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drivers: sensor: ccs811: support triggers

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Add the standard suite of trigger configuration options.  Add driver
support for the DATA_READY and THRESHOLD triggers.  Note cross-module
dependency as configuring the trigger requires a controlled modification
of the sensor registers and the sensor driver API doesn't support this.

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
This commit is contained in:
Peter A. Bigot 2018-11-21 14:35:01 -06:00 • committed by Maureen Helm
commit 403a7ab2c5
5 changed files with 373 additions and 41 deletions
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177
drivers/sensor/ccs811/ccs811_trigger.c Normal file
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/*
* Copyright (c) 2018 Peter Bigot Consulting, LLC
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <sensor.h>
#include "ccs811.h"
#define LOG_LEVEL CONFIG_SENSOR_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_DECLARE(CCS811);
int ccs811_attr_set(struct device *dev,
enum sensor_channel chan,
enum sensor_attribute attr,
const struct sensor_value *thr)
{
struct ccs811_data *drv_data = dev->driver_data;
int rc;
if (chan != SENSOR_CHAN_CO2) {
rc = -ENOTSUP;
} else if (attr == SENSOR_ATTR_LOWER_THRESH) {
rc = -EINVAL;
if ((thr->val1 >= CCS811_CO2_MIN_PPM)
&& (thr->val1 <= CCS811_CO2_MAX_PPM)) {
drv_data->co2_l2m = thr->val1;
rc = 0;
}
} else if (attr == SENSOR_ATTR_UPPER_THRESH) {
rc = -EINVAL;
if ((thr->val1 >= CCS811_CO2_MIN_PPM)
&& (thr->val1 <= CCS811_CO2_MAX_PPM)) {
drv_data->co2_m2h = thr->val1;
rc = 0;
}
} else {
rc = -ENOTSUP;
}
return rc;
}
static void gpio_callback(struct device *dev,
struct gpio_callback *cb,
u32_t pins)
{
struct ccs811_data *drv_data =
CONTAINER_OF(cb, struct ccs811_data, gpio_cb);
ARG_UNUSED(pins);
gpio_pin_disable_callback(dev, DT_INST_0_AMS_CCS811_IRQ_GPIOS_PIN);
#if defined(CONFIG_CCS811_TRIGGER_OWN_THREAD)
k_sem_give(&drv_data->gpio_sem);
#elif defined(CONFIG_CCS811_TRIGGER_GLOBAL_THREAD)
k_work_submit(&drv_data->work);
#else
#error Unhandled trigger configuration
#endif
}
static void thread_cb(void *arg)
{
struct device *dev = arg;
struct ccs811_data *drv_data = dev->driver_data;
if (drv_data->handler != NULL) {
drv_data->handler(dev, &drv_data->trigger);
}
gpio_pin_enable_callback(drv_data->int_gpio, DT_INST_0_AMS_CCS811_IRQ_GPIOS_PIN);
}
#ifdef CONFIG_CCS811_TRIGGER_OWN_THREAD
static void datardy_thread(int dev_ptr, int unused)
{
struct device *dev = INT_TO_POINTER(dev_ptr);
struct ccs811_data *drv_data = dev->driver_data;
ARG_UNUSED(unused);
while (1) {
k_sem_take(&drv_data->gpio_sem, K_FOREVER);
thread_cb(dev);
}
}
#elif defined(CONFIG_CCS811_TRIGGER_GLOBAL_THREAD)
static void work_cb(struct k_work *work)
{
struct ccs811_data *drv_data =
CONTAINER_OF(work, struct ccs811_data, work);
thread_cb(drv_data->dev);
}
#else
#error Unhandled trigger configuration
#endif
int ccs811_trigger_set(struct device *dev,
const struct sensor_trigger *trig,
sensor_trigger_handler_t handler)
{
struct ccs811_data *drv_data = dev->driver_data;
u8_t drdy_thresh = CCS811_MODE_THRESH | CCS811_MODE_DATARDY;
int rc;
LOG_DBG("CCS811 trigger set");
gpio_pin_disable_callback(drv_data->int_gpio, DT_INST_0_AMS_CCS811_IRQ_GPIOS_PIN);
if (trig->type == SENSOR_TRIG_DATA_READY) {
rc = ccs811_mutate_meas_mode(dev, CCS811_MODE_DATARDY,
CCS811_MODE_THRESH);
} else if (trig->type == SENSOR_TRIG_THRESHOLD) {
rc = -EINVAL;
if ((drv_data->co2_l2m >= CCS811_CO2_MIN_PPM)
&& (drv_data->co2_l2m <= CCS811_CO2_MAX_PPM)
&& (drv_data->co2_m2h >= CCS811_CO2_MIN_PPM)
&& (drv_data->co2_m2h <= CCS811_CO2_MAX_PPM)
&& (drv_data->co2_l2m <= drv_data->co2_m2h)) {
rc = ccs811_set_thresholds(dev);
}
if (rc == 0) {
rc = ccs811_mutate_meas_mode(dev, drdy_thresh, 0);
}
} else {
rc = -ENOTSUP;
}
if (rc == 0) {
drv_data->handler = handler;
drv_data->trigger = *trig;
gpio_pin_enable_callback(drv_data->int_gpio,
DT_INST_0_AMS_CCS811_IRQ_GPIOS_PIN);
} else {
(void)ccs811_mutate_meas_mode(dev, 0, drdy_thresh);
}
return rc;
}
int ccs811_init_interrupt(struct device *dev)
{
struct ccs811_data *drv_data = dev->driver_data;
#ifndef DT_INST_0_AMS_CCS811_IRQ_GPIOS_PIN
return -EINVAL;
#endif
gpio_pin_configure(drv_data->int_gpio, DT_INST_0_AMS_CCS811_IRQ_GPIOS_PIN,
GPIO_DIR_IN | GPIO_INT | GPIO_INT_LEVEL |
GPIO_INT_ACTIVE_LOW | GPIO_PUD_PULL_UP |
GPIO_INT_DEBOUNCE);
gpio_init_callback(&drv_data->gpio_cb, gpio_callback,
BIT(DT_INST_0_AMS_CCS811_IRQ_GPIOS_PIN));
if (gpio_add_callback(drv_data->int_gpio, &drv_data->gpio_cb) < 0) {
LOG_DBG("Failed to set gpio callback!");
return -EIO;
}
#if defined(CONFIG_CCS811_TRIGGER_OWN_THREAD)
k_sem_init(&drv_data->gpio_sem, 0, UINT_MAX);
k_thread_create(&drv_data->thread, drv_data->thread_stack,
CONFIG_CCS811_THREAD_STACK_SIZE,
(k_thread_entry_t)datardy_thread, dev,
0, NULL, K_PRIO_COOP(CONFIG_CCS811_THREAD_PRIORITY),
0, 0);
#elif defined(CONFIG_CCS811_TRIGGER_GLOBAL_THREAD)
drv_data->work.handler = work_cb;
drv_data->dev = dev;
#else
#error Unhandled trigger configuration
#endif
return 0;
}