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>

1 files changed, 19 insertions, 16 deletions

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index d6eb5ce1dd1..0c0c03a4e03 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -28,24 +28,16 @@
 #include "hcd.h"
 #include "usb.h"
 
-static int usb_match_one_id(struct usb_interface *interface,
-                            const struct usb_device_id *id);
-
-struct usb_dynid {
-        struct list_head node;
-        struct usb_device_id id;
-};
-
 #ifdef CONFIG_HOTPLUG
 
 /*
  * Adds a new dynamic USBdevice ID to this driver,
  * and cause the driver to probe for all devices again.
  */
-static ssize_t store_new_id(struct device_driver *driver,
-                            const char *buf, size_t count)
+ssize_t usb_store_new_id(struct usb_dynids *dynids,
+                         struct device_driver *driver,
+                         const char *buf, size_t count)
 {
-        struct usb_driver *usb_drv = to_usb_driver(driver);
         struct usb_dynid *dynid;
         u32 idVendor = 0;
         u32 idProduct = 0;
@@ -65,9 +57,9 @@ static ssize_t store_new_id(struct device_driver *driver,
         dynid->id.idProduct = idProduct;
         dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 
-        spin_lock(&usb_drv->dynids.lock);
-        list_add_tail(&usb_drv->dynids.list, &dynid->node);
-        spin_unlock(&usb_drv->dynids.lock);
+        spin_lock(&dynids->lock);
+        list_add_tail(&dynids->list, &dynid->node);
+        spin_unlock(&dynids->lock);
 
         if (get_driver(driver)) {
                 retval = driver_attach(driver);
@@ -78,6 +70,15 @@ static ssize_t store_new_id(struct device_driver *driver,
                 return retval;
         return count;
 }
+EXPORT_SYMBOL_GPL(usb_store_new_id);
+
+static ssize_t store_new_id(struct device_driver *driver,
+                            const char *buf, size_t count)
+{
+        struct usb_driver *usb_drv = to_usb_driver(driver);
+
+        return usb_store_new_id(&usb_drv->dynids, driver, buf, count);
+}
 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
 
 static int usb_create_newid_file(struct usb_driver *usb_drv)
@@ -365,8 +366,8 @@ void usb_driver_release_interface(struct usb_driver *driver,
 EXPORT_SYMBOL(usb_driver_release_interface);
 
 /* returns 0 if no match, 1 if match */
-static int usb_match_one_id(struct usb_interface *interface,
-                            const struct usb_device_id *id)
+int usb_match_one_id(struct usb_interface *interface,
+                     const struct usb_device_id *id)
 {
         struct usb_host_interface *intf;
         struct usb_device *dev;
@@ -432,6 +433,8 @@ static int usb_match_one_id(struct usb_interface *interface,
 
         return 1;
 }
+EXPORT_SYMBOL_GPL(usb_match_one_id);
+
 /**
  * usb_match_id - find first usb_device_id matching device or interface
  * @interface: the interface of interest