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Commit c5842b47 authored by Linus Walleij's avatar Linus Walleij Committed by Jonathan Cameron
Browse files

iio: pressure: bmp280: add reset GPIO line handling 



On the APQ8060 Dragonboard the reset line to the BMP085 pressure
sensor is not deasserted on boot, so the driver needs to handle
this. For a simple GPIO line supplied as a descriptor (from a board
file, device tree or ACPI) this does the trick.

Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 78f50271

drivers/iio/pressure/bmp280.c

+10 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/delay.h>

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

#include <linux/gpio/consumer.h>



/* BMP280 specific registers */

#define BMP280_REG_HUMIDITY_LSB		0xFE
@@ -1024,6 +1025,7 @@ static int bmp280_probe(struct i2c_client *client, 
	struct iio_dev *indio_dev;

	struct bmp280_data *data;

	unsigned int chip_id;

	struct gpio_desc *gpiod;



	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));

	if (!indio_dev)
@@ -1063,6 +1065,14 @@ static int bmp280_probe(struct i2c_client *client, 
		return -EINVAL;

	}



	/* Bring chip out of reset if there is an assigned GPIO line */

	gpiod = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);

	/* Deassert the signal */

	if (!IS_ERR(gpiod)) {

		dev_info(&client->dev, "release reset\n");

		gpiod_set_value(gpiod, 0);

	}



	data->regmap = devm_regmap_init_i2c(client,

					data->chip_info->regmap_config);

	if (IS_ERR(data->regmap)) {