sound/drivers/pcsp/pcsp_input.c

   1 /*
   2  *  PC Speaker beeper driver for Linux
   3  *
   4  *  Copyright (c) 2002 Vojtech Pavlik
   5  *  Copyright (c) 1992 Orest Zborowski
   6  *
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/input.h>
  17 #include <linux/io.h>
  18 #include "pcsp.h"
  19 #include "pcsp_input.h"
  20
  21 static void pcspkr_do_sound(unsigned int count)
  22 {
  23         unsigned long flags;
  24
  25         raw_spin_lock_irqsave(&i8253_lock, flags);
  26
  27         if (count) {
  28                 /* set command for counter 2, 2 byte write */
  29                 outb_p(0xB6, 0x43);
  30                 /* select desired HZ */
  31                 outb_p(count & 0xff, 0x42);
  32                 outb((count >> 8) & 0xff, 0x42);
  33                 /* enable counter 2 */
  34                 outb_p(inb_p(0x61) | 3, 0x61);
  35         } else {
  36                 /* disable counter 2 */
  37                 outb(inb_p(0x61) & 0xFC, 0x61);
  38         }
  39
  40         raw_spin_unlock_irqrestore(&i8253_lock, flags);
  41 }
  42
  43 void pcspkr_stop_sound(void)
  44 {
  45         pcspkr_do_sound(0);
  46 }
  47
  48 static int pcspkr_input_event(struct input_dev *dev, unsigned int type,
  49                               unsigned int code, int value)
  50 {
  51         unsigned int count = 0;
  52
  53         if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr)
  54                 return 0;
  55
  56         switch (type) {
  57         case EV_SND:
  58                 switch (code) {
  59                 case SND_BELL:
  60                         if (value)
  61                                 value = 1000;
  62                 case SND_TONE:
  63                         break;
  64                 default:
  65                         return -1;
  66                 }
  67                 break;
  68
  69         default:
  70                 return -1;
  71         }
  72
  73         if (value > 20 && value < 32767)
  74                 count = PIT_TICK_RATE / value;
  75
  76         pcspkr_do_sound(count);
  77
  78         return 0;
  79 }
  80
  81 int pcspkr_input_init(struct input_dev **rdev, struct device *dev)
  82 {
  83         int err;
  84
  85         struct input_dev *input_dev = input_allocate_device();
  86         if (!input_dev)
  87                 return -ENOMEM;
  88
  89         input_dev->name = "PC Speaker";
  90         input_dev->phys = "isa0061/input0";
  91         input_dev->id.bustype = BUS_ISA;
  92         input_dev->id.vendor = 0x001f;
  93         input_dev->id.product = 0x0001;
  94         input_dev->id.version = 0x0100;
  95         input_dev->dev.parent = dev;
  96
  97         input_dev->evbit[0] = BIT(EV_SND);
  98         input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
  99         input_dev->event = pcspkr_input_event;
 100
 101         err = input_register_device(input_dev);
 102         if (err) {
 103                 input_free_device(input_dev);
 104                 return err;
 105         }
 106
 107         *rdev = input_dev;
 108         return 0;
 109 }
 110
 111 int pcspkr_input_remove(struct input_dev *dev)
 112 {
 113         pcspkr_stop_sound();
 114         input_unregister_device(dev);   /* this also does kfree() */
 115
 116         return 0;
 117 }