diff options
| -rw-r--r-- | drivers/iio/industrialio-core.c | 38 | ||||
| -rw-r--r-- | include/linux/iio/iio.h | 2 |
2 files changed, 40 insertions, 0 deletions
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index f3f8392623a4..c9614982cb67 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -2085,6 +2085,44 @@ void iio_device_release_direct_mode(struct iio_dev *indio_dev) EXPORT_SYMBOL_GPL(iio_device_release_direct_mode); /** + * iio_device_claim_buffer_mode - Keep device in buffer mode + * @indio_dev: the iio_dev associated with the device + * + * If the device is in buffer mode it is guaranteed to stay + * that way until iio_device_release_buffer_mode() is called. + * + * Use with iio_device_release_buffer_mode(). + * + * Returns: 0 on success, -EBUSY on failure. + */ +int iio_device_claim_buffer_mode(struct iio_dev *indio_dev) +{ + mutex_lock(&indio_dev->mlock); + + if (iio_buffer_enabled(indio_dev)) + return 0; + + mutex_unlock(&indio_dev->mlock); + return -EBUSY; +} +EXPORT_SYMBOL_GPL(iio_device_claim_buffer_mode); + +/** + * iio_device_release_buffer_mode - releases claim on buffer mode + * @indio_dev: the iio_dev associated with the device + * + * Release the claim. Device is no longer guaranteed to stay + * in buffer mode. + * + * Use with iio_device_claim_buffer_mode(). + */ +void iio_device_release_buffer_mode(struct iio_dev *indio_dev) +{ + mutex_unlock(&indio_dev->mlock); +} +EXPORT_SYMBOL_GPL(iio_device_release_buffer_mode); + +/** * iio_device_get_current_mode() - helper function providing read-only access to * the opaque @currentmode variable * @indio_dev: IIO device structure for device diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h index f0ec8a5e5a7a..9d3bd6379eb8 100644 --- a/include/linux/iio/iio.h +++ b/include/linux/iio/iio.h @@ -629,6 +629,8 @@ int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev, int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp); int iio_device_claim_direct_mode(struct iio_dev *indio_dev); void iio_device_release_direct_mode(struct iio_dev *indio_dev); +int iio_device_claim_buffer_mode(struct iio_dev *indio_dev); +void iio_device_release_buffer_mode(struct iio_dev *indio_dev); extern struct bus_type iio_bus_type; |