Commit d3eeb1ac authored by Angelo Dureghello's avatar Angelo Dureghello Committed by Jonathan Cameron
Browse files

iio: backend: extend features 



Extend backend features with new calls needed later on this
patchset from axi version of ad3552r.

The follwoing calls are added:

iio_backend_ddr_enable()
	enable ddr bus transfer
iio_backend_ddr_disable()
	disable ddr bus transfer
iio_backend_data_stream_enable()
	enable data stream over bus interface
iio_backend_data_stream_disable()
	disable data stream over bus interface
iio_backend_data_transfer_addr()
	define the target register address where the DAC sample
	will be written.

Reviewed-by: default avatarNuno Sa <nuno.sa@analog.com>
Signed-off-by: default avatarAngelo Dureghello <adureghello@baylibre.com>
Reviewed-by: default avatarDavid Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20241028-wip-bl-ad3552r-axi-v0-iio-testing-v9-3-f6960b4f9719@kernel-space.org


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 043e4e51

drivers/iio/industrialio-backend.c

+78 −0
Original line number Diff line number Diff line
@@ -718,6 +718,84 @@ static int __devm_iio_backend_get(struct device *dev, struct iio_backend *back) 
	return 0;

}



/**

 * iio_backend_ddr_enable - Enable interface DDR (Double Data Rate) mode

 * @back: Backend device

 *

 * Enable DDR, data is generated by the IP at each front (raising and falling)

 * of the bus clock signal.

 *

 * RETURNS:

 * 0 on success, negative error number on failure.

 */

int iio_backend_ddr_enable(struct iio_backend *back)

{

	return iio_backend_op_call(back, ddr_enable);

}

EXPORT_SYMBOL_NS_GPL(iio_backend_ddr_enable, IIO_BACKEND);



/**

 * iio_backend_ddr_disable - Disable interface DDR (Double Data Rate) mode

 * @back: Backend device

 *

 * Disable DDR, setting into SDR mode (Single Data Rate).

 *

 * RETURNS:

 * 0 on success, negative error number on failure.

 */

int iio_backend_ddr_disable(struct iio_backend *back)

{

	return iio_backend_op_call(back, ddr_disable);

}

EXPORT_SYMBOL_NS_GPL(iio_backend_ddr_disable, IIO_BACKEND);



/**

 * iio_backend_data_stream_enable - Enable data stream

 * @back: Backend device

 *

 * Enable data stream over the bus interface.

 *

 * RETURNS:

 * 0 on success, negative error number on failure.

 */

int iio_backend_data_stream_enable(struct iio_backend *back)

{

	return iio_backend_op_call(back, data_stream_enable);

}

EXPORT_SYMBOL_NS_GPL(iio_backend_data_stream_enable, IIO_BACKEND);



/**

 * iio_backend_data_stream_disable - Disable data stream

 * @back: Backend device

 *

 * Disable data stream over the bus interface.

 *

 * RETURNS:

 * 0 on success, negative error number on failure.

 */

int iio_backend_data_stream_disable(struct iio_backend *back)

{

	return iio_backend_op_call(back, data_stream_disable);

}

EXPORT_SYMBOL_NS_GPL(iio_backend_data_stream_disable, IIO_BACKEND);



/**

 * iio_backend_data_transfer_addr - Set data address.

 * @back: Backend device

 * @address: Data register address

 *

 * Some devices may need to inform the backend about an address

 * where to read or write the data.

 *

 * RETURNS:

 * 0 on success, negative error number on failure.

 */

int iio_backend_data_transfer_addr(struct iio_backend *back, u32 address)

{

	return iio_backend_op_call(back, data_transfer_addr, address);

}

EXPORT_SYMBOL_NS_GPL(iio_backend_data_transfer_addr, IIO_BACKEND);



static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *dev, const char *name,

							 struct fwnode_handle *fwnode)

{

include/linux/iio/backend.h

+17 −0
Original line number Diff line number Diff line
@@ -14,12 +14,14 @@ struct iio_dev; 
enum iio_backend_data_type {

	IIO_BACKEND_TWOS_COMPLEMENT,

	IIO_BACKEND_OFFSET_BINARY,

	IIO_BACKEND_DATA_UNSIGNED,

	IIO_BACKEND_DATA_TYPE_MAX

};



enum iio_backend_data_source {

	IIO_BACKEND_INTERNAL_CONTINUOUS_WAVE,

	IIO_BACKEND_EXTERNAL,

	IIO_BACKEND_INTERNAL_RAMP_16BIT,

	IIO_BACKEND_DATA_SOURCE_MAX

};
@@ -89,6 +91,11 @@ enum iio_backend_sample_trigger { 
 * @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.

 * @ddr_enable: Enable interface DDR (Double Data Rate) mode.

 * @ddr_disable: Disable interface DDR (Double Data Rate) mode.

 * @data_stream_enable: Enable data stream.

 * @data_stream_disable: Disable data stream.

 * @data_transfer_addr: Set data address.

 **/

struct iio_backend_ops {

	int (*enable)(struct iio_backend *back);
@@ -129,6 +136,11 @@ struct iio_backend_ops { 
					 size_t len);

	int (*debugfs_reg_access)(struct iio_backend *back, unsigned int reg,

				  unsigned int writeval, unsigned int *readval);

	int (*ddr_enable)(struct iio_backend *back);

	int (*ddr_disable)(struct iio_backend *back);

	int (*data_stream_enable)(struct iio_backend *back);

	int (*data_stream_disable)(struct iio_backend *back);

	int (*data_transfer_addr)(struct iio_backend *back, u32 address);

};



/**
@@ -164,6 +176,11 @@ int iio_backend_data_sample_trigger(struct iio_backend *back, 
int devm_iio_backend_request_buffer(struct device *dev,

				    struct iio_backend *back,

				    struct iio_dev *indio_dev);

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);

int iio_backend_data_stream_disable(struct iio_backend *back);

int iio_backend_data_transfer_addr(struct iio_backend *back, u32 address);

ssize_t iio_backend_ext_info_set(struct iio_dev *indio_dev, uintptr_t private,

				 const struct iio_chan_spec *chan,

				 const char *buf, size_t len);