Input: add driver for Touchright serial touchscreens

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

	  module will be called penmount.

config TOUCHSCREEN_TOUCHRIGHT

	tristate "Touchright serial touchscreen"

	select SERIO

	help

	  Say Y here if you have a Touchright 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 touchright.

endif

obj-$(CONFIG_TOUCHSCREEN_MK712)	+= mk712.o

obj-$(CONFIG_TOUCHSCREEN_HP600)	+= hp680_ts_input.o

obj-$(CONFIG_TOUCHSCREEN_PENMOUNT)	+= penmount.o

obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT)	+= touchright.o

/*

 * Touchright 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.

 */

#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	"Touchright serial touchscreen driver"

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

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

/*

 * Definitions & global arrays.

 */

#define TR_FORMAT_TOUCH_BIT	0x01

#define TR_FORMAT_STATUS_BYTE	0x40

#define TR_FORMAT_STATUS_MASK	~TR_FORMAT_TOUCH_BIT

#define TR_LENGTH 5

#define TR_MIN_XC 0

#define TR_MAX_XC 0x1ff

#define TR_MIN_YC 0

#define TR_MAX_YC 0x1ff

/*

 * Per-touchscreen data.

 */

struct tr {

	struct input_dev *dev;

	struct serio *serio;

	int idx;

	unsigned char data[TR_LENGTH];

	char phys[32];

};

static irqreturn_t tr_interrupt(struct serio *serio,

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

{

	struct tr *tr = serio_get_drvdata(serio);

	struct input_dev *dev = tr->dev;

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

	if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) {

		if (++tr->idx == TR_LENGTH) {

			input_regs(dev, regs);

			input_report_abs(dev, ABS_X,

				(tr->data[1] << 5) | (tr->data[2] >> 1));

			input_report_abs(dev, ABS_Y,

				(tr->data[3] << 5) | (tr->data[4] >> 1));

			input_report_key(dev, BTN_TOUCH,

				tr->data[0] & TR_FORMAT_TOUCH_BIT);

			input_sync(dev);

			tr->idx = 0;

		}

	}

	return IRQ_HANDLED;

}

/*

 * tr_disconnect() is the opposite of tr_connect()

 */

static void tr_disconnect(struct serio *serio)

{

	struct tr *tr = serio_get_drvdata(serio);

	input_get_device(tr->dev);

	input_unregister_device(tr->dev);

	serio_close(serio);

	serio_set_drvdata(serio, NULL);

	input_put_device(tr->dev);

	kfree(tr);

}

/*

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

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

 * an input device.

 */

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

{

	struct tr *tr;

	struct input_dev *input_dev;

	int err;

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

	input_dev = input_allocate_device();

	if (!tr || !input_dev) {

		err = -ENOMEM;

		goto fail1;

	}

	tr->serio = serio;

	tr->dev = input_dev;

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

	input_dev->private = tr;

	input_dev->name = "Touchright Serial TouchScreen";

	input_dev->phys = tr->phys;

	input_dev->id.bustype = BUS_RS232;

	input_dev->id.vendor = SERIO_TOUCHRIGHT;

	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(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0);

	input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0);

	serio_set_drvdata(serio, tr);

	err = serio_open(serio, drv);

	if (err)

		goto fail2;

	err = input_register_device(tr->dev);

	if (err)

		goto fail3;

	return 0;

 fail3:	serio_close(serio);

 fail2:	serio_set_drvdata(serio, NULL);

 fail1:	input_free_device(input_dev);

	kfree(tr);

	return err;

}

/*

 * The serio driver structure.

 */

static struct serio_device_id tr_serio_ids[] = {

	{

		.type	= SERIO_RS232,

		.proto	= SERIO_TOUCHRIGHT,

		.id	= SERIO_ANY,

		.extra	= SERIO_ANY,

	},

	{ 0 }

};

MODULE_DEVICE_TABLE(serio, tr_serio_ids);

static struct serio_driver tr_drv = {

	.driver		= {

		.name	= "touchright",

	},

	.description	= DRIVER_DESC,

	.id_table	= tr_serio_ids,

	.interrupt	= tr_interrupt,

	.connect	= tr_connect,

	.disconnect	= tr_disconnect,

};

/*

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

 */

static int __init tr_init(void)

{

	serio_register_driver(&tr_drv);

	return 0;

}

static void __exit tr_exit(void)

{

	serio_unregister_driver(&tr_drv);

}

module_init(tr_init);

module_exit(tr_exit);

#define SERIO_ELO	0x29

#define SERIO_MICROTOUCH	0x30

#define SERIO_PENMOUNT	0x31

#define SERIO_TOUCHRIGHT	0x32

#endif