| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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/i8253.h> |
| 18 | #include <linux/input.h> |
| 19 | #include <linux/platform_device.h> |
| 20 | #include <linux/timex.h> |
| 21 | #include <linux/io.h> |
| 22 | |
| 23 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
| 24 | MODULE_DESCRIPTION("PC Speaker beeper driver"); |
| 25 | MODULE_LICENSE("GPL"); |
| 26 | MODULE_ALIAS("platform:pcspkr"); |
| 27 | |
| 28 | static int pcspkr_event(struct input_dev *dev, unsigned int type, |
| 29 | unsigned int code, int value) |
| 30 | { |
| 31 | unsigned int count = 0; |
| 32 | unsigned long flags; |
| 33 | |
| 34 | if (type != EV_SND) |
| 35 | return -EINVAL; |
| 36 | |
| 37 | switch (code) { |
| 38 | case SND_BELL: |
| 39 | if (value) |
| 40 | value = 1000; |
| 41 | case SND_TONE: |
| 42 | break; |
| 43 | default: |
| 44 | return -EINVAL; |
| 45 | } |
| 46 | |
| 47 | if (value > 20 && value < 32767) |
| 48 | count = PIT_TICK_RATE / value; |
| 49 | |
| 50 | raw_spin_lock_irqsave(&i8253_lock, flags); |
| 51 | |
| 52 | if (count) { |
| 53 | /* set command for counter 2, 2 byte write */ |
| 54 | outb_p(0xB6, 0x43); |
| 55 | /* select desired HZ */ |
| 56 | outb_p(count & 0xff, 0x42); |
| 57 | outb((count >> 8) & 0xff, 0x42); |
| 58 | /* enable counter 2 */ |
| 59 | outb_p(inb_p(0x61) | 3, 0x61); |
| 60 | } else { |
| 61 | /* disable counter 2 */ |
| 62 | outb(inb_p(0x61) & 0xFC, 0x61); |
| 63 | } |
| 64 | |
| 65 | raw_spin_unlock_irqrestore(&i8253_lock, flags); |
| 66 | |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | static int pcspkr_probe(struct platform_device *dev) |
| 71 | { |
| 72 | struct input_dev *pcspkr_dev; |
| 73 | int err; |
| 74 | |
| 75 | pcspkr_dev = input_allocate_device(); |
| 76 | if (!pcspkr_dev) |
| 77 | return -ENOMEM; |
| 78 | |
| 79 | pcspkr_dev->name = "PC Speaker"; |
| 80 | pcspkr_dev->phys = "isa0061/input0"; |
| 81 | pcspkr_dev->id.bustype = BUS_ISA; |
| 82 | pcspkr_dev->id.vendor = 0x001f; |
| 83 | pcspkr_dev->id.product = 0x0001; |
| 84 | pcspkr_dev->id.version = 0x0100; |
| 85 | pcspkr_dev->dev.parent = &dev->dev; |
| 86 | |
| 87 | pcspkr_dev->evbit[0] = BIT_MASK(EV_SND); |
| 88 | pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); |
| 89 | pcspkr_dev->event = pcspkr_event; |
| 90 | |
| 91 | err = input_register_device(pcspkr_dev); |
| 92 | if (err) { |
| 93 | input_free_device(pcspkr_dev); |
| 94 | return err; |
| 95 | } |
| 96 | |
| 97 | platform_set_drvdata(dev, pcspkr_dev); |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static int pcspkr_remove(struct platform_device *dev) |
| 103 | { |
| 104 | struct input_dev *pcspkr_dev = platform_get_drvdata(dev); |
| 105 | |
| 106 | input_unregister_device(pcspkr_dev); |
| 107 | /* turn off the speaker */ |
| 108 | pcspkr_event(NULL, EV_SND, SND_BELL, 0); |
| 109 | |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | static int pcspkr_suspend(struct device *dev) |
| 114 | { |
| 115 | pcspkr_event(NULL, EV_SND, SND_BELL, 0); |
| 116 | |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | static void pcspkr_shutdown(struct platform_device *dev) |
| 121 | { |
| 122 | /* turn off the speaker */ |
| 123 | pcspkr_event(NULL, EV_SND, SND_BELL, 0); |
| 124 | } |
| 125 | |
| 126 | static const struct dev_pm_ops pcspkr_pm_ops = { |
| 127 | .suspend = pcspkr_suspend, |
| 128 | }; |
| 129 | |
| 130 | static struct platform_driver pcspkr_platform_driver = { |
| 131 | .driver = { |
| 132 | .name = "pcspkr", |
| 133 | .pm = &pcspkr_pm_ops, |
| 134 | }, |
| 135 | .probe = pcspkr_probe, |
| 136 | .remove = pcspkr_remove, |
| 137 | .shutdown = pcspkr_shutdown, |
| 138 | }; |
| 139 | module_platform_driver(pcspkr_platform_driver); |
| 140 | |