USB serial: add dynamic id support to usb-serial core

Thanks to Johannes Hölzl <johannes.hoelzl@gmx.de> for fixing a few
things and getting it all working properly.

This adds support for dynamic usb ids to the usb serial core.  The file
"new_id" will show up under the usb serial driver, not the usb driver
associated with the usb-serial driver (yeah, it can be a bit confusing
at first glance...)

This patch also modifies the USB core to allow the usb-serial core to
reuse much of the dynamic id logic.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Johannes Hölzl <johannes.hoelzl@gmx.de>

2 files changed, 17 insertions, 0 deletions

diff --git a/include/linux/usb.h b/include/linux/usb.h
index f3b21636c9df..3cb9285df2d1 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -476,6 +476,8 @@ extern void usb_driver_release_interface(struct usb_driver *driver,
                         struct usb_interface *iface);
 const struct usb_device_id *usb_match_id(struct usb_interface *interface,
                                          const struct usb_device_id *id);
+extern int usb_match_one_id(struct usb_interface *interface,
+                            const struct usb_device_id *id);
 
 extern struct usb_interface *usb_find_interface(struct usb_driver *drv,
                 int minor);
@@ -724,11 +726,21 @@ static inline int usb_endpoint_is_isoc_out(const struct usb_endpoint_descriptor
 
 /* ----------------------------------------------------------------------- */
 
+/* Stuff for dynamic usb ids */
 struct usb_dynids {
         spinlock_t lock;
         struct list_head list;
 };
 
+struct usb_dynid {
+        struct list_head node;
+        struct usb_device_id id;
+};
+
+extern ssize_t usb_store_new_id(struct usb_dynids *dynids,
+                                struct device_driver *driver,
+                                const char *buf, size_t count);
+
 /**
  * struct usbdrv_wrap - wrapper for driver-model structure
  * @driver: The driver-model core driver structure.
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index 10f99e5f1a97..33dcd8576696 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -179,6 +179,9 @@ static inline void usb_set_serial_data (struct usb_serial *serial, void *data)
  *      memory structure allocation at this point in time.
  * @shutdown: pointer to the driver's shutdown function.  This will be
  *      called when the device is removed from the system.
+ * @usb_driver: pointer to the struct usb_driver that controls this
+ *      device.  This is necessary to allow dynamic ids to be added to
+ *      the driver from sysfs.
  *
  * This structure is defines a USB Serial driver.  It provides all of
  * the information that the USB serial core code needs.  If the function
@@ -202,6 +205,8 @@ struct usb_serial_driver {
 
         struct list_head        driver_list;
         struct device_driver    driver;
+        struct usb_driver       *usb_driver;
+        struct usb_dynids       dynids;
 
         int (*probe) (struct usb_serial *serial, const struct usb_device_id *id);
         int (*attach) (struct usb_serial *serial);