linux/drivers/input/touchscreen/wacom_w8001.c - nest-guard/1.0/linux - Git at Google

 /*
  * Wacom W8001 penabled serial touchscreen driver
  *
  * Copyright (c) 2008 Jaya Kumar
  * Copyright (c) 2010 Red Hat, Inc.
  *
  * 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");

 #define W8001_MAX_LENGTH	11
 #define W8001_LEAD_MASK		0x80
 #define W8001_LEAD_BYTE		0x80
 #define W8001_TAB_MASK		0x40
 #define W8001_TAB_BYTE		0x40
 /* set in first byte of touch data packets */
 #define W8001_TOUCH_MASK	(0x10 | W8001_LEAD_MASK)
 #define W8001_TOUCH_BYTE	(0x10 | W8001_LEAD_BYTE)

 #define W8001_QUERY_PACKET	0x20

 #define W8001_CMD_START		'1'
 #define W8001_CMD_QUERY		'*'
 #define W8001_CMD_TOUCHQUERY	'%'

 /* length of data packets in bytes, depends on device. */
 #define W8001_PKTLEN_TOUCH93	5
 #define W8001_PKTLEN_TOUCH9A	7
 #define W8001_PKTLEN_TPCPEN	9
 #define W8001_PKTLEN_TPCCTL	11	/* control packet */
 #define W8001_PKTLEN_TOUCH2FG	13

 #define MAX_TRACKING_ID		0xFF	/* arbitrarily chosen */

 struct w8001_coord {
 	u8 rdy;
 	u8 tsw;
 	u8 f1;
 	u8 f2;
 	u16 x;
 	u16 y;
 	u16 pen_pressure;
 	u8 tilt_x;
 	u8 tilt_y;
 };

 /* touch query reply packet */
 struct w8001_touch_query {
 	u8 panel_res;
 	u8 capacity_res;
 	u8 sensor_id;
 	u16 x;
 	u16 y;
 };

 /*
  * Per-touchscreen data.
  */

 struct w8001 {
 	struct input_dev *dev;
 	struct serio *serio;
 	struct completion cmd_done;
 	int id;
 	int idx;
 	unsigned char response_type;
 	unsigned char response[W8001_MAX_LENGTH];
 	unsigned char data[W8001_MAX_LENGTH];
 	char phys[32];
 	int type;
 	unsigned int pktlen;
 	int trkid[2];
 };

 static void parse_data(u8 *data, struct w8001_coord *coord)
 {
 	memset(coord, 0, sizeof(*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;
 }

 static void parse_touch(struct w8001 *w8001)
 {
 	static int trkid;
 	struct input_dev *dev = w8001->dev;
 	unsigned char *data = w8001->data;
 	int i;

 	for (i = 0; i < 2; i++) {
 		input_mt_slot(dev, i);

 		if (data[0] & (1 << i)) {
 			int x = (data[6 * i + 1] << 7) | (data[6 * i + 2]);
 			int y = (data[6 * i + 3] << 7) | (data[6 * i + 4]);
 			/* data[5,6] and [11,12] is finger capacity */

 			input_report_abs(dev, ABS_MT_POSITION_X, x);
 			input_report_abs(dev, ABS_MT_POSITION_Y, y);
 			input_report_abs(dev, ABS_MT_TOOL_TYPE, MT_TOOL_FINGER);
 			if (w8001->trkid[i] < 0)
 				w8001->trkid[i] = trkid++ & MAX_TRACKING_ID;
 		} else {
 			w8001->trkid[i] = -1;
 		}
 		input_report_abs(dev, ABS_MT_TRACKING_ID, w8001->trkid[i]);
 	}

 	input_sync(dev);
 }

 static void parse_touchquery(u8 *data, struct w8001_touch_query *query)
 {
 	memset(query, 0, sizeof(*query));

 	query->panel_res = data[1];
 	query->sensor_id = data[2] & 0x7;
 	query->capacity_res = data[7];

 	query->x = data[3] << 9;
 	query->x |= data[4] << 2;
 	query->x |= (data[2] >> 5) & 0x3;

 	query->y = data[5] << 9;
 	query->y |= data[6] << 2;
 	query->y |= (data[2] >> 3) & 0x3;
 }

 static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
 {
 	struct input_dev *dev = w8001->dev;

 	/*
 	 * We have 1 bit for proximity (rdy) and 3 bits for tip, side,
 	 * side2/eraser. If rdy && f2 are set, this can be either pen + side2,
 	 * or eraser. assume
 	 * - if dev is already in proximity and f2 is toggled → pen + side2
 	 * - if dev comes into proximity with f2 set → eraser
 	 * If f2 disappears after assuming eraser, fake proximity out for
 	 * eraser and in for pen.
 	 */

 	if (!w8001->type) {
 		w8001->type = coord->f2 ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
 	} else if (w8001->type == BTN_TOOL_RUBBER) {
 		if (!coord->f2) {
 			input_report_abs(dev, ABS_PRESSURE, 0);
 			input_report_key(dev, BTN_TOUCH, 0);
 			input_report_key(dev, BTN_STYLUS, 0);
 			input_report_key(dev, BTN_STYLUS2, 0);
 			input_report_key(dev, BTN_TOOL_RUBBER, 0);
 			input_sync(dev);
 			w8001->type = BTN_TOOL_PEN;
 		}
 	} else {
 		input_report_key(dev, BTN_STYLUS2, coord->f2);
 	}

 	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_report_key(dev, BTN_STYLUS, coord->f1);
 	input_report_key(dev, w8001->type, coord->rdy);
 	input_sync(dev);

 	if (!coord->rdy)
 		w8001->type = 0;
 }

 static irqreturn_t w8001_interrupt(struct serio *serio,
 				   unsigned char data, unsigned int flags)
 {
 	struct w8001 *w8001 = serio_get_drvdata(serio);
 	struct w8001_coord coord;
 	unsigned char tmp;

 	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 W8001_PKTLEN_TOUCH93 - 1:
 	case W8001_PKTLEN_TOUCH9A - 1:
 		/* ignore one-finger touch packet. */
 		if (w8001->pktlen == w8001->idx)
 			w8001->idx = 0;
 		break;

 	/* Pen coordinates packet */
 	case W8001_PKTLEN_TPCPEN - 1:
 		tmp = w8001->data[0] & W8001_TAB_MASK;
 		if (unlikely(tmp == W8001_TAB_BYTE))
 			break;

 		tmp = (w8001->data[0] & W8001_TOUCH_BYTE);
 		if (tmp == W8001_TOUCH_BYTE)
 			break;

 		w8001->idx = 0;
 		parse_data(w8001->data, &coord);
 		report_pen_events(w8001, &coord);
 		break;

 	/* control packet */
 	case W8001_PKTLEN_TPCCTL - 1:
 		tmp = (w8001->data[0] & W8001_TOUCH_MASK);
 		if (tmp == W8001_TOUCH_BYTE)
 			break;

 		w8001->idx = 0;
 		memcpy(w8001->response, w8001->data, W8001_MAX_LENGTH);
 		w8001->response_type = W8001_QUERY_PACKET;
 		complete(&w8001->cmd_done);
 		break;

 	/* 2 finger touch packet */
 	case W8001_PKTLEN_TOUCH2FG - 1:
 		w8001->idx = 0;
 		parse_touch(w8001);
 		break;
 	}

 	return IRQ_HANDLED;
 }

 static int w8001_command(struct w8001 *w8001, unsigned char command,
 			 bool wait_response)
 {
 	int rc;

 	w8001->response_type = 0;
 	init_completion(&w8001->cmd_done);

 	rc = serio_write(w8001->serio, command);
 	if (rc == 0 && wait_response) {

 		wait_for_completion_timeout(&w8001->cmd_done, HZ);
 		if (w8001->response_type != W8001_QUERY_PACKET)
 			rc = -EIO;
 	}

 	return rc;
 }

 static int w8001_setup(struct w8001 *w8001)
 {
 	struct input_dev *dev = w8001->dev;
 	struct w8001_coord coord;
 	int error;

 	error = w8001_command(w8001, W8001_CMD_QUERY, true);
 	if (error)
 		return error;

 	parse_data(w8001->response, &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);

 	error = w8001_command(w8001, W8001_CMD_TOUCHQUERY, true);
 	if (!error) {
 		struct w8001_touch_query touch;

 		parse_touchquery(w8001->response, &touch);

 		switch (touch.sensor_id) {
 		case 0:
 		case 2:
 			w8001->pktlen = W8001_PKTLEN_TOUCH93;
 			break;
 		case 1:
 		case 3:
 		case 4:
 			w8001->pktlen = W8001_PKTLEN_TOUCH9A;
 			break;
 		case 5:
 			w8001->pktlen = W8001_PKTLEN_TOUCH2FG;

 			input_mt_create_slots(dev, 2);
 			input_set_abs_params(dev, ABS_MT_TRACKING_ID,
 						0, MAX_TRACKING_ID, 0, 0);
 			input_set_abs_params(dev, ABS_MT_POSITION_X,
 						0, touch.x, 0, 0);
 			input_set_abs_params(dev, ABS_MT_POSITION_Y,
 						0, touch.y, 0, 0);
 			input_set_abs_params(dev, ABS_MT_TOOL_TYPE,
 						0, 0, 0, 0);
 			break;
 		}
 	}

 	return w8001_command(w8001, W8001_CMD_START, false);
 }

 /*
  * 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;
 	w8001->trkid[0] = w8001->trkid[1] = -1;
 	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);
 	input_dev->keybit[BIT_WORD(BTN_TOOL_PEN)] |= BIT_MASK(BTN_TOOL_PEN);
 	input_dev->keybit[BIT_WORD(BTN_TOOL_RUBBER)] |= BIT_MASK(BTN_TOOL_RUBBER);
 	input_dev->keybit[BIT_WORD(BTN_STYLUS)] |= BIT_MASK(BTN_STYLUS);
 	input_dev->keybit[BIT_WORD(BTN_STYLUS2)] |= BIT_MASK(BTN_STYLUS2);

 	serio_set_drvdata(serio, w8001);
 	err = serio_open(serio, drv);
 	if (err)
 		goto fail2;

 	err = w8001_setup(w8001);
 	if (err)
 		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);
	/*
	* Wacom W8001 penabled serial touchscreen driver
	*
	* Copyright (c) 2008 Jaya Kumar
	* Copyright (c) 2010 Red Hat, Inc.
	*
	* 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");

	#define W8001_MAX_LENGTH 11
	#define W8001_LEAD_MASK 0x80
	#define W8001_LEAD_BYTE 0x80
	#define W8001_TAB_MASK 0x40
	#define W8001_TAB_BYTE 0x40
	/* set in first byte of touch data packets */
	#define W8001_TOUCH_MASK (0x10 \| W8001_LEAD_MASK)
	#define W8001_TOUCH_BYTE (0x10 \| W8001_LEAD_BYTE)

	#define W8001_QUERY_PACKET 0x20

	#define W8001_CMD_START '1'
	#define W8001_CMD_QUERY '*'
	#define W8001_CMD_TOUCHQUERY '%'

	/* length of data packets in bytes, depends on device. */
	#define W8001_PKTLEN_TOUCH93 5
	#define W8001_PKTLEN_TOUCH9A 7
	#define W8001_PKTLEN_TPCPEN 9
	#define W8001_PKTLEN_TPCCTL 11 /* control packet */
	#define W8001_PKTLEN_TOUCH2FG 13

	#define MAX_TRACKING_ID 0xFF /* arbitrarily chosen */

	struct w8001_coord {
	u8 rdy;
	u8 tsw;
	u8 f1;
	u8 f2;
	u16 x;
	u16 y;
	u16 pen_pressure;
	u8 tilt_x;
	u8 tilt_y;
	};

	/* touch query reply packet */
	struct w8001_touch_query {
	u8 panel_res;
	u8 capacity_res;
	u8 sensor_id;
	u16 x;
	u16 y;
	};

	/*
	* Per-touchscreen data.
	*/

	struct w8001 {
	struct input_dev *dev;
	struct serio *serio;
	struct completion cmd_done;
	int id;
	int idx;
	unsigned char response_type;
	unsigned char response[W8001_MAX_LENGTH];
	unsigned char data[W8001_MAX_LENGTH];
	char phys[32];
	int type;
	unsigned int pktlen;
	int trkid[2];
	};

	static void parse_data(u8 data, struct w8001_coord coord)
	{
	memset(coord, 0, sizeof(*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;
	}

	static void parse_touch(struct w8001 *w8001)
	{
	static int trkid;
	struct input_dev *dev = w8001->dev;
	unsigned char *data = w8001->data;
	int i;

	for (i = 0; i < 2; i++) {
	input_mt_slot(dev, i);

	if (data[0] & (1 << i)) {
	int x = (data[6 * i + 1] << 7) \| (data[6 * i + 2]);
	int y = (data[6 * i + 3] << 7) \| (data[6 * i + 4]);
	/* data[5,6] and [11,12] is finger capacity */

	input_report_abs(dev, ABS_MT_POSITION_X, x);
	input_report_abs(dev, ABS_MT_POSITION_Y, y);
	input_report_abs(dev, ABS_MT_TOOL_TYPE, MT_TOOL_FINGER);
	if (w8001->trkid[i] < 0)
	w8001->trkid[i] = trkid++ & MAX_TRACKING_ID;
	} else {
	w8001->trkid[i] = -1;
	}
	input_report_abs(dev, ABS_MT_TRACKING_ID, w8001->trkid[i]);
	}

	input_sync(dev);
	}

	static void parse_touchquery(u8 data, struct w8001_touch_query query)
	{
	memset(query, 0, sizeof(*query));

	query->panel_res = data[1];
	query->sensor_id = data[2] & 0x7;
	query->capacity_res = data[7];

	query->x = data[3] << 9;
	query->x \|= data[4] << 2;
	query->x \|= (data[2] >> 5) & 0x3;

	query->y = data[5] << 9;
	query->y \|= data[6] << 2;
	query->y \|= (data[2] >> 3) & 0x3;
	}

	static void report_pen_events(struct w8001 w8001, struct w8001_coord coord)
	{
	struct input_dev *dev = w8001->dev;

	/*
	* We have 1 bit for proximity (rdy) and 3 bits for tip, side,
	* side2/eraser. If rdy && f2 are set, this can be either pen + side2,
	* or eraser. assume
	* - if dev is already in proximity and f2 is toggled → pen + side2
	* - if dev comes into proximity with f2 set → eraser
	* If f2 disappears after assuming eraser, fake proximity out for
	* eraser and in for pen.
	*/

	if (!w8001->type) {
	w8001->type = coord->f2 ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
	} else if (w8001->type == BTN_TOOL_RUBBER) {
	if (!coord->f2) {
	input_report_abs(dev, ABS_PRESSURE, 0);
	input_report_key(dev, BTN_TOUCH, 0);
	input_report_key(dev, BTN_STYLUS, 0);
	input_report_key(dev, BTN_STYLUS2, 0);
	input_report_key(dev, BTN_TOOL_RUBBER, 0);
	input_sync(dev);
	w8001->type = BTN_TOOL_PEN;
	}
	} else {
	input_report_key(dev, BTN_STYLUS2, coord->f2);
	}

	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_report_key(dev, BTN_STYLUS, coord->f1);
	input_report_key(dev, w8001->type, coord->rdy);
	input_sync(dev);

	if (!coord->rdy)
	w8001->type = 0;
	}

	static irqreturn_t w8001_interrupt(struct serio *serio,
	unsigned char data, unsigned int flags)
	{
	struct w8001 *w8001 = serio_get_drvdata(serio);
	struct w8001_coord coord;
	unsigned char tmp;

	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 W8001_PKTLEN_TOUCH93 - 1:
	case W8001_PKTLEN_TOUCH9A - 1:
	/* ignore one-finger touch packet. */
	if (w8001->pktlen == w8001->idx)
	w8001->idx = 0;
	break;

	/* Pen coordinates packet */
	case W8001_PKTLEN_TPCPEN - 1:
	tmp = w8001->data[0] & W8001_TAB_MASK;
	if (unlikely(tmp == W8001_TAB_BYTE))
	break;

	tmp = (w8001->data[0] & W8001_TOUCH_BYTE);
	if (tmp == W8001_TOUCH_BYTE)
	break;

	w8001->idx = 0;
	parse_data(w8001->data, &coord);
	report_pen_events(w8001, &coord);
	break;

	/* control packet */
	case W8001_PKTLEN_TPCCTL - 1:
	tmp = (w8001->data[0] & W8001_TOUCH_MASK);
	if (tmp == W8001_TOUCH_BYTE)
	break;

	w8001->idx = 0;
	memcpy(w8001->response, w8001->data, W8001_MAX_LENGTH);
	w8001->response_type = W8001_QUERY_PACKET;
	complete(&w8001->cmd_done);
	break;

	/* 2 finger touch packet */
	case W8001_PKTLEN_TOUCH2FG - 1:
	w8001->idx = 0;
	parse_touch(w8001);
	break;
	}

	return IRQ_HANDLED;
	}

	static int w8001_command(struct w8001 *w8001, unsigned char command,
	bool wait_response)
	{
	int rc;

	w8001->response_type = 0;
	init_completion(&w8001->cmd_done);

	rc = serio_write(w8001->serio, command);
	if (rc == 0 && wait_response) {

	wait_for_completion_timeout(&w8001->cmd_done, HZ);
	if (w8001->response_type != W8001_QUERY_PACKET)
	rc = -EIO;
	}

	return rc;
	}

	static int w8001_setup(struct w8001 *w8001)
	{
	struct input_dev *dev = w8001->dev;
	struct w8001_coord coord;
	int error;

	error = w8001_command(w8001, W8001_CMD_QUERY, true);
	if (error)
	return error;

	parse_data(w8001->response, &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);

	error = w8001_command(w8001, W8001_CMD_TOUCHQUERY, true);
	if (!error) {
	struct w8001_touch_query touch;

	parse_touchquery(w8001->response, &touch);

	switch (touch.sensor_id) {
	case 0:
	case 2:
	w8001->pktlen = W8001_PKTLEN_TOUCH93;
	break;
	case 1:
	case 3:
	case 4:
	w8001->pktlen = W8001_PKTLEN_TOUCH9A;
	break;
	case 5:
	w8001->pktlen = W8001_PKTLEN_TOUCH2FG;

	input_mt_create_slots(dev, 2);
	input_set_abs_params(dev, ABS_MT_TRACKING_ID,
	0, MAX_TRACKING_ID, 0, 0);
	input_set_abs_params(dev, ABS_MT_POSITION_X,
	0, touch.x, 0, 0);
	input_set_abs_params(dev, ABS_MT_POSITION_Y,
	0, touch.y, 0, 0);
	input_set_abs_params(dev, ABS_MT_TOOL_TYPE,
	0, 0, 0, 0);
	break;
	}
	}

	return w8001_command(w8001, W8001_CMD_START, false);
	}

	/*
	* 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;
	w8001->trkid[0] = w8001->trkid[1] = -1;
	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);
	input_dev->keybit[BIT_WORD(BTN_TOOL_PEN)] \|= BIT_MASK(BTN_TOOL_PEN);
	input_dev->keybit[BIT_WORD(BTN_TOOL_RUBBER)] \|= BIT_MASK(BTN_TOOL_RUBBER);
	input_dev->keybit[BIT_WORD(BTN_STYLUS)] \|= BIT_MASK(BTN_STYLUS);
	input_dev->keybit[BIT_WORD(BTN_STYLUS2)] \|= BIT_MASK(BTN_STYLUS2);

	serio_set_drvdata(serio, w8001);
	err = serio_open(serio, drv);
	if (err)
	goto fail2;

	err = w8001_setup(w8001);
	if (err)
	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);