Subversion Repositories test_project

/*

 * $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);