86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <stddef.h>
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#include "../util.h"
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#if defined(__linux__)
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#include <limits.h>
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#define BRIGHTNESS_MAX "/sys/class/backlight/%s/max_brightness"
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#define BRIGHTNESS_CUR "/sys/class/backlight/%s/brightness"
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const char *
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backlight_perc(const char *card)
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{
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char path[PATH_MAX];
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int max, cur;
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if (esnprintf(path, sizeof (path), BRIGHTNESS_MAX, card) < 0 ||
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pscanf(path, "%d", &max) != 1) {
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return NULL;
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}
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if (esnprintf(path, sizeof (path), BRIGHTNESS_CUR, card) < 0 ||
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pscanf(path, "%d", &cur) != 1) {
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return NULL;
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}
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if (max == 0) {
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return NULL;
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}
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return bprintf("%d", cur * 100 / max);
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}
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#elif defined(__OpenBSD__)
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <dev/wscons/wsconsio.h>
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const char *
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backlight_perc(const char *unused)
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{
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int fd, err;
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struct wsdisplay_param wsd_param = {
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.param = WSDISPLAYIO_PARAM_BRIGHTNESS
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};
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if ((fd = open("/dev/ttyC0", O_RDONLY)) < 0) {
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warn("could not open /dev/ttyC0");
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return NULL;
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}
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if ((err = ioctl(fd, WSDISPLAYIO_GETPARAM, &wsd_param)) < 0) {
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warn("ioctl 'WSDISPLAYIO_GETPARAM' failed");
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return NULL;
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}
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return bprintf("%d", wsd_param.curval * 100 / wsd_param.max);
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}
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#elif defined(__FreeBSD__)
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <sys/backlight.h>
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#define FBSD_BACKLIGHT_DEV "/dev/backlight/%s"
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const char *
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backlight_perc(const char *card)
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{
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char buf[256];
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struct backlight_props props;
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int fd;
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snprintf(buf, sizeof(buf), FBSD_BACKLIGHT_DEV, card);
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if ((fd = open(buf, O_RDWR)) == -1) {
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warn("could not open %s", card);
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return NULL;
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}
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if (ioctl(fd, BACKLIGHTGETSTATUS, &props) == -1){
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warn("Cannot query the backlight device");
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return NULL;
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}
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return bprintf("%d", props.brightness);
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}
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#endif
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