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24c0996a6b
When a driver unbinds from an interface, usbcore always sends a Set-Interface request to reinstall altsetting 0. Unforunately, quite a few devices have buggy firmware that crashes when it receives this request. To avoid such problems, this patch (as1180) arranges to send the Set-Interface request only when the interface is not already in altsetting 0. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1669 lines
50 KiB
C
1669 lines
50 KiB
C
/*
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* drivers/usb/driver.c - most of the driver model stuff for usb
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*
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* (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
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*
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* based on drivers/usb/usb.c which had the following copyrights:
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* (C) Copyright Linus Torvalds 1999
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* (C) Copyright Johannes Erdfelt 1999-2001
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* (C) Copyright Andreas Gal 1999
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* (C) Copyright Gregory P. Smith 1999
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* (C) Copyright Deti Fliegl 1999 (new USB architecture)
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* (C) Copyright Randy Dunlap 2000
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* (C) Copyright David Brownell 2000-2004
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* (C) Copyright Yggdrasil Computing, Inc. 2000
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* (usb_device_id matching changes by Adam J. Richter)
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* (C) Copyright Greg Kroah-Hartman 2002-2003
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*
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* NOTE! This is not actually a driver at all, rather this is
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* just a collection of helper routines that implement the
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* matching, probing, releasing, suspending and resuming for
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* real drivers.
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*
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*/
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#include <linux/device.h>
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#include <linux/usb.h>
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#include <linux/usb/quirks.h>
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#include <linux/workqueue.h>
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#include "hcd.h"
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#include "usb.h"
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#ifdef CONFIG_HOTPLUG
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/*
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* Adds a new dynamic USBdevice ID to this driver,
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* and cause the driver to probe for all devices again.
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*/
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ssize_t usb_store_new_id(struct usb_dynids *dynids,
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struct device_driver *driver,
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const char *buf, size_t count)
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{
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struct usb_dynid *dynid;
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u32 idVendor = 0;
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u32 idProduct = 0;
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int fields = 0;
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int retval = 0;
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fields = sscanf(buf, "%x %x", &idVendor, &idProduct);
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if (fields < 2)
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return -EINVAL;
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dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
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if (!dynid)
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return -ENOMEM;
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INIT_LIST_HEAD(&dynid->node);
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dynid->id.idVendor = idVendor;
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dynid->id.idProduct = idProduct;
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dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE;
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spin_lock(&dynids->lock);
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list_add_tail(&dynid->node, &dynids->list);
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spin_unlock(&dynids->lock);
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if (get_driver(driver)) {
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retval = driver_attach(driver);
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put_driver(driver);
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}
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if (retval)
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return retval;
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return count;
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}
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EXPORT_SYMBOL_GPL(usb_store_new_id);
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static ssize_t store_new_id(struct device_driver *driver,
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const char *buf, size_t count)
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{
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struct usb_driver *usb_drv = to_usb_driver(driver);
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return usb_store_new_id(&usb_drv->dynids, driver, buf, count);
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}
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static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
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static int usb_create_newid_file(struct usb_driver *usb_drv)
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{
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int error = 0;
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if (usb_drv->no_dynamic_id)
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goto exit;
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if (usb_drv->probe != NULL)
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error = driver_create_file(&usb_drv->drvwrap.driver,
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&driver_attr_new_id);
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exit:
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return error;
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}
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static void usb_remove_newid_file(struct usb_driver *usb_drv)
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{
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if (usb_drv->no_dynamic_id)
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return;
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if (usb_drv->probe != NULL)
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driver_remove_file(&usb_drv->drvwrap.driver,
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&driver_attr_new_id);
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}
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static void usb_free_dynids(struct usb_driver *usb_drv)
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{
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struct usb_dynid *dynid, *n;
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spin_lock(&usb_drv->dynids.lock);
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list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) {
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list_del(&dynid->node);
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kfree(dynid);
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}
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spin_unlock(&usb_drv->dynids.lock);
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}
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#else
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static inline int usb_create_newid_file(struct usb_driver *usb_drv)
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{
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return 0;
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}
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static void usb_remove_newid_file(struct usb_driver *usb_drv)
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{
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}
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static inline void usb_free_dynids(struct usb_driver *usb_drv)
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{
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}
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#endif
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static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf,
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struct usb_driver *drv)
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{
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struct usb_dynid *dynid;
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spin_lock(&drv->dynids.lock);
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list_for_each_entry(dynid, &drv->dynids.list, node) {
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if (usb_match_one_id(intf, &dynid->id)) {
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spin_unlock(&drv->dynids.lock);
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return &dynid->id;
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}
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}
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spin_unlock(&drv->dynids.lock);
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return NULL;
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}
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/* called from driver core with dev locked */
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static int usb_probe_device(struct device *dev)
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{
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struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
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struct usb_device *udev;
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int error = -ENODEV;
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dev_dbg(dev, "%s\n", __func__);
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if (!is_usb_device(dev)) /* Sanity check */
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return error;
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udev = to_usb_device(dev);
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/* TODO: Add real matching code */
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/* The device should always appear to be in use
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* unless the driver suports autosuspend.
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*/
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udev->pm_usage_cnt = !(udriver->supports_autosuspend);
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error = udriver->probe(udev);
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return error;
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}
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/* called from driver core with dev locked */
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static int usb_unbind_device(struct device *dev)
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{
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struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
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udriver->disconnect(to_usb_device(dev));
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return 0;
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}
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/* called from driver core with dev locked */
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static int usb_probe_interface(struct device *dev)
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{
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struct usb_driver *driver = to_usb_driver(dev->driver);
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struct usb_interface *intf;
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struct usb_device *udev;
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const struct usb_device_id *id;
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int error = -ENODEV;
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dev_dbg(dev, "%s\n", __func__);
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if (is_usb_device(dev)) /* Sanity check */
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return error;
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intf = to_usb_interface(dev);
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udev = interface_to_usbdev(intf);
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intf->needs_binding = 0;
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if (udev->authorized == 0) {
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dev_err(&intf->dev, "Device is not authorized for usage\n");
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return -ENODEV;
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}
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id = usb_match_id(intf, driver->id_table);
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if (!id)
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id = usb_match_dynamic_id(intf, driver);
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if (id) {
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dev_dbg(dev, "%s - got id\n", __func__);
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error = usb_autoresume_device(udev);
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if (error)
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return error;
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/* Interface "power state" doesn't correspond to any hardware
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* state whatsoever. We use it to record when it's bound to
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* a driver that may start I/0: it's not frozen/quiesced.
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*/
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mark_active(intf);
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intf->condition = USB_INTERFACE_BINDING;
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/* The interface should always appear to be in use
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* unless the driver suports autosuspend.
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*/
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intf->pm_usage_cnt = !(driver->supports_autosuspend);
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/* Carry out a deferred switch to altsetting 0 */
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if (intf->needs_altsetting0) {
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usb_set_interface(udev, intf->altsetting[0].
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desc.bInterfaceNumber, 0);
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intf->needs_altsetting0 = 0;
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}
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error = driver->probe(intf, id);
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if (error) {
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mark_quiesced(intf);
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intf->needs_remote_wakeup = 0;
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intf->condition = USB_INTERFACE_UNBOUND;
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} else
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intf->condition = USB_INTERFACE_BOUND;
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usb_autosuspend_device(udev);
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}
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return error;
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}
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/* called from driver core with dev locked */
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static int usb_unbind_interface(struct device *dev)
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{
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struct usb_driver *driver = to_usb_driver(dev->driver);
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_device *udev;
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int error;
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intf->condition = USB_INTERFACE_UNBINDING;
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/* Autoresume for set_interface call below */
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udev = interface_to_usbdev(intf);
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error = usb_autoresume_device(udev);
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/* Terminate all URBs for this interface unless the driver
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* supports "soft" unbinding.
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*/
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if (!driver->soft_unbind)
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usb_disable_interface(udev, intf);
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driver->disconnect(intf);
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/* Reset other interface state.
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* We cannot do a Set-Interface if the device is suspended or
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* if it is prepared for a system sleep (since installing a new
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* altsetting means creating new endpoint device entries).
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* When either of these happens, defer the Set-Interface.
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*/
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if (intf->cur_altsetting->desc.bAlternateSetting == 0)
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; /* Already in altsetting 0 so skip Set-Interface */
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else if (!error && intf->dev.power.status == DPM_ON)
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usb_set_interface(udev, intf->altsetting[0].
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desc.bInterfaceNumber, 0);
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else
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intf->needs_altsetting0 = 1;
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usb_set_intfdata(intf, NULL);
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intf->condition = USB_INTERFACE_UNBOUND;
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mark_quiesced(intf);
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intf->needs_remote_wakeup = 0;
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if (!error)
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usb_autosuspend_device(udev);
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return 0;
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}
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/**
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* usb_driver_claim_interface - bind a driver to an interface
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* @driver: the driver to be bound
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* @iface: the interface to which it will be bound; must be in the
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* usb device's active configuration
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* @priv: driver data associated with that interface
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*
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* This is used by usb device drivers that need to claim more than one
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* interface on a device when probing (audio and acm are current examples).
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* No device driver should directly modify internal usb_interface or
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* usb_device structure members.
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*
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* Few drivers should need to use this routine, since the most natural
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* way to bind to an interface is to return the private data from
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* the driver's probe() method.
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*
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* Callers must own the device lock, so driver probe() entries don't need
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* extra locking, but other call contexts may need to explicitly claim that
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* lock.
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*/
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int usb_driver_claim_interface(struct usb_driver *driver,
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struct usb_interface *iface, void *priv)
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{
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struct device *dev = &iface->dev;
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struct usb_device *udev = interface_to_usbdev(iface);
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int retval = 0;
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if (dev->driver)
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return -EBUSY;
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dev->driver = &driver->drvwrap.driver;
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usb_set_intfdata(iface, priv);
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iface->needs_binding = 0;
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usb_pm_lock(udev);
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iface->condition = USB_INTERFACE_BOUND;
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mark_active(iface);
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iface->pm_usage_cnt = !(driver->supports_autosuspend);
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usb_pm_unlock(udev);
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/* if interface was already added, bind now; else let
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* the future device_add() bind it, bypassing probe()
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*/
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if (device_is_registered(dev))
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retval = device_bind_driver(dev);
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return retval;
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}
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EXPORT_SYMBOL_GPL(usb_driver_claim_interface);
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/**
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* usb_driver_release_interface - unbind a driver from an interface
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* @driver: the driver to be unbound
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* @iface: the interface from which it will be unbound
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*
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* This can be used by drivers to release an interface without waiting
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* for their disconnect() methods to be called. In typical cases this
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* also causes the driver disconnect() method to be called.
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*
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* This call is synchronous, and may not be used in an interrupt context.
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* Callers must own the device lock, so driver disconnect() entries don't
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* need extra locking, but other call contexts may need to explicitly claim
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* that lock.
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*/
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void usb_driver_release_interface(struct usb_driver *driver,
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struct usb_interface *iface)
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{
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struct device *dev = &iface->dev;
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struct usb_device *udev = interface_to_usbdev(iface);
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/* this should never happen, don't release something that's not ours */
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if (!dev->driver || dev->driver != &driver->drvwrap.driver)
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return;
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/* don't release from within disconnect() */
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if (iface->condition != USB_INTERFACE_BOUND)
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return;
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/* don't release if the interface hasn't been added yet */
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if (device_is_registered(dev)) {
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iface->condition = USB_INTERFACE_UNBINDING;
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device_release_driver(dev);
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}
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dev->driver = NULL;
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usb_set_intfdata(iface, NULL);
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usb_pm_lock(udev);
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iface->condition = USB_INTERFACE_UNBOUND;
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mark_quiesced(iface);
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iface->needs_remote_wakeup = 0;
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usb_pm_unlock(udev);
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}
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EXPORT_SYMBOL_GPL(usb_driver_release_interface);
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/* returns 0 if no match, 1 if match */
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int usb_match_device(struct usb_device *dev, const struct usb_device_id *id)
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{
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if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
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id->idVendor != le16_to_cpu(dev->descriptor.idVendor))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
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id->idProduct != le16_to_cpu(dev->descriptor.idProduct))
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return 0;
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/* No need to test id->bcdDevice_lo != 0, since 0 is never
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greater than any unsigned number. */
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if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
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(id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice)))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
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(id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice)))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
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(id->bDeviceClass != dev->descriptor.bDeviceClass))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
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(id->bDeviceSubClass != dev->descriptor.bDeviceSubClass))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
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(id->bDeviceProtocol != dev->descriptor.bDeviceProtocol))
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return 0;
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return 1;
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}
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/* returns 0 if no match, 1 if match */
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int usb_match_one_id(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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struct usb_host_interface *intf;
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struct usb_device *dev;
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/* proc_connectinfo in devio.c may call us with id == NULL. */
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if (id == NULL)
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return 0;
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intf = interface->cur_altsetting;
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dev = interface_to_usbdev(interface);
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if (!usb_match_device(dev, id))
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return 0;
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/* The interface class, subclass, and protocol should never be
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* checked for a match if the device class is Vendor Specific,
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* unless the match record specifies the Vendor ID. */
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if (dev->descriptor.bDeviceClass == USB_CLASS_VENDOR_SPEC &&
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!(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
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(id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
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USB_DEVICE_ID_MATCH_INT_SUBCLASS |
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USB_DEVICE_ID_MATCH_INT_PROTOCOL)))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
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(id->bInterfaceClass != intf->desc.bInterfaceClass))
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return 0;
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if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
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(id->bInterfaceSubClass != intf->desc.bInterfaceSubClass))
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return 0;
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|
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if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
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(id->bInterfaceProtocol != intf->desc.bInterfaceProtocol))
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return 0;
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return 1;
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}
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EXPORT_SYMBOL_GPL(usb_match_one_id);
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|
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/**
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* usb_match_id - find first usb_device_id matching device or interface
|
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* @interface: the interface of interest
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* @id: array of usb_device_id structures, terminated by zero entry
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*
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* usb_match_id searches an array of usb_device_id's and returns
|
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* the first one matching the device or interface, or null.
|
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* This is used when binding (or rebinding) a driver to an interface.
|
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* Most USB device drivers will use this indirectly, through the usb core,
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* but some layered driver frameworks use it directly.
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|
* These device tables are exported with MODULE_DEVICE_TABLE, through
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|
* modutils, to support the driver loading functionality of USB hotplugging.
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|
*
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|
* What Matches:
|
|
*
|
|
* The "match_flags" element in a usb_device_id controls which
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* members are used. If the corresponding bit is set, the
|
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* value in the device_id must match its corresponding member
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* in the device or interface descriptor, or else the device_id
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* does not match.
|
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*
|
|
* "driver_info" is normally used only by device drivers,
|
|
* but you can create a wildcard "matches anything" usb_device_id
|
|
* as a driver's "modules.usbmap" entry if you provide an id with
|
|
* only a nonzero "driver_info" field. If you do this, the USB device
|
|
* driver's probe() routine should use additional intelligence to
|
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* decide whether to bind to the specified interface.
|
|
*
|
|
* What Makes Good usb_device_id Tables:
|
|
*
|
|
* The match algorithm is very simple, so that intelligence in
|
|
* driver selection must come from smart driver id records.
|
|
* Unless you have good reasons to use another selection policy,
|
|
* provide match elements only in related groups, and order match
|
|
* specifiers from specific to general. Use the macros provided
|
|
* for that purpose if you can.
|
|
*
|
|
* The most specific match specifiers use device descriptor
|
|
* data. These are commonly used with product-specific matches;
|
|
* the USB_DEVICE macro lets you provide vendor and product IDs,
|
|
* and you can also match against ranges of product revisions.
|
|
* These are widely used for devices with application or vendor
|
|
* specific bDeviceClass values.
|
|
*
|
|
* Matches based on device class/subclass/protocol specifications
|
|
* are slightly more general; use the USB_DEVICE_INFO macro, or
|
|
* its siblings. These are used with single-function devices
|
|
* where bDeviceClass doesn't specify that each interface has
|
|
* its own class.
|
|
*
|
|
* Matches based on interface class/subclass/protocol are the
|
|
* 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 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
|
|
* without vendor and product IDs; or specify a protocol without
|
|
* its associated class and subclass.
|
|
*/
|
|
const struct usb_device_id *usb_match_id(struct usb_interface *interface,
|
|
const struct usb_device_id *id)
|
|
{
|
|
/* proc_connectinfo in devio.c may call us with id == NULL. */
|
|
if (id == NULL)
|
|
return NULL;
|
|
|
|
/* It is important to check that id->driver_info is nonzero,
|
|
since an entry that is all zeroes except for a nonzero
|
|
id->driver_info is the way to create an entry that
|
|
indicates that the driver want to examine every
|
|
device and interface. */
|
|
for (; id->idVendor || id->idProduct || id->bDeviceClass ||
|
|
id->bInterfaceClass || id->driver_info; id++) {
|
|
if (usb_match_one_id(interface, id))
|
|
return id;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_match_id);
|
|
|
|
static int usb_device_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
/* devices and interfaces are handled separately */
|
|
if (is_usb_device(dev)) {
|
|
|
|
/* interface drivers never match devices */
|
|
if (!is_usb_device_driver(drv))
|
|
return 0;
|
|
|
|
/* TODO: Add real matching code */
|
|
return 1;
|
|
|
|
} else {
|
|
struct usb_interface *intf;
|
|
struct usb_driver *usb_drv;
|
|
const struct usb_device_id *id;
|
|
|
|
/* device drivers never match interfaces */
|
|
if (is_usb_device_driver(drv))
|
|
return 0;
|
|
|
|
intf = to_usb_interface(dev);
|
|
usb_drv = to_usb_driver(drv);
|
|
|
|
id = usb_match_id(intf, usb_drv->id_table);
|
|
if (id)
|
|
return 1;
|
|
|
|
id = usb_match_dynamic_id(intf, usb_drv);
|
|
if (id)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG
|
|
static int usb_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct usb_device *usb_dev;
|
|
|
|
/* driver is often null here; dev_dbg() would oops */
|
|
pr_debug("usb %s: uevent\n", dev_name(dev));
|
|
|
|
if (is_usb_device(dev))
|
|
usb_dev = to_usb_device(dev);
|
|
else {
|
|
struct usb_interface *intf = to_usb_interface(dev);
|
|
usb_dev = interface_to_usbdev(intf);
|
|
}
|
|
|
|
if (usb_dev->devnum < 0) {
|
|
pr_debug("usb %s: already deleted?\n", dev_name(dev));
|
|
return -ENODEV;
|
|
}
|
|
if (!usb_dev->bus) {
|
|
pr_debug("usb %s: bus removed?\n", dev_name(dev));
|
|
return -ENODEV;
|
|
}
|
|
|
|
#ifdef CONFIG_USB_DEVICEFS
|
|
/* If this is available, userspace programs can directly read
|
|
* all the device descriptors we don't tell them about. Or
|
|
* act as usermode drivers.
|
|
*/
|
|
if (add_uevent_var(env, "DEVICE=/proc/bus/usb/%03d/%03d",
|
|
usb_dev->bus->busnum, usb_dev->devnum))
|
|
return -ENOMEM;
|
|
#endif
|
|
|
|
/* per-device configurations are common */
|
|
if (add_uevent_var(env, "PRODUCT=%x/%x/%x",
|
|
le16_to_cpu(usb_dev->descriptor.idVendor),
|
|
le16_to_cpu(usb_dev->descriptor.idProduct),
|
|
le16_to_cpu(usb_dev->descriptor.bcdDevice)))
|
|
return -ENOMEM;
|
|
|
|
/* class-based driver binding models */
|
|
if (add_uevent_var(env, "TYPE=%d/%d/%d",
|
|
usb_dev->descriptor.bDeviceClass,
|
|
usb_dev->descriptor.bDeviceSubClass,
|
|
usb_dev->descriptor.bDeviceProtocol))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
|
|
static int usb_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
#endif /* CONFIG_HOTPLUG */
|
|
|
|
/**
|
|
* usb_register_device_driver - register a USB device (not interface) driver
|
|
* @new_udriver: USB operations for the device driver
|
|
* @owner: module owner of this driver.
|
|
*
|
|
* Registers a USB device driver with the USB core. The list of
|
|
* unattached devices will be rescanned whenever a new driver is
|
|
* added, allowing the new driver to attach to any recognized devices.
|
|
* Returns a negative error code on failure and 0 on success.
|
|
*/
|
|
int usb_register_device_driver(struct usb_device_driver *new_udriver,
|
|
struct module *owner)
|
|
{
|
|
int retval = 0;
|
|
|
|
if (usb_disabled())
|
|
return -ENODEV;
|
|
|
|
new_udriver->drvwrap.for_devices = 1;
|
|
new_udriver->drvwrap.driver.name = (char *) new_udriver->name;
|
|
new_udriver->drvwrap.driver.bus = &usb_bus_type;
|
|
new_udriver->drvwrap.driver.probe = usb_probe_device;
|
|
new_udriver->drvwrap.driver.remove = usb_unbind_device;
|
|
new_udriver->drvwrap.driver.owner = owner;
|
|
|
|
retval = driver_register(&new_udriver->drvwrap.driver);
|
|
|
|
if (!retval) {
|
|
pr_info("%s: registered new device driver %s\n",
|
|
usbcore_name, new_udriver->name);
|
|
usbfs_update_special();
|
|
} else {
|
|
printk(KERN_ERR "%s: error %d registering device "
|
|
" driver %s\n",
|
|
usbcore_name, retval, new_udriver->name);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_register_device_driver);
|
|
|
|
/**
|
|
* usb_deregister_device_driver - unregister a USB device (not interface) driver
|
|
* @udriver: USB operations of the device driver to unregister
|
|
* Context: must be able to sleep
|
|
*
|
|
* Unlinks the specified driver from the internal USB driver list.
|
|
*/
|
|
void usb_deregister_device_driver(struct usb_device_driver *udriver)
|
|
{
|
|
pr_info("%s: deregistering device driver %s\n",
|
|
usbcore_name, udriver->name);
|
|
|
|
driver_unregister(&udriver->drvwrap.driver);
|
|
usbfs_update_special();
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_deregister_device_driver);
|
|
|
|
/**
|
|
* 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
|
|
* added, allowing the new driver to attach to any recognized interfaces.
|
|
* Returns a negative error code on failure and 0 on success.
|
|
*
|
|
* NOTE: if you want your driver to use the USB major number, you must call
|
|
* 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,
|
|
const char *mod_name)
|
|
{
|
|
int retval = 0;
|
|
|
|
if (usb_disabled())
|
|
return -ENODEV;
|
|
|
|
new_driver->drvwrap.for_devices = 0;
|
|
new_driver->drvwrap.driver.name = (char *) new_driver->name;
|
|
new_driver->drvwrap.driver.bus = &usb_bus_type;
|
|
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);
|
|
|
|
retval = driver_register(&new_driver->drvwrap.driver);
|
|
|
|
if (!retval) {
|
|
pr_info("%s: registered new interface driver %s\n",
|
|
usbcore_name, new_driver->name);
|
|
usbfs_update_special();
|
|
usb_create_newid_file(new_driver);
|
|
} else {
|
|
printk(KERN_ERR "%s: error %d registering interface "
|
|
" driver %s\n",
|
|
usbcore_name, retval, new_driver->name);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_register_driver);
|
|
|
|
/**
|
|
* usb_deregister - unregister a USB interface driver
|
|
* @driver: USB operations of the interface driver to unregister
|
|
* Context: must be able to sleep
|
|
*
|
|
* Unlinks the specified driver from the internal USB driver list.
|
|
*
|
|
* NOTE: If you called usb_register_dev(), you still need to call
|
|
* usb_deregister_dev() to clean up your driver's allocated minor numbers,
|
|
* this * call will no longer do it for you.
|
|
*/
|
|
void usb_deregister(struct usb_driver *driver)
|
|
{
|
|
pr_info("%s: deregistering interface driver %s\n",
|
|
usbcore_name, driver->name);
|
|
|
|
usb_remove_newid_file(driver);
|
|
usb_free_dynids(driver);
|
|
driver_unregister(&driver->drvwrap.driver);
|
|
|
|
usbfs_update_special();
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_deregister);
|
|
|
|
/* Forced unbinding of a USB interface driver, either because
|
|
* it doesn't support pre_reset/post_reset/reset_resume or
|
|
* because it doesn't support suspend/resume.
|
|
*
|
|
* The caller must hold @intf's device's lock, but not its pm_mutex
|
|
* and not @intf->dev.sem.
|
|
*/
|
|
void usb_forced_unbind_intf(struct usb_interface *intf)
|
|
{
|
|
struct usb_driver *driver = to_usb_driver(intf->dev.driver);
|
|
|
|
dev_dbg(&intf->dev, "forced unbind\n");
|
|
usb_driver_release_interface(driver, intf);
|
|
|
|
/* Mark the interface for later rebinding */
|
|
intf->needs_binding = 1;
|
|
}
|
|
|
|
/* Delayed forced unbinding of a USB interface driver and scan
|
|
* for rebinding.
|
|
*
|
|
* The caller must hold @intf's device's lock, but not its pm_mutex
|
|
* and not @intf->dev.sem.
|
|
*
|
|
* Note: Rebinds will be skipped if a system sleep transition is in
|
|
* progress and the PM "complete" callback hasn't occurred yet.
|
|
*/
|
|
void usb_rebind_intf(struct usb_interface *intf)
|
|
{
|
|
int rc;
|
|
|
|
/* Delayed unbind of an existing driver */
|
|
if (intf->dev.driver) {
|
|
struct usb_driver *driver =
|
|
to_usb_driver(intf->dev.driver);
|
|
|
|
dev_dbg(&intf->dev, "forced unbind\n");
|
|
usb_driver_release_interface(driver, intf);
|
|
}
|
|
|
|
/* Try to rebind the interface */
|
|
if (intf->dev.power.status == DPM_ON) {
|
|
intf->needs_binding = 0;
|
|
rc = device_attach(&intf->dev);
|
|
if (rc < 0)
|
|
dev_warn(&intf->dev, "rebind failed: %d\n", rc);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
#define DO_UNBIND 0
|
|
#define DO_REBIND 1
|
|
|
|
/* Unbind drivers for @udev's interfaces that don't support suspend/resume,
|
|
* or rebind interfaces that have been unbound, according to @action.
|
|
*
|
|
* The caller must hold @udev's device lock.
|
|
*/
|
|
static void do_unbind_rebind(struct usb_device *udev, int action)
|
|
{
|
|
struct usb_host_config *config;
|
|
int i;
|
|
struct usb_interface *intf;
|
|
struct usb_driver *drv;
|
|
|
|
config = udev->actconfig;
|
|
if (config) {
|
|
for (i = 0; i < config->desc.bNumInterfaces; ++i) {
|
|
intf = config->interface[i];
|
|
switch (action) {
|
|
case DO_UNBIND:
|
|
if (intf->dev.driver) {
|
|
drv = to_usb_driver(intf->dev.driver);
|
|
if (!drv->suspend || !drv->resume)
|
|
usb_forced_unbind_intf(intf);
|
|
}
|
|
break;
|
|
case DO_REBIND:
|
|
if (intf->needs_binding)
|
|
usb_rebind_intf(intf);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Caller has locked udev's pm_mutex */
|
|
static int usb_suspend_device(struct usb_device *udev, pm_message_t msg)
|
|
{
|
|
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 generic suspend. */
|
|
if (udev->dev.driver)
|
|
udriver = to_usb_device_driver(udev->dev.driver);
|
|
else {
|
|
udev->do_remote_wakeup = 0;
|
|
udriver = &usb_generic_driver;
|
|
}
|
|
status = udriver->suspend(udev, msg);
|
|
|
|
done:
|
|
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
|
|
return status;
|
|
}
|
|
|
|
/* Caller has locked udev's pm_mutex */
|
|
static int usb_resume_device(struct usb_device *udev)
|
|
{
|
|
struct usb_device_driver *udriver;
|
|
int status = 0;
|
|
|
|
if (udev->state == USB_STATE_NOTATTACHED)
|
|
goto done;
|
|
|
|
/* Can't resume it if it doesn't have a driver. */
|
|
if (udev->dev.driver == NULL) {
|
|
status = -ENOTCONN;
|
|
goto done;
|
|
}
|
|
|
|
if (udev->quirks & USB_QUIRK_RESET_RESUME)
|
|
udev->reset_resume = 1;
|
|
|
|
udriver = to_usb_device_driver(udev->dev.driver);
|
|
status = udriver->resume(udev);
|
|
|
|
done:
|
|
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
|
|
if (status == 0)
|
|
udev->autoresume_disabled = 0;
|
|
return status;
|
|
}
|
|
|
|
/* Caller has locked intf's usb_device's pm mutex */
|
|
static int usb_suspend_interface(struct usb_device *udev,
|
|
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 (udev->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) {
|
|
status = driver->suspend(intf, msg);
|
|
if (status == 0)
|
|
mark_quiesced(intf);
|
|
else if (!udev->auto_pm)
|
|
dev_err(&intf->dev, "%s error %d\n",
|
|
"suspend", status);
|
|
} else {
|
|
/* Later we will unbind the driver and reprobe */
|
|
intf->needs_binding = 1;
|
|
dev_warn(&intf->dev, "no %s for driver %s?\n",
|
|
"suspend", driver->name);
|
|
mark_quiesced(intf);
|
|
}
|
|
|
|
done:
|
|
dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status);
|
|
return status;
|
|
}
|
|
|
|
/* Caller has locked intf's usb_device's pm_mutex */
|
|
static int usb_resume_interface(struct usb_device *udev,
|
|
struct usb_interface *intf, int reset_resume)
|
|
{
|
|
struct usb_driver *driver;
|
|
int status = 0;
|
|
|
|
if (udev->state == USB_STATE_NOTATTACHED || is_active(intf))
|
|
goto done;
|
|
|
|
/* Don't let autoresume interfere with unbinding */
|
|
if (intf->condition == USB_INTERFACE_UNBINDING)
|
|
goto done;
|
|
|
|
/* Can't resume it if it doesn't have a driver. */
|
|
if (intf->condition == USB_INTERFACE_UNBOUND) {
|
|
|
|
/* Carry out a deferred switch to altsetting 0 */
|
|
if (intf->needs_altsetting0 &&
|
|
intf->dev.power.status == DPM_ON) {
|
|
usb_set_interface(udev, intf->altsetting[0].
|
|
desc.bInterfaceNumber, 0);
|
|
intf->needs_altsetting0 = 0;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
/* Don't resume if the interface is marked for rebinding */
|
|
if (intf->needs_binding)
|
|
goto done;
|
|
driver = to_usb_driver(intf->dev.driver);
|
|
|
|
if (reset_resume) {
|
|
if (driver->reset_resume) {
|
|
status = driver->reset_resume(intf);
|
|
if (status)
|
|
dev_err(&intf->dev, "%s error %d\n",
|
|
"reset_resume", status);
|
|
} else {
|
|
intf->needs_binding = 1;
|
|
dev_warn(&intf->dev, "no %s for driver %s?\n",
|
|
"reset_resume", driver->name);
|
|
}
|
|
} else {
|
|
if (driver->resume) {
|
|
status = driver->resume(intf);
|
|
if (status)
|
|
dev_err(&intf->dev, "%s error %d\n",
|
|
"resume", status);
|
|
} else {
|
|
intf->needs_binding = 1;
|
|
dev_warn(&intf->dev, "no %s for driver %s?\n",
|
|
"resume", driver->name);
|
|
}
|
|
}
|
|
|
|
done:
|
|
dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status);
|
|
if (status == 0 && intf->condition == USB_INTERFACE_BOUND)
|
|
mark_active(intf);
|
|
|
|
/* Later we will unbind the driver and/or reprobe, if necessary */
|
|
return status;
|
|
}
|
|
|
|
#ifdef CONFIG_USB_SUSPEND
|
|
|
|
/* Internal routine to check whether we may autosuspend a device. */
|
|
static int autosuspend_check(struct usb_device *udev, int reschedule)
|
|
{
|
|
int i;
|
|
struct usb_interface *intf;
|
|
unsigned long suspend_time, j;
|
|
|
|
/* For autosuspend, fail fast if anything is in use or autosuspend
|
|
* is disabled. Also fail if any interfaces require remote wakeup
|
|
* but it isn't available.
|
|
*/
|
|
if (udev->pm_usage_cnt > 0)
|
|
return -EBUSY;
|
|
if (udev->autosuspend_delay < 0 || udev->autosuspend_disabled)
|
|
return -EPERM;
|
|
|
|
suspend_time = udev->last_busy + udev->autosuspend_delay;
|
|
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;
|
|
}
|
|
|
|
/* Don't allow autosuspend if the device will need
|
|
* a reset-resume and any of its interface drivers
|
|
* doesn't include support.
|
|
*/
|
|
if (udev->quirks & USB_QUIRK_RESET_RESUME) {
|
|
struct usb_driver *driver;
|
|
|
|
driver = to_usb_driver(intf->dev.driver);
|
|
if (!driver->reset_resume ||
|
|
intf->needs_remote_wakeup)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* If everything is okay but the device hasn't been idle for long
|
|
* enough, queue a delayed autosuspend request. If the device
|
|
* _has_ been idle for long enough and the reschedule flag is set,
|
|
* likewise queue a delayed (1 second) autosuspend request.
|
|
*/
|
|
j = jiffies;
|
|
if (time_before(j, suspend_time))
|
|
reschedule = 1;
|
|
else
|
|
suspend_time = j + HZ;
|
|
if (reschedule) {
|
|
if (!timer_pending(&udev->autosuspend.timer)) {
|
|
queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
|
|
round_jiffies_relative(suspend_time - j));
|
|
}
|
|
return -EAGAIN;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int autosuspend_check(struct usb_device *udev, int reschedule)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_USB_SUSPEND */
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
static 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;
|
|
|
|
if (udev->state == USB_STATE_NOTATTACHED ||
|
|
udev->state == USB_STATE_SUSPENDED)
|
|
goto done;
|
|
|
|
udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
|
|
|
|
if (udev->auto_pm) {
|
|
status = autosuspend_check(udev, 0);
|
|
if (status < 0)
|
|
goto done;
|
|
}
|
|
|
|
/* 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(udev, 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(udev, intf, 0);
|
|
}
|
|
|
|
/* Try another autosuspend when the interfaces aren't busy */
|
|
if (udev->auto_pm)
|
|
autosuspend_check(udev, status == -EBUSY);
|
|
|
|
/* If the suspend succeeded then prevent any more URB submissions,
|
|
* flush any outstanding URBs, and propagate the suspend up the tree.
|
|
*/
|
|
} else {
|
|
cancel_delayed_work(&udev->autosuspend);
|
|
udev->can_submit = 0;
|
|
for (i = 0; i < 16; ++i) {
|
|
usb_hcd_flush_endpoint(udev, udev->ep_out[i]);
|
|
usb_hcd_flush_endpoint(udev, udev->ep_in[i]);
|
|
}
|
|
|
|
/* If this is just a FREEZE or a PRETHAW, udev might
|
|
* not really be suspended. Only true suspends get
|
|
* propagated up the device tree.
|
|
*/
|
|
if (parent && udev->state == USB_STATE_SUSPENDED)
|
|
usb_autosuspend_device(parent);
|
|
}
|
|
|
|
done:
|
|
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, 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.
|
|
*/
|
|
static 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) {
|
|
status = -ENODEV;
|
|
goto done;
|
|
}
|
|
udev->can_submit = 1;
|
|
|
|
/* Propagate the resume up the tree, if necessary */
|
|
if (udev->state == USB_STATE_SUSPENDED) {
|
|
if (udev->auto_pm && udev->autoresume_disabled) {
|
|
status = -EPERM;
|
|
goto done;
|
|
}
|
|
if (parent) {
|
|
status = usb_autoresume_device(parent);
|
|
if (status == 0) {
|
|
status = usb_resume_device(udev);
|
|
if (status || udev->state ==
|
|
USB_STATE_NOTATTACHED) {
|
|
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. */
|
|
status = usb_resume_device(udev);
|
|
}
|
|
} else if (udev->reset_resume)
|
|
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(udev, intf, udev->reset_resume);
|
|
}
|
|
}
|
|
|
|
done:
|
|
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
|
|
if (!status)
|
|
udev->reset_resume = 0;
|
|
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->auto_pm = 1;
|
|
udev->pm_usage_cnt += inc_usage_cnt;
|
|
WARN_ON(udev->pm_usage_cnt < 0);
|
|
if (inc_usage_cnt)
|
|
udev->last_busy = jiffies;
|
|
if (inc_usage_cnt >= 0 && udev->pm_usage_cnt > 0) {
|
|
if (udev->state == USB_STATE_SUSPENDED)
|
|
status = usb_resume_both(udev);
|
|
if (status != 0)
|
|
udev->pm_usage_cnt -= inc_usage_cnt;
|
|
else if (inc_usage_cnt)
|
|
udev->last_busy = jiffies;
|
|
} else if (inc_usage_cnt <= 0 && udev->pm_usage_cnt <= 0) {
|
|
status = usb_suspend_both(udev, PMSG_SUSPEND);
|
|
}
|
|
usb_pm_unlock(udev);
|
|
return status;
|
|
}
|
|
|
|
/* usb_autosuspend_work - callback routine to autosuspend a USB device */
|
|
void usb_autosuspend_work(struct work_struct *work)
|
|
{
|
|
struct usb_device *udev =
|
|
container_of(work, struct usb_device, autosuspend.work);
|
|
|
|
usb_autopm_do_device(udev, 0);
|
|
}
|
|
|
|
/**
|
|
* 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_vdbg(&udev->dev, "%s: cnt %d\n",
|
|
__func__, udev->pm_usage_cnt);
|
|
}
|
|
|
|
/**
|
|
* usb_try_autosuspend_device - attempt an autosuspend of a USB device and its interfaces
|
|
* @udev: the usb_device to autosuspend
|
|
*
|
|
* This routine should be called when a core subsystem thinks @udev may
|
|
* be ready to autosuspend.
|
|
*
|
|
* @udev's usage counter left unchanged. If it or any of the usage counters
|
|
* for an active interface is greater than 0, or autosuspend is not allowed
|
|
* for any other reason, no autosuspend request will be queued.
|
|
*
|
|
* This routine can run only in process context.
|
|
*/
|
|
void usb_try_autosuspend_device(struct usb_device *udev)
|
|
{
|
|
usb_autopm_do_device(udev, 0);
|
|
dev_vdbg(&udev->dev, "%s: cnt %d\n",
|
|
__func__, 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_vdbg(&udev->dev, "%s: status %d cnt %d\n",
|
|
__func__, 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 {
|
|
udev->auto_pm = 1;
|
|
intf->pm_usage_cnt += inc_usage_cnt;
|
|
udev->last_busy = jiffies;
|
|
if (inc_usage_cnt >= 0 && intf->pm_usage_cnt > 0) {
|
|
if (udev->state == USB_STATE_SUSPENDED)
|
|
status = usb_resume_both(udev);
|
|
if (status != 0)
|
|
intf->pm_usage_cnt -= inc_usage_cnt;
|
|
else
|
|
udev->last_busy = jiffies;
|
|
} else if (inc_usage_cnt <= 0 && intf->pm_usage_cnt <= 0) {
|
|
status = usb_suspend_both(udev, PMSG_SUSPEND);
|
|
}
|
|
}
|
|
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_vdbg(&intf->dev, "%s: status %d cnt %d\n",
|
|
__func__, 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. (However if the
|
|
* autoresume fails then the counter is re-decremented.) 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_vdbg(&intf->dev, "%s: status %d cnt %d\n",
|
|
__func__, 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_vdbg(&intf->dev, "%s: status %d cnt %d\n",
|
|
__func__, status, intf->pm_usage_cnt);
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_autopm_set_interface);
|
|
|
|
#else
|
|
|
|
void usb_autosuspend_work(struct work_struct *work)
|
|
{}
|
|
|
|
#endif /* CONFIG_USB_SUSPEND */
|
|
|
|
/**
|
|
* usb_external_suspend_device - external suspend of a USB device and its interfaces
|
|
* @udev: the usb_device to suspend
|
|
* @msg: Power Management message describing this state transition
|
|
*
|
|
* This routine handles external suspend requests: ones not generated
|
|
* internally by a USB driver (autosuspend) but rather coming from the user
|
|
* (via sysfs) or the PM core (system sleep). The suspend will be carried
|
|
* out regardless of @udev's usage counter or those of its interfaces,
|
|
* and regardless of whether or not remote wakeup is enabled. Of course,
|
|
* interface drivers still have the option of failing the suspend (if
|
|
* there are unsuspended children, for example).
|
|
*
|
|
* The caller must hold @udev's device lock.
|
|
*/
|
|
int usb_external_suspend_device(struct usb_device *udev, pm_message_t msg)
|
|
{
|
|
int status;
|
|
|
|
do_unbind_rebind(udev, DO_UNBIND);
|
|
usb_pm_lock(udev);
|
|
udev->auto_pm = 0;
|
|
status = usb_suspend_both(udev, msg);
|
|
usb_pm_unlock(udev);
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* usb_external_resume_device - external resume of a USB device and its interfaces
|
|
* @udev: the usb_device to resume
|
|
*
|
|
* This routine handles external resume requests: ones not generated
|
|
* internally by a USB driver (autoresume) but rather coming from the user
|
|
* (via sysfs), the PM core (system resume), or the device itself (remote
|
|
* wakeup). @udev's usage counter is unaffected.
|
|
*
|
|
* The caller must hold @udev's device lock.
|
|
*/
|
|
int usb_external_resume_device(struct usb_device *udev)
|
|
{
|
|
int status;
|
|
|
|
usb_pm_lock(udev);
|
|
udev->auto_pm = 0;
|
|
status = usb_resume_both(udev);
|
|
udev->last_busy = jiffies;
|
|
usb_pm_unlock(udev);
|
|
if (status == 0)
|
|
do_unbind_rebind(udev, DO_REBIND);
|
|
|
|
/* Now that the device is awake, we can start trying to autosuspend
|
|
* it again. */
|
|
if (status == 0)
|
|
usb_try_autosuspend_device(udev);
|
|
return status;
|
|
}
|
|
|
|
int usb_suspend(struct device *dev, pm_message_t message)
|
|
{
|
|
struct usb_device *udev;
|
|
|
|
udev = to_usb_device(dev);
|
|
|
|
/* If udev is already suspended, we can skip this suspend and
|
|
* we should also skip the upcoming system resume. High-speed
|
|
* root hubs are an exception; they need to resume whenever the
|
|
* system wakes up in order for USB-PERSIST port handover to work
|
|
* properly.
|
|
*/
|
|
if (udev->state == USB_STATE_SUSPENDED) {
|
|
if (udev->parent || udev->speed != USB_SPEED_HIGH)
|
|
udev->skip_sys_resume = 1;
|
|
return 0;
|
|
}
|
|
|
|
udev->skip_sys_resume = 0;
|
|
return usb_external_suspend_device(udev, message);
|
|
}
|
|
|
|
int usb_resume(struct device *dev)
|
|
{
|
|
struct usb_device *udev;
|
|
|
|
udev = to_usb_device(dev);
|
|
|
|
/* If udev->skip_sys_resume is set then udev was already suspended
|
|
* when the system sleep started, so we don't want to resume it
|
|
* during this system wakeup.
|
|
*/
|
|
if (udev->skip_sys_resume)
|
|
return 0;
|
|
return usb_external_resume_device(udev);
|
|
}
|
|
|
|
#endif /* CONFIG_PM */
|
|
|
|
struct bus_type usb_bus_type = {
|
|
.name = "usb",
|
|
.match = usb_device_match,
|
|
.uevent = usb_uevent,
|
|
};
|