USB HID: add 'quirks' module parameter

Add a 'quirks' module parameter for the usbhid module, so users can
add or modify quirks at module load time.

Signed-off-by: Paul Walmsley <paul@booyaka.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/hid/usbhid/hid-quirks.c b/drivers/hid/usbhid/hid-quirks.c
index a5fc8b5144ef..27188bd1e851 100644
--- a/drivers/hid/usbhid/hid-quirks.c
+++ b/drivers/hid/usbhid/hid-quirks.c
@@ -576,6 +576,44 @@ static void usbhid_remove_all_dquirks(void)
 
 }
 
+/** 
+ * usbhid_quirks_init: apply USB HID quirks specified at module load time
+ */
+int usbhid_quirks_init(char **quirks_param)
+{
+        u16 idVendor, idProduct;
+        u32 quirks;
+        int n = 0, m;
+
+        for (; quirks_param[n] && n < MAX_USBHID_BOOT_QUIRKS; n++) {
+
+                m = sscanf(quirks_param[n], "0x%hx:0x%hx:0x%x",
+                                &idVendor, &idProduct, &quirks);
+
+                if (m != 3 ||
+                                usbhid_modify_dquirk(idVendor, idProduct, quirks) != 0) {
+                        printk(KERN_WARNING
+                                        "Could not parse HID quirk module param %s\n",
+                                        quirks_param[n]);
+                }
+        }
+
+        return 0;
+}
+
+/**
+ * usbhid_quirks_exit: release memory associated with dynamic_quirks
+ *
+ * Description:
+ *     Release all memory associated with dynamic quirks.  Called upon
+ *     module unload.
+ *
+ * Returns: nothing
+ */
+void usbhid_quirks_exit(void)
+{
+        usbhid_remove_all_dquirks();
+}
 
 /**
  * usbhid_exists_squirk: return any static quirks for a USB HID device