include/sound/core.h

   1 #ifndef __SOUND_CORE_H
   2 #define __SOUND_CORE_H
   3
   4 /*
   5  *  Main header file for the ALSA driver
   6  *  Copyright (c) 1994-2001 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/module.h>
  26 #include <linux/sched.h>                /* wake_up() */
  27 #include <linux/mutex.h>                /* struct mutex */
  28 #include <linux/rwsem.h>                /* struct rw_semaphore */
  29 #include <linux/pm.h>                   /* pm_message_t */
  30 #include <linux/device.h>
  31 #include <linux/stringify.h>
  32
  33 /* number of supported soundcards */
  34 #ifdef CONFIG_SND_DYNAMIC_MINORS
  35 #define SNDRV_CARDS 32
  36 #else
  37 #define SNDRV_CARDS 8           /* don't change - minor numbers */
  38 #endif
  39
  40 #define CONFIG_SND_MAJOR        116     /* standard configuration */
  41
  42 /* forward declarations */
  43 #ifdef CONFIG_PCI
  44 struct pci_dev;
  45 #endif
  46
  47 /* device allocation stuff */
  48
  49 #define SNDRV_DEV_TYPE_RANGE_SIZE               0x1000
  50
  51 typedef int __bitwise snd_device_type_t;
  52 #define SNDRV_DEV_TOPLEVEL      ((__force snd_device_type_t) 0)
  53 #define SNDRV_DEV_CONTROL       ((__force snd_device_type_t) 1)
  54 #define SNDRV_DEV_LOWLEVEL_PRE  ((__force snd_device_type_t) 2)
  55 #define SNDRV_DEV_LOWLEVEL_NORMAL ((__force snd_device_type_t) 0x1000)
  56 #define SNDRV_DEV_PCM           ((__force snd_device_type_t) 0x1001)
  57 #define SNDRV_DEV_RAWMIDI       ((__force snd_device_type_t) 0x1002)
  58 #define SNDRV_DEV_TIMER         ((__force snd_device_type_t) 0x1003)
  59 #define SNDRV_DEV_SEQUENCER     ((__force snd_device_type_t) 0x1004)
  60 #define SNDRV_DEV_HWDEP         ((__force snd_device_type_t) 0x1005)
  61 #define SNDRV_DEV_INFO          ((__force snd_device_type_t) 0x1006)
  62 #define SNDRV_DEV_BUS           ((__force snd_device_type_t) 0x1007)
  63 #define SNDRV_DEV_CODEC         ((__force snd_device_type_t) 0x1008)
  64 #define SNDRV_DEV_JACK          ((__force snd_device_type_t) 0x1009)
  65 #define SNDRV_DEV_LOWLEVEL      ((__force snd_device_type_t) 0x2000)
  66
  67 typedef int __bitwise snd_device_state_t;
  68 #define SNDRV_DEV_BUILD         ((__force snd_device_state_t) 0)
  69 #define SNDRV_DEV_REGISTERED    ((__force snd_device_state_t) 1)
  70 #define SNDRV_DEV_DISCONNECTED  ((__force snd_device_state_t) 2)
  71
  72 typedef int __bitwise snd_device_cmd_t;
  73 #define SNDRV_DEV_CMD_PRE       ((__force snd_device_cmd_t) 0)
  74 #define SNDRV_DEV_CMD_NORMAL    ((__force snd_device_cmd_t) 1)
  75 #define SNDRV_DEV_CMD_POST      ((__force snd_device_cmd_t) 2)
  76
  77 struct snd_device;
  78
  79 struct snd_device_ops {
  80         int (*dev_free)(struct snd_device *dev);
  81         int (*dev_register)(struct snd_device *dev);
  82         int (*dev_disconnect)(struct snd_device *dev);
  83 };
  84
  85 struct snd_device {
  86         struct list_head list;          /* list of registered devices */
  87         struct snd_card *card;          /* card which holds this device */
  88         snd_device_state_t state;       /* state of the device */
  89         snd_device_type_t type;         /* device type */
  90         void *device_data;              /* device structure */
  91         struct snd_device_ops *ops;     /* operations */
  92 };
  93
  94 #define snd_device(n) list_entry(n, struct snd_device, list)
  95
  96 /* monitor files for graceful shutdown (hotplug) */
  97
  98 struct snd_monitor_file {
  99         struct file *file;
 100         struct snd_monitor_file *next;
 101         const struct file_operations *disconnected_f_op;
 102         struct list_head shutdown_list;
 103 };
 104
 105 /* main structure for soundcard */
 106
 107 struct snd_card {
 108         int number;                     /* number of soundcard (index to
 109                                                                 snd_cards) */
 110
 111         char id[16];                    /* id string of this card */
 112         char driver[16];                /* driver name */
 113         char shortname[32];             /* short name of this soundcard */
 114         char longname[80];              /* name of this soundcard */
 115         char mixername[80];             /* mixer name */
 116         char components[128];           /* card components delimited with
 117                                                                 space */
 118         struct module *module;          /* top-level module */
 119
 120         void *private_data;             /* private data for soundcard */
 121         void (*private_free) (struct snd_card *card); /* callback for freeing of
 122                                                                 private data */
 123         struct list_head devices;       /* devices */
 124
 125         unsigned int last_numid;        /* last used numeric ID */
 126         struct rw_semaphore controls_rwsem;     /* controls list lock */
 127         rwlock_t ctl_files_rwlock;      /* ctl_files list lock */
 128         int controls_count;             /* count of all controls */
 129         int user_ctl_count;             /* count of all user controls */
 130         struct list_head controls;      /* all controls for this card */
 131         struct list_head ctl_files;     /* active control files */
 132
 133         struct snd_info_entry *proc_root;       /* root for soundcard specific files */
 134         struct snd_info_entry *proc_id; /* the card id */
 135         struct proc_dir_entry *proc_root_link;  /* number link to real id */
 136
 137         struct snd_monitor_file *files; /* all files associated to this card */
 138         struct snd_shutdown_f_ops *s_f_ops; /* file operations in the shutdown
 139                                                                 state */
 140         spinlock_t files_lock;          /* lock the files for this card */
 141         int shutdown;                   /* this card is going down */
 142         int free_on_last_close;         /* free in context of file_release */
 143         wait_queue_head_t shutdown_sleep;
 144         struct device *dev;             /* device assigned to this card */
 145 #ifndef CONFIG_SYSFS_DEPRECATED
 146         struct device *card_dev;        /* cardX object for sysfs */
 147 #endif
 148
 149 #ifdef CONFIG_PM
 150         unsigned int power_state;       /* power state */
 151         struct mutex power_lock;        /* power lock */
 152         wait_queue_head_t power_sleep;
 153 #endif
 154
 155 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
 156         struct snd_mixer_oss *mixer_oss;
 157         int mixer_oss_change_count;
 158 #endif
 159 };
 160
 161 #ifdef CONFIG_PM
 162 static inline void snd_power_lock(struct snd_card *card)
 163 {
 164         mutex_lock(&card->power_lock);
 165 }
 166
 167 static inline void snd_power_unlock(struct snd_card *card)
 168 {
 169         mutex_unlock(&card->power_lock);
 170 }
 171
 172 static inline unsigned int snd_power_get_state(struct snd_card *card)
 173 {
 174         return card->power_state;
 175 }
 176
 177 static inline void snd_power_change_state(struct snd_card *card, unsigned int state)
 178 {
 179         card->power_state = state;
 180         wake_up(&card->power_sleep);
 181 }
 182
 183 /* init.c */
 184 int snd_power_wait(struct snd_card *card, unsigned int power_state);
 185
 186 #else /* ! CONFIG_PM */
 187
 188 #define snd_power_lock(card)            do { (void)(card); } while (0)
 189 #define snd_power_unlock(card)          do { (void)(card); } while (0)
 190 static inline int snd_power_wait(struct snd_card *card, unsigned int state) { return 0; }
 191 #define snd_power_get_state(card)       SNDRV_CTL_POWER_D0
 192 #define snd_power_change_state(card, state)     do { (void)(card); } while (0)
 193
 194 #endif /* CONFIG_PM */
 195
 196 struct snd_minor {
 197         int type;                       /* SNDRV_DEVICE_TYPE_XXX */
 198         int card;                       /* card number */
 199         int device;                     /* device number */
 200         const struct file_operations *f_ops;    /* file operations */
 201         void *private_data;             /* private data for f_ops->open */
 202         struct device *dev;             /* device for sysfs */
 203 };
 204
 205 /* return a device pointer linked to each sound device as a parent */
 206 static inline struct device *snd_card_get_device_link(struct snd_card *card)
 207 {
 208 #ifdef CONFIG_SYSFS_DEPRECATED
 209         return card ? card->dev : NULL;
 210 #else
 211         return card ? card->card_dev : NULL;
 212 #endif
 213 }
 214
 215 /* sound.c */
 216
 217 extern int snd_major;
 218 extern int snd_ecards_limit;
 219 extern struct class *sound_class;
 220
 221 void snd_request_card(int card);
 222
 223 int snd_register_device_for_dev(int type, struct snd_card *card,
 224                                 int dev,
 225                                 const struct file_operations *f_ops,
 226                                 void *private_data,
 227                                 const char *name,
 228                                 struct device *device);
 229
 230 /**
 231  * snd_register_device - Register the ALSA device file for the card
 232  * @type: the device type, SNDRV_DEVICE_TYPE_XXX
 233  * @card: the card instance
 234  * @dev: the device index
 235  * @f_ops: the file operations
 236  * @private_data: user pointer for f_ops->open()
 237  * @name: the device file name
 238  *
 239  * Registers an ALSA device file for the given card.
 240  * The operators have to be set in reg parameter.
 241  *
 242  * This function uses the card's device pointer to link to the
 243  * correct &struct device.
 244  *
 245  * Returns zero if successful, or a negative error code on failure.
 246  */
 247 static inline int snd_register_device(int type, struct snd_card *card, int dev,
 248                                       const struct file_operations *f_ops,
 249                                       void *private_data,
 250                                       const char *name)
 251 {
 252         return snd_register_device_for_dev(type, card, dev, f_ops,
 253                                            private_data, name,
 254                                            snd_card_get_device_link(card));
 255 }
 256
 257 int snd_unregister_device(int type, struct snd_card *card, int dev);
 258 void *snd_lookup_minor_data(unsigned int minor, int type);
 259 int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev,
 260                               struct device_attribute *attr);
 261
 262 #ifdef CONFIG_SND_OSSEMUL
 263 int snd_register_oss_device(int type, struct snd_card *card, int dev,
 264                             const struct file_operations *f_ops, void *private_data,
 265                             const char *name);
 266 int snd_unregister_oss_device(int type, struct snd_card *card, int dev);
 267 void *snd_lookup_oss_minor_data(unsigned int minor, int type);
 268 #endif
 269
 270 int snd_minor_info_init(void);
 271 int snd_minor_info_done(void);
 272
 273 /* sound_oss.c */
 274
 275 #ifdef CONFIG_SND_OSSEMUL
 276 int snd_minor_info_oss_init(void);
 277 int snd_minor_info_oss_done(void);
 278 #else
 279 static inline int snd_minor_info_oss_init(void) { return 0; }
 280 static inline int snd_minor_info_oss_done(void) { return 0; }
 281 #endif
 282
 283 /* memory.c */
 284
 285 int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count);
 286 int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count);
 287
 288 /* init.c */
 289
 290 extern struct snd_card *snd_cards[SNDRV_CARDS];
 291 int snd_card_locked(int card);
 292 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
 293 #define SND_MIXER_OSS_NOTIFY_REGISTER   0
 294 #define SND_MIXER_OSS_NOTIFY_DISCONNECT 1
 295 #define SND_MIXER_OSS_NOTIFY_FREE       2
 296 extern int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int cmd);
 297 #endif
 298
 299 struct snd_card *snd_card_new(int idx, const char *id,
 300                          struct module *module, int extra_size);
 301 int snd_card_disconnect(struct snd_card *card);
 302 int snd_card_free(struct snd_card *card);
 303 int snd_card_free_when_closed(struct snd_card *card);
 304 int snd_card_register(struct snd_card *card);
 305 int snd_card_info_init(void);
 306 int snd_card_info_done(void);
 307 int snd_component_add(struct snd_card *card, const char *component);
 308 int snd_card_file_add(struct snd_card *card, struct file *file);
 309 int snd_card_file_remove(struct snd_card *card, struct file *file);
 310
 311 #ifndef snd_card_set_dev
 312 #define snd_card_set_dev(card, devptr) ((card)->dev = (devptr))
 313 #endif
 314
 315 /* device.c */
 316
 317 int snd_device_new(struct snd_card *card, snd_device_type_t type,
 318                    void *device_data, struct snd_device_ops *ops);
 319 int snd_device_register(struct snd_card *card, void *device_data);
 320 int snd_device_register_all(struct snd_card *card);
 321 int snd_device_disconnect(struct snd_card *card, void *device_data);
 322 int snd_device_disconnect_all(struct snd_card *card);
 323 int snd_device_free(struct snd_card *card, void *device_data);
 324 int snd_device_free_all(struct snd_card *card, snd_device_cmd_t cmd);
 325
 326 /* isadma.c */
 327
 328 #ifdef CONFIG_ISA_DMA_API
 329 #define DMA_MODE_NO_ENABLE      0x0100
 330
 331 void snd_dma_program(unsigned long dma, unsigned long addr, unsigned int size, unsigned short mode);
 332 void snd_dma_disable(unsigned long dma);
 333 unsigned int snd_dma_pointer(unsigned long dma, unsigned int size);
 334 #endif
 335
 336 /* misc.c */
 337 struct resource;
 338 void release_and_free_resource(struct resource *res);
 339
 340 #ifdef CONFIG_SND_VERBOSE_PRINTK
 341 void snd_verbose_printk(const char *file, int line, const char *format, ...)
 342      __attribute__ ((format (printf, 3, 4)));
 343 #endif
 344 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
 345 void snd_verbose_printd(const char *file, int line, const char *format, ...)
 346      __attribute__ ((format (printf, 3, 4)));
 347 #endif
 348
 349 /* --- */
 350
 351 #ifdef CONFIG_SND_VERBOSE_PRINTK
 352 /**
 353  * snd_printk - printk wrapper
 354  * @fmt: format string
 355  *
 356  * Works like printk() but prints the file and the line of the caller
 357  * when configured with CONFIG_SND_VERBOSE_PRINTK.
 358  */
 359 #define snd_printk(fmt, args...) \
 360         snd_verbose_printk(__FILE__, __LINE__, fmt ,##args)
 361 #else
 362 #define snd_printk(fmt, args...) \
 363         printk(fmt ,##args)
 364 #endif
 365
 366 #ifdef CONFIG_SND_DEBUG
 367
 368 #ifdef CONFIG_SND_VERBOSE_PRINTK
 369 /**
 370  * snd_printd - debug printk
 371  * @fmt: format string
 372  *
 373  * Works like snd_printk() for debugging purposes.
 374  * Ignored when CONFIG_SND_DEBUG is not set.
 375  */
 376 #define snd_printd(fmt, args...) \
 377         snd_verbose_printd(__FILE__, __LINE__, fmt ,##args)
 378 #else
 379 #define snd_printd(fmt, args...) \
 380         printk(fmt ,##args)
 381 #endif
 382
 383 /**
 384  * snd_BUG - give a BUG warning message and stack trace
 385  *
 386  * Calls WARN() if CONFIG_SND_DEBUG is set.
 387  * Ignored when CONFIG_SND_DEBUG is not set.
 388  */
 389 #define snd_BUG()               WARN(1, "BUG?\n")
 390
 391 /**
 392  * snd_BUG_ON - debugging check macro
 393  * @cond: condition to evaluate
 394  *
 395  * When CONFIG_SND_DEBUG is set, this macro evaluates the given condition,
 396  * and call WARN() and returns the value if it's non-zero.
 397  *
 398  * When CONFIG_SND_DEBUG is not set, this just returns zero, and the given
 399  * condition is ignored.
 400  *
 401  * NOTE: the argument won't be evaluated at all when CONFIG_SND_DEBUG=n.
 402  * Thus, don't put any statement that influences on the code behavior,
 403  * such as pre/post increment, to the argument of this macro.
 404  * If you want to evaluate and give a warning, use standard WARN_ON().
 405  */
 406 #define snd_BUG_ON(cond)        WARN((cond), "BUG? (%s)\n", __stringify(cond))
 407
 408 #else /* !CONFIG_SND_DEBUG */
 409
 410 #define snd_printd(fmt, args...)        do { } while (0)
 411 #define snd_BUG()                       do { } while (0)
 412 static inline int __snd_bug_on(int cond)
 413 {
 414         return 0;
 415 }
 416 #define snd_BUG_ON(cond)        __snd_bug_on(0 && (cond))  /* always false */
 417
 418 #endif /* CONFIG_SND_DEBUG */
 419
 420 #ifdef CONFIG_SND_DEBUG_VERBOSE
 421 /**
 422  * snd_printdd - debug printk
 423  * @format: format string
 424  *
 425  * Works like snd_printk() for debugging purposes.
 426  * Ignored when CONFIG_SND_DEBUG_VERBOSE is not set.
 427  */
 428 #define snd_printdd(format, args...) snd_printk(format, ##args)
 429 #else
 430 #define snd_printdd(format, args...) /* nothing */
 431 #endif
 432
 433
 434 #define SNDRV_OSS_VERSION         ((3<<16)|(8<<8)|(1<<4)|(0))   /* 3.8.1a */
 435
 436 /* for easier backward-porting */
 437 #if defined(CONFIG_GAMEPORT) || defined(CONFIG_GAMEPORT_MODULE)
 438 #ifndef gameport_set_dev_parent
 439 #define gameport_set_dev_parent(gp,xdev) ((gp)->dev.parent = (xdev))
 440 #define gameport_set_port_data(gp,r) ((gp)->port_data = (r))
 441 #define gameport_get_port_data(gp) (gp)->port_data
 442 #endif
 443 #endif
 444
 445 /* PCI quirk list helper */
 446 struct snd_pci_quirk {
 447         unsigned short subvendor;       /* PCI subvendor ID */
 448         unsigned short subdevice;       /* PCI subdevice ID */
 449         int value;                      /* value */
 450 #ifdef CONFIG_SND_DEBUG_VERBOSE
 451         const char *name;               /* name of the device (optional) */
 452 #endif
 453 };
 454
 455 #define _SND_PCI_QUIRK_ID(vend,dev) \
 456         .subvendor = (vend), .subdevice = (dev)
 457 #define SND_PCI_QUIRK_ID(vend,dev) {_SND_PCI_QUIRK_ID(vend, dev)}
 458 #ifdef CONFIG_SND_DEBUG_VERBOSE
 459 #define SND_PCI_QUIRK(vend,dev,xname,val) \
 460         {_SND_PCI_QUIRK_ID(vend, dev), .value = (val), .name = (xname)}
 461 #else
 462 #define SND_PCI_QUIRK(vend,dev,xname,val) \
 463         {_SND_PCI_QUIRK_ID(vend, dev), .value = (val)}
 464 #endif
 465
 466 const struct snd_pci_quirk *
 467 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list);
 468
 469
 470 #endif /* __SOUND_CORE_H */