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/*

 * $Id: gunze.c,v 1.12 2001/09/25 10:12:07 vojtech Exp $

 *

 *  Copyright (c) 2000-2001 Vojtech Pavlik

 */

/*

 * Gunze AHL-51S touchscreen driver for Linux

 */

/*

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

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 *

 * Should you need to contact me, the author, you can do so either by

 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:

 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic

 */

#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     "Gunze AHL-51S touchscreen driver"

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

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

/*

 * Definitions & global arrays.

 */

#define GUNZE_MAX_LENGTH        10

/*

 * Per-touchscreen data.

 */

struct gunze {

        struct input_dev *dev;

        struct serio *serio;

        int idx;

        unsigned char data[GUNZE_MAX_LENGTH];

        char phys[32];

};

static void gunze_process_packet(struct gunze* gunze)

{

        struct input_dev *dev = gunze->dev;

        if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||

                (gunze->data[0] != 'T' && gunze->data[0] != 'R')) {

                printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);

                return;

        }

        input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));

        input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));

        input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');

        input_sync(dev);

}

static irqreturn_t gunze_interrupt(struct serio *serio,

                unsigned char data, unsigned int flags)

{

        struct gunze* gunze = serio_get_drvdata(serio);

        if (data == '\r') {

                gunze_process_packet(gunze);

                gunze->idx = 0;

        } else {

                if (gunze->idx < GUNZE_MAX_LENGTH)

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

        }

        return IRQ_HANDLED;

}

/*

 * gunze_disconnect() is the opposite of gunze_connect()

 */

static void gunze_disconnect(struct serio *serio)

{

        struct gunze *gunze = serio_get_drvdata(serio);

        input_get_device(gunze->dev);

        input_unregister_device(gunze->dev);

        serio_close(serio);

        serio_set_drvdata(serio, NULL);

        input_put_device(gunze->dev);

        kfree(gunze);

}

/*

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

 * new serio device that supports Gunze protocol and registers it as

 * an input device.

 */

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

{

        struct gunze *gunze;

        struct input_dev *input_dev;

        int err;

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

        input_dev = input_allocate_device();

        if (!gunze || !input_dev) {

                err = -ENOMEM;

                goto fail1;

        }

        gunze->serio = serio;

        gunze->dev = input_dev;

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

        input_dev->name = "Gunze AHL-51S TouchScreen";

        input_dev->phys = gunze->phys;

        input_dev->id.bustype = BUS_RS232;

        input_dev->id.vendor = SERIO_GUNZE;

        input_dev->id.product = 0x0051;

        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(input_dev, ABS_X, 24, 1000, 0, 0);

        input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);

        serio_set_drvdata(serio, gunze);

        err = serio_open(serio, drv);

        if (err)

                goto fail2;

        err = input_register_device(gunze->dev);

        if (err)

                goto fail3;

        return 0;

 fail3: serio_close(serio);

 fail2: serio_set_drvdata(serio, NULL);

 fail1: input_free_device(input_dev);

        kfree(gunze);

        return err;

}

/*

 * The serio driver structure.

 */

static struct serio_device_id gunze_serio_ids[] = {

        {

                .type   = SERIO_RS232,

                .proto  = SERIO_GUNZE,

                .id     = SERIO_ANY,

                .extra  = SERIO_ANY,

        },

        { 0 }

};

MODULE_DEVICE_TABLE(serio, gunze_serio_ids);

static struct serio_driver gunze_drv = {

        .driver         = {

                .name   = "gunze",

        },

        .description    = DRIVER_DESC,

        .id_table       = gunze_serio_ids,

        .interrupt      = gunze_interrupt,

        .connect        = gunze_connect,

        .disconnect     = gunze_disconnect,

};

/*

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

 */

static int __init gunze_init(void)

{

        return serio_register_driver(&gunze_drv);

}

static void __exit gunze_exit(void)

{

        serio_unregister_driver(&gunze_drv);

}

module_init(gunze_init);

module_exit(gunze_exit);