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 break; 37 case SND_TONE: 38 break; 39 default: 40 return -EINVAL; 41 } 42 43 if (value > 20 && value < 32767) 44 count = PIT_TICK_RATE / value; 45 46 raw_spin_lock_irqsave(&i8253_lock, flags); 47 48 if (count) { 49 /* set command for counter 2, 2 byte write */ 50 outb_p(0xB6, 0x43); 51 /* select desired HZ */ 52 outb_p(count & 0xff, 0x42); 53 outb((count >> 8) & 0xff, 0x42); 54 /* enable counter 2 */ 55 outb_p(inb_p(0x61) | 3, 0x61); 56 } else { 57 /* disable counter 2 */ 58 outb(inb_p(0x61) & 0xFC, 0x61); 59 } 60 61 raw_spin_unlock_irqrestore(&i8253_lock, flags); 62 63 return 0; 64 } 65 66 static int 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_MASK(EV_SND); 84 pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(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 void 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 /* turn off the speaker */ 104 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 105 } 106 107 static int pcspkr_suspend(struct device *dev) 108 { 109 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 110 111 return 0; 112 } 113 114 static void pcspkr_shutdown(struct platform_device *dev) 115 { 116 /* turn off the speaker */ 117 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 118 } 119 120 static const struct dev_pm_ops pcspkr_pm_ops = { 121 .suspend = pcspkr_suspend, 122 }; 123 124 static struct platform_driver pcspkr_platform_driver = { 125 .driver = { 126 .name = "pcspkr", 127 .pm = &pcspkr_pm_ops, 128 }, 129 .probe = pcspkr_probe, 130 .remove_new = pcspkr_remove, 131 .shutdown = pcspkr_shutdown, 132 }; 133 module_platform_driver(pcspkr_platform_driver); 134 135