Input: alps - process_bitmap: don't invert the Y-axis on Rushmore

Rushmore models don't have the Y-axis data in the bitmap inverted. Since
we now have 2 different Y orientations, make the Y bitmap data processing
use a forward loop like the X bitmap data processing, unifying the 2,
and invert the data later, except on Rushmore.

So far no-one has noticed this because the synaptics driver only uses the
non mt coordinates (except on clickpads, and there are no alps clickpads
using process_bitmap).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

2 files changed, 12 insertions, 9 deletions

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index cc197d7473c9..abe9f9bdf69a 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -99,6 +99,7 @@ static const struct alps_nibble_commands alps_v6_nibble_commands[] = {
 #define ALPS_FOUR_BUTTONS       0x40    /* 4 direction button present */
 #define ALPS_PS2_INTERLEAVED    0x80    /* 3-byte PS/2 packet interleaved with
                                            6-byte ALPS packet */
+#define ALPS_IS_RUSHMORE        0x100   /* device is a rushmore */
 
 static const struct alps_model_info alps_model_data[] = {
         { { 0x32, 0x02, 0x14 }, 0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT },  /* Toshiba Salellite Pro M10 */
@@ -376,15 +377,10 @@ static int alps_process_bitmap(struct alps_data *priv,
                 prev_bit = bit;
         }
 
-        /*
-         * y bitmap is reversed for what we need (lower positions are in
-         * higher bits), so we process from the top end.
-         */
-        y_map = y_map << (sizeof(y_map) * BITS_PER_BYTE - priv->y_bits);
         prev_bit = 0;
         point = &y_low;
-        for (i = 0; y_map != 0; i++, y_map <<= 1) {
-                bit = y_map & (1 << (sizeof(y_map) * BITS_PER_BYTE - 1));
+        for (i = 0; y_map != 0; i++, y_map >>= 1) {
+                bit = y_map & 1;
                 if (bit) {
                         if (!prev_bit) {
                                 point->start_bit = i;
@@ -435,6 +431,12 @@ static int alps_process_bitmap(struct alps_data *priv,
                (2 * y_high.start_bit + y_high.num_bits - 1)) /
               (2 * (priv->y_bits - 1));
 
+        /* y-bitmap order is reversed, except on rushmore */
+        if (!(priv->flags & ALPS_IS_RUSHMORE)) {
+                *y1 = priv->y_max - *y1;
+                *y2 = priv->y_max - *y2;
+        }
+
         return fingers;
 }
 
@@ -1981,6 +1983,7 @@ static int alps_identify(struct psmouse *psmouse, struct alps_data *priv)
                 priv->decode_fields = alps_decode_rushmore;
                 priv->x_bits = 16;
                 priv->y_bits = 12;
+                priv->flags |= ALPS_IS_RUSHMORE;
 
                 /* hack to make addr_command, nibble_command available */
                 psmouse->private = priv;
diff --git a/drivers/input/mouse/alps.h b/drivers/input/mouse/alps.h
index 03f88b6940c7..6d2666c0d63a 100644
--- a/drivers/input/mouse/alps.h
+++ b/drivers/input/mouse/alps.h
@@ -46,7 +46,7 @@ struct alps_model_info {
         unsigned char command_mode_resp;
         unsigned char proto_version;
         unsigned char byte0, mask0;
-        unsigned char flags;
+        int flags;
 };
 
 /**
@@ -142,7 +142,7 @@ struct alps_data {
         int addr_command;
         unsigned char proto_version;
         unsigned char byte0, mask0;
-        unsigned char flags;
+        int flags;
         int x_max;
         int y_max;
         int x_bits;