Input: ALPS - use function pointers for different protocol handlers

In anticipation of adding more ALPS protocols and more per-device quirks,
use function pointers instead of switch statements to call functions that
differ from one device to the next.

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, 54 insertions, 54 deletions

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index e6a27a5cbb1d..fe45687cf65a 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -114,6 +114,11 @@ static const struct alps_model_info alps_model_data[] = {
         { { 0x73, 0x02, 0x64 }, 0x8a, ALPS_PROTO_V4, 0x8f, 0x8f, 0 },
 };
 
+static void alps_set_abs_params_st(struct alps_data *priv,
+                                   struct input_dev *dev1);
+static void alps_set_abs_params_mt(struct alps_data *priv,
+                                   struct input_dev *dev1);
+
 /*
  * XXX - this entry is suspicious. First byte has zero lower nibble,
  * which is what a normal mouse would report. Also, the value 0x0e
@@ -695,24 +700,6 @@ static void alps_process_packet_v4(struct psmouse *psmouse)
         input_sync(dev);
 }
 
-static void alps_process_packet(struct psmouse *psmouse)
-{
-        struct alps_data *priv = psmouse->private;
-
-        switch (priv->proto_version) {
-        case ALPS_PROTO_V1:
-        case ALPS_PROTO_V2:
-                alps_process_packet_v1_v2(psmouse);
-                break;
-        case ALPS_PROTO_V3:
-                alps_process_packet_v3(psmouse);
-                break;
-        case ALPS_PROTO_V4:
-                alps_process_packet_v4(psmouse);
-                break;
-        }
-}
-
 static void alps_report_bare_ps2_packet(struct psmouse *psmouse,
                                         unsigned char packet[],
                                         bool report_buttons)
@@ -770,7 +757,7 @@ static psmouse_ret_t alps_handle_interleaved_ps2(struct psmouse *psmouse)
                         return PSMOUSE_BAD_DATA;
                 }
 
-                alps_process_packet(psmouse);
+                priv->process_packet(psmouse);
 
                 /* Continue with the next packet */
                 psmouse->packet[0] = psmouse->packet[6];
@@ -814,6 +801,7 @@ static psmouse_ret_t alps_handle_interleaved_ps2(struct psmouse *psmouse)
 static void alps_flush_packet(unsigned long data)
 {
         struct psmouse *psmouse = (struct psmouse *)data;
+        struct alps_data *priv = psmouse->private;
 
         serio_pause_rx(psmouse->ps2dev.serio);
 
@@ -831,7 +819,7 @@ static void alps_flush_packet(unsigned long data)
                                     "refusing packet %3ph (suspected interleaved ps/2)\n",
                                     psmouse->packet + 3);
                 } else {
-                        alps_process_packet(psmouse);
+                        priv->process_packet(psmouse);
                 }
                 psmouse->pktcnt = 0;
         }
@@ -876,7 +864,7 @@ static psmouse_ret_t alps_process_byte(struct psmouse *psmouse)
         }
 
         if (psmouse->pktcnt == psmouse->pktsize) {
-                alps_process_packet(psmouse);
+                priv->process_packet(psmouse);
                 return PSMOUSE_FULL_PACKET;
         }
 
@@ -1430,25 +1418,26 @@ error:
         return -1;
 }
 
-static int alps_hw_init(struct psmouse *psmouse)
+static void alps_set_defaults(struct alps_data *priv)
 {
-        struct alps_data *priv = psmouse->private;
-        int ret = -1;
-
         switch (priv->proto_version) {
         case ALPS_PROTO_V1:
         case ALPS_PROTO_V2:
-                ret = alps_hw_init_v1_v2(psmouse);
+                priv->hw_init = alps_hw_init_v1_v2;
+                priv->process_packet = alps_process_packet_v1_v2;
+                priv->set_abs_params = alps_set_abs_params_st;
                 break;
         case ALPS_PROTO_V3:
-                ret = alps_hw_init_v3(psmouse);
+                priv->hw_init = alps_hw_init_v3;
+                priv->process_packet = alps_process_packet_v3;
+                priv->set_abs_params = alps_set_abs_params_mt;
                 break;
         case ALPS_PROTO_V4:
-                ret = alps_hw_init_v4(psmouse);
+                priv->hw_init = alps_hw_init_v4;
+                priv->process_packet = alps_process_packet_v4;
+                priv->set_abs_params = alps_set_abs_params_mt;
                 break;
         }
-
-        return ret;
 }
 
 static int alps_match_table(struct psmouse *psmouse, struct alps_data *priv,
@@ -1465,6 +1454,8 @@ static int alps_match_table(struct psmouse *psmouse, struct alps_data *priv,
                      model->command_mode_resp == ec[2])) {
 
                         priv->proto_version = model->proto_version;
+                        alps_set_defaults(priv);
+
                         priv->flags = model->flags;
                         priv->byte0 = model->byte0;
                         priv->mask0 = model->mask0;
@@ -1523,7 +1514,7 @@ static int alps_reconnect(struct psmouse *psmouse)
         if (alps_identify(psmouse, priv) < 0)
                 return -1;
 
-        return alps_hw_init(psmouse);
+        return priv->hw_init(psmouse);
 }
 
 static void alps_disconnect(struct psmouse *psmouse)
@@ -1536,6 +1527,29 @@ static void alps_disconnect(struct psmouse *psmouse)
         kfree(priv);
 }
 
+static void alps_set_abs_params_st(struct alps_data *priv,
+                                   struct input_dev *dev1)
+{
+        input_set_abs_params(dev1, ABS_X, 0, 1023, 0, 0);
+        input_set_abs_params(dev1, ABS_Y, 0, 767, 0, 0);
+}
+
+static void alps_set_abs_params_mt(struct alps_data *priv,
+                                   struct input_dev *dev1)
+{
+        set_bit(INPUT_PROP_SEMI_MT, dev1->propbit);
+        input_mt_init_slots(dev1, 2, 0);
+        input_set_abs_params(dev1, ABS_MT_POSITION_X, 0, ALPS_V3_X_MAX, 0, 0);
+        input_set_abs_params(dev1, ABS_MT_POSITION_Y, 0, ALPS_V3_Y_MAX, 0, 0);
+
+        set_bit(BTN_TOOL_DOUBLETAP, dev1->keybit);
+        set_bit(BTN_TOOL_TRIPLETAP, dev1->keybit);
+        set_bit(BTN_TOOL_QUADTAP, dev1->keybit);
+
+        input_set_abs_params(dev1, ABS_X, 0, ALPS_V3_X_MAX, 0, 0);
+        input_set_abs_params(dev1, ABS_Y, 0, ALPS_V3_Y_MAX, 0, 0);
+}
+
 int alps_init(struct psmouse *psmouse)
 {
         struct alps_data *priv;
@@ -1556,7 +1570,7 @@ int alps_init(struct psmouse *psmouse)
         if (alps_identify(psmouse, priv) < 0)
                 goto init_fail;
 
-        if (alps_hw_init(psmouse))
+        if (priv->hw_init(psmouse))
                 goto init_fail;
 
         /*
@@ -1578,28 +1592,7 @@ int alps_init(struct psmouse *psmouse)
 
         dev1->evbit[BIT_WORD(EV_ABS)] |= BIT_MASK(EV_ABS);
 
-        switch (priv->proto_version) {
-        case ALPS_PROTO_V1:
-        case ALPS_PROTO_V2:
-                input_set_abs_params(dev1, ABS_X, 0, 1023, 0, 0);
-                input_set_abs_params(dev1, ABS_Y, 0, 767, 0, 0);
-                break;
-        case ALPS_PROTO_V3:
-        case ALPS_PROTO_V4:
-                set_bit(INPUT_PROP_SEMI_MT, dev1->propbit);
-                input_mt_init_slots(dev1, 2, 0);
-                input_set_abs_params(dev1, ABS_MT_POSITION_X, 0, ALPS_V3_X_MAX, 0, 0);
-                input_set_abs_params(dev1, ABS_MT_POSITION_Y, 0, ALPS_V3_Y_MAX, 0, 0);
-
-                set_bit(BTN_TOOL_DOUBLETAP, dev1->keybit);
-                set_bit(BTN_TOOL_TRIPLETAP, dev1->keybit);
-                set_bit(BTN_TOOL_QUADTAP, dev1->keybit);
-
-                input_set_abs_params(dev1, ABS_X, 0, ALPS_V3_X_MAX, 0, 0);
-                input_set_abs_params(dev1, ABS_Y, 0, ALPS_V3_Y_MAX, 0, 0);
-                break;
-        }
-
+        priv->set_abs_params(priv, dev1);
         input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
 
         if (priv->flags & ALPS_WHEEL) {
diff --git a/drivers/input/mouse/alps.h b/drivers/input/mouse/alps.h
index a81b31830454..0934f8bf7d76 100644
--- a/drivers/input/mouse/alps.h
+++ b/drivers/input/mouse/alps.h
@@ -72,6 +72,9 @@ struct alps_nibble_commands {
  *   mask0, should match byte0.
  * @mask0: The mask used to check the first byte of the report.
  * @flags: Additional device capabilities (passthrough port, trackstick, etc.).
+ * @hw_init: Protocol-specific hardware init function.
+ * @process_packet: Protocol-specific function to process a report packet.
+ * @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.
  * @multi_data: Saved multi-packet data.
@@ -94,6 +97,10 @@ struct alps_data {
         unsigned char byte0, mask0;
         unsigned char flags;
 
+        int (*hw_init)(struct psmouse *psmouse);
+        void (*process_packet)(struct psmouse *psmouse);
+        void (*set_abs_params)(struct alps_data *priv, struct input_dev *dev1);
+
         int prev_fin;
         int multi_packet;
         unsigned char multi_data[6];