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/* See LICENSE file for copyright and license details. */
#include <stddef.h>
#include "../util.h"
#if defined(__linux__)
#include <limits.h>
#define BRIGHTNESS_MAX "/sys/class/backlight/%s/max_brightness"
#define BRIGHTNESS_CUR "/sys/class/backlight/%s/brightness"
const char *
backlight_perc(const char *card)
{
char path[PATH_MAX];
int max, cur;
if (esnprintf(path, sizeof (path), BRIGHTNESS_MAX, card) < 0 ||
pscanf(path, "%d", &max) != 1) {
return NULL;
}
if (esnprintf(path, sizeof (path), BRIGHTNESS_CUR, card) < 0 ||
pscanf(path, "%d", &cur) != 1) {
return NULL;
}
if (max == 0) {
return NULL;
}
return bprintf("%d%%", cur * 100 / max);
}
#elif defined(__OpenBSD__)
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <dev/wscons/wsconsio.h>
const char *
backlight_perc(const char *unused)
{
int fd, err;
struct wsdisplay_param wsd_param = {
.param = WSDISPLAYIO_PARAM_BRIGHTNESS
};
if ((fd = open("/dev/ttyC0", O_RDONLY)) < 0) {
warn("could not open /dev/ttyC0");
return NULL;
}
if ((err = ioctl(fd, WSDISPLAYIO_GETPARAM, &wsd_param)) < 0) {
warn("ioctl 'WSDISPLAYIO_GETPARAM' failed");
return NULL;
}
return bprintf("%d", wsd_param.curval * 100 / wsd_param.max);
}
#endif
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