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