include/linux/iio/buffer.h

   1 /* The industrial I/O core - generic buffer interfaces.
   2  *
   3  * Copyright (c) 2008 Jonathan Cameron
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  */
   9
  10 #ifndef _IIO_BUFFER_GENERIC_H_
  11 #define _IIO_BUFFER_GENERIC_H_
  12 #include <linux/sysfs.h>
  13 #include <linux/iio/iio.h>
  14
  15 struct iio_buffer;
  16
  17 void iio_buffer_set_attrs(struct iio_buffer *buffer,
  18                          const struct attribute **attrs);
  19
  20 int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data);
  21
  22 /**
  23  * iio_push_to_buffers_with_timestamp() - push data and timestamp to buffers
  24  * @indio_dev:          iio_dev structure for device.
  25  * @data:               sample data
  26  * @timestamp:          timestamp for the sample data
  27  *
  28  * Pushes data to the IIO device's buffers. If timestamps are enabled for the
  29  * device the function will store the supplied timestamp as the last element in
  30  * the sample data buffer before pushing it to the device buffers. The sample
  31  * data buffer needs to be large enough to hold the additional timestamp
  32  * (usually the buffer should be indio->scan_bytes bytes large).
  33  *
  34  * Returns 0 on success, a negative error code otherwise.
  35  */
  36 static inline int iio_push_to_buffers_with_timestamp(struct iio_dev *indio_dev,
  37         void *data, int64_t timestamp)
  38 {
  39         if (indio_dev->scan_timestamp) {
  40                 size_t ts_offset = indio_dev->scan_bytes / sizeof(int64_t) - 1;
  41                 ((int64_t *)data)[ts_offset] = timestamp;
  42         }
  43
  44         return iio_push_to_buffers(indio_dev, data);
  45 }
  46
  47 bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev,
  48                                    const unsigned long *mask);
  49
  50 void iio_device_attach_buffer(struct iio_dev *indio_dev,
  51                               struct iio_buffer *buffer);
  52
  53 #endif /* _IIO_BUFFER_GENERIC_H_ */