HID: allow resizing and replacing report descriptors

Update hid_driver's report_fixup prototype to allow changing report
descriptor size and/or returning completely different report descriptor.
Update existing usage accordingly.

This is to give more freedom in descriptor fixup and to allow having a whole
fixed descriptor in the code for the sake of readability.

Signed-off-by: Nikolai Kondrashov <spbnick@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/hid/hid-cherry.c b/drivers/hid/hid-cherry.c
index 24663a8717b1..e880086c2311 100644
--- a/drivers/hid/hid-cherry.c
+++ b/drivers/hid/hid-cherry.c
@@ -26,15 +26,16 @@
  * Cherry Cymotion keyboard have an invalid HID report descriptor,
  * that needs fixing before we can parse it.
  */
-static void ch_report_fixup(struct hid_device *hdev, __u8 *rdesc,
-                unsigned int rsize)
+static __u8 *ch_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+                unsigned int *rsize)
 {
-        if (rsize >= 17 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
+        if (*rsize >= 17 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
                 dev_info(&hdev->dev, "fixing up Cherry Cymotion report "
                                 "descriptor\n");
                 rdesc[11] = rdesc[16] = 0xff;
                 rdesc[12] = rdesc[17] = 0x03;
         }
+        return rdesc;
 }
 
 #define ch_map_key_clear(c)     hid_map_usage_clear(hi, usage, bit, max, \