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Index: head/usr.bin/Makefile
===================================================================
--- head/usr.bin/Makefile
+++ head/usr.bin/Makefile
@@ -7,6 +7,7 @@
apply \
asa \
awk \
+ backlight \
banner \
basename \
brandelf \
Index: head/usr.bin/backlight/Makefile
===================================================================
--- head/usr.bin/backlight/Makefile
+++ head/usr.bin/backlight/Makefile
@@ -0,0 +1,6 @@
+# $FreeBSD$
+
+PROG= backlight
+MAN= backlight.8
+
+.include <bsd.prog.mk>
Index: head/usr.bin/backlight/backlight.8
===================================================================
--- head/usr.bin/backlight/backlight.8
+++ head/usr.bin/backlight/backlight.8
@@ -0,0 +1,95 @@
+.\" Copyright (c) 2020 Emmanuel Vadot <manu@freebsd.org>
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd October 02, 2020
+.Dt BACKLIGHT 8
+.Os
+.Sh NAME
+.Nm backlight
+.Nd configure backlight hardware
+.Sh SYNOPSIS
+.Nm
+.Op Fl f Ar device
+.Op Fl q
+.Op Fl i
+.Op Ar value
+.Nm
+.Op Fl f Ar device
+incr | +
+.Op Ar value
+.Nm
+.Op Fl f Ar device
+decr | -
+.Op Ar value
+.Sh DESCRIPTION
+The
+.Nm
+utility can be used to configure brightness levels for registered backlights
+.Pp
+The options are as follows:
+.Bl -tag -width "-f device"
+.It Fl f Ar device
+Device to operate on.
+If not specified,
+.Pa /dev/backlight/backlight0
+is used.
+If an unqualified name is provided,
+.Pa /dev/backlight
+is automatically prepended.
+.It Fl q
+When querying the brightness level only print the value.
+.It Fl i
+Query information about the backlight (name, type).
+.It Ar value
+Set the brightness level to this value, must be between 0 and 100.
+.It Ar incr | +
+.Op Ar value
+Decrement the backlight level.
+If no value is specified a default of 10 percent is used.
+.It Ar decr | -
+.Op Ar value
+Increment the backlight level.
+If no value is specified a default of 10 percent is used.
+.El
+.Sh EXAMPLES
+.Bl -bullet
+.It
+Show the current brightness level
+.Bd -literal
+backlight -f /dev/backlight/backlight0
+.Ed
+.El
+.Sh SEE ALSO
+.Xr backlight 9
+.Sh HISTORY
+The
+.Nm
+utility appeared in
+.Fx 13.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+utility and this manual page were written by
+.An Emmanuel Vadot Aq Mt manu@FreeBSD.org .
Index: head/usr.bin/backlight/backlight.c
===================================================================
--- head/usr.bin/backlight/backlight.c
+++ head/usr.bin/backlight/backlight.c
@@ -0,0 +1,220 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2020 Emmanuel Vadot <manu@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <stdbool.h>
+#include <sys/capsicum.h>
+#include <sys/backlight.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <capsicum_helpers.h>
+
+#define BACKLIGHT_QUERY 0x0001
+#define BACKLIGHT_SET_BRIGHTNESS 0x0002
+#define BACKLIGHT_INCR 0x0004
+#define BACKLIGHT_DECR 0x0008
+#define BACKLIGHT_INFO 0x0010
+
+static char device_name[PATH_MAX] = "/dev/backlight/backlight0";
+
+static void
+set_device_name(const char *name)
+{
+
+ if (name[0] == '/')
+ strlcpy(device_name, name, sizeof(device_name));
+ else
+ snprintf(device_name, sizeof(device_name), "/dev/backlight/%s", name);
+}
+
+static void
+usage(void)
+{
+ fprintf(stderr, "Usage:\n");
+ fprintf(stderr, "\tbacklight [-f dev]\n");
+ fprintf(stderr, "\tbacklight [-f dev] -i\n");
+ fprintf(stderr, "\tbacklight [-f dev] <percent>\n");
+ fprintf(stderr, "\tbacklight [-f dev] incr|+ <percent>\n");
+ fprintf(stderr, "\tbacklight [-f dev] decr|- <percent>\n");
+ exit(1);
+}
+
+static const char *
+backlight_type_to_string(enum backlight_info_type type)
+{
+ switch (type) {
+ case BACKLIGHT_TYPE_PANEL:
+ return ("Panel");
+ case BACKLIGHT_TYPE_KEYBOARD:
+ return ("Keyboard");
+ }
+
+ return ("Unknown");
+}
+
+int
+main(int argc, char *argv[])
+{
+ struct backlight_props props;
+ struct backlight_info info;
+ int fd;
+ int action, ch;
+ cap_rights_t right_ioctl;
+ const unsigned long backlight_ioctls[] = {
+ BACKLIGHTGETSTATUS,
+ BACKLIGHTUPDATESTATUS,
+ BACKLIGHTGETINFO};
+ long percent = 0;
+ const char *percent_error;
+ uint32_t i;
+ bool setname;
+ bool quiet = false;
+
+ action = BACKLIGHT_QUERY;
+ setname = false;
+ fd = -1;
+
+ while ((ch = getopt(argc, argv, "f:qhi")) != -1) {
+ switch (ch) {
+ case 'q':
+ quiet = true;
+ break;
+ case 'f':
+ setname = true;
+ set_device_name(optarg);
+ break;
+ case 'i':
+ action = BACKLIGHT_INFO;
+ break;
+ case 'h':
+ usage();
+ break;
+ }
+ }
+
+ argc -= optind;
+ argv += optind;
+ if (argc != 0) {
+ if (strcmp("incr", argv[0]) == 0 ||
+ strcmp("+", argv[0]) == 0) {
+ action = BACKLIGHT_INCR;
+ argc -= 1;
+ argv += 1;
+ }
+ else if (strcmp("decr", argv[0]) == 0 ||
+ strcmp("-", argv[0]) == 0) {
+ action = BACKLIGHT_DECR;
+ argc -= 1;
+ argv += 1;
+ } else
+ action = BACKLIGHT_SET_BRIGHTNESS;
+
+ if (argc == 1) {
+ percent = strtonum(argv[0], 0, 100, &percent_error);
+ if (percent_error)
+ errx(1, "Cannot parse brightness level %s: %s",
+ argv[0],
+ percent_error);
+ }
+ }
+
+ if ((fd = open(device_name, O_RDWR)) == -1)
+ errx(1, "cannot open %s: %s",
+ device_name, strerror(errno));
+
+ if (caph_limit_stdio() < 0)
+ errx(1, "can't limit stdio rights");
+ caph_cache_catpages();
+ cap_rights_init(&right_ioctl, CAP_IOCTL);
+ if (caph_rights_limit(fd, &right_ioctl) < 0)
+ errx(1, "cap_right_limit() failed");
+ if (caph_ioctls_limit(fd, backlight_ioctls, nitems(backlight_ioctls)) < 0)
+ errx(1, "caph_ioctls_limit() failed");
+ if (caph_enter() < 0)
+ errx(1, "failed to enter capability mode");
+
+ switch (action) {
+ case BACKLIGHT_QUERY:
+ if (ioctl(fd, BACKLIGHTGETSTATUS, &props) == -1)
+ errx(1, "Cannot query the backlight device");
+ if (quiet)
+ printf("%u\n", props.brightness);
+ else {
+ printf("brightness: %d\n", props.brightness);
+ if (props.nlevels != 0) {
+ printf("levels:");
+ for (i = 0; i < props.nlevels; i++)
+ printf(" %d", props.levels[i]);
+ printf("\n");
+ }
+ }
+ break;
+ case BACKLIGHT_SET_BRIGHTNESS:
+ props.brightness = percent;
+ if (ioctl(fd, BACKLIGHTUPDATESTATUS, &props) == -1)
+ errx(1, "Cannot update the backlight device");
+ break;
+ case BACKLIGHT_INCR:
+ case BACKLIGHT_DECR:
+ if (ioctl(fd, BACKLIGHTGETSTATUS, &props) == -1)
+ errx(1, "Cannot query the backlight device");
+ percent = percent == 0 ? 10 : percent;
+ percent = action == BACKLIGHT_INCR ? percent : -percent;
+ props.brightness += percent;
+ if ((int)props.brightness < 0)
+ props.brightness = 0;
+ if (props.brightness > 100)
+ props.brightness = 100;
+ if (ioctl(fd, BACKLIGHTUPDATESTATUS, &props) == -1)
+ errx(1, "Cannot update the backlight device");
+ break;
+ case BACKLIGHT_INFO:
+ if (ioctl(fd, BACKLIGHTGETINFO, &info) == -1)
+ errx(1, "Cannot query the backlight device");
+ if (quiet == false) {
+ printf("Backlight name: %s\n", info.name);
+ printf("Backlight hardware type: %s\n", backlight_type_to_string(info.type));
+ } else {
+ printf("%s\n", info.name);
+ printf("%s\n", backlight_type_to_string(info.type));
+ }
+ break;
+ }
+
+ close(fd);
+ return (0);
+}

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