Input: ALPS - fix two-finger scroll breakage in right side on ALPS touchpad

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.

Mote notes:
the problem manifests itself by the commit e7348396c6d5 ("Input: ALPS
- fix V8+ protocol handling (73 03 28)"), where a fix for the V8+
protocol was applied.  Although the culprit must have been present
beforehand, the two-finger scroll worked casually even with the
wrongly reported values by some reason.  It got broken by the commit
above just because it changed x_max value, and this made libinput
correctly figuring the MT events.  Since the X coord is reported as
falsely doubled, the events on the right-half side go outside the
boundary, thus they are no longer handled.  This resulted as a broken
two-finger scroll.

One finger event is decoded differently, and it didn't suffer from
this problem.  The problem was only about MT events. --tiwai

Fixes: e7348396c6d5 ("Input: ALPS - fix V8+ protocol handling (73 03 28)")
Signed-off-by: Masaki Ota <masaki.ota@jp.alps.com>
Tested-by: Takashi Iwai <tiwai@suse.de>
Tested-by: Paul Donohue <linux-kernel@PaulSD.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

2 files changed, 39 insertions, 10 deletions

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index 262d1057c1da..850b00e3ad8e 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -1215,14 +1215,24 @@ 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;
@@ -1239,16 +1249,27 @@ 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;
@@ -2541,8 +2562,8 @@ 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 ed2d6879fa52..c80a7c76cb76 100644
--- a/drivers/input/mouse/alps.h
+++ b/drivers/input/mouse/alps.h
@@ -100,6 +100,10 @@ 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)     \
@@ -109,6 +113,10 @@ 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)     \
                                 )