generic: add usb_find_device_by_name helper

SVN-Revision: 24645

1 files changed, 84 insertions, 0 deletions

diff --git a/target/linux/generic/patches-2.6.34/310-usb-add-usb_find_device_by_name.patch b/target/linux/generic/patches-2.6.34/310-usb-add-usb_find_device_by_name.patch
new file mode 100644
index 0000000..89c3389
--- /dev/null
+++ b/target/linux/generic/patches-2.6.34/310-usb-add-usb_find_device_by_name.patch
@@ -0,0 +1,84 @@
+--- a/drivers/usb/core/usb.c
++++ b/drivers/usb/core/usb.c
+@@ -717,6 +717,71 @@ 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
+@@ -609,6 +609,7 @@ extern struct usb_host_interface *usb_fi
+ 		unsigned int iface_num,
+ 		unsigned int alt_num);
+ 
++extern struct usb_device *usb_find_device_by_name(const char *name);
+ 
+ /**
+  * usb_make_path - returns stable device path in the usb tree