LXR linux/drivers/input/serio/q40kbd.c

   1/*
   2 *  Copyright (c) 2000-2001 Vojtech Pavlik
   3 *
   4 *  Based on the work of:
   5 *      Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
   6 */
   7
   8/*
   9 * Q40 PS/2 keyboard controller driver for Linux/m68k
  10 */
  11
  12/*
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License as published by
  15 * the Free Software Foundation; either version 2 of the License, or
  16 * (at your option) any later version.
  17 *
  18 * This program is distributed in the hope that it will be useful,
  19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 * GNU General Public License for more details.
  22 *
  23 * You should have received a copy of the GNU General Public License
  24 * along with this program; if not, write to the Free Software
  25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26 *
  27 * Should you need to contact me, the author, you can do so either by
  28 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  29 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  30 */
  31
  32#include <linux/module.h>
  33#include <linux/init.h>
  34#include <linux/serio.h>
  35#include <linux/interrupt.h>
  36#include <linux/err.h>
  37#include <linux/bitops.h>
  38#include <linux/platform_device.h>
  39
  40#include <asm/io.h>
  41#include <asm/uaccess.h>
  42#include <asm/q40_master.h>
  43#include <asm/irq.h>
  44#include <asm/q40ints.h>
  45
  46MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  47MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
  48MODULE_LICENSE("GPL");
  49
  50static DEFINE_SPINLOCK(q40kbd_lock);
  51static struct serio *q40kbd_port;
  52static struct platform_device *q40kbd_device;
  53
  54static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
  55{
  56        unsigned long flags;
  57
  58        spin_lock_irqsave(&q40kbd_lock, flags);
  59
  60        if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
  61                serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0);
  62
  63        master_outb(-1, KEYBOARD_UNLOCK_REG);
  64
  65        spin_unlock_irqrestore(&q40kbd_lock, flags);
  66
  67        return IRQ_HANDLED;
  68}
  69
  70/*
  71 * q40kbd_flush() flushes all data that may be in the keyboard buffers
  72 */
  73
  74static void q40kbd_flush(void)
  75{
  76        int maxread = 100;
  77        unsigned long flags;
  78
  79        spin_lock_irqsave(&q40kbd_lock, flags);
  80
  81        while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
  82                master_inb(KEYCODE_REG);
  83
  84        spin_unlock_irqrestore(&q40kbd_lock, flags);
  85}
  86
  87/*
  88 * q40kbd_open() is called when a port is open by the higher layer.
  89 * It allocates the interrupt and enables in in the chip.
  90 */
  91
  92static int q40kbd_open(struct serio *port)
  93{
  94        q40kbd_flush();
  95
  96        if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) {
  97                printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
  98                return -EBUSY;
  99        }
 100
 101        /* off we go */
 102        master_outb(-1, KEYBOARD_UNLOCK_REG);
 103        master_outb(1, KEY_IRQ_ENABLE_REG);
 104
 105        return 0;
 106}
 107
 108static void q40kbd_close(struct serio *port)
 109{
 110        master_outb(0, KEY_IRQ_ENABLE_REG);
 111        master_outb(-1, KEYBOARD_UNLOCK_REG);
 112        free_irq(Q40_IRQ_KEYBOARD, NULL);
 113
 114        q40kbd_flush();
 115}
 116
 117static int __devinit q40kbd_probe(struct platform_device *dev)
 118{
 119        q40kbd_port = kzalloc(sizeof(struct serio), GFP_KERNEL);
 120        if (!q40kbd_port)
 121                return -ENOMEM;
 122
 123        q40kbd_port->id.type    = SERIO_8042;
 124        q40kbd_port->open       = q40kbd_open;
 125        q40kbd_port->close      = q40kbd_close;
 126        q40kbd_port->dev.parent = &dev->dev;
 127        strlcpy(q40kbd_port->name, "Q40 Kbd Port", sizeof(q40kbd_port->name));
 128        strlcpy(q40kbd_port->phys, "Q40", sizeof(q40kbd_port->phys));
 129
 130        serio_register_port(q40kbd_port);
 131        printk(KERN_INFO "serio: Q40 kbd registered\n");
 132
 133        return 0;
 134}
 135
 136static int __devexit q40kbd_remove(struct platform_device *dev)
 137{
 138        serio_unregister_port(q40kbd_port);
 139
 140        return 0;
 141}
 142
 143static struct platform_driver q40kbd_driver = {
 144        .driver         = {
 145                .name   = "q40kbd",
 146                .owner  = THIS_MODULE,
 147        },
 148        .probe          = q40kbd_probe,
 149        .remove         = __devexit_p(q40kbd_remove),
 150};
 151
 152static int __init q40kbd_init(void)
 153{
 154        int error;
 155
 156        if (!MACH_IS_Q40)
 157                return -ENODEV;
 158
 159        error = platform_driver_register(&q40kbd_driver);
 160        if (error)
 161                return error;
 162
 163        q40kbd_device = platform_device_alloc("q40kbd", -1);
 164        if (!q40kbd_device)
 165                goto err_unregister_driver;
 166
 167        error = platform_device_add(q40kbd_device);
 168        if (error)
 169                goto err_free_device;
 170
 171        return 0;
 172
 173 err_free_device:
 174        platform_device_put(q40kbd_device);
 175 err_unregister_driver:
 176        platform_driver_unregister(&q40kbd_driver);
 177        return error;
 178}
 179
 180static void __exit q40kbd_exit(void)
 181{
 182        platform_device_unregister(q40kbd_device);
 183        platform_driver_unregister(&q40kbd_driver);
 184}
 185
 186module_init(q40kbd_init);
 187module_exit(q40kbd_exit);
 188