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 4541da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; 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++; 5031da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 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 { 671c2f6595fSAlan Stern return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 6721da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 6731da177e4SLinus Torvalds tt, NULL, 0, 1000); 6741da177e4SLinus Torvalds } 6751da177e4SLinus Torvalds 6761da177e4SLinus Torvalds /* 6771da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 6781da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 6791da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 6801da177e4SLinus Torvalds * both can talk to the same hub concurrently. 6811da177e4SLinus Torvalds */ 682cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 6831da177e4SLinus Torvalds { 684c4028958SDavid Howells struct usb_hub *hub = 685cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 6861da177e4SLinus Torvalds unsigned long flags; 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 6893b6054daSOctavian Purdila while (!list_empty(&hub->tt.clear_list)) { 690d0f830d3SH Hartley Sweeten struct list_head *next; 6911da177e4SLinus Torvalds struct usb_tt_clear *clear; 6921da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 693cb88a1b8SAlan Stern const struct hc_driver *drv; 6941da177e4SLinus Torvalds int status; 6951da177e4SLinus Torvalds 696d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 697d0f830d3SH Hartley Sweeten clear = list_entry (next, struct usb_tt_clear, clear_list); 6981da177e4SLinus Torvalds list_del (&clear->clear_list); 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 7011da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 7021da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 703e9e88fb7SAlan Stern if (status && status != -ENODEV) 7041da177e4SLinus Torvalds dev_err (&hdev->dev, 7051da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 7061da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 707cb88a1b8SAlan Stern 708cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 709cb88a1b8SAlan Stern drv = clear->hcd->driver; 710cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 711cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 712cb88a1b8SAlan Stern 7131da177e4SLinus Torvalds kfree(clear); 714cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 7171da177e4SLinus Torvalds } 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds /** 720971fcd49SLan Tianyu * usb_hub_set_port_power - control hub port's power state 72141341261SMathias Nyman * @hdev: USB device belonging to the usb hub 72241341261SMathias Nyman * @hub: target hub 723971fcd49SLan Tianyu * @port1: port index 724971fcd49SLan Tianyu * @set: expected status 725971fcd49SLan Tianyu * 726971fcd49SLan Tianyu * call this function to control port's power via setting or 727971fcd49SLan Tianyu * clearing the port's PORT_POWER feature. 728971fcd49SLan Tianyu */ 72941341261SMathias Nyman int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, 73041341261SMathias Nyman int port1, bool set) 731971fcd49SLan Tianyu { 732971fcd49SLan Tianyu int ret; 733ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[port1 - 1]; 734971fcd49SLan Tianyu 735971fcd49SLan Tianyu if (set) 736971fcd49SLan Tianyu ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 737971fcd49SLan Tianyu else 738ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 739ad493e5eSLan Tianyu 740ad493e5eSLan Tianyu if (!ret) 741ad493e5eSLan Tianyu port_dev->power_is_on = set; 742971fcd49SLan Tianyu return ret; 743971fcd49SLan Tianyu } 744971fcd49SLan Tianyu 745971fcd49SLan Tianyu /** 746cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 747cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 7481da177e4SLinus Torvalds * 7491da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 7501da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 7511da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 7521da177e4SLinus Torvalds * interrupt context. 7531da177e4SLinus Torvalds * 7541da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 7551da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 7561da177e4SLinus Torvalds */ 757cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 7581da177e4SLinus Torvalds { 759cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 760cb88a1b8SAlan Stern int pipe = urb->pipe; 7611da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 7621da177e4SLinus Torvalds unsigned long flags; 7631da177e4SLinus Torvalds struct usb_tt_clear *clear; 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 7661da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 7671da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 7681da177e4SLinus Torvalds */ 76954e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 7701da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 7711da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 772cb88a1b8SAlan Stern return -ENOMEM; 7731da177e4SLinus Torvalds } 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 7761da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 7771da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 7781da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 7791da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 7801da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 7811da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 7821da177e4SLinus Torvalds if (usb_pipein (pipe)) 7831da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 7841da177e4SLinus Torvalds 785cb88a1b8SAlan Stern /* info for completion callback */ 786cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 787cb88a1b8SAlan Stern clear->ep = urb->ep; 788cb88a1b8SAlan Stern 7891da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 7901da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 7911da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 792cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 7931da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 794cb88a1b8SAlan Stern return 0; 7951da177e4SLinus Torvalds } 796cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 7971da177e4SLinus Torvalds 7988520f380SAlan Stern /* If do_delay is false, return the number of milliseconds the caller 7998520f380SAlan Stern * needs to delay. 8008520f380SAlan Stern */ 8018520f380SAlan Stern static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) 8021da177e4SLinus Torvalds { 8031da177e4SLinus Torvalds int port1; 804b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 8058520f380SAlan Stern unsigned delay; 8064489a571SAlan Stern u16 wHubCharacteristics = 8074489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 8081da177e4SLinus Torvalds 8094489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 8104489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 8114489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 8124489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 8134489a571SAlan Stern * unless we send these messages to the hub. 8144489a571SAlan Stern */ 8154489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 8161da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 8174489a571SAlan Stern else 8184489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 8194489a571SAlan Stern "non-switchable hub\n"); 8201da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 821ad493e5eSLan Tianyu if (hub->ports[port1 - 1]->power_is_on) 8224489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 823ad493e5eSLan Tianyu else 824ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 825ad493e5eSLan Tianyu USB_PORT_FEAT_POWER); 8261da177e4SLinus Torvalds 827b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 8288520f380SAlan Stern delay = max(pgood_delay, (unsigned) 100); 8298520f380SAlan Stern if (do_delay) 8308520f380SAlan Stern msleep(delay); 8318520f380SAlan Stern return delay; 8321da177e4SLinus Torvalds } 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 8351da177e4SLinus Torvalds u16 *status, u16 *change) 8361da177e4SLinus Torvalds { 8371da177e4SLinus Torvalds int ret; 8381da177e4SLinus Torvalds 839db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 8401da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 841e9e88fb7SAlan Stern if (ret < 0) { 842e9e88fb7SAlan Stern if (ret != -ENODEV) 8431da177e4SLinus Torvalds dev_err(hub->intfdev, 844441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 845e9e88fb7SAlan Stern } else { 8461da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 8471da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 8481da177e4SLinus Torvalds ret = 0; 8491da177e4SLinus Torvalds } 850db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 8511da177e4SLinus Torvalds return ret; 8521da177e4SLinus Torvalds } 8531da177e4SLinus Torvalds 85441e7e056SSarah Sharp static int hub_set_port_link_state(struct usb_hub *hub, int port1, 85541e7e056SSarah Sharp unsigned int link_status) 85641e7e056SSarah Sharp { 85741e7e056SSarah Sharp return set_port_feature(hub->hdev, 85841e7e056SSarah Sharp port1 | (link_status << 3), 85941e7e056SSarah Sharp USB_PORT_FEAT_LINK_STATE); 86041e7e056SSarah Sharp } 86141e7e056SSarah Sharp 86241e7e056SSarah Sharp /* 86341e7e056SSarah Sharp * If USB 3.0 ports are placed into the Disabled state, they will no longer 86441e7e056SSarah Sharp * detect any device connects or disconnects. This is generally not what the 86541e7e056SSarah Sharp * USB core wants, since it expects a disabled port to produce a port status 86641e7e056SSarah Sharp * change event when a new device connects. 86741e7e056SSarah Sharp * 86841e7e056SSarah Sharp * Instead, set the link state to Disabled, wait for the link to settle into 86941e7e056SSarah Sharp * that state, clear any change bits, and then put the port into the RxDetect 87041e7e056SSarah Sharp * state. 87141e7e056SSarah Sharp */ 87241e7e056SSarah Sharp static int hub_usb3_port_disable(struct usb_hub *hub, int port1) 87341e7e056SSarah Sharp { 87441e7e056SSarah Sharp int ret; 87541e7e056SSarah Sharp int total_time; 87641e7e056SSarah Sharp u16 portchange, portstatus; 87741e7e056SSarah Sharp 87841e7e056SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 87941e7e056SSarah Sharp return -EINVAL; 88041e7e056SSarah Sharp 88141e7e056SSarah Sharp ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); 882e9e88fb7SAlan Stern if (ret) 88341e7e056SSarah Sharp return ret; 88441e7e056SSarah Sharp 88541e7e056SSarah Sharp /* Wait for the link to enter the disabled state. */ 88641e7e056SSarah Sharp for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 88741e7e056SSarah Sharp ret = hub_port_status(hub, port1, &portstatus, &portchange); 88841e7e056SSarah Sharp if (ret < 0) 88941e7e056SSarah Sharp return ret; 89041e7e056SSarah Sharp 89141e7e056SSarah Sharp if ((portstatus & USB_PORT_STAT_LINK_STATE) == 89241e7e056SSarah Sharp USB_SS_PORT_LS_SS_DISABLED) 89341e7e056SSarah Sharp break; 89441e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 89541e7e056SSarah Sharp break; 89641e7e056SSarah Sharp msleep(HUB_DEBOUNCE_STEP); 89741e7e056SSarah Sharp } 89841e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 89941e7e056SSarah Sharp dev_warn(hub->intfdev, "Could not disable port %d after %d ms\n", 90041e7e056SSarah Sharp port1, total_time); 90141e7e056SSarah Sharp 90241e7e056SSarah Sharp return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); 90341e7e056SSarah Sharp } 90441e7e056SSarah Sharp 9058b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 9068b28c752SAlan Stern { 9078b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 9080458d5b4SAlan Stern int ret = 0; 9098b28c752SAlan Stern 910ff823c79SLan Tianyu if (hub->ports[port1 - 1]->child && set_state) 911ff823c79SLan Tianyu usb_set_device_state(hub->ports[port1 - 1]->child, 9128b28c752SAlan Stern USB_STATE_NOTATTACHED); 91341e7e056SSarah Sharp if (!hub->error) { 91441e7e056SSarah Sharp if (hub_is_superspeed(hub->hdev)) 91541e7e056SSarah Sharp ret = hub_usb3_port_disable(hub, port1); 91641e7e056SSarah Sharp else 917ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, 91841e7e056SSarah Sharp USB_PORT_FEAT_ENABLE); 91941e7e056SSarah Sharp } 920e9e88fb7SAlan Stern if (ret && ret != -ENODEV) 9218b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 9228b28c752SAlan Stern port1, ret); 9238b28c752SAlan Stern return ret; 9248b28c752SAlan Stern } 9258b28c752SAlan Stern 9260458d5b4SAlan Stern /* 9276d42fcdbSJustin P. Mattock * Disable a port and mark a logical connect-change event, so that some 9280458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 9290458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 9300458d5b4SAlan Stern */ 9310458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 9327d069b7dSAlan Stern { 9330458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 9340458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 9350458d5b4SAlan Stern 9360458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 9370458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 9380458d5b4SAlan Stern * - SRP saves power that way 9390458d5b4SAlan Stern * - ... new call, TBD ... 9400458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 9410458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 9420458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 9430458d5b4SAlan Stern */ 9440458d5b4SAlan Stern 9450458d5b4SAlan Stern set_bit(port1, hub->change_bits); 9460458d5b4SAlan Stern kick_khubd(hub); 9470458d5b4SAlan Stern } 9480458d5b4SAlan Stern 949253e0572SAlan Stern /** 950253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 951253e0572SAlan Stern * @udev: device to be disabled and removed 952253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 953253e0572SAlan Stern * 954253e0572SAlan Stern * After @udev's port has been disabled, khubd is notified and it will 955253e0572SAlan Stern * see that the device has been disconnected. When the device is 956253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 957253e0572SAlan Stern * be received and processed normally. 958253e0572SAlan Stern */ 959253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 960253e0572SAlan Stern { 961253e0572SAlan Stern struct usb_hub *hub; 962253e0572SAlan Stern struct usb_interface *intf; 963253e0572SAlan Stern 964253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 965253e0572SAlan Stern return -EINVAL; 966ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 967253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 968253e0572SAlan Stern 969253e0572SAlan Stern usb_autopm_get_interface(intf); 970253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 971253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 972253e0572SAlan Stern usb_autopm_put_interface(intf); 973253e0572SAlan Stern return 0; 974253e0572SAlan Stern } 975253e0572SAlan Stern 9766ee0b270SAlan Stern enum hub_activation_type { 9778e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 9788520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 9796ee0b270SAlan Stern }; 9805e6effaeSAlan Stern 9818520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 9828520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 9838520f380SAlan Stern 984f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 9855e6effaeSAlan Stern { 9865e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 987653a39d1SSarah Sharp struct usb_hcd *hcd; 988653a39d1SSarah Sharp int ret; 9895e6effaeSAlan Stern int port1; 990f2835219SAlan Stern int status; 991948fea37SAlan Stern bool need_debounce_delay = false; 9928520f380SAlan Stern unsigned delay; 9938520f380SAlan Stern 9948520f380SAlan Stern /* Continue a partial initialization */ 9958520f380SAlan Stern if (type == HUB_INIT2) 9968520f380SAlan Stern goto init2; 9978520f380SAlan Stern if (type == HUB_INIT3) 9988520f380SAlan Stern goto init3; 9995e6effaeSAlan Stern 1000a45aa3b3SElric Fu /* The superspeed hub except for root hub has to use Hub Depth 1001a45aa3b3SElric Fu * value as an offset into the route string to locate the bits 1002a45aa3b3SElric Fu * it uses to determine the downstream port number. So hub driver 1003a45aa3b3SElric Fu * should send a set hub depth request to superspeed hub after 1004a45aa3b3SElric Fu * the superspeed hub is set configuration in initialization or 1005a45aa3b3SElric Fu * reset procedure. 1006a45aa3b3SElric Fu * 1007a45aa3b3SElric Fu * After a resume, port power should still be on. 1008f2835219SAlan Stern * For any other type of activation, turn it on. 1009f2835219SAlan Stern */ 10108520f380SAlan Stern if (type != HUB_RESUME) { 1011a45aa3b3SElric Fu if (hdev->parent && hub_is_superspeed(hdev)) { 1012a45aa3b3SElric Fu ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1013a45aa3b3SElric Fu HUB_SET_DEPTH, USB_RT_HUB, 1014a45aa3b3SElric Fu hdev->level - 1, 0, NULL, 0, 1015a45aa3b3SElric Fu USB_CTRL_SET_TIMEOUT); 1016a45aa3b3SElric Fu if (ret < 0) 1017a45aa3b3SElric Fu dev_err(hub->intfdev, 1018a45aa3b3SElric Fu "set hub depth failed\n"); 1019a45aa3b3SElric Fu } 10208520f380SAlan Stern 10218520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 10228520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 10238520f380SAlan Stern * and the implementation looks like a home-brewed sort of 10248520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 10258520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 10268520f380SAlan Stern * rather than as a module). It adds up. 10278520f380SAlan Stern * 10288520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 10298520f380SAlan Stern * because for those activation types the ports have to be 10308520f380SAlan Stern * operational when we return. In theory this could be done 10318520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 10328520f380SAlan Stern */ 10338520f380SAlan Stern if (type == HUB_INIT) { 10348520f380SAlan Stern delay = hub_power_on(hub, false); 10358520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); 10368520f380SAlan Stern schedule_delayed_work(&hub->init_work, 10378520f380SAlan Stern msecs_to_jiffies(delay)); 103861fbeba1SAlan Stern 103961fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 10408e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 10418e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 10428520f380SAlan Stern return; /* Continues at init2: below */ 1043653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 1044653a39d1SSarah Sharp /* The internal host controller state for the hub device 1045653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 1046653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 1047653a39d1SSarah Sharp */ 1048653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1049653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 1050653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1051653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 1052653a39d1SSarah Sharp if (ret < 0) { 1053653a39d1SSarah Sharp dev_err(hub->intfdev, "Host not " 1054653a39d1SSarah Sharp "accepting hub info " 1055653a39d1SSarah Sharp "update.\n"); 1056653a39d1SSarah Sharp dev_err(hub->intfdev, "LS/FS devices " 1057653a39d1SSarah Sharp "and hubs may not work " 1058653a39d1SSarah Sharp "under this hub\n."); 1059653a39d1SSarah Sharp } 1060653a39d1SSarah Sharp } 1061653a39d1SSarah Sharp hub_power_on(hub, true); 10628520f380SAlan Stern } else { 10638520f380SAlan Stern hub_power_on(hub, true); 10648520f380SAlan Stern } 10658520f380SAlan Stern } 10668520f380SAlan Stern init2: 1067f2835219SAlan Stern 10686ee0b270SAlan Stern /* Check each port and set hub->change_bits to let khubd know 10696ee0b270SAlan Stern * which ports need attention. 10705e6effaeSAlan Stern */ 10715e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 1072ff823c79SLan Tianyu struct usb_device *udev = hub->ports[port1 - 1]->child; 10735e6effaeSAlan Stern u16 portstatus, portchange; 10745e6effaeSAlan Stern 10756ee0b270SAlan Stern portstatus = portchange = 0; 10766ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 10776ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 10786ee0b270SAlan Stern dev_dbg(hub->intfdev, 10796ee0b270SAlan Stern "port %d: status %04x change %04x\n", 10806ee0b270SAlan Stern port1, portstatus, portchange); 10815e6effaeSAlan Stern 10826ee0b270SAlan Stern /* After anything other than HUB_RESUME (i.e., initialization 10836ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 10846ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 10856ee0b270SAlan Stern * and so should ports for which we have no usb_device. 10865e6effaeSAlan Stern */ 10876ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 10886ee0b270SAlan Stern type != HUB_RESUME || 10896ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 10906ee0b270SAlan Stern !udev || 10916ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 10929f0a6cd3SAndiry Xu /* 10939f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 10949f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 10959f0a6cd3SAndiry Xu * Do not disable USB3 protocol ports. 10969f0a6cd3SAndiry Xu */ 1097131dec34SSarah Sharp if (!hub_is_superspeed(hdev)) { 1098ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port1, 10999f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 11006ee0b270SAlan Stern portstatus &= ~USB_PORT_STAT_ENABLE; 110185f0ff46SSarah Sharp } else { 110285f0ff46SSarah Sharp /* Pretend that power was lost for USB3 devs */ 110385f0ff46SSarah Sharp portstatus &= ~USB_PORT_STAT_ENABLE; 11046ee0b270SAlan Stern } 11059f0a6cd3SAndiry Xu } 11066ee0b270SAlan Stern 1107948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 1108948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 1109948fea37SAlan Stern need_debounce_delay = true; 1110ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1111948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 1112948fea37SAlan Stern } 1113948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 1114948fea37SAlan Stern need_debounce_delay = true; 1115ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1116948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 1117948fea37SAlan Stern } 111879c3dd81SDon Zickus if ((portchange & USB_PORT_STAT_C_BH_RESET) && 111979c3dd81SDon Zickus hub_is_superspeed(hub->hdev)) { 112079c3dd81SDon Zickus need_debounce_delay = true; 1121ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 112279c3dd81SDon Zickus USB_PORT_FEAT_C_BH_PORT_RESET); 112379c3dd81SDon Zickus } 1124253e0572SAlan Stern /* We can forget about a "removed" device when there's a 1125253e0572SAlan Stern * physical disconnect or the connect status changes. 1126253e0572SAlan Stern */ 1127253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 1128253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 1129253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 1130253e0572SAlan Stern 11316ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 11326ee0b270SAlan Stern /* Tell khubd to disconnect the device or 11336ee0b270SAlan Stern * check for a new connection 11346ee0b270SAlan Stern */ 11356ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 11366ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11376ee0b270SAlan Stern 11386ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 113972937e1eSSarah Sharp bool port_resumed = (portstatus & 114072937e1eSSarah Sharp USB_PORT_STAT_LINK_STATE) == 114172937e1eSSarah Sharp USB_SS_PORT_LS_U0; 11426ee0b270SAlan Stern /* The power session apparently survived the resume. 11436ee0b270SAlan Stern * If there was an overcurrent or suspend change 11446ee0b270SAlan Stern * (i.e., remote wakeup request), have khubd 114572937e1eSSarah Sharp * take care of it. Look at the port link state 114672937e1eSSarah Sharp * for USB 3.0 hubs, since they don't have a suspend 114772937e1eSSarah Sharp * change bit, and they don't set the port link change 114872937e1eSSarah Sharp * bit on device-initiated resume. 11496ee0b270SAlan Stern */ 115072937e1eSSarah Sharp if (portchange || (hub_is_superspeed(hub->hdev) && 115172937e1eSSarah Sharp port_resumed)) 11526ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11536ee0b270SAlan Stern 11546ee0b270SAlan Stern } else if (udev->persist_enabled) { 1155ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[port1 - 1]; 1156ad493e5eSLan Tianyu 11576ee0b270SAlan Stern #ifdef CONFIG_PM 11585e6effaeSAlan Stern udev->reset_resume = 1; 11596ee0b270SAlan Stern #endif 1160ad493e5eSLan Tianyu /* Don't set the change_bits when the device 1161ad493e5eSLan Tianyu * was powered off. 1162ad493e5eSLan Tianyu */ 1163ad493e5eSLan Tianyu if (port_dev->power_is_on) 11648808f00cSAlan Stern set_bit(port1, hub->change_bits); 11658808f00cSAlan Stern 11666ee0b270SAlan Stern } else { 11676ee0b270SAlan Stern /* The power session is gone; tell khubd */ 11686ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11696ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11705e6effaeSAlan Stern } 11715e6effaeSAlan Stern } 11725e6effaeSAlan Stern 1173948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 1174948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 1175948fea37SAlan Stern * ports all at once right now, instead of letting khubd do them 1176948fea37SAlan Stern * one at a time later on. 1177948fea37SAlan Stern * 1178948fea37SAlan Stern * If any port-status changes do occur during this delay, khubd 1179948fea37SAlan Stern * will see them later and handle them normally. 1180948fea37SAlan Stern */ 11818520f380SAlan Stern if (need_debounce_delay) { 11828520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 1183f2835219SAlan Stern 11848520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 11858520f380SAlan Stern if (type == HUB_INIT2) { 11868520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); 11878520f380SAlan Stern schedule_delayed_work(&hub->init_work, 11888520f380SAlan Stern msecs_to_jiffies(delay)); 11898520f380SAlan Stern return; /* Continues at init3: below */ 11908520f380SAlan Stern } else { 11918520f380SAlan Stern msleep(delay); 11928520f380SAlan Stern } 11938520f380SAlan Stern } 11948520f380SAlan Stern init3: 1195f2835219SAlan Stern hub->quiescing = 0; 1196f2835219SAlan Stern 1197f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 1198f2835219SAlan Stern if (status < 0) 1199f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 1200f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 1201f2835219SAlan Stern schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 1202f2835219SAlan Stern 1203f2835219SAlan Stern /* Scan all ports that need attention */ 1204f2835219SAlan Stern kick_khubd(hub); 12058e4ceb38SAlan Stern 12068e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 12078e4ceb38SAlan Stern if (type <= HUB_INIT3) 12088e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 12095e6effaeSAlan Stern } 12105e6effaeSAlan Stern 12118520f380SAlan Stern /* Implement the continuations for the delays above */ 12128520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 12138520f380SAlan Stern { 12148520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12158520f380SAlan Stern 12168520f380SAlan Stern hub_activate(hub, HUB_INIT2); 12178520f380SAlan Stern } 12188520f380SAlan Stern 12198520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 12208520f380SAlan Stern { 12218520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12228520f380SAlan Stern 12238520f380SAlan Stern hub_activate(hub, HUB_INIT3); 12248520f380SAlan Stern } 12258520f380SAlan Stern 12264330354fSAlan Stern enum hub_quiescing_type { 12274330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 12284330354fSAlan Stern }; 12294330354fSAlan Stern 12304330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 12314330354fSAlan Stern { 12324330354fSAlan Stern struct usb_device *hdev = hub->hdev; 12334330354fSAlan Stern int i; 12344330354fSAlan Stern 12358520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 12368520f380SAlan Stern 12374330354fSAlan Stern /* khubd and related activity won't re-trigger */ 12384330354fSAlan Stern hub->quiescing = 1; 12394330354fSAlan Stern 12404330354fSAlan Stern if (type != HUB_SUSPEND) { 12414330354fSAlan Stern /* Disconnect all the children */ 12424330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 1243ff823c79SLan Tianyu if (hub->ports[i]->child) 1244ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 12454330354fSAlan Stern } 12464330354fSAlan Stern } 12474330354fSAlan Stern 12484330354fSAlan Stern /* Stop khubd and related activity */ 12494330354fSAlan Stern usb_kill_urb(hub->urb); 12504330354fSAlan Stern if (hub->has_indicators) 12514330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 12524330354fSAlan Stern if (hub->tt.hub) 1253036546bfSOctavian Purdila flush_work(&hub->tt.clear_work); 12544330354fSAlan Stern } 12554330354fSAlan Stern 12563eb14915SAlan Stern /* caller has locked the hub device */ 12573eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 12583eb14915SAlan Stern { 12593eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12603eb14915SAlan Stern 12614330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 1262f07600cfSAlan Stern return 0; 12637d069b7dSAlan Stern } 12647d069b7dSAlan Stern 12657d069b7dSAlan Stern /* caller has locked the hub device */ 1266f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 12677d069b7dSAlan Stern { 12687de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12697de18d8bSAlan Stern 1270f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 1271f07600cfSAlan Stern return 0; 12727d069b7dSAlan Stern } 12737d069b7dSAlan Stern 12741da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 12751da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 12761da177e4SLinus Torvalds { 1277b356b7c7SSarah Sharp struct usb_hcd *hcd; 12781da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 12791da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 12801da177e4SLinus Torvalds u16 hubstatus, hubchange; 128174ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 12821da177e4SLinus Torvalds unsigned int pipe; 1283fa2a9566SLan Tianyu int maxp, ret, i; 12847cbe5dcaSAlan Stern char *message = "out of memory"; 1285430ee58eSSebastian Andrzej Siewior unsigned unit_load; 1286430ee58eSSebastian Andrzej Siewior unsigned full_load; 12871da177e4SLinus Torvalds 1288d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 12891da177e4SLinus Torvalds if (!hub->buffer) { 12901da177e4SLinus Torvalds ret = -ENOMEM; 12911da177e4SLinus Torvalds goto fail; 12921da177e4SLinus Torvalds } 12931da177e4SLinus Torvalds 12941da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 12951da177e4SLinus Torvalds if (!hub->status) { 12961da177e4SLinus Torvalds ret = -ENOMEM; 12971da177e4SLinus Torvalds goto fail; 12981da177e4SLinus Torvalds } 1299db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 13001da177e4SLinus Torvalds 13011da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 13021da177e4SLinus Torvalds if (!hub->descriptor) { 13031da177e4SLinus Torvalds ret = -ENOMEM; 13041da177e4SLinus Torvalds goto fail; 13051da177e4SLinus Torvalds } 13061da177e4SLinus Torvalds 13071da177e4SLinus Torvalds /* Request the entire hub descriptor. 13081da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 13091da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 13101da177e4SLinus Torvalds */ 1311dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 13121da177e4SLinus Torvalds if (ret < 0) { 13131da177e4SLinus Torvalds message = "can't read hub descriptor"; 13141da177e4SLinus Torvalds goto fail; 13151da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 13161da177e4SLinus Torvalds message = "hub has too many ports!"; 13171da177e4SLinus Torvalds ret = -ENODEV; 13181da177e4SLinus Torvalds goto fail; 1319769d7368SDavid Linares } else if (hub->descriptor->bNbrPorts == 0) { 1320769d7368SDavid Linares message = "hub doesn't have any ports!"; 1321769d7368SDavid Linares ret = -ENODEV; 1322769d7368SDavid Linares goto fail; 13231da177e4SLinus Torvalds } 13241da177e4SLinus Torvalds 13251da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 13261da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 13271da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 13281da177e4SLinus Torvalds 1329fa2a9566SLan Tianyu hub->ports = kzalloc(hdev->maxchild * sizeof(struct usb_port *), 1330336c5c31SLan Tianyu GFP_KERNEL); 1331ff823c79SLan Tianyu if (!hub->ports) { 13327cbe5dcaSAlan Stern ret = -ENOMEM; 13337cbe5dcaSAlan Stern goto fail; 13347cbe5dcaSAlan Stern } 13357cbe5dcaSAlan Stern 133674ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 1337430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hdev)) { 1338430ee58eSSebastian Andrzej Siewior unit_load = 150; 1339430ee58eSSebastian Andrzej Siewior full_load = 900; 1340430ee58eSSebastian Andrzej Siewior } else { 1341430ee58eSSebastian Andrzej Siewior unit_load = 100; 1342430ee58eSSebastian Andrzej Siewior full_load = 500; 1343430ee58eSSebastian Andrzej Siewior } 13441da177e4SLinus Torvalds 1345dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1346dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1347dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 13481da177e4SLinus Torvalds int i; 13491da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 13501da177e4SLinus Torvalds 13511da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 1352dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 13531da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 13541da177e4SLinus Torvalds ? 'F' : 'R'; 13551da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 13561da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 13571da177e4SLinus Torvalds } else 13581da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 13591da177e4SLinus Torvalds 136074ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 13617bf01185SAman Deep case HUB_CHAR_COMMON_LPSM: 13621da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 13631da177e4SLinus Torvalds break; 13647bf01185SAman Deep case HUB_CHAR_INDV_PORT_LPSM: 13651da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 13661da177e4SLinus Torvalds break; 13677bf01185SAman Deep case HUB_CHAR_NO_LPSM: 13687bf01185SAman Deep case HUB_CHAR_LPSM: 13691da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 13701da177e4SLinus Torvalds break; 13711da177e4SLinus Torvalds } 13721da177e4SLinus Torvalds 137374ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 13747bf01185SAman Deep case HUB_CHAR_COMMON_OCPM: 13751da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 13761da177e4SLinus Torvalds break; 13777bf01185SAman Deep case HUB_CHAR_INDV_PORT_OCPM: 13781da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 13791da177e4SLinus Torvalds break; 13807bf01185SAman Deep case HUB_CHAR_NO_OCPM: 13817bf01185SAman Deep case HUB_CHAR_OCPM: 13821da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 13831da177e4SLinus Torvalds break; 13841da177e4SLinus Torvalds } 13851da177e4SLinus Torvalds 13861da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 13871da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 1388cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 13891da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 13907bf01185SAman Deep case USB_HUB_PR_FS: 13911da177e4SLinus Torvalds break; 13927bf01185SAman Deep case USB_HUB_PR_HS_SINGLE_TT: 13931da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 13941da177e4SLinus Torvalds hub->tt.hub = hdev; 13951da177e4SLinus Torvalds break; 13967bf01185SAman Deep case USB_HUB_PR_HS_MULTI_TT: 13971da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 13981da177e4SLinus Torvalds if (ret == 0) { 13991da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 14001da177e4SLinus Torvalds hub->tt.multi = 1; 14011da177e4SLinus Torvalds } else 14021da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 14031da177e4SLinus Torvalds ret); 14041da177e4SLinus Torvalds hub->tt.hub = hdev; 14051da177e4SLinus Torvalds break; 14067bf01185SAman Deep case USB_HUB_PR_SS: 1407d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1408d2e9b4d6SSarah Sharp break; 14091da177e4SLinus Torvalds default: 14101da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 14111da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 14121da177e4SLinus Torvalds break; 14131da177e4SLinus Torvalds } 14141da177e4SLinus Torvalds 1415e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 141674ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1417e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1418e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1419e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1420e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1421e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1422e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1423e09711aeSdavid-b@pacbell.net } 14241da177e4SLinus Torvalds break; 1425e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1426e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1427e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1428e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1429e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 14301da177e4SLinus Torvalds break; 1431e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1432e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1433e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1434e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1435e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 14361da177e4SLinus Torvalds break; 1437e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1438e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1439e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1440e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1441e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 14421da177e4SLinus Torvalds break; 14431da177e4SLinus Torvalds } 14441da177e4SLinus Torvalds 14451da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 144674ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 14471da177e4SLinus Torvalds hub->has_indicators = 1; 14481da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 14491da177e4SLinus Torvalds } 14501da177e4SLinus Torvalds 14511da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 14521da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 14531da177e4SLinus Torvalds 14541da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 14551da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 14561da177e4SLinus Torvalds */ 14571da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 145855c52718SAlan Stern if (ret < 2) { 14591da177e4SLinus Torvalds message = "can't get hub status"; 14601da177e4SLinus Torvalds goto fail; 14611da177e4SLinus Torvalds } 14627d35b929SAlan Stern le16_to_cpus(&hubstatus); 1463430ee58eSSebastian Andrzej Siewior hcd = bus_to_hcd(hdev->bus); 14647d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 1465430ee58eSSebastian Andrzej Siewior if (hcd->power_budget > 0) 1466430ee58eSSebastian Andrzej Siewior hdev->bus_mA = hcd->power_budget; 1467430ee58eSSebastian Andrzej Siewior else 1468430ee58eSSebastian Andrzej Siewior hdev->bus_mA = full_load * hdev->maxchild; 1469430ee58eSSebastian Andrzej Siewior if (hdev->bus_mA >= full_load) 1470430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 147155c52718SAlan Stern else { 147255c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 147355c52718SAlan Stern hub->limited_power = 1; 147455c52718SAlan Stern } 14757d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 147655c52718SAlan Stern int remaining = hdev->bus_mA - 147755c52718SAlan Stern hub->descriptor->bHubContrCurrent; 14781da177e4SLinus Torvalds 1479430ee58eSSebastian Andrzej Siewior dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 1480430ee58eSSebastian Andrzej Siewior hub->descriptor->bHubContrCurrent); 1481430ee58eSSebastian Andrzej Siewior hub->limited_power = 1; 1482430ee58eSSebastian Andrzej Siewior 1483430ee58eSSebastian Andrzej Siewior if (remaining < hdev->maxchild * unit_load) 148455c52718SAlan Stern dev_warn(hub_dev, 148555c52718SAlan Stern "insufficient power available " 148655c52718SAlan Stern "to use all downstream ports\n"); 1487430ee58eSSebastian Andrzej Siewior hub->mA_per_port = unit_load; /* 7.2.1 */ 1488430ee58eSSebastian Andrzej Siewior 148955c52718SAlan Stern } else { /* Self-powered external hub */ 149055c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 149155c52718SAlan Stern * provide less current per port? */ 1492430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 149355c52718SAlan Stern } 1494430ee58eSSebastian Andrzej Siewior if (hub->mA_per_port < full_load) 149555c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 149655c52718SAlan Stern hub->mA_per_port); 14971da177e4SLinus Torvalds 1498b356b7c7SSarah Sharp /* Update the HCD's internal representation of this hub before khubd 1499b356b7c7SSarah Sharp * starts getting port status changes for devices under the hub. 1500b356b7c7SSarah Sharp */ 1501b356b7c7SSarah Sharp if (hcd->driver->update_hub_device) { 1502b356b7c7SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1503b356b7c7SSarah Sharp &hub->tt, GFP_KERNEL); 1504b356b7c7SSarah Sharp if (ret < 0) { 1505b356b7c7SSarah Sharp message = "can't update HCD hub info"; 1506b356b7c7SSarah Sharp goto fail; 1507b356b7c7SSarah Sharp } 1508b356b7c7SSarah Sharp } 1509b356b7c7SSarah Sharp 15101da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 15111da177e4SLinus Torvalds if (ret < 0) { 15121da177e4SLinus Torvalds message = "can't get hub status"; 15131da177e4SLinus Torvalds goto fail; 15141da177e4SLinus Torvalds } 15151da177e4SLinus Torvalds 15161da177e4SLinus Torvalds /* local power status reports aren't always correct */ 15171da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 15181da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 15191da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 15201da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 15211da177e4SLinus Torvalds 152274ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 15231da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 15241da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 15251da177e4SLinus Torvalds 152688fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 152788fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 152888fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 152988fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 153088fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 153188fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 15321da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 15331da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 15341da177e4SLinus Torvalds 15351da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 15361da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 15371da177e4SLinus Torvalds 15381da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 15391da177e4SLinus Torvalds if (!hub->urb) { 15401da177e4SLinus Torvalds ret = -ENOMEM; 15411da177e4SLinus Torvalds goto fail; 15421da177e4SLinus Torvalds } 15431da177e4SLinus Torvalds 15441da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 15451da177e4SLinus Torvalds hub, endpoint->bInterval); 15461da177e4SLinus Torvalds 15471da177e4SLinus Torvalds /* maybe cycle the hub leds */ 15481da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 15491da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 15501da177e4SLinus Torvalds 1551fa2a9566SLan Tianyu for (i = 0; i < hdev->maxchild; i++) 1552fa2a9566SLan Tianyu if (usb_hub_create_port_device(hub, i + 1) < 0) 1553fa2a9566SLan Tianyu dev_err(hub->intfdev, 1554fa2a9566SLan Tianyu "couldn't create port%d device.\n", i + 1); 1555fa2a9566SLan Tianyu 1556d2123fd9SLan Tianyu usb_hub_adjust_deviceremovable(hdev, hub->descriptor); 1557d2123fd9SLan Tianyu 1558f2835219SAlan Stern hub_activate(hub, HUB_INIT); 15591da177e4SLinus Torvalds return 0; 15601da177e4SLinus Torvalds 15611da177e4SLinus Torvalds fail: 15621da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 15631da177e4SLinus Torvalds message, ret); 15641da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 15651da177e4SLinus Torvalds return ret; 15661da177e4SLinus Torvalds } 15671da177e4SLinus Torvalds 1568e8054854SAlan Stern static void hub_release(struct kref *kref) 1569e8054854SAlan Stern { 1570e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1571e8054854SAlan Stern 1572e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1573e8054854SAlan Stern kfree(hub); 1574e8054854SAlan Stern } 1575e8054854SAlan Stern 15761da177e4SLinus Torvalds static unsigned highspeed_hubs; 15771da177e4SLinus Torvalds 15781da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 15791da177e4SLinus Torvalds { 15801da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 1581fa286188SGreg Kroah-Hartman struct usb_device *hdev = interface_to_usbdev(intf); 1582fa2a9566SLan Tianyu int i; 1583fa2a9566SLan Tianyu 1584e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 1585e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 15868e4ceb38SAlan Stern if (!list_empty(&hub->event_list)) { 1587e8054854SAlan Stern list_del_init(&hub->event_list); 15888e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 15898e4ceb38SAlan Stern } 1590e8054854SAlan Stern hub->disconnected = 1; 1591e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 15921da177e4SLinus Torvalds 15937de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 15947de18d8bSAlan Stern hub->error = 0; 15954330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 15967de18d8bSAlan Stern 15978b28c752SAlan Stern usb_set_intfdata (intf, NULL); 15981f2235b8SAlexander Shishkin 15991f2235b8SAlexander Shishkin for (i = 0; i < hdev->maxchild; i++) 16001f2235b8SAlexander Shishkin usb_hub_remove_port_device(hub, i + 1); 16017cbe5dcaSAlan Stern hub->hdev->maxchild = 0; 16021da177e4SLinus Torvalds 1603e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 16041da177e4SLinus Torvalds highspeed_hubs--; 16051da177e4SLinus Torvalds 16061da177e4SLinus Torvalds usb_free_urb(hub->urb); 1607fa2a9566SLan Tianyu kfree(hub->ports); 16081da177e4SLinus Torvalds kfree(hub->descriptor); 16091da177e4SLinus Torvalds kfree(hub->status); 1610d697cddaSAlan Stern kfree(hub->buffer); 16111da177e4SLinus Torvalds 1612971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, false); 1613e8054854SAlan Stern kref_put(&hub->kref, hub_release); 16141da177e4SLinus Torvalds } 16151da177e4SLinus Torvalds 16161da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 16171da177e4SLinus Torvalds { 16181da177e4SLinus Torvalds struct usb_host_interface *desc; 16191da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 16201da177e4SLinus Torvalds struct usb_device *hdev; 16211da177e4SLinus Torvalds struct usb_hub *hub; 16221da177e4SLinus Torvalds 16231da177e4SLinus Torvalds desc = intf->cur_altsetting; 16241da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 16251da177e4SLinus Torvalds 1626596d789aSMing Lei /* 1627596d789aSMing Lei * Set default autosuspend delay as 0 to speedup bus suspend, 1628596d789aSMing Lei * based on the below considerations: 1629596d789aSMing Lei * 1630596d789aSMing Lei * - Unlike other drivers, the hub driver does not rely on the 1631596d789aSMing Lei * autosuspend delay to provide enough time to handle a wakeup 1632596d789aSMing Lei * event, and the submitted status URB is just to check future 1633596d789aSMing Lei * change on hub downstream ports, so it is safe to do it. 1634596d789aSMing Lei * 1635596d789aSMing Lei * - The patch might cause one or more auto supend/resume for 1636596d789aSMing Lei * below very rare devices when they are plugged into hub 1637596d789aSMing Lei * first time: 1638596d789aSMing Lei * 1639596d789aSMing Lei * devices having trouble initializing, and disconnect 1640596d789aSMing Lei * themselves from the bus and then reconnect a second 1641596d789aSMing Lei * or so later 1642596d789aSMing Lei * 1643596d789aSMing Lei * devices just for downloading firmware, and disconnects 1644596d789aSMing Lei * themselves after completing it 1645596d789aSMing Lei * 1646596d789aSMing Lei * For these quite rare devices, their drivers may change the 1647596d789aSMing Lei * autosuspend delay of their parent hub in the probe() to one 1648596d789aSMing Lei * appropriate value to avoid the subtle problem if someone 1649596d789aSMing Lei * does care it. 1650596d789aSMing Lei * 1651596d789aSMing Lei * - The patch may cause one or more auto suspend/resume on 1652596d789aSMing Lei * hub during running 'lsusb', but it is probably too 1653596d789aSMing Lei * infrequent to worry about. 1654596d789aSMing Lei * 1655596d789aSMing Lei * - Change autosuspend delay of hub can avoid unnecessary auto 1656596d789aSMing Lei * suspend timer for hub, also may decrease power consumption 1657596d789aSMing Lei * of USB bus. 1658596d789aSMing Lei */ 1659596d789aSMing Lei pm_runtime_set_autosuspend_delay(&hdev->dev, 0); 1660596d789aSMing Lei 16612839f5bcSSarah Sharp /* Hubs have proper suspend/resume support. */ 1662088f7fecSAlan Stern usb_enable_autosuspend(hdev); 1663088f7fecSAlan Stern 166438f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1665b9cef6c3SWu Fengguang dev_err(&intf->dev, 1666b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 166738f3ad5eSFelipe Balbi return -E2BIG; 166838f3ad5eSFelipe Balbi } 166938f3ad5eSFelipe Balbi 167089ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 167189ccbdc9SDavid Brownell if (hdev->parent) { 167289ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 167389ccbdc9SDavid Brownell return -ENODEV; 167489ccbdc9SDavid Brownell } 167589ccbdc9SDavid Brownell #endif 167689ccbdc9SDavid Brownell 16771da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 16781da177e4SLinus Torvalds /* specs is not defined, but it works */ 16791da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 16801da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 16811da177e4SLinus Torvalds descriptor_error: 16821da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 16831da177e4SLinus Torvalds return -EIO; 16841da177e4SLinus Torvalds } 16851da177e4SLinus Torvalds 16861da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 16871da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 16881da177e4SLinus Torvalds goto descriptor_error; 16891da177e4SLinus Torvalds 16901da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 16911da177e4SLinus Torvalds 1692fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1693fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 16941da177e4SLinus Torvalds goto descriptor_error; 16951da177e4SLinus Torvalds 16961da177e4SLinus Torvalds /* We found a hub */ 16971da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 16981da177e4SLinus Torvalds 16990a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 17001da177e4SLinus Torvalds if (!hub) { 17011da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 17021da177e4SLinus Torvalds return -ENOMEM; 17031da177e4SLinus Torvalds } 17041da177e4SLinus Torvalds 1705e8054854SAlan Stern kref_init(&hub->kref); 17061da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 17071da177e4SLinus Torvalds hub->intfdev = &intf->dev; 17081da177e4SLinus Torvalds hub->hdev = hdev; 1709c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 17108520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 1711e8054854SAlan Stern usb_get_intf(intf); 17121da177e4SLinus Torvalds 17131da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 171440f122f3SAlan Stern intf->needs_remote_wakeup = 1; 1715971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, true); 17161da177e4SLinus Torvalds 17171da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 17181da177e4SLinus Torvalds highspeed_hubs++; 17191da177e4SLinus Torvalds 1720e6f30deaSMing Lei if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) 1721e6f30deaSMing Lei hub->quirk_check_port_auto_suspend = 1; 1722e6f30deaSMing Lei 17231da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 17241da177e4SLinus Torvalds return 0; 17251da177e4SLinus Torvalds 17261da177e4SLinus Torvalds hub_disconnect (intf); 17271da177e4SLinus Torvalds return -ENODEV; 17281da177e4SLinus Torvalds } 17291da177e4SLinus Torvalds 17301da177e4SLinus Torvalds static int 17311da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 17321da177e4SLinus Torvalds { 17331da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 1734ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 17351da177e4SLinus Torvalds 17361da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 17371da177e4SLinus Torvalds switch (code) { 17381da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 17391da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 17401da177e4SLinus Torvalds int i; 17411da177e4SLinus Torvalds 17421da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 17431da177e4SLinus Torvalds if (hdev->devnum <= 0) 17441da177e4SLinus Torvalds info->nports = 0; 17451da177e4SLinus Torvalds else { 17461da177e4SLinus Torvalds info->nports = hdev->maxchild; 17471da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 1748ff823c79SLan Tianyu if (hub->ports[i]->child == NULL) 17491da177e4SLinus Torvalds info->port[i] = 0; 17501da177e4SLinus Torvalds else 17511da177e4SLinus Torvalds info->port[i] = 1752ff823c79SLan Tianyu hub->ports[i]->child->devnum; 17531da177e4SLinus Torvalds } 17541da177e4SLinus Torvalds } 17551da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 17561da177e4SLinus Torvalds 17571da177e4SLinus Torvalds return info->nports + 1; 17581da177e4SLinus Torvalds } 17591da177e4SLinus Torvalds 17601da177e4SLinus Torvalds default: 17611da177e4SLinus Torvalds return -ENOSYS; 17621da177e4SLinus Torvalds } 17631da177e4SLinus Torvalds } 17641da177e4SLinus Torvalds 17657cbe5dcaSAlan Stern /* 17667cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 17677cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 17687cbe5dcaSAlan Stern */ 17697cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 1770336c5c31SLan Tianyu struct dev_state ***ppowner) 17717cbe5dcaSAlan Stern { 177241341261SMathias Nyman struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 177341341261SMathias Nyman 17747cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 17757cbe5dcaSAlan Stern return -ENODEV; 17767cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 17777cbe5dcaSAlan Stern return -EINVAL; 17787cbe5dcaSAlan Stern 177941341261SMathias Nyman /* Devices not managed by the hub driver 17807cbe5dcaSAlan Stern * will always have maxchild equal to 0. 17817cbe5dcaSAlan Stern */ 178241341261SMathias Nyman *ppowner = &(hub->ports[port1 - 1]->port_owner); 17837cbe5dcaSAlan Stern return 0; 17847cbe5dcaSAlan Stern } 17857cbe5dcaSAlan Stern 17867cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 1787336c5c31SLan Tianyu int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, 1788336c5c31SLan Tianyu struct dev_state *owner) 17897cbe5dcaSAlan Stern { 17907cbe5dcaSAlan Stern int rc; 1791336c5c31SLan Tianyu struct dev_state **powner; 17927cbe5dcaSAlan Stern 17937cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 17947cbe5dcaSAlan Stern if (rc) 17957cbe5dcaSAlan Stern return rc; 17967cbe5dcaSAlan Stern if (*powner) 17977cbe5dcaSAlan Stern return -EBUSY; 17987cbe5dcaSAlan Stern *powner = owner; 17997cbe5dcaSAlan Stern return rc; 18007cbe5dcaSAlan Stern } 18017cbe5dcaSAlan Stern 1802336c5c31SLan Tianyu int usb_hub_release_port(struct usb_device *hdev, unsigned port1, 1803336c5c31SLan Tianyu struct dev_state *owner) 18047cbe5dcaSAlan Stern { 18057cbe5dcaSAlan Stern int rc; 1806336c5c31SLan Tianyu struct dev_state **powner; 18077cbe5dcaSAlan Stern 18087cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18097cbe5dcaSAlan Stern if (rc) 18107cbe5dcaSAlan Stern return rc; 18117cbe5dcaSAlan Stern if (*powner != owner) 18127cbe5dcaSAlan Stern return -ENOENT; 18137cbe5dcaSAlan Stern *powner = NULL; 18147cbe5dcaSAlan Stern return rc; 18157cbe5dcaSAlan Stern } 18167cbe5dcaSAlan Stern 1817336c5c31SLan Tianyu void usb_hub_release_all_ports(struct usb_device *hdev, struct dev_state *owner) 18187cbe5dcaSAlan Stern { 1819ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 18207cbe5dcaSAlan Stern int n; 18217cbe5dcaSAlan Stern 1822fa2a9566SLan Tianyu for (n = 0; n < hdev->maxchild; n++) { 1823fa2a9566SLan Tianyu if (hub->ports[n]->port_owner == owner) 1824fa2a9566SLan Tianyu hub->ports[n]->port_owner = NULL; 18257cbe5dcaSAlan Stern } 1826fa2a9566SLan Tianyu 18277cbe5dcaSAlan Stern } 18287cbe5dcaSAlan Stern 18297cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 18307cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 18317cbe5dcaSAlan Stern { 18327cbe5dcaSAlan Stern struct usb_hub *hub; 18337cbe5dcaSAlan Stern 18347cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 18357cbe5dcaSAlan Stern return false; 1836ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 1837fa2a9566SLan Tianyu return !!hub->ports[udev->portnum - 1]->port_owner; 18387cbe5dcaSAlan Stern } 18397cbe5dcaSAlan Stern 18401da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 18411da177e4SLinus Torvalds { 1842ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 18431da177e4SLinus Torvalds int i; 18441da177e4SLinus Torvalds 18451da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 1846ff823c79SLan Tianyu if (hub->ports[i]->child) 1847ff823c79SLan Tianyu recursively_mark_NOTATTACHED(hub->ports[i]->child); 18481da177e4SLinus Torvalds } 18499bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 185015123006SSarah Sharp udev->active_duration -= jiffies; 18511da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 18521da177e4SLinus Torvalds } 18531da177e4SLinus Torvalds 18541da177e4SLinus Torvalds /** 18551da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 18561da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 18571da177e4SLinus Torvalds * @new_state: new state value to be stored 18581da177e4SLinus Torvalds * 18591da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 18601da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 18611da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 18621da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 18631da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 18641da177e4SLinus Torvalds * all changes to any device's state must be protected by the 18651da177e4SLinus Torvalds * device_state_lock spinlock. 18661da177e4SLinus Torvalds * 18671da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 18681da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 18691da177e4SLinus Torvalds * 18701da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 18711da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 18721da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 18731da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 18741da177e4SLinus Torvalds */ 18751da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 18761da177e4SLinus Torvalds enum usb_device_state new_state) 18771da177e4SLinus Torvalds { 18781da177e4SLinus Torvalds unsigned long flags; 18794681b171SRafael J. Wysocki int wakeup = -1; 18801da177e4SLinus Torvalds 18811da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 18821da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 18831da177e4SLinus Torvalds ; /* do nothing */ 1884b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1885fb669cc0SDavid Brownell 1886fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1887fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1888fb669cc0SDavid Brownell */ 1889fb669cc0SDavid Brownell if (udev->parent) { 1890645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1891645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1892645daaabSAlan Stern ; /* No change to wakeup settings */ 1893645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 18944681b171SRafael J. Wysocki wakeup = udev->actconfig->desc.bmAttributes 18954681b171SRafael J. Wysocki & USB_CONFIG_ATT_WAKEUP; 1896645daaabSAlan Stern else 18974681b171SRafael J. Wysocki wakeup = 0; 1898fb669cc0SDavid Brownell } 189915123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 190015123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 190115123006SSarah Sharp udev->active_duration -= jiffies; 190215123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 190315123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 190415123006SSarah Sharp udev->active_duration += jiffies; 1905645daaabSAlan Stern udev->state = new_state; 1906b94dc6b5SDavid Brownell } else 19071da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 19081da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 19094681b171SRafael J. Wysocki if (wakeup >= 0) 19104681b171SRafael J. Wysocki device_set_wakeup_capable(&udev->dev, wakeup); 19111da177e4SLinus Torvalds } 19126da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 19131da177e4SLinus Torvalds 19148af548dcSInaky Perez-Gonzalez /* 19153b29b68bSAlan Stern * Choose a device number. 19163b29b68bSAlan Stern * 19173b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 19183b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 19193b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 19203b29b68bSAlan Stern * and it usually is not the same as the device number. 19213b29b68bSAlan Stern * 19228af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 19238af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 19248af548dcSInaky Perez-Gonzalez * life of the device connection logic in 19258af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 19268af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 19278af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 19288af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 19298af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 19308af548dcSInaky Perez-Gonzalez * [X | 0x80]. 19318af548dcSInaky Perez-Gonzalez * 19328af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 19338af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 19348af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 19358af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 19368af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 1937c6515272SSarah Sharp * 1938c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 1939c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 1940c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 1941c6515272SSarah Sharp * command to the hardware. 19428af548dcSInaky Perez-Gonzalez */ 19433b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 19441da177e4SLinus Torvalds { 19451da177e4SLinus Torvalds int devnum; 19461da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 19471da177e4SLinus Torvalds 19481da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 19498af548dcSInaky Perez-Gonzalez if (udev->wusb) { 19508af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 19518af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 19528af548dcSInaky Perez-Gonzalez } else { 19538af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 19548af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 19551da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 19561da177e4SLinus Torvalds bus->devnum_next); 19571da177e4SLinus Torvalds if (devnum >= 128) 19588af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 19598af548dcSInaky Perez-Gonzalez 128, 1); 19601da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 19618af548dcSInaky Perez-Gonzalez } 19621da177e4SLinus Torvalds if (devnum < 128) { 19631da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 19641da177e4SLinus Torvalds udev->devnum = devnum; 19651da177e4SLinus Torvalds } 19661da177e4SLinus Torvalds } 19671da177e4SLinus Torvalds 19683b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 19691da177e4SLinus Torvalds { 19701da177e4SLinus Torvalds if (udev->devnum > 0) { 19711da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 19721da177e4SLinus Torvalds udev->devnum = -1; 19731da177e4SLinus Torvalds } 19741da177e4SLinus Torvalds } 19751da177e4SLinus Torvalds 19763b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 19774953d141SDavid Vrabel { 19784953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 19794953d141SDavid Vrabel if (!udev->wusb) 19804953d141SDavid Vrabel udev->devnum = devnum; 19814953d141SDavid Vrabel } 19824953d141SDavid Vrabel 1983f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 1984f7410cedSHerbert Xu { 1985f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 1986f7410cedSHerbert Xu 1987f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 1988f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 1989f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 1990f7410cedSHerbert Xu } 1991f7410cedSHerbert Xu 19921da177e4SLinus Torvalds /** 19931da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 19941da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 19951da177e4SLinus Torvalds * Context: !in_interrupt () 19961da177e4SLinus Torvalds * 19971da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 19981da177e4SLinus Torvalds * 19991da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 20001da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 20011da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 20021da177e4SLinus Torvalds * 20031da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 20041da177e4SLinus Torvalds * controllers) should ever call this. 20051da177e4SLinus Torvalds * 20061da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 20071da177e4SLinus Torvalds */ 20081da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 20091da177e4SLinus Torvalds { 20101da177e4SLinus Torvalds struct usb_device *udev = *pdev; 2011ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 20121da177e4SLinus Torvalds int i; 20131da177e4SLinus Torvalds 20141da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 20151da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 201625985edcSLucas De Marchi * this quiesces everything except pending urbs. 20171da177e4SLinus Torvalds */ 20181da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 20193b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 20203b29b68bSAlan Stern udev->devnum); 20211da177e4SLinus Torvalds 20229ad3d6ccSAlan Stern usb_lock_device(udev); 20239ad3d6ccSAlan Stern 20241da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 20258816230eSHuajun Li for (i = 0; i < udev->maxchild; i++) { 2026ff823c79SLan Tianyu if (hub->ports[i]->child) 2027ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 20281da177e4SLinus Torvalds } 20291da177e4SLinus Torvalds 20301da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 20311da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 20321da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 20331da177e4SLinus Torvalds */ 2034782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 20351da177e4SLinus Torvalds usb_disable_device(udev, 0); 2036cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 20371da177e4SLinus Torvalds 2038fde26380SLan Tianyu if (udev->parent) { 2039ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2040ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2041fde26380SLan Tianyu 2042fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2043fde26380SLan Tianyu sysfs_remove_link(&port_dev->dev.kobj, "device"); 2044971fcd49SLan Tianyu 2045ad493e5eSLan Tianyu if (!port_dev->did_runtime_put) 2046971fcd49SLan Tianyu pm_runtime_put(&port_dev->dev); 2047ad493e5eSLan Tianyu else 2048ad493e5eSLan Tianyu port_dev->did_runtime_put = false; 2049fde26380SLan Tianyu } 2050fde26380SLan Tianyu 20513b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 2052782da727SAlan Stern usb_unlock_device(udev); 20533099e75aSGreg Kroah-Hartman 2054782da727SAlan Stern /* Unregister the device. The device driver is responsible 20553b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 20563b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2057782da727SAlan Stern */ 2058782da727SAlan Stern device_del(&udev->dev); 2059782da727SAlan Stern 2060782da727SAlan Stern /* Free the device number and delete the parent's children[] 20611da177e4SLinus Torvalds * (or root_hub) pointer. 20621da177e4SLinus Torvalds */ 20633b29b68bSAlan Stern release_devnum(udev); 20641da177e4SLinus Torvalds 20651da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 20661da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 20671da177e4SLinus Torvalds *pdev = NULL; 20681da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 20691da177e4SLinus Torvalds 2070f7410cedSHerbert Xu hub_free_dev(udev); 2071f7410cedSHerbert Xu 2072782da727SAlan Stern put_device(&udev->dev); 20731da177e4SLinus Torvalds } 20741da177e4SLinus Torvalds 2075f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 20761da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 20771da177e4SLinus Torvalds { 20781da177e4SLinus Torvalds if (!string) 20791da177e4SLinus Torvalds return; 2080f2ec522eSJoe Perches dev_info(&udev->dev, "%s: %s\n", id, string); 20811da177e4SLinus Torvalds } 20821da177e4SLinus Torvalds 2083f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 2084f2a383e4SGreg Kroah-Hartman { 2085f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 2086f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 2087f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 2088b9cef6c3SWu Fengguang dev_info(&udev->dev, 2089b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 2090f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 2091f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 2092f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 2093f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 2094f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 2095f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 2096f2a383e4SGreg Kroah-Hartman } 20971da177e4SLinus Torvalds #else 2098f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 20991da177e4SLinus Torvalds #endif 21001da177e4SLinus Torvalds 21011da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 21021da177e4SLinus Torvalds #include "otg_whitelist.h" 21031da177e4SLinus Torvalds #endif 21041da177e4SLinus Torvalds 21053ede760fSOliver Neukum /** 21068d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 21073ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 21083ede760fSOliver Neukum * 21098d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 21103ede760fSOliver Neukum */ 21118d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 21121da177e4SLinus Torvalds { 2113d9d16e8aSInaky Perez-Gonzalez int err = 0; 21141da177e4SLinus Torvalds 21151da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 21161da177e4SLinus Torvalds /* 21171da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 21181da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 21191da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 21201da177e4SLinus Torvalds */ 21211da177e4SLinus Torvalds if (!udev->bus->is_b_host 21221da177e4SLinus Torvalds && udev->config 21231da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 21242eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 21251da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 21261da177e4SLinus Torvalds 21271da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 21281da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 21291da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 21301da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 21311da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 213212c3da34SAlan Stern unsigned port1 = udev->portnum; 21331da177e4SLinus Torvalds 21341da177e4SLinus Torvalds dev_info(&udev->dev, 21351da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 21361da177e4SLinus Torvalds (port1 == bus->otg_port) 21371da177e4SLinus Torvalds ? "" : "non-"); 21381da177e4SLinus Torvalds 21391da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 21401da177e4SLinus Torvalds if (port1 == bus->otg_port) 21411da177e4SLinus Torvalds bus->b_hnp_enable = 1; 21421da177e4SLinus Torvalds err = usb_control_msg(udev, 21431da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 21441da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 21451da177e4SLinus Torvalds bus->b_hnp_enable 21461da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 21471da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 21481da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 21491da177e4SLinus Torvalds if (err < 0) { 21501da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 21511da177e4SLinus Torvalds * customize to match your product. 21521da177e4SLinus Torvalds */ 21531da177e4SLinus Torvalds dev_info(&udev->dev, 2154b9cef6c3SWu Fengguang "can't set HNP mode: %d\n", 21551da177e4SLinus Torvalds err); 21561da177e4SLinus Torvalds bus->b_hnp_enable = 0; 21571da177e4SLinus Torvalds } 21581da177e4SLinus Torvalds } 21591da177e4SLinus Torvalds } 21601da177e4SLinus Torvalds } 21611da177e4SLinus Torvalds 21621da177e4SLinus Torvalds if (!is_targeted(udev)) { 21631da177e4SLinus Torvalds 21641da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 21651da177e4SLinus Torvalds * (Includes HNP test device.) 21661da177e4SLinus Torvalds */ 21671da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 2168634a84f8SDavid Brownell err = usb_port_suspend(udev, PMSG_SUSPEND); 21691da177e4SLinus Torvalds if (err < 0) 21701da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 21711da177e4SLinus Torvalds } 2172ffcdc18dSVikram Pandita err = -ENOTSUPP; 21731da177e4SLinus Torvalds goto fail; 21741da177e4SLinus Torvalds } 2175d9d16e8aSInaky Perez-Gonzalez fail: 21761da177e4SLinus Torvalds #endif 2177d9d16e8aSInaky Perez-Gonzalez return err; 2178d9d16e8aSInaky Perez-Gonzalez } 21791da177e4SLinus Torvalds 2180d9d16e8aSInaky Perez-Gonzalez 2181d9d16e8aSInaky Perez-Gonzalez /** 21828d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 2183d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2184d9d16e8aSInaky Perez-Gonzalez * 2185d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 2186d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 2187d9d16e8aSInaky Perez-Gonzalez * environment. 2188d9d16e8aSInaky Perez-Gonzalez * 2189d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 2190d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 2191d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 2192d9d16e8aSInaky Perez-Gonzalez */ 21938d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 2194d9d16e8aSInaky Perez-Gonzalez { 2195d9d16e8aSInaky Perez-Gonzalez int err; 2196d9d16e8aSInaky Perez-Gonzalez 2197d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 2198d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 2199d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 2200e9e88fb7SAlan Stern if (err != -ENODEV) 2201d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 2202d9d16e8aSInaky Perez-Gonzalez err); 220380da2e0dSLaurent Pinchart return err; 2204d9d16e8aSInaky Perez-Gonzalez } 2205d9d16e8aSInaky Perez-Gonzalez } 2206d9d16e8aSInaky Perez-Gonzalez if (udev->wusb == 1 && udev->authorized == 0) { 2207d9d16e8aSInaky Perez-Gonzalez udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2208d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2209d9d16e8aSInaky Perez-Gonzalez udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2210d9d16e8aSInaky Perez-Gonzalez } 2211d9d16e8aSInaky Perez-Gonzalez else { 2212d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 2213d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 2214d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 2215d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 2216d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 2217d9d16e8aSInaky Perez-Gonzalez } 22188d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 221980da2e0dSLaurent Pinchart if (err < 0) 2220d9d16e8aSInaky Perez-Gonzalez return err; 222180da2e0dSLaurent Pinchart 222280da2e0dSLaurent Pinchart usb_detect_interface_quirks(udev); 222380da2e0dSLaurent Pinchart 222480da2e0dSLaurent Pinchart return 0; 2225d9d16e8aSInaky Perez-Gonzalez } 2226d9d16e8aSInaky Perez-Gonzalez 2227d35e70d5SMatthew Garrett static void set_usb_port_removable(struct usb_device *udev) 2228d35e70d5SMatthew Garrett { 2229d35e70d5SMatthew Garrett struct usb_device *hdev = udev->parent; 2230d35e70d5SMatthew Garrett struct usb_hub *hub; 2231d35e70d5SMatthew Garrett u8 port = udev->portnum; 2232d35e70d5SMatthew Garrett u16 wHubCharacteristics; 2233d35e70d5SMatthew Garrett bool removable = true; 2234d35e70d5SMatthew Garrett 2235d35e70d5SMatthew Garrett if (!hdev) 2236d35e70d5SMatthew Garrett return; 2237d35e70d5SMatthew Garrett 2238ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 2239d35e70d5SMatthew Garrett 2240d35e70d5SMatthew Garrett wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 2241d35e70d5SMatthew Garrett 2242d35e70d5SMatthew Garrett if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) 2243d35e70d5SMatthew Garrett return; 2244d35e70d5SMatthew Garrett 2245d35e70d5SMatthew Garrett if (hub_is_superspeed(hdev)) { 2246ca3c1539SLan Tianyu if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) 2247ca3c1539SLan Tianyu & (1 << port)) 2248d35e70d5SMatthew Garrett removable = false; 2249d35e70d5SMatthew Garrett } else { 2250d35e70d5SMatthew Garrett if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) 2251d35e70d5SMatthew Garrett removable = false; 2252d35e70d5SMatthew Garrett } 2253d35e70d5SMatthew Garrett 2254d35e70d5SMatthew Garrett if (removable) 2255d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 2256d35e70d5SMatthew Garrett else 2257d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 2258d35e70d5SMatthew Garrett } 2259d9d16e8aSInaky Perez-Gonzalez 2260d9d16e8aSInaky Perez-Gonzalez /** 2261d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 2262d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2263d9d16e8aSInaky Perez-Gonzalez * 22648d8558d1SAlan Stern * This is called with devices which have been detected but not fully 22658d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 2266d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 2267d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 2268d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 2269d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 2270d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 2271d9d16e8aSInaky Perez-Gonzalez * 2272d9d16e8aSInaky Perez-Gonzalez * It will return if the device is configured properly or not. Zero if 2273d9d16e8aSInaky Perez-Gonzalez * the interface was registered with the driver core; else a negative 2274d9d16e8aSInaky Perez-Gonzalez * errno value. 2275d9d16e8aSInaky Perez-Gonzalez * 2276d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 2277d9d16e8aSInaky Perez-Gonzalez * 2278d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 2279d9d16e8aSInaky Perez-Gonzalez */ 2280d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 2281d9d16e8aSInaky Perez-Gonzalez { 2282d9d16e8aSInaky Perez-Gonzalez int err; 2283d9d16e8aSInaky Perez-Gonzalez 228416985408SDan Streetman if (udev->parent) { 228516985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 228616985408SDan Streetman * device (un)configuration controls wakeup capable 228716985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 228816985408SDan Streetman */ 228916985408SDan Streetman device_init_wakeup(&udev->dev, 0); 229016985408SDan Streetman } 229116985408SDan Streetman 22929bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 22939bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 2294c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 2295fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 22969bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 22979bbdf1e0SAlan Stern 2298c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 2299c08512c7SAlan Stern * allowed for hubs during binding. 2300c08512c7SAlan Stern */ 2301c08512c7SAlan Stern usb_disable_autosuspend(udev); 2302c08512c7SAlan Stern 23038d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 2304d9d16e8aSInaky Perez-Gonzalez if (err < 0) 2305d9d16e8aSInaky Perez-Gonzalez goto fail; 2306c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 2307c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 2308c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 23099f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 23109f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 23119f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 23129f8b17e6SKay Sievers 23136cd13201SAlan Stern /* Tell the world! */ 23146cd13201SAlan Stern announce_device(udev); 2315195af2ccSAlan Stern 2316b04b3156STheodore Ts'o if (udev->serial) 2317b04b3156STheodore Ts'o add_device_randomness(udev->serial, strlen(udev->serial)); 2318b04b3156STheodore Ts'o if (udev->product) 2319b04b3156STheodore Ts'o add_device_randomness(udev->product, strlen(udev->product)); 2320b04b3156STheodore Ts'o if (udev->manufacturer) 2321b04b3156STheodore Ts'o add_device_randomness(udev->manufacturer, 2322b04b3156STheodore Ts'o strlen(udev->manufacturer)); 2323b04b3156STheodore Ts'o 2324927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 2325d35e70d5SMatthew Garrett 2326d35e70d5SMatthew Garrett /* 2327d35e70d5SMatthew Garrett * check whether the hub marks this port as non-removable. Do it 2328d35e70d5SMatthew Garrett * now so that platform-specific data can override it in 2329d35e70d5SMatthew Garrett * device_add() 2330d35e70d5SMatthew Garrett */ 2331d35e70d5SMatthew Garrett if (udev->parent) 2332d35e70d5SMatthew Garrett set_usb_port_removable(udev); 2333d35e70d5SMatthew Garrett 2334782da727SAlan Stern /* Register the device. The device driver is responsible 23353b23dd6fSAlan Stern * for configuring the device and invoking the add-device 23363b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2337782da727SAlan Stern */ 23381da177e4SLinus Torvalds err = device_add(&udev->dev); 23391da177e4SLinus Torvalds if (err) { 23401da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 23411da177e4SLinus Torvalds goto fail; 23421da177e4SLinus Torvalds } 23439ad3d6ccSAlan Stern 2344fde26380SLan Tianyu /* Create link files between child device and usb port device. */ 2345fde26380SLan Tianyu if (udev->parent) { 2346ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2347ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2348fde26380SLan Tianyu 2349fde26380SLan Tianyu err = sysfs_create_link(&udev->dev.kobj, 2350fde26380SLan Tianyu &port_dev->dev.kobj, "port"); 2351fde26380SLan Tianyu if (err) 2352fde26380SLan Tianyu goto fail; 2353fde26380SLan Tianyu 2354fde26380SLan Tianyu err = sysfs_create_link(&port_dev->dev.kobj, 2355fde26380SLan Tianyu &udev->dev.kobj, "device"); 2356fde26380SLan Tianyu if (err) { 2357fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2358fde26380SLan Tianyu goto fail; 2359fde26380SLan Tianyu } 2360971fcd49SLan Tianyu 2361971fcd49SLan Tianyu pm_runtime_get_sync(&port_dev->dev); 2362fde26380SLan Tianyu } 2363fde26380SLan Tianyu 23643b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 2365c08512c7SAlan Stern usb_mark_last_busy(udev); 2366c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 2367c066475eSGreg Kroah-Hartman return err; 23681da177e4SLinus Torvalds 23691da177e4SLinus Torvalds fail: 23701da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 23719bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 23729bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 2373d9d16e8aSInaky Perez-Gonzalez return err; 23741da177e4SLinus Torvalds } 23751da177e4SLinus Torvalds 237693993a0aSInaky Perez-Gonzalez 237793993a0aSInaky Perez-Gonzalez /** 2378fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 2379fd39c86bSRandy Dunlap * @usb_dev: USB device 2380fd39c86bSRandy Dunlap * 2381fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 2382fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 238393993a0aSInaky Perez-Gonzalez * 238493993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 238593993a0aSInaky Perez-Gonzalez * defer its call. 238693993a0aSInaky Perez-Gonzalez */ 238793993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 238893993a0aSInaky Perez-Gonzalez { 238993993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 239093993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 239193993a0aSInaky Perez-Gonzalez goto out_unauthorized; 2392da307123SAlan Stern 239393993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 239493993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 2395da307123SAlan Stern 2396da307123SAlan Stern kfree(usb_dev->product); 239793993a0aSInaky Perez-Gonzalez usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2398da307123SAlan Stern kfree(usb_dev->manufacturer); 239993993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2400da307123SAlan Stern kfree(usb_dev->serial); 240193993a0aSInaky Perez-Gonzalez usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2402da307123SAlan Stern 2403da307123SAlan Stern usb_destroy_configuration(usb_dev); 240493993a0aSInaky Perez-Gonzalez usb_dev->descriptor.bNumConfigurations = 0; 2405da307123SAlan Stern 240693993a0aSInaky Perez-Gonzalez out_unauthorized: 240793993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 240893993a0aSInaky Perez-Gonzalez return 0; 240993993a0aSInaky Perez-Gonzalez } 241093993a0aSInaky Perez-Gonzalez 241193993a0aSInaky Perez-Gonzalez 241293993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 241393993a0aSInaky Perez-Gonzalez { 241493993a0aSInaky Perez-Gonzalez int result = 0, c; 2415da307123SAlan Stern 241693993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 241793993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 241893993a0aSInaky Perez-Gonzalez goto out_authorized; 2419da307123SAlan Stern 242093993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 242193993a0aSInaky Perez-Gonzalez if (result < 0) { 242293993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 242393993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 242493993a0aSInaky Perez-Gonzalez goto error_autoresume; 242593993a0aSInaky Perez-Gonzalez } 242693993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 242793993a0aSInaky Perez-Gonzalez if (result < 0) { 242893993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 242993993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 243093993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 243193993a0aSInaky Perez-Gonzalez } 2432da307123SAlan Stern 2433da307123SAlan Stern kfree(usb_dev->product); 2434da307123SAlan Stern usb_dev->product = NULL; 2435da307123SAlan Stern kfree(usb_dev->manufacturer); 2436da307123SAlan Stern usb_dev->manufacturer = NULL; 2437da307123SAlan Stern kfree(usb_dev->serial); 2438da307123SAlan Stern usb_dev->serial = NULL; 2439da307123SAlan Stern 244093993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 24418d8558d1SAlan Stern result = usb_enumerate_device(usb_dev); 244293993a0aSInaky Perez-Gonzalez if (result < 0) 24438d8558d1SAlan Stern goto error_enumerate; 244493993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 244593993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 244693993a0aSInaky Perez-Gonzalez */ 2447b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 244893993a0aSInaky Perez-Gonzalez if (c >= 0) { 244993993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 245093993a0aSInaky Perez-Gonzalez if (result) { 245193993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 245293993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 245393993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 245493993a0aSInaky Perez-Gonzalez * set other configurations. */ 245593993a0aSInaky Perez-Gonzalez } 245693993a0aSInaky Perez-Gonzalez } 245793993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2458da307123SAlan Stern 24598d8558d1SAlan Stern error_enumerate: 246093993a0aSInaky Perez-Gonzalez error_device_descriptor: 2461da307123SAlan Stern usb_autosuspend_device(usb_dev); 246293993a0aSInaky Perez-Gonzalez error_autoresume: 246393993a0aSInaky Perez-Gonzalez out_authorized: 246493993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); // complements locktree 246593993a0aSInaky Perez-Gonzalez return result; 246693993a0aSInaky Perez-Gonzalez } 246793993a0aSInaky Perez-Gonzalez 246893993a0aSInaky Perez-Gonzalez 24690165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 24700165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 24710165de09SInaky Perez-Gonzalez { 24720165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 24730165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 24740165de09SInaky Perez-Gonzalez return 0; 24750165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 24760165de09SInaky Perez-Gonzalez return hcd->wireless; 24770165de09SInaky Perez-Gonzalez } 24780165de09SInaky Perez-Gonzalez 24790165de09SInaky Perez-Gonzalez 24801da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 24811da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 24821da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 24831da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 248490ab5ee9SRusty Russell #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) 24851da177e4SLinus Torvalds 24861da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 24871da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 248875d7cf72SAndiry Xu #define HUB_BH_RESET_TIME 50 24891da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 249077c7f072SSarah Sharp #define HUB_RESET_TIMEOUT 800 24911da177e4SLinus Torvalds 249210d674a8SSarah Sharp static int hub_port_reset(struct usb_hub *hub, int port1, 249310d674a8SSarah Sharp struct usb_device *udev, unsigned int delay, bool warm); 249410d674a8SSarah Sharp 24958bea2bd3SStanislaw Ledwon /* Is a USB 3.0 port in the Inactive or Complinance Mode state? 24968bea2bd3SStanislaw Ledwon * Port worm reset is required to recover 24978bea2bd3SStanislaw Ledwon */ 24988bea2bd3SStanislaw Ledwon static bool hub_port_warm_reset_required(struct usb_hub *hub, u16 portstatus) 249910d674a8SSarah Sharp { 250010d674a8SSarah Sharp return hub_is_superspeed(hub->hdev) && 25018bea2bd3SStanislaw Ledwon (((portstatus & USB_PORT_STAT_LINK_STATE) == 25028bea2bd3SStanislaw Ledwon USB_SS_PORT_LS_SS_INACTIVE) || 25038bea2bd3SStanislaw Ledwon ((portstatus & USB_PORT_STAT_LINK_STATE) == 25048bea2bd3SStanislaw Ledwon USB_SS_PORT_LS_COMP_MOD)) ; 250510d674a8SSarah Sharp } 250610d674a8SSarah Sharp 25071da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 250875d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 25091da177e4SLinus Torvalds { 25101da177e4SLinus Torvalds int delay_time, ret; 25111da177e4SLinus Torvalds u16 portstatus; 25121da177e4SLinus Torvalds u16 portchange; 25131da177e4SLinus Torvalds 25141da177e4SLinus Torvalds for (delay_time = 0; 25151da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 25161da177e4SLinus Torvalds delay_time += delay) { 25171da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 25181da177e4SLinus Torvalds msleep(delay); 25191da177e4SLinus Torvalds 25201da177e4SLinus Torvalds /* read and decode port status */ 25211da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 25221da177e4SLinus Torvalds if (ret < 0) 25231da177e4SLinus Torvalds return ret; 25241da177e4SLinus Torvalds 25254f43447eSSarah Sharp /* The port state is unknown until the reset completes. */ 2526470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_RESET)) 2527470f0be8SSarah Sharp break; 2528470f0be8SSarah Sharp 2529470f0be8SSarah Sharp /* switch to the long delay after two short delay failures */ 2530470f0be8SSarah Sharp if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 2531470f0be8SSarah Sharp delay = HUB_LONG_RESET_TIME; 2532470f0be8SSarah Sharp 2533470f0be8SSarah Sharp dev_dbg (hub->intfdev, 2534470f0be8SSarah Sharp "port %d not %sreset yet, waiting %dms\n", 2535470f0be8SSarah Sharp port1, warm ? "warm " : "", delay); 2536470f0be8SSarah Sharp } 2537470f0be8SSarah Sharp 25384f43447eSSarah Sharp if ((portstatus & USB_PORT_STAT_RESET)) 2539470f0be8SSarah Sharp return -EBUSY; 25404f43447eSSarah Sharp 2541a24a6078SSarah Sharp if (hub_port_warm_reset_required(hub, portstatus)) 2542a24a6078SSarah Sharp return -ENOTCONN; 254310d674a8SSarah Sharp 25441da177e4SLinus Torvalds /* Device went away? */ 25451da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 25461da177e4SLinus Torvalds return -ENOTCONN; 25471da177e4SLinus Torvalds 2548a24a6078SSarah Sharp /* bomb out completely if the connection bounced. A USB 3.0 2549a24a6078SSarah Sharp * connection may bounce if multiple warm resets were issued, 2550a24a6078SSarah Sharp * but the device may have successfully re-connected. Ignore it. 2551a24a6078SSarah Sharp */ 2552a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev) && 2553a24a6078SSarah Sharp (portchange & USB_PORT_STAT_C_CONNECTION)) 2554dd4dd19eSAlan Stern return -ENOTCONN; 25551da177e4SLinus Torvalds 2556470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_ENABLE)) 2557470f0be8SSarah Sharp return -EBUSY; 2558470f0be8SSarah Sharp 25592d4fa940SSarah Sharp if (!udev) 25602d4fa940SSarah Sharp return 0; 25612d4fa940SSarah Sharp 25620165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2563551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 2564131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2565809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 25660165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 25671da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 25681da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 25691da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 25701da177e4SLinus Torvalds else 25711da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 25721da177e4SLinus Torvalds return 0; 25731da177e4SLinus Torvalds } 25741da177e4SLinus Torvalds 257575d7cf72SAndiry Xu static void hub_port_finish_reset(struct usb_hub *hub, int port1, 2576a24a6078SSarah Sharp struct usb_device *udev, int *status) 25771da177e4SLinus Torvalds { 257875d7cf72SAndiry Xu switch (*status) { 25791da177e4SLinus Torvalds case 0: 2580b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 2581b789696aSDavid Brownell msleep(10 + 40); 25822d4fa940SSarah Sharp if (udev) { 2583a24a6078SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2584a24a6078SSarah Sharp 25853b29b68bSAlan Stern update_devnum(udev, 0); 2586a24a6078SSarah Sharp /* The xHC may think the device is already reset, 2587a24a6078SSarah Sharp * so ignore the status. 25888b8132bcSSarah Sharp */ 25898b8132bcSSarah Sharp if (hcd->driver->reset_device) 25908b8132bcSSarah Sharp hcd->driver->reset_device(hcd, udev); 259175d7cf72SAndiry Xu } 25921da177e4SLinus Torvalds /* FALL THROUGH */ 25931da177e4SLinus Torvalds case -ENOTCONN: 25941da177e4SLinus Torvalds case -ENODEV: 2595ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, 25961da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 25971c7439c6SSarah Sharp if (hub_is_superspeed(hub->hdev)) { 2598ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 259975d7cf72SAndiry Xu USB_PORT_FEAT_C_BH_PORT_RESET); 2600ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 260175d7cf72SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 2602ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2603a24a6078SSarah Sharp USB_PORT_FEAT_C_CONNECTION); 26041c7439c6SSarah Sharp } 2605a24a6078SSarah Sharp if (udev) 260675d7cf72SAndiry Xu usb_set_device_state(udev, *status 26071da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 26081da177e4SLinus Torvalds : USB_STATE_DEFAULT); 260975d7cf72SAndiry Xu break; 261075d7cf72SAndiry Xu } 261175d7cf72SAndiry Xu } 261275d7cf72SAndiry Xu 261375d7cf72SAndiry Xu /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ 261475d7cf72SAndiry Xu static int hub_port_reset(struct usb_hub *hub, int port1, 261575d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 261675d7cf72SAndiry Xu { 261775d7cf72SAndiry Xu int i, status; 2618a24a6078SSarah Sharp u16 portchange, portstatus; 261975d7cf72SAndiry Xu 262075d7cf72SAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 26210fe51aa5SSarah Sharp if (warm) { 262275d7cf72SAndiry Xu dev_err(hub->intfdev, "only USB3 hub support " 262375d7cf72SAndiry Xu "warm reset\n"); 262475d7cf72SAndiry Xu return -EINVAL; 262575d7cf72SAndiry Xu } 26260fe51aa5SSarah Sharp /* Block EHCI CF initialization during the port reset. 26270fe51aa5SSarah Sharp * Some companion controllers don't like it when they mix. 26280fe51aa5SSarah Sharp */ 26290fe51aa5SSarah Sharp down_read(&ehci_cf_port_reset_rwsem); 2630d3b9d7a9SSarah Sharp } else if (!warm) { 2631d3b9d7a9SSarah Sharp /* 2632d3b9d7a9SSarah Sharp * If the caller hasn't explicitly requested a warm reset, 2633d3b9d7a9SSarah Sharp * double check and see if one is needed. 2634d3b9d7a9SSarah Sharp */ 2635d3b9d7a9SSarah Sharp status = hub_port_status(hub, port1, 2636d3b9d7a9SSarah Sharp &portstatus, &portchange); 2637d3b9d7a9SSarah Sharp if (status < 0) 2638d3b9d7a9SSarah Sharp goto done; 2639d3b9d7a9SSarah Sharp 2640d3b9d7a9SSarah Sharp if (hub_port_warm_reset_required(hub, portstatus)) 2641d3b9d7a9SSarah Sharp warm = true; 264275d7cf72SAndiry Xu } 264375d7cf72SAndiry Xu 264475d7cf72SAndiry Xu /* Reset the port */ 264575d7cf72SAndiry Xu for (i = 0; i < PORT_RESET_TRIES; i++) { 264675d7cf72SAndiry Xu status = set_port_feature(hub->hdev, port1, (warm ? 264775d7cf72SAndiry Xu USB_PORT_FEAT_BH_PORT_RESET : 264875d7cf72SAndiry Xu USB_PORT_FEAT_RESET)); 2649e9e88fb7SAlan Stern if (status == -ENODEV) { 2650e9e88fb7SAlan Stern ; /* The hub is gone */ 2651e9e88fb7SAlan Stern } else if (status) { 265275d7cf72SAndiry Xu dev_err(hub->intfdev, 265375d7cf72SAndiry Xu "cannot %sreset port %d (err = %d)\n", 265475d7cf72SAndiry Xu warm ? "warm " : "", port1, status); 265575d7cf72SAndiry Xu } else { 265675d7cf72SAndiry Xu status = hub_port_wait_reset(hub, port1, udev, delay, 265775d7cf72SAndiry Xu warm); 2658e9e88fb7SAlan Stern if (status && status != -ENOTCONN && status != -ENODEV) 265975d7cf72SAndiry Xu dev_dbg(hub->intfdev, 266075d7cf72SAndiry Xu "port_wait_reset: err = %d\n", 266175d7cf72SAndiry Xu status); 266275d7cf72SAndiry Xu } 266375d7cf72SAndiry Xu 2664a24a6078SSarah Sharp /* Check for disconnect or reset */ 266575d7cf72SAndiry Xu if (status == 0 || status == -ENOTCONN || status == -ENODEV) { 2666a24a6078SSarah Sharp hub_port_finish_reset(hub, port1, udev, &status); 2667a24a6078SSarah Sharp 2668a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 266932fe0198SAlan Stern goto done; 2670a24a6078SSarah Sharp 2671a24a6078SSarah Sharp /* 2672a24a6078SSarah Sharp * If a USB 3.0 device migrates from reset to an error 2673a24a6078SSarah Sharp * state, re-issue the warm reset. 2674a24a6078SSarah Sharp */ 2675a24a6078SSarah Sharp if (hub_port_status(hub, port1, 2676a24a6078SSarah Sharp &portstatus, &portchange) < 0) 2677a24a6078SSarah Sharp goto done; 2678a24a6078SSarah Sharp 2679a24a6078SSarah Sharp if (!hub_port_warm_reset_required(hub, portstatus)) 2680a24a6078SSarah Sharp goto done; 2681a24a6078SSarah Sharp 2682a24a6078SSarah Sharp /* 2683a24a6078SSarah Sharp * If the port is in SS.Inactive or Compliance Mode, the 2684a24a6078SSarah Sharp * hot or warm reset failed. Try another warm reset. 2685a24a6078SSarah Sharp */ 2686a24a6078SSarah Sharp if (!warm) { 2687a24a6078SSarah Sharp dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n", 2688a24a6078SSarah Sharp port1); 2689a24a6078SSarah Sharp warm = true; 2690a24a6078SSarah Sharp } 26911da177e4SLinus Torvalds } 26921da177e4SLinus Torvalds 26931da177e4SLinus Torvalds dev_dbg (hub->intfdev, 269475d7cf72SAndiry Xu "port %d not enabled, trying %sreset again...\n", 269575d7cf72SAndiry Xu port1, warm ? "warm " : ""); 26961da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 26971da177e4SLinus Torvalds } 26981da177e4SLinus Torvalds 26991da177e4SLinus Torvalds dev_err (hub->intfdev, 27001da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 27011da177e4SLinus Torvalds port1); 27021da177e4SLinus Torvalds 270332fe0198SAlan Stern done: 27040fe51aa5SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 270532fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 270675d7cf72SAndiry Xu 27071da177e4SLinus Torvalds return status; 27081da177e4SLinus Torvalds } 27091da177e4SLinus Torvalds 27100ed9a57eSAndiry Xu /* Check if a port is power on */ 27110ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 27120ed9a57eSAndiry Xu { 27130ed9a57eSAndiry Xu int ret = 0; 27140ed9a57eSAndiry Xu 27150ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 27160ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 27170ed9a57eSAndiry Xu ret = 1; 27180ed9a57eSAndiry Xu } else { 27190ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 27200ed9a57eSAndiry Xu ret = 1; 27210ed9a57eSAndiry Xu } 27220ed9a57eSAndiry Xu 27230ed9a57eSAndiry Xu return ret; 27240ed9a57eSAndiry Xu } 27250ed9a57eSAndiry Xu 2726d388dab7SAlan Stern #ifdef CONFIG_PM 27271da177e4SLinus Torvalds 27280ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 27290ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 27300ed9a57eSAndiry Xu { 27310ed9a57eSAndiry Xu int ret = 0; 27320ed9a57eSAndiry Xu 27330ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 27340ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 27350ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 27360ed9a57eSAndiry Xu ret = 1; 27370ed9a57eSAndiry Xu } else { 27380ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 27390ed9a57eSAndiry Xu ret = 1; 27400ed9a57eSAndiry Xu } 27410ed9a57eSAndiry Xu 27420ed9a57eSAndiry Xu return ret; 27430ed9a57eSAndiry Xu } 2744b01b03f3SAlan Stern 2745b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2746b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2747b01b03f3SAlan Stern */ 2748b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2749b01b03f3SAlan Stern struct usb_hub *hub, int port1, 2750b01b03f3SAlan Stern int status, unsigned portchange, unsigned portstatus) 2751b01b03f3SAlan Stern { 2752b01b03f3SAlan Stern /* Is the device still present? */ 27530ed9a57eSAndiry Xu if (status || port_is_suspended(hub, portstatus) || 27540ed9a57eSAndiry Xu !port_is_power_on(hub, portstatus) || 27550ed9a57eSAndiry Xu !(portstatus & USB_PORT_STAT_CONNECTION)) { 2756b01b03f3SAlan Stern if (status >= 0) 2757b01b03f3SAlan Stern status = -ENODEV; 2758b01b03f3SAlan Stern } 2759b01b03f3SAlan Stern 276086c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 276186c57edfSAlan Stern * so try a reset-resume instead. 276286c57edfSAlan Stern */ 276386c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 276486c57edfSAlan Stern if (udev->persist_enabled) 276586c57edfSAlan Stern udev->reset_resume = 1; 276686c57edfSAlan Stern else 2767b01b03f3SAlan Stern status = -ENODEV; 276886c57edfSAlan Stern } 2769b01b03f3SAlan Stern 2770b01b03f3SAlan Stern if (status) { 2771b01b03f3SAlan Stern dev_dbg(hub->intfdev, 2772b01b03f3SAlan Stern "port %d status %04x.%04x after resume, %d\n", 2773b01b03f3SAlan Stern port1, portchange, portstatus, status); 2774b01b03f3SAlan Stern } else if (udev->reset_resume) { 2775b01b03f3SAlan Stern 2776b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2777b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2778ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2779b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2780b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2781ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2782b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2783b01b03f3SAlan Stern } 2784b01b03f3SAlan Stern 2785b01b03f3SAlan Stern return status; 2786b01b03f3SAlan Stern } 2787b01b03f3SAlan Stern 2788f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 2789f74631e3SSarah Sharp { 2790f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2791f74631e3SSarah Sharp 2792f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2793f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2794f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2795f74631e3SSarah Sharp return 0; 2796f74631e3SSarah Sharp 2797f74631e3SSarah Sharp /* Clear Feature LTM Enable can only be sent if the device is 2798f74631e3SSarah Sharp * configured. 2799f74631e3SSarah Sharp */ 2800f74631e3SSarah Sharp if (!udev->actconfig) 2801f74631e3SSarah Sharp return 0; 2802f74631e3SSarah Sharp 2803f74631e3SSarah Sharp return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2804f74631e3SSarah Sharp USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2805f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2806f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2807f74631e3SSarah Sharp } 2808f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 2809f74631e3SSarah Sharp 2810f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) 2811f74631e3SSarah Sharp { 2812f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2813f74631e3SSarah Sharp 2814f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2815f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2816f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2817f74631e3SSarah Sharp return; 2818f74631e3SSarah Sharp 2819f74631e3SSarah Sharp /* Set Feature LTM Enable can only be sent if the device is 2820f74631e3SSarah Sharp * configured. 2821f74631e3SSarah Sharp */ 2822f74631e3SSarah Sharp if (!udev->actconfig) 2823f74631e3SSarah Sharp return; 2824f74631e3SSarah Sharp 2825f74631e3SSarah Sharp usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2826f74631e3SSarah Sharp USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2827f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2828f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2829f74631e3SSarah Sharp } 2830f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 2831f74631e3SSarah Sharp 283254a3ac0cSLan Tianyu /* 283354a3ac0cSLan Tianyu * usb_disable_function_remotewakeup - disable usb3.0 283454a3ac0cSLan Tianyu * device's function remote wakeup 283554a3ac0cSLan Tianyu * @udev: target device 283654a3ac0cSLan Tianyu * 283754a3ac0cSLan Tianyu * Assume there's only one function on the USB 3.0 283854a3ac0cSLan Tianyu * device and disable remote wake for the first 283954a3ac0cSLan Tianyu * interface. FIXME if the interface association 284054a3ac0cSLan Tianyu * descriptor shows there's more than one function. 284154a3ac0cSLan Tianyu */ 284254a3ac0cSLan Tianyu static int usb_disable_function_remotewakeup(struct usb_device *udev) 284354a3ac0cSLan Tianyu { 284454a3ac0cSLan Tianyu return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 284554a3ac0cSLan Tianyu USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, 284654a3ac0cSLan Tianyu USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, 284754a3ac0cSLan Tianyu USB_CTRL_SET_TIMEOUT); 284854a3ac0cSLan Tianyu } 28491da177e4SLinus Torvalds 28501da177e4SLinus Torvalds /* 2851140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 2852624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 28535edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 28541da177e4SLinus Torvalds * 28551da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 28561da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 28571da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 2858140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 28591da177e4SLinus Torvalds * to disconnect devices while they are suspended. 28601da177e4SLinus Torvalds * 2861390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 2862390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 2863390a8c34SDavid Brownell * 2864624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 2865624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 2866624d6c07SAlan Stern * All devices below the suspended port are also suspended. 2867624d6c07SAlan Stern * 2868624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 2869624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 2870624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 2871624d6c07SAlan Stern * some cases, this wakes the USB host. 2872624d6c07SAlan Stern * 28731da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 28741da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 28751da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 28761da177e4SLinus Torvalds * 28774956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 28784956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 28794956eccdSAlan Stern * State transitions include: 28804956eccdSAlan Stern * 28814956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 28824956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 28834956eccdSAlan Stern * 28844956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 28854956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 28864956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 28874956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 28884956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 28894956eccdSAlan Stern * 289084ebc102SAlan Stern * If Runtime PM isn't enabled or used, non-SuperSpeed devices really get 28910aa2832dSAlan Stern * suspended only when their bus goes into global suspend (i.e., the root 28920aa2832dSAlan Stern * hub is suspended). Nevertheless, we change @udev->state to 28930aa2832dSAlan Stern * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual 28940aa2832dSAlan Stern * upstream port setting is stored in @udev->port_is_suspended. 28954956eccdSAlan Stern * 28961da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 28971da177e4SLinus Torvalds */ 289865bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 28991da177e4SLinus Torvalds { 2900ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2901ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2902ad493e5eSLan Tianyu enum pm_qos_flags_status pm_qos_stat; 2903624d6c07SAlan Stern int port1 = udev->portnum; 2904624d6c07SAlan Stern int status; 29050aa2832dSAlan Stern bool really_suspend = true; 29064956eccdSAlan Stern 2907624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 2908624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 2909624d6c07SAlan Stern * 2910624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 2911624d6c07SAlan Stern * we don't explicitly enable it here. 2912624d6c07SAlan Stern */ 2913624d6c07SAlan Stern if (udev->do_remote_wakeup) { 2914623bef9eSSarah Sharp if (!hub_is_superspeed(hub->hdev)) { 2915624d6c07SAlan Stern status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2916624d6c07SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2917624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2918624d6c07SAlan Stern NULL, 0, 2919624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 2920623bef9eSSarah Sharp } else { 2921623bef9eSSarah Sharp /* Assume there's only one function on the USB 3.0 2922623bef9eSSarah Sharp * device and enable remote wake for the first 2923623bef9eSSarah Sharp * interface. FIXME if the interface association 2924623bef9eSSarah Sharp * descriptor shows there's more than one function. 2925623bef9eSSarah Sharp */ 2926623bef9eSSarah Sharp status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2927623bef9eSSarah Sharp USB_REQ_SET_FEATURE, 2928623bef9eSSarah Sharp USB_RECIP_INTERFACE, 2929623bef9eSSarah Sharp USB_INTRF_FUNC_SUSPEND, 29303b9b6acdSSarah Sharp USB_INTRF_FUNC_SUSPEND_RW | 29313b9b6acdSSarah Sharp USB_INTRF_FUNC_SUSPEND_LP, 2932623bef9eSSarah Sharp NULL, 0, 2933623bef9eSSarah Sharp USB_CTRL_SET_TIMEOUT); 2934623bef9eSSarah Sharp } 29350c487206SOliver Neukum if (status) { 2936624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 2937624d6c07SAlan Stern status); 29380c487206SOliver Neukum /* bail if autosuspend is requested */ 29395b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 29400c487206SOliver Neukum return status; 29410c487206SOliver Neukum } 2942624d6c07SAlan Stern } 2943624d6c07SAlan Stern 294465580b43SAndiry Xu /* disable USB2 hardware LPM */ 294565580b43SAndiry Xu if (udev->usb2_hw_lpm_enabled == 1) 294665580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 0); 294765580b43SAndiry Xu 2948f74631e3SSarah Sharp if (usb_disable_ltm(udev)) { 2949f74631e3SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LTM before suspend\n.", 2950f74631e3SSarah Sharp __func__); 2951f74631e3SSarah Sharp return -ENOMEM; 2952f74631e3SSarah Sharp } 29538306095fSSarah Sharp if (usb_unlocked_disable_lpm(udev)) { 29548306095fSSarah Sharp dev_err(&udev->dev, "%s Failed to disable LPM before suspend\n.", 29558306095fSSarah Sharp __func__); 29568306095fSSarah Sharp return -ENOMEM; 29578306095fSSarah Sharp } 29588306095fSSarah Sharp 2959624d6c07SAlan Stern /* see 7.1.7.6 */ 2960a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 2961c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); 29620aa2832dSAlan Stern else if (PMSG_IS_AUTO(msg)) 2963a8f08d86SAndiry Xu status = set_port_feature(hub->hdev, port1, 2964a8f08d86SAndiry Xu USB_PORT_FEAT_SUSPEND); 29650aa2832dSAlan Stern /* 29660aa2832dSAlan Stern * For system suspend, we do not need to enable the suspend feature 29670aa2832dSAlan Stern * on individual USB-2 ports. The devices will automatically go 29680aa2832dSAlan Stern * into suspend a few ms after the root hub stops sending packets. 29690aa2832dSAlan Stern * The USB 2.0 spec calls this "global suspend". 29700aa2832dSAlan Stern */ 29710aa2832dSAlan Stern else { 29720aa2832dSAlan Stern really_suspend = false; 29730aa2832dSAlan Stern status = 0; 29740aa2832dSAlan Stern } 2975624d6c07SAlan Stern if (status) { 2976624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 2977624d6c07SAlan Stern port1, status); 2978624d6c07SAlan Stern /* paranoia: "should not happen" */ 297954a3ac0cSLan Tianyu if (udev->do_remote_wakeup) { 298054a3ac0cSLan Tianyu if (!hub_is_superspeed(hub->hdev)) { 298154a3ac0cSLan Tianyu (void) usb_control_msg(udev, 298254a3ac0cSLan Tianyu usb_sndctrlpipe(udev, 0), 298354a3ac0cSLan Tianyu USB_REQ_CLEAR_FEATURE, 298454a3ac0cSLan Tianyu USB_RECIP_DEVICE, 2985624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2986624d6c07SAlan Stern NULL, 0, 2987624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 298854a3ac0cSLan Tianyu } else 298954a3ac0cSLan Tianyu (void) usb_disable_function_remotewakeup(udev); 299054a3ac0cSLan Tianyu 299154a3ac0cSLan Tianyu } 2992cbb33004SAlan Stern 2993c3e751e4SAndiry Xu /* Try to enable USB2 hardware LPM again */ 2994c3e751e4SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 2995c3e751e4SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 2996c3e751e4SAndiry Xu 2997f74631e3SSarah Sharp /* Try to enable USB3 LTM and LPM again */ 2998f74631e3SSarah Sharp usb_enable_ltm(udev); 29998306095fSSarah Sharp usb_unlocked_enable_lpm(udev); 30008306095fSSarah Sharp 3001cbb33004SAlan Stern /* System sleep transitions should never fail */ 30025b1b0b81SAlan Stern if (!PMSG_IS_AUTO(msg)) 3003cbb33004SAlan Stern status = 0; 3004624d6c07SAlan Stern } else { 3005624d6c07SAlan Stern /* device has up to 10 msec to fully suspend */ 300630b1a7a3SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", 300730b1a7a3SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : ""), 300830b1a7a3SAlan Stern udev->do_remote_wakeup); 3009624d6c07SAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 30100aa2832dSAlan Stern if (really_suspend) { 3011bfd1e910SAlan Stern udev->port_is_suspended = 1; 3012624d6c07SAlan Stern msleep(10); 3013624d6c07SAlan Stern } 30140aa2832dSAlan Stern } 3015ad493e5eSLan Tianyu 3016ad493e5eSLan Tianyu /* 3017ad493e5eSLan Tianyu * Check whether current status meets the requirement of 3018ad493e5eSLan Tianyu * usb port power off mechanism 3019ad493e5eSLan Tianyu */ 3020ad493e5eSLan Tianyu pm_qos_stat = dev_pm_qos_flags(&port_dev->dev, 3021ad493e5eSLan Tianyu PM_QOS_FLAG_NO_POWER_OFF); 3022ad493e5eSLan Tianyu if (!udev->do_remote_wakeup 3023ad493e5eSLan Tianyu && pm_qos_stat != PM_QOS_FLAGS_ALL 3024ad493e5eSLan Tianyu && udev->persist_enabled 3025ad493e5eSLan Tianyu && !status) { 3026ad493e5eSLan Tianyu pm_runtime_put_sync(&port_dev->dev); 3027ad493e5eSLan Tianyu port_dev->did_runtime_put = true; 3028ad493e5eSLan Tianyu } 3029ad493e5eSLan Tianyu 3030c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 30314956eccdSAlan Stern return status; 30321da177e4SLinus Torvalds } 3033f3f3253dSDavid Brownell 30341da177e4SLinus Torvalds /* 3035390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 3036390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 303754515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 30381da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 30391da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 30401da177e4SLinus Torvalds * in the tree that's rooted at this device. 304154515fe5SAlan Stern * 304254515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 304354515fe5SAlan Stern * status check is done. 30441da177e4SLinus Torvalds */ 3045140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 30461da177e4SLinus Torvalds { 304754515fe5SAlan Stern int status = 0; 304807e72b95SOliver Neukum u16 devstatus = 0; 30491da177e4SLinus Torvalds 30501da177e4SLinus Torvalds /* caller owns the udev device lock */ 3051b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 3052b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 30531da177e4SLinus Torvalds 30541da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 30551da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 30561da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 30571da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 30581da177e4SLinus Torvalds */ 30591da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 30601da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 30611da177e4SLinus Torvalds : USB_STATE_ADDRESS); 30621da177e4SLinus Torvalds 306354515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 306454515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 306554515fe5SAlan Stern * operation is carried out here, after the port has been 306654515fe5SAlan Stern * resumed. 306754515fe5SAlan Stern */ 306854515fe5SAlan Stern if (udev->reset_resume) 306986c57edfSAlan Stern retry_reset_resume: 3070742120c6SMing Lei status = usb_reset_and_verify_device(udev); 307154515fe5SAlan Stern 30721da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 30731da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 30741da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 30751da177e4SLinus Torvalds */ 307654515fe5SAlan Stern if (status == 0) { 307746dede46SAlan Stern devstatus = 0; 30781da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 3079b40b7a90SAlan Stern if (status >= 0) 308046dede46SAlan Stern status = (status > 0 ? 0 : -ENODEV); 308186c57edfSAlan Stern 308286c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 308386c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 308486c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 308586c57edfSAlan Stern udev->reset_resume = 1; 308686c57edfSAlan Stern goto retry_reset_resume; 308786c57edfSAlan Stern } 308854515fe5SAlan Stern } 3089b40b7a90SAlan Stern 3090624d6c07SAlan Stern if (status) { 3091624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 30921da177e4SLinus Torvalds status); 309307e72b95SOliver Neukum /* 309407e72b95SOliver Neukum * There are a few quirky devices which violate the standard 309507e72b95SOliver Neukum * by claiming to have remote wakeup enabled after a reset, 309607e72b95SOliver Neukum * which crash if the feature is cleared, hence check for 309707e72b95SOliver Neukum * udev->reset_resume 309807e72b95SOliver Neukum */ 309907e72b95SOliver Neukum } else if (udev->actconfig && !udev->reset_resume) { 310054a3ac0cSLan Tianyu if (!hub_is_superspeed(udev->parent)) { 31011da177e4SLinus Torvalds le16_to_cpus(&devstatus); 310254a3ac0cSLan Tianyu if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 31031da177e4SLinus Torvalds status = usb_control_msg(udev, 31041da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 31051da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 31061da177e4SLinus Torvalds USB_RECIP_DEVICE, 31071da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 31081da177e4SLinus Torvalds NULL, 0, 31091da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 311054a3ac0cSLan Tianyu } else { 311154a3ac0cSLan Tianyu status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, 311254a3ac0cSLan Tianyu &devstatus); 311354a3ac0cSLan Tianyu le16_to_cpus(&devstatus); 311454a3ac0cSLan Tianyu if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP 311554a3ac0cSLan Tianyu | USB_INTRF_STAT_FUNC_RW)) 311654a3ac0cSLan Tianyu status = 311754a3ac0cSLan Tianyu usb_disable_function_remotewakeup(udev); 311854a3ac0cSLan Tianyu } 311954a3ac0cSLan Tianyu 3120a8e7c565SAlan Stern if (status) 3121b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 3122b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 3123b9cef6c3SWu Fengguang status); 31241da177e4SLinus Torvalds status = 0; 31251da177e4SLinus Torvalds } 31261da177e4SLinus Torvalds return status; 31271da177e4SLinus Torvalds } 31281da177e4SLinus Torvalds 3129624d6c07SAlan Stern /* 3130624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 3131624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 3132624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 3133624d6c07SAlan Stern * 3134624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 3135624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 3136624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 3137624d6c07SAlan Stern * the host and the device is the same as it was when the device 3138624d6c07SAlan Stern * suspended. 3139624d6c07SAlan Stern * 3140feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 3141feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 314254515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 314354515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 314454515fe5SAlan Stern * 314554515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 314654515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 314754515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 314854515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 314954515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 315054515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 315154515fe5SAlan Stern * made to appear as if it had not disconnected. 315254515fe5SAlan Stern * 3153742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 3154feccc30dSAlan Stern * every effort to insure that the same device is present after the 315554515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 315654515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 315754515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 315854515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 315954515fe5SAlan Stern * new card is corrupted and the system crashes. 316054515fe5SAlan Stern * 3161624d6c07SAlan Stern * Returns 0 on success, else negative errno. 3162624d6c07SAlan Stern */ 316365bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 31641da177e4SLinus Torvalds { 3165ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3166ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3167624d6c07SAlan Stern int port1 = udev->portnum; 31681da177e4SLinus Torvalds int status; 3169d25450c6SAlan Stern u16 portchange, portstatus; 3170d25450c6SAlan Stern 3171ad493e5eSLan Tianyu if (port_dev->did_runtime_put) { 3172ad493e5eSLan Tianyu status = pm_runtime_get_sync(&port_dev->dev); 3173ad493e5eSLan Tianyu port_dev->did_runtime_put = false; 3174ad493e5eSLan Tianyu if (status < 0) { 3175ad493e5eSLan Tianyu dev_dbg(&udev->dev, "can't resume usb port, status %d\n", 3176ad493e5eSLan Tianyu status); 3177ad493e5eSLan Tianyu return status; 3178ad493e5eSLan Tianyu } 3179ad493e5eSLan Tianyu } 3180ad493e5eSLan Tianyu 3181d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 3182d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 31830ed9a57eSAndiry Xu if (status == 0 && !port_is_suspended(hub, portstatus)) 3184d25450c6SAlan Stern goto SuspendCleared; 31851da177e4SLinus Torvalds 31861da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 31871da177e4SLinus Torvalds 3188d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 3189d5cbad4bSAlan Stern 31901da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 3191a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3192c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); 3193a7114230SAndiry Xu else 3194ad493e5eSLan Tianyu status = usb_clear_port_feature(hub->hdev, 31951da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 31961da177e4SLinus Torvalds if (status) { 3197624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 31981da177e4SLinus Torvalds port1, status); 31991da177e4SLinus Torvalds } else { 32001da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 3201645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 32025b1b0b81SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : "")); 32031da177e4SLinus Torvalds msleep(25); 32041da177e4SLinus Torvalds 32051da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 32061da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 32071da177e4SLinus Torvalds * sequence. 32081da177e4SLinus Torvalds */ 3209d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 321054515fe5SAlan Stern 32111da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 32121da177e4SLinus Torvalds msleep(10); 32131da177e4SLinus Torvalds } 3214b01b03f3SAlan Stern 3215b01b03f3SAlan Stern SuspendCleared: 3216b01b03f3SAlan Stern if (status == 0) { 3217bfd1e910SAlan Stern udev->port_is_suspended = 0; 3218a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 3219a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 3220ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3221a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 3222a7114230SAndiry Xu } else { 3223b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 3224ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3225b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 32261da177e4SLinus Torvalds } 3227a7114230SAndiry Xu } 32281da177e4SLinus Torvalds 3229d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 3230d5cbad4bSAlan Stern 3231b01b03f3SAlan Stern status = check_port_resume_type(udev, 3232b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 323354515fe5SAlan Stern if (status == 0) 323454515fe5SAlan Stern status = finish_port_resume(udev); 323554515fe5SAlan Stern if (status < 0) { 323654515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 323754515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 323865580b43SAndiry Xu } else { 323965580b43SAndiry Xu /* Try to enable USB2 hardware LPM */ 324065580b43SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 324165580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 32428306095fSSarah Sharp 3243f74631e3SSarah Sharp /* Try to enable USB3 LTM and LPM */ 3244f74631e3SSarah Sharp usb_enable_ltm(udev); 32458306095fSSarah Sharp usb_unlocked_enable_lpm(udev); 324654515fe5SAlan Stern } 324765580b43SAndiry Xu 32481da177e4SLinus Torvalds return status; 32491da177e4SLinus Torvalds } 32501da177e4SLinus Torvalds 325184ebc102SAlan Stern #ifdef CONFIG_PM_RUNTIME 325284ebc102SAlan Stern 32538808f00cSAlan Stern /* caller has locked udev */ 32540534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 32551da177e4SLinus Torvalds { 32561da177e4SLinus Torvalds int status = 0; 32571da177e4SLinus Torvalds 32581da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 3259645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 32609bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 32619bbdf1e0SAlan Stern if (status == 0) { 32629bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 32639bbdf1e0SAlan Stern usb_autosuspend_device(udev); 32649bbdf1e0SAlan Stern } 3265d25450c6SAlan Stern } 32661da177e4SLinus Torvalds return status; 32671da177e4SLinus Torvalds } 32681da177e4SLinus Torvalds 3269d388dab7SAlan Stern #endif 3270d388dab7SAlan Stern 3271e6f30deaSMing Lei static int check_ports_changed(struct usb_hub *hub) 3272e6f30deaSMing Lei { 3273e6f30deaSMing Lei int port1; 3274e6f30deaSMing Lei 3275e6f30deaSMing Lei for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { 3276e6f30deaSMing Lei u16 portstatus, portchange; 3277e6f30deaSMing Lei int status; 3278e6f30deaSMing Lei 3279e6f30deaSMing Lei status = hub_port_status(hub, port1, &portstatus, &portchange); 3280e6f30deaSMing Lei if (!status && portchange) 3281e6f30deaSMing Lei return 1; 3282e6f30deaSMing Lei } 3283e6f30deaSMing Lei return 0; 3284e6f30deaSMing Lei } 3285e6f30deaSMing Lei 3286db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 32871da177e4SLinus Torvalds { 32881da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 32891da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 32901da177e4SLinus Torvalds unsigned port1; 32914296c70aSSarah Sharp int status; 32921da177e4SLinus Torvalds 3293cbb33004SAlan Stern /* Warn if children aren't already suspended */ 32941da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 32951da177e4SLinus Torvalds struct usb_device *udev; 32961da177e4SLinus Torvalds 3297ff823c79SLan Tianyu udev = hub->ports[port1 - 1]->child; 32986840d255SAlan Stern if (udev && udev->can_submit) { 3299cbb33004SAlan Stern dev_warn(&intf->dev, "port %d nyet suspended\n", port1); 33005b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 3301c9f89fa4SDavid Brownell return -EBUSY; 3302c9f89fa4SDavid Brownell } 33031da177e4SLinus Torvalds } 3304e6f30deaSMing Lei 3305e6f30deaSMing Lei if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { 3306e6f30deaSMing Lei /* check if there are changes pending on hub ports */ 3307e6f30deaSMing Lei if (check_ports_changed(hub)) { 3308e6f30deaSMing Lei if (PMSG_IS_AUTO(msg)) 3309e6f30deaSMing Lei return -EBUSY; 3310e6f30deaSMing Lei pm_wakeup_event(&hdev->dev, 2000); 3311e6f30deaSMing Lei } 3312e6f30deaSMing Lei } 3313e6f30deaSMing Lei 33144296c70aSSarah Sharp if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { 33154296c70aSSarah Sharp /* Enable hub to send remote wakeup for all ports. */ 33164296c70aSSarah Sharp for (port1 = 1; port1 <= hdev->maxchild; port1++) { 33174296c70aSSarah Sharp status = set_port_feature(hdev, 33184296c70aSSarah Sharp port1 | 33194296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_CONNECT | 33204296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | 33214296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, 33224296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_MASK); 33234296c70aSSarah Sharp } 33244296c70aSSarah Sharp } 33251da177e4SLinus Torvalds 3326441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 332740f122f3SAlan Stern 3328c9f89fa4SDavid Brownell /* stop khubd and related activity */ 33294330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 3330b6f6436dSAlan Stern return 0; 33311da177e4SLinus Torvalds } 33321da177e4SLinus Torvalds 33331da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 33341da177e4SLinus Torvalds { 33351da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 33361da177e4SLinus Torvalds 33375e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3338f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 33391da177e4SLinus Torvalds return 0; 33401da177e4SLinus Torvalds } 33411da177e4SLinus Torvalds 3342b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 3343f07600cfSAlan Stern { 3344b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 3345f07600cfSAlan Stern 33465e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3347f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 3348f07600cfSAlan Stern return 0; 3349f07600cfSAlan Stern } 3350f07600cfSAlan Stern 335154515fe5SAlan Stern /** 335254515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 335354515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 335454515fe5SAlan Stern * 335554515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 335654515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 3357feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 3358feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 3359feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 3360feccc30dSAlan Stern * the others will be disconnected. 336154515fe5SAlan Stern */ 336254515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 336354515fe5SAlan Stern { 336454515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 336554515fe5SAlan Stern rhdev->reset_resume = 1; 336654515fe5SAlan Stern } 336754515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 336854515fe5SAlan Stern 33691ea7e0e8SSarah Sharp static const char * const usb3_lpm_names[] = { 33701ea7e0e8SSarah Sharp "U0", 33711ea7e0e8SSarah Sharp "U1", 33721ea7e0e8SSarah Sharp "U2", 33731ea7e0e8SSarah Sharp "U3", 33741ea7e0e8SSarah Sharp }; 33751ea7e0e8SSarah Sharp 33761ea7e0e8SSarah Sharp /* 33771ea7e0e8SSarah Sharp * Send a Set SEL control transfer to the device, prior to enabling 33781ea7e0e8SSarah Sharp * device-initiated U1 or U2. This lets the device know the exit latencies from 33791ea7e0e8SSarah Sharp * the time the device initiates a U1 or U2 exit, to the time it will receive a 33801ea7e0e8SSarah Sharp * packet from the host. 33811ea7e0e8SSarah Sharp * 33821ea7e0e8SSarah Sharp * This function will fail if the SEL or PEL values for udev are greater than 33831ea7e0e8SSarah Sharp * the maximum allowed values for the link state to be enabled. 33841ea7e0e8SSarah Sharp */ 33851ea7e0e8SSarah Sharp static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) 33861ea7e0e8SSarah Sharp { 33871ea7e0e8SSarah Sharp struct usb_set_sel_req *sel_values; 33881ea7e0e8SSarah Sharp unsigned long long u1_sel; 33891ea7e0e8SSarah Sharp unsigned long long u1_pel; 33901ea7e0e8SSarah Sharp unsigned long long u2_sel; 33911ea7e0e8SSarah Sharp unsigned long long u2_pel; 33921ea7e0e8SSarah Sharp int ret; 33931ea7e0e8SSarah Sharp 33941ea7e0e8SSarah Sharp /* Convert SEL and PEL stored in ns to us */ 33951ea7e0e8SSarah Sharp u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); 33961ea7e0e8SSarah Sharp u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); 33971ea7e0e8SSarah Sharp u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); 33981ea7e0e8SSarah Sharp u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); 33991ea7e0e8SSarah Sharp 34001ea7e0e8SSarah Sharp /* 34011ea7e0e8SSarah Sharp * Make sure that the calculated SEL and PEL values for the link 34021ea7e0e8SSarah Sharp * state we're enabling aren't bigger than the max SEL/PEL 34031ea7e0e8SSarah Sharp * value that will fit in the SET SEL control transfer. 34041ea7e0e8SSarah Sharp * Otherwise the device would get an incorrect idea of the exit 34051ea7e0e8SSarah Sharp * latency for the link state, and could start a device-initiated 34061ea7e0e8SSarah Sharp * U1/U2 when the exit latencies are too high. 34071ea7e0e8SSarah Sharp */ 34081ea7e0e8SSarah Sharp if ((state == USB3_LPM_U1 && 34091ea7e0e8SSarah Sharp (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || 34101ea7e0e8SSarah Sharp u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || 34111ea7e0e8SSarah Sharp (state == USB3_LPM_U2 && 34121ea7e0e8SSarah Sharp (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || 34131ea7e0e8SSarah Sharp u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { 34141510a1a2SSarah Sharp dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", 34151ea7e0e8SSarah Sharp usb3_lpm_names[state], u1_sel, u1_pel); 34161ea7e0e8SSarah Sharp return -EINVAL; 34171ea7e0e8SSarah Sharp } 34181ea7e0e8SSarah Sharp 34191ea7e0e8SSarah Sharp /* 34201ea7e0e8SSarah Sharp * If we're enabling device-initiated LPM for one link state, 34211ea7e0e8SSarah Sharp * but the other link state has a too high SEL or PEL value, 34221ea7e0e8SSarah Sharp * just set those values to the max in the Set SEL request. 34231ea7e0e8SSarah Sharp */ 34241ea7e0e8SSarah Sharp if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) 34251ea7e0e8SSarah Sharp u1_sel = USB3_LPM_MAX_U1_SEL_PEL; 34261ea7e0e8SSarah Sharp 34271ea7e0e8SSarah Sharp if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) 34281ea7e0e8SSarah Sharp u1_pel = USB3_LPM_MAX_U1_SEL_PEL; 34291ea7e0e8SSarah Sharp 34301ea7e0e8SSarah Sharp if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) 34311ea7e0e8SSarah Sharp u2_sel = USB3_LPM_MAX_U2_SEL_PEL; 34321ea7e0e8SSarah Sharp 34331ea7e0e8SSarah Sharp if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) 34341ea7e0e8SSarah Sharp u2_pel = USB3_LPM_MAX_U2_SEL_PEL; 34351ea7e0e8SSarah Sharp 34361ea7e0e8SSarah Sharp /* 34371ea7e0e8SSarah Sharp * usb_enable_lpm() can be called as part of a failed device reset, 34381ea7e0e8SSarah Sharp * which may be initiated by an error path of a mass storage driver. 34391ea7e0e8SSarah Sharp * Therefore, use GFP_NOIO. 34401ea7e0e8SSarah Sharp */ 34411ea7e0e8SSarah Sharp sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); 34421ea7e0e8SSarah Sharp if (!sel_values) 34431ea7e0e8SSarah Sharp return -ENOMEM; 34441ea7e0e8SSarah Sharp 34451ea7e0e8SSarah Sharp sel_values->u1_sel = u1_sel; 34461ea7e0e8SSarah Sharp sel_values->u1_pel = u1_pel; 34471ea7e0e8SSarah Sharp sel_values->u2_sel = cpu_to_le16(u2_sel); 34481ea7e0e8SSarah Sharp sel_values->u2_pel = cpu_to_le16(u2_pel); 34491ea7e0e8SSarah Sharp 34501ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 34511ea7e0e8SSarah Sharp USB_REQ_SET_SEL, 34521ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 34531ea7e0e8SSarah Sharp 0, 0, 34541ea7e0e8SSarah Sharp sel_values, sizeof *(sel_values), 34551ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 34561ea7e0e8SSarah Sharp kfree(sel_values); 34571ea7e0e8SSarah Sharp return ret; 34581ea7e0e8SSarah Sharp } 34591ea7e0e8SSarah Sharp 34601ea7e0e8SSarah Sharp /* 34611ea7e0e8SSarah Sharp * Enable or disable device-initiated U1 or U2 transitions. 34621ea7e0e8SSarah Sharp */ 34631ea7e0e8SSarah Sharp static int usb_set_device_initiated_lpm(struct usb_device *udev, 34641ea7e0e8SSarah Sharp enum usb3_link_state state, bool enable) 34651ea7e0e8SSarah Sharp { 34661ea7e0e8SSarah Sharp int ret; 34671ea7e0e8SSarah Sharp int feature; 34681ea7e0e8SSarah Sharp 34691ea7e0e8SSarah Sharp switch (state) { 34701ea7e0e8SSarah Sharp case USB3_LPM_U1: 34711ea7e0e8SSarah Sharp feature = USB_DEVICE_U1_ENABLE; 34721ea7e0e8SSarah Sharp break; 34731ea7e0e8SSarah Sharp case USB3_LPM_U2: 34741ea7e0e8SSarah Sharp feature = USB_DEVICE_U2_ENABLE; 34751ea7e0e8SSarah Sharp break; 34761ea7e0e8SSarah Sharp default: 34771ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", 34781ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable"); 34791ea7e0e8SSarah Sharp return -EINVAL; 34801ea7e0e8SSarah Sharp } 34811ea7e0e8SSarah Sharp 34821ea7e0e8SSarah Sharp if (udev->state != USB_STATE_CONFIGURED) { 34831ea7e0e8SSarah Sharp dev_dbg(&udev->dev, "%s: Can't %s %s state " 34841ea7e0e8SSarah Sharp "for unconfigured device.\n", 34851ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable", 34861ea7e0e8SSarah Sharp usb3_lpm_names[state]); 34871ea7e0e8SSarah Sharp return 0; 34881ea7e0e8SSarah Sharp } 34891ea7e0e8SSarah Sharp 34901ea7e0e8SSarah Sharp if (enable) { 34911ea7e0e8SSarah Sharp /* 34921ea7e0e8SSarah Sharp * Now send the control transfer to enable device-initiated LPM 34931ea7e0e8SSarah Sharp * for either U1 or U2. 34941ea7e0e8SSarah Sharp */ 34951ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 34961ea7e0e8SSarah Sharp USB_REQ_SET_FEATURE, 34971ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 34981ea7e0e8SSarah Sharp feature, 34991ea7e0e8SSarah Sharp 0, NULL, 0, 35001ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 35011ea7e0e8SSarah Sharp } else { 35021ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 35031ea7e0e8SSarah Sharp USB_REQ_CLEAR_FEATURE, 35041ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 35051ea7e0e8SSarah Sharp feature, 35061ea7e0e8SSarah Sharp 0, NULL, 0, 35071ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 35081ea7e0e8SSarah Sharp } 35091ea7e0e8SSarah Sharp if (ret < 0) { 35101ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", 35111ea7e0e8SSarah Sharp enable ? "Enable" : "Disable", 35121ea7e0e8SSarah Sharp usb3_lpm_names[state]); 35131ea7e0e8SSarah Sharp return -EBUSY; 35141ea7e0e8SSarah Sharp } 35151ea7e0e8SSarah Sharp return 0; 35161ea7e0e8SSarah Sharp } 35171ea7e0e8SSarah Sharp 35181ea7e0e8SSarah Sharp static int usb_set_lpm_timeout(struct usb_device *udev, 35191ea7e0e8SSarah Sharp enum usb3_link_state state, int timeout) 35201ea7e0e8SSarah Sharp { 35211ea7e0e8SSarah Sharp int ret; 35221ea7e0e8SSarah Sharp int feature; 35231ea7e0e8SSarah Sharp 35241ea7e0e8SSarah Sharp switch (state) { 35251ea7e0e8SSarah Sharp case USB3_LPM_U1: 35261ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 35271ea7e0e8SSarah Sharp break; 35281ea7e0e8SSarah Sharp case USB3_LPM_U2: 35291ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 35301ea7e0e8SSarah Sharp break; 35311ea7e0e8SSarah Sharp default: 35321ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", 35331ea7e0e8SSarah Sharp __func__); 35341ea7e0e8SSarah Sharp return -EINVAL; 35351ea7e0e8SSarah Sharp } 35361ea7e0e8SSarah Sharp 35371ea7e0e8SSarah Sharp if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && 35381ea7e0e8SSarah Sharp timeout != USB3_LPM_DEVICE_INITIATED) { 35391ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " 35401ea7e0e8SSarah Sharp "which is a reserved value.\n", 35411ea7e0e8SSarah Sharp usb3_lpm_names[state], timeout); 35421ea7e0e8SSarah Sharp return -EINVAL; 35431ea7e0e8SSarah Sharp } 35441ea7e0e8SSarah Sharp 35451ea7e0e8SSarah Sharp ret = set_port_feature(udev->parent, 35461ea7e0e8SSarah Sharp USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, 35471ea7e0e8SSarah Sharp feature); 35481ea7e0e8SSarah Sharp if (ret < 0) { 35491ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," 35501ea7e0e8SSarah Sharp "error code %i\n", usb3_lpm_names[state], 35511ea7e0e8SSarah Sharp timeout, ret); 35521ea7e0e8SSarah Sharp return -EBUSY; 35531ea7e0e8SSarah Sharp } 35541ea7e0e8SSarah Sharp if (state == USB3_LPM_U1) 35551ea7e0e8SSarah Sharp udev->u1_params.timeout = timeout; 35561ea7e0e8SSarah Sharp else 35571ea7e0e8SSarah Sharp udev->u2_params.timeout = timeout; 35581ea7e0e8SSarah Sharp return 0; 35591ea7e0e8SSarah Sharp } 35601ea7e0e8SSarah Sharp 35611ea7e0e8SSarah Sharp /* 35621ea7e0e8SSarah Sharp * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated 35631ea7e0e8SSarah Sharp * U1/U2 entry. 35641ea7e0e8SSarah Sharp * 35651ea7e0e8SSarah Sharp * We will attempt to enable U1 or U2, but there are no guarantees that the 35661ea7e0e8SSarah Sharp * control transfers to set the hub timeout or enable device-initiated U1/U2 35671ea7e0e8SSarah Sharp * will be successful. 35681ea7e0e8SSarah Sharp * 35691ea7e0e8SSarah Sharp * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI 35701ea7e0e8SSarah Sharp * driver know about it. If that call fails, it should be harmless, and just 35711ea7e0e8SSarah Sharp * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. 35721ea7e0e8SSarah Sharp */ 35731ea7e0e8SSarah Sharp static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 35741ea7e0e8SSarah Sharp enum usb3_link_state state) 35751ea7e0e8SSarah Sharp { 357665a95b75SSarah Sharp int timeout, ret; 3577ae8963adSSarah Sharp __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; 3578ae8963adSSarah Sharp __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; 3579ae8963adSSarah Sharp 3580ae8963adSSarah Sharp /* If the device says it doesn't have *any* exit latency to come out of 3581ae8963adSSarah Sharp * U1 or U2, it's probably lying. Assume it doesn't implement that link 3582ae8963adSSarah Sharp * state. 3583ae8963adSSarah Sharp */ 3584ae8963adSSarah Sharp if ((state == USB3_LPM_U1 && u1_mel == 0) || 3585ae8963adSSarah Sharp (state == USB3_LPM_U2 && u2_mel == 0)) 3586ae8963adSSarah Sharp return; 35871ea7e0e8SSarah Sharp 358865a95b75SSarah Sharp /* 358965a95b75SSarah Sharp * First, let the device know about the exit latencies 359065a95b75SSarah Sharp * associated with the link state we're about to enable. 359165a95b75SSarah Sharp */ 359265a95b75SSarah Sharp ret = usb_req_set_sel(udev, state); 359365a95b75SSarah Sharp if (ret < 0) { 359465a95b75SSarah Sharp dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", 359565a95b75SSarah Sharp usb3_lpm_names[state]); 359665a95b75SSarah Sharp return; 359765a95b75SSarah Sharp } 359865a95b75SSarah Sharp 35991ea7e0e8SSarah Sharp /* We allow the host controller to set the U1/U2 timeout internally 36001ea7e0e8SSarah Sharp * first, so that it can change its schedule to account for the 36011ea7e0e8SSarah Sharp * additional latency to send data to a device in a lower power 36021ea7e0e8SSarah Sharp * link state. 36031ea7e0e8SSarah Sharp */ 36041ea7e0e8SSarah Sharp timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); 36051ea7e0e8SSarah Sharp 36061ea7e0e8SSarah Sharp /* xHCI host controller doesn't want to enable this LPM state. */ 36071ea7e0e8SSarah Sharp if (timeout == 0) 36081ea7e0e8SSarah Sharp return; 36091ea7e0e8SSarah Sharp 36101ea7e0e8SSarah Sharp if (timeout < 0) { 36111ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not enable %s link state, " 36121ea7e0e8SSarah Sharp "xHCI error %i.\n", usb3_lpm_names[state], 36131ea7e0e8SSarah Sharp timeout); 36141ea7e0e8SSarah Sharp return; 36151ea7e0e8SSarah Sharp } 36161ea7e0e8SSarah Sharp 36171ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, timeout)) 36181ea7e0e8SSarah Sharp /* If we can't set the parent hub U1/U2 timeout, 36191ea7e0e8SSarah Sharp * device-initiated LPM won't be allowed either, so let the xHCI 36201ea7e0e8SSarah Sharp * host know that this link state won't be enabled. 36211ea7e0e8SSarah Sharp */ 36221ea7e0e8SSarah Sharp hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); 36231ea7e0e8SSarah Sharp 36241ea7e0e8SSarah Sharp /* Only a configured device will accept the Set Feature U1/U2_ENABLE */ 36251ea7e0e8SSarah Sharp else if (udev->actconfig) 36261ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, true); 36271ea7e0e8SSarah Sharp 36281ea7e0e8SSarah Sharp } 36291ea7e0e8SSarah Sharp 36301ea7e0e8SSarah Sharp /* 36311ea7e0e8SSarah Sharp * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated 36321ea7e0e8SSarah Sharp * U1/U2 entry. 36331ea7e0e8SSarah Sharp * 36341ea7e0e8SSarah Sharp * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. 36351ea7e0e8SSarah Sharp * If zero is returned, the parent will not allow the link to go into U1/U2. 36361ea7e0e8SSarah Sharp * 36371ea7e0e8SSarah Sharp * If zero is returned, device-initiated U1/U2 entry may still be enabled, but 36381ea7e0e8SSarah Sharp * it won't have an effect on the bus link state because the parent hub will 36391ea7e0e8SSarah Sharp * still disallow device-initiated U1/U2 entry. 36401ea7e0e8SSarah Sharp * 36411ea7e0e8SSarah Sharp * If zero is returned, the xHCI host controller may still think U1/U2 entry is 36421ea7e0e8SSarah Sharp * possible. The result will be slightly more bus bandwidth will be taken up 36431ea7e0e8SSarah Sharp * (to account for U1/U2 exit latency), but it should be harmless. 36441ea7e0e8SSarah Sharp */ 36451ea7e0e8SSarah Sharp static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 36461ea7e0e8SSarah Sharp enum usb3_link_state state) 36471ea7e0e8SSarah Sharp { 36481ea7e0e8SSarah Sharp int feature; 36491ea7e0e8SSarah Sharp 36501ea7e0e8SSarah Sharp switch (state) { 36511ea7e0e8SSarah Sharp case USB3_LPM_U1: 36521ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 36531ea7e0e8SSarah Sharp break; 36541ea7e0e8SSarah Sharp case USB3_LPM_U2: 36551ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 36561ea7e0e8SSarah Sharp break; 36571ea7e0e8SSarah Sharp default: 36581ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", 36591ea7e0e8SSarah Sharp __func__); 36601ea7e0e8SSarah Sharp return -EINVAL; 36611ea7e0e8SSarah Sharp } 36621ea7e0e8SSarah Sharp 36631ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, 0)) 36641ea7e0e8SSarah Sharp return -EBUSY; 36651ea7e0e8SSarah Sharp 36661ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, false); 36671ea7e0e8SSarah Sharp 36681ea7e0e8SSarah Sharp if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) 36691ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " 36701ea7e0e8SSarah Sharp "bus schedule bandwidth may be impacted.\n", 36711ea7e0e8SSarah Sharp usb3_lpm_names[state]); 36721ea7e0e8SSarah Sharp return 0; 36731ea7e0e8SSarah Sharp } 36741ea7e0e8SSarah Sharp 36751ea7e0e8SSarah Sharp /* 36761ea7e0e8SSarah Sharp * Disable hub-initiated and device-initiated U1 and U2 entry. 36771ea7e0e8SSarah Sharp * Caller must own the bandwidth_mutex. 36781ea7e0e8SSarah Sharp * 36791ea7e0e8SSarah Sharp * This will call usb_enable_lpm() on failure, which will decrement 36801ea7e0e8SSarah Sharp * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. 36811ea7e0e8SSarah Sharp */ 36821ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 36831ea7e0e8SSarah Sharp { 36841ea7e0e8SSarah Sharp struct usb_hcd *hcd; 36851ea7e0e8SSarah Sharp 36861ea7e0e8SSarah Sharp if (!udev || !udev->parent || 36871ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 36881ea7e0e8SSarah Sharp !udev->lpm_capable) 36891ea7e0e8SSarah Sharp return 0; 36901ea7e0e8SSarah Sharp 36911ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 36921ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) 36931ea7e0e8SSarah Sharp return 0; 36941ea7e0e8SSarah Sharp 36951ea7e0e8SSarah Sharp udev->lpm_disable_count++; 369655558c33SDan Carpenter if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) 36971ea7e0e8SSarah Sharp return 0; 36981ea7e0e8SSarah Sharp 36991ea7e0e8SSarah Sharp /* If LPM is enabled, attempt to disable it. */ 37001ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) 37011ea7e0e8SSarah Sharp goto enable_lpm; 37021ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) 37031ea7e0e8SSarah Sharp goto enable_lpm; 37041ea7e0e8SSarah Sharp 37051ea7e0e8SSarah Sharp return 0; 37061ea7e0e8SSarah Sharp 37071ea7e0e8SSarah Sharp enable_lpm: 37081ea7e0e8SSarah Sharp usb_enable_lpm(udev); 37091ea7e0e8SSarah Sharp return -EBUSY; 37101ea7e0e8SSarah Sharp } 37111ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 37121ea7e0e8SSarah Sharp 37131ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ 37141ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 37151ea7e0e8SSarah Sharp { 37161ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 37171ea7e0e8SSarah Sharp int ret; 37181ea7e0e8SSarah Sharp 37191ea7e0e8SSarah Sharp if (!hcd) 37201ea7e0e8SSarah Sharp return -EINVAL; 37211ea7e0e8SSarah Sharp 37221ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 37231ea7e0e8SSarah Sharp ret = usb_disable_lpm(udev); 37241ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 37251ea7e0e8SSarah Sharp 37261ea7e0e8SSarah Sharp return ret; 37271ea7e0e8SSarah Sharp } 37281ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 37291ea7e0e8SSarah Sharp 37301ea7e0e8SSarah Sharp /* 37311ea7e0e8SSarah Sharp * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The 37321ea7e0e8SSarah Sharp * xHCI host policy may prevent U1 or U2 from being enabled. 37331ea7e0e8SSarah Sharp * 37341ea7e0e8SSarah Sharp * Other callers may have disabled link PM, so U1 and U2 entry will be disabled 37351ea7e0e8SSarah Sharp * until the lpm_disable_count drops to zero. Caller must own the 37361ea7e0e8SSarah Sharp * bandwidth_mutex. 37371ea7e0e8SSarah Sharp */ 37381ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) 37391ea7e0e8SSarah Sharp { 37401ea7e0e8SSarah Sharp struct usb_hcd *hcd; 37411ea7e0e8SSarah Sharp 37421ea7e0e8SSarah Sharp if (!udev || !udev->parent || 37431ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 37441ea7e0e8SSarah Sharp !udev->lpm_capable) 37451ea7e0e8SSarah Sharp return; 37461ea7e0e8SSarah Sharp 37471ea7e0e8SSarah Sharp udev->lpm_disable_count--; 37481ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 37491ea7e0e8SSarah Sharp /* Double check that we can both enable and disable LPM. 37501ea7e0e8SSarah Sharp * Device must be configured to accept set feature U1/U2 timeout. 37511ea7e0e8SSarah Sharp */ 37521ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || 37531ea7e0e8SSarah Sharp !hcd->driver->disable_usb3_lpm_timeout) 37541ea7e0e8SSarah Sharp return; 37551ea7e0e8SSarah Sharp 37561ea7e0e8SSarah Sharp if (udev->lpm_disable_count > 0) 37571ea7e0e8SSarah Sharp return; 37581ea7e0e8SSarah Sharp 37591ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U1); 37601ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U2); 37611ea7e0e8SSarah Sharp } 37621ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 37631ea7e0e8SSarah Sharp 37641ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ 37651ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) 37661ea7e0e8SSarah Sharp { 37671ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 37681ea7e0e8SSarah Sharp 37691ea7e0e8SSarah Sharp if (!hcd) 37701ea7e0e8SSarah Sharp return; 37711ea7e0e8SSarah Sharp 37721ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 37731ea7e0e8SSarah Sharp usb_enable_lpm(udev); 37741ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 37751ea7e0e8SSarah Sharp } 37761ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 37771ea7e0e8SSarah Sharp 37781ea7e0e8SSarah Sharp 3779d388dab7SAlan Stern #else /* CONFIG_PM */ 3780d388dab7SAlan Stern 3781511366daSAndrew Morton #define hub_suspend NULL 3782511366daSAndrew Morton #define hub_resume NULL 3783f07600cfSAlan Stern #define hub_reset_resume NULL 37841ea7e0e8SSarah Sharp 37851ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 37861ea7e0e8SSarah Sharp { 37871ea7e0e8SSarah Sharp return 0; 37881ea7e0e8SSarah Sharp } 3789e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 37901ea7e0e8SSarah Sharp 37911ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) { } 3792e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 37931ea7e0e8SSarah Sharp 37941ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 37951ea7e0e8SSarah Sharp { 37961ea7e0e8SSarah Sharp return 0; 37971ea7e0e8SSarah Sharp } 3798e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 37991ea7e0e8SSarah Sharp 38001ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) { } 3801e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 3802f74631e3SSarah Sharp 3803f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 3804f74631e3SSarah Sharp { 3805f74631e3SSarah Sharp return 0; 3806f74631e3SSarah Sharp } 3807f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 3808f74631e3SSarah Sharp 3809f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) { } 3810f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 3811c4b51a43SAlan Stern 3812c4b51a43SAlan Stern #endif /* CONFIG_PM */ 3813d388dab7SAlan Stern 38141da177e4SLinus Torvalds 38151da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 38161da177e4SLinus Torvalds * 38171da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 38181da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 38191da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 38201da177e4SLinus Torvalds * 38211da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 38221da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 38231da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 38241da177e4SLinus Torvalds * 38251da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 38261da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 38271da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 38281da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 38291da177e4SLinus Torvalds */ 3830ad493e5eSLan Tianyu int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) 38311da177e4SLinus Torvalds { 38321da177e4SLinus Torvalds int ret; 38331da177e4SLinus Torvalds int total_time, stable_time = 0; 38341da177e4SLinus Torvalds u16 portchange, portstatus; 38351da177e4SLinus Torvalds unsigned connection = 0xffff; 38361da177e4SLinus Torvalds 38371da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 38381da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 38391da177e4SLinus Torvalds if (ret < 0) 38401da177e4SLinus Torvalds return ret; 38411da177e4SLinus Torvalds 38421da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 38431da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 3844ad493e5eSLan Tianyu if (!must_be_connected || 3845ad493e5eSLan Tianyu (connection == USB_PORT_STAT_CONNECTION)) 38461da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 38471da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 38481da177e4SLinus Torvalds break; 38491da177e4SLinus Torvalds } else { 38501da177e4SLinus Torvalds stable_time = 0; 38511da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 38521da177e4SLinus Torvalds } 38531da177e4SLinus Torvalds 38541da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 3855ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 38561da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 38571da177e4SLinus Torvalds } 38581da177e4SLinus Torvalds 38591da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 38601da177e4SLinus Torvalds break; 38611da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 38621da177e4SLinus Torvalds } 38631da177e4SLinus Torvalds 38641da177e4SLinus Torvalds dev_dbg (hub->intfdev, 38651da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 38661da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 38671da177e4SLinus Torvalds 38681da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 38691da177e4SLinus Torvalds return -ETIMEDOUT; 38701da177e4SLinus Torvalds return portstatus; 38711da177e4SLinus Torvalds } 38721da177e4SLinus Torvalds 3873fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 38741da177e4SLinus Torvalds { 3875ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 3876ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 38772caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 38781da177e4SLinus Torvalds } 3879fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 38801da177e4SLinus Torvalds 38811da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 38821da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 38831da177e4SLinus Torvalds 38844326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 38851da177e4SLinus Torvalds { 38861da177e4SLinus Torvalds int retval; 3887c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 38881da177e4SLinus Torvalds 3889c6515272SSarah Sharp /* 3890c6515272SSarah Sharp * The host controller will choose the device address, 3891c6515272SSarah Sharp * instead of the core having chosen it earlier 3892c6515272SSarah Sharp */ 3893c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 38941da177e4SLinus Torvalds return -EINVAL; 38951da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 38961da177e4SLinus Torvalds return 0; 38971da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 38981da177e4SLinus Torvalds return -EINVAL; 3899c8d4af8eSAndiry Xu if (hcd->driver->address_device) 3900c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 3901c8d4af8eSAndiry Xu else 39021da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 39034326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 39041da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 39051da177e4SLinus Torvalds if (retval == 0) { 39063b29b68bSAlan Stern update_devnum(udev, devnum); 39074953d141SDavid Vrabel /* Device now using proper address. */ 39081da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 3909fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 39101da177e4SLinus Torvalds } 39111da177e4SLinus Torvalds return retval; 39121da177e4SLinus Torvalds } 39131da177e4SLinus Torvalds 39141da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 39151da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 39161da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 39171da177e4SLinus Torvalds * 39181da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 3919742120c6SMing Lei * usb_reset_and_verify_device), the caller must own the device lock. For a 39201da177e4SLinus Torvalds * newly detected device that is not accessible through any global 39211da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 39221da177e4SLinus Torvalds */ 39231da177e4SLinus Torvalds static int 39241da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 39251da177e4SLinus Torvalds int retry_counter) 39261da177e4SLinus Torvalds { 39274186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 39281da177e4SLinus Torvalds 39291da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 3930e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 39311da177e4SLinus Torvalds int i, j, retval; 39321da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 39331da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 3934e538dfdaSMichal Nazarewicz const char *speed; 39354326ed0bSAlan Stern int devnum = udev->devnum; 39361da177e4SLinus Torvalds 39371da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 39381da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 39391da177e4SLinus Torvalds */ 39401da177e4SLinus Torvalds if (!hdev->parent) { 39411da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 39421da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 39431da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 39441da177e4SLinus Torvalds } 39451da177e4SLinus Torvalds 39461da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 39471da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 39481da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 39491da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 39501da177e4SLinus Torvalds 39514186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 39521da177e4SLinus Torvalds 39531da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 3954e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 395575d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 39561da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 39571da177e4SLinus Torvalds goto fail; 39581da177e4SLinus Torvalds /* success, speed is known */ 395907194ab7SLuben Tuikov 39601da177e4SLinus Torvalds retval = -ENODEV; 39611da177e4SLinus Torvalds 39621da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 39631da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 39641da177e4SLinus Torvalds goto fail; 39651da177e4SLinus Torvalds } 39661da177e4SLinus Torvalds oldspeed = udev->speed; 39671da177e4SLinus Torvalds 39681da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 39691da177e4SLinus Torvalds * it's fixed size except for full speed devices. 39705bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 39715bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 39721da177e4SLinus Torvalds */ 39731da177e4SLinus Torvalds switch (udev->speed) { 39746b403b02SSarah Sharp case USB_SPEED_SUPER: 3975551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 3976551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 39775bb6e0aeSInaky Perez-Gonzalez break; 39781da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 3979551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 39801da177e4SLinus Torvalds break; 39811da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 39821da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 39831da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 39841da177e4SLinus Torvalds * then correct our initial guess. 39851da177e4SLinus Torvalds */ 3986551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 39871da177e4SLinus Torvalds break; 39881da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 3989551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 39901da177e4SLinus Torvalds break; 39911da177e4SLinus Torvalds default: 39921da177e4SLinus Torvalds goto fail; 39931da177e4SLinus Torvalds } 39941da177e4SLinus Torvalds 3995e538dfdaSMichal Nazarewicz if (udev->speed == USB_SPEED_WIRELESS) 3996e538dfdaSMichal Nazarewicz speed = "variable speed Wireless"; 3997e538dfdaSMichal Nazarewicz else 3998e538dfdaSMichal Nazarewicz speed = usb_speed_string(udev->speed); 3999e538dfdaSMichal Nazarewicz 4000c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 400183a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 4002e538dfdaSMichal Nazarewicz "%s %s USB device number %d using %s\n", 4003e538dfdaSMichal Nazarewicz (udev->config) ? "reset" : "new", speed, 40043b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 40051da177e4SLinus Torvalds 40061da177e4SLinus Torvalds /* Set up TT records, if needed */ 40071da177e4SLinus Torvalds if (hdev->tt) { 40081da177e4SLinus Torvalds udev->tt = hdev->tt; 40091da177e4SLinus Torvalds udev->ttport = hdev->ttport; 40101da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 40111da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 4012d199c96dSAlan Stern if (!hub->tt.hub) { 4013d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 4014d199c96dSAlan Stern retval = -EINVAL; 4015d199c96dSAlan Stern goto fail; 4016d199c96dSAlan Stern } 40171da177e4SLinus Torvalds udev->tt = &hub->tt; 40181da177e4SLinus Torvalds udev->ttport = port1; 40191da177e4SLinus Torvalds } 40201da177e4SLinus Torvalds 40211da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 40221da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 40231da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 40241da177e4SLinus Torvalds * Change it cautiously. 40251da177e4SLinus Torvalds * 40261da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 40271da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 40281da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 40291da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 40301da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 40311da177e4SLinus Torvalds * value. 40321da177e4SLinus Torvalds */ 40331da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 4034c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { 40351da177e4SLinus Torvalds struct usb_device_descriptor *buf; 40361da177e4SLinus Torvalds int r = 0; 40371da177e4SLinus Torvalds 40381da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 40391da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 40401da177e4SLinus Torvalds if (!buf) { 40411da177e4SLinus Torvalds retval = -ENOMEM; 40421da177e4SLinus Torvalds continue; 40431da177e4SLinus Torvalds } 40441da177e4SLinus Torvalds 4045b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 4046b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 4047b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 40481da177e4SLinus Torvalds */ 40491da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 40501da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 40511da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 40521da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 40531da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 40541da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 4055fd7c519dSJaroslav Kysela initial_descriptor_timeout); 40561da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 40575bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 40581da177e4SLinus Torvalds if (buf->bDescriptorType == 40591da177e4SLinus Torvalds USB_DT_DEVICE) { 40601da177e4SLinus Torvalds r = 0; 40611da177e4SLinus Torvalds break; 40621da177e4SLinus Torvalds } 40631da177e4SLinus Torvalds /* FALL THROUGH */ 40641da177e4SLinus Torvalds default: 40651da177e4SLinus Torvalds if (r == 0) 40661da177e4SLinus Torvalds r = -EPROTO; 40671da177e4SLinus Torvalds break; 40681da177e4SLinus Torvalds } 40691da177e4SLinus Torvalds if (r == 0) 40701da177e4SLinus Torvalds break; 40711da177e4SLinus Torvalds } 40721da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 40731da177e4SLinus Torvalds buf->bMaxPacketSize0; 40741da177e4SLinus Torvalds kfree(buf); 40751da177e4SLinus Torvalds 407675d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 40771da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 40781da177e4SLinus Torvalds goto fail; 40791da177e4SLinus Torvalds if (oldspeed != udev->speed) { 40801da177e4SLinus Torvalds dev_dbg(&udev->dev, 40811da177e4SLinus Torvalds "device reset changed speed!\n"); 40821da177e4SLinus Torvalds retval = -ENODEV; 40831da177e4SLinus Torvalds goto fail; 40841da177e4SLinus Torvalds } 40851da177e4SLinus Torvalds if (r) { 4086e9e88fb7SAlan Stern if (r != -ENODEV) 4087e9e88fb7SAlan Stern dev_err(&udev->dev, "device descriptor read/64, error %d\n", 4088b9cef6c3SWu Fengguang r); 40891da177e4SLinus Torvalds retval = -EMSGSIZE; 40901da177e4SLinus Torvalds continue; 40911da177e4SLinus Torvalds } 40921da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 40931da177e4SLinus Torvalds } 40941da177e4SLinus Torvalds 40956c529cdcSInaky Perez-Gonzalez /* 40966c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 40976c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 40986c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 40996c529cdcSInaky Perez-Gonzalez */ 41006c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 41011da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 41024326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 41031da177e4SLinus Torvalds if (retval >= 0) 41041da177e4SLinus Torvalds break; 41051da177e4SLinus Torvalds msleep(200); 41061da177e4SLinus Torvalds } 41071da177e4SLinus Torvalds if (retval < 0) { 4108e9e88fb7SAlan Stern if (retval != -ENODEV) 4109e9e88fb7SAlan Stern dev_err(&udev->dev, "device not accepting address %d, error %d\n", 41104326ed0bSAlan Stern devnum, retval); 41111da177e4SLinus Torvalds goto fail; 41121da177e4SLinus Torvalds } 4113c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 4114c6515272SSarah Sharp devnum = udev->devnum; 4115c6515272SSarah Sharp dev_info(&udev->dev, 41163b29b68bSAlan Stern "%s SuperSpeed USB device number %d using %s\n", 4117c6515272SSarah Sharp (udev->config) ? "reset" : "new", 41183b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 4119c6515272SSarah Sharp } 41201da177e4SLinus Torvalds 41211da177e4SLinus Torvalds /* cope with hardware quirkiness: 41221da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 41231da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 41241da177e4SLinus Torvalds */ 41251da177e4SLinus Torvalds msleep(10); 4126c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) 41271da177e4SLinus Torvalds break; 41286c529cdcSInaky Perez-Gonzalez } 41291da177e4SLinus Torvalds 41301da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 41311da177e4SLinus Torvalds if (retval < 8) { 4132e9e88fb7SAlan Stern if (retval != -ENODEV) 4133b9cef6c3SWu Fengguang dev_err(&udev->dev, 4134b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 4135b9cef6c3SWu Fengguang retval); 41361da177e4SLinus Torvalds if (retval >= 0) 41371da177e4SLinus Torvalds retval = -EMSGSIZE; 41381da177e4SLinus Torvalds } else { 41391da177e4SLinus Torvalds retval = 0; 41401da177e4SLinus Torvalds break; 41411da177e4SLinus Torvalds } 41421da177e4SLinus Torvalds } 41431da177e4SLinus Torvalds if (retval) 41441da177e4SLinus Torvalds goto fail; 41451da177e4SLinus Torvalds 4146b76baa81SPeter Chen if (hcd->phy && !hdev->parent) 4147ac96511bSPeter Chen usb_phy_notify_connect(hcd->phy, udev->speed); 4148b76baa81SPeter Chen 4149d8aec3dbSElric Fu /* 4150d8aec3dbSElric Fu * Some superspeed devices have finished the link training process 4151d8aec3dbSElric Fu * and attached to a superspeed hub port, but the device descriptor 4152d8aec3dbSElric Fu * got from those devices show they aren't superspeed devices. Warm 4153d8aec3dbSElric Fu * reset the port attached by the devices can fix them. 4154d8aec3dbSElric Fu */ 4155d8aec3dbSElric Fu if ((udev->speed == USB_SPEED_SUPER) && 4156d8aec3dbSElric Fu (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { 4157d8aec3dbSElric Fu dev_err(&udev->dev, "got a wrong device descriptor, " 4158d8aec3dbSElric Fu "warm reset device\n"); 4159d8aec3dbSElric Fu hub_port_reset(hub, port1, udev, 4160d8aec3dbSElric Fu HUB_BH_RESET_TIME, true); 4161d8aec3dbSElric Fu retval = -EINVAL; 4162d8aec3dbSElric Fu goto fail; 4163d8aec3dbSElric Fu } 4164d8aec3dbSElric Fu 41656b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 41666b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 41676b403b02SSarah Sharp i = 512; 41686b403b02SSarah Sharp else 41696b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 417029cc8897SKuninori Morimoto if (usb_endpoint_maxp(&udev->ep0.desc) != i) { 417156626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 41721da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 417356626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 41741da177e4SLinus Torvalds retval = -EMSGSIZE; 41751da177e4SLinus Torvalds goto fail; 41761da177e4SLinus Torvalds } 417756626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 41781da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 417956626a72SAlan Stern else 418056626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 41811da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 4182fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 41831da177e4SLinus Torvalds } 41841da177e4SLinus Torvalds 41851da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 41861da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 4187e9e88fb7SAlan Stern if (retval != -ENODEV) 4188b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 4189b9cef6c3SWu Fengguang retval); 41901da177e4SLinus Torvalds if (retval >= 0) 41911da177e4SLinus Torvalds retval = -ENOMSG; 41921da177e4SLinus Torvalds goto fail; 41931da177e4SLinus Torvalds } 41941da177e4SLinus Torvalds 41951ff4df56SAndiry Xu if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { 41961ff4df56SAndiry Xu retval = usb_get_bos_descriptor(udev); 419751e0a012SSarah Sharp if (!retval) { 4198d9b2099cSSarah Sharp udev->lpm_capable = usb_device_supports_lpm(udev); 419951e0a012SSarah Sharp usb_set_lpm_parameters(udev); 420051e0a012SSarah Sharp } 42011ff4df56SAndiry Xu } 42023148bf04SAndiry Xu 42031da177e4SLinus Torvalds retval = 0; 420448f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 420548f24970SAlek Du if (hcd->driver->update_device) 420648f24970SAlek Du hcd->driver->update_device(hcd, udev); 42071da177e4SLinus Torvalds fail: 42084326ed0bSAlan Stern if (retval) { 42091da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 42103b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 42114326ed0bSAlan Stern } 42124186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 42131da177e4SLinus Torvalds return retval; 42141da177e4SLinus Torvalds } 42151da177e4SLinus Torvalds 42161da177e4SLinus Torvalds static void 42171da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 42181da177e4SLinus Torvalds { 42191da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 42201da177e4SLinus Torvalds int status; 42211da177e4SLinus Torvalds 4222e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 42231da177e4SLinus Torvalds if (qual == NULL) 42241da177e4SLinus Torvalds return; 42251da177e4SLinus Torvalds 42261da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 42271da177e4SLinus Torvalds qual, sizeof *qual); 42281da177e4SLinus Torvalds if (status == sizeof *qual) { 42291da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 42301da177e4SLinus Torvalds "connect to a high speed hub\n"); 42311da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 42321da177e4SLinus Torvalds if (hub->has_indicators) { 42331da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 4234c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 42351da177e4SLinus Torvalds } 42361da177e4SLinus Torvalds } 42371da177e4SLinus Torvalds kfree(qual); 42381da177e4SLinus Torvalds } 42391da177e4SLinus Torvalds 42401da177e4SLinus Torvalds static unsigned 42411da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 42421da177e4SLinus Torvalds { 42431da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 42441da177e4SLinus Torvalds int remaining; 424555c52718SAlan Stern int port1; 42461da177e4SLinus Torvalds 424755c52718SAlan Stern if (!hub->limited_power) 42481da177e4SLinus Torvalds return 0; 42491da177e4SLinus Torvalds 425055c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 425155c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 4252ff823c79SLan Tianyu struct usb_device *udev = hub->ports[port1 - 1]->child; 425355c52718SAlan Stern int delta; 4254430ee58eSSebastian Andrzej Siewior unsigned unit_load; 42551da177e4SLinus Torvalds 42561da177e4SLinus Torvalds if (!udev) 42571da177e4SLinus Torvalds continue; 4258430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(udev)) 4259430ee58eSSebastian Andrzej Siewior unit_load = 150; 4260430ee58eSSebastian Andrzej Siewior else 4261430ee58eSSebastian Andrzej Siewior unit_load = 100; 42621da177e4SLinus Torvalds 4263430ee58eSSebastian Andrzej Siewior /* 4264430ee58eSSebastian Andrzej Siewior * Unconfigured devices may not use more than one unit load, 4265430ee58eSSebastian Andrzej Siewior * or 8mA for OTG ports 4266430ee58eSSebastian Andrzej Siewior */ 42671da177e4SLinus Torvalds if (udev->actconfig) 42688d8479dbSSebastian Andrzej Siewior delta = usb_get_max_power(udev, udev->actconfig); 426955c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 4270430ee58eSSebastian Andrzej Siewior delta = unit_load; 42711da177e4SLinus Torvalds else 427255c52718SAlan Stern delta = 8; 427355c52718SAlan Stern if (delta > hub->mA_per_port) 4274b9cef6c3SWu Fengguang dev_warn(&udev->dev, 4275b9cef6c3SWu Fengguang "%dmA is over %umA budget for port %d!\n", 427655c52718SAlan Stern delta, hub->mA_per_port, port1); 42771da177e4SLinus Torvalds remaining -= delta; 42781da177e4SLinus Torvalds } 42791da177e4SLinus Torvalds if (remaining < 0) { 428055c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 428155c52718SAlan Stern - remaining); 42821da177e4SLinus Torvalds remaining = 0; 42831da177e4SLinus Torvalds } 42841da177e4SLinus Torvalds return remaining; 42851da177e4SLinus Torvalds } 42861da177e4SLinus Torvalds 42871da177e4SLinus Torvalds /* Handle physical or logical connection change events. 42881da177e4SLinus Torvalds * This routine is called when: 42891da177e4SLinus Torvalds * a port connection-change occurs; 42901da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 4291742120c6SMing Lei * usb_reset_and_verify_device() encounters changed descriptors (as from 42921da177e4SLinus Torvalds * a firmware download) 42931da177e4SLinus Torvalds * caller already locked the hub 42941da177e4SLinus Torvalds */ 42951da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 42961da177e4SLinus Torvalds u16 portstatus, u16 portchange) 42971da177e4SLinus Torvalds { 42981da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 42991da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 430090da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 430124618b0cSAlan Stern unsigned wHubCharacteristics = 430224618b0cSAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 43038808f00cSAlan Stern struct usb_device *udev; 43041da177e4SLinus Torvalds int status, i; 4305430ee58eSSebastian Andrzej Siewior unsigned unit_load; 43061da177e4SLinus Torvalds 43071da177e4SLinus Torvalds dev_dbg (hub_dev, 43081da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 4309131dec34SSarah Sharp port1, portstatus, portchange, portspeed(hub, portstatus)); 43101da177e4SLinus Torvalds 43111da177e4SLinus Torvalds if (hub->has_indicators) { 43121da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 43131da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 43141da177e4SLinus Torvalds } 43151da177e4SLinus Torvalds 43161da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 43171da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 43181da177e4SLinus Torvalds if (hdev->bus->is_b_host) 431924618b0cSAlan Stern portchange &= ~(USB_PORT_STAT_C_CONNECTION | 432024618b0cSAlan Stern USB_PORT_STAT_C_ENABLE); 43211da177e4SLinus Torvalds #endif 43221da177e4SLinus Torvalds 43238808f00cSAlan Stern /* Try to resuscitate an existing device */ 4324ff823c79SLan Tianyu udev = hub->ports[port1 - 1]->child; 43258808f00cSAlan Stern if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 43268808f00cSAlan Stern udev->state != USB_STATE_NOTATTACHED) { 43278808f00cSAlan Stern usb_lock_device(udev); 43288808f00cSAlan Stern if (portstatus & USB_PORT_STAT_ENABLE) { 43298808f00cSAlan Stern status = 0; /* Nothing to do */ 43308808f00cSAlan Stern 433184ebc102SAlan Stern #ifdef CONFIG_PM_RUNTIME 43325257d97aSAlan Stern } else if (udev->state == USB_STATE_SUSPENDED && 43335257d97aSAlan Stern udev->persist_enabled) { 43348808f00cSAlan Stern /* For a suspended device, treat this as a 43358808f00cSAlan Stern * remote wakeup event. 43368808f00cSAlan Stern */ 43370534d468SAlan Stern status = usb_remote_wakeup(udev); 43388808f00cSAlan Stern #endif 43398808f00cSAlan Stern 43408808f00cSAlan Stern } else { 43415257d97aSAlan Stern status = -ENODEV; /* Don't resuscitate */ 43428808f00cSAlan Stern } 43438808f00cSAlan Stern usb_unlock_device(udev); 43448808f00cSAlan Stern 43458808f00cSAlan Stern if (status == 0) { 43468808f00cSAlan Stern clear_bit(port1, hub->change_bits); 43478808f00cSAlan Stern return; 43488808f00cSAlan Stern } 43498808f00cSAlan Stern } 43508808f00cSAlan Stern 435124618b0cSAlan Stern /* Disconnect any existing devices under this port */ 4352b76baa81SPeter Chen if (udev) { 4353b76baa81SPeter Chen if (hcd->phy && !hdev->parent && 4354b76baa81SPeter Chen !(portstatus & USB_PORT_STAT_CONNECTION)) 4355ac96511bSPeter Chen usb_phy_notify_disconnect(hcd->phy, udev->speed); 4356ff823c79SLan Tianyu usb_disconnect(&hub->ports[port1 - 1]->child); 4357b76baa81SPeter Chen } 435824618b0cSAlan Stern clear_bit(port1, hub->change_bits); 435924618b0cSAlan Stern 4360253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 4361253e0572SAlan Stern * disconnect or the connect status changes. 4362253e0572SAlan Stern */ 4363253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4364253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 4365253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 4366253e0572SAlan Stern 43675257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 43685257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 4369ad493e5eSLan Tianyu status = hub_port_debounce_be_stable(hub, port1); 43705257d97aSAlan Stern if (status < 0) { 4371e9e88fb7SAlan Stern if (status != -ENODEV && printk_ratelimit()) 43725257d97aSAlan Stern dev_err(hub_dev, "connect-debounce failed, " 43735257d97aSAlan Stern "port %d disabled\n", port1); 43745257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 43755257d97aSAlan Stern } else { 43765257d97aSAlan Stern portstatus = status; 43775257d97aSAlan Stern } 43785257d97aSAlan Stern } 43795257d97aSAlan Stern 4380253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 4381253e0572SAlan Stern * the device was "removed". 4382253e0572SAlan Stern */ 4383253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4384253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 43851da177e4SLinus Torvalds 43861da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 438774ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 43880ed9a57eSAndiry Xu && !port_is_power_on(hub, portstatus)) 43891da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 43901da177e4SLinus Torvalds 43911da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 43921da177e4SLinus Torvalds goto done; 43931da177e4SLinus Torvalds return; 43941da177e4SLinus Torvalds } 4395430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hub->hdev)) 4396430ee58eSSebastian Andrzej Siewior unit_load = 150; 4397430ee58eSSebastian Andrzej Siewior else 4398430ee58eSSebastian Andrzej Siewior unit_load = 100; 43991da177e4SLinus Torvalds 4400e9e88fb7SAlan Stern status = 0; 44011da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 44021da177e4SLinus Torvalds 44031da177e4SLinus Torvalds /* reallocate for each attempt, since references 44041da177e4SLinus Torvalds * to the previous one can escape in various ways 44051da177e4SLinus Torvalds */ 44061da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 44071da177e4SLinus Torvalds if (!udev) { 44081da177e4SLinus Torvalds dev_err (hub_dev, 44091da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 44101da177e4SLinus Torvalds port1); 44111da177e4SLinus Torvalds goto done; 44121da177e4SLinus Torvalds } 44131da177e4SLinus Torvalds 44141da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 441555c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 4416b6956ffaSAlan Stern udev->level = hdev->level + 1; 44178af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 44181da177e4SLinus Torvalds 4419131dec34SSarah Sharp /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ 4420131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 4421e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 4422e7b77172SSarah Sharp else 4423e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 4424e7b77172SSarah Sharp 44253b29b68bSAlan Stern choose_devnum(udev); 4426c6515272SSarah Sharp if (udev->devnum <= 0) { 4427c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 4428c6515272SSarah Sharp goto loop; 4429c6515272SSarah Sharp } 4430c6515272SSarah Sharp 4431e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 44321da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 44331da177e4SLinus Torvalds if (status < 0) 44341da177e4SLinus Torvalds goto loop; 44351da177e4SLinus Torvalds 443693362a87SPhil Dibowitz usb_detect_quirks(udev); 443793362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 443893362a87SPhil Dibowitz msleep(1000); 443993362a87SPhil Dibowitz 44401da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 44411da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 44421da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 44431da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 44441da177e4SLinus Torvalds * on the parent. 44451da177e4SLinus Torvalds */ 44461da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 4447430ee58eSSebastian Andrzej Siewior && udev->bus_mA <= unit_load) { 44481da177e4SLinus Torvalds u16 devstat; 44491da177e4SLinus Torvalds 44501da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 44511da177e4SLinus Torvalds &devstat); 445255c52718SAlan Stern if (status < 2) { 44531da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 44541da177e4SLinus Torvalds goto loop_disable; 44551da177e4SLinus Torvalds } 445655c52718SAlan Stern le16_to_cpus(&devstat); 44571da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 44581da177e4SLinus Torvalds dev_err(&udev->dev, 44591da177e4SLinus Torvalds "can't connect bus-powered hub " 44601da177e4SLinus Torvalds "to this port\n"); 44611da177e4SLinus Torvalds if (hub->has_indicators) { 44621da177e4SLinus Torvalds hub->indicator[port1-1] = 44631da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 4464c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 44651da177e4SLinus Torvalds } 44661da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 44671da177e4SLinus Torvalds goto loop_disable; 44681da177e4SLinus Torvalds } 44691da177e4SLinus Torvalds } 44701da177e4SLinus Torvalds 44711da177e4SLinus Torvalds /* check for devices running slower than they could */ 44721da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 44731da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 44741da177e4SLinus Torvalds && highspeed_hubs != 0) 44751da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 44761da177e4SLinus Torvalds 4477fa286188SGreg Kroah-Hartman /* Store the parent's children[] pointer. At this point 44781da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 44791da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 44801da177e4SLinus Torvalds */ 44811da177e4SLinus Torvalds status = 0; 44821da177e4SLinus Torvalds 44831da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 44841da177e4SLinus Torvalds * been disconnected; we would race with the 44851da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 44861da177e4SLinus Torvalds */ 44871da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 44881da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 44891da177e4SLinus Torvalds status = -ENOTCONN; 44901da177e4SLinus Torvalds else 4491ff823c79SLan Tianyu hub->ports[port1 - 1]->child = udev; 44921da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 44931da177e4SLinus Torvalds 44941da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 44951da177e4SLinus Torvalds if (!status) { 44961da177e4SLinus Torvalds status = usb_new_device(udev); 44971da177e4SLinus Torvalds if (status) { 44981da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 4499ff823c79SLan Tianyu hub->ports[port1 - 1]->child = NULL; 45001da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 45011da177e4SLinus Torvalds } 45021da177e4SLinus Torvalds } 45031da177e4SLinus Torvalds 45041da177e4SLinus Torvalds if (status) 45051da177e4SLinus Torvalds goto loop_disable; 45061da177e4SLinus Torvalds 45071da177e4SLinus Torvalds status = hub_power_remaining(hub); 45081da177e4SLinus Torvalds if (status) 450955c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 45101da177e4SLinus Torvalds 45111da177e4SLinus Torvalds return; 45121da177e4SLinus Torvalds 45131da177e4SLinus Torvalds loop_disable: 45141da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 45151da177e4SLinus Torvalds loop: 4516fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 45173b29b68bSAlan Stern release_devnum(udev); 4518f7410cedSHerbert Xu hub_free_dev(udev); 45191da177e4SLinus Torvalds usb_put_dev(udev); 4520ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 45211da177e4SLinus Torvalds break; 45221da177e4SLinus Torvalds } 45233a31155cSAlan Stern if (hub->hdev->parent || 45243a31155cSAlan Stern !hcd->driver->port_handed_over || 4525e9e88fb7SAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) { 4526e9e88fb7SAlan Stern if (status != -ENOTCONN && status != -ENODEV) 45273a31155cSAlan Stern dev_err(hub_dev, "unable to enumerate USB device on port %d\n", 45283a31155cSAlan Stern port1); 4529e9e88fb7SAlan Stern } 45301da177e4SLinus Torvalds 45311da177e4SLinus Torvalds done: 45321da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 453390da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 453490da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 45351da177e4SLinus Torvalds } 45361da177e4SLinus Torvalds 4537714b07beSSarah Sharp /* Returns 1 if there was a remote wakeup and a connect status change. */ 4538714b07beSSarah Sharp static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 453972937e1eSSarah Sharp u16 portstatus, u16 portchange) 4540714b07beSSarah Sharp { 4541714b07beSSarah Sharp struct usb_device *hdev; 4542714b07beSSarah Sharp struct usb_device *udev; 4543714b07beSSarah Sharp int connect_change = 0; 4544714b07beSSarah Sharp int ret; 4545714b07beSSarah Sharp 4546714b07beSSarah Sharp hdev = hub->hdev; 4547ff823c79SLan Tianyu udev = hub->ports[port - 1]->child; 45484ee823b8SSarah Sharp if (!hub_is_superspeed(hdev)) { 4549714b07beSSarah Sharp if (!(portchange & USB_PORT_STAT_C_SUSPEND)) 4550714b07beSSarah Sharp return 0; 4551ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); 45524ee823b8SSarah Sharp } else { 45534ee823b8SSarah Sharp if (!udev || udev->state != USB_STATE_SUSPENDED || 455472937e1eSSarah Sharp (portstatus & USB_PORT_STAT_LINK_STATE) != 455572937e1eSSarah Sharp USB_SS_PORT_LS_U0) 45564ee823b8SSarah Sharp return 0; 45574ee823b8SSarah Sharp } 4558714b07beSSarah Sharp 4559714b07beSSarah Sharp if (udev) { 4560714b07beSSarah Sharp /* TRSMRCY = 10 msec */ 4561714b07beSSarah Sharp msleep(10); 4562714b07beSSarah Sharp 4563714b07beSSarah Sharp usb_lock_device(udev); 4564714b07beSSarah Sharp ret = usb_remote_wakeup(udev); 4565714b07beSSarah Sharp usb_unlock_device(udev); 4566714b07beSSarah Sharp if (ret < 0) 4567714b07beSSarah Sharp connect_change = 1; 4568714b07beSSarah Sharp } else { 4569714b07beSSarah Sharp ret = -ENODEV; 4570714b07beSSarah Sharp hub_port_disable(hub, port, 1); 4571714b07beSSarah Sharp } 4572714b07beSSarah Sharp dev_dbg(hub->intfdev, "resume on port %d, status %d\n", 4573714b07beSSarah Sharp port, ret); 4574714b07beSSarah Sharp return connect_change; 4575714b07beSSarah Sharp } 4576714b07beSSarah Sharp 45771da177e4SLinus Torvalds static void hub_events(void) 45781da177e4SLinus Torvalds { 45791da177e4SLinus Torvalds struct list_head *tmp; 45801da177e4SLinus Torvalds struct usb_device *hdev; 45811da177e4SLinus Torvalds struct usb_interface *intf; 45821da177e4SLinus Torvalds struct usb_hub *hub; 45831da177e4SLinus Torvalds struct device *hub_dev; 45841da177e4SLinus Torvalds u16 hubstatus; 45851da177e4SLinus Torvalds u16 hubchange; 45861da177e4SLinus Torvalds u16 portstatus; 45871da177e4SLinus Torvalds u16 portchange; 45881da177e4SLinus Torvalds int i, ret; 45894ee823b8SSarah Sharp int connect_change, wakeup_change; 45901da177e4SLinus Torvalds 45911da177e4SLinus Torvalds /* 45921da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 45931da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 45941da177e4SLinus Torvalds * safe since we delete the hub from the event list. 45951da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 45961da177e4SLinus Torvalds */ 45971da177e4SLinus Torvalds while (1) { 45981da177e4SLinus Torvalds 45991da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 46001da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 46011da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 46021da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 46031da177e4SLinus Torvalds break; 46041da177e4SLinus Torvalds } 46051da177e4SLinus Torvalds 46061da177e4SLinus Torvalds tmp = hub_event_list.next; 46071da177e4SLinus Torvalds list_del_init(tmp); 46081da177e4SLinus Torvalds 46091da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 4610e8054854SAlan Stern kref_get(&hub->kref); 4611e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 46121da177e4SLinus Torvalds 4613e8054854SAlan Stern hdev = hub->hdev; 4614e8054854SAlan Stern hub_dev = hub->intfdev; 4615e8054854SAlan Stern intf = to_usb_interface(hub_dev); 461640f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 46171da177e4SLinus Torvalds hdev->state, hub->descriptor 46181da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 46191da177e4SLinus Torvalds : 0, 46201da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 46211da177e4SLinus Torvalds (u16) hub->change_bits[0], 462240f122f3SAlan Stern (u16) hub->event_bits[0]); 46231da177e4SLinus Torvalds 46241da177e4SLinus Torvalds /* Lock the device, then check to see if we were 46251da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 462606b84e8aSAlan Stern usb_lock_device(hdev); 4627e8054854SAlan Stern if (unlikely(hub->disconnected)) 46289bbdf1e0SAlan Stern goto loop_disconnected; 46291da177e4SLinus Torvalds 46301da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 46311da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 46327de18d8bSAlan Stern hub->error = -ENODEV; 46334330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 46341da177e4SLinus Torvalds goto loop; 46351da177e4SLinus Torvalds } 46361da177e4SLinus Torvalds 463740f122f3SAlan Stern /* Autoresume */ 463840f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 463940f122f3SAlan Stern if (ret) { 464040f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 46411da177e4SLinus Torvalds goto loop; 464240f122f3SAlan Stern } 464340f122f3SAlan Stern 464440f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 464540f122f3SAlan Stern if (hub->quiescing) 464640f122f3SAlan Stern goto loop_autopm; 46471da177e4SLinus Torvalds 46481da177e4SLinus Torvalds if (hub->error) { 46491da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 46501da177e4SLinus Torvalds hub->error); 46511da177e4SLinus Torvalds 4652742120c6SMing Lei ret = usb_reset_device(hdev); 46531da177e4SLinus Torvalds if (ret) { 46541da177e4SLinus Torvalds dev_dbg (hub_dev, 46551da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 465640f122f3SAlan Stern goto loop_autopm; 46571da177e4SLinus Torvalds } 46581da177e4SLinus Torvalds 46591da177e4SLinus Torvalds hub->nerrors = 0; 46601da177e4SLinus Torvalds hub->error = 0; 46611da177e4SLinus Torvalds } 46621da177e4SLinus Torvalds 46631da177e4SLinus Torvalds /* deal with port status changes */ 46641da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 46651da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 46661da177e4SLinus Torvalds continue; 46671da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 466872937e1eSSarah Sharp wakeup_change = test_and_clear_bit(i, hub->wakeup_bits); 46691da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 46704ee823b8SSarah Sharp !connect_change && !wakeup_change) 46711da177e4SLinus Torvalds continue; 46721da177e4SLinus Torvalds 46731da177e4SLinus Torvalds ret = hub_port_status(hub, i, 46741da177e4SLinus Torvalds &portstatus, &portchange); 46751da177e4SLinus Torvalds if (ret < 0) 46761da177e4SLinus Torvalds continue; 46771da177e4SLinus Torvalds 46781da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 4679ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 46801da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 46811da177e4SLinus Torvalds connect_change = 1; 46821da177e4SLinus Torvalds } 46831da177e4SLinus Torvalds 46841da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 46851da177e4SLinus Torvalds if (!connect_change) 46861da177e4SLinus Torvalds dev_dbg (hub_dev, 46871da177e4SLinus Torvalds "port %d enable change, " 46881da177e4SLinus Torvalds "status %08x\n", 46891da177e4SLinus Torvalds i, portstatus); 4690ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 46911da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 46921da177e4SLinus Torvalds 46931da177e4SLinus Torvalds /* 46941da177e4SLinus Torvalds * EM interference sometimes causes badly 46951da177e4SLinus Torvalds * shielded USB devices to be shutdown by 46961da177e4SLinus Torvalds * the hub, this hack enables them again. 46971da177e4SLinus Torvalds * Works at least with mouse driver. 46981da177e4SLinus Torvalds */ 46991da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 47001da177e4SLinus Torvalds && !connect_change 4701ff823c79SLan Tianyu && hub->ports[i - 1]->child) { 47021da177e4SLinus Torvalds dev_err (hub_dev, 47031da177e4SLinus Torvalds "port %i " 47041da177e4SLinus Torvalds "disabled by hub (EMI?), " 47051da177e4SLinus Torvalds "re-enabling...\n", 47061da177e4SLinus Torvalds i); 47071da177e4SLinus Torvalds connect_change = 1; 47081da177e4SLinus Torvalds } 47091da177e4SLinus Torvalds } 47101da177e4SLinus Torvalds 471172937e1eSSarah Sharp if (hub_handle_remote_wakeup(hub, i, 471272937e1eSSarah Sharp portstatus, portchange)) 47131da177e4SLinus Torvalds connect_change = 1; 47141da177e4SLinus Torvalds 47151da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 4716752d57a8SPaul Bolle u16 status = 0; 4717752d57a8SPaul Bolle u16 unused; 4718752d57a8SPaul Bolle 4719752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change on port " 4720752d57a8SPaul Bolle "%d\n", i); 4721ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47221da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 4723752d57a8SPaul Bolle msleep(100); /* Cool down */ 47248520f380SAlan Stern hub_power_on(hub, true); 4725752d57a8SPaul Bolle hub_port_status(hub, i, &status, &unused); 4726752d57a8SPaul Bolle if (status & USB_PORT_STAT_OVERCURRENT) 4727752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 4728752d57a8SPaul Bolle "condition on port %d\n", i); 47291da177e4SLinus Torvalds } 47301da177e4SLinus Torvalds 47311da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 47321da177e4SLinus Torvalds dev_dbg (hub_dev, 47331da177e4SLinus Torvalds "reset change on port %d\n", 47341da177e4SLinus Torvalds i); 4735ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47361da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 47371da177e4SLinus Torvalds } 4738c7061574SSarah Sharp if ((portchange & USB_PORT_STAT_C_BH_RESET) && 4739c7061574SSarah Sharp hub_is_superspeed(hub->hdev)) { 4740c7061574SSarah Sharp dev_dbg(hub_dev, 4741c7061574SSarah Sharp "warm reset change on port %d\n", 4742c7061574SSarah Sharp i); 4743ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 4744c7061574SSarah Sharp USB_PORT_FEAT_C_BH_PORT_RESET); 4745c7061574SSarah Sharp } 4746dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_LINK_STATE) { 4747ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, i, 4748dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_LINK_STATE); 4749dbe79bbeSJohn Youn } 4750dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 4751dbe79bbeSJohn Youn dev_warn(hub_dev, 4752dbe79bbeSJohn Youn "config error on port %d\n", 4753dbe79bbeSJohn Youn i); 4754ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, i, 4755dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 4756dbe79bbeSJohn Youn } 47571da177e4SLinus Torvalds 47585e467f6eSAndiry Xu /* Warm reset a USB3 protocol port if it's in 47595e467f6eSAndiry Xu * SS.Inactive state. 47605e467f6eSAndiry Xu */ 47618bea2bd3SStanislaw Ledwon if (hub_port_warm_reset_required(hub, portstatus)) { 476265bdac5eSSarah Sharp int status; 4763d3b9d7a9SSarah Sharp struct usb_device *udev = 4764d3b9d7a9SSarah Sharp hub->ports[i - 1]->child; 476565bdac5eSSarah Sharp 47665e467f6eSAndiry Xu dev_dbg(hub_dev, "warm reset port %d\n", i); 4767d3b9d7a9SSarah Sharp if (!udev) { 4768d3b9d7a9SSarah Sharp status = hub_port_reset(hub, i, 4769d3b9d7a9SSarah Sharp NULL, HUB_BH_RESET_TIME, 4770d3b9d7a9SSarah Sharp true); 477165bdac5eSSarah Sharp if (status < 0) 477265bdac5eSSarah Sharp hub_port_disable(hub, i, 1); 4773d3b9d7a9SSarah Sharp } else { 4774d3b9d7a9SSarah Sharp usb_lock_device(udev); 4775d3b9d7a9SSarah Sharp status = usb_reset_device(udev); 4776d3b9d7a9SSarah Sharp usb_unlock_device(udev); 4777d3b9d7a9SSarah Sharp } 477865bdac5eSSarah Sharp connect_change = 0; 47795e467f6eSAndiry Xu } 47805e467f6eSAndiry Xu 47811da177e4SLinus Torvalds if (connect_change) 47821da177e4SLinus Torvalds hub_port_connect_change(hub, i, 47831da177e4SLinus Torvalds portstatus, portchange); 47841da177e4SLinus Torvalds } /* end for i */ 47851da177e4SLinus Torvalds 47861da177e4SLinus Torvalds /* deal with hub status changes */ 47871da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 47881da177e4SLinus Torvalds ; /* do nothing */ 47891da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 47901da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 47911da177e4SLinus Torvalds else { 47921da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 47931da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 47941da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 479555c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 479655c52718SAlan Stern /* FIXME: Is this always true? */ 479755c52718SAlan Stern hub->limited_power = 1; 4798403fae78Sjidong xiao else 4799403fae78Sjidong xiao hub->limited_power = 0; 48001da177e4SLinus Torvalds } 48011da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 4802752d57a8SPaul Bolle u16 status = 0; 4803752d57a8SPaul Bolle u16 unused; 4804752d57a8SPaul Bolle 4805752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 48061da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 4807752d57a8SPaul Bolle msleep(500); /* Cool down */ 48088520f380SAlan Stern hub_power_on(hub, true); 4809752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 4810752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 4811752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 4812752d57a8SPaul Bolle "condition\n"); 48131da177e4SLinus Torvalds } 48141da177e4SLinus Torvalds } 48151da177e4SLinus Torvalds 481640f122f3SAlan Stern loop_autopm: 48178e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 48188e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 48191da177e4SLinus Torvalds loop: 48208e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface_no_resume() in 48218e4ceb38SAlan Stern * kick_khubd() and allow autosuspend. 48228e4ceb38SAlan Stern */ 48238e4ceb38SAlan Stern usb_autopm_put_interface(intf); 48249bbdf1e0SAlan Stern loop_disconnected: 48251da177e4SLinus Torvalds usb_unlock_device(hdev); 4826e8054854SAlan Stern kref_put(&hub->kref, hub_release); 48271da177e4SLinus Torvalds 48281da177e4SLinus Torvalds } /* end while (1) */ 48291da177e4SLinus Torvalds } 48301da177e4SLinus Torvalds 48311da177e4SLinus Torvalds static int hub_thread(void *__unused) 48321da177e4SLinus Torvalds { 48333bb1af52SAlan Stern /* khubd needs to be freezable to avoid intefering with USB-PERSIST 48343bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 48353bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 48363bb1af52SAlan Stern * the companion full-speed controller. 48373bb1af52SAlan Stern */ 483883144186SRafael J. Wysocki set_freezable(); 48393bb1af52SAlan Stern 48401da177e4SLinus Torvalds do { 48411da177e4SLinus Torvalds hub_events(); 4842e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 48439c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 48449c8d6178Sakpm@osdl.org kthread_should_stop()); 48459c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 48461da177e4SLinus Torvalds 48471da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 48489c8d6178Sakpm@osdl.org return 0; 48491da177e4SLinus Torvalds } 48501da177e4SLinus Torvalds 48511e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 4852e6f30deaSMing Lei { .match_flags = USB_DEVICE_ID_MATCH_VENDOR 4853e6f30deaSMing Lei | USB_DEVICE_ID_MATCH_INT_CLASS, 4854e6f30deaSMing Lei .idVendor = USB_VENDOR_GENESYS_LOGIC, 4855e6f30deaSMing Lei .bInterfaceClass = USB_CLASS_HUB, 4856e6f30deaSMing Lei .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, 48571da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 48581da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 48591da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 48601da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 48611da177e4SLinus Torvalds { } /* Terminating entry */ 48621da177e4SLinus Torvalds }; 48631da177e4SLinus Torvalds 48641da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 48651da177e4SLinus Torvalds 48661da177e4SLinus Torvalds static struct usb_driver hub_driver = { 48671da177e4SLinus Torvalds .name = "hub", 48681da177e4SLinus Torvalds .probe = hub_probe, 48691da177e4SLinus Torvalds .disconnect = hub_disconnect, 48701da177e4SLinus Torvalds .suspend = hub_suspend, 48711da177e4SLinus Torvalds .resume = hub_resume, 4872f07600cfSAlan Stern .reset_resume = hub_reset_resume, 48737de18d8bSAlan Stern .pre_reset = hub_pre_reset, 48747de18d8bSAlan Stern .post_reset = hub_post_reset, 4875c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 48761da177e4SLinus Torvalds .id_table = hub_id_table, 487740f122f3SAlan Stern .supports_autosuspend = 1, 48781da177e4SLinus Torvalds }; 48791da177e4SLinus Torvalds 48801da177e4SLinus Torvalds int usb_hub_init(void) 48811da177e4SLinus Torvalds { 48821da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 48831da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 48841da177e4SLinus Torvalds usbcore_name); 48851da177e4SLinus Torvalds return -1; 48861da177e4SLinus Torvalds } 48871da177e4SLinus Torvalds 48889c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 48899c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 48901da177e4SLinus Torvalds return 0; 48911da177e4SLinus Torvalds 48921da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 48931da177e4SLinus Torvalds usb_deregister(&hub_driver); 48941da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 48951da177e4SLinus Torvalds 48961da177e4SLinus Torvalds return -1; 48971da177e4SLinus Torvalds } 48981da177e4SLinus Torvalds 48991da177e4SLinus Torvalds void usb_hub_cleanup(void) 49001da177e4SLinus Torvalds { 49019c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 49021da177e4SLinus Torvalds 49031da177e4SLinus Torvalds /* 49041da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 49051da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 49061da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 49071da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 49081da177e4SLinus Torvalds * individual hub resources. -greg 49091da177e4SLinus Torvalds */ 49101da177e4SLinus Torvalds usb_deregister(&hub_driver); 49111da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 49121da177e4SLinus Torvalds 4913eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 4914eb764c4bSAlan Stern struct usb_device_descriptor *old_device_descriptor) 49151da177e4SLinus Torvalds { 4916eb764c4bSAlan Stern int changed = 0; 49171da177e4SLinus Torvalds unsigned index; 4918eb764c4bSAlan Stern unsigned serial_len = 0; 4919eb764c4bSAlan Stern unsigned len; 4920eb764c4bSAlan Stern unsigned old_length; 4921eb764c4bSAlan Stern int length; 4922eb764c4bSAlan Stern char *buf; 49231da177e4SLinus Torvalds 4924eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 4925eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 4926eb764c4bSAlan Stern return 1; 4927eb764c4bSAlan Stern 4928eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 4929eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 4930eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 4931eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 4932eb764c4bSAlan Stern * different flash card of the same brand). 4933eb764c4bSAlan Stern */ 4934eb764c4bSAlan Stern if (udev->serial) 4935eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 4936eb764c4bSAlan Stern 4937eb764c4bSAlan Stern len = serial_len; 49381da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 4939eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 4940eb764c4bSAlan Stern len = max(len, old_length); 49411da177e4SLinus Torvalds } 4942eb764c4bSAlan Stern 49430cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 49441da177e4SLinus Torvalds if (buf == NULL) { 49451da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 49461da177e4SLinus Torvalds /* assume the worst */ 49471da177e4SLinus Torvalds return 1; 49481da177e4SLinus Torvalds } 49491da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 4950eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 49511da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 49521da177e4SLinus Torvalds old_length); 4953eb764c4bSAlan Stern if (length != old_length) { 49541da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 49551da177e4SLinus Torvalds index, length); 4956eb764c4bSAlan Stern changed = 1; 49571da177e4SLinus Torvalds break; 49581da177e4SLinus Torvalds } 49591da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 49601da177e4SLinus Torvalds != 0) { 49611da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 4962eb764c4bSAlan Stern index, 4963eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 4964eb764c4bSAlan Stern bConfigurationValue); 4965eb764c4bSAlan Stern changed = 1; 49661da177e4SLinus Torvalds break; 49671da177e4SLinus Torvalds } 49681da177e4SLinus Torvalds } 4969eb764c4bSAlan Stern 4970eb764c4bSAlan Stern if (!changed && serial_len) { 4971eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 4972eb764c4bSAlan Stern buf, serial_len); 4973eb764c4bSAlan Stern if (length + 1 != serial_len) { 4974eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 4975eb764c4bSAlan Stern length); 4976eb764c4bSAlan Stern changed = 1; 4977eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 4978eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 4979eb764c4bSAlan Stern changed = 1; 4980eb764c4bSAlan Stern } 4981eb764c4bSAlan Stern } 4982eb764c4bSAlan Stern 49831da177e4SLinus Torvalds kfree(buf); 4984eb764c4bSAlan Stern return changed; 49851da177e4SLinus Torvalds } 49861da177e4SLinus Torvalds 49871da177e4SLinus Torvalds /** 4988742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 49891da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 49901da177e4SLinus Torvalds * 499179efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 499279efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 4993742120c6SMing Lei * Use usb_reset_device() instead. 49941da177e4SLinus Torvalds * 49951da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 49961da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 49971da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 49981da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 49991da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 50001da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 50011da177e4SLinus Torvalds * re-enumerated and probed all over again. 50021da177e4SLinus Torvalds * 50031da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 50041da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 50051da177e4SLinus Torvalds * if the reset wasn't even attempted. 50061da177e4SLinus Torvalds * 50071da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 50081da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 50091da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 50101da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 50116bc6cff5SAlan Stern * 50126bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 50136bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 50146bc6cff5SAlan Stern * holding the device lock because these tasks should always call 50156bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 50161da177e4SLinus Torvalds */ 5017742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 50181da177e4SLinus Torvalds { 50191da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 50201da177e4SLinus Torvalds struct usb_hub *parent_hub; 50213f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 50221da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 502312c3da34SAlan Stern int i, ret = 0; 502412c3da34SAlan Stern int port1 = udev->portnum; 50251da177e4SLinus Torvalds 50261da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 50271da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 50281da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 50291da177e4SLinus Torvalds udev->state); 50301da177e4SLinus Torvalds return -EINVAL; 50311da177e4SLinus Torvalds } 50321da177e4SLinus Torvalds 50331da177e4SLinus Torvalds if (!parent_hdev) { 50344bec9917SWolfram Sang /* this requires hcd-specific logic; see ohci_restart() */ 5035441b62c1SHarvey Harrison dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 50361da177e4SLinus Torvalds return -EISDIR; 50371da177e4SLinus Torvalds } 5038ad493e5eSLan Tianyu parent_hub = usb_hub_to_struct_hub(parent_hdev); 50391da177e4SLinus Torvalds 5040f74631e3SSarah Sharp /* Disable LPM and LTM while we reset the device and reinstall the alt 5041f74631e3SSarah Sharp * settings. Device-initiated LPM settings, and system exit latency 5042f74631e3SSarah Sharp * settings are cleared when the device is reset, so we have to set 5043f74631e3SSarah Sharp * them up again. 50446d1d0513SSarah Sharp */ 50456d1d0513SSarah Sharp ret = usb_unlocked_disable_lpm(udev); 50466d1d0513SSarah Sharp if (ret) { 50476d1d0513SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); 50486d1d0513SSarah Sharp goto re_enumerate; 50496d1d0513SSarah Sharp } 5050f74631e3SSarah Sharp ret = usb_disable_ltm(udev); 5051f74631e3SSarah Sharp if (ret) { 5052f74631e3SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LTM\n.", 5053f74631e3SSarah Sharp __func__); 5054f74631e3SSarah Sharp goto re_enumerate; 5055f74631e3SSarah Sharp } 50566d1d0513SSarah Sharp 50571da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 50581da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 50591da177e4SLinus Torvalds 50601da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 50611da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 5062fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 50631da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 5064dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 50651da177e4SLinus Torvalds break; 50661da177e4SLinus Torvalds } 50671da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 5068d5cbad4bSAlan Stern 50691da177e4SLinus Torvalds if (ret < 0) 50701da177e4SLinus Torvalds goto re_enumerate; 50711da177e4SLinus Torvalds 50721da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 5073eb764c4bSAlan Stern if (descriptors_changed(udev, &descriptor)) { 50741da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 50751da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 50761da177e4SLinus Torvalds goto re_enumerate; 50771da177e4SLinus Torvalds } 50781da177e4SLinus Torvalds 50794fe0387aSAlan Stern /* Restore the device's previous configuration */ 50801da177e4SLinus Torvalds if (!udev->actconfig) 50811da177e4SLinus Torvalds goto done; 50823f0479e0SSarah Sharp 5083d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 50843f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 50853f0479e0SSarah Sharp if (ret < 0) { 50863f0479e0SSarah Sharp dev_warn(&udev->dev, 50873f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 50883f0479e0SSarah Sharp "old configuration.\n"); 5089d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 50903f0479e0SSarah Sharp goto re_enumerate; 50913f0479e0SSarah Sharp } 50921da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 50931da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 50941da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 50951da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 50961da177e4SLinus Torvalds if (ret < 0) { 50971da177e4SLinus Torvalds dev_err(&udev->dev, 50981da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 50991da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 5100d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 51011da177e4SLinus Torvalds goto re_enumerate; 51021da177e4SLinus Torvalds } 5103d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 51041da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 51051da177e4SLinus Torvalds 51064fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 51074fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 51084fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 51094fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 51104fe0387aSAlan Stern * endpoint state. 51114fe0387aSAlan Stern */ 51121da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 51133f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 51143f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 51151da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 51161da177e4SLinus Torvalds 51171da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 51184fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 51194fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 51204fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 51214fe0387aSAlan Stern ret = 0; 51224fe0387aSAlan Stern } else { 512304a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 512404a723eaSSarah Sharp * device has been reset, and it will have to use 512504a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 51263f0479e0SSarah Sharp */ 512704a723eaSSarah Sharp intf->resetting_device = 1; 51281da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 51291da177e4SLinus Torvalds desc->bAlternateSetting); 513004a723eaSSarah Sharp intf->resetting_device = 0; 51314fe0387aSAlan Stern } 51321da177e4SLinus Torvalds if (ret < 0) { 51331da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 51341da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 51351da177e4SLinus Torvalds desc->bInterfaceNumber, 51361da177e4SLinus Torvalds desc->bAlternateSetting, 51371da177e4SLinus Torvalds ret); 51381da177e4SLinus Torvalds goto re_enumerate; 51391da177e4SLinus Torvalds } 51401da177e4SLinus Torvalds } 51411da177e4SLinus Torvalds 51421da177e4SLinus Torvalds done: 5143f74631e3SSarah Sharp /* Now that the alt settings are re-installed, enable LTM and LPM. */ 514478d9a487SAlan Stern usb_unlocked_enable_lpm(udev); 5145f74631e3SSarah Sharp usb_enable_ltm(udev); 51461da177e4SLinus Torvalds return 0; 51471da177e4SLinus Torvalds 51481da177e4SLinus Torvalds re_enumerate: 51496d1d0513SSarah Sharp /* LPM state doesn't matter when we're about to destroy the device. */ 51501da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 51511da177e4SLinus Torvalds return -ENODEV; 51521da177e4SLinus Torvalds } 51531da177e4SLinus Torvalds 51541da177e4SLinus Torvalds /** 51551da177e4SLinus Torvalds * usb_reset_device - warn interface drivers and perform a USB port reset 51561da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 51571da177e4SLinus Torvalds * 515879efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 515979efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 5160742120c6SMing Lei * the reset is over (using their post_reset method). 516179efa097SAlan Stern * 516279efa097SAlan Stern * Return value is the same as for usb_reset_and_verify_device(). 516379efa097SAlan Stern * 516479efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 516579efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 516679efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 5167742120c6SMing Lei * the device using usb_lock_device_for_reset(). 516879efa097SAlan Stern * 516979efa097SAlan Stern * If an interface is currently being probed or disconnected, we assume 517079efa097SAlan Stern * its driver knows how to handle resets. For all other interfaces, 517179efa097SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 517279efa097SAlan Stern * we attempt to unbind it and rebind afterward. 517379efa097SAlan Stern */ 5174742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 517579efa097SAlan Stern { 517679efa097SAlan Stern int ret; 5177852c4b43SAlan Stern int i; 51784d769defSMing Lei unsigned int noio_flag; 517979efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 518079efa097SAlan Stern 518179efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 518279efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 518379efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 518479efa097SAlan Stern udev->state); 518579efa097SAlan Stern return -EINVAL; 518679efa097SAlan Stern } 518779efa097SAlan Stern 51884d769defSMing Lei /* 51894d769defSMing Lei * Don't allocate memory with GFP_KERNEL in current 51904d769defSMing Lei * context to avoid possible deadlock if usb mass 51914d769defSMing Lei * storage interface or usbnet interface(iSCSI case) 51924d769defSMing Lei * is included in current configuration. The easist 51934d769defSMing Lei * approach is to do it for every device reset, 51944d769defSMing Lei * because the device 'memalloc_noio' flag may have 51954d769defSMing Lei * not been set before reseting the usb device. 51964d769defSMing Lei */ 51974d769defSMing Lei noio_flag = memalloc_noio_save(); 51984d769defSMing Lei 5199645daaabSAlan Stern /* Prevent autosuspend during the reset */ 520094fcda1fSAlan Stern usb_autoresume_device(udev); 5201645daaabSAlan Stern 520279efa097SAlan Stern if (config) { 5203852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 5204852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 520579efa097SAlan Stern struct usb_driver *drv; 520678d9a487SAlan Stern int unbind = 0; 520779efa097SAlan Stern 5208852c4b43SAlan Stern if (cintf->dev.driver) { 520979efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 521078d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 521178d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 521278d9a487SAlan Stern else if (cintf->condition == 521378d9a487SAlan Stern USB_INTERFACE_BOUND) 521478d9a487SAlan Stern unbind = 1; 521578d9a487SAlan Stern if (unbind) 521678d9a487SAlan Stern usb_forced_unbind_intf(cintf); 521779efa097SAlan Stern } 521879efa097SAlan Stern } 521979efa097SAlan Stern } 522079efa097SAlan Stern 5221742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 522279efa097SAlan Stern 522379efa097SAlan Stern if (config) { 5224852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 5225852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 522679efa097SAlan Stern struct usb_driver *drv; 522778d9a487SAlan Stern int rebind = cintf->needs_binding; 522879efa097SAlan Stern 522978d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 523079efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 523179efa097SAlan Stern if (drv->post_reset) 523278d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 523378d9a487SAlan Stern else if (cintf->condition == 523478d9a487SAlan Stern USB_INTERFACE_BOUND) 523578d9a487SAlan Stern rebind = 1; 523679efa097SAlan Stern } 52376c640945SAlan Stern if (ret == 0 && rebind) 523878d9a487SAlan Stern usb_rebind_intf(cintf); 523979efa097SAlan Stern } 524079efa097SAlan Stern } 524179efa097SAlan Stern 524294fcda1fSAlan Stern usb_autosuspend_device(udev); 52434d769defSMing Lei memalloc_noio_restore(noio_flag); 524479efa097SAlan Stern return ret; 524579efa097SAlan Stern } 5246742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 5247dc023dceSInaky Perez-Gonzalez 5248dc023dceSInaky Perez-Gonzalez 5249dc023dceSInaky Perez-Gonzalez /** 5250dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 5251dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 5252dc023dceSInaky Perez-Gonzalez * 5253dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 5254dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 5255dc023dceSInaky Perez-Gonzalez * 5256dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 5257dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 5258dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 5259dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 5260dc023dceSInaky Perez-Gonzalez * 5261dc023dceSInaky Perez-Gonzalez * Corner cases: 5262dc023dceSInaky Perez-Gonzalez * 5263dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 5264dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 5265dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 5266dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 5267dc023dceSInaky Perez-Gonzalez * 5268dc023dceSInaky Perez-Gonzalez * - If a driver is unbound and it had a pending reset, the reset will 5269dc023dceSInaky Perez-Gonzalez * be cancelled. 5270dc023dceSInaky Perez-Gonzalez * 5271dc023dceSInaky Perez-Gonzalez * - This function can be called during .probe() or .disconnect() 5272dc023dceSInaky Perez-Gonzalez * times. On return from .disconnect(), any pending resets will be 5273dc023dceSInaky Perez-Gonzalez * cancelled. 5274dc023dceSInaky Perez-Gonzalez * 5275dc023dceSInaky Perez-Gonzalez * There is no no need to lock/unlock the @reset_ws as schedule_work() 5276dc023dceSInaky Perez-Gonzalez * does its own. 5277dc023dceSInaky Perez-Gonzalez * 5278dc023dceSInaky Perez-Gonzalez * NOTE: We don't do any reference count tracking because it is not 5279dc023dceSInaky Perez-Gonzalez * needed. The lifecycle of the work_struct is tied to the 5280dc023dceSInaky Perez-Gonzalez * usb_interface. Before destroying the interface we cancel the 5281dc023dceSInaky Perez-Gonzalez * work_struct, so the fact that work_struct is queued and or 5282dc023dceSInaky Perez-Gonzalez * running means the interface (and thus, the device) exist and 5283dc023dceSInaky Perez-Gonzalez * are referenced. 5284dc023dceSInaky Perez-Gonzalez */ 5285dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 5286dc023dceSInaky Perez-Gonzalez { 5287dc023dceSInaky Perez-Gonzalez schedule_work(&iface->reset_ws); 5288dc023dceSInaky Perez-Gonzalez } 5289dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 5290ff823c79SLan Tianyu 5291ff823c79SLan Tianyu /** 5292ff823c79SLan Tianyu * usb_hub_find_child - Get the pointer of child device 5293ff823c79SLan Tianyu * attached to the port which is specified by @port1. 5294ff823c79SLan Tianyu * @hdev: USB device belonging to the usb hub 5295ff823c79SLan Tianyu * @port1: port num to indicate which port the child device 5296ff823c79SLan Tianyu * is attached to. 5297ff823c79SLan Tianyu * 5298ff823c79SLan Tianyu * USB drivers call this function to get hub's child device 5299ff823c79SLan Tianyu * pointer. 5300ff823c79SLan Tianyu * 5301ff823c79SLan Tianyu * Return NULL if input param is invalid and 5302ff823c79SLan Tianyu * child's usb_device pointer if non-NULL. 5303ff823c79SLan Tianyu */ 5304ff823c79SLan Tianyu struct usb_device *usb_hub_find_child(struct usb_device *hdev, 5305ff823c79SLan Tianyu int port1) 5306ff823c79SLan Tianyu { 5307ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5308ff823c79SLan Tianyu 5309ff823c79SLan Tianyu if (port1 < 1 || port1 > hdev->maxchild) 5310ff823c79SLan Tianyu return NULL; 5311ff823c79SLan Tianyu return hub->ports[port1 - 1]->child; 5312ff823c79SLan Tianyu } 5313ff823c79SLan Tianyu EXPORT_SYMBOL_GPL(usb_hub_find_child); 5314d5575424SLan Tianyu 531505f91689SLan Tianyu /** 531605f91689SLan Tianyu * usb_set_hub_port_connect_type - set hub port connect type. 531705f91689SLan Tianyu * @hdev: USB device belonging to the usb hub 531805f91689SLan Tianyu * @port1: port num of the port 531905f91689SLan Tianyu * @type: connect type of the port 532005f91689SLan Tianyu */ 532105f91689SLan Tianyu void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1, 532205f91689SLan Tianyu enum usb_port_connect_type type) 532305f91689SLan Tianyu { 5324ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 532505f91689SLan Tianyu 532641341261SMathias Nyman if (hub) 532705f91689SLan Tianyu hub->ports[port1 - 1]->connect_type = type; 532805f91689SLan Tianyu } 532905f91689SLan Tianyu 533005f91689SLan Tianyu /** 533105f91689SLan Tianyu * usb_get_hub_port_connect_type - Get the port's connect type 533205f91689SLan Tianyu * @hdev: USB device belonging to the usb hub 533305f91689SLan Tianyu * @port1: port num of the port 533405f91689SLan Tianyu * 533505f91689SLan Tianyu * Return connect type of the port and if input params are 533605f91689SLan Tianyu * invalid, return USB_PORT_CONNECT_TYPE_UNKNOWN. 533705f91689SLan Tianyu */ 533805f91689SLan Tianyu enum usb_port_connect_type 533905f91689SLan Tianyu usb_get_hub_port_connect_type(struct usb_device *hdev, int port1) 534005f91689SLan Tianyu { 5341ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 534205f91689SLan Tianyu 534341341261SMathias Nyman if (!hub) 534441341261SMathias Nyman return USB_PORT_CONNECT_TYPE_UNKNOWN; 534541341261SMathias Nyman 534605f91689SLan Tianyu return hub->ports[port1 - 1]->connect_type; 534705f91689SLan Tianyu } 534805f91689SLan Tianyu 5349d2123fd9SLan Tianyu void usb_hub_adjust_deviceremovable(struct usb_device *hdev, 5350d2123fd9SLan Tianyu struct usb_hub_descriptor *desc) 5351d2123fd9SLan Tianyu { 5352d2123fd9SLan Tianyu enum usb_port_connect_type connect_type; 5353d2123fd9SLan Tianyu int i; 5354d2123fd9SLan Tianyu 5355d2123fd9SLan Tianyu if (!hub_is_superspeed(hdev)) { 5356d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5357d2123fd9SLan Tianyu connect_type = usb_get_hub_port_connect_type(hdev, i); 5358d2123fd9SLan Tianyu 5359d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5360d2123fd9SLan Tianyu u8 mask = 1 << (i%8); 5361d2123fd9SLan Tianyu 5362d2123fd9SLan Tianyu if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { 5363d2123fd9SLan Tianyu dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", 5364d2123fd9SLan Tianyu i); 5365d2123fd9SLan Tianyu desc->u.hs.DeviceRemovable[i/8] |= mask; 5366d2123fd9SLan Tianyu } 5367d2123fd9SLan Tianyu } 5368d2123fd9SLan Tianyu } 5369d2123fd9SLan Tianyu } else { 5370d2123fd9SLan Tianyu u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); 5371d2123fd9SLan Tianyu 5372d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5373d2123fd9SLan Tianyu connect_type = usb_get_hub_port_connect_type(hdev, i); 5374d2123fd9SLan Tianyu 5375d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5376d2123fd9SLan Tianyu u16 mask = 1 << i; 5377d2123fd9SLan Tianyu 5378d2123fd9SLan Tianyu if (!(port_removable & mask)) { 5379d2123fd9SLan Tianyu dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", 5380d2123fd9SLan Tianyu i); 5381d2123fd9SLan Tianyu port_removable |= mask; 5382d2123fd9SLan Tianyu } 5383d2123fd9SLan Tianyu } 5384d2123fd9SLan Tianyu } 5385d2123fd9SLan Tianyu 5386d2123fd9SLan Tianyu desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); 5387d2123fd9SLan Tianyu } 5388d2123fd9SLan Tianyu } 5389d2123fd9SLan Tianyu 5390d5575424SLan Tianyu #ifdef CONFIG_ACPI 5391d5575424SLan Tianyu /** 5392d5575424SLan Tianyu * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle 5393d5575424SLan Tianyu * @hdev: USB device belonging to the usb hub 5394d5575424SLan Tianyu * @port1: port num of the port 5395d5575424SLan Tianyu * 5396d5575424SLan Tianyu * Return port's acpi handle if successful, NULL if params are 5397d5575424SLan Tianyu * invaild. 5398d5575424SLan Tianyu */ 5399d5575424SLan Tianyu acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, 5400d5575424SLan Tianyu int port1) 5401d5575424SLan Tianyu { 5402ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5403d5575424SLan Tianyu 540441341261SMathias Nyman if (!hub) 540541341261SMathias Nyman return NULL; 540641341261SMathias Nyman 5407d5575424SLan Tianyu return DEVICE_ACPI_HANDLE(&hub->ports[port1 - 1]->dev); 5408d5575424SLan Tianyu } 5409d5575424SLan Tianyu #endif 5410