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SubjectRe: [PATCH] Input: alps - Report pressure of v3 and v7 trackstick
Hi Pali,

On Wed, Mar 21, 2018 at 09:07:36PM +0100, Pali Rohár wrote:
> ALPS v3 and v7 packet formats reports trackstick pressure. This information
> is already parsed in unused "z" variable.
>
> ALPS SS4 S2 devices already reports trackstick pressure as ABS_PRESSURE
> attribute, therefore reports pressure in the same way also for v3 and v7.
>
> This patch also updates parsing v3 pressure information, it is also stored
> in 7 bits.
>
> Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
> ---
> drivers/input/mouse/alps.c | 10 ++++++----
> 1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
> index 010c1bcdb06d..0a9e6a3a2f9f 100644
> --- a/drivers/input/mouse/alps.c
> +++ b/drivers/input/mouse/alps.c
> @@ -139,11 +139,11 @@ static const struct alps_model_info alps_model_data[] = {
> };
>
> static const struct alps_protocol_info alps_v3_protocol_data = {
> - ALPS_PROTO_V3, 0x8f, 0x8f, ALPS_DUALPOINT
> + ALPS_PROTO_V3, 0x8f, 0x8f, ALPS_DUALPOINT | ALPS_DUALPOINT_WITH_PRESSURE

It seems that with these changes we no longer have trackpoints that do
not report pressure in ALPS. Should we get rid of
ALPS_DUALPOINT_WITH_PRESSURE and clean up the code a bit?

Thanks.

> };
>
> static const struct alps_protocol_info alps_v3_rushmore_data = {
> - ALPS_PROTO_V3_RUSHMORE, 0x8f, 0x8f, ALPS_DUALPOINT
> + ALPS_PROTO_V3_RUSHMORE, 0x8f, 0x8f, ALPS_DUALPOINT | ALPS_DUALPOINT_WITH_PRESSURE
> };
>
> static const struct alps_protocol_info alps_v4_protocol_data = {
> @@ -155,7 +155,7 @@ static const struct alps_protocol_info alps_v5_protocol_data = {
> };
>
> static const struct alps_protocol_info alps_v7_protocol_data = {
> - ALPS_PROTO_V7, 0x48, 0x48, ALPS_DUALPOINT
> + ALPS_PROTO_V7, 0x48, 0x48, ALPS_DUALPOINT | ALPS_DUALPOINT_WITH_PRESSURE
> };
>
> static const struct alps_protocol_info alps_v8_protocol_data = {
> @@ -583,7 +583,7 @@ static void alps_process_trackstick_packet_v3(struct psmouse *psmouse)
>
> x = (s8)(((packet[0] & 0x20) << 2) | (packet[1] & 0x7f));
> y = (s8)(((packet[0] & 0x10) << 3) | (packet[2] & 0x7f));
> - z = (packet[4] & 0x7c) >> 2;
> + z = packet[4] & 0x7c;
>
> /*
> * The x and y values tend to be quite large, and when used
> @@ -595,6 +595,7 @@ static void alps_process_trackstick_packet_v3(struct psmouse *psmouse)
>
> input_report_rel(dev, REL_X, x);
> input_report_rel(dev, REL_Y, -y);
> + input_report_abs(dev, ABS_PRESSURE, z);
>
> /*
> * Most ALPS models report the trackstick buttons in the touchpad
> @@ -1118,6 +1119,7 @@ static void alps_process_trackstick_packet_v7(struct psmouse *psmouse)
>
> input_report_rel(dev2, REL_X, (char)x);
> input_report_rel(dev2, REL_Y, -((char)y));
> + input_report_abs(dev2, ABS_PRESSURE, z);
>
> input_report_key(dev2, BTN_LEFT, left);
> input_report_key(dev2, BTN_RIGHT, right);
> --
> 2.11.0
>

--
Dmitry

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