diff options
| author | Linus Walleij | 2016-06-30 03:48:47 +0200 |
|---|---|---|
| committer | Jonathan Cameron | 2016-06-30 20:39:40 +0100 |
| commit | c5842b47b2945d6db24b4db6b2c7364e94cbc78b (patch) | |
| tree | 2a4c4d65634f11163445bb55b9433093cf762fa7 /drivers/iio | |
| parent | 78f5027132243b7071dc59ea6f717e2c48e12031 (diff) | |
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: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/pressure/bmp280.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/iio/pressure/bmp280.c b/drivers/iio/pressure/bmp280.c index a147ce2de0e1..77172f047f61 100644 --- a/drivers/iio/pressure/bmp280.c +++ b/drivers/iio/pressure/bmp280.c @@ -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)) { |