SMDK4x12 Sensors

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>

1 files changed, 265 insertions, 0 deletions

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 <contact@paulk.fr>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <hardware/sensors.h>
+#include <hardware/hardware.h>
+
+#define LOG_TAG "smdk4x12_sensors"
+#include <utils/Log.h>
+
+#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,
+};