/* * fancontrol-ng.c: clone of fancontrol from lm_sensors * * Copyright (c) 2016, Přemysl Janouch * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * */ #define LIBERTY_WANT_POLLER #include "config.h" #undef PROGRAM_NAME #define PROGRAM_NAME "fancontrol-ng" #include "liberty/liberty.c" // --- Main program ------------------------------------------------------------ struct device { LIST_HEADER (struct device) struct app_context *ctx; ///< Application context struct config_item *config; ///< Configuration root for the device char *path; ///< Base path struct poller_timer timer; ///< Refresh timer }; struct app_context { struct poller poller; ///< Poller bool polling; ///< The event loop is running struct config_item *config; ///< Program configuration struct device *devices; ///< All devices }; // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static void log_message_custom (void *user_data, const char *quote, const char *fmt, va_list ap) { (void) user_data; FILE *stream = stdout; // TODO: sd-daemon.h log level prefixes? fputs (quote, stream); vfprintf (stream, fmt, ap); fputs ("\n", stream); } static char * read_file_cstr (const char *path, struct error **e) { struct str s; str_init (&s); if (read_file (path, &s, e)) return str_steal (&s); str_free (&s); return NULL; } static int64_t read_file_unsigned (const char *path, struct error **e) { char *s, *end; if (!(s = read_file_cstr (path, e))) return -1; if ((end = strpbrk (s, "\r\n"))) *end = 0; unsigned long num; bool ok = xstrtoul (&num, s, 10); free (s); if (!ok || num > INT64_MAX) { error_set (e, "error reading `%s': %s", path, "invalid integer value"); return -1; } return num; } static bool write_file_printf (const char *path, struct error **e, const char *format, ...) ATTRIBUTE_PRINTF (3, 4); static bool write_file_printf (const char *path, struct error **e, const char *format, ...) { struct str s; str_init (&s); va_list ap; va_start (ap, format); str_append_vprintf (&s, format, ap); va_end (ap); bool success = write_file (path, s.str, s.len, e); str_free (&s); return success; } // --- Configuration ----------------------------------------------------------- static bool config_validate_nonnegative (const struct config_item *item, struct error **e) { if (item->type == CONFIG_ITEM_NULL) return true; hard_assert (item->type == CONFIG_ITEM_INTEGER); if (item->value.integer >= 0) return true; return error_set (e, "must be non-negative"); } static struct config_schema g_config_device[] = { { .name = "name", .comment = "Device identifier", .type = CONFIG_ITEM_STRING }, { .name = "interval", .comment = "Temperature checking interval", .type = CONFIG_ITEM_INTEGER, .validate = config_validate_nonnegative, .default_ = "5" }, {} }; static struct config_schema g_config_pwm[] = { { .name = "temp", .comment = "Path to temperature sensor output", .type = CONFIG_ITEM_STRING }, { .name = "min_temp", .comment = "Temperature for no fan operation", .type = CONFIG_ITEM_INTEGER, .validate = config_validate_nonnegative, .default_ = "40" }, { .name = "max_temp", .comment = "Temperature for maximum fan operation", .type = CONFIG_ITEM_INTEGER, .validate = config_validate_nonnegative, .default_ = "80" }, { .name = "min_start", .comment = "Minimum value for the fan to start spinning", .type = CONFIG_ITEM_INTEGER, .validate = config_validate_nonnegative, .default_ = "0" }, { .name = "min_stop", .comment = "Mimimum value for the fan to stop spinning", .type = CONFIG_ITEM_INTEGER, .validate = config_validate_nonnegative, .default_ = "0" }, { .name = "pwm_min", .comment = "Minimum PWM value to use", .type = CONFIG_ITEM_INTEGER, .validate = config_validate_nonnegative }, { .name = "pwm_max", .comment = "Maximum PWM value to use", .type = CONFIG_ITEM_INTEGER, .validate = config_validate_nonnegative }, {} }; // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static int64_t get_config_integer (struct config_item *root, const char *key) { struct config_item *item = config_item_get (root, key, NULL); hard_assert (item && item->type == CONFIG_ITEM_INTEGER); return item->value.integer; } static const char * get_config_string (struct config_item *root, const char *key) { struct config_item *item = config_item_get (root, key, NULL); hard_assert (item); if (item->type == CONFIG_ITEM_NULL) return NULL; hard_assert (config_item_type_is_string (item->type)); return item->value.string.str; } // --- Fan control ------------------------------------------------------------- // Consider this a failed attempt to avoid creating special PWM objects // based on the configuration. The complexity just moved somewhere else. struct paths { char *temp; ///< Current temperature char *pwm; ///< Current PWM value char *pwm_enable; ///< PWM control state char *pwm_min; ///< Minimum PWM value char *pwm_max; ///< Maximum PWM value }; static struct paths * paths_new (const char *device_path, const char *path, struct config_item *pwm) { struct paths *self = xcalloc (1, sizeof *self); self->temp = xstrdup_printf ("%s/%s", device_path, get_config_string (pwm, "temp")); self->pwm = xstrdup_printf ("%s/%s", device_path, path); self->pwm_enable = xstrdup_printf ("%s/%s_enable", device_path, path); self->pwm_min = xstrdup_printf ("%s/%s_min", device_path, path); self->pwm_max = xstrdup_printf ("%s/%s_max", device_path, path); return self; } static void paths_destroy (struct paths *self) { free (self->temp); free (self->pwm); free (self->pwm_enable); free (self->pwm_min); free (self->pwm_max); } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static bool pwm_update (struct paths *paths, struct config_item *pwm, struct error **e) { int64_t cur_enable, cur_temp, cur_pwm, pwm_min, pwm_max; if ((cur_enable = read_file_unsigned (paths->pwm_enable, e)) < 0 || (cur_temp = read_file_unsigned (paths->temp, e)) < 0 || (cur_pwm = read_file_unsigned (paths->pwm, e)) < 0) return false; struct config_item *pwm_min_item = config_item_get (pwm, "pwm_min", NULL); if (pwm_min_item->type == CONFIG_ITEM_INTEGER) pwm_min = pwm_min_item->value.integer; else if ((pwm_min = read_file_unsigned (paths->pwm_min, NULL)) < 0) pwm_min = 0; struct config_item *pwm_max_item = config_item_get (pwm, "pwm_max", NULL); if (pwm_max_item->type == CONFIG_ITEM_INTEGER) pwm_max = pwm_max_item->value.integer; else if ((pwm_max = read_file_unsigned (paths->pwm_max, NULL)) < 0) pwm_max = 255; int64_t min_temp = get_config_integer (pwm, "min_temp"); int64_t max_temp = get_config_integer (pwm, "max_temp"); int64_t min_start = get_config_integer (pwm, "min_start"); int64_t min_stop = get_config_integer (pwm, "min_stop"); #define FAIL(...) error_set (e, __VA_ARGS__) if (min_temp >= max_temp) FAIL ("min_temp must be less than max_temp"); if (pwm_max > 255) FAIL ("pwm_max must be at most 255"); if (min_stop >= pwm_max) FAIL ("min_stop must be less than pwm_max"); if (min_stop < pwm_min) FAIL ("min_stop must be at least pwm_min"); #undef FAIL // I'm not sure if this strangely complicated computation is justifiable double where = ((double) cur_temp / 1000 - min_temp) / ((double) max_temp - min_temp); int64_t new_pwm; if (where <= 0) new_pwm = pwm_min; else if (where >= 1) new_pwm = pwm_max; else { new_pwm = min_stop + where * (pwm_max - min_stop); // If needed, we start the fan until next iteration if (cur_pwm <= min_stop) new_pwm = MAX (new_pwm, min_start); } new_pwm = MAX (new_pwm, pwm_min); new_pwm = MIN (new_pwm, pwm_max); if (cur_enable != 1 && !write_file_printf (paths->pwm_enable, e, "1")) return false; if (!write_file_printf (paths->pwm, e, "%" PRId64, new_pwm)) return false; return true; } static bool pwm_set_enable (struct paths *paths, char value) { struct error *e = NULL; if (write_file (paths->pwm_enable, &value, 1, &e)) return true; print_error ("failed to change PWM mode to %c: %s", value, e->message); error_free (e); return false; } static bool pwm_give_up (struct paths *paths) { // Try automatic control, and if that fails, go full speed return pwm_set_enable (paths, '2') || pwm_set_enable (paths, '0'); } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - struct pwm_iter { struct str_map_iter object_iter; ///< Configuration iterator struct device *device; ///< Device struct config_item *pwm; ///< PWM const char *pwm_path; ///< PWM path struct paths *paths; ///< Paths }; static void pwm_iter_init (struct pwm_iter *self, struct device *device) { str_map_iter_init (&self->object_iter, &config_item_get (device->config, "pwms", NULL)->value.object); self->device = device; self->paths = NULL; } static void pwm_iter_free (struct pwm_iter *self) { if (self->paths) { paths_destroy (self->paths); self->paths = NULL; } } static bool pwm_iter_next (struct pwm_iter *self) { pwm_iter_free (self); if (!(self->pwm = str_map_iter_next (&self->object_iter))) return false; self->pwm_path = self->object_iter.link->key; self->paths = paths_new (self->device->path, self->pwm_path, self->pwm); return true; } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static void device_run (struct device *self) { struct pwm_iter iter; pwm_iter_init (&iter, self); while (pwm_iter_next (&iter)) { struct error *e = NULL; if (pwm_update (iter.paths, iter.pwm, &e)) continue; print_error ("pwm `%s': %s", iter.pwm_path, e->message); error_free (e); pwm_give_up (iter.paths); } pwm_iter_free (&iter); poller_timer_set (&self->timer, 1000 * get_config_integer (self->config, "interval")); } static void device_stop (struct device *self) { struct pwm_iter iter; pwm_iter_init (&iter, self); while (pwm_iter_next (&iter)) pwm_give_up (iter.paths); pwm_iter_free (&iter); } static void device_create (struct app_context *ctx, const char *path, struct config_item *root) { struct device *self = xcalloc (1, sizeof *self); self->config = root; self->path = xstrdup (path); poller_timer_init (&self->timer, &ctx->poller); self->timer.dispatcher = (poller_timer_fn) device_run; self->timer.user_data = self; LIST_PREPEND (ctx->devices, self); } // --- Configuration ----------------------------------------------------------- // There is no room for errors in the configuration, everything must be valid. // Thus the reset to defaults on invalid values is effectively disabled here. static bool apply_schema (struct config_schema *schema, struct config_item *object, struct error **e) { struct error *warning = NULL, *error = NULL; config_schema_initialize_item (schema, object, NULL, &warning, &error); if (error && warning) { error_free (warning); error_propagate (e, error); return false; } if (error) { error_propagate (e, error); return false; } if (warning) { // The standard warning is inappropriate here error_free (warning); return error_set (e, "invalid item `%s'", schema->name); } return true; } static bool check_device_configuration (struct config_item *subtree, struct error **e) { // Check regular fields in the device object for (struct config_schema *s = g_config_device; s->name; s++) if (!apply_schema (s, subtree, e)) return false; // Check for a subobject with PWMs to control struct config_item *pwms; if (!(pwms = config_item_get (subtree, "pwms", e))) return false; if (pwms->type != CONFIG_ITEM_OBJECT) return error_set (e, "`%s' is not an object", "pwms"); if (!pwms->value.object.len) return error_set (e, "no PWMs defined"); // Check regular fields in all PWM subobjects struct str_map_iter iter; str_map_iter_init (&iter, &pwms->value.object); struct config_item *pwm; struct error *error = NULL; while ((pwm = str_map_iter_next (&iter))) { const char *subpath = iter.link->key; for (struct config_schema *s = g_config_pwm; s->name; s++) if (!apply_schema (s, pwm, &error)) { error_set (e, "PWM `%s': %s", subpath, error->message); error_free (error); return false; } if (!get_config_string (pwm, "temp")) { return error_set (e, "PWM `%s': %s", subpath, "`temp' cannot be null"); } } return true; } static void load_configuration (struct app_context *ctx, const char *config_path) { struct error *e = NULL; struct config_item *root = config_read_from_file (config_path, &e); if (e) { print_error ("error loading configuration: %s", e->message); error_free (e); exit (EXIT_FAILURE); } struct str_map_iter iter; str_map_iter_init (&iter, &(ctx->config = root)->value.object); struct config_item *subtree; while ((subtree = str_map_iter_next (&iter))) { const char *path = iter.link->key; if (subtree->type != CONFIG_ITEM_OBJECT) exit_fatal ("device `%s' in configuration is not an object", path); else if (!check_device_configuration (subtree, &e)) exit_fatal ("device `%s': %s", path, e->message); else device_create (ctx, path, subtree); } } // --- Signals ----------------------------------------------------------------- static int g_signal_pipe[2]; ///< A pipe used to signal... signals static void sigterm_handler (int signum) { (void) signum; int original_errno = errno; if (write (g_signal_pipe[1], "", 1) == -1) soft_assert (errno == EAGAIN); errno = original_errno; } static void setup_signal_handlers (void) { if (pipe (g_signal_pipe) == -1) exit_fatal ("%s: %s", "pipe", strerror (errno)); set_cloexec (g_signal_pipe[0]); set_cloexec (g_signal_pipe[1]); // So that the pipe cannot overflow; it would make write() block within // the signal handler, which is something we really don't want to happen. // The same holds true for read(). set_blocking (g_signal_pipe[0], false); set_blocking (g_signal_pipe[1], false); (void) signal (SIGPIPE, SIG_IGN); struct sigaction sa; sa.sa_flags = SA_RESTART; sa.sa_handler = sigterm_handler; sigemptyset (&sa.sa_mask); if (sigaction (SIGINT, &sa, NULL) == -1 || sigaction (SIGTERM, &sa, NULL) == -1) exit_fatal ("sigaction: %s", strerror (errno)); } // --- Main program ------------------------------------------------------------ static void on_signal_pipe_readable (const struct pollfd *fd, struct app_context *ctx) { char id = 0; (void) read (fd->fd, &id, 1); ctx->polling = false; } static const char * parse_program_arguments (int argc, char **argv) { static const struct opt opts[] = { { 'd', "debug", NULL, 0, "run in debug mode" }, { 'h', "help", NULL, 0, "display this help and exit" }, { 'V', "version", NULL, 0, "output version information and exit" }, { 0, NULL, NULL, 0, NULL } }; struct opt_handler oh; opt_handler_init (&oh, argc, argv, opts, "CONFIG", "Fan controller."); int c; while ((c = opt_handler_get (&oh)) != -1) switch (c) { case 'd': g_debug_mode = true; break; case 'h': opt_handler_usage (&oh, stdout); exit (EXIT_SUCCESS); case 'V': printf (PROGRAM_NAME " " PROGRAM_VERSION "\n"); exit (EXIT_SUCCESS); default: print_error ("wrong options"); opt_handler_usage (&oh, stderr); exit (EXIT_FAILURE); } argc -= optind; argv += optind; if (argc != 1) { opt_handler_usage (&oh, stderr); exit (EXIT_FAILURE); } opt_handler_free (&oh); return argv[0]; } int main (int argc, char *argv[]) { g_log_message_real = log_message_custom; const char *config_path = parse_program_arguments (argc, argv); struct app_context ctx; memset (&ctx, 0, sizeof ctx); poller_init (&ctx.poller); setup_signal_handlers (); struct poller_fd signal_event; poller_fd_init (&signal_event, &ctx.poller, g_signal_pipe[0]); signal_event.dispatcher = (poller_fd_fn) on_signal_pipe_readable; signal_event.user_data = &ctx; poller_fd_set (&signal_event, POLLIN); load_configuration (&ctx, config_path); if (!ctx.devices) exit_fatal ("no devices present in configuration"); LIST_FOR_EACH (struct device, iter, ctx.devices) device_run (iter); ctx.polling = true; while (ctx.polling) poller_run (&ctx.poller); LIST_FOR_EACH (struct device, iter, ctx.devices) device_stop (iter); config_item_destroy (ctx.config); poller_free (&ctx.poller); return EXIT_SUCCESS; }