LXR linux/sound/drivers/pcsp/pcsp

   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/init.h>
  11#include <linux/input.h>
  12#include <linux/io.h>
  13#include "pcsp.h"
  14#include "pcsp_input.h"
  15
  16static void pcspkr_do_sound(unsigned int count)
  17{
  18        unsigned long flags;
  19
  20        raw_spin_lock_irqsave(&i8253_lock, flags);
  21
  22        if (count) {
  23                /* set command for counter 2, 2 byte write */
  24                outb_p(0xB6, 0x43);
  25                /* select desired HZ */
  26                outb_p(count & 0xff, 0x42);
  27                outb((count >> 8) & 0xff, 0x42);
  28                /* enable counter 2 */
  29                outb_p(inb_p(0x61) | 3, 0x61);
  30        } else {
  31                /* disable counter 2 */
  32                outb(inb_p(0x61) & 0xFC, 0x61);
  33        }
  34
  35        raw_spin_unlock_irqrestore(&i8253_lock, flags);
  36}
  37
  38void pcspkr_stop_sound(void)
  39{
  40        pcspkr_do_sound(0);
  41}
  42
  43static int pcspkr_input_event(struct input_dev *dev, unsigned int type,
  44                              unsigned int code, int value)
  45{
  46        unsigned int count = 0;
  47
  48        if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr)
  49                return 0;
  50
  51        switch (type) {
  52        case EV_SND:
  53                switch (code) {
  54                case SND_BELL:
  55                        if (value)
  56                                value = 1000;
  57                case SND_TONE:
  58                        break;
  59                default:
  60                        return -1;
  61                }
  62                break;
  63
  64        default:
  65                return -1;
  66        }
  67
  68        if (value > 20 && value < 32767)
  69                count = PIT_TICK_RATE / value;
  70
  71        pcspkr_do_sound(count);
  72
  73        return 0;
  74}
  75
  76int pcspkr_input_init(struct input_dev **rdev, struct device *dev)
  77{
  78        int err;
  79
  80        struct input_dev *input_dev = input_allocate_device();
  81        if (!input_dev)
  82                return -ENOMEM;
  83
  84        input_dev->name = "PC Speaker";
  85        input_dev->phys = "isa0061/input0";
  86        input_dev->id.bustype = BUS_ISA;
  87        input_dev->id.vendor = 0x001f;
  88        input_dev->id.product = 0x0001;
  89        input_dev->id.version = 0x0100;
  90        input_dev->dev.parent = dev;
  91
  92        input_dev->evbit[0] = BIT(EV_SND);
  93        input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
  94        input_dev->event = pcspkr_input_event;
  95
  96        err = input_register_device(input_dev);
  97        if (err) {
  98                input_free_device(input_dev);
  99                return err;
 100        }
 101
 102        *rdev = input_dev;
 103        return 0;
 104}
 105
 106int pcspkr_input_remove(struct input_dev *dev)
 107{
 108        pcspkr_stop_sound();
 109        input_unregister_device(dev);   /* this also does kfree() */
 110
 111        return 0;
 112}
 113