| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
|---|
| 2 | /* The industrial I/O core - generic buffer interfaces. |
|---|
| 3 | * |
|---|
| 4 | * Copyright (c) 2008 Jonathan Cameron |
|---|
| 5 | */ |
|---|
| 6 | |
|---|
| 7 | #ifndef _IIO_BUFFER_GENERIC_H_ |
|---|
| 8 | #define _IIO_BUFFER_GENERIC_H_ |
|---|
| 9 | #include <linux/sysfs.h> |
|---|
| 10 | #include <linux/iio/iio.h> |
|---|
| 11 | |
|---|
| 12 | struct iio_buffer; |
|---|
| 13 | |
|---|
| 14 | enum iio_buffer_direction { |
|---|
| 15 | IIO_BUFFER_DIRECTION_IN, |
|---|
| 16 | IIO_BUFFER_DIRECTION_OUT, |
|---|
| 17 | }; |
|---|
| 18 | |
|---|
| 19 | int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data); |
|---|
| 20 | |
|---|
| 21 | int iio_pop_from_buffer(struct iio_buffer *buffer, void *data); |
|---|
| 22 | |
|---|
| 23 | /** |
|---|
| 24 | * iio_push_to_buffers_with_timestamp() - push data and timestamp to buffers |
|---|
| 25 | * @indio_dev: iio_dev structure for device. |
|---|
| 26 | * @data: sample data |
|---|
| 27 | * @timestamp: timestamp for the sample data |
|---|
| 28 | * |
|---|
| 29 | * Pushes data to the IIO device's buffers. If timestamps are enabled for the |
|---|
| 30 | * device the function will store the supplied timestamp as the last element in |
|---|
| 31 | * the sample data buffer before pushing it to the device buffers. The sample |
|---|
| 32 | * data buffer needs to be large enough to hold the additional timestamp |
|---|
| 33 | * (usually the buffer should be indio->scan_bytes bytes large). |
|---|
| 34 | * |
|---|
| 35 | * Returns 0 on success, a negative error code otherwise. |
|---|
| 36 | */ |
|---|
| 37 | static inline int iio_push_to_buffers_with_timestamp(struct iio_dev *indio_dev, |
|---|
| 38 | void *data, int64_t timestamp) |
|---|
| 39 | { |
|---|
| 40 | if (ACCESS_PRIVATE(indio_dev, scan_timestamp)) { |
|---|
| 41 | size_t ts_offset = indio_dev->scan_bytes / sizeof(int64_t) - 1; |
|---|
| 42 | ((int64_t *)data)[ts_offset] = timestamp; |
|---|
| 43 | } |
|---|
| 44 | |
|---|
| 45 | return iio_push_to_buffers(indio_dev, data); |
|---|
| 46 | } |
|---|
| 47 | |
|---|
| 48 | static inline int iio_push_to_buffers_with_ts(struct iio_dev *indio_dev, |
|---|
| 49 | void *data, size_t data_total_len, |
|---|
| 50 | s64 timestamp) |
|---|
| 51 | { |
|---|
| 52 | if (unlikely(data_total_len < indio_dev->scan_bytes)) { |
|---|
| 53 | dev_err(&indio_dev->dev, "Undersized storage pushed to buffer\n" ); |
|---|
| 54 | return -ENOSPC; |
|---|
| 55 | } |
|---|
| 56 | |
|---|
| 57 | return iio_push_to_buffers_with_timestamp(indio_dev, data, timestamp); |
|---|
| 58 | } |
|---|
| 59 | |
|---|
| 60 | int iio_push_to_buffers_with_ts_unaligned(struct iio_dev *indio_dev, |
|---|
| 61 | const void *data, size_t data_sz, |
|---|
| 62 | int64_t timestamp); |
|---|
| 63 | |
|---|
| 64 | bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev, |
|---|
| 65 | const unsigned long *mask); |
|---|
| 66 | |
|---|
| 67 | int iio_device_attach_buffer(struct iio_dev *indio_dev, |
|---|
| 68 | struct iio_buffer *buffer); |
|---|
| 69 | |
|---|
| 70 | #endif /* _IIO_BUFFER_GENERIC_H_ */ |
|---|
| 71 | |
|---|
