Input: add driver for Touchwin serial touchscreens

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

	  module will be called touchright.

config TOUCHSCREEN_TOUCHWIN

	tristate "Touchwin serial touchscreen"

	select SERIO

	help

	  Say Y here if you have a Touchwin 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 touchwin.

endif

obj-$(CONFIG_TOUCHSCREEN_HP600)	+= hp680_ts_input.o

obj-$(CONFIG_TOUCHSCREEN_PENMOUNT)	+= penmount.o

obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT)	+= touchright.o

obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN)	+= touchwin.o

/*

 * Touchwindow serial touchscreen driver

 *

 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>

 *

 * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)

 * Copyright (c) 2004 Vojtech Pavlik

 * and Dan Streetman <ddstreet@ieee.org>

 */

/*

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published

 * by the Free Software Foundation.

 */

/*

 * 2005/02/19 Rick Koch:

 *   The Touchwindow I used is made by Edmark Corp. and

 *   constantly outputs a stream of 0's unless it is touched.

 *   It then outputs 3 bytes: X, Y, and a copy of Y.

 */

#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>

#define DRIVER_DESC	"Touchwindow serial touchscreen driver"

MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

/*

 * Definitions & global arrays.

 */

#define TW_LENGTH 3

#define TW_MIN_XC 0

#define TW_MAX_XC 0xff

#define TW_MIN_YC 0

#define TW_MAX_YC 0xff

/*

 * Per-touchscreen data.

 */

struct tw {

	struct input_dev *dev;

	struct serio *serio;

	int idx;

	int touched;

	unsigned char data[TW_LENGTH];

	char phys[32];

};

static irqreturn_t tw_interrupt(struct serio *serio,

		unsigned char data, unsigned int flags, struct pt_regs *regs)

{

	struct tw *tw = serio_get_drvdata(serio);

	struct input_dev *dev = tw->dev;

	if (data) {		/* touch */

		tw->touched = 1;

		tw->data[tw->idx++] = data;

		/* verify length and that the two Y's are the same */

		if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) {

			input_regs(dev, regs);

			input_report_abs(dev, ABS_X, tw->data[0]);

			input_report_abs(dev, ABS_Y, tw->data[1]);

			input_report_key(dev, BTN_TOUCH, 1);

			input_sync(dev);

			tw->idx = 0;

		}

	} else if (tw->touched) {	/* untouch */

		input_report_key(dev, BTN_TOUCH, 0);

		input_sync(dev);

		tw->idx = 0;

		tw->touched = 0;

	}

	return IRQ_HANDLED;

}

/*

 * tw_disconnect() is the opposite of tw_connect()

 */

static void tw_disconnect(struct serio *serio)

{

	struct tw *tw = serio_get_drvdata(serio);

	input_get_device(tw->dev);

	input_unregister_device(tw->dev);

	serio_close(serio);

	serio_set_drvdata(serio, NULL);

	input_put_device(tw->dev);

	kfree(tw);

}

/*

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

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

 * an input device.

 */

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

{

	struct tw *tw;

	struct input_dev *input_dev;

	int err;

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

	input_dev = input_allocate_device();

	if (!tw || !input_dev) {

		err = -ENOMEM;

		goto fail1;

	}

	tw->serio = serio;

	tw->dev = input_dev;

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

	input_dev->private = tw;

	input_dev->name = "Touchwindow Serial TouchScreen";

	input_dev->phys = tw->phys;

	input_dev->id.bustype = BUS_RS232;

	input_dev->id.vendor = SERIO_TOUCHWIN;

	input_dev->id.product = 0;

	input_dev->id.version = 0x0100;

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

	input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);

	input_set_abs_params(tw->dev, ABS_X, TW_MIN_XC, TW_MAX_XC, 0, 0);

	input_set_abs_params(tw->dev, ABS_Y, TW_MIN_YC, TW_MAX_YC, 0, 0);

	serio_set_drvdata(serio, tw);

	err = serio_open(serio, drv);

	if (err)

		goto fail2;

	err = input_register_device(tw->dev);

	if (err)

		goto fail3;

	return 0;

 fail3:	serio_close(serio);

 fail2:	serio_set_drvdata(serio, NULL);

 fail1:	input_free_device(input_dev);

	kfree(tw);

	return err;

}

/*

 * The serio driver structure.

 */

static struct serio_device_id tw_serio_ids[] = {

	{

		.type	= SERIO_RS232,

		.proto	= SERIO_TOUCHWIN,

		.id	= SERIO_ANY,

		.extra	= SERIO_ANY,

	},

	{ 0 }

};

MODULE_DEVICE_TABLE(serio, tw_serio_ids);

static struct serio_driver tw_drv = {

	.driver		= {

		.name	= "touchwin",

	},

	.description	= DRIVER_DESC,

	.id_table	= tw_serio_ids,

	.interrupt	= tw_interrupt,

	.connect	= tw_connect,

	.disconnect	= tw_disconnect,

};

/*

 * The functions for inserting/removing us as a module.

 */

static int __init tw_init(void)

{

	serio_register_driver(&tw_drv);

	return 0;

}

static void __exit tw_exit(void)

{

	serio_unregister_driver(&tw_drv);

}

module_init(tw_init);

module_exit(tw_exit);

#define SERIO_MICROTOUCH	0x30

#define SERIO_PENMOUNT	0x31

#define SERIO_TOUCHRIGHT	0x32

#define SERIO_TOUCHWIN	0x33

#endif