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/init.h> 18 #include <linux/input.h> 19 #include <linux/platform_device.h> 20 #include <asm/8253pit.h> 21 #include <asm/io.h> 22 23 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 24 MODULE_DESCRIPTION("PC Speaker beeper driver"); 25 MODULE_LICENSE("GPL"); 26 27 static DEFINE_SPINLOCK(i8253_beep_lock); 28 29 static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 30 { 31 unsigned int count = 0; 32 unsigned long flags; 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 = PIT_TICK_RATE / value; 45 46 spin_lock_irqsave(&i8253_beep_lock, flags); 47 48 if (count) { 49 /* enable counter 2 */ 50 outb_p(inb_p(0x61) | 3, 0x61); 51 /* set command for counter 2, 2 byte write */ 52 outb_p(0xB6, 0x43); 53 /* select desired HZ */ 54 outb_p(count & 0xff, 0x42); 55 outb((count >> 8) & 0xff, 0x42); 56 } else { 57 /* disable counter 2 */ 58 outb(inb_p(0x61) & 0xFC, 0x61); 59 } 60 61 spin_unlock_irqrestore(&i8253_beep_lock, flags); 62 63 return 0; 64 } 65 66 static int __devinit pcspkr_probe(struct platform_device *dev) 67 { 68 struct input_dev *pcspkr_dev; 69 int err; 70 71 pcspkr_dev = input_allocate_device(); 72 if (!pcspkr_dev) 73 return -ENOMEM; 74 75 pcspkr_dev->name = "PC Speaker"; 76 pcspkr_dev->phys = "isa0061/input0"; 77 pcspkr_dev->id.bustype = BUS_ISA; 78 pcspkr_dev->id.vendor = 0x001f; 79 pcspkr_dev->id.product = 0x0001; 80 pcspkr_dev->id.version = 0x0100; 81 pcspkr_dev->dev.parent = &dev->dev; 82 83 pcspkr_dev->evbit[0] = BIT(EV_SND); 84 pcspkr_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); 85 pcspkr_dev->event = pcspkr_event; 86 87 err = input_register_device(pcspkr_dev); 88 if (err) { 89 input_free_device(pcspkr_dev); 90 return err; 91 } 92 93 platform_set_drvdata(dev, pcspkr_dev); 94 95 return 0; 96 } 97 98 static int __devexit pcspkr_remove(struct platform_device *dev) 99 { 100 struct input_dev *pcspkr_dev = platform_get_drvdata(dev); 101 102 input_unregister_device(pcspkr_dev); 103 platform_set_drvdata(dev, NULL); 104 /* turn off the speaker */ 105 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 106 107 return 0; 108 } 109 110 static int pcspkr_suspend(struct platform_device *dev, pm_message_t state) 111 { 112 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 113 114 return 0; 115 } 116 117 static void pcspkr_shutdown(struct platform_device *dev) 118 { 119 /* turn off the speaker */ 120 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 121 } 122 123 static struct platform_driver pcspkr_platform_driver = { 124 .driver = { 125 .name = "pcspkr", 126 .owner = THIS_MODULE, 127 }, 128 .probe = pcspkr_probe, 129 .remove = __devexit_p(pcspkr_remove), 130 .suspend = pcspkr_suspend, 131 .shutdown = pcspkr_shutdown, 132 }; 133 134 135 static int __init pcspkr_init(void) 136 { 137 return platform_driver_register(&pcspkr_platform_driver); 138 } 139 140 static void __exit pcspkr_exit(void) 141 { 142 platform_driver_unregister(&pcspkr_platform_driver); 143 } 144 145 module_init(pcspkr_init); 146 module_exit(pcspkr_exit); 147