iio: backend: add API for interface get

Add backend support for obtaining the interface type used.

Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://patch.msgid.link/20250214131955.31973-2-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index 363281272035209f7cf462bbfc3b406449321490..8bf3d570da1b724b54e27590b972647e67242692 100644 (file)
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -636,6 +636,30 @@ ssize_t iio_backend_ext_info_set(struct iio_dev *indio_dev, uintptr_t private,
 }
 EXPORT_SYMBOL_NS_GPL(iio_backend_ext_info_set, "IIO_BACKEND");
 
+/**
+ * iio_backend_interface_type_get - get the interface type used.
+ * @back: Backend device
+ * @type: Interface type
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_interface_type_get(struct iio_backend *back,
+                                  enum iio_backend_interface_type *type)
+{
+       int ret;
+
+       ret = iio_backend_op_call(back, interface_type_get, type);
+       if (ret)
+               return ret;
+
+       if (*type >= IIO_BACKEND_INTERFACE_MAX)
+               return -EINVAL;
+
+       return 0;
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_interface_type_get, "IIO_BACKEND");
+
 /**
  * iio_backend_extend_chan_spec - Extend an IIO channel
  * @back: Backend device

diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h
index 10be00f3b1206e8a58ddf4f0267c8bcb05269f33..a0ea6c29d7bab230f472392d3e74cfacf73e2e03 100644 (file)
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -70,6 +70,12 @@ enum iio_backend_sample_trigger {
        IIO_BACKEND_SAMPLE_TRIGGER_MAX
 };
 
+enum iio_backend_interface_type {
+       IIO_BACKEND_INTERFACE_SERIAL_LVDS,
+       IIO_BACKEND_INTERFACE_SERIAL_CMOS,
+       IIO_BACKEND_INTERFACE_MAX
+};
+
 /**
  * struct iio_backend_ops - operations structure for an iio_backend
  * @enable: Enable backend.
@@ -88,6 +94,7 @@ enum iio_backend_sample_trigger {
  * @extend_chan_spec: Extend an IIO channel.
  * @ext_info_set: Extended info setter.
  * @ext_info_get: Extended info getter.
+ * @interface_type_get: Interface type.
  * @read_raw: Read a channel attribute from a backend device
  * @debugfs_print_chan_status: Print channel status into a buffer.
  * @debugfs_reg_access: Read or write register value of backend.
@@ -128,6 +135,8 @@ struct iio_backend_ops {
                            const char *buf, size_t len);
        int (*ext_info_get)(struct iio_backend *back, uintptr_t private,
                            const struct iio_chan_spec *chan, char *buf);
+       int (*interface_type_get)(struct iio_backend *back,
+                                 enum iio_backend_interface_type *type);
        int (*read_raw)(struct iio_backend *back,
                        struct iio_chan_spec const *chan, int *val, int *val2,
                        long mask);
@@ -186,6 +195,8 @@ ssize_t iio_backend_ext_info_set(struct iio_dev *indio_dev, uintptr_t private,
                                 const char *buf, size_t len);
 ssize_t iio_backend_ext_info_get(struct iio_dev *indio_dev, uintptr_t private,
                                 const struct iio_chan_spec *chan, char *buf);
+int iio_backend_interface_type_get(struct iio_backend *back,
+                                  enum iio_backend_interface_type *type);
 int iio_backend_read_raw(struct iio_backend *back,
                         struct iio_chan_spec const *chan, int *val, int *val2,
                         long mask);