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> 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds #include <asm/uaccess.h> 311da177e4SLinus Torvalds #include <asm/byteorder.h> 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds #include "usb.h" 341da177e4SLinus Torvalds 35f2a383e4SGreg Kroah-Hartman /* if we are in debug mode, always announce new devices */ 36f2a383e4SGreg Kroah-Hartman #ifdef DEBUG 37f2a383e4SGreg Kroah-Hartman #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES 38f2a383e4SGreg Kroah-Hartman #define CONFIG_USB_ANNOUNCE_NEW_DEVICES 39f2a383e4SGreg Kroah-Hartman #endif 40f2a383e4SGreg Kroah-Hartman #endif 41f2a383e4SGreg Kroah-Hartman 42e6f30deaSMing Lei #define USB_VENDOR_GENESYS_LOGIC 0x05e3 43e6f30deaSMing Lei #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 44e6f30deaSMing Lei 45fa2a9566SLan Tianyu struct usb_port { 46ff823c79SLan Tianyu struct usb_device *child; 47fa2a9566SLan Tianyu struct device dev; 48fa2a9566SLan Tianyu struct dev_state *port_owner; 4905f91689SLan Tianyu enum usb_port_connect_type connect_type; 50fa2a9566SLan Tianyu }; 51fa2a9566SLan Tianyu 521bb5f66bSAlan Stern struct usb_hub { 531bb5f66bSAlan Stern struct device *intfdev; /* the "interface" device */ 541bb5f66bSAlan Stern struct usb_device *hdev; 55e8054854SAlan Stern struct kref kref; 561bb5f66bSAlan Stern struct urb *urb; /* for interrupt polling pipe */ 571bb5f66bSAlan Stern 581bb5f66bSAlan Stern /* buffer for urb ... with extra space in case of babble */ 591bb5f66bSAlan Stern char (*buffer)[8]; 601bb5f66bSAlan Stern union { 611bb5f66bSAlan Stern struct usb_hub_status hub; 621bb5f66bSAlan Stern struct usb_port_status port; 631bb5f66bSAlan Stern } *status; /* buffer for status reports */ 64db90e7a1SAlan Stern struct mutex status_mutex; /* for the status buffer */ 651bb5f66bSAlan Stern 661bb5f66bSAlan Stern int error; /* last reported error */ 671bb5f66bSAlan Stern int nerrors; /* track consecutive errors */ 681bb5f66bSAlan Stern 691bb5f66bSAlan Stern struct list_head event_list; /* hubs w/data or errs ready */ 701bb5f66bSAlan Stern unsigned long event_bits[1]; /* status change bitmask */ 711bb5f66bSAlan Stern unsigned long change_bits[1]; /* ports with logical connect 721bb5f66bSAlan Stern status change */ 731bb5f66bSAlan Stern unsigned long busy_bits[1]; /* ports being reset or 741bb5f66bSAlan Stern resumed */ 75253e0572SAlan Stern unsigned long removed_bits[1]; /* ports with a "removed" 76253e0572SAlan Stern device present */ 774ee823b8SSarah Sharp unsigned long wakeup_bits[1]; /* ports that have signaled 784ee823b8SSarah Sharp remote wakeup */ 791bb5f66bSAlan Stern #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ 801bb5f66bSAlan Stern #error event_bits[] is too short! 811bb5f66bSAlan Stern #endif 821bb5f66bSAlan Stern 831bb5f66bSAlan Stern struct usb_hub_descriptor *descriptor; /* class descriptor */ 841bb5f66bSAlan Stern struct usb_tt tt; /* Transaction Translator */ 851bb5f66bSAlan Stern 861bb5f66bSAlan Stern unsigned mA_per_port; /* current for each child */ 871bb5f66bSAlan Stern 881bb5f66bSAlan Stern unsigned limited_power:1; 891bb5f66bSAlan Stern unsigned quiescing:1; 90e8054854SAlan Stern unsigned disconnected:1; 911bb5f66bSAlan Stern 92e6f30deaSMing Lei unsigned quirk_check_port_auto_suspend:1; 93e6f30deaSMing Lei 941bb5f66bSAlan Stern unsigned has_indicators:1; 951bb5f66bSAlan Stern u8 indicator[USB_MAXCHILDREN]; 966d5aefb8SDavid Howells struct delayed_work leds; 978520f380SAlan Stern struct delayed_work init_work; 98fa2a9566SLan Tianyu struct usb_port **ports; 991bb5f66bSAlan Stern }; 1001bb5f66bSAlan Stern 101dbe79bbeSJohn Youn static inline int hub_is_superspeed(struct usb_device *hdev) 102dbe79bbeSJohn Youn { 1037bf01185SAman Deep return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS); 104dbe79bbeSJohn Youn } 1051bb5f66bSAlan Stern 106fa286188SGreg Kroah-Hartman /* Protect struct usb_device->state and ->children members 1079ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 1081da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 1091da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds /* khubd's worklist and its lock */ 1121da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 1131da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds /* Wakes up khubd */ 1161da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 1171da177e4SLinus Torvalds 1189c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 12190ab5ee9SRusty Russell static bool blinkenlights = 0; 1221da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 1231da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds /* 126fd7c519dSJaroslav Kysela * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about 127fd7c519dSJaroslav Kysela * 10 seconds to send reply for the initial 64-byte descriptor request. 128fd7c519dSJaroslav Kysela */ 129fd7c519dSJaroslav Kysela /* define initial 64-byte descriptor request timeout in milliseconds */ 130fd7c519dSJaroslav Kysela static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; 131fd7c519dSJaroslav Kysela module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); 132b9cef6c3SWu Fengguang MODULE_PARM_DESC(initial_descriptor_timeout, 133b9cef6c3SWu Fengguang "initial 64-byte descriptor request timeout in milliseconds " 134b9cef6c3SWu Fengguang "(default 5000 - 5.0 seconds)"); 135fd7c519dSJaroslav Kysela 136fd7c519dSJaroslav Kysela /* 1371da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 1381da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 1391da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 1401da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 1411da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 1421da177e4SLinus Torvalds * following module parameters. 1431da177e4SLinus Torvalds * 1441da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 1451da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 1461da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 1471da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 1481da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 1491da177e4SLinus Torvalds */ 15090ab5ee9SRusty Russell static bool old_scheme_first = 0; 1511da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 1521da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 1531da177e4SLinus Torvalds "start with the old device initialization scheme"); 1541da177e4SLinus Torvalds 15590ab5ee9SRusty Russell static bool use_both_schemes = 1; 1561da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 1571da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1581da177e4SLinus Torvalds "try the other device initialization scheme if the " 1591da177e4SLinus Torvalds "first one fails"); 1601da177e4SLinus Torvalds 16132fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 16232fe0198SAlan Stern * port reset on some companion controllers. 16332fe0198SAlan Stern */ 16432fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 16532fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 16632fe0198SAlan Stern 167948fea37SAlan Stern #define HUB_DEBOUNCE_TIMEOUT 1500 168948fea37SAlan Stern #define HUB_DEBOUNCE_STEP 25 169948fea37SAlan Stern #define HUB_DEBOUNCE_STABLE 100 170948fea37SAlan Stern 171fa2a9566SLan Tianyu #define to_usb_port(_dev) \ 172fa2a9566SLan Tianyu container_of(_dev, struct usb_port, dev) 1731da177e4SLinus Torvalds 174742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev); 175742120c6SMing Lei 176131dec34SSarah Sharp static inline char *portspeed(struct usb_hub *hub, int portstatus) 1771da177e4SLinus Torvalds { 178131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 179131dec34SSarah Sharp return "5.0 Gb/s"; 180288ead45SAlan Stern if (portstatus & USB_PORT_STAT_HIGH_SPEED) 1811da177e4SLinus Torvalds return "480 Mb/s"; 182288ead45SAlan Stern else if (portstatus & USB_PORT_STAT_LOW_SPEED) 1831da177e4SLinus Torvalds return "1.5 Mb/s"; 1841da177e4SLinus Torvalds else 1851da177e4SLinus Torvalds return "12 Mb/s"; 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 18925118084SAlan Stern static struct usb_hub *hdev_to_hub(struct usb_device *hdev) 1901da177e4SLinus Torvalds { 191ff823c79SLan Tianyu if (!hdev || !hdev->actconfig || !hdev->maxchild) 19225118084SAlan Stern return NULL; 1931da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds 196d9b2099cSSarah Sharp static int usb_device_supports_lpm(struct usb_device *udev) 197d9b2099cSSarah Sharp { 198d9b2099cSSarah Sharp /* USB 2.1 (and greater) devices indicate LPM support through 199d9b2099cSSarah Sharp * their USB 2.0 Extended Capabilities BOS descriptor. 200d9b2099cSSarah Sharp */ 201d9b2099cSSarah Sharp if (udev->speed == USB_SPEED_HIGH) { 202d9b2099cSSarah Sharp if (udev->bos->ext_cap && 203d9b2099cSSarah Sharp (USB_LPM_SUPPORT & 204d9b2099cSSarah Sharp le32_to_cpu(udev->bos->ext_cap->bmAttributes))) 205d9b2099cSSarah Sharp return 1; 206d9b2099cSSarah Sharp return 0; 207d9b2099cSSarah Sharp } 20851e0a012SSarah Sharp 20951e0a012SSarah Sharp /* All USB 3.0 must support LPM, but we need their max exit latency 21051e0a012SSarah Sharp * information from the SuperSpeed Extended Capabilities BOS descriptor. 21151e0a012SSarah Sharp */ 21251e0a012SSarah Sharp if (!udev->bos->ss_cap) { 21351e0a012SSarah Sharp dev_warn(&udev->dev, "No LPM exit latency info found. " 21451e0a012SSarah Sharp "Power management will be impacted.\n"); 215d9b2099cSSarah Sharp return 0; 216d9b2099cSSarah Sharp } 21751e0a012SSarah Sharp if (udev->parent->lpm_capable) 21851e0a012SSarah Sharp return 1; 21951e0a012SSarah Sharp 22051e0a012SSarah Sharp dev_warn(&udev->dev, "Parent hub missing LPM exit latency info. " 22151e0a012SSarah Sharp "Power management will be impacted.\n"); 22251e0a012SSarah Sharp return 0; 22351e0a012SSarah Sharp } 22451e0a012SSarah Sharp 22551e0a012SSarah Sharp /* 22651e0a012SSarah Sharp * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from 22751e0a012SSarah Sharp * either U1 or U2. 22851e0a012SSarah Sharp */ 22951e0a012SSarah Sharp static void usb_set_lpm_mel(struct usb_device *udev, 23051e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 23151e0a012SSarah Sharp unsigned int udev_exit_latency, 23251e0a012SSarah Sharp struct usb_hub *hub, 23351e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 23451e0a012SSarah Sharp unsigned int hub_exit_latency) 23551e0a012SSarah Sharp { 23651e0a012SSarah Sharp unsigned int total_mel; 23751e0a012SSarah Sharp unsigned int device_mel; 23851e0a012SSarah Sharp unsigned int hub_mel; 23951e0a012SSarah Sharp 24051e0a012SSarah Sharp /* 24151e0a012SSarah Sharp * Calculate the time it takes to transition all links from the roothub 24251e0a012SSarah Sharp * to the parent hub into U0. The parent hub must then decode the 24351e0a012SSarah Sharp * packet (hub header decode latency) to figure out which port it was 24451e0a012SSarah Sharp * bound for. 24551e0a012SSarah Sharp * 24651e0a012SSarah Sharp * The Hub Header decode latency is expressed in 0.1us intervals (0x1 24751e0a012SSarah Sharp * means 0.1us). Multiply that by 100 to get nanoseconds. 24851e0a012SSarah Sharp */ 24951e0a012SSarah Sharp total_mel = hub_lpm_params->mel + 25051e0a012SSarah Sharp (hub->descriptor->u.ss.bHubHdrDecLat * 100); 25151e0a012SSarah Sharp 25251e0a012SSarah Sharp /* 25351e0a012SSarah Sharp * How long will it take to transition the downstream hub's port into 25451e0a012SSarah Sharp * U0? The greater of either the hub exit latency or the device exit 25551e0a012SSarah Sharp * latency. 25651e0a012SSarah Sharp * 25751e0a012SSarah Sharp * The BOS U1/U2 exit latencies are expressed in 1us intervals. 25851e0a012SSarah Sharp * Multiply that by 1000 to get nanoseconds. 25951e0a012SSarah Sharp */ 26051e0a012SSarah Sharp device_mel = udev_exit_latency * 1000; 26151e0a012SSarah Sharp hub_mel = hub_exit_latency * 1000; 26251e0a012SSarah Sharp if (device_mel > hub_mel) 26351e0a012SSarah Sharp total_mel += device_mel; 26451e0a012SSarah Sharp else 26551e0a012SSarah Sharp total_mel += hub_mel; 26651e0a012SSarah Sharp 26751e0a012SSarah Sharp udev_lpm_params->mel = total_mel; 26851e0a012SSarah Sharp } 26951e0a012SSarah Sharp 27051e0a012SSarah Sharp /* 27151e0a012SSarah Sharp * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate 27251e0a012SSarah Sharp * a transition from either U1 or U2. 27351e0a012SSarah Sharp */ 27451e0a012SSarah Sharp static void usb_set_lpm_pel(struct usb_device *udev, 27551e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 27651e0a012SSarah Sharp unsigned int udev_exit_latency, 27751e0a012SSarah Sharp struct usb_hub *hub, 27851e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 27951e0a012SSarah Sharp unsigned int hub_exit_latency, 28051e0a012SSarah Sharp unsigned int port_to_port_exit_latency) 28151e0a012SSarah Sharp { 28251e0a012SSarah Sharp unsigned int first_link_pel; 28351e0a012SSarah Sharp unsigned int hub_pel; 28451e0a012SSarah Sharp 28551e0a012SSarah Sharp /* 28651e0a012SSarah Sharp * First, the device sends an LFPS to transition the link between the 28751e0a012SSarah Sharp * device and the parent hub into U0. The exit latency is the bigger of 28851e0a012SSarah Sharp * the device exit latency or the hub exit latency. 28951e0a012SSarah Sharp */ 29051e0a012SSarah Sharp if (udev_exit_latency > hub_exit_latency) 29151e0a012SSarah Sharp first_link_pel = udev_exit_latency * 1000; 29251e0a012SSarah Sharp else 29351e0a012SSarah Sharp first_link_pel = hub_exit_latency * 1000; 29451e0a012SSarah Sharp 29551e0a012SSarah Sharp /* 29651e0a012SSarah Sharp * When the hub starts to receive the LFPS, there is a slight delay for 29751e0a012SSarah Sharp * it to figure out that one of the ports is sending an LFPS. Then it 29851e0a012SSarah Sharp * will forward the LFPS to its upstream link. The exit latency is the 29951e0a012SSarah Sharp * delay, plus the PEL that we calculated for this hub. 30051e0a012SSarah Sharp */ 30151e0a012SSarah Sharp hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; 30251e0a012SSarah Sharp 30351e0a012SSarah Sharp /* 30451e0a012SSarah Sharp * According to figure C-7 in the USB 3.0 spec, the PEL for this device 30551e0a012SSarah Sharp * is the greater of the two exit latencies. 30651e0a012SSarah Sharp */ 30751e0a012SSarah Sharp if (first_link_pel > hub_pel) 30851e0a012SSarah Sharp udev_lpm_params->pel = first_link_pel; 30951e0a012SSarah Sharp else 31051e0a012SSarah Sharp udev_lpm_params->pel = hub_pel; 31151e0a012SSarah Sharp } 31251e0a012SSarah Sharp 31351e0a012SSarah Sharp /* 31451e0a012SSarah Sharp * Set the System Exit Latency (SEL) to indicate the total worst-case time from 31551e0a012SSarah Sharp * when a device initiates a transition to U0, until when it will receive the 31651e0a012SSarah Sharp * first packet from the host controller. 31751e0a012SSarah Sharp * 31851e0a012SSarah Sharp * Section C.1.5.1 describes the four components to this: 31951e0a012SSarah Sharp * - t1: device PEL 32051e0a012SSarah Sharp * - t2: time for the ERDY to make it from the device to the host. 32151e0a012SSarah Sharp * - t3: a host-specific delay to process the ERDY. 32251e0a012SSarah Sharp * - t4: time for the packet to make it from the host to the device. 32351e0a012SSarah Sharp * 32451e0a012SSarah Sharp * t3 is specific to both the xHCI host and the platform the host is integrated 32551e0a012SSarah Sharp * into. The Intel HW folks have said it's negligible, FIXME if a different 32651e0a012SSarah Sharp * vendor says otherwise. 32751e0a012SSarah Sharp */ 32851e0a012SSarah Sharp static void usb_set_lpm_sel(struct usb_device *udev, 32951e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params) 33051e0a012SSarah Sharp { 33151e0a012SSarah Sharp struct usb_device *parent; 33251e0a012SSarah Sharp unsigned int num_hubs; 33351e0a012SSarah Sharp unsigned int total_sel; 33451e0a012SSarah Sharp 33551e0a012SSarah Sharp /* t1 = device PEL */ 33651e0a012SSarah Sharp total_sel = udev_lpm_params->pel; 33751e0a012SSarah Sharp /* How many external hubs are in between the device & the root port. */ 33851e0a012SSarah Sharp for (parent = udev->parent, num_hubs = 0; parent->parent; 33951e0a012SSarah Sharp parent = parent->parent) 34051e0a012SSarah Sharp num_hubs++; 34151e0a012SSarah Sharp /* t2 = 2.1us + 250ns * (num_hubs - 1) */ 34251e0a012SSarah Sharp if (num_hubs > 0) 34351e0a012SSarah Sharp total_sel += 2100 + 250 * (num_hubs - 1); 34451e0a012SSarah Sharp 34551e0a012SSarah Sharp /* t4 = 250ns * num_hubs */ 34651e0a012SSarah Sharp total_sel += 250 * num_hubs; 34751e0a012SSarah Sharp 34851e0a012SSarah Sharp udev_lpm_params->sel = total_sel; 34951e0a012SSarah Sharp } 35051e0a012SSarah Sharp 35151e0a012SSarah Sharp static void usb_set_lpm_parameters(struct usb_device *udev) 35251e0a012SSarah Sharp { 35351e0a012SSarah Sharp struct usb_hub *hub; 35451e0a012SSarah Sharp unsigned int port_to_port_delay; 35551e0a012SSarah Sharp unsigned int udev_u1_del; 35651e0a012SSarah Sharp unsigned int udev_u2_del; 35751e0a012SSarah Sharp unsigned int hub_u1_del; 35851e0a012SSarah Sharp unsigned int hub_u2_del; 35951e0a012SSarah Sharp 36051e0a012SSarah Sharp if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER) 36151e0a012SSarah Sharp return; 36251e0a012SSarah Sharp 36351e0a012SSarah Sharp hub = hdev_to_hub(udev->parent); 36451e0a012SSarah Sharp /* It doesn't take time to transition the roothub into U0, since it 36551e0a012SSarah Sharp * doesn't have an upstream link. 36651e0a012SSarah Sharp */ 36751e0a012SSarah Sharp if (!hub) 36851e0a012SSarah Sharp return; 36951e0a012SSarah Sharp 37051e0a012SSarah Sharp udev_u1_del = udev->bos->ss_cap->bU1devExitLat; 37151e0a012SSarah Sharp udev_u2_del = udev->bos->ss_cap->bU2DevExitLat; 37251e0a012SSarah Sharp hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; 37351e0a012SSarah Sharp hub_u2_del = udev->parent->bos->ss_cap->bU2DevExitLat; 37451e0a012SSarah Sharp 37551e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, 37651e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del); 37751e0a012SSarah Sharp 37851e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, 37951e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del); 38051e0a012SSarah Sharp 38151e0a012SSarah Sharp /* 38251e0a012SSarah Sharp * Appendix C, section C.2.2.2, says that there is a slight delay from 38351e0a012SSarah Sharp * when the parent hub notices the downstream port is trying to 38451e0a012SSarah Sharp * transition to U0 to when the hub initiates a U0 transition on its 38551e0a012SSarah Sharp * upstream port. The section says the delays are tPort2PortU1EL and 38651e0a012SSarah Sharp * tPort2PortU2EL, but it doesn't define what they are. 38751e0a012SSarah Sharp * 38851e0a012SSarah Sharp * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking 38951e0a012SSarah Sharp * about the same delays. Use the maximum delay calculations from those 39051e0a012SSarah Sharp * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For 39151e0a012SSarah Sharp * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I 39251e0a012SSarah Sharp * assume the device exit latencies they are talking about are the hub 39351e0a012SSarah Sharp * exit latencies. 39451e0a012SSarah Sharp * 39551e0a012SSarah Sharp * What do we do if the U2 exit latency is less than the U1 exit 39651e0a012SSarah Sharp * latency? It's possible, although not likely... 39751e0a012SSarah Sharp */ 39851e0a012SSarah Sharp port_to_port_delay = 1; 39951e0a012SSarah Sharp 40051e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, 40151e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del, 40251e0a012SSarah Sharp port_to_port_delay); 40351e0a012SSarah Sharp 40451e0a012SSarah Sharp if (hub_u2_del > hub_u1_del) 40551e0a012SSarah Sharp port_to_port_delay = 1 + hub_u2_del - hub_u1_del; 40651e0a012SSarah Sharp else 40751e0a012SSarah Sharp port_to_port_delay = 1 + hub_u1_del; 40851e0a012SSarah Sharp 40951e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, 41051e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del, 41151e0a012SSarah Sharp port_to_port_delay); 41251e0a012SSarah Sharp 41351e0a012SSarah Sharp /* Now that we've got PEL, calculate SEL. */ 41451e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u1_params); 41551e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u2_params); 41651e0a012SSarah Sharp } 417d9b2099cSSarah Sharp 4181da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 419dbe79bbeSJohn Youn static int get_hub_descriptor(struct usb_device *hdev, void *data) 4201da177e4SLinus Torvalds { 421dbe79bbeSJohn Youn int i, ret, size; 422dbe79bbeSJohn Youn unsigned dtype; 423dbe79bbeSJohn Youn 424dbe79bbeSJohn Youn if (hub_is_superspeed(hdev)) { 425dbe79bbeSJohn Youn dtype = USB_DT_SS_HUB; 426dbe79bbeSJohn Youn size = USB_DT_SS_HUB_SIZE; 427dbe79bbeSJohn Youn } else { 428dbe79bbeSJohn Youn dtype = USB_DT_HUB; 429dbe79bbeSJohn Youn size = sizeof(struct usb_hub_descriptor); 430dbe79bbeSJohn Youn } 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 4331da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 4341da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 435dbe79bbeSJohn Youn dtype << 8, 0, data, size, 4361da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 4371da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 4381da177e4SLinus Torvalds return ret; 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds return -EINVAL; 4411da177e4SLinus Torvalds } 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds /* 4441da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 4451da177e4SLinus Torvalds */ 4461da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 4471da177e4SLinus Torvalds { 4481da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4491da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 4501da177e4SLinus Torvalds } 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds /* 4531da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 4541da177e4SLinus Torvalds */ 4551da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 4561da177e4SLinus Torvalds { 4571da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4581da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 4591da177e4SLinus Torvalds NULL, 0, 1000); 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds /* 4631da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 4641da177e4SLinus Torvalds */ 4651da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 4661da177e4SLinus Torvalds { 4671da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4681da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 4691da177e4SLinus Torvalds NULL, 0, 1000); 4701da177e4SLinus Torvalds } 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds /* 4731da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 4741da177e4SLinus Torvalds * for info about using port indicators 4751da177e4SLinus Torvalds */ 4761da177e4SLinus Torvalds static void set_port_led( 4771da177e4SLinus Torvalds struct usb_hub *hub, 4781da177e4SLinus Torvalds int port1, 4791da177e4SLinus Torvalds int selector 4801da177e4SLinus Torvalds ) 4811da177e4SLinus Torvalds { 4821da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 4831da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 4841da177e4SLinus Torvalds if (status < 0) 4851da177e4SLinus Torvalds dev_dbg (hub->intfdev, 4861da177e4SLinus Torvalds "port %d indicator %s status %d\n", 4871da177e4SLinus Torvalds port1, 4881da177e4SLinus Torvalds ({ char *s; switch (selector) { 4891da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 4901da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 4911da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 4921da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 4931da177e4SLinus Torvalds default: s = "??"; break; 4941da177e4SLinus Torvalds }; s; }), 4951da177e4SLinus Torvalds status); 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 4991da177e4SLinus Torvalds 500c4028958SDavid Howells static void led_work (struct work_struct *work) 5011da177e4SLinus Torvalds { 502c4028958SDavid Howells struct usb_hub *hub = 503c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 5041da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 5051da177e4SLinus Torvalds unsigned i; 5061da177e4SLinus Torvalds unsigned changed = 0; 5071da177e4SLinus Torvalds int cursor = -1; 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 5101da177e4SLinus Torvalds return; 5111da177e4SLinus Torvalds 5121da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 5131da177e4SLinus Torvalds unsigned selector, mode; 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds /* 30%-50% duty cycle */ 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds switch (hub->indicator[i]) { 5181da177e4SLinus Torvalds /* cycle marker */ 5191da177e4SLinus Torvalds case INDICATOR_CYCLE: 5201da177e4SLinus Torvalds cursor = i; 5211da177e4SLinus Torvalds selector = HUB_LED_AUTO; 5221da177e4SLinus Torvalds mode = INDICATOR_AUTO; 5231da177e4SLinus Torvalds break; 5241da177e4SLinus Torvalds /* blinking green = sw attention */ 5251da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 5261da177e4SLinus Torvalds selector = HUB_LED_GREEN; 5271da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 5281da177e4SLinus Torvalds break; 5291da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 5301da177e4SLinus Torvalds selector = HUB_LED_OFF; 5311da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 5321da177e4SLinus Torvalds break; 5331da177e4SLinus Torvalds /* blinking amber = hw attention */ 5341da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 5351da177e4SLinus Torvalds selector = HUB_LED_AMBER; 5361da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 5371da177e4SLinus Torvalds break; 5381da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 5391da177e4SLinus Torvalds selector = HUB_LED_OFF; 5401da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 5411da177e4SLinus Torvalds break; 5421da177e4SLinus Torvalds /* blink green/amber = reserved */ 5431da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 5441da177e4SLinus Torvalds selector = HUB_LED_GREEN; 5451da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 5461da177e4SLinus Torvalds break; 5471da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 5481da177e4SLinus Torvalds selector = HUB_LED_AMBER; 5491da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 5501da177e4SLinus Torvalds break; 5511da177e4SLinus Torvalds default: 5521da177e4SLinus Torvalds continue; 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 5551da177e4SLinus Torvalds changed = 1; 5561da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 5571da177e4SLinus Torvalds hub->indicator[i] = mode; 5581da177e4SLinus Torvalds } 5591da177e4SLinus Torvalds if (!changed && blinkenlights) { 5601da177e4SLinus Torvalds cursor++; 5611da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 5621da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 5631da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 5641da177e4SLinus Torvalds changed++; 5651da177e4SLinus Torvalds } 5661da177e4SLinus Torvalds if (changed) 5671da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 5681da177e4SLinus Torvalds } 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 5711da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 5721da177e4SLinus Torvalds #define USB_STS_RETRIES 5 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds /* 5751da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 5761da177e4SLinus Torvalds */ 5771da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 5781da177e4SLinus Torvalds struct usb_hub_status *data) 5791da177e4SLinus Torvalds { 5801da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5811da177e4SLinus Torvalds 5823824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5833824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5841da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5851da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 5861da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds return status; 5891da177e4SLinus Torvalds } 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds /* 5921da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 5931da177e4SLinus Torvalds */ 5941da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 5951da177e4SLinus Torvalds struct usb_port_status *data) 5961da177e4SLinus Torvalds { 5971da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5981da177e4SLinus Torvalds 5993824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 6003824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 6011da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 6021da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 6031da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 6041da177e4SLinus Torvalds } 6051da177e4SLinus Torvalds return status; 6061da177e4SLinus Torvalds } 6071da177e4SLinus Torvalds 6083eb14915SAlan Stern static int hub_port_status(struct usb_hub *hub, int port1, 6093eb14915SAlan Stern u16 *status, u16 *change) 6103eb14915SAlan Stern { 6113eb14915SAlan Stern int ret; 6123eb14915SAlan Stern 6133eb14915SAlan Stern mutex_lock(&hub->status_mutex); 6143eb14915SAlan Stern ret = get_port_status(hub->hdev, port1, &hub->status->port); 6153eb14915SAlan Stern if (ret < 4) { 6163eb14915SAlan Stern dev_err(hub->intfdev, 6173eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 6183eb14915SAlan Stern if (ret >= 0) 6193eb14915SAlan Stern ret = -EIO; 6203eb14915SAlan Stern } else { 6213eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 6223eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 623dbe79bbeSJohn Youn 6243eb14915SAlan Stern ret = 0; 6253eb14915SAlan Stern } 6263eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 6273eb14915SAlan Stern return ret; 6283eb14915SAlan Stern } 6293eb14915SAlan Stern 6301da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 6311da177e4SLinus Torvalds { 6321da177e4SLinus Torvalds unsigned long flags; 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 6352e2c5eeaSRoel Kluin if (!hub->disconnected && list_empty(&hub->event_list)) { 6361da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 6378e4ceb38SAlan Stern 6388e4ceb38SAlan Stern /* Suppress autosuspend until khubd runs */ 6398e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 6408e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 6411da177e4SLinus Torvalds wake_up(&khubd_wait); 6421da177e4SLinus Torvalds } 6431da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 6441da177e4SLinus Torvalds } 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 6471da177e4SLinus Torvalds { 64825118084SAlan Stern struct usb_hub *hub = hdev_to_hub(hdev); 64925118084SAlan Stern 65025118084SAlan Stern if (hub) 65125118084SAlan Stern kick_khubd(hub); 6521da177e4SLinus Torvalds } 6531da177e4SLinus Torvalds 6544ee823b8SSarah Sharp /* 6554ee823b8SSarah Sharp * Let the USB core know that a USB 3.0 device has sent a Function Wake Device 6564ee823b8SSarah Sharp * Notification, which indicates it had initiated remote wakeup. 6574ee823b8SSarah Sharp * 6584ee823b8SSarah Sharp * USB 3.0 hubs do not report the port link state change from U3 to U0 when the 6594ee823b8SSarah Sharp * device initiates resume, so the USB core will not receive notice of the 6604ee823b8SSarah Sharp * resume through the normal hub interrupt URB. 6614ee823b8SSarah Sharp */ 6624ee823b8SSarah Sharp void usb_wakeup_notification(struct usb_device *hdev, 6634ee823b8SSarah Sharp unsigned int portnum) 6644ee823b8SSarah Sharp { 6654ee823b8SSarah Sharp struct usb_hub *hub; 6664ee823b8SSarah Sharp 6674ee823b8SSarah Sharp if (!hdev) 6684ee823b8SSarah Sharp return; 6694ee823b8SSarah Sharp 6704ee823b8SSarah Sharp hub = hdev_to_hub(hdev); 6714ee823b8SSarah Sharp if (hub) { 6724ee823b8SSarah Sharp set_bit(portnum, hub->wakeup_bits); 6734ee823b8SSarah Sharp kick_khubd(hub); 6744ee823b8SSarah Sharp } 6754ee823b8SSarah Sharp } 6764ee823b8SSarah Sharp EXPORT_SYMBOL_GPL(usb_wakeup_notification); 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 6797d12e780SDavid Howells static void hub_irq(struct urb *urb) 6801da177e4SLinus Torvalds { 681ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 682e015268dSAlan Stern int status = urb->status; 68371d2718fSRoel Kluin unsigned i; 6841da177e4SLinus Torvalds unsigned long bits; 6851da177e4SLinus Torvalds 686e015268dSAlan Stern switch (status) { 6871da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 6881da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 6891da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 6901da177e4SLinus Torvalds return; 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds default: /* presumably an error */ 6931da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 694e015268dSAlan Stern dev_dbg (hub->intfdev, "transfer --> %d\n", status); 6951da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 6961da177e4SLinus Torvalds goto resubmit; 697e015268dSAlan Stern hub->error = status; 6981da177e4SLinus Torvalds /* FALL THROUGH */ 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds /* let khubd handle things */ 7011da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 7021da177e4SLinus Torvalds bits = 0; 7031da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 7041da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 7051da177e4SLinus Torvalds << (i*8); 7061da177e4SLinus Torvalds hub->event_bits[0] = bits; 7071da177e4SLinus Torvalds break; 7081da177e4SLinus Torvalds } 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds hub->nerrors = 0; 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 7131da177e4SLinus Torvalds kick_khubd(hub); 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds resubmit: 7161da177e4SLinus Torvalds if (hub->quiescing) 7171da177e4SLinus Torvalds return; 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 7201da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 7211da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 7221da177e4SLinus Torvalds } 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 7251da177e4SLinus Torvalds static inline int 7261da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 7271da177e4SLinus Torvalds { 728c2f6595fSAlan Stern return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 7291da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 7301da177e4SLinus Torvalds tt, NULL, 0, 1000); 7311da177e4SLinus Torvalds } 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds /* 7341da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 7351da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 7361da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 7371da177e4SLinus Torvalds * both can talk to the same hub concurrently. 7381da177e4SLinus Torvalds */ 739cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 7401da177e4SLinus Torvalds { 741c4028958SDavid Howells struct usb_hub *hub = 742cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 7431da177e4SLinus Torvalds unsigned long flags; 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 7463b6054daSOctavian Purdila while (!list_empty(&hub->tt.clear_list)) { 747d0f830d3SH Hartley Sweeten struct list_head *next; 7481da177e4SLinus Torvalds struct usb_tt_clear *clear; 7491da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 750cb88a1b8SAlan Stern const struct hc_driver *drv; 7511da177e4SLinus Torvalds int status; 7521da177e4SLinus Torvalds 753d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 754d0f830d3SH Hartley Sweeten clear = list_entry (next, struct usb_tt_clear, clear_list); 7551da177e4SLinus Torvalds list_del (&clear->clear_list); 7561da177e4SLinus Torvalds 7571da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 7581da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 7591da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 7601da177e4SLinus Torvalds if (status) 7611da177e4SLinus Torvalds dev_err (&hdev->dev, 7621da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 7631da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 764cb88a1b8SAlan Stern 765cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 766cb88a1b8SAlan Stern drv = clear->hcd->driver; 767cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 768cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 769cb88a1b8SAlan Stern 7701da177e4SLinus Torvalds kfree(clear); 771cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 7721da177e4SLinus Torvalds } 7731da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 7741da177e4SLinus Torvalds } 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds /** 777cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 778cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 7791da177e4SLinus Torvalds * 7801da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 7811da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 7821da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 7831da177e4SLinus Torvalds * interrupt context. 7841da177e4SLinus Torvalds * 7851da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 7861da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 7871da177e4SLinus Torvalds */ 788cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 7891da177e4SLinus Torvalds { 790cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 791cb88a1b8SAlan Stern int pipe = urb->pipe; 7921da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 7931da177e4SLinus Torvalds unsigned long flags; 7941da177e4SLinus Torvalds struct usb_tt_clear *clear; 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 7971da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 7981da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 7991da177e4SLinus Torvalds */ 80054e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 8011da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 8021da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 803cb88a1b8SAlan Stern return -ENOMEM; 8041da177e4SLinus Torvalds } 8051da177e4SLinus Torvalds 8061da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 8071da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 8081da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 8091da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 8101da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 8111da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 8121da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 8131da177e4SLinus Torvalds if (usb_pipein (pipe)) 8141da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 8151da177e4SLinus Torvalds 816cb88a1b8SAlan Stern /* info for completion callback */ 817cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 818cb88a1b8SAlan Stern clear->ep = urb->ep; 819cb88a1b8SAlan Stern 8201da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 8211da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 8221da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 823cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 8241da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 825cb88a1b8SAlan Stern return 0; 8261da177e4SLinus Torvalds } 827cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 8281da177e4SLinus Torvalds 8298520f380SAlan Stern /* If do_delay is false, return the number of milliseconds the caller 8308520f380SAlan Stern * needs to delay. 8318520f380SAlan Stern */ 8328520f380SAlan Stern static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) 8331da177e4SLinus Torvalds { 8341da177e4SLinus Torvalds int port1; 835b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 8368520f380SAlan Stern unsigned delay; 8374489a571SAlan Stern u16 wHubCharacteristics = 8384489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 8391da177e4SLinus Torvalds 8404489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 8414489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 8424489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 8434489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 8444489a571SAlan Stern * unless we send these messages to the hub. 8454489a571SAlan Stern */ 8464489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 8471da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 8484489a571SAlan Stern else 8494489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 8504489a571SAlan Stern "non-switchable hub\n"); 8511da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 8524489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 8531da177e4SLinus Torvalds 854b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 8558520f380SAlan Stern delay = max(pgood_delay, (unsigned) 100); 8568520f380SAlan Stern if (do_delay) 8578520f380SAlan Stern msleep(delay); 8588520f380SAlan Stern return delay; 8591da177e4SLinus Torvalds } 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 8621da177e4SLinus Torvalds u16 *status, u16 *change) 8631da177e4SLinus Torvalds { 8641da177e4SLinus Torvalds int ret; 8651da177e4SLinus Torvalds 866db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 8671da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 8681da177e4SLinus Torvalds if (ret < 0) 8691da177e4SLinus Torvalds dev_err (hub->intfdev, 870441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 8711da177e4SLinus Torvalds else { 8721da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 8731da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 8741da177e4SLinus Torvalds ret = 0; 8751da177e4SLinus Torvalds } 876db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 8771da177e4SLinus Torvalds return ret; 8781da177e4SLinus Torvalds } 8791da177e4SLinus Torvalds 8808b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 8818b28c752SAlan Stern { 8828b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 8830458d5b4SAlan Stern int ret = 0; 8848b28c752SAlan Stern 885ff823c79SLan Tianyu if (hub->ports[port1 - 1]->child && set_state) 886ff823c79SLan Tianyu usb_set_device_state(hub->ports[port1 - 1]->child, 8878b28c752SAlan Stern USB_STATE_NOTATTACHED); 888dbe79bbeSJohn Youn if (!hub->error && !hub_is_superspeed(hub->hdev)) 8898b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 8908b28c752SAlan Stern if (ret) 8918b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 8928b28c752SAlan Stern port1, ret); 8938b28c752SAlan Stern return ret; 8948b28c752SAlan Stern } 8958b28c752SAlan Stern 8960458d5b4SAlan Stern /* 8976d42fcdbSJustin P. Mattock * Disable a port and mark a logical connect-change event, so that some 8980458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 8990458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 9000458d5b4SAlan Stern */ 9010458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 9027d069b7dSAlan Stern { 9030458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 9040458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 9050458d5b4SAlan Stern 9060458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 9070458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 9080458d5b4SAlan Stern * - SRP saves power that way 9090458d5b4SAlan Stern * - ... new call, TBD ... 9100458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 9110458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 9120458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 9130458d5b4SAlan Stern */ 9140458d5b4SAlan Stern 9150458d5b4SAlan Stern set_bit(port1, hub->change_bits); 9160458d5b4SAlan Stern kick_khubd(hub); 9170458d5b4SAlan Stern } 9180458d5b4SAlan Stern 919253e0572SAlan Stern /** 920253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 921253e0572SAlan Stern * @udev: device to be disabled and removed 922253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 923253e0572SAlan Stern * 924253e0572SAlan Stern * After @udev's port has been disabled, khubd is notified and it will 925253e0572SAlan Stern * see that the device has been disconnected. When the device is 926253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 927253e0572SAlan Stern * be received and processed normally. 928253e0572SAlan Stern */ 929253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 930253e0572SAlan Stern { 931253e0572SAlan Stern struct usb_hub *hub; 932253e0572SAlan Stern struct usb_interface *intf; 933253e0572SAlan Stern 934253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 935253e0572SAlan Stern return -EINVAL; 936253e0572SAlan Stern hub = hdev_to_hub(udev->parent); 937253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 938253e0572SAlan Stern 939253e0572SAlan Stern usb_autopm_get_interface(intf); 940253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 941253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 942253e0572SAlan Stern usb_autopm_put_interface(intf); 943253e0572SAlan Stern return 0; 944253e0572SAlan Stern } 945253e0572SAlan Stern 9466ee0b270SAlan Stern enum hub_activation_type { 9478e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 9488520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 9496ee0b270SAlan Stern }; 9505e6effaeSAlan Stern 9518520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 9528520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 9538520f380SAlan Stern 954f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 9555e6effaeSAlan Stern { 9565e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 957653a39d1SSarah Sharp struct usb_hcd *hcd; 958653a39d1SSarah Sharp int ret; 9595e6effaeSAlan Stern int port1; 960f2835219SAlan Stern int status; 961948fea37SAlan Stern bool need_debounce_delay = false; 9628520f380SAlan Stern unsigned delay; 9638520f380SAlan Stern 9648520f380SAlan Stern /* Continue a partial initialization */ 9658520f380SAlan Stern if (type == HUB_INIT2) 9668520f380SAlan Stern goto init2; 9678520f380SAlan Stern if (type == HUB_INIT3) 9688520f380SAlan Stern goto init3; 9695e6effaeSAlan Stern 970a45aa3b3SElric Fu /* The superspeed hub except for root hub has to use Hub Depth 971a45aa3b3SElric Fu * value as an offset into the route string to locate the bits 972a45aa3b3SElric Fu * it uses to determine the downstream port number. So hub driver 973a45aa3b3SElric Fu * should send a set hub depth request to superspeed hub after 974a45aa3b3SElric Fu * the superspeed hub is set configuration in initialization or 975a45aa3b3SElric Fu * reset procedure. 976a45aa3b3SElric Fu * 977a45aa3b3SElric Fu * After a resume, port power should still be on. 978f2835219SAlan Stern * For any other type of activation, turn it on. 979f2835219SAlan Stern */ 9808520f380SAlan Stern if (type != HUB_RESUME) { 981a45aa3b3SElric Fu if (hdev->parent && hub_is_superspeed(hdev)) { 982a45aa3b3SElric Fu ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 983a45aa3b3SElric Fu HUB_SET_DEPTH, USB_RT_HUB, 984a45aa3b3SElric Fu hdev->level - 1, 0, NULL, 0, 985a45aa3b3SElric Fu USB_CTRL_SET_TIMEOUT); 986a45aa3b3SElric Fu if (ret < 0) 987a45aa3b3SElric Fu dev_err(hub->intfdev, 988a45aa3b3SElric Fu "set hub depth failed\n"); 989a45aa3b3SElric Fu } 9908520f380SAlan Stern 9918520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 9928520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 9938520f380SAlan Stern * and the implementation looks like a home-brewed sort of 9948520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 9958520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 9968520f380SAlan Stern * rather than as a module). It adds up. 9978520f380SAlan Stern * 9988520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 9998520f380SAlan Stern * because for those activation types the ports have to be 10008520f380SAlan Stern * operational when we return. In theory this could be done 10018520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 10028520f380SAlan Stern */ 10038520f380SAlan Stern if (type == HUB_INIT) { 10048520f380SAlan Stern delay = hub_power_on(hub, false); 10058520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); 10068520f380SAlan Stern schedule_delayed_work(&hub->init_work, 10078520f380SAlan Stern msecs_to_jiffies(delay)); 100861fbeba1SAlan Stern 100961fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 10108e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 10118e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 10128520f380SAlan Stern return; /* Continues at init2: below */ 1013653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 1014653a39d1SSarah Sharp /* The internal host controller state for the hub device 1015653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 1016653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 1017653a39d1SSarah Sharp */ 1018653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1019653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 1020653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1021653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 1022653a39d1SSarah Sharp if (ret < 0) { 1023653a39d1SSarah Sharp dev_err(hub->intfdev, "Host not " 1024653a39d1SSarah Sharp "accepting hub info " 1025653a39d1SSarah Sharp "update.\n"); 1026653a39d1SSarah Sharp dev_err(hub->intfdev, "LS/FS devices " 1027653a39d1SSarah Sharp "and hubs may not work " 1028653a39d1SSarah Sharp "under this hub\n."); 1029653a39d1SSarah Sharp } 1030653a39d1SSarah Sharp } 1031653a39d1SSarah Sharp hub_power_on(hub, true); 10328520f380SAlan Stern } else { 10338520f380SAlan Stern hub_power_on(hub, true); 10348520f380SAlan Stern } 10358520f380SAlan Stern } 10368520f380SAlan Stern init2: 1037f2835219SAlan Stern 10386ee0b270SAlan Stern /* Check each port and set hub->change_bits to let khubd know 10396ee0b270SAlan Stern * which ports need attention. 10405e6effaeSAlan Stern */ 10415e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 1042ff823c79SLan Tianyu struct usb_device *udev = hub->ports[port1 - 1]->child; 10435e6effaeSAlan Stern u16 portstatus, portchange; 10445e6effaeSAlan Stern 10456ee0b270SAlan Stern portstatus = portchange = 0; 10466ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 10476ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 10486ee0b270SAlan Stern dev_dbg(hub->intfdev, 10496ee0b270SAlan Stern "port %d: status %04x change %04x\n", 10506ee0b270SAlan Stern port1, portstatus, portchange); 10515e6effaeSAlan Stern 10526ee0b270SAlan Stern /* After anything other than HUB_RESUME (i.e., initialization 10536ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 10546ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 10556ee0b270SAlan Stern * and so should ports for which we have no usb_device. 10565e6effaeSAlan Stern */ 10576ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 10586ee0b270SAlan Stern type != HUB_RESUME || 10596ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 10606ee0b270SAlan Stern !udev || 10616ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 10629f0a6cd3SAndiry Xu /* 10639f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 10649f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 10659f0a6cd3SAndiry Xu * Do not disable USB3 protocol ports. 10669f0a6cd3SAndiry Xu */ 1067131dec34SSarah Sharp if (!hub_is_superspeed(hdev)) { 10689f0a6cd3SAndiry Xu clear_port_feature(hdev, port1, 10699f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 10706ee0b270SAlan Stern portstatus &= ~USB_PORT_STAT_ENABLE; 107185f0ff46SSarah Sharp } else { 107285f0ff46SSarah Sharp /* Pretend that power was lost for USB3 devs */ 107385f0ff46SSarah Sharp portstatus &= ~USB_PORT_STAT_ENABLE; 10746ee0b270SAlan Stern } 10759f0a6cd3SAndiry Xu } 10766ee0b270SAlan Stern 1077948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 1078948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 1079948fea37SAlan Stern need_debounce_delay = true; 1080948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 1081948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 1082948fea37SAlan Stern } 1083948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 1084948fea37SAlan Stern need_debounce_delay = true; 1085948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 1086948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 1087948fea37SAlan Stern } 108879c3dd81SDon Zickus if ((portchange & USB_PORT_STAT_C_BH_RESET) && 108979c3dd81SDon Zickus hub_is_superspeed(hub->hdev)) { 109079c3dd81SDon Zickus need_debounce_delay = true; 109179c3dd81SDon Zickus clear_port_feature(hub->hdev, port1, 109279c3dd81SDon Zickus USB_PORT_FEAT_C_BH_PORT_RESET); 109379c3dd81SDon Zickus } 1094253e0572SAlan Stern /* We can forget about a "removed" device when there's a 1095253e0572SAlan Stern * physical disconnect or the connect status changes. 1096253e0572SAlan Stern */ 1097253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 1098253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 1099253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 1100253e0572SAlan Stern 11016ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 11026ee0b270SAlan Stern /* Tell khubd to disconnect the device or 11036ee0b270SAlan Stern * check for a new connection 11046ee0b270SAlan Stern */ 11056ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 11066ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11076ee0b270SAlan Stern 11086ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 110972937e1eSSarah Sharp bool port_resumed = (portstatus & 111072937e1eSSarah Sharp USB_PORT_STAT_LINK_STATE) == 111172937e1eSSarah Sharp USB_SS_PORT_LS_U0; 11126ee0b270SAlan Stern /* The power session apparently survived the resume. 11136ee0b270SAlan Stern * If there was an overcurrent or suspend change 11146ee0b270SAlan Stern * (i.e., remote wakeup request), have khubd 111572937e1eSSarah Sharp * take care of it. Look at the port link state 111672937e1eSSarah Sharp * for USB 3.0 hubs, since they don't have a suspend 111772937e1eSSarah Sharp * change bit, and they don't set the port link change 111872937e1eSSarah Sharp * bit on device-initiated resume. 11196ee0b270SAlan Stern */ 112072937e1eSSarah Sharp if (portchange || (hub_is_superspeed(hub->hdev) && 112172937e1eSSarah Sharp port_resumed)) 11226ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11236ee0b270SAlan Stern 11246ee0b270SAlan Stern } else if (udev->persist_enabled) { 11256ee0b270SAlan Stern #ifdef CONFIG_PM 11265e6effaeSAlan Stern udev->reset_resume = 1; 11276ee0b270SAlan Stern #endif 11288808f00cSAlan Stern set_bit(port1, hub->change_bits); 11298808f00cSAlan Stern 11306ee0b270SAlan Stern } else { 11316ee0b270SAlan Stern /* The power session is gone; tell khubd */ 11326ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11336ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11345e6effaeSAlan Stern } 11355e6effaeSAlan Stern } 11365e6effaeSAlan Stern 1137948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 1138948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 1139948fea37SAlan Stern * ports all at once right now, instead of letting khubd do them 1140948fea37SAlan Stern * one at a time later on. 1141948fea37SAlan Stern * 1142948fea37SAlan Stern * If any port-status changes do occur during this delay, khubd 1143948fea37SAlan Stern * will see them later and handle them normally. 1144948fea37SAlan Stern */ 11458520f380SAlan Stern if (need_debounce_delay) { 11468520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 1147f2835219SAlan Stern 11488520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 11498520f380SAlan Stern if (type == HUB_INIT2) { 11508520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); 11518520f380SAlan Stern schedule_delayed_work(&hub->init_work, 11528520f380SAlan Stern msecs_to_jiffies(delay)); 11538520f380SAlan Stern return; /* Continues at init3: below */ 11548520f380SAlan Stern } else { 11558520f380SAlan Stern msleep(delay); 11568520f380SAlan Stern } 11578520f380SAlan Stern } 11588520f380SAlan Stern init3: 1159f2835219SAlan Stern hub->quiescing = 0; 1160f2835219SAlan Stern 1161f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 1162f2835219SAlan Stern if (status < 0) 1163f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 1164f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 1165f2835219SAlan Stern schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 1166f2835219SAlan Stern 1167f2835219SAlan Stern /* Scan all ports that need attention */ 1168f2835219SAlan Stern kick_khubd(hub); 11698e4ceb38SAlan Stern 11708e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 11718e4ceb38SAlan Stern if (type <= HUB_INIT3) 11728e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 11735e6effaeSAlan Stern } 11745e6effaeSAlan Stern 11758520f380SAlan Stern /* Implement the continuations for the delays above */ 11768520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 11778520f380SAlan Stern { 11788520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 11798520f380SAlan Stern 11808520f380SAlan Stern hub_activate(hub, HUB_INIT2); 11818520f380SAlan Stern } 11828520f380SAlan Stern 11838520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 11848520f380SAlan Stern { 11858520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 11868520f380SAlan Stern 11878520f380SAlan Stern hub_activate(hub, HUB_INIT3); 11888520f380SAlan Stern } 11898520f380SAlan Stern 11904330354fSAlan Stern enum hub_quiescing_type { 11914330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 11924330354fSAlan Stern }; 11934330354fSAlan Stern 11944330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 11954330354fSAlan Stern { 11964330354fSAlan Stern struct usb_device *hdev = hub->hdev; 11974330354fSAlan Stern int i; 11984330354fSAlan Stern 11998520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 12008520f380SAlan Stern 12014330354fSAlan Stern /* khubd and related activity won't re-trigger */ 12024330354fSAlan Stern hub->quiescing = 1; 12034330354fSAlan Stern 12044330354fSAlan Stern if (type != HUB_SUSPEND) { 12054330354fSAlan Stern /* Disconnect all the children */ 12064330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 1207ff823c79SLan Tianyu if (hub->ports[i]->child) 1208ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 12094330354fSAlan Stern } 12104330354fSAlan Stern } 12114330354fSAlan Stern 12124330354fSAlan Stern /* Stop khubd and related activity */ 12134330354fSAlan Stern usb_kill_urb(hub->urb); 12144330354fSAlan Stern if (hub->has_indicators) 12154330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 12164330354fSAlan Stern if (hub->tt.hub) 1217036546bfSOctavian Purdila flush_work(&hub->tt.clear_work); 12184330354fSAlan Stern } 12194330354fSAlan Stern 12203eb14915SAlan Stern /* caller has locked the hub device */ 12213eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 12223eb14915SAlan Stern { 12233eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12243eb14915SAlan Stern 12254330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 1226f07600cfSAlan Stern return 0; 12277d069b7dSAlan Stern } 12287d069b7dSAlan Stern 12297d069b7dSAlan Stern /* caller has locked the hub device */ 1230f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 12317d069b7dSAlan Stern { 12327de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12337de18d8bSAlan Stern 1234f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 1235f07600cfSAlan Stern return 0; 12367d069b7dSAlan Stern } 12377d069b7dSAlan Stern 1238fa2a9566SLan Tianyu static void usb_port_device_release(struct device *dev) 1239fa2a9566SLan Tianyu { 1240fa2a9566SLan Tianyu struct usb_port *port_dev = to_usb_port(dev); 1241fa2a9566SLan Tianyu 1242fa2a9566SLan Tianyu kfree(port_dev); 1243fa2a9566SLan Tianyu } 1244fa2a9566SLan Tianyu 1245fa2a9566SLan Tianyu static void usb_hub_remove_port_device(struct usb_hub *hub, 1246fa2a9566SLan Tianyu int port1) 1247fa2a9566SLan Tianyu { 1248fa2a9566SLan Tianyu device_unregister(&hub->ports[port1 - 1]->dev); 1249fa2a9566SLan Tianyu } 1250fa2a9566SLan Tianyu 1251fa2a9566SLan Tianyu struct device_type usb_port_device_type = { 1252fa2a9566SLan Tianyu .name = "usb_port", 1253fa2a9566SLan Tianyu .release = usb_port_device_release, 1254fa2a9566SLan Tianyu }; 1255fa2a9566SLan Tianyu 1256fa2a9566SLan Tianyu static int usb_hub_create_port_device(struct usb_hub *hub, 1257fa2a9566SLan Tianyu int port1) 1258fa2a9566SLan Tianyu { 1259fa2a9566SLan Tianyu struct usb_port *port_dev = NULL; 1260fa2a9566SLan Tianyu int retval; 1261fa2a9566SLan Tianyu 1262fa2a9566SLan Tianyu port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL); 1263fa2a9566SLan Tianyu if (!port_dev) { 1264fa2a9566SLan Tianyu retval = -ENOMEM; 1265fa2a9566SLan Tianyu goto exit; 1266fa2a9566SLan Tianyu } 1267fa2a9566SLan Tianyu 1268fa2a9566SLan Tianyu hub->ports[port1 - 1] = port_dev; 1269fa2a9566SLan Tianyu port_dev->dev.parent = hub->intfdev; 1270fa2a9566SLan Tianyu port_dev->dev.type = &usb_port_device_type; 1271fa2a9566SLan Tianyu dev_set_name(&port_dev->dev, "port%d", port1); 1272fa2a9566SLan Tianyu 1273fa2a9566SLan Tianyu retval = device_register(&port_dev->dev); 1274fa2a9566SLan Tianyu if (retval) 1275fa2a9566SLan Tianyu goto error_register; 1276fa2a9566SLan Tianyu return 0; 1277fa2a9566SLan Tianyu 1278fa2a9566SLan Tianyu error_register: 1279fa2a9566SLan Tianyu put_device(&port_dev->dev); 1280fa2a9566SLan Tianyu exit: 1281fa2a9566SLan Tianyu return retval; 1282fa2a9566SLan Tianyu } 1283fa2a9566SLan Tianyu 12841da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 12851da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 12861da177e4SLinus Torvalds { 1287b356b7c7SSarah Sharp struct usb_hcd *hcd; 12881da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 12891da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 12901da177e4SLinus Torvalds u16 hubstatus, hubchange; 129174ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 12921da177e4SLinus Torvalds unsigned int pipe; 1293fa2a9566SLan Tianyu int maxp, ret, i; 12947cbe5dcaSAlan Stern char *message = "out of memory"; 12951da177e4SLinus Torvalds 1296d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 12971da177e4SLinus Torvalds if (!hub->buffer) { 12981da177e4SLinus Torvalds ret = -ENOMEM; 12991da177e4SLinus Torvalds goto fail; 13001da177e4SLinus Torvalds } 13011da177e4SLinus Torvalds 13021da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 13031da177e4SLinus Torvalds if (!hub->status) { 13041da177e4SLinus Torvalds ret = -ENOMEM; 13051da177e4SLinus Torvalds goto fail; 13061da177e4SLinus Torvalds } 1307db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 13081da177e4SLinus Torvalds 13091da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 13101da177e4SLinus Torvalds if (!hub->descriptor) { 13111da177e4SLinus Torvalds ret = -ENOMEM; 13121da177e4SLinus Torvalds goto fail; 13131da177e4SLinus Torvalds } 13141da177e4SLinus Torvalds 13151da177e4SLinus Torvalds /* Request the entire hub descriptor. 13161da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 13171da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 13181da177e4SLinus Torvalds */ 1319dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 13201da177e4SLinus Torvalds if (ret < 0) { 13211da177e4SLinus Torvalds message = "can't read hub descriptor"; 13221da177e4SLinus Torvalds goto fail; 13231da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 13241da177e4SLinus Torvalds message = "hub has too many ports!"; 13251da177e4SLinus Torvalds ret = -ENODEV; 13261da177e4SLinus Torvalds goto fail; 13271da177e4SLinus Torvalds } 13281da177e4SLinus Torvalds 13291da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 13301da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 13311da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 13321da177e4SLinus Torvalds 1333fa2a9566SLan Tianyu hub->ports = kzalloc(hdev->maxchild * sizeof(struct usb_port *), 1334336c5c31SLan Tianyu GFP_KERNEL); 1335ff823c79SLan Tianyu if (!hub->ports) { 13367cbe5dcaSAlan Stern ret = -ENOMEM; 13377cbe5dcaSAlan Stern goto fail; 13387cbe5dcaSAlan Stern } 13397cbe5dcaSAlan Stern 134074ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 13411da177e4SLinus Torvalds 1342dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1343dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1344dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 13451da177e4SLinus Torvalds int i; 13461da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 13471da177e4SLinus Torvalds 13481da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 1349dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 13501da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 13511da177e4SLinus Torvalds ? 'F' : 'R'; 13521da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 13531da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 13541da177e4SLinus Torvalds } else 13551da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 13561da177e4SLinus Torvalds 135774ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 13587bf01185SAman Deep case HUB_CHAR_COMMON_LPSM: 13591da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 13601da177e4SLinus Torvalds break; 13617bf01185SAman Deep case HUB_CHAR_INDV_PORT_LPSM: 13621da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 13631da177e4SLinus Torvalds break; 13647bf01185SAman Deep case HUB_CHAR_NO_LPSM: 13657bf01185SAman Deep case HUB_CHAR_LPSM: 13661da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 13671da177e4SLinus Torvalds break; 13681da177e4SLinus Torvalds } 13691da177e4SLinus Torvalds 137074ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 13717bf01185SAman Deep case HUB_CHAR_COMMON_OCPM: 13721da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 13731da177e4SLinus Torvalds break; 13747bf01185SAman Deep case HUB_CHAR_INDV_PORT_OCPM: 13751da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 13761da177e4SLinus Torvalds break; 13777bf01185SAman Deep case HUB_CHAR_NO_OCPM: 13787bf01185SAman Deep case HUB_CHAR_OCPM: 13791da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 13801da177e4SLinus Torvalds break; 13811da177e4SLinus Torvalds } 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 13841da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 1385cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 13861da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 13877bf01185SAman Deep case USB_HUB_PR_FS: 13881da177e4SLinus Torvalds break; 13897bf01185SAman Deep case USB_HUB_PR_HS_SINGLE_TT: 13901da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 13911da177e4SLinus Torvalds hub->tt.hub = hdev; 13921da177e4SLinus Torvalds break; 13937bf01185SAman Deep case USB_HUB_PR_HS_MULTI_TT: 13941da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 13951da177e4SLinus Torvalds if (ret == 0) { 13961da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 13971da177e4SLinus Torvalds hub->tt.multi = 1; 13981da177e4SLinus Torvalds } else 13991da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 14001da177e4SLinus Torvalds ret); 14011da177e4SLinus Torvalds hub->tt.hub = hdev; 14021da177e4SLinus Torvalds break; 14037bf01185SAman Deep case USB_HUB_PR_SS: 1404d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1405d2e9b4d6SSarah Sharp break; 14061da177e4SLinus Torvalds default: 14071da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 14081da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 14091da177e4SLinus Torvalds break; 14101da177e4SLinus Torvalds } 14111da177e4SLinus Torvalds 1412e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 141374ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1414e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1415e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1416e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1417e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1418e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1419e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1420e09711aeSdavid-b@pacbell.net } 14211da177e4SLinus Torvalds break; 1422e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1423e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1424e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1425e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1426e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 14271da177e4SLinus Torvalds break; 1428e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1429e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1430e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1431e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1432e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 14331da177e4SLinus Torvalds break; 1434e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1435e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1436e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1437e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1438e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 14391da177e4SLinus Torvalds break; 14401da177e4SLinus Torvalds } 14411da177e4SLinus Torvalds 14421da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 144374ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 14441da177e4SLinus Torvalds hub->has_indicators = 1; 14451da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 14461da177e4SLinus Torvalds } 14471da177e4SLinus Torvalds 14481da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 14491da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 14501da177e4SLinus Torvalds 14511da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 14521da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 14531da177e4SLinus Torvalds */ 14541da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 145555c52718SAlan Stern if (ret < 2) { 14561da177e4SLinus Torvalds message = "can't get hub status"; 14571da177e4SLinus Torvalds goto fail; 14581da177e4SLinus Torvalds } 14597d35b929SAlan Stern le16_to_cpus(&hubstatus); 14607d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 146155c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 146255c52718SAlan Stern hub->mA_per_port = 500; 146355c52718SAlan Stern else { 146455c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 146555c52718SAlan Stern hub->limited_power = 1; 146655c52718SAlan Stern } 14677d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 14681da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 14691da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 147055c52718SAlan Stern hub->limited_power = 1; 147155c52718SAlan Stern if (hdev->maxchild > 0) { 147255c52718SAlan Stern int remaining = hdev->bus_mA - 147355c52718SAlan Stern hub->descriptor->bHubContrCurrent; 14741da177e4SLinus Torvalds 147555c52718SAlan Stern if (remaining < hdev->maxchild * 100) 147655c52718SAlan Stern dev_warn(hub_dev, 147755c52718SAlan Stern "insufficient power available " 147855c52718SAlan Stern "to use all downstream ports\n"); 147955c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 148055c52718SAlan Stern } 148155c52718SAlan Stern } else { /* Self-powered external hub */ 148255c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 148355c52718SAlan Stern * provide less current per port? */ 148455c52718SAlan Stern hub->mA_per_port = 500; 148555c52718SAlan Stern } 148655c52718SAlan Stern if (hub->mA_per_port < 500) 148755c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 148855c52718SAlan Stern hub->mA_per_port); 14891da177e4SLinus Torvalds 1490b356b7c7SSarah Sharp /* Update the HCD's internal representation of this hub before khubd 1491b356b7c7SSarah Sharp * starts getting port status changes for devices under the hub. 1492b356b7c7SSarah Sharp */ 1493b356b7c7SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1494b356b7c7SSarah Sharp if (hcd->driver->update_hub_device) { 1495b356b7c7SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1496b356b7c7SSarah Sharp &hub->tt, GFP_KERNEL); 1497b356b7c7SSarah Sharp if (ret < 0) { 1498b356b7c7SSarah Sharp message = "can't update HCD hub info"; 1499b356b7c7SSarah Sharp goto fail; 1500b356b7c7SSarah Sharp } 1501b356b7c7SSarah Sharp } 1502b356b7c7SSarah Sharp 15031da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 15041da177e4SLinus Torvalds if (ret < 0) { 15051da177e4SLinus Torvalds message = "can't get hub status"; 15061da177e4SLinus Torvalds goto fail; 15071da177e4SLinus Torvalds } 15081da177e4SLinus Torvalds 15091da177e4SLinus Torvalds /* local power status reports aren't always correct */ 15101da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 15111da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 15121da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 15131da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 15141da177e4SLinus Torvalds 151574ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 15161da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 15171da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 15181da177e4SLinus Torvalds 151988fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 152088fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 152188fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 152288fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 152388fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 152488fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 15251da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 15261da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 15271da177e4SLinus Torvalds 15281da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 15291da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 15301da177e4SLinus Torvalds 15311da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 15321da177e4SLinus Torvalds if (!hub->urb) { 15331da177e4SLinus Torvalds ret = -ENOMEM; 15341da177e4SLinus Torvalds goto fail; 15351da177e4SLinus Torvalds } 15361da177e4SLinus Torvalds 15371da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 15381da177e4SLinus Torvalds hub, endpoint->bInterval); 15391da177e4SLinus Torvalds 15401da177e4SLinus Torvalds /* maybe cycle the hub leds */ 15411da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 15421da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 15431da177e4SLinus Torvalds 1544fa2a9566SLan Tianyu for (i = 0; i < hdev->maxchild; i++) 1545fa2a9566SLan Tianyu if (usb_hub_create_port_device(hub, i + 1) < 0) 1546fa2a9566SLan Tianyu dev_err(hub->intfdev, 1547fa2a9566SLan Tianyu "couldn't create port%d device.\n", i + 1); 1548fa2a9566SLan Tianyu 1549f2835219SAlan Stern hub_activate(hub, HUB_INIT); 15501da177e4SLinus Torvalds return 0; 15511da177e4SLinus Torvalds 15521da177e4SLinus Torvalds fail: 15531da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 15541da177e4SLinus Torvalds message, ret); 15551da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 15561da177e4SLinus Torvalds return ret; 15571da177e4SLinus Torvalds } 15581da177e4SLinus Torvalds 1559e8054854SAlan Stern static void hub_release(struct kref *kref) 1560e8054854SAlan Stern { 1561e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1562e8054854SAlan Stern 1563e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1564e8054854SAlan Stern kfree(hub); 1565e8054854SAlan Stern } 1566e8054854SAlan Stern 15671da177e4SLinus Torvalds static unsigned highspeed_hubs; 15681da177e4SLinus Torvalds 15691da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 15701da177e4SLinus Torvalds { 15711da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 1572fa286188SGreg Kroah-Hartman struct usb_device *hdev = interface_to_usbdev(intf); 1573fa2a9566SLan Tianyu int i; 1574fa2a9566SLan Tianyu 1575e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 1576e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 15778e4ceb38SAlan Stern if (!list_empty(&hub->event_list)) { 1578e8054854SAlan Stern list_del_init(&hub->event_list); 15798e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 15808e4ceb38SAlan Stern } 1581e8054854SAlan Stern hub->disconnected = 1; 1582e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 15831da177e4SLinus Torvalds 15847de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 15857de18d8bSAlan Stern hub->error = 0; 15864330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 15877de18d8bSAlan Stern 15888b28c752SAlan Stern usb_set_intfdata (intf, NULL); 15891f2235b8SAlexander Shishkin 15901f2235b8SAlexander Shishkin for (i = 0; i < hdev->maxchild; i++) 15911f2235b8SAlexander Shishkin usb_hub_remove_port_device(hub, i + 1); 15927cbe5dcaSAlan Stern hub->hdev->maxchild = 0; 15931da177e4SLinus Torvalds 1594e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 15951da177e4SLinus Torvalds highspeed_hubs--; 15961da177e4SLinus Torvalds 15971da177e4SLinus Torvalds usb_free_urb(hub->urb); 1598fa2a9566SLan Tianyu kfree(hub->ports); 15991da177e4SLinus Torvalds kfree(hub->descriptor); 16001da177e4SLinus Torvalds kfree(hub->status); 1601d697cddaSAlan Stern kfree(hub->buffer); 16021da177e4SLinus Torvalds 1603e8054854SAlan Stern kref_put(&hub->kref, hub_release); 16041da177e4SLinus Torvalds } 16051da177e4SLinus Torvalds 16061da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 16071da177e4SLinus Torvalds { 16081da177e4SLinus Torvalds struct usb_host_interface *desc; 16091da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 16101da177e4SLinus Torvalds struct usb_device *hdev; 16111da177e4SLinus Torvalds struct usb_hub *hub; 16121da177e4SLinus Torvalds 16131da177e4SLinus Torvalds desc = intf->cur_altsetting; 16141da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 16151da177e4SLinus Torvalds 1616596d789aSMing Lei /* 1617596d789aSMing Lei * Set default autosuspend delay as 0 to speedup bus suspend, 1618596d789aSMing Lei * based on the below considerations: 1619596d789aSMing Lei * 1620596d789aSMing Lei * - Unlike other drivers, the hub driver does not rely on the 1621596d789aSMing Lei * autosuspend delay to provide enough time to handle a wakeup 1622596d789aSMing Lei * event, and the submitted status URB is just to check future 1623596d789aSMing Lei * change on hub downstream ports, so it is safe to do it. 1624596d789aSMing Lei * 1625596d789aSMing Lei * - The patch might cause one or more auto supend/resume for 1626596d789aSMing Lei * below very rare devices when they are plugged into hub 1627596d789aSMing Lei * first time: 1628596d789aSMing Lei * 1629596d789aSMing Lei * devices having trouble initializing, and disconnect 1630596d789aSMing Lei * themselves from the bus and then reconnect a second 1631596d789aSMing Lei * or so later 1632596d789aSMing Lei * 1633596d789aSMing Lei * devices just for downloading firmware, and disconnects 1634596d789aSMing Lei * themselves after completing it 1635596d789aSMing Lei * 1636596d789aSMing Lei * For these quite rare devices, their drivers may change the 1637596d789aSMing Lei * autosuspend delay of their parent hub in the probe() to one 1638596d789aSMing Lei * appropriate value to avoid the subtle problem if someone 1639596d789aSMing Lei * does care it. 1640596d789aSMing Lei * 1641596d789aSMing Lei * - The patch may cause one or more auto suspend/resume on 1642596d789aSMing Lei * hub during running 'lsusb', but it is probably too 1643596d789aSMing Lei * infrequent to worry about. 1644596d789aSMing Lei * 1645596d789aSMing Lei * - Change autosuspend delay of hub can avoid unnecessary auto 1646596d789aSMing Lei * suspend timer for hub, also may decrease power consumption 1647596d789aSMing Lei * of USB bus. 1648596d789aSMing Lei */ 1649596d789aSMing Lei pm_runtime_set_autosuspend_delay(&hdev->dev, 0); 1650596d789aSMing Lei 16512839f5bcSSarah Sharp /* Hubs have proper suspend/resume support. */ 1652088f7fecSAlan Stern usb_enable_autosuspend(hdev); 1653088f7fecSAlan Stern 165438f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1655b9cef6c3SWu Fengguang dev_err(&intf->dev, 1656b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 165738f3ad5eSFelipe Balbi return -E2BIG; 165838f3ad5eSFelipe Balbi } 165938f3ad5eSFelipe Balbi 166089ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 166189ccbdc9SDavid Brownell if (hdev->parent) { 166289ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 166389ccbdc9SDavid Brownell return -ENODEV; 166489ccbdc9SDavid Brownell } 166589ccbdc9SDavid Brownell #endif 166689ccbdc9SDavid Brownell 16671da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 16681da177e4SLinus Torvalds /* specs is not defined, but it works */ 16691da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 16701da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 16711da177e4SLinus Torvalds descriptor_error: 16721da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 16731da177e4SLinus Torvalds return -EIO; 16741da177e4SLinus Torvalds } 16751da177e4SLinus Torvalds 16761da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 16771da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 16781da177e4SLinus Torvalds goto descriptor_error; 16791da177e4SLinus Torvalds 16801da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 16811da177e4SLinus Torvalds 1682fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1683fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 16841da177e4SLinus Torvalds goto descriptor_error; 16851da177e4SLinus Torvalds 16861da177e4SLinus Torvalds /* We found a hub */ 16871da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 16881da177e4SLinus Torvalds 16890a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 16901da177e4SLinus Torvalds if (!hub) { 16911da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 16921da177e4SLinus Torvalds return -ENOMEM; 16931da177e4SLinus Torvalds } 16941da177e4SLinus Torvalds 1695e8054854SAlan Stern kref_init(&hub->kref); 16961da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 16971da177e4SLinus Torvalds hub->intfdev = &intf->dev; 16981da177e4SLinus Torvalds hub->hdev = hdev; 1699c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 17008520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 1701e8054854SAlan Stern usb_get_intf(intf); 17021da177e4SLinus Torvalds 17031da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 170440f122f3SAlan Stern intf->needs_remote_wakeup = 1; 17051da177e4SLinus Torvalds 17061da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 17071da177e4SLinus Torvalds highspeed_hubs++; 17081da177e4SLinus Torvalds 1709e6f30deaSMing Lei if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) 1710e6f30deaSMing Lei hub->quirk_check_port_auto_suspend = 1; 1711e6f30deaSMing Lei 17121da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 17131da177e4SLinus Torvalds return 0; 17141da177e4SLinus Torvalds 17151da177e4SLinus Torvalds hub_disconnect (intf); 17161da177e4SLinus Torvalds return -ENODEV; 17171da177e4SLinus Torvalds } 17181da177e4SLinus Torvalds 17191da177e4SLinus Torvalds static int 17201da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 17211da177e4SLinus Torvalds { 17221da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 1723ff823c79SLan Tianyu struct usb_hub *hub = hdev_to_hub(hdev); 17241da177e4SLinus Torvalds 17251da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 17261da177e4SLinus Torvalds switch (code) { 17271da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 17281da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 17291da177e4SLinus Torvalds int i; 17301da177e4SLinus Torvalds 17311da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 17321da177e4SLinus Torvalds if (hdev->devnum <= 0) 17331da177e4SLinus Torvalds info->nports = 0; 17341da177e4SLinus Torvalds else { 17351da177e4SLinus Torvalds info->nports = hdev->maxchild; 17361da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 1737ff823c79SLan Tianyu if (hub->ports[i]->child == NULL) 17381da177e4SLinus Torvalds info->port[i] = 0; 17391da177e4SLinus Torvalds else 17401da177e4SLinus Torvalds info->port[i] = 1741ff823c79SLan Tianyu hub->ports[i]->child->devnum; 17421da177e4SLinus Torvalds } 17431da177e4SLinus Torvalds } 17441da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 17451da177e4SLinus Torvalds 17461da177e4SLinus Torvalds return info->nports + 1; 17471da177e4SLinus Torvalds } 17481da177e4SLinus Torvalds 17491da177e4SLinus Torvalds default: 17501da177e4SLinus Torvalds return -ENOSYS; 17511da177e4SLinus Torvalds } 17521da177e4SLinus Torvalds } 17531da177e4SLinus Torvalds 17547cbe5dcaSAlan Stern /* 17557cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 17567cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 17577cbe5dcaSAlan Stern */ 17587cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 1759336c5c31SLan Tianyu struct dev_state ***ppowner) 17607cbe5dcaSAlan Stern { 17617cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 17627cbe5dcaSAlan Stern return -ENODEV; 17637cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 17647cbe5dcaSAlan Stern return -EINVAL; 17657cbe5dcaSAlan Stern 17667cbe5dcaSAlan Stern /* This assumes that devices not managed by the hub driver 17677cbe5dcaSAlan Stern * will always have maxchild equal to 0. 17687cbe5dcaSAlan Stern */ 1769fa2a9566SLan Tianyu *ppowner = &(hdev_to_hub(hdev)->ports[port1 - 1]->port_owner); 17707cbe5dcaSAlan Stern return 0; 17717cbe5dcaSAlan Stern } 17727cbe5dcaSAlan Stern 17737cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 1774336c5c31SLan Tianyu int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, 1775336c5c31SLan Tianyu struct dev_state *owner) 17767cbe5dcaSAlan Stern { 17777cbe5dcaSAlan Stern int rc; 1778336c5c31SLan Tianyu struct dev_state **powner; 17797cbe5dcaSAlan Stern 17807cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 17817cbe5dcaSAlan Stern if (rc) 17827cbe5dcaSAlan Stern return rc; 17837cbe5dcaSAlan Stern if (*powner) 17847cbe5dcaSAlan Stern return -EBUSY; 17857cbe5dcaSAlan Stern *powner = owner; 17867cbe5dcaSAlan Stern return rc; 17877cbe5dcaSAlan Stern } 17887cbe5dcaSAlan Stern 1789336c5c31SLan Tianyu int usb_hub_release_port(struct usb_device *hdev, unsigned port1, 1790336c5c31SLan Tianyu struct dev_state *owner) 17917cbe5dcaSAlan Stern { 17927cbe5dcaSAlan Stern int rc; 1793336c5c31SLan Tianyu struct dev_state **powner; 17947cbe5dcaSAlan Stern 17957cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 17967cbe5dcaSAlan Stern if (rc) 17977cbe5dcaSAlan Stern return rc; 17987cbe5dcaSAlan Stern if (*powner != owner) 17997cbe5dcaSAlan Stern return -ENOENT; 18007cbe5dcaSAlan Stern *powner = NULL; 18017cbe5dcaSAlan Stern return rc; 18027cbe5dcaSAlan Stern } 18037cbe5dcaSAlan Stern 1804336c5c31SLan Tianyu void usb_hub_release_all_ports(struct usb_device *hdev, struct dev_state *owner) 18057cbe5dcaSAlan Stern { 1806fa2a9566SLan Tianyu struct usb_hub *hub = hdev_to_hub(hdev); 18077cbe5dcaSAlan Stern int n; 18087cbe5dcaSAlan Stern 1809fa2a9566SLan Tianyu for (n = 0; n < hdev->maxchild; n++) { 1810fa2a9566SLan Tianyu if (hub->ports[n]->port_owner == owner) 1811fa2a9566SLan Tianyu hub->ports[n]->port_owner = NULL; 18127cbe5dcaSAlan Stern } 1813fa2a9566SLan Tianyu 18147cbe5dcaSAlan Stern } 18157cbe5dcaSAlan Stern 18167cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 18177cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 18187cbe5dcaSAlan Stern { 18197cbe5dcaSAlan Stern struct usb_hub *hub; 18207cbe5dcaSAlan Stern 18217cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 18227cbe5dcaSAlan Stern return false; 18237cbe5dcaSAlan Stern hub = hdev_to_hub(udev->parent); 1824fa2a9566SLan Tianyu return !!hub->ports[udev->portnum - 1]->port_owner; 18257cbe5dcaSAlan Stern } 18267cbe5dcaSAlan Stern 18271da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 18281da177e4SLinus Torvalds { 1829ff823c79SLan Tianyu struct usb_hub *hub = hdev_to_hub(udev); 18301da177e4SLinus Torvalds int i; 18311da177e4SLinus Torvalds 18321da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 1833ff823c79SLan Tianyu if (hub->ports[i]->child) 1834ff823c79SLan Tianyu recursively_mark_NOTATTACHED(hub->ports[i]->child); 18351da177e4SLinus Torvalds } 18369bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 183715123006SSarah Sharp udev->active_duration -= jiffies; 18381da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 18391da177e4SLinus Torvalds } 18401da177e4SLinus Torvalds 18411da177e4SLinus Torvalds /** 18421da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 18431da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 18441da177e4SLinus Torvalds * @new_state: new state value to be stored 18451da177e4SLinus Torvalds * 18461da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 18471da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 18481da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 18491da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 18501da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 18511da177e4SLinus Torvalds * all changes to any device's state must be protected by the 18521da177e4SLinus Torvalds * device_state_lock spinlock. 18531da177e4SLinus Torvalds * 18541da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 18551da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 18561da177e4SLinus Torvalds * 18571da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 18581da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 18591da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 18601da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 18611da177e4SLinus Torvalds */ 18621da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 18631da177e4SLinus Torvalds enum usb_device_state new_state) 18641da177e4SLinus Torvalds { 18651da177e4SLinus Torvalds unsigned long flags; 18664681b171SRafael J. Wysocki int wakeup = -1; 18671da177e4SLinus Torvalds 18681da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 18691da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 18701da177e4SLinus Torvalds ; /* do nothing */ 1871b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1872fb669cc0SDavid Brownell 1873fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1874fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1875fb669cc0SDavid Brownell */ 1876fb669cc0SDavid Brownell if (udev->parent) { 1877645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1878645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1879645daaabSAlan Stern ; /* No change to wakeup settings */ 1880645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 18814681b171SRafael J. Wysocki wakeup = udev->actconfig->desc.bmAttributes 18824681b171SRafael J. Wysocki & USB_CONFIG_ATT_WAKEUP; 1883645daaabSAlan Stern else 18844681b171SRafael J. Wysocki wakeup = 0; 1885fb669cc0SDavid Brownell } 188615123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 188715123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 188815123006SSarah Sharp udev->active_duration -= jiffies; 188915123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 189015123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 189115123006SSarah Sharp udev->active_duration += jiffies; 1892645daaabSAlan Stern udev->state = new_state; 1893b94dc6b5SDavid Brownell } else 18941da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 18951da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 18964681b171SRafael J. Wysocki if (wakeup >= 0) 18974681b171SRafael J. Wysocki device_set_wakeup_capable(&udev->dev, wakeup); 18981da177e4SLinus Torvalds } 18996da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 19001da177e4SLinus Torvalds 19018af548dcSInaky Perez-Gonzalez /* 19023b29b68bSAlan Stern * Choose a device number. 19033b29b68bSAlan Stern * 19043b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 19053b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 19063b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 19073b29b68bSAlan Stern * and it usually is not the same as the device number. 19083b29b68bSAlan Stern * 19098af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 19108af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 19118af548dcSInaky Perez-Gonzalez * life of the device connection logic in 19128af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 19138af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 19148af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 19158af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 19168af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 19178af548dcSInaky Perez-Gonzalez * [X | 0x80]. 19188af548dcSInaky Perez-Gonzalez * 19198af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 19208af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 19218af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 19228af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 19238af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 1924c6515272SSarah Sharp * 1925c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 1926c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 1927c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 1928c6515272SSarah Sharp * command to the hardware. 19298af548dcSInaky Perez-Gonzalez */ 19303b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 19311da177e4SLinus Torvalds { 19321da177e4SLinus Torvalds int devnum; 19331da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 19341da177e4SLinus Torvalds 19351da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 19368af548dcSInaky Perez-Gonzalez if (udev->wusb) { 19378af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 19388af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 19398af548dcSInaky Perez-Gonzalez } else { 19408af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 19418af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 19421da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 19431da177e4SLinus Torvalds bus->devnum_next); 19441da177e4SLinus Torvalds if (devnum >= 128) 19458af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 19468af548dcSInaky Perez-Gonzalez 128, 1); 19471da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 19488af548dcSInaky Perez-Gonzalez } 19491da177e4SLinus Torvalds if (devnum < 128) { 19501da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 19511da177e4SLinus Torvalds udev->devnum = devnum; 19521da177e4SLinus Torvalds } 19531da177e4SLinus Torvalds } 19541da177e4SLinus Torvalds 19553b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 19561da177e4SLinus Torvalds { 19571da177e4SLinus Torvalds if (udev->devnum > 0) { 19581da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 19591da177e4SLinus Torvalds udev->devnum = -1; 19601da177e4SLinus Torvalds } 19611da177e4SLinus Torvalds } 19621da177e4SLinus Torvalds 19633b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 19644953d141SDavid Vrabel { 19654953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 19664953d141SDavid Vrabel if (!udev->wusb) 19674953d141SDavid Vrabel udev->devnum = devnum; 19684953d141SDavid Vrabel } 19694953d141SDavid Vrabel 1970f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 1971f7410cedSHerbert Xu { 1972f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 1973f7410cedSHerbert Xu 1974f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 1975f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 1976f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 1977f7410cedSHerbert Xu } 1978f7410cedSHerbert Xu 19791da177e4SLinus Torvalds /** 19801da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 19811da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 19821da177e4SLinus Torvalds * Context: !in_interrupt () 19831da177e4SLinus Torvalds * 19841da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 19851da177e4SLinus Torvalds * 19861da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 19871da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 19881da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 19891da177e4SLinus Torvalds * 19901da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 19911da177e4SLinus Torvalds * controllers) should ever call this. 19921da177e4SLinus Torvalds * 19931da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 19941da177e4SLinus Torvalds */ 19951da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 19961da177e4SLinus Torvalds { 19971da177e4SLinus Torvalds struct usb_device *udev = *pdev; 1998ff823c79SLan Tianyu struct usb_hub *hub = hdev_to_hub(udev); 19991da177e4SLinus Torvalds int i; 20001da177e4SLinus Torvalds 20011da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 20021da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 200325985edcSLucas De Marchi * this quiesces everything except pending urbs. 20041da177e4SLinus Torvalds */ 20051da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 20063b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 20073b29b68bSAlan Stern udev->devnum); 20081da177e4SLinus Torvalds 20099ad3d6ccSAlan Stern usb_lock_device(udev); 20109ad3d6ccSAlan Stern 20111da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 20128816230eSHuajun Li for (i = 0; i < udev->maxchild; i++) { 2013ff823c79SLan Tianyu if (hub->ports[i]->child) 2014ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 20151da177e4SLinus Torvalds } 20161da177e4SLinus Torvalds 20171da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 20181da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 20191da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 20201da177e4SLinus Torvalds */ 2021782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 20221da177e4SLinus Torvalds usb_disable_device(udev, 0); 2023cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 20241da177e4SLinus Torvalds 20253b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 2026782da727SAlan Stern usb_unlock_device(udev); 20273099e75aSGreg Kroah-Hartman 2028782da727SAlan Stern /* Unregister the device. The device driver is responsible 20293b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 20303b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2031782da727SAlan Stern */ 2032782da727SAlan Stern device_del(&udev->dev); 2033782da727SAlan Stern 2034782da727SAlan Stern /* Free the device number and delete the parent's children[] 20351da177e4SLinus Torvalds * (or root_hub) pointer. 20361da177e4SLinus Torvalds */ 20373b29b68bSAlan Stern release_devnum(udev); 20381da177e4SLinus Torvalds 20391da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 20401da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 20411da177e4SLinus Torvalds *pdev = NULL; 20421da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 20431da177e4SLinus Torvalds 2044f7410cedSHerbert Xu hub_free_dev(udev); 2045f7410cedSHerbert Xu 2046782da727SAlan Stern put_device(&udev->dev); 20471da177e4SLinus Torvalds } 20481da177e4SLinus Torvalds 2049f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 20501da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 20511da177e4SLinus Torvalds { 20521da177e4SLinus Torvalds if (!string) 20531da177e4SLinus Torvalds return; 2054f2ec522eSJoe Perches dev_info(&udev->dev, "%s: %s\n", id, string); 20551da177e4SLinus Torvalds } 20561da177e4SLinus Torvalds 2057f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 2058f2a383e4SGreg Kroah-Hartman { 2059f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 2060f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 2061f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 2062b9cef6c3SWu Fengguang dev_info(&udev->dev, 2063b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 2064f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 2065f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 2066f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 2067f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 2068f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 2069f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 2070f2a383e4SGreg Kroah-Hartman } 20711da177e4SLinus Torvalds #else 2072f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 20731da177e4SLinus Torvalds #endif 20741da177e4SLinus Torvalds 20751da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 20761da177e4SLinus Torvalds #include "otg_whitelist.h" 20771da177e4SLinus Torvalds #endif 20781da177e4SLinus Torvalds 20793ede760fSOliver Neukum /** 20808d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 20813ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 20823ede760fSOliver Neukum * 20838d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 20843ede760fSOliver Neukum */ 20858d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 20861da177e4SLinus Torvalds { 2087d9d16e8aSInaky Perez-Gonzalez int err = 0; 20881da177e4SLinus Torvalds 20891da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 20901da177e4SLinus Torvalds /* 20911da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 20921da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 20931da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 20941da177e4SLinus Torvalds */ 20951da177e4SLinus Torvalds if (!udev->bus->is_b_host 20961da177e4SLinus Torvalds && udev->config 20971da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 20982eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 20991da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 21001da177e4SLinus Torvalds 21011da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 21021da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 21031da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 21041da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 21051da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 210612c3da34SAlan Stern unsigned port1 = udev->portnum; 21071da177e4SLinus Torvalds 21081da177e4SLinus Torvalds dev_info(&udev->dev, 21091da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 21101da177e4SLinus Torvalds (port1 == bus->otg_port) 21111da177e4SLinus Torvalds ? "" : "non-"); 21121da177e4SLinus Torvalds 21131da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 21141da177e4SLinus Torvalds if (port1 == bus->otg_port) 21151da177e4SLinus Torvalds bus->b_hnp_enable = 1; 21161da177e4SLinus Torvalds err = usb_control_msg(udev, 21171da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 21181da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 21191da177e4SLinus Torvalds bus->b_hnp_enable 21201da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 21211da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 21221da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 21231da177e4SLinus Torvalds if (err < 0) { 21241da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 21251da177e4SLinus Torvalds * customize to match your product. 21261da177e4SLinus Torvalds */ 21271da177e4SLinus Torvalds dev_info(&udev->dev, 2128b9cef6c3SWu Fengguang "can't set HNP mode: %d\n", 21291da177e4SLinus Torvalds err); 21301da177e4SLinus Torvalds bus->b_hnp_enable = 0; 21311da177e4SLinus Torvalds } 21321da177e4SLinus Torvalds } 21331da177e4SLinus Torvalds } 21341da177e4SLinus Torvalds } 21351da177e4SLinus Torvalds 21361da177e4SLinus Torvalds if (!is_targeted(udev)) { 21371da177e4SLinus Torvalds 21381da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 21391da177e4SLinus Torvalds * (Includes HNP test device.) 21401da177e4SLinus Torvalds */ 21411da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 2142634a84f8SDavid Brownell err = usb_port_suspend(udev, PMSG_SUSPEND); 21431da177e4SLinus Torvalds if (err < 0) 21441da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 21451da177e4SLinus Torvalds } 2146ffcdc18dSVikram Pandita err = -ENOTSUPP; 21471da177e4SLinus Torvalds goto fail; 21481da177e4SLinus Torvalds } 2149d9d16e8aSInaky Perez-Gonzalez fail: 21501da177e4SLinus Torvalds #endif 2151d9d16e8aSInaky Perez-Gonzalez return err; 2152d9d16e8aSInaky Perez-Gonzalez } 21531da177e4SLinus Torvalds 2154d9d16e8aSInaky Perez-Gonzalez 2155d9d16e8aSInaky Perez-Gonzalez /** 21568d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 2157d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2158d9d16e8aSInaky Perez-Gonzalez * 2159d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 2160d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 2161d9d16e8aSInaky Perez-Gonzalez * environment. 2162d9d16e8aSInaky Perez-Gonzalez * 2163d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 2164d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 2165d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 2166d9d16e8aSInaky Perez-Gonzalez */ 21678d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 2168d9d16e8aSInaky Perez-Gonzalez { 2169d9d16e8aSInaky Perez-Gonzalez int err; 2170d9d16e8aSInaky Perez-Gonzalez 2171d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 2172d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 2173d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 2174d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 2175d9d16e8aSInaky Perez-Gonzalez err); 217680da2e0dSLaurent Pinchart return err; 2177d9d16e8aSInaky Perez-Gonzalez } 2178d9d16e8aSInaky Perez-Gonzalez } 2179d9d16e8aSInaky Perez-Gonzalez if (udev->wusb == 1 && udev->authorized == 0) { 2180d9d16e8aSInaky Perez-Gonzalez udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2181d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2182d9d16e8aSInaky Perez-Gonzalez udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2183d9d16e8aSInaky Perez-Gonzalez } 2184d9d16e8aSInaky Perez-Gonzalez else { 2185d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 2186d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 2187d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 2188d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 2189d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 2190d9d16e8aSInaky Perez-Gonzalez } 21918d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 219280da2e0dSLaurent Pinchart if (err < 0) 2193d9d16e8aSInaky Perez-Gonzalez return err; 219480da2e0dSLaurent Pinchart 219580da2e0dSLaurent Pinchart usb_detect_interface_quirks(udev); 219680da2e0dSLaurent Pinchart 219780da2e0dSLaurent Pinchart return 0; 2198d9d16e8aSInaky Perez-Gonzalez } 2199d9d16e8aSInaky Perez-Gonzalez 2200d35e70d5SMatthew Garrett static void set_usb_port_removable(struct usb_device *udev) 2201d35e70d5SMatthew Garrett { 2202d35e70d5SMatthew Garrett struct usb_device *hdev = udev->parent; 2203d35e70d5SMatthew Garrett struct usb_hub *hub; 2204d35e70d5SMatthew Garrett u8 port = udev->portnum; 2205d35e70d5SMatthew Garrett u16 wHubCharacteristics; 2206d35e70d5SMatthew Garrett bool removable = true; 2207d35e70d5SMatthew Garrett 2208d35e70d5SMatthew Garrett if (!hdev) 2209d35e70d5SMatthew Garrett return; 2210d35e70d5SMatthew Garrett 2211d35e70d5SMatthew Garrett hub = hdev_to_hub(udev->parent); 2212d35e70d5SMatthew Garrett 2213d35e70d5SMatthew Garrett wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 2214d35e70d5SMatthew Garrett 2215d35e70d5SMatthew Garrett if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) 2216d35e70d5SMatthew Garrett return; 2217d35e70d5SMatthew Garrett 2218d35e70d5SMatthew Garrett if (hub_is_superspeed(hdev)) { 2219ca3c1539SLan Tianyu if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) 2220ca3c1539SLan Tianyu & (1 << port)) 2221d35e70d5SMatthew Garrett removable = false; 2222d35e70d5SMatthew Garrett } else { 2223d35e70d5SMatthew Garrett if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) 2224d35e70d5SMatthew Garrett removable = false; 2225d35e70d5SMatthew Garrett } 2226d35e70d5SMatthew Garrett 2227d35e70d5SMatthew Garrett if (removable) 2228d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 2229d35e70d5SMatthew Garrett else 2230d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 2231d35e70d5SMatthew Garrett } 2232d9d16e8aSInaky Perez-Gonzalez 2233d9d16e8aSInaky Perez-Gonzalez /** 2234d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 2235d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2236d9d16e8aSInaky Perez-Gonzalez * 22378d8558d1SAlan Stern * This is called with devices which have been detected but not fully 22388d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 2239d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 2240d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 2241d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 2242d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 2243d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 2244d9d16e8aSInaky Perez-Gonzalez * 2245d9d16e8aSInaky Perez-Gonzalez * It will return if the device is configured properly or not. Zero if 2246d9d16e8aSInaky Perez-Gonzalez * the interface was registered with the driver core; else a negative 2247d9d16e8aSInaky Perez-Gonzalez * errno value. 2248d9d16e8aSInaky Perez-Gonzalez * 2249d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 2250d9d16e8aSInaky Perez-Gonzalez * 2251d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 2252d9d16e8aSInaky Perez-Gonzalez */ 2253d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 2254d9d16e8aSInaky Perez-Gonzalez { 2255d9d16e8aSInaky Perez-Gonzalez int err; 2256d9d16e8aSInaky Perez-Gonzalez 225716985408SDan Streetman if (udev->parent) { 225816985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 225916985408SDan Streetman * device (un)configuration controls wakeup capable 226016985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 226116985408SDan Streetman */ 226216985408SDan Streetman device_init_wakeup(&udev->dev, 0); 226316985408SDan Streetman } 226416985408SDan Streetman 22659bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 22669bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 2267c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 2268fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 22699bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 22709bbdf1e0SAlan Stern 2271c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 2272c08512c7SAlan Stern * allowed for hubs during binding. 2273c08512c7SAlan Stern */ 2274c08512c7SAlan Stern usb_disable_autosuspend(udev); 2275c08512c7SAlan Stern 22768d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 2277d9d16e8aSInaky Perez-Gonzalez if (err < 0) 2278d9d16e8aSInaky Perez-Gonzalez goto fail; 2279c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 2280c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 2281c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 22829f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 22839f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 22849f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 22859f8b17e6SKay Sievers 22866cd13201SAlan Stern /* Tell the world! */ 22876cd13201SAlan Stern announce_device(udev); 2288195af2ccSAlan Stern 2289b04b3156STheodore Ts'o if (udev->serial) 2290b04b3156STheodore Ts'o add_device_randomness(udev->serial, strlen(udev->serial)); 2291b04b3156STheodore Ts'o if (udev->product) 2292b04b3156STheodore Ts'o add_device_randomness(udev->product, strlen(udev->product)); 2293b04b3156STheodore Ts'o if (udev->manufacturer) 2294b04b3156STheodore Ts'o add_device_randomness(udev->manufacturer, 2295b04b3156STheodore Ts'o strlen(udev->manufacturer)); 2296b04b3156STheodore Ts'o 2297927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 2298d35e70d5SMatthew Garrett 2299d35e70d5SMatthew Garrett /* 2300d35e70d5SMatthew Garrett * check whether the hub marks this port as non-removable. Do it 2301d35e70d5SMatthew Garrett * now so that platform-specific data can override it in 2302d35e70d5SMatthew Garrett * device_add() 2303d35e70d5SMatthew Garrett */ 2304d35e70d5SMatthew Garrett if (udev->parent) 2305d35e70d5SMatthew Garrett set_usb_port_removable(udev); 2306d35e70d5SMatthew Garrett 2307782da727SAlan Stern /* Register the device. The device driver is responsible 23083b23dd6fSAlan Stern * for configuring the device and invoking the add-device 23093b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2310782da727SAlan Stern */ 23111da177e4SLinus Torvalds err = device_add(&udev->dev); 23121da177e4SLinus Torvalds if (err) { 23131da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 23141da177e4SLinus Torvalds goto fail; 23151da177e4SLinus Torvalds } 23169ad3d6ccSAlan Stern 23173b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 2318c08512c7SAlan Stern usb_mark_last_busy(udev); 2319c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 2320c066475eSGreg Kroah-Hartman return err; 23211da177e4SLinus Torvalds 23221da177e4SLinus Torvalds fail: 23231da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 23249bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 23259bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 2326d9d16e8aSInaky Perez-Gonzalez return err; 23271da177e4SLinus Torvalds } 23281da177e4SLinus Torvalds 232993993a0aSInaky Perez-Gonzalez 233093993a0aSInaky Perez-Gonzalez /** 2331fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 2332fd39c86bSRandy Dunlap * @usb_dev: USB device 2333fd39c86bSRandy Dunlap * 2334fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 2335fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 233693993a0aSInaky Perez-Gonzalez * 233793993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 233893993a0aSInaky Perez-Gonzalez * defer its call. 233993993a0aSInaky Perez-Gonzalez */ 234093993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 234193993a0aSInaky Perez-Gonzalez { 234293993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 234393993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 234493993a0aSInaky Perez-Gonzalez goto out_unauthorized; 2345da307123SAlan Stern 234693993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 234793993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 2348da307123SAlan Stern 2349da307123SAlan Stern kfree(usb_dev->product); 235093993a0aSInaky Perez-Gonzalez usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2351da307123SAlan Stern kfree(usb_dev->manufacturer); 235293993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2353da307123SAlan Stern kfree(usb_dev->serial); 235493993a0aSInaky Perez-Gonzalez usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 2355da307123SAlan Stern 2356da307123SAlan Stern usb_destroy_configuration(usb_dev); 235793993a0aSInaky Perez-Gonzalez usb_dev->descriptor.bNumConfigurations = 0; 2358da307123SAlan Stern 235993993a0aSInaky Perez-Gonzalez out_unauthorized: 236093993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 236193993a0aSInaky Perez-Gonzalez return 0; 236293993a0aSInaky Perez-Gonzalez } 236393993a0aSInaky Perez-Gonzalez 236493993a0aSInaky Perez-Gonzalez 236593993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 236693993a0aSInaky Perez-Gonzalez { 236793993a0aSInaky Perez-Gonzalez int result = 0, c; 2368da307123SAlan Stern 236993993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 237093993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 237193993a0aSInaky Perez-Gonzalez goto out_authorized; 2372da307123SAlan Stern 237393993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 237493993a0aSInaky Perez-Gonzalez if (result < 0) { 237593993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 237693993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 237793993a0aSInaky Perez-Gonzalez goto error_autoresume; 237893993a0aSInaky Perez-Gonzalez } 237993993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 238093993a0aSInaky Perez-Gonzalez if (result < 0) { 238193993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 238293993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 238393993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 238493993a0aSInaky Perez-Gonzalez } 2385da307123SAlan Stern 2386da307123SAlan Stern kfree(usb_dev->product); 2387da307123SAlan Stern usb_dev->product = NULL; 2388da307123SAlan Stern kfree(usb_dev->manufacturer); 2389da307123SAlan Stern usb_dev->manufacturer = NULL; 2390da307123SAlan Stern kfree(usb_dev->serial); 2391da307123SAlan Stern usb_dev->serial = NULL; 2392da307123SAlan Stern 239393993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 23948d8558d1SAlan Stern result = usb_enumerate_device(usb_dev); 239593993a0aSInaky Perez-Gonzalez if (result < 0) 23968d8558d1SAlan Stern goto error_enumerate; 239793993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 239893993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 239993993a0aSInaky Perez-Gonzalez */ 2400b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 240193993a0aSInaky Perez-Gonzalez if (c >= 0) { 240293993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 240393993a0aSInaky Perez-Gonzalez if (result) { 240493993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 240593993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 240693993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 240793993a0aSInaky Perez-Gonzalez * set other configurations. */ 240893993a0aSInaky Perez-Gonzalez } 240993993a0aSInaky Perez-Gonzalez } 241093993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2411da307123SAlan Stern 24128d8558d1SAlan Stern error_enumerate: 241393993a0aSInaky Perez-Gonzalez error_device_descriptor: 2414da307123SAlan Stern usb_autosuspend_device(usb_dev); 241593993a0aSInaky Perez-Gonzalez error_autoresume: 241693993a0aSInaky Perez-Gonzalez out_authorized: 241793993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); // complements locktree 241893993a0aSInaky Perez-Gonzalez return result; 241993993a0aSInaky Perez-Gonzalez } 242093993a0aSInaky Perez-Gonzalez 242193993a0aSInaky Perez-Gonzalez 24220165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 24230165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 24240165de09SInaky Perez-Gonzalez { 24250165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 24260165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 24270165de09SInaky Perez-Gonzalez return 0; 24280165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 24290165de09SInaky Perez-Gonzalez return hcd->wireless; 24300165de09SInaky Perez-Gonzalez } 24310165de09SInaky Perez-Gonzalez 24320165de09SInaky Perez-Gonzalez 24331da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 24341da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 24351da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 24361da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 243790ab5ee9SRusty Russell #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) 24381da177e4SLinus Torvalds 24391da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 24401da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 244175d7cf72SAndiry Xu #define HUB_BH_RESET_TIME 50 24421da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 24431da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 24441da177e4SLinus Torvalds 244510d674a8SSarah Sharp static int hub_port_reset(struct usb_hub *hub, int port1, 244610d674a8SSarah Sharp struct usb_device *udev, unsigned int delay, bool warm); 244710d674a8SSarah Sharp 24488bea2bd3SStanislaw Ledwon /* Is a USB 3.0 port in the Inactive or Complinance Mode state? 24498bea2bd3SStanislaw Ledwon * Port worm reset is required to recover 24508bea2bd3SStanislaw Ledwon */ 24518bea2bd3SStanislaw Ledwon static bool hub_port_warm_reset_required(struct usb_hub *hub, u16 portstatus) 245210d674a8SSarah Sharp { 245310d674a8SSarah Sharp return hub_is_superspeed(hub->hdev) && 24548bea2bd3SStanislaw Ledwon (((portstatus & USB_PORT_STAT_LINK_STATE) == 24558bea2bd3SStanislaw Ledwon USB_SS_PORT_LS_SS_INACTIVE) || 24568bea2bd3SStanislaw Ledwon ((portstatus & USB_PORT_STAT_LINK_STATE) == 24578bea2bd3SStanislaw Ledwon USB_SS_PORT_LS_COMP_MOD)) ; 245810d674a8SSarah Sharp } 245910d674a8SSarah Sharp 24601da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 246175d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 24621da177e4SLinus Torvalds { 24631da177e4SLinus Torvalds int delay_time, ret; 24641da177e4SLinus Torvalds u16 portstatus; 24651da177e4SLinus Torvalds u16 portchange; 24661da177e4SLinus Torvalds 24671da177e4SLinus Torvalds for (delay_time = 0; 24681da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 24691da177e4SLinus Torvalds delay_time += delay) { 24701da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 24711da177e4SLinus Torvalds msleep(delay); 24721da177e4SLinus Torvalds 24731da177e4SLinus Torvalds /* read and decode port status */ 24741da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 24751da177e4SLinus Torvalds if (ret < 0) 24761da177e4SLinus Torvalds return ret; 24771da177e4SLinus Torvalds 247875d7cf72SAndiry Xu /* 247975d7cf72SAndiry Xu * Some buggy devices require a warm reset to be issued even 248075d7cf72SAndiry Xu * when the port appears not to be connected. 248175d7cf72SAndiry Xu */ 248275d7cf72SAndiry Xu if (!warm) { 248310d674a8SSarah Sharp /* 248410d674a8SSarah Sharp * Some buggy devices can cause an NEC host controller 248510d674a8SSarah Sharp * to transition to the "Error" state after a hot port 248610d674a8SSarah Sharp * reset. This will show up as the port state in 248710d674a8SSarah Sharp * "Inactive", and the port may also report a 248810d674a8SSarah Sharp * disconnect. Forcing a warm port reset seems to make 248910d674a8SSarah Sharp * the device work. 249010d674a8SSarah Sharp * 249110d674a8SSarah Sharp * See https://bugzilla.kernel.org/show_bug.cgi?id=41752 249210d674a8SSarah Sharp */ 24938bea2bd3SStanislaw Ledwon if (hub_port_warm_reset_required(hub, portstatus)) { 249410d674a8SSarah Sharp int ret; 249510d674a8SSarah Sharp 249610d674a8SSarah Sharp if ((portchange & USB_PORT_STAT_C_CONNECTION)) 249710d674a8SSarah Sharp clear_port_feature(hub->hdev, port1, 249810d674a8SSarah Sharp USB_PORT_FEAT_C_CONNECTION); 249910d674a8SSarah Sharp if (portchange & USB_PORT_STAT_C_LINK_STATE) 250010d674a8SSarah Sharp clear_port_feature(hub->hdev, port1, 250110d674a8SSarah Sharp USB_PORT_FEAT_C_PORT_LINK_STATE); 250210d674a8SSarah Sharp if (portchange & USB_PORT_STAT_C_RESET) 250310d674a8SSarah Sharp clear_port_feature(hub->hdev, port1, 250410d674a8SSarah Sharp USB_PORT_FEAT_C_RESET); 250510d674a8SSarah Sharp dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n", 250610d674a8SSarah Sharp port1); 250710d674a8SSarah Sharp ret = hub_port_reset(hub, port1, 250810d674a8SSarah Sharp udev, HUB_BH_RESET_TIME, 250910d674a8SSarah Sharp true); 251010d674a8SSarah Sharp if ((portchange & USB_PORT_STAT_C_CONNECTION)) 251110d674a8SSarah Sharp clear_port_feature(hub->hdev, port1, 251210d674a8SSarah Sharp USB_PORT_FEAT_C_CONNECTION); 251310d674a8SSarah Sharp return ret; 251410d674a8SSarah Sharp } 25151da177e4SLinus Torvalds /* Device went away? */ 25161da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 25171da177e4SLinus Torvalds return -ENOTCONN; 25181da177e4SLinus Torvalds 2519dd4dd19eSAlan Stern /* bomb out completely if the connection bounced */ 25201da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 2521dd4dd19eSAlan Stern return -ENOTCONN; 25221da177e4SLinus Torvalds 252375d7cf72SAndiry Xu /* if we`ve finished resetting, then break out of 252475d7cf72SAndiry Xu * the loop 252575d7cf72SAndiry Xu */ 25261da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 25271da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 25280165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2529551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 2530131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2531809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 25320165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 25331da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 25341da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 25351da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 25361da177e4SLinus Torvalds else 25371da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 25381da177e4SLinus Torvalds return 0; 25391da177e4SLinus Torvalds } 254075d7cf72SAndiry Xu } else { 254175d7cf72SAndiry Xu if (portchange & USB_PORT_STAT_C_BH_RESET) 254275d7cf72SAndiry Xu return 0; 254375d7cf72SAndiry Xu } 25441da177e4SLinus Torvalds 25451da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 25461da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 25471da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 25481da177e4SLinus Torvalds 25491da177e4SLinus Torvalds dev_dbg (hub->intfdev, 255075d7cf72SAndiry Xu "port %d not %sreset yet, waiting %dms\n", 255175d7cf72SAndiry Xu port1, warm ? "warm " : "", delay); 25521da177e4SLinus Torvalds } 25531da177e4SLinus Torvalds 25541da177e4SLinus Torvalds return -EBUSY; 25551da177e4SLinus Torvalds } 25561da177e4SLinus Torvalds 255775d7cf72SAndiry Xu static void hub_port_finish_reset(struct usb_hub *hub, int port1, 255875d7cf72SAndiry Xu struct usb_device *udev, int *status, bool warm) 25591da177e4SLinus Torvalds { 256075d7cf72SAndiry Xu switch (*status) { 25611da177e4SLinus Torvalds case 0: 256275d7cf72SAndiry Xu if (!warm) { 256375d7cf72SAndiry Xu struct usb_hcd *hcd; 2564b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 2565b789696aSDavid Brownell msleep(10 + 40); 25663b29b68bSAlan Stern update_devnum(udev, 0); 256775d7cf72SAndiry Xu hcd = bus_to_hcd(udev->bus); 2568a5f0efabSSarah Sharp if (hcd->driver->reset_device) { 256975d7cf72SAndiry Xu *status = hcd->driver->reset_device(hcd, udev); 257075d7cf72SAndiry Xu if (*status < 0) { 2571a5f0efabSSarah Sharp dev_err(&udev->dev, "Cannot reset " 2572a5f0efabSSarah Sharp "HCD device state\n"); 2573a5f0efabSSarah Sharp break; 2574a5f0efabSSarah Sharp } 2575a5f0efabSSarah Sharp } 257675d7cf72SAndiry Xu } 25771da177e4SLinus Torvalds /* FALL THROUGH */ 25781da177e4SLinus Torvalds case -ENOTCONN: 25791da177e4SLinus Torvalds case -ENODEV: 25801da177e4SLinus Torvalds clear_port_feature(hub->hdev, 25811da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 25821da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 258375d7cf72SAndiry Xu if (warm) { 258475d7cf72SAndiry Xu clear_port_feature(hub->hdev, port1, 258575d7cf72SAndiry Xu USB_PORT_FEAT_C_BH_PORT_RESET); 258675d7cf72SAndiry Xu clear_port_feature(hub->hdev, port1, 258775d7cf72SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 258875d7cf72SAndiry Xu } else { 258975d7cf72SAndiry Xu usb_set_device_state(udev, *status 25901da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 25911da177e4SLinus Torvalds : USB_STATE_DEFAULT); 259275d7cf72SAndiry Xu } 259375d7cf72SAndiry Xu break; 259475d7cf72SAndiry Xu } 259575d7cf72SAndiry Xu } 259675d7cf72SAndiry Xu 259775d7cf72SAndiry Xu /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ 259875d7cf72SAndiry Xu static int hub_port_reset(struct usb_hub *hub, int port1, 259975d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 260075d7cf72SAndiry Xu { 260175d7cf72SAndiry Xu int i, status; 260275d7cf72SAndiry Xu 260375d7cf72SAndiry Xu if (!warm) { 260475d7cf72SAndiry Xu /* Block EHCI CF initialization during the port reset. 260575d7cf72SAndiry Xu * Some companion controllers don't like it when they mix. 260675d7cf72SAndiry Xu */ 260775d7cf72SAndiry Xu down_read(&ehci_cf_port_reset_rwsem); 260875d7cf72SAndiry Xu } else { 260975d7cf72SAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 261075d7cf72SAndiry Xu dev_err(hub->intfdev, "only USB3 hub support " 261175d7cf72SAndiry Xu "warm reset\n"); 261275d7cf72SAndiry Xu return -EINVAL; 261375d7cf72SAndiry Xu } 261475d7cf72SAndiry Xu } 261575d7cf72SAndiry Xu 261675d7cf72SAndiry Xu /* Reset the port */ 261775d7cf72SAndiry Xu for (i = 0; i < PORT_RESET_TRIES; i++) { 261875d7cf72SAndiry Xu status = set_port_feature(hub->hdev, port1, (warm ? 261975d7cf72SAndiry Xu USB_PORT_FEAT_BH_PORT_RESET : 262075d7cf72SAndiry Xu USB_PORT_FEAT_RESET)); 262175d7cf72SAndiry Xu if (status) { 262275d7cf72SAndiry Xu dev_err(hub->intfdev, 262375d7cf72SAndiry Xu "cannot %sreset port %d (err = %d)\n", 262475d7cf72SAndiry Xu warm ? "warm " : "", port1, status); 262575d7cf72SAndiry Xu } else { 262675d7cf72SAndiry Xu status = hub_port_wait_reset(hub, port1, udev, delay, 262775d7cf72SAndiry Xu warm); 262875d7cf72SAndiry Xu if (status && status != -ENOTCONN) 262975d7cf72SAndiry Xu dev_dbg(hub->intfdev, 263075d7cf72SAndiry Xu "port_wait_reset: err = %d\n", 263175d7cf72SAndiry Xu status); 263275d7cf72SAndiry Xu } 263375d7cf72SAndiry Xu 263475d7cf72SAndiry Xu /* return on disconnect or reset */ 263575d7cf72SAndiry Xu if (status == 0 || status == -ENOTCONN || status == -ENODEV) { 263675d7cf72SAndiry Xu hub_port_finish_reset(hub, port1, udev, &status, warm); 263732fe0198SAlan Stern goto done; 26381da177e4SLinus Torvalds } 26391da177e4SLinus Torvalds 26401da177e4SLinus Torvalds dev_dbg (hub->intfdev, 264175d7cf72SAndiry Xu "port %d not enabled, trying %sreset again...\n", 264275d7cf72SAndiry Xu port1, warm ? "warm " : ""); 26431da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 26441da177e4SLinus Torvalds } 26451da177e4SLinus Torvalds 26461da177e4SLinus Torvalds dev_err (hub->intfdev, 26471da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 26481da177e4SLinus Torvalds port1); 26491da177e4SLinus Torvalds 265032fe0198SAlan Stern done: 265175d7cf72SAndiry Xu if (!warm) 265232fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 265375d7cf72SAndiry Xu 26541da177e4SLinus Torvalds return status; 26551da177e4SLinus Torvalds } 26561da177e4SLinus Torvalds 26570ed9a57eSAndiry Xu /* Check if a port is power on */ 26580ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 26590ed9a57eSAndiry Xu { 26600ed9a57eSAndiry Xu int ret = 0; 26610ed9a57eSAndiry Xu 26620ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 26630ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 26640ed9a57eSAndiry Xu ret = 1; 26650ed9a57eSAndiry Xu } else { 26660ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 26670ed9a57eSAndiry Xu ret = 1; 26680ed9a57eSAndiry Xu } 26690ed9a57eSAndiry Xu 26700ed9a57eSAndiry Xu return ret; 26710ed9a57eSAndiry Xu } 26720ed9a57eSAndiry Xu 2673d388dab7SAlan Stern #ifdef CONFIG_PM 26741da177e4SLinus Torvalds 26750ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 26760ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 26770ed9a57eSAndiry Xu { 26780ed9a57eSAndiry Xu int ret = 0; 26790ed9a57eSAndiry Xu 26800ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 26810ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 26820ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 26830ed9a57eSAndiry Xu ret = 1; 26840ed9a57eSAndiry Xu } else { 26850ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 26860ed9a57eSAndiry Xu ret = 1; 26870ed9a57eSAndiry Xu } 26880ed9a57eSAndiry Xu 26890ed9a57eSAndiry Xu return ret; 26900ed9a57eSAndiry Xu } 2691b01b03f3SAlan Stern 2692b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2693b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2694b01b03f3SAlan Stern */ 2695b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2696b01b03f3SAlan Stern struct usb_hub *hub, int port1, 2697b01b03f3SAlan Stern int status, unsigned portchange, unsigned portstatus) 2698b01b03f3SAlan Stern { 2699b01b03f3SAlan Stern /* Is the device still present? */ 27000ed9a57eSAndiry Xu if (status || port_is_suspended(hub, portstatus) || 27010ed9a57eSAndiry Xu !port_is_power_on(hub, portstatus) || 27020ed9a57eSAndiry Xu !(portstatus & USB_PORT_STAT_CONNECTION)) { 2703b01b03f3SAlan Stern if (status >= 0) 2704b01b03f3SAlan Stern status = -ENODEV; 2705b01b03f3SAlan Stern } 2706b01b03f3SAlan Stern 270786c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 270886c57edfSAlan Stern * so try a reset-resume instead. 270986c57edfSAlan Stern */ 271086c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 271186c57edfSAlan Stern if (udev->persist_enabled) 271286c57edfSAlan Stern udev->reset_resume = 1; 271386c57edfSAlan Stern else 2714b01b03f3SAlan Stern status = -ENODEV; 271586c57edfSAlan Stern } 2716b01b03f3SAlan Stern 2717b01b03f3SAlan Stern if (status) { 2718b01b03f3SAlan Stern dev_dbg(hub->intfdev, 2719b01b03f3SAlan Stern "port %d status %04x.%04x after resume, %d\n", 2720b01b03f3SAlan Stern port1, portchange, portstatus, status); 2721b01b03f3SAlan Stern } else if (udev->reset_resume) { 2722b01b03f3SAlan Stern 2723b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2724b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2725b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2726b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2727b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2728b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2729b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2730b01b03f3SAlan Stern } 2731b01b03f3SAlan Stern 2732b01b03f3SAlan Stern return status; 2733b01b03f3SAlan Stern } 2734b01b03f3SAlan Stern 2735f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 2736f74631e3SSarah Sharp { 2737f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2738f74631e3SSarah Sharp 2739f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2740f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2741f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2742f74631e3SSarah Sharp return 0; 2743f74631e3SSarah Sharp 2744f74631e3SSarah Sharp /* Clear Feature LTM Enable can only be sent if the device is 2745f74631e3SSarah Sharp * configured. 2746f74631e3SSarah Sharp */ 2747f74631e3SSarah Sharp if (!udev->actconfig) 2748f74631e3SSarah Sharp return 0; 2749f74631e3SSarah Sharp 2750f74631e3SSarah Sharp return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2751f74631e3SSarah Sharp USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2752f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2753f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2754f74631e3SSarah Sharp } 2755f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 2756f74631e3SSarah Sharp 2757f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) 2758f74631e3SSarah Sharp { 2759f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2760f74631e3SSarah Sharp 2761f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2762f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2763f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2764f74631e3SSarah Sharp return; 2765f74631e3SSarah Sharp 2766f74631e3SSarah Sharp /* Set Feature LTM Enable can only be sent if the device is 2767f74631e3SSarah Sharp * configured. 2768f74631e3SSarah Sharp */ 2769f74631e3SSarah Sharp if (!udev->actconfig) 2770f74631e3SSarah Sharp return; 2771f74631e3SSarah Sharp 2772f74631e3SSarah Sharp usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2773f74631e3SSarah Sharp USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2774f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2775f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2776f74631e3SSarah Sharp } 2777f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 2778f74631e3SSarah Sharp 27791da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 27801da177e4SLinus Torvalds 27811da177e4SLinus Torvalds /* 2782140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 2783624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 27845edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 27851da177e4SLinus Torvalds * 27861da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 27871da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 27881da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 2789140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 27901da177e4SLinus Torvalds * to disconnect devices while they are suspended. 27911da177e4SLinus Torvalds * 2792390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 2793390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 2794390a8c34SDavid Brownell * 2795624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 2796624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 2797624d6c07SAlan Stern * All devices below the suspended port are also suspended. 2798624d6c07SAlan Stern * 2799624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 2800624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 2801624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 2802624d6c07SAlan Stern * some cases, this wakes the USB host. 2803624d6c07SAlan Stern * 28041da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 28051da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 28061da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 28071da177e4SLinus Torvalds * 28084956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 28094956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 28104956eccdSAlan Stern * State transitions include: 28114956eccdSAlan Stern * 28124956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 28134956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 28144956eccdSAlan Stern * 28154956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 28164956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 28174956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 28184956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 28194956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 28204956eccdSAlan Stern * 28214956eccdSAlan Stern * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 28224956eccdSAlan Stern * the root hub for their bus goes into global suspend ... so we don't 28234956eccdSAlan Stern * (falsely) update the device power state to say it suspended. 28244956eccdSAlan Stern * 28251da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 28261da177e4SLinus Torvalds */ 282765bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 28281da177e4SLinus Torvalds { 2829624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2830624d6c07SAlan Stern int port1 = udev->portnum; 2831624d6c07SAlan Stern int status; 28324956eccdSAlan Stern 2833624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 2834624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 2835624d6c07SAlan Stern * 2836624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 2837624d6c07SAlan Stern * we don't explicitly enable it here. 2838624d6c07SAlan Stern */ 2839624d6c07SAlan Stern if (udev->do_remote_wakeup) { 2840623bef9eSSarah Sharp if (!hub_is_superspeed(hub->hdev)) { 2841624d6c07SAlan Stern status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2842624d6c07SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2843624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2844624d6c07SAlan Stern NULL, 0, 2845624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 2846623bef9eSSarah Sharp } else { 2847623bef9eSSarah Sharp /* Assume there's only one function on the USB 3.0 2848623bef9eSSarah Sharp * device and enable remote wake for the first 2849623bef9eSSarah Sharp * interface. FIXME if the interface association 2850623bef9eSSarah Sharp * descriptor shows there's more than one function. 2851623bef9eSSarah Sharp */ 2852623bef9eSSarah Sharp status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2853623bef9eSSarah Sharp USB_REQ_SET_FEATURE, 2854623bef9eSSarah Sharp USB_RECIP_INTERFACE, 2855623bef9eSSarah Sharp USB_INTRF_FUNC_SUSPEND, 28563b9b6acdSSarah Sharp USB_INTRF_FUNC_SUSPEND_RW | 28573b9b6acdSSarah Sharp USB_INTRF_FUNC_SUSPEND_LP, 2858623bef9eSSarah Sharp NULL, 0, 2859623bef9eSSarah Sharp USB_CTRL_SET_TIMEOUT); 2860623bef9eSSarah Sharp } 28610c487206SOliver Neukum if (status) { 2862624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 2863624d6c07SAlan Stern status); 28640c487206SOliver Neukum /* bail if autosuspend is requested */ 28655b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 28660c487206SOliver Neukum return status; 28670c487206SOliver Neukum } 2868624d6c07SAlan Stern } 2869624d6c07SAlan Stern 287065580b43SAndiry Xu /* disable USB2 hardware LPM */ 287165580b43SAndiry Xu if (udev->usb2_hw_lpm_enabled == 1) 287265580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 0); 287365580b43SAndiry Xu 2874f74631e3SSarah Sharp if (usb_disable_ltm(udev)) { 2875f74631e3SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LTM before suspend\n.", 2876f74631e3SSarah Sharp __func__); 2877f74631e3SSarah Sharp return -ENOMEM; 2878f74631e3SSarah Sharp } 28798306095fSSarah Sharp if (usb_unlocked_disable_lpm(udev)) { 28808306095fSSarah Sharp dev_err(&udev->dev, "%s Failed to disable LPM before suspend\n.", 28818306095fSSarah Sharp __func__); 28828306095fSSarah Sharp return -ENOMEM; 28838306095fSSarah Sharp } 28848306095fSSarah Sharp 2885624d6c07SAlan Stern /* see 7.1.7.6 */ 2886a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 2887a7114230SAndiry Xu status = set_port_feature(hub->hdev, 2888a7114230SAndiry Xu port1 | (USB_SS_PORT_LS_U3 << 3), 2889a7114230SAndiry Xu USB_PORT_FEAT_LINK_STATE); 2890a8f08d86SAndiry Xu else 2891a8f08d86SAndiry Xu status = set_port_feature(hub->hdev, port1, 2892a8f08d86SAndiry Xu USB_PORT_FEAT_SUSPEND); 2893624d6c07SAlan Stern if (status) { 2894624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 2895624d6c07SAlan Stern port1, status); 2896624d6c07SAlan Stern /* paranoia: "should not happen" */ 28970c487206SOliver Neukum if (udev->do_remote_wakeup) 2898624d6c07SAlan Stern (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2899624d6c07SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2900624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2901624d6c07SAlan Stern NULL, 0, 2902624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 2903cbb33004SAlan Stern 2904c3e751e4SAndiry Xu /* Try to enable USB2 hardware LPM again */ 2905c3e751e4SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 2906c3e751e4SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 2907c3e751e4SAndiry Xu 2908f74631e3SSarah Sharp /* Try to enable USB3 LTM and LPM again */ 2909f74631e3SSarah Sharp usb_enable_ltm(udev); 29108306095fSSarah Sharp usb_unlocked_enable_lpm(udev); 29118306095fSSarah Sharp 2912cbb33004SAlan Stern /* System sleep transitions should never fail */ 29135b1b0b81SAlan Stern if (!PMSG_IS_AUTO(msg)) 2914cbb33004SAlan Stern status = 0; 2915624d6c07SAlan Stern } else { 2916624d6c07SAlan Stern /* device has up to 10 msec to fully suspend */ 291730b1a7a3SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", 291830b1a7a3SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : ""), 291930b1a7a3SAlan Stern udev->do_remote_wakeup); 2920624d6c07SAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 2921bfd1e910SAlan Stern udev->port_is_suspended = 1; 2922624d6c07SAlan Stern msleep(10); 2923624d6c07SAlan Stern } 2924c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 29254956eccdSAlan Stern return status; 29261da177e4SLinus Torvalds } 2927f3f3253dSDavid Brownell 29281da177e4SLinus Torvalds /* 2929390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 2930390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 293154515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 29321da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 29331da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 29341da177e4SLinus Torvalds * in the tree that's rooted at this device. 293554515fe5SAlan Stern * 293654515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 293754515fe5SAlan Stern * status check is done. 29381da177e4SLinus Torvalds */ 2939140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 29401da177e4SLinus Torvalds { 294154515fe5SAlan Stern int status = 0; 29421da177e4SLinus Torvalds u16 devstatus; 29431da177e4SLinus Torvalds 29441da177e4SLinus Torvalds /* caller owns the udev device lock */ 2945b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 2946b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 29471da177e4SLinus Torvalds 29481da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 29491da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 29501da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 29511da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 29521da177e4SLinus Torvalds */ 29531da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 29541da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 29551da177e4SLinus Torvalds : USB_STATE_ADDRESS); 29561da177e4SLinus Torvalds 295754515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 295854515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 295954515fe5SAlan Stern * operation is carried out here, after the port has been 296054515fe5SAlan Stern * resumed. 296154515fe5SAlan Stern */ 296254515fe5SAlan Stern if (udev->reset_resume) 296386c57edfSAlan Stern retry_reset_resume: 2964742120c6SMing Lei status = usb_reset_and_verify_device(udev); 296554515fe5SAlan Stern 29661da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 29671da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 29681da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 29691da177e4SLinus Torvalds */ 297054515fe5SAlan Stern if (status == 0) { 297146dede46SAlan Stern devstatus = 0; 29721da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 2973b40b7a90SAlan Stern if (status >= 0) 297446dede46SAlan Stern status = (status > 0 ? 0 : -ENODEV); 297586c57edfSAlan Stern 297686c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 297786c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 297886c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 297986c57edfSAlan Stern udev->reset_resume = 1; 298086c57edfSAlan Stern goto retry_reset_resume; 298186c57edfSAlan Stern } 298254515fe5SAlan Stern } 2983b40b7a90SAlan Stern 2984624d6c07SAlan Stern if (status) { 2985624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 29861da177e4SLinus Torvalds status); 2987624d6c07SAlan Stern } else if (udev->actconfig) { 29881da177e4SLinus Torvalds le16_to_cpus(&devstatus); 2989686314cfSAlan Stern if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { 29901da177e4SLinus Torvalds status = usb_control_msg(udev, 29911da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 29921da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 29931da177e4SLinus Torvalds USB_RECIP_DEVICE, 29941da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 29951da177e4SLinus Torvalds NULL, 0, 29961da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 2997a8e7c565SAlan Stern if (status) 2998b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 2999b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 3000b9cef6c3SWu Fengguang status); 30014bf0ba86SAlan Stern } 30021da177e4SLinus Torvalds status = 0; 30031da177e4SLinus Torvalds } 30041da177e4SLinus Torvalds return status; 30051da177e4SLinus Torvalds } 30061da177e4SLinus Torvalds 3007624d6c07SAlan Stern /* 3008624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 3009624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 3010624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 3011624d6c07SAlan Stern * 3012624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 3013624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 3014624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 3015624d6c07SAlan Stern * the host and the device is the same as it was when the device 3016624d6c07SAlan Stern * suspended. 3017624d6c07SAlan Stern * 3018feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 3019feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 302054515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 302154515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 302254515fe5SAlan Stern * 302354515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 302454515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 302554515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 302654515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 302754515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 302854515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 302954515fe5SAlan Stern * made to appear as if it had not disconnected. 303054515fe5SAlan Stern * 3031742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 3032feccc30dSAlan Stern * every effort to insure that the same device is present after the 303354515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 303454515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 303554515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 303654515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 303754515fe5SAlan Stern * new card is corrupted and the system crashes. 303854515fe5SAlan Stern * 3039624d6c07SAlan Stern * Returns 0 on success, else negative errno. 3040624d6c07SAlan Stern */ 304165bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 30421da177e4SLinus Torvalds { 3043624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 3044624d6c07SAlan Stern int port1 = udev->portnum; 30451da177e4SLinus Torvalds int status; 3046d25450c6SAlan Stern u16 portchange, portstatus; 3047d25450c6SAlan Stern 3048d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 3049d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 30500ed9a57eSAndiry Xu if (status == 0 && !port_is_suspended(hub, portstatus)) 3051d25450c6SAlan Stern goto SuspendCleared; 30521da177e4SLinus Torvalds 30531da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 30541da177e4SLinus Torvalds 3055d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 3056d5cbad4bSAlan Stern 30571da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 3058a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3059a7114230SAndiry Xu status = set_port_feature(hub->hdev, 3060a7114230SAndiry Xu port1 | (USB_SS_PORT_LS_U0 << 3), 3061a7114230SAndiry Xu USB_PORT_FEAT_LINK_STATE); 3062a7114230SAndiry Xu else 30631da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 30641da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 30651da177e4SLinus Torvalds if (status) { 3066624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 30671da177e4SLinus Torvalds port1, status); 30681da177e4SLinus Torvalds } else { 30691da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 3070645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 30715b1b0b81SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : "")); 30721da177e4SLinus Torvalds msleep(25); 30731da177e4SLinus Torvalds 30741da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 30751da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 30761da177e4SLinus Torvalds * sequence. 30771da177e4SLinus Torvalds */ 3078d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 307954515fe5SAlan Stern 30801da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 30811da177e4SLinus Torvalds msleep(10); 30821da177e4SLinus Torvalds } 3083b01b03f3SAlan Stern 3084b01b03f3SAlan Stern SuspendCleared: 3085b01b03f3SAlan Stern if (status == 0) { 3086bfd1e910SAlan Stern udev->port_is_suspended = 0; 3087a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 3088a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 3089a7114230SAndiry Xu clear_port_feature(hub->hdev, port1, 3090a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 3091a7114230SAndiry Xu } else { 3092b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 3093b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 3094b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 30951da177e4SLinus Torvalds } 3096a7114230SAndiry Xu } 30971da177e4SLinus Torvalds 3098d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 3099d5cbad4bSAlan Stern 3100b01b03f3SAlan Stern status = check_port_resume_type(udev, 3101b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 310254515fe5SAlan Stern if (status == 0) 310354515fe5SAlan Stern status = finish_port_resume(udev); 310454515fe5SAlan Stern if (status < 0) { 310554515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 310654515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 310765580b43SAndiry Xu } else { 310865580b43SAndiry Xu /* Try to enable USB2 hardware LPM */ 310965580b43SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 311065580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 31118306095fSSarah Sharp 3112f74631e3SSarah Sharp /* Try to enable USB3 LTM and LPM */ 3113f74631e3SSarah Sharp usb_enable_ltm(udev); 31148306095fSSarah Sharp usb_unlocked_enable_lpm(udev); 311554515fe5SAlan Stern } 311665580b43SAndiry Xu 31171da177e4SLinus Torvalds return status; 31181da177e4SLinus Torvalds } 31191da177e4SLinus Torvalds 31208808f00cSAlan Stern /* caller has locked udev */ 31210534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 31221da177e4SLinus Torvalds { 31231da177e4SLinus Torvalds int status = 0; 31241da177e4SLinus Torvalds 31251da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 3126645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 31279bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 31289bbdf1e0SAlan Stern if (status == 0) { 31299bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 31309bbdf1e0SAlan Stern usb_autosuspend_device(udev); 31319bbdf1e0SAlan Stern } 3132d25450c6SAlan Stern } 31331da177e4SLinus Torvalds return status; 31341da177e4SLinus Torvalds } 31351da177e4SLinus Torvalds 3136d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 3137d388dab7SAlan Stern 3138d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 3139d388dab7SAlan Stern 314065bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 3141d388dab7SAlan Stern { 3142d388dab7SAlan Stern return 0; 3143d388dab7SAlan Stern } 3144d388dab7SAlan Stern 3145b01b03f3SAlan Stern /* However we may need to do a reset-resume */ 3146b01b03f3SAlan Stern 314765bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 3148d388dab7SAlan Stern { 3149b01b03f3SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 3150b01b03f3SAlan Stern int port1 = udev->portnum; 3151b01b03f3SAlan Stern int status; 3152b01b03f3SAlan Stern u16 portchange, portstatus; 315354515fe5SAlan Stern 3154b01b03f3SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 3155b01b03f3SAlan Stern status = check_port_resume_type(udev, 3156b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 3157b01b03f3SAlan Stern 3158b01b03f3SAlan Stern if (status) { 3159b01b03f3SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 3160b01b03f3SAlan Stern hub_port_logical_disconnect(hub, port1); 3161b01b03f3SAlan Stern } else if (udev->reset_resume) { 316254515fe5SAlan Stern dev_dbg(&udev->dev, "reset-resume\n"); 3163742120c6SMing Lei status = usb_reset_and_verify_device(udev); 316454515fe5SAlan Stern } 316554515fe5SAlan Stern return status; 3166d388dab7SAlan Stern } 3167d388dab7SAlan Stern 3168d388dab7SAlan Stern #endif 3169d388dab7SAlan Stern 3170e6f30deaSMing Lei static int check_ports_changed(struct usb_hub *hub) 3171e6f30deaSMing Lei { 3172e6f30deaSMing Lei int port1; 3173e6f30deaSMing Lei 3174e6f30deaSMing Lei for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { 3175e6f30deaSMing Lei u16 portstatus, portchange; 3176e6f30deaSMing Lei int status; 3177e6f30deaSMing Lei 3178e6f30deaSMing Lei status = hub_port_status(hub, port1, &portstatus, &portchange); 3179e6f30deaSMing Lei if (!status && portchange) 3180e6f30deaSMing Lei return 1; 3181e6f30deaSMing Lei } 3182e6f30deaSMing Lei return 0; 3183e6f30deaSMing Lei } 3184e6f30deaSMing Lei 3185db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 31861da177e4SLinus Torvalds { 31871da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 31881da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 31891da177e4SLinus Torvalds unsigned port1; 31904296c70aSSarah Sharp int status; 31911da177e4SLinus Torvalds 3192cbb33004SAlan Stern /* Warn if children aren't already suspended */ 31931da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 31941da177e4SLinus Torvalds struct usb_device *udev; 31951da177e4SLinus Torvalds 3196ff823c79SLan Tianyu udev = hub->ports[port1 - 1]->child; 31976840d255SAlan Stern if (udev && udev->can_submit) { 3198cbb33004SAlan Stern dev_warn(&intf->dev, "port %d nyet suspended\n", port1); 31995b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 3200c9f89fa4SDavid Brownell return -EBUSY; 3201c9f89fa4SDavid Brownell } 32021da177e4SLinus Torvalds } 3203e6f30deaSMing Lei 3204e6f30deaSMing Lei if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { 3205e6f30deaSMing Lei /* check if there are changes pending on hub ports */ 3206e6f30deaSMing Lei if (check_ports_changed(hub)) { 3207e6f30deaSMing Lei if (PMSG_IS_AUTO(msg)) 3208e6f30deaSMing Lei return -EBUSY; 3209e6f30deaSMing Lei pm_wakeup_event(&hdev->dev, 2000); 3210e6f30deaSMing Lei } 3211e6f30deaSMing Lei } 3212e6f30deaSMing Lei 32134296c70aSSarah Sharp if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { 32144296c70aSSarah Sharp /* Enable hub to send remote wakeup for all ports. */ 32154296c70aSSarah Sharp for (port1 = 1; port1 <= hdev->maxchild; port1++) { 32164296c70aSSarah Sharp status = set_port_feature(hdev, 32174296c70aSSarah Sharp port1 | 32184296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_CONNECT | 32194296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | 32204296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, 32214296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_MASK); 32224296c70aSSarah Sharp } 32234296c70aSSarah Sharp } 32241da177e4SLinus Torvalds 3225441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 322640f122f3SAlan Stern 3227c9f89fa4SDavid Brownell /* stop khubd and related activity */ 32284330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 3229b6f6436dSAlan Stern return 0; 32301da177e4SLinus Torvalds } 32311da177e4SLinus Torvalds 32321da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 32331da177e4SLinus Torvalds { 32341da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 32351da177e4SLinus Torvalds 32365e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3237f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 32381da177e4SLinus Torvalds return 0; 32391da177e4SLinus Torvalds } 32401da177e4SLinus Torvalds 3241b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 3242f07600cfSAlan Stern { 3243b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 3244f07600cfSAlan Stern 32455e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3246f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 3247f07600cfSAlan Stern return 0; 3248f07600cfSAlan Stern } 3249f07600cfSAlan Stern 325054515fe5SAlan Stern /** 325154515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 325254515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 325354515fe5SAlan Stern * 325454515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 325554515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 3256feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 3257feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 3258feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 3259feccc30dSAlan Stern * the others will be disconnected. 326054515fe5SAlan Stern */ 326154515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 326254515fe5SAlan Stern { 326354515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 326454515fe5SAlan Stern rhdev->reset_resume = 1; 326554515fe5SAlan Stern } 326654515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 326754515fe5SAlan Stern 32681ea7e0e8SSarah Sharp static const char * const usb3_lpm_names[] = { 32691ea7e0e8SSarah Sharp "U0", 32701ea7e0e8SSarah Sharp "U1", 32711ea7e0e8SSarah Sharp "U2", 32721ea7e0e8SSarah Sharp "U3", 32731ea7e0e8SSarah Sharp }; 32741ea7e0e8SSarah Sharp 32751ea7e0e8SSarah Sharp /* 32761ea7e0e8SSarah Sharp * Send a Set SEL control transfer to the device, prior to enabling 32771ea7e0e8SSarah Sharp * device-initiated U1 or U2. This lets the device know the exit latencies from 32781ea7e0e8SSarah Sharp * the time the device initiates a U1 or U2 exit, to the time it will receive a 32791ea7e0e8SSarah Sharp * packet from the host. 32801ea7e0e8SSarah Sharp * 32811ea7e0e8SSarah Sharp * This function will fail if the SEL or PEL values for udev are greater than 32821ea7e0e8SSarah Sharp * the maximum allowed values for the link state to be enabled. 32831ea7e0e8SSarah Sharp */ 32841ea7e0e8SSarah Sharp static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) 32851ea7e0e8SSarah Sharp { 32861ea7e0e8SSarah Sharp struct usb_set_sel_req *sel_values; 32871ea7e0e8SSarah Sharp unsigned long long u1_sel; 32881ea7e0e8SSarah Sharp unsigned long long u1_pel; 32891ea7e0e8SSarah Sharp unsigned long long u2_sel; 32901ea7e0e8SSarah Sharp unsigned long long u2_pel; 32911ea7e0e8SSarah Sharp int ret; 32921ea7e0e8SSarah Sharp 32931ea7e0e8SSarah Sharp /* Convert SEL and PEL stored in ns to us */ 32941ea7e0e8SSarah Sharp u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); 32951ea7e0e8SSarah Sharp u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); 32961ea7e0e8SSarah Sharp u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); 32971ea7e0e8SSarah Sharp u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); 32981ea7e0e8SSarah Sharp 32991ea7e0e8SSarah Sharp /* 33001ea7e0e8SSarah Sharp * Make sure that the calculated SEL and PEL values for the link 33011ea7e0e8SSarah Sharp * state we're enabling aren't bigger than the max SEL/PEL 33021ea7e0e8SSarah Sharp * value that will fit in the SET SEL control transfer. 33031ea7e0e8SSarah Sharp * Otherwise the device would get an incorrect idea of the exit 33041ea7e0e8SSarah Sharp * latency for the link state, and could start a device-initiated 33051ea7e0e8SSarah Sharp * U1/U2 when the exit latencies are too high. 33061ea7e0e8SSarah Sharp */ 33071ea7e0e8SSarah Sharp if ((state == USB3_LPM_U1 && 33081ea7e0e8SSarah Sharp (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || 33091ea7e0e8SSarah Sharp u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || 33101ea7e0e8SSarah Sharp (state == USB3_LPM_U2 && 33111ea7e0e8SSarah Sharp (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || 33121ea7e0e8SSarah Sharp u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { 33131510a1a2SSarah Sharp dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", 33141ea7e0e8SSarah Sharp usb3_lpm_names[state], u1_sel, u1_pel); 33151ea7e0e8SSarah Sharp return -EINVAL; 33161ea7e0e8SSarah Sharp } 33171ea7e0e8SSarah Sharp 33181ea7e0e8SSarah Sharp /* 33191ea7e0e8SSarah Sharp * If we're enabling device-initiated LPM for one link state, 33201ea7e0e8SSarah Sharp * but the other link state has a too high SEL or PEL value, 33211ea7e0e8SSarah Sharp * just set those values to the max in the Set SEL request. 33221ea7e0e8SSarah Sharp */ 33231ea7e0e8SSarah Sharp if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) 33241ea7e0e8SSarah Sharp u1_sel = USB3_LPM_MAX_U1_SEL_PEL; 33251ea7e0e8SSarah Sharp 33261ea7e0e8SSarah Sharp if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) 33271ea7e0e8SSarah Sharp u1_pel = USB3_LPM_MAX_U1_SEL_PEL; 33281ea7e0e8SSarah Sharp 33291ea7e0e8SSarah Sharp if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) 33301ea7e0e8SSarah Sharp u2_sel = USB3_LPM_MAX_U2_SEL_PEL; 33311ea7e0e8SSarah Sharp 33321ea7e0e8SSarah Sharp if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) 33331ea7e0e8SSarah Sharp u2_pel = USB3_LPM_MAX_U2_SEL_PEL; 33341ea7e0e8SSarah Sharp 33351ea7e0e8SSarah Sharp /* 33361ea7e0e8SSarah Sharp * usb_enable_lpm() can be called as part of a failed device reset, 33371ea7e0e8SSarah Sharp * which may be initiated by an error path of a mass storage driver. 33381ea7e0e8SSarah Sharp * Therefore, use GFP_NOIO. 33391ea7e0e8SSarah Sharp */ 33401ea7e0e8SSarah Sharp sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); 33411ea7e0e8SSarah Sharp if (!sel_values) 33421ea7e0e8SSarah Sharp return -ENOMEM; 33431ea7e0e8SSarah Sharp 33441ea7e0e8SSarah Sharp sel_values->u1_sel = u1_sel; 33451ea7e0e8SSarah Sharp sel_values->u1_pel = u1_pel; 33461ea7e0e8SSarah Sharp sel_values->u2_sel = cpu_to_le16(u2_sel); 33471ea7e0e8SSarah Sharp sel_values->u2_pel = cpu_to_le16(u2_pel); 33481ea7e0e8SSarah Sharp 33491ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 33501ea7e0e8SSarah Sharp USB_REQ_SET_SEL, 33511ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 33521ea7e0e8SSarah Sharp 0, 0, 33531ea7e0e8SSarah Sharp sel_values, sizeof *(sel_values), 33541ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 33551ea7e0e8SSarah Sharp kfree(sel_values); 33561ea7e0e8SSarah Sharp return ret; 33571ea7e0e8SSarah Sharp } 33581ea7e0e8SSarah Sharp 33591ea7e0e8SSarah Sharp /* 33601ea7e0e8SSarah Sharp * Enable or disable device-initiated U1 or U2 transitions. 33611ea7e0e8SSarah Sharp */ 33621ea7e0e8SSarah Sharp static int usb_set_device_initiated_lpm(struct usb_device *udev, 33631ea7e0e8SSarah Sharp enum usb3_link_state state, bool enable) 33641ea7e0e8SSarah Sharp { 33651ea7e0e8SSarah Sharp int ret; 33661ea7e0e8SSarah Sharp int feature; 33671ea7e0e8SSarah Sharp 33681ea7e0e8SSarah Sharp switch (state) { 33691ea7e0e8SSarah Sharp case USB3_LPM_U1: 33701ea7e0e8SSarah Sharp feature = USB_DEVICE_U1_ENABLE; 33711ea7e0e8SSarah Sharp break; 33721ea7e0e8SSarah Sharp case USB3_LPM_U2: 33731ea7e0e8SSarah Sharp feature = USB_DEVICE_U2_ENABLE; 33741ea7e0e8SSarah Sharp break; 33751ea7e0e8SSarah Sharp default: 33761ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", 33771ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable"); 33781ea7e0e8SSarah Sharp return -EINVAL; 33791ea7e0e8SSarah Sharp } 33801ea7e0e8SSarah Sharp 33811ea7e0e8SSarah Sharp if (udev->state != USB_STATE_CONFIGURED) { 33821ea7e0e8SSarah Sharp dev_dbg(&udev->dev, "%s: Can't %s %s state " 33831ea7e0e8SSarah Sharp "for unconfigured device.\n", 33841ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable", 33851ea7e0e8SSarah Sharp usb3_lpm_names[state]); 33861ea7e0e8SSarah Sharp return 0; 33871ea7e0e8SSarah Sharp } 33881ea7e0e8SSarah Sharp 33891ea7e0e8SSarah Sharp if (enable) { 33901ea7e0e8SSarah Sharp /* 33911ea7e0e8SSarah Sharp * Now send the control transfer to enable device-initiated LPM 33921ea7e0e8SSarah Sharp * for either U1 or U2. 33931ea7e0e8SSarah Sharp */ 33941ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 33951ea7e0e8SSarah Sharp USB_REQ_SET_FEATURE, 33961ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 33971ea7e0e8SSarah Sharp feature, 33981ea7e0e8SSarah Sharp 0, NULL, 0, 33991ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 34001ea7e0e8SSarah Sharp } else { 34011ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 34021ea7e0e8SSarah Sharp USB_REQ_CLEAR_FEATURE, 34031ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 34041ea7e0e8SSarah Sharp feature, 34051ea7e0e8SSarah Sharp 0, NULL, 0, 34061ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 34071ea7e0e8SSarah Sharp } 34081ea7e0e8SSarah Sharp if (ret < 0) { 34091ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", 34101ea7e0e8SSarah Sharp enable ? "Enable" : "Disable", 34111ea7e0e8SSarah Sharp usb3_lpm_names[state]); 34121ea7e0e8SSarah Sharp return -EBUSY; 34131ea7e0e8SSarah Sharp } 34141ea7e0e8SSarah Sharp return 0; 34151ea7e0e8SSarah Sharp } 34161ea7e0e8SSarah Sharp 34171ea7e0e8SSarah Sharp static int usb_set_lpm_timeout(struct usb_device *udev, 34181ea7e0e8SSarah Sharp enum usb3_link_state state, int timeout) 34191ea7e0e8SSarah Sharp { 34201ea7e0e8SSarah Sharp int ret; 34211ea7e0e8SSarah Sharp int feature; 34221ea7e0e8SSarah Sharp 34231ea7e0e8SSarah Sharp switch (state) { 34241ea7e0e8SSarah Sharp case USB3_LPM_U1: 34251ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 34261ea7e0e8SSarah Sharp break; 34271ea7e0e8SSarah Sharp case USB3_LPM_U2: 34281ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 34291ea7e0e8SSarah Sharp break; 34301ea7e0e8SSarah Sharp default: 34311ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", 34321ea7e0e8SSarah Sharp __func__); 34331ea7e0e8SSarah Sharp return -EINVAL; 34341ea7e0e8SSarah Sharp } 34351ea7e0e8SSarah Sharp 34361ea7e0e8SSarah Sharp if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && 34371ea7e0e8SSarah Sharp timeout != USB3_LPM_DEVICE_INITIATED) { 34381ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " 34391ea7e0e8SSarah Sharp "which is a reserved value.\n", 34401ea7e0e8SSarah Sharp usb3_lpm_names[state], timeout); 34411ea7e0e8SSarah Sharp return -EINVAL; 34421ea7e0e8SSarah Sharp } 34431ea7e0e8SSarah Sharp 34441ea7e0e8SSarah Sharp ret = set_port_feature(udev->parent, 34451ea7e0e8SSarah Sharp USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, 34461ea7e0e8SSarah Sharp feature); 34471ea7e0e8SSarah Sharp if (ret < 0) { 34481ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," 34491ea7e0e8SSarah Sharp "error code %i\n", usb3_lpm_names[state], 34501ea7e0e8SSarah Sharp timeout, ret); 34511ea7e0e8SSarah Sharp return -EBUSY; 34521ea7e0e8SSarah Sharp } 34531ea7e0e8SSarah Sharp if (state == USB3_LPM_U1) 34541ea7e0e8SSarah Sharp udev->u1_params.timeout = timeout; 34551ea7e0e8SSarah Sharp else 34561ea7e0e8SSarah Sharp udev->u2_params.timeout = timeout; 34571ea7e0e8SSarah Sharp return 0; 34581ea7e0e8SSarah Sharp } 34591ea7e0e8SSarah Sharp 34601ea7e0e8SSarah Sharp /* 34611ea7e0e8SSarah Sharp * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated 34621ea7e0e8SSarah Sharp * U1/U2 entry. 34631ea7e0e8SSarah Sharp * 34641ea7e0e8SSarah Sharp * We will attempt to enable U1 or U2, but there are no guarantees that the 34651ea7e0e8SSarah Sharp * control transfers to set the hub timeout or enable device-initiated U1/U2 34661ea7e0e8SSarah Sharp * will be successful. 34671ea7e0e8SSarah Sharp * 34681ea7e0e8SSarah Sharp * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI 34691ea7e0e8SSarah Sharp * driver know about it. If that call fails, it should be harmless, and just 34701ea7e0e8SSarah Sharp * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. 34711ea7e0e8SSarah Sharp */ 34721ea7e0e8SSarah Sharp static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 34731ea7e0e8SSarah Sharp enum usb3_link_state state) 34741ea7e0e8SSarah Sharp { 347565a95b75SSarah Sharp int timeout, ret; 3476ae8963adSSarah Sharp __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; 3477ae8963adSSarah Sharp __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; 3478ae8963adSSarah Sharp 3479ae8963adSSarah Sharp /* If the device says it doesn't have *any* exit latency to come out of 3480ae8963adSSarah Sharp * U1 or U2, it's probably lying. Assume it doesn't implement that link 3481ae8963adSSarah Sharp * state. 3482ae8963adSSarah Sharp */ 3483ae8963adSSarah Sharp if ((state == USB3_LPM_U1 && u1_mel == 0) || 3484ae8963adSSarah Sharp (state == USB3_LPM_U2 && u2_mel == 0)) 3485ae8963adSSarah Sharp return; 34861ea7e0e8SSarah Sharp 348765a95b75SSarah Sharp /* 348865a95b75SSarah Sharp * First, let the device know about the exit latencies 348965a95b75SSarah Sharp * associated with the link state we're about to enable. 349065a95b75SSarah Sharp */ 349165a95b75SSarah Sharp ret = usb_req_set_sel(udev, state); 349265a95b75SSarah Sharp if (ret < 0) { 349365a95b75SSarah Sharp dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", 349465a95b75SSarah Sharp usb3_lpm_names[state]); 349565a95b75SSarah Sharp return; 349665a95b75SSarah Sharp } 349765a95b75SSarah Sharp 34981ea7e0e8SSarah Sharp /* We allow the host controller to set the U1/U2 timeout internally 34991ea7e0e8SSarah Sharp * first, so that it can change its schedule to account for the 35001ea7e0e8SSarah Sharp * additional latency to send data to a device in a lower power 35011ea7e0e8SSarah Sharp * link state. 35021ea7e0e8SSarah Sharp */ 35031ea7e0e8SSarah Sharp timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); 35041ea7e0e8SSarah Sharp 35051ea7e0e8SSarah Sharp /* xHCI host controller doesn't want to enable this LPM state. */ 35061ea7e0e8SSarah Sharp if (timeout == 0) 35071ea7e0e8SSarah Sharp return; 35081ea7e0e8SSarah Sharp 35091ea7e0e8SSarah Sharp if (timeout < 0) { 35101ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not enable %s link state, " 35111ea7e0e8SSarah Sharp "xHCI error %i.\n", usb3_lpm_names[state], 35121ea7e0e8SSarah Sharp timeout); 35131ea7e0e8SSarah Sharp return; 35141ea7e0e8SSarah Sharp } 35151ea7e0e8SSarah Sharp 35161ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, timeout)) 35171ea7e0e8SSarah Sharp /* If we can't set the parent hub U1/U2 timeout, 35181ea7e0e8SSarah Sharp * device-initiated LPM won't be allowed either, so let the xHCI 35191ea7e0e8SSarah Sharp * host know that this link state won't be enabled. 35201ea7e0e8SSarah Sharp */ 35211ea7e0e8SSarah Sharp hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); 35221ea7e0e8SSarah Sharp 35231ea7e0e8SSarah Sharp /* Only a configured device will accept the Set Feature U1/U2_ENABLE */ 35241ea7e0e8SSarah Sharp else if (udev->actconfig) 35251ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, true); 35261ea7e0e8SSarah Sharp 35271ea7e0e8SSarah Sharp } 35281ea7e0e8SSarah Sharp 35291ea7e0e8SSarah Sharp /* 35301ea7e0e8SSarah Sharp * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated 35311ea7e0e8SSarah Sharp * U1/U2 entry. 35321ea7e0e8SSarah Sharp * 35331ea7e0e8SSarah Sharp * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. 35341ea7e0e8SSarah Sharp * If zero is returned, the parent will not allow the link to go into U1/U2. 35351ea7e0e8SSarah Sharp * 35361ea7e0e8SSarah Sharp * If zero is returned, device-initiated U1/U2 entry may still be enabled, but 35371ea7e0e8SSarah Sharp * it won't have an effect on the bus link state because the parent hub will 35381ea7e0e8SSarah Sharp * still disallow device-initiated U1/U2 entry. 35391ea7e0e8SSarah Sharp * 35401ea7e0e8SSarah Sharp * If zero is returned, the xHCI host controller may still think U1/U2 entry is 35411ea7e0e8SSarah Sharp * possible. The result will be slightly more bus bandwidth will be taken up 35421ea7e0e8SSarah Sharp * (to account for U1/U2 exit latency), but it should be harmless. 35431ea7e0e8SSarah Sharp */ 35441ea7e0e8SSarah Sharp static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 35451ea7e0e8SSarah Sharp enum usb3_link_state state) 35461ea7e0e8SSarah Sharp { 35471ea7e0e8SSarah Sharp int feature; 35481ea7e0e8SSarah Sharp 35491ea7e0e8SSarah Sharp switch (state) { 35501ea7e0e8SSarah Sharp case USB3_LPM_U1: 35511ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 35521ea7e0e8SSarah Sharp break; 35531ea7e0e8SSarah Sharp case USB3_LPM_U2: 35541ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 35551ea7e0e8SSarah Sharp break; 35561ea7e0e8SSarah Sharp default: 35571ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", 35581ea7e0e8SSarah Sharp __func__); 35591ea7e0e8SSarah Sharp return -EINVAL; 35601ea7e0e8SSarah Sharp } 35611ea7e0e8SSarah Sharp 35621ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, 0)) 35631ea7e0e8SSarah Sharp return -EBUSY; 35641ea7e0e8SSarah Sharp 35651ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, false); 35661ea7e0e8SSarah Sharp 35671ea7e0e8SSarah Sharp if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) 35681ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " 35691ea7e0e8SSarah Sharp "bus schedule bandwidth may be impacted.\n", 35701ea7e0e8SSarah Sharp usb3_lpm_names[state]); 35711ea7e0e8SSarah Sharp return 0; 35721ea7e0e8SSarah Sharp } 35731ea7e0e8SSarah Sharp 35741ea7e0e8SSarah Sharp /* 35751ea7e0e8SSarah Sharp * Disable hub-initiated and device-initiated U1 and U2 entry. 35761ea7e0e8SSarah Sharp * Caller must own the bandwidth_mutex. 35771ea7e0e8SSarah Sharp * 35781ea7e0e8SSarah Sharp * This will call usb_enable_lpm() on failure, which will decrement 35791ea7e0e8SSarah Sharp * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. 35801ea7e0e8SSarah Sharp */ 35811ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 35821ea7e0e8SSarah Sharp { 35831ea7e0e8SSarah Sharp struct usb_hcd *hcd; 35841ea7e0e8SSarah Sharp 35851ea7e0e8SSarah Sharp if (!udev || !udev->parent || 35861ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 35871ea7e0e8SSarah Sharp !udev->lpm_capable) 35881ea7e0e8SSarah Sharp return 0; 35891ea7e0e8SSarah Sharp 35901ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 35911ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) 35921ea7e0e8SSarah Sharp return 0; 35931ea7e0e8SSarah Sharp 35941ea7e0e8SSarah Sharp udev->lpm_disable_count++; 359555558c33SDan Carpenter if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) 35961ea7e0e8SSarah Sharp return 0; 35971ea7e0e8SSarah Sharp 35981ea7e0e8SSarah Sharp /* If LPM is enabled, attempt to disable it. */ 35991ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) 36001ea7e0e8SSarah Sharp goto enable_lpm; 36011ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) 36021ea7e0e8SSarah Sharp goto enable_lpm; 36031ea7e0e8SSarah Sharp 36041ea7e0e8SSarah Sharp return 0; 36051ea7e0e8SSarah Sharp 36061ea7e0e8SSarah Sharp enable_lpm: 36071ea7e0e8SSarah Sharp usb_enable_lpm(udev); 36081ea7e0e8SSarah Sharp return -EBUSY; 36091ea7e0e8SSarah Sharp } 36101ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 36111ea7e0e8SSarah Sharp 36121ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ 36131ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 36141ea7e0e8SSarah Sharp { 36151ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 36161ea7e0e8SSarah Sharp int ret; 36171ea7e0e8SSarah Sharp 36181ea7e0e8SSarah Sharp if (!hcd) 36191ea7e0e8SSarah Sharp return -EINVAL; 36201ea7e0e8SSarah Sharp 36211ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 36221ea7e0e8SSarah Sharp ret = usb_disable_lpm(udev); 36231ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 36241ea7e0e8SSarah Sharp 36251ea7e0e8SSarah Sharp return ret; 36261ea7e0e8SSarah Sharp } 36271ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 36281ea7e0e8SSarah Sharp 36291ea7e0e8SSarah Sharp /* 36301ea7e0e8SSarah Sharp * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The 36311ea7e0e8SSarah Sharp * xHCI host policy may prevent U1 or U2 from being enabled. 36321ea7e0e8SSarah Sharp * 36331ea7e0e8SSarah Sharp * Other callers may have disabled link PM, so U1 and U2 entry will be disabled 36341ea7e0e8SSarah Sharp * until the lpm_disable_count drops to zero. Caller must own the 36351ea7e0e8SSarah Sharp * bandwidth_mutex. 36361ea7e0e8SSarah Sharp */ 36371ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) 36381ea7e0e8SSarah Sharp { 36391ea7e0e8SSarah Sharp struct usb_hcd *hcd; 36401ea7e0e8SSarah Sharp 36411ea7e0e8SSarah Sharp if (!udev || !udev->parent || 36421ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 36431ea7e0e8SSarah Sharp !udev->lpm_capable) 36441ea7e0e8SSarah Sharp return; 36451ea7e0e8SSarah Sharp 36461ea7e0e8SSarah Sharp udev->lpm_disable_count--; 36471ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 36481ea7e0e8SSarah Sharp /* Double check that we can both enable and disable LPM. 36491ea7e0e8SSarah Sharp * Device must be configured to accept set feature U1/U2 timeout. 36501ea7e0e8SSarah Sharp */ 36511ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || 36521ea7e0e8SSarah Sharp !hcd->driver->disable_usb3_lpm_timeout) 36531ea7e0e8SSarah Sharp return; 36541ea7e0e8SSarah Sharp 36551ea7e0e8SSarah Sharp if (udev->lpm_disable_count > 0) 36561ea7e0e8SSarah Sharp return; 36571ea7e0e8SSarah Sharp 36581ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U1); 36591ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U2); 36601ea7e0e8SSarah Sharp } 36611ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 36621ea7e0e8SSarah Sharp 36631ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ 36641ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) 36651ea7e0e8SSarah Sharp { 36661ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 36671ea7e0e8SSarah Sharp 36681ea7e0e8SSarah Sharp if (!hcd) 36691ea7e0e8SSarah Sharp return; 36701ea7e0e8SSarah Sharp 36711ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 36721ea7e0e8SSarah Sharp usb_enable_lpm(udev); 36731ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 36741ea7e0e8SSarah Sharp } 36751ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 36761ea7e0e8SSarah Sharp 36771ea7e0e8SSarah Sharp 3678d388dab7SAlan Stern #else /* CONFIG_PM */ 3679d388dab7SAlan Stern 3680511366daSAndrew Morton #define hub_suspend NULL 3681511366daSAndrew Morton #define hub_resume NULL 3682f07600cfSAlan Stern #define hub_reset_resume NULL 36831ea7e0e8SSarah Sharp 36841ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 36851ea7e0e8SSarah Sharp { 36861ea7e0e8SSarah Sharp return 0; 36871ea7e0e8SSarah Sharp } 3688e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 36891ea7e0e8SSarah Sharp 36901ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) { } 3691e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 36921ea7e0e8SSarah Sharp 36931ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 36941ea7e0e8SSarah Sharp { 36951ea7e0e8SSarah Sharp return 0; 36961ea7e0e8SSarah Sharp } 3697e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 36981ea7e0e8SSarah Sharp 36991ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) { } 3700e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 3701f74631e3SSarah Sharp 3702f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 3703f74631e3SSarah Sharp { 3704f74631e3SSarah Sharp return 0; 3705f74631e3SSarah Sharp } 3706f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 3707f74631e3SSarah Sharp 3708f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) { } 3709f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 3710d388dab7SAlan Stern #endif 3711d388dab7SAlan Stern 37121da177e4SLinus Torvalds 37131da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 37141da177e4SLinus Torvalds * 37151da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 37161da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 37171da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 37181da177e4SLinus Torvalds * 37191da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 37201da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 37211da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 37221da177e4SLinus Torvalds * 37231da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 37241da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 37251da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 37261da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 37271da177e4SLinus Torvalds */ 37281da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 37291da177e4SLinus Torvalds { 37301da177e4SLinus Torvalds int ret; 37311da177e4SLinus Torvalds int total_time, stable_time = 0; 37321da177e4SLinus Torvalds u16 portchange, portstatus; 37331da177e4SLinus Torvalds unsigned connection = 0xffff; 37341da177e4SLinus Torvalds 37351da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 37361da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 37371da177e4SLinus Torvalds if (ret < 0) 37381da177e4SLinus Torvalds return ret; 37391da177e4SLinus Torvalds 37401da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 37411da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 37421da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 37431da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 37441da177e4SLinus Torvalds break; 37451da177e4SLinus Torvalds } else { 37461da177e4SLinus Torvalds stable_time = 0; 37471da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 37481da177e4SLinus Torvalds } 37491da177e4SLinus Torvalds 37501da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 37511da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 37521da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 37531da177e4SLinus Torvalds } 37541da177e4SLinus Torvalds 37551da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 37561da177e4SLinus Torvalds break; 37571da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 37581da177e4SLinus Torvalds } 37591da177e4SLinus Torvalds 37601da177e4SLinus Torvalds dev_dbg (hub->intfdev, 37611da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 37621da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 37631da177e4SLinus Torvalds 37641da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 37651da177e4SLinus Torvalds return -ETIMEDOUT; 37661da177e4SLinus Torvalds return portstatus; 37671da177e4SLinus Torvalds } 37681da177e4SLinus Torvalds 3769fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 37701da177e4SLinus Torvalds { 3771ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 3772ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 37732caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 37741da177e4SLinus Torvalds } 3775fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 37761da177e4SLinus Torvalds 37771da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 37781da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 37791da177e4SLinus Torvalds 37804326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 37811da177e4SLinus Torvalds { 37821da177e4SLinus Torvalds int retval; 3783c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 37841da177e4SLinus Torvalds 3785c6515272SSarah Sharp /* 3786c6515272SSarah Sharp * The host controller will choose the device address, 3787c6515272SSarah Sharp * instead of the core having chosen it earlier 3788c6515272SSarah Sharp */ 3789c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 37901da177e4SLinus Torvalds return -EINVAL; 37911da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 37921da177e4SLinus Torvalds return 0; 37931da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 37941da177e4SLinus Torvalds return -EINVAL; 3795c8d4af8eSAndiry Xu if (hcd->driver->address_device) 3796c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 3797c8d4af8eSAndiry Xu else 37981da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 37994326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 38001da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 38011da177e4SLinus Torvalds if (retval == 0) { 38023b29b68bSAlan Stern update_devnum(udev, devnum); 38034953d141SDavid Vrabel /* Device now using proper address. */ 38041da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 3805fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 38061da177e4SLinus Torvalds } 38071da177e4SLinus Torvalds return retval; 38081da177e4SLinus Torvalds } 38091da177e4SLinus Torvalds 38101da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 38111da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 38121da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 38131da177e4SLinus Torvalds * 38141da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 3815742120c6SMing Lei * usb_reset_and_verify_device), the caller must own the device lock. For a 38161da177e4SLinus Torvalds * newly detected device that is not accessible through any global 38171da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 38181da177e4SLinus Torvalds */ 38191da177e4SLinus Torvalds static int 38201da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 38211da177e4SLinus Torvalds int retry_counter) 38221da177e4SLinus Torvalds { 38234186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 38241da177e4SLinus Torvalds 38251da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 3826e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 38271da177e4SLinus Torvalds int i, j, retval; 38281da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 38291da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 3830e538dfdaSMichal Nazarewicz const char *speed; 38314326ed0bSAlan Stern int devnum = udev->devnum; 38321da177e4SLinus Torvalds 38331da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 38341da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 38351da177e4SLinus Torvalds */ 38361da177e4SLinus Torvalds if (!hdev->parent) { 38371da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 38381da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 38391da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 38401da177e4SLinus Torvalds } 38411da177e4SLinus Torvalds 38421da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 38431da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 38441da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 38451da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 38461da177e4SLinus Torvalds 38474186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 38481da177e4SLinus Torvalds 38491da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 3850e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 385175d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 38521da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 38531da177e4SLinus Torvalds goto fail; 38541da177e4SLinus Torvalds /* success, speed is known */ 385507194ab7SLuben Tuikov 38561da177e4SLinus Torvalds retval = -ENODEV; 38571da177e4SLinus Torvalds 38581da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 38591da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 38601da177e4SLinus Torvalds goto fail; 38611da177e4SLinus Torvalds } 38621da177e4SLinus Torvalds oldspeed = udev->speed; 38631da177e4SLinus Torvalds 38641da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 38651da177e4SLinus Torvalds * it's fixed size except for full speed devices. 38665bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 38675bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 38681da177e4SLinus Torvalds */ 38691da177e4SLinus Torvalds switch (udev->speed) { 38706b403b02SSarah Sharp case USB_SPEED_SUPER: 3871551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 3872551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 38735bb6e0aeSInaky Perez-Gonzalez break; 38741da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 3875551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 38761da177e4SLinus Torvalds break; 38771da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 38781da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 38791da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 38801da177e4SLinus Torvalds * then correct our initial guess. 38811da177e4SLinus Torvalds */ 3882551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 38831da177e4SLinus Torvalds break; 38841da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 3885551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 38861da177e4SLinus Torvalds break; 38871da177e4SLinus Torvalds default: 38881da177e4SLinus Torvalds goto fail; 38891da177e4SLinus Torvalds } 38901da177e4SLinus Torvalds 3891e538dfdaSMichal Nazarewicz if (udev->speed == USB_SPEED_WIRELESS) 3892e538dfdaSMichal Nazarewicz speed = "variable speed Wireless"; 3893e538dfdaSMichal Nazarewicz else 3894e538dfdaSMichal Nazarewicz speed = usb_speed_string(udev->speed); 3895e538dfdaSMichal Nazarewicz 3896c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 389783a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 3898e538dfdaSMichal Nazarewicz "%s %s USB device number %d using %s\n", 3899e538dfdaSMichal Nazarewicz (udev->config) ? "reset" : "new", speed, 39003b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 39011da177e4SLinus Torvalds 39021da177e4SLinus Torvalds /* Set up TT records, if needed */ 39031da177e4SLinus Torvalds if (hdev->tt) { 39041da177e4SLinus Torvalds udev->tt = hdev->tt; 39051da177e4SLinus Torvalds udev->ttport = hdev->ttport; 39061da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 39071da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 3908d199c96dSAlan Stern if (!hub->tt.hub) { 3909d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 3910d199c96dSAlan Stern retval = -EINVAL; 3911d199c96dSAlan Stern goto fail; 3912d199c96dSAlan Stern } 39131da177e4SLinus Torvalds udev->tt = &hub->tt; 39141da177e4SLinus Torvalds udev->ttport = port1; 39151da177e4SLinus Torvalds } 39161da177e4SLinus Torvalds 39171da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 39181da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 39191da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 39201da177e4SLinus Torvalds * Change it cautiously. 39211da177e4SLinus Torvalds * 39221da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 39231da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 39241da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 39251da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 39261da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 39271da177e4SLinus Torvalds * value. 39281da177e4SLinus Torvalds */ 39291da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 3930c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { 39311da177e4SLinus Torvalds struct usb_device_descriptor *buf; 39321da177e4SLinus Torvalds int r = 0; 39331da177e4SLinus Torvalds 39341da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 39351da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 39361da177e4SLinus Torvalds if (!buf) { 39371da177e4SLinus Torvalds retval = -ENOMEM; 39381da177e4SLinus Torvalds continue; 39391da177e4SLinus Torvalds } 39401da177e4SLinus Torvalds 3941b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 3942b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 3943b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 39441da177e4SLinus Torvalds */ 39451da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 39461da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 39471da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 39481da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 39491da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 39501da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 3951fd7c519dSJaroslav Kysela initial_descriptor_timeout); 39521da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 39535bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 39541da177e4SLinus Torvalds if (buf->bDescriptorType == 39551da177e4SLinus Torvalds USB_DT_DEVICE) { 39561da177e4SLinus Torvalds r = 0; 39571da177e4SLinus Torvalds break; 39581da177e4SLinus Torvalds } 39591da177e4SLinus Torvalds /* FALL THROUGH */ 39601da177e4SLinus Torvalds default: 39611da177e4SLinus Torvalds if (r == 0) 39621da177e4SLinus Torvalds r = -EPROTO; 39631da177e4SLinus Torvalds break; 39641da177e4SLinus Torvalds } 39651da177e4SLinus Torvalds if (r == 0) 39661da177e4SLinus Torvalds break; 39671da177e4SLinus Torvalds } 39681da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 39691da177e4SLinus Torvalds buf->bMaxPacketSize0; 39701da177e4SLinus Torvalds kfree(buf); 39711da177e4SLinus Torvalds 397275d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 39731da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 39741da177e4SLinus Torvalds goto fail; 39751da177e4SLinus Torvalds if (oldspeed != udev->speed) { 39761da177e4SLinus Torvalds dev_dbg(&udev->dev, 39771da177e4SLinus Torvalds "device reset changed speed!\n"); 39781da177e4SLinus Torvalds retval = -ENODEV; 39791da177e4SLinus Torvalds goto fail; 39801da177e4SLinus Torvalds } 39811da177e4SLinus Torvalds if (r) { 3982b9cef6c3SWu Fengguang dev_err(&udev->dev, 3983b9cef6c3SWu Fengguang "device descriptor read/64, error %d\n", 3984b9cef6c3SWu Fengguang r); 39851da177e4SLinus Torvalds retval = -EMSGSIZE; 39861da177e4SLinus Torvalds continue; 39871da177e4SLinus Torvalds } 39881da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 39891da177e4SLinus Torvalds } 39901da177e4SLinus Torvalds 39916c529cdcSInaky Perez-Gonzalez /* 39926c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 39936c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 39946c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 39956c529cdcSInaky Perez-Gonzalez */ 39966c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 39971da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 39984326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 39991da177e4SLinus Torvalds if (retval >= 0) 40001da177e4SLinus Torvalds break; 40011da177e4SLinus Torvalds msleep(200); 40021da177e4SLinus Torvalds } 40031da177e4SLinus Torvalds if (retval < 0) { 40041da177e4SLinus Torvalds dev_err(&udev->dev, 40051da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 40064326ed0bSAlan Stern devnum, retval); 40071da177e4SLinus Torvalds goto fail; 40081da177e4SLinus Torvalds } 4009c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 4010c6515272SSarah Sharp devnum = udev->devnum; 4011c6515272SSarah Sharp dev_info(&udev->dev, 40123b29b68bSAlan Stern "%s SuperSpeed USB device number %d using %s\n", 4013c6515272SSarah Sharp (udev->config) ? "reset" : "new", 40143b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 4015c6515272SSarah Sharp } 40161da177e4SLinus Torvalds 40171da177e4SLinus Torvalds /* cope with hardware quirkiness: 40181da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 40191da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 40201da177e4SLinus Torvalds */ 40211da177e4SLinus Torvalds msleep(10); 4022c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) 40231da177e4SLinus Torvalds break; 40246c529cdcSInaky Perez-Gonzalez } 40251da177e4SLinus Torvalds 40261da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 40271da177e4SLinus Torvalds if (retval < 8) { 4028b9cef6c3SWu Fengguang dev_err(&udev->dev, 4029b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 4030b9cef6c3SWu Fengguang retval); 40311da177e4SLinus Torvalds if (retval >= 0) 40321da177e4SLinus Torvalds retval = -EMSGSIZE; 40331da177e4SLinus Torvalds } else { 40341da177e4SLinus Torvalds retval = 0; 40351da177e4SLinus Torvalds break; 40361da177e4SLinus Torvalds } 40371da177e4SLinus Torvalds } 40381da177e4SLinus Torvalds if (retval) 40391da177e4SLinus Torvalds goto fail; 40401da177e4SLinus Torvalds 4041b76baa81SPeter Chen if (hcd->phy && !hdev->parent) 4042ac96511bSPeter Chen usb_phy_notify_connect(hcd->phy, udev->speed); 4043b76baa81SPeter Chen 4044d8aec3dbSElric Fu /* 4045d8aec3dbSElric Fu * Some superspeed devices have finished the link training process 4046d8aec3dbSElric Fu * and attached to a superspeed hub port, but the device descriptor 4047d8aec3dbSElric Fu * got from those devices show they aren't superspeed devices. Warm 4048d8aec3dbSElric Fu * reset the port attached by the devices can fix them. 4049d8aec3dbSElric Fu */ 4050d8aec3dbSElric Fu if ((udev->speed == USB_SPEED_SUPER) && 4051d8aec3dbSElric Fu (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { 4052d8aec3dbSElric Fu dev_err(&udev->dev, "got a wrong device descriptor, " 4053d8aec3dbSElric Fu "warm reset device\n"); 4054d8aec3dbSElric Fu hub_port_reset(hub, port1, udev, 4055d8aec3dbSElric Fu HUB_BH_RESET_TIME, true); 4056d8aec3dbSElric Fu retval = -EINVAL; 4057d8aec3dbSElric Fu goto fail; 4058d8aec3dbSElric Fu } 4059d8aec3dbSElric Fu 40606b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 40616b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 40626b403b02SSarah Sharp i = 512; 40636b403b02SSarah Sharp else 40646b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 406529cc8897SKuninori Morimoto if (usb_endpoint_maxp(&udev->ep0.desc) != i) { 406656626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 40671da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 406856626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 40691da177e4SLinus Torvalds retval = -EMSGSIZE; 40701da177e4SLinus Torvalds goto fail; 40711da177e4SLinus Torvalds } 407256626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 40731da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 407456626a72SAlan Stern else 407556626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 40761da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 4077fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 40781da177e4SLinus Torvalds } 40791da177e4SLinus Torvalds 40801da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 40811da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 4082b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 4083b9cef6c3SWu Fengguang retval); 40841da177e4SLinus Torvalds if (retval >= 0) 40851da177e4SLinus Torvalds retval = -ENOMSG; 40861da177e4SLinus Torvalds goto fail; 40871da177e4SLinus Torvalds } 40881da177e4SLinus Torvalds 40891ff4df56SAndiry Xu if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { 40901ff4df56SAndiry Xu retval = usb_get_bos_descriptor(udev); 409151e0a012SSarah Sharp if (!retval) { 4092d9b2099cSSarah Sharp udev->lpm_capable = usb_device_supports_lpm(udev); 409351e0a012SSarah Sharp usb_set_lpm_parameters(udev); 409451e0a012SSarah Sharp } 40951ff4df56SAndiry Xu } 40963148bf04SAndiry Xu 40971da177e4SLinus Torvalds retval = 0; 409848f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 409948f24970SAlek Du if (hcd->driver->update_device) 410048f24970SAlek Du hcd->driver->update_device(hcd, udev); 41011da177e4SLinus Torvalds fail: 41024326ed0bSAlan Stern if (retval) { 41031da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 41043b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 41054326ed0bSAlan Stern } 41064186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 41071da177e4SLinus Torvalds return retval; 41081da177e4SLinus Torvalds } 41091da177e4SLinus Torvalds 41101da177e4SLinus Torvalds static void 41111da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 41121da177e4SLinus Torvalds { 41131da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 41141da177e4SLinus Torvalds int status; 41151da177e4SLinus Torvalds 4116e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 41171da177e4SLinus Torvalds if (qual == NULL) 41181da177e4SLinus Torvalds return; 41191da177e4SLinus Torvalds 41201da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 41211da177e4SLinus Torvalds qual, sizeof *qual); 41221da177e4SLinus Torvalds if (status == sizeof *qual) { 41231da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 41241da177e4SLinus Torvalds "connect to a high speed hub\n"); 41251da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 41261da177e4SLinus Torvalds if (hub->has_indicators) { 41271da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 4128c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 41291da177e4SLinus Torvalds } 41301da177e4SLinus Torvalds } 41311da177e4SLinus Torvalds kfree(qual); 41321da177e4SLinus Torvalds } 41331da177e4SLinus Torvalds 41341da177e4SLinus Torvalds static unsigned 41351da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 41361da177e4SLinus Torvalds { 41371da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 41381da177e4SLinus Torvalds int remaining; 413955c52718SAlan Stern int port1; 41401da177e4SLinus Torvalds 414155c52718SAlan Stern if (!hub->limited_power) 41421da177e4SLinus Torvalds return 0; 41431da177e4SLinus Torvalds 414455c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 414555c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 4146ff823c79SLan Tianyu struct usb_device *udev = hub->ports[port1 - 1]->child; 414755c52718SAlan Stern int delta; 41481da177e4SLinus Torvalds 41491da177e4SLinus Torvalds if (!udev) 41501da177e4SLinus Torvalds continue; 41511da177e4SLinus Torvalds 415255c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 415355c52718SAlan Stern * or 8mA for OTG ports */ 41541da177e4SLinus Torvalds if (udev->actconfig) 415555c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 415655c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 415755c52718SAlan Stern delta = 100; 41581da177e4SLinus Torvalds else 415955c52718SAlan Stern delta = 8; 416055c52718SAlan Stern if (delta > hub->mA_per_port) 4161b9cef6c3SWu Fengguang dev_warn(&udev->dev, 4162b9cef6c3SWu Fengguang "%dmA is over %umA budget for port %d!\n", 416355c52718SAlan Stern delta, hub->mA_per_port, port1); 41641da177e4SLinus Torvalds remaining -= delta; 41651da177e4SLinus Torvalds } 41661da177e4SLinus Torvalds if (remaining < 0) { 416755c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 416855c52718SAlan Stern - remaining); 41691da177e4SLinus Torvalds remaining = 0; 41701da177e4SLinus Torvalds } 41711da177e4SLinus Torvalds return remaining; 41721da177e4SLinus Torvalds } 41731da177e4SLinus Torvalds 41741da177e4SLinus Torvalds /* Handle physical or logical connection change events. 41751da177e4SLinus Torvalds * This routine is called when: 41761da177e4SLinus Torvalds * a port connection-change occurs; 41771da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 4178742120c6SMing Lei * usb_reset_and_verify_device() encounters changed descriptors (as from 41791da177e4SLinus Torvalds * a firmware download) 41801da177e4SLinus Torvalds * caller already locked the hub 41811da177e4SLinus Torvalds */ 41821da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 41831da177e4SLinus Torvalds u16 portstatus, u16 portchange) 41841da177e4SLinus Torvalds { 41851da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 41861da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 418790da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 418824618b0cSAlan Stern unsigned wHubCharacteristics = 418924618b0cSAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 41908808f00cSAlan Stern struct usb_device *udev; 41911da177e4SLinus Torvalds int status, i; 41921da177e4SLinus Torvalds 41931da177e4SLinus Torvalds dev_dbg (hub_dev, 41941da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 4195131dec34SSarah Sharp port1, portstatus, portchange, portspeed(hub, portstatus)); 41961da177e4SLinus Torvalds 41971da177e4SLinus Torvalds if (hub->has_indicators) { 41981da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 41991da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 42001da177e4SLinus Torvalds } 42011da177e4SLinus Torvalds 42021da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 42031da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 42041da177e4SLinus Torvalds if (hdev->bus->is_b_host) 420524618b0cSAlan Stern portchange &= ~(USB_PORT_STAT_C_CONNECTION | 420624618b0cSAlan Stern USB_PORT_STAT_C_ENABLE); 42071da177e4SLinus Torvalds #endif 42081da177e4SLinus Torvalds 42098808f00cSAlan Stern /* Try to resuscitate an existing device */ 4210ff823c79SLan Tianyu udev = hub->ports[port1 - 1]->child; 42118808f00cSAlan Stern if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 42128808f00cSAlan Stern udev->state != USB_STATE_NOTATTACHED) { 42138808f00cSAlan Stern usb_lock_device(udev); 42148808f00cSAlan Stern if (portstatus & USB_PORT_STAT_ENABLE) { 42158808f00cSAlan Stern status = 0; /* Nothing to do */ 42168808f00cSAlan Stern 42178808f00cSAlan Stern #ifdef CONFIG_USB_SUSPEND 42185257d97aSAlan Stern } else if (udev->state == USB_STATE_SUSPENDED && 42195257d97aSAlan Stern udev->persist_enabled) { 42208808f00cSAlan Stern /* For a suspended device, treat this as a 42218808f00cSAlan Stern * remote wakeup event. 42228808f00cSAlan Stern */ 42230534d468SAlan Stern status = usb_remote_wakeup(udev); 42248808f00cSAlan Stern #endif 42258808f00cSAlan Stern 42268808f00cSAlan Stern } else { 42275257d97aSAlan Stern status = -ENODEV; /* Don't resuscitate */ 42288808f00cSAlan Stern } 42298808f00cSAlan Stern usb_unlock_device(udev); 42308808f00cSAlan Stern 42318808f00cSAlan Stern if (status == 0) { 42328808f00cSAlan Stern clear_bit(port1, hub->change_bits); 42338808f00cSAlan Stern return; 42348808f00cSAlan Stern } 42358808f00cSAlan Stern } 42368808f00cSAlan Stern 423724618b0cSAlan Stern /* Disconnect any existing devices under this port */ 4238b76baa81SPeter Chen if (udev) { 4239b76baa81SPeter Chen if (hcd->phy && !hdev->parent && 4240b76baa81SPeter Chen !(portstatus & USB_PORT_STAT_CONNECTION)) 4241ac96511bSPeter Chen usb_phy_notify_disconnect(hcd->phy, udev->speed); 4242ff823c79SLan Tianyu usb_disconnect(&hub->ports[port1 - 1]->child); 4243b76baa81SPeter Chen } 424424618b0cSAlan Stern clear_bit(port1, hub->change_bits); 424524618b0cSAlan Stern 4246253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 4247253e0572SAlan Stern * disconnect or the connect status changes. 4248253e0572SAlan Stern */ 4249253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4250253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 4251253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 4252253e0572SAlan Stern 42535257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 42545257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 42555257d97aSAlan Stern status = hub_port_debounce(hub, port1); 42565257d97aSAlan Stern if (status < 0) { 42575257d97aSAlan Stern if (printk_ratelimit()) 42585257d97aSAlan Stern dev_err(hub_dev, "connect-debounce failed, " 42595257d97aSAlan Stern "port %d disabled\n", port1); 42605257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 42615257d97aSAlan Stern } else { 42625257d97aSAlan Stern portstatus = status; 42635257d97aSAlan Stern } 42645257d97aSAlan Stern } 42655257d97aSAlan Stern 4266253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 4267253e0572SAlan Stern * the device was "removed". 4268253e0572SAlan Stern */ 4269253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4270253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 42711da177e4SLinus Torvalds 42721da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 427374ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 42740ed9a57eSAndiry Xu && !port_is_power_on(hub, portstatus)) 42751da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 42761da177e4SLinus Torvalds 42771da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 42781da177e4SLinus Torvalds goto done; 42791da177e4SLinus Torvalds return; 42801da177e4SLinus Torvalds } 42811da177e4SLinus Torvalds 42821da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 42831da177e4SLinus Torvalds 42841da177e4SLinus Torvalds /* reallocate for each attempt, since references 42851da177e4SLinus Torvalds * to the previous one can escape in various ways 42861da177e4SLinus Torvalds */ 42871da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 42881da177e4SLinus Torvalds if (!udev) { 42891da177e4SLinus Torvalds dev_err (hub_dev, 42901da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 42911da177e4SLinus Torvalds port1); 42921da177e4SLinus Torvalds goto done; 42931da177e4SLinus Torvalds } 42941da177e4SLinus Torvalds 42951da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 429655c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 4297b6956ffaSAlan Stern udev->level = hdev->level + 1; 42988af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 42991da177e4SLinus Torvalds 4300131dec34SSarah Sharp /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ 4301131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 4302e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 4303e7b77172SSarah Sharp else 4304e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 4305e7b77172SSarah Sharp 43063b29b68bSAlan Stern choose_devnum(udev); 4307c6515272SSarah Sharp if (udev->devnum <= 0) { 4308c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 4309c6515272SSarah Sharp goto loop; 4310c6515272SSarah Sharp } 4311c6515272SSarah Sharp 4312e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 43131da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 43141da177e4SLinus Torvalds if (status < 0) 43151da177e4SLinus Torvalds goto loop; 43161da177e4SLinus Torvalds 431793362a87SPhil Dibowitz usb_detect_quirks(udev); 431893362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 431993362a87SPhil Dibowitz msleep(1000); 432093362a87SPhil Dibowitz 43211da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 43221da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 43231da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 43241da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 43251da177e4SLinus Torvalds * on the parent. 43261da177e4SLinus Torvalds */ 43271da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 432855c52718SAlan Stern && udev->bus_mA <= 100) { 43291da177e4SLinus Torvalds u16 devstat; 43301da177e4SLinus Torvalds 43311da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 43321da177e4SLinus Torvalds &devstat); 433355c52718SAlan Stern if (status < 2) { 43341da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 43351da177e4SLinus Torvalds goto loop_disable; 43361da177e4SLinus Torvalds } 433755c52718SAlan Stern le16_to_cpus(&devstat); 43381da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 43391da177e4SLinus Torvalds dev_err(&udev->dev, 43401da177e4SLinus Torvalds "can't connect bus-powered hub " 43411da177e4SLinus Torvalds "to this port\n"); 43421da177e4SLinus Torvalds if (hub->has_indicators) { 43431da177e4SLinus Torvalds hub->indicator[port1-1] = 43441da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 4345c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 43461da177e4SLinus Torvalds } 43471da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 43481da177e4SLinus Torvalds goto loop_disable; 43491da177e4SLinus Torvalds } 43501da177e4SLinus Torvalds } 43511da177e4SLinus Torvalds 43521da177e4SLinus Torvalds /* check for devices running slower than they could */ 43531da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 43541da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 43551da177e4SLinus Torvalds && highspeed_hubs != 0) 43561da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 43571da177e4SLinus Torvalds 4358fa286188SGreg Kroah-Hartman /* Store the parent's children[] pointer. At this point 43591da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 43601da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 43611da177e4SLinus Torvalds */ 43621da177e4SLinus Torvalds status = 0; 43631da177e4SLinus Torvalds 43641da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 43651da177e4SLinus Torvalds * been disconnected; we would race with the 43661da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 43671da177e4SLinus Torvalds */ 43681da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 43691da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 43701da177e4SLinus Torvalds status = -ENOTCONN; 43711da177e4SLinus Torvalds else 4372ff823c79SLan Tianyu hub->ports[port1 - 1]->child = udev; 43731da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 43741da177e4SLinus Torvalds 43751da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 43761da177e4SLinus Torvalds if (!status) { 43771da177e4SLinus Torvalds status = usb_new_device(udev); 43781da177e4SLinus Torvalds if (status) { 43791da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 4380ff823c79SLan Tianyu hub->ports[port1 - 1]->child = NULL; 43811da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 43821da177e4SLinus Torvalds } 43831da177e4SLinus Torvalds } 43841da177e4SLinus Torvalds 43851da177e4SLinus Torvalds if (status) 43861da177e4SLinus Torvalds goto loop_disable; 43871da177e4SLinus Torvalds 43881da177e4SLinus Torvalds status = hub_power_remaining(hub); 43891da177e4SLinus Torvalds if (status) 439055c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 43911da177e4SLinus Torvalds 43921da177e4SLinus Torvalds return; 43931da177e4SLinus Torvalds 43941da177e4SLinus Torvalds loop_disable: 43951da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 43961da177e4SLinus Torvalds loop: 4397fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 43983b29b68bSAlan Stern release_devnum(udev); 4399f7410cedSHerbert Xu hub_free_dev(udev); 44001da177e4SLinus Torvalds usb_put_dev(udev); 4401ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 44021da177e4SLinus Torvalds break; 44031da177e4SLinus Torvalds } 44043a31155cSAlan Stern if (hub->hdev->parent || 44053a31155cSAlan Stern !hcd->driver->port_handed_over || 44063a31155cSAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) 44073a31155cSAlan Stern dev_err(hub_dev, "unable to enumerate USB device on port %d\n", 44083a31155cSAlan Stern port1); 44091da177e4SLinus Torvalds 44101da177e4SLinus Torvalds done: 44111da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 441290da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 441390da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 44141da177e4SLinus Torvalds } 44151da177e4SLinus Torvalds 4416714b07beSSarah Sharp /* Returns 1 if there was a remote wakeup and a connect status change. */ 4417714b07beSSarah Sharp static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 441872937e1eSSarah Sharp u16 portstatus, u16 portchange) 4419714b07beSSarah Sharp { 4420714b07beSSarah Sharp struct usb_device *hdev; 4421714b07beSSarah Sharp struct usb_device *udev; 4422714b07beSSarah Sharp int connect_change = 0; 4423714b07beSSarah Sharp int ret; 4424714b07beSSarah Sharp 4425714b07beSSarah Sharp hdev = hub->hdev; 4426ff823c79SLan Tianyu udev = hub->ports[port - 1]->child; 44274ee823b8SSarah Sharp if (!hub_is_superspeed(hdev)) { 4428714b07beSSarah Sharp if (!(portchange & USB_PORT_STAT_C_SUSPEND)) 4429714b07beSSarah Sharp return 0; 4430714b07beSSarah Sharp clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); 44314ee823b8SSarah Sharp } else { 44324ee823b8SSarah Sharp if (!udev || udev->state != USB_STATE_SUSPENDED || 443372937e1eSSarah Sharp (portstatus & USB_PORT_STAT_LINK_STATE) != 443472937e1eSSarah Sharp USB_SS_PORT_LS_U0) 44354ee823b8SSarah Sharp return 0; 44364ee823b8SSarah Sharp } 4437714b07beSSarah Sharp 4438714b07beSSarah Sharp if (udev) { 4439714b07beSSarah Sharp /* TRSMRCY = 10 msec */ 4440714b07beSSarah Sharp msleep(10); 4441714b07beSSarah Sharp 4442714b07beSSarah Sharp usb_lock_device(udev); 4443714b07beSSarah Sharp ret = usb_remote_wakeup(udev); 4444714b07beSSarah Sharp usb_unlock_device(udev); 4445714b07beSSarah Sharp if (ret < 0) 4446714b07beSSarah Sharp connect_change = 1; 4447714b07beSSarah Sharp } else { 4448714b07beSSarah Sharp ret = -ENODEV; 4449714b07beSSarah Sharp hub_port_disable(hub, port, 1); 4450714b07beSSarah Sharp } 4451714b07beSSarah Sharp dev_dbg(hub->intfdev, "resume on port %d, status %d\n", 4452714b07beSSarah Sharp port, ret); 4453714b07beSSarah Sharp return connect_change; 4454714b07beSSarah Sharp } 4455714b07beSSarah Sharp 44561da177e4SLinus Torvalds static void hub_events(void) 44571da177e4SLinus Torvalds { 44581da177e4SLinus Torvalds struct list_head *tmp; 44591da177e4SLinus Torvalds struct usb_device *hdev; 44601da177e4SLinus Torvalds struct usb_interface *intf; 44611da177e4SLinus Torvalds struct usb_hub *hub; 44621da177e4SLinus Torvalds struct device *hub_dev; 44631da177e4SLinus Torvalds u16 hubstatus; 44641da177e4SLinus Torvalds u16 hubchange; 44651da177e4SLinus Torvalds u16 portstatus; 44661da177e4SLinus Torvalds u16 portchange; 44671da177e4SLinus Torvalds int i, ret; 44684ee823b8SSarah Sharp int connect_change, wakeup_change; 44691da177e4SLinus Torvalds 44701da177e4SLinus Torvalds /* 44711da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 44721da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 44731da177e4SLinus Torvalds * safe since we delete the hub from the event list. 44741da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 44751da177e4SLinus Torvalds */ 44761da177e4SLinus Torvalds while (1) { 44771da177e4SLinus Torvalds 44781da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 44791da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 44801da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 44811da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 44821da177e4SLinus Torvalds break; 44831da177e4SLinus Torvalds } 44841da177e4SLinus Torvalds 44851da177e4SLinus Torvalds tmp = hub_event_list.next; 44861da177e4SLinus Torvalds list_del_init(tmp); 44871da177e4SLinus Torvalds 44881da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 4489e8054854SAlan Stern kref_get(&hub->kref); 4490e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 44911da177e4SLinus Torvalds 4492e8054854SAlan Stern hdev = hub->hdev; 4493e8054854SAlan Stern hub_dev = hub->intfdev; 4494e8054854SAlan Stern intf = to_usb_interface(hub_dev); 449540f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 44961da177e4SLinus Torvalds hdev->state, hub->descriptor 44971da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 44981da177e4SLinus Torvalds : 0, 44991da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 45001da177e4SLinus Torvalds (u16) hub->change_bits[0], 450140f122f3SAlan Stern (u16) hub->event_bits[0]); 45021da177e4SLinus Torvalds 45031da177e4SLinus Torvalds /* Lock the device, then check to see if we were 45041da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 450506b84e8aSAlan Stern usb_lock_device(hdev); 4506e8054854SAlan Stern if (unlikely(hub->disconnected)) 45079bbdf1e0SAlan Stern goto loop_disconnected; 45081da177e4SLinus Torvalds 45091da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 45101da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 45117de18d8bSAlan Stern hub->error = -ENODEV; 45124330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 45131da177e4SLinus Torvalds goto loop; 45141da177e4SLinus Torvalds } 45151da177e4SLinus Torvalds 451640f122f3SAlan Stern /* Autoresume */ 451740f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 451840f122f3SAlan Stern if (ret) { 451940f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 45201da177e4SLinus Torvalds goto loop; 452140f122f3SAlan Stern } 452240f122f3SAlan Stern 452340f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 452440f122f3SAlan Stern if (hub->quiescing) 452540f122f3SAlan Stern goto loop_autopm; 45261da177e4SLinus Torvalds 45271da177e4SLinus Torvalds if (hub->error) { 45281da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 45291da177e4SLinus Torvalds hub->error); 45301da177e4SLinus Torvalds 4531742120c6SMing Lei ret = usb_reset_device(hdev); 45321da177e4SLinus Torvalds if (ret) { 45331da177e4SLinus Torvalds dev_dbg (hub_dev, 45341da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 453540f122f3SAlan Stern goto loop_autopm; 45361da177e4SLinus Torvalds } 45371da177e4SLinus Torvalds 45381da177e4SLinus Torvalds hub->nerrors = 0; 45391da177e4SLinus Torvalds hub->error = 0; 45401da177e4SLinus Torvalds } 45411da177e4SLinus Torvalds 45421da177e4SLinus Torvalds /* deal with port status changes */ 45431da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 45441da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 45451da177e4SLinus Torvalds continue; 45461da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 454772937e1eSSarah Sharp wakeup_change = test_and_clear_bit(i, hub->wakeup_bits); 45481da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 45494ee823b8SSarah Sharp !connect_change && !wakeup_change) 45501da177e4SLinus Torvalds continue; 45511da177e4SLinus Torvalds 45521da177e4SLinus Torvalds ret = hub_port_status(hub, i, 45531da177e4SLinus Torvalds &portstatus, &portchange); 45541da177e4SLinus Torvalds if (ret < 0) 45551da177e4SLinus Torvalds continue; 45561da177e4SLinus Torvalds 45571da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 45581da177e4SLinus Torvalds clear_port_feature(hdev, i, 45591da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 45601da177e4SLinus Torvalds connect_change = 1; 45611da177e4SLinus Torvalds } 45621da177e4SLinus Torvalds 45631da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 45641da177e4SLinus Torvalds if (!connect_change) 45651da177e4SLinus Torvalds dev_dbg (hub_dev, 45661da177e4SLinus Torvalds "port %d enable change, " 45671da177e4SLinus Torvalds "status %08x\n", 45681da177e4SLinus Torvalds i, portstatus); 45691da177e4SLinus Torvalds clear_port_feature(hdev, i, 45701da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 45711da177e4SLinus Torvalds 45721da177e4SLinus Torvalds /* 45731da177e4SLinus Torvalds * EM interference sometimes causes badly 45741da177e4SLinus Torvalds * shielded USB devices to be shutdown by 45751da177e4SLinus Torvalds * the hub, this hack enables them again. 45761da177e4SLinus Torvalds * Works at least with mouse driver. 45771da177e4SLinus Torvalds */ 45781da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 45791da177e4SLinus Torvalds && !connect_change 4580ff823c79SLan Tianyu && hub->ports[i - 1]->child) { 45811da177e4SLinus Torvalds dev_err (hub_dev, 45821da177e4SLinus Torvalds "port %i " 45831da177e4SLinus Torvalds "disabled by hub (EMI?), " 45841da177e4SLinus Torvalds "re-enabling...\n", 45851da177e4SLinus Torvalds i); 45861da177e4SLinus Torvalds connect_change = 1; 45871da177e4SLinus Torvalds } 45881da177e4SLinus Torvalds } 45891da177e4SLinus Torvalds 459072937e1eSSarah Sharp if (hub_handle_remote_wakeup(hub, i, 459172937e1eSSarah Sharp portstatus, portchange)) 45921da177e4SLinus Torvalds connect_change = 1; 45931da177e4SLinus Torvalds 45941da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 4595752d57a8SPaul Bolle u16 status = 0; 4596752d57a8SPaul Bolle u16 unused; 4597752d57a8SPaul Bolle 4598752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change on port " 4599752d57a8SPaul Bolle "%d\n", i); 46001da177e4SLinus Torvalds clear_port_feature(hdev, i, 46011da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 4602752d57a8SPaul Bolle msleep(100); /* Cool down */ 46038520f380SAlan Stern hub_power_on(hub, true); 4604752d57a8SPaul Bolle hub_port_status(hub, i, &status, &unused); 4605752d57a8SPaul Bolle if (status & USB_PORT_STAT_OVERCURRENT) 4606752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 4607752d57a8SPaul Bolle "condition on port %d\n", i); 46081da177e4SLinus Torvalds } 46091da177e4SLinus Torvalds 46101da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 46111da177e4SLinus Torvalds dev_dbg (hub_dev, 46121da177e4SLinus Torvalds "reset change on port %d\n", 46131da177e4SLinus Torvalds i); 46141da177e4SLinus Torvalds clear_port_feature(hdev, i, 46151da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 46161da177e4SLinus Torvalds } 4617c7061574SSarah Sharp if ((portchange & USB_PORT_STAT_C_BH_RESET) && 4618c7061574SSarah Sharp hub_is_superspeed(hub->hdev)) { 4619c7061574SSarah Sharp dev_dbg(hub_dev, 4620c7061574SSarah Sharp "warm reset change on port %d\n", 4621c7061574SSarah Sharp i); 4622c7061574SSarah Sharp clear_port_feature(hdev, i, 4623c7061574SSarah Sharp USB_PORT_FEAT_C_BH_PORT_RESET); 4624c7061574SSarah Sharp } 4625dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_LINK_STATE) { 4626dbe79bbeSJohn Youn clear_port_feature(hub->hdev, i, 4627dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_LINK_STATE); 4628dbe79bbeSJohn Youn } 4629dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 4630dbe79bbeSJohn Youn dev_warn(hub_dev, 4631dbe79bbeSJohn Youn "config error on port %d\n", 4632dbe79bbeSJohn Youn i); 4633dbe79bbeSJohn Youn clear_port_feature(hub->hdev, i, 4634dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 4635dbe79bbeSJohn Youn } 46361da177e4SLinus Torvalds 46375e467f6eSAndiry Xu /* Warm reset a USB3 protocol port if it's in 46385e467f6eSAndiry Xu * SS.Inactive state. 46395e467f6eSAndiry Xu */ 46408bea2bd3SStanislaw Ledwon if (hub_port_warm_reset_required(hub, portstatus)) { 46415e467f6eSAndiry Xu dev_dbg(hub_dev, "warm reset port %d\n", i); 464275d7cf72SAndiry Xu hub_port_reset(hub, i, NULL, 464375d7cf72SAndiry Xu HUB_BH_RESET_TIME, true); 46445e467f6eSAndiry Xu } 46455e467f6eSAndiry Xu 46461da177e4SLinus Torvalds if (connect_change) 46471da177e4SLinus Torvalds hub_port_connect_change(hub, i, 46481da177e4SLinus Torvalds portstatus, portchange); 46491da177e4SLinus Torvalds } /* end for i */ 46501da177e4SLinus Torvalds 46511da177e4SLinus Torvalds /* deal with hub status changes */ 46521da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 46531da177e4SLinus Torvalds ; /* do nothing */ 46541da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 46551da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 46561da177e4SLinus Torvalds else { 46571da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 46581da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 46591da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 466055c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 466155c52718SAlan Stern /* FIXME: Is this always true? */ 466255c52718SAlan Stern hub->limited_power = 1; 4663403fae78Sjidong xiao else 4664403fae78Sjidong xiao hub->limited_power = 0; 46651da177e4SLinus Torvalds } 46661da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 4667752d57a8SPaul Bolle u16 status = 0; 4668752d57a8SPaul Bolle u16 unused; 4669752d57a8SPaul Bolle 4670752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 46711da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 4672752d57a8SPaul Bolle msleep(500); /* Cool down */ 46738520f380SAlan Stern hub_power_on(hub, true); 4674752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 4675752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 4676752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 4677752d57a8SPaul Bolle "condition\n"); 46781da177e4SLinus Torvalds } 46791da177e4SLinus Torvalds } 46801da177e4SLinus Torvalds 468140f122f3SAlan Stern loop_autopm: 46828e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 46838e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 46841da177e4SLinus Torvalds loop: 46858e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface_no_resume() in 46868e4ceb38SAlan Stern * kick_khubd() and allow autosuspend. 46878e4ceb38SAlan Stern */ 46888e4ceb38SAlan Stern usb_autopm_put_interface(intf); 46899bbdf1e0SAlan Stern loop_disconnected: 46901da177e4SLinus Torvalds usb_unlock_device(hdev); 4691e8054854SAlan Stern kref_put(&hub->kref, hub_release); 46921da177e4SLinus Torvalds 46931da177e4SLinus Torvalds } /* end while (1) */ 46941da177e4SLinus Torvalds } 46951da177e4SLinus Torvalds 46961da177e4SLinus Torvalds static int hub_thread(void *__unused) 46971da177e4SLinus Torvalds { 46983bb1af52SAlan Stern /* khubd needs to be freezable to avoid intefering with USB-PERSIST 46993bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 47003bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 47013bb1af52SAlan Stern * the companion full-speed controller. 47023bb1af52SAlan Stern */ 470383144186SRafael J. Wysocki set_freezable(); 47043bb1af52SAlan Stern 47051da177e4SLinus Torvalds do { 47061da177e4SLinus Torvalds hub_events(); 4707e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 47089c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 47099c8d6178Sakpm@osdl.org kthread_should_stop()); 47109c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 47111da177e4SLinus Torvalds 47121da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 47139c8d6178Sakpm@osdl.org return 0; 47141da177e4SLinus Torvalds } 47151da177e4SLinus Torvalds 47161e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 4717e6f30deaSMing Lei { .match_flags = USB_DEVICE_ID_MATCH_VENDOR 4718e6f30deaSMing Lei | USB_DEVICE_ID_MATCH_INT_CLASS, 4719e6f30deaSMing Lei .idVendor = USB_VENDOR_GENESYS_LOGIC, 4720e6f30deaSMing Lei .bInterfaceClass = USB_CLASS_HUB, 4721e6f30deaSMing Lei .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, 47221da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 47231da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 47241da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 47251da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 47261da177e4SLinus Torvalds { } /* Terminating entry */ 47271da177e4SLinus Torvalds }; 47281da177e4SLinus Torvalds 47291da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 47301da177e4SLinus Torvalds 47311da177e4SLinus Torvalds static struct usb_driver hub_driver = { 47321da177e4SLinus Torvalds .name = "hub", 47331da177e4SLinus Torvalds .probe = hub_probe, 47341da177e4SLinus Torvalds .disconnect = hub_disconnect, 47351da177e4SLinus Torvalds .suspend = hub_suspend, 47361da177e4SLinus Torvalds .resume = hub_resume, 4737f07600cfSAlan Stern .reset_resume = hub_reset_resume, 47387de18d8bSAlan Stern .pre_reset = hub_pre_reset, 47397de18d8bSAlan Stern .post_reset = hub_post_reset, 4740c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 47411da177e4SLinus Torvalds .id_table = hub_id_table, 474240f122f3SAlan Stern .supports_autosuspend = 1, 47431da177e4SLinus Torvalds }; 47441da177e4SLinus Torvalds 47451da177e4SLinus Torvalds int usb_hub_init(void) 47461da177e4SLinus Torvalds { 47471da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 47481da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 47491da177e4SLinus Torvalds usbcore_name); 47501da177e4SLinus Torvalds return -1; 47511da177e4SLinus Torvalds } 47521da177e4SLinus Torvalds 47539c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 47549c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 47551da177e4SLinus Torvalds return 0; 47561da177e4SLinus Torvalds 47571da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 47581da177e4SLinus Torvalds usb_deregister(&hub_driver); 47591da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 47601da177e4SLinus Torvalds 47611da177e4SLinus Torvalds return -1; 47621da177e4SLinus Torvalds } 47631da177e4SLinus Torvalds 47641da177e4SLinus Torvalds void usb_hub_cleanup(void) 47651da177e4SLinus Torvalds { 47669c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 47671da177e4SLinus Torvalds 47681da177e4SLinus Torvalds /* 47691da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 47701da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 47711da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 47721da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 47731da177e4SLinus Torvalds * individual hub resources. -greg 47741da177e4SLinus Torvalds */ 47751da177e4SLinus Torvalds usb_deregister(&hub_driver); 47761da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 47771da177e4SLinus Torvalds 4778eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 4779eb764c4bSAlan Stern struct usb_device_descriptor *old_device_descriptor) 47801da177e4SLinus Torvalds { 4781eb764c4bSAlan Stern int changed = 0; 47821da177e4SLinus Torvalds unsigned index; 4783eb764c4bSAlan Stern unsigned serial_len = 0; 4784eb764c4bSAlan Stern unsigned len; 4785eb764c4bSAlan Stern unsigned old_length; 4786eb764c4bSAlan Stern int length; 4787eb764c4bSAlan Stern char *buf; 47881da177e4SLinus Torvalds 4789eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 4790eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 4791eb764c4bSAlan Stern return 1; 4792eb764c4bSAlan Stern 4793eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 4794eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 4795eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 4796eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 4797eb764c4bSAlan Stern * different flash card of the same brand). 4798eb764c4bSAlan Stern */ 4799eb764c4bSAlan Stern if (udev->serial) 4800eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 4801eb764c4bSAlan Stern 4802eb764c4bSAlan Stern len = serial_len; 48031da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 4804eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 4805eb764c4bSAlan Stern len = max(len, old_length); 48061da177e4SLinus Torvalds } 4807eb764c4bSAlan Stern 48080cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 48091da177e4SLinus Torvalds if (buf == NULL) { 48101da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 48111da177e4SLinus Torvalds /* assume the worst */ 48121da177e4SLinus Torvalds return 1; 48131da177e4SLinus Torvalds } 48141da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 4815eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 48161da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 48171da177e4SLinus Torvalds old_length); 4818eb764c4bSAlan Stern if (length != old_length) { 48191da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 48201da177e4SLinus Torvalds index, length); 4821eb764c4bSAlan Stern changed = 1; 48221da177e4SLinus Torvalds break; 48231da177e4SLinus Torvalds } 48241da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 48251da177e4SLinus Torvalds != 0) { 48261da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 4827eb764c4bSAlan Stern index, 4828eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 4829eb764c4bSAlan Stern bConfigurationValue); 4830eb764c4bSAlan Stern changed = 1; 48311da177e4SLinus Torvalds break; 48321da177e4SLinus Torvalds } 48331da177e4SLinus Torvalds } 4834eb764c4bSAlan Stern 4835eb764c4bSAlan Stern if (!changed && serial_len) { 4836eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 4837eb764c4bSAlan Stern buf, serial_len); 4838eb764c4bSAlan Stern if (length + 1 != serial_len) { 4839eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 4840eb764c4bSAlan Stern length); 4841eb764c4bSAlan Stern changed = 1; 4842eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 4843eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 4844eb764c4bSAlan Stern changed = 1; 4845eb764c4bSAlan Stern } 4846eb764c4bSAlan Stern } 4847eb764c4bSAlan Stern 48481da177e4SLinus Torvalds kfree(buf); 4849eb764c4bSAlan Stern return changed; 48501da177e4SLinus Torvalds } 48511da177e4SLinus Torvalds 48521da177e4SLinus Torvalds /** 4853742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 48541da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 48551da177e4SLinus Torvalds * 485679efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 485779efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 4858742120c6SMing Lei * Use usb_reset_device() instead. 48591da177e4SLinus Torvalds * 48601da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 48611da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 48621da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 48631da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 48641da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 48651da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 48661da177e4SLinus Torvalds * re-enumerated and probed all over again. 48671da177e4SLinus Torvalds * 48681da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 48691da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 48701da177e4SLinus Torvalds * if the reset wasn't even attempted. 48711da177e4SLinus Torvalds * 48721da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 48731da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 48741da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 48751da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 48766bc6cff5SAlan Stern * 48776bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 48786bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 48796bc6cff5SAlan Stern * holding the device lock because these tasks should always call 48806bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 48811da177e4SLinus Torvalds */ 4882742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 48831da177e4SLinus Torvalds { 48841da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 48851da177e4SLinus Torvalds struct usb_hub *parent_hub; 48863f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 48871da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 488812c3da34SAlan Stern int i, ret = 0; 488912c3da34SAlan Stern int port1 = udev->portnum; 48901da177e4SLinus Torvalds 48911da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 48921da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 48931da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 48941da177e4SLinus Torvalds udev->state); 48951da177e4SLinus Torvalds return -EINVAL; 48961da177e4SLinus Torvalds } 48971da177e4SLinus Torvalds 48981da177e4SLinus Torvalds if (!parent_hdev) { 48994bec9917SWolfram Sang /* this requires hcd-specific logic; see ohci_restart() */ 4900441b62c1SHarvey Harrison dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 49011da177e4SLinus Torvalds return -EISDIR; 49021da177e4SLinus Torvalds } 49031da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 49041da177e4SLinus Torvalds 4905f74631e3SSarah Sharp /* Disable LPM and LTM while we reset the device and reinstall the alt 4906f74631e3SSarah Sharp * settings. Device-initiated LPM settings, and system exit latency 4907f74631e3SSarah Sharp * settings are cleared when the device is reset, so we have to set 4908f74631e3SSarah Sharp * them up again. 49096d1d0513SSarah Sharp */ 49106d1d0513SSarah Sharp ret = usb_unlocked_disable_lpm(udev); 49116d1d0513SSarah Sharp if (ret) { 49126d1d0513SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); 49136d1d0513SSarah Sharp goto re_enumerate; 49146d1d0513SSarah Sharp } 4915f74631e3SSarah Sharp ret = usb_disable_ltm(udev); 4916f74631e3SSarah Sharp if (ret) { 4917f74631e3SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LTM\n.", 4918f74631e3SSarah Sharp __func__); 4919f74631e3SSarah Sharp goto re_enumerate; 4920f74631e3SSarah Sharp } 49216d1d0513SSarah Sharp 49221da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 49231da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 49241da177e4SLinus Torvalds 49251da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 49261da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 4927fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 49281da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 4929dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 49301da177e4SLinus Torvalds break; 49311da177e4SLinus Torvalds } 49321da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 4933d5cbad4bSAlan Stern 49341da177e4SLinus Torvalds if (ret < 0) 49351da177e4SLinus Torvalds goto re_enumerate; 49361da177e4SLinus Torvalds 49371da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 4938eb764c4bSAlan Stern if (descriptors_changed(udev, &descriptor)) { 49391da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 49401da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 49411da177e4SLinus Torvalds goto re_enumerate; 49421da177e4SLinus Torvalds } 49431da177e4SLinus Torvalds 49444fe0387aSAlan Stern /* Restore the device's previous configuration */ 49451da177e4SLinus Torvalds if (!udev->actconfig) 49461da177e4SLinus Torvalds goto done; 49473f0479e0SSarah Sharp 4948d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 49493f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 49503f0479e0SSarah Sharp if (ret < 0) { 49513f0479e0SSarah Sharp dev_warn(&udev->dev, 49523f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 49533f0479e0SSarah Sharp "old configuration.\n"); 4954d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 49553f0479e0SSarah Sharp goto re_enumerate; 49563f0479e0SSarah Sharp } 49571da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 49581da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 49591da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 49601da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 49611da177e4SLinus Torvalds if (ret < 0) { 49621da177e4SLinus Torvalds dev_err(&udev->dev, 49631da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 49641da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 4965d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 49661da177e4SLinus Torvalds goto re_enumerate; 49671da177e4SLinus Torvalds } 4968d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 49691da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 49701da177e4SLinus Torvalds 49714fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 49724fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 49734fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 49744fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 49754fe0387aSAlan Stern * endpoint state. 49764fe0387aSAlan Stern */ 49771da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 49783f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 49793f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 49801da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 49811da177e4SLinus Torvalds 49821da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 49834fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 49844fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 49854fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 49864fe0387aSAlan Stern ret = 0; 49874fe0387aSAlan Stern } else { 498804a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 498904a723eaSSarah Sharp * device has been reset, and it will have to use 499004a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 49913f0479e0SSarah Sharp */ 499204a723eaSSarah Sharp intf->resetting_device = 1; 49931da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 49941da177e4SLinus Torvalds desc->bAlternateSetting); 499504a723eaSSarah Sharp intf->resetting_device = 0; 49964fe0387aSAlan Stern } 49971da177e4SLinus Torvalds if (ret < 0) { 49981da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 49991da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 50001da177e4SLinus Torvalds desc->bInterfaceNumber, 50011da177e4SLinus Torvalds desc->bAlternateSetting, 50021da177e4SLinus Torvalds ret); 50031da177e4SLinus Torvalds goto re_enumerate; 50041da177e4SLinus Torvalds } 50051da177e4SLinus Torvalds } 50061da177e4SLinus Torvalds 50071da177e4SLinus Torvalds done: 5008f74631e3SSarah Sharp /* Now that the alt settings are re-installed, enable LTM and LPM. */ 500978d9a487SAlan Stern usb_unlocked_enable_lpm(udev); 5010f74631e3SSarah Sharp usb_enable_ltm(udev); 50111da177e4SLinus Torvalds return 0; 50121da177e4SLinus Torvalds 50131da177e4SLinus Torvalds re_enumerate: 50146d1d0513SSarah Sharp /* LPM state doesn't matter when we're about to destroy the device. */ 50151da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 50161da177e4SLinus Torvalds return -ENODEV; 50171da177e4SLinus Torvalds } 50181da177e4SLinus Torvalds 50191da177e4SLinus Torvalds /** 50201da177e4SLinus Torvalds * usb_reset_device - warn interface drivers and perform a USB port reset 50211da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 50221da177e4SLinus Torvalds * 502379efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 502479efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 5025742120c6SMing Lei * the reset is over (using their post_reset method). 502679efa097SAlan Stern * 502779efa097SAlan Stern * Return value is the same as for usb_reset_and_verify_device(). 502879efa097SAlan Stern * 502979efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 503079efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 503179efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 5032742120c6SMing Lei * the device using usb_lock_device_for_reset(). 503379efa097SAlan Stern * 503479efa097SAlan Stern * If an interface is currently being probed or disconnected, we assume 503579efa097SAlan Stern * its driver knows how to handle resets. For all other interfaces, 503679efa097SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 503779efa097SAlan Stern * we attempt to unbind it and rebind afterward. 503879efa097SAlan Stern */ 5039742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 504079efa097SAlan Stern { 504179efa097SAlan Stern int ret; 5042852c4b43SAlan Stern int i; 504379efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 504479efa097SAlan Stern 504579efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 504679efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 504779efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 504879efa097SAlan Stern udev->state); 504979efa097SAlan Stern return -EINVAL; 505079efa097SAlan Stern } 505179efa097SAlan Stern 5052645daaabSAlan Stern /* Prevent autosuspend during the reset */ 505394fcda1fSAlan Stern usb_autoresume_device(udev); 5054645daaabSAlan Stern 505579efa097SAlan Stern if (config) { 5056852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 5057852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 505879efa097SAlan Stern struct usb_driver *drv; 505978d9a487SAlan Stern int unbind = 0; 506079efa097SAlan Stern 5061852c4b43SAlan Stern if (cintf->dev.driver) { 506279efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 506378d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 506478d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 506578d9a487SAlan Stern else if (cintf->condition == 506678d9a487SAlan Stern USB_INTERFACE_BOUND) 506778d9a487SAlan Stern unbind = 1; 506878d9a487SAlan Stern if (unbind) 506978d9a487SAlan Stern usb_forced_unbind_intf(cintf); 507079efa097SAlan Stern } 507179efa097SAlan Stern } 507279efa097SAlan Stern } 507379efa097SAlan Stern 5074742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 507579efa097SAlan Stern 507679efa097SAlan Stern if (config) { 5077852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 5078852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 507979efa097SAlan Stern struct usb_driver *drv; 508078d9a487SAlan Stern int rebind = cintf->needs_binding; 508179efa097SAlan Stern 508278d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 508379efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 508479efa097SAlan Stern if (drv->post_reset) 508578d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 508678d9a487SAlan Stern else if (cintf->condition == 508778d9a487SAlan Stern USB_INTERFACE_BOUND) 508878d9a487SAlan Stern rebind = 1; 508979efa097SAlan Stern } 50906c640945SAlan Stern if (ret == 0 && rebind) 509178d9a487SAlan Stern usb_rebind_intf(cintf); 509279efa097SAlan Stern } 509379efa097SAlan Stern } 509479efa097SAlan Stern 509594fcda1fSAlan Stern usb_autosuspend_device(udev); 509679efa097SAlan Stern return ret; 509779efa097SAlan Stern } 5098742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 5099dc023dceSInaky Perez-Gonzalez 5100dc023dceSInaky Perez-Gonzalez 5101dc023dceSInaky Perez-Gonzalez /** 5102dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 5103dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 5104dc023dceSInaky Perez-Gonzalez * 5105dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 5106dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 5107dc023dceSInaky Perez-Gonzalez * 5108dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 5109dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 5110dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 5111dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 5112dc023dceSInaky Perez-Gonzalez * 5113dc023dceSInaky Perez-Gonzalez * Corner cases: 5114dc023dceSInaky Perez-Gonzalez * 5115dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 5116dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 5117dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 5118dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 5119dc023dceSInaky Perez-Gonzalez * 5120dc023dceSInaky Perez-Gonzalez * - If a driver is unbound and it had a pending reset, the reset will 5121dc023dceSInaky Perez-Gonzalez * be cancelled. 5122dc023dceSInaky Perez-Gonzalez * 5123dc023dceSInaky Perez-Gonzalez * - This function can be called during .probe() or .disconnect() 5124dc023dceSInaky Perez-Gonzalez * times. On return from .disconnect(), any pending resets will be 5125dc023dceSInaky Perez-Gonzalez * cancelled. 5126dc023dceSInaky Perez-Gonzalez * 5127dc023dceSInaky Perez-Gonzalez * There is no no need to lock/unlock the @reset_ws as schedule_work() 5128dc023dceSInaky Perez-Gonzalez * does its own. 5129dc023dceSInaky Perez-Gonzalez * 5130dc023dceSInaky Perez-Gonzalez * NOTE: We don't do any reference count tracking because it is not 5131dc023dceSInaky Perez-Gonzalez * needed. The lifecycle of the work_struct is tied to the 5132dc023dceSInaky Perez-Gonzalez * usb_interface. Before destroying the interface we cancel the 5133dc023dceSInaky Perez-Gonzalez * work_struct, so the fact that work_struct is queued and or 5134dc023dceSInaky Perez-Gonzalez * running means the interface (and thus, the device) exist and 5135dc023dceSInaky Perez-Gonzalez * are referenced. 5136dc023dceSInaky Perez-Gonzalez */ 5137dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 5138dc023dceSInaky Perez-Gonzalez { 5139dc023dceSInaky Perez-Gonzalez schedule_work(&iface->reset_ws); 5140dc023dceSInaky Perez-Gonzalez } 5141dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 5142ff823c79SLan Tianyu 5143ff823c79SLan Tianyu /** 5144ff823c79SLan Tianyu * usb_hub_find_child - Get the pointer of child device 5145ff823c79SLan Tianyu * attached to the port which is specified by @port1. 5146ff823c79SLan Tianyu * @hdev: USB device belonging to the usb hub 5147ff823c79SLan Tianyu * @port1: port num to indicate which port the child device 5148ff823c79SLan Tianyu * is attached to. 5149ff823c79SLan Tianyu * 5150ff823c79SLan Tianyu * USB drivers call this function to get hub's child device 5151ff823c79SLan Tianyu * pointer. 5152ff823c79SLan Tianyu * 5153ff823c79SLan Tianyu * Return NULL if input param is invalid and 5154ff823c79SLan Tianyu * child's usb_device pointer if non-NULL. 5155ff823c79SLan Tianyu */ 5156ff823c79SLan Tianyu struct usb_device *usb_hub_find_child(struct usb_device *hdev, 5157ff823c79SLan Tianyu int port1) 5158ff823c79SLan Tianyu { 5159ff823c79SLan Tianyu struct usb_hub *hub = hdev_to_hub(hdev); 5160ff823c79SLan Tianyu 5161ff823c79SLan Tianyu if (port1 < 1 || port1 > hdev->maxchild) 5162ff823c79SLan Tianyu return NULL; 5163ff823c79SLan Tianyu return hub->ports[port1 - 1]->child; 5164ff823c79SLan Tianyu } 5165ff823c79SLan Tianyu EXPORT_SYMBOL_GPL(usb_hub_find_child); 5166d5575424SLan Tianyu 516705f91689SLan Tianyu /** 516805f91689SLan Tianyu * usb_set_hub_port_connect_type - set hub port connect type. 516905f91689SLan Tianyu * @hdev: USB device belonging to the usb hub 517005f91689SLan Tianyu * @port1: port num of the port 517105f91689SLan Tianyu * @type: connect type of the port 517205f91689SLan Tianyu */ 517305f91689SLan Tianyu void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1, 517405f91689SLan Tianyu enum usb_port_connect_type type) 517505f91689SLan Tianyu { 517605f91689SLan Tianyu struct usb_hub *hub = hdev_to_hub(hdev); 517705f91689SLan Tianyu 517805f91689SLan Tianyu hub->ports[port1 - 1]->connect_type = type; 517905f91689SLan Tianyu } 518005f91689SLan Tianyu 518105f91689SLan Tianyu /** 518205f91689SLan Tianyu * usb_get_hub_port_connect_type - Get the port's connect type 518305f91689SLan Tianyu * @hdev: USB device belonging to the usb hub 518405f91689SLan Tianyu * @port1: port num of the port 518505f91689SLan Tianyu * 518605f91689SLan Tianyu * Return connect type of the port and if input params are 518705f91689SLan Tianyu * invalid, return USB_PORT_CONNECT_TYPE_UNKNOWN. 518805f91689SLan Tianyu */ 518905f91689SLan Tianyu enum usb_port_connect_type 519005f91689SLan Tianyu usb_get_hub_port_connect_type(struct usb_device *hdev, int port1) 519105f91689SLan Tianyu { 519205f91689SLan Tianyu struct usb_hub *hub = hdev_to_hub(hdev); 519305f91689SLan Tianyu 519405f91689SLan Tianyu return hub->ports[port1 - 1]->connect_type; 519505f91689SLan Tianyu } 519605f91689SLan Tianyu 5197d5575424SLan Tianyu #ifdef CONFIG_ACPI 5198d5575424SLan Tianyu /** 5199d5575424SLan Tianyu * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle 5200d5575424SLan Tianyu * @hdev: USB device belonging to the usb hub 5201d5575424SLan Tianyu * @port1: port num of the port 5202d5575424SLan Tianyu * 5203d5575424SLan Tianyu * Return port's acpi handle if successful, NULL if params are 5204d5575424SLan Tianyu * invaild. 5205d5575424SLan Tianyu */ 5206d5575424SLan Tianyu acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, 5207d5575424SLan Tianyu int port1) 5208d5575424SLan Tianyu { 5209d5575424SLan Tianyu struct usb_hub *hub = hdev_to_hub(hdev); 5210d5575424SLan Tianyu 5211d5575424SLan Tianyu return DEVICE_ACPI_HANDLE(&hub->ports[port1 - 1]->dev); 5212d5575424SLan Tianyu } 5213d5575424SLan Tianyu #endif 5214