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-lg.c b/drivers/hid/hid-lg.c
index f6433d8..68c0b68 100644
--- a/drivers/hid/hid-lg.c
+++ b/drivers/hid/hid-lg.c
@@ -41,25 +41,26 @@
* above the logical maximum described in descriptor. This extends
* the original value of 0x28c of logical maximum to 0x104d
*/
-static void lg_report_fixup(struct hid_device *hdev, __u8 *rdesc,
- unsigned int rsize)
+static __u8 *lg_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+ unsigned int *rsize)
{
unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
- if ((quirks & LG_RDESC) && rsize >= 90 && rdesc[83] == 0x26 &&
+ if ((quirks & LG_RDESC) && *rsize >= 90 && rdesc[83] == 0x26 &&
rdesc[84] == 0x8c && rdesc[85] == 0x02) {
dev_info(&hdev->dev, "fixing up Logitech keyboard report "
"descriptor\n");
rdesc[84] = rdesc[89] = 0x4d;
rdesc[85] = rdesc[90] = 0x10;
}
- if ((quirks & LG_RDESC_REL_ABS) && rsize >= 50 &&
+ if ((quirks & LG_RDESC_REL_ABS) && *rsize >= 50 &&
rdesc[32] == 0x81 && rdesc[33] == 0x06 &&
rdesc[49] == 0x81 && rdesc[50] == 0x06) {
dev_info(&hdev->dev, "fixing up rel/abs in Logitech "
"report descriptor\n");
rdesc[33] = rdesc[50] = 0x02;
}
+ return rdesc;
}
#define lg_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \