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#include <linux/slab.h>
  40
  41#include <asm/io.h>
  42#include <asm/uaccess.h>
  43#include <asm/q40_master.h>
  44#include <asm/irq.h>
  45#include <asm/q40ints.h>
  46
  47MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  48MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
  49MODULE_LICENSE("GPL");
  50
  51static DEFINE_SPINLOCK(q40kbd_lock);
  52static struct serio *q40kbd_port;
  53static struct platform_device *q40kbd_device;
  54
  55static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
  56{
  57        unsigned long flags;
  58
  59        spin_lock_irqsave(&q40kbd_lock, flags);
  60
  61        if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
  62                serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0);
  63
  64        master_outb(-1, KEYBOARD_UNLOCK_REG);
  65
  66        spin_unlock_irqrestore(&q40kbd_lock, flags);
  67
  68        return IRQ_HANDLED;
  69}
  70
  71/*
  72 * q40kbd_flush() flushes all data that may be in the keyboard buffers
  73 */
  74
  75static void q40kbd_flush(void)
  76{
  77        int maxread = 100;
  78        unsigned long flags;
  79
  80        spin_lock_irqsave(&q40kbd_lock, flags);
  81
  82        while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
  83                master_inb(KEYCODE_REG);
  84
  85        spin_unlock_irqrestore(&q40kbd_lock, flags);
  86}
  87
  88/*
  89 * q40kbd_open() is called when a port is open by the higher layer.
  90 * It allocates the interrupt and enables in in the chip.
  91 */
  92
  93static int q40kbd_open(struct serio *port)
  94{
  95        q40kbd_flush();
  96
  97        if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) {
  98                printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
  99                return -EBUSY;
 100        }
 101
 102        /* off we go */
 103        master_outb(-1, KEYBOARD_UNLOCK_REG);
 104        master_outb(1, KEY_IRQ_ENABLE_REG);
 105
 106        return 0;
 107}
 108
 109static void q40kbd_close(struct serio *port)
 110{
 111        master_outb(0, KEY_IRQ_ENABLE_REG);
 112        master_outb(-1, KEYBOARD_UNLOCK_REG);
 113        free_irq(Q40_IRQ_KEYBOARD, NULL);
 114
 115        q40kbd_flush();
 116}
 117
 118static int __devinit q40kbd_probe(struct platform_device *dev)
 119{
 120        q40kbd_port = kzalloc(sizeof(struct serio), GFP_KERNEL);
 121        if (!q40kbd_port)
 122                return -ENOMEM;
 123
 124        q40kbd_port->id.type    = SERIO_8042;
 125        q40kbd_port->open       = q40kbd_open;
 126        q40kbd_port->close      = q40kbd_close;
 127        q40kbd_port->dev.parent = &dev->dev;
 128        strlcpy(q40kbd_port->name, "Q40 Kbd Port", sizeof(q40kbd_port->name));
 129        strlcpy(q40kbd_port->phys, "Q40", sizeof(q40kbd_port->phys));
 130
 131        serio_register_port(q40kbd_port);
 132        printk(KERN_INFO "serio: Q40 kbd registered\n");
 133
 134        return 0;
 135}
 136
 137static int __devexit q40kbd_remove(struct platform_device *dev)
 138{
 139        serio_unregister_port(q40kbd_port);
 140
 141        return 0;
 142}
 143
 144static struct platform_driver q40kbd_driver = {
 145        .driver         = {
 146                .name   = "q40kbd",
 147                .owner  = THIS_MODULE,
 148        },
 149        .probe          = q40kbd_probe,
 150        .remove         = __devexit_p(q40kbd_remove),
 151};
 152
 153static int __init q40kbd_init(void)
 154{
 155        int error;
 156
 157        if (!MACH_IS_Q40)
 158                return -ENODEV;
 159
 160        error = platform_driver_register(&q40kbd_driver);
 161        if (error)
 162                return error;
 163
 164        q40kbd_device = platform_device_alloc("q40kbd", -1);
 165        if (!q40kbd_device)
 166                goto err_unregister_driver;
 167
 168        error = platform_device_add(q40kbd_device);
 169        if (error)
 170                goto err_free_device;
 171
 172        return 0;
 173
 174 err_free_device:
 175        platform_device_put(q40kbd_device);
 176 err_unregister_driver:
 177        platform_driver_unregister(&q40kbd_driver);
 178        return error;
 179}
 180
 181static void __exit q40kbd_exit(void)
 182{
 183        platform_device_unregister(q40kbd_device);
 184        platform_driver_unregister(&q40kbd_driver);
 185}
 186
 187module_init(q40kbd_init);
 188module_exit(q40kbd_exit);
 189