#include "hcd.h"
#include "hub.h"
+struct usb_hub {
+ struct device *intfdev; /* the "interface" device */
+ struct usb_device *hdev;
+ struct urb *urb; /* for interrupt polling pipe */
+
+ /* buffer for urb ... with extra space in case of babble */
+ char (*buffer)[8];
+ dma_addr_t buffer_dma; /* DMA address for buffer */
+ union {
+ struct usb_hub_status hub;
+ struct usb_port_status port;
+ } *status; /* buffer for status reports */
+
+ int error; /* last reported error */
+ int nerrors; /* track consecutive errors */
+
+ struct list_head event_list; /* hubs w/data or errs ready */
+ unsigned long event_bits[1]; /* status change bitmask */
+ unsigned long change_bits[1]; /* ports with logical connect
+ status change */
+ unsigned long busy_bits[1]; /* ports being reset or
+ resumed */
+#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
+#error event_bits[] is too short!
+#endif
+
+ struct usb_hub_descriptor *descriptor; /* class descriptor */
+ struct usb_tt tt; /* Transaction Translator */
+
+ unsigned mA_per_port; /* current for each child */
+
+ unsigned limited_power:1;
+ unsigned quiescing:1;
+ unsigned activating:1;
+
+ unsigned has_indicators:1;
+ u8 indicator[USB_MAXCHILDREN];
+ struct work_struct leds;
+};
+
+
/* Protect struct usb_device->state and ->children members
* Note: Both are also protected by ->dev.sem, except that ->state can
* change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
static struct task_struct *khubd_task;
+/* multithreaded probe logic */
+static int multithread_probe =
+#ifdef CONFIG_USB_MULTITHREAD_PROBE
+ 1;
+#else
+ 0;
+#endif
+module_param(multithread_probe, bool, S_IRUGO);
+MODULE_PARM_DESC(multithread_probe, "Run each USB device probe in a new thread");
+
/* cycle leds on hubs that aren't blinking for attention */
static int blinkenlights = 0;
module_param (blinkenlights, bool, S_IRUGO);
#define LED_CYCLE_PERIOD ((2*HZ)/3)
-static void led_work (void *__hub)
+static void led_work (struct work_struct *work)
{
- struct usb_hub *hub = __hub;
+ struct usb_hub *hub =
+ container_of(work, struct usb_hub, leds.work);
struct usb_device *hdev = hub->hdev;
unsigned i;
unsigned changed = 0;
{
unsigned long flags;
+ /* Suppress autosuspend until khubd runs */
+ to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
+
spin_lock_irqsave(&hub_event_lock, flags);
if (list_empty(&hub->event_list)) {
list_add_tail(&hub->event_list, &hub_event_list);
/* completion function, fires on port status changes and various faults */
-static void hub_irq(struct urb *urb, struct pt_regs *regs)
+static void hub_irq(struct urb *urb)
{
- struct usb_hub *hub = (struct usb_hub *)urb->context;
+ struct usb_hub *hub = urb->context;
int status;
int i;
unsigned long bits;
goto resubmit;
hub->error = urb->status;
/* FALL THROUGH */
-
+
/* let khubd handle things */
case 0: /* we got data: port status changed */
bits = 0;
* talking to TTs must queue control transfers (not just bulk and iso), so
* both can talk to the same hub concurrently.
*/
-static void hub_tt_kevent (void *arg)
+static void hub_tt_kevent (struct work_struct *work)
{
- struct usb_hub *hub = arg;
+ struct usb_hub *hub =
+ container_of(work, struct usb_hub, tt.kevent);
unsigned long flags;
spin_lock_irqsave (&hub->tt.lock, flags);
msleep(max(pgood_delay, (unsigned) 100));
}
-static inline void __hub_quiesce(struct usb_hub *hub)
+static void hub_quiesce(struct usb_hub *hub)
{
/* (nonblocking) khubd and related activity won't re-trigger */
hub->quiescing = 1;
hub->activating = 0;
- hub->resume_root_hub = 0;
-}
-static void hub_quiesce(struct usb_hub *hub)
-{
/* (blocking) stop khubd and related activity */
- __hub_quiesce(hub);
usb_kill_urb(hub->urb);
if (hub->has_indicators)
cancel_delayed_work(&hub->leds);
hub->quiescing = 0;
hub->activating = 1;
- hub->resume_root_hub = 0;
+
status = usb_submit_urb(hub->urb, GFP_NOIO);
if (status < 0)
dev_err(hub->intfdev, "activate --> %d\n", status);
spin_lock_init (&hub->tt.lock);
INIT_LIST_HEAD (&hub->tt.clear_list);
- INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
+ INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
switch (hdev->descriptor.bDeviceProtocol) {
case 0:
break;
dev_dbg(hub_dev, "%sover-current condition exists\n",
(hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
- /* set up the interrupt endpoint */
+ /* set up the interrupt endpoint
+ * We use the EP's maxpacket size instead of (PORTS+1+7)/8
+ * bytes as USB2.0[11.12.3] says because some hubs are known
+ * to send more data (and thus cause overflow). For root hubs,
+ * maxpktsize is defined in hcd.c's fake endpoint descriptors
+ * to be big enough for at least USB_MAXCHILDREN ports. */
pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
endpoint = &desc->endpoint[0].desc;
- /* Output endpoint? Curiouser and curiouser.. */
- if (!(endpoint->bEndpointAddress & USB_DIR_IN))
- goto descriptor_error;
-
- /* If it's not an interrupt endpoint, we'd better punt! */
- if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
- != USB_ENDPOINT_XFER_INT)
+ /* If it's not an interrupt in endpoint, we'd better punt! */
+ if (!usb_endpoint_is_int_in(endpoint))
goto descriptor_error;
/* We found a hub */
INIT_LIST_HEAD(&hub->event_list);
hub->intfdev = &intf->dev;
hub->hdev = hdev;
- INIT_WORK(&hub->leds, led_work, hub);
+ INIT_DELAYED_WORK(&hub->leds, led_work);
usb_set_intfdata (intf, hub);
+ intf->needs_remote_wakeup = 1;
if (hdev->speed == USB_SPEED_HIGH)
highspeed_hubs++;
if (udev->children[i])
recursively_mark_NOTATTACHED(udev->children[i]);
}
+ if (udev->state == USB_STATE_SUSPENDED)
+ udev->discon_suspended = 1;
udev->state = USB_STATE_NOTATTACHED;
}
if (udev->state == USB_STATE_NOTATTACHED)
; /* do nothing */
else if (new_state != USB_STATE_NOTATTACHED) {
- udev->state = new_state;
/* root hub wakeup capabilities are managed out-of-band
* and may involve silicon errata ... ignore them here.
*/
if (udev->parent) {
- if (new_state == USB_STATE_CONFIGURED)
+ if (udev->state == USB_STATE_SUSPENDED
+ || new_state == USB_STATE_SUSPENDED)
+ ; /* No change to wakeup settings */
+ else if (new_state == USB_STATE_CONFIGURED)
device_init_wakeup(&udev->dev,
(udev->actconfig->desc.bmAttributes
& USB_CONFIG_ATT_WAKEUP));
- else if (new_state != USB_STATE_SUSPENDED)
+ else
device_init_wakeup(&udev->dev, 0);
}
+ udev->state = new_state;
} else
recursively_mark_NOTATTACHED(udev);
spin_unlock_irqrestore(&device_state_lock, flags);
}
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM
/**
* usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
unsigned long flags;
dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
+
+ /* Make sure no potential wakeup events get lost,
+ * by forcing the root hub to be resumed.
+ */
+ rhdev->dev.power.prev_state.event = PM_EVENT_ON;
+
spin_lock_irqsave(&device_state_lock, flags);
hub = hdev_to_hub(rhdev);
for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
}
EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
-#endif
+#endif /* CONFIG_PM */
static void choose_address(struct usb_device *udev)
{
* cleaning up all state associated with the current configuration
* so that the hardware is now fully quiesced.
*/
+ dev_dbg (&udev->dev, "unregistering device\n");
usb_disable_device(udev, 0);
- usb_notify_remove_device(udev);
+ usb_unlock_device(udev);
+
+ /* Unregister the device. The device driver is responsible
+ * for removing the device files from usbfs and sysfs and for
+ * de-configuring the device.
+ */
+ device_del(&udev->dev);
- /* Free the device number, remove the /proc/bus/usb entry and
- * the sysfs attributes, and delete the parent's children[]
+ /* Free the device number and delete the parent's children[]
* (or root_hub) pointer.
*/
- dev_dbg (&udev->dev, "unregistering device\n");
release_address(udev);
- usb_remove_sysfs_dev_files(udev);
/* Avoid races with recursively_mark_NOTATTACHED() */
spin_lock_irq(&device_state_lock);
*pdev = NULL;
spin_unlock_irq(&device_state_lock);
- usb_unlock_device(udev);
-
- device_unregister(&udev->dev);
-}
-
-static inline const char *plural(int n)
-{
- return (n == 1 ? "" : "s");
-}
-
-static int choose_configuration(struct usb_device *udev)
-{
- int i;
- int num_configs;
- int insufficient_power = 0;
- struct usb_host_config *c, *best;
-
- best = NULL;
- c = udev->config;
- num_configs = udev->descriptor.bNumConfigurations;
- for (i = 0; i < num_configs; (i++, c++)) {
- struct usb_interface_descriptor *desc = NULL;
-
- /* It's possible that a config has no interfaces! */
- if (c->desc.bNumInterfaces > 0)
- desc = &c->intf_cache[0]->altsetting->desc;
-
- /*
- * HP's USB bus-powered keyboard has only one configuration
- * and it claims to be self-powered; other devices may have
- * similar errors in their descriptors. If the next test
- * were allowed to execute, such configurations would always
- * be rejected and the devices would not work as expected.
- * In the meantime, we run the risk of selecting a config
- * that requires external power at a time when that power
- * isn't available. It seems to be the lesser of two evils.
- *
- * Bugzilla #6448 reports a device that appears to crash
- * when it receives a GET_DEVICE_STATUS request! We don't
- * have any other way to tell whether a device is self-powered,
- * but since we don't use that information anywhere but here,
- * the call has been removed.
- *
- * Maybe the GET_DEVICE_STATUS call and the test below can
- * be reinstated when device firmwares become more reliable.
- * Don't hold your breath.
- */
-#if 0
- /* Rule out self-powered configs for a bus-powered device */
- if (bus_powered && (c->desc.bmAttributes &
- USB_CONFIG_ATT_SELFPOWER))
- continue;
-#endif
-
- /*
- * The next test may not be as effective as it should be.
- * Some hubs have errors in their descriptor, claiming
- * to be self-powered when they are really bus-powered.
- * We will overestimate the amount of current such hubs
- * make available for each port.
- *
- * This is a fairly benign sort of failure. It won't
- * cause us to reject configurations that we should have
- * accepted.
- */
-
- /* Rule out configs that draw too much bus current */
- if (c->desc.bMaxPower * 2 > udev->bus_mA) {
- insufficient_power++;
- continue;
- }
-
- /* If the first config's first interface is COMM/2/0xff
- * (MSFT RNDIS), rule it out unless Linux has host-side
- * RNDIS support. */
- if (i == 0 && desc
- && desc->bInterfaceClass == USB_CLASS_COMM
- && desc->bInterfaceSubClass == 2
- && desc->bInterfaceProtocol == 0xff) {
-#ifndef CONFIG_USB_NET_RNDIS_HOST
- continue;
-#else
- best = c;
-#endif
- }
-
- /* From the remaining configs, choose the first one whose
- * first interface is for a non-vendor-specific class.
- * Reason: Linux is more likely to have a class driver
- * than a vendor-specific driver. */
- else if (udev->descriptor.bDeviceClass !=
- USB_CLASS_VENDOR_SPEC &&
- (!desc || desc->bInterfaceClass !=
- USB_CLASS_VENDOR_SPEC)) {
- best = c;
- break;
- }
-
- /* If all the remaining configs are vendor-specific,
- * choose the first one. */
- else if (!best)
- best = c;
+ /* Decrement the parent's count of unsuspended children */
+ if (udev->parent) {
+ usb_pm_lock(udev);
+ if (!udev->discon_suspended)
+ usb_autosuspend_device(udev->parent);
+ usb_pm_unlock(udev);
}
- if (insufficient_power > 0)
- dev_info(&udev->dev, "rejected %d configuration%s "
- "due to insufficient available bus power\n",
- insufficient_power, plural(insufficient_power));
-
- if (best) {
- i = best->desc.bConfigurationValue;
- dev_info(&udev->dev,
- "configuration #%d chosen from %d choice%s\n",
- i, num_configs, plural(num_configs));
- } else {
- i = -1;
- dev_warn(&udev->dev,
- "no configuration chosen from %d choice%s\n",
- num_configs, plural(num_configs));
- }
- return i;
+ put_device(&udev->dev);
}
#ifdef DEBUG
#ifdef CONFIG_USB_OTG
#include "otg_whitelist.h"
+static int __usb_port_suspend(struct usb_device *, int port1);
#endif
-/**
- * usb_new_device - perform initial device setup (usbcore-internal)
- * @udev: newly addressed device (in ADDRESS state)
- *
- * This is called with devices which have been enumerated, but not yet
- * configured. The device descriptor is available, but not descriptors
- * for any device configuration. The caller must have locked either
- * the parent hub (if udev is a normal device) or else the
- * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
- * udev has already been installed, but udev is not yet visible through
- * sysfs or other filesystem code.
- *
- * Returns 0 for success (device is configured and listed, with its
- * interfaces, in sysfs); else a negative errno value.
- *
- * This call is synchronous, and may not be used in an interrupt context.
- *
- * Only the hub driver or root-hub registrar should ever call this.
- */
-int usb_new_device(struct usb_device *udev)
+static int __usb_new_device(void *void_data)
{
+ struct usb_device *udev = void_data;
int err;
- int c;
+
+ /* Lock ourself into memory in order to keep a probe sequence
+ * sleeping in a new thread from allowing us to be unloaded.
+ */
+ if (!try_module_get(THIS_MODULE))
+ return -EINVAL;
err = usb_get_configuration(udev);
if (err < 0) {
USB_DT_OTG, (void **) &desc) == 0) {
if (desc->bmAttributes & USB_OTG_HNP) {
unsigned port1 = udev->portnum;
- struct usb_device *root = udev->parent;
-
+
dev_info(&udev->dev,
"Dual-Role OTG device on %sHNP port\n",
(port1 == bus->otg_port)
* (Includes HNP test device.)
*/
if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
- static int __usb_suspend_device(struct usb_device *,
- int port1);
- err = __usb_suspend_device(udev, udev->bus->otg_port);
+ err = __usb_port_suspend(udev, udev->bus->otg_port);
if (err < 0)
dev_dbg(&udev->dev, "HNP fail, %d\n", err);
}
}
#endif
- /* put device-specific files into sysfs */
+ /* Register the device. The device driver is responsible
+ * for adding the device files to usbfs and sysfs and for
+ * configuring the device.
+ */
err = device_add (&udev->dev);
if (err) {
dev_err(&udev->dev, "can't device_add, error %d\n", err);
goto fail;
}
- usb_create_sysfs_dev_files (udev);
-
- usb_lock_device(udev);
-
- /* choose and set the configuration. that registers the interfaces
- * with the driver core, and lets usb device drivers bind to them.
- */
- c = choose_configuration(udev);
- if (c >= 0) {
- err = usb_set_configuration(udev, c);
- if (err) {
- dev_err(&udev->dev, "can't set config #%d, error %d\n",
- c, err);
- /* This need not be fatal. The user can try to
- * set other configurations. */
- }
- }
-
- /* USB device state == configured ... usable */
- usb_notify_add_device(udev);
- usb_unlock_device(udev);
+ /* Increment the parent's count of unsuspended children */
+ if (udev->parent)
+ usb_autoresume_device(udev->parent);
- return 0;
+exit:
+ module_put(THIS_MODULE);
+ return err;
fail:
usb_set_device_state(udev, USB_STATE_NOTATTACHED);
- return err;
+ goto exit;
}
+/**
+ * usb_new_device - perform initial device setup (usbcore-internal)
+ * @udev: newly addressed device (in ADDRESS state)
+ *
+ * This is called with devices which have been enumerated, but not yet
+ * configured. The device descriptor is available, but not descriptors
+ * for any device configuration. The caller must have locked either
+ * the parent hub (if udev is a normal device) or else the
+ * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
+ * udev has already been installed, but udev is not yet visible through
+ * sysfs or other filesystem code.
+ *
+ * The return value for this function depends on if the
+ * multithread_probe variable is set or not. If it's set, it will
+ * return a if the probe thread was successfully created or not. If the
+ * variable is not set, it will return if the device is configured
+ * properly or not. interfaces, in sysfs); else a negative errno value.
+ *
+ * This call is synchronous, and may not be used in an interrupt context.
+ *
+ * Only the hub driver or root-hub registrar should ever call this.
+ */
+int usb_new_device(struct usb_device *udev)
+{
+ struct task_struct *probe_task;
+ int ret = 0;
+
+ if (multithread_probe) {
+ probe_task = kthread_run(__usb_new_device, udev,
+ "usb-probe-%s", udev->devnum);
+ if (IS_ERR(probe_task))
+ ret = PTR_ERR(probe_task);
+ } else
+ ret = __usb_new_device(udev);
+
+ return ret;
+}
static int hub_port_status(struct usb_hub *hub, int port1,
u16 *status, u16 *change)
int ret;
ret = get_port_status(hub->hdev, port1, &hub->status->port);
- if (ret < 0)
+ if (ret < 4) {
dev_err (hub->intfdev,
"%s failed (err = %d)\n", __FUNCTION__, ret);
- else {
+ if (ret >= 0)
+ ret = -EIO;
+ } else {
*status = le16_to_cpu(hub->status->port.wPortStatus);
*change = le16_to_cpu(hub->status->port.wPortChange);
ret = 0;
return ret;
}
+
+/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
+static unsigned hub_is_wusb(struct usb_hub *hub)
+{
+ struct usb_hcd *hcd;
+ if (hub->hdev->parent != NULL) /* not a root hub? */
+ return 0;
+ hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
+ return hcd->wireless;
+}
+
+
#define PORT_RESET_TRIES 5
#define SET_ADDRESS_TRIES 2
#define GET_DESCRIPTOR_TRIES 2
/* if we`ve finished resetting, then break out of the loop */
if (!(portstatus & USB_PORT_STAT_RESET) &&
(portstatus & USB_PORT_STAT_ENABLE)) {
- if (portstatus & USB_PORT_STAT_HIGH_SPEED)
+ if (hub_is_wusb(hub))
+ udev->speed = USB_SPEED_VARIABLE;
+ else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
udev->speed = USB_SPEED_HIGH;
else if (portstatus & USB_PORT_STAT_LOW_SPEED)
udev->speed = USB_SPEED_LOW;
kick_khubd(hub);
}
+#ifdef CONFIG_PM
#ifdef CONFIG_USB_SUSPEND
* NOTE: OTG devices may issue remote wakeup (or SRP) even when
* we don't explicitly enable it here.
*/
- if (device_may_wakeup(&udev->dev)) {
+ if (udev->do_remote_wakeup) {
status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
USB_DEVICE_REMOTE_WAKEUP, 0,
USB_CTRL_SET_TIMEOUT);
} else {
/* device has up to 10 msec to fully suspend */
- dev_dbg(&udev->dev, "usb suspend\n");
+ dev_dbg(&udev->dev, "usb %ssuspend\n",
+ udev->auto_pm ? "auto-" : "");
usb_set_device_state(udev, USB_STATE_SUSPENDED);
msleep(10);
}
* the root hub for their bus goes into global suspend ... so we don't
* (falsely) update the device power state to say it suspended.
*/
-static int __usb_suspend_device (struct usb_device *udev, int port1)
+static int __usb_port_suspend (struct usb_device *udev, int port1)
{
int status = 0;
if (port1 < 0)
return port1;
- if (udev->state == USB_STATE_SUSPENDED
- || udev->state == USB_STATE_NOTATTACHED) {
- return 0;
- }
-
- /* all interfaces must already be suspended */
- if (udev->actconfig) {
- int i;
-
- for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
- struct usb_interface *intf;
-
- intf = udev->actconfig->interface[i];
- if (is_active(intf)) {
- dev_dbg(&intf->dev, "nyet suspended\n");
- return -EBUSY;
- }
- }
- }
-
- /* we only change a device's upstream USB link.
- * root hubs have no upstream USB link.
+ /* we change the device's upstream USB link,
+ * but root hubs have no upstream USB link.
*/
if (udev->parent)
status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
udev);
-
- if (status == 0)
- udev->dev.power.power_state = PMSG_SUSPEND;
+ else {
+ dev_dbg(&udev->dev, "usb %ssuspend\n",
+ udev->auto_pm ? "auto-" : "");
+ usb_set_device_state(udev, USB_STATE_SUSPENDED);
+ }
return status;
}
-#endif
-
/*
- * usb_suspend_device - suspend a usb device
+ * usb_port_suspend - suspend a usb device's upstream port
* @udev: device that's no longer in active use
* Context: must be able to sleep; device not locked; pm locks held
*
* 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
+ * suspend by the host, using usb_port_resume(). It's also routine
* to disconnect devices while they are suspended.
*
* This only affects the USB hardware for a device; its interfaces
*
* Returns 0 on success, else negative errno.
*/
-int usb_suspend_device(struct usb_device *udev)
+int usb_port_suspend(struct usb_device *udev)
{
-#ifdef CONFIG_USB_SUSPEND
- if (udev->state == USB_STATE_NOTATTACHED)
- return -ENODEV;
- return __usb_suspend_device(udev, udev->portnum);
-#else
- /* NOTE: udev->state unchanged, it's not lying ... */
- udev->dev.power.power_state = PMSG_SUSPEND;
- return 0;
-#endif
+ return __usb_port_suspend(udev, udev->portnum);
}
/*
* resume (by host) or remote wakeup (by device) ... now see what changed
* in the tree that's rooted at this device.
*/
-static int finish_device_resume(struct usb_device *udev)
+static int finish_port_resume(struct usb_device *udev)
{
int status;
u16 devstatus;
usb_set_device_state(udev, udev->actconfig
? USB_STATE_CONFIGURED
: USB_STATE_ADDRESS);
- udev->dev.power.power_state = PMSG_ON;
/* 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,
"gone after usb resume? status %d\n",
status);
else if (udev->actconfig) {
- unsigned i;
- int (*resume)(struct device *);
-
le16_to_cpus(&devstatus);
if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
&& udev->parent) {
USB_DEVICE_REMOTE_WAKEUP, 0,
NULL, 0,
USB_CTRL_SET_TIMEOUT);
- if (status) {
+ if (status)
dev_dbg(&udev->dev, "disable remote "
"wakeup, status %d\n", status);
- status = 0;
- }
- }
-
- /* resume interface drivers; if this is a hub, it
- * may have a child resume event to deal with soon
- */
- resume = udev->dev.bus->resume;
- for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
- struct device *dev =
- &udev->actconfig->interface[i]->dev;
-
- down(&dev->sem);
- (void) resume(dev);
- up(&dev->sem);
}
status = 0;
return status;
}
-#ifdef CONFIG_USB_SUSPEND
-
static int
hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
{
int status;
+ u16 portchange, portstatus;
+
+ /* Skip the initial Clear-Suspend step for a remote wakeup */
+ status = hub_port_status(hub, port1, &portstatus, &portchange);
+ if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
+ goto SuspendCleared;
// dev_dbg(hub->intfdev, "resume port %d\n", port1);
+ set_bit(port1, hub->busy_bits);
+
/* see 7.1.7.7; affects power usage, but not budgeting */
status = clear_port_feature(hub->hdev,
port1, USB_PORT_FEAT_SUSPEND);
"can't resume port %d, status %d\n",
port1, status);
} else {
- u16 devstatus;
- u16 portchange;
-
/* drive resume for at least 20 msec */
if (udev)
- dev_dbg(&udev->dev, "RESUME\n");
+ dev_dbg(&udev->dev, "usb %sresume\n",
+ udev->auto_pm ? "auto-" : "");
msleep(25);
#define LIVE_FLAGS ( USB_PORT_STAT_POWER \
* stop resume signaling. Then finish the resume
* sequence.
*/
- devstatus = portchange = 0;
- status = hub_port_status(hub, port1,
- &devstatus, &portchange);
+ status = hub_port_status(hub, port1, &portstatus, &portchange);
+SuspendCleared:
if (status < 0
- || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
- || (devstatus & USB_PORT_STAT_SUSPEND) != 0
+ || (portstatus & LIVE_FLAGS) != LIVE_FLAGS
+ || (portstatus & USB_PORT_STAT_SUSPEND) != 0
) {
dev_dbg(hub->intfdev,
"port %d status %04x.%04x after resume, %d\n",
- port1, portchange, devstatus, status);
+ port1, portchange, portstatus, status);
if (status >= 0)
status = -ENODEV;
} else {
/* TRSMRCY = 10 msec */
msleep(10);
if (udev)
- status = finish_device_resume(udev);
+ status = finish_port_resume(udev);
}
}
if (status < 0)
hub_port_logical_disconnect(hub, port1);
+ clear_bit(port1, hub->busy_bits);
+ if (!hub->hdev->parent && !hub->busy_bits[0])
+ usb_enable_root_hub_irq(hub->hdev->bus);
+
return status;
}
-#endif
-
/*
- * usb_resume_device - re-activate a suspended usb device
+ * usb_port_resume - re-activate a suspended usb device's upstream port
* @udev: device to re-activate
* Context: must be able to sleep; device not locked; pm locks held
*
*
* Returns 0 on success, else negative errno.
*/
-int usb_resume_device(struct usb_device *udev)
+int usb_port_resume(struct usb_device *udev)
{
int status;
- if (udev->state == USB_STATE_NOTATTACHED)
- return -ENODEV;
-
- /* selective resume of one downstream hub-to-device port */
+ /* we change the device's upstream USB link,
+ * but root hubs have no upstream USB link.
+ */
if (udev->parent) {
-#ifdef CONFIG_USB_SUSPEND
- if (udev->state == USB_STATE_SUSPENDED) {
- // NOTE swsusp may bork us, device state being wrong...
- // NOTE this fails if parent is also suspended...
- status = hub_port_resume(hdev_to_hub(udev->parent),
- udev->portnum, udev);
- } else
-#endif
- status = 0;
- } else
- status = finish_device_resume(udev);
- if (status < 0)
- dev_dbg(&udev->dev, "can't resume, status %d\n",
- status);
-
- /* rebind drivers that had no suspend() */
- if (status == 0) {
- usb_unlock_device(udev);
- bus_rescan_devices(&usb_bus_type);
- usb_lock_device(udev);
+ // NOTE this fails if parent is also suspended...
+ status = hub_port_resume(hdev_to_hub(udev->parent),
+ udev->portnum, udev);
+ } else {
+ dev_dbg(&udev->dev, "usb %sresume\n",
+ udev->auto_pm ? "auto-" : "");
+ status = finish_port_resume(udev);
}
+ if (status < 0)
+ dev_dbg(&udev->dev, "can't resume, status %d\n", status);
return status;
}
{
int status = 0;
-#ifdef CONFIG_USB_SUSPEND
-
- /* don't repeat RESUME sequence if this device
- * was already woken up by some other task
- */
usb_lock_device(udev);
if (udev->state == USB_STATE_SUSPENDED) {
- dev_dbg(&udev->dev, "RESUME (wakeup)\n");
- /* TRSMRCY = 10 msec */
- msleep(10);
- status = finish_device_resume(udev);
+ dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
+ status = usb_autoresume_device(udev);
+
+ /* Give the interface drivers a chance to do something,
+ * then autosuspend the device again. */
+ if (status == 0)
+ usb_autosuspend_device(udev);
}
usb_unlock_device(udev);
-#endif
return status;
}
+#else /* CONFIG_USB_SUSPEND */
+
+/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
+
+int usb_port_suspend(struct usb_device *udev)
+{
+ return 0;
+}
+
+static inline int
+finish_port_resume(struct usb_device *udev)
+{
+ return 0;
+}
+
+static inline int
+hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
+{
+ return 0;
+}
+
+int usb_port_resume(struct usb_device *udev)
+{
+ return 0;
+}
+
+static inline int remote_wakeup(struct usb_device *udev)
+{
+ return 0;
+}
+
+#endif
+
static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
{
struct usb_hub *hub = usb_get_intfdata (intf);
struct usb_device *udev;
udev = hdev->children [port1-1];
- if (udev && (udev->dev.power.power_state.event
- == PM_EVENT_ON
+ if (udev && msg.event == PM_EVENT_SUSPEND &&
#ifdef CONFIG_USB_SUSPEND
- || udev->state != USB_STATE_SUSPENDED
+ udev->state != USB_STATE_SUSPENDED
+#else
+ udev->dev.power.power_state.event
+ == PM_EVENT_ON
#endif
- )) {
- dev_dbg(&intf->dev, "port %d nyet suspended\n", port1);
+ ) {
+ if (!hdev->auto_pm)
+ dev_dbg(&intf->dev, "port %d nyet suspended\n",
+ port1);
return -EBUSY;
}
}
+ dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
+
/* "global suspend" of the downstream HC-to-USB interface */
if (!hdev->parent) {
struct usb_bus *bus = hdev->bus;
static int hub_resume(struct usb_interface *intf)
{
- struct usb_device *hdev = interface_to_usbdev(intf);
struct usb_hub *hub = usb_get_intfdata (intf);
+ struct usb_device *hdev = hub->hdev;
int status;
+ dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
+
/* "global resume" of the downstream HC-to-USB interface */
if (!hdev->parent) {
struct usb_bus *bus = hdev->bus;
}
}
+ /* tell khubd to look for changes on this hub */
hub_activate(hub);
-
- /* REVISIT: this recursion probably shouldn't exist. Remove
- * this code sometime, after retesting with different root and
- * external hubs.
- */
-#ifdef CONFIG_USB_SUSPEND
- {
- unsigned port1;
-
- for (port1 = 1; port1 <= hdev->maxchild; port1++) {
- struct usb_device *udev;
- u16 portstat, portchange;
-
- udev = hdev->children [port1-1];
- status = hub_port_status(hub, port1, &portstat, &portchange);
- if (status == 0) {
- if (portchange & USB_PORT_STAT_C_SUSPEND) {
- clear_port_feature(hdev, port1,
- USB_PORT_FEAT_C_SUSPEND);
- portchange &= ~USB_PORT_STAT_C_SUSPEND;
- }
-
- /* let khubd handle disconnects etc */
- if (portchange)
- continue;
- }
-
- if (!udev || status < 0)
- continue;
- usb_lock_device(udev);
- if (portstat & USB_PORT_STAT_SUSPEND)
- status = hub_port_resume(hub, port1, udev);
- else {
- status = finish_device_resume(udev);
- if (status < 0) {
- dev_dbg(&intf->dev, "resume port %d --> %d\n",
- port1, status);
- hub_port_logical_disconnect(hub, port1);
- }
- }
- usb_unlock_device(udev);
- }
- }
-#endif
return 0;
}
-void usb_suspend_root_hub(struct usb_device *hdev)
-{
- struct usb_hub *hub = hdev_to_hub(hdev);
+#else /* CONFIG_PM */
- /* This also makes any led blinker stop retriggering. We're called
- * from irq, so the blinker might still be scheduled. Caller promises
- * that the root hub status URB will be canceled.
- */
- __hub_quiesce(hub);
- mark_quiesced(to_usb_interface(hub->intfdev));
+static inline int remote_wakeup(struct usb_device *udev)
+{
+ return 0;
}
+#define hub_suspend NULL
+#define hub_resume NULL
+#endif
+
void usb_resume_root_hub(struct usb_device *hdev)
{
struct usb_hub *hub = hdev_to_hub(hdev);
- hub->resume_root_hub = 1;
kick_khubd(hub);
}
int i, j, retval;
unsigned delay = HUB_SHORT_RESET_TIME;
enum usb_device_speed oldspeed = udev->speed;
+ char *speed, *type;
/* root hub ports have a slightly longer reset period
* (from USB 2.0 spec, section 7.1.7.5)
/* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
* it's fixed size except for full speed devices.
+ * For Wireless USB devices, ep0 max packet is always 512 (tho
+ * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
*/
switch (udev->speed) {
+ case USB_SPEED_VARIABLE: /* fixed at 512 */
+ udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
+ break;
case USB_SPEED_HIGH: /* fixed at 64 */
udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
break;
goto fail;
}
+ type = "";
+ switch (udev->speed) {
+ case USB_SPEED_LOW: speed = "low"; break;
+ case USB_SPEED_FULL: speed = "full"; break;
+ case USB_SPEED_HIGH: speed = "high"; break;
+ case USB_SPEED_VARIABLE:
+ speed = "variable";
+ type = "Wireless ";
+ break;
+ default: speed = "?"; break;
+ }
dev_info (&udev->dev,
- "%s %s speed USB device using %s and address %d\n",
- (udev->config) ? "reset" : "new",
- ({ char *speed; switch (udev->speed) {
- case USB_SPEED_LOW: speed = "low"; break;
- case USB_SPEED_FULL: speed = "full"; break;
- case USB_SPEED_HIGH: speed = "high"; break;
- default: speed = "?"; break;
- }; speed;}),
- udev->bus->controller->driver->name,
- udev->devnum);
+ "%s %s speed %sUSB device using %s and address %d\n",
+ (udev->config) ? "reset" : "new", speed, type,
+ udev->bus->controller->driver->name, udev->devnum);
/* Set up TT records, if needed */
if (hdev->tt) {
* down tremendously by NAKing the unexpectedly
* early status stage. Also, retry on all errors;
* some devices are flakey.
+ * 255 is for WUSB devices, we actually need to use 512.
+ * WUSB1.0[4.8.1].
*/
for (j = 0; j < 3; ++j) {
buf->bMaxPacketSize0 = 0;
buf, GET_DESCRIPTOR_BUFSIZE,
(i ? USB_CTRL_GET_TIMEOUT : 1000));
switch (buf->bMaxPacketSize0) {
- case 8: case 16: case 32: case 64:
+ case 8: case 16: case 32: case 64: case 255:
if (buf->bDescriptorType ==
USB_DT_DEVICE) {
r = 0;
if (retval)
goto fail;
- i = udev->descriptor.bMaxPacketSize0;
+ i = udev->descriptor.bMaxPacketSize0 == 0xff?
+ 512 : udev->descriptor.bMaxPacketSize0;
if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
if (udev->speed != USB_SPEED_FULL ||
!(i == 8 || i == 16 || i == 32 || i == 64)) {
/* hub LEDs are probably harder to miss than syslog */
if (hub->has_indicators) {
hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
- schedule_work (&hub->leds);
+ schedule_delayed_work (&hub->leds, 0);
}
}
kfree(qual);
usb_set_device_state(udev, USB_STATE_POWERED);
udev->speed = USB_SPEED_UNKNOWN;
udev->bus_mA = hub->mA_per_port;
+ udev->level = hdev->level + 1;
/* set the address */
choose_address(udev);
if (hub->has_indicators) {
hub->indicator[port1-1] =
INDICATOR_AMBER_BLINK;
- schedule_work (&hub->leds);
+ schedule_delayed_work (&hub->leds, 0);
}
status = -ENOTCONN; /* Don't retry */
goto loop_disable;
intf = to_usb_interface(hub->intfdev);
hub_dev = &intf->dev;
- i = hub->resume_root_hub;
-
- dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
+ dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
hdev->state, hub->descriptor
? hub->descriptor->bNbrPorts
: 0,
/* NOTE: expects max 15 ports... */
(u16) hub->change_bits[0],
- (u16) hub->event_bits[0],
- i ? ", resume root" : "");
+ (u16) hub->event_bits[0]);
usb_get_intf(intf);
spin_unlock_irq(&hub_event_lock);
- /* Is this is a root hub wanting to reactivate the downstream
- * ports? If so, be sure the interface resumes even if its
- * stub "device" node was never suspended.
- */
- if (i) {
- dpm_runtime_resume(&hdev->dev);
- dpm_runtime_resume(&intf->dev);
- usb_put_intf(intf);
- continue;
- }
-
/* Lock the device, then check to see if we were
* disconnected while waiting for the lock to succeed. */
if (locktree(hdev) < 0) {
goto loop;
}
- /* If this is an inactive or suspended hub, do nothing */
- if (hub->quiescing)
+ /* Autoresume */
+ ret = usb_autopm_get_interface(intf);
+ if (ret) {
+ dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
goto loop;
+ }
+
+ /* If this is an inactive hub, do nothing */
+ if (hub->quiescing)
+ goto loop_autopm;
if (hub->error) {
dev_dbg (hub_dev, "resetting for error %d\n",
if (ret) {
dev_dbg (hub_dev,
"error resetting hub: %d\n", ret);
- goto loop;
+ goto loop_autopm;
}
hub->nerrors = 0;
/* If this is a root hub, tell the HCD it's okay to
* re-enable port-change interrupts now. */
- if (!hdev->parent)
+ if (!hdev->parent && !hub->busy_bits[0])
usb_enable_root_hub_irq(hdev->bus);
+loop_autopm:
+ /* Allow autosuspend if we're not going to run again */
+ if (list_empty(&hub->event_list))
+ usb_autopm_enable(intf);
loop:
usb_unlock_device(hdev);
usb_put_intf(intf);
.post_reset = hub_post_reset,
.ioctl = hub_ioctl,
.id_table = hub_id_table,
+ .supports_autosuspend = 1,
};
int usb_hub_init(void)
break;
}
clear_bit(port1, parent_hub->busy_bits);
+ if (!parent_hdev->parent && !parent_hub->busy_bits[0])
+ usb_enable_root_hub_irq(parent_hdev->bus);
+
if (ret < 0)
goto re_enumerate;
hub_port_logical_disconnect(parent_hub, port1);
return -ENODEV;
}
+EXPORT_SYMBOL(usb_reset_device);
/**
* usb_reset_composite_device - warn interface drivers and perform a USB port reset
return -EINVAL;
}
+ /* Prevent autosuspend during the reset */
+ usb_autoresume_device(udev);
+
if (iface && iface->condition != USB_INTERFACE_BINDING)
iface = NULL;
}
}
+ usb_autosuspend_device(udev);
return ret;
}
+EXPORT_SYMBOL(usb_reset_composite_device);
projects / linux-drm-fsl-dcu.git / blobdiff