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sensors: ccs811: Deassert the reset pin with GPIO

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The driver releases the sensor from reset in case the reset pin is
driven by a GPIO.

Signed-off-by: Aapo Vienamo <aapo.vienamo@iki.fi>
This commit is contained in:
Aapo Vienamo 2018-03-15 18:16:38 +02:00 • committed by Kumar Gala
commit fbd3c2f4e2
2 changed files with 32 additions and 5 deletions
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20
drivers/sensor/ccs811/ccs811.c
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@ -162,18 +162,28 @@ int ccs811_init(struct device *dev)
return -EINVAL;
}
/*
* Wakeup pin should be pulled low before initiating any I2C transfer.
* If it has been tied to GND by default, skip this part.
*/
#ifdef CONFIG_CCS811_GPIO_WAKEUP
#if defined(CONFIG_CCS811_GPIO_WAKEUP) || defined(CONFIG_CCS811_GPIO_RESET)
drv_data->gpio = device_get_binding(CONFIG_CCS811_GPIO_DEV_NAME);
if (drv_data->gpio == NULL) {
SYS_LOG_ERR("Failed to get pointer to %s device!",
CONFIG_CCS811_GPIO_DEV_NAME);
return -EINVAL;
}
#endif
#ifdef CONFIG_CCS811_GPIO_RESET
gpio_pin_configure(drv_data->gpio, CONFIG_CCS811_GPIO_RESET_PIN_NUM,
GPIO_DIR_OUT);
gpio_pin_write(drv_data->gpio, CONFIG_CCS811_GPIO_RESET_PIN_NUM, 1);
k_sleep(1);
#endif
/*
* Wakeup pin should be pulled low before initiating any I2C transfer.
* If it has been tied to GND by default, skip this part.
*/
#ifdef CONFIG_CCS811_GPIO_WAKEUP
gpio_pin_configure(drv_data->gpio, CONFIG_CCS811_GPIO_WAKEUP_PIN_NUM,
GPIO_DIR_OUT);
gpio_pin_write(drv_data->gpio, CONFIG_CCS811_GPIO_WAKEUP_PIN_NUM, 0);