#include <linux/device.h>
#include <linux/usb.h>
+#include <linux/workqueue.h>
#include "hcd.h"
#include "usb.h"
-static int usb_match_one_id(struct usb_interface *interface,
- const struct usb_device_id *id);
-
-struct usb_dynid {
- struct list_head node;
- struct usb_device_id id;
-};
-
#ifdef CONFIG_HOTPLUG
/*
* Adds a new dynamic USBdevice ID to this driver,
* and cause the driver to probe for all devices again.
*/
-static ssize_t store_new_id(struct device_driver *driver,
- const char *buf, size_t count)
+ssize_t usb_store_new_id(struct usb_dynids *dynids,
+ struct device_driver *driver,
+ const char *buf, size_t count)
{
- struct usb_driver *usb_drv = to_usb_driver(driver);
struct usb_dynid *dynid;
u32 idVendor = 0;
u32 idProduct = 0;
int fields = 0;
+ int retval = 0;
fields = sscanf(buf, "%x %x", &idVendor, &idProduct);
if (fields < 2)
dynid->id.idProduct = idProduct;
dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE;
- spin_lock(&usb_drv->dynids.lock);
- list_add_tail(&usb_drv->dynids.list, &dynid->node);
- spin_unlock(&usb_drv->dynids.lock);
+ spin_lock(&dynids->lock);
+ list_add_tail(&dynids->list, &dynid->node);
+ spin_unlock(&dynids->lock);
if (get_driver(driver)) {
- driver_attach(driver);
+ retval = driver_attach(driver);
put_driver(driver);
}
+ if (retval)
+ return retval;
return count;
}
+EXPORT_SYMBOL_GPL(usb_store_new_id);
+
+static ssize_t store_new_id(struct device_driver *driver,
+ const char *buf, size_t count)
+{
+ struct usb_driver *usb_drv = to_usb_driver(driver);
+
+ return usb_store_new_id(&usb_drv->dynids, driver, buf, count);
+}
static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
static int usb_create_newid_file(struct usb_driver *usb_drv)
udev = to_usb_device(dev);
- /* FIXME: resume a suspended device */
- if (udev->state == USB_STATE_SUSPENDED)
- return -EHOSTUNREACH;
-
/* TODO: Add real matching code */
+ /* The device should always appear to be in use
+ * unless the driver suports autosuspend.
+ */
+ udev->pm_usage_cnt = !(udriver->supports_autosuspend);
+
error = udriver->probe(udev);
return error;
}
{
struct usb_driver *driver = to_usb_driver(dev->driver);
struct usb_interface *intf;
+ struct usb_device *udev;
const struct usb_device_id *id;
int error = -ENODEV;
return error;
intf = to_usb_interface(dev);
-
- /* FIXME we'd much prefer to just resume it ... */
- if (interface_to_usbdev(intf)->state == USB_STATE_SUSPENDED)
- return -EHOSTUNREACH;
+ udev = interface_to_usbdev(intf);
id = usb_match_id(intf, driver->id_table);
if (!id)
if (id) {
dev_dbg(dev, "%s - got id\n", __FUNCTION__);
+ error = usb_autoresume_device(udev);
+ if (error)
+ return error;
+
/* Interface "power state" doesn't correspond to any hardware
* state whatsoever. We use it to record when it's bound to
* a driver that may start I/0: it's not frozen/quiesced.
*/
mark_active(intf);
intf->condition = USB_INTERFACE_BINDING;
+
+ /* The interface should always appear to be in use
+ * unless the driver suports autosuspend.
+ */
+ intf->pm_usage_cnt = !(driver->supports_autosuspend);
+
error = driver->probe(intf, id);
if (error) {
mark_quiesced(intf);
+ intf->needs_remote_wakeup = 0;
intf->condition = USB_INTERFACE_UNBOUND;
} else
intf->condition = USB_INTERFACE_BOUND;
+
+ usb_autosuspend_device(udev);
}
return error;
{
struct usb_driver *driver = to_usb_driver(dev->driver);
struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_device *udev;
+ int error;
intf->condition = USB_INTERFACE_UNBINDING;
+ /* Autoresume for set_interface call below */
+ udev = interface_to_usbdev(intf);
+ error = usb_autoresume_device(udev);
+
/* release all urbs for this interface */
usb_disable_interface(interface_to_usbdev(intf), intf);
intf->altsetting[0].desc.bInterfaceNumber,
0);
usb_set_intfdata(intf, NULL);
+
intf->condition = USB_INTERFACE_UNBOUND;
mark_quiesced(intf);
+ intf->needs_remote_wakeup = 0;
+
+ if (!error)
+ usb_autosuspend_device(udev);
return 0;
}
struct usb_interface *iface, void* priv)
{
struct device *dev = &iface->dev;
+ struct usb_device *udev = interface_to_usbdev(iface);
+ int retval = 0;
if (dev->driver)
return -EBUSY;
dev->driver = &driver->drvwrap.driver;
usb_set_intfdata(iface, priv);
+
+ usb_pm_lock(udev);
iface->condition = USB_INTERFACE_BOUND;
mark_active(iface);
+ iface->pm_usage_cnt = !(driver->supports_autosuspend);
+ usb_pm_unlock(udev);
/* if interface was already added, bind now; else let
* the future device_add() bind it, bypassing probe()
*/
if (device_is_registered(dev))
- device_bind_driver(dev);
+ retval = device_bind_driver(dev);
- return 0;
+ return retval;
}
EXPORT_SYMBOL(usb_driver_claim_interface);
struct usb_interface *iface)
{
struct device *dev = &iface->dev;
+ struct usb_device *udev = interface_to_usbdev(iface);
/* this should never happen, don't release something that's not ours */
if (!dev->driver || dev->driver != &driver->drvwrap.driver)
dev->driver = NULL;
usb_set_intfdata(iface, NULL);
+
+ usb_pm_lock(udev);
iface->condition = USB_INTERFACE_UNBOUND;
mark_quiesced(iface);
+ iface->needs_remote_wakeup = 0;
+ usb_pm_unlock(udev);
}
EXPORT_SYMBOL(usb_driver_release_interface);
/* returns 0 if no match, 1 if match */
-static int usb_match_one_id(struct usb_interface *interface,
- const struct usb_device_id *id)
+int usb_match_device(struct usb_device *dev, const struct usb_device_id *id)
{
- struct usb_host_interface *intf;
- struct usb_device *dev;
-
- /* proc_connectinfo in devio.c may call us with id == NULL. */
- if (id == NULL)
- return 0;
-
- intf = interface->cur_altsetting;
- dev = interface_to_usbdev(interface);
-
if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
id->idVendor != le16_to_cpu(dev->descriptor.idVendor))
return 0;
(id->bDeviceProtocol != dev->descriptor.bDeviceProtocol))
return 0;
+ return 1;
+}
+
+/* returns 0 if no match, 1 if match */
+int usb_match_one_id(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ struct usb_host_interface *intf;
+ struct usb_device *dev;
+
+ /* proc_connectinfo in devio.c may call us with id == NULL. */
+ if (id == NULL)
+ return 0;
+
+ intf = interface->cur_altsetting;
+ dev = interface_to_usbdev(interface);
+
+ if (!usb_match_device(dev, id))
+ return 0;
+
+ /* The interface class, subclass, and protocol should never be
+ * checked for a match if the device class is Vendor Specific,
+ * unless the match record specifies the Vendor ID. */
+ if (dev->descriptor.bDeviceClass == USB_CLASS_VENDOR_SPEC &&
+ !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
+ (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
+ USB_DEVICE_ID_MATCH_INT_SUBCLASS |
+ USB_DEVICE_ID_MATCH_INT_PROTOCOL)))
+ return 0;
+
if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
(id->bInterfaceClass != intf->desc.bInterfaceClass))
return 0;
return 1;
}
+EXPORT_SYMBOL_GPL(usb_match_one_id);
+
/**
* usb_match_id - find first usb_device_id matching device or interface
* @interface: the interface of interest
* most general; they let drivers bind to any interface on a
* multiple-function device. Use the USB_INTERFACE_INFO
* macro, or its siblings, to match class-per-interface style
- * devices (as recorded in bDeviceClass).
+ * devices (as recorded in bInterfaceClass).
+ *
+ * Note that an entry created by USB_INTERFACE_INFO won't match
+ * any interface if the device class is set to Vendor-Specific.
+ * This is deliberate; according to the USB spec the meanings of
+ * the interface class/subclass/protocol for these devices are also
+ * vendor-specific, and hence matching against a standard product
+ * class wouldn't work anyway. If you really want to use an
+ * interface-based match for such a device, create a match record
+ * that also specifies the vendor ID. (Unforunately there isn't a
+ * standard macro for creating records like this.)
*
* Within those groups, remember that not all combinations are
* meaningful. For example, don't give a product version range
}
EXPORT_SYMBOL_GPL_FUTURE(usb_match_id);
-int usb_device_match(struct device *dev, struct device_driver *drv)
+static int usb_device_match(struct device *dev, struct device_driver *drv)
{
/* devices and interfaces are handled separately */
if (is_usb_device(dev)) {
/* driver is often null here; dev_dbg() would oops */
pr_debug ("usb %s: uevent\n", dev->bus_id);
- if (is_usb_device(dev))
- return 0;
- else {
+ if (is_usb_device(dev)) {
+ usb_dev = to_usb_device(dev);
+ alt = NULL;
+ } else {
intf = to_usb_interface(dev);
usb_dev = interface_to_usbdev(intf);
alt = intf->cur_altsetting;
usb_dev->descriptor.bDeviceProtocol))
return -ENOMEM;
- if (add_uevent_var(envp, num_envp, &i,
+ if (!is_usb_device(dev)) {
+
+ if (add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"INTERFACE=%d/%d/%d",
alt->desc.bInterfaceClass,
alt->desc.bInterfaceSubClass,
alt->desc.bInterfaceProtocol))
- return -ENOMEM;
+ return -ENOMEM;
- if (add_uevent_var(envp, num_envp, &i,
+ if (add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"MODALIAS=usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic%02Xisc%02Xip%02X",
le16_to_cpu(usb_dev->descriptor.idVendor),
alt->desc.bInterfaceClass,
alt->desc.bInterfaceSubClass,
alt->desc.bInterfaceProtocol))
- return -ENOMEM;
+ return -ENOMEM;
+ }
envp[i] = NULL;
* usb_register_driver - register a USB interface driver
* @new_driver: USB operations for the interface driver
* @owner: module owner of this driver.
+ * @mod_name: module name string
*
* Registers a USB interface driver with the USB core. The list of
* unattached interfaces will be rescanned whenever a new driver is
* usb_register_dev() to enable that functionality. This function no longer
* takes care of that.
*/
-int usb_register_driver(struct usb_driver *new_driver, struct module *owner)
+int usb_register_driver(struct usb_driver *new_driver, struct module *owner,
+ const char *mod_name)
{
int retval = 0;
new_driver->drvwrap.driver.probe = usb_probe_interface;
new_driver->drvwrap.driver.remove = usb_unbind_interface;
new_driver->drvwrap.driver.owner = owner;
+ new_driver->drvwrap.driver.mod_name = mod_name;
spin_lock_init(&new_driver->dynids.lock);
INIT_LIST_HEAD(&new_driver->dynids.list);
#ifdef CONFIG_PM
-static int verify_suspended(struct device *dev, void *unused)
+/* Caller has locked udev's pm_mutex */
+static int usb_suspend_device(struct usb_device *udev, pm_message_t msg)
{
- if (dev->driver == NULL)
- return 0;
- return (dev->power.power_state.event == PM_EVENT_ON) ? -EBUSY : 0;
+ struct usb_device_driver *udriver;
+ int status = 0;
+
+ if (udev->state == USB_STATE_NOTATTACHED ||
+ udev->state == USB_STATE_SUSPENDED)
+ goto done;
+
+ /* For devices that don't have a driver, we do a standard suspend. */
+ if (udev->dev.driver == NULL) {
+ udev->do_remote_wakeup = 0;
+ status = usb_port_suspend(udev);
+ goto done;
+ }
+
+ udriver = to_usb_device_driver(udev->dev.driver);
+ status = udriver->suspend(udev, msg);
+
+done:
+ // dev_dbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status);
+ if (status == 0)
+ udev->dev.power.power_state.event = msg.event;
+ return status;
}
-static int usb_generic_suspend(struct device *dev, pm_message_t message)
+/* Caller has locked udev's pm_mutex */
+static int usb_resume_device(struct usb_device *udev)
{
- struct usb_interface *intf;
- struct usb_driver *driver;
- int status;
+ struct usb_device_driver *udriver;
+ int status = 0;
- /* USB devices enter SUSPEND state through their hubs, but can be
- * marked for FREEZE as soon as their children are already idled.
- * But those semantics are useless, so we equate the two (sigh).
- */
- if (is_usb_device(dev)) {
- if (dev->power.power_state.event == message.event)
- return 0;
- /* we need to rule out bogus requests through sysfs */
- status = device_for_each_child(dev, NULL, verify_suspended);
- if (status)
- return status;
- return usb_port_suspend(to_usb_device(dev));
+ if (udev->state == USB_STATE_NOTATTACHED ||
+ udev->state != USB_STATE_SUSPENDED)
+ goto done;
+
+ /* Can't resume it if it doesn't have a driver. */
+ if (udev->dev.driver == NULL) {
+ status = -ENOTCONN;
+ goto done;
}
- if (dev->driver == NULL)
- return 0;
+ udriver = to_usb_device_driver(udev->dev.driver);
+ status = udriver->resume(udev);
- intf = to_usb_interface(dev);
- driver = to_usb_driver(dev->driver);
+done:
+ // dev_dbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status);
+ if (status == 0)
+ udev->dev.power.power_state.event = PM_EVENT_ON;
+ return status;
+}
+
+/* Caller has locked intf's usb_device's pm mutex */
+static int usb_suspend_interface(struct usb_interface *intf, pm_message_t msg)
+{
+ struct usb_driver *driver;
+ int status = 0;
/* with no hardware, USB interfaces only use FREEZE and ON states */
- if (!is_active(intf))
- return 0;
+ if (interface_to_usbdev(intf)->state == USB_STATE_NOTATTACHED ||
+ !is_active(intf))
+ goto done;
+
+ if (intf->condition == USB_INTERFACE_UNBOUND) /* This can't happen */
+ goto done;
+ driver = to_usb_driver(intf->dev.driver);
if (driver->suspend && driver->resume) {
- status = driver->suspend(intf, message);
- if (status)
- dev_err(dev, "%s error %d\n", "suspend", status);
- else
+ status = driver->suspend(intf, msg);
+ if (status == 0)
mark_quiesced(intf);
+ else if (!interface_to_usbdev(intf)->auto_pm)
+ dev_err(&intf->dev, "%s error %d\n",
+ "suspend", status);
} else {
// FIXME else if there's no suspend method, disconnect...
- dev_warn(dev, "no suspend for driver %s?\n", driver->name);
+ // Not possible if auto_pm is set...
+ dev_warn(&intf->dev, "no suspend for driver %s?\n",
+ driver->name);
mark_quiesced(intf);
- status = 0;
}
+
+done:
+ // dev_dbg(&intf->dev, "%s: status %d\n", __FUNCTION__, status);
+ if (status == 0)
+ intf->dev.power.power_state.event = msg.event;
return status;
}
-static int usb_generic_resume(struct device *dev)
+/* Caller has locked intf's usb_device's pm_mutex */
+static int usb_resume_interface(struct usb_interface *intf)
{
- struct usb_interface *intf;
struct usb_driver *driver;
- struct usb_device *udev;
- int status;
+ int status = 0;
- if (dev->power.power_state.event == PM_EVENT_ON)
- return 0;
+ if (interface_to_usbdev(intf)->state == USB_STATE_NOTATTACHED ||
+ is_active(intf))
+ goto done;
- /* mark things as "on" immediately, no matter what errors crop up */
- dev->power.power_state.event = PM_EVENT_ON;
+ /* Don't let autoresume interfere with unbinding */
+ if (intf->condition == USB_INTERFACE_UNBINDING)
+ goto done;
- /* devices resume through their hubs */
- if (is_usb_device(dev)) {
- udev = to_usb_device(dev);
- if (udev->state == USB_STATE_NOTATTACHED)
- return 0;
- return usb_port_resume(udev);
+ /* Can't resume it if it doesn't have a driver. */
+ if (intf->condition == USB_INTERFACE_UNBOUND) {
+ status = -ENOTCONN;
+ goto done;
}
+ driver = to_usb_driver(intf->dev.driver);
- if (dev->driver == NULL) {
- dev->power.power_state.event = PM_EVENT_FREEZE;
- return 0;
+ if (driver->resume) {
+ status = driver->resume(intf);
+ if (status)
+ dev_err(&intf->dev, "%s error %d\n",
+ "resume", status);
+ else
+ mark_active(intf);
+ } else {
+ dev_warn(&intf->dev, "no resume for driver %s?\n",
+ driver->name);
+ mark_active(intf);
}
- intf = to_usb_interface(dev);
- driver = to_usb_driver(dev->driver);
+done:
+ // dev_dbg(&intf->dev, "%s: status %d\n", __FUNCTION__, status);
+ if (status == 0)
+ intf->dev.power.power_state.event = PM_EVENT_ON;
+ return status;
+}
- udev = interface_to_usbdev(intf);
+#ifdef CONFIG_USB_SUSPEND
+
+/* Internal routine to check whether we may autosuspend a device. */
+static int autosuspend_check(struct usb_device *udev)
+{
+ int i;
+ struct usb_interface *intf;
+
+ /* For autosuspend, fail fast if anything is in use.
+ * Also fail if any interfaces require remote wakeup but it
+ * isn't available. */
+ udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
+ if (udev->pm_usage_cnt > 0)
+ return -EBUSY;
+ if (udev->actconfig) {
+ for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
+ intf = udev->actconfig->interface[i];
+ if (!is_active(intf))
+ continue;
+ if (intf->pm_usage_cnt > 0)
+ return -EBUSY;
+ if (intf->needs_remote_wakeup &&
+ !udev->do_remote_wakeup) {
+ dev_dbg(&udev->dev, "remote wakeup needed "
+ "for autosuspend\n");
+ return -EOPNOTSUPP;
+ }
+ }
+ }
+ return 0;
+}
+
+#else
+
+#define autosuspend_check(udev) 0
+
+#endif
+
+/**
+ * usb_suspend_both - suspend a USB device and its interfaces
+ * @udev: the usb_device to suspend
+ * @msg: Power Management message describing this state transition
+ *
+ * This is the central routine for suspending USB devices. It calls the
+ * suspend methods for all the interface drivers in @udev and then calls
+ * the suspend method for @udev itself. If an error occurs at any stage,
+ * all the interfaces which were suspended are resumed so that they remain
+ * in the same state as the device.
+ *
+ * If an autosuspend is in progress (@udev->auto_pm is set), the routine
+ * checks first to make sure that neither the device itself or any of its
+ * active interfaces is in use (pm_usage_cnt is greater than 0). If they
+ * are, the autosuspend fails.
+ *
+ * If the suspend succeeds, the routine recursively queues an autosuspend
+ * request for @udev's parent device, thereby propagating the change up
+ * the device tree. If all of the parent's children are now suspended,
+ * the parent will autosuspend in turn.
+ *
+ * The suspend method calls are subject to mutual exclusion under control
+ * of @udev's pm_mutex. Many of these calls are also under the protection
+ * of @udev's device lock (including all requests originating outside the
+ * USB subsystem), but autosuspend requests generated by a child device or
+ * interface driver may not be. Usbcore will insure that the method calls
+ * do not arrive during bind, unbind, or reset operations. However, drivers
+ * must be prepared to handle suspend calls arriving at unpredictable times.
+ * The only way to block such calls is to do an autoresume (preventing
+ * autosuspends) while holding @udev's device lock (preventing outside
+ * suspends).
+ *
+ * The caller must hold @udev->pm_mutex.
+ *
+ * This routine can run only in process context.
+ */
+int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
+{
+ int status = 0;
+ int i = 0;
+ struct usb_interface *intf;
+ struct usb_device *parent = udev->parent;
+
+ cancel_delayed_work(&udev->autosuspend);
if (udev->state == USB_STATE_NOTATTACHED)
return 0;
+ if (udev->state == USB_STATE_SUSPENDED)
+ return 0;
- /* if driver was suspended, it has a resume method;
- * however, sysfs can wrongly mark things as suspended
- * (on the "no suspend method" FIXME path above)
- */
- if (driver->resume) {
- status = driver->resume(intf);
- if (status) {
- dev_err(dev, "%s error %d\n", "resume", status);
- mark_quiesced(intf);
+ udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
+
+ if (udev->auto_pm) {
+ status = autosuspend_check(udev);
+ if (status < 0)
+ return status;
+ }
+
+ /* Suspend all the interfaces and then udev itself */
+ if (udev->actconfig) {
+ for (; i < udev->actconfig->desc.bNumInterfaces; i++) {
+ intf = udev->actconfig->interface[i];
+ status = usb_suspend_interface(intf, msg);
+ if (status != 0)
+ break;
+ }
+ }
+ if (status == 0)
+ status = usb_suspend_device(udev, msg);
+
+ /* If the suspend failed, resume interfaces that did get suspended */
+ if (status != 0) {
+ while (--i >= 0) {
+ intf = udev->actconfig->interface[i];
+ usb_resume_interface(intf);
+ }
+
+ /* If the suspend succeeded, propagate it up the tree */
+ } else if (parent)
+ usb_autosuspend_device(parent);
+
+ // dev_dbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status);
+ return status;
+}
+
+/**
+ * usb_resume_both - resume a USB device and its interfaces
+ * @udev: the usb_device to resume
+ *
+ * This is the central routine for resuming USB devices. It calls the
+ * the resume method for @udev and then calls the resume methods for all
+ * the interface drivers in @udev.
+ *
+ * Before starting the resume, the routine calls itself recursively for
+ * the parent device of @udev, thereby propagating the change up the device
+ * tree and assuring that @udev will be able to resume. If the parent is
+ * unable to resume successfully, the routine fails.
+ *
+ * The resume method calls are subject to mutual exclusion under control
+ * of @udev's pm_mutex. Many of these calls are also under the protection
+ * of @udev's device lock (including all requests originating outside the
+ * USB subsystem), but autoresume requests generated by a child device or
+ * interface driver may not be. Usbcore will insure that the method calls
+ * do not arrive during bind, unbind, or reset operations. However, drivers
+ * must be prepared to handle resume calls arriving at unpredictable times.
+ * The only way to block such calls is to do an autoresume (preventing
+ * other autoresumes) while holding @udev's device lock (preventing outside
+ * resumes).
+ *
+ * The caller must hold @udev->pm_mutex.
+ *
+ * This routine can run only in process context.
+ */
+int usb_resume_both(struct usb_device *udev)
+{
+ int status = 0;
+ int i;
+ struct usb_interface *intf;
+ struct usb_device *parent = udev->parent;
+
+ cancel_delayed_work(&udev->autosuspend);
+ if (udev->state == USB_STATE_NOTATTACHED)
+ return -ENODEV;
+
+ /* Propagate the resume up the tree, if necessary */
+ if (udev->state == USB_STATE_SUSPENDED) {
+ if (parent) {
+ status = usb_autoresume_device(parent);
+ if (status == 0) {
+ status = usb_resume_device(udev);
+ if (status) {
+ usb_autosuspend_device(parent);
+
+ /* It's possible usb_resume_device()
+ * failed after the port was
+ * unsuspended, causing udev to be
+ * logically disconnected. We don't
+ * want usb_disconnect() to autosuspend
+ * the parent again, so tell it that
+ * udev disconnected while still
+ * suspended. */
+ if (udev->state ==
+ USB_STATE_NOTATTACHED)
+ udev->discon_suspended = 1;
+ }
+ }
+ } else {
+
+ /* We can't progagate beyond the USB subsystem,
+ * so if a root hub's controller is suspended
+ * then we're stuck. */
+ if (udev->dev.parent->power.power_state.event !=
+ PM_EVENT_ON)
+ status = -EHOSTUNREACH;
+ else
+ status = usb_resume_device(udev);
+ }
+ } else {
+
+ /* Needed only for setting udev->dev.power.power_state.event
+ * and for possible debugging message. */
+ status = usb_resume_device(udev);
+ }
+
+ if (status == 0 && udev->actconfig) {
+ for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
+ intf = udev->actconfig->interface[i];
+ usb_resume_interface(intf);
}
+ }
+
+ // dev_dbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status);
+ return status;
+}
+
+#ifdef CONFIG_USB_SUSPEND
+
+/* Internal routine to adjust a device's usage counter and change
+ * its autosuspend state.
+ */
+static int usb_autopm_do_device(struct usb_device *udev, int inc_usage_cnt)
+{
+ int status = 0;
+
+ usb_pm_lock(udev);
+ udev->pm_usage_cnt += inc_usage_cnt;
+ WARN_ON(udev->pm_usage_cnt < 0);
+ if (inc_usage_cnt >= 0 && udev->pm_usage_cnt > 0) {
+ udev->auto_pm = 1;
+ status = usb_resume_both(udev);
+ if (status != 0)
+ udev->pm_usage_cnt -= inc_usage_cnt;
+ } else if (inc_usage_cnt <= 0 && autosuspend_check(udev) == 0)
+ queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
+ USB_AUTOSUSPEND_DELAY);
+ usb_pm_unlock(udev);
+ return status;
+}
+
+/**
+ * usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces
+ * @udev: the usb_device to autosuspend
+ *
+ * This routine should be called when a core subsystem is finished using
+ * @udev and wants to allow it to autosuspend. Examples would be when
+ * @udev's device file in usbfs is closed or after a configuration change.
+ *
+ * @udev's usage counter is decremented. If it or any of the usage counters
+ * for an active interface is greater than 0, no autosuspend request will be
+ * queued. (If an interface driver does not support autosuspend then its
+ * usage counter is permanently positive.) Furthermore, if an interface
+ * driver requires remote-wakeup capability during autosuspend but remote
+ * wakeup is disabled, the autosuspend will fail.
+ *
+ * Often the caller will hold @udev's device lock, but this is not
+ * necessary.
+ *
+ * This routine can run only in process context.
+ */
+void usb_autosuspend_device(struct usb_device *udev)
+{
+ int status;
+
+ status = usb_autopm_do_device(udev, -1);
+ // dev_dbg(&udev->dev, "%s: cnt %d\n",
+ // __FUNCTION__, udev->pm_usage_cnt);
+}
+
+/**
+ * usb_autoresume_device - immediately autoresume a USB device and its interfaces
+ * @udev: the usb_device to autoresume
+ *
+ * This routine should be called when a core subsystem wants to use @udev
+ * and needs to guarantee that it is not suspended. No autosuspend will
+ * occur until usb_autosuspend_device is called. (Note that this will not
+ * prevent suspend events originating in the PM core.) Examples would be
+ * when @udev's device file in usbfs is opened or when a remote-wakeup
+ * request is received.
+ *
+ * @udev's usage counter is incremented to prevent subsequent autosuspends.
+ * However if the autoresume fails then the usage counter is re-decremented.
+ *
+ * Often the caller will hold @udev's device lock, but this is not
+ * necessary (and attempting it might cause deadlock).
+ *
+ * This routine can run only in process context.
+ */
+int usb_autoresume_device(struct usb_device *udev)
+{
+ int status;
+
+ status = usb_autopm_do_device(udev, 1);
+ // dev_dbg(&udev->dev, "%s: status %d cnt %d\n",
+ // __FUNCTION__, status, udev->pm_usage_cnt);
+ return status;
+}
+
+/* Internal routine to adjust an interface's usage counter and change
+ * its device's autosuspend state.
+ */
+static int usb_autopm_do_interface(struct usb_interface *intf,
+ int inc_usage_cnt)
+{
+ struct usb_device *udev = interface_to_usbdev(intf);
+ int status = 0;
+
+ usb_pm_lock(udev);
+ if (intf->condition == USB_INTERFACE_UNBOUND)
+ status = -ENODEV;
+ else {
+ intf->pm_usage_cnt += inc_usage_cnt;
+ if (inc_usage_cnt >= 0 && intf->pm_usage_cnt > 0) {
+ udev->auto_pm = 1;
+ status = usb_resume_both(udev);
+ if (status != 0)
+ intf->pm_usage_cnt -= inc_usage_cnt;
+ } else if (inc_usage_cnt <= 0 && autosuspend_check(udev) == 0)
+ queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
+ USB_AUTOSUSPEND_DELAY);
+ }
+ usb_pm_unlock(udev);
+ return status;
+}
+
+/**
+ * usb_autopm_put_interface - decrement a USB interface's PM-usage counter
+ * @intf: the usb_interface whose counter should be decremented
+ *
+ * This routine should be called by an interface driver when it is
+ * finished using @intf and wants to allow it to autosuspend. A typical
+ * example would be a character-device driver when its device file is
+ * closed.
+ *
+ * The routine decrements @intf's usage counter. When the counter reaches
+ * 0, a delayed autosuspend request for @intf's device is queued. When
+ * the delay expires, if @intf->pm_usage_cnt is still <= 0 along with all
+ * the other usage counters for the sibling interfaces and @intf's
+ * usb_device, the device and all its interfaces will be autosuspended.
+ *
+ * Note that @intf->pm_usage_cnt is owned by the interface driver. The
+ * core will not change its value other than the increment and decrement
+ * in usb_autopm_get_interface and usb_autopm_put_interface. The driver
+ * may use this simple counter-oriented discipline or may set the value
+ * any way it likes.
+ *
+ * If the driver has set @intf->needs_remote_wakeup then autosuspend will
+ * take place only if the device's remote-wakeup facility is enabled.
+ *
+ * Suspend method calls queued by this routine can arrive at any time
+ * while @intf is resumed and its usage counter is equal to 0. They are
+ * not protected by the usb_device's lock but only by its pm_mutex.
+ * Drivers must provide their own synchronization.
+ *
+ * This routine can run only in process context.
+ */
+void usb_autopm_put_interface(struct usb_interface *intf)
+{
+ int status;
+
+ status = usb_autopm_do_interface(intf, -1);
+ // dev_dbg(&intf->dev, "%s: status %d cnt %d\n",
+ // __FUNCTION__, status, intf->pm_usage_cnt);
+}
+EXPORT_SYMBOL_GPL(usb_autopm_put_interface);
+
+/**
+ * usb_autopm_get_interface - increment a USB interface's PM-usage counter
+ * @intf: the usb_interface whose counter should be incremented
+ *
+ * This routine should be called by an interface driver when it wants to
+ * use @intf and needs to guarantee that it is not suspended. In addition,
+ * the routine prevents @intf from being autosuspended subsequently. (Note
+ * that this will not prevent suspend events originating in the PM core.)
+ * This prevention will persist until usb_autopm_put_interface() is called
+ * or @intf is unbound. A typical example would be a character-device
+ * driver when its device file is opened.
+ *
+ * The routine increments @intf's usage counter. So long as the counter
+ * is greater than 0, autosuspend will not be allowed for @intf or its
+ * usb_device. When the driver is finished using @intf it should call
+ * usb_autopm_put_interface() to decrement the usage counter and queue
+ * a delayed autosuspend request (if the counter is <= 0).
+ *
+ * Note that @intf->pm_usage_cnt is owned by the interface driver. The
+ * core will not change its value other than the increment and decrement
+ * in usb_autopm_get_interface and usb_autopm_put_interface. The driver
+ * may use this simple counter-oriented discipline or may set the value
+ * any way it likes.
+ *
+ * Resume method calls generated by this routine can arrive at any time
+ * while @intf is suspended. They are not protected by the usb_device's
+ * lock but only by its pm_mutex. Drivers must provide their own
+ * synchronization.
+ *
+ * This routine can run only in process context.
+ */
+int usb_autopm_get_interface(struct usb_interface *intf)
+{
+ int status;
+
+ status = usb_autopm_do_interface(intf, 1);
+ // dev_dbg(&intf->dev, "%s: status %d cnt %d\n",
+ // __FUNCTION__, status, intf->pm_usage_cnt);
+ return status;
+}
+EXPORT_SYMBOL_GPL(usb_autopm_get_interface);
+
+/**
+ * usb_autopm_set_interface - set a USB interface's autosuspend state
+ * @intf: the usb_interface whose state should be set
+ *
+ * This routine sets the autosuspend state of @intf's device according
+ * to @intf's usage counter, which the caller must have set previously.
+ * If the counter is <= 0, the device is autosuspended (if it isn't
+ * already suspended and if nothing else prevents the autosuspend). If
+ * the counter is > 0, the device is autoresumed (if it isn't already
+ * awake).
+ */
+int usb_autopm_set_interface(struct usb_interface *intf)
+{
+ int status;
+
+ status = usb_autopm_do_interface(intf, 0);
+ // dev_dbg(&intf->dev, "%s: status %d cnt %d\n",
+ // __FUNCTION__, status, intf->pm_usage_cnt);
+ return status;
+}
+EXPORT_SYMBOL_GPL(usb_autopm_set_interface);
+
+#endif /* CONFIG_USB_SUSPEND */
+
+static int usb_suspend(struct device *dev, pm_message_t message)
+{
+ int status;
+
+ if (is_usb_device(dev)) {
+ struct usb_device *udev = to_usb_device(dev);
+
+ usb_pm_lock(udev);
+ udev->auto_pm = 0;
+ status = usb_suspend_both(udev, message);
+ usb_pm_unlock(udev);
} else
- dev_warn(dev, "no resume for driver %s?\n", driver->name);
- return 0;
+ status = 0;
+ return status;
+}
+
+static int usb_resume(struct device *dev)
+{
+ int status;
+
+ if (is_usb_device(dev)) {
+ struct usb_device *udev = to_usb_device(dev);
+
+ usb_pm_lock(udev);
+ udev->auto_pm = 0;
+ status = usb_resume_both(udev);
+ usb_pm_unlock(udev);
+
+ /* Rebind drivers that had no suspend method? */
+ } else
+ status = 0;
+ return status;
}
#endif /* CONFIG_PM */
.match = usb_device_match,
.uevent = usb_uevent,
#ifdef CONFIG_PM
- .suspend = usb_generic_suspend,
- .resume = usb_generic_resume,
+ .suspend = usb_suspend,
+ .resume = usb_resume,
#endif
};
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff