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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 
 24 MODULE_AUTHOR("Richard Zidlicky <rz@linux-m68k.org>");
 25 MODULE_DESCRIPTION("m68k beeper driver");
 26 MODULE_LICENSE("GPL");
 27 
 28 static struct platform_device *m68kspkr_platform_device;
 29 
 30 static 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 
 51 static int 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 
 83 static int 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         /* turn off the speaker */
 89         m68kspkr_event(NULL, EV_SND, SND_BELL, 0);
 90 
 91         return 0;
 92 }
 93 
 94 static void m68kspkr_shutdown(struct platform_device *dev)
 95 {
 96         /* turn off the speaker */
 97         m68kspkr_event(NULL, EV_SND, SND_BELL, 0);
 98 }
 99 
100 static struct platform_driver m68kspkr_platform_driver = {
101         .driver         = {
102                 .name   = "m68kspkr",
103                 .owner  = THIS_MODULE,
104         },
105         .probe          = m68kspkr_probe,
106         .remove         = m68kspkr_remove,
107         .shutdown       = m68kspkr_shutdown,
108 };
109 
110 static int __init m68kspkr_init(void)
111 {
112         int err;
113 
114         if (!mach_beep) {
115                 printk(KERN_INFO "m68kspkr: no lowlevel beep support\n");
116                 return -ENODEV;
117         }
118 
119         err = platform_driver_register(&m68kspkr_platform_driver);
120         if (err)
121                 return err;
122 
123         m68kspkr_platform_device = platform_device_alloc("m68kspkr", -1);
124         if (!m68kspkr_platform_device) {
125                 err = -ENOMEM;
126                 goto err_unregister_driver;
127         }
128 
129         err = platform_device_add(m68kspkr_platform_device);
130         if (err)
131                 goto err_free_device;
132 
133         return 0;
134 
135  err_free_device:
136         platform_device_put(m68kspkr_platform_device);
137  err_unregister_driver:
138         platform_driver_unregister(&m68kspkr_platform_driver);
139 
140         return err;
141 }
142 
143 static void __exit m68kspkr_exit(void)
144 {
145         platform_device_unregister(m68kspkr_platform_device);
146         platform_driver_unregister(&m68kspkr_platform_driver);
147 }
148 
149 module_init(m68kspkr_init);
150 module_exit(m68kspkr_exit);
151 

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