Commit fc3fdb83 authored by Antoniu Miclaus's avatar Antoniu Miclaus Committed by Jonathan Cameron
Browse files

iio: backend: add support for data size set 



Add backend support for setting the data size used.
This setting can be adjusted within the IP cores interfacing devices.

Reviewed-by: default avatarNuno Sa <nuno.sa@analog.com>
Reviewed-by: default avatarDavid Lechner <dlechner@baylibre.com>
Signed-off-by: default avatarAntoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://patch.msgid.link/20250214131955.31973-3-antoniu.miclaus@analog.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 4018ab42

drivers/iio/industrialio-backend.c

+21 −0
Original line number Diff line number Diff line
@@ -660,6 +660,27 @@ int iio_backend_interface_type_get(struct iio_backend *back, 
}

EXPORT_SYMBOL_NS_GPL(iio_backend_interface_type_get, "IIO_BACKEND");



/**

 * iio_backend_data_size_set - set the data width/size in the data bus.

 * @back: Backend device

 * @size: Size in bits

 *

 * Some frontend devices can dynamically control the word/data size on the

 * interface/data bus. Hence, the backend device needs to be aware of it so

 * data can be correctly transferred.

 *

 * Return:

 * 0 on success, negative error number on failure.

 */

int iio_backend_data_size_set(struct iio_backend *back, unsigned int size)

{

	if (!size)

		return -EINVAL;



	return iio_backend_op_call(back, data_size_set, size);

}

EXPORT_SYMBOL_NS_GPL(iio_backend_data_size_set, "IIO_BACKEND");



/**

 * iio_backend_extend_chan_spec - Extend an IIO channel

 * @back: Backend device

include/linux/iio/backend.h

+3 −0
Original line number Diff line number Diff line
@@ -95,6 +95,7 @@ enum iio_backend_interface_type { 
 * @ext_info_set: Extended info setter.

 * @ext_info_get: Extended info getter.

 * @interface_type_get: Interface type.

 * @data_size_set: Data size.

 * @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.
@@ -137,6 +138,7 @@ struct iio_backend_ops { 
			    const struct iio_chan_spec *chan, char *buf);

	int (*interface_type_get)(struct iio_backend *back,

				  enum iio_backend_interface_type *type);

	int (*data_size_set)(struct iio_backend *back, unsigned int size);

	int (*read_raw)(struct iio_backend *back,

			struct iio_chan_spec const *chan, int *val, int *val2,

			long mask);
@@ -197,6 +199,7 @@ 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_data_size_set(struct iio_backend *back, unsigned int size);

int iio_backend_read_raw(struct iio_backend *back,

			 struct iio_chan_spec const *chan, int *val, int *val2,

			 long mask);