Input: melfas_mip4 - add resolution reporting

Add support for retrieving device resolution (pixels per mm) from firmware
and using it when setting up input device.
Signed-off-by: Sangwon Jee <jeesw@melfas.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/melfas_mip4.c

@@ -33,7 +33,7 @@
 
 /*****************************************************************
  * Protocol
- * Version : MIP 4.0 Rev 4.4
+ * Version : MIP 4.0 Rev 4.6
  *****************************************************************/
 
 /* Address */
@@ -52,6 +52,11 @@
 #define MIP4_R1_INFO_NODE_NUM_X			0x14
 #define MIP4_R1_INFO_NODE_NUM_Y			0x15
 #define MIP4_R1_INFO_KEY_NUM			0x16
+#define MIP4_R1_INFO_PRESSURE_NUM		0x17
+#define MIP4_R1_INFO_LENGTH_X			0x18
+#define MIP4_R1_INFO_LENGTH_Y			0x1A
+#define MIP4_R1_INFO_PPM_X			0x1C
+#define MIP4_R1_INFO_PPM_Y			0x1D
 #define MIP4_R1_INFO_VERSION_BOOT		0x20
 #define MIP4_R1_INFO_VERSION_CORE		0x22
 #define MIP4_R1_INFO_VERSION_APP		0x24
@@ -158,6 +163,8 @@ struct mip4_ts {
 	u8 node_x;
 	u8 node_y;
 	u8 node_key;
+	unsigned int ppm_x;
+	unsigned int ppm_y;
 
 	struct mip4_fw_version fw_version;
 
@@ -242,7 +249,7 @@ static int mip4_query_device(struct mip4_ts *ts)
 {
 	int error;
 	u8 cmd[2];
-	u8 buf[8];
+	u8 buf[14];
 
 	/* Product name */
 	cmd[0] = MIP4_R0_INFO;
@@ -269,7 +276,7 @@ static int mip4_query_device(struct mip4_ts *ts)
 	/* Resolution */
 	cmd[0] = MIP4_R0_INFO;
 	cmd[1] = MIP4_R1_INFO_RESOLUTION_X;
-	error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 7);
+	error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 14);
 	if (error) {
 		dev_warn(&ts->client->dev,
 			 "Failed to retrieve touchscreen parameters: %d\n",
@@ -287,6 +294,11 @@ static int mip4_query_device(struct mip4_ts *ts)
 			"node_x: %d, node_y: %d, node_key: %d\n",
 			ts->node_x, ts->node_y, ts->node_key);
 
+		ts->ppm_x = buf[12];
+		ts->ppm_y = buf[13];
+		dev_dbg(&ts->client->dev, "ppm_x: %d, ppm_y: %d\n",
+			ts->ppm_x, ts->ppm_y);
+
 		/* Key ts */
 		if (ts->node_key > 0)
 			ts->key_num = ts->node_key;
@@ -1095,6 +1107,10 @@ static int mip4_flash_fw(struct mip4_ts *ts,
 	input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0);
 	input_set_abs_params(ts->input, ABS_X, 0, ts->max_x, 0, 0);
 	input_set_abs_params(ts->input, ABS_Y, 0, ts->max_y, 0, 0);
+	input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->ppm_x);
+	input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->ppm_y);
+	input_abs_set_res(ts->input, ABS_X, ts->ppm_x);
+	input_abs_set_res(ts->input, ABS_Y, ts->ppm_y);
 
 	return error ? error : 0;
 }
@@ -1377,6 +1393,8 @@ static int mip4_probe(struct i2c_client *client, const struct i2c_device_id *id)
 			     MIP4_TOUCH_MAJOR_MIN, MIP4_TOUCH_MAJOR_MAX, 0, 0);
 	input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
 			     MIP4_TOUCH_MINOR_MIN, MIP4_TOUCH_MINOR_MAX, 0, 0);
+	input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->ppm_x);
+	input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->ppm_y);
 
 	error = input_mt_init_slots(input, MIP4_MAX_FINGERS, INPUT_MT_DIRECT);
 	if (error)
@@ -1494,6 +1512,6 @@ static struct i2c_driver mip4_driver = {
 module_i2c_driver(mip4_driver);
 
 MODULE_DESCRIPTION("MELFAS MIP4 Touchscreen");
-MODULE_VERSION("2016.01.13");
+MODULE_VERSION("2016.03.03");
 MODULE_AUTHOR("Sangwon Jee <jeesw@melfas.com>");
 MODULE_LICENSE("GPL");