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authorCharles Keepax <ckeepax@opensource.cirrus.com>2022-11-23 19:54:24 +0300
committerMark Brown <broonie@kernel.org>2022-11-28 16:04:24 +0300
commite45875168d19051ebf0fc4b091da6256f3ea3669 (patch)
tree163263baed456ecc48d067e1511570c96f011b36 /include/sound/sdw.h
parentd695d089e35e28f3f0ed4595a242922cc28f9b20 (diff)
downloadlinux-e45875168d19051ebf0fc4b091da6256f3ea3669.tar.xz
sound: sdw: Add hw_params to SoundWire config helper function
The vast majority of the current users of the SoundWire framework have almost identical code for converting from hw_params to SoundWire configuration. Whilst complex devices might require more, it is very likely that most new devices will follow the same pattern. Save a little code by factoring this out into a helper function. Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com> Link: https://lore.kernel.org/r/20221123165432.594972-1-ckeepax@opensource.cirrus.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/sound/sdw.h')
-rw-r--r--include/sound/sdw.h49
1 files changed, 49 insertions, 0 deletions
diff --git a/include/sound/sdw.h b/include/sound/sdw.h
new file mode 100644
index 000000000000..6dcdb3228dba
--- /dev/null
+++ b/include/sound/sdw.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * linux/sound/sdw.h -- SoundWire helpers for ALSA/ASoC
+ *
+ * Copyright (c) 2022 Cirrus Logic Inc.
+ *
+ * Author: Charles Keepax <ckeepax@opensource.cirrus.com>
+ */
+
+#include <linux/soundwire/sdw.h>
+#include <sound/asound.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#ifndef __INCLUDE_SOUND_SDW_H
+#define __INCLUDE_SOUND_SDW_H
+
+/**
+ * snd_sdw_params_to_config() - Conversion from hw_params to SoundWire config
+ *
+ * @substream: Pointer to the PCM substream structure
+ * @params: Pointer to the hardware params structure
+ * @stream_config: Stream configuration for the SoundWire audio stream
+ * @port_config: Port configuration for the SoundWire audio stream
+ *
+ * This function provides a basic conversion from the hw_params structure to
+ * SoundWire configuration structures. The user will at a minimum need to also
+ * set the port number in the port config, but may also override more of the
+ * setup, or in the case of a complex user, not use this helper at all and
+ * open-code everything.
+ */
+static inline void snd_sdw_params_to_config(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct sdw_stream_config *stream_config,
+ struct sdw_port_config *port_config)
+{
+ stream_config->frame_rate = params_rate(params);
+ stream_config->ch_count = params_channels(params);
+ stream_config->bps = snd_pcm_format_width(params_format(params));
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ stream_config->direction = SDW_DATA_DIR_RX;
+ else
+ stream_config->direction = SDW_DATA_DIR_TX;
+
+ port_config->ch_mask = GENMASK(stream_config->ch_count - 1, 0);
+}
+
+#endif