linux-kernel - Re: [PATCH] Input: alps - Report pressure of v3 and v7 trackstick

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Date:   Tue, 27 Mar 2018 00:38:56 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Masaki Ota <masaki.ota@...alps.com>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: alps - Report pressure of v3 and v7 trackstick

On Monday 26 March 2018 15:37:32 Dmitry Torokhov wrote:
> 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@...il.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

Nope, we still have. See them in the alps_model_data table.

> 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
> > 
> 

-- 
Pali Rohár
pali.rohar@...il.com

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