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 snd_card *card;
  86         struct module *module;
  87         void *private_data;
  88         void (*private_free)(struct snd_info_entry *entry);
  89         struct proc_dir_entry *p;
  90         struct mutex access;
  91         struct list_head children;
  92         struct list_head list;
  93 };
  94
  95 #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS)
  96 int snd_info_minor_register(void);
  97 #else
  98 #define snd_info_minor_register()       0
  99 #endif
 100
 101
 102 #ifdef CONFIG_SND_PROC_FS
 103
 104 extern struct snd_info_entry *snd_seq_root;
 105 #ifdef CONFIG_SND_OSSEMUL
 106 extern struct snd_info_entry *snd_oss_root;
 107 void snd_card_info_read_oss(struct snd_info_buffer *buffer);
 108 #else
 109 #define snd_oss_root NULL
 110 static inline void snd_card_info_read_oss(struct snd_info_buffer *buffer) {}
 111 #endif
 112
 113 /**
 114  * snd_iprintf - printf on the procfs buffer
 115  * @buf: the procfs buffer
 116  * @fmt: the printf format
 117  *
 118  * Outputs the string on the procfs buffer just like printf().
 119  *
 120  * Return: zero for success, or a negative error code.
 121  */
 122 #define snd_iprintf(buf, fmt, args...) \
 123         seq_printf((struct seq_file *)(buf)->buffer, fmt, ##args)
 124
 125 int snd_info_init(void);
 126 int snd_info_done(void);
 127
 128 int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len);
 129 const char *snd_info_get_str(char *dest, const char *src, int len);
 130 struct snd_info_entry *snd_info_create_module_entry(struct module *module,
 131                                                const char *name,
 132                                                struct snd_info_entry *parent);
 133 struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
 134                                              const char *name,
 135                                              struct snd_info_entry *parent);
 136 void snd_info_free_entry(struct snd_info_entry *entry);
 137 int snd_info_store_text(struct snd_info_entry *entry);
 138 int snd_info_restore_text(struct snd_info_entry *entry);
 139
 140 int snd_info_card_create(struct snd_card *card);
 141 int snd_info_card_register(struct snd_card *card);
 142 int snd_info_card_free(struct snd_card *card);
 143 void snd_info_card_disconnect(struct snd_card *card);
 144 void snd_info_card_id_change(struct snd_card *card);
 145 int snd_info_register(struct snd_info_entry *entry);
 146
 147 /* for card drivers */
 148 static inline int snd_card_proc_new(struct snd_card *card, const char *name,
 149                                     struct snd_info_entry **entryp)
 150 {
 151         *entryp = snd_info_create_card_entry(card, name, card->proc_root);
 152         return *entryp ? 0 : -ENOMEM;
 153 }
 154
 155 static inline void snd_info_set_text_ops(struct snd_info_entry *entry,
 156         void *private_data,
 157         void (*read)(struct snd_info_entry *, struct snd_info_buffer *))
 158 {
 159         entry->private_data = private_data;
 160         entry->c.text.read = read;
 161 }
 162
 163 int snd_info_check_reserved_words(const char *str);
 164
 165 #else
 166
 167 #define snd_seq_root NULL
 168 #define snd_oss_root NULL
 169
 170 static inline int snd_iprintf(struct snd_info_buffer *buffer, char *fmt, ...) { return 0; }
 171 static inline int snd_info_init(void) { return 0; }
 172 static inline int snd_info_done(void) { return 0; }
 173
 174 static inline int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) { return 0; }
 175 static inline char *snd_info_get_str(char *dest, char *src, int len) { return NULL; }
 176 static inline struct snd_info_entry *snd_info_create_module_entry(struct module *module, const char *name, struct snd_info_entry *parent) { return NULL; }
 177 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; }
 178 static inline void snd_info_free_entry(struct snd_info_entry *entry) { ; }
 179
 180 static inline int snd_info_card_create(struct snd_card *card) { return 0; }
 181 static inline int snd_info_card_register(struct snd_card *card) { return 0; }
 182 static inline int snd_info_card_free(struct snd_card *card) { return 0; }
 183 static inline void snd_info_card_disconnect(struct snd_card *card) { }
 184 static inline void snd_info_card_id_change(struct snd_card *card) { }
 185 static inline int snd_info_register(struct snd_info_entry *entry) { return 0; }
 186
 187 static inline int snd_card_proc_new(struct snd_card *card, const char *name,
 188                                     struct snd_info_entry **entryp) { return -EINVAL; }
 189 static inline void snd_info_set_text_ops(struct snd_info_entry *entry __attribute__((unused)),
 190                                          void *private_data,
 191                                          void (*read)(struct snd_info_entry *, struct snd_info_buffer *)) {}
 192 static inline int snd_info_check_reserved_words(const char *str) { return 1; }
 193
 194 #endif
 195
 196 /*
 197  * OSS info part
 198  */
 199
 200 #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_SND_PROC_FS)
 201
 202 #define SNDRV_OSS_INFO_DEV_AUDIO        0
 203 #define SNDRV_OSS_INFO_DEV_SYNTH        1
 204 #define SNDRV_OSS_INFO_DEV_MIDI         2
 205 #define SNDRV_OSS_INFO_DEV_TIMERS       4
 206 #define SNDRV_OSS_INFO_DEV_MIXERS       5
 207
 208 #define SNDRV_OSS_INFO_DEV_COUNT        6
 209
 210 int snd_oss_info_register(int dev, int num, char *string);
 211 #define snd_oss_info_unregister(dev, num) snd_oss_info_register(dev, num, NULL)
 212
 213 #endif /* CONFIG_SND_OSSEMUL && CONFIG_SND_PROC_FS */
 214
 215 #endif /* __SOUND_INFO_H */