ChangeSet 1.1254.1.81, 2003/06/02 10:38:03-07:00, [EMAIL PROTECTED]
[PATCH] USB: add usb_find_device() function to USB core.
drivers/usb/core/usb.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/usb.h | 2 +
2 files changed, 67 insertions(+)
diff -Nru a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
--- a/drivers/usb/core/usb.c Mon Jun 2 11:19:56 2003
+++ b/drivers/usb/core/usb.c Mon Jun 2 11:19:56 2003
@@ -731,6 +731,70 @@
}
+static struct usb_device *match_device(struct usb_device *dev,
+ u16 vendor_id, u16 product_id)
+{
+ struct usb_device *ret_dev = NULL;
+ int child;
+
+ dbg("looking at vendor %d, product %d",
+ dev->descriptor.idVendor,
+ dev->descriptor.idProduct);
+
+ /* see if this device matches */
+ if ((dev->descriptor.idVendor == vendor_id) &&
+ (dev->descriptor.idProduct == product_id)) {
+ dbg ("found the device!");
+ 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]) {
+ ret_dev = match_device(dev->children[child],
+ vendor_id, product_id);
+ if (ret_dev)
+ goto exit;
+ }
+ }
+exit:
+ return ret_dev;
+}
+
+/**
+ * usb_find_device - find a specific usb device in the system
+ * @vendor_id: the vendor id of the device to find
+ * @product_id: the product id 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 vendor and product id is not found,
+ * NULL is returned.
+ */
+struct usb_device *usb_find_device(u16 vendor_id, u16 product_id)
+{
+ struct list_head *buslist;
+ struct usb_bus *bus;
+ struct usb_device *dev = NULL;
+
+ down(&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);
+ dev = match_device(bus->root_hub, vendor_id, product_id);
+ if (dev)
+ goto exit;
+ }
+exit:
+ up(&usb_bus_list_lock);
+ return dev;
+}
+
/**
* usb_get_current_frame_number - return current bus frame number
* @dev: the device whose bus is being queried
@@ -1510,6 +1574,7 @@
EXPORT_SYMBOL(__usb_get_extra_descriptor);
+EXPORT_SYMBOL(usb_find_device);
EXPORT_SYMBOL(usb_get_current_frame_number);
EXPORT_SYMBOL (usb_buffer_alloc);
diff -Nru a/include/linux/usb.h b/include/linux/usb.h
--- a/include/linux/usb.h Mon Jun 2 11:19:56 2003
+++ b/include/linux/usb.h Mon Jun 2 11:19:56 2003
@@ -278,6 +278,8 @@
/* mostly for devices emulating SCSI over USB */
extern int usb_reset_device(struct usb_device *dev);
+extern struct usb_device *usb_find_device(u16 vendor_id, u16 product_id);
+
/* for drivers using iso endpoints */
extern int usb_get_current_frame_number (struct usb_device *usb_dev);
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