staging: ste_rmi4: Convert to Type-B support

Convert to MT-B because Synaptics touch devices are capable
of tracking identifiable fingers.

Signed-off-by: Alexandra Chin <alexandra.chin@tw.synaptics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 33 insertions, 43 deletions

diff --git a/drivers/staging/ste_rmi4/synaptics_i2c_rmi4.c b/drivers/staging/ste_rmi4/synaptics_i2c_rmi4.c
index 37d19c696ea9..c71366d3deec 100644
--- a/drivers/staging/ste_rmi4/synaptics_i2c_rmi4.c
+++ b/drivers/staging/ste_rmi4/synaptics_i2c_rmi4.c
@@ -31,6 +31,7 @@
 #include <linux/interrupt.h>
 #include <linux/regulator/consumer.h>
 #include <linux/module.h>
+#include <linux/input/mt.h>
 #include "synaptics_i2c_rmi4.h"
 
 /* TODO: for multiple device support will need a per-device mutex */
@@ -67,7 +68,6 @@
 #define PDT_START_SCAN_LOCATION (0x00E9)
 #define PDT_END_SCAN_LOCATION   (0x000A)
 #define PDT_ENTRY_SIZE          (0x0006)
-#define RMI4_NUMBER_OF_MAX_FINGERS              (8)
 #define SYNAPTICS_RMI4_TOUCHPAD_FUNC_NUM        (0x11)
 #define SYNAPTICS_RMI4_DEVICE_CONTROL_FUNC_NUM  (0x01)
 
@@ -164,6 +164,7 @@ struct synaptics_rmi4_device_info {
  * @regulator: pointer to the regulator structure
  * @wait: wait queue structure variable
  * @touch_stopped: flag to stop the thread function
+ * @fingers_supported: maximum supported fingers
  *
  * This structure gives the device data information.
  */
@@ -184,6 +185,7 @@ struct synaptics_rmi4_data {
         struct regulator        *regulator;
         wait_queue_head_t       wait;
         bool                    touch_stopped;
+        unsigned char           fingers_supported;
 };
 
 /**
@@ -303,22 +305,21 @@ static int synpatics_rmi4_touchpad_report(struct synaptics_rmi4_data *pdata,
         /* number of touch points - fingers down in this case */
         int     touch_count = 0;
         int     finger;
-        int     fingers_supported;
         int     finger_registers;
         int     reg;
         int     finger_shift;
         int     finger_status;
         int     retval;
+        int     x, y;
+        int     wx, wy;
         unsigned short  data_base_addr;
         unsigned short  data_offset;
         unsigned char   data_reg_blk_size;
         unsigned char   values[2];
         unsigned char   data[DATA_LEN];
-        int     x[RMI4_NUMBER_OF_MAX_FINGERS];
-        int     y[RMI4_NUMBER_OF_MAX_FINGERS];
-        int     wx[RMI4_NUMBER_OF_MAX_FINGERS];
-        int     wy[RMI4_NUMBER_OF_MAX_FINGERS];
+        unsigned char   fingers_supported = pdata->fingers_supported;
         struct  i2c_client *client = pdata->i2c_client;
+        struct  input_dev *input_dev = pdata->input_dev;
 
         /* get 2D sensor finger data */
         /*
@@ -333,7 +334,6 @@ static int synpatics_rmi4_touchpad_report(struct synaptics_rmi4_data *pdata,
          *      10 = finger present but data may not be accurate,
          *      11 = reserved for product use.
          */
-        fingers_supported       = rfi->num_of_data_points;
         finger_registers        = (fingers_supported + 3)/4;
         data_base_addr          = rfi->fn_desc.data_base_addr;
         retval = synaptics_rmi4_i2c_block_read(pdata, data_base_addr, values,
@@ -358,7 +358,11 @@ static int synpatics_rmi4_touchpad_report(struct synaptics_rmi4_data *pdata,
                  * if finger status indicates a finger is present then
                  * read the finger data and report it
                  */
-                if (finger_status == 1 || finger_status == 2) {
+                input_mt_slot(input_dev, finger);
+                input_mt_report_slot_state(input_dev, MT_TOOL_FINGER,
+                                                        finger_status != 0);
+
+                if (finger_status) {
                         /* Read the finger data */
                         data_offset = data_base_addr +
                                         ((finger * data_reg_blk_size) +
@@ -367,50 +371,33 @@ static int synpatics_rmi4_touchpad_report(struct synaptics_rmi4_data *pdata,
                                                 data_offset, data,
                                                 data_reg_blk_size);
                         if (retval != data_reg_blk_size) {
-                                printk(KERN_ERR "%s:read data failed\n",
+                                dev_err(&client->dev, "%s:read data failed\n",
                                                                 __func__);
                                 return 0;
-                        } else {
-                                x[touch_count]  =
-                                        (data[0] << 4) | (data[2] & MASK_4BIT);
-                                y[touch_count]  =
-                                        (data[1] << 4) |
-                                        ((data[2] >> 4) & MASK_4BIT);
-                                wy[touch_count] =
-                                                (data[3] >> 4) & MASK_4BIT;
-                                wx[touch_count] =
-                                                (data[3] & MASK_4BIT);
-
-                                if (pdata->board->x_flip)
-                                        x[touch_count] =
-                                                pdata->sensor_max_x -
-                                                                x[touch_count];
-                                if (pdata->board->y_flip)
-                                        y[touch_count] =
-                                                pdata->sensor_max_y -
-                                                                y[touch_count];
                         }
+                        x = (data[0] << 4) | (data[2] & MASK_4BIT);
+                        y = (data[1] << 4) | ((data[2] >> 4) & MASK_4BIT);
+                        wy = (data[3] >> 4) & MASK_4BIT;
+                        wx = (data[3] & MASK_4BIT);
+
+                        if (pdata->board->x_flip)
+                                x = pdata->sensor_max_x - x;
+                        if (pdata->board->y_flip)
+                                y = pdata->sensor_max_y - y;
+
+                        input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR,
+                                                                max(wx, wy));
+                        input_report_abs(input_dev, ABS_MT_POSITION_X, x);
+                        input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
+
                         /* number of active touch points */
                         touch_count++;
                 }
         }
 
-        /* report to input subsystem */
-        if (touch_count) {
-                for (finger = 0; finger < touch_count; finger++) {
-                        input_report_abs(pdata->input_dev, ABS_MT_TOUCH_MAJOR,
-                                                max(wx[finger] , wy[finger]));
-                        input_report_abs(pdata->input_dev, ABS_MT_POSITION_X,
-                                                                x[finger]);
-                        input_report_abs(pdata->input_dev, ABS_MT_POSITION_Y,
-                                                                y[finger]);
-                        input_mt_sync(pdata->input_dev);
-                }
-        } else
-                input_mt_sync(pdata->input_dev);
-
         /* sync after groups of events */
-        input_sync(pdata->input_dev);
+        input_mt_sync_frame(input_dev);
+        input_sync(input_dev);
         /* return the number of touch points */
         return touch_count;
 }
@@ -575,6 +562,7 @@ static int synpatics_rmi4_touchpad_detect(struct synaptics_rmi4_data *pdata,
                 if ((queries[1] & MASK_3BIT) == 5)
                         rfi->num_of_data_points = 10;
         }
+        pdata->fingers_supported = rfi->num_of_data_points;
         /* Need to get interrupt info for handling interrupts */
         rfi->index_to_intr_reg = (interruptcount + 7)/8;
         if (rfi->index_to_intr_reg != 0)
@@ -988,6 +976,8 @@ static int __devinit synaptics_rmi4_probe
                                         rmi4_data->sensor_max_y, 0, 0);
         input_set_abs_params(rmi4_data->input_dev, ABS_MT_TOUCH_MAJOR, 0,
                                                 MAX_TOUCH_MAJOR, 0, 0);
+        input_mt_init_slots(rmi4_data->input_dev,
+                                rmi4_data->fingers_supported, 0);
 
         /* Clear interrupts */
         synaptics_rmi4_i2c_block_read(rmi4_data,