/*
* $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 <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 pt_regs *regs)
{
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, regs);
handled = IRQ_HANDLED;
}
return handled;
}
static irqreturn_t rpckbd_tx(int irq, void *dev_id, struct pt_regs *regs)
{
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 device *dev)
{
struct serio *serio;
serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
if (!serio)
return -ENOMEM;
memset(serio, 0, sizeof(struct serio));
serio->id.type = SERIO_8042;
serio->write = rpckbd_write;
serio->open = rpckbd_open;
serio->close = rpckbd_close;
serio->dev.parent = dev;
strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
dev_set_drvdata(dev, serio);
serio_register_port(serio);
return 0;
}
static int __devexit rpckbd_remove(struct device *dev)
{
struct serio *serio = dev_get_drvdata(dev);
serio_unregister_port(serio);
return 0;
}
static struct device_driver rpckbd_driver = {
.name = "kart",
.bus = &platform_bus_type,
.probe = rpckbd_probe,
.remove = __devexit_p(rpckbd_remove),
};
static int __init rpckbd_init(void)
{
return driver_register(&rpckbd_driver);
}
static void __exit rpckbd_exit(void)
{
driver_unregister(&rpckbd_driver);
}
module_init(rpckbd_init);
module_exit(rpckbd_exit);
