include/sound/info.h

   1 #ifndef __SOUND_INFO_H
   2 #define __SOUND_INFO_H
   3
   4 /*
   5  *  Header file for info interface
   6  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   7  *
   8  *
   9  *   This program is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU General Public License as published by
  11  *   the Free Software Foundation; either version 2 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This program is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with this program; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  22  *
  23  */
  24
  25 #include <linux/poll.h>
  26 #include <linux/seq_file.h>
  27 #include <sound/core.h>
  28
  29 /* buffer for information */
  30 struct snd_info_buffer {
  31         char *buffer;           /* pointer to begin of buffer */
  32         unsigned int curr;      /* current position in buffer */
  33         unsigned int size;      /* current size */
  34         unsigned int len;       /* total length of buffer */
  35         int stop;               /* stop flag */
  36         int error;              /* error code */
  37 };
  38
  39 #define SNDRV_INFO_CONTENT_TEXT         0
  40 #define SNDRV_INFO_CONTENT_DATA         1
  41
  42 struct snd_info_entry;
  43
  44 struct snd_info_entry_text {
  45         void (*read)(struct snd_info_entry *entry,
  46                      struct snd_info_buffer *buffer);
  47         void (*write)(struct snd_info_entry *entry,
  48                       struct snd_info_buffer *buffer);
  49 };
  50
  51 struct snd_info_entry_ops {
  52         int (*open)(struct snd_info_entry *entry,
  53                     unsigned short mode, void **file_private_data);
  54         int (*release)(struct snd_info_entry *entry,
  55                        unsigned short mode, void *file_private_data);
  56         ssize_t (*read)(struct snd_info_entry *entry, void *file_private_data,
  57                         struct file *file, char __user *buf,
  58                         size_t count, loff_t pos);
  59         ssize_t (*write)(struct snd_info_entry *entry, void *file_private_data,
  60                          struct file *file, const char __user *buf,
  61                          size_t count, loff_t pos);
  62         loff_t (*llseek)(struct snd_info_entry *entry,
  63                          void *file_private_data, struct file *file,
  64                          loff_t offset, int orig);
  65         __poll_t (*poll)(struct snd_info_entry *entry,
  66                              void *file_private_data, struct file *file,
  67                              poll_table *wait);
  68         int (*ioctl)(struct snd_info_entry *entry, void *file_private_data,
  69                      struct file *file, unsigned int cmd, unsigned long arg);
  70         int (*mmap)(struct snd_info_entry *entry, void *file_private_data,
  71                     struct inode *inode, struct file *file,
  72                     struct vm_area_struct *vma);
  73 };
  74
  75 struct snd_info_entry {
  76         const char *name;
  77         umode_t mode;
  78         long size;
  79         unsigned short content;
  80         union {
  81                 struct snd_info_entry_text text;
  82                 struct snd_info_entry_ops *ops;
  83         } c;
  84         struct snd_info_entry *parent;
  85         struct module *module;
  86         void *private_data;
  87         void (*private_free)(struct snd_info_entry *entry);
  88         struct proc_dir_entry *p;
  89         struct mutex access;
  90         struct list_head children;
  91         struct list_head list;
  92 };
  93
  94 #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS)
  95 int snd_info_minor_register(void);
  96 #else
  97 #define snd_info_minor_register()       0
  98 #endif
  99
 100
 101 #ifdef CONFIG_SND_PROC_FS
 102
 103 extern struct snd_info_entry *snd_seq_root;
 104 #ifdef CONFIG_SND_OSSEMUL
 105 extern struct snd_info_entry *snd_oss_root;
 106 void snd_card_info_read_oss(struct snd_info_buffer *buffer);
 107 #else
 108 #define snd_oss_root NULL
 109 static inline void snd_card_info_read_oss(struct snd_info_buffer *buffer) {}
 110 #endif
 111
 112 /**
 113  * snd_iprintf - printf on the procfs buffer
 114  * @buf: the procfs buffer
 115  * @fmt: the printf format
 116  *
 117  * Outputs the string on the procfs buffer just like printf().
 118  *
 119  * Return: zero for success, or a negative error code.
 120  */
 121 #define snd_iprintf(buf, fmt, args...) \
 122         seq_printf((struct seq_file *)(buf)->buffer, fmt, ##args)
 123
 124 int snd_info_init(void);
 125 int snd_info_done(void);
 126
 127 int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len);
 128 const char *snd_info_get_str(char *dest, const char *src, int len);
 129 struct snd_info_entry *snd_info_create_module_entry(struct module *module,
 130                                                const char *name,
 131                                                struct snd_info_entry *parent);
 132 struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
 133                                              const char *name,
 134                                              struct snd_info_entry *parent);
 135 void snd_info_free_entry(struct snd_info_entry *entry);
 136 int snd_info_store_text(struct snd_info_entry *entry);
 137 int snd_info_restore_text(struct snd_info_entry *entry);
 138
 139 int snd_info_card_create(struct snd_card *card);
 140 int snd_info_card_register(struct snd_card *card);
 141 int snd_info_card_free(struct snd_card *card);
 142 void snd_info_card_disconnect(struct snd_card *card);
 143 void snd_info_card_id_change(struct snd_card *card);
 144 int snd_info_register(struct snd_info_entry *entry);
 145
 146 /* for card drivers */
 147 static inline int snd_card_proc_new(struct snd_card *card, const char *name,
 148                                     struct snd_info_entry **entryp)
 149 {
 150         *entryp = snd_info_create_card_entry(card, name, card->proc_root);
 151         return *entryp ? 0 : -ENOMEM;
 152 }
 153
 154 static inline void snd_info_set_text_ops(struct snd_info_entry *entry,
 155         void *private_data,
 156         void (*read)(struct snd_info_entry *, struct snd_info_buffer *))
 157 {
 158         entry->private_data = private_data;
 159         entry->c.text.read = read;
 160 }
 161
 162 int snd_card_rw_proc_new(struct snd_card *card, const char *name,
 163                          void *private_data,
 164                          void (*read)(struct snd_info_entry *,
 165                                       struct snd_info_buffer *),
 166                          void (*write)(struct snd_info_entry *entry,
 167                                        struct snd_info_buffer *buffer));
 168
 169 int snd_info_check_reserved_words(const char *str);
 170
 171 #else
 172
 173 #define snd_seq_root NULL
 174 #define snd_oss_root NULL
 175
 176 static inline int snd_iprintf(struct snd_info_buffer *buffer, char *fmt, ...) { return 0; }
 177 static inline int snd_info_init(void) { return 0; }
 178 static inline int snd_info_done(void) { return 0; }
 179
 180 static inline int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) { return 0; }
 181 static inline char *snd_info_get_str(char *dest, char *src, int len) { return NULL; }
 182 static inline struct snd_info_entry *snd_info_create_module_entry(struct module *module, const char *name, struct snd_info_entry *parent) { return NULL; }
 183 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; }
 184 static inline void snd_info_free_entry(struct snd_info_entry *entry) { ; }
 185
 186 static inline int snd_info_card_create(struct snd_card *card) { return 0; }
 187 static inline int snd_info_card_register(struct snd_card *card) { return 0; }
 188 static inline int snd_info_card_free(struct snd_card *card) { return 0; }
 189 static inline void snd_info_card_disconnect(struct snd_card *card) { }
 190 static inline void snd_info_card_id_change(struct snd_card *card) { }
 191 static inline int snd_info_register(struct snd_info_entry *entry) { return 0; }
 192
 193 static inline int snd_card_proc_new(struct snd_card *card, const char *name,
 194                                     struct snd_info_entry **entryp) { return -EINVAL; }
 195 static inline void snd_info_set_text_ops(struct snd_info_entry *entry __attribute__((unused)),
 196                                          void *private_data,
 197                                          void (*read)(struct snd_info_entry *, struct snd_info_buffer *)) {}
 198 static inline int snd_card_rw_proc_new(struct snd_card *card, const char *name,
 199                                        void *private_data,
 200                                        void (*read)(struct snd_info_entry *,
 201                                                     struct snd_info_buffer *),
 202                                        void (*write)(struct snd_info_entry *entry,
 203                                                      struct snd_info_buffer *buffer))
 204 {
 205         return 0;
 206 }
 207 static inline int snd_info_check_reserved_words(const char *str) { return 1; }
 208
 209 #endif
 210
 211 /**
 212  * snd_card_ro_proc_new - Create a read-only text proc file entry for the card
 213  * @card: the card instance
 214  * @name: the file name
 215  * @private_data: the arbitrary private data
 216  * @read: the read callback
 217  *
 218  * This proc file entry will be registered via snd_card_register() call, and
 219  * it will be removed automatically at the card removal, too.
 220  */
 221 static inline int
 222 snd_card_ro_proc_new(struct snd_card *card, const char *name,
 223                      void *private_data,
 224                      void (*read)(struct snd_info_entry *,
 225                                   struct snd_info_buffer *))
 226 {
 227         return snd_card_rw_proc_new(card, name, private_data, read, NULL);
 228 }
 229
 230 /*
 231  * OSS info part
 232  */
 233
 234 #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS)
 235
 236 #define SNDRV_OSS_INFO_DEV_AUDIO        0
 237 #define SNDRV_OSS_INFO_DEV_SYNTH        1
 238 #define SNDRV_OSS_INFO_DEV_MIDI         2
 239 #define SNDRV_OSS_INFO_DEV_TIMERS       4
 240 #define SNDRV_OSS_INFO_DEV_MIXERS       5
 241
 242 #define SNDRV_OSS_INFO_DEV_COUNT        6
 243
 244 int snd_oss_info_register(int dev, int num, char *string);
 245 #define snd_oss_info_unregister(dev, num) snd_oss_info_register(dev, num, NULL)
 246
 247 #endif /* CONFIG_SND_OSSEMUL && CONFIG_SND_PROC_FS */
 248
 249 #endif /* __SOUND_INFO_H */