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/** \file beep-driver-console.c
* \brief implement the beep console driver
* \author Copyright (C) 2000-2010 Johnathan Nightingale
* \author Copyright (C) 2010-2013 Gerfried Fuchs
* \author Copyright (C) 2019 Hans Ulrich Niedermann
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*
* \defgroup beep_driver_console Linux console API driver
* \ingroup beep_driver
*
* @{
*
*/
#include <stddef.h>
#include <unistd.h>
#include <linux/kd.h>
#include <sys/ioctl.h>
#include "beep-compiler.h"
#include "beep-drivers.h"
#include "beep-library.h"
#include "beep-log.h"
#ifndef CLOCK_TICK_RATE
/** The clock tick rate for calculating the PWM counter for the PIT from the frequency.
*
* Using the PIT_TICK_RATE value from the kernel.
*/
#define CLOCK_TICK_RATE 1193182UL
#endif
static
int open_checked_device(const char *const device_name)
{
const int fd = open_checked_char_device(device_name);
if (fd == -1) {
return -1;
}
if (-1 == ioctl(fd, KIOCSOUND, 0)) {
log_verbose("console: %d does not implement KIOCSOUND API", fd);
return -1;
}
return fd;
}
static
bool driver_detect(beep_driver *driver, const char *console_device)
{
if (console_device) {
log_verbose("console driver_detect %p %s",
(void *)driver, console_device);
} else {
log_verbose("console driver_detect %p %p",
(void *)driver, (const void *)console_device);
}
if (console_device) {
const int fd = open_checked_device(console_device);
if (fd >= 0) {
driver->device_fd = fd;
driver->device_name = console_device;
return true;
}
} else {
/** \todo We could iterate over all `/dev/tty[0-9]+` and
* `/dev/vc/[0-9]+` devices until one is a character
* device special file which can be `open(2)`ed with
* `O_WRONLY`. (We already have that code in
* `issue-6-benchmark.c`.) Is that advisable from a
* robustness and/or security point of view?
*/
static
const char *const console_device_list[] =
{
"/dev/tty0",
"/dev/vc/0",
};
for (size_t i=0; i<(sizeof(console_device_list)/sizeof(console_device_list[0])); ++i) {
const char *const device_name = console_device_list[i];
const int fd = open_checked_device(device_name);
if (-1 != fd) {
driver->device_fd = fd;
driver->device_name = device_name;
return true;
}
}
}
return false;
}
static
void driver_init(beep_driver *driver)
{
log_verbose("console driver_init %p", (void *)driver);
}
static
void driver_fini(beep_driver *driver)
{
log_verbose("console driver_fini %p", (void *)driver);
close(driver->device_fd);
driver->device_fd = -1;
}
static
void driver_begin_tone(beep_driver *driver, const uint16_t freq)
{
log_verbose("console driver_begin_tone %p %u", (void *)driver, freq);
const uintptr_t argp = ((freq != 0) ? (CLOCK_TICK_RATE/freq) : freq) & 0xffff;
if (-1 == ioctl(driver->device_fd, KIOCSOUND, argp)) {
/* If we cannot use the sound API, we cannot silence the sound either */
safe_error_exit("ioctl KIOCSOUND");
}
}
static
void driver_end_tone(beep_driver *driver)
{
log_verbose("console driver_end_tone %p", (void *)driver);
if (-1 == ioctl(driver->device_fd, KIOCSOUND, 0)) {
safe_error_exit("ioctl KIOCSOUND");
}
}
static
beep_driver driver_data =
{
"console",
NULL,
driver_detect,
driver_init,
driver_fini,
driver_begin_tone,
driver_end_tone,
0,
NULL
};
static
void beep_driver_console_constructor(void)
CONSTRUCTOR_FUNCTION;
static
void beep_driver_console_constructor(void)
{
log_verbose("beep_driver_console_constructor");
beep_drivers_register(&driver_data);
}
/** @} */
/*
* Local Variables:
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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