LXR linux/drivers/input/misc/m68kspkr.c

   1/*
   2 *  m68k beeper driver for Linux
   3 *
   4 *  Copyright (c) 2002 Richard Zidlicky
   5 *  Copyright (c) 2002 Vojtech Pavlik
   6 *  Copyright (c) 1992 Orest Zborowski
   7 *
   8 */
   9
  10/*
  11 * This program is free software; you can redistribute it and/or modify it
  12 * under the terms of the GNU General Public License version 2 as published by
  13 * the Free Software Foundation
  14 */
  15
  16#include <linux/kernel.h>
  17#include <linux/module.h>
  18#include <linux/init.h>
  19#include <linux/input.h>
  20#include <linux/platform_device.h>
  21#include <asm/machdep.h>
  22#include <asm/io.h>
  23
  24MODULE_AUTHOR("Richard Zidlicky <rz@linux-m68k.org>");
  25MODULE_DESCRIPTION("m68k beeper driver");
  26MODULE_LICENSE("GPL");
  27
  28static struct platform_device *m68kspkr_platform_device;
  29
  30static int m68kspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  31{
  32        unsigned int count = 0;
  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 = 1193182 / value;
  45
  46        mach_beep(count, -1);
  47
  48        return 0;
  49}
  50
  51static int __devinit m68kspkr_probe(struct platform_device *dev)
  52{
  53        struct input_dev *input_dev;
  54        int err;
  55
  56        input_dev = input_allocate_device();
  57        if (!input_dev)
  58                return -ENOMEM;
  59
  60        input_dev->name = "m68k beeper";
  61        input_dev->phys = "m68k/generic";
  62        input_dev->id.bustype = BUS_HOST;
  63        input_dev->id.vendor  = 0x001f;
  64        input_dev->id.product = 0x0001;
  65        input_dev->id.version = 0x0100;
  66        input_dev->dev.parent = &dev->dev;
  67
  68        input_dev->evbit[0] = BIT_MASK(EV_SND);
  69        input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
  70        input_dev->event = m68kspkr_event;
  71
  72        err = input_register_device(input_dev);
  73        if (err) {
  74                input_free_device(input_dev);
  75                return err;
  76        }
  77
  78        platform_set_drvdata(dev, input_dev);
  79
  80        return 0;
  81}
  82
  83static int __devexit m68kspkr_remove(struct platform_device *dev)
  84{
  85        struct input_dev *input_dev = platform_get_drvdata(dev);
  86
  87        input_unregister_device(input_dev);
  88        platform_set_drvdata(dev, NULL);
  89        /* turn off the speaker */
  90        m68kspkr_event(NULL, EV_SND, SND_BELL, 0);
  91
  92        return 0;
  93}
  94
  95static void m68kspkr_shutdown(struct platform_device *dev)
  96{
  97        /* turn off the speaker */
  98        m68kspkr_event(NULL, EV_SND, SND_BELL, 0);
  99}
 100
 101static struct platform_driver m68kspkr_platform_driver = {
 102        .driver         = {
 103                .name   = "m68kspkr",
 104                .owner  = THIS_MODULE,
 105        },
 106        .probe          = m68kspkr_probe,
 107        .remove         = __devexit_p(m68kspkr_remove),
 108        .shutdown       = m68kspkr_shutdown,
 109};
 110
 111static int __init m68kspkr_init(void)
 112{
 113        int err;
 114
 115        if (!mach_beep) {
 116                printk(KERN_INFO "m68kspkr: no lowlevel beep support\n");
 117                return -ENODEV;
 118        }
 119
 120        err = platform_driver_register(&m68kspkr_platform_driver);
 121        if (err)
 122                return err;
 123
 124        m68kspkr_platform_device = platform_device_alloc("m68kspkr", -1);
 125        if (!m68kspkr_platform_device) {
 126                err = -ENOMEM;
 127                goto err_unregister_driver;
 128        }
 129
 130        err = platform_device_add(m68kspkr_platform_device);
 131        if (err)
 132                goto err_free_device;
 133
 134        return 0;
 135
 136 err_free_device:
 137        platform_device_put(m68kspkr_platform_device);
 138 err_unregister_driver:
 139        platform_driver_unregister(&m68kspkr_platform_driver);
 140
 141        return err;
 142}
 143
 144static void __exit m68kspkr_exit(void)
 145{
 146        platform_device_unregister(m68kspkr_platform_device);
 147        platform_driver_unregister(&m68kspkr_platform_driver);
 148}
 149
 150module_init(m68kspkr_init);
 151module_exit(m68kspkr_exit);
 152