X-Git-Url: http://git.osdn.net/view?a=blobdiff_plain;f=control.c;h=1a5cd4d75fc2d0ed0f82277c141f066b8a084793;hb=1ee37bf989b90d3b8dd24bae497c15350de5fbec;hp=2bd6e17bf3c7eba7e84ef25a3a045f18389aa0b1;hpb=b8ba9bdee7681e37d988aaee3370ecce911ac14b;p=android-x86%2Fhardware-intel-libsensors.git diff --git a/control.c b/control.c index 2bd6e17..1a5cd4d 100644 --- a/control.c +++ b/control.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2014 Intel Corporation. + * Copyright (C) 2014-2015 Intel Corporation. */ #include @@ -9,9 +9,11 @@ #include #include #include +#include #include #include #include +#include #include "control.h" #include "enumeration.h" #include "utils.h" @@ -19,23 +21,27 @@ #include "calibration.h" #include "description.h" #include "filtering.h" - +#include /* Currently active sensors count, per device */ static int poll_sensors_per_dev[MAX_DEVICES]; /* poll-mode sensors */ static int trig_sensors_per_dev[MAX_DEVICES]; /* trigger, event based */ static int device_fd[MAX_DEVICES]; /* fd on the /dev/iio:deviceX file */ +static int events_fd[MAX_DEVICES]; /* fd on the /sys/bus/iio/devices/iio:deviceX/events/ file */ static int has_iio_ts[MAX_DEVICES]; /* ts channel available on this iio dev */ static int expected_dev_report_size[MAX_DEVICES]; /* expected iio scan len */ static int poll_fd; /* epoll instance covering all enabled sensors */ static int active_poll_sensors; /* Number of enabled poll-mode sensors */ +static int flush_event_fd[2]; /* Pipe used for flush signaling */ + /* We use pthread condition variables to get worker threads out of sleep */ static pthread_condattr_t thread_cond_attr [MAX_SENSORS]; static pthread_cond_t thread_release_cond [MAX_SENSORS]; static pthread_mutex_t thread_release_mutex [MAX_SENSORS]; +#define FLUSH_REPORT_TAG 900 /* * We associate tags to each of our poll set entries. These tags have the following values: * - a iio device number if the fd is a iio character device fd @@ -128,6 +134,21 @@ static int setup_trigger (int s, const char* trigger_val) return ret; } +static int enable_event(int dev_num, const char *name, int enabled) +{ + char sysfs_path[PATH_MAX]; + + sprintf(sysfs_path, EVENTS_PATH "%s", dev_num, name); + return sysfs_write_int(sysfs_path, enabled); +} + +static int enable_sensor(int dev_num, const char *tag, int enabled) +{ + char sysfs_path[PATH_MAX]; + + sprintf(sysfs_path, SENSOR_ENABLE_PATH, dev_num, tag); + return sysfs_write_int(sysfs_path, enabled); +} static void enable_iio_timestamp (int dev_num, int known_channels) { @@ -282,6 +303,8 @@ void build_sensor_report_maps (int dev_num) known_channels++; } + sensor_update_max_range(s); + /* Stop sampling - if we are recovering from hal restart */ enable_buffer(dev_num, 0); setup_trigger(s, "\n"); @@ -343,6 +366,7 @@ int adjust_counters (int s, int enabled, int from_virtual) * Adjust counters based on sensor enable action. Return values are: * 0 if the operation was completed and we're all set * 1 if we toggled the state of the sensor and there's work left + * -1 in case of an error */ int dev_num = sensor[s].dev_num; @@ -354,12 +378,16 @@ int adjust_counters (int s, int enabled, int from_virtual) ALOGI("Enabling sensor %d (iio device %d: %s)\n", s, dev_num, sensor[s].friendly_name); switch (sensor[s].type) { + case SENSOR_TYPE_ACCELEROMETER: + accel_cal_init(s); + break; + case SENSOR_TYPE_MAGNETIC_FIELD: - compass_read_data(&sensor[s]); + compass_read_data(s); break; case SENSOR_TYPE_GYROSCOPE: - gyro_cal_init(&sensor[s]); + gyro_cal_init(s); break; } } else { @@ -368,39 +396,55 @@ int adjust_counters (int s, int enabled, int from_virtual) /* Sensor disabled, lower report available flag */ sensor[s].report_pending = 0; - if (sensor[s].type == SENSOR_TYPE_MAGNETIC_FIELD) - compass_store_data(&sensor[s]); + /* Save calibration data to persistent storage */ + switch (sensor[s].type) { + case SENSOR_TYPE_ACCELEROMETER: + accel_cal_store(s); + break; + + case SENSOR_TYPE_MAGNETIC_FIELD: + compass_store_data(s); + break; - if (sensor[s].type == SENSOR_TYPE_GYROSCOPE) - gyro_store_data(&sensor[s]); + case SENSOR_TYPE_GYROSCOPE: + gyro_store_data(s); + break; + } } /* We changed the state of a sensor: adjust device ref counts */ - if (!sensor[s].is_polling) { - - if (enabled) - trig_sensors_per_dev[dev_num]++; - else - trig_sensors_per_dev[dev_num]--; + switch(sensor[s].mode) { + case MODE_TRIGGER: + if (enabled) + trig_sensors_per_dev[dev_num]++; + else + trig_sensors_per_dev[dev_num]--; + return 1; + case MODE_POLL: + if (enabled) { + active_poll_sensors++; + poll_sensors_per_dev[dev_num]++; return 1; - } - - if (enabled) { - active_poll_sensors++; - poll_sensors_per_dev[dev_num]++; + } else { + active_poll_sensors--; + poll_sensors_per_dev[dev_num]--; + return 1; + } + case MODE_EVENT: return 1; + default: + /* Invalid sensor mode */ + return -1; } - - active_poll_sensors--; - poll_sensors_per_dev[dev_num]--; - return 1; } -static int get_field_count (int s) +static int get_field_count (int s, size_t *field_size) { + *field_size = sizeof(float); + switch (sensor[s].type) { case SENSOR_TYPE_ACCELEROMETER: /* m/s^2 */ case SENSOR_TYPE_MAGNETIC_FIELD: /* micro-tesla */ @@ -409,17 +453,23 @@ static int get_field_count (int s) case SENSOR_TYPE_GYROSCOPE: /* radians/s */ return 3; + case SENSOR_TYPE_INTERNAL_INTENSITY: + case SENSOR_TYPE_INTERNAL_ILLUMINANCE: case SENSOR_TYPE_LIGHT: /* SI lux units */ case SENSOR_TYPE_AMBIENT_TEMPERATURE: /* °C */ case SENSOR_TYPE_TEMPERATURE: /* °C */ case SENSOR_TYPE_PROXIMITY: /* centimeters */ case SENSOR_TYPE_PRESSURE: /* hecto-pascal */ case SENSOR_TYPE_RELATIVE_HUMIDITY: /* percent */ + case SENSOR_TYPE_STEP_DETECTOR: /* event: always 1 */ return 1; case SENSOR_TYPE_ROTATION_VECTOR: return 4; + case SENSOR_TYPE_STEP_COUNTER: /* number of steps */ + *field_size = sizeof(uint64_t); + return 1; default: ALOGE("Unknown sensor type!\n"); return 0; /* Drop sample */ @@ -474,6 +524,7 @@ static void* acquisition_routine (void* param) int ret; struct timespec target_time; int64_t timestamp, period, start, stop; + size_t field_size; if (s < 0 || s >= sensor_count) { ALOGE("Invalid sensor handle!\n"); @@ -490,9 +541,9 @@ static void* acquisition_routine (void* param) /* Initialize data fields that will be shared by all sensor reports */ data.version = sizeof(sensors_event_t); data.sensor = s; - data.type = sensor[s].type; + data.type = sensor_desc[s].type; - num_fields = get_field_count(s); + num_fields = get_field_count(s, &field_size); /* * Each condition variable is associated to a mutex that has to be locked by the thread that's waiting on it. We use these condition @@ -509,7 +560,10 @@ static void* acquisition_routine (void* param) /* Read values through sysfs */ for (c=0; c selected_rate) && (sr <= max_rate_from_prop)) { + selected_rate = sr; + } + + /* + * If we reached a higher value than the desired rate, adjust selected rate so it matches the first higher available one and + * stop parsing - this makes the assumption that rates are sorted by increasing value in the allowed frequencies string. + */ + if (sr > requested_rate) { + return selected_rate; + } + } + + /* Check for wrong values */ + if (selected_rate < 0.1) { + return requested_rate; + } else { + return selected_rate; + } +} static int sensor_set_rate (int s, float requested_rate) { /* Set the rate at which a specific sensor should report events. See Android sensors.h for indication on sensor trigger modes */ char sysfs_path[PATH_MAX]; - char avail_sysfs_path[PATH_MAX]; int dev_num = sensor[s].dev_num; int i = sensor[s].catalog_index; const char *prefix = sensor_catalog[i].tag; int per_sensor_sampling_rate; int per_device_sampling_rate; - char freqs_buf[100]; - char* cursor; int n; float sr; float group_max_sampling_rate; float cur_sampling_rate; /* Currently used sampling rate */ float arb_sampling_rate; /* Granted sampling rate after arbitration */ + char hrtimer_sampling_path[PATH_MAX]; + char trigger_path[PATH_MAX]; ALOGV("Sampling rate %g requested on sensor %d (%s)\n", requested_rate, s, sensor[s].friendly_name); @@ -725,7 +825,7 @@ static int sensor_set_rate (int s, float requested_rate) return 0; /* If we're dealing with a poll-mode sensor */ - if (sensor[s].is_polling) { + if (sensor[s].mode == MODE_POLL) { if (is_enabled(s)) pthread_cond_signal(&thread_release_cond[s]); /* Wake up thread so the new sampling rate gets used */ return 0; @@ -752,58 +852,28 @@ static int sensor_set_rate (int s, float requested_rate) return -ENOSYS; } - /* Check if we have contraints on allowed sampling rates */ - - sprintf(avail_sysfs_path, DEVICE_AVAIL_FREQ_PATH, dev_num); - - if (sysfs_read_str(avail_sysfs_path, freqs_buf, sizeof(freqs_buf)) > 0) { - cursor = freqs_buf; - - /* Decode allowed sampling rates string, ex: "10 20 50 100" */ - - /* While we're not at the end of the string */ - while (*cursor && cursor[0]) { - - /* Decode a single value */ - sr = strtod(cursor, NULL); - - /* If this matches the selected rate, we're happy. Have some tolerance for rounding errors and avoid needless jumps to higher rates */ - if (fabs(arb_sampling_rate - sr) <= 0.001) { - arb_sampling_rate = sr; - break; - } - - /* - * If we reached a higher value than the desired rate, adjust selected rate so it matches the first higher available one and - * stop parsing - this makes the assumption that rates are sorted by increasing value in the allowed frequencies string. - */ - if (sr > arb_sampling_rate) { - arb_sampling_rate = sr; - break; - } - - /* Skip digits */ - while (cursor[0] && !isspace(cursor[0])) - cursor++; - - /* Skip spaces */ - while (cursor[0] && isspace(cursor[0])) - cursor++; - } + if (sensor[s].hrtimer_trigger_name[0] != '\0') { + snprintf(trigger_path, PATH_MAX, "%s%s%d/", IIO_DEVICES, "trigger", sensor[s].trigger_nr); + snprintf(hrtimer_sampling_path, PATH_MAX, "%s%s", trigger_path, "sampling_frequency"); + /* Enforce frequency update when software trigger + * frequency and current sampling rate are different */ + if (sysfs_read_float(hrtimer_sampling_path, &sr) != -1 && sr != cur_sampling_rate) + cur_sampling_rate = -1; + } else { + arb_sampling_rate = select_closest_available_rate(s, arb_sampling_rate); } - if (sensor[s].max_supported_rate && - arb_sampling_rate > sensor[s].max_supported_rate) { - arb_sampling_rate = sensor[s].max_supported_rate; - } + /* Record the rate that was agreed upon with the sensor taken in isolation ; this avoid uncontrolled ripple effects between colocated sensor rates */ + sensor[s].semi_arbitrated_rate = arb_sampling_rate; /* Coordinate with others active sensors on the same device, if any */ if (per_device_sampling_rate) for (n=0; n arb_sampling_rate) { + if (n != s && sensor[n].dev_num == dev_num && sensor[n].num_channels && is_enabled(n) && + sensor[n].semi_arbitrated_rate > arb_sampling_rate) { ALOGV("Sampling rate shared between %s and %s, using %g instead of %g\n", sensor[s].friendly_name, sensor[n].friendly_name, - sensor[n].sampling_rate, arb_sampling_rate); - arb_sampling_rate = sensor[n].sampling_rate; + sensor[n].semi_arbitrated_rate, arb_sampling_rate); + arb_sampling_rate = sensor[n].semi_arbitrated_rate; } sensor[s].sampling_rate = arb_sampling_rate; @@ -820,10 +890,17 @@ static int sensor_set_rate (int s, float requested_rate) ALOGI("Sensor %d (%s) sampling rate set to %g\n", s, sensor[s].friendly_name, arb_sampling_rate); + if (sensor[s].hrtimer_trigger_name[0] != '\0') + sysfs_write_float(hrtimer_sampling_path, ceilf(arb_sampling_rate)); + if (trig_sensors_per_dev[dev_num]) enable_buffer(dev_num, 0); - sysfs_write_float(sysfs_path, arb_sampling_rate); + if (sensor[s].hrtimer_trigger_name[0] != '\0') { + sysfs_write_float(sysfs_path, select_closest_available_rate(s, arb_sampling_rate)); + } else { + sysfs_write_float(sysfs_path, arb_sampling_rate); + } /* Check if it makes sense to use an alternate trigger */ tentative_switch_trigger(s); @@ -843,7 +920,7 @@ static void reapply_sampling_rates (int s) * that ended up being used after arbitration. */ - int i, j, base, user; + int i, j, base; if (sensor[s].is_virtual) { /* Take care of downwards dependencies */ @@ -900,9 +977,11 @@ int sensor_activate (int s, int enabled, int from_virtual) { char device_name[PATH_MAX]; struct epoll_event ev = {0}; - int dev_fd; - int ret; + int dev_fd, event_fd; + int ret, c, d; int dev_num = sensor[s].dev_num; + size_t field_size; + int catalog_index = sensor[s].catalog_index; if (sensor[s].is_virtual) return sensor_activate_virtual(s, enabled, from_virtual); @@ -922,7 +1001,7 @@ int sensor_activate (int s, int enabled, int from_virtual) if (enabled) setup_noise_filtering(s); /* Initialize filtering data if required */ - if (!sensor[s].is_polling) { + if (sensor[s].mode == MODE_TRIGGER) { /* Stop sampling */ enable_buffer(dev_num, 0); @@ -932,9 +1011,17 @@ int sensor_activate (int s, int enabled, int from_virtual) if (trig_sensors_per_dev[dev_num]) { /* Start sampling */ - setup_trigger(s, sensor[s].init_trigger_name); + if (sensor[s].hrtimer_trigger_name[0] != '\0') + setup_trigger(s, sensor[s].hrtimer_trigger_name); + else + setup_trigger(s, sensor[s].init_trigger_name); + enable_buffer(dev_num, 1); } + } else if (sensor[s].mode == MODE_POLL) { + if (sensor[s].needs_enable) { + enable_sensor(dev_num, sensor_catalog[catalog_index].tag, enabled); + } } /* @@ -944,7 +1031,7 @@ int sensor_activate (int s, int enabled, int from_virtual) dev_fd = device_fd[dev_num]; if (!enabled) { - if (sensor[s].is_polling) + if (sensor[s].mode == MODE_POLL) stop_acquisition_thread(s); if (dev_fd != -1 && !poll_sensors_per_dev[dev_num] && !trig_sensors_per_dev[dev_num]) { @@ -955,6 +1042,20 @@ int sensor_activate (int s, int enabled, int from_virtual) device_fd[dev_num] = -1; } + if (sensor[s].mode == MODE_EVENT) { + event_fd = events_fd[dev_num]; + + for (c = 0; c < sensor_catalog[catalog_index].num_channels; c++) { + for (d = 0; d < sensor_catalog[catalog_index].channel[c].num_events; d++) + enable_event(dev_num, sensor_catalog[catalog_index].channel[c].event[d].ev_en_path, enabled); + } + + epoll_ctl(poll_fd, EPOLL_CTL_DEL, event_fd, NULL); + close(event_fd); + events_fd[dev_num] = -1; + + } + /* Release any filtering data we may have accumulated */ release_noise_filtering_data(s); @@ -978,7 +1079,7 @@ int sensor_activate (int s, int enabled, int from_virtual) ALOGV("Opened %s: fd=%d\n", device_name, dev_fd); - if (!sensor[s].is_polling) { + if (sensor[s].mode == MODE_TRIGGER) { /* Add this iio device fd to the set of watched fds */ ev.events = EPOLLIN; @@ -992,13 +1093,47 @@ int sensor_activate (int s, int enabled, int from_virtual) } /* Note: poll-mode fds are not readable */ + } else if (sensor[s].mode == MODE_EVENT) { + event_fd = events_fd[dev_num]; + + ret = ioctl(dev_fd, IIO_GET_EVENT_FD_IOCTL, &event_fd); + if (ret == -1 || event_fd == -1) { + ALOGE("Failed to retrieve event_fd from %d (%s)\n", dev_fd, strerror(errno)); + return -1; + } + events_fd[dev_num] = event_fd; + ALOGV("Opened fd=%d to receive events\n", event_fd); + + /* Add this event fd to the set of watched fds */ + ev.events = EPOLLIN; + ev.data.u32 = dev_num; + + ret = epoll_ctl(poll_fd, EPOLL_CTL_ADD, event_fd, &ev); + if (ret == -1) { + ALOGE("Failed adding %d to poll set (%s)\n", event_fd, strerror(errno)); + return -1; + } + for (c = 0; c < sensor_catalog[catalog_index].num_channels; c++) { + int d; + for (d = 0; d < sensor_catalog[catalog_index].channel[c].num_events; d++) + enable_event(dev_num, sensor_catalog[catalog_index].channel[c].event[d].ev_en_path, enabled); + } + + if (!poll_sensors_per_dev[dev_num] && !trig_sensors_per_dev[dev_num]) { + close(dev_fd); + device_fd[dev_num] = -1; + } } } /* Ensure that on-change sensors send at least one event after enable */ - sensor[s].prev_val = -1; + get_field_count(s, &field_size); + if (field_size == sizeof(uint64_t)) + sensor[s].prev_val.data64 = -1; + else + sensor[s].prev_val.data = -1; - if (sensor[s].is_polling) + if (sensor[s].mode == MODE_POLL) start_acquisition_thread(s); /* Reevaluate sampling rates of linked sensors */ @@ -1063,12 +1198,16 @@ static void stamp_reports (int dev_num, int64_t ts) int s; for (s=0; s= MAX_DEVICES) { - ALOGE("Event reported on unexpected iio device %d\n", dev_num); - return -1; - } - - if (device_fd[dev_num] == -1) { + if (fd == -1) { ALOGE("Ignoring stale report on iio device %d\n", dev_num); return -1; } - len = read(device_fd[dev_num], buf, expected_dev_report_size[dev_num]); + len = read(fd, buf, expected_dev_report_size[dev_num]); if (len == -1) { ALOGE("Could not read report from iio device %d (%s)\n", dev_num, strerror(errno)); @@ -1128,7 +1261,6 @@ static int integrate_device_report (int dev_num) sensor[s].report_pending = DATA_TRIGGER; sensor[s].report_initialized = 1; - ts_offset += sr_offset; } /* Tentatively switch to an any-motion trigger if conditions are met */ @@ -1148,7 +1280,7 @@ static int integrate_device_report (int dev_num) } /* Align on a 64 bits boundary */ - ts_offset = (ts_offset + 7)/8*8; + ts_offset = expected_dev_report_size[dev_num] - sizeof(int64_t); /* If we read an amount of data consistent with timestamp presence */ if (len == expected_dev_report_size[dev_num]) @@ -1169,6 +1301,65 @@ static int integrate_device_report (int dev_num) return 0; } +static int integrate_device_report_from_event(int dev_num, int fd) +{ + int len, s; + int64_t ts; + struct iio_event_data event; + int64_t boot_to_rt_delta = get_timestamp_boot() - get_timestamp_realtime(); + + /* There's an incoming report on the specified iio device char dev fd */ + if (fd == -1) { + ALOGE("Ignoring stale report on event fd %d of device %d\n", + fd, dev_num); + return -1; + } + + len = read(fd, &event, sizeof(event)); + + if (len == -1) { + ALOGE("Could not read event from fd %d of device %d (%s)\n", + fd, dev_num, strerror(errno)); + return -1; + } + + ts = event.timestamp + boot_to_rt_delta; + + ALOGV("Read event %lld from fd %d of iio device %d - ts %lld\n", event.id, fd, dev_num, ts); + + /* Map device report to sensor reports */ + for (s = 0; s < MAX_SENSORS; s++) + if (sensor[s].dev_num == dev_num && + is_enabled(s)) { + sensor[s].event_id = event.id; + sensor[s].report_ts = ts; + sensor[s].report_pending = 1; + sensor[s].report_initialized = 1; + ALOGV("Sensor %d report available (1 byte)\n", s); + } + return 0; +} + +static int integrate_device_report(int dev_num) +{ + int ret = 0; + + if (dev_num < 0 || dev_num >= MAX_DEVICES) { + ALOGE("Event reported on unexpected iio device %d\n", dev_num); + return -1; + } + + if (events_fd[dev_num] != -1) { + ret = integrate_device_report_from_event(dev_num, events_fd[dev_num]); + if (ret < 0) + return ret; + } + + if (device_fd[dev_num] != -1) + ret = integrate_device_report_from_dev(dev_num, device_fd[dev_num]); + + return ret; +} static int propagate_vsensor_report (int s, sensors_event_t *data) { @@ -1177,7 +1368,7 @@ static int propagate_vsensor_report (int s, sensors_event_t *data) memcpy(data, &sensor[s].sample, sizeof(sensors_event_t)); data->sensor = s; - data->type = sensor[s].type; + data->type = sensor_desc[s].type; /* sensor_desc[s].type can differ from sensor[s].type ; internal types are remapped */ return 1; } @@ -1186,7 +1377,8 @@ static int propagate_sensor_report (int s, sensors_event_t *data) { /* There's a sensor report pending for this sensor ; transmit it */ - int num_fields = get_field_count(s); + size_t field_size; + int num_fields = get_field_count(s, &field_size); int c; unsigned char* current_sample; int ret; @@ -1197,7 +1389,7 @@ static int propagate_sensor_report (int s, sensors_event_t *data) ALOGV("Sample on sensor %d (type %d):\n", s, sensor[s].type); - if (sensor[s].is_polling) { + if (sensor[s].mode == MODE_POLL) { /* We received a good sample but we're not directly enabled so we'll drop */ if (!sensor[s].directly_enabled) return 0; @@ -1212,9 +1404,30 @@ static int propagate_sensor_report (int s, sensors_event_t *data) data->version = sizeof(sensors_event_t); data->sensor = s; - data->type = sensor[s].type; + data->type = sensor_desc[s].type; /* sensor_desc[s].type can differ from sensor[s].type ; internal types are remapped */ data->timestamp = sensor[s].report_ts; + if (sensor[s].mode == MODE_EVENT) { + ALOGV("Reporting event\n"); + /* Android requires events to return 1.0 */ + int dir = IIO_EVENT_CODE_EXTRACT_DIR(sensor[s].event_id); + switch (sensor[s].type) { + case SENSOR_TYPE_PROXIMITY: + if (dir == IIO_EV_DIR_FALLING) + data->data[0] = 0.0; + else + data->data[0] = 1.0; + break; + default: + data->data[0] = 1.0; + break; + + } + data->data[1] = 0.0; + data->data[2] = 0.0; + return 1; + } + /* Convert the data into the expected Android-level format */ current_sample = sensor[s].report_buffer; @@ -1345,7 +1558,6 @@ int sensor_poll (sensors_event_t* data, int count) struct epoll_event ev[MAX_DEVICES]; int returned_events; int event_count; - int uncal_start; /* Get one or more events from our collection of sensors */ return_available_sensor_reports: @@ -1421,6 +1633,12 @@ await_event: /* Get report from acquisition thread */ integrate_thread_report(ev[i].data.u32); break; + case FLUSH_REPORT_TAG: + { + char flush_event_content; + read(flush_event_fd[0], &flush_event_content, sizeof(flush_event_content)); + break; + } default: ALOGW("Unexpected event source!\n"); @@ -1460,21 +1678,26 @@ int sensor_set_delay (int s, int64_t ns) int sensor_flush (int s) { + char flush_event_content = 0; /* If one shot or not enabled return -EINVAL */ if (sensor_desc[s].flags & SENSOR_FLAG_ONE_SHOT_MODE || !is_enabled(s)) return -EINVAL; sensor[s].meta_data_pending++; + write(flush_event_fd[1], &flush_event_content, sizeof(flush_event_content)); return 0; } int allocate_control_data (void) { - int i; + int i, ret; + struct epoll_event ev = {0}; - for (i=0; i