drivers/input/touchscreen/wacom_w8001.c - kernel/windcharger - Git at Google

 /*
  * 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);
	/*
	* 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);