drivers/input/serio/q40kbd.c

   1 /*
   2  * $Id: q40kbd.c,v 1.12 2002/02/02 22:26:44 vojtech Exp $
   3  *
   4  *  Copyright (c) 2000-2001 Vojtech Pavlik
   5  *
   6  *  Based on the work of:
   7  *      Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
   8  */
   9
  10 /*
  11  * Q40 PS/2 keyboard controller driver for Linux/m68k
  12  */
  13
  14 /*
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  28  *
  29  * Should you need to contact me, the author, you can do so either by
  30  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  31  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  32  */
  33
  34 #include <linux/module.h>
  35 #include <linux/init.h>
  36 #include <linux/serio.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/err.h>
  39 #include <linux/bitops.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
  47 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  48 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
  49 MODULE_LICENSE("GPL");
  50
  51 DEFINE_SPINLOCK(q40kbd_lock);
  52 static struct serio *q40kbd_port;
  53 static struct platform_device *q40kbd_device;
  54
  55 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  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, regs);
  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
  75 static 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
  93 static 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 -1;
 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
 109 static 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
 118 static struct serio * __init q40kbd_allocate_port(void)
 119 {
 120         struct serio *serio;
 121
 122         serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
 123         if (serio) {
 124                 memset(serio, 0, sizeof(struct serio));
 125                 serio->id.type          = SERIO_8042;
 126                 serio->open             = q40kbd_open;
 127                 serio->close            = q40kbd_close;
 128                 serio->dev.parent       = &q40kbd_device->dev;
 129                 strlcpy(serio->name, "Q40 Kbd Port", sizeof(serio->name));
 130                 strlcpy(serio->phys, "Q40", sizeof(serio->phys));
 131         }
 132
 133         return serio;
 134 }
 135
 136 static int __init q40kbd_init(void)
 137 {
 138         if (!MACH_IS_Q40)
 139                 return -EIO;
 140
 141         q40kbd_device = platform_device_register_simple("q40kbd", -1, NULL, 0);
 142         if (IS_ERR(q40kbd_device))
 143                 return PTR_ERR(q40kbd_device);
 144
 145         if (!(q40kbd_port = q40kbd_allocate_port())) {
 146                 platform_device_unregister(q40kbd_device);
 147                 return -ENOMEM;
 148         }
 149
 150         serio_register_port(q40kbd_port);
 151         printk(KERN_INFO "serio: Q40 kbd registered\n");
 152
 153         return 0;
 154 }
 155
 156 static void __exit q40kbd_exit(void)
 157 {
 158         serio_unregister_port(q40kbd_port);
 159         platform_device_unregister(q40kbd_device);
 160 }
 161
 162 module_init(q40kbd_init);
 163 module_exit(q40kbd_exit);