diff options
Diffstat (limited to 'target/linux/generic/patches-3.3/820-usb_add_usb_find_device_by_name.patch')
| -rw-r--r-- | target/linux/generic/patches-3.3/820-usb_add_usb_find_device_by_name.patch | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.3/820-usb_add_usb_find_device_by_name.patch b/target/linux/generic/patches-3.3/820-usb_add_usb_find_device_by_name.patch new file mode 100644 index 000000000..ee50ff90e --- /dev/null +++ b/target/linux/generic/patches-3.3/820-usb_add_usb_find_device_by_name.patch @@ -0,0 +1,84 @@ +--- a/drivers/usb/core/usb.c ++++ b/drivers/usb/core/usb.c +@@ -652,6 +652,71 @@ int __usb_get_extra_descriptor(char *buf + } + EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor); + ++static struct usb_device *match_device_name(struct usb_device *dev, ++ const char *name) ++{ ++ struct usb_device *ret_dev = NULL; ++ int child; ++ ++ dev_dbg(&dev->dev, "check for name %s ...\n", name); ++ ++ /* see if this device matches */ ++ if (strcmp(dev_name(&dev->dev), name) == 0 ) { ++ dev_dbg(&dev->dev, "matched this device!\n"); ++ ret_dev = usb_get_dev(dev); ++ goto exit; ++ } ++ ++ /* look through all of the children of this device */ ++ for (child = 0; child < dev->maxchild; ++child) { ++ if (dev->children[child]) { ++ usb_lock_device(dev->children[child]); ++ ret_dev = match_device_name(dev->children[child], name); ++ usb_unlock_device(dev->children[child]); ++ if (ret_dev) ++ goto exit; ++ } ++ } ++exit: ++ return ret_dev; ++} ++ ++/** ++ * usb_find_device_by_name - find a specific usb device in the system ++ * @name: the name of the device to find ++ * ++ * Returns a pointer to a struct usb_device if such a specified usb ++ * device is present in the system currently. The usage count of the ++ * device will be incremented if a device is found. Make sure to call ++ * usb_put_dev() when the caller is finished with the device. ++ * ++ * If a device with the specified bus id is not found, NULL is returned. ++ */ ++struct usb_device *usb_find_device_by_name(const char *name) ++{ ++ struct list_head *buslist; ++ struct usb_bus *bus; ++ struct usb_device *dev = NULL; ++ ++ mutex_lock(&usb_bus_list_lock); ++ for (buslist = usb_bus_list.next; ++ buslist != &usb_bus_list; ++ buslist = buslist->next) { ++ bus = container_of(buslist, struct usb_bus, bus_list); ++ if (!bus->root_hub) ++ continue; ++ usb_lock_device(bus->root_hub); ++ dev = match_device_name(bus->root_hub, name); ++ usb_unlock_device(bus->root_hub); ++ if (dev) ++ goto exit; ++ } ++exit: ++ mutex_unlock(&usb_bus_list_lock); ++ return dev; ++} ++EXPORT_SYMBOL_GPL(usb_find_device_by_name); ++ + /** + * usb_alloc_coherent - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP + * @dev: device the buffer will be used with +--- a/include/linux/usb.h ++++ b/include/linux/usb.h +@@ -531,6 +531,7 @@ extern int usb_lock_device_for_reset(str + extern int usb_reset_device(struct usb_device *dev); + extern void usb_queue_reset_device(struct usb_interface *dev); + ++extern struct usb_device *usb_find_device_by_name(const char *name); + + /* USB autosuspend and autoresume */ + #ifdef CONFIG_USB_SUSPEND |