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/init.h>
  18 #include <linux/input.h>
  19 #include <linux/platform_device.h>
  20 #include <asm/8253pit.h>
  21 #include <asm/io.h>
  22
  23 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  24 MODULE_DESCRIPTION("PC Speaker beeper driver");
  25 MODULE_LICENSE("GPL");
  26
  27 #ifdef CONFIG_X86
  28 /* Use the global PIT lock ! */
  29 #include <asm/i8253.h>
  30 #else
  31 static DEFINE_SPINLOCK(i8253_lock);
  32 #endif
  33
  34 static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  35 {
  36         unsigned int count = 0;
  37         unsigned long flags;
  38
  39         if (type != EV_SND)
  40                 return -1;
  41
  42         switch (code) {
  43                 case SND_BELL: if (value) value = 1000;
  44                 case SND_TONE: break;
  45                 default: return -1;
  46         }
  47
  48         if (value > 20 && value < 32767)
  49                 count = PIT_TICK_RATE / value;
  50
  51         spin_lock_irqsave(&i8253_lock, flags);
  52
  53         if (count) {
  54                 /* enable counter 2 */
  55                 outb_p(inb_p(0x61) | 3, 0x61);
  56                 /* set command for counter 2, 2 byte write */
  57                 outb_p(0xB6, 0x43);
  58                 /* select desired HZ */
  59                 outb_p(count & 0xff, 0x42);
  60                 outb((count >> 8) & 0xff, 0x42);
  61         } else {
  62                 /* disable counter 2 */
  63                 outb(inb_p(0x61) & 0xFC, 0x61);
  64         }
  65
  66         spin_unlock_irqrestore(&i8253_lock, flags);
  67
  68         return 0;
  69 }
  70
  71 static int __devinit pcspkr_probe(struct platform_device *dev)
  72 {
  73         struct input_dev *pcspkr_dev;
  74         int err;
  75
  76         pcspkr_dev = input_allocate_device();
  77         if (!pcspkr_dev)
  78                 return -ENOMEM;
  79
  80         pcspkr_dev->name = "PC Speaker";
  81         pcspkr_dev->phys = "isa0061/input0";
  82         pcspkr_dev->id.bustype = BUS_ISA;
  83         pcspkr_dev->id.vendor = 0x001f;
  84         pcspkr_dev->id.product = 0x0001;
  85         pcspkr_dev->id.version = 0x0100;
  86         pcspkr_dev->dev.parent = &dev->dev;
  87
  88         pcspkr_dev->evbit[0] = BIT(EV_SND);
  89         pcspkr_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
  90         pcspkr_dev->event = pcspkr_event;
  91
  92         err = input_register_device(pcspkr_dev);
  93         if (err) {
  94                 input_free_device(pcspkr_dev);
  95                 return err;
  96         }
  97
  98         platform_set_drvdata(dev, pcspkr_dev);
  99
 100         return 0;
 101 }
 102
 103 static int __devexit pcspkr_remove(struct platform_device *dev)
 104 {
 105         struct input_dev *pcspkr_dev = platform_get_drvdata(dev);
 106
 107         input_unregister_device(pcspkr_dev);
 108         platform_set_drvdata(dev, NULL);
 109         /* turn off the speaker */
 110         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 111
 112         return 0;
 113 }
 114
 115 static int pcspkr_suspend(struct platform_device *dev, pm_message_t state)
 116 {
 117         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 118
 119         return 0;
 120 }
 121
 122 static void pcspkr_shutdown(struct platform_device *dev)
 123 {
 124         /* turn off the speaker */
 125         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 126 }
 127
 128 static struct platform_driver pcspkr_platform_driver = {
 129         .driver         = {
 130                 .name   = "pcspkr",
 131                 .owner  = THIS_MODULE,
 132         },
 133         .probe          = pcspkr_probe,
 134         .remove         = __devexit_p(pcspkr_remove),
 135         .suspend        = pcspkr_suspend,
 136         .shutdown       = pcspkr_shutdown,
 137 };
 138
 139
 140 static int __init pcspkr_init(void)
 141 {
 142         return platform_driver_register(&pcspkr_platform_driver);
 143 }
 144
 145 static void __exit pcspkr_exit(void)
 146 {
 147         platform_driver_unregister(&pcspkr_platform_driver);
 148 }
 149
 150 module_init(pcspkr_init);
 151 module_exit(pcspkr_exit);