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/i8253.h> 18 #include <linux/input.h> 19 #include <linux/platform_device.h> 20 #include <linux/timex.h> 21 #include <linux/io.h> 22 23 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 24 MODULE_DESCRIPTION("PC Speaker beeper driver"); 25 MODULE_LICENSE("GPL"); 26 MODULE_ALIAS("platform:pcspkr"); 27 28 static int pcspkr_event(struct input_dev *dev, unsigned int type, 29 unsigned int code, int value) 30 { 31 unsigned int count = 0; 32 unsigned long flags; 33 34 if (type != EV_SND) 35 return -EINVAL; 36 37 switch (code) { 38 case SND_BELL: 39 if (value) 40 value = 1000; 41 case SND_TONE: 42 break; 43 default: 44 return -EINVAL; 45 } 46 47 if (value > 20 && value < 32767) 48 count = PIT_TICK_RATE / value; 49 50 raw_spin_lock_irqsave(&i8253_lock, flags); 51 52 if (count) { 53 /* set command for counter 2, 2 byte write */ 54 outb_p(0xB6, 0x43); 55 /* select desired HZ */ 56 outb_p(count & 0xff, 0x42); 57 outb((count >> 8) & 0xff, 0x42); 58 /* enable counter 2 */ 59 outb_p(inb_p(0x61) | 3, 0x61); 60 } else { 61 /* disable counter 2 */ 62 outb(inb_p(0x61) & 0xFC, 0x61); 63 } 64 65 raw_spin_unlock_irqrestore(&i8253_lock, flags); 66 67 return 0; 68 } 69 70 static int pcspkr_probe(struct platform_device *dev) 71 { 72 struct input_dev *pcspkr_dev; 73 int err; 74 75 pcspkr_dev = input_allocate_device(); 76 if (!pcspkr_dev) 77 return -ENOMEM; 78 79 pcspkr_dev->name = "PC Speaker"; 80 pcspkr_dev->phys = "isa0061/input0"; 81 pcspkr_dev->id.bustype = BUS_ISA; 82 pcspkr_dev->id.vendor = 0x001f; 83 pcspkr_dev->id.product = 0x0001; 84 pcspkr_dev->id.version = 0x0100; 85 pcspkr_dev->dev.parent = &dev->dev; 86 87 pcspkr_dev->evbit[0] = BIT_MASK(EV_SND); 88 pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); 89 pcspkr_dev->event = pcspkr_event; 90 91 err = input_register_device(pcspkr_dev); 92 if (err) { 93 input_free_device(pcspkr_dev); 94 return err; 95 } 96 97 platform_set_drvdata(dev, pcspkr_dev); 98 99 return 0; 100 } 101 102 static int pcspkr_remove(struct platform_device *dev) 103 { 104 struct input_dev *pcspkr_dev = platform_get_drvdata(dev); 105 106 input_unregister_device(pcspkr_dev); 107 /* turn off the speaker */ 108 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 109 110 return 0; 111 } 112 113 static int pcspkr_suspend(struct device *dev) 114 { 115 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 116 117 return 0; 118 } 119 120 static void pcspkr_shutdown(struct platform_device *dev) 121 { 122 /* turn off the speaker */ 123 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 124 } 125 126 static const struct dev_pm_ops pcspkr_pm_ops = { 127 .suspend = pcspkr_suspend, 128 }; 129 130 static struct platform_driver pcspkr_platform_driver = { 131 .driver = { 132 .name = "pcspkr", 133 .pm = &pcspkr_pm_ops, 134 }, 135 .probe = pcspkr_probe, 136 .remove = pcspkr_remove, 137 .shutdown = pcspkr_shutdown, 138 }; 139 module_platform_driver(pcspkr_platform_driver); 140 141