[PATCH 04/14] iio: backend: add support for sync status

[Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx>]

Add iio backend support for synchronization status read.
The return value is a boolean stating if the synchronization is enabled
or disabled.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx>
---
 drivers/iio/industrialio-backend.c | 14 ++++++++++++++
 include/linux/iio/backend.h        |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index a81780f569e3..99c46b79e373 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -860,6 +860,20 @@ int iio_backend_self_sync_disable(struct iio_backend *back)
 }
 EXPORT_SYMBOL_NS_GPL(iio_backend_self_sync_disable, "IIO_BACKEND");
 
+/**
+ * iio_backend_sync_status_get - Read the syncronization status
+ * @back: Backend device
+ * @sync_en: Synchronization status returned (enabled or disabled)
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_sync_status_get(struct iio_backend *back, bool *sync_en)
+{
+	return iio_backend_op_call(back, sync_status_get, sync_en);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_sync_status_get, "IIO_BACKEND");
+
 /**
  * iio_backend_ddr_enable - Enable interface DDR (Double Data Rate) mode
  * @back: Backend device
diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h
index 8e663c838974..38322e808ee2 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -106,6 +106,7 @@ enum iio_backend_interface_type {
  * @bitslip_disable: Disable sync process.
  * @self_sync_enable: Enable the self sync data capture.
  * @self_sync_disable: Disable the self sync data capture.
+ * @sync_status_get: Get the syncronization status (enabled/disabled).
  * @ddr_enable: Enable interface DDR (Double Data Rate) mode.
  * @ddr_disable: Disable interface DDR (Double Data Rate) mode.
  * @data_stream_enable: Enable data stream.
@@ -162,6 +163,7 @@ struct iio_backend_ops {
 	int (*bitslip_disable)(struct iio_backend *back);
 	int (*self_sync_enable)(struct iio_backend *back);
 	int (*self_sync_disable)(struct iio_backend *back);
+	int (*sync_status_get)(struct iio_backend *back, bool *sync_en);
 	int (*ddr_enable)(struct iio_backend *back);
 	int (*ddr_disable)(struct iio_backend *back);
 	int (*data_stream_enable)(struct iio_backend *back);
@@ -208,6 +210,7 @@ int iio_backend_bitslip_enable(struct iio_backend *back);
 int iio_backend_bitslip_disable(struct iio_backend *back);
 int iio_backend_self_sync_enable(struct iio_backend *back);
 int iio_backend_self_sync_disable(struct iio_backend *back);
+int iio_backend_sync_status_get(struct iio_backend *back, bool *sync_en);
 int iio_backend_ddr_enable(struct iio_backend *back);
 int iio_backend_ddr_disable(struct iio_backend *back);
 int iio_backend_data_stream_enable(struct iio_backend *back);
-- 
2.48.1