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q40kbd.c

/*
 * $Id: q40kbd.c,v 1.12 2002/02/02 22:26:44 vojtech Exp $
 *
 *  Copyright (c) 2000-2001 Vojtech Pavlik
 *
 *  Based on the work of:
 *    Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
 */

/*
 * Q40 PS/2 keyboard controller driver for Linux/m68k
 */

/*
 * 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/module.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/bitops.h>
#include <linux/platform_device.h>

#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/q40_master.h>
#include <asm/irq.h>
#include <asm/q40ints.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
MODULE_LICENSE("GPL");

DEFINE_SPINLOCK(q40kbd_lock);
static struct serio *q40kbd_port;
static struct platform_device *q40kbd_device;

static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
{
      unsigned long flags;

      spin_lock_irqsave(&q40kbd_lock, flags);

      if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
            serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0);

      master_outb(-1, KEYBOARD_UNLOCK_REG);

      spin_unlock_irqrestore(&q40kbd_lock, flags);

      return IRQ_HANDLED;
}

/*
 * q40kbd_flush() flushes all data that may be in the keyboard buffers
 */

static void q40kbd_flush(void)
{
      int maxread = 100;
      unsigned long flags;

      spin_lock_irqsave(&q40kbd_lock, flags);

      while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
            master_inb(KEYCODE_REG);

      spin_unlock_irqrestore(&q40kbd_lock, flags);
}

/*
 * q40kbd_open() is called when a port is open by the higher layer.
 * It allocates the interrupt and enables in in the chip.
 */

static int q40kbd_open(struct serio *port)
{
      q40kbd_flush();

      if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) {
            printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
            return -EBUSY;
      }

      /* off we go */
      master_outb(-1, KEYBOARD_UNLOCK_REG);
      master_outb(1, KEY_IRQ_ENABLE_REG);

      return 0;
}

static void q40kbd_close(struct serio *port)
{
      master_outb(0, KEY_IRQ_ENABLE_REG);
      master_outb(-1, KEYBOARD_UNLOCK_REG);
      free_irq(Q40_IRQ_KEYBOARD, NULL);

      q40kbd_flush();
}

static int __devinit q40kbd_probe(struct platform_device *dev)
{
      q40kbd_port = kzalloc(sizeof(struct serio), GFP_KERNEL);
      if (!q40kbd_port)
            return -ENOMEM;

      q40kbd_port->id.type    = SERIO_8042;
      q40kbd_port->open = q40kbd_open;
      q40kbd_port->close      = q40kbd_close;
      q40kbd_port->dev.parent = &dev->dev;
      strlcpy(q40kbd_port->name, "Q40 Kbd Port", sizeof(q40kbd_port->name));
      strlcpy(q40kbd_port->phys, "Q40", sizeof(q40kbd_port->phys));

      serio_register_port(q40kbd_port);
      printk(KERN_INFO "serio: Q40 kbd registered\n");

      return 0;
}

static int __devexit q40kbd_remove(struct platform_device *dev)
{
      serio_unregister_port(q40kbd_port);

      return 0;
}

static struct platform_driver q40kbd_driver = {
      .driver           = {
            .name = "q40kbd",
            .owner      = THIS_MODULE,
      },
      .probe            = q40kbd_probe,
      .remove           = __devexit_p(q40kbd_remove),
};

static int __init q40kbd_init(void)
{
      int error;

      if (!MACH_IS_Q40)
            return -EIO;

      error = platform_driver_register(&q40kbd_driver);
      if (error)
            return error;

      q40kbd_device = platform_device_alloc("q40kbd", -1);
      if (!q40kbd_device)
            goto err_unregister_driver;

      error = platform_device_add(q40kbd_device);
      if (error)
            goto err_free_device;

      return 0;

 err_free_device:
      platform_device_put(q40kbd_device);
 err_unregister_driver:
      platform_driver_unregister(&q40kbd_driver);
      return error;
}

static void __exit q40kbd_exit(void)
{
      platform_device_unregister(q40kbd_device);
      platform_driver_unregister(&q40kbd_driver);
}

module_init(q40kbd_init);
module_exit(q40kbd_exit);

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