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
  47 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  48 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
  49 MODULE_LICENSE("GPL");
  50
  51 static 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)
  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
  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 -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
 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 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
 137 static int __devexit q40kbd_remove(struct platform_device *dev)
 138 {
 139         serio_unregister_port(q40kbd_port);
 140
 141         return 0;
 142 }
 143
 144 static 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
 153 static 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
 181 static void __exit q40kbd_exit(void)
 182 {
 183         platform_device_unregister(q40kbd_device);
 184         platform_driver_unregister(&q40kbd_driver);
 185 }
 186
 187 module_init(q40kbd_init);
 188 module_exit(q40kbd_exit);