Index: head/usr.bin/backlight/backlight.8 =================================================================== --- head/usr.bin/backlight/backlight.8 (revision 366470) +++ head/usr.bin/backlight/backlight.8 (revision 366471) @@ -1,95 +1,96 @@ .\" Copyright (c) 2020 Emmanuel Vadot .\" .\" 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 +.Dd October 06, 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. +A trailing '%' is valid. .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 (revision 366470) +++ head/usr.bin/backlight/backlight.c (revision 366471) @@ -1,220 +1,223 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2020 Emmanuel Vadot * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #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] \n"); fprintf(stderr, "\tbacklight [-f dev] incr|+ \n"); fprintf(stderr, "\tbacklight [-f dev] decr|- \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) { + /* ignore a trailing % for user friendlyness */ + if (argv[0][strlen(argv[0]) - 1] == '%') + argv[0][strlen(argv[0]) - 1] = '\0'; 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); }