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 static DEFINE_SPINLOCK(i8253_beep_lock);
  28
  29 static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  30 {
  31         unsigned int count = 0;
  32         unsigned long flags;
  33
  34         if (type != EV_SND)
  35                 return -1;
  36
  37         switch (code) {
  38                 case SND_BELL: if (value) value = 1000;
  39                 case SND_TONE: break;
  40                 default: return -1;
  41         }
  42
  43         if (value > 20 && value < 32767)
  44                 count = PIT_TICK_RATE / value;
  45
  46         spin_lock_irqsave(&i8253_beep_lock, flags);
  47
  48         if (count) {
  49                 /* enable counter 2 */
  50                 outb_p(inb_p(0x61) | 3, 0x61);
  51                 /* set command for counter 2, 2 byte write */
  52                 outb_p(0xB6, 0x43);
  53                 /* select desired HZ */
  54                 outb_p(count & 0xff, 0x42);
  55                 outb((count >> 8) & 0xff, 0x42);
  56         } else {
  57                 /* disable counter 2 */
  58                 outb(inb_p(0x61) & 0xFC, 0x61);
  59         }
  60
  61         spin_unlock_irqrestore(&i8253_beep_lock, flags);
  62
  63         return 0;
  64 }
  65
  66 static int __devinit pcspkr_probe(struct platform_device *dev)
  67 {
  68         struct input_dev *pcspkr_dev;
  69         int err;
  70
  71         pcspkr_dev = input_allocate_device();
  72         if (!pcspkr_dev)
  73                 return -ENOMEM;
  74
  75         pcspkr_dev->name = "PC Speaker";
  76         pcspkr_dev->phys = "isa0061/input0";
  77         pcspkr_dev->id.bustype = BUS_ISA;
  78         pcspkr_dev->id.vendor = 0x001f;
  79         pcspkr_dev->id.product = 0x0001;
  80         pcspkr_dev->id.version = 0x0100;
  81         pcspkr_dev->cdev.dev = &dev->dev;
  82
  83         pcspkr_dev->evbit[0] = BIT(EV_SND);
  84         pcspkr_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
  85         pcspkr_dev->event = pcspkr_event;
  86
  87         err = input_register_device(pcspkr_dev);
  88         if (err) {
  89                 input_free_device(pcspkr_dev);
  90                 return err;
  91         }
  92
  93         platform_set_drvdata(dev, pcspkr_dev);
  94
  95         return 0;
  96 }
  97
  98 static int __devexit pcspkr_remove(struct platform_device *dev)
  99 {
 100         struct input_dev *pcspkr_dev = platform_get_drvdata(dev);
 101
 102         input_unregister_device(pcspkr_dev);
 103         platform_set_drvdata(dev, NULL);
 104         /* turn off the speaker */
 105         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 106
 107         return 0;
 108 }
 109
 110 static int pcspkr_suspend(struct platform_device *dev, pm_message_t state)
 111 {
 112         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 113
 114         return 0;
 115 }
 116
 117 static void pcspkr_shutdown(struct platform_device *dev)
 118 {
 119         /* turn off the speaker */
 120         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 121 }
 122
 123 static struct platform_driver pcspkr_platform_driver = {
 124         .driver         = {
 125                 .name   = "pcspkr",
 126                 .owner  = THIS_MODULE,
 127         },
 128         .probe          = pcspkr_probe,
 129         .remove         = __devexit_p(pcspkr_remove),
 130         .suspend        = pcspkr_suspend,
 131         .shutdown       = pcspkr_shutdown,
 132 };
 133
 134
 135 static int __init pcspkr_init(void)
 136 {
 137         return platform_driver_register(&pcspkr_platform_driver);
 138 }
 139
 140 static void __exit pcspkr_exit(void)
 141 {
 142         platform_driver_unregister(&pcspkr_platform_driver);
 143 }
 144
 145 module_init(pcspkr_init);
 146 module_exit(pcspkr_exit);