diff options
| author | Frank Yang <puilp0502@gmail.com> | 2020-08-21 03:16:50 +0900 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2020-10-23 13:23:44 +0200 |
| commit | 652f3d00de523a17b0cebe7b90debccf13aa8c31 (patch) | |
| tree | 67ea2fbd48bbc54f38728d4540c1747a9c6077de /drivers/hid/hid-ids.h | |
| parent | 3c785a06dee99501a17f8e8cf29b2b7e3f1e94ea (diff) | |
HID: cypress: Support Varmilo Keyboards' media hotkeys
The Varmilo VA104M Keyboard (04b4:07b1, reported as Varmilo Z104M)
exposes media control hotkeys as a USB HID consumer control device, but
these keys do not work in the current (5.8-rc1) kernel due to the
incorrect HID report descriptor. Fix the problem by modifying the
internal HID report descriptor.
More specifically, the keyboard report descriptor specifies the
logical boundary as 572~10754 (0x023c ~ 0x2a02) while the usage
boundary is specified as 0~10754 (0x00 ~ 0x2a02). This results in an
incorrect interpretation of input reports, causing inputs to be ignored.
By setting the Logical Minimum to zero, we align the logical boundary
with the Usage ID boundary.
Some notes:
* There seem to be multiple variants of the VA104M keyboard. This
patch specifically targets 04b4:07b1 variant.
* The device works out-of-the-box on Windows platform with the generic
consumer control device driver (hidserv.inf). This suggests that
Windows either ignores the Logical Minimum/Logical Maximum or
interprets the Usage ID assignment differently from the linux
implementation; Maybe there are other devices out there that only
works on Windows due to this problem?
Signed-off-by: Frank Yang <puilp0502@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-ids.h')
| -rw-r--r-- | drivers/hid/hid-ids.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h index 49d68bbf4852..81d99c47c2e5 100644 --- a/drivers/hid/hid-ids.h +++ b/drivers/hid/hid-ids.h @@ -331,6 +331,8 @@ #define USB_DEVICE_ID_CYPRESS_BARCODE_4 0xed81 #define USB_DEVICE_ID_CYPRESS_TRUETOUCH 0xc001 +#define USB_DEVICE_ID_CYPRESS_VARMILO_VA104M_07B1 0X07b1 + #define USB_VENDOR_ID_DATA_MODUL 0x7374 #define USB_VENDOR_ID_DATA_MODUL_EASYMAXTOUCH 0x1201 |