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/*

 * Fujitsu serial touchscreen driver

 *

 * Copyright (c) Dmitry Torokhov <dtor@mail.ru>

 */

/*

 * 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     "Fujitsu serial touchscreen driver"

MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

#define FUJITSU_LENGTH 5

/*

 * Per-touchscreen data.

 */

struct fujitsu {

        struct input_dev *dev;

        struct serio *serio;

        int idx;

        unsigned char data[FUJITSU_LENGTH];

        char phys[32];

};

/*

 * Decode serial data (5 bytes per packet)

 * First byte

 * 1 C 0 0 R S S S

 * Where C is 1 while in calibration mode (which we don't use)

 * R is 1 when no coordinate corection was done.

 * S are button state

 */

static irqreturn_t fujitsu_interrupt(struct serio *serio,

                                     unsigned char data, unsigned int flags)

{

        struct fujitsu *fujitsu = serio_get_drvdata(serio);

        struct input_dev *dev = fujitsu->dev;

        if (fujitsu->idx == 0) {

                /* resync skip until start of frame */

                if ((data & 0xf0) != 0x80)

                        return IRQ_HANDLED;

        } else {

                /* resync skip garbage */

                if (data & 0x80) {

                        fujitsu->idx = 0;

                        return IRQ_HANDLED;

                }

        }

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

        if (fujitsu->idx == FUJITSU_LENGTH) {

                input_report_abs(dev, ABS_X,

                                 (fujitsu->data[2] << 7) | fujitsu->data[1]);

                input_report_abs(dev, ABS_Y,

                                 (fujitsu->data[4] << 7) | fujitsu->data[3]);

                input_report_key(dev, BTN_TOUCH,

                                 (fujitsu->data[0] & 0x03) != 2);

                input_sync(dev);

                fujitsu->idx = 0;

        }

        return IRQ_HANDLED;

}

/*

 * fujitsu_disconnect() is the opposite of fujitsu_connect()

 */

static void fujitsu_disconnect(struct serio *serio)

{

        struct fujitsu *fujitsu = serio_get_drvdata(serio);

        input_get_device(fujitsu->dev);

        input_unregister_device(fujitsu->dev);

        serio_close(serio);

        serio_set_drvdata(serio, NULL);

        input_put_device(fujitsu->dev);

        kfree(fujitsu);

}

/*

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

 * new serio device that supports the Fujitsu protocol and registers it

 * as input device.

 */

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

{

        struct fujitsu *fujitsu;

        struct input_dev *input_dev;

        int err;

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

        input_dev = input_allocate_device();

        if (!fujitsu || !input_dev) {

                err = -ENOMEM;

                goto fail1;

        }

        fujitsu->serio = serio;

        fujitsu->dev = input_dev;

        snprintf(fujitsu->phys, sizeof(fujitsu->phys),

                 "%s/input0", serio->phys);

        input_dev->name = "Fujitsu Serial Touchscreen";

        input_dev->phys = fujitsu->phys;

        input_dev->id.bustype = BUS_RS232;

        input_dev->id.vendor = SERIO_FUJITSU;

        input_dev->id.product = 0;

        input_dev->id.version = 0x0100;

        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, 0, 4096, 0, 0);

        input_set_abs_params(input_dev, ABS_Y, 0, 4096, 0, 0);

        serio_set_drvdata(serio, fujitsu);

        err = serio_open(serio, drv);

        if (err)

                goto fail2;

        err = input_register_device(fujitsu->dev);

        if (err)

                goto fail3;

        return 0;

 fail3:

        serio_close(serio);

 fail2:

        serio_set_drvdata(serio, NULL);

 fail1:

        input_free_device(input_dev);

        kfree(fujitsu);

        return err;

}

/*

 * The serio driver structure.

 */

static struct serio_device_id fujitsu_serio_ids[] = {

        {

                .type   = SERIO_RS232,

                .proto  = SERIO_FUJITSU,

                .id     = SERIO_ANY,

                .extra  = SERIO_ANY,

        },

        { 0 }

};

MODULE_DEVICE_TABLE(serio, fujitsu_serio_ids);

static struct serio_driver fujitsu_drv = {

        .driver         = {

                .name   = "fujitsu_ts",

        },

        .description    = DRIVER_DESC,

        .id_table       = fujitsu_serio_ids,

        .interrupt      = fujitsu_interrupt,

        .connect        = fujitsu_connect,

        .disconnect     = fujitsu_disconnect,

};

static int __init fujitsu_init(void)

{

        return serio_register_driver(&fujitsu_drv);

}

static void __exit fujitsu_exit(void)

{

        serio_unregister_driver(&fujitsu_drv);

}

module_init(fujitsu_init);

module_exit(fujitsu_exit);