On Fri, 2025-01-17 at 15:06 +0200, Antoniu Miclaus wrote:
> Add backend support for obtaining the interface type used.
>
> Reviewed-by: David Lechner <dlechner@xxxxxxxxxxxx>
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx>
> ---
Reviewed-by: Nuno Sa <nuno.sa@xxxxxxxxxx>
> no changes in v10.
> drivers/iio/industrialio-backend.c | 24 ++++++++++++++++++++++++
> include/linux/iio/backend.h | 11 +++++++++++
> 2 files changed, 35 insertions(+)
>
> diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-
> backend.c
> index 363281272035..8bf3d570da1b 100644
> --- 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 10be00f3b120..a0ea6c29d7ba 100644
> --- 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);
