1 /* SPDX-License-Identifier: GPL-2.0-or-later */
6 * Header file for info interface
7 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
10 #include <linux/poll.h>
11 #include <linux/seq_file.h>
12 #include <sound/core.h>
14 /* buffer for information */
15 struct snd_info_buffer {
16 char *buffer; /* pointer to begin of buffer */
17 unsigned int curr; /* current position in buffer */
18 unsigned int size; /* current size */
19 unsigned int len; /* total length of buffer */
20 int stop; /* stop flag */
21 int error; /* error code */
24 #define SNDRV_INFO_CONTENT_TEXT 0
25 #define SNDRV_INFO_CONTENT_DATA 1
27 struct snd_info_entry;
29 struct snd_info_entry_text {
30 void (*read)(struct snd_info_entry *entry,
31 struct snd_info_buffer *buffer);
32 void (*write)(struct snd_info_entry *entry,
33 struct snd_info_buffer *buffer);
36 struct snd_info_entry_ops {
37 int (*open)(struct snd_info_entry *entry,
38 unsigned short mode, void **file_private_data);
39 int (*release)(struct snd_info_entry *entry,
40 unsigned short mode, void *file_private_data);
41 ssize_t (*read)(struct snd_info_entry *entry, void *file_private_data,
42 struct file *file, char __user *buf,
43 size_t count, loff_t pos);
44 ssize_t (*write)(struct snd_info_entry *entry, void *file_private_data,
45 struct file *file, const char __user *buf,
46 size_t count, loff_t pos);
47 loff_t (*llseek)(struct snd_info_entry *entry,
48 void *file_private_data, struct file *file,
49 loff_t offset, int orig);
50 __poll_t (*poll)(struct snd_info_entry *entry,
51 void *file_private_data, struct file *file,
53 int (*ioctl)(struct snd_info_entry *entry, void *file_private_data,
54 struct file *file, unsigned int cmd, unsigned long arg);
55 int (*mmap)(struct snd_info_entry *entry, void *file_private_data,
56 struct inode *inode, struct file *file,
57 struct vm_area_struct *vma);
60 struct snd_info_entry {
64 unsigned short content;
66 struct snd_info_entry_text text;
67 const struct snd_info_entry_ops *ops;
69 struct snd_info_entry *parent;
70 struct module *module;
72 void (*private_free)(struct snd_info_entry *entry);
73 struct proc_dir_entry *p;
75 struct list_head children;
76 struct list_head list;
79 #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS)
80 int snd_info_minor_register(void);
82 #define snd_info_minor_register() 0
86 #ifdef CONFIG_SND_PROC_FS
88 extern struct snd_info_entry *snd_seq_root;
89 #ifdef CONFIG_SND_OSSEMUL
90 extern struct snd_info_entry *snd_oss_root;
91 void snd_card_info_read_oss(struct snd_info_buffer *buffer);
93 #define snd_oss_root NULL
94 static inline void snd_card_info_read_oss(struct snd_info_buffer *buffer) {}
98 * snd_iprintf - printf on the procfs buffer
99 * @buf: the procfs buffer
100 * @fmt: the printf format
102 * Outputs the string on the procfs buffer just like printf().
104 * Return: zero for success, or a negative error code.
106 #define snd_iprintf(buf, fmt, args...) \
107 seq_printf((struct seq_file *)(buf)->buffer, fmt, ##args)
109 int snd_info_init(void);
110 int snd_info_done(void);
112 int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len);
113 const char *snd_info_get_str(char *dest, const char *src, int len);
114 struct snd_info_entry *snd_info_create_module_entry(struct module *module,
116 struct snd_info_entry *parent);
117 struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
119 struct snd_info_entry *parent);
120 void snd_info_free_entry(struct snd_info_entry *entry);
121 int snd_info_store_text(struct snd_info_entry *entry);
122 int snd_info_restore_text(struct snd_info_entry *entry);
124 int snd_info_card_create(struct snd_card *card);
125 int snd_info_card_register(struct snd_card *card);
126 int snd_info_card_free(struct snd_card *card);
127 void snd_info_card_disconnect(struct snd_card *card);
128 void snd_info_card_id_change(struct snd_card *card);
129 int snd_info_register(struct snd_info_entry *entry);
131 /* for card drivers */
132 static inline int snd_card_proc_new(struct snd_card *card, const char *name,
133 struct snd_info_entry **entryp)
135 *entryp = snd_info_create_card_entry(card, name, card->proc_root);
136 return *entryp ? 0 : -ENOMEM;
139 static inline void snd_info_set_text_ops(struct snd_info_entry *entry,
141 void (*read)(struct snd_info_entry *, struct snd_info_buffer *))
143 entry->private_data = private_data;
144 entry->c.text.read = read;
147 int snd_card_rw_proc_new(struct snd_card *card, const char *name,
149 void (*read)(struct snd_info_entry *,
150 struct snd_info_buffer *),
151 void (*write)(struct snd_info_entry *entry,
152 struct snd_info_buffer *buffer));
154 int snd_info_check_reserved_words(const char *str);
158 #define snd_seq_root NULL
159 #define snd_oss_root NULL
161 static inline int snd_iprintf(struct snd_info_buffer *buffer, char *fmt, ...) { return 0; }
162 static inline int snd_info_init(void) { return 0; }
163 static inline int snd_info_done(void) { return 0; }
165 static inline int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) { return 0; }
166 static inline char *snd_info_get_str(char *dest, char *src, int len) { return NULL; }
167 static inline struct snd_info_entry *snd_info_create_module_entry(struct module *module, const char *name, struct snd_info_entry *parent) { return NULL; }
168 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; }
169 static inline void snd_info_free_entry(struct snd_info_entry *entry) { ; }
171 static inline int snd_info_card_create(struct snd_card *card) { return 0; }
172 static inline int snd_info_card_register(struct snd_card *card) { return 0; }
173 static inline int snd_info_card_free(struct snd_card *card) { return 0; }
174 static inline void snd_info_card_disconnect(struct snd_card *card) { }
175 static inline void snd_info_card_id_change(struct snd_card *card) { }
176 static inline int snd_info_register(struct snd_info_entry *entry) { return 0; }
178 static inline int snd_card_proc_new(struct snd_card *card, const char *name,
179 struct snd_info_entry **entryp) { return -EINVAL; }
180 static inline void snd_info_set_text_ops(struct snd_info_entry *entry __attribute__((unused)),
182 void (*read)(struct snd_info_entry *, struct snd_info_buffer *)) {}
183 static inline int snd_card_rw_proc_new(struct snd_card *card, const char *name,
185 void (*read)(struct snd_info_entry *,
186 struct snd_info_buffer *),
187 void (*write)(struct snd_info_entry *entry,
188 struct snd_info_buffer *buffer))
192 static inline int snd_info_check_reserved_words(const char *str) { return 1; }
197 * snd_card_ro_proc_new - Create a read-only text proc file entry for the card
198 * @card: the card instance
199 * @name: the file name
200 * @private_data: the arbitrary private data
201 * @read: the read callback
203 * This proc file entry will be registered via snd_card_register() call, and
204 * it will be removed automatically at the card removal, too.
207 snd_card_ro_proc_new(struct snd_card *card, const char *name,
209 void (*read)(struct snd_info_entry *,
210 struct snd_info_buffer *))
212 return snd_card_rw_proc_new(card, name, private_data, read, NULL);
219 #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS)
221 #define SNDRV_OSS_INFO_DEV_AUDIO 0
222 #define SNDRV_OSS_INFO_DEV_SYNTH 1
223 #define SNDRV_OSS_INFO_DEV_MIDI 2
224 #define SNDRV_OSS_INFO_DEV_TIMERS 4
225 #define SNDRV_OSS_INFO_DEV_MIXERS 5
227 #define SNDRV_OSS_INFO_DEV_COUNT 6
229 int snd_oss_info_register(int dev, int num, char *string);
230 #define snd_oss_info_unregister(dev, num) snd_oss_info_register(dev, num, NULL)
232 #endif /* CONFIG_SND_OSSEMUL && CONFIG_SND_PROC_FS */
234 #endif /* __SOUND_INFO_H */