Input: atmel_mxt_ts - support 12bit resolution

Atmel touchscreen chip can support 12bit resolution and this patch
modifies to get maximum x and y size from platform data.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Acked-by: Iiro Valkonen <iiro.valkonen@atmel.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 39 insertions, 14 deletions

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 4012436633b..a97905a17b7 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -196,9 +196,12 @@
 #define MXT_PRESS               (1 << 6)
 #define MXT_DETECT              (1 << 7)
 
+/* Touch orient bits */
+#define MXT_XY_SWITCH           (1 << 0)
+#define MXT_X_INVERT            (1 << 1)
+#define MXT_Y_INVERT            (1 << 2)
+
 /* Touchscreen absolute values */
-#define MXT_MAX_XC              0x3ff
-#define MXT_MAX_YC              0x3ff
 #define MXT_MAX_AREA            0xff
 
 #define MXT_MAX_FINGER          10
@@ -246,6 +249,8 @@ struct mxt_data {
         struct mxt_info info;
         struct mxt_finger finger[MXT_MAX_FINGER];
         unsigned int irq;
+        unsigned int max_x;
+        unsigned int max_y;
 };
 
 static bool mxt_object_readable(unsigned int type)
@@ -549,8 +554,13 @@ static void mxt_input_touchevent(struct mxt_data *data,
         if (!(status & (MXT_PRESS | MXT_MOVE)))
                 return;
 
-        x = (message->message[1] << 2) | ((message->message[3] & ~0x3f) >> 6);
-        y = (message->message[2] << 2) | ((message->message[3] & ~0xf3) >> 2);
+        x = (message->message[1] << 4) | ((message->message[3] >> 4) & 0xf);
+        y = (message->message[2] << 4) | ((message->message[3] & 0xf));
+        if (data->max_x < 1024)
+                x = x >> 2;
+        if (data->max_y < 1024)
+                y = y >> 2;
+
         area = message->message[4];
 
         dev_dbg(dev, "[%d] %s x: %d, y: %d, area: %d\n", id,
@@ -845,6 +855,20 @@ static int mxt_initialize(struct mxt_data *data)
         return 0;
 }
 
+static void mxt_calc_resolution(struct mxt_data *data)
+{
+        unsigned int max_x = data->pdata->x_size - 1;
+        unsigned int max_y = data->pdata->y_size - 1;
+
+        if (data->pdata->orient & MXT_XY_SWITCH) {
+                data->max_x = max_y;
+                data->max_y = max_x;
+        } else {
+                data->max_x = max_x;
+                data->max_y = max_y;
+        }
+}
+
 static ssize_t mxt_object_show(struct device *dev,
                                     struct device_attribute *attr, char *buf)
 {
@@ -1052,31 +1076,32 @@ static int __devinit mxt_probe(struct i2c_client *client,
         input_dev->open = mxt_input_open;
         input_dev->close = mxt_input_close;
 
+        data->client = client;
+        data->input_dev = input_dev;
+        data->pdata = pdata;
+        data->irq = client->irq;
+
+        mxt_calc_resolution(data);
+
         __set_bit(EV_ABS, input_dev->evbit);
         __set_bit(EV_KEY, input_dev->evbit);
         __set_bit(BTN_TOUCH, input_dev->keybit);
 
         /* For single touch */
         input_set_abs_params(input_dev, ABS_X,
-                             0, MXT_MAX_XC, 0, 0);
+                             0, data->max_x, 0, 0);
         input_set_abs_params(input_dev, ABS_Y,
-                             0, MXT_MAX_YC, 0, 0);
+                             0, data->max_y, 0, 0);
 
         /* For multi touch */
         input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
                              0, MXT_MAX_AREA, 0, 0);
         input_set_abs_params(input_dev, ABS_MT_POSITION_X,
-                             0, MXT_MAX_XC, 0, 0);
+                             0, data->max_x, 0, 0);
         input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
-                             0, MXT_MAX_YC, 0, 0);
+                             0, data->max_y, 0, 0);
 
         input_set_drvdata(input_dev, data);
-
-        data->client = client;
-        data->input_dev = input_dev;
-        data->pdata = pdata;
-        data->irq = client->irq;
-
         i2c_set_clientdata(client, data);
 
         error = mxt_initialize(data);