Input: focaltech - report finger width to userspace

Focaltech touchpads report finger width in packet[5] of absolute packet.
Range for width in raw format is 0x10 - 0x70. Second half-byte is always 0.
0xff is reported, when a large contact area is detected.
This can be handled in userspace.

Signed-off-by: Dmitry Tunin <hanipouspilot@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/input/mouse/focaltech.c b/drivers/input/mouse/focaltech.c
index 23d259416f2f..4d5576de81be 100644
--- a/drivers/input/mouse/focaltech.c
+++ b/drivers/input/mouse/focaltech.c
@@ -103,6 +103,16 @@ struct focaltech_hw_state {
          */
         struct focaltech_finger_state fingers[FOC_MAX_FINGERS];
 
+        /*
+         * Finger width 0-7 and 15 for a very big contact area.
+         * 15 value stays until the finger is released.
+         * Width is reported only in absolute packets.
+         * Since hardware reports width only for last touching finger,
+         * there is no need to store width for every specific finger,
+         * so we keep only last value reported.
+         */
+        unsigned int width;
+
         /* True if the clickpad has been pressed. */
         bool pressed;
 };
@@ -137,6 +147,7 @@ static void focaltech_report_state(struct psmouse *psmouse)
                         input_report_abs(dev, ABS_MT_POSITION_X, clamped_x);
                         input_report_abs(dev, ABS_MT_POSITION_Y,
                                          priv->y_max - clamped_y);
+                        input_report_abs(dev, ABS_TOOL_WIDTH, state->width);
                 }
         }
         input_mt_report_pointer_emulation(dev, true);
@@ -187,6 +198,7 @@ static void focaltech_process_abs_packet(struct psmouse *psmouse,
 
         state->fingers[finger].x = ((packet[1] & 0xf) << 8) | packet[2];
         state->fingers[finger].y = (packet[3] << 8) | packet[4];
+        state->width = packet[5] >> 4;
         state->fingers[finger].valid = true;
 }
 
@@ -331,6 +343,7 @@ static void focaltech_set_input_params(struct psmouse *psmouse)
         __set_bit(EV_ABS, dev->evbit);
         input_set_abs_params(dev, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
         input_set_abs_params(dev, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
+        input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
         input_mt_init_slots(dev, 5, INPUT_MT_POINTER);
         __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
 }