include/sound/sdw.h

   1 /* SPDX-License-Identifier: GPL-2.0
   2  *
   3  * linux/sound/sdw.h -- SoundWire helpers for ALSA/ASoC
   4  *
   5  * Copyright (c) 2022 Cirrus Logic Inc.
   6  *
   7  * Author: Charles Keepax <ckeepax@opensource.cirrus.com>
   8  */
   9
  10 #include <linux/soundwire/sdw.h>
  11 #include <sound/asound.h>
  12 #include <sound/pcm.h>
  13 #include <sound/pcm_params.h>
  14
  15 #ifndef __INCLUDE_SOUND_SDW_H
  16 #define __INCLUDE_SOUND_SDW_H
  17
  18 /**
  19  * snd_sdw_params_to_config() - Conversion from hw_params to SoundWire config
  20  *
  21  * @substream: Pointer to the PCM substream structure
  22  * @params: Pointer to the hardware params structure
  23  * @stream_config: Stream configuration for the SoundWire audio stream
  24  * @port_config: Port configuration for the SoundWire audio stream
  25  *
  26  * This function provides a basic conversion from the hw_params structure to
  27  * SoundWire configuration structures. The user will at a minimum need to also
  28  * set the port number in the port config, but may also override more of the
  29  * setup, or in the case of a complex user, not use this helper at all and
  30  * open-code everything.
  31  */
  32 static inline void snd_sdw_params_to_config(struct snd_pcm_substream *substream,
  33                                             struct snd_pcm_hw_params *params,
  34                                             struct sdw_stream_config *stream_config,
  35                                             struct sdw_port_config *port_config)
  36 {
  37         stream_config->frame_rate = params_rate(params);
  38         stream_config->ch_count = params_channels(params);
  39         stream_config->bps = snd_pcm_format_width(params_format(params));
  40
  41         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  42                 stream_config->direction = SDW_DATA_DIR_RX;
  43         else
  44                 stream_config->direction = SDW_DATA_DIR_TX;
  45
  46         port_config->ch_mask = GENMASK(stream_config->ch_count - 1, 0);
  47 }
  48
  49 #endif