1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h
new file mode 100644
index 000000000..38b7451d7
--- /dev/null
+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h
@@ -0,0 +1,113 @@
+/* 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; /* Serialize chip data access */
+
+	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 */