/*
* $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, struct pt_regs *regs)
{
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, regs);
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 -1;
}
/* 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 struct serio * __init q40kbd_allocate_port(void)
{
struct serio *serio;
serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
if (serio) {
memset(serio, 0, sizeof(struct serio));
serio->id.type = SERIO_8042;
serio->open = q40kbd_open;
serio->close = q40kbd_close;
serio->dev.parent = &q40kbd_device->dev;
strlcpy(serio->name, "Q40 Kbd Port", sizeof(serio->name));
strlcpy(serio->phys, "Q40", sizeof(serio->phys));
}
return serio;
}
static int __init q40kbd_init(void)
{
if (!MACH_IS_Q40)
return -EIO;
q40kbd_device = platform_device_register_simple("q40kbd", -1, NULL, 0);
if (IS_ERR(q40kbd_device))
return PTR_ERR(q40kbd_device);
if (!(q40kbd_port = q40kbd_allocate_port())) {
platform_device_unregister(q40kbd_device);
return -ENOMEM;
}
serio_register_port(q40kbd_port);
printk(KERN_INFO "serio: Q40 kbd registered\n");
return 0;
}
static void __exit q40kbd_exit(void)
{
serio_unregister_port(q40kbd_port);
platform_device_unregister(q40kbd_device);
}
module_init(q40kbd_init);
module_exit(q40kbd_exit);
