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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  m68k beeper driver for Linux
   4 *
   5 *  Copyright (c) 2002 Richard Zidlicky
   6 *  Copyright (c) 2002 Vojtech Pavlik
   7 *  Copyright (c) 1992 Orest Zborowski
   8 */
   9
  10
  11#include <linux/kernel.h>
  12#include <linux/module.h>
  13#include <linux/init.h>
  14#include <linux/input.h>
  15#include <linux/platform_device.h>
  16#include <asm/machdep.h>
  17#include <asm/io.h>
  18
  19MODULE_AUTHOR("Richard Zidlicky <rz@linux-m68k.org>");
  20MODULE_DESCRIPTION("m68k beeper driver");
  21MODULE_LICENSE("GPL");
  22
  23static struct platform_device *m68kspkr_platform_device;
  24
  25static int m68kspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  26{
  27        unsigned int count = 0;
  28
  29        if (type != EV_SND)
  30                return -1;
  31
  32        switch (code) {
  33                case SND_BELL: if (value) value = 1000;
  34                case SND_TONE: break;
  35                default: return -1;
  36        }
  37
  38        if (value > 20 && value < 32767)
  39                count = 1193182 / value;
  40
  41        mach_beep(count, -1);
  42
  43        return 0;
  44}
  45
  46static int m68kspkr_probe(struct platform_device *dev)
  47{
  48        struct input_dev *input_dev;
  49        int err;
  50
  51        input_dev = input_allocate_device();
  52        if (!input_dev)
  53                return -ENOMEM;
  54
  55        input_dev->name = "m68k beeper";
  56        input_dev->phys = "m68k/generic";
  57        input_dev->id.bustype = BUS_HOST;
  58        input_dev->id.vendor  = 0x001f;
  59        input_dev->id.product = 0x0001;
  60        input_dev->id.version = 0x0100;
  61        input_dev->dev.parent = &dev->dev;
  62
  63        input_dev->evbit[0] = BIT_MASK(EV_SND);
  64        input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
  65        input_dev->event = m68kspkr_event;
  66
  67        err = input_register_device(input_dev);
  68        if (err) {
  69                input_free_device(input_dev);
  70                return err;
  71        }
  72
  73        platform_set_drvdata(dev, input_dev);
  74
  75        return 0;
  76}
  77
  78static int m68kspkr_remove(struct platform_device *dev)
  79{
  80        struct input_dev *input_dev = platform_get_drvdata(dev);
  81
  82        input_unregister_device(input_dev);
  83        /* turn off the speaker */
  84        m68kspkr_event(NULL, EV_SND, SND_BELL, 0);
  85
  86        return 0;
  87}
  88
  89static void m68kspkr_shutdown(struct platform_device *dev)
  90{
  91        /* turn off the speaker */
  92        m68kspkr_event(NULL, EV_SND, SND_BELL, 0);
  93}
  94
  95static struct platform_driver m68kspkr_platform_driver = {
  96        .driver         = {
  97                .name   = "m68kspkr",
  98        },
  99        .probe          = m68kspkr_probe,
 100        .remove         = m68kspkr_remove,
 101        .shutdown       = m68kspkr_shutdown,
 102};
 103
 104static int __init m68kspkr_init(void)
 105{
 106        int err;
 107
 108        if (!mach_beep) {
 109                printk(KERN_INFO "m68kspkr: no lowlevel beep support\n");
 110                return -ENODEV;
 111        }
 112
 113        err = platform_driver_register(&m68kspkr_platform_driver);
 114        if (err)
 115                return err;
 116
 117        m68kspkr_platform_device = platform_device_alloc("m68kspkr", -1);
 118        if (!m68kspkr_platform_device) {
 119                err = -ENOMEM;
 120                goto err_unregister_driver;
 121        }
 122
 123        err = platform_device_add(m68kspkr_platform_device);
 124        if (err)
 125                goto err_free_device;
 126
 127        return 0;
 128
 129 err_free_device:
 130        platform_device_put(m68kspkr_platform_device);
 131 err_unregister_driver:
 132        platform_driver_unregister(&m68kspkr_platform_driver);
 133
 134        return err;
 135}
 136
 137static void __exit m68kspkr_exit(void)
 138{
 139        platform_device_unregister(m68kspkr_platform_device);
 140        platform_driver_unregister(&m68kspkr_platform_driver);
 141}
 142
 143module_init(m68kspkr_init);
 144module_exit(m68kspkr_exit);
 145