diff options
| author | Javier Carrasco <javier.carrasco.cruz@gmail.com> | 2024-03-04 00:54:22 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2024-03-25 23:10:13 +0300 |
| commit | e264b086f40a3d74a405227db8b624b4b15906e0 (patch) | |
| tree | ed8dfb65af7052d54942bcc1667b36277381448b /drivers/iio/humidity/hdc3020.c | |
| parent | 137166ef5fc5a10fbc7bceee20d770e6a930f4cc (diff) | |
| download | linux-e264b086f40a3d74a405227db8b624b4b15906e0.tar.xz | |
iio: humidity: hdc3020: add reset management
The HDC3020 provides an active low reset signal that must be handled if
connected. Asserting this signal turns the device into Trigger-on Demand
measurement mode, reducing its power consumption when no measurements
are required like in low-power modes.
According to the datasheet, the longest "Reset Ready" is 3 ms, which is
only taken into account if the reset signal is defined.
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20240303-hdc3020-pm-v3-3-48bc02b5241b@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/humidity/hdc3020.c')
| -rw-r--r-- | drivers/iio/humidity/hdc3020.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/iio/humidity/hdc3020.c b/drivers/iio/humidity/hdc3020.c index 7f93024b850c..cdc4789213ba 100644 --- a/drivers/iio/humidity/hdc3020.c +++ b/drivers/iio/humidity/hdc3020.c @@ -15,6 +15,7 @@ #include <linux/cleanup.h> #include <linux/crc8.h> #include <linux/delay.h> +#include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/interrupt.h> @@ -70,6 +71,7 @@ struct hdc3020_data { struct i2c_client *client; + struct gpio_desc *reset_gpio; struct regulator *vdd_supply; /* * Ensure that the sensor configuration (currently only heater is @@ -558,6 +560,9 @@ static int hdc3020_power_off(struct hdc3020_data *data) { hdc3020_exec_cmd(data, HDC3020_EXIT_AUTO); + if (data->reset_gpio) + gpiod_set_value_cansleep(data->reset_gpio, 1); + return regulator_disable(data->vdd_supply); } @@ -571,6 +576,11 @@ static int hdc3020_power_on(struct hdc3020_data *data) fsleep(5000); + if (data->reset_gpio) { + gpiod_set_value_cansleep(data->reset_gpio, 0); + fsleep(3000); + } + if (data->client->irq) { /* * The alert output is activated by default upon power up, @@ -627,6 +637,12 @@ static int hdc3020_probe(struct i2c_client *client) return dev_err_probe(&client->dev, PTR_ERR(data->vdd_supply), "Unable to get VDD regulator\n"); + data->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(data->reset_gpio)) + return dev_err_probe(&client->dev, PTR_ERR(data->reset_gpio), + "Cannot get reset GPIO\n"); + ret = hdc3020_power_on(data); if (ret) return dev_err_probe(&client->dev, ret, "Power on failed\n"); |