Stas Sergeev | 9ab4d07 | 2008-03-03 10:53:54 +0100 | [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/init.h> |
| 16 | #include <linux/input.h> |
| 17 | #include <asm/io.h> |
| 18 | #include "pcsp.h" |
| 19 | |
| 20 | static void pcspkr_do_sound(unsigned int count) |
| 21 | { |
| 22 | unsigned long flags; |
| 23 | |
| 24 | spin_lock_irqsave(&i8253_lock, flags); |
| 25 | |
| 26 | if (count) { |
Stas Sergeev | 9ab4d07 | 2008-03-03 10:53:54 +0100 | [diff] [blame] | 27 | /* set command for counter 2, 2 byte write */ |
| 28 | outb_p(0xB6, 0x43); |
| 29 | /* select desired HZ */ |
| 30 | outb_p(count & 0xff, 0x42); |
| 31 | outb((count >> 8) & 0xff, 0x42); |
Zoltan Devai | b02555c | 2008-11-03 00:30:28 +0100 | [diff] [blame] | 32 | /* enable counter 2 */ |
| 33 | outb_p(inb_p(0x61) | 3, 0x61); |
Stas Sergeev | 9ab4d07 | 2008-03-03 10:53:54 +0100 | [diff] [blame] | 34 | } else { |
| 35 | /* disable counter 2 */ |
| 36 | outb(inb_p(0x61) & 0xFC, 0x61); |
| 37 | } |
| 38 | |
| 39 | spin_unlock_irqrestore(&i8253_lock, flags); |
| 40 | } |
| 41 | |
| 42 | void pcspkr_stop_sound(void) |
| 43 | { |
| 44 | pcspkr_do_sound(0); |
| 45 | } |
| 46 | |
| 47 | static int pcspkr_input_event(struct input_dev *dev, unsigned int type, |
| 48 | unsigned int code, int value) |
| 49 | { |
| 50 | unsigned int count = 0; |
| 51 | |
| 52 | if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr) |
| 53 | return 0; |
| 54 | |
| 55 | switch (type) { |
| 56 | case EV_SND: |
| 57 | switch (code) { |
| 58 | case SND_BELL: |
| 59 | if (value) |
| 60 | value = 1000; |
| 61 | case SND_TONE: |
| 62 | break; |
| 63 | default: |
| 64 | return -1; |
| 65 | } |
| 66 | break; |
| 67 | |
| 68 | default: |
| 69 | return -1; |
| 70 | } |
| 71 | |
| 72 | if (value > 20 && value < 32767) |
| 73 | count = PIT_TICK_RATE / value; |
| 74 | |
| 75 | pcspkr_do_sound(count); |
| 76 | |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | int __devinit pcspkr_input_init(struct input_dev **rdev, struct device *dev) |
| 81 | { |
| 82 | int err; |
| 83 | |
| 84 | struct input_dev *input_dev = input_allocate_device(); |
| 85 | if (!input_dev) |
| 86 | return -ENOMEM; |
| 87 | |
| 88 | input_dev->name = "PC Speaker"; |
| 89 | input_dev->phys = "isa0061/input0"; |
| 90 | input_dev->id.bustype = BUS_ISA; |
| 91 | input_dev->id.vendor = 0x001f; |
| 92 | input_dev->id.product = 0x0001; |
| 93 | input_dev->id.version = 0x0100; |
| 94 | input_dev->dev.parent = dev; |
| 95 | |
| 96 | input_dev->evbit[0] = BIT(EV_SND); |
| 97 | input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); |
| 98 | input_dev->event = pcspkr_input_event; |
| 99 | |
| 100 | err = input_register_device(input_dev); |
| 101 | if (err) { |
| 102 | input_free_device(input_dev); |
| 103 | return err; |
| 104 | } |
| 105 | |
| 106 | *rdev = input_dev; |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | int pcspkr_input_remove(struct input_dev *dev) |
| 111 | { |
| 112 | pcspkr_stop_sound(); |
| 113 | input_unregister_device(dev); /* this also does kfree() */ |
| 114 | |
| 115 | return 0; |
| 116 | } |