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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2024 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/kd.h>
#include "log.h"
#include "beep.h"
#include "system_linux.h"
#define BEEP_DEVICE_PATH "/dev/tty0"
#define TICKS_PER_SECOND 1193180
static int beepDevice = INVALID_FILE_DESCRIPTOR;
static inline BeepFrequency
getTicksPerWave (BeepFrequency frequency) {
return frequency? (TICKS_PER_SECOND / frequency): 0;
}
int
canBeep (void) {
if (beepDevice == INVALID_FILE_DESCRIPTOR) {
const char *path = BEEP_DEVICE_PATH;
int device = open(path, O_WRONLY);
if (device == -1) {
logMessage(LOG_WARNING, "can't open beep device: %s: %s", path, strerror(errno));
return 0;
}
beepDevice = device;
installSpeakerModule();
}
return 1;
}
int
synchronousBeep (BeepFrequency frequency, BeepDuration duration) {
return 0;
}
int
asynchronousBeep (BeepFrequency frequency, BeepDuration duration) {
if (beepDevice != INVALID_FILE_DESCRIPTOR) {
if (ioctl(beepDevice, KDMKTONE, ((duration << 0X10) | getTicksPerWave(frequency))) != -1) return 1;
logSystemError("ioctl[KDMKTONE]");
}
return 0;
}
int
startBeep (BeepFrequency frequency) {
if (beepDevice != INVALID_FILE_DESCRIPTOR) {
if (ioctl(beepDevice, KIOCSOUND, getTicksPerWave(frequency)) != -1) return 1;
logSystemError("ioctl[KIOCSOUND]");
}
return 0;
}
int
stopBeep (void) {
return startBeep(0);
}
void
endBeep (void) {
if (beepDevice != INVALID_FILE_DESCRIPTOR) {
close(beepDevice);
beepDevice = INVALID_FILE_DESCRIPTOR;
}
}
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