Commit 3eb1aa43 authored by Jaya Kumar's avatar Jaya Kumar Committed by Dmitry Torokhov
Browse files

Input: add support for Wacom W8001 penabled serial touchscreen 



The Wacom W8001 sensor is a sensor device (uses electromagnetic
resonance) and it is interfaced via its serial microcontroller
to the host.

Signed-off-by: default avatarJaya Kumar <jayakumar.lkml@gmail.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent e42b6646

drivers/input/touchscreen/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -95,6 +95,19 @@ config TOUCHSCREEN_ELO 
	  To compile this driver as a module, choose M here: the

	  module will be called elo.



config TOUCHSCREEN_WACOM_W8001

	tristate "Wacom W8001 penabled serial touchscreen"

	select SERIO

	help

	  Say Y here if you have an Wacom W8001 penabled serial touchscreen

	  connected to your system.



	  If unsure, say N.



	  To compile this driver as a module, choose M here: the

	  module will be called wacom_w8001.





config TOUCHSCREEN_MTOUCH

	tristate "MicroTouch serial touchscreens"

	select SERIO

drivers/input/touchscreen/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o 
obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT)	+= touchright.o

obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN)	+= touchwin.o

obj-$(CONFIG_TOUCHSCREEN_UCB1400)	+= ucb1400_ts.o

obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001)	+= wacom_w8001.o

obj-$(CONFIG_TOUCHSCREEN_WM97XX)	+= wm97xx-ts.o

wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705)	+= wm9705.o

wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712)	+= wm9712.o

drivers/input/touchscreen/wacom_w8001.c

0 → 100644
+325 −0
Original line number Diff line number Diff line 
/*

 * Wacom W8001 penabled serial touchscreen driver

 *

 * Copyright (c) 2008 Jaya Kumar

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License. See the file COPYING in the main directory of this archive for

 * more details.

 *

 * Layout based on Elo serial touchscreen driver by Vojtech Pavlik

 */



#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/input.h>

#include <linux/serio.h>

#include <linux/init.h>

#include <linux/ctype.h>



#define DRIVER_DESC	"Wacom W8001 serial touchscreen driver"



MODULE_AUTHOR("Jaya Kumar <jayakumar.lkml@gmail.com>");

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");



/*

 * Definitions & global arrays.

 */



#define W8001_MAX_LENGTH	11

#define W8001_PACKET_LEN	11

#define W8001_LEAD_MASK 0x80

#define W8001_LEAD_BYTE 0x80

#define W8001_TAB_MASK 0x40

#define W8001_TAB_BYTE 0x40



#define W8001_QUERY_PACKET 0x20



struct w8001_coord {

	u8 rdy;

	u8 tsw;

	u8 f1;

	u8 f2;

	u16 x;

	u16 y;

	u16 pen_pressure;

	u8 tilt_x;

	u8 tilt_y;

};



/*

 * Per-touchscreen data.

 */



struct w8001 {

	struct input_dev *dev;

	struct serio *serio;

	struct mutex cmd_mutex;

	struct completion cmd_done;

	int id;

	int idx;

	unsigned char expected_packet;

	unsigned char data[W8001_MAX_LENGTH];

	unsigned char response[W8001_PACKET_LEN];

	char phys[32];

};



static int parse_data(u8 *data, struct w8001_coord *coord)

{

	coord->rdy = data[0] & 0x20;

	coord->tsw = data[0] & 0x01;

	coord->f1 = data[0] & 0x02;

	coord->f2 = data[0] & 0x04;



	coord->x = (data[1] & 0x7F) << 9;

	coord->x |= (data[2] & 0x7F) << 2;

	coord->x |= (data[6] & 0x60) >> 5;



	coord->y = (data[3] & 0x7F) << 9;

	coord->y |= (data[4] & 0x7F) << 2;

	coord->y |= (data[6] & 0x18) >> 3;



	coord->pen_pressure = data[5] & 0x7F;

	coord->pen_pressure |= (data[6] & 0x07) << 7 ;



	coord->tilt_x = data[7] & 0x7F;

	coord->tilt_y = data[8] & 0x7F;



	return 0;

}



static void w8001_process_data(struct w8001 *w8001, unsigned char data)

{

	struct input_dev *dev = w8001->dev;

	u8 tmp;

	struct w8001_coord coord;



	w8001->data[w8001->idx] = data;

	switch (w8001->idx++) {

	case 0:

		if ((data & W8001_LEAD_MASK) != W8001_LEAD_BYTE) {

			pr_debug("w8001: unsynchronized data: 0x%02x\n", data);

			w8001->idx = 0;

		}

		break;

	case 8:

		tmp = w8001->data[0] & W8001_TAB_MASK;

		if (unlikely(tmp == W8001_TAB_BYTE))

			break;

		w8001->idx = 0;

		memset(&coord, 0, sizeof(coord));

		parse_data(w8001->data, &coord);

		input_report_abs(dev, ABS_X, coord.x);

		input_report_abs(dev, ABS_Y, coord.y);

		input_report_abs(dev, ABS_PRESSURE, coord.pen_pressure);

		input_report_key(dev, BTN_TOUCH, coord.tsw);

		input_sync(dev);

		break;

	case 10:

		w8001->idx = 0;

		memcpy(w8001->response, &w8001->data, W8001_PACKET_LEN);

		w8001->expected_packet = W8001_QUERY_PACKET;

		complete(&w8001->cmd_done);

		break;

	}

}





static irqreturn_t w8001_interrupt(struct serio *serio,

		unsigned char data, unsigned int flags)

{

	struct w8001 *w8001 = serio_get_drvdata(serio);



	w8001_process_data(w8001, data);



	return IRQ_HANDLED;

}



static int w8001_async_command(struct w8001 *w8001, unsigned char *packet,

					int len)

{

	int rc = -1;

	int i;



	mutex_lock(&w8001->cmd_mutex);



	for (i = 0; i < len; i++) {

		if (serio_write(w8001->serio, packet[i]))

			goto out;

	}

	rc = 0;



out:

	mutex_unlock(&w8001->cmd_mutex);

	return rc;

}



static int w8001_command(struct w8001 *w8001, unsigned char *packet, int len)

{

	int rc = -1;

	int i;



	mutex_lock(&w8001->cmd_mutex);



	serio_pause_rx(w8001->serio);

	init_completion(&w8001->cmd_done);

	serio_continue_rx(w8001->serio);



	for (i = 0; i < len; i++) {

		if (serio_write(w8001->serio, packet[i]))

			goto out;

	}



	wait_for_completion_timeout(&w8001->cmd_done, HZ);



	if (w8001->expected_packet == W8001_QUERY_PACKET) {

		/* We are back in reporting mode, the query was ACKed */

		memcpy(packet, w8001->response, W8001_PACKET_LEN);

		rc = 0;

	}



out:

	mutex_unlock(&w8001->cmd_mutex);

	return rc;

}



static int w8001_setup(struct w8001 *w8001)

{

	struct w8001_coord coord;

	struct input_dev *dev = w8001->dev;

	unsigned char start[1] = { '1' };

	unsigned char query[11] = { '*' };



	if (w8001_command(w8001, query, 1))

		return -1;



	memset(&coord, 0, sizeof(coord));

	parse_data(query, &coord);



	input_set_abs_params(dev, ABS_X, 0, coord.x, 0, 0);

	input_set_abs_params(dev, ABS_Y, 0, coord.y, 0, 0);

	input_set_abs_params(dev, ABS_PRESSURE, 0, coord.pen_pressure, 0, 0);

	input_set_abs_params(dev, ABS_TILT_X, 0, coord.tilt_x, 0, 0);

	input_set_abs_params(dev, ABS_TILT_Y, 0, coord.tilt_y, 0, 0);



	if (w8001_async_command(w8001, start, 1))

		return -1;



	return 0;

}



/*

 * w8001_disconnect() is the opposite of w8001_connect()

 */



static void w8001_disconnect(struct serio *serio)

{

	struct w8001 *w8001 = serio_get_drvdata(serio);



	input_get_device(w8001->dev);

	input_unregister_device(w8001->dev);

	serio_close(serio);

	serio_set_drvdata(serio, NULL);

	input_put_device(w8001->dev);

	kfree(w8001);

}



/*

 * w8001_connect() is the routine that is called when someone adds a

 * new serio device that supports the w8001 protocol and registers it as

 * an input device.

 */



static int w8001_connect(struct serio *serio, struct serio_driver *drv)

{

	struct w8001 *w8001;

	struct input_dev *input_dev;

	int err;



	w8001 = kzalloc(sizeof(struct w8001), GFP_KERNEL);

	input_dev = input_allocate_device();

	if (!w8001 || !input_dev) {

		err = -ENOMEM;

		goto fail1;

	}



	w8001->serio = serio;

	w8001->id = serio->id.id;

	w8001->dev = input_dev;

	mutex_init(&w8001->cmd_mutex);

	init_completion(&w8001->cmd_done);

	snprintf(w8001->phys, sizeof(w8001->phys), "%s/input0", serio->phys);



	input_dev->name = "Wacom W8001 Penabled Serial TouchScreen";

	input_dev->phys = w8001->phys;

	input_dev->id.bustype = BUS_RS232;

	input_dev->id.vendor = SERIO_W8001;

	input_dev->id.product = w8001->id;

	input_dev->id.version = 0x0100;

	input_dev->dev.parent = &serio->dev;



	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);



	serio_set_drvdata(serio, w8001);

	err = serio_open(serio, drv);

	if (err)

		goto fail2;



	if (w8001_setup(w8001))

		goto fail3;



	err = input_register_device(w8001->dev);

	if (err)

		goto fail3;



	return 0;



fail3:

	serio_close(serio);

fail2:

	serio_set_drvdata(serio, NULL);

fail1:

	input_free_device(input_dev);

	kfree(w8001);

	return err;

}



static struct serio_device_id w8001_serio_ids[] = {

	{

		.type	= SERIO_RS232,

		.proto	= SERIO_W8001,

		.id	= SERIO_ANY,

		.extra	= SERIO_ANY,

	},

	{ 0 }

};



MODULE_DEVICE_TABLE(serio, w8001_serio_ids);



static struct serio_driver w8001_drv = {

	.driver		= {

		.name	= "w8001",

	},

	.description	= DRIVER_DESC,

	.id_table	= w8001_serio_ids,

	.interrupt	= w8001_interrupt,

	.connect	= w8001_connect,

	.disconnect	= w8001_disconnect,

};



static int __init w8001_init(void)

{

	return serio_register_driver(&w8001_drv);

}



static void __exit w8001_exit(void)

{

	serio_unregister_driver(&w8001_drv);

}



module_init(w8001_init);

module_exit(w8001_exit);

include/linux/serio.h

+1 −0
Original line number Diff line number Diff line
@@ -213,5 +213,6 @@ static inline void serio_unpin_driver(struct serio *serio) 
#define SERIO_ZHENHUA	0x36

#define SERIO_INEXIO	0x37

#define SERIO_TOUCHIT213	0x37

#define SERIO_W8001	0x39



#endif

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