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stowaway.c

/*
 * 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);

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