Add basic backlight percentage support

At the moment linux only, but will add support for OpenBSD as well.

diff --git a/Makefile b/Makefile
index 0e925cc260b81ac80a6fb8f3304d1a5acd28abeb..8e18969358f095991ffd152bd1ad2de0ac33abb7 100644 (file)
--- 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/README b/README
index c27859967c8e4fa9553f22a444c70cb62f4d9795..f6041de3b250ff3bad681a5439c9f7b3399ab5e4 100644 (file)
--- a/README
+++ b/README
@@ -6,6 +6,7 @@ slstatus is a suckless status monitor for window managers that use WM_NAME
 
 Features
 --------
+- Backlight percentage
 - Battery percentage/state/time left
 - CPU usage
 - CPU frequency

diff --git a/components/backlight.c b/components/backlight.c
new file mode 100644 (file)
index 0000000..f9c4096
--- /dev/null
+++ b/components/backlight.c
@@ -0,0 +1,32 @@
+/* See LICENSE file for copyright and license details. */
+#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);
+       }
+#endif

diff --git a/config.def.h b/config.def.h
index f144393eb32a16144321b48ef176cc868f5e036b..45320a30667cef06d365323e85c26b5a07e1ec3c 100644 (file)
--- a/config.def.h
+++ b/config.def.h
@@ -12,6 +12,8 @@ static const char unknown_str[] = "n/a";
 /*
  * function             description                     argument (example)
  *
+ * backlight_perc       backlight percentage            device name
+ *                                                      (intel_backlight)
  * battery_perc         battery percentage              battery name (BAT0)
  *                                                      NULL on OpenBSD
  * battery_state        battery charging state          battery name (BAT0)

diff --git a/slstatus.h b/slstatus.h
index 8bd8bb5eb19306f19080e3d7c077d92ad1111ffd..a18b881c4d18b408661407eb1afe27c06449f1e7 100644 (file)
--- 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 *);

diff --git a/util.h b/util.h
index b474f887f2eecb29dfccb27ba96110bdcb875720..f55c0eba96d0360c64534c21dedd5e3711316ee7 100644 (file)
--- a/util.h
+++ b/util.h
@@ -1,4 +1,6 @@
 /* See LICENSE file for copyright and license details. */
+#include <stddef.h>
+
 extern char buf[1024];
 
 #define LEN(x) (sizeof (x) / sizeof *(x))