165 lines
4.1 KiB
C
165 lines
4.1 KiB
C
/*
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* $Id: q40kbd.c,v 1.12 2002/02/02 22:26:44 vojtech Exp $
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*
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* Copyright (c) 2000-2001 Vojtech Pavlik
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*
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* Based on the work of:
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* Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
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*/
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/*
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* Q40 PS/2 keyboard controller driver for Linux/m68k
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Should you need to contact me, the author, you can do so either by
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* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
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* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/serio.h>
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#include <linux/interrupt.h>
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#include <linux/err.h>
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#include <linux/bitops.h>
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#include <linux/platform_device.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/q40_master.h>
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#include <asm/irq.h>
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#include <asm/q40ints.h>
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
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MODULE_LICENSE("GPL");
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DEFINE_SPINLOCK(q40kbd_lock);
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static struct serio *q40kbd_port;
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static struct platform_device *q40kbd_device;
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static irqreturn_t q40kbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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unsigned long flags;
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spin_lock_irqsave(&q40kbd_lock, flags);
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if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
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serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0, regs);
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master_outb(-1, KEYBOARD_UNLOCK_REG);
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spin_unlock_irqrestore(&q40kbd_lock, flags);
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return IRQ_HANDLED;
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}
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/*
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* q40kbd_flush() flushes all data that may be in the keyboard buffers
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*/
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static void q40kbd_flush(void)
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{
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int maxread = 100;
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unsigned long flags;
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spin_lock_irqsave(&q40kbd_lock, flags);
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while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
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master_inb(KEYCODE_REG);
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spin_unlock_irqrestore(&q40kbd_lock, flags);
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}
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/*
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* q40kbd_open() is called when a port is open by the higher layer.
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* It allocates the interrupt and enables in in the chip.
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*/
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static int q40kbd_open(struct serio *port)
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{
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q40kbd_flush();
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if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) {
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printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
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return -1;
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}
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/* off we go */
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master_outb(-1, KEYBOARD_UNLOCK_REG);
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master_outb(1, KEY_IRQ_ENABLE_REG);
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return 0;
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}
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static void q40kbd_close(struct serio *port)
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{
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master_outb(0, KEY_IRQ_ENABLE_REG);
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master_outb(-1, KEYBOARD_UNLOCK_REG);
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free_irq(Q40_IRQ_KEYBOARD, NULL);
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q40kbd_flush();
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}
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static struct serio * __init q40kbd_allocate_port(void)
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{
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struct serio *serio;
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serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
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if (serio) {
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memset(serio, 0, sizeof(struct serio));
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serio->id.type = SERIO_8042;
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serio->open = q40kbd_open;
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serio->close = q40kbd_close;
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serio->dev.parent = &q40kbd_device->dev;
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strlcpy(serio->name, "Q40 Kbd Port", sizeof(serio->name));
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strlcpy(serio->phys, "Q40", sizeof(serio->phys));
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}
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return serio;
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}
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static int __init q40kbd_init(void)
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{
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if (!MACH_IS_Q40)
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return -EIO;
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q40kbd_device = platform_device_register_simple("q40kbd", -1, NULL, 0);
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if (IS_ERR(q40kbd_device))
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return PTR_ERR(q40kbd_device);
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if (!(q40kbd_port = q40kbd_allocate_port())) {
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platform_device_unregister(q40kbd_device);
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return -ENOMEM;
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}
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serio_register_port(q40kbd_port);
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printk(KERN_INFO "serio: Q40 kbd registered\n");
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return 0;
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}
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static void __exit q40kbd_exit(void)
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{
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serio_unregister_port(q40kbd_port);
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platform_device_unregister(q40kbd_device);
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}
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module_init(q40kbd_init);
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module_exit(q40kbd_exit);
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