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>
diff --git a/drivers/hid/hid-cypress.c b/drivers/hid/hid-cypress.c
index 998b6f4..4cd0e23 100644
--- a/drivers/hid/hid-cypress.c
+++ b/drivers/hid/hid-cypress.c
@@ -31,16 +31,16 @@
* Some USB barcode readers from cypress have usage min and usage max in
* the wrong order
*/
-static void cp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
- unsigned int rsize)
+static __u8 *cp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+ unsigned int *rsize)
{
unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
unsigned int i;
if (!(quirks & CP_RDESC_SWAPPED_MIN_MAX))
- return;
+ return rdesc;
- for (i = 0; i < rsize - 4; i++)
+ for (i = 0; i < *rsize - 4; i++)
if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) {
__u8 tmp;
@@ -50,6 +50,7 @@
rdesc[i + 3] = rdesc[i + 1];
rdesc[i + 1] = tmp;
}
+ return rdesc;
}
static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi,