From 0c2e6b3feb59560333e7d4e0b1ff24e83c26ccb4 Mon Sep 17 00:00:00 2001 From: Paul Kocialkowski Date: Mon, 25 Feb 2013 19:40:48 +0100 Subject: Piranha Sensors module and geomagneticd Signed-off-by: Paul Kocialkowski --- sensors/bh1721.c | 241 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 241 insertions(+) create mode 100644 sensors/bh1721.c (limited to 'sensors/bh1721.c') diff --git a/sensors/bh1721.c b/sensors/bh1721.c new file mode 100644 index 0000000..6b0e76e --- /dev/null +++ b/sensors/bh1721.c @@ -0,0 +1,241 @@ +/* + * 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 + +#include +#include + +#define LOG_TAG "piranha_sensors" +#include + +#include "piranha_sensors.h" + +struct bh1721_data { + char path_enable[PATH_MAX]; + char path_delay[PATH_MAX]; +}; + +int bh1721_init(struct piranha_sensors_handlers *handlers, struct piranha_sensors_device *device) +{ + struct bh1721_data *data = NULL; + char path[PATH_MAX] = { 0 }; + int input_fd = -1; + int rc; + + LOGD("%s(%p, %p)", __func__, handlers, device); + + if (handlers == NULL) + return -EINVAL; + + input_fd = input_open("light_sensor"); + if (input_fd < 0) { + LOGE("%s: Unable to open input", __func__); + goto error; + } + + rc = sysfs_path_prefix("light_sensor", (char *) &path); + if (rc < 0 || path[0] == '\0') { + LOGE("%s: Unable to open sysfs", __func__); + goto error; + } + + data = (struct bh1721_data *) calloc(1, sizeof(struct bh1721_data)); + + snprintf(data->path_enable, PATH_MAX, "%s/enable", path); + snprintf(data->path_delay, PATH_MAX, "%s/poll_delay", path); + + handlers->poll_fd = input_fd; + handlers->data = (void *) data; + + return 0; + +error: + if (input_fd >= 0) + close(input_fd); + + if (data != NULL) + free(data); + + handlers->poll_fd = -1; + handlers->data = NULL; + + return -1; +} + +int bh1721_deinit(struct piranha_sensors_handlers *handlers) +{ + int input_fd; + + LOGD("%s(%p)", __func__, handlers); + + if (handlers == NULL) + return -EINVAL; + + input_fd = handlers->poll_fd; + if (input_fd >= 0) + close(input_fd); + + handlers->poll_fd = -1; + + if (handlers->data != NULL) + free(handlers->data); + + handlers->data = NULL; + + return 0; +} + +int bh1721_activate(struct piranha_sensors_handlers *handlers) +{ + struct bh1721_data *data; + char enable[] = "1\n"; + int fd; + + LOGD("%s(%p)", __func__, handlers); + + if (handlers == NULL || handlers->data == NULL) + return -EINVAL; + + data = (struct bh1721_data *) handlers->data; + + fd = open(data->path_enable, O_WRONLY); + if (fd < 0) { + LOGE("%s: Unable to open enable path", __func__); + return -1; + } + + write(fd, &enable, sizeof(enable)); + close(fd); + + handlers->activated = 1; + + return 0; +} + +int bh1721_deactivate(struct piranha_sensors_handlers *handlers) +{ + struct bh1721_data *data; + char enable[] = "0\n"; + int fd; + + LOGD("%s(%p)", __func__, handlers); + + if (handlers == NULL || handlers->data == NULL) + return -EINVAL; + + data = (struct bh1721_data *) handlers->data; + + fd = open(data->path_enable, O_WRONLY); + if (fd < 0) { + LOGE("%s: Unable to open enable path", __func__); + return -1; + } + + write(fd, &enable, sizeof(enable)); + close(fd); + + handlers->activated = 0; + + return 0; +} + +int bh1721_set_delay(struct piranha_sensors_handlers *handlers, int64_t delay) +{ + struct bh1721_data *data; + char *value = NULL; + int c; + int fd; + +// LOGD("%s(%p, %ld)", __func__, handlers, (long int) delay); + + if (handlers == NULL || handlers->data == NULL) + return -EINVAL; + + data = (struct bh1721_data *) handlers->data; + + c = asprintf(&value, "%ld\n", (long int) delay); + + fd = open(data->path_delay, O_WRONLY); + if (fd < 0) { + LOGE("%s: Unable to open delay path", __func__); + return -1; + } + + write(fd, value, c); + close(fd); + + if (value != NULL) + free(value); + + return 0; +} + +float bh1721_light(int value) +{ + return (float) value * 0.712f; +} + +int bh1721_get_data(struct piranha_sensors_handlers *handlers, + struct sensors_event_t *event) +{ + struct input_event input_event; + int input_fd; + int rc; + + if (handlers == NULL || event == NULL) + return -EINVAL; + + input_fd = handlers->poll_fd; + if (input_fd < 0) + return -EINVAL; + + rc = read(input_fd, &input_event, sizeof(input_event)); + if (rc < (int) sizeof(input_event)) + return -EINVAL; + + if (input_event.type != EV_ABS || input_event.code != ABS_MISC) + return -1; + + event->version = sizeof(struct sensors_event_t); + event->sensor = handlers->handle; + event->type = handlers->handle; + event->timestamp = input_timestamp(&input_event); + event->light = bh1721_light(input_event.value); + + return 0; +} + +struct piranha_sensors_handlers bh1721 = { + .name = "BH1721", + .handle = SENSOR_TYPE_LIGHT, + .init = bh1721_init, + .deinit = bh1721_deinit, + .activate = bh1721_activate, + .deactivate = bh1721_deactivate, + .set_delay = bh1721_set_delay, + .get_data = bh1721_get_data, + .activated = 0, + .poll_fd = -1, + .data = NULL, +}; -- cgit v1.1