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	slstatus-backlight-20240127-f68f492.diff (4098B)
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	1 From aadea01ca9cd99932500f4988d7c57f6bc5fa6c5 Mon Sep 17 00:00:00 2001
	2 From: Son Phan Trung <[email protected]>
	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" i…
	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…
	54 + pscanf(path, "%d", &max) != 1) {
	55 + return NULL;
	56 + }
	57 +
	58 + if (esnprintf(path, sizeof (path), BRIGHTNESS_CUR, card…
	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))…
	88 + warn("ioctl 'WSDISPLAYIO_GETPARAM' failed");
	89 + return NULL;
	90 + }
	91 + return bprintf("%d", wsd_param.curval * 100 / wsd_param…
	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 (exampl…
	128 *
	129 + * backlight_perc backlight percentage device name
	130 + * (intel_backlight…
	131 + * NULL on OpenBSD
	132 * battery_perc battery percentage battery name (BA…
	133 * NULL on OpenBSD/…
	134 * battery_remaining battery remaining HH:MM battery name (BA…
	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