194 lines
4.5 KiB
C
194 lines
4.5 KiB
C
/*
|
|
* 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/serio.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/err.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/q40_master.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/q40ints.h>
|
|
|
|
#define DRV_NAME "q40kbd"
|
|
|
|
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
|
|
MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" DRV_NAME);
|
|
|
|
struct q40kbd {
|
|
struct serio *port;
|
|
spinlock_t lock;
|
|
};
|
|
|
|
static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct q40kbd *q40kbd = 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(struct q40kbd *q40kbd)
|
|
{
|
|
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);
|
|
}
|
|
|
|
static void q40kbd_stop(void)
|
|
{
|
|
master_outb(0, KEY_IRQ_ENABLE_REG);
|
|
master_outb(-1, KEYBOARD_UNLOCK_REG);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct q40kbd *q40kbd = port->port_data;
|
|
|
|
q40kbd_flush(q40kbd);
|
|
|
|
/* 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)
|
|
{
|
|
struct q40kbd *q40kbd = port->port_data;
|
|
|
|
q40kbd_stop();
|
|
q40kbd_flush(q40kbd);
|
|
}
|
|
|
|
static int q40kbd_probe(struct platform_device *pdev)
|
|
{
|
|
struct q40kbd *q40kbd;
|
|
struct serio *port;
|
|
int error;
|
|
|
|
q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL);
|
|
port = kzalloc(sizeof(struct serio), GFP_KERNEL);
|
|
if (!q40kbd || !port) {
|
|
error = -ENOMEM;
|
|
goto err_free_mem;
|
|
}
|
|
|
|
q40kbd->port = port;
|
|
spin_lock_init(&q40kbd->lock);
|
|
|
|
port->id.type = SERIO_8042;
|
|
port->open = q40kbd_open;
|
|
port->close = q40kbd_close;
|
|
port->port_data = q40kbd;
|
|
port->dev.parent = &pdev->dev;
|
|
strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name));
|
|
strlcpy(port->phys, "Q40", sizeof(port->phys));
|
|
|
|
q40kbd_stop();
|
|
|
|
error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0,
|
|
DRV_NAME, q40kbd);
|
|
if (error) {
|
|
dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
|
|
goto err_free_mem;
|
|
}
|
|
|
|
serio_register_port(q40kbd->port);
|
|
|
|
platform_set_drvdata(pdev, q40kbd);
|
|
printk(KERN_INFO "serio: Q40 kbd registered\n");
|
|
|
|
return 0;
|
|
|
|
err_free_mem:
|
|
kfree(port);
|
|
kfree(q40kbd);
|
|
return error;
|
|
}
|
|
|
|
static int q40kbd_remove(struct platform_device *pdev)
|
|
{
|
|
struct q40kbd *q40kbd = platform_get_drvdata(pdev);
|
|
|
|
/*
|
|
* q40kbd_close() will be called as part of unregistering
|
|
* and will ensure that IRQ is turned off, so it is safe
|
|
* to unregister port first and free IRQ later.
|
|
*/
|
|
serio_unregister_port(q40kbd->port);
|
|
free_irq(Q40_IRQ_KEYBOARD, q40kbd);
|
|
kfree(q40kbd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver q40kbd_driver = {
|
|
.driver = {
|
|
.name = "q40kbd",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.remove = q40kbd_remove,
|
|
};
|
|
|
|
module_platform_driver_probe(q40kbd_driver, q40kbd_probe);
|