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xtkbd.c

/*
 * $Id: xtkbd.c,v 1.11 2001/09/25 10:12:07 vojtech Exp $
 *
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 */

/*
 * XT keyboard 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/slab.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/init.h>
#include <linux/serio.h>

#define DRIVER_DESC     "XT keyboard driver"

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

#define XTKBD_EMUL0     0xe0
#define XTKBD_EMUL1     0xe1
#define XTKBD_KEY 0x7f
#define XTKBD_RELEASE   0x80

static unsigned char xtkbd_keycode[256] = {
        0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
       16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
       32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
       48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
       64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
       80, 81, 82, 83,  0,  0,  0, 87, 88,  0,  0,  0,  0,  0,  0,  0,
        0,  0,  0,  0,  0, 87, 88,  0,  0,  0,  0,110,111,103,108,105,
      106
};

struct xtkbd {
      unsigned char keycode[256];
      struct input_dev *dev;
      struct serio *serio;
      char phys[32];
};

static irqreturn_t xtkbd_interrupt(struct serio *serio,
      unsigned char data, unsigned int flags)
{
      struct xtkbd *xtkbd = serio_get_drvdata(serio);

      switch (data) {
            case XTKBD_EMUL0:
            case XTKBD_EMUL1:
                  break;
            default:

                  if (xtkbd->keycode[data & XTKBD_KEY]) {
                        input_report_key(xtkbd->dev, xtkbd->keycode[data & XTKBD_KEY], !(data & XTKBD_RELEASE));
                        input_sync(xtkbd->dev);
                  } else {
                        printk(KERN_WARNING "xtkbd.c: Unknown key (scancode %#x) %s.\n",
                              data & XTKBD_KEY, data & XTKBD_RELEASE ? "released" : "pressed");
                  }
      }
      return IRQ_HANDLED;
}

static int xtkbd_connect(struct serio *serio, struct serio_driver *drv)
{
      struct xtkbd *xtkbd;
      struct input_dev *input_dev;
      int err = -ENOMEM;
      int i;

      xtkbd = kmalloc(sizeof(struct xtkbd), GFP_KERNEL);
      input_dev = input_allocate_device();
      if (!xtkbd || !input_dev)
            goto fail1;

      xtkbd->serio = serio;
      xtkbd->dev = input_dev;
      snprintf(xtkbd->phys, sizeof(xtkbd->phys), "%s/input0", serio->phys);
      memcpy(xtkbd->keycode, xtkbd_keycode, sizeof(xtkbd->keycode));

      input_dev->name = "XT Keyboard";
      input_dev->phys = xtkbd->phys;
      input_dev->id.bustype = BUS_XTKBD;
      input_dev->id.vendor  = 0x0001;
      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 = xtkbd->keycode;
      input_dev->keycodesize = sizeof(unsigned char);
      input_dev->keycodemax = ARRAY_SIZE(xtkbd_keycode);

      for (i = 0; i < 255; i++)
            set_bit(xtkbd->keycode[i], input_dev->keybit);
      clear_bit(0, input_dev->keybit);

      serio_set_drvdata(serio, xtkbd);

      err = serio_open(serio, drv);
      if (err)
            goto fail2;

      err = input_register_device(xtkbd->dev);
      if (err)
            goto fail3;

      return 0;

 fail3:     serio_close(serio);
 fail2:     serio_set_drvdata(serio, NULL);
 fail1:     input_free_device(input_dev);
      kfree(xtkbd);
      return err;
}

static void xtkbd_disconnect(struct serio *serio)
{
      struct xtkbd *xtkbd = serio_get_drvdata(serio);

      serio_close(serio);
      serio_set_drvdata(serio, NULL);
      input_unregister_device(xtkbd->dev);
      kfree(xtkbd);
}

static struct serio_device_id xtkbd_serio_ids[] = {
      {
            .type = SERIO_XT,
            .proto      = SERIO_ANY,
            .id   = SERIO_ANY,
            .extra      = SERIO_ANY,
      },
      { 0 }
};

MODULE_DEVICE_TABLE(serio, xtkbd_serio_ids);

static struct serio_driver xtkbd_drv = {
      .driver           = {
            .name = "xtkbd",
      },
      .description      = DRIVER_DESC,
      .id_table   = xtkbd_serio_ids,
      .interrupt  = xtkbd_interrupt,
      .connect    = xtkbd_connect,
      .disconnect = xtkbd_disconnect,
};

static int __init xtkbd_init(void)
{
      return serio_register_driver(&xtkbd_drv);
}

static void __exit xtkbd_exit(void)
{
      serio_unregister_driver(&xtkbd_drv);
}

module_init(xtkbd_init);
module_exit(xtkbd_exit);

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