drivers: sensor: ccs811: support triggers
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
Maureen Helm
parent
29c5f30ed2
commit
403a7ab2c5
5 changed files with 373 additions and 41 deletions
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@ -23,7 +23,7 @@ LOG_MODULE_REGISTER(CCS811, CONFIG_SENSOR_LOG_LEVEL);
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static void set_wake(struct ccs811_data *drv_data, bool enable)
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{
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/* Always active-low */
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gpio_pin_write(drv_data->gpio, DT_INST_0_AMS_CCS811_WAKE_GPIOS_PIN, !enable);
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gpio_pin_write(drv_data->wake_gpio, DT_INST_0_AMS_CCS811_WAKE_GPIOS_PIN, !enable);
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if (enable) {
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k_busy_wait(50); /* t_WAKE = 50 us */
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} else {
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@ -170,6 +170,10 @@ static int ccs811_channel_get(struct device *dev,
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}
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static const struct sensor_driver_api ccs811_driver_api = {
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#ifdef CONFIG_CCS811_TRIGGER
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.attr_set = ccs811_attr_set,
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.trigger_set = ccs811_trigger_set,
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#endif
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.sample_fetch = ccs811_sample_fetch,
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.channel_get = ccs811_channel_get,
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};
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@ -222,6 +226,65 @@ static int switch_to_app_mode(struct device *i2c)
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return 0;
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}
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#ifdef CONFIG_CCS811_TRIGGER
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int ccs811_mutate_meas_mode(struct device *dev,
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u8_t set,
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u8_t clear)
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{
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struct ccs811_data *drv_data = dev->driver_data;
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int rc = 0;
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u8_t mode = set | (drv_data->mode & ~clear);
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/*
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* Changing drive mode of a running system has preconditions.
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* Only allow changing the interrupt generation.
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*/
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if ((set | clear) & ~(CCS811_MODE_DATARDY | CCS811_MODE_THRESH)) {
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return -EINVAL;
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}
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if (mode != drv_data->mode) {
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set_wake(drv_data, true);
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rc = i2c_reg_write_byte(drv_data->i2c, DT_INST_0_AMS_CCS811_BASE_ADDRESS,
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CCS811_REG_MEAS_MODE,
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mode);
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LOG_DBG("CCS811 meas mode change %02x to %02x got %d",
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drv_data->mode, mode, rc);
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if (rc < 0) {
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LOG_ERR("Failed to set mode");
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rc = -EIO;
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} else {
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drv_data->mode = mode;
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rc = 0;
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}
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set_wake(drv_data, false);
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}
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return rc;
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}
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int ccs811_set_thresholds(struct device *dev)
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{
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struct ccs811_data *drv_data = dev->driver_data;
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const u8_t buf[5] = {
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CCS811_REG_THRESHOLDS,
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drv_data->co2_l2m >> 8,
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drv_data->co2_l2m,
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drv_data->co2_m2h >> 8,
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drv_data->co2_m2h,
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};
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int rc;
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set_wake(drv_data, true);
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rc = i2c_write(drv_data->i2c, buf, sizeof(buf), DT_INST_0_AMS_CCS811_BASE_ADDRESS);
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set_wake(drv_data, false);
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return rc;
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}
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#endif /* CONFIG_CCS811_TRIGGER */
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int ccs811_init(struct device *dev)
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{
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struct ccs811_data *drv_data = dev->driver_data;
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@ -229,6 +292,7 @@ int ccs811_init(struct device *dev)
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u8_t hw_id;
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int status;
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*drv_data = (struct ccs811_data){ 0 };
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drv_data->i2c = device_get_binding(DT_INST_0_AMS_CCS811_BUS_NAME);
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if (drv_data->i2c == NULL) {
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LOG_ERR("Failed to get pointer to %s device!",
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@ -236,65 +300,56 @@ int ccs811_init(struct device *dev)
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return -EINVAL;
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}
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struct device *gpio = NULL;
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(void)gpio;
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#ifdef DT_INST_0_AMS_CCS811_WAKE_GPIOS_CONTROLLER
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gpio = device_get_binding(DT_INST_0_AMS_CCS811_WAKE_GPIOS_CONTROLLER);
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if (gpio == NULL) {
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drv_data->wake_gpio = device_get_binding(DT_INST_0_AMS_CCS811_WAKE_GPIOS_CONTROLLER);
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if (drv_data->wake_gpio == NULL) {
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LOG_ERR("Failed to get pointer to WAKE device: %s",
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DT_INST_0_AMS_CCS811_WAKE_GPIOS_CONTROLLER);
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return -EINVAL;
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}
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drv_data->gpio = gpio;
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/*
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* Wakeup pin should be pulled low before initiating
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* any I2C transfer. If it has been tied to GND by
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* default, skip this part.
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*/
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gpio_pin_configure(drv_data->wake_gpio, DT_INST_0_AMS_CCS811_WAKE_GPIOS_PIN,
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GPIO_DIR_OUT);
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set_wake(drv_data, true);
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k_sleep(1);
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#endif
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#ifdef DT_INST_0_AMS_CCS811_RESET_GPIOS_CONTROLLER
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gpio = device_get_binding(DT_INST_0_AMS_CCS811_RESET_GPIOS_CONTROLLER);
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if (gpio == NULL) {
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drv_data->reset_gpio = device_get_binding(DT_INST_0_AMS_CCS811_RESET_GPIOS_CONTROLLER);
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if (drv_data->reset_gpio == NULL) {
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LOG_ERR("Failed to get pointer to RESET device: %s",
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DT_INST_0_AMS_CCS811_RESET_GPIOS_CONTROLLER);
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return -EINVAL;
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}
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gpio_pin_configure(drv_data->reset_gpio, DT_INST_0_AMS_CCS811_RESET_GPIOS_PIN,
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GPIO_DIR_OUT);
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gpio_pin_write(drv_data->reset_gpio, DT_INST_0_AMS_CCS811_RESET_GPIOS_PIN, 1);
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if (drv_data->gpio == NULL) {
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drv_data->gpio = gpio;
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} else if (drv_data->gpio != gpio) {
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LOG_ERR("Crossing GPIO devices not supported");
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k_sleep(1);
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#endif
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#ifdef DT_INST_0_AMS_CCS811_IRQ_GPIOS_CONTROLLER
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drv_data->int_gpio = device_get_binding(DT_INST_0_AMS_CCS811_IRQ_GPIOS_CONTROLLER);
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if (drv_data->int_gpio == NULL) {
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LOG_ERR("Failed to get pointer to INT device: %s",
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DT_INST_0_AMS_CCS811_IRQ_GPIOS_CONTROLLER);
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return -EINVAL;
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}
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#endif
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if (drv_data->gpio) {
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#ifdef DT_INST_0_AMS_CCS811_RESET_GPIOS_PIN
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gpio_pin_configure(drv_data->gpio, DT_INST_0_AMS_CCS811_RESET_GPIOS_PIN,
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GPIO_DIR_OUT);
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gpio_pin_write(drv_data->gpio, DT_INST_0_AMS_CCS811_RESET_GPIOS_PIN, 1);
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k_sleep(K_MSEC(1));
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#endif
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/*
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* Wakeup pin should be pulled low before initiating
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* any I2C transfer. If it has been tied to GND by
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* default, skip this part.
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*/
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#ifdef DT_INST_0_AMS_CCS811_WAKE_GPIOS_PIN
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gpio_pin_configure(drv_data->gpio, DT_INST_0_AMS_CCS811_WAKE_GPIOS_PIN,
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GPIO_DIR_OUT);
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set_wake(drv_data, true);
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k_sleep(K_MSEC(1));
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#endif
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}
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/* Reset the device. This saves having to deal with detecting
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* and validating any errors or configuration inconsistencies
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* after a reset that left the device running.
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*/
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#ifdef DT_INST_0_AMS_CCS811_RESET_GPIOS_PIN
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gpio_pin_write(drv_data->gpio, DT_INST_0_AMS_CCS811_RESET_GPIOS_PIN, 0);
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k_busy_wait(15); /* t_RESET */
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gpio_pin_write(drv_data->gpio, DT_INST_0_AMS_CCS811_RESET_GPIOS_PIN, 1);
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gpio_pin_write(drv_data->reset_gpio, DT_INST_0_AMS_CCS811_RESET_GPIOS_PIN, 0);
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k_busy_wait(15); /* t_RESET */
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gpio_pin_write(drv_data->reset_gpio, DT_INST_0_AMS_CCS811_RESET_GPIOS_PIN, 1);
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#else
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{
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static u8_t const reset_seq[] = {
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@ -347,6 +402,7 @@ int ccs811_init(struct device *dev)
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ret = -EIO;
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goto out;
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}
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drv_data->mode = meas_mode;
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/* Check for error */
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status = fetch_status(drv_data->i2c);
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@ -362,6 +418,11 @@ int ccs811_init(struct device *dev)
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goto out;
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}
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#ifdef CONFIG_CCS811_TRIGGER
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ret = ccs811_init_interrupt(dev);
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LOG_DBG("CCS811 interrupt init got %d", ret);
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#endif
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out:
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set_wake(drv_data, false);
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return ret;
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