From ac135b66fb258b669dbcf4608a9ea7f386c00386 Mon Sep 17 00:00:00 2001 From: Paul Kocialkowski Date: Tue, 14 Jan 2014 15:57:09 +0100 Subject: SMDK4x12 Sensors Signed-off-by: Paul Kocialkowski --- sensors/lsm330dlc_acceleration.c | 265 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 265 insertions(+) create mode 100644 sensors/lsm330dlc_acceleration.c (limited to 'sensors/lsm330dlc_acceleration.c') diff --git a/sensors/lsm330dlc_acceleration.c b/sensors/lsm330dlc_acceleration.c new file mode 100644 index 0000000..efb0388 --- /dev/null +++ b/sensors/lsm330dlc_acceleration.c @@ -0,0 +1,265 @@ +/* + * Copyright (C) 2013 Paul Kocialkowski + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include +#include +#include +#include + +#include +#include + +#define LOG_TAG "smdk4x12_sensors" +#include + +#include "smdk4x12_sensors.h" +#include "ssp.h" + +struct lsm330dlc_acceleration_data { + struct smdk4x12_sensors_handlers *orientation_sensor; + + char path_delay[PATH_MAX]; + + sensors_vec_t acceleration; +}; + +int lsm330dlc_acceleration_init(struct smdk4x12_sensors_handlers *handlers, + struct smdk4x12_sensors_device *device) +{ + struct lsm330dlc_acceleration_data *data = NULL; + char path[PATH_MAX] = { 0 }; + int input_fd = -1; + int rc; + int i; + + ALOGD("%s(%p, %p)", __func__, handlers, device); + + if (handlers == NULL) + return -EINVAL; + + data = (struct lsm330dlc_acceleration_data *) calloc(1, sizeof(struct lsm330dlc_acceleration_data)); + + for (i = 0; i < device->handlers_count; i++) { + if (device->handlers[i] == NULL) + continue; + + if (device->handlers[i]->handle == SENSOR_TYPE_ORIENTATION) + data->orientation_sensor = device->handlers[i]; + } + + input_fd = input_open("accelerometer_sensor"); + if (input_fd < 0) { + ALOGE("%s: Unable to open input", __func__); + goto error; + } + + rc = sysfs_path_prefix("accelerometer_sensor", (char *) &path); + if (rc < 0 || path[0] == '\0') { + ALOGE("%s: Unable to open sysfs", __func__); + goto error; + } + + snprintf(data->path_delay, PATH_MAX, "%s/acc_poll_delay", path); + + handlers->poll_fd = input_fd; + handlers->data = (void *) data; + + return 0; + +error: + if (data != NULL) + free(data); + + if (input_fd >= 0) + close(input_fd); + + handlers->poll_fd = -1; + handlers->data = NULL; + + return -1; +} + +int lsm330dlc_acceleration_deinit(struct smdk4x12_sensors_handlers *handlers) +{ + ALOGD("%s(%p)", __func__, handlers); + + if (handlers == NULL) + return -EINVAL; + + if (handlers->poll_fd >= 0) + close(handlers->poll_fd); + handlers->poll_fd = -1; + + if (handlers->data != NULL) + free(handlers->data); + handlers->data = NULL; + + return 0; +} + +int lsm330dlc_acceleration_activate(struct smdk4x12_sensors_handlers *handlers) +{ + struct lsm330dlc_acceleration_data *data; + int rc; + + ALOGD("%s(%p)", __func__, handlers); + + if (handlers == NULL || handlers->data == NULL) + return -EINVAL; + + data = (struct lsm330dlc_acceleration_data *) handlers->data; + + rc = ssp_sensor_enable(ACCELEROMETER_SENSOR); + if (rc < 0) { + ALOGE("%s: Unable to enable ssp sensor", __func__); + return -1; + } + + handlers->activated = 1; + + return 0; +} + +int lsm330dlc_acceleration_deactivate(struct smdk4x12_sensors_handlers *handlers) +{ + struct lsm330dlc_acceleration_data *data; + int rc; + + ALOGD("%s(%p)", __func__, handlers); + + if (handlers == NULL || handlers->data == NULL) + return -EINVAL; + + data = (struct lsm330dlc_acceleration_data *) handlers->data; + + rc = ssp_sensor_disable(ACCELEROMETER_SENSOR); + if (rc < 0) { + ALOGE("%s: Unable to disable ssp sensor", __func__); + return -1; + } + + handlers->activated = 0; + + return 0; +} + +int lsm330dlc_acceleration_set_delay(struct smdk4x12_sensors_handlers *handlers, long int delay) +{ + struct lsm330dlc_acceleration_data *data; + int rc; + + ALOGD("%s(%p, %ld)", __func__, handlers, delay); + + if (handlers == NULL || handlers->data == NULL) + return -EINVAL; + + data = (struct lsm330dlc_acceleration_data *) handlers->data; + + rc = sysfs_value_write(data->path_delay, (int) delay); + if (rc < 0) { + ALOGE("%s: Unable to write sysfs value", __func__); + return -1; + } + + return 0; +} + +float lsm330dlc_acceleration_convert(int value) +{ + return (float) value * (GRAVITY_EARTH / 1024.0f); +} + +int lsm330dlc_acceleration_get_data(struct smdk4x12_sensors_handlers *handlers, + struct sensors_event_t *event) +{ + struct lsm330dlc_acceleration_data *data; + struct input_event input_event; + int input_fd; + int rc; + +// ALOGD("%s(%p, %p)", __func__, handlers, event); + + if (handlers == NULL || handlers->data == NULL || event == NULL) + return -EINVAL; + + data = (struct lsm330dlc_acceleration_data *) handlers->data; + + input_fd = handlers->poll_fd; + if (input_fd < 0) + return -1; + + memset(event, 0, sizeof(struct sensors_event_t)); + event->version = sizeof(struct sensors_event_t); + event->sensor = handlers->handle; + event->type = handlers->handle; + + event->acceleration.x = data->acceleration.x; + event->acceleration.y = data->acceleration.y; + event->acceleration.z = data->acceleration.z; + + event->magnetic.status = SENSOR_STATUS_ACCURACY_MEDIUM; + + do { + rc = read(input_fd, &input_event, sizeof(input_event)); + if (rc < (int) sizeof(input_event)) + break; + + if (input_event.type == EV_REL) { + switch (input_event.code) { + case REL_X: + event->acceleration.x = lsm330dlc_acceleration_convert(input_event.value); + break; + case REL_Y: + event->acceleration.y = lsm330dlc_acceleration_convert(input_event.value); + break; + case REL_Z: + event->acceleration.z = lsm330dlc_acceleration_convert(input_event.value); + break; + default: + continue; + } + } else if (input_event.type == EV_SYN) { + if (input_event.code == SYN_REPORT) + event->timestamp = input_timestamp(&input_event); + } + } while (input_event.type != EV_SYN); + + data->acceleration.x = event->acceleration.x; + data->acceleration.y = event->acceleration.y; + data->acceleration.z = event->acceleration.z; + + if (data->orientation_sensor != NULL) + orientation_fill(data->orientation_sensor, &event->acceleration, NULL); + + return 0; +} + +struct smdk4x12_sensors_handlers lsm330dlc_acceleration = { + .name = "LSM330DLC Acceleration", + .handle = SENSOR_TYPE_ACCELEROMETER, + .init = lsm330dlc_acceleration_init, + .deinit = lsm330dlc_acceleration_deinit, + .activate = lsm330dlc_acceleration_activate, + .deactivate = lsm330dlc_acceleration_deactivate, + .set_delay = lsm330dlc_acceleration_set_delay, + .get_data = lsm330dlc_acceleration_get_data, + .activated = 0, + .needed = 0, + .poll_fd = -1, + .data = NULL, +}; -- cgit v1.1