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slstatus-backlight-20240127-f68f492.diff (4098B)

      1 From aadea01ca9cd99932500f4988d7c57f6bc5fa6c5 Mon Sep 17 00:00:00 2001
      2 From: Son Phan Trung <phantrungson17@gmail.com>
      3 Date: Sat, 27 Jan 2024 21:10:41 +0700
      4 Subject: [PATCH] Add backlight module for slstatus.
      5 
      6 FreeBSD support is added, with these things to keep in mind:
      7 - Device names are numbered compared to Linux (e.g. "intel_backlight0" instead "intel_backlight).
      8 - Max number is hardcoded to 100.
      9 ---
     10  Makefile               |  1 +
     11  components/backlight.c | 86 ++++++++++++++++++++++++++++++++++++++++++
     12  config.def.h           |  3 ++
     13  slstatus.h             |  3 ++
     14  4 files changed, 93 insertions(+)
     15  create mode 100644 components/backlight.c
     16 
     17 diff --git a/Makefile b/Makefile
     18 index 7a18274..a7eacfa 100644
     19 --- a/Makefile
     20 +++ b/Makefile
     21 @@ -6,6 +6,7 @@ include config.mk
     22  
     23  REQ = util
     24  COM =\
     25 +	components/backlight\
     26  	components/battery\
     27  	components/cat\
     28  	components/cpu\
     29 diff --git a/components/backlight.c b/components/backlight.c
     30 new file mode 100644
     31 index 0000000..46240f6
     32 --- /dev/null
     33 +++ b/components/backlight.c
     34 @@ -0,0 +1,86 @@
     35 +/* See LICENSE file for copyright and license details. */
     36 +
     37 +#include <stddef.h>
     38 +
     39 +#include "../util.h"
     40 +
     41 +#if defined(__linux__)
     42 +	#include <limits.h>
     43 +
     44 +	#define BRIGHTNESS_MAX "/sys/class/backlight/%s/max_brightness"
     45 +	#define BRIGHTNESS_CUR "/sys/class/backlight/%s/brightness"
     46 +
     47 +	const char *
     48 +	backlight_perc(const char *card)
     49 +	{
     50 +		char path[PATH_MAX];
     51 +		int max, cur;
     52 +
     53 +		if (esnprintf(path, sizeof (path), BRIGHTNESS_MAX, card) < 0 ||
     54 +			pscanf(path, "%d", &max) != 1) {
     55 +			return NULL;
     56 +		}
     57 +
     58 +		if (esnprintf(path, sizeof (path), BRIGHTNESS_CUR, card) < 0 ||
     59 +			pscanf(path, "%d", &cur) != 1) {
     60 +			return NULL;
     61 +		}
     62 +
     63 +		if (max == 0) {
     64 +			return NULL;
     65 +		}
     66 +
     67 +		return bprintf("%d%%", cur * 100 / max);
     68 +	}
     69 +#elif defined(__OpenBSD__)
     70 +	#include <fcntl.h>
     71 +	#include <sys/ioctl.h>
     72 +	#include <sys/time.h>
     73 +	#include <dev/wscons/wsconsio.h>
     74 +
     75 +	const char *
     76 +	backlight_perc(const char *unused)
     77 +	{
     78 +		int fd, err;
     79 +		struct wsdisplay_param wsd_param = {
     80 +			.param = WSDISPLAYIO_PARAM_BRIGHTNESS
     81 +		};
     82 +
     83 +		if ((fd = open("/dev/ttyC0", O_RDONLY)) < 0) {
     84 +			warn("could not open /dev/ttyC0");
     85 +			return NULL;
     86 +		}
     87 +		if ((err = ioctl(fd, WSDISPLAYIO_GETPARAM, &wsd_param)) < 0) {
     88 +			warn("ioctl 'WSDISPLAYIO_GETPARAM' failed");
     89 +			return NULL;
     90 +		}
     91 +		return bprintf("%d", wsd_param.curval * 100 / wsd_param.max);
     92 +	}
     93 +#elif defined(__FreeBSD__)
     94 +	#include <fcntl.h>
     95 +	#include <stdio.h>
     96 +	#include <sys/ioctl.h>
     97 +	#include <sys/backlight.h>
     98 +
     99 +	#define FBSD_BACKLIGHT_DEV "/dev/backlight/%s"
    100 +
    101 +	const char *
    102 +	backlight_perc(const char *card)
    103 +	{
    104 +		char buf[256];
    105 +		struct backlight_props props;
    106 +		int fd;
    107 +		
    108 +		snprintf(buf, sizeof(buf), FBSD_BACKLIGHT_DEV, card);
    109 +		if ((fd = open(buf, O_RDWR)) == -1) {
    110 +			warn("could not open %s", card);
    111 +			return NULL;
    112 +		}
    113 +		if (ioctl(fd, BACKLIGHTGETSTATUS, &props) == -1){
    114 +			warn("Cannot query the backlight device");
    115 +			return NULL;
    116 +		}
    117 +
    118 +		return bprintf("%d", props.brightness);
    119 +	}
    120 +#endif
    121 diff --git a/config.def.h b/config.def.h
    122 index d805331..d56051d 100644
    123 --- a/config.def.h
    124 +++ b/config.def.h
    125 @@ -12,6 +12,9 @@ static const char unknown_str[] = "n/a";
    126  /*
    127   * function            description                     argument (example)
    128   *
    129 + * backlight_perc      backlight percentage            device name
    130 + *                                                     (intel_backlight, numbered on FreeBSD)
    131 + *                                                     NULL on OpenBSD
    132   * battery_perc        battery percentage              battery name (BAT0)
    133   *                                                     NULL on OpenBSD/FreeBSD
    134   * battery_remaining   battery remaining HH:MM         battery name (BAT0)
    135 diff --git a/slstatus.h b/slstatus.h
    136 index 8ef5874..dc7e2d0 100644
    137 --- a/slstatus.h
    138 +++ b/slstatus.h
    139 @@ -1,5 +1,8 @@
    140  /* See LICENSE file for copyright and license details. */
    141  
    142 +/* backlight */
    143 +const char *backlight_perc(const char *);
    144 +
    145  /* battery */
    146  const char *battery_perc(const char *);
    147  const char *battery_remaining(const char *);
    148 -- 
    149 2.42.0
    150