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/io.h> 21 22 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 23 MODULE_DESCRIPTION("PC Speaker beeper driver"); 24 MODULE_LICENSE("GPL"); 25 26 #ifdef CONFIG_X86 27 /* Use the global PIT lock ! */ 28 #include <asm/i8253.h> 29 #else 30 #include <asm/8253pit.h> 31 static DEFINE_SPINLOCK(i8253_lock); 32 #endif 33 34 static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 35 { 36 unsigned int count = 0; 37 unsigned long flags; 38 39 if (type != EV_SND) 40 return -1; 41 42 switch (code) { 43 case SND_BELL: if (value) value = 1000; 44 case SND_TONE: break; 45 default: return -1; 46 } 47 48 if (value > 20 && value < 32767) 49 count = PIT_TICK_RATE / value; 50 51 spin_lock_irqsave(&i8253_lock, flags); 52 53 if (count) { 54 /* enable counter 2 */ 55 outb_p(inb_p(0x61) | 3, 0x61); 56 /* set command for counter 2, 2 byte write */ 57 outb_p(0xB6, 0x43); 58 /* select desired HZ */ 59 outb_p(count & 0xff, 0x42); 60 outb((count >> 8) & 0xff, 0x42); 61 } else { 62 /* disable counter 2 */ 63 outb(inb_p(0x61) & 0xFC, 0x61); 64 } 65 66 spin_unlock_irqrestore(&i8253_lock, flags); 67 68 return 0; 69 } 70 71 static int __devinit pcspkr_probe(struct platform_device *dev) 72 { 73 struct input_dev *pcspkr_dev; 74 int err; 75 76 pcspkr_dev = input_allocate_device(); 77 if (!pcspkr_dev) 78 return -ENOMEM; 79 80 pcspkr_dev->name = "PC Speaker"; 81 pcspkr_dev->phys = "isa0061/input0"; 82 pcspkr_dev->id.bustype = BUS_ISA; 83 pcspkr_dev->id.vendor = 0x001f; 84 pcspkr_dev->id.product = 0x0001; 85 pcspkr_dev->id.version = 0x0100; 86 pcspkr_dev->dev.parent = &dev->dev; 87 88 pcspkr_dev->evbit[0] = BIT(EV_SND); 89 pcspkr_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); 90 pcspkr_dev->event = pcspkr_event; 91 92 err = input_register_device(pcspkr_dev); 93 if (err) { 94 input_free_device(pcspkr_dev); 95 return err; 96 } 97 98 platform_set_drvdata(dev, pcspkr_dev); 99 100 return 0; 101 } 102 103 static int __devexit pcspkr_remove(struct platform_device *dev) 104 { 105 struct input_dev *pcspkr_dev = platform_get_drvdata(dev); 106 107 input_unregister_device(pcspkr_dev); 108 platform_set_drvdata(dev, NULL); 109 /* turn off the speaker */ 110 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 111 112 return 0; 113 } 114 115 static int pcspkr_suspend(struct platform_device *dev, pm_message_t state) 116 { 117 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 118 119 return 0; 120 } 121 122 static void pcspkr_shutdown(struct platform_device *dev) 123 { 124 /* turn off the speaker */ 125 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 126 } 127 128 static struct platform_driver pcspkr_platform_driver = { 129 .driver = { 130 .name = "pcspkr", 131 .owner = THIS_MODULE, 132 }, 133 .probe = pcspkr_probe, 134 .remove = __devexit_p(pcspkr_remove), 135 .suspend = pcspkr_suspend, 136 .shutdown = pcspkr_shutdown, 137 }; 138 139 140 static int __init pcspkr_init(void) 141 { 142 return platform_driver_register(&pcspkr_platform_driver); 143 } 144 145 static void __exit pcspkr_exit(void) 146 { 147 platform_driver_unregister(&pcspkr_platform_driver); 148 } 149 150 module_init(pcspkr_init); 151 module_exit(pcspkr_exit); 152