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/*

 * Stowaway keyboard driver for Linux

 */

/*

 *  Copyright (c) 2006 Marek Vasut

 *

 *  Based on Newton keyboard driver for Linux

 *  by Justin Cormack

 */

/*

 * 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 <marek.vasut@gmail.com>, or by paper mail:

 * Marek Vasut, Liskovecka 559, Frydek-Mistek, 738 01 Czech Republic

 */

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/input.h>

#include <linux/init.h>

#include <linux/serio.h>

#define DRIVER_DESC     "Stowaway keyboard driver"

MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

#define SKBD_KEY_MASK   0x7f

#define SKBD_RELEASE    0x80

static unsigned char skbd_keycode[128] = {

        KEY_1, KEY_2, KEY_3, KEY_Z, KEY_4, KEY_5, KEY_6, KEY_7,

        0, KEY_Q, KEY_W, KEY_E, KEY_R, KEY_T, KEY_Y, KEY_GRAVE,

        KEY_X, KEY_A, KEY_S, KEY_D, KEY_F, KEY_G, KEY_H, KEY_SPACE,

        KEY_CAPSLOCK, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0,

        0, 0, 0, KEY_LEFTALT, 0, 0, 0, 0,

        0, 0, 0, 0, KEY_C, KEY_V, KEY_B, KEY_N,

        KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, KEY_HOME, KEY_8, KEY_9, KEY_0, KEY_ESC,

        KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, KEY_END, KEY_U, KEY_I, KEY_O, KEY_P,

        KEY_APOSTROPHE, KEY_ENTER, KEY_PAGEUP,0, KEY_J, KEY_K, KEY_L, KEY_SEMICOLON,

        KEY_SLASH, KEY_UP, KEY_PAGEDOWN, 0,KEY_M, KEY_COMMA, KEY_DOT, KEY_INSERT,

        KEY_DELETE, KEY_LEFT, KEY_DOWN, KEY_RIGHT,  0, 0, 0,

        KEY_LEFTSHIFT, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0,

        0, 0, 0, 0, 0, 0, 0, 0,

        0, 0, 0, 0, 0, 0, 0, 0,

        0, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7,

        KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, 0, 0, 0

};

struct skbd {

        unsigned char keycode[128];

        struct input_dev *dev;

        struct serio *serio;

        char phys[32];

};

static irqreturn_t skbd_interrupt(struct serio *serio, unsigned char data,

                                  unsigned int flags)

{

        struct skbd *skbd = serio_get_drvdata(serio);

        struct input_dev *dev = skbd->dev;

        if (skbd->keycode[data & SKBD_KEY_MASK]) {

                input_report_key(dev, skbd->keycode[data & SKBD_KEY_MASK],

                                 !(data & SKBD_RELEASE));

                input_sync(dev);

        }

        return IRQ_HANDLED;

}

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

{

        struct skbd *skbd;

        struct input_dev *input_dev;

        int err = -ENOMEM;

        int i;

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

        input_dev = input_allocate_device();

        if (!skbd || !input_dev)

                goto fail1;

        skbd->serio = serio;

        skbd->dev = input_dev;

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

        memcpy(skbd->keycode, skbd_keycode, sizeof(skbd->keycode));

        input_dev->name = "Stowaway Keyboard";

        input_dev->phys = skbd->phys;

        input_dev->id.bustype = BUS_RS232;

        input_dev->id.vendor = SERIO_STOWAWAY;

        input_dev->id.product = 0x0001;

        input_dev->id.version = 0x0100;

        input_dev->dev.parent = &serio->dev;

        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);

        input_dev->keycode = skbd->keycode;

        input_dev->keycodesize = sizeof(unsigned char);

        input_dev->keycodemax = ARRAY_SIZE(skbd_keycode);

        for (i = 0; i < ARRAY_SIZE(skbd_keycode); i++)

                set_bit(skbd_keycode[i], input_dev->keybit);

        clear_bit(0, input_dev->keybit);

        serio_set_drvdata(serio, skbd);

        err = serio_open(serio, drv);

        if (err)

                goto fail2;

        err = input_register_device(skbd->dev);

        if (err)

                goto fail3;

        return 0;

 fail3: serio_close(serio);

 fail2: serio_set_drvdata(serio, NULL);

 fail1: input_free_device(input_dev);

        kfree(skbd);

        return err;

}

static void skbd_disconnect(struct serio *serio)

{

        struct skbd *skbd = serio_get_drvdata(serio);

        serio_close(serio);

        serio_set_drvdata(serio, NULL);

        input_unregister_device(skbd->dev);

        kfree(skbd);

}

static struct serio_device_id skbd_serio_ids[] = {

        {

                .type   = SERIO_RS232,

                .proto  = SERIO_STOWAWAY,

                .id     = SERIO_ANY,

                .extra  = SERIO_ANY,

        },

        { 0 }

};

MODULE_DEVICE_TABLE(serio, skbd_serio_ids);

static struct serio_driver skbd_drv = {

        .driver         = {

                .name   = "stowaway",

        },

        .description    = DRIVER_DESC,

        .id_table       = skbd_serio_ids,

        .interrupt      = skbd_interrupt,

        .connect        = skbd_connect,

        .disconnect     = skbd_disconnect,

};

static int __init skbd_init(void)

{

        return serio_register_driver(&skbd_drv);

}

static void __exit skbd_exit(void)

{

        serio_unregister_driver(&skbd_drv);

}

module_init(skbd_init);

module_exit(skbd_exit);