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/*

 * MicroTouch (3M) serial touchscreen driver

 *

 * Copyright (c) 2004 Vojtech Pavlik

 */

/*

 * 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 Dan Streetman <ddstreet@ieee.org>

 *   Copied elo.c and edited for MicroTouch protocol

 */

#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     "MicroTouch serial touchscreen driver"

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

/*

 * Definitions & global arrays.

 */

#define MTOUCH_FORMAT_TABLET_STATUS_BIT 0x80

#define MTOUCH_FORMAT_TABLET_TOUCH_BIT 0x40

#define MTOUCH_FORMAT_TABLET_LENGTH 5

#define MTOUCH_RESPONSE_BEGIN_BYTE 0x01

#define MTOUCH_RESPONSE_END_BYTE 0x0d

/* todo: check specs for max length of all responses */

#define MTOUCH_MAX_LENGTH 16

#define MTOUCH_MIN_XC 0

#define MTOUCH_MAX_XC 0x3fff

#define MTOUCH_MIN_YC 0

#define MTOUCH_MAX_YC 0x3fff

#define MTOUCH_GET_XC(data) (((data[2])<<7) | data[1])

#define MTOUCH_GET_YC(data) (((data[4])<<7) | data[3])

#define MTOUCH_GET_TOUCHED(data) (MTOUCH_FORMAT_TABLET_TOUCH_BIT & data[0])

/*

 * Per-touchscreen data.

 */

struct mtouch {

        struct input_dev *dev;

        struct serio *serio;

        int idx;

        unsigned char data[MTOUCH_MAX_LENGTH];

        char phys[32];

};

static void mtouch_process_format_tablet(struct mtouch *mtouch)

{

        struct input_dev *dev = mtouch->dev;

        if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) {

                input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data));

                input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data));

                input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data));

                input_sync(dev);

                mtouch->idx = 0;

        }

}

static void mtouch_process_response(struct mtouch *mtouch)

{

        if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) {

                /* FIXME - process response */

                mtouch->idx = 0;

        } else if (MTOUCH_MAX_LENGTH == mtouch->idx) {

                printk(KERN_ERR "mtouch.c: too many response bytes\n");

                mtouch->idx = 0;

        }

}

static irqreturn_t mtouch_interrupt(struct serio *serio,

                unsigned char data, unsigned int flags)

{

        struct mtouch* mtouch = serio_get_drvdata(serio);

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

        if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0])

                mtouch_process_format_tablet(mtouch);

        else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0])

                mtouch_process_response(mtouch);

        else

                printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]);

        return IRQ_HANDLED;

}

/*

 * mtouch_disconnect() is the opposite of mtouch_connect()

 */

static void mtouch_disconnect(struct serio *serio)

{

        struct mtouch* mtouch = serio_get_drvdata(serio);

        input_get_device(mtouch->dev);

        input_unregister_device(mtouch->dev);

        serio_close(serio);

        serio_set_drvdata(serio, NULL);

        input_put_device(mtouch->dev);

        kfree(mtouch);

}

/*

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

 * new serio device that supports MicroTouch (Format Tablet) protocol and registers it as

 * an input device.

 */

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

{

        struct mtouch *mtouch;

        struct input_dev *input_dev;

        int err;

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

        input_dev = input_allocate_device();

        if (!mtouch || !input_dev) {

                err = -ENOMEM;

                goto fail1;

        }

        mtouch->serio = serio;

        mtouch->dev = input_dev;

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

        input_dev->name = "MicroTouch Serial TouchScreen";

        input_dev->phys = mtouch->phys;

        input_dev->id.bustype = BUS_RS232;

        input_dev->id.vendor = SERIO_MICROTOUCH;

        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(mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0);

        input_set_abs_params(mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0);

        serio_set_drvdata(serio, mtouch);

        err = serio_open(serio, drv);

        if (err)

                goto fail2;

        err = input_register_device(mtouch->dev);

        if (err)

                goto fail3;

        return 0;

 fail3: serio_close(serio);

 fail2: serio_set_drvdata(serio, NULL);

 fail1: input_free_device(input_dev);

        kfree(mtouch);

        return err;

}

/*

 * The serio driver structure.

 */

static struct serio_device_id mtouch_serio_ids[] = {

        {

                .type   = SERIO_RS232,

                .proto  = SERIO_MICROTOUCH,

                .id     = SERIO_ANY,

                .extra  = SERIO_ANY,

        },

        { 0 }

};

MODULE_DEVICE_TABLE(serio, mtouch_serio_ids);

static struct serio_driver mtouch_drv = {

        .driver         = {

                .name   = "mtouch",

        },

        .description    = DRIVER_DESC,

        .id_table       = mtouch_serio_ids,

        .interrupt      = mtouch_interrupt,

        .connect        = mtouch_connect,

        .disconnect     = mtouch_disconnect,

};

/*

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

 */

static int __init mtouch_init(void)

{

        return serio_register_driver(&mtouch_drv);

}

static void __exit mtouch_exit(void)

{

        serio_unregister_driver(&mtouch_drv);

}

module_init(mtouch_init);

module_exit(mtouch_exit);