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iio: backend: extend features

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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: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>
Reviewed-by: David 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: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Angelo Dureghello
2024-10-28 22:45:30 +01:00
committed by Jonathan Cameron
parent 043e4e514c
commit d3eeb1ac0b
2 changed files with 95 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/iio/industrialio-backend.c
+78
View File
@@ -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
View File
@@ -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);