235 lines
7.9 KiB
C
235 lines
7.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef __SOUND_INFO_H
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#define __SOUND_INFO_H
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/*
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* Header file for info interface
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*/
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#include <linux/poll.h>
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#include <linux/seq_file.h>
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#include <sound/core.h>
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/* buffer for information */
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struct snd_info_buffer {
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char *buffer; /* pointer to begin of buffer */
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unsigned int curr; /* current position in buffer */
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unsigned int size; /* current size */
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unsigned int len; /* total length of buffer */
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int stop; /* stop flag */
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int error; /* error code */
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};
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#define SNDRV_INFO_CONTENT_TEXT 0
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#define SNDRV_INFO_CONTENT_DATA 1
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struct snd_info_entry;
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struct snd_info_entry_text {
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void (*read)(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer);
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void (*write)(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer);
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};
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struct snd_info_entry_ops {
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int (*open)(struct snd_info_entry *entry,
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unsigned short mode, void **file_private_data);
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int (*release)(struct snd_info_entry *entry,
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unsigned short mode, void *file_private_data);
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ssize_t (*read)(struct snd_info_entry *entry, void *file_private_data,
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struct file *file, char __user *buf,
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size_t count, loff_t pos);
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ssize_t (*write)(struct snd_info_entry *entry, void *file_private_data,
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struct file *file, const char __user *buf,
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size_t count, loff_t pos);
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loff_t (*llseek)(struct snd_info_entry *entry,
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void *file_private_data, struct file *file,
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loff_t offset, int orig);
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__poll_t (*poll)(struct snd_info_entry *entry,
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void *file_private_data, struct file *file,
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poll_table *wait);
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int (*ioctl)(struct snd_info_entry *entry, void *file_private_data,
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struct file *file, unsigned int cmd, unsigned long arg);
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int (*mmap)(struct snd_info_entry *entry, void *file_private_data,
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struct inode *inode, struct file *file,
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struct vm_area_struct *vma);
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};
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struct snd_info_entry {
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const char *name;
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umode_t mode;
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long size;
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unsigned short content;
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union {
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struct snd_info_entry_text text;
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struct snd_info_entry_ops *ops;
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} c;
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struct snd_info_entry *parent;
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struct module *module;
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void *private_data;
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void (*private_free)(struct snd_info_entry *entry);
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struct proc_dir_entry *p;
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struct mutex access;
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struct list_head children;
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struct list_head list;
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};
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#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS)
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int snd_info_minor_register(void);
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#else
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#define snd_info_minor_register() 0
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#endif
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#ifdef CONFIG_SND_PROC_FS
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extern struct snd_info_entry *snd_seq_root;
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#ifdef CONFIG_SND_OSSEMUL
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extern struct snd_info_entry *snd_oss_root;
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void snd_card_info_read_oss(struct snd_info_buffer *buffer);
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#else
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#define snd_oss_root NULL
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static inline void snd_card_info_read_oss(struct snd_info_buffer *buffer) {}
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#endif
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/**
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* snd_iprintf - printf on the procfs buffer
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* @buf: the procfs buffer
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* @fmt: the printf format
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*
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* Outputs the string on the procfs buffer just like printf().
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*
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* Return: zero for success, or a negative error code.
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*/
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#define snd_iprintf(buf, fmt, args...) \
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seq_printf((struct seq_file *)(buf)->buffer, fmt, ##args)
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int snd_info_init(void);
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int snd_info_done(void);
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int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len);
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const char *snd_info_get_str(char *dest, const char *src, int len);
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struct snd_info_entry *snd_info_create_module_entry(struct module *module,
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const char *name,
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struct snd_info_entry *parent);
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struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
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const char *name,
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struct snd_info_entry *parent);
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void snd_info_free_entry(struct snd_info_entry *entry);
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int snd_info_store_text(struct snd_info_entry *entry);
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int snd_info_restore_text(struct snd_info_entry *entry);
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int snd_info_card_create(struct snd_card *card);
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int snd_info_card_register(struct snd_card *card);
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int snd_info_card_free(struct snd_card *card);
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void snd_info_card_disconnect(struct snd_card *card);
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void snd_info_card_id_change(struct snd_card *card);
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int snd_info_register(struct snd_info_entry *entry);
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/* for card drivers */
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static inline int snd_card_proc_new(struct snd_card *card, const char *name,
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struct snd_info_entry **entryp)
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{
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*entryp = snd_info_create_card_entry(card, name, card->proc_root);
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return *entryp ? 0 : -ENOMEM;
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}
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static inline void snd_info_set_text_ops(struct snd_info_entry *entry,
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void *private_data,
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void (*read)(struct snd_info_entry *, struct snd_info_buffer *))
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{
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entry->private_data = private_data;
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entry->c.text.read = read;
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}
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int snd_card_rw_proc_new(struct snd_card *card, const char *name,
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void *private_data,
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void (*read)(struct snd_info_entry *,
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struct snd_info_buffer *),
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void (*write)(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer));
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int snd_info_check_reserved_words(const char *str);
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#else
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#define snd_seq_root NULL
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#define snd_oss_root NULL
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static inline int snd_iprintf(struct snd_info_buffer *buffer, char *fmt, ...) { return 0; }
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static inline int snd_info_init(void) { return 0; }
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static inline int snd_info_done(void) { return 0; }
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static inline int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) { return 0; }
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static inline char *snd_info_get_str(char *dest, char *src, int len) { return NULL; }
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static inline struct snd_info_entry *snd_info_create_module_entry(struct module *module, const char *name, struct snd_info_entry *parent) { return NULL; }
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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; }
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static inline void snd_info_free_entry(struct snd_info_entry *entry) { ; }
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static inline int snd_info_card_create(struct snd_card *card) { return 0; }
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static inline int snd_info_card_register(struct snd_card *card) { return 0; }
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static inline int snd_info_card_free(struct snd_card *card) { return 0; }
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static inline void snd_info_card_disconnect(struct snd_card *card) { }
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static inline void snd_info_card_id_change(struct snd_card *card) { }
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static inline int snd_info_register(struct snd_info_entry *entry) { return 0; }
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static inline int snd_card_proc_new(struct snd_card *card, const char *name,
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struct snd_info_entry **entryp) { return -EINVAL; }
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static inline void snd_info_set_text_ops(struct snd_info_entry *entry __attribute__((unused)),
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void *private_data,
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void (*read)(struct snd_info_entry *, struct snd_info_buffer *)) {}
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static inline int snd_card_rw_proc_new(struct snd_card *card, const char *name,
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void *private_data,
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void (*read)(struct snd_info_entry *,
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struct snd_info_buffer *),
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void (*write)(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer))
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{
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return 0;
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}
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static inline int snd_info_check_reserved_words(const char *str) { return 1; }
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#endif
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/**
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* snd_card_ro_proc_new - Create a read-only text proc file entry for the card
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* @card: the card instance
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* @name: the file name
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* @private_data: the arbitrary private data
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* @read: the read callback
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*
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* This proc file entry will be registered via snd_card_register() call, and
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* it will be removed automatically at the card removal, too.
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*/
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static inline int
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snd_card_ro_proc_new(struct snd_card *card, const char *name,
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void *private_data,
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void (*read)(struct snd_info_entry *,
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struct snd_info_buffer *))
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{
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return snd_card_rw_proc_new(card, name, private_data, read, NULL);
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}
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/*
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* OSS info part
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*/
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#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS)
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#define SNDRV_OSS_INFO_DEV_AUDIO 0
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#define SNDRV_OSS_INFO_DEV_SYNTH 1
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#define SNDRV_OSS_INFO_DEV_MIDI 2
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#define SNDRV_OSS_INFO_DEV_TIMERS 4
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#define SNDRV_OSS_INFO_DEV_MIXERS 5
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#define SNDRV_OSS_INFO_DEV_COUNT 6
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int snd_oss_info_register(int dev, int num, char *string);
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#define snd_oss_info_unregister(dev, num) snd_oss_info_register(dev, num, NULL)
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#endif /* CONFIG_SND_OSSEMUL && CONFIG_SND_PROC_FS */
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#endif /* __SOUND_INFO_H */
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