On Thu, Jan 30, 2014 at 10:48 AM, Jason Gerecke <killertofu@xxxxxxxxx> wrote:
> The 0xEC sensor is used in multiple tablet PCs and curiously has
> versions that report 256 levels of pressure (Samsung Slate 7)
> as well as versions that report 1024 levels (Lenovo Thinkpad Yoga).
> To allow both versions to work properly, we allow the value of
> HID_USAGE_PRESSURE reported to override pressure_max.
>
> Signed-off-by: Jason Gerecke <killertofu@xxxxxxxxx>
> ---
> drivers/input/tablet/wacom_sys.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c
> index 5be6177..611fc39 100644
> --- a/drivers/input/tablet/wacom_sys.c
> +++ b/drivers/input/tablet/wacom_sys.c
> @@ -24,6 +24,7 @@
> #define HID_USAGE 0x09
> #define HID_USAGE_X ((HID_USAGE_PAGE_DESKTOP << 16) | 0x30)
> #define HID_USAGE_Y ((HID_USAGE_PAGE_DESKTOP << 16) | 0x31)
> +#define HID_USAGE_PRESSURE ((HID_USAGE_PAGE_DIGITIZER << 16) | 0x30)
> #define HID_USAGE_X_TILT ((HID_USAGE_PAGE_DIGITIZER << 16) | 0x3d)
> #define HID_USAGE_Y_TILT ((HID_USAGE_PAGE_DIGITIZER << 16) | 0x3e)
> #define HID_USAGE_FINGER ((HID_USAGE_PAGE_DIGITIZER << 16) | 0x22)
> @@ -465,6 +466,14 @@ static int wacom_parse_hid(struct usb_interface *intf,
> wacom_retrieve_report_data(intf, features);
> i++;
> break;
> +
> + case HID_USAGE_PRESSURE:
> + if (pen) {
> + features->pressure_max =
> + get_unaligned_le16(&report[i + 3]);
> + i += 4;
> + }
> + break;
> }
> break;
>
> --
> 1.8.5.3
>
Tested-by: Aaron Skomra <Aaron.Skomra@xxxxxxxxx>
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