Input: ALPS - make the V3 packet field decoder "pluggable"

A number of different ALPS touchpad protocols can reuse
alps_process_touchpad_packet_v3() with small tweaks to the bitfield
decoding.  Create a new priv->decode_fields() callback that handles the
per-model differences.

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

2 files changed, 95 insertions, 44 deletions

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index 2cd8be774f91..270b7deefe5b 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -447,17 +447,49 @@ static void alps_process_trackstick_packet_v3(struct psmouse *psmouse)
         return;
 }
 
+static void alps_decode_buttons_v3(struct alps_fields *f, unsigned char *p)
+{
+        f->left = !!(p[3] & 0x01);
+        f->right = !!(p[3] & 0x02);
+        f->middle = !!(p[3] & 0x04);
+
+        f->ts_left = !!(p[3] & 0x10);
+        f->ts_right = !!(p[3] & 0x20);
+        f->ts_middle = !!(p[3] & 0x40);
+}
+
+static void alps_decode_pinnacle(struct alps_fields *f, unsigned char *p)
+{
+        f->first_mp = !!(p[4] & 0x40);
+        f->is_mp = !!(p[0] & 0x40);
+
+        f->fingers = (p[5] & 0x3) + 1;
+        f->x_map = ((p[4] & 0x7e) << 8) |
+                   ((p[1] & 0x7f) << 2) |
+                   ((p[0] & 0x30) >> 4);
+        f->y_map = ((p[3] & 0x70) << 4) |
+                   ((p[2] & 0x7f) << 1) |
+                   (p[4] & 0x01);
+
+        f->x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) |
+               ((p[0] & 0x30) >> 4);
+        f->y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f);
+        f->z = p[5] & 0x7f;
+
+        alps_decode_buttons_v3(f, p);
+}
+
 static void alps_process_touchpad_packet_v3(struct psmouse *psmouse)
 {
         struct alps_data *priv = psmouse->private;
         unsigned char *packet = psmouse->packet;
         struct input_dev *dev = psmouse->dev;
         struct input_dev *dev2 = priv->dev2;
-        int x, y, z;
-        int left, right, middle;
         int x1 = 0, y1 = 0, x2 = 0, y2 = 0;
         int fingers = 0, bmap_fingers;
-        unsigned int x_bitmap, y_bitmap;
+        struct alps_fields f;
+
+        priv->decode_fields(&f, packet);
 
         /*
          * There's no single feature of touchpad position and bitmap packets
@@ -472,17 +504,10 @@ static void alps_process_touchpad_packet_v3(struct psmouse *psmouse)
                  * packet. Check for this, and when it happens process the
                  * position packet as usual.
                  */
-                if (packet[0] & 0x40) {
-                        fingers = (packet[5] & 0x3) + 1;
-                        x_bitmap = ((packet[4] & 0x7e) << 8) |
-                                   ((packet[1] & 0x7f) << 2) |
-                                   ((packet[0] & 0x30) >> 4);
-                        y_bitmap = ((packet[3] & 0x70) << 4) |
-                                   ((packet[2] & 0x7f) << 1) |
-                                   (packet[4] & 0x01);
-
+                if (f.is_mp) {
+                        fingers = f.fingers;
                         bmap_fingers = alps_process_bitmap(priv,
-                                                           x_bitmap, y_bitmap,
+                                                           f.x_map, f.y_map,
                                                            &x1, &y1, &x2, &y2);
 
                         /*
@@ -493,7 +518,7 @@ static void alps_process_touchpad_packet_v3(struct psmouse *psmouse)
                                 fingers = bmap_fingers;
 
                         /* Now process position packet */
-                        packet = priv->multi_data;
+                        priv->decode_fields(&f, priv->multi_data);
                 } else {
                         priv->multi_packet = 0;
                 }
@@ -507,10 +532,10 @@ static void alps_process_touchpad_packet_v3(struct psmouse *psmouse)
          * out misidentified bitmap packets, we reject anything with this
          * bit set.
          */
-        if (packet[0] & 0x40)
+        if (f.is_mp)
                 return;
 
-        if (!priv->multi_packet && (packet[4] & 0x40)) {
+        if (!priv->multi_packet && f.first_mp) {
                 priv->multi_packet = 1;
                 memcpy(priv->multi_data, packet, sizeof(priv->multi_data));
                 return;
@@ -518,22 +543,13 @@ static void alps_process_touchpad_packet_v3(struct psmouse *psmouse)
 
         priv->multi_packet = 0;
 
-        left = packet[3] & 0x01;
-        right = packet[3] & 0x02;
-        middle = packet[3] & 0x04;
-
-        x = ((packet[1] & 0x7f) << 4) | ((packet[4] & 0x30) >> 2) |
-            ((packet[0] & 0x30) >> 4);
-        y = ((packet[2] & 0x7f) << 4) | (packet[4] & 0x0f);
-        z = packet[5] & 0x7f;
-
         /*
          * Sometimes the hardware sends a single packet with z = 0
          * in the middle of a stream. Real releases generate packets
          * with x, y, and z all zero, so these seem to be flukes.
          * Ignore them.
          */
-        if (x && y && !z)
+        if (f.x && f.y && !f.z)
                 return;
 
         /*
@@ -541,12 +557,12 @@ static void alps_process_touchpad_packet_v3(struct psmouse *psmouse)
          * to rely on ST data.
          */
         if (!fingers) {
-                x1 = x;
-                y1 = y;
-                fingers = z > 0 ? 1 : 0;
+                x1 = f.x;
+                y1 = f.y;
+                fingers = f.z > 0 ? 1 : 0;
         }
 
-        if (z >= 64)
+        if (f.z >= 64)
                 input_report_key(dev, BTN_TOUCH, 1);
         else
                 input_report_key(dev, BTN_TOUCH, 0);
@@ -555,26 +571,22 @@ static void alps_process_touchpad_packet_v3(struct psmouse *psmouse)
 
         input_mt_report_finger_count(dev, fingers);
 
-        input_report_key(dev, BTN_LEFT, left);
-        input_report_key(dev, BTN_RIGHT, right);
-        input_report_key(dev, BTN_MIDDLE, middle);
+        input_report_key(dev, BTN_LEFT, f.left);
+        input_report_key(dev, BTN_RIGHT, f.right);
+        input_report_key(dev, BTN_MIDDLE, f.middle);
 
-        if (z > 0) {
-                input_report_abs(dev, ABS_X, x);
-                input_report_abs(dev, ABS_Y, y);
+        if (f.z > 0) {
+                input_report_abs(dev, ABS_X, f.x);
+                input_report_abs(dev, ABS_Y, f.y);
         }
-        input_report_abs(dev, ABS_PRESSURE, z);
+        input_report_abs(dev, ABS_PRESSURE, f.z);
 
         input_sync(dev);
 
         if (!(priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS)) {
-                left = packet[3] & 0x10;
-                right = packet[3] & 0x20;
-                middle = packet[3] & 0x40;
-
-                input_report_key(dev2, BTN_LEFT, left);
-                input_report_key(dev2, BTN_RIGHT, right);
-                input_report_key(dev2, BTN_MIDDLE, middle);
+                input_report_key(dev2, BTN_LEFT, f.ts_left);
+                input_report_key(dev2, BTN_RIGHT, f.ts_right);
+                input_report_key(dev2, BTN_MIDDLE, f.ts_middle);
                 input_sync(dev2);
         }
 }
@@ -1428,6 +1440,7 @@ static void alps_set_defaults(struct alps_data *priv)
                 priv->hw_init = alps_hw_init_v3;
                 priv->process_packet = alps_process_packet_v3;
                 priv->set_abs_params = alps_set_abs_params_mt;
+                priv->decode_fields = alps_decode_pinnacle;
                 priv->nibble_commands = alps_v3_nibble_commands;
                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
                 break;
diff --git a/drivers/input/mouse/alps.h b/drivers/input/mouse/alps.h
index 5e638be33dc9..970480551b6e 100644
--- a/drivers/input/mouse/alps.h
+++ b/drivers/input/mouse/alps.h
@@ -60,6 +60,42 @@ struct alps_nibble_commands {
 };
 
 /**
+ * struct alps_fields - decoded version of the report packet
+ * @x_map: Bitmap of active X positions for MT.
+ * @y_map: Bitmap of active Y positions for MT.
+ * @fingers: Number of fingers for MT.
+ * @x: X position for ST.
+ * @y: Y position for ST.
+ * @z: Z position for ST.
+ * @first_mp: Packet is the first of a multi-packet report.
+ * @is_mp: Packet is part of a multi-packet report.
+ * @left: Left touchpad button is active.
+ * @right: Right touchpad button is active.
+ * @middle: Middle touchpad button is active.
+ * @ts_left: Left trackstick button is active.
+ * @ts_right: Right trackstick button is active.
+ * @ts_middle: Middle trackstick button is active.
+ */
+struct alps_fields {
+        unsigned int x_map;
+        unsigned int y_map;
+        unsigned int fingers;
+        unsigned int x;
+        unsigned int y;
+        unsigned int z;
+        unsigned int first_mp:1;
+        unsigned int is_mp:1;
+
+        unsigned int left:1;
+        unsigned int right:1;
+        unsigned int middle:1;
+
+        unsigned int ts_left:1;
+        unsigned int ts_right:1;
+        unsigned int ts_middle:1;
+};
+
+/**
  * struct alps_data - private data structure for the ALPS driver
  * @dev2: "Relative" device used to report trackstick or mouse activity.
  * @phys: Physical path for the relative device.
@@ -78,6 +114,7 @@ struct alps_nibble_commands {
  * @y_bits: Number of Y bits in the MT bitmap.
  * @hw_init: Protocol-specific hardware init function.
  * @process_packet: Protocol-specific function to process a report packet.
+ * @decode_fields: Protocol-specific function to read packet bitfields.
  * @set_abs_params: Protocol-specific function to configure the input_dev.
  * @prev_fin: Finger bit from previous packet.
  * @multi_packet: Multi-packet data in progress.
@@ -107,6 +144,7 @@ struct alps_data {
 
         int (*hw_init)(struct psmouse *psmouse);
         void (*process_packet)(struct psmouse *psmouse);
+        void (*decode_fields)(struct alps_fields *f, unsigned char *p);
         void (*set_abs_params)(struct alps_data *priv, struct input_dev *dev1);
 
         int prev_fin;