diff --git a/usr.bin/backlight/backlight.c b/usr.bin/backlight/backlight.c index 9cf7a0912e95..7c3f295223f5 100644 --- a/usr.bin/backlight/backlight.c +++ b/usr.bin/backlight/backlight.c @@ -1,229 +1,226 @@ /*- * 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 = -1; 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 (strlen(argv[0]) > 0 && 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: if (percent == -1) usage(); props.brightness = percent; if (ioctl(fd, BACKLIGHTUPDATESTATUS, &props) == -1) errx(1, "Cannot update the backlight device"); break; case BACKLIGHT_INCR: case BACKLIGHT_DECR: if (percent == 0) /* Avoid any ioctl if we don't have anything to do */ break; if (ioctl(fd, BACKLIGHTGETSTATUS, &props) == -1) errx(1, "Cannot query the backlight device"); percent = percent == -1 ? 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); }