linux-kernel - [PATCH v9] psmouse - focaltech pass finger width to userspace

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Date:	Fri, 24 Apr 2015 15:00:03 +0300
From:	Dmitry Tunin <hanipouspilot@...il.com>
To:	linux-input@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, mgottschlag@...il.com,
	Dmitry Tunin <hanipouspilot@...il.com>
Subject: [PATCH v9] psmouse - focaltech pass 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@...il.com>
---
 drivers/input/mouse/focaltech.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/input/mouse/focaltech.c b/drivers/input/mouse/focaltech.c
index 23d2594..0c3b698 100644
--- a/drivers/input/mouse/focaltech.c
+++ b/drivers/input/mouse/focaltech.c
@@ -105,6 +105,16 @@ struct focaltech_hw_state {
 
 	/* True if the clickpad has been pressed. */
 	bool pressed;
+
+	/*
+	* 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;
 };
 
 struct focaltech_data {
@@ -112,7 +122,7 @@ struct focaltech_data {
 	struct focaltech_hw_state state;
 };
 
-static void focaltech_report_state(struct psmouse *psmouse)
+static void focaltech_report_state(struct psmouse *psmouse, bool abs)
 {
 	struct focaltech_data *priv = psmouse->private;
 	struct focaltech_hw_state *state = &priv->state;
@@ -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);
+			if (abs) 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;
 }
 
@@ -228,22 +240,23 @@ static void focaltech_process_packet(struct psmouse *psmouse)
 	switch (packet[0] & 0xf) {
 	case FOC_TOUCH:
 		focaltech_process_touch_packet(psmouse, packet);
+		focaltech_report_state(psmouse, false);
 		break;
 
 	case FOC_ABS:
 		focaltech_process_abs_packet(psmouse, packet);
+		focaltech_report_state(psmouse, true);
 		break;
 
 	case FOC_REL:
 		focaltech_process_rel_packet(psmouse, packet);
+		focaltech_report_state(psmouse, false);
 		break;
 
 	default:
 		psmouse_err(psmouse, "Unknown packet type: %02x\n", packet[0]);
 		break;
 	}
-
-	focaltech_report_state(psmouse);
 }
 
 static psmouse_ret_t focaltech_process_byte(struct psmouse *psmouse)
@@ -331,6 +344,7 @@ 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);
 }
-- 
1.9.1

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