diff options
Diffstat (limited to 'drivers/iio/magnetometer')
| -rw-r--r-- | drivers/iio/magnetometer/ak8975.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c index fd368455cd7b..a23422aad97d 100644 --- a/drivers/iio/magnetometer/ak8975.c +++ b/drivers/iio/magnetometer/ak8975.c @@ -358,6 +358,7 @@ struct ak8975_data { u8 asa[3]; long raw_to_gauss[3]; struct gpio_desc *eoc_gpiod; + struct gpio_desc *reset_gpiod; int eoc_irq; wait_queue_head_t data_ready_queue; unsigned long flags; @@ -384,6 +385,9 @@ static int ak8975_power_on(const struct ak8975_data *data) "Failed to enable specified Vid supply\n"); return ret; } + + gpiod_set_value_cansleep(data->reset_gpiod, 0); + /* * According to the datasheet the power supply rise time is 200us * and the minimum wait time before mode setting is 100us, in @@ -396,6 +400,8 @@ static int ak8975_power_on(const struct ak8975_data *data) /* Disable attached power regulator if any. */ static void ak8975_power_off(const struct ak8975_data *data) { + gpiod_set_value_cansleep(data->reset_gpiod, 1); + regulator_disable(data->vid); regulator_disable(data->vdd); } @@ -839,6 +845,7 @@ static int ak8975_probe(struct i2c_client *client, struct ak8975_data *data; struct iio_dev *indio_dev; struct gpio_desc *eoc_gpiod; + struct gpio_desc *reset_gpiod; const void *match; unsigned int i; int err; @@ -856,6 +863,16 @@ static int ak8975_probe(struct i2c_client *client, if (eoc_gpiod) gpiod_set_consumer_name(eoc_gpiod, "ak_8975"); + /* + * According to AK09911 datasheet, if reset GPIO is provided then + * deassert reset on ak8975_power_on() and assert reset on + * ak8975_power_off(). + */ + reset_gpiod = devm_gpiod_get_optional(&client->dev, + "reset", GPIOD_OUT_HIGH); + if (IS_ERR(reset_gpiod)) + return PTR_ERR(reset_gpiod); + /* Register with IIO */ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (indio_dev == NULL) @@ -866,6 +883,7 @@ static int ak8975_probe(struct i2c_client *client, data->client = client; data->eoc_gpiod = eoc_gpiod; + data->reset_gpiod = reset_gpiod; data->eoc_irq = 0; err = iio_read_mount_matrix(&client->dev, "mount-matrix", &data->orientation); |