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authorGabor Juhos <juhosg@openwrt.org>2010-12-17 17:10:08 +0000
committerGabor Juhos <juhosg@openwrt.org>2010-12-17 17:10:08 +0000
commit3b8a79395ae9042a0717ebbb05996c52d9f320f3 (patch)
treebd6ad69240de1e72f1f06c001e878860f9961249 /target/linux/generic/patches-2.6.32
parent0d01356fc69e536f51d8694689bf1b55ea4b508d (diff)
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generic: add usb_find_device_by_name helper
SVN-Revision: 24645
Diffstat (limited to 'target/linux/generic/patches-2.6.32')
-rw-r--r--target/linux/generic/patches-2.6.32/310-usb-add-usb_find_device_by_name.patch84
1 files changed, 84 insertions, 0 deletions
diff --git a/target/linux/generic/patches-2.6.32/310-usb-add-usb_find_device_by_name.patch b/target/linux/generic/patches-2.6.32/310-usb-add-usb_find_device_by_name.patch
new file mode 100644
index 0000000000..dd976d673e
--- /dev/null
+++ b/target/linux/generic/patches-2.6.32/310-usb-add-usb_find_device_by_name.patch
@@ -0,0 +1,84 @@
+--- a/drivers/usb/core/usb.c
++++ b/drivers/usb/core/usb.c
+@@ -651,6 +651,71 @@ exit:
+ return dev;
+ }
+
++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_get_current_frame_number - return current bus frame number
+ * @dev: the device whose bus is being queried
+--- a/include/linux/usb.h
++++ b/include/linux/usb.h
+@@ -540,6 +540,7 @@ extern int usb_reset_device(struct usb_d
+ extern void usb_queue_reset_device(struct usb_interface *dev);
+
+ extern struct usb_device *usb_find_device(u16 vendor_id, u16 product_id);
++extern struct usb_device *usb_find_device_by_name(const char *name);
+
+ /* USB autosuspend and autoresume */
+ #ifdef CONFIG_USB_SUSPEND