1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * PC Speaker beeper driver for Linux 4 * 5 * Copyright (c) 2002 Vojtech Pavlik 6 * Copyright (c) 1992 Orest Zborowski 7 */ 8 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/i8253.h> 13 #include <linux/input.h> 14 #include <linux/platform_device.h> 15 #include <linux/timex.h> 16 #include <linux/io.h> 17 18 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 19 MODULE_DESCRIPTION("PC Speaker beeper driver"); 20 MODULE_LICENSE("GPL"); 21 MODULE_ALIAS("platform:pcspkr"); 22 23 static int pcspkr_event(struct input_dev *dev, unsigned int type, 24 unsigned int code, int value) 25 { 26 unsigned int count = 0; 27 unsigned long flags; 28 29 if (type != EV_SND) 30 return -EINVAL; 31 32 switch (code) { 33 case SND_BELL: 34 if (value) 35 value = 1000; 36 case SND_TONE: 37 break; 38 default: 39 return -EINVAL; 40 } 41 42 if (value > 20 && value < 32767) 43 count = PIT_TICK_RATE / value; 44 45 raw_spin_lock_irqsave(&i8253_lock, flags); 46 47 if (count) { 48 /* set command for counter 2, 2 byte write */ 49 outb_p(0xB6, 0x43); 50 /* select desired HZ */ 51 outb_p(count & 0xff, 0x42); 52 outb((count >> 8) & 0xff, 0x42); 53 /* enable counter 2 */ 54 outb_p(inb_p(0x61) | 3, 0x61); 55 } else { 56 /* disable counter 2 */ 57 outb(inb_p(0x61) & 0xFC, 0x61); 58 } 59 60 raw_spin_unlock_irqrestore(&i8253_lock, flags); 61 62 return 0; 63 } 64 65 static int pcspkr_probe(struct platform_device *dev) 66 { 67 struct input_dev *pcspkr_dev; 68 int err; 69 70 pcspkr_dev = input_allocate_device(); 71 if (!pcspkr_dev) 72 return -ENOMEM; 73 74 pcspkr_dev->name = "PC Speaker"; 75 pcspkr_dev->phys = "isa0061/input0"; 76 pcspkr_dev->id.bustype = BUS_ISA; 77 pcspkr_dev->id.vendor = 0x001f; 78 pcspkr_dev->id.product = 0x0001; 79 pcspkr_dev->id.version = 0x0100; 80 pcspkr_dev->dev.parent = &dev->dev; 81 82 pcspkr_dev->evbit[0] = BIT_MASK(EV_SND); 83 pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); 84 pcspkr_dev->event = pcspkr_event; 85 86 err = input_register_device(pcspkr_dev); 87 if (err) { 88 input_free_device(pcspkr_dev); 89 return err; 90 } 91 92 platform_set_drvdata(dev, pcspkr_dev); 93 94 return 0; 95 } 96 97 static int pcspkr_remove(struct platform_device *dev) 98 { 99 struct input_dev *pcspkr_dev = platform_get_drvdata(dev); 100 101 input_unregister_device(pcspkr_dev); 102 /* turn off the speaker */ 103 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 104 105 return 0; 106 } 107 108 static int pcspkr_suspend(struct device *dev) 109 { 110 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 111 112 return 0; 113 } 114 115 static void pcspkr_shutdown(struct platform_device *dev) 116 { 117 /* turn off the speaker */ 118 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 119 } 120 121 static const struct dev_pm_ops pcspkr_pm_ops = { 122 .suspend = pcspkr_suspend, 123 }; 124 125 static struct platform_driver pcspkr_platform_driver = { 126 .driver = { 127 .name = "pcspkr", 128 .pm = &pcspkr_pm_ops, 129 }, 130 .probe = pcspkr_probe, 131 .remove = pcspkr_remove, 132 .shutdown = pcspkr_shutdown, 133 }; 134 module_platform_driver(pcspkr_platform_driver); 135 136