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