| /* |
| * drivers/usb/driver.c - most of the driver model stuff for usb |
| * |
| * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de> |
| * |
| * based on drivers/usb/usb.c which had the following copyrights: |
| * (C) Copyright Linus Torvalds 1999 |
| * (C) Copyright Johannes Erdfelt 1999-2001 |
| * (C) Copyright Andreas Gal 1999 |
| * (C) Copyright Gregory P. Smith 1999 |
| * (C) Copyright Deti Fliegl 1999 (new USB architecture) |
| * (C) Copyright Randy Dunlap 2000 |
| * (C) Copyright David Brownell 2000-2004 |
| * (C) Copyright Yggdrasil Computing, Inc. 2000 |
| * (usb_device_id matching changes by Adam J. Richter) |
| * (C) Copyright Greg Kroah-Hartman 2002-2003 |
| * |
| * NOTE! This is not actually a driver at all, rather this is |
| * just a collection of helper routines that implement the |
| * matching, probing, releasing, suspending and resuming for |
| * real drivers. |
| * |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/slab.h> |
| #include <linux/usb.h> |
| #include <linux/usb/quirks.h> |
| #include <linux/usb/hcd.h> |
| |
| #include "usb.h" |
| |
| |
| #ifdef CONFIG_HOTPLUG |
| |
| /* |
| * Adds a new dynamic USBdevice ID to this driver, |
| * and cause the driver to probe for all devices again. |
| */ |
| ssize_t usb_store_new_id(struct usb_dynids *dynids, |
| struct device_driver *driver, |
| const char *buf, size_t count) |
| { |
| 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) |
| return -EINVAL; |
| |
| dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); |
| if (!dynid) |
| return -ENOMEM; |
| |
| INIT_LIST_HEAD(&dynid->node); |
| dynid->id.idVendor = idVendor; |
| dynid->id.idProduct = idProduct; |
| dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE; |
| |
| spin_lock(&dynids->lock); |
| list_add_tail(&dynid->node, &dynids->list); |
| spin_unlock(&dynids->lock); |
| |
| if (get_driver(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); |
| |
| /** |
| * store_remove_id - remove a USB device ID from this driver |
| * @driver: target device driver |
| * @buf: buffer for scanning device ID data |
| * @count: input size |
| * |
| * Removes a dynamic usb device ID from this driver. |
| */ |
| static ssize_t |
| store_remove_id(struct device_driver *driver, const char *buf, size_t count) |
| { |
| struct usb_dynid *dynid, *n; |
| struct usb_driver *usb_driver = to_usb_driver(driver); |
| u32 idVendor = 0; |
| u32 idProduct = 0; |
| int fields = 0; |
| int retval = 0; |
| |
| fields = sscanf(buf, "%x %x", &idVendor, &idProduct); |
| if (fields < 2) |
| return -EINVAL; |
| |
| spin_lock(&usb_driver->dynids.lock); |
| list_for_each_entry_safe(dynid, n, &usb_driver->dynids.list, node) { |
| struct usb_device_id *id = &dynid->id; |
| if ((id->idVendor == idVendor) && |
| (id->idProduct == idProduct)) { |
| list_del(&dynid->node); |
| kfree(dynid); |
| retval = 0; |
| break; |
| } |
| } |
| spin_unlock(&usb_driver->dynids.lock); |
| |
| if (retval) |
| return retval; |
| return count; |
| } |
| static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id); |
| |
| static int usb_create_newid_file(struct usb_driver *usb_drv) |
| { |
| int error = 0; |
| |
| if (usb_drv->no_dynamic_id) |
| goto exit; |
| |
| if (usb_drv->probe != NULL) |
| error = driver_create_file(&usb_drv->drvwrap.driver, |
| &driver_attr_new_id); |
| exit: |
| return error; |
| } |
| |
| static void usb_remove_newid_file(struct usb_driver *usb_drv) |
| { |
| if (usb_drv->no_dynamic_id) |
| return; |
| |
| if (usb_drv->probe != NULL) |
| driver_remove_file(&usb_drv->drvwrap.driver, |
| &driver_attr_new_id); |
| } |
| |
| static int |
| usb_create_removeid_file(struct usb_driver *drv) |
| { |
| int error = 0; |
| if (drv->probe != NULL) |
| error = driver_create_file(&drv->drvwrap.driver, |
| &driver_attr_remove_id); |
| return error; |
| } |
| |
| static void usb_remove_removeid_file(struct usb_driver *drv) |
| { |
| driver_remove_file(&drv->drvwrap.driver, &driver_attr_remove_id); |
| } |
| |
| static void usb_free_dynids(struct usb_driver *usb_drv) |
| { |
| struct usb_dynid *dynid, *n; |
| |
| spin_lock(&usb_drv->dynids.lock); |
| list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) { |
| list_del(&dynid->node); |
| kfree(dynid); |
| } |
| spin_unlock(&usb_drv->dynids.lock); |
| } |
| #else |
| static inline int usb_create_newid_file(struct usb_driver *usb_drv) |
| { |
| return 0; |
| } |
| |
| static void usb_remove_newid_file(struct usb_driver *usb_drv) |
| { |
| } |
| |
| static int |
| usb_create_removeid_file(struct usb_driver *drv) |
| { |
| return 0; |
| } |
| |
| static void usb_remove_removeid_file(struct usb_driver *drv) |
| { |
| } |
| |
| static inline void usb_free_dynids(struct usb_driver *usb_drv) |
| { |
| } |
| #endif |
| |
| static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf, |
| struct usb_driver *drv) |
| { |
| struct usb_dynid *dynid; |
| |
| spin_lock(&drv->dynids.lock); |
| list_for_each_entry(dynid, &drv->dynids.list, node) { |
| if (usb_match_one_id(intf, &dynid->id)) { |
| spin_unlock(&drv->dynids.lock); |
| return &dynid->id; |
| } |
| } |
| spin_unlock(&drv->dynids.lock); |
| return NULL; |
| } |
| |
| |
| /* called from driver core with dev locked */ |
| static int usb_probe_device(struct device *dev) |
| { |
| struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); |
| struct usb_device *udev = to_usb_device(dev); |
| int error = 0; |
| |
| dev_dbg(dev, "%s\n", __func__); |
| |
| /* TODO: Add real matching code */ |
| |
| /* The device should always appear to be in use |
| * unless the driver suports autosuspend. |
| */ |
| if (!udriver->supports_autosuspend) |
| error = usb_autoresume_device(udev); |
| |
| if (!error) |
| error = udriver->probe(udev); |
| return error; |
| } |
| |
| /* called from driver core with dev locked */ |
| static int usb_unbind_device(struct device *dev) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); |
| |
| udriver->disconnect(udev); |
| if (!udriver->supports_autosuspend) |
| usb_autosuspend_device(udev); |
| return 0; |
| } |
| |
| /* |
| * Cancel any pending scheduled resets |
| * |
| * [see usb_queue_reset_device()] |
| * |
| * Called after unconfiguring / when releasing interfaces. See |
| * comments in __usb_queue_reset_device() regarding |
| * udev->reset_running. |
| */ |
| static void usb_cancel_queued_reset(struct usb_interface *iface) |
| { |
| if (iface->reset_running == 0) |
| cancel_work_sync(&iface->reset_ws); |
| } |
| |
| /* called from driver core with dev locked */ |
| static int usb_probe_interface(struct device *dev) |
| { |
| struct usb_driver *driver = to_usb_driver(dev->driver); |
| struct usb_interface *intf = to_usb_interface(dev); |
| struct usb_device *udev = interface_to_usbdev(intf); |
| const struct usb_device_id *id; |
| int error = -ENODEV; |
| |
| dev_dbg(dev, "%s\n", __func__); |
| |
| intf->needs_binding = 0; |
| |
| if (usb_device_is_owned(udev)) |
| return error; |
| |
| if (udev->authorized == 0) { |
| dev_err(&intf->dev, "Device is not authorized for usage\n"); |
| return error; |
| } |
| |
| id = usb_match_id(intf, driver->id_table); |
| if (!id) |
| id = usb_match_dynamic_id(intf, driver); |
| if (!id) |
| return error; |
| |
| dev_dbg(dev, "%s - got id\n", __func__); |
| |
| error = usb_autoresume_device(udev); |
| if (error) |
| return error; |
| |
| intf->condition = USB_INTERFACE_BINDING; |
| |
| /* Probed interfaces are initially active. They are |
| * runtime-PM-enabled only if the driver has autosuspend support. |
| * They are sensitive to their children's power states. |
| */ |
| pm_runtime_set_active(dev); |
| pm_suspend_ignore_children(dev, false); |
| if (driver->supports_autosuspend) |
| pm_runtime_enable(dev); |
| |
| /* Carry out a deferred switch to altsetting 0 */ |
| if (intf->needs_altsetting0) { |
| error = usb_set_interface(udev, intf->altsetting[0]. |
| desc.bInterfaceNumber, 0); |
| if (error < 0) |
| goto err; |
| intf->needs_altsetting0 = 0; |
| } |
| |
| error = driver->probe(intf, id); |
| if (error) |
| goto err; |
| |
| intf->condition = USB_INTERFACE_BOUND; |
| usb_autosuspend_device(udev); |
| return error; |
| |
| err: |
| intf->needs_remote_wakeup = 0; |
| intf->condition = USB_INTERFACE_UNBOUND; |
| usb_cancel_queued_reset(intf); |
| |
| /* Unbound interfaces are always runtime-PM-disabled and -suspended */ |
| if (driver->supports_autosuspend) |
| pm_runtime_disable(dev); |
| pm_runtime_set_suspended(dev); |
| |
| usb_autosuspend_device(udev); |
| return error; |
| } |
| |
| /* called from driver core with dev locked */ |
| static int usb_unbind_interface(struct device *dev) |
| { |
| struct usb_driver *driver = to_usb_driver(dev->driver); |
| struct usb_interface *intf = to_usb_interface(dev); |
| struct usb_device *udev; |
| int error, r; |
| |
| intf->condition = USB_INTERFACE_UNBINDING; |
| |
| /* Autoresume for set_interface call below */ |
| udev = interface_to_usbdev(intf); |
| error = usb_autoresume_device(udev); |
| |
| /* Terminate all URBs for this interface unless the driver |
| * supports "soft" unbinding. |
| */ |
| if (!driver->soft_unbind) |
| usb_disable_interface(udev, intf, false); |
| |
| driver->disconnect(intf); |
| usb_cancel_queued_reset(intf); |
| |
| /* Reset other interface state. |
| * We cannot do a Set-Interface if the device is suspended or |
| * if it is prepared for a system sleep (since installing a new |
| * altsetting means creating new endpoint device entries). |
| * When either of these happens, defer the Set-Interface. |
| */ |
| if (intf->cur_altsetting->desc.bAlternateSetting == 0) { |
| /* Already in altsetting 0 so skip Set-Interface. |
| * Just re-enable it without affecting the endpoint toggles. |
| */ |
| usb_enable_interface(udev, intf, false); |
| } else if (!error && !intf->dev.power.is_prepared) { |
| r = usb_set_interface(udev, intf->altsetting[0]. |
| desc.bInterfaceNumber, 0); |
| if (r < 0) |
| intf->needs_altsetting0 = 1; |
| } else { |
| intf->needs_altsetting0 = 1; |
| } |
| usb_set_intfdata(intf, NULL); |
| |
| intf->condition = USB_INTERFACE_UNBOUND; |
| intf->needs_remote_wakeup = 0; |
| |
| /* Unbound interfaces are always runtime-PM-disabled and -suspended */ |
| if (driver->supports_autosuspend) |
| pm_runtime_disable(dev); |
| pm_runtime_set_suspended(dev); |
| |
| /* Undo any residual pm_autopm_get_interface_* calls */ |
| for (r = atomic_read(&intf->pm_usage_cnt); r > 0; --r) |
| usb_autopm_put_interface_no_suspend(intf); |
| atomic_set(&intf->pm_usage_cnt, 0); |
| |
| if (!error) |
| usb_autosuspend_device(udev); |
| |
| return 0; |
| } |
| |
| /** |
| * usb_driver_claim_interface - bind a driver to an interface |
| * @driver: the driver to be bound |
| * @iface: the interface to which it will be bound; must be in the |
| * usb device's active configuration |
| * @priv: driver data associated with that interface |
| * |
| * This is used by usb device drivers that need to claim more than one |
| * interface on a device when probing (audio and acm are current examples). |
| * No device driver should directly modify internal usb_interface or |
| * usb_device structure members. |
| * |
| * Few drivers should need to use this routine, since the most natural |
| * way to bind to an interface is to return the private data from |
| * the driver's probe() method. |
| * |
| * Callers must own the device lock, so driver probe() entries don't need |
| * extra locking, but other call contexts may need to explicitly claim that |
| * lock. |
| */ |
| int usb_driver_claim_interface(struct usb_driver *driver, |
| struct usb_interface *iface, void *priv) |
| { |
| struct device *dev = &iface->dev; |
| int retval = 0; |
| |
| if (dev->driver) |
| return -EBUSY; |
| |
| dev->driver = &driver->drvwrap.driver; |
| usb_set_intfdata(iface, priv); |
| iface->needs_binding = 0; |
| |
| iface->condition = USB_INTERFACE_BOUND; |
| |
| /* Claimed interfaces are initially inactive (suspended) and |
| * runtime-PM-enabled, but only if the driver has autosuspend |
| * support. Otherwise they are marked active, to prevent the |
| * device from being autosuspended, but left disabled. In either |
| * case they are sensitive to their children's power states. |
| */ |
| pm_suspend_ignore_children(dev, false); |
| if (driver->supports_autosuspend) |
| pm_runtime_enable(dev); |
| else |
| pm_runtime_set_active(dev); |
| |
| /* if interface was already added, bind now; else let |
| * the future device_add() bind it, bypassing probe() |
| */ |
| if (device_is_registered(dev)) |
| retval = device_bind_driver(dev); |
| |
| return retval; |
| } |
| EXPORT_SYMBOL_GPL(usb_driver_claim_interface); |
| |
| /** |
| * usb_driver_release_interface - unbind a driver from an interface |
| * @driver: the driver to be unbound |
| * @iface: the interface from which it will be unbound |
| * |
| * This can be used by drivers to release an interface without waiting |
| * for their disconnect() methods to be called. In typical cases this |
| * also causes the driver disconnect() method to be called. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| * Callers must own the device lock, so driver disconnect() entries don't |
| * need extra locking, but other call contexts may need to explicitly claim |
| * that lock. |
| */ |
| void usb_driver_release_interface(struct usb_driver *driver, |
| struct usb_interface *iface) |
| { |
| struct device *dev = &iface->dev; |
| |
| /* this should never happen, don't release something that's not ours */ |
| if (!dev->driver || dev->driver != &driver->drvwrap.driver) |
| return; |
| |
| /* don't release from within disconnect() */ |
| if (iface->condition != USB_INTERFACE_BOUND) |
| return; |
| iface->condition = USB_INTERFACE_UNBINDING; |
| |
| /* Release via the driver core only if the interface |
| * has already been registered |
| */ |
| if (device_is_registered(dev)) { |
| device_release_driver(dev); |
| } else { |
| device_lock(dev); |
| usb_unbind_interface(dev); |
| dev->driver = NULL; |
| device_unlock(dev); |
| } |
| } |
| EXPORT_SYMBOL_GPL(usb_driver_release_interface); |
| |
| /* returns 0 if no match, 1 if match */ |
| int usb_match_device(struct usb_device *dev, const struct usb_device_id *id) |
| { |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && |
| id->idVendor != le16_to_cpu(dev->descriptor.idVendor)) |
| return 0; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && |
| id->idProduct != le16_to_cpu(dev->descriptor.idProduct)) |
| return 0; |
| |
| /* No need to test id->bcdDevice_lo != 0, since 0 is never |
| greater than any unsigned number. */ |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) && |
| (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice))) |
| return 0; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && |
| (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice))) |
| return 0; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) && |
| (id->bDeviceClass != dev->descriptor.bDeviceClass)) |
| return 0; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) && |
| (id->bDeviceSubClass != dev->descriptor.bDeviceSubClass)) |
| return 0; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) && |
| (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; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && |
| (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass)) |
| return 0; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && |
| (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol)) |
| 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 |
| * @id: array of usb_device_id structures, terminated by zero entry |
| * |
| * usb_match_id searches an array of usb_device_id's and returns |
| * the first one matching the device or interface, or null. |
| * This is used when binding (or rebinding) a driver to an interface. |
| * Most USB device drivers will use this indirectly, through the usb core, |
| * but some layered driver frameworks use it directly. |
| * These device tables are exported with MODULE_DEVICE_TABLE, through |
| * modutils, to support the driver loading functionality of USB hotplugging. |
| * |
| * What Matches: |
| * |
| * The "match_flags" element in a usb_device_id controls which |
| * members are used. If the corresponding bit is set, the |
| * value in the device_id must match its corresponding member |
| * in the device or interface descriptor, or else the device_id |
| * does not match. |
| * |
| * "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 |
| * 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 if (is_usb_interface(dev)) { |
| 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; |
| |
| if (is_usb_device(dev)) { |
| usb_dev = to_usb_device(dev); |
| } else if (is_usb_interface(dev)) { |
| struct usb_interface *intf = to_usb_interface(dev); |
| |
| usb_dev = interface_to_usbdev(intf); |
| } else { |
| return 0; |
| } |
| |
| if (usb_dev->devnum < 0) { |
| /* driver is often null here; dev_dbg() would oops */ |
| 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) |
| goto out; |
| |
| usbfs_update_special(); |
| |
| retval = usb_create_newid_file(new_driver); |
| if (retval) |
| goto out_newid; |
| |
| retval = usb_create_removeid_file(new_driver); |
| if (retval) |
| goto out_removeid; |
| |
| pr_info("%s: registered new interface driver %s\n", |
| usbcore_name, new_driver->name); |
| |
| out: |
| return retval; |
| |
| out_removeid: |
| usb_remove_newid_file(new_driver); |
| out_newid: |
| driver_unregister(&new_driver->drvwrap.driver); |
| |
| printk(KERN_ERR "%s: error %d registering interface " |
| " driver %s\n", |
| usbcore_name, retval, new_driver->name); |
| goto out; |
| } |
| 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_removeid_file(driver); |
| 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.is_prepared) { |
| 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; |
| } |
| } |
| } |
| } |
| |
| 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; |
| } |
| |
| static int usb_resume_device(struct usb_device *udev, pm_message_t msg) |
| { |
| 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; |
| } |
| |
| /* Non-root devices on a full/low-speed bus must wait for their |
| * companion high-speed root hub, in case a handoff is needed. |
| */ |
| if (!PMSG_IS_AUTO(msg) && udev->parent && udev->bus->hs_companion) |
| device_pm_wait_for_dev(&udev->dev, |
| &udev->bus->hs_companion->root_hub->dev); |
| |
| if (udev->quirks & USB_QUIRK_RESET_RESUME) |
| udev->reset_resume = 1; |
| |
| udriver = to_usb_device_driver(udev->dev.driver); |
| status = udriver->resume(udev, msg); |
| |
| done: |
| dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
| return status; |
| } |
| |
| static int usb_suspend_interface(struct usb_device *udev, |
| struct usb_interface *intf, pm_message_t msg) |
| { |
| struct usb_driver *driver; |
| int status = 0; |
| |
| if (udev->state == USB_STATE_NOTATTACHED || |
| intf->condition == USB_INTERFACE_UNBOUND) |
| goto done; |
| driver = to_usb_driver(intf->dev.driver); |
| |
| if (driver->suspend) { |
| status = driver->suspend(intf, msg); |
| if (status && !PMSG_IS_AUTO(msg)) |
| 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); |
| } |
| |
| done: |
| dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status); |
| return status; |
| } |
| |
| static int usb_resume_interface(struct usb_device *udev, |
| struct usb_interface *intf, pm_message_t msg, int reset_resume) |
| { |
| struct usb_driver *driver; |
| int status = 0; |
| |
| if (udev->state == USB_STATE_NOTATTACHED) |
| 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.is_prepared) { |
| 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); |
| |
| /* Later we will unbind the driver and/or reprobe, if necessary */ |
| return status; |
| } |
| |
| /** |
| * 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. |
| * |
| * Autosuspend requests originating from a child device or an interface |
| * driver may be made without the protection of @udev's device lock, but |
| * all other suspend calls will hold the lock. Usbcore will insure that |
| * method calls do not arrive during bind, unbind, or reset operations. |
| * However drivers must be prepared to handle suspend calls arriving at |
| * unpredictable times. |
| * |
| * 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, n = 0; |
| struct usb_interface *intf; |
| |
| if (udev->state == USB_STATE_NOTATTACHED || |
| udev->state == USB_STATE_SUSPENDED) |
| goto done; |
| |
| /* Suspend all the interfaces and then udev itself */ |
| if (udev->actconfig) { |
| n = udev->actconfig->desc.bNumInterfaces; |
| for (i = n - 1; i >= 0; --i) { |
| intf = udev->actconfig->interface[i]; |
| status = usb_suspend_interface(udev, intf, msg); |
| |
| /* Ignore errors during system sleep transitions */ |
| if (!PMSG_IS_AUTO(msg)) |
| status = 0; |
| if (status != 0) |
| break; |
| } |
| } |
| if (status == 0) { |
| status = usb_suspend_device(udev, msg); |
| |
| /* Again, ignore errors during system sleep transitions */ |
| if (!PMSG_IS_AUTO(msg)) |
| status = 0; |
| } |
| |
| /* If the suspend failed, resume interfaces that did get suspended */ |
| if (status != 0) { |
| msg.event ^= (PM_EVENT_SUSPEND | PM_EVENT_RESUME); |
| while (++i < n) { |
| intf = udev->actconfig->interface[i]; |
| usb_resume_interface(udev, intf, msg, 0); |
| } |
| |
| /* If the suspend succeeded then prevent any more URB submissions |
| * and flush any outstanding URBs. |
| */ |
| } else { |
| 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]); |
| } |
| } |
| |
| 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 |
| * @msg: Power Management message describing this state transition |
| * |
| * 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. |
| * |
| * Autoresume requests originating from a child device or an interface |
| * driver may be made without the protection of @udev's device lock, but |
| * all other resume calls will hold the lock. Usbcore will insure that |
| * method calls do not arrive during bind, unbind, or reset operations. |
| * However drivers must be prepared to handle resume calls arriving at |
| * unpredictable times. |
| * |
| * This routine can run only in process context. |
| */ |
| static int usb_resume_both(struct usb_device *udev, pm_message_t msg) |
| { |
| int status = 0; |
| int i; |
| struct usb_interface *intf; |
| |
| if (udev->state == USB_STATE_NOTATTACHED) { |
| status = -ENODEV; |
| goto done; |
| } |
| udev->can_submit = 1; |
| |
| /* Resume the device */ |
| if (udev->state == USB_STATE_SUSPENDED || udev->reset_resume) |
| status = usb_resume_device(udev, msg); |
| |
| /* Resume the interfaces */ |
| if (status == 0 && udev->actconfig) { |
| for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
| intf = udev->actconfig->interface[i]; |
| usb_resume_interface(udev, intf, msg, |
| udev->reset_resume); |
| } |
| } |
| usb_mark_last_busy(udev); |
| |
| done: |
| dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
| if (!status) |
| udev->reset_resume = 0; |
| return status; |
| } |
| |
| static void choose_wakeup(struct usb_device *udev, pm_message_t msg) |
| { |
| int w; |
| |
| /* Remote wakeup is needed only when we actually go to sleep. |
| * For things like FREEZE and QUIESCE, if the device is already |
| * autosuspended then its current wakeup setting is okay. |
| */ |
| if (msg.event == PM_EVENT_FREEZE || msg.event == PM_EVENT_QUIESCE) { |
| if (udev->state != USB_STATE_SUSPENDED) |
| udev->do_remote_wakeup = 0; |
| return; |
| } |
| |
| /* Enable remote wakeup if it is allowed, even if no interface drivers |
| * actually want it. |
| */ |
| w = device_may_wakeup(&udev->dev); |
| |
| /* If the device is autosuspended with the wrong wakeup setting, |
| * autoresume now so the setting can be changed. |
| */ |
| if (udev->state == USB_STATE_SUSPENDED && w != udev->do_remote_wakeup) |
| pm_runtime_resume(&udev->dev); |
| udev->do_remote_wakeup = w; |
| } |
| |
| /* The device lock is held by the PM core */ |
| int usb_suspend(struct device *dev, pm_message_t msg) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| |
| do_unbind_rebind(udev, DO_UNBIND); |
| choose_wakeup(udev, msg); |
| return usb_suspend_both(udev, msg); |
| } |
| |
| /* The device lock is held by the PM core */ |
| int usb_resume(struct device *dev, pm_message_t msg) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| int status; |
| |
| /* For PM complete calls, all we do is rebind interfaces */ |
| if (msg.event == PM_EVENT_ON) { |
| if (udev->state != USB_STATE_NOTATTACHED) |
| do_unbind_rebind(udev, DO_REBIND); |
| status = 0; |
| |
| /* For all other calls, take the device back to full power and |
| * tell the PM core in case it was autosuspended previously. |
| * Unbind the interfaces that will need rebinding later. |
| */ |
| } else { |
| status = usb_resume_both(udev, msg); |
| if (status == 0) { |
| pm_runtime_disable(dev); |
| pm_runtime_set_active(dev); |
| pm_runtime_enable(dev); |
| do_unbind_rebind(udev, DO_REBIND); |
| } |
| } |
| |
| /* Avoid PM error messages for devices disconnected while suspended |
| * as we'll display regular disconnect messages just a bit later. |
| */ |
| if (status == -ENODEV || status == -ESHUTDOWN) |
| status = 0; |
| return status; |
| } |
| |
| #endif /* CONFIG_PM */ |
| |
| #ifdef CONFIG_USB_SUSPEND |
| |
| /** |
| * usb_enable_autosuspend - allow a USB device to be autosuspended |
| * @udev: the USB device which may be autosuspended |
| * |
| * This routine allows @udev to be autosuspended. An autosuspend won't |
| * take place until the autosuspend_delay has elapsed and all the other |
| * necessary conditions are satisfied. |
| * |
| * The caller must hold @udev's device lock. |
| */ |
| void usb_enable_autosuspend(struct usb_device *udev) |
| { |
| pm_runtime_allow(&udev->dev); |
| } |
| EXPORT_SYMBOL_GPL(usb_enable_autosuspend); |
| |
| /** |
| * usb_disable_autosuspend - prevent a USB device from being autosuspended |
| * @udev: the USB device which may not be autosuspended |
| * |
| * This routine prevents @udev from being autosuspended and wakes it up |
| * if it is already autosuspended. |
| * |
| * The caller must hold @udev's device lock. |
| */ |
| void usb_disable_autosuspend(struct usb_device *udev) |
| { |
| pm_runtime_forbid(&udev->dev); |
| } |
| EXPORT_SYMBOL_GPL(usb_disable_autosuspend); |
| |
| /** |
| * 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 drops to 0 and all the |
| * interfaces are inactive then a delayed autosuspend will be attempted. |
| * The attempt may fail (see autosuspend_check()). |
| * |
| * The caller must hold @udev's device lock. |
| * |
| * This routine can run only in process context. |
| */ |
| void usb_autosuspend_device(struct usb_device *udev) |
| { |
| int status; |
| |
| usb_mark_last_busy(udev); |
| status = pm_runtime_put_sync_autosuspend(&udev->dev); |
| dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n", |
| __func__, atomic_read(&udev->dev.power.usage_count), |
| status); |
| } |
| |
| /** |
| * 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. |
| * |
| * The caller must hold @udev's device lock. |
| * |
| * This routine can run only in process context. |
| */ |
| int usb_autoresume_device(struct usb_device *udev) |
| { |
| int status; |
| |
| status = pm_runtime_get_sync(&udev->dev); |
| if (status < 0) |
| pm_runtime_put_sync(&udev->dev); |
| dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n", |
| __func__, atomic_read(&udev->dev.power.usage_count), |
| status); |
| if (status > 0) |
| status = 0; |
| 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 attempted. The |
| * attempt may fail (see autosuspend_check()). |
| * |
| * This routine can run only in process context. |
| */ |
| void usb_autopm_put_interface(struct usb_interface *intf) |
| { |
| struct usb_device *udev = interface_to_usbdev(intf); |
| int status; |
| |
| usb_mark_last_busy(udev); |
| atomic_dec(&intf->pm_usage_cnt); |
| status = pm_runtime_put_sync(&intf->dev); |
| dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
| __func__, atomic_read(&intf->dev.power.usage_count), |
| status); |
| } |
| EXPORT_SYMBOL_GPL(usb_autopm_put_interface); |
| |
| /** |
| * usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter |
| * @intf: the usb_interface whose counter should be decremented |
| * |
| * This routine does much the same thing as usb_autopm_put_interface(): |
| * It decrements @intf's usage counter and schedules a delayed |
| * autosuspend request if the counter is <= 0. The difference is that it |
| * does not perform any synchronization; callers should hold a private |
| * lock and handle all synchronization issues themselves. |
| * |
| * Typically a driver would call this routine during an URB's completion |
| * handler, if no more URBs were pending. |
| * |
| * This routine can run in atomic context. |
| */ |
| void usb_autopm_put_interface_async(struct usb_interface *intf) |
| { |
| struct usb_device *udev = interface_to_usbdev(intf); |
| int status; |
| |
| usb_mark_last_busy(udev); |
| atomic_dec(&intf->pm_usage_cnt); |
| status = pm_runtime_put(&intf->dev); |
| dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
| __func__, atomic_read(&intf->dev.power.usage_count), |
| status); |
| } |
| EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async); |
| |
| /** |
| * usb_autopm_put_interface_no_suspend - decrement a USB interface's PM-usage counter |
| * @intf: the usb_interface whose counter should be decremented |
| * |
| * This routine decrements @intf's usage counter but does not carry out an |
| * autosuspend. |
| * |
| * This routine can run in atomic context. |
| */ |
| void usb_autopm_put_interface_no_suspend(struct usb_interface *intf) |
| { |
| struct usb_device *udev = interface_to_usbdev(intf); |
| |
| usb_mark_last_busy(udev); |
| atomic_dec(&intf->pm_usage_cnt); |
| pm_runtime_put_noidle(&intf->dev); |
| } |
| EXPORT_SYMBOL_GPL(usb_autopm_put_interface_no_suspend); |
| |
| /** |
| * 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. |
| * |
| * @intf's usage counter is incremented to prevent subsequent autosuspends. |
| * However if the autoresume fails then the counter is re-decremented. |
| * |
| * This routine can run only in process context. |
| */ |
| int usb_autopm_get_interface(struct usb_interface *intf) |
| { |
| int status; |
| |
| status = pm_runtime_get_sync(&intf->dev); |
| if (status < 0) |
| pm_runtime_put_sync(&intf->dev); |
| else |
| atomic_inc(&intf->pm_usage_cnt); |
| dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
| __func__, atomic_read(&intf->dev.power.usage_count), |
| status); |
| if (status > 0) |
| status = 0; |
| return status; |
| } |
| EXPORT_SYMBOL_GPL(usb_autopm_get_interface); |
| |
| /** |
| * usb_autopm_get_interface_async - increment a USB interface's PM-usage counter |
| * @intf: the usb_interface whose counter should be incremented |
| * |
| * This routine does much the same thing as |
| * usb_autopm_get_interface(): It increments @intf's usage counter and |
| * queues an autoresume request if the device is suspended. The |
| * differences are that it does not perform any synchronization (callers |
| * should hold a private lock and handle all synchronization issues |
| * themselves), and it does not autoresume the device directly (it only |
| * queues a request). After a successful call, the device may not yet be |
| * resumed. |
| * |
| * This routine can run in atomic context. |
| */ |
| int usb_autopm_get_interface_async(struct usb_interface *intf) |
| { |
| int status; |
| |
| status = pm_runtime_get(&intf->dev); |
| if (status < 0 && status != -EINPROGRESS) |
| pm_runtime_put_noidle(&intf->dev); |
| else |
| atomic_inc(&intf->pm_usage_cnt); |
| dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
| __func__, atomic_read(&intf->dev.power.usage_count), |
| status); |
| if (status > 0) |
| status = 0; |
| return status; |
| } |
| EXPORT_SYMBOL_GPL(usb_autopm_get_interface_async); |
| |
| /** |
| * usb_autopm_get_interface_no_resume - increment a USB interface's PM-usage counter |
| * @intf: the usb_interface whose counter should be incremented |
| * |
| * This routine increments @intf's usage counter but does not carry out an |
| * autoresume. |
| * |
| * This routine can run in atomic context. |
| */ |
| void usb_autopm_get_interface_no_resume(struct usb_interface *intf) |
| { |
| struct usb_device *udev = interface_to_usbdev(intf); |
| |
| usb_mark_last_busy(udev); |
| atomic_inc(&intf->pm_usage_cnt); |
| pm_runtime_get_noresume(&intf->dev); |
| } |
| EXPORT_SYMBOL_GPL(usb_autopm_get_interface_no_resume); |
| |
| /* Internal routine to check whether we may autosuspend a device. */ |
| static int autosuspend_check(struct usb_device *udev) |
| { |
| int w, i; |
| struct usb_interface *intf; |
| |
| /* Fail if autosuspend is disabled, or any interfaces are in use, or |
| * any interface drivers require remote wakeup but it isn't available. |
| */ |
| w = 0; |
| if (udev->actconfig) { |
| for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
| intf = udev->actconfig->interface[i]; |
| |
| /* We don't need to check interfaces that are |
| * disabled for runtime PM. Either they are unbound |
| * or else their drivers don't support autosuspend |
| * and so they are permanently active. |
| */ |
| if (intf->dev.power.disable_depth) |
| continue; |
| if (atomic_read(&intf->dev.power.usage_count) > 0) |
| return -EBUSY; |
| w |= intf->needs_remote_wakeup; |
| |
| /* Don't allow autosuspend if the device will need |
| * a reset-resume and any of its interface drivers |
| * doesn't include support or needs remote wakeup. |
| */ |
| 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 (w && !device_can_wakeup(&udev->dev)) { |
| dev_dbg(&udev->dev, "remote wakeup needed for autosuspend\n"); |
| return -EOPNOTSUPP; |
| } |
| udev->do_remote_wakeup = w; |
| return 0; |
| } |
| |
| int usb_runtime_suspend(struct device *dev) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| int status; |
| |
| /* A USB device can be suspended if it passes the various autosuspend |
| * checks. Runtime suspend for a USB device means suspending all the |
| * interfaces and then the device itself. |
| */ |
| if (autosuspend_check(udev) != 0) |
| return -EAGAIN; |
| |
| status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND); |
| /* The PM core reacts badly unless the return code is 0, |
| * -EAGAIN, or -EBUSY, so always return -EBUSY on an error. |
| */ |
| if (status != 0) |
| return -EBUSY; |
| return status; |
| } |
| |
| int usb_runtime_resume(struct device *dev) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| int status; |
| |
| /* Runtime resume for a USB device means resuming both the device |
| * and all its interfaces. |
| */ |
| status = usb_resume_both(udev, PMSG_AUTO_RESUME); |
| return status; |
| } |
| |
| int usb_runtime_idle(struct device *dev) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| |
| /* An idle USB device can be suspended if it passes the various |
| * autosuspend checks. |
| */ |
| if (autosuspend_check(udev) == 0) |
| pm_runtime_autosuspend(dev); |
| return 0; |
| } |
| |
| #endif /* CONFIG_USB_SUSPEND */ |
| |
| struct bus_type usb_bus_type = { |
| .name = "usb", |
| .match = usb_device_match, |
| .uevent = usb_uevent, |
| }; |