/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright 2011 Broadcom Corporation. All rights reserved. */
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#ifndef __SOUND_ARM_BCM2835_H
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#define __SOUND_ARM_BCM2835_H
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#include <linux/device.h>
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#include <linux/wait.h>
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#include <linux/raspberrypi/vchiq.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm-indirect.h>
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#define MAX_SUBSTREAMS (8)
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#define AVAIL_SUBSTREAMS_MASK (0xff)
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enum {
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CTRL_VOL_MUTE,
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CTRL_VOL_UNMUTE
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};
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/* macros for alsa2chip and chip2alsa, instead of functions */
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// convert alsa to chip volume (defined as macro rather than function call)
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#define alsa2chip(vol) (uint)(-(((vol) << 8) / 100))
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// convert chip to alsa volume
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#define chip2alsa(vol) -(((vol) * 100) >> 8)
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#define CHIP_MIN_VOLUME 26214 /* minimum level aka mute */
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/* Some constants for values .. */
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enum snd_bcm2835_route {
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AUDIO_DEST_AUTO = 0,
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AUDIO_DEST_HEADPHONES = 1,
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AUDIO_DEST_HDMI = 2,
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AUDIO_DEST_MAX,
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};
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enum snd_bcm2835_ctrl {
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PCM_PLAYBACK_VOLUME,
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PCM_PLAYBACK_MUTE,
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PCM_PLAYBACK_DEVICE,
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};
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struct bcm2835_vchi_ctx {
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struct vchiq_instance *instance;
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};
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/* definition of the chip-specific record */
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struct bcm2835_chip {
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struct snd_card *card;
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struct snd_pcm *pcm;
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struct snd_pcm *pcm_spdif;
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struct device *dev;
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struct bcm2835_alsa_stream *alsa_stream[MAX_SUBSTREAMS];
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int volume;
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int dest;
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int mute;
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unsigned int opened;
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unsigned int spdif_status;
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struct mutex audio_mutex;
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struct bcm2835_vchi_ctx *vchi_ctx;
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};
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struct bcm2835_alsa_stream {
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struct bcm2835_chip *chip;
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struct snd_pcm_substream *substream;
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struct snd_pcm_indirect pcm_indirect;
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int draining;
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atomic_t pos;
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unsigned int period_offset;
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unsigned int buffer_size;
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unsigned int period_size;
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ktime_t interpolate_start;
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struct bcm2835_audio_instance *instance;
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int idx;
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};
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int snd_bcm2835_new_ctl(struct bcm2835_chip *chip);
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int snd_bcm2835_new_pcm(struct bcm2835_chip *chip, const char *name,
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int idx, enum snd_bcm2835_route route,
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u32 numchannels, bool spdif);
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int snd_bcm2835_new_hdmi_ctl(struct bcm2835_chip *chip);
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int snd_bcm2835_new_headphones_ctl(struct bcm2835_chip *chip);
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int bcm2835_new_vchi_ctx(struct device *dev, struct bcm2835_vchi_ctx *vchi_ctx);
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void bcm2835_free_vchi_ctx(struct bcm2835_vchi_ctx *vchi_ctx);
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int bcm2835_audio_open(struct bcm2835_alsa_stream *alsa_stream);
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int bcm2835_audio_close(struct bcm2835_alsa_stream *alsa_stream);
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int bcm2835_audio_set_params(struct bcm2835_alsa_stream *alsa_stream,
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unsigned int channels, unsigned int samplerate,
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unsigned int bps);
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int bcm2835_audio_start(struct bcm2835_alsa_stream *alsa_stream);
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int bcm2835_audio_stop(struct bcm2835_alsa_stream *alsa_stream);
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int bcm2835_audio_drain(struct bcm2835_alsa_stream *alsa_stream);
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int bcm2835_audio_set_ctls(struct bcm2835_alsa_stream *alsa_stream);
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int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream,
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unsigned int count,
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void *src);
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void bcm2835_playback_fifo(struct bcm2835_alsa_stream *alsa_stream,
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unsigned int size);
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unsigned int bcm2835_audio_retrieve_buffers(struct bcm2835_alsa_stream *alsa_stream);
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#endif /* __SOUND_ARM_BCM2835_H */
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