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/*

 * 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 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_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->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->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_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)

{

        return serio_register_driver(&tw_drv);

}

static void __exit tw_exit(void)

{

        serio_unregister_driver(&tw_drv);

}

module_init(tw_init);

module_exit(tw_exit);