alsa-lib/src/topology/tplg_local.h

/*
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 */

#include <limits.h>
#include <stdint.h>
#include <linux/types.h>

#include "local.h"
#include "list.h"
#include "topology.h"

#include <sound/asound.h>
#include <sound/asoc.h>
#include <sound/tlv.h>

#define TPLG_DEBUG
#ifdef TPLG_DEBUG
#define tplg_dbg SNDERR
#else
#define tplg_dbg(fmt, arg...) do { } while (0)
#endif

#define MAX_FILE		256
#define TPLG_MAX_PRIV_SIZE	(1024 * 128)
#define ALSA_TPLG_DIR	ALSA_CONFIG_DIR "/topology"
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))

/** The name of the environment variable containing the tplg directory */
#define ALSA_CONFIG_TPLG_VAR "ALSA_CONFIG_TPLG"

struct tplg_ref;
struct tplg_elem;

/* internal topology object type not used by kernel */
enum object_type {
	OBJECT_TYPE_TLV = 0,
	OBJECT_TYPE_MIXER,
	OBJECT_TYPE_ENUM,
	OBJECT_TYPE_TEXT,
	OBJECT_TYPE_DATA,
	OBJECT_TYPE_BYTES,
	OBJECT_TYPE_STREAM_CONFIG,
	OBJECT_TYPE_STREAM_CAPS,
	OBJECT_TYPE_PCM,
	OBJECT_TYPE_DAPM_WIDGET,
	OBJECT_TYPE_DAPM_GRAPH,
	OBJECT_TYPE_BE,
	OBJECT_TYPE_CC,
	OBJECT_TYPE_MANIFEST,
};

struct snd_tplg {

	/* opaque vendor data */
	int vendor_fd;
	char *vendor_name;

	/* out file */
	int out_fd;

	int verbose;
	unsigned int version;

	/* runtime state */
	unsigned int next_hdr_pos;
	int index;
	int channel_idx;

	/* manifest */
	struct snd_soc_tplg_manifest manifest;

	/* list of each element type */
	struct list_head tlv_list;
	struct list_head widget_list;
	struct list_head pcm_list;
	struct list_head be_list;
	struct list_head cc_list;
	struct list_head route_list;
	struct list_head text_list;
	struct list_head pdata_list;
	struct list_head pcm_config_list;
	struct list_head pcm_caps_list;

	/* type-specific control lists */
	struct list_head mixer_list;
	struct list_head enum_list;
	struct list_head bytes_ext_list;
};

/* object text references */
struct tplg_ref {
	unsigned int type;
	struct tplg_elem *elem;
	char id[SNDRV_CTL_ELEM_ID_NAME_MAXLEN];
	struct list_head list;
};

/* topology element */
struct tplg_elem {

	char id[SNDRV_CTL_ELEM_ID_NAME_MAXLEN];

	/* storage for texts and data if this is text or data elem*/
	char texts[SND_SOC_TPLG_NUM_TEXTS][SNDRV_CTL_ELEM_ID_NAME_MAXLEN];

	int index;
	enum object_type type;

	int size; /* total size of this object inc pdata and ref objects */
	int compound_elem; /* dont write this element as individual elem */
	int vendor_type; /* vendor type for private data */

	/* UAPI object for this elem */
	union {
		void *obj;
		struct snd_soc_tplg_mixer_control *mixer_ctrl;
		struct snd_soc_tplg_enum_control *enum_ctrl;
		struct snd_soc_tplg_bytes_control *bytes_ext;
		struct snd_soc_tplg_dapm_widget *widget;
		struct snd_soc_tplg_pcm_dai *pcm;
		struct snd_soc_tplg_pcm_dai *be;
		struct snd_soc_tplg_pcm_dai *cc;
		struct snd_soc_tplg_dapm_graph_elem *route;
		struct snd_soc_tplg_stream_config *stream_cfg;
		struct snd_soc_tplg_stream_caps *stream_caps;

		/* these do not map to UAPI structs but are internal only */
		struct snd_soc_tplg_ctl_tlv *tlv;
		struct snd_soc_tplg_private *data;
	};

	/* an element may refer to other elements:
	 * a mixer control may refer to a tlv,
	 * a widget may refer to a mixer control array,
	 * a graph may refer to some widgets.
	 */
	struct list_head ref_list;
	struct list_head list; /* list of all elements with same type */
};

struct map_elem {
	const char *name;
	int id;
};

int tplg_parse_compound(snd_tplg_t *tplg, snd_config_t *cfg,
	int (*fcn)(snd_tplg_t *, snd_config_t *, void *),
	void *private);

int tplg_write_data(snd_tplg_t *tplg);

int tplg_parse_tlv(snd_tplg_t *tplg, snd_config_t *cfg,
	void *private ATTRIBUTE_UNUSED);

int tplg_parse_text(snd_tplg_t *tplg, snd_config_t *cfg,
	void *private ATTRIBUTE_UNUSED);

int tplg_parse_data(snd_tplg_t *tplg, snd_config_t *cfg,
	void *private ATTRIBUTE_UNUSED);

int tplg_parse_control_bytes(snd_tplg_t *tplg,
	snd_config_t *cfg, void *private ATTRIBUTE_UNUSED);

int tplg_parse_control_enum(snd_tplg_t *tplg, snd_config_t *cfg,
	void *private ATTRIBUTE_UNUSED);

int tplg_parse_control_mixer(snd_tplg_t *tplg,
	snd_config_t *cfg, void *private ATTRIBUTE_UNUSED);

int tplg_parse_dapm_graph(snd_tplg_t *tplg, snd_config_t *cfg,
	void *private ATTRIBUTE_UNUSED);

int tplg_parse_dapm_widget(snd_tplg_t *tplg,
	snd_config_t *cfg, void *private ATTRIBUTE_UNUSED);

int tplg_parse_pcm_config(snd_tplg_t *tplg,
	snd_config_t *cfg, void *private ATTRIBUTE_UNUSED);

int tplg_parse_pcm_caps(snd_tplg_t *tplg,
	snd_config_t *cfg, void *private ATTRIBUTE_UNUSED);

int tplg_parse_pcm_cap_cfg(snd_tplg_t *tplg, snd_config_t *cfg,
	void *private);

int tplg_parse_pcm(snd_tplg_t *tplg,
	snd_config_t *cfg, void *private ATTRIBUTE_UNUSED);

int tplg_parse_be(snd_tplg_t *tplg,
	snd_config_t *cfg, void *private ATTRIBUTE_UNUSED);

int tplg_parse_cc(snd_tplg_t *tplg,
	snd_config_t *cfg, void *private ATTRIBUTE_UNUSED);

int tplg_build_controls(snd_tplg_t *tplg);
int tplg_build_widgets(snd_tplg_t *tplg);
int tplg_build_routes(snd_tplg_t *tplg);
int tplg_build_pcm_dai(snd_tplg_t *tplg, unsigned int type);

int tplg_copy_data(struct tplg_elem *elem, struct tplg_elem *ref);

int tplg_ref_add(struct tplg_elem *elem, int type, const char* id);

struct tplg_elem *tplg_elem_new(void);
void tplg_elem_free(struct tplg_elem *elem);
void tplg_elem_free_list(struct list_head *base);
struct tplg_elem *tplg_elem_lookup(struct list_head *base,
				const char* id,
				unsigned int type);
struct tplg_elem* tplg_elem_new_common(snd_tplg_t *tplg,
	snd_config_t *cfg, enum object_type type);

static inline void elem_copy_text(char *dest, const char *src, int len)
{
	strncpy(dest, src, len);
	dest[len - 1] = 0;
}

int tplg_parse_channel(snd_tplg_t *tplg ATTRIBUTE_UNUSED,
	snd_config_t *cfg, void *private);

int tplg_parse_ops(snd_tplg_t *tplg ATTRIBUTE_UNUSED,
	snd_config_t *cfg, void *private);

struct tplg_elem *lookup_pcm_dai_stream(struct list_head *base,
	const char* id);