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