#include "hcd.h"
#include "hub.h"
-/* Protect all struct usb_device state members */
+/* Protect struct usb_device state and children members */
static spinlock_t device_state_lock = SPIN_LOCK_UNLOCKED;
/* Wakes up khubd */
unsigned changed = 0;
int cursor = -1;
- if (hdev->state != USB_STATE_CONFIGURED)
+ if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
return;
for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
spin_unlock(&hub_event_lock);
resubmit:
+ if (hub->quiescing)
+ return;
+
if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
&& status != -ENODEV && status != -EPERM)
dev_err (&hub->intf->dev, "resubmit --> %d\n", status);
static unsigned highspeed_hubs;
+static void hub_quiesce(struct usb_hub *hub)
+{
+ /* stop khubd and related activity */
+ hub->quiescing = 1;
+ usb_kill_urb(hub->urb);
+ if (hub->has_indicators)
+ cancel_delayed_work(&hub->leds);
+ if (hub->has_indicators || hub->tt.hub)
+ flush_scheduled_work();
+}
+
+#ifdef CONFIG_USB_SUSPEND
+
+static void hub_reactivate(struct usb_hub *hub)
+{
+ int status;
+
+ hub->quiescing = 0;
+ status = usb_submit_urb(hub->urb, GFP_NOIO);
+ if (status < 0)
+ dev_err(&hub->intf->dev, "reactivate --> %d\n", status);
+ if (hub->has_indicators && blinkenlights)
+ schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
+}
+
+#endif
+
static void hub_disconnect(struct usb_interface *intf)
{
struct usb_hub *hub = usb_get_intfdata (intf);
usb_set_intfdata (intf, NULL);
- if (hub->urb) {
- usb_kill_urb(hub->urb);
- usb_free_urb(hub->urb);
- hub->urb = NULL;
- }
+ hub_quiesce(hub);
+ usb_free_urb(hub->urb);
+ hub->urb = NULL;
spin_lock_irq(&hub_event_lock);
list_del_init(&hub->event_list);
spin_unlock_irq(&hub_event_lock);
- /* assuming we used keventd, it must quiesce too */
- if (hub->has_indicators)
- cancel_delayed_work (&hub->leds);
- if (hub->has_indicators || hub->tt.hub)
- flush_scheduled_work ();
-
if (hub->descriptor) {
kfree(hub->descriptor);
hub->descriptor = NULL;
}
}
+/* caller has locked the hub and must own the device lock */
static int hub_reset(struct usb_hub *hub)
{
struct usb_device *hdev = hub->hdev;
else
return -1;
- if (usb_reset_device(hdev))
+ if (__usb_reset_device(hdev))
return -1;
hub->urb->dev = hdev;
return 0;
}
+/* caller has locked the hub */
/* FIXME! This routine should be subsumed into hub_reset */
static void hub_start_disconnect(struct usb_device *hdev)
{
udev->state = USB_STATE_NOTATTACHED;
}
+/* grab device/port lock, returning index of that port (zero based).
+ * protects the upstream link used by this device from concurrent
+ * tree operations like suspend, resume, reset, and disconnect, which
+ * apply to everything downstream of a given port.
+ */
+static int locktree(struct usb_device *udev)
+{
+ int t;
+ struct usb_device *hdev;
+
+ if (!udev)
+ return -ENODEV;
+
+ /* root hub is always the first lock in the series */
+ hdev = udev->parent;
+ if (!hdev) {
+ down(&udev->serialize);
+ return 0;
+ }
+
+ /* on the path from root to us, lock everything from
+ * top down, dropping parent locks when not needed
+ *
+ * NOTE: if disconnect were to ignore the locking, we'd need
+ * to get extra refcounts to everything since hdev->children
+ * and udev->parent could be invalidated while we work...
+ */
+ t = locktree(hdev);
+ if (t < 0)
+ return t;
+ spin_lock_irq(&device_state_lock);
+ for (t = 0; t < hdev->maxchild; t++) {
+ if (hdev->children[t] == udev) {
+ /* everything is fail-fast once disconnect
+ * processing starts
+ */
+ if (udev->state == USB_STATE_NOTATTACHED)
+ break;
+
+ /* when everyone grabs locks top->bottom,
+ * non-overlapping work may be concurrent
+ */
+ spin_unlock_irq(&device_state_lock);
+ down(&udev->serialize);
+ up(&hdev->serialize);
+ return t;
+ }
+ }
+ spin_unlock_irq(&device_state_lock);
+ up(&hdev->serialize);
+ return -ENODEV;
+}
+
/**
* usb_set_device_state - change a device's current state (usbcore-internal)
* @udev: pointer to device whose state should be changed
* @new_state: new state value to be stored
*
- * udev->state is _not_ protected by the udev->serialize semaphore. This
+ * udev->state is _not_ protected by the device lock. This
* is so that devices can be marked as disconnected as soon as possible,
* without having to wait for the semaphore to be released. Instead,
* changes to the state must be protected by the device_state_lock spinlock.
/**
* usb_disconnect - disconnect a device (usbcore-internal)
- * @pdev: pointer to device being disconnected
+ * @pdev: pointer to device being disconnected, into a locked hub
* Context: !in_interrupt ()
*
* Something got disconnected. Get rid of it, and all of its children.
}
/* mark the device as inactive, so any further urb submissions for
- * this device will fail.
+ * this device (and any of its children) will fail immediately.
+ * this quiesces everyting except pending urbs.
*/
usb_set_device_state(udev, USB_STATE_NOTATTACHED);
/* deallocate hcd/hardware state ... nuking all pending urbs and
* cleaning up all state associated with the current configuration
+ * so that the hardware is now fully quiesced.
*/
usb_disable_device(udev, 0);
usbfs_remove_device(udev);
usb_remove_sysfs_dev_files(udev);
- /* Avoid races with recursively_mark_NOTATTACHED() */
+ /* Avoid races with recursively_mark_NOTATTACHED() and locktree() */
spin_lock_irq(&device_state_lock);
*pdev = NULL;
spin_unlock_irq(&device_state_lock);
{}
#endif
+#ifdef CONFIG_USB_OTG
+#include "otg_whitelist.h"
+#endif
+
/**
* usb_new_device - perform initial device setup (usbcore-internal)
* @udev: newly addressed device (in ADDRESS state)
show_string(udev, "SerialNumber",
udev->descriptor.iSerialNumber);
+#ifdef CONFIG_USB_OTG
+ /*
+ * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
+ * to wake us after we've powered off VBUS; and HNP, switching roles
+ * "host" to "peripheral". The OTG descriptor helps figure this out.
+ */
+ if (!udev->bus->is_b_host
+ && udev->config
+ && udev->parent == udev->bus->root_hub) {
+ struct usb_otg_descriptor *desc = 0;
+ struct usb_bus *bus = udev->bus;
+
+ /* descriptor may appear anywhere in config */
+ if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
+ udev->config[0].desc.wTotalLength,
+ USB_DT_OTG, (void **) &desc) == 0) {
+ if (desc->bmAttributes & USB_OTG_HNP) {
+ unsigned port;
+ struct usb_device *root = udev->parent;
+
+ for (port = 0; port < root->maxchild; port++) {
+ if (root->children[port] == udev)
+ break;
+ }
+ port++;
+
+ dev_info(&udev->dev,
+ "Dual-Role OTG device on %sHNP port\n",
+ (port == bus->otg_port)
+ ? "" : "non-");
+
+ /* enable HNP before suspend, it's simpler */
+ if (port == bus->otg_port)
+ bus->b_hnp_enable = 1;
+ err = usb_control_msg(udev,
+ usb_sndctrlpipe(udev, 0),
+ USB_REQ_SET_FEATURE, 0,
+ bus->b_hnp_enable
+ ? USB_DEVICE_B_HNP_ENABLE
+ : USB_DEVICE_A_ALT_HNP_SUPPORT,
+ 0, NULL, 0, HZ * USB_CTRL_SET_TIMEOUT);
+ if (err < 0) {
+ /* OTG MESSAGE: report errors here,
+ * customize to match your product.
+ */
+ dev_info(&udev->dev,
+ "can't set HNP mode; %d\n",
+ err);
+ bus->b_hnp_enable = 0;
+ }
+ }
+ }
+ }
+
+ if (!is_targeted(udev)) {
+
+ /* Maybe it can talk to us, though we can't talk to it.
+ * (Includes HNP test device.)
+ */
+ if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
+ static int __usb_suspend_device (struct usb_device *,
+ int port, u32 state);
+ err = __usb_suspend_device(udev,
+ udev->bus->otg_port - 1,
+ PM_SUSPEND_MEM);
+ if (err < 0)
+ dev_dbg(&udev->dev, "HNP fail, %d\n", err);
+ }
+ err = -ENODEV;
+ goto fail;
+ }
+#endif
+
/* put device-specific files into sysfs */
err = device_add (&udev->dev);
if (err) {
if (status == -ENOTCONN || status == 0) {
clear_port_feature(hdev,
port + 1, USB_PORT_FEAT_C_RESET);
+ /* FIXME need disconnect() for NOTATTACHED device */
usb_set_device_state(udev, status
? USB_STATE_NOTATTACHED
: USB_STATE_DEFAULT);
{
int ret;
- if (hdev->children[port])
+ if (hdev->children[port]) {
+ /* FIXME need disconnect() for NOTATTACHED device */
usb_set_device_state(hdev->children[port],
USB_STATE_NOTATTACHED);
+ }
ret = clear_port_feature(hdev, port + 1, USB_PORT_FEAT_ENABLE);
if (ret)
dev_err(hubdev(hdev), "cannot disable port %d (err = %d)\n",
#ifdef CONFIG_USB_SUSPEND
- /* no USB_SUSPEND yet! */
+/*
+ * Selective port suspend reduces power; most suspended devices draw
+ * less than 500 uA. It's also used in OTG, along with remote wakeup.
+ * All devices below the suspended port are also suspended.
+ *
+ * Devices leave suspend state when the host wakes them up. Some devices
+ * also support "remote wakeup", where the device can activate the USB
+ * tree above them to deliver data, such as a keypress or packet. In
+ * some cases, this wakes the USB host.
+ */
+static int hub_port_suspend(struct usb_device *hdev, int port)
+{
+ int status;
+ struct usb_device *udev;
+
+ udev = hdev->children[port - 1];
+ // dev_dbg(hubdev(hdev), "suspend port %d\n", port);
+
+ /* enable remote wakeup when appropriate; this lets the device
+ * wake up the upstream hub (including maybe the root hub).
+ *
+ * NOTE: OTG devices may issue remote wakeup (or SRP) even when
+ * we don't explicitly enable it here.
+ */
+ if (udev->actconfig
+ // && FIXME (remote wakeup enabled on this bus)
+ // ... currently assuming it's always appropriate
+ && (udev->actconfig->desc.bmAttributes
+ & USB_CONFIG_ATT_WAKEUP) != 0) {
+ status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
+ USB_DEVICE_REMOTE_WAKEUP, 0,
+ NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+ if (status)
+ dev_dbg(&udev->dev,
+ "won't remote wakeup, status %d\n",
+ status);
+ }
+
+ /* see 7.1.7.6 */
+ status = set_port_feature(hdev, port, USB_PORT_FEAT_SUSPEND);
+ if (status) {
+ dev_dbg(hubdev(hdev),
+ "can't suspend port %d, status %d\n",
+ port, status);
+ /* paranoia: "should not happen" */
+ (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
+ USB_DEVICE_REMOTE_WAKEUP, 0,
+ NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+ } else {
+ /* device has up to 10 msec to fully suspend */
+ dev_dbg(&udev->dev, "usb suspend\n");
+ udev->state = USB_STATE_SUSPENDED;
+ msleep(10);
+ }
+ return status;
+}
+
+/*
+ * Devices on USB hub ports have only one "suspend" state, corresponding
+ * to ACPI D2 (PM_SUSPEND_MEM), "may cause the device to lose some context".
+ * State transitions include:
+ *
+ * - suspend, resume ... when the VBUS power link stays live
+ * - suspend, disconnect ... VBUS lost
+ *
+ * Once VBUS drop breaks the circuit, the port it's using has to go through
+ * normal re-enumeration procedures, starting with enabling VBUS power.
+ * Other than re-initializing the hub (plug/unplug, except for root hubs),
+ * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
+ * timer, no SRP, no requests through sysfs.
+ */
+static int __usb_suspend_device (struct usb_device *udev, int port, u32 state)
+{
+ int status;
+
+ if (port < 0)
+ return port;
+
+ /* NOTE: udev->serialize released on all real returns! */
+
+ if (state <= udev->dev.power.power_state
+ || state < PM_SUSPEND_MEM
+ || udev->state == USB_STATE_SUSPENDED
+ || udev->state == USB_STATE_NOTATTACHED) {
+ up(&udev->serialize);
+ return 0;
+ }
+
+ /* suspend interface drivers; if this is a hub, it
+ * suspends the child devices
+ */
+ if (udev->actconfig) {
+ int i;
+
+ for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
+ struct usb_interface *intf;
+ struct usb_driver *driver;
+
+ intf = udev->actconfig->interface[i];
+ if (state <= intf->dev.power.power_state)
+ continue;
+ if (!intf->dev.driver)
+ continue;
+ driver = to_usb_driver(intf->dev.driver);
+
+ if (driver->suspend) {
+ status = driver->suspend(intf, state);
+ if (intf->dev.power.power_state != state
+ || status)
+ dev_err(&intf->dev,
+ "suspend %d fail, code %d\n",
+ state, status);
+ }
+
+ /* only drivers with suspend() can ever resume();
+ * and after power loss, even they won't.
+ * bus_rescan_devices() can rebind drivers later.
+ *
+ * FIXME the PM core self-deadlocks when unbinding
+ * drivers during suspend/resume ... everything grabs
+ * dpm_sem (not a spinlock, ugh). we want to unbind,
+ * since we know every driver's probe/disconnect works
+ * even for drivers that can't suspend.
+ */
+ if (!driver->suspend || state > PM_SUSPEND_MEM) {
+#if 1
+ dev_warn(&intf->dev, "resume is unsafe!\n");
+#else
+ down_write(&usb_bus_type.rwsem);
+ device_release_driver(&intf->dev);
+ up_write(&usb_bus_type.rwsem);
+#endif
+ }
+ }
+ }
+
+ /*
+ * FIXME this needs port power off call paths too, to help force
+ * USB into the "generic" PM model. At least for devices on
+ * ports that aren't using ganged switching (usually root hubs).
+ *
+ * NOTE: SRP-capable links should adopt more aggressive poweroff
+ * policies (when HNP doesn't apply) once we have mechanisms to
+ * turn power back on! (Likely not before 2.7...)
+ */
+ if (state > PM_SUSPEND_MEM) {
+ dev_warn(&udev->dev, "no poweroff yet, suspending instead\n");
+ state = PM_SUSPEND_MEM;
+ }
+
+ /* "global suspend" of the HC-to-USB interface (root hub), or
+ * "selective suspend" of just one hub-device link.
+ */
+ if (!udev->parent) {
+ struct usb_bus *bus = udev->bus;
+ if (bus && bus->op->hub_suspend)
+ status = bus->op->hub_suspend (bus);
+ else
+ status = -EOPNOTSUPP;
+ } else
+ status = hub_port_suspend(udev->parent, port + 1);
+
+ if (status == 0)
+ udev->dev.power.power_state = state;
+ up(&udev->serialize);
+ return status;
+}
+
+/**
+ * usb_suspend_device - suspend a usb device
+ * @udev: device that's no longer in active use
+ * @state: PM_SUSPEND_MEM to suspend
+ * Context: must be able to sleep; device not locked
+ *
+ * Suspends a USB device that isn't in active use, conserving power.
+ * Devices may wake out of a suspend, if anything important happens,
+ * using the remote wakeup mechanism. They may also be taken out of
+ * suspend by the host, using usb_resume_device(). It's also routine
+ * to disconnect devices while they are suspended.
+ *
+ * Suspending OTG devices may trigger HNP, if that's been enabled
+ * between a pair of dual-role devices. That will change roles, such
+ * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
+ *
+ * Returns 0 on success, else negative errno.
+ */
+int usb_suspend_device(struct usb_device *udev, u32 state)
+{
+ return __usb_suspend_device(udev, locktree(udev), state);
+}
+
+/*
+ * hardware resume signaling is finished, either because of selective
+ * resume (by host) or remote wakeup (by device) ... now see what changed
+ * in the tree that's rooted at this device.
+ */
+static int finish_port_resume(struct usb_device *udev)
+{
+ int status;
+ u16 devstatus;
+
+ /* caller owns udev->serialize */
+ dev_dbg(&udev->dev, "usb resume\n");
+ udev->dev.power.power_state = PM_SUSPEND_ON;
+
+ /* usb ch9 identifies four variants of SUSPENDED, based on what
+ * state the device resumes to. Linux currently won't see the
+ * first two on the host side; they'd be inside hub_port_init()
+ * during many timeouts, but khubd can't suspend until later.
+ */
+ udev->state = udev->actconfig
+ ? USB_STATE_CONFIGURED
+ : USB_STATE_ADDRESS;
+
+ /* 10.5.4.5 says be sure devices in the tree are still there.
+ * For now let's assume the device didn't go crazy on resume,
+ * and device drivers will know about any resume quirks.
+ */
+ status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
+ if (status < 0)
+ dev_dbg(&udev->dev,
+ "gone after usb resume? status %d\n",
+ status);
+ else if (udev->actconfig) {
+ unsigned i;
+
+ le16_to_cpus(&devstatus);
+ if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
+ status = usb_control_msg(udev,
+ usb_sndctrlpipe(udev, 0),
+ USB_REQ_CLEAR_FEATURE,
+ USB_RECIP_DEVICE,
+ USB_DEVICE_REMOTE_WAKEUP, 0,
+ NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+ if (status) {
+ dev_dbg(&udev->dev, "disable remote "
+ "wakeup, status %d\n", status);
+ status = 0;
+ }
+ }
+
+ /* resume interface drivers; if this is a hub, it
+ * resumes the child devices
+ */
+ for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
+ struct usb_interface *intf;
+ struct usb_driver *driver;
+
+ intf = udev->actconfig->interface[i];
+ if (intf->dev.power.power_state == PM_SUSPEND_ON)
+ continue;
+ if (!intf->dev.driver) {
+ /* FIXME maybe force to alt 0 */
+ continue;
+ }
+ driver = to_usb_driver(intf->dev.driver);
+
+ /* bus_rescan_devices() may rebind drivers */
+ if (!driver->resume)
+ continue;
+
+ /* can we do better than just logging errors? */
+ status = driver->resume(intf);
+ if (intf->dev.power.power_state != PM_SUSPEND_ON
+ || status)
+ dev_dbg(&intf->dev,
+ "resume fail, state %d code %d\n",
+ intf->dev.power.power_state, status);
+ }
+ status = 0;
+
+ } else if (udev->devnum <= 0) {
+ dev_dbg(&udev->dev, "bogus resume!\n");
+ status = -EINVAL;
+ }
+ return status;
+}
+
+static int
+hub_port_resume(struct usb_device *hdev, int port)
+{
+ int status;
+ struct usb_device *udev;
+
+ udev = hdev->children[port - 1];
+ // dev_dbg(hubdev(hdev), "resume port %d\n", port);
+
+ /* see 7.1.7.7; affects power usage, but not budgeting */
+ status = clear_port_feature(hdev, port, USB_PORT_FEAT_SUSPEND);
+ if (status) {
+ dev_dbg(&hdev->actconfig->interface[0]->dev,
+ "can't resume port %d, status %d\n",
+ port, status);
+ } else {
+ u16 devstatus;
+ u16 portchange;
+
+ /* drive resume for at least 20 msec */
+ dev_dbg(&udev->dev, "RESUME\n");
+ msleep(25);
+
+#define LIVE_FLAGS ( USB_PORT_STAT_POWER \
+ | USB_PORT_STAT_ENABLE \
+ | USB_PORT_STAT_CONNECTION)
+
+ /* Virtual root hubs can trigger on GET_PORT_STATUS to
+ * stop resume signaling. Then finish the resume
+ * sequence.
+ */
+ devstatus = portchange = 0;
+ status = hub_port_status(hdev, port - 1,
+ &devstatus, &portchange);
+ if (status < 0
+ || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
+ || (devstatus & USB_PORT_STAT_SUSPEND) != 0
+ ) {
+ dev_dbg(&hdev->actconfig->interface[0]->dev,
+ "port %d status %04x.%04x after resume, %d\n",
+ port, portchange, devstatus, status);
+ } else {
+ /* TRSMRCY = 10 msec */
+ msleep(10);
+ status = finish_port_resume(udev);
+ }
+ }
+ if (status < 0)
+ status = hub_port_disable(hdev, port);
+
+ return status;
+}
+
+static int hub_resume (struct usb_interface *intf);
+
+/**
+ * usb_resume_device - re-activate a suspended usb device
+ * @udev: device to re-activate
+ * Context: must be able to sleep; device not locked
+ *
+ * This will re-activate the suspended device, increasing power usage
+ * while letting drivers communicate again with its endpoints.
+ * USB resume explicitly guarantees that the power session between
+ * the host and the device is the same as it was when the device
+ * suspended.
+ *
+ * Returns 0 on success, else negative errno.
+ */
+int usb_resume_device(struct usb_device *udev)
+{
+ int port, status;
+
+ port = locktree(udev);
+ if (port < 0)
+ return port;
+
+ /* "global resume" of the HC-to-USB interface (root hub), or
+ * selective resume of one hub-to-device port
+ */
+ if (!udev->parent) {
+ struct usb_bus *bus = udev->bus;
+ if (bus && bus->op->hub_resume)
+ status = bus->op->hub_resume (bus);
+ else
+ status = -EOPNOTSUPP;
+ if (status == 0) {
+ /* TRSMRCY = 10 msec */
+ msleep(10);
+ status = hub_resume (bus->root_hub
+ ->actconfig->interface[0]);
+ }
+ } else if (udev->state == USB_STATE_SUSPENDED) {
+ status = hub_port_resume(udev->parent, port + 1);
+ } else {
+ status = 0;
+ udev->dev.power.power_state = PM_SUSPEND_ON;
+ }
+ if (status < 0) {
+ dev_dbg(&udev->dev, "can't resume, status %d\n",
+ status);
+ }
+
+ up(&udev->serialize);
+
+ /* rebind drivers that had no suspend() */
+ bus_rescan_devices(&usb_bus_type);
+
+ return status;
+}
+
+static int remote_wakeup(struct usb_device *udev)
+{
+ int status = 0;
+
+ /* don't repeat RESUME sequence if this device
+ * was already woken up by some other task
+ */
+ down(&udev->serialize);
+ if (udev->state == USB_STATE_SUSPENDED) {
+ dev_dbg(&udev->dev, "RESUME (wakeup)\n");
+ /* TRSMRCY = 10 msec */
+ msleep(10);
+ status = finish_port_resume(udev);
+ }
+ up(&udev->serialize);
+ return status;
+}
+
+static int hub_suspend(struct usb_interface *intf, u32 state)
+{
+ struct usb_hub *hub = usb_get_intfdata (intf);
+ struct usb_device *hdev = hub->hdev;
+ unsigned port;
+ int status;
+
+ /* stop khubd and related activity */
+ hub_quiesce(hub);
+
+ /* then suspend every port */
+ for (port = 0; port < hdev->maxchild; port++) {
+ struct usb_device *udev;
+
+ udev = hdev->children [port];
+ if (!udev)
+ continue;
+ down(&udev->serialize);
+ status = __usb_suspend_device(udev, port, state);
+ if (status < 0)
+ dev_dbg(&intf->dev, "suspend port %d --> %d\n",
+ port, status);
+ }
+
+ intf->dev.power.power_state = state;
+ return 0;
+}
+
+static int hub_resume(struct usb_interface *intf)
+{
+ struct usb_device *hdev = interface_to_usbdev(intf);
+ struct usb_hub *hub = usb_get_intfdata (intf);
+ unsigned port;
+ int status;
+
+ for (port = 0; port < hdev->maxchild; port++) {
+ struct usb_device *udev;
+ u16 portstat, portchange;
+
+ udev = hdev->children [port];
+ status = hub_port_status(hdev, port, &portstat, &portchange);
+ if (status == 0) {
+ if (portchange & USB_PORT_STAT_C_SUSPEND) {
+ clear_port_feature(hdev, port + 1,
+ USB_PORT_FEAT_C_SUSPEND);
+ portchange &= ~USB_PORT_STAT_C_SUSPEND;
+ }
+
+ /* let khubd handle disconnects etc */
+ if (portchange)
+ continue;
+ }
+
+ if (!udev)
+ continue;
+ down (&udev->serialize);
+ if (portstat & USB_PORT_STAT_SUSPEND)
+ status = hub_port_resume(hdev, port + 1);
+ else {
+ status = finish_port_resume(udev);
+ if (status < 0)
+ status = hub_port_disable(hdev, port);
+ if (status < 0)
+ dev_dbg(&intf->dev, "resume port %d --> %d\n",
+ port, status);
+ }
+ up(&udev->serialize);
+ }
+ intf->dev.power.power_state = PM_SUSPEND_ON;
+
+ hub_reactivate(hub);
+ return 0;
+}
#else /* !CONFIG_USB_SUSPEND */
hdev->bus->b_hnp_enable = 0;
}
+ retval = clear_port_feature(hdev, port, USB_PORT_FEAT_SUSPEND);
+ if (retval < 0 && retval != -EPIPE)
+ dev_dbg(&udev->dev, "can't clear suspend; %d\n", retval);
+
/* Some low speed devices have problems with the quick delay, so */
/* be a bit pessimistic with those devices. RHbug #23670 */
if (oldspeed == USB_SPEED_LOW)
!= udev->descriptor.bMaxPacketSize0)) {
usb_disable_endpoint(udev, 0 + USB_DIR_IN);
usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
- usb_endpoint_running(udev, 0, 1);
- usb_endpoint_running(udev, 0, 0);
udev->epmaxpacketin [0] = udev->descriptor.bMaxPacketSize0;
udev->epmaxpacketout[0] = udev->descriptor.bMaxPacketSize0;
}
* a port enable-change occurs (often caused by EMI);
* usb_reset_device() encounters changed descriptors (as from
* a firmware download)
+ * caller already locked the hub
*/
static void hub_port_connect_change(struct usb_hub *hub, int port,
u16 portstatus, u16 portchange)
usb_disconnect(&hdev->children[port]);
clear_bit(port, hub->change_bits);
+#ifdef CONFIG_USB_OTG
+ /* during HNP, don't repeat the debounce */
+ if (hdev->bus->is_b_host)
+ portchange &= ~USB_PORT_STAT_C_CONNECTION;
+#endif
+
if (portchange & USB_PORT_STAT_C_CONNECTION) {
status = hub_port_debounce(hdev, port);
if (status < 0) {
/* Lock the device, then check to see if we were
* disconnected while waiting for the lock to succeed. */
- down(&hdev->serialize);
+ if (locktree(hdev) < 0)
+ break;
if (hdev->state != USB_STATE_CONFIGURED ||
!hdev->actconfig ||
hub != usb_get_intfdata(
}
/**
- * usb_reset_devce - perform a USB port reset to reinitialize a device
+ * usb_reset_device - perform a USB port reset to reinitialize a device
* @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
*
* WARNING - don't reset any device unless drivers for all of its
struct usb_interface *intf = udev->actconfig->interface[i];
struct usb_interface_descriptor *desc;
- /* set_interface resets host side toggle and halt status even
+ /* set_interface resets host side toggle even
* for altsetting zero. the interface may have no driver.
*/
desc = &intf->cur_altsetting->desc;
git://git.onelab.eu / linux-2.6.git / blobdiff