sensor: sht4x: add device power management support
Registers driver with pm_device_driver_init(). Peform software reset on TURN_ON. Added a small delay after power-up Signed-off-by: Van Petrosyan <van.petrosyan@sensirion.com>
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936d0278bd
commit
8d2010e1e1
2 changed files with 41 additions and 10 deletions
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@ -9,6 +9,7 @@
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#include <zephyr/device.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/kernel.h>
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#include <zephyr/pm/device.h>
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#include <zephyr/drivers/sensor.h>
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#include <zephyr/sys/__assert.h>
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#include <zephyr/logging/log.h>
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@ -180,15 +181,12 @@ static int sht4x_attr_set(const struct device *dev,
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return 0;
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}
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static int sht4x_init(const struct device *dev)
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static int sht4x_init_chip(const struct device *dev)
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{
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const struct sht4x_config *cfg = dev->config;
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int rc = 0;
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int rc;
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if (!device_is_ready(cfg->bus.bus)) {
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LOG_ERR("Device not ready.");
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return -ENODEV;
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}
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/* 1 ms (max) power up time according to datasheet */
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k_sleep(K_MSEC(SHT4X_POR_WAIT_MS));
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rc = sht4x_write_command(dev, SHT4X_CMD_RESET);
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if (rc < 0) {
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@ -197,10 +195,42 @@ static int sht4x_init(const struct device *dev)
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}
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k_sleep(K_MSEC(SHT4X_RESET_WAIT_MS));
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return 0;
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}
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static int sht4x_pm_action(const struct device *dev, enum pm_device_action action)
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{
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int rc = 0;
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switch (action) {
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case PM_DEVICE_ACTION_TURN_ON:
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rc = sht4x_init_chip(dev);
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break;
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case PM_DEVICE_ACTION_RESUME:
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case PM_DEVICE_ACTION_SUSPEND:
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case PM_DEVICE_ACTION_TURN_OFF:
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break;
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default:
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return -ENOTSUP;
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}
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return rc;
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}
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static int sht4x_init(const struct device *dev)
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{
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const struct sht4x_config *cfg = dev->config;
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if (!device_is_ready(cfg->bus.bus)) {
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LOG_ERR("Device not ready.");
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return -ENODEV;
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}
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return pm_device_driver_init(dev, sht4x_pm_action);
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}
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static DEVICE_API(sensor, sht4x_api) = {
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.sample_fetch = sht4x_sample_fetch,
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@ -215,10 +245,10 @@ static DEVICE_API(sensor, sht4x_api) = {
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.bus = I2C_DT_SPEC_INST_GET(n), \
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.repeatability = DT_INST_PROP(n, repeatability) \
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}; \
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\
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PM_DEVICE_DT_INST_DEFINE(n, sht4x_pm_action); \
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SENSOR_DEVICE_DT_INST_DEFINE(n, \
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sht4x_init, \
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NULL, \
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PM_DEVICE_DT_INST_GET(n), \
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&sht4x_data_##n, \
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&sht4x_config_##n, \
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POST_KERNEL, \
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@ -13,6 +13,7 @@
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#define SHT4X_CMD_RESET 0x94
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#define SHT4X_RESET_WAIT_MS 1
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#define SHT4X_POR_WAIT_MS 1
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#define SHT4X_HEATER_POWER_IDX_MAX 3
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#define SHT4X_HEATER_DURATION_IDX_MAX 2
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