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iio: pressure: bmp280: add reset GPIO line handling

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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: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Linus Walleij 2016-06-30 03:48:47 +02:00 committed by Jonathan Cameron
parent 78f5027132
commit c5842b47b2
1 changed files with 10 additions and 0 deletions
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10
drivers/iio/pressure/bmp280.c
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@ -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)) {