/* 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 <perex@perex.cz> */ #include <linux/poll.h>#include <linux/seq_file.h>#include <sound/core.h> /* buffer for information */struct snd_info_buffer {	char *buffer;		/* pointer to begin of buffer */	unsigned int curr;	/* current position in buffer */	unsigned int size;	/* current size */	unsigned int len;	/* total length of buffer */	int stop;		/* stop flag */	int error;		/* error code */}; #define SNDRV_INFO_CONTENT_TEXT		0#define SNDRV_INFO_CONTENT_DATA		1 struct snd_info_entry; struct snd_info_entry_text {	void (*read)(struct snd_info_entry *entry,		     struct snd_info_buffer *buffer);	void (*write)(struct snd_info_entry *entry,		      struct snd_info_buffer *buffer);}; struct snd_info_entry_ops {	int (*open)(struct snd_info_entry *entry,		    unsigned short mode, void **file_private_data);	int (*release)(struct snd_info_entry *entry,		       unsigned short mode, void *file_private_data);	ssize_t (*read)(struct snd_info_entry *entry, void *file_private_data,			struct file *file, char __user *buf,			size_t count, loff_t pos);	ssize_t (*write)(struct snd_info_entry *entry, void *file_private_data,			 struct file *file, const char __user *buf,			 size_t count, loff_t pos);	loff_t (*llseek)(struct snd_info_entry *entry,			 void *file_private_data, struct file *file,			 loff_t offset, int orig);	__poll_t (*poll)(struct snd_info_entry *entry,			     void *file_private_data, struct file *file,			     poll_table *wait);	int (*ioctl)(struct snd_info_entry *entry, void *file_private_data,		     struct file *file, unsigned int cmd, unsigned long arg);	int (*mmap)(struct snd_info_entry *entry, void *file_private_data,		    struct inode *inode, struct file *file,		    struct vm_area_struct *vma);}; struct snd_info_entry {	const char *name;	umode_t mode;	long size;	unsigned short content;	union {		struct snd_info_entry_text text;		const struct snd_info_entry_ops *ops;	} c;	struct snd_info_entry *parent;	struct module *module;	void *private_data;	void (*private_free)(struct snd_info_entry *entry);	struct proc_dir_entry *p;	struct mutex access;	struct list_head children;	struct list_head list;}; #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS)int snd_info_minor_register(void);#else#define snd_info_minor_register()	0#endif  #ifdef CONFIG_SND_PROC_FS extern struct snd_info_entry *snd_seq_root;#ifdef CONFIG_SND_OSSEMULextern struct snd_info_entry *snd_oss_root;void snd_card_info_read_oss(struct snd_info_buffer *buffer);#else#define snd_oss_root NULLstatic 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...) \	seq_printf((struct seq_file *)(buf)->buffer, 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){	*entryp = snd_info_create_card_entry(card, name, card->proc_root);	return *entryp ? 0 : -ENOMEM;} 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 *)){	entry->private_data = private_data;	entry->c.text.read = read;} 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 NULL#define snd_oss_root NULL 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 intsnd_card_ro_proc_new(struct snd_card *card, const char *name,		     void *private_data,		     void (*read)(struct snd_info_entry *,				  struct snd_info_buffer *)){	return snd_card_rw_proc_new(card, name, private_data, read, NULL);} /* * OSS info part */ #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS) #define SNDRV_OSS_INFO_DEV_AUDIO	0#define SNDRV_OSS_INFO_DEV_SYNTH	1#define SNDRV_OSS_INFO_DEV_MIDI		2#define SNDRV_OSS_INFO_DEV_TIMERS	4#define SNDRV_OSS_INFO_DEV_MIXERS	5 #define SNDRV_OSS_INFO_DEV_COUNT	6 int snd_oss_info_register(int dev, int num, char *string);#define snd_oss_info_unregister(dev, num) snd_oss_info_register(dev, num, NULL) #endif /* CONFIG_SND_OSSEMUL && CONFIG_SND_PROC_FS */ #endif /* __SOUND_INFO_H */