Input: ALPS - add support for "Rushmore" touchpads

Rushmore touchpads are found on Dell E6230/E6430/E6530.  They use the V3
protocol with slightly tweaked init sequences and report formats.

The E7 report is 73 03 0a, and the EC report is 88 08 1d

Credits: Emmanuel Thome reported the MT bitmap changes.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Tested-by: Dave Turvene <dturvene@dahetral.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index 270b7deefe5b..bf2fa51853e3 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -479,6 +479,14 @@ static void alps_decode_pinnacle(struct alps_fields *f, unsigned char *p)
         alps_decode_buttons_v3(f, p);
 }
 
+static void alps_decode_rushmore(struct alps_fields *f, unsigned char *p)
+{
+        alps_decode_pinnacle(f, p);
+
+        f->x_map |= (p[5] & 0x10) << 11;
+        f->y_map |= (p[5] & 0x20) << 6;
+}
+
 static void alps_process_touchpad_packet_v3(struct psmouse *psmouse)
 {
         struct alps_data *priv = psmouse->private;
@@ -1329,6 +1337,40 @@ error:
         return -1;
 }
 
+static int alps_hw_init_rushmore_v3(struct psmouse *psmouse)
+{
+        struct ps2dev *ps2dev = &psmouse->ps2dev;
+        int reg_val, ret = -1;
+
+        if (alps_enter_command_mode(psmouse, NULL) ||
+            alps_command_mode_read_reg(psmouse, 0xc2d9) == -1 ||
+            alps_command_mode_write_reg(psmouse, 0xc2cb, 0x00))
+                goto error;
+
+        reg_val = alps_command_mode_read_reg(psmouse, 0xc2c6);
+        if (reg_val == -1)
+                goto error;
+        if (__alps_command_mode_write_reg(psmouse, reg_val & 0xfd))
+                goto error;
+
+        if (alps_command_mode_write_reg(psmouse, 0xc2c9, 0x64))
+                goto error;
+
+        /* enter absolute mode */
+        reg_val = alps_command_mode_read_reg(psmouse, 0xc2c4);
+        if (reg_val == -1)
+                goto error;
+        if (__alps_command_mode_write_reg(psmouse, reg_val | 0x02))
+                goto error;
+
+        alps_exit_command_mode(psmouse);
+        return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
+
+error:
+        alps_exit_command_mode(psmouse);
+        return ret;
+}
+
 /* Must be in command mode when calling this function */
 static int alps_absolute_mode_v4(struct psmouse *psmouse)
 {
@@ -1511,6 +1553,16 @@ static int alps_identify(struct psmouse *psmouse, struct alps_data *priv)
 
         if (alps_match_table(psmouse, priv, e7, ec) == 0) {
                 return 0;
+        } else if (ec[0] == 0x88 && ec[1] == 0x08) {
+                priv->proto_version = ALPS_PROTO_V3;
+                alps_set_defaults(priv);
+
+                priv->hw_init = alps_hw_init_rushmore_v3;
+                priv->decode_fields = alps_decode_rushmore;
+                priv->x_bits = 16;
+                priv->y_bits = 12;
+
+                return 0;
         } else if (ec[0] == 0x88 && ec[1] == 0x07 &&
                    ec[2] >= 0x90 && ec[2] <= 0x9d) {
                 priv->proto_version = ALPS_PROTO_V3;