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diff --git a/Makefile b/Makefile
index 3be46cc..93dc2c5 100644
--- a/Makefile
+++ b/Makefile
@@ -6,6 +6,7 @@ include config.mk
REQ = util
COM =\
+ components/backlight\
components/battery\
components/cpu\
components/datetime\
diff --git a/components/backlight.c b/components/backlight.c
new file mode 100644
index 0000000..74f4c08
--- /dev/null
+++ b/components/backlight.c
@@ -0,0 +1,59 @@
+/* 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
diff --git a/config.def.h b/config.def.h
index 5f6c114..69c5d50 100644
--- a/config.def.h
+++ b/config.def.h
@@ -12,6 +12,9 @@ static const char unknown_str[] = "n/a";
/*
* function description argument (example)
*
+ * backlight_perc backlight percentage device name
+ * (intel_backlight)
+ * NULL on OpenBSD
* battery_perc battery percentage battery name (BAT0)
* NULL on OpenBSD/FreeBSD
* battery_state battery charging state battery name (BAT0)
diff --git a/slstatus.h b/slstatus.h
index f3b4979..e1759a0 100644
--- a/slstatus.h
+++ b/slstatus.h
@@ -1,5 +1,8 @@
/* See LICENSE file for copyright and license details. */
+/* backlight */
+const char *backlight_perc(const char *);
+
/* battery */
const char *battery_perc(const char *);
const char *battery_state(const char *);
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