104 строки
1.9 KiB
C
104 строки
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* PC Speaker beeper driver for Linux
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*
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* Copyright (c) 2002 Vojtech Pavlik
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* Copyright (c) 1992 Orest Zborowski
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*/
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/io.h>
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#include "pcsp.h"
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#include "pcsp_input.h"
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static void pcspkr_do_sound(unsigned int count)
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{
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unsigned long flags;
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raw_spin_lock_irqsave(&i8253_lock, flags);
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if (count) {
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/* set command for counter 2, 2 byte write */
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outb_p(0xB6, 0x43);
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/* select desired HZ */
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outb_p(count & 0xff, 0x42);
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outb((count >> 8) & 0xff, 0x42);
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/* enable counter 2 */
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outb_p(inb_p(0x61) | 3, 0x61);
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} else {
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/* disable counter 2 */
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outb(inb_p(0x61) & 0xFC, 0x61);
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}
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raw_spin_unlock_irqrestore(&i8253_lock, flags);
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}
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void pcspkr_stop_sound(void)
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{
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pcspkr_do_sound(0);
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}
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static int pcspkr_input_event(struct input_dev *dev, unsigned int type,
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unsigned int code, int value)
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{
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unsigned int count = 0;
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if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr)
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return 0;
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switch (type) {
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case EV_SND:
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switch (code) {
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case SND_BELL:
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if (value)
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value = 1000;
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break;
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case SND_TONE:
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break;
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default:
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return -1;
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}
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break;
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default:
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return -1;
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}
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if (value > 20 && value < 32767)
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count = PIT_TICK_RATE / value;
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pcspkr_do_sound(count);
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return 0;
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}
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int pcspkr_input_init(struct input_dev **rdev, struct device *dev)
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{
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int err;
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struct input_dev *input_dev = devm_input_allocate_device(dev);
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if (!input_dev)
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return -ENOMEM;
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input_dev->name = "PC Speaker";
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input_dev->phys = "isa0061/input0";
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input_dev->id.bustype = BUS_ISA;
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input_dev->id.vendor = 0x001f;
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input_dev->id.product = 0x0001;
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input_dev->id.version = 0x0100;
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input_dev->dev.parent = dev;
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input_dev->evbit[0] = BIT(EV_SND);
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input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
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input_dev->event = pcspkr_input_event;
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err = input_register_device(input_dev);
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if (err)
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return err;
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*rdev = input_dev;
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return 0;
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}
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