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
  19 MODULE_AUTHOR("Richard Zidlicky <rz@linux-m68k.org>");
  20 MODULE_DESCRIPTION("m68k beeper driver");
  21 MODULE_LICENSE("GPL");
  22
  23 static struct platform_device *m68kspkr_platform_device;
  24
  25 static 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
  46 static 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
  78 static 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
  89 static void m68kspkr_shutdown(struct platform_device *dev)
  90 {
  91         /* turn off the speaker */
  92         m68kspkr_event(NULL, EV_SND, SND_BELL, 0);
  93 }
  94
  95 static 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
 104 static 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
 137 static void __exit m68kspkr_exit(void)
 138 {
 139         platform_device_unregister(m68kspkr_platform_device);
 140         platform_driver_unregister(&m68kspkr_platform_driver);
 141 }
 142
 143 module_init(m68kspkr_init);
 144 module_exit(m68kspkr_exit);