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 MODULE_ALIAS("platform:pcspkr"); 26 27 #ifdef CONFIG_X86 28 /* Use the global PIT lock ! */ 29 #include <asm/i8253.h> 30 #else 31 #include <asm/8253pit.h> 32 static DEFINE_SPINLOCK(i8253_lock); 33 #endif 34 35 static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 36 { 37 unsigned int count = 0; 38 unsigned long flags; 39 40 if (type != EV_SND) 41 return -1; 42 43 switch (code) { 44 case SND_BELL: if (value) value = 1000; 45 case SND_TONE: break; 46 default: return -1; 47 } 48 49 if (value > 20 && value < 32767) 50 count = PIT_TICK_RATE / value; 51 52 spin_lock_irqsave(&i8253_lock, flags); 53 54 if (count) { 55 /* enable counter 2 */ 56 outb_p(inb_p(0x61) | 3, 0x61); 57 /* set command for counter 2, 2 byte write */ 58 outb_p(0xB6, 0x43); 59 /* select desired HZ */ 60 outb_p(count & 0xff, 0x42); 61 outb((count >> 8) & 0xff, 0x42); 62 } else { 63 /* disable counter 2 */ 64 outb(inb_p(0x61) & 0xFC, 0x61); 65 } 66 67 spin_unlock_irqrestore(&i8253_lock, flags); 68 69 return 0; 70 } 71 72 static int __devinit pcspkr_probe(struct platform_device *dev) 73 { 74 struct input_dev *pcspkr_dev; 75 int err; 76 77 pcspkr_dev = input_allocate_device(); 78 if (!pcspkr_dev) 79 return -ENOMEM; 80 81 pcspkr_dev->name = "PC Speaker"; 82 pcspkr_dev->phys = "isa0061/input0"; 83 pcspkr_dev->id.bustype = BUS_ISA; 84 pcspkr_dev->id.vendor = 0x001f; 85 pcspkr_dev->id.product = 0x0001; 86 pcspkr_dev->id.version = 0x0100; 87 pcspkr_dev->dev.parent = &dev->dev; 88 89 pcspkr_dev->evbit[0] = BIT_MASK(EV_SND); 90 pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); 91 pcspkr_dev->event = pcspkr_event; 92 93 err = input_register_device(pcspkr_dev); 94 if (err) { 95 input_free_device(pcspkr_dev); 96 return err; 97 } 98 99 platform_set_drvdata(dev, pcspkr_dev); 100 101 return 0; 102 } 103 104 static int __devexit pcspkr_remove(struct platform_device *dev) 105 { 106 struct input_dev *pcspkr_dev = platform_get_drvdata(dev); 107 108 input_unregister_device(pcspkr_dev); 109 platform_set_drvdata(dev, NULL); 110 /* turn off the speaker */ 111 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 112 113 return 0; 114 } 115 116 static int pcspkr_suspend(struct platform_device *dev, pm_message_t state) 117 { 118 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 119 120 return 0; 121 } 122 123 static void pcspkr_shutdown(struct platform_device *dev) 124 { 125 /* turn off the speaker */ 126 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 127 } 128 129 static struct platform_driver pcspkr_platform_driver = { 130 .driver = { 131 .name = "pcspkr", 132 .owner = THIS_MODULE, 133 }, 134 .probe = pcspkr_probe, 135 .remove = __devexit_p(pcspkr_remove), 136 .suspend = pcspkr_suspend, 137 .shutdown = pcspkr_shutdown, 138 }; 139 140 141 static int __init pcspkr_init(void) 142 { 143 return platform_driver_register(&pcspkr_platform_driver); 144 } 145 146 static void __exit pcspkr_exit(void) 147 { 148 platform_driver_unregister(&pcspkr_platform_driver); 149 } 150 151 module_init(pcspkr_init); 152 module_exit(pcspkr_exit); 153