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iio: backend: add support for data source get

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Add backend support for getting the data source used.

The ad3552r HDL implements an internal ramp generator, so adding the
getter to allow data source get/set by debugfs.

Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>
Link: https://patch.msgid.link/20250409-wip-bl-ad3552r-fixes-v5-3-fb429c3a6515@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Angelo Dureghello 2025-04-09 20:36:30 +02:00 committed by Jonathan Cameron
parent ede84c4556
commit 2086321576
2 changed files with 33 additions and 0 deletions
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28
drivers/iio/industrialio-backend.c
View File

@ -380,6 +380,34 @@ int iio_backend_data_source_set(struct iio_backend *back, unsigned int chan,
}
EXPORT_SYMBOL_NS_GPL(iio_backend_data_source_set, "IIO_BACKEND");
/**
* iio_backend_data_source_get - Get current data source
* @back: Backend device
* @chan: Channel number
* @data: Pointer to receive the current source value
*
* A given backend may have different sources to stream/sync data. This allows
* to know what source is in use.
*
* RETURNS:
* 0 on success, negative error number on failure.
*/
int iio_backend_data_source_get(struct iio_backend *back, unsigned int chan,
enum iio_backend_data_source *data)
{
int ret;
ret = iio_backend_op_call(back, data_source_get, chan, data);
if (ret)
return ret;
if (*data >= IIO_BACKEND_DATA_SOURCE_MAX)
return -EINVAL;
return 0;
}
EXPORT_SYMBOL_NS_GPL(iio_backend_data_source_get, "IIO_BACKEND");
/**
* iio_backend_set_sampling_freq - Set channel sampling rate
* @back: Backend device

5
include/linux/iio/backend.h
View File

@ -84,6 +84,7 @@ enum iio_backend_interface_type {
* @chan_disable: Disable one channel.
* @data_format_set: Configure the data format for a specific channel.
* @data_source_set: Configure the data source for a specific channel.
* @data_source_get: Data source getter for a specific channel.
* @set_sample_rate: Configure the sampling rate for a specific channel.
* @test_pattern_set: Configure a test pattern.
* @chan_status: Get the channel status.
@ -115,6 +116,8 @@ struct iio_backend_ops {
const struct iio_backend_data_fmt *data);
int (*data_source_set)(struct iio_backend *back, unsigned int chan,
enum iio_backend_data_source data);
int (*data_source_get)(struct iio_backend *back, unsigned int chan,
enum iio_backend_data_source *data);
int (*set_sample_rate)(struct iio_backend *back, unsigned int chan,
u64 sample_rate_hz);
int (*test_pattern_set)(struct iio_backend *back,
@ -176,6 +179,8 @@ int iio_backend_data_format_set(struct iio_backend *back, unsigned int chan,
const struct iio_backend_data_fmt *data);
int iio_backend_data_source_set(struct iio_backend *back, unsigned int chan,
enum iio_backend_data_source data);
int iio_backend_data_source_get(struct iio_backend *back, unsigned int chan,
enum iio_backend_data_source *data);
int iio_backend_set_sampling_freq(struct iio_backend *back, unsigned int chan,
u64 sample_rate_hz);
int iio_backend_test_pattern_set(struct iio_backend *back,