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
  46 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  47 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
  48 MODULE_LICENSE("GPL");
  49
  50 static DEFINE_SPINLOCK(q40kbd_lock);
  51 static struct serio *q40kbd_port;
  52 static struct platform_device *q40kbd_device;
  53
  54 static 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
  74 static 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
  92 static 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
 108 static 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
 117 static 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
 136 static int __devexit q40kbd_remove(struct platform_device *dev)
 137 {
 138         serio_unregister_port(q40kbd_port);
 139
 140         return 0;
 141 }
 142
 143 static 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
 152 static 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
 180 static void __exit q40kbd_exit(void)
 181 {
 182         platform_device_unregister(q40kbd_device);
 183         platform_driver_unregister(&q40kbd_driver);
 184 }
 185
 186 module_init(q40kbd_init);
 187 module_exit(q40kbd_exit);