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/device.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/stringify.h>
  31 #include <linux/printk.h>
  32
  33 /* number of supported soundcards */
  34 #ifdef CONFIG_SND_DYNAMIC_MINORS
  35 #define SNDRV_CARDS CONFIG_SND_MAX_CARDS
  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 struct pci_dev;
  44 struct module;
  45 struct completion;
  46
  47 /* device allocation stuff */
  48
  49 /* type of the object used in snd_device_*()
  50  * this also defines the calling order
  51  */
  52 enum snd_device_type {
  53         SNDRV_DEV_LOWLEVEL,
  54         SNDRV_DEV_CONTROL,
  55         SNDRV_DEV_INFO,
  56         SNDRV_DEV_BUS,
  57         SNDRV_DEV_CODEC,
  58         SNDRV_DEV_PCM,
  59         SNDRV_DEV_COMPRESS,
  60         SNDRV_DEV_RAWMIDI,
  61         SNDRV_DEV_TIMER,
  62         SNDRV_DEV_SEQUENCER,
  63         SNDRV_DEV_HWDEP,
  64         SNDRV_DEV_JACK,
  65 };
  66
  67 enum snd_device_state {
  68         SNDRV_DEV_BUILD,
  69         SNDRV_DEV_REGISTERED,
  70         SNDRV_DEV_DISCONNECTED,
  71 };
  72
  73 struct snd_device;
  74
  75 struct snd_device_ops {
  76         int (*dev_free)(struct snd_device *dev);
  77         int (*dev_register)(struct snd_device *dev);
  78         int (*dev_disconnect)(struct snd_device *dev);
  79 };
  80
  81 struct snd_device {
  82         struct list_head list;          /* list of registered devices */
  83         struct snd_card *card;          /* card which holds this device */
  84         enum snd_device_state state;    /* state of the device */
  85         enum snd_device_type type;      /* device type */
  86         void *device_data;              /* device structure */
  87         struct snd_device_ops *ops;     /* operations */
  88 };
  89
  90 #define snd_device(n) list_entry(n, struct snd_device, list)
  91
  92 /* main structure for soundcard */
  93
  94 struct snd_card {
  95         int number;                     /* number of soundcard (index to
  96                                                                 snd_cards) */
  97
  98         char id[16];                    /* id string of this card */
  99         char driver[16];                /* driver name */
 100         char shortname[32];             /* short name of this soundcard */
 101         char longname[80];              /* name of this soundcard */
 102         char irq_descr[32];             /* Interrupt description */
 103         char mixername[80];             /* mixer name */
 104         char components[128];           /* card components delimited with
 105                                                                 space */
 106         struct module *module;          /* top-level module */
 107
 108         void *private_data;             /* private data for soundcard */
 109         void (*private_free) (struct snd_card *card); /* callback for freeing of
 110                                                                 private data */
 111         struct list_head devices;       /* devices */
 112
 113         struct device ctl_dev;          /* control device */
 114         unsigned int last_numid;        /* last used numeric ID */
 115         struct rw_semaphore controls_rwsem;     /* controls list lock */
 116         rwlock_t ctl_files_rwlock;      /* ctl_files list lock */
 117         int controls_count;             /* count of all controls */
 118         int user_ctl_count;             /* count of all user controls */
 119         struct list_head controls;      /* all controls for this card */
 120         struct list_head ctl_files;     /* active control files */
 121
 122         struct snd_info_entry *proc_root;       /* root for soundcard specific files */
 123         struct snd_info_entry *proc_id; /* the card id */
 124         struct proc_dir_entry *proc_root_link;  /* number link to real id */
 125
 126         struct list_head files_list;    /* all files associated to this card */
 127         struct snd_shutdown_f_ops *s_f_ops; /* file operations in the shutdown
 128                                                                 state */
 129         spinlock_t files_lock;          /* lock the files for this card */
 130         int shutdown;                   /* this card is going down */
 131         struct completion *release_completion;
 132         struct device *dev;             /* device assigned to this card */
 133         struct device card_dev;         /* cardX object for sysfs */
 134         const struct attribute_group *dev_groups[4]; /* assigned sysfs attr */
 135         bool registered;                /* card_dev is registered? */
 136
 137 #ifdef CONFIG_PM
 138         unsigned int power_state;       /* power state */
 139         wait_queue_head_t power_sleep;
 140 #endif
 141
 142 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
 143         struct snd_mixer_oss *mixer_oss;
 144         int mixer_oss_change_count;
 145 #endif
 146 };
 147
 148 #define dev_to_snd_card(p)      container_of(p, struct snd_card, card_dev)
 149
 150 #ifdef CONFIG_PM
 151 static inline unsigned int snd_power_get_state(struct snd_card *card)
 152 {
 153         return card->power_state;
 154 }
 155
 156 static inline void snd_power_change_state(struct snd_card *card, unsigned int state)
 157 {
 158         card->power_state = state;
 159         wake_up(&card->power_sleep);
 160 }
 161
 162 /* init.c */
 163 int snd_power_wait(struct snd_card *card, unsigned int power_state);
 164
 165 #else /* ! CONFIG_PM */
 166
 167 static inline int snd_power_wait(struct snd_card *card, unsigned int state) { return 0; }
 168 #define snd_power_get_state(card)       ({ (void)(card); SNDRV_CTL_POWER_D0; })
 169 #define snd_power_change_state(card, state)     do { (void)(card); } while (0)
 170
 171 #endif /* CONFIG_PM */
 172
 173 struct snd_minor {
 174         int type;                       /* SNDRV_DEVICE_TYPE_XXX */
 175         int card;                       /* card number */
 176         int device;                     /* device number */
 177         const struct file_operations *f_ops;    /* file operations */
 178         void *private_data;             /* private data for f_ops->open */
 179         struct device *dev;             /* device for sysfs */
 180         struct snd_card *card_ptr;      /* assigned card instance */
 181 };
 182
 183 /* return a device pointer linked to each sound device as a parent */
 184 static inline struct device *snd_card_get_device_link(struct snd_card *card)
 185 {
 186         return card ? &card->card_dev : NULL;
 187 }
 188
 189 /* sound.c */
 190
 191 extern int snd_major;
 192 extern int snd_ecards_limit;
 193 extern struct class *sound_class;
 194
 195 void snd_request_card(int card);
 196
 197 void snd_device_initialize(struct device *dev, struct snd_card *card);
 198
 199 int snd_register_device(int type, struct snd_card *card, int dev,
 200                         const struct file_operations *f_ops,
 201                         void *private_data, struct device *device);
 202 int snd_unregister_device(struct device *dev);
 203 void *snd_lookup_minor_data(unsigned int minor, int type);
 204
 205 #ifdef CONFIG_SND_OSSEMUL
 206 int snd_register_oss_device(int type, struct snd_card *card, int dev,
 207                             const struct file_operations *f_ops, void *private_data);
 208 int snd_unregister_oss_device(int type, struct snd_card *card, int dev);
 209 void *snd_lookup_oss_minor_data(unsigned int minor, int type);
 210 #endif
 211
 212 int snd_minor_info_init(void);
 213
 214 /* sound_oss.c */
 215
 216 #ifdef CONFIG_SND_OSSEMUL
 217 int snd_minor_info_oss_init(void);
 218 #else
 219 static inline int snd_minor_info_oss_init(void) { return 0; }
 220 #endif
 221
 222 /* memory.c */
 223
 224 int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count);
 225 int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count);
 226
 227 /* init.c */
 228
 229 extern struct snd_card *snd_cards[SNDRV_CARDS];
 230 int snd_card_locked(int card);
 231 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
 232 #define SND_MIXER_OSS_NOTIFY_REGISTER   0
 233 #define SND_MIXER_OSS_NOTIFY_DISCONNECT 1
 234 #define SND_MIXER_OSS_NOTIFY_FREE       2
 235 extern int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int cmd);
 236 #endif
 237
 238 int snd_card_new(struct device *parent, int idx, const char *xid,
 239                  struct module *module, int extra_size,
 240                  struct snd_card **card_ret);
 241
 242 int snd_card_disconnect(struct snd_card *card);
 243 int snd_card_free(struct snd_card *card);
 244 int snd_card_free_when_closed(struct snd_card *card);
 245 void snd_card_set_id(struct snd_card *card, const char *id);
 246 int snd_card_register(struct snd_card *card);
 247 int snd_card_info_init(void);
 248 int snd_card_add_dev_attr(struct snd_card *card,
 249                           const struct attribute_group *group);
 250 int snd_component_add(struct snd_card *card, const char *component);
 251 int snd_card_file_add(struct snd_card *card, struct file *file);
 252 int snd_card_file_remove(struct snd_card *card, struct file *file);
 253 #define snd_card_unref(card)    put_device(&(card)->card_dev)
 254
 255 #define snd_card_set_dev(card, devptr) ((card)->dev = (devptr))
 256
 257 /* device.c */
 258
 259 int snd_device_new(struct snd_card *card, enum snd_device_type type,
 260                    void *device_data, struct snd_device_ops *ops);
 261 int snd_device_register(struct snd_card *card, void *device_data);
 262 int snd_device_register_all(struct snd_card *card);
 263 void snd_device_disconnect(struct snd_card *card, void *device_data);
 264 void snd_device_disconnect_all(struct snd_card *card);
 265 void snd_device_free(struct snd_card *card, void *device_data);
 266 void snd_device_free_all(struct snd_card *card);
 267
 268 /* isadma.c */
 269
 270 #ifdef CONFIG_ISA_DMA_API
 271 #define DMA_MODE_NO_ENABLE      0x0100
 272
 273 void snd_dma_program(unsigned long dma, unsigned long addr, unsigned int size, unsigned short mode);
 274 void snd_dma_disable(unsigned long dma);
 275 unsigned int snd_dma_pointer(unsigned long dma, unsigned int size);
 276 #endif
 277
 278 /* misc.c */
 279 struct resource;
 280 void release_and_free_resource(struct resource *res);
 281
 282 /* --- */
 283
 284 /* sound printk debug levels */
 285 enum {
 286         SND_PR_ALWAYS,
 287         SND_PR_DEBUG,
 288         SND_PR_VERBOSE,
 289 };
 290
 291 #if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK)
 292 __printf(4, 5)
 293 void __snd_printk(unsigned int level, const char *file, int line,
 294                   const char *format, ...);
 295 #else
 296 #define __snd_printk(level, file, line, format, ...) \
 297         printk(format, ##__VA_ARGS__)
 298 #endif
 299
 300 /**
 301  * snd_printk - printk wrapper
 302  * @fmt: format string
 303  *
 304  * Works like printk() but prints the file and the line of the caller
 305  * when configured with CONFIG_SND_VERBOSE_PRINTK.
 306  */
 307 #define snd_printk(fmt, ...) \
 308         __snd_printk(0, __FILE__, __LINE__, fmt, ##__VA_ARGS__)
 309
 310 #ifdef CONFIG_SND_DEBUG
 311 /**
 312  * snd_printd - debug printk
 313  * @fmt: format string
 314  *
 315  * Works like snd_printk() for debugging purposes.
 316  * Ignored when CONFIG_SND_DEBUG is not set.
 317  */
 318 #define snd_printd(fmt, ...) \
 319         __snd_printk(1, __FILE__, __LINE__, fmt, ##__VA_ARGS__)
 320 #define _snd_printd(level, fmt, ...) \
 321         __snd_printk(level, __FILE__, __LINE__, fmt, ##__VA_ARGS__)
 322
 323 /**
 324  * snd_BUG - give a BUG warning message and stack trace
 325  *
 326  * Calls WARN() if CONFIG_SND_DEBUG is set.
 327  * Ignored when CONFIG_SND_DEBUG is not set.
 328  */
 329 #define snd_BUG()               WARN(1, "BUG?\n")
 330
 331 /**
 332  * Suppress high rates of output when CONFIG_SND_DEBUG is enabled.
 333  */
 334 #define snd_printd_ratelimit() printk_ratelimit()
 335
 336 /**
 337  * snd_BUG_ON - debugging check macro
 338  * @cond: condition to evaluate
 339  *
 340  * Has the same behavior as WARN_ON when CONFIG_SND_DEBUG is set,
 341  * otherwise just evaluates the conditional and returns the value.
 342  */
 343 #define snd_BUG_ON(cond)        WARN_ON((cond))
 344
 345 #else /* !CONFIG_SND_DEBUG */
 346
 347 __printf(1, 2)
 348 static inline void snd_printd(const char *format, ...) {}
 349 __printf(2, 3)
 350 static inline void _snd_printd(int level, const char *format, ...) {}
 351
 352 #define snd_BUG()                       do { } while (0)
 353
 354 #define snd_BUG_ON(condition) ({ \
 355         int __ret_warn_on = !!(condition); \
 356         unlikely(__ret_warn_on); \
 357 })
 358
 359 static inline bool snd_printd_ratelimit(void) { return false; }
 360
 361 #endif /* CONFIG_SND_DEBUG */
 362
 363 #ifdef CONFIG_SND_DEBUG_VERBOSE
 364 /**
 365  * snd_printdd - debug printk
 366  * @format: format string
 367  *
 368  * Works like snd_printk() for debugging purposes.
 369  * Ignored when CONFIG_SND_DEBUG_VERBOSE is not set.
 370  */
 371 #define snd_printdd(format, ...) \
 372         __snd_printk(2, __FILE__, __LINE__, format, ##__VA_ARGS__)
 373 #else
 374 __printf(1, 2)
 375 static inline void snd_printdd(const char *format, ...) {}
 376 #endif
 377
 378
 379 #define SNDRV_OSS_VERSION         ((3<<16)|(8<<8)|(1<<4)|(0))   /* 3.8.1a */
 380
 381 /* for easier backward-porting */
 382 #if IS_ENABLED(CONFIG_GAMEPORT)
 383 #define gameport_set_dev_parent(gp,xdev) ((gp)->dev.parent = (xdev))
 384 #define gameport_set_port_data(gp,r) ((gp)->port_data = (r))
 385 #define gameport_get_port_data(gp) (gp)->port_data
 386 #endif
 387
 388 /* PCI quirk list helper */
 389 struct snd_pci_quirk {
 390         unsigned short subvendor;       /* PCI subvendor ID */
 391         unsigned short subdevice;       /* PCI subdevice ID */
 392         unsigned short subdevice_mask;  /* bitmask to match */
 393         int value;                      /* value */
 394 #ifdef CONFIG_SND_DEBUG_VERBOSE
 395         const char *name;               /* name of the device (optional) */
 396 #endif
 397 };
 398
 399 #define _SND_PCI_QUIRK_ID_MASK(vend, mask, dev) \
 400         .subvendor = (vend), .subdevice = (dev), .subdevice_mask = (mask)
 401 #define _SND_PCI_QUIRK_ID(vend, dev) \
 402         _SND_PCI_QUIRK_ID_MASK(vend, 0xffff, dev)
 403 #define SND_PCI_QUIRK_ID(vend,dev) {_SND_PCI_QUIRK_ID(vend, dev)}
 404 #ifdef CONFIG_SND_DEBUG_VERBOSE
 405 #define SND_PCI_QUIRK(vend,dev,xname,val) \
 406         {_SND_PCI_QUIRK_ID(vend, dev), .value = (val), .name = (xname)}
 407 #define SND_PCI_QUIRK_VENDOR(vend, xname, val)                  \
 408         {_SND_PCI_QUIRK_ID_MASK(vend, 0, 0), .value = (val), .name = (xname)}
 409 #define SND_PCI_QUIRK_MASK(vend, mask, dev, xname, val)                 \
 410         {_SND_PCI_QUIRK_ID_MASK(vend, mask, dev),                       \
 411                         .value = (val), .name = (xname)}
 412 #define snd_pci_quirk_name(q)   ((q)->name)
 413 #else
 414 #define SND_PCI_QUIRK(vend,dev,xname,val) \
 415         {_SND_PCI_QUIRK_ID(vend, dev), .value = (val)}
 416 #define SND_PCI_QUIRK_MASK(vend, mask, dev, xname, val)                 \
 417         {_SND_PCI_QUIRK_ID_MASK(vend, mask, dev), .value = (val)}
 418 #define SND_PCI_QUIRK_VENDOR(vend, xname, val)                  \
 419         {_SND_PCI_QUIRK_ID_MASK(vend, 0, 0), .value = (val)}
 420 #define snd_pci_quirk_name(q)   ""
 421 #endif
 422
 423 #ifdef CONFIG_PCI
 424 const struct snd_pci_quirk *
 425 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list);
 426
 427 const struct snd_pci_quirk *
 428 snd_pci_quirk_lookup_id(u16 vendor, u16 device,
 429                         const struct snd_pci_quirk *list);
 430 #else
 431 static inline const struct snd_pci_quirk *
 432 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
 433 {
 434         return NULL;
 435 }
 436
 437 static inline const struct snd_pci_quirk *
 438 snd_pci_quirk_lookup_id(u16 vendor, u16 device,
 439                         const struct snd_pci_quirk *list)
 440 {
 441         return NULL;
 442 }
 443 #endif
 444
 445 #endif /* __SOUND_CORE_H */