linux/include/sound/info.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __SOUND_INFO_H
#define __SOUND_INFO_H

/*
 *  Header file for info interface
 *  Copyright (c) by Jaroslav Kysela <[email protected]>
 */

#include <linux/poll.h>
#include <linux/seq_file.h>
#include <sound/core.h>

/* buffer for information */
struct snd_info_buffer { … };

#define SNDRV_INFO_CONTENT_TEXT …
#define SNDRV_INFO_CONTENT_DATA …

struct snd_info_entry;

struct snd_info_entry_text { … };

struct snd_info_entry_ops { … };

struct snd_info_entry { … };

#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS)
int snd_info_minor_register(void);
#else
#define snd_info_minor_register …
#endif


#ifdef CONFIG_SND_PROC_FS

extern struct snd_info_entry *snd_seq_root;
#ifdef CONFIG_SND_OSSEMUL
extern struct snd_info_entry *snd_oss_root;
void snd_card_info_read_oss(struct snd_info_buffer *buffer);
#else
#define snd_oss_root …
static inline void snd_card_info_read_oss(struct snd_info_buffer *buffer) {}
#endif

/**
 * snd_iprintf - printf on the procfs buffer
 * @buf: the procfs buffer
 * @fmt: the printf format
 *
 * Outputs the string on the procfs buffer just like printf().
 *
 * Return: zero for success, or a negative error code.
 */
#define snd_iprintf(buf, fmt, args...) …

int snd_info_init(void);
int snd_info_done(void);

int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len);
const char *snd_info_get_str(char *dest, const char *src, int len);
struct snd_info_entry *snd_info_create_module_entry(struct module *module,
					       const char *name,
					       struct snd_info_entry *parent);
struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
					     const char *name,
					     struct snd_info_entry *parent);
void snd_info_free_entry(struct snd_info_entry *entry);

int snd_info_card_create(struct snd_card *card);
int snd_info_card_register(struct snd_card *card);
int snd_info_card_free(struct snd_card *card);
void snd_info_card_disconnect(struct snd_card *card);
void snd_info_card_id_change(struct snd_card *card);
int snd_info_register(struct snd_info_entry *entry);

/* for card drivers */
static inline int snd_card_proc_new(struct snd_card *card, const char *name,
				    struct snd_info_entry **entryp)
{ … }

static inline void snd_info_set_text_ops(struct snd_info_entry *entry, 
	void *private_data,
	void (*read)(struct snd_info_entry *, struct snd_info_buffer *))
{ … }

int snd_card_rw_proc_new(struct snd_card *card, const char *name,
			 void *private_data,
			 void (*read)(struct snd_info_entry *,
				      struct snd_info_buffer *),
			 void (*write)(struct snd_info_entry *entry,
				       struct snd_info_buffer *buffer));

int snd_info_check_reserved_words(const char *str);

#else

#define snd_seq_root …
#define snd_oss_root …

static inline int snd_iprintf(struct snd_info_buffer *buffer, char *fmt, ...) { return 0; }
static inline int snd_info_init(void) { return 0; }
static inline int snd_info_done(void) { return 0; }

static inline int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) { return 0; }
static inline char *snd_info_get_str(char *dest, char *src, int len) { return NULL; }
static inline struct snd_info_entry *snd_info_create_module_entry(struct module *module, const char *name, struct snd_info_entry *parent) { return NULL; }
static inline struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, const char *name, struct snd_info_entry *parent) { return NULL; }
static inline void snd_info_free_entry(struct snd_info_entry *entry) { ; }

static inline int snd_info_card_create(struct snd_card *card) { return 0; }
static inline int snd_info_card_register(struct snd_card *card) { return 0; }
static inline int snd_info_card_free(struct snd_card *card) { return 0; }
static inline void snd_info_card_disconnect(struct snd_card *card) { }
static inline void snd_info_card_id_change(struct snd_card *card) { }
static inline int snd_info_register(struct snd_info_entry *entry) { return 0; }

static inline int snd_card_proc_new(struct snd_card *card, const char *name,
				    struct snd_info_entry **entryp) { return -EINVAL; }
static inline void snd_info_set_text_ops(struct snd_info_entry *entry __attribute__((unused)),
					 void *private_data,
					 void (*read)(struct snd_info_entry *, struct snd_info_buffer *)) {}
static inline int snd_card_rw_proc_new(struct snd_card *card, const char *name,
				       void *private_data,
				       void (*read)(struct snd_info_entry *,
						    struct snd_info_buffer *),
				       void (*write)(struct snd_info_entry *entry,
						     struct snd_info_buffer *buffer))
{
	return 0;
}
static inline int snd_info_check_reserved_words(const char *str) { return 1; }

#endif

/**
 * snd_card_ro_proc_new - Create a read-only text proc file entry for the card
 * @card: the card instance
 * @name: the file name
 * @private_data: the arbitrary private data
 * @read: the read callback
 *
 * This proc file entry will be registered via snd_card_register() call, and
 * it will be removed automatically at the card removal, too.
 */
static inline int
snd_card_ro_proc_new(struct snd_card *card, const char *name,
		     void *private_data,
		     void (*read)(struct snd_info_entry *,
				  struct snd_info_buffer *))
{ … }

/*
 * OSS info part
 */

#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS)

#define SNDRV_OSS_INFO_DEV_AUDIO …
#define SNDRV_OSS_INFO_DEV_SYNTH …
#define SNDRV_OSS_INFO_DEV_MIDI …
#define SNDRV_OSS_INFO_DEV_TIMERS …
#define SNDRV_OSS_INFO_DEV_MIXERS …

#define SNDRV_OSS_INFO_DEV_COUNT …

int snd_oss_info_register(int dev, int num, char *string);
#define snd_oss_info_unregister(dev, num) …

#endif /* CONFIG_SND_OSSEMUL && CONFIG_SND_PROC_FS */

#endif /* __SOUND_INFO_H */