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