[hackers] [slstatus] Add basic backlight percentage support || David Demelier

From: <git_AT_suckless.org>
Date: Tue, 22 May 2018 12:40:59 +0200 (CEST)

commit 37724ac2c3f496f4736223d0d8e5d8fecb933590
Author: David Demelier <markand_AT_malikania.fr>
AuthorDate: Tue May 22 09:23:29 2018 +0200
Commit: Aaron Marcher <me_AT_drkhsh.at>
CommitDate: Tue May 22 12:40:31 2018 +0200

    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 0e925cc..8e18969 100644
--- a/Makefile
+++ b/Makefile
_AT_@ -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 c278599..f6041de 100644
--- a/README
+++ b/README
_AT_@ -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
index 0000000..f9c4096
--- /dev/null
+++ b/components/backlight.c
_AT_@ -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 f144393..45320a3 100644
--- a/config.def.h
+++ b/config.def.h
_AT_@ -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 8bd8bb5..a18b881 100644
--- a/slstatus.h
+++ b/slstatus.h
_AT_@ -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 b474f88..f55c0eb 100644
--- a/util.h
+++ b/util.h
_AT_@ -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))
Received on Tue May 22 2018 - 12:40:59 CEST