Re: [PATCH] Fix Alps Touchpad two finger scroll does not work on right side

[Takashi Iwai]

On Fri, 21 Jul 2017 08:53:05 +0200,
Takashi Iwai wrote:
> 
> On Fri, 21 Jul 2017 02:27:30 +0200,
> Masaki Ota wrote:
> > 
> > From: Masaki Ota <masaki.ota@xxxxxxxxxxx>
> > 
> > Fixed the issue that two finger scroll does not work correctly
> > on V8 protocol. The cause is that V8 protocol X-coordinate decode
> > is wrong at SS4 PLUS device. I added SS4 PLUS X decode definition.
> > 
> > Signed-off-by: Masaki Ota <masaki.ota@xxxxxxxxxxx>
> > Tested-by: Takashi Iwai <tiwai@xxxxxxx>
> 
> Please put Cc to stable, too, in addition to:
> 
> Fixes: e7348396c6d5 ("Input: ALPS - fix V8+ protocol handling (73 03 28)")
> 
> Mote to note: the problem itself was introduced even before the commit
> mentioned above.  But the two-finger scroll worked casually although
> it reported wrong values by some reason.  It got broken by the commit
> above because it changed x_max value, and now libinput correctly
> ignores the MT events at right-half of touchpad (the X coord is
> reported as doubled).
> 
> Also, one finger event is decoded differently, thus it didn't suffer
> from this problem.

Hi Dmitry, could you check this patch, in case you overlooked?


thanks,

Takashi


> 
> 
> thanks,
> 
> Takashi
> 
> > ---
> >  drivers/input/mouse/alps.c | 41 +++++++++++++++++++++++++++++++----------
> >  drivers/input/mouse/alps.h |  8 ++++++++
> >  2 files changed, 39 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
> > index f210e19ddba6..2627c724bb7c 100644
> > --- a/drivers/input/mouse/alps.c
> > +++ b/drivers/input/mouse/alps.c
> > @@ -1210,14 +1210,24 @@ static int alps_decode_ss4_v2(struct alps_fields *f,
> >  
> >  	case SS4_PACKET_ID_TWO:
> >  		if (priv->flags & ALPS_BUTTONPAD) {
> > -			f->mt[0].x = SS4_BTL_MF_X_V2(p, 0);
> > +			if (IS_SS4PLUS_DEV(priv->dev_id)) {
> > +				f->mt[0].x = SS4_PLUS_BTL_MF_X_V2(p, 0);
> > +				f->mt[1].x = SS4_PLUS_BTL_MF_X_V2(p, 1);
> > +			} else {
> > +				f->mt[0].x = SS4_BTL_MF_X_V2(p, 0);
> > +				f->mt[1].x = SS4_BTL_MF_X_V2(p, 1);
> > +			}
> >  			f->mt[0].y = SS4_BTL_MF_Y_V2(p, 0);
> > -			f->mt[1].x = SS4_BTL_MF_X_V2(p, 1);
> >  			f->mt[1].y = SS4_BTL_MF_Y_V2(p, 1);
> >  		} else {
> > -			f->mt[0].x = SS4_STD_MF_X_V2(p, 0);
> > +			if (IS_SS4PLUS_DEV(priv->dev_id)) {
> > +				f->mt[0].x = SS4_PLUS_STD_MF_X_V2(p, 0);
> > +				f->mt[1].x = SS4_PLUS_STD_MF_X_V2(p, 1);
> > +			} else {
> > +				f->mt[0].x = SS4_STD_MF_X_V2(p, 0);
> > +				f->mt[1].x = SS4_STD_MF_X_V2(p, 1);
> > +			}
> >  			f->mt[0].y = SS4_STD_MF_Y_V2(p, 0);
> > -			f->mt[1].x = SS4_STD_MF_X_V2(p, 1);
> >  			f->mt[1].y = SS4_STD_MF_Y_V2(p, 1);
> >  		}
> >  		f->pressure = SS4_MF_Z_V2(p, 0) ? 0x30 : 0;
> > @@ -1234,16 +1244,27 @@ static int alps_decode_ss4_v2(struct alps_fields *f,
> >  
> >  	case SS4_PACKET_ID_MULTI:
> >  		if (priv->flags & ALPS_BUTTONPAD) {
> > -			f->mt[2].x = SS4_BTL_MF_X_V2(p, 0);
> > +			if (IS_SS4PLUS_DEV(priv->dev_id)) {
> > +				f->mt[0].x = SS4_PLUS_BTL_MF_X_V2(p, 0);
> > +				f->mt[1].x = SS4_PLUS_BTL_MF_X_V2(p, 1);
> > +			} else {
> > +				f->mt[2].x = SS4_BTL_MF_X_V2(p, 0);
> > +				f->mt[3].x = SS4_BTL_MF_X_V2(p, 1);
> > +			}
> > +
> >  			f->mt[2].y = SS4_BTL_MF_Y_V2(p, 0);
> > -			f->mt[3].x = SS4_BTL_MF_X_V2(p, 1);
> >  			f->mt[3].y = SS4_BTL_MF_Y_V2(p, 1);
> >  			no_data_x = SS4_MFPACKET_NO_AX_BL;
> >  			no_data_y = SS4_MFPACKET_NO_AY_BL;
> >  		} else {
> > -			f->mt[2].x = SS4_STD_MF_X_V2(p, 0);
> > +			if (IS_SS4PLUS_DEV(priv->dev_id)) {
> > +				f->mt[0].x = SS4_PLUS_STD_MF_X_V2(p, 0);
> > +				f->mt[1].x = SS4_PLUS_STD_MF_X_V2(p, 1);
> > +			} else {
> > +				f->mt[0].x = SS4_STD_MF_X_V2(p, 0);
> > +				f->mt[1].x = SS4_STD_MF_X_V2(p, 1);
> > +			}
> >  			f->mt[2].y = SS4_STD_MF_Y_V2(p, 0);
> > -			f->mt[3].x = SS4_STD_MF_X_V2(p, 1);
> >  			f->mt[3].y = SS4_STD_MF_Y_V2(p, 1);
> >  			no_data_x = SS4_MFPACKET_NO_AX;
> >  			no_data_y = SS4_MFPACKET_NO_AY;
> > @@ -2536,8 +2557,8 @@ static int alps_set_defaults_ss4_v2(struct psmouse *psmouse,
> >  
> >  	memset(otp, 0, sizeof(otp));
> >  
> > -	if (alps_get_otp_values_ss4_v2(psmouse, 0, &otp[0][0]) ||
> > -	    alps_get_otp_values_ss4_v2(psmouse, 1, &otp[1][0]))
> > +	if (alps_get_otp_values_ss4_v2(psmouse, 1, &otp[1][0]) ||
> > +	    alps_get_otp_values_ss4_v2(psmouse, 0, &otp[0][0]))
> >  		return -1;
> >  
> >  	alps_update_device_area_ss4_v2(otp, priv);
> > diff --git a/drivers/input/mouse/alps.h b/drivers/input/mouse/alps.h
> > index 4334f2805d93..75542199edda 100644
> > --- a/drivers/input/mouse/alps.h
> > +++ b/drivers/input/mouse/alps.h
> > @@ -99,6 +99,10 @@ enum SS4_PACKET_ID {
> >  				 ((_b[1 + _i * 3]  << 5) & 0x1F00)	\
> >  				)
> >  
> > +#define SS4_PLUS_STD_MF_X_V2(_b, _i) (((_b[0 + (_i) * 3] << 4) & 0x0070) | \
> > +				 ((_b[1 + (_i) * 3]  << 4) & 0x0F80)	\
> > +				)
> > +
> >  #define SS4_STD_MF_Y_V2(_b, _i)	(((_b[1 + (_i) * 3] << 3) & 0x0010) |	\
> >  				 ((_b[2 + (_i) * 3] << 5) & 0x01E0) |	\
> >  				 ((_b[2 + (_i) * 3] << 4) & 0x0E00)	\
> > @@ -108,6 +112,10 @@ enum SS4_PACKET_ID {
> >  				 ((_b[0 + (_i) * 3] >> 3) & 0x0010)	\
> >  				)
> >  
> > +#define SS4_PLUS_BTL_MF_X_V2(_b, _i) (SS4_PLUS_STD_MF_X_V2(_b, _i) |	\
> > +				 ((_b[0 + (_i) * 3] >> 4) & 0x0008)	\
> > +				)
> > +
> >  #define SS4_BTL_MF_Y_V2(_b, _i)	(SS4_STD_MF_Y_V2(_b, _i) | \
> >  				 ((_b[0 + (_i) * 3] >> 3) & 0x0008)	\
> >  				)
> > -- 
> > 2.11.0
> >