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

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Date:   Mon, 26 Mar 2018 15:55:21 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Pali Rohár <pali.rohar@...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 Tue, Mar 27, 2018 at 12:38:56AM +0200, Pali Rohár wrote:
> 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.

Ah, I see now, OK. Applied, thank you.

> 
> > 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



-- 
Dmitry