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Whilst it is almost always possible to arrange for scan data to be read directly into a buffer that is suitable for passing to iio_push_to_buffers_with_timestamp(), there are a few places where leading data needs to be skipped over. For these cases introduce a function that will allocate an appropriate sized and aligned bounce buffer (if not already allocated) and copy the unaligned data into that before calling iio_push_to_buffers_with_timestamp() on the bounce buffer. We tie the lifespace of this buffer to that of the iio_dev.dev which should ensure no memory leaks occur. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Nuno Sá <nuno.sa@analog.com> Link: https://lore.kernel.org/r/20210613151039.569883-2-jic23@kernel.org
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* The industrial I/O core - generic buffer interfaces.
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*
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* Copyright (c) 2008 Jonathan Cameron
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*/
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#ifndef _IIO_BUFFER_GENERIC_H_
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#define _IIO_BUFFER_GENERIC_H_
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#include <linux/sysfs.h>
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#include <linux/iio/iio.h>
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struct iio_buffer;
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int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data);
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/**
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* iio_push_to_buffers_with_timestamp() - push data and timestamp to buffers
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* @indio_dev: iio_dev structure for device.
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* @data: sample data
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* @timestamp: timestamp for the sample data
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*
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* Pushes data to the IIO device's buffers. If timestamps are enabled for the
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* device the function will store the supplied timestamp as the last element in
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* the sample data buffer before pushing it to the device buffers. The sample
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* data buffer needs to be large enough to hold the additional timestamp
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* (usually the buffer should be indio->scan_bytes bytes large).
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*
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* Returns 0 on success, a negative error code otherwise.
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*/
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static inline int iio_push_to_buffers_with_timestamp(struct iio_dev *indio_dev,
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void *data, int64_t timestamp)
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{
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if (indio_dev->scan_timestamp) {
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size_t ts_offset = indio_dev->scan_bytes / sizeof(int64_t) - 1;
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((int64_t *)data)[ts_offset] = timestamp;
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}
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return iio_push_to_buffers(indio_dev, data);
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}
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int iio_push_to_buffers_with_ts_unaligned(struct iio_dev *indio_dev,
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const void *data, size_t data_sz,
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int64_t timestamp);
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bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev,
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const unsigned long *mask);
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int iio_device_attach_buffer(struct iio_dev *indio_dev,
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struct iio_buffer *buffer);
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#endif /* _IIO_BUFFER_GENERIC_H_ */
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