[PATCH 2/8] iio: add enable and disable services to iio backend framework

[Olivier Moysan <olivier.moysan@foss.st.com>]

Add iio_backend_disable() and iio_backend_enable() APIs to allow
IIO backend consumer to request backend disabling and enabling.

Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
---
 drivers/iio/industrialio-backend.c | 26 ++++++++++++++++++++++++++
 include/linux/iio/backend.h        |  2 ++
 2 files changed, 28 insertions(+)

diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index b950e30018ca..d3db048c086b 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -166,6 +166,32 @@ int devm_iio_backend_enable(struct device *dev, struct iio_backend *back)
 }
 EXPORT_SYMBOL_NS_GPL(devm_iio_backend_enable, IIO_BACKEND);
 
+/**
+ * iio_backend_enable - Backend enable
+ * @dev: Consumer device for the backend
+ * @back: Backend device
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_enable(struct device *dev, struct iio_backend *back)
+{
+	return iio_backend_op_call(back, enable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_enable, IIO_BACKEND);
+
+/**
+ * iio_backend_disable - Backend disable
+ * @dev: Consumer device for the backend
+ * @back: Backend device
+ *
+ */
+void iio_backend_disable(struct device *dev, struct iio_backend *back)
+{
+	iio_backend_void_op_call(back, disable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_disable, IIO_BACKEND);
+
 /**
  * iio_backend_data_format_set - Configure the channel data format
  * @back: Backend device
diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h
index cff486699054..81277e5b6160 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -120,6 +120,8 @@ struct iio_backend_ops {
 int iio_backend_chan_enable(struct iio_backend *back, unsigned int chan);
 int iio_backend_chan_disable(struct iio_backend *back, unsigned int chan);
 int devm_iio_backend_enable(struct device *dev, struct iio_backend *back);
+int iio_backend_enable(struct device *dev, struct iio_backend *back);
+void iio_backend_disable(struct device *dev, struct iio_backend *back);
 int iio_backend_data_format_set(struct iio_backend *back, unsigned int chan,
 				const struct iio_backend_data_fmt *data);
 int iio_backend_data_source_set(struct iio_backend *back, unsigned int chan,
-- 
2.25.1