16e8aSInaky Perez-Gonzalez int err; 2221d9d16e8aSInaky Perez-Gonzalez 2222d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 2223d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 2224d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 2225e9e88fb7SAlan Stern if (err != -ENODEV) 2226d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 2227d9d16e8aSInaky Perez-Gonzalez err); 222880da2e0dSLaurent Pinchart return err; 2229d9d16e8aSInaky Perez-Gonzalez } 2230d9d16e8aSInaky Perez-Gonzalez } 2231d9d16e8aSInaky Perez-Gonzalez if (udev->wusb == 1 && udev->authorized == 0) { 2232d9d16e8aSInaky Perez-Gonzalez udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2233d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2234d9d16e8aSInaky Perez-Gonzalez udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2235d9d16e8aSInaky Perez-Gonzalez } 2236d9d16e8aSInaky Perez-Gonzalez else { 2237d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 2238d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 2239d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 2240d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 2241d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 2242d9d16e8aSInaky Perez-Gonzalez } 22438d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 224480da2e0dSLaurent Pinchart if (err < 0) 2245d9d16e8aSInaky Perez-Gonzalez return err; 224680da2e0dSLaurent Pinchart 224780da2e0dSLaurent Pinchart usb_detect_interface_quirks(udev); 224880da2e0dSLaurent Pinchart 224980da2e0dSLaurent Pinchart return 0; 2250d9d16e8aSInaky Perez-Gonzalez } 2251d9d16e8aSInaky Perez-Gonzalez 2252d35e70d5SMatthew Garrett static void set_usb_port_removable(struct usb_device *udev) 2253d35e70d5SMatthew Garrett { 2254d35e70d5SMatthew Garrett struct usb_device *hdev = udev->parent; 2255d35e70d5SMatthew Garrett struct usb_hub *hub; 2256d35e70d5SMatthew Garrett u8 port = udev->portnum; 2257d35e70d5SMatthew Garrett u16 wHubCharacteristics; 2258d35e70d5SMatthew Garrett bool removable = true; 2259d35e70d5SMatthew Garrett 2260d35e70d5SMatthew Garrett if (!hdev) 2261d35e70d5SMatthew Garrett return; 2262d35e70d5SMatthew Garrett 2263ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 2264d35e70d5SMatthew Garrett 2265d35e70d5SMatthew Garrett wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 2266d35e70d5SMatthew Garrett 2267d35e70d5SMatthew Garrett if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) 2268d35e70d5SMatthew Garrett return; 2269d35e70d5SMatthew Garrett 2270d35e70d5SMatthew Garrett if (hub_is_superspeed(hdev)) { 2271ca3c1539SLan Tianyu if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) 2272ca3c1539SLan Tianyu & (1 << port)) 2273d35e70d5SMatthew Garrett removable = false; 2274d35e70d5SMatthew Garrett } else { 2275d35e70d5SMatthew Garrett if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) 2276d35e70d5SMatthew Garrett removable = false; 2277d35e70d5SMatthew Garrett } 2278d35e70d5SMatthew Garrett 2279d35e70d5SMatthew Garrett if (removable) 2280d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 2281d35e70d5SMatthew Garrett else 2282d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 2283d35e70d5SMatthew Garrett } 2284d9d16e8aSInaky Perez-Gonzalez 2285d9d16e8aSInaky Perez-Gonzalez /** 2286d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 2287d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2288d9d16e8aSInaky Perez-Gonzalez * 22898d8558d1SAlan Stern * This is called with devices which have been detected but not fully 22908d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 2291d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 2292d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 2293d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 2294d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 2295d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 2296d9d16e8aSInaky Perez-Gonzalez * 2297d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 2298d9d16e8aSInaky Perez-Gonzalez * 2299d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 2300626f090cSYacine Belkadi * 2301626f090cSYacine Belkadi * Return: Whether the device is configured properly or not. Zero if the 2302626f090cSYacine Belkadi * interface was registered with the driver core; else a negative errno 2303626f090cSYacine Belkadi * value. 2304626f090cSYacine Belkadi * 2305d9d16e8aSInaky Perez-Gonzalez */ 2306d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 2307d9d16e8aSInaky Perez-Gonzalez { 2308d9d16e8aSInaky Perez-Gonzalez int err; 2309d9d16e8aSInaky Perez-Gonzalez 231016985408SDan Streetman if (udev->parent) { 231116985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 231216985408SDan Streetman * device (un)configuration controls wakeup capable 231316985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 231416985408SDan Streetman */ 231516985408SDan Streetman device_init_wakeup(&udev->dev, 0); 231616985408SDan Streetman } 231716985408SDan Streetman 23189bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 23199bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 2320c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 2321fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 23229bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 23239bbdf1e0SAlan Stern 2324c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 2325c08512c7SAlan Stern * allowed for hubs during binding. 2326c08512c7SAlan Stern */ 2327c08512c7SAlan Stern usb_disable_autosuspend(udev); 2328c08512c7SAlan Stern 23298d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 2330d9d16e8aSInaky Perez-Gonzalez if (err < 0) 2331d9d16e8aSInaky Perez-Gonzalez goto fail; 2332c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 2333c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 2334c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 23359f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 23369f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 23379f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 23389f8b17e6SKay Sievers 23396cd13201SAlan Stern /* Tell the world! */ 23406cd13201SAlan Stern announce_device(udev); 2341195af2ccSAlan Stern 2342b04b3156STheodore Ts'o if (udev->serial) 2343b04b3156STheodore Ts'o add_device_randomness(udev->serial, strlen(udev->serial)); 2344b04b3156STheodore Ts'o if (udev->product) 2345b04b3156STheodore Ts'o add_device_randomness(udev->product, strlen(udev->product)); 2346b04b3156STheodore Ts'o if (udev->manufacturer) 2347b04b3156STheodore Ts'o add_device_randomness(udev->manufacturer, 2348b04b3156STheodore Ts'o strlen(udev->manufacturer)); 2349b04b3156STheodore Ts'o 2350927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 2351d35e70d5SMatthew Garrett 2352d35e70d5SMatthew Garrett /* 2353d35e70d5SMatthew Garrett * check whether the hub marks this port as non-removable. Do it 2354d35e70d5SMatthew Garrett * now so that platform-specific data can override it in 2355d35e70d5SMatthew Garrett * device_add() 2356d35e70d5SMatthew Garrett */ 2357d35e70d5SMatthew Garrett if (udev->parent) 2358d35e70d5SMatthew Garrett set_usb_port_removable(udev); 2359d35e70d5SMatthew Garrett 2360782da727SAlan Stern /* Register the device. The device driver is responsible 23613b23dd6fSAlan Stern * for configuring the device and invoking the add-device 23623b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2363782da727SAlan Stern */ 23641da177e4SLinus Torvalds err = device_add(&udev->dev); 23651da177e4SLinus Torvalds if (err) { 23661da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 23671da177e4SLinus Torvalds goto fail; 23681da177e4SLinus Torvalds } 23699ad3d6ccSAlan Stern 2370fde26380SLan Tianyu /* Create link files between child device and usb port device. */ 2371fde26380SLan Tianyu if (udev->parent) { 2372ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2373ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2374fde26380SLan Tianyu 2375fde26380SLan Tianyu err = sysfs_create_link(&udev->dev.kobj, 2376fde26380SLan Tianyu &port_dev->dev.kobj, "port"); 2377fde26380SLan Tianyu if (err) 2378fde26380SLan Tianyu goto fail; 2379fde26380SLan Tianyu 2380fde26380SLan Tianyu err = sysfs_create_link(&port_dev->dev.kobj, 2381fde26380SLan Tianyu &udev->dev.kobj, "device"); 2382fde26380SLan Tianyu if (err) { 2383fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2384fde26380SLan Tianyu goto fail; 2385fde26380SLan Tianyu } 2386971fcd49SLan Tianyu 2387971fcd49SLan Tianyu pm_runtime_get_sync(&port_dev->dev); 2388fde26380SLan Tianyu } 2389fde26380SLan Tianyu 23903b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 2391c08512c7SAlan Stern usb_mark_last_busy(udev); 2392c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 2393c066475eSGreg Kroah-Hartman return err; 23941da177e4SLinus Torvalds 23951da177e4SLinus Torvalds fail: 23961da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 23979bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 23989bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 2399d9d16e8aSInaky Perez-Gonzalez return err; 24001da177e4SLinus Torvalds } 24011da177e4SLinus Torvalds 240293993a0aSInaky Perez-Gonzalez 240393993a0aSInaky Perez-Gonzalez /** 2404fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 2405fd39c86bSRandy Dunlap * @usb_dev: USB device 2406fd39c86bSRandy Dunlap * 2407fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 2408fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 240993993a0aSInaky Perez-Gonzalez * 241093993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 241193993a0aSInaky Perez-Gonzalez * defer its call. 2412626f090cSYacine Belkadi * 2413626f090cSYacine Belkadi * Return: 0. 241493993a0aSInaky Perez-Gonzalez */ 241593993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 241693993a0aSInaky Perez-Gonzalez { 241793993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 241893993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 241993993a0aSInaky Perez-Gonzalez goto out_unauthorized; 2420da307123SAlan Stern 242193993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 242293993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 2423da307123SAlan Stern 2424da307123SAlan Stern kfree(usb_dev->product); 242593993a0aSInaky Perez-Gonzalez usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2426da307123SAlan Stern kfree(usb_dev->manufacturer); 242793993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2428da307123SAlan Stern kfree(usb_dev->serial); 242993993a0aSInaky Perez-Gonzalez usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2430da307123SAlan Stern 2431da307123SAlan Stern usb_destroy_configuration(usb_dev); 243293993a0aSInaky Perez-Gonzalez usb_dev->descriptor.bNumConfigurations = 0; 2433da307123SAlan Stern 243493993a0aSInaky Perez-Gonzalez out_unauthorized: 243593993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 243693993a0aSInaky Perez-Gonzalez return 0; 243793993a0aSInaky Perez-Gonzalez } 243893993a0aSInaky Perez-Gonzalez 243993993a0aSInaky Perez-Gonzalez 244093993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 244193993a0aSInaky Perez-Gonzalez { 244293993a0aSInaky Perez-Gonzalez int result = 0, c; 2443da307123SAlan Stern 244493993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 244593993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 244693993a0aSInaky Perez-Gonzalez goto out_authorized; 2447da307123SAlan Stern 244893993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 244993993a0aSInaky Perez-Gonzalez if (result < 0) { 245093993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 245193993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 245293993a0aSInaky Perez-Gonzalez goto error_autoresume; 245393993a0aSInaky Perez-Gonzalez } 245493993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 245593993a0aSInaky Perez-Gonzalez if (result < 0) { 245693993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 245793993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 245893993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 245993993a0aSInaky Perez-Gonzalez } 2460da307123SAlan Stern 2461da307123SAlan Stern kfree(usb_dev->product); 2462da307123SAlan Stern usb_dev->product = NULL; 2463da307123SAlan Stern kfree(usb_dev->manufacturer); 2464da307123SAlan Stern usb_dev->manufacturer = NULL; 2465da307123SAlan Stern kfree(usb_dev->serial); 2466da307123SAlan Stern usb_dev->serial = NULL; 2467da307123SAlan Stern 246893993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 24698d8558d1SAlan Stern result = usb_enumerate_device(usb_dev); 247093993a0aSInaky Perez-Gonzalez if (result < 0) 24718d8558d1SAlan Stern goto error_enumerate; 247293993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 247393993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 247493993a0aSInaky Perez-Gonzalez */ 2475b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 247693993a0aSInaky Perez-Gonzalez if (c >= 0) { 247793993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 247893993a0aSInaky Perez-Gonzalez if (result) { 247993993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 248093993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 248193993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 248293993a0aSInaky Perez-Gonzalez * set other configurations. */ 248393993a0aSInaky Perez-Gonzalez } 248493993a0aSInaky Perez-Gonzalez } 248593993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2486da307123SAlan Stern 24878d8558d1SAlan Stern error_enumerate: 248893993a0aSInaky Perez-Gonzalez error_device_descriptor: 2489da307123SAlan Stern usb_autosuspend_device(usb_dev); 249093993a0aSInaky Perez-Gonzalez error_autoresume: 249193993a0aSInaky Perez-Gonzalez out_authorized: 249293993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); // complements locktree 249393993a0aSInaky Perez-Gonzalez return result; 249493993a0aSInaky Perez-Gonzalez } 249593993a0aSInaky Perez-Gonzalez 249693993a0aSInaky Perez-Gonzalez 24970165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 24980165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 24990165de09SInaky Perez-Gonzalez { 25000165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 25010165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 25020165de09SInaky Perez-Gonzalez return 0; 25030165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 25040165de09SInaky Perez-Gonzalez return hcd->wireless; 25050165de09SInaky Perez-Gonzalez } 25060165de09SInaky Perez-Gonzalez 25070165de09SInaky Perez-Gonzalez 25081da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 25091da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 25101da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 25111da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 251290ab5ee9SRusty Russell #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) 25131da177e4SLinus Torvalds 25141da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 25151da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 251675d7cf72SAndiry Xu #define HUB_BH_RESET_TIME 50 25171da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 251877c7f072SSarah Sharp #define HUB_RESET_TIMEOUT 800 25191da177e4SLinus Torvalds 252010d674a8SSarah Sharp static int hub_port_reset(struct usb_hub *hub, int port1, 252110d674a8SSarah Sharp struct usb_device *udev, unsigned int delay, bool warm); 252210d674a8SSarah Sharp 25238bea2bd3SStanislaw Ledwon /* Is a USB 3.0 port in the Inactive or Complinance Mode state? 25248bea2bd3SStanislaw Ledwon * Port worm reset is required to recover 25258bea2bd3SStanislaw Ledwon */ 25268bea2bd3SStanislaw Ledwon static bool hub_port_warm_reset_required(struct usb_hub *hub, u16 portstatus) 252710d674a8SSarah Sharp { 252810d674a8SSarah Sharp return hub_is_superspeed(hub->hdev) && 25298bea2bd3SStanislaw Ledwon (((portstatus & USB_PORT_STAT_LINK_STATE) == 25308bea2bd3SStanislaw Ledwon USB_SS_PORT_LS_SS_INACTIVE) || 25318bea2bd3SStanislaw Ledwon ((portstatus & USB_PORT_STAT_LINK_STATE) == 25328bea2bd3SStanislaw Ledwon USB_SS_PORT_LS_COMP_MOD)) ; 253310d674a8SSarah Sharp } 253410d674a8SSarah Sharp 25351da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 253675d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 25371da177e4SLinus Torvalds { 25381da177e4SLinus Torvalds int delay_time, ret; 25391da177e4SLinus Torvalds u16 portstatus; 25401da177e4SLinus Torvalds u16 portchange; 25411da177e4SLinus Torvalds 25421da177e4SLinus Torvalds for (delay_time = 0; 25431da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 25441da177e4SLinus Torvalds delay_time += delay) { 25451da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 25461da177e4SLinus Torvalds msleep(delay); 25471da177e4SLinus Torvalds 25481da177e4SLinus Torvalds /* read and decode port status */ 25491da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 25501da177e4SLinus Torvalds if (ret < 0) 25511da177e4SLinus Torvalds return ret; 25521da177e4SLinus Torvalds 25534f43447eSSarah Sharp /* The port state is unknown until the reset completes. */ 2554470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_RESET)) 2555470f0be8SSarah Sharp break; 2556470f0be8SSarah Sharp 2557470f0be8SSarah Sharp /* switch to the long delay after two short delay failures */ 2558470f0be8SSarah Sharp if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 2559470f0be8SSarah Sharp delay = HUB_LONG_RESET_TIME; 2560470f0be8SSarah Sharp 2561470f0be8SSarah Sharp dev_dbg (hub->intfdev, 2562470f0be8SSarah Sharp "port %d not %sreset yet, waiting %dms\n", 2563470f0be8SSarah Sharp port1, warm ? "warm " : "", delay); 2564470f0be8SSarah Sharp } 2565470f0be8SSarah Sharp 25664f43447eSSarah Sharp if ((portstatus & USB_PORT_STAT_RESET)) 2567470f0be8SSarah Sharp return -EBUSY; 25684f43447eSSarah Sharp 2569a24a6078SSarah Sharp if (hub_port_warm_reset_required(hub, portstatus)) 2570a24a6078SSarah Sharp return -ENOTCONN; 257110d674a8SSarah Sharp 25721da177e4SLinus Torvalds /* Device went away? */ 25731da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 25741da177e4SLinus Torvalds return -ENOTCONN; 25751da177e4SLinus Torvalds 2576a24a6078SSarah Sharp /* bomb out completely if the connection bounced. A USB 3.0 2577a24a6078SSarah Sharp * connection may bounce if multiple warm resets were issued, 2578a24a6078SSarah Sharp * but the device may have successfully re-connected. Ignore it. 2579a24a6078SSarah Sharp */ 2580a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev) && 2581a24a6078SSarah Sharp (portchange & USB_PORT_STAT_C_CONNECTION)) 2582dd4dd19eSAlan Stern return -ENOTCONN; 25831da177e4SLinus Torvalds 2584470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_ENABLE)) 2585470f0be8SSarah Sharp return -EBUSY; 2586470f0be8SSarah Sharp 25872d4fa940SSarah Sharp if (!udev) 25882d4fa940SSarah Sharp return 0; 25892d4fa940SSarah Sharp 25900165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2591551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 2592131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2593809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 25940165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 25951da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 25961da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 25971da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 25981da177e4SLinus Torvalds else 25991da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 26001da177e4SLinus Torvalds return 0; 26011da177e4SLinus Torvalds } 26021da177e4SLinus Torvalds 260375d7cf72SAndiry Xu static void hub_port_finish_reset(struct usb_hub *hub, int port1, 2604a24a6078SSarah Sharp struct usb_device *udev, int *status) 26051da177e4SLinus Torvalds { 260675d7cf72SAndiry Xu switch (*status) { 26071da177e4SLinus Torvalds case 0: 2608b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 2609b789696aSDavid Brownell msleep(10 + 40); 26102d4fa940SSarah Sharp if (udev) { 2611a24a6078SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2612a24a6078SSarah Sharp 26133b29b68bSAlan Stern update_devnum(udev, 0); 2614a24a6078SSarah Sharp /* The xHC may think the device is already reset, 2615a24a6078SSarah Sharp * so ignore the status. 26168b8132bcSSarah Sharp */ 26178b8132bcSSarah Sharp if (hcd->driver->reset_device) 26188b8132bcSSarah Sharp hcd->driver->reset_device(hcd, udev); 261975d7cf72SAndiry Xu } 26201da177e4SLinus Torvalds /* FALL THROUGH */ 26211da177e4SLinus Torvalds case -ENOTCONN: 26221da177e4SLinus Torvalds case -ENODEV: 2623ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, 26241da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 26251c7439c6SSarah Sharp if (hub_is_superspeed(hub->hdev)) { 2626ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 262775d7cf72SAndiry Xu USB_PORT_FEAT_C_BH_PORT_RESET); 2628ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 262975d7cf72SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 2630ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2631a24a6078SSarah Sharp USB_PORT_FEAT_C_CONNECTION); 26321c7439c6SSarah Sharp } 2633a24a6078SSarah Sharp if (udev) 263475d7cf72SAndiry Xu usb_set_device_state(udev, *status 26351da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 26361da177e4SLinus Torvalds : USB_STATE_DEFAULT); 263775d7cf72SAndiry Xu break; 263875d7cf72SAndiry Xu } 263975d7cf72SAndiry Xu } 264075d7cf72SAndiry Xu 264175d7cf72SAndiry Xu /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ 264275d7cf72SAndiry Xu static int hub_port_reset(struct usb_hub *hub, int port1, 264375d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 264475d7cf72SAndiry Xu { 264575d7cf72SAndiry Xu int i, status; 2646a24a6078SSarah Sharp u16 portchange, portstatus; 264775d7cf72SAndiry Xu 264875d7cf72SAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 26490fe51aa5SSarah Sharp if (warm) { 265075d7cf72SAndiry Xu dev_err(hub->intfdev, "only USB3 hub support " 265175d7cf72SAndiry Xu "warm reset\n"); 265275d7cf72SAndiry Xu return -EINVAL; 265375d7cf72SAndiry Xu } 26540fe51aa5SSarah Sharp /* Block EHCI CF initialization during the port reset. 26550fe51aa5SSarah Sharp * Some companion controllers don't like it when they mix. 26560fe51aa5SSarah Sharp */ 26570fe51aa5SSarah Sharp down_read(&ehci_cf_port_reset_rwsem); 2658d3b9d7a9SSarah Sharp } else if (!warm) { 2659d3b9d7a9SSarah Sharp /* 2660d3b9d7a9SSarah Sharp * If the caller hasn't explicitly requested a warm reset, 2661d3b9d7a9SSarah Sharp * double check and see if one is needed. 2662d3b9d7a9SSarah Sharp */ 2663d3b9d7a9SSarah Sharp status = hub_port_status(hub, port1, 2664d3b9d7a9SSarah Sharp &portstatus, &portchange); 2665d3b9d7a9SSarah Sharp if (status < 0) 2666d3b9d7a9SSarah Sharp goto done; 2667d3b9d7a9SSarah Sharp 2668d3b9d7a9SSarah Sharp if (hub_port_warm_reset_required(hub, portstatus)) 2669d3b9d7a9SSarah Sharp warm = true; 267075d7cf72SAndiry Xu } 267175d7cf72SAndiry Xu 267275d7cf72SAndiry Xu /* Reset the port */ 267375d7cf72SAndiry Xu for (i = 0; i < PORT_RESET_TRIES; i++) { 267475d7cf72SAndiry Xu status = set_port_feature(hub->hdev, port1, (warm ? 267575d7cf72SAndiry Xu USB_PORT_FEAT_BH_PORT_RESET : 267675d7cf72SAndiry Xu USB_PORT_FEAT_RESET)); 2677e9e88fb7SAlan Stern if (status == -ENODEV) { 2678e9e88fb7SAlan Stern ; /* The hub is gone */ 2679e9e88fb7SAlan Stern } else if (status) { 268075d7cf72SAndiry Xu dev_err(hub->intfdev, 268175d7cf72SAndiry Xu "cannot %sreset port %d (err = %d)\n", 268275d7cf72SAndiry Xu warm ? "warm " : "", port1, status); 268375d7cf72SAndiry Xu } else { 268475d7cf72SAndiry Xu status = hub_port_wait_reset(hub, port1, udev, delay, 268575d7cf72SAndiry Xu warm); 2686e9e88fb7SAlan Stern if (status && status != -ENOTCONN && status != -ENODEV) 268775d7cf72SAndiry Xu dev_dbg(hub->intfdev, 268875d7cf72SAndiry Xu "port_wait_reset: err = %d\n", 268975d7cf72SAndiry Xu status); 269075d7cf72SAndiry Xu } 269175d7cf72SAndiry Xu 2692a24a6078SSarah Sharp /* Check for disconnect or reset */ 269375d7cf72SAndiry Xu if (status == 0 || status == -ENOTCONN || status == -ENODEV) { 2694a24a6078SSarah Sharp hub_port_finish_reset(hub, port1, udev, &status); 2695a24a6078SSarah Sharp 2696a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 269732fe0198SAlan Stern goto done; 2698a24a6078SSarah Sharp 2699a24a6078SSarah Sharp /* 2700a24a6078SSarah Sharp * If a USB 3.0 device migrates from reset to an error 2701a24a6078SSarah Sharp * state, re-issue the warm reset. 2702a24a6078SSarah Sharp */ 2703a24a6078SSarah Sharp if (hub_port_status(hub, port1, 2704a24a6078SSarah Sharp &portstatus, &portchange) < 0) 2705a24a6078SSarah Sharp goto done; 2706a24a6078SSarah Sharp 2707a24a6078SSarah Sharp if (!hub_port_warm_reset_required(hub, portstatus)) 2708a24a6078SSarah Sharp goto done; 2709a24a6078SSarah Sharp 2710a24a6078SSarah Sharp /* 2711a24a6078SSarah Sharp * If the port is in SS.Inactive or Compliance Mode, the 2712a24a6078SSarah Sharp * hot or warm reset failed. Try another warm reset. 2713a24a6078SSarah Sharp */ 2714a24a6078SSarah Sharp if (!warm) { 2715a24a6078SSarah Sharp dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n", 2716a24a6078SSarah Sharp port1); 2717a24a6078SSarah Sharp warm = true; 2718a24a6078SSarah Sharp } 27191da177e4SLinus Torvalds } 27201da177e4SLinus Torvalds 27211da177e4SLinus Torvalds dev_dbg (hub->intfdev, 272275d7cf72SAndiry Xu "port %d not enabled, trying %sreset again...\n", 272375d7cf72SAndiry Xu port1, warm ? "warm " : ""); 27241da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 27251da177e4SLinus Torvalds } 27261da177e4SLinus Torvalds 27271da177e4SLinus Torvalds dev_err (hub->intfdev, 27281da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 27291da177e4SLinus Torvalds port1); 27301da177e4SLinus Torvalds 273132fe0198SAlan Stern done: 27320fe51aa5SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 273332fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 273475d7cf72SAndiry Xu 27351da177e4SLinus Torvalds return status; 27361da177e4SLinus Torvalds } 27371da177e4SLinus Torvalds 27380ed9a57eSAndiry Xu /* Check if a port is power on */ 27390ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 27400ed9a57eSAndiry Xu { 27410ed9a57eSAndiry Xu int ret = 0; 27420ed9a57eSAndiry Xu 27430ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 27440ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 27450ed9a57eSAndiry Xu ret = 1; 27460ed9a57eSAndiry Xu } else { 27470ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 27480ed9a57eSAndiry Xu ret = 1; 27490ed9a57eSAndiry Xu } 27500ed9a57eSAndiry Xu 27510ed9a57eSAndiry Xu return ret; 27520ed9a57eSAndiry Xu } 27530ed9a57eSAndiry Xu 2754d388dab7SAlan Stern #ifdef CONFIG_PM 27551da177e4SLinus Torvalds 27560ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 27570ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 27580ed9a57eSAndiry Xu { 27590ed9a57eSAndiry Xu int ret = 0; 27600ed9a57eSAndiry Xu 27610ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 27620ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 27630ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 27640ed9a57eSAndiry Xu ret = 1; 27650ed9a57eSAndiry Xu } else { 27660ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 27670ed9a57eSAndiry Xu ret = 1; 27680ed9a57eSAndiry Xu } 27690ed9a57eSAndiry Xu 27700ed9a57eSAndiry Xu return ret; 27710ed9a57eSAndiry Xu } 2772b01b03f3SAlan Stern 2773b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2774b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2775b01b03f3SAlan Stern */ 2776b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2777b01b03f3SAlan Stern struct usb_hub *hub, int port1, 2778b01b03f3SAlan Stern int status, unsigned portchange, unsigned portstatus) 2779b01b03f3SAlan Stern { 2780b01b03f3SAlan Stern /* Is the device still present? */ 27810ed9a57eSAndiry Xu if (status || port_is_suspended(hub, portstatus) || 27820ed9a57eSAndiry Xu !port_is_power_on(hub, portstatus) || 27830ed9a57eSAndiry Xu !(portstatus & USB_PORT_STAT_CONNECTION)) { 2784b01b03f3SAlan Stern if (status >= 0) 2785b01b03f3SAlan Stern status = -ENODEV; 2786b01b03f3SAlan Stern } 2787b01b03f3SAlan Stern 278886c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 278986c57edfSAlan Stern * so try a reset-resume instead. 279086c57edfSAlan Stern */ 279186c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 279286c57edfSAlan Stern if (udev->persist_enabled) 279386c57edfSAlan Stern udev->reset_resume = 1; 279486c57edfSAlan Stern else 2795b01b03f3SAlan Stern status = -ENODEV; 279686c57edfSAlan Stern } 2797b01b03f3SAlan Stern 2798b01b03f3SAlan Stern if (status) { 2799b01b03f3SAlan Stern dev_dbg(hub->intfdev, 2800b01b03f3SAlan Stern "port %d status %04x.%04x after resume, %d\n", 2801b01b03f3SAlan Stern port1, portchange, portstatus, status); 2802b01b03f3SAlan Stern } else if (udev->reset_resume) { 2803b01b03f3SAlan Stern 2804b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2805b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2806ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2807b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2808b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2809ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2810b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2811b01b03f3SAlan Stern } 2812b01b03f3SAlan Stern 2813b01b03f3SAlan Stern return status; 2814b01b03f3SAlan Stern } 2815b01b03f3SAlan Stern 2816f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 2817f74631e3SSarah Sharp { 2818f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2819f74631e3SSarah Sharp 2820f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2821f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2822f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2823f74631e3SSarah Sharp return 0; 2824f74631e3SSarah Sharp 2825f74631e3SSarah Sharp /* Clear Feature LTM Enable can only be sent if the device is 2826f74631e3SSarah Sharp * configured. 2827f74631e3SSarah Sharp */ 2828f74631e3SSarah Sharp if (!udev->actconfig) 2829f74631e3SSarah Sharp return 0; 2830f74631e3SSarah Sharp 2831f74631e3SSarah Sharp return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2832f74631e3SSarah Sharp USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2833f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2834f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2835f74631e3SSarah Sharp } 2836f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 2837f74631e3SSarah Sharp 2838f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) 2839f74631e3SSarah Sharp { 2840f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2841f74631e3SSarah Sharp 2842f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2843f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2844f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2845f74631e3SSarah Sharp return; 2846f74631e3SSarah Sharp 2847f74631e3SSarah Sharp /* Set Feature LTM Enable can only be sent if the device is 2848f74631e3SSarah Sharp * configured. 2849f74631e3SSarah Sharp */ 2850f74631e3SSarah Sharp if (!udev->actconfig) 2851f74631e3SSarah Sharp return; 2852f74631e3SSarah Sharp 2853f74631e3SSarah Sharp usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2854f74631e3SSarah Sharp USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2855f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2856f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2857f74631e3SSarah Sharp } 2858f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 2859f74631e3SSarah Sharp 286054a3ac0cSLan Tianyu /* 286128e86165SAlan Stern * usb_enable_remote_wakeup - enable remote wakeup for a device 286254a3ac0cSLan Tianyu * @udev: target device 286354a3ac0cSLan Tianyu * 286428e86165SAlan Stern * For USB-2 devices: Set the device's remote wakeup feature. 286528e86165SAlan Stern * 286628e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 286728e86165SAlan Stern * enable remote wake for the first interface. FIXME if the interface 286828e86165SAlan Stern * association descriptor shows there's more than one function. 286954a3ac0cSLan Tianyu */ 287028e86165SAlan Stern static int usb_enable_remote_wakeup(struct usb_device *udev) 287154a3ac0cSLan Tianyu { 287228e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 287328e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 287428e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 287528e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 287628e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 287728e86165SAlan Stern else 287828e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 287928e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, 288028e86165SAlan Stern USB_INTRF_FUNC_SUSPEND, 288128e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_RW | 288228e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_LP, 288328e86165SAlan Stern NULL, 0, USB_CTRL_SET_TIMEOUT); 288428e86165SAlan Stern } 288528e86165SAlan Stern 288628e86165SAlan Stern /* 288728e86165SAlan Stern * usb_disable_remote_wakeup - disable remote wakeup for a device 288828e86165SAlan Stern * @udev: target device 288928e86165SAlan Stern * 289028e86165SAlan Stern * For USB-2 devices: Clear the device's remote wakeup feature. 289128e86165SAlan Stern * 289228e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 289328e86165SAlan Stern * disable remote wake for the first interface. FIXME if the interface 289428e86165SAlan Stern * association descriptor shows there's more than one function. 289528e86165SAlan Stern */ 289628e86165SAlan Stern static int usb_disable_remote_wakeup(struct usb_device *udev) 289728e86165SAlan Stern { 289828e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 289928e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 290028e86165SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 290128e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 290228e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 290328e86165SAlan Stern else 290454a3ac0cSLan Tianyu return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 290554a3ac0cSLan Tianyu USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, 290654a3ac0cSLan Tianyu USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, 290754a3ac0cSLan Tianyu USB_CTRL_SET_TIMEOUT); 290854a3ac0cSLan Tianyu } 29091da177e4SLinus Torvalds 2910e583d9dbSAlan Stern /* Count of wakeup-enabled devices at or below udev */ 2911e583d9dbSAlan Stern static unsigned wakeup_enabled_descendants(struct usb_device *udev) 2912e583d9dbSAlan Stern { 2913e583d9dbSAlan Stern struct usb_hub *hub = usb_hub_to_struct_hub(udev); 2914e583d9dbSAlan Stern 2915e583d9dbSAlan Stern return udev->do_remote_wakeup + 2916e583d9dbSAlan Stern (hub ? hub->wakeup_enabled_descendants : 0); 2917e583d9dbSAlan Stern } 2918e583d9dbSAlan Stern 29191da177e4SLinus Torvalds /* 2920140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 2921624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 29225edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 29231da177e4SLinus Torvalds * 29241da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 29251da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 29261da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 2927140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 29281da177e4SLinus Torvalds * to disconnect devices while they are suspended. 29291da177e4SLinus Torvalds * 2930390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 2931390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 2932390a8c34SDavid Brownell * 2933624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 2934624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 2935624d6c07SAlan Stern * All devices below the suspended port are also suspended. 2936624d6c07SAlan Stern * 2937624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 2938624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 2939624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 2940624d6c07SAlan Stern * some cases, this wakes the USB host. 2941624d6c07SAlan Stern * 29421da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 29431da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 29441da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 29451da177e4SLinus Torvalds * 29464956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 29474956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 29484956eccdSAlan Stern * State transitions include: 29494956eccdSAlan Stern * 29504956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 29514956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 29524956eccdSAlan Stern * 29534956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 29544956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 29554956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 29564956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 29574956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 29584956eccdSAlan Stern * 2959e583d9dbSAlan Stern * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get 2960e583d9dbSAlan Stern * suspended until their bus goes into global suspend (i.e., the root 29610aa2832dSAlan Stern * hub is suspended). Nevertheless, we change @udev->state to 29620aa2832dSAlan Stern * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual 29630aa2832dSAlan Stern * upstream port setting is stored in @udev->port_is_suspended. 29644956eccdSAlan Stern * 29651da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 29661da177e4SLinus Torvalds */ 296765bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 29681da177e4SLinus Torvalds { 2969ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2970ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2971624d6c07SAlan Stern int port1 = udev->portnum; 2972624d6c07SAlan Stern int status; 29730aa2832dSAlan Stern bool really_suspend = true; 29744956eccdSAlan Stern 2975624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 2976624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 2977624d6c07SAlan Stern * 2978624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 2979624d6c07SAlan Stern * we don't explicitly enable it here. 2980624d6c07SAlan Stern */ 2981624d6c07SAlan Stern if (udev->do_remote_wakeup) { 298228e86165SAlan Stern status = usb_enable_remote_wakeup(udev); 29830c487206SOliver Neukum if (status) { 2984624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 2985624d6c07SAlan Stern status); 29860c487206SOliver Neukum /* bail if autosuspend is requested */ 29875b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 29884fae6f0fSAlan Stern goto err_wakeup; 29890c487206SOliver Neukum } 2990624d6c07SAlan Stern } 2991624d6c07SAlan Stern 299265580b43SAndiry Xu /* disable USB2 hardware LPM */ 299365580b43SAndiry Xu if (udev->usb2_hw_lpm_enabled == 1) 299465580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 0); 299565580b43SAndiry Xu 2996f74631e3SSarah Sharp if (usb_disable_ltm(udev)) { 29974fae6f0fSAlan Stern dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); 29984fae6f0fSAlan Stern status = -ENOMEM; 29994fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 30004fae6f0fSAlan Stern goto err_ltm; 3001f74631e3SSarah Sharp } 30028306095fSSarah Sharp if (usb_unlocked_disable_lpm(udev)) { 30034fae6f0fSAlan Stern dev_err(&udev->dev, "Failed to disable LPM before suspend\n."); 30044fae6f0fSAlan Stern status = -ENOMEM; 30054fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 30064fae6f0fSAlan Stern goto err_lpm3; 30078306095fSSarah Sharp } 30088306095fSSarah Sharp 3009624d6c07SAlan Stern /* see 7.1.7.6 */ 3010a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3011c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); 3012e583d9dbSAlan Stern 30130aa2832dSAlan Stern /* 30140aa2832dSAlan Stern * For system suspend, we do not need to enable the suspend feature 30150aa2832dSAlan Stern * on individual USB-2 ports. The devices will automatically go 30160aa2832dSAlan Stern * into suspend a few ms after the root hub stops sending packets. 30170aa2832dSAlan Stern * The USB 2.0 spec calls this "global suspend". 3018e583d9dbSAlan Stern * 3019e583d9dbSAlan Stern * However, many USB hubs have a bug: They don't relay wakeup requests 3020e583d9dbSAlan Stern * from a downstream port if the port's suspend feature isn't on. 3021e583d9dbSAlan Stern * Therefore we will turn on the suspend feature if udev or any of its 3022e583d9dbSAlan Stern * descendants is enabled for remote wakeup. 30230aa2832dSAlan Stern */ 3024e583d9dbSAlan Stern else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) 3025e583d9dbSAlan Stern status = set_port_feature(hub->hdev, port1, 3026e583d9dbSAlan Stern USB_PORT_FEAT_SUSPEND); 30270aa2832dSAlan Stern else { 30280aa2832dSAlan Stern really_suspend = false; 30290aa2832dSAlan Stern status = 0; 30300aa2832dSAlan Stern } 3031624d6c07SAlan Stern if (status) { 3032624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 3033624d6c07SAlan Stern port1, status); 3034cbb33004SAlan Stern 30354fae6f0fSAlan Stern /* Try to enable USB3 LPM and LTM again */ 30364fae6f0fSAlan Stern usb_unlocked_enable_lpm(udev); 30374fae6f0fSAlan Stern err_lpm3: 30384fae6f0fSAlan Stern usb_enable_ltm(udev); 30394fae6f0fSAlan Stern err_ltm: 3040c3e751e4SAndiry Xu /* Try to enable USB2 hardware LPM again */ 3041c3e751e4SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 3042c3e751e4SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 3043c3e751e4SAndiry Xu 30444fae6f0fSAlan Stern if (udev->do_remote_wakeup) 30454fae6f0fSAlan Stern (void) usb_disable_remote_wakeup(udev); 30464fae6f0fSAlan Stern err_wakeup: 30478306095fSSarah Sharp 3048cbb33004SAlan Stern /* System sleep transitions should never fail */ 30495b1b0b81SAlan Stern if (!PMSG_IS_AUTO(msg)) 3050cbb33004SAlan Stern status = 0; 3051624d6c07SAlan Stern } else { 305230b1a7a3SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", 305330b1a7a3SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : ""), 305430b1a7a3SAlan Stern udev->do_remote_wakeup); 30550aa2832dSAlan Stern if (really_suspend) { 3056bfd1e910SAlan Stern udev->port_is_suspended = 1; 3057e583d9dbSAlan Stern 3058e583d9dbSAlan Stern /* device has up to 10 msec to fully suspend */ 3059624d6c07SAlan Stern msleep(10); 3060624d6c07SAlan Stern } 3061e583d9dbSAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 30620aa2832dSAlan Stern } 3063ad493e5eSLan Tianyu 30644fae6f0fSAlan Stern if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled) { 3065ad493e5eSLan Tianyu pm_runtime_put_sync(&port_dev->dev); 3066ad493e5eSLan Tianyu port_dev->did_runtime_put = true; 3067ad493e5eSLan Tianyu } 3068ad493e5eSLan Tianyu 3069c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 30704956eccdSAlan Stern return status; 30711da177e4SLinus Torvalds } 3072f3f3253dSDavid Brownell 30731da177e4SLinus Torvalds /* 3074390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 3075390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 307654515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 30771da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 30781da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 30791da177e4SLinus Torvalds * in the tree that's rooted at this device. 308054515fe5SAlan Stern * 308154515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 308254515fe5SAlan Stern * status check is done. 30831da177e4SLinus Torvalds */ 3084140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 30851da177e4SLinus Torvalds { 308654515fe5SAlan Stern int status = 0; 308707e72b95SOliver Neukum u16 devstatus = 0; 30881da177e4SLinus Torvalds 30891da177e4SLinus Torvalds /* caller owns the udev device lock */ 3090b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 3091b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 30921da177e4SLinus Torvalds 30931da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 30941da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 30951da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 30961da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 30971da177e4SLinus Torvalds */ 30981da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 30991da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 31001da177e4SLinus Torvalds : USB_STATE_ADDRESS); 31011da177e4SLinus Torvalds 310254515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 310354515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 310454515fe5SAlan Stern * operation is carried out here, after the port has been 310554515fe5SAlan Stern * resumed. 310654515fe5SAlan Stern */ 310754515fe5SAlan Stern if (udev->reset_resume) 310886c57edfSAlan Stern retry_reset_resume: 3109742120c6SMing Lei status = usb_reset_and_verify_device(udev); 311054515fe5SAlan Stern 31111da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 31121da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 31131da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 31141da177e4SLinus Torvalds */ 311554515fe5SAlan Stern if (status == 0) { 311646dede46SAlan Stern devstatus = 0; 31171da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 311886c57edfSAlan Stern 311986c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 312086c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 312186c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 312286c57edfSAlan Stern udev->reset_resume = 1; 312386c57edfSAlan Stern goto retry_reset_resume; 312486c57edfSAlan Stern } 312554515fe5SAlan Stern } 3126b40b7a90SAlan Stern 3127624d6c07SAlan Stern if (status) { 3128624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 31291da177e4SLinus Torvalds status); 313007e72b95SOliver Neukum /* 313107e72b95SOliver Neukum * There are a few quirky devices which violate the standard 313207e72b95SOliver Neukum * by claiming to have remote wakeup enabled after a reset, 313307e72b95SOliver Neukum * which crash if the feature is cleared, hence check for 313407e72b95SOliver Neukum * udev->reset_resume 313507e72b95SOliver Neukum */ 313607e72b95SOliver Neukum } else if (udev->actconfig && !udev->reset_resume) { 313728e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) { 313854a3ac0cSLan Tianyu if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 313928e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 314054a3ac0cSLan Tianyu } else { 314154a3ac0cSLan Tianyu status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, 314254a3ac0cSLan Tianyu &devstatus); 314354a3ac0cSLan Tianyu if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP 314454a3ac0cSLan Tianyu | USB_INTRF_STAT_FUNC_RW)) 314528e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 314654a3ac0cSLan Tianyu } 314754a3ac0cSLan Tianyu 3148a8e7c565SAlan Stern if (status) 3149b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 3150b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 3151b9cef6c3SWu Fengguang status); 31521da177e4SLinus Torvalds status = 0; 31531da177e4SLinus Torvalds } 31541da177e4SLinus Torvalds return status; 31551da177e4SLinus Torvalds } 31561da177e4SLinus Torvalds 3157624d6c07SAlan Stern /* 3158624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 3159624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 3160624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 3161624d6c07SAlan Stern * 3162624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 3163624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 3164624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 3165624d6c07SAlan Stern * the host and the device is the same as it was when the device 3166624d6c07SAlan Stern * suspended. 3167624d6c07SAlan Stern * 3168feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 3169feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 317054515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 317154515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 317254515fe5SAlan Stern * 317354515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 317454515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 317554515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 317654515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 317754515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 317854515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 317954515fe5SAlan Stern * made to appear as if it had not disconnected. 318054515fe5SAlan Stern * 3181742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 3182feccc30dSAlan Stern * every effort to insure that the same device is present after the 318354515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 318454515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 318554515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 318654515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 318754515fe5SAlan Stern * new card is corrupted and the system crashes. 318854515fe5SAlan Stern * 3189624d6c07SAlan Stern * Returns 0 on success, else negative errno. 3190624d6c07SAlan Stern */ 319165bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 31921da177e4SLinus Torvalds { 3193ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3194ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3195624d6c07SAlan Stern int port1 = udev->portnum; 31961da177e4SLinus Torvalds int status; 3197d25450c6SAlan Stern u16 portchange, portstatus; 3198d25450c6SAlan Stern 3199ad493e5eSLan Tianyu if (port_dev->did_runtime_put) { 3200ad493e5eSLan Tianyu status = pm_runtime_get_sync(&port_dev->dev); 3201ad493e5eSLan Tianyu port_dev->did_runtime_put = false; 3202ad493e5eSLan Tianyu if (status < 0) { 3203ad493e5eSLan Tianyu dev_dbg(&udev->dev, "can't resume usb port, status %d\n", 3204ad493e5eSLan Tianyu status); 3205ad493e5eSLan Tianyu return status; 3206ad493e5eSLan Tianyu } 3207ad493e5eSLan Tianyu } 3208ad493e5eSLan Tianyu 3209d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 3210d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 32110ed9a57eSAndiry Xu if (status == 0 && !port_is_suspended(hub, portstatus)) 3212d25450c6SAlan Stern goto SuspendCleared; 32131da177e4SLinus Torvalds 32141da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 32151da177e4SLinus Torvalds 3216d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 3217d5cbad4bSAlan Stern 32181da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 3219a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3220c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); 3221a7114230SAndiry Xu else 3222ad493e5eSLan Tianyu status = usb_clear_port_feature(hub->hdev, 32231da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 32241da177e4SLinus Torvalds if (status) { 3225624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 32261da177e4SLinus Torvalds port1, status); 32271da177e4SLinus Torvalds } else { 32281da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 3229645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 32305b1b0b81SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : "")); 32311da177e4SLinus Torvalds msleep(25); 32321da177e4SLinus Torvalds 32331da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 32341da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 32351da177e4SLinus Torvalds * sequence. 32361da177e4SLinus Torvalds */ 3237d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 323854515fe5SAlan Stern 32391da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 32401da177e4SLinus Torvalds msleep(10); 32411da177e4SLinus Torvalds } 3242b01b03f3SAlan Stern 3243b01b03f3SAlan Stern SuspendCleared: 3244b01b03f3SAlan Stern if (status == 0) { 3245bfd1e910SAlan Stern udev->port_is_suspended = 0; 3246a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 3247a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 3248ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3249a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 3250a7114230SAndiry Xu } else { 3251b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 3252ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3253b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 32541da177e4SLinus Torvalds } 3255a7114230SAndiry Xu } 32561da177e4SLinus Torvalds 3257d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 3258d5cbad4bSAlan Stern 3259b01b03f3SAlan Stern status = check_port_resume_type(udev, 3260b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 326154515fe5SAlan Stern if (status == 0) 326254515fe5SAlan Stern status = finish_port_resume(udev); 326354515fe5SAlan Stern if (status < 0) { 326454515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 326554515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 326665580b43SAndiry Xu } else { 326765580b43SAndiry Xu /* Try to enable USB2 hardware LPM */ 326865580b43SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 326965580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 32708306095fSSarah Sharp 3271f74631e3SSarah Sharp /* Try to enable USB3 LTM and LPM */ 3272f74631e3SSarah Sharp usb_enable_ltm(udev); 32738306095fSSarah Sharp usb_unlocked_enable_lpm(udev); 327454515fe5SAlan Stern } 327565580b43SAndiry Xu 32761da177e4SLinus Torvalds return status; 32771da177e4SLinus Torvalds } 32781da177e4SLinus Torvalds 327984ebc102SAlan Stern #ifdef CONFIG_PM_RUNTIME 328084ebc102SAlan Stern 32818808f00cSAlan Stern /* caller has locked udev */ 32820534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 32831da177e4SLinus Torvalds { 32841da177e4SLinus Torvalds int status = 0; 32851da177e4SLinus Torvalds 32861da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 3287645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 32889bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 32899bbdf1e0SAlan Stern if (status == 0) { 32909bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 32919bbdf1e0SAlan Stern usb_autosuspend_device(udev); 32929bbdf1e0SAlan Stern } 3293d25450c6SAlan Stern } 32941da177e4SLinus Torvalds return status; 32951da177e4SLinus Torvalds } 32961da177e4SLinus Torvalds 3297d388dab7SAlan Stern #endif 3298d388dab7SAlan Stern 3299e6f30deaSMing Lei static int check_ports_changed(struct usb_hub *hub) 3300e6f30deaSMing Lei { 3301e6f30deaSMing Lei int port1; 3302e6f30deaSMing Lei 3303e6f30deaSMing Lei for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { 3304e6f30deaSMing Lei u16 portstatus, portchange; 3305e6f30deaSMing Lei int status; 3306e6f30deaSMing Lei 3307e6f30deaSMing Lei status = hub_port_status(hub, port1, &portstatus, &portchange); 3308e6f30deaSMing Lei if (!status && portchange) 3309e6f30deaSMing Lei return 1; 3310e6f30deaSMing Lei } 3311e6f30deaSMing Lei return 0; 3312e6f30deaSMing Lei } 3313e6f30deaSMing Lei 3314db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 33151da177e4SLinus Torvalds { 33161da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 33171da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 33181da177e4SLinus Torvalds unsigned port1; 33194296c70aSSarah Sharp int status; 33201da177e4SLinus Torvalds 3321e583d9dbSAlan Stern /* 3322e583d9dbSAlan Stern * Warn if children aren't already suspended. 3323e583d9dbSAlan Stern * Also, add up the number of wakeup-enabled descendants. 3324e583d9dbSAlan Stern */ 3325e583d9dbSAlan Stern hub->wakeup_enabled_descendants = 0; 33261da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 33271da177e4SLinus Torvalds struct usb_device *udev; 33281da177e4SLinus Torvalds 3329ff823c79SLan Tianyu udev = hub->ports[port1 - 1]->child; 33306840d255SAlan Stern if (udev && udev->can_submit) { 3331cbb33004SAlan Stern dev_warn(&intf->dev, "port %d nyet suspended\n", port1); 33325b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 3333c9f89fa4SDavid Brownell return -EBUSY; 3334c9f89fa4SDavid Brownell } 3335e583d9dbSAlan Stern if (udev) 3336e583d9dbSAlan Stern hub->wakeup_enabled_descendants += 3337e583d9dbSAlan Stern wakeup_enabled_descendants(udev); 33381da177e4SLinus Torvalds } 3339e6f30deaSMing Lei 3340e6f30deaSMing Lei if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { 3341e6f30deaSMing Lei /* check if there are changes pending on hub ports */ 3342e6f30deaSMing Lei if (check_ports_changed(hub)) { 3343e6f30deaSMing Lei if (PMSG_IS_AUTO(msg)) 3344e6f30deaSMing Lei return -EBUSY; 3345e6f30deaSMing Lei pm_wakeup_event(&hdev->dev, 2000); 3346e6f30deaSMing Lei } 3347e6f30deaSMing Lei } 3348e6f30deaSMing Lei 33494296c70aSSarah Sharp if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { 33504296c70aSSarah Sharp /* Enable hub to send remote wakeup for all ports. */ 33514296c70aSSarah Sharp for (port1 = 1; port1 <= hdev->maxchild; port1++) { 33524296c70aSSarah Sharp status = set_port_feature(hdev, 33534296c70aSSarah Sharp port1 | 33544296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_CONNECT | 33554296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | 33564296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, 33574296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_MASK); 33584296c70aSSarah Sharp } 33594296c70aSSarah Sharp } 33601da177e4SLinus Torvalds 3361441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 336240f122f3SAlan Stern 3363c9f89fa4SDavid Brownell /* stop khubd and related activity */ 33644330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 3365b6f6436dSAlan Stern return 0; 33661da177e4SLinus Torvalds } 33671da177e4SLinus Torvalds 33681da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 33691da177e4SLinus Torvalds { 33701da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 33711da177e4SLinus Torvalds 33725e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3373f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 33741da177e4SLinus Torvalds return 0; 33751da177e4SLinus Torvalds } 33761da177e4SLinus Torvalds 3377b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 3378f07600cfSAlan Stern { 3379b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 3380f07600cfSAlan Stern 33815e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3382f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 3383f07600cfSAlan Stern return 0; 3384f07600cfSAlan Stern } 3385f07600cfSAlan Stern 338654515fe5SAlan Stern /** 338754515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 338854515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 338954515fe5SAlan Stern * 339054515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 339154515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 3392feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 3393feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 3394feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 3395feccc30dSAlan Stern * the others will be disconnected. 339654515fe5SAlan Stern */ 339754515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 339854515fe5SAlan Stern { 339954515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 340054515fe5SAlan Stern rhdev->reset_resume = 1; 340154515fe5SAlan Stern } 340254515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 340354515fe5SAlan Stern 34041ea7e0e8SSarah Sharp static const char * const usb3_lpm_names[] = { 34051ea7e0e8SSarah Sharp "U0", 34061ea7e0e8SSarah Sharp "U1", 34071ea7e0e8SSarah Sharp "U2", 34081ea7e0e8SSarah Sharp "U3", 34091ea7e0e8SSarah Sharp }; 34101ea7e0e8SSarah Sharp 34111ea7e0e8SSarah Sharp /* 34121ea7e0e8SSarah Sharp * Send a Set SEL control transfer to the device, prior to enabling 34131ea7e0e8SSarah Sharp * device-initiated U1 or U2. This lets the device know the exit latencies from 34141ea7e0e8SSarah Sharp * the time the device initiates a U1 or U2 exit, to the time it will receive a 34151ea7e0e8SSarah Sharp * packet from the host. 34161ea7e0e8SSarah Sharp * 34171ea7e0e8SSarah Sharp * This function will fail if the SEL or PEL values for udev are greater than 34181ea7e0e8SSarah Sharp * the maximum allowed values for the link state to be enabled. 34191ea7e0e8SSarah Sharp */ 34201ea7e0e8SSarah Sharp static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) 34211ea7e0e8SSarah Sharp { 34221ea7e0e8SSarah Sharp struct usb_set_sel_req *sel_values; 34231ea7e0e8SSarah Sharp unsigned long long u1_sel; 34241ea7e0e8SSarah Sharp unsigned long long u1_pel; 34251ea7e0e8SSarah Sharp unsigned long long u2_sel; 34261ea7e0e8SSarah Sharp unsigned long long u2_pel; 34271ea7e0e8SSarah Sharp int ret; 34281ea7e0e8SSarah Sharp 34291ea7e0e8SSarah Sharp /* Convert SEL and PEL stored in ns to us */ 34301ea7e0e8SSarah Sharp u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); 34311ea7e0e8SSarah Sharp u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); 34321ea7e0e8SSarah Sharp u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); 34331ea7e0e8SSarah Sharp u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); 34341ea7e0e8SSarah Sharp 34351ea7e0e8SSarah Sharp /* 34361ea7e0e8SSarah Sharp * Make sure that the calculated SEL and PEL values for the link 34371ea7e0e8SSarah Sharp * state we're enabling aren't bigger than the max SEL/PEL 34381ea7e0e8SSarah Sharp * value that will fit in the SET SEL control transfer. 34391ea7e0e8SSarah Sharp * Otherwise the device would get an incorrect idea of the exit 34401ea7e0e8SSarah Sharp * latency for the link state, and could start a device-initiated 34411ea7e0e8SSarah Sharp * U1/U2 when the exit latencies are too high. 34421ea7e0e8SSarah Sharp */ 34431ea7e0e8SSarah Sharp if ((state == USB3_LPM_U1 && 34441ea7e0e8SSarah Sharp (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || 34451ea7e0e8SSarah Sharp u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || 34461ea7e0e8SSarah Sharp (state == USB3_LPM_U2 && 34471ea7e0e8SSarah Sharp (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || 34481ea7e0e8SSarah Sharp u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { 34491510a1a2SSarah Sharp dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", 34501ea7e0e8SSarah Sharp usb3_lpm_names[state], u1_sel, u1_pel); 34511ea7e0e8SSarah Sharp return -EINVAL; 34521ea7e0e8SSarah Sharp } 34531ea7e0e8SSarah Sharp 34541ea7e0e8SSarah Sharp /* 34551ea7e0e8SSarah Sharp * If we're enabling device-initiated LPM for one link state, 34561ea7e0e8SSarah Sharp * but the other link state has a too high SEL or PEL value, 34571ea7e0e8SSarah Sharp * just set those values to the max in the Set SEL request. 34581ea7e0e8SSarah Sharp */ 34591ea7e0e8SSarah Sharp if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) 34601ea7e0e8SSarah Sharp u1_sel = USB3_LPM_MAX_U1_SEL_PEL; 34611ea7e0e8SSarah Sharp 34621ea7e0e8SSarah Sharp if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) 34631ea7e0e8SSarah Sharp u1_pel = USB3_LPM_MAX_U1_SEL_PEL; 34641ea7e0e8SSarah Sharp 34651ea7e0e8SSarah Sharp if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) 34661ea7e0e8SSarah Sharp u2_sel = USB3_LPM_MAX_U2_SEL_PEL; 34671ea7e0e8SSarah Sharp 34681ea7e0e8SSarah Sharp if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) 34691ea7e0e8SSarah Sharp u2_pel = USB3_LPM_MAX_U2_SEL_PEL; 34701ea7e0e8SSarah Sharp 34711ea7e0e8SSarah Sharp /* 34721ea7e0e8SSarah Sharp * usb_enable_lpm() can be called as part of a failed device reset, 34731ea7e0e8SSarah Sharp * which may be initiated by an error path of a mass storage driver. 34741ea7e0e8SSarah Sharp * Therefore, use GFP_NOIO. 34751ea7e0e8SSarah Sharp */ 34761ea7e0e8SSarah Sharp sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); 34771ea7e0e8SSarah Sharp if (!sel_values) 34781ea7e0e8SSarah Sharp return -ENOMEM; 34791ea7e0e8SSarah Sharp 34801ea7e0e8SSarah Sharp sel_values->u1_sel = u1_sel; 34811ea7e0e8SSarah Sharp sel_values->u1_pel = u1_pel; 34821ea7e0e8SSarah Sharp sel_values->u2_sel = cpu_to_le16(u2_sel); 34831ea7e0e8SSarah Sharp sel_values->u2_pel = cpu_to_le16(u2_pel); 34841ea7e0e8SSarah Sharp 34851ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 34861ea7e0e8SSarah Sharp USB_REQ_SET_SEL, 34871ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 34881ea7e0e8SSarah Sharp 0, 0, 34891ea7e0e8SSarah Sharp sel_values, sizeof *(sel_values), 34901ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 34911ea7e0e8SSarah Sharp kfree(sel_values); 34921ea7e0e8SSarah Sharp return ret; 34931ea7e0e8SSarah Sharp } 34941ea7e0e8SSarah Sharp 34951ea7e0e8SSarah Sharp /* 34961ea7e0e8SSarah Sharp * Enable or disable device-initiated U1 or U2 transitions. 34971ea7e0e8SSarah Sharp */ 34981ea7e0e8SSarah Sharp static int usb_set_device_initiated_lpm(struct usb_device *udev, 34991ea7e0e8SSarah Sharp enum usb3_link_state state, bool enable) 35001ea7e0e8SSarah Sharp { 35011ea7e0e8SSarah Sharp int ret; 35021ea7e0e8SSarah Sharp int feature; 35031ea7e0e8SSarah Sharp 35041ea7e0e8SSarah Sharp switch (state) { 35051ea7e0e8SSarah Sharp case USB3_LPM_U1: 35061ea7e0e8SSarah Sharp feature = USB_DEVICE_U1_ENABLE; 35071ea7e0e8SSarah Sharp break; 35081ea7e0e8SSarah Sharp case USB3_LPM_U2: 35091ea7e0e8SSarah Sharp feature = USB_DEVICE_U2_ENABLE; 35101ea7e0e8SSarah Sharp break; 35111ea7e0e8SSarah Sharp default: 35121ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", 35131ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable"); 35141ea7e0e8SSarah Sharp return -EINVAL; 35151ea7e0e8SSarah Sharp } 35161ea7e0e8SSarah Sharp 35171ea7e0e8SSarah Sharp if (udev->state != USB_STATE_CONFIGURED) { 35181ea7e0e8SSarah Sharp dev_dbg(&udev->dev, "%s: Can't %s %s state " 35191ea7e0e8SSarah Sharp "for unconfigured device.\n", 35201ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable", 35211ea7e0e8SSarah Sharp usb3_lpm_names[state]); 35221ea7e0e8SSarah Sharp return 0; 35231ea7e0e8SSarah Sharp } 35241ea7e0e8SSarah Sharp 35251ea7e0e8SSarah Sharp if (enable) { 35261ea7e0e8SSarah Sharp /* 35271ea7e0e8SSarah Sharp * Now send the control transfer to enable device-initiated LPM 35281ea7e0e8SSarah Sharp * for either U1 or U2. 35291ea7e0e8SSarah Sharp */ 35301ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 35311ea7e0e8SSarah Sharp USB_REQ_SET_FEATURE, 35321ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 35331ea7e0e8SSarah Sharp feature, 35341ea7e0e8SSarah Sharp 0, NULL, 0, 35351ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 35361ea7e0e8SSarah Sharp } else { 35371ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 35381ea7e0e8SSarah Sharp USB_REQ_CLEAR_FEATURE, 35391ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 35401ea7e0e8SSarah Sharp feature, 35411ea7e0e8SSarah Sharp 0, NULL, 0, 35421ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 35431ea7e0e8SSarah Sharp } 35441ea7e0e8SSarah Sharp if (ret < 0) { 35451ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", 35461ea7e0e8SSarah Sharp enable ? "Enable" : "Disable", 35471ea7e0e8SSarah Sharp usb3_lpm_names[state]); 35481ea7e0e8SSarah Sharp return -EBUSY; 35491ea7e0e8SSarah Sharp } 35501ea7e0e8SSarah Sharp return 0; 35511ea7e0e8SSarah Sharp } 35521ea7e0e8SSarah Sharp 35531ea7e0e8SSarah Sharp static int usb_set_lpm_timeout(struct usb_device *udev, 35541ea7e0e8SSarah Sharp enum usb3_link_state state, int timeout) 35551ea7e0e8SSarah Sharp { 35561ea7e0e8SSarah Sharp int ret; 35571ea7e0e8SSarah Sharp int feature; 35581ea7e0e8SSarah Sharp 35591ea7e0e8SSarah Sharp switch (state) { 35601ea7e0e8SSarah Sharp case USB3_LPM_U1: 35611ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 35621ea7e0e8SSarah Sharp break; 35631ea7e0e8SSarah Sharp case USB3_LPM_U2: 35641ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 35651ea7e0e8SSarah Sharp break; 35661ea7e0e8SSarah Sharp default: 35671ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", 35681ea7e0e8SSarah Sharp __func__); 35691ea7e0e8SSarah Sharp return -EINVAL; 35701ea7e0e8SSarah Sharp } 35711ea7e0e8SSarah Sharp 35721ea7e0e8SSarah Sharp if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && 35731ea7e0e8SSarah Sharp timeout != USB3_LPM_DEVICE_INITIATED) { 35741ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " 35751ea7e0e8SSarah Sharp "which is a reserved value.\n", 35761ea7e0e8SSarah Sharp usb3_lpm_names[state], timeout); 35771ea7e0e8SSarah Sharp return -EINVAL; 35781ea7e0e8SSarah Sharp } 35791ea7e0e8SSarah Sharp 35801ea7e0e8SSarah Sharp ret = set_port_feature(udev->parent, 35811ea7e0e8SSarah Sharp USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, 35821ea7e0e8SSarah Sharp feature); 35831ea7e0e8SSarah Sharp if (ret < 0) { 35841ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," 35851ea7e0e8SSarah Sharp "error code %i\n", usb3_lpm_names[state], 35861ea7e0e8SSarah Sharp timeout, ret); 35871ea7e0e8SSarah Sharp return -EBUSY; 35881ea7e0e8SSarah Sharp } 35891ea7e0e8SSarah Sharp if (state == USB3_LPM_U1) 35901ea7e0e8SSarah Sharp udev->u1_params.timeout = timeout; 35911ea7e0e8SSarah Sharp else 35921ea7e0e8SSarah Sharp udev->u2_params.timeout = timeout; 35931ea7e0e8SSarah Sharp return 0; 35941ea7e0e8SSarah Sharp } 35951ea7e0e8SSarah Sharp 35961ea7e0e8SSarah Sharp /* 35971ea7e0e8SSarah Sharp * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated 35981ea7e0e8SSarah Sharp * U1/U2 entry. 35991ea7e0e8SSarah Sharp * 36001ea7e0e8SSarah Sharp * We will attempt to enable U1 or U2, but there are no guarantees that the 36011ea7e0e8SSarah Sharp * control transfers to set the hub timeout or enable device-initiated U1/U2 36021ea7e0e8SSarah Sharp * will be successful. 36031ea7e0e8SSarah Sharp * 36041ea7e0e8SSarah Sharp * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI 36051ea7e0e8SSarah Sharp * driver know about it. If that call fails, it should be harmless, and just 36061ea7e0e8SSarah Sharp * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. 36071ea7e0e8SSarah Sharp */ 36081ea7e0e8SSarah Sharp static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 36091ea7e0e8SSarah Sharp enum usb3_link_state state) 36101ea7e0e8SSarah Sharp { 361165a95b75SSarah Sharp int timeout, ret; 3612ae8963adSSarah Sharp __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; 3613ae8963adSSarah Sharp __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; 3614ae8963adSSarah Sharp 3615ae8963adSSarah Sharp /* If the device says it doesn't have *any* exit latency to come out of 3616ae8963adSSarah Sharp * U1 or U2, it's probably lying. Assume it doesn't implement that link 3617ae8963adSSarah Sharp * state. 3618ae8963adSSarah Sharp */ 3619ae8963adSSarah Sharp if ((state == USB3_LPM_U1 && u1_mel == 0) || 3620ae8963adSSarah Sharp (state == USB3_LPM_U2 && u2_mel == 0)) 3621ae8963adSSarah Sharp return; 36221ea7e0e8SSarah Sharp 362365a95b75SSarah Sharp /* 362465a95b75SSarah Sharp * First, let the device know about the exit latencies 362565a95b75SSarah Sharp * associated with the link state we're about to enable. 362665a95b75SSarah Sharp */ 362765a95b75SSarah Sharp ret = usb_req_set_sel(udev, state); 362865a95b75SSarah Sharp if (ret < 0) { 362965a95b75SSarah Sharp dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", 363065a95b75SSarah Sharp usb3_lpm_names[state]); 363165a95b75SSarah Sharp return; 363265a95b75SSarah Sharp } 363365a95b75SSarah Sharp 36341ea7e0e8SSarah Sharp /* We allow the host controller to set the U1/U2 timeout internally 36351ea7e0e8SSarah Sharp * first, so that it can change its schedule to account for the 36361ea7e0e8SSarah Sharp * additional latency to send data to a device in a lower power 36371ea7e0e8SSarah Sharp * link state. 36381ea7e0e8SSarah Sharp */ 36391ea7e0e8SSarah Sharp timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); 36401ea7e0e8SSarah Sharp 36411ea7e0e8SSarah Sharp /* xHCI host controller doesn't want to enable this LPM state. */ 36421ea7e0e8SSarah Sharp if (timeout == 0) 36431ea7e0e8SSarah Sharp return; 36441ea7e0e8SSarah Sharp 36451ea7e0e8SSarah Sharp if (timeout < 0) { 36461ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not enable %s link state, " 36471ea7e0e8SSarah Sharp "xHCI error %i.\n", usb3_lpm_names[state], 36481ea7e0e8SSarah Sharp timeout); 36491ea7e0e8SSarah Sharp return; 36501ea7e0e8SSarah Sharp } 36511ea7e0e8SSarah Sharp 36521ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, timeout)) 36531ea7e0e8SSarah Sharp /* If we can't set the parent hub U1/U2 timeout, 36541ea7e0e8SSarah Sharp * device-initiated LPM won't be allowed either, so let the xHCI 36551ea7e0e8SSarah Sharp * host know that this link state won't be enabled. 36561ea7e0e8SSarah Sharp */ 36571ea7e0e8SSarah Sharp hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); 36581ea7e0e8SSarah Sharp 36591ea7e0e8SSarah Sharp /* Only a configured device will accept the Set Feature U1/U2_ENABLE */ 36601ea7e0e8SSarah Sharp else if (udev->actconfig) 36611ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, true); 36621ea7e0e8SSarah Sharp 36631ea7e0e8SSarah Sharp } 36641ea7e0e8SSarah Sharp 36651ea7e0e8SSarah Sharp /* 36661ea7e0e8SSarah Sharp * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated 36671ea7e0e8SSarah Sharp * U1/U2 entry. 36681ea7e0e8SSarah Sharp * 36691ea7e0e8SSarah Sharp * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. 36701ea7e0e8SSarah Sharp * If zero is returned, the parent will not allow the link to go into U1/U2. 36711ea7e0e8SSarah Sharp * 36721ea7e0e8SSarah Sharp * If zero is returned, device-initiated U1/U2 entry may still be enabled, but 36731ea7e0e8SSarah Sharp * it won't have an effect on the bus link state because the parent hub will 36741ea7e0e8SSarah Sharp * still disallow device-initiated U1/U2 entry. 36751ea7e0e8SSarah Sharp * 36761ea7e0e8SSarah Sharp * If zero is returned, the xHCI host controller may still think U1/U2 entry is 36771ea7e0e8SSarah Sharp * possible. The result will be slightly more bus bandwidth will be taken up 36781ea7e0e8SSarah Sharp * (to account for U1/U2 exit latency), but it should be harmless. 36791ea7e0e8SSarah Sharp */ 36801ea7e0e8SSarah Sharp static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 36811ea7e0e8SSarah Sharp enum usb3_link_state state) 36821ea7e0e8SSarah Sharp { 36831ea7e0e8SSarah Sharp int feature; 36841ea7e0e8SSarah Sharp 36851ea7e0e8SSarah Sharp switch (state) { 36861ea7e0e8SSarah Sharp case USB3_LPM_U1: 36871ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 36881ea7e0e8SSarah Sharp break; 36891ea7e0e8SSarah Sharp case USB3_LPM_U2: 36901ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 36911ea7e0e8SSarah Sharp break; 36921ea7e0e8SSarah Sharp default: 36931ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", 36941ea7e0e8SSarah Sharp __func__); 36951ea7e0e8SSarah Sharp return -EINVAL; 36961ea7e0e8SSarah Sharp } 36971ea7e0e8SSarah Sharp 36981ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, 0)) 36991ea7e0e8SSarah Sharp return -EBUSY; 37001ea7e0e8SSarah Sharp 37011ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, false); 37021ea7e0e8SSarah Sharp 37031ea7e0e8SSarah Sharp if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) 37041ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " 37051ea7e0e8SSarah Sharp "bus schedule bandwidth may be impacted.\n", 37061ea7e0e8SSarah Sharp usb3_lpm_names[state]); 37071ea7e0e8SSarah Sharp return 0; 37081ea7e0e8SSarah Sharp } 37091ea7e0e8SSarah Sharp 37101ea7e0e8SSarah Sharp /* 37111ea7e0e8SSarah Sharp * Disable hub-initiated and device-initiated U1 and U2 entry. 37121ea7e0e8SSarah Sharp * Caller must own the bandwidth_mutex. 37131ea7e0e8SSarah Sharp * 37141ea7e0e8SSarah Sharp * This will call usb_enable_lpm() on failure, which will decrement 37151ea7e0e8SSarah Sharp * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. 37161ea7e0e8SSarah Sharp */ 37171ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 37181ea7e0e8SSarah Sharp { 37191ea7e0e8SSarah Sharp struct usb_hcd *hcd; 37201ea7e0e8SSarah Sharp 37211ea7e0e8SSarah Sharp if (!udev || !udev->parent || 37221ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 37231ea7e0e8SSarah Sharp !udev->lpm_capable) 37241ea7e0e8SSarah Sharp return 0; 37251ea7e0e8SSarah Sharp 37261ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 37271ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) 37281ea7e0e8SSarah Sharp return 0; 37291ea7e0e8SSarah Sharp 37301ea7e0e8SSarah Sharp udev->lpm_disable_count++; 373155558c33SDan Carpenter if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) 37321ea7e0e8SSarah Sharp return 0; 37331ea7e0e8SSarah Sharp 37341ea7e0e8SSarah Sharp /* If LPM is enabled, attempt to disable it. */ 37351ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) 37361ea7e0e8SSarah Sharp goto enable_lpm; 37371ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) 37381ea7e0e8SSarah Sharp goto enable_lpm; 37391ea7e0e8SSarah Sharp 37401ea7e0e8SSarah Sharp return 0; 37411ea7e0e8SSarah Sharp 37421ea7e0e8SSarah Sharp enable_lpm: 37431ea7e0e8SSarah Sharp usb_enable_lpm(udev); 37441ea7e0e8SSarah Sharp return -EBUSY; 37451ea7e0e8SSarah Sharp } 37461ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 37471ea7e0e8SSarah Sharp 37481ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ 37491ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 37501ea7e0e8SSarah Sharp { 37511ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 37521ea7e0e8SSarah Sharp int ret; 37531ea7e0e8SSarah Sharp 37541ea7e0e8SSarah Sharp if (!hcd) 37551ea7e0e8SSarah Sharp return -EINVAL; 37561ea7e0e8SSarah Sharp 37571ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 37581ea7e0e8SSarah Sharp ret = usb_disable_lpm(udev); 37591ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 37601ea7e0e8SSarah Sharp 37611ea7e0e8SSarah Sharp return ret; 37621ea7e0e8SSarah Sharp } 37631ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 37641ea7e0e8SSarah Sharp 37651ea7e0e8SSarah Sharp /* 37661ea7e0e8SSarah Sharp * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The 37671ea7e0e8SSarah Sharp * xHCI host policy may prevent U1 or U2 from being enabled. 37681ea7e0e8SSarah Sharp * 37691ea7e0e8SSarah Sharp * Other callers may have disabled link PM, so U1 and U2 entry will be disabled 37701ea7e0e8SSarah Sharp * until the lpm_disable_count drops to zero. Caller must own the 37711ea7e0e8SSarah Sharp * bandwidth_mutex. 37721ea7e0e8SSarah Sharp */ 37731ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) 37741ea7e0e8SSarah Sharp { 37751ea7e0e8SSarah Sharp struct usb_hcd *hcd; 37761ea7e0e8SSarah Sharp 37771ea7e0e8SSarah Sharp if (!udev || !udev->parent || 37781ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 37791ea7e0e8SSarah Sharp !udev->lpm_capable) 37801ea7e0e8SSarah Sharp return; 37811ea7e0e8SSarah Sharp 37821ea7e0e8SSarah Sharp udev->lpm_disable_count--; 37831ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 37841ea7e0e8SSarah Sharp /* Double check that we can both enable and disable LPM. 37851ea7e0e8SSarah Sharp * Device must be configured to accept set feature U1/U2 timeout. 37861ea7e0e8SSarah Sharp */ 37871ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || 37881ea7e0e8SSarah Sharp !hcd->driver->disable_usb3_lpm_timeout) 37891ea7e0e8SSarah Sharp return; 37901ea7e0e8SSarah Sharp 37911ea7e0e8SSarah Sharp if (udev->lpm_disable_count > 0) 37921ea7e0e8SSarah Sharp return; 37931ea7e0e8SSarah Sharp 37941ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U1); 37951ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U2); 37961ea7e0e8SSarah Sharp } 37971ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 37981ea7e0e8SSarah Sharp 37991ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ 38001ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) 38011ea7e0e8SSarah Sharp { 38021ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 38031ea7e0e8SSarah Sharp 38041ea7e0e8SSarah Sharp if (!hcd) 38051ea7e0e8SSarah Sharp return; 38061ea7e0e8SSarah Sharp 38071ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 38081ea7e0e8SSarah Sharp usb_enable_lpm(udev); 38091ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 38101ea7e0e8SSarah Sharp } 38111ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 38121ea7e0e8SSarah Sharp 38131ea7e0e8SSarah Sharp 3814d388dab7SAlan Stern #else /* CONFIG_PM */ 3815d388dab7SAlan Stern 3816511366daSAndrew Morton #define hub_suspend NULL 3817511366daSAndrew Morton #define hub_resume NULL 3818f07600cfSAlan Stern #define hub_reset_resume NULL 38191ea7e0e8SSarah Sharp 38201ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 38211ea7e0e8SSarah Sharp { 38221ea7e0e8SSarah Sharp return 0; 38231ea7e0e8SSarah Sharp } 3824e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 38251ea7e0e8SSarah Sharp 38261ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) { } 3827e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 38281ea7e0e8SSarah Sharp 38291ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 38301ea7e0e8SSarah Sharp { 38311ea7e0e8SSarah Sharp return 0; 38321ea7e0e8SSarah Sharp } 3833e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 38341ea7e0e8SSarah Sharp 38351ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) { } 3836e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 3837f74631e3SSarah Sharp 3838f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 3839f74631e3SSarah Sharp { 3840f74631e3SSarah Sharp return 0; 3841f74631e3SSarah Sharp } 3842f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 3843f74631e3SSarah Sharp 3844f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) { } 3845f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 3846c4b51a43SAlan Stern 3847c4b51a43SAlan Stern #endif /* CONFIG_PM */ 3848d388dab7SAlan Stern 38491da177e4SLinus Torvalds 38501da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 38511da177e4SLinus Torvalds * 38521da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 38531da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 38541da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 38551da177e4SLinus Torvalds * 38561da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 38571da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 38581da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 38591da177e4SLinus Torvalds * 38601da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 38611da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 38621da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 38631da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 38641da177e4SLinus Torvalds */ 3865ad493e5eSLan Tianyu int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) 38661da177e4SLinus Torvalds { 38671da177e4SLinus Torvalds int ret; 38681da177e4SLinus Torvalds int total_time, stable_time = 0; 38691da177e4SLinus Torvalds u16 portchange, portstatus; 38701da177e4SLinus Torvalds unsigned connection = 0xffff; 38711da177e4SLinus Torvalds 38721da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 38731da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 38741da177e4SLinus Torvalds if (ret < 0) 38751da177e4SLinus Torvalds return ret; 38761da177e4SLinus Torvalds 38771da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 38781da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 3879ad493e5eSLan Tianyu if (!must_be_connected || 3880ad493e5eSLan Tianyu (connection == USB_PORT_STAT_CONNECTION)) 38811da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 38821da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 38831da177e4SLinus Torvalds break; 38841da177e4SLinus Torvalds } else { 38851da177e4SLinus Torvalds stable_time = 0; 38861da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 38871da177e4SLinus Torvalds } 38881da177e4SLinus Torvalds 38891da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 3890ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 38911da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 38921da177e4SLinus Torvalds } 38931da177e4SLinus Torvalds 38941da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 38951da177e4SLinus Torvalds break; 38961da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 38971da177e4SLinus Torvalds } 38981da177e4SLinus Torvalds 38991da177e4SLinus Torvalds dev_dbg (hub->intfdev, 39001da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 39011da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 39021da177e4SLinus Torvalds 39031da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 39041da177e4SLinus Torvalds return -ETIMEDOUT; 39051da177e4SLinus Torvalds return portstatus; 39061da177e4SLinus Torvalds } 39071da177e4SLinus Torvalds 3908fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 39091da177e4SLinus Torvalds { 3910ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 3911ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 39122caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 39131da177e4SLinus Torvalds } 3914fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 39151da177e4SLinus Torvalds 39161da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 39171da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 39181da177e4SLinus Torvalds 39194326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 39201da177e4SLinus Torvalds { 39211da177e4SLinus Torvalds int retval; 3922c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 39231da177e4SLinus Torvalds 3924c6515272SSarah Sharp /* 3925c6515272SSarah Sharp * The host controller will choose the device address, 3926c6515272SSarah Sharp * instead of the core having chosen it earlier 3927c6515272SSarah Sharp */ 3928c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 39291da177e4SLinus Torvalds return -EINVAL; 39301da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 39311da177e4SLinus Torvalds return 0; 39321da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 39331da177e4SLinus Torvalds return -EINVAL; 3934c8d4af8eSAndiry Xu if (hcd->driver->address_device) 3935c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 3936c8d4af8eSAndiry Xu else 39371da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 39384326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 39391da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 39401da177e4SLinus Torvalds if (retval == 0) { 39413b29b68bSAlan Stern update_devnum(udev, devnum); 39424953d141SDavid Vrabel /* Device now using proper address. */ 39431da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 3944fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 39451da177e4SLinus Torvalds } 39461da177e4SLinus Torvalds return retval; 39471da177e4SLinus Torvalds } 39481da177e4SLinus Torvalds 39491da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 39501da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 39511da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 39521da177e4SLinus Torvalds * 39531da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 3954742120c6SMing Lei * usb_reset_and_verify_device), the caller must own the device lock. For a 39551da177e4SLinus Torvalds * newly detected device that is not accessible through any global 39561da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 39571da177e4SLinus Torvalds */ 39581da177e4SLinus Torvalds static int 39591da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 39601da177e4SLinus Torvalds int retry_counter) 39611da177e4SLinus Torvalds { 39624186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 39631da177e4SLinus Torvalds 39641da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 3965e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 39661da177e4SLinus Torvalds int i, j, retval; 39671da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 39681da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 3969e538dfdaSMichal Nazarewicz const char *speed; 39704326ed0bSAlan Stern int devnum = udev->devnum; 39711da177e4SLinus Torvalds 39721da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 39731da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 39741da177e4SLinus Torvalds */ 39751da177e4SLinus Torvalds if (!hdev->parent) { 39761da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 39771da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 39781da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 39791da177e4SLinus Torvalds } 39801da177e4SLinus Torvalds 39811da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 39821da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 39831da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 39841da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 39851da177e4SLinus Torvalds 39864186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 39871da177e4SLinus Torvalds 39881da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 3989e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 399075d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 39911da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 39921da177e4SLinus Torvalds goto fail; 39931da177e4SLinus Torvalds /* success, speed is known */ 399407194ab7SLuben Tuikov 39951da177e4SLinus Torvalds retval = -ENODEV; 39961da177e4SLinus Torvalds 39971da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 39981da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 39991da177e4SLinus Torvalds goto fail; 40001da177e4SLinus Torvalds } 40011da177e4SLinus Torvalds oldspeed = udev->speed; 40021da177e4SLinus Torvalds 40031da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 40041da177e4SLinus Torvalds * it's fixed size except for full speed devices. 40055bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 40065bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 40071da177e4SLinus Torvalds */ 40081da177e4SLinus Torvalds switch (udev->speed) { 40096b403b02SSarah Sharp case USB_SPEED_SUPER: 4010551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 4011551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 40125bb6e0aeSInaky Perez-Gonzalez break; 40131da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 4014551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 40151da177e4SLinus Torvalds break; 40161da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 40171da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 40181da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 40191da177e4SLinus Torvalds * then correct our initial guess. 40201da177e4SLinus Torvalds */ 4021551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 40221da177e4SLinus Torvalds break; 40231da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 4024551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 40251da177e4SLinus Torvalds break; 40261da177e4SLinus Torvalds default: 40271da177e4SLinus Torvalds goto fail; 40281da177e4SLinus Torvalds } 40291da177e4SLinus Torvalds 4030e538dfdaSMichal Nazarewicz if (udev->speed == USB_SPEED_WIRELESS) 4031e538dfdaSMichal Nazarewicz speed = "variable speed Wireless"; 4032e538dfdaSMichal Nazarewicz else 4033e538dfdaSMichal Nazarewicz speed = usb_speed_string(udev->speed); 4034e538dfdaSMichal Nazarewicz 4035c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 403683a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 4037e538dfdaSMichal Nazarewicz "%s %s USB device number %d using %s\n", 4038e538dfdaSMichal Nazarewicz (udev->config) ? "reset" : "new", speed, 40393b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 40401da177e4SLinus Torvalds 40411da177e4SLinus Torvalds /* Set up TT records, if needed */ 40421da177e4SLinus Torvalds if (hdev->tt) { 40431da177e4SLinus Torvalds udev->tt = hdev->tt; 40441da177e4SLinus Torvalds udev->ttport = hdev->ttport; 40451da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 40461da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 4047d199c96dSAlan Stern if (!hub->tt.hub) { 4048d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 4049d199c96dSAlan Stern retval = -EINVAL; 4050d199c96dSAlan Stern goto fail; 4051d199c96dSAlan Stern } 40521da177e4SLinus Torvalds udev->tt = &hub->tt; 40531da177e4SLinus Torvalds udev->ttport = port1; 40541da177e4SLinus Torvalds } 40551da177e4SLinus Torvalds 40561da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 40571da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 40581da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 40591da177e4SLinus Torvalds * Change it cautiously. 40601da177e4SLinus Torvalds * 40611da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 40621da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 40631da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 40641da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 40651da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 40661da177e4SLinus Torvalds * value. 40671da177e4SLinus Torvalds */ 40681da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 4069c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { 40701da177e4SLinus Torvalds struct usb_device_descriptor *buf; 40711da177e4SLinus Torvalds int r = 0; 40721da177e4SLinus Torvalds 40731da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 40741da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 40751da177e4SLinus Torvalds if (!buf) { 40761da177e4SLinus Torvalds retval = -ENOMEM; 40771da177e4SLinus Torvalds continue; 40781da177e4SLinus Torvalds } 40791da177e4SLinus Torvalds 4080b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 4081b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 4082b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 40831da177e4SLinus Torvalds */ 40841da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 40851da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 40861da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 40871da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 40881da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 40891da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 4090fd7c519dSJaroslav Kysela initial_descriptor_timeout); 40911da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 40925bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 40931da177e4SLinus Torvalds if (buf->bDescriptorType == 40941da177e4SLinus Torvalds USB_DT_DEVICE) { 40951da177e4SLinus Torvalds r = 0; 40961da177e4SLinus Torvalds break; 40971da177e4SLinus Torvalds } 40981da177e4SLinus Torvalds /* FALL THROUGH */ 40991da177e4SLinus Torvalds default: 41001da177e4SLinus Torvalds if (r == 0) 41011da177e4SLinus Torvalds r = -EPROTO; 41021da177e4SLinus Torvalds break; 41031da177e4SLinus Torvalds } 41041da177e4SLinus Torvalds if (r == 0) 41051da177e4SLinus Torvalds break; 41061da177e4SLinus Torvalds } 41071da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 41081da177e4SLinus Torvalds buf->bMaxPacketSize0; 41091da177e4SLinus Torvalds kfree(buf); 41101da177e4SLinus Torvalds 411175d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 41121da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 41131da177e4SLinus Torvalds goto fail; 41141da177e4SLinus Torvalds if (oldspeed != udev->speed) { 41151da177e4SLinus Torvalds dev_dbg(&udev->dev, 41161da177e4SLinus Torvalds "device reset changed speed!\n"); 41171da177e4SLinus Torvalds retval = -ENODEV; 41181da177e4SLinus Torvalds goto fail; 41191da177e4SLinus Torvalds } 41201da177e4SLinus Torvalds if (r) { 4121e9e88fb7SAlan Stern if (r != -ENODEV) 4122e9e88fb7SAlan Stern dev_err(&udev->dev, "device descriptor read/64, error %d\n", 4123b9cef6c3SWu Fengguang r); 41241da177e4SLinus Torvalds retval = -EMSGSIZE; 41251da177e4SLinus Torvalds continue; 41261da177e4SLinus Torvalds } 41271da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 41281da177e4SLinus Torvalds } 41291da177e4SLinus Torvalds 41306c529cdcSInaky Perez-Gonzalez /* 41316c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 41326c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 41336c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 41346c529cdcSInaky Perez-Gonzalez */ 41356c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 41361da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 41374326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 41381da177e4SLinus Torvalds if (retval >= 0) 41391da177e4SLinus Torvalds break; 41401da177e4SLinus Torvalds msleep(200); 41411da177e4SLinus Torvalds } 41421da177e4SLinus Torvalds if (retval < 0) { 4143e9e88fb7SAlan Stern if (retval != -ENODEV) 4144e9e88fb7SAlan Stern dev_err(&udev->dev, "device not accepting address %d, error %d\n", 41454326ed0bSAlan Stern devnum, retval); 41461da177e4SLinus Torvalds goto fail; 41471da177e4SLinus Torvalds } 4148c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 4149c6515272SSarah Sharp devnum = udev->devnum; 4150c6515272SSarah Sharp dev_info(&udev->dev, 41513b29b68bSAlan Stern "%s SuperSpeed USB device number %d using %s\n", 4152c6515272SSarah Sharp (udev->config) ? "reset" : "new", 41533b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 4154c6515272SSarah Sharp } 41551da177e4SLinus Torvalds 41561da177e4SLinus Torvalds /* cope with hardware quirkiness: 41571da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 41581da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 41591da177e4SLinus Torvalds */ 41601da177e4SLinus Torvalds msleep(10); 4161c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) 41621da177e4SLinus Torvalds break; 41636c529cdcSInaky Perez-Gonzalez } 41641da177e4SLinus Torvalds 41651da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 41661da177e4SLinus Torvalds if (retval < 8) { 4167e9e88fb7SAlan Stern if (retval != -ENODEV) 4168b9cef6c3SWu Fengguang dev_err(&udev->dev, 4169b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 4170b9cef6c3SWu Fengguang retval); 41711da177e4SLinus Torvalds if (retval >= 0) 41721da177e4SLinus Torvalds retval = -EMSGSIZE; 41731da177e4SLinus Torvalds } else { 41741da177e4SLinus Torvalds retval = 0; 41751da177e4SLinus Torvalds break; 41761da177e4SLinus Torvalds } 41771da177e4SLinus Torvalds } 41781da177e4SLinus Torvalds if (retval) 41791da177e4SLinus Torvalds goto fail; 41801da177e4SLinus Torvalds 4181b76baa81SPeter Chen if (hcd->phy && !hdev->parent) 4182ac96511bSPeter Chen usb_phy_notify_connect(hcd->phy, udev->speed); 4183b76baa81SPeter Chen 4184d8aec3dbSElric Fu /* 4185d8aec3dbSElric Fu * Some superspeed devices have finished the link training process 4186d8aec3dbSElric Fu * and attached to a superspeed hub port, but the device descriptor 4187d8aec3dbSElric Fu * got from those devices show they aren't superspeed devices. Warm 4188d8aec3dbSElric Fu * reset the port attached by the devices can fix them. 4189d8aec3dbSElric Fu */ 4190d8aec3dbSElric Fu if ((udev->speed == USB_SPEED_SUPER) && 4191d8aec3dbSElric Fu (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { 4192d8aec3dbSElric Fu dev_err(&udev->dev, "got a wrong device descriptor, " 4193d8aec3dbSElric Fu "warm reset device\n"); 4194d8aec3dbSElric Fu hub_port_reset(hub, port1, udev, 4195d8aec3dbSElric Fu HUB_BH_RESET_TIME, true); 4196d8aec3dbSElric Fu retval = -EINVAL; 4197d8aec3dbSElric Fu goto fail; 4198d8aec3dbSElric Fu } 4199d8aec3dbSElric Fu 42006b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 42016b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 42026b403b02SSarah Sharp i = 512; 42036b403b02SSarah Sharp else 42046b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 420529cc8897SKuninori Morimoto if (usb_endpoint_maxp(&udev->ep0.desc) != i) { 420656626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 42071da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 420856626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 42091da177e4SLinus Torvalds retval = -EMSGSIZE; 42101da177e4SLinus Torvalds goto fail; 42111da177e4SLinus Torvalds } 421256626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 42131da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 421456626a72SAlan Stern else 421556626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 42161da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 4217fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 42181da177e4SLinus Torvalds } 42191da177e4SLinus Torvalds 42201da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 42211da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 4222e9e88fb7SAlan Stern if (retval != -ENODEV) 4223b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 4224b9cef6c3SWu Fengguang retval); 42251da177e4SLinus Torvalds if (retval >= 0) 42261da177e4SLinus Torvalds retval = -ENOMSG; 42271da177e4SLinus Torvalds goto fail; 42281da177e4SLinus Torvalds } 42291da177e4SLinus Torvalds 42301ff4df56SAndiry Xu if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { 42311ff4df56SAndiry Xu retval = usb_get_bos_descriptor(udev); 423251e0a012SSarah Sharp if (!retval) { 4233d9b2099cSSarah Sharp udev->lpm_capable = usb_device_supports_lpm(udev); 423451e0a012SSarah Sharp usb_set_lpm_parameters(udev); 423551e0a012SSarah Sharp } 42361ff4df56SAndiry Xu } 42373148bf04SAndiry Xu 42381da177e4SLinus Torvalds retval = 0; 423948f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 424048f24970SAlek Du if (hcd->driver->update_device) 424148f24970SAlek Du hcd->driver->update_device(hcd, udev); 42421da177e4SLinus Torvalds fail: 42434326ed0bSAlan Stern if (retval) { 42441da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 42453b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 42464326ed0bSAlan Stern } 42474186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 42481da177e4SLinus Torvalds return retval; 42491da177e4SLinus Torvalds } 42501da177e4SLinus Torvalds 42511da177e4SLinus Torvalds static void 42521da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 42531da177e4SLinus Torvalds { 42541da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 42551da177e4SLinus Torvalds int status; 42561da177e4SLinus Torvalds 4257e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 42581da177e4SLinus Torvalds if (qual == NULL) 42591da177e4SLinus Torvalds return; 42601da177e4SLinus Torvalds 42611da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 42621da177e4SLinus Torvalds qual, sizeof *qual); 42631da177e4SLinus Torvalds if (status == sizeof *qual) { 42641da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 42651da177e4SLinus Torvalds "connect to a high speed hub\n"); 42661da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 42671da177e4SLinus Torvalds if (hub->has_indicators) { 42681da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 4269c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 42701da177e4SLinus Torvalds } 42711da177e4SLinus Torvalds } 42721da177e4SLinus Torvalds kfree(qual); 42731da177e4SLinus Torvalds } 42741da177e4SLinus Torvalds 42751da177e4SLinus Torvalds static unsigned 42761da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 42771da177e4SLinus Torvalds { 42781da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 42791da177e4SLinus Torvalds int remaining; 428055c52718SAlan Stern int port1; 42811da177e4SLinus Torvalds 428255c52718SAlan Stern if (!hub->limited_power) 42831da177e4SLinus Torvalds return 0; 42841da177e4SLinus Torvalds 428555c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 428655c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 4287ff823c79SLan Tianyu struct usb_device *udev = hub->ports[port1 - 1]->child; 428855c52718SAlan Stern int delta; 4289430ee58eSSebastian Andrzej Siewior unsigned unit_load; 42901da177e4SLinus Torvalds 42911da177e4SLinus Torvalds if (!udev) 42921da177e4SLinus Torvalds continue; 4293430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(udev)) 4294430ee58eSSebastian Andrzej Siewior unit_load = 150; 4295430ee58eSSebastian Andrzej Siewior else 4296430ee58eSSebastian Andrzej Siewior unit_load = 100; 42971da177e4SLinus Torvalds 4298430ee58eSSebastian Andrzej Siewior /* 4299430ee58eSSebastian Andrzej Siewior * Unconfigured devices may not use more than one unit load, 4300430ee58eSSebastian Andrzej Siewior * or 8mA for OTG ports 4301430ee58eSSebastian Andrzej Siewior */ 43021da177e4SLinus Torvalds if (udev->actconfig) 43038d8479dbSSebastian Andrzej Siewior delta = usb_get_max_power(udev, udev->actconfig); 430455c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 4305430ee58eSSebastian Andrzej Siewior delta = unit_load; 43061da177e4SLinus Torvalds else 430755c52718SAlan Stern delta = 8; 430855c52718SAlan Stern if (delta > hub->mA_per_port) 4309b9cef6c3SWu Fengguang dev_warn(&udev->dev, 4310b9cef6c3SWu Fengguang "%dmA is over %umA budget for port %d!\n", 431155c52718SAlan Stern delta, hub->mA_per_port, port1); 43121da177e4SLinus Torvalds remaining -= delta; 43131da177e4SLinus Torvalds } 43141da177e4SLinus Torvalds if (remaining < 0) { 431555c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 431655c52718SAlan Stern - remaining); 43171da177e4SLinus Torvalds remaining = 0; 43181da177e4SLinus Torvalds } 43191da177e4SLinus Torvalds return remaining; 43201da177e4SLinus Torvalds } 43211da177e4SLinus Torvalds 43221da177e4SLinus Torvalds /* Handle physical or logical connection change events. 43231da177e4SLinus Torvalds * This routine is called when: 43241da177e4SLinus Torvalds * a port connection-change occurs; 43251da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 4326742120c6SMing Lei * usb_reset_and_verify_device() encounters changed descriptors (as from 43271da177e4SLinus Torvalds * a firmware download) 43281da177e4SLinus Torvalds * caller already locked the hub 43291da177e4SLinus Torvalds */ 43301da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 43311da177e4SLinus Torvalds u16 portstatus, u16 portchange) 43321da177e4SLinus Torvalds { 43331da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 43341da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 433590da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 433624618b0cSAlan Stern unsigned wHubCharacteristics = 433724618b0cSAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 43388808f00cSAlan Stern struct usb_device *udev; 43391da177e4SLinus Torvalds int status, i; 4340430ee58eSSebastian Andrzej Siewior unsigned unit_load; 43411da177e4SLinus Torvalds 43421da177e4SLinus Torvalds dev_dbg (hub_dev, 43431da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 4344131dec34SSarah Sharp port1, portstatus, portchange, portspeed(hub, portstatus)); 43451da177e4SLinus Torvalds 43461da177e4SLinus Torvalds if (hub->has_indicators) { 43471da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 43481da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 43491da177e4SLinus Torvalds } 43501da177e4SLinus Torvalds 43511da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 43521da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 43531da177e4SLinus Torvalds if (hdev->bus->is_b_host) 435424618b0cSAlan Stern portchange &= ~(USB_PORT_STAT_C_CONNECTION | 435524618b0cSAlan Stern USB_PORT_STAT_C_ENABLE); 43561da177e4SLinus Torvalds #endif 43571da177e4SLinus Torvalds 43588808f00cSAlan Stern /* Try to resuscitate an existing device */ 4359ff823c79SLan Tianyu udev = hub->ports[port1 - 1]->child; 43608808f00cSAlan Stern if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 43618808f00cSAlan Stern udev->state != USB_STATE_NOTATTACHED) { 43628808f00cSAlan Stern usb_lock_device(udev); 43638808f00cSAlan Stern if (portstatus & USB_PORT_STAT_ENABLE) { 43648808f00cSAlan Stern status = 0; /* Nothing to do */ 43658808f00cSAlan Stern 436684ebc102SAlan Stern #ifdef CONFIG_PM_RUNTIME 43675257d97aSAlan Stern } else if (udev->state == USB_STATE_SUSPENDED && 43685257d97aSAlan Stern udev->persist_enabled) { 43698808f00cSAlan Stern /* For a suspended device, treat this as a 43708808f00cSAlan Stern * remote wakeup event. 43718808f00cSAlan Stern */ 43720534d468SAlan Stern status = usb_remote_wakeup(udev); 43738808f00cSAlan Stern #endif 43748808f00cSAlan Stern 43758808f00cSAlan Stern } else { 43765257d97aSAlan Stern status = -ENODEV; /* Don't resuscitate */ 43778808f00cSAlan Stern } 43788808f00cSAlan Stern usb_unlock_device(udev); 43798808f00cSAlan Stern 43808808f00cSAlan Stern if (status == 0) { 43818808f00cSAlan Stern clear_bit(port1, hub->change_bits); 43828808f00cSAlan Stern return; 43838808f00cSAlan Stern } 43848808f00cSAlan Stern } 43858808f00cSAlan Stern 438624618b0cSAlan Stern /* Disconnect any existing devices under this port */ 4387b76baa81SPeter Chen if (udev) { 4388b76baa81SPeter Chen if (hcd->phy && !hdev->parent && 4389b76baa81SPeter Chen !(portstatus & USB_PORT_STAT_CONNECTION)) 4390ac96511bSPeter Chen usb_phy_notify_disconnect(hcd->phy, udev->speed); 4391ff823c79SLan Tianyu usb_disconnect(&hub->ports[port1 - 1]->child); 4392b76baa81SPeter Chen } 439324618b0cSAlan Stern clear_bit(port1, hub->change_bits); 439424618b0cSAlan Stern 4395253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 4396253e0572SAlan Stern * disconnect or the connect status changes. 4397253e0572SAlan Stern */ 4398253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4399253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 4400253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 4401253e0572SAlan Stern 44025257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 44035257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 4404ad493e5eSLan Tianyu status = hub_port_debounce_be_stable(hub, port1); 44055257d97aSAlan Stern if (status < 0) { 4406e9e88fb7SAlan Stern if (status != -ENODEV && printk_ratelimit()) 44075257d97aSAlan Stern dev_err(hub_dev, "connect-debounce failed, " 44085257d97aSAlan Stern "port %d disabled\n", port1); 44095257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 44105257d97aSAlan Stern } else { 44115257d97aSAlan Stern portstatus = status; 44125257d97aSAlan Stern } 44135257d97aSAlan Stern } 44145257d97aSAlan Stern 4415253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 4416253e0572SAlan Stern * the device was "removed". 4417253e0572SAlan Stern */ 4418253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4419253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 44201da177e4SLinus Torvalds 44211da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 442274ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 44230ed9a57eSAndiry Xu && !port_is_power_on(hub, portstatus)) 44241da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 44251da177e4SLinus Torvalds 44261da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 44271da177e4SLinus Torvalds goto done; 44281da177e4SLinus Torvalds return; 44291da177e4SLinus Torvalds } 4430430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hub->hdev)) 4431430ee58eSSebastian Andrzej Siewior unit_load = 150; 4432430ee58eSSebastian Andrzej Siewior else 4433430ee58eSSebastian Andrzej Siewior unit_load = 100; 44341da177e4SLinus Torvalds 4435e9e88fb7SAlan Stern status = 0; 44361da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 44371da177e4SLinus Torvalds 44381da177e4SLinus Torvalds /* reallocate for each attempt, since references 44391da177e4SLinus Torvalds * to the previous one can escape in various ways 44401da177e4SLinus Torvalds */ 44411da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 44421da177e4SLinus Torvalds if (!udev) { 44431da177e4SLinus Torvalds dev_err (hub_dev, 44441da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 44451da177e4SLinus Torvalds port1); 44461da177e4SLinus Torvalds goto done; 44471da177e4SLinus Torvalds } 44481da177e4SLinus Torvalds 44491da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 445055c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 4451b6956ffaSAlan Stern udev->level = hdev->level + 1; 44528af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 44531da177e4SLinus Torvalds 4454131dec34SSarah Sharp /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ 4455131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 4456e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 4457e7b77172SSarah Sharp else 4458e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 4459e7b77172SSarah Sharp 44603b29b68bSAlan Stern choose_devnum(udev); 4461c6515272SSarah Sharp if (udev->devnum <= 0) { 4462c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 4463c6515272SSarah Sharp goto loop; 4464c6515272SSarah Sharp } 4465c6515272SSarah Sharp 4466e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 44671da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 44681da177e4SLinus Torvalds if (status < 0) 44691da177e4SLinus Torvalds goto loop; 44701da177e4SLinus Torvalds 447193362a87SPhil Dibowitz usb_detect_quirks(udev); 447293362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 447393362a87SPhil Dibowitz msleep(1000); 447493362a87SPhil Dibowitz 44751da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 44761da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 44771da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 44781da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 44791da177e4SLinus Torvalds * on the parent. 44801da177e4SLinus Torvalds */ 44811da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 4482430ee58eSSebastian Andrzej Siewior && udev->bus_mA <= unit_load) { 44831da177e4SLinus Torvalds u16 devstat; 44841da177e4SLinus Torvalds 44851da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 44861da177e4SLinus Torvalds &devstat); 448715b7336eSAlan Stern if (status) { 44881da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 44891da177e4SLinus Torvalds goto loop_disable; 44901da177e4SLinus Torvalds } 44911da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 44921da177e4SLinus Torvalds dev_err(&udev->dev, 44931da177e4SLinus Torvalds "can't connect bus-powered hub " 44941da177e4SLinus Torvalds "to this port\n"); 44951da177e4SLinus Torvalds if (hub->has_indicators) { 44961da177e4SLinus Torvalds hub->indicator[port1-1] = 44971da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 4498c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 44991da177e4SLinus Torvalds } 45001da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 45011da177e4SLinus Torvalds goto loop_disable; 45021da177e4SLinus Torvalds } 45031da177e4SLinus Torvalds } 45041da177e4SLinus Torvalds 45051da177e4SLinus Torvalds /* check for devices running slower than they could */ 45061da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 45071da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 45081da177e4SLinus Torvalds && highspeed_hubs != 0) 45091da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 45101da177e4SLinus Torvalds 4511fa286188SGreg Kroah-Hartman /* Store the parent's children[] pointer. At this point 45121da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 45131da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 45141da177e4SLinus Torvalds */ 45151da177e4SLinus Torvalds status = 0; 45161da177e4SLinus Torvalds 45171da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 45181da177e4SLinus Torvalds * been disconnected; we would race with the 45191da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 45201da177e4SLinus Torvalds */ 45211da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 45221da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 45231da177e4SLinus Torvalds status = -ENOTCONN; 45241da177e4SLinus Torvalds else 4525ff823c79SLan Tianyu hub->ports[port1 - 1]->child = udev; 45261da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 45271da177e4SLinus Torvalds 45281da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 45291da177e4SLinus Torvalds if (!status) { 45301da177e4SLinus Torvalds status = usb_new_device(udev); 45311da177e4SLinus Torvalds if (status) { 45321da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 4533ff823c79SLan Tianyu hub->ports[port1 - 1]->child = NULL; 45341da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 45351da177e4SLinus Torvalds } 45361da177e4SLinus Torvalds } 45371da177e4SLinus Torvalds 45381da177e4SLinus Torvalds if (status) 45391da177e4SLinus Torvalds goto loop_disable; 45401da177e4SLinus Torvalds 45411da177e4SLinus Torvalds status = hub_power_remaining(hub); 45421da177e4SLinus Torvalds if (status) 454355c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 45441da177e4SLinus Torvalds 45451da177e4SLinus Torvalds return; 45461da177e4SLinus Torvalds 45471da177e4SLinus Torvalds loop_disable: 45481da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 45491da177e4SLinus Torvalds loop: 4550fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 45513b29b68bSAlan Stern release_devnum(udev); 4552f7410cedSHerbert Xu hub_free_dev(udev); 45531da177e4SLinus Torvalds usb_put_dev(udev); 4554ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 45551da177e4SLinus Torvalds break; 45561da177e4SLinus Torvalds } 45573a31155cSAlan Stern if (hub->hdev->parent || 45583a31155cSAlan Stern !hcd->driver->port_handed_over || 4559e9e88fb7SAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) { 4560e9e88fb7SAlan Stern if (status != -ENOTCONN && status != -ENODEV) 45613a31155cSAlan Stern dev_err(hub_dev, "unable to enumerate USB device on port %d\n", 45623a31155cSAlan Stern port1); 4563e9e88fb7SAlan Stern } 45641da177e4SLinus Torvalds 45651da177e4SLinus Torvalds done: 45661da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 456790da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 456890da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 45691da177e4SLinus Torvalds } 45701da177e4SLinus Torvalds 4571714b07beSSarah Sharp /* Returns 1 if there was a remote wakeup and a connect status change. */ 4572714b07beSSarah Sharp static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 457372937e1eSSarah Sharp u16 portstatus, u16 portchange) 4574714b07beSSarah Sharp { 4575714b07beSSarah Sharp struct usb_device *hdev; 4576714b07beSSarah Sharp struct usb_device *udev; 4577714b07beSSarah Sharp int connect_change = 0; 4578714b07beSSarah Sharp int ret; 4579714b07beSSarah Sharp 4580714b07beSSarah Sharp hdev = hub->hdev; 4581ff823c79SLan Tianyu udev = hub->ports[port - 1]->child; 45824ee823b8SSarah Sharp if (!hub_is_superspeed(hdev)) { 4583714b07beSSarah Sharp if (!(portchange & USB_PORT_STAT_C_SUSPEND)) 4584714b07beSSarah Sharp return 0; 4585ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); 45864ee823b8SSarah Sharp } else { 45874ee823b8SSarah Sharp if (!udev || udev->state != USB_STATE_SUSPENDED || 458872937e1eSSarah Sharp (portstatus & USB_PORT_STAT_LINK_STATE) != 458972937e1eSSarah Sharp USB_SS_PORT_LS_U0) 45904ee823b8SSarah Sharp return 0; 45914ee823b8SSarah Sharp } 4592714b07beSSarah Sharp 4593714b07beSSarah Sharp if (udev) { 4594714b07beSSarah Sharp /* TRSMRCY = 10 msec */ 4595714b07beSSarah Sharp msleep(10); 4596714b07beSSarah Sharp 4597714b07beSSarah Sharp usb_lock_device(udev); 4598714b07beSSarah Sharp ret = usb_remote_wakeup(udev); 4599714b07beSSarah Sharp usb_unlock_device(udev); 4600714b07beSSarah Sharp if (ret < 0) 4601714b07beSSarah Sharp connect_change = 1; 4602714b07beSSarah Sharp } else { 4603714b07beSSarah Sharp ret = -ENODEV; 4604714b07beSSarah Sharp hub_port_disable(hub, port, 1); 4605714b07beSSarah Sharp } 4606714b07beSSarah Sharp dev_dbg(hub->intfdev, "resume on port %d, status %d\n", 4607714b07beSSarah Sharp port, ret); 4608714b07beSSarah Sharp return connect_change; 4609714b07beSSarah Sharp } 4610714b07beSSarah Sharp 46111da177e4SLinus Torvalds static void hub_events(void) 46121da177e4SLinus Torvalds { 46131da177e4SLinus Torvalds struct list_head *tmp; 46141da177e4SLinus Torvalds struct usb_device *hdev; 46151da177e4SLinus Torvalds struct usb_interface *intf; 46161da177e4SLinus Torvalds struct usb_hub *hub; 46171da177e4SLinus Torvalds struct device *hub_dev; 46181da177e4SLinus Torvalds u16 hubstatus; 46191da177e4SLinus Torvalds u16 hubchange; 46201da177e4SLinus Torvalds u16 portstatus; 46211da177e4SLinus Torvalds u16 portchange; 46221da177e4SLinus Torvalds int i, ret; 46234ee823b8SSarah Sharp int connect_change, wakeup_change; 46241da177e4SLinus Torvalds 46251da177e4SLinus Torvalds /* 46261da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 46271da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 46281da177e4SLinus Torvalds * safe since we delete the hub from the event list. 46291da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 46301da177e4SLinus Torvalds */ 46311da177e4SLinus Torvalds while (1) { 46321da177e4SLinus Torvalds 46331da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 46341da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 46351da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 46361da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 46371da177e4SLinus Torvalds break; 46381da177e4SLinus Torvalds } 46391da177e4SLinus Torvalds 46401da177e4SLinus Torvalds tmp = hub_event_list.next; 46411da177e4SLinus Torvalds list_del_init(tmp); 46421da177e4SLinus Torvalds 46431da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 4644e8054854SAlan Stern kref_get(&hub->kref); 4645e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 46461da177e4SLinus Torvalds 4647e8054854SAlan Stern hdev = hub->hdev; 4648e8054854SAlan Stern hub_dev = hub->intfdev; 4649e8054854SAlan Stern intf = to_usb_interface(hub_dev); 465040f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 46513bbc47d8SKrzysztof Mazur hdev->state, hdev->maxchild, 46521da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 46531da177e4SLinus Torvalds (u16) hub->change_bits[0], 465440f122f3SAlan Stern (u16) hub->event_bits[0]); 46551da177e4SLinus Torvalds 46561da177e4SLinus Torvalds /* Lock the device, then check to see if we were 46571da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 465806b84e8aSAlan Stern usb_lock_device(hdev); 4659e8054854SAlan Stern if (unlikely(hub->disconnected)) 46609bbdf1e0SAlan Stern goto loop_disconnected; 46611da177e4SLinus Torvalds 46621da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 46631da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 46647de18d8bSAlan Stern hub->error = -ENODEV; 46654330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 46661da177e4SLinus Torvalds goto loop; 46671da177e4SLinus Torvalds } 46681da177e4SLinus Torvalds 466940f122f3SAlan Stern /* Autoresume */ 467040f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 467140f122f3SAlan Stern if (ret) { 467240f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 46731da177e4SLinus Torvalds goto loop; 467440f122f3SAlan Stern } 467540f122f3SAlan Stern 467640f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 467740f122f3SAlan Stern if (hub->quiescing) 467840f122f3SAlan Stern goto loop_autopm; 46791da177e4SLinus Torvalds 46801da177e4SLinus Torvalds if (hub->error) { 46811da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 46821da177e4SLinus Torvalds hub->error); 46831da177e4SLinus Torvalds 4684742120c6SMing Lei ret = usb_reset_device(hdev); 46851da177e4SLinus Torvalds if (ret) { 46861da177e4SLinus Torvalds dev_dbg (hub_dev, 46871da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 468840f122f3SAlan Stern goto loop_autopm; 46891da177e4SLinus Torvalds } 46901da177e4SLinus Torvalds 46911da177e4SLinus Torvalds hub->nerrors = 0; 46921da177e4SLinus Torvalds hub->error = 0; 46931da177e4SLinus Torvalds } 46941da177e4SLinus Torvalds 46951da177e4SLinus Torvalds /* deal with port status changes */ 46963bbc47d8SKrzysztof Mazur for (i = 1; i <= hdev->maxchild; i++) { 46971da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 46981da177e4SLinus Torvalds continue; 46991da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 470072937e1eSSarah Sharp wakeup_change = test_and_clear_bit(i, hub->wakeup_bits); 47011da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 47024ee823b8SSarah Sharp !connect_change && !wakeup_change) 47031da177e4SLinus Torvalds continue; 47041da177e4SLinus Torvalds 47051da177e4SLinus Torvalds ret = hub_port_status(hub, i, 47061da177e4SLinus Torvalds &portstatus, &portchange); 47071da177e4SLinus Torvalds if (ret < 0) 47081da177e4SLinus Torvalds continue; 47091da177e4SLinus Torvalds 47101da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 4711ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47121da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 47131da177e4SLinus Torvalds connect_change = 1; 47141da177e4SLinus Torvalds } 47151da177e4SLinus Torvalds 47161da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 47171da177e4SLinus Torvalds if (!connect_change) 47181da177e4SLinus Torvalds dev_dbg (hub_dev, 47191da177e4SLinus Torvalds "port %d enable change, " 47201da177e4SLinus Torvalds "status %08x\n", 47211da177e4SLinus Torvalds i, portstatus); 4722ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47231da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 47241da177e4SLinus Torvalds 47251da177e4SLinus Torvalds /* 47261da177e4SLinus Torvalds * EM interference sometimes causes badly 47271da177e4SLinus Torvalds * shielded USB devices to be shutdown by 47281da177e4SLinus Torvalds * the hub, this hack enables them again. 47291da177e4SLinus Torvalds * Works at least with mouse driver. 47301da177e4SLinus Torvalds */ 47311da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 47321da177e4SLinus Torvalds && !connect_change 4733ff823c79SLan Tianyu && hub->ports[i - 1]->child) { 47341da177e4SLinus Torvalds dev_err (hub_dev, 47351da177e4SLinus Torvalds "port %i " 47361da177e4SLinus Torvalds "disabled by hub (EMI?), " 47371da177e4SLinus Torvalds "re-enabling...\n", 47381da177e4SLinus Torvalds i); 47391da177e4SLinus Torvalds connect_change = 1; 47401da177e4SLinus Torvalds } 47411da177e4SLinus Torvalds } 47421da177e4SLinus Torvalds 474372937e1eSSarah Sharp if (hub_handle_remote_wakeup(hub, i, 474472937e1eSSarah Sharp portstatus, portchange)) 47451da177e4SLinus Torvalds connect_change = 1; 47461da177e4SLinus Torvalds 47471da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 4748752d57a8SPaul Bolle u16 status = 0; 4749752d57a8SPaul Bolle u16 unused; 4750752d57a8SPaul Bolle 4751752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change on port " 4752752d57a8SPaul Bolle "%d\n", i); 4753ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47541da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 4755752d57a8SPaul Bolle msleep(100); /* Cool down */ 47568520f380SAlan Stern hub_power_on(hub, true); 4757752d57a8SPaul Bolle hub_port_status(hub, i, &status, &unused); 4758752d57a8SPaul Bolle if (status & USB_PORT_STAT_OVERCURRENT) 4759752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 4760752d57a8SPaul Bolle "condition on port %d\n", i); 47611da177e4SLinus Torvalds } 47621da177e4SLinus Torvalds 47631da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 47641da177e4SLinus Torvalds dev_dbg (hub_dev, 47651da177e4SLinus Torvalds "reset change on port %d\n", 47661da177e4SLinus Torvalds i); 4767ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47681da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 47691da177e4SLinus Torvalds } 4770c7061574SSarah Sharp if ((portchange & USB_PORT_STAT_C_BH_RESET) && 4771c7061574SSarah Sharp hub_is_superspeed(hub->hdev)) { 4772c7061574SSarah Sharp dev_dbg(hub_dev, 4773c7061574SSarah Sharp "warm reset change on port %d\n", 4774c7061574SSarah Sharp i); 4775ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 4776c7061574SSarah Sharp USB_PORT_FEAT_C_BH_PORT_RESET); 4777c7061574SSarah Sharp } 4778dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_LINK_STATE) { 4779ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, i, 4780dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_LINK_STATE); 4781dbe79bbeSJohn Youn } 4782dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 4783dbe79bbeSJohn Youn dev_warn(hub_dev, 4784dbe79bbeSJohn Youn "config error on port %d\n", 4785dbe79bbeSJohn Youn i); 4786ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, i, 4787dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 4788dbe79bbeSJohn Youn } 47891da177e4SLinus Torvalds 47905e467f6eSAndiry Xu /* Warm reset a USB3 protocol port if it's in 47915e467f6eSAndiry Xu * SS.Inactive state. 47925e467f6eSAndiry Xu */ 47938bea2bd3SStanislaw Ledwon if (hub_port_warm_reset_required(hub, portstatus)) { 479465bdac5eSSarah Sharp int status; 4795d3b9d7a9SSarah Sharp struct usb_device *udev = 4796d3b9d7a9SSarah Sharp hub->ports[i - 1]->child; 479765bdac5eSSarah Sharp 47985e467f6eSAndiry Xu dev_dbg(hub_dev, "warm reset port %d\n", i); 4799f3e94aa1SJulius Werner if (!udev || !(portstatus & 4800f3e94aa1SJulius Werner USB_PORT_STAT_CONNECTION)) { 4801d3b9d7a9SSarah Sharp status = hub_port_reset(hub, i, 4802d3b9d7a9SSarah Sharp NULL, HUB_BH_RESET_TIME, 4803d3b9d7a9SSarah Sharp true); 480465bdac5eSSarah Sharp if (status < 0) 480565bdac5eSSarah Sharp hub_port_disable(hub, i, 1); 4806d3b9d7a9SSarah Sharp } else { 4807d3b9d7a9SSarah Sharp usb_lock_device(udev); 4808d3b9d7a9SSarah Sharp status = usb_reset_device(udev); 4809d3b9d7a9SSarah Sharp usb_unlock_device(udev); 481065bdac5eSSarah Sharp connect_change = 0; 48115e467f6eSAndiry Xu } 4812f3e94aa1SJulius Werner } 48135e467f6eSAndiry Xu 48141da177e4SLinus Torvalds if (connect_change) 48151da177e4SLinus Torvalds hub_port_connect_change(hub, i, 48161da177e4SLinus Torvalds portstatus, portchange); 48171da177e4SLinus Torvalds } /* end for i */ 48181da177e4SLinus Torvalds 48191da177e4SLinus Torvalds /* deal with hub status changes */ 48201da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 48211da177e4SLinus Torvalds ; /* do nothing */ 48221da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 48231da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 48241da177e4SLinus Torvalds else { 48251da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 48261da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 48271da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 482855c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 482955c52718SAlan Stern /* FIXME: Is this always true? */ 483055c52718SAlan Stern hub->limited_power = 1; 4831403fae78Sjidong xiao else 4832403fae78Sjidong xiao hub->limited_power = 0; 48331da177e4SLinus Torvalds } 48341da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 4835752d57a8SPaul Bolle u16 status = 0; 4836752d57a8SPaul Bolle u16 unused; 4837752d57a8SPaul Bolle 4838752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 48391da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 4840752d57a8SPaul Bolle msleep(500); /* Cool down */ 48418520f380SAlan Stern hub_power_on(hub, true); 4842752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 4843752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 4844752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 4845752d57a8SPaul Bolle "condition\n"); 48461da177e4SLinus Torvalds } 48471da177e4SLinus Torvalds } 48481da177e4SLinus Torvalds 484940f122f3SAlan Stern loop_autopm: 48508e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 48518e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 48521da177e4SLinus Torvalds loop: 48538e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface_no_resume() in 48548e4ceb38SAlan Stern * kick_khubd() and allow autosuspend. 48558e4ceb38SAlan Stern */ 48568e4ceb38SAlan Stern usb_autopm_put_interface(intf); 48579bbdf1e0SAlan Stern loop_disconnected: 48581da177e4SLinus Torvalds usb_unlock_device(hdev); 4859e8054854SAlan Stern kref_put(&hub->kref, hub_release); 48601da177e4SLinus Torvalds 48611da177e4SLinus Torvalds } /* end while (1) */ 48621da177e4SLinus Torvalds } 48631da177e4SLinus Torvalds 48641da177e4SLinus Torvalds static int hub_thread(void *__unused) 48651da177e4SLinus Torvalds { 48663bb1af52SAlan Stern /* khubd needs to be freezable to avoid intefering with USB-PERSIST 48673bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 48683bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 48693bb1af52SAlan Stern * the companion full-speed controller. 48703bb1af52SAlan Stern */ 487183144186SRafael J. Wysocki set_freezable(); 48723bb1af52SAlan Stern 48731da177e4SLinus Torvalds do { 48741da177e4SLinus Torvalds hub_events(); 4875e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 48769c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 48779c8d6178Sakpm@osdl.org kthread_should_stop()); 48789c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 48791da177e4SLinus Torvalds 48801da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 48819c8d6178Sakpm@osdl.org return 0; 48821da177e4SLinus Torvalds } 48831da177e4SLinus Torvalds 48841e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 4885e6f30deaSMing Lei { .match_flags = USB_DEVICE_ID_MATCH_VENDOR 4886e6f30deaSMing Lei | USB_DEVICE_ID_MATCH_INT_CLASS, 4887e6f30deaSMing Lei .idVendor = USB_VENDOR_GENESYS_LOGIC, 4888e6f30deaSMing Lei .bInterfaceClass = USB_CLASS_HUB, 4889e6f30deaSMing Lei .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, 48901da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 48911da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 48921da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 48931da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 48941da177e4SLinus Torvalds { } /* Terminating entry */ 48951da177e4SLinus Torvalds }; 48961da177e4SLinus Torvalds 48971da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 48981da177e4SLinus Torvalds 48991da177e4SLinus Torvalds static struct usb_driver hub_driver = { 49001da177e4SLinus Torvalds .name = "hub", 49011da177e4SLinus Torvalds .probe = hub_probe, 49021da177e4SLinus Torvalds .disconnect = hub_disconnect, 49031da177e4SLinus Torvalds .suspend = hub_suspend, 49041da177e4SLinus Torvalds .resume = hub_resume, 4905f07600cfSAlan Stern .reset_resume = hub_reset_resume, 49067de18d8bSAlan Stern .pre_reset = hub_pre_reset, 49077de18d8bSAlan Stern .post_reset = hub_post_reset, 4908c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 49091da177e4SLinus Torvalds .id_table = hub_id_table, 491040f122f3SAlan Stern .supports_autosuspend = 1, 49111da177e4SLinus Torvalds }; 49121da177e4SLinus Torvalds 49131da177e4SLinus Torvalds int usb_hub_init(void) 49141da177e4SLinus Torvalds { 49151da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 49161da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 49171da177e4SLinus Torvalds usbcore_name); 49181da177e4SLinus Torvalds return -1; 49191da177e4SLinus Torvalds } 49201da177e4SLinus Torvalds 49219c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 49229c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 49231da177e4SLinus Torvalds return 0; 49241da177e4SLinus Torvalds 49251da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 49261da177e4SLinus Torvalds usb_deregister(&hub_driver); 49271da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 49281da177e4SLinus Torvalds 49291da177e4SLinus Torvalds return -1; 49301da177e4SLinus Torvalds } 49311da177e4SLinus Torvalds 49321da177e4SLinus Torvalds void usb_hub_cleanup(void) 49331da177e4SLinus Torvalds { 49349c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 49351da177e4SLinus Torvalds 49361da177e4SLinus Torvalds /* 49371da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 49381da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 49391da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 49401da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 49411da177e4SLinus Torvalds * individual hub resources. -greg 49421da177e4SLinus Torvalds */ 49431da177e4SLinus Torvalds usb_deregister(&hub_driver); 49441da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 49451da177e4SLinus Torvalds 4946eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 4947eb764c4bSAlan Stern struct usb_device_descriptor *old_device_descriptor) 49481da177e4SLinus Torvalds { 4949eb764c4bSAlan Stern int changed = 0; 49501da177e4SLinus Torvalds unsigned index; 4951eb764c4bSAlan Stern unsigned serial_len = 0; 4952eb764c4bSAlan Stern unsigned len; 4953eb764c4bSAlan Stern unsigned old_length; 4954eb764c4bSAlan Stern int length; 4955eb764c4bSAlan Stern char *buf; 49561da177e4SLinus Torvalds 4957eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 4958eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 4959eb764c4bSAlan Stern return 1; 4960eb764c4bSAlan Stern 4961eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 4962eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 4963eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 4964eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 4965eb764c4bSAlan Stern * different flash card of the same brand). 4966eb764c4bSAlan Stern */ 4967eb764c4bSAlan Stern if (udev->serial) 4968eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 4969eb764c4bSAlan Stern 4970eb764c4bSAlan Stern len = serial_len; 49711da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 4972eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 4973eb764c4bSAlan Stern len = max(len, old_length); 49741da177e4SLinus Torvalds } 4975eb764c4bSAlan Stern 49760cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 49771da177e4SLinus Torvalds if (buf == NULL) { 49781da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 49791da177e4SLinus Torvalds /* assume the worst */ 49801da177e4SLinus Torvalds return 1; 49811da177e4SLinus Torvalds } 49821da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 4983eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 49841da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 49851da177e4SLinus Torvalds old_length); 4986eb764c4bSAlan Stern if (length != old_length) { 49871da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 49881da177e4SLinus Torvalds index, length); 4989eb764c4bSAlan Stern changed = 1; 49901da177e4SLinus Torvalds break; 49911da177e4SLinus Torvalds } 49921da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 49931da177e4SLinus Torvalds != 0) { 49941da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 4995eb764c4bSAlan Stern index, 4996eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 4997eb764c4bSAlan Stern bConfigurationValue); 4998eb764c4bSAlan Stern changed = 1; 49991da177e4SLinus Torvalds break; 50001da177e4SLinus Torvalds } 50011da177e4SLinus Torvalds } 5002eb764c4bSAlan Stern 5003eb764c4bSAlan Stern if (!changed && serial_len) { 5004eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 5005eb764c4bSAlan Stern buf, serial_len); 5006eb764c4bSAlan Stern if (length + 1 != serial_len) { 5007eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 5008eb764c4bSAlan Stern length); 5009eb764c4bSAlan Stern changed = 1; 5010eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 5011eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 5012eb764c4bSAlan Stern changed = 1; 5013eb764c4bSAlan Stern } 5014eb764c4bSAlan Stern } 5015eb764c4bSAlan Stern 50161da177e4SLinus Torvalds kfree(buf); 5017eb764c4bSAlan Stern return changed; 50181da177e4SLinus Torvalds } 50191da177e4SLinus Torvalds 50201da177e4SLinus Torvalds /** 5021742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 50221da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 50231da177e4SLinus Torvalds * 502479efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 502579efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 5026742120c6SMing Lei * Use usb_reset_device() instead. 50271da177e4SLinus Torvalds * 50281da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 50291da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 50301da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 50311da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 50321da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 50331da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 50341da177e4SLinus Torvalds * re-enumerated and probed all over again. 50351da177e4SLinus Torvalds * 5036626f090cSYacine Belkadi * Return: 0 if the reset succeeded, -ENODEV if the device has been 50371da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 50381da177e4SLinus Torvalds * if the reset wasn't even attempted. 50391da177e4SLinus Torvalds * 5040626f090cSYacine Belkadi * Note: 50411da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 50421da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 50431da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 50441da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 50456bc6cff5SAlan Stern * 50466bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 50476bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 50486bc6cff5SAlan Stern * holding the device lock because these tasks should always call 50496bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 50501da177e4SLinus Torvalds */ 5051742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 50521da177e4SLinus Torvalds { 50531da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 50541da177e4SLinus Torvalds struct usb_hub *parent_hub; 50553f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 50561da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 505712c3da34SAlan Stern int i, ret = 0; 505812c3da34SAlan Stern int port1 = udev->portnum; 50591da177e4SLinus Torvalds 50601da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 50611da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 50621da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 50631da177e4SLinus Torvalds udev->state); 50641da177e4SLinus Torvalds return -EINVAL; 50651da177e4SLinus Torvalds } 50661da177e4SLinus Torvalds 50671da177e4SLinus Torvalds if (!parent_hdev) { 50684bec9917SWolfram Sang /* this requires hcd-specific logic; see ohci_restart() */ 5069441b62c1SHarvey Harrison dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 50701da177e4SLinus Torvalds return -EISDIR; 50711da177e4SLinus Torvalds } 5072ad493e5eSLan Tianyu parent_hub = usb_hub_to_struct_hub(parent_hdev); 50731da177e4SLinus Torvalds 5074f74631e3SSarah Sharp /* Disable LPM and LTM while we reset the device and reinstall the alt 5075f74631e3SSarah Sharp * settings. Device-initiated LPM settings, and system exit latency 5076f74631e3SSarah Sharp * settings are cleared when the device is reset, so we have to set 5077f74631e3SSarah Sharp * them up again. 50786d1d0513SSarah Sharp */ 50796d1d0513SSarah Sharp ret = usb_unlocked_disable_lpm(udev); 50806d1d0513SSarah Sharp if (ret) { 50816d1d0513SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); 50826d1d0513SSarah Sharp goto re_enumerate; 50836d1d0513SSarah Sharp } 5084f74631e3SSarah Sharp ret = usb_disable_ltm(udev); 5085f74631e3SSarah Sharp if (ret) { 5086f74631e3SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LTM\n.", 5087f74631e3SSarah Sharp __func__); 5088f74631e3SSarah Sharp goto re_enumerate; 5089f74631e3SSarah Sharp } 50906d1d0513SSarah Sharp 50911da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 50921da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 50931da177e4SLinus Torvalds 50941da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 50951da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 5096fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 50971da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 5098dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 50991da177e4SLinus Torvalds break; 51001da177e4SLinus Torvalds } 51011da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 5102d5cbad4bSAlan Stern 51031da177e4SLinus Torvalds if (ret < 0) 51041da177e4SLinus Torvalds goto re_enumerate; 51051da177e4SLinus Torvalds 51061da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 5107eb764c4bSAlan Stern if (descriptors_changed(udev, &descriptor)) { 51081da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 51091da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 51101da177e4SLinus Torvalds goto re_enumerate; 51111da177e4SLinus Torvalds } 51121da177e4SLinus Torvalds 51134fe0387aSAlan Stern /* Restore the device's previous configuration */ 51141da177e4SLinus Torvalds if (!udev->actconfig) 51151da177e4SLinus Torvalds goto done; 51163f0479e0SSarah Sharp 5117d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 51183f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 51193f0479e0SSarah Sharp if (ret < 0) { 51203f0479e0SSarah Sharp dev_warn(&udev->dev, 51213f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 51223f0479e0SSarah Sharp "old configuration.\n"); 5123d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 51243f0479e0SSarah Sharp goto re_enumerate; 51253f0479e0SSarah Sharp } 51261da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 51271da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 51281da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 51291da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 51301da177e4SLinus Torvalds if (ret < 0) { 51311da177e4SLinus Torvalds dev_err(&udev->dev, 51321da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 51331da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 5134d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 51351da177e4SLinus Torvalds goto re_enumerate; 51361da177e4SLinus Torvalds } 5137d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 51381da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 51391da177e4SLinus Torvalds 51404fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 51414fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 51424fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 51434fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 51444fe0387aSAlan Stern * endpoint state. 51454fe0387aSAlan Stern */ 51461da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 51473f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 51483f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 51491da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 51501da177e4SLinus Torvalds 51511da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 51524fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 51534fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 51544fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 51554fe0387aSAlan Stern ret = 0; 51564fe0387aSAlan Stern } else { 515704a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 515804a723eaSSarah Sharp * device has been reset, and it will have to use 515904a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 51603f0479e0SSarah Sharp */ 516104a723eaSSarah Sharp intf->resetting_device = 1; 51621da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 51631da177e4SLinus Torvalds desc->bAlternateSetting); 516404a723eaSSarah Sharp intf->resetting_device = 0; 51654fe0387aSAlan Stern } 51661da177e4SLinus Torvalds if (ret < 0) { 51671da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 51681da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 51691da177e4SLinus Torvalds desc->bInterfaceNumber, 51701da177e4SLinus Torvalds desc->bAlternateSetting, 51711da177e4SLinus Torvalds ret); 51721da177e4SLinus Torvalds goto re_enumerate; 51731da177e4SLinus Torvalds } 51741da177e4SLinus Torvalds } 51751da177e4SLinus Torvalds 51761da177e4SLinus Torvalds done: 5177f74631e3SSarah Sharp /* Now that the alt settings are re-installed, enable LTM and LPM. */ 517878d9a487SAlan Stern usb_unlocked_enable_lpm(udev); 5179f74631e3SSarah Sharp usb_enable_ltm(udev); 51801da177e4SLinus Torvalds return 0; 51811da177e4SLinus Torvalds 51821da177e4SLinus Torvalds re_enumerate: 51836d1d0513SSarah Sharp /* LPM state doesn't matter when we're about to destroy the device. */ 51841da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 51851da177e4SLinus Torvalds return -ENODEV; 51861da177e4SLinus Torvalds } 51871da177e4SLinus Torvalds 51881da177e4SLinus Torvalds /** 51891da177e4SLinus Torvalds * usb_reset_device - warn interface drivers and perform a USB port reset 51901da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 51911da177e4SLinus Torvalds * 519279efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 519379efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 5194742120c6SMing Lei * the reset is over (using their post_reset method). 519579efa097SAlan Stern * 5196626f090cSYacine Belkadi * Return: The same as for usb_reset_and_verify_device(). 519779efa097SAlan Stern * 5198626f090cSYacine Belkadi * Note: 519979efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 520079efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 520179efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 5202742120c6SMing Lei * the device using usb_lock_device_for_reset(). 520379efa097SAlan Stern * 520479efa097SAlan Stern * If an interface is currently being probed or disconnected, we assume 520579efa097SAlan Stern * its driver knows how to handle resets. For all other interfaces, 520679efa097SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 520779efa097SAlan Stern * we attempt to unbind it and rebind afterward. 520879efa097SAlan Stern */ 5209742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 521079efa097SAlan Stern { 521179efa097SAlan Stern int ret; 5212852c4b43SAlan Stern int i; 52134d769defSMing Lei unsigned int noio_flag; 521479efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 521579efa097SAlan Stern 521679efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 521779efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 521879efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 521979efa097SAlan Stern udev->state); 522079efa097SAlan Stern return -EINVAL; 522179efa097SAlan Stern } 522279efa097SAlan Stern 52234d769defSMing Lei /* 52244d769defSMing Lei * Don't allocate memory with GFP_KERNEL in current 52254d769defSMing Lei * context to avoid possible deadlock if usb mass 52264d769defSMing Lei * storage interface or usbnet interface(iSCSI case) 52274d769defSMing Lei * is included in current configuration. The easist 52284d769defSMing Lei * approach is to do it for every device reset, 52294d769defSMing Lei * because the device 'memalloc_noio' flag may have 52304d769defSMing Lei * not been set before reseting the usb device. 52314d769defSMing Lei */ 52324d769defSMing Lei noio_flag = memalloc_noio_save(); 52334d769defSMing Lei 5234645daaabSAlan Stern /* Prevent autosuspend during the reset */ 523594fcda1fSAlan Stern usb_autoresume_device(udev); 5236645daaabSAlan Stern 523779efa097SAlan Stern if (config) { 5238852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 5239852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 524079efa097SAlan Stern struct usb_driver *drv; 524178d9a487SAlan Stern int unbind = 0; 524279efa097SAlan Stern 5243852c4b43SAlan Stern if (cintf->dev.driver) { 524479efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 524578d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 524678d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 524778d9a487SAlan Stern else if (cintf->condition == 524878d9a487SAlan Stern USB_INTERFACE_BOUND) 524978d9a487SAlan Stern unbind = 1; 525078d9a487SAlan Stern if (unbind) 525178d9a487SAlan Stern usb_forced_unbind_intf(cintf); 525279efa097SAlan Stern } 525379efa097SAlan Stern } 525479efa097SAlan Stern } 525579efa097SAlan Stern 5256742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 525779efa097SAlan Stern 525879efa097SAlan Stern if (config) { 5259852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 5260852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 526179efa097SAlan Stern struct usb_driver *drv; 526278d9a487SAlan Stern int rebind = cintf->needs_binding; 526379efa097SAlan Stern 526478d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 526579efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 526679efa097SAlan Stern if (drv->post_reset) 526778d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 526878d9a487SAlan Stern else if (cintf->condition == 526978d9a487SAlan Stern USB_INTERFACE_BOUND) 527078d9a487SAlan Stern rebind = 1; 527179efa097SAlan Stern } 52726c640945SAlan Stern if (ret == 0 && rebind) 527378d9a487SAlan Stern usb_rebind_intf(cintf); 527479efa097SAlan Stern } 527579efa097SAlan Stern } 527679efa097SAlan Stern 527794fcda1fSAlan Stern usb_autosuspend_device(udev); 52784d769defSMing Lei memalloc_noio_restore(noio_flag); 527979efa097SAlan Stern return ret; 528079efa097SAlan Stern } 5281742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 5282dc023dceSInaky Perez-Gonzalez 5283dc023dceSInaky Perez-Gonzalez 5284dc023dceSInaky Perez-Gonzalez /** 5285dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 5286dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 5287dc023dceSInaky Perez-Gonzalez * 5288dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 5289dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 5290dc023dceSInaky Perez-Gonzalez * 5291dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 5292dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 5293dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 5294dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 5295dc023dceSInaky Perez-Gonzalez * 5296dc023dceSInaky Perez-Gonzalez * Corner cases: 5297dc023dceSInaky Perez-Gonzalez * 5298dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 5299dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 5300dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 5301dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 5302dc023dceSInaky Perez-Gonzalez * 5303dc023dceSInaky Perez-Gonzalez * - If a driver is unbound and it had a pending reset, the reset will 5304dc023dceSInaky Perez-Gonzalez * be cancelled. 5305dc023dceSInaky Perez-Gonzalez * 5306dc023dceSInaky Perez-Gonzalez * - This function can be called during .probe() or .disconnect() 5307dc023dceSInaky Perez-Gonzalez * times. On return from .disconnect(), any pending resets will be 5308dc023dceSInaky Perez-Gonzalez * cancelled. 5309dc023dceSInaky Perez-Gonzalez * 5310dc023dceSInaky Perez-Gonzalez * There is no no need to lock/unlock the @reset_ws as schedule_work() 5311dc023dceSInaky Perez-Gonzalez * does its own. 5312dc023dceSInaky Perez-Gonzalez * 5313dc023dceSInaky Perez-Gonzalez * NOTE: We don't do any reference count tracking because it is not 5314dc023dceSInaky Perez-Gonzalez * needed. The lifecycle of the work_struct is tied to the 5315dc023dceSInaky Perez-Gonzalez * usb_interface. Before destroying the interface we cancel the 5316dc023dceSInaky Perez-Gonzalez * work_struct, so the fact that work_struct is queued and or 5317dc023dceSInaky Perez-Gonzalez * running means the interface (and thus, the device) exist and 5318dc023dceSInaky Perez-Gonzalez * are referenced. 5319dc023dceSInaky Perez-Gonzalez */ 5320dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 5321dc023dceSInaky Perez-Gonzalez { 5322dc023dceSInaky Perez-Gonzalez schedule_work(&iface->reset_ws); 5323dc023dceSInaky Perez-Gonzalez } 5324dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 5325ff823c79SLan Tianyu 5326ff823c79SLan Tianyu /** 5327ff823c79SLan Tianyu * usb_hub_find_child - Get the pointer of child device 5328ff823c79SLan Tianyu * attached to the port which is specified by @port1. 5329ff823c79SLan Tianyu * @hdev: USB device belonging to the usb hub 5330ff823c79SLan Tianyu * @port1: port num to indicate which port the child device 5331ff823c79SLan Tianyu * is attached to. 5332ff823c79SLan Tianyu * 5333ff823c79SLan Tianyu * USB drivers call this function to get hub's child device 5334ff823c79SLan Tianyu * pointer. 5335ff823c79SLan Tianyu * 5336626f090cSYacine Belkadi * Return: %NULL if input param is invalid and 5337ff823c79SLan Tianyu * child's usb_device pointer if non-NULL. 5338ff823c79SLan Tianyu */ 5339ff823c79SLan Tianyu struct usb_device *usb_hub_find_child(struct usb_device *hdev, 5340ff823c79SLan Tianyu int port1) 5341ff823c79SLan Tianyu { 5342ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5343ff823c79SLan Tianyu 5344ff823c79SLan Tianyu if (port1 < 1 || port1 > hdev->maxchild) 5345ff823c79SLan Tianyu return NULL; 5346ff823c79SLan Tianyu return hub->ports[port1 - 1]->child; 5347ff823c79SLan Tianyu } 5348ff823c79SLan Tianyu EXPORT_SYMBOL_GPL(usb_hub_find_child); 5349d5575424SLan Tianyu 535005f91689SLan Tianyu /** 535105f91689SLan Tianyu * usb_set_hub_port_connect_type - set hub port connect type. 535205f91689SLan Tianyu * @hdev: USB device belonging to the usb hub 535305f91689SLan Tianyu * @port1: port num of the port 535405f91689SLan Tianyu * @type: connect type of the port 535505f91689SLan Tianyu */ 535605f91689SLan Tianyu void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1, 535705f91689SLan Tianyu enum usb_port_connect_type type) 535805f91689SLan Tianyu { 5359ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 536005f91689SLan Tianyu 536141341261SMathias Nyman if (hub) 536205f91689SLan Tianyu hub->ports[port1 - 1]->connect_type = type; 536305f91689SLan Tianyu } 536405f91689SLan Tianyu 536505f91689SLan Tianyu /** 536605f91689SLan Tianyu * usb_get_hub_port_connect_type - Get the port's connect type 536705f91689SLan Tianyu * @hdev: USB device belonging to the usb hub 536805f91689SLan Tianyu * @port1: port num of the port 536905f91689SLan Tianyu * 5370626f090cSYacine Belkadi * Return: The connect type of the port if successful. Or 5371626f090cSYacine Belkadi * USB_PORT_CONNECT_TYPE_UNKNOWN if input params are invalid. 537205f91689SLan Tianyu */ 537305f91689SLan Tianyu enum usb_port_connect_type 537405f91689SLan Tianyu usb_get_hub_port_connect_type(struct usb_device *hdev, int port1) 537505f91689SLan Tianyu { 5376ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 537705f91689SLan Tianyu 537841341261SMathias Nyman if (!hub) 537941341261SMathias Nyman return USB_PORT_CONNECT_TYPE_UNKNOWN; 538041341261SMathias Nyman 538105f91689SLan Tianyu return hub->ports[port1 - 1]->connect_type; 538205f91689SLan Tianyu } 538305f91689SLan Tianyu 5384d2123fd9SLan Tianyu void usb_hub_adjust_deviceremovable(struct usb_device *hdev, 5385d2123fd9SLan Tianyu struct usb_hub_descriptor *desc) 5386d2123fd9SLan Tianyu { 5387d2123fd9SLan Tianyu enum usb_port_connect_type connect_type; 5388d2123fd9SLan Tianyu int i; 5389d2123fd9SLan Tianyu 5390d2123fd9SLan Tianyu if (!hub_is_superspeed(hdev)) { 5391d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5392d2123fd9SLan Tianyu connect_type = usb_get_hub_port_connect_type(hdev, i); 5393d2123fd9SLan Tianyu 5394d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5395d2123fd9SLan Tianyu u8 mask = 1 << (i%8); 5396d2123fd9SLan Tianyu 5397d2123fd9SLan Tianyu if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { 5398d2123fd9SLan Tianyu dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", 5399d2123fd9SLan Tianyu i); 5400d2123fd9SLan Tianyu desc->u.hs.DeviceRemovable[i/8] |= mask; 5401d2123fd9SLan Tianyu } 5402d2123fd9SLan Tianyu } 5403d2123fd9SLan Tianyu } 5404d2123fd9SLan Tianyu } else { 5405d2123fd9SLan Tianyu u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); 5406d2123fd9SLan Tianyu 5407d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5408d2123fd9SLan Tianyu connect_type = usb_get_hub_port_connect_type(hdev, i); 5409d2123fd9SLan Tianyu 5410d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5411d2123fd9SLan Tianyu u16 mask = 1 << i; 5412d2123fd9SLan Tianyu 5413d2123fd9SLan Tianyu if (!(port_removable & mask)) { 5414d2123fd9SLan Tianyu dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", 5415d2123fd9SLan Tianyu i); 5416d2123fd9SLan Tianyu port_removable |= mask; 5417d2123fd9SLan Tianyu } 5418d2123fd9SLan Tianyu } 5419d2123fd9SLan Tianyu } 5420d2123fd9SLan Tianyu 5421d2123fd9SLan Tianyu desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); 5422d2123fd9SLan Tianyu } 5423d2123fd9SLan Tianyu } 5424d2123fd9SLan Tianyu 5425d5575424SLan Tianyu #ifdef CONFIG_ACPI 5426d5575424SLan Tianyu /** 5427d5575424SLan Tianyu * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle 5428d5575424SLan Tianyu * @hdev: USB device belonging to the usb hub 5429d5575424SLan Tianyu * @port1: port num of the port 5430d5575424SLan Tianyu * 5431626f090cSYacine Belkadi * Return: Port's acpi handle if successful, %NULL if params are 5432626f090cSYacine Belkadi * invalid. 5433d5575424SLan Tianyu */ 5434d5575424SLan Tianyu acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, 5435d5575424SLan Tianyu int port1) 5436d5575424SLan Tianyu { 5437ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5438d5575424SLan Tianyu 543941341261SMathias Nyman if (!hub) 544041341261SMathias Nyman return NULL; 544141341261SMathias Nyman 5442d5575424SLan Tianyu return DEVICE_ACPI_HANDLE(&hub->ports[port1 - 1]->dev); 5443d5575424SLan Tianyu } 5444d5575424SLan Tianyu #endif 5445