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/*

 * $Id: rpckbd.c,v 1.7 2001/09/25 10:12:07 vojtech Exp $

 *

 *  Copyright (c) 2000-2001 Vojtech Pavlik

 *  Copyright (c) 2002 Russell King

 */

/*

 * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM

 */

/*

 * 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/interrupt.h>

#include <linux/init.h>

#include <linux/serio.h>

#include <linux/err.h>

#include <linux/platform_device.h>

#include <asm/irq.h>

#include <asm/hardware.h>

#include <asm/io.h>

#include <asm/hardware/iomd.h>

#include <asm/system.h>

MODULE_AUTHOR("Vojtech Pavlik, Russell King");

MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");

MODULE_LICENSE("GPL");

static int rpckbd_write(struct serio *port, unsigned char val)

{

        while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))

                cpu_relax();

        iomd_writeb(val, IOMD_KARTTX);

        return 0;

}

static irqreturn_t rpckbd_rx(int irq, void *dev_id)

{

        struct serio *port = dev_id;

        unsigned int byte;

        int handled = IRQ_NONE;

        while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {

                byte = iomd_readb(IOMD_KARTRX);

                serio_interrupt(port, byte, 0);

                handled = IRQ_HANDLED;

        }

        return handled;

}

static irqreturn_t rpckbd_tx(int irq, void *dev_id)

{

        return IRQ_HANDLED;

}

static int rpckbd_open(struct serio *port)

{

        /* Reset the keyboard state machine. */

        iomd_writeb(0, IOMD_KCTRL);

        iomd_writeb(8, IOMD_KCTRL);

        iomd_readb(IOMD_KARTRX);

        if (request_irq(IRQ_KEYBOARDRX, rpckbd_rx, 0, "rpckbd", port) != 0) {

                printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");

                return -EBUSY;

        }

        if (request_irq(IRQ_KEYBOARDTX, rpckbd_tx, 0, "rpckbd", port) != 0) {

                printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");

                free_irq(IRQ_KEYBOARDRX, NULL);

                return -EBUSY;

        }

        return 0;

}

static void rpckbd_close(struct serio *port)

{

        free_irq(IRQ_KEYBOARDRX, port);

        free_irq(IRQ_KEYBOARDTX, port);

}

/*

 * Allocate and initialize serio structure for subsequent registration

 * with serio core.

 */

static int __devinit rpckbd_probe(struct platform_device *dev)

{

        struct serio *serio;

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

        if (!serio)

                return -ENOMEM;

        serio->id.type          = SERIO_8042;

        serio->write            = rpckbd_write;

        serio->open             = rpckbd_open;

        serio->close            = rpckbd_close;

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

        strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));

        strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));

        platform_set_drvdata(dev, serio);

        serio_register_port(serio);

        return 0;

}

static int __devexit rpckbd_remove(struct platform_device *dev)

{

        struct serio *serio = platform_get_drvdata(dev);

        serio_unregister_port(serio);

        return 0;

}

static struct platform_driver rpckbd_driver = {

        .probe          = rpckbd_probe,

        .remove         = __devexit_p(rpckbd_remove),

        .driver         = {

                .name   = "kart",

        },

};

static int __init rpckbd_init(void)

{

        return platform_driver_register(&rpckbd_driver);

}

static void __exit rpckbd_exit(void)

{

        platform_driver_unregister(&rpckbd_driver);

}

module_init(rpckbd_init);

module_exit(rpckbd_exit);