drivers/input/misc/pcspkr.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/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/i8253.h>
  18 #include <linux/input.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/timex.h>
  21 #include <linux/io.h>
  22
  23 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  24 MODULE_DESCRIPTION("PC Speaker beeper driver");
  25 MODULE_LICENSE("GPL");
  26 MODULE_ALIAS("platform:pcspkr");
  27
  28 static int pcspkr_event(struct input_dev *dev, unsigned int type,
  29                         unsigned int code, int value)
  30 {
  31         unsigned int count = 0;
  32         unsigned long flags;
  33
  34         if (type != EV_SND)
  35                 return -EINVAL;
  36
  37         switch (code) {
  38         case SND_BELL:
  39                 if (value)
  40                         value = 1000;
  41         case SND_TONE:
  42                 break;
  43         default:
  44                 return -EINVAL;
  45         }
  46
  47         if (value > 20 && value < 32767)
  48                 count = PIT_TICK_RATE / value;
  49
  50         raw_spin_lock_irqsave(&i8253_lock, flags);
  51
  52         if (count) {
  53                 /* set command for counter 2, 2 byte write */
  54                 outb_p(0xB6, 0x43);
  55                 /* select desired HZ */
  56                 outb_p(count & 0xff, 0x42);
  57                 outb((count >> 8) & 0xff, 0x42);
  58                 /* enable counter 2 */
  59                 outb_p(inb_p(0x61) | 3, 0x61);
  60         } else {
  61                 /* disable counter 2 */
  62                 outb(inb_p(0x61) & 0xFC, 0x61);
  63         }
  64
  65         raw_spin_unlock_irqrestore(&i8253_lock, flags);
  66
  67         return 0;
  68 }
  69
  70 static int pcspkr_probe(struct platform_device *dev)
  71 {
  72         struct input_dev *pcspkr_dev;
  73         int err;
  74
  75         pcspkr_dev = input_allocate_device();
  76         if (!pcspkr_dev)
  77                 return -ENOMEM;
  78
  79         pcspkr_dev->name = "PC Speaker";
  80         pcspkr_dev->phys = "isa0061/input0";
  81         pcspkr_dev->id.bustype = BUS_ISA;
  82         pcspkr_dev->id.vendor = 0x001f;
  83         pcspkr_dev->id.product = 0x0001;
  84         pcspkr_dev->id.version = 0x0100;
  85         pcspkr_dev->dev.parent = &dev->dev;
  86
  87         pcspkr_dev->evbit[0] = BIT_MASK(EV_SND);
  88         pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
  89         pcspkr_dev->event = pcspkr_event;
  90
  91         err = input_register_device(pcspkr_dev);
  92         if (err) {
  93                 input_free_device(pcspkr_dev);
  94                 return err;
  95         }
  96
  97         platform_set_drvdata(dev, pcspkr_dev);
  98
  99         return 0;
 100 }
 101
 102 static int pcspkr_remove(struct platform_device *dev)
 103 {
 104         struct input_dev *pcspkr_dev = platform_get_drvdata(dev);
 105
 106         input_unregister_device(pcspkr_dev);
 107         /* turn off the speaker */
 108         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 109
 110         return 0;
 111 }
 112
 113 static int pcspkr_suspend(struct device *dev)
 114 {
 115         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 116
 117         return 0;
 118 }
 119
 120 static void pcspkr_shutdown(struct platform_device *dev)
 121 {
 122         /* turn off the speaker */
 123         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 124 }
 125
 126 static const struct dev_pm_ops pcspkr_pm_ops = {
 127         .suspend = pcspkr_suspend,
 128 };
 129
 130 static struct platform_driver pcspkr_platform_driver = {
 131         .driver         = {
 132                 .name   = "pcspkr",
 133                 .pm     = &pcspkr_pm_ops,
 134         },
 135         .probe          = pcspkr_probe,
 136         .remove         = pcspkr_remove,
 137         .shutdown       = pcspkr_shutdown,
 138 };
 139 module_platform_driver(pcspkr_platform_driver);
 140