1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef __SOUND_INFO_H 3 #define __SOUND_INFO_H 4 5 /* 6 * Header file for info interface 7 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 8 */ 9 10 #include <linux/poll.h> 11 #include <linux/seq_file.h> 12 #include <sound/core.h> 13 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 */ 22 }; 23 24 #define SNDRV_INFO_CONTENT_TEXT 0 25 #define SNDRV_INFO_CONTENT_DATA 1 26 27 struct snd_info_entry; 28 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); 34 }; 35 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, 52 poll_table *wait); 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); 58 }; 59 60 struct snd_info_entry { 61 const char *name; 62 umode_t mode; 63 long size; 64 unsigned short content; 65 union { 66 struct snd_info_entry_text text; 67 const struct snd_info_entry_ops *ops; 68 } c; 69 struct snd_info_entry *parent; 70 struct module *module; 71 void *private_data; 72 void (*private_free)(struct snd_info_entry *entry); 73 struct proc_dir_entry *p; 74 struct mutex access; 75 struct list_head children; 76 struct list_head list; 77 }; 78 79 #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS) 80 int snd_info_minor_register(void); 81 #else 82 #define snd_info_minor_register() 0 83 #endif 84 85 86 #ifdef CONFIG_SND_PROC_FS 87 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); 92 #else 93 #define snd_oss_root NULL 94 static inline void snd_card_info_read_oss(struct snd_info_buffer *buffer) {} 95 #endif 96 97 /** 98 * snd_iprintf - printf on the procfs buffer 99 * @buf: the procfs buffer 100 * @fmt: the printf format 101 * 102 * Outputs the string on the procfs buffer just like printf(). 103 * 104 * Return: zero for success, or a negative error code. 105 */ 106 #define snd_iprintf(buf, fmt, args...) \ 107 seq_printf((struct seq_file *)(buf)->buffer, fmt, ##args) 108 109 int snd_info_init(void); 110 int snd_info_done(void); 111 112 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, 115 const char *name, 116 struct snd_info_entry *parent); 117 struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, 118 const char *name, 119 struct snd_info_entry *parent); 120 void snd_info_free_entry(struct snd_info_entry *entry); 121 122 int snd_info_card_create(struct snd_card *card); 123 int snd_info_card_register(struct snd_card *card); 124 int snd_info_card_free(struct snd_card *card); 125 void snd_info_card_disconnect(struct snd_card *card); 126 void snd_info_card_id_change(struct snd_card *card); 127 int snd_info_register(struct snd_info_entry *entry); 128 129 /* for card drivers */ 130 static inline int snd_card_proc_new(struct snd_card *card, const char *name, 131 struct snd_info_entry **entryp) 132 { 133 *entryp = snd_info_create_card_entry(card, name, card->proc_root); 134 return *entryp ? 0 : -ENOMEM; 135 } 136 137 static inline void snd_info_set_text_ops(struct snd_info_entry *entry, 138 void *private_data, 139 void (*read)(struct snd_info_entry *, struct snd_info_buffer *)) 140 { 141 entry->private_data = private_data; 142 entry->c.text.read = read; 143 } 144 145 int snd_card_rw_proc_new(struct snd_card *card, const char *name, 146 void *private_data, 147 void (*read)(struct snd_info_entry *, 148 struct snd_info_buffer *), 149 void (*write)(struct snd_info_entry *entry, 150 struct snd_info_buffer *buffer)); 151 152 int snd_info_check_reserved_words(const char *str); 153 154 #else 155 156 #define snd_seq_root NULL 157 #define snd_oss_root NULL 158 159 static inline int snd_iprintf(struct snd_info_buffer *buffer, char *fmt, ...) { return 0; } 160 static inline int snd_info_init(void) { return 0; } 161 static inline int snd_info_done(void) { return 0; } 162 163 static inline int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) { return 0; } 164 static inline char *snd_info_get_str(char *dest, char *src, int len) { return NULL; } 165 static inline struct snd_info_entry *snd_info_create_module_entry(struct module *module, const char *name, struct snd_info_entry *parent) { return NULL; } 166 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; } 167 static inline void snd_info_free_entry(struct snd_info_entry *entry) { ; } 168 169 static inline int snd_info_card_create(struct snd_card *card) { return 0; } 170 static inline int snd_info_card_register(struct snd_card *card) { return 0; } 171 static inline int snd_info_card_free(struct snd_card *card) { return 0; } 172 static inline void snd_info_card_disconnect(struct snd_card *card) { } 173 static inline void snd_info_card_id_change(struct snd_card *card) { } 174 static inline int snd_info_register(struct snd_info_entry *entry) { return 0; } 175 176 static inline int snd_card_proc_new(struct snd_card *card, const char *name, 177 struct snd_info_entry **entryp) { return -EINVAL; } 178 static inline void snd_info_set_text_ops(struct snd_info_entry *entry __attribute__((unused)), 179 void *private_data, 180 void (*read)(struct snd_info_entry *, struct snd_info_buffer *)) {} 181 static inline int snd_card_rw_proc_new(struct snd_card *card, const char *name, 182 void *private_data, 183 void (*read)(struct snd_info_entry *, 184 struct snd_info_buffer *), 185 void (*write)(struct snd_info_entry *entry, 186 struct snd_info_buffer *buffer)) 187 { 188 return 0; 189 } 190 static inline int snd_info_check_reserved_words(const char *str) { return 1; } 191 192 #endif 193 194 /** 195 * snd_card_ro_proc_new - Create a read-only text proc file entry for the card 196 * @card: the card instance 197 * @name: the file name 198 * @private_data: the arbitrary private data 199 * @read: the read callback 200 * 201 * This proc file entry will be registered via snd_card_register() call, and 202 * it will be removed automatically at the card removal, too. 203 */ 204 static inline int 205 snd_card_ro_proc_new(struct snd_card *card, const char *name, 206 void *private_data, 207 void (*read)(struct snd_info_entry *, 208 struct snd_info_buffer *)) 209 { 210 return snd_card_rw_proc_new(card, name, private_data, read, NULL); 211 } 212 213 /* 214 * OSS info part 215 */ 216 217 #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS) 218 219 #define SNDRV_OSS_INFO_DEV_AUDIO 0 220 #define SNDRV_OSS_INFO_DEV_SYNTH 1 221 #define SNDRV_OSS_INFO_DEV_MIDI 2 222 #define SNDRV_OSS_INFO_DEV_TIMERS 4 223 #define SNDRV_OSS_INFO_DEV_MIXERS 5 224 225 #define SNDRV_OSS_INFO_DEV_COUNT 6 226 227 int snd_oss_info_register(int dev, int num, char *string); 228 #define snd_oss_info_unregister(dev, num) snd_oss_info_register(dev, num, NULL) 229 230 #endif /* CONFIG_SND_OSSEMUL && CONFIG_SND_PROC_FS */ 231 232 #endif /* __SOUND_INFO_H */ 233