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 #include <linux/platform_device.h>
  41
  42 #include <asm/io.h>
  43 #include <asm/uaccess.h>
  44 #include <asm/q40_master.h>
  45 #include <asm/irq.h>
  46 #include <asm/q40ints.h>
  47
  48 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  49 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
  50 MODULE_LICENSE("GPL");
  51
  52 DEFINE_SPINLOCK(q40kbd_lock);
  53 static struct serio *q40kbd_port;
  54 static struct platform_device *q40kbd_device;
  55
  56 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  57 {
  58         unsigned long flags;
  59
  60         spin_lock_irqsave(&q40kbd_lock, flags);
  61
  62         if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
  63                 serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0, regs);
  64
  65         master_outb(-1, KEYBOARD_UNLOCK_REG);
  66
  67         spin_unlock_irqrestore(&q40kbd_lock, flags);
  68
  69         return IRQ_HANDLED;
  70 }
  71
  72 /*
  73  * q40kbd_flush() flushes all data that may be in the keyboard buffers
  74  */
  75
  76 static void q40kbd_flush(void)
  77 {
  78         int maxread = 100;
  79         unsigned long flags;
  80
  81         spin_lock_irqsave(&q40kbd_lock, flags);
  82
  83         while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
  84                 master_inb(KEYCODE_REG);
  85
  86         spin_unlock_irqrestore(&q40kbd_lock, flags);
  87 }
  88
  89 /*
  90  * q40kbd_open() is called when a port is open by the higher layer.
  91  * It allocates the interrupt and enables in in the chip.
  92  */
  93
  94 static int q40kbd_open(struct serio *port)
  95 {
  96         q40kbd_flush();
  97
  98         if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) {
  99                 printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
 100                 return -1;
 101         }
 102
 103         /* off we go */
 104         master_outb(-1, KEYBOARD_UNLOCK_REG);
 105         master_outb(1, KEY_IRQ_ENABLE_REG);
 106
 107         return 0;
 108 }
 109
 110 static void q40kbd_close(struct serio *port)
 111 {
 112         master_outb(0, KEY_IRQ_ENABLE_REG);
 113         master_outb(-1, KEYBOARD_UNLOCK_REG);
 114         free_irq(Q40_IRQ_KEYBOARD, NULL);
 115
 116         q40kbd_flush();
 117 }
 118
 119 static struct serio * __init q40kbd_allocate_port(void)
 120 {
 121         struct serio *serio;
 122
 123         serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
 124         if (serio) {
 125                 memset(serio, 0, sizeof(struct serio));
 126                 serio->id.type          = SERIO_8042;
 127                 serio->open             = q40kbd_open;
 128                 serio->close            = q40kbd_close;
 129                 serio->dev.parent       = &q40kbd_device->dev;
 130                 strlcpy(serio->name, "Q40 Kbd Port", sizeof(serio->name));
 131                 strlcpy(serio->phys, "Q40", sizeof(serio->phys));
 132         }
 133
 134         return serio;
 135 }
 136
 137 static int __init q40kbd_init(void)
 138 {
 139         if (!MACH_IS_Q40)
 140                 return -EIO;
 141
 142         q40kbd_device = platform_device_register_simple("q40kbd", -1, NULL, 0);
 143         if (IS_ERR(q40kbd_device))
 144                 return PTR_ERR(q40kbd_device);
 145
 146         if (!(q40kbd_port = q40kbd_allocate_port())) {
 147                 platform_device_unregister(q40kbd_device);
 148                 return -ENOMEM;
 149         }
 150
 151         serio_register_port(q40kbd_port);
 152         printk(KERN_INFO "serio: Q40 kbd registered\n");
 153
 154         return 0;
 155 }
 156
 157 static void __exit q40kbd_exit(void)
 158 {
 159         serio_unregister_port(q40kbd_port);
 160         platform_device_unregister(q40kbd_device);
 161 }
 162
 163 module_init(q40kbd_init);
 164 module_exit(q40kbd_exit);