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 struct platform_device *pcspkr_platform_device;
  28 static DEFINE_SPINLOCK(i8253_beep_lock);
  29
  30 static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  31 {
  32         unsigned int count = 0;
  33         unsigned long flags;
  34
  35         if (type != EV_SND)
  36                 return -1;
  37
  38         switch (code) {
  39                 case SND_BELL: if (value) value = 1000;
  40                 case SND_TONE: break;
  41                 default: return -1;
  42         }
  43
  44         if (value > 20 && value < 32767)
  45                 count = PIT_TICK_RATE / value;
  46
  47         spin_lock_irqsave(&i8253_beep_lock, flags);
  48
  49         if (count) {
  50                 /* enable counter 2 */
  51                 outb_p(inb_p(0x61) | 3, 0x61);
  52                 /* set command for counter 2, 2 byte write */
  53                 outb_p(0xB6, 0x43);
  54                 /* select desired HZ */
  55                 outb_p(count & 0xff, 0x42);
  56                 outb((count >> 8) & 0xff, 0x42);
  57         } else {
  58                 /* disable counter 2 */
  59                 outb(inb_p(0x61) & 0xFC, 0x61);
  60         }
  61
  62         spin_unlock_irqrestore(&i8253_beep_lock, flags);
  63
  64         return 0;
  65 }
  66
  67 static int __devinit pcspkr_probe(struct platform_device *dev)
  68 {
  69         struct input_dev *pcspkr_dev;
  70         int err;
  71
  72         pcspkr_dev = input_allocate_device();
  73         if (!pcspkr_dev)
  74                 return -ENOMEM;
  75
  76         pcspkr_dev->name = "PC Speaker";
  77         pcspkr_dev->phys = "isa0061/input0";
  78         pcspkr_dev->id.bustype = BUS_ISA;
  79         pcspkr_dev->id.vendor = 0x001f;
  80         pcspkr_dev->id.product = 0x0001;
  81         pcspkr_dev->id.version = 0x0100;
  82         pcspkr_dev->cdev.dev = &dev->dev;
  83
  84         pcspkr_dev->evbit[0] = BIT(EV_SND);
  85         pcspkr_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
  86         pcspkr_dev->event = pcspkr_event;
  87
  88         err = input_register_device(pcspkr_dev);
  89         if (err) {
  90                 input_free_device(pcspkr_dev);
  91                 return err;
  92         }
  93
  94         platform_set_drvdata(dev, pcspkr_dev);
  95
  96         return 0;
  97 }
  98
  99 static int __devexit pcspkr_remove(struct platform_device *dev)
 100 {
 101         struct input_dev *pcspkr_dev = platform_get_drvdata(dev);
 102
 103         input_unregister_device(pcspkr_dev);
 104         platform_set_drvdata(dev, NULL);
 105         /* turn off the speaker */
 106         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 107
 108         return 0;
 109 }
 110
 111 static int pcspkr_suspend(struct platform_device *dev, pm_message_t state)
 112 {
 113         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 114
 115         return 0;
 116 }
 117
 118 static void pcspkr_shutdown(struct platform_device *dev)
 119 {
 120         /* turn off the speaker */
 121         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 122 }
 123
 124 static struct platform_driver pcspkr_platform_driver = {
 125         .driver         = {
 126                 .name   = "pcspkr",
 127                 .owner  = THIS_MODULE,
 128         },
 129         .probe          = pcspkr_probe,
 130         .remove         = __devexit_p(pcspkr_remove),
 131         .suspend        = pcspkr_suspend,
 132         .shutdown       = pcspkr_shutdown,
 133 };
 134
 135
 136 static int __init pcspkr_init(void)
 137 {
 138         int err;
 139
 140         err = platform_driver_register(&pcspkr_platform_driver);
 141         if (err)
 142                 return err;
 143
 144         pcspkr_platform_device = platform_device_alloc("pcspkr", -1);
 145         if (!pcspkr_platform_device) {
 146                 err = -ENOMEM;
 147                 goto err_unregister_driver;
 148         }
 149
 150         err = platform_device_add(pcspkr_platform_device);
 151         if (err)
 152                 goto err_free_device;
 153
 154         return 0;
 155
 156  err_free_device:
 157         platform_device_put(pcspkr_platform_device);
 158  err_unregister_driver:
 159         platform_driver_unregister(&pcspkr_platform_driver);
 160
 161         return err;
 162 }
 163
 164 static void __exit pcspkr_exit(void)
 165 {
 166         platform_device_unregister(pcspkr_platform_device);
 167         platform_driver_unregister(&pcspkr_platform_driver);
 168 }
 169
 170 module_init(pcspkr_init);
 171 module_exit(pcspkr_exit);