---
Makefile | 1 +
components/backlight.c | 36 ++++++++++++++++++++++++++++++++++++
config.def.h | 1 +
slstatus.h | 3 +++
4 files changed, 41 insertions(+)
create mode 100644 components/backlight.c
diff --git a/Makefile b/Makefile
index 945b5e3..28a205f 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..fcc062a
--- /dev/null
+++ b/components/backlight.c
@@ -0,0 +1,36 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdio.h>
+#include <string.h>
+
+#include "../util.h"
+
+#if defined(__linux__)
+ #include <limits.h>
+ #include <stdint.h>
+ #include <unistd.h>
+
+ const char *
+ backlight_perc(const char *backlight)
+ {
+ float value;
+ char path[PATH_MAX];
+
+ if (esnprintf(path, sizeof(path),
+ "/sys/class/backlight/%s/actual_brightness",
backlight) < 0) {
+ return NULL;
+ }
+ if (pscanf(path, "%f", &value) != 1) {
+ return NULL;
+ }
+
+ return bprintf("%d", (int)(value / 852 * 100));
+ }
+
+#else
+ const char *
+ backlight_perc(const char *backlight)
+ {
+ return NULL;
+ }
+
+#endif
diff --git a/config.def.h b/config.def.h
index e06be66..d0996ef 100644
--- a/config.def.h
+++ b/config.def.h
@@ -12,6 +12,7 @@ static const char unknown_str[] = "n/a";
/*
* function description argument (example)
*
+ * backlight_perc backlight percentage backlight name
(intel_backlight)
* 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 08f610a..d9c0b5f 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 *backlight);
+
/* battery */
const char *battery_perc(const char *);
const char *battery_state(const char *);
--
2.21.0
