include/sound/core.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef __SOUND_CORE_H
   3 #define __SOUND_CORE_H
   4
   5 /*
   6  *  Main header file for the ALSA driver
   7  *  Copyright (c) 1994-2001 by Jaroslav Kysela <perex@perex.cz>
   8  */
   9
  10 #include <linux/device.h>
  11 #include <linux/sched.h>                /* wake_up() */
  12 #include <linux/mutex.h>                /* struct mutex */
  13 #include <linux/rwsem.h>                /* struct rw_semaphore */
  14 #include <linux/pm.h>                   /* pm_message_t */
  15 #include <linux/stringify.h>
  16 #include <linux/printk.h>
  17 #include <linux/xarray.h>
  18
  19 /* number of supported soundcards */
  20 #ifdef CONFIG_SND_DYNAMIC_MINORS
  21 #define SNDRV_CARDS CONFIG_SND_MAX_CARDS
  22 #else
  23 #define SNDRV_CARDS 8           /* don't change - minor numbers */
  24 #endif
  25
  26 #define CONFIG_SND_MAJOR        116     /* standard configuration */
  27
  28 /* forward declarations */
  29 struct pci_dev;
  30 struct module;
  31 struct completion;
  32
  33 /* device allocation stuff */
  34
  35 /* type of the object used in snd_device_*()
  36  * this also defines the calling order
  37  */
  38 enum snd_device_type {
  39         SNDRV_DEV_LOWLEVEL,
  40         SNDRV_DEV_INFO,
  41         SNDRV_DEV_BUS,
  42         SNDRV_DEV_CODEC,
  43         SNDRV_DEV_PCM,
  44         SNDRV_DEV_COMPRESS,
  45         SNDRV_DEV_RAWMIDI,
  46         SNDRV_DEV_TIMER,
  47         SNDRV_DEV_SEQUENCER,
  48         SNDRV_DEV_HWDEP,
  49         SNDRV_DEV_JACK,
  50         SNDRV_DEV_CONTROL,      /* NOTE: this must be the last one */
  51 };
  52
  53 enum snd_device_state {
  54         SNDRV_DEV_BUILD,
  55         SNDRV_DEV_REGISTERED,
  56         SNDRV_DEV_DISCONNECTED,
  57 };
  58
  59 struct snd_device;
  60
  61 struct snd_device_ops {
  62         int (*dev_free)(struct snd_device *dev);
  63         int (*dev_register)(struct snd_device *dev);
  64         int (*dev_disconnect)(struct snd_device *dev);
  65 };
  66
  67 struct snd_device {
  68         struct list_head list;          /* list of registered devices */
  69         struct snd_card *card;          /* card which holds this device */
  70         enum snd_device_state state;    /* state of the device */
  71         enum snd_device_type type;      /* device type */
  72         void *device_data;              /* device structure */
  73         const struct snd_device_ops *ops;       /* operations */
  74 };
  75
  76 #define snd_device(n) list_entry(n, struct snd_device, list)
  77
  78 /* main structure for soundcard */
  79
  80 struct snd_card {
  81         int number;                     /* number of soundcard (index to
  82                                                                 snd_cards) */
  83
  84         char id[16];                    /* id string of this card */
  85         char driver[16];                /* driver name */
  86         char shortname[32];             /* short name of this soundcard */
  87         char longname[80];              /* name of this soundcard */
  88         char irq_descr[32];             /* Interrupt description */
  89         char mixername[80];             /* mixer name */
  90         char components[128];           /* card components delimited with
  91                                                                 space */
  92         struct module *module;          /* top-level module */
  93
  94         void *private_data;             /* private data for soundcard */
  95         void (*private_free) (struct snd_card *card); /* callback for freeing of
  96                                                                 private data */
  97         struct list_head devices;       /* devices */
  98
  99         struct device *ctl_dev;         /* control device */
 100         unsigned int last_numid;        /* last used numeric ID */
 101         struct rw_semaphore controls_rwsem;     /* controls lock (list and values) */
 102         rwlock_t controls_rwlock;       /* lock for lookup and ctl_files list */
 103         int controls_count;             /* count of all controls */
 104         size_t user_ctl_alloc_size;     // current memory allocation by user controls.
 105         struct list_head controls;      /* all controls for this card */
 106         struct list_head ctl_files;     /* active control files */
 107 #ifdef CONFIG_SND_CTL_FAST_LOOKUP
 108         struct xarray ctl_numids;       /* hash table for numids */
 109         struct xarray ctl_hash;         /* hash table for ctl id matching */
 110         bool ctl_hash_collision;        /* ctl_hash collision seen? */
 111 #endif
 112
 113         struct snd_info_entry *proc_root;       /* root for soundcard specific files */
 114         struct proc_dir_entry *proc_root_link;  /* number link to real id */
 115
 116         struct list_head files_list;    /* all files associated to this card */
 117         struct snd_shutdown_f_ops *s_f_ops; /* file operations in the shutdown
 118                                                                 state */
 119         spinlock_t files_lock;          /* lock the files for this card */
 120         int shutdown;                   /* this card is going down */
 121         struct completion *release_completion;
 122         struct device *dev;             /* device assigned to this card */
 123         struct device card_dev;         /* cardX object for sysfs */
 124         const struct attribute_group *dev_groups[4]; /* assigned sysfs attr */
 125         bool registered;                /* card_dev is registered? */
 126         bool managed;                   /* managed via devres */
 127         bool releasing;                 /* during card free process */
 128         int sync_irq;                   /* assigned irq, used for PCM sync */
 129         wait_queue_head_t remove_sleep;
 130
 131         size_t total_pcm_alloc_bytes;   /* total amount of allocated buffers */
 132         struct mutex memory_mutex;      /* protection for the above */
 133 #ifdef CONFIG_SND_DEBUG
 134         struct dentry *debugfs_root;    /* debugfs root for card */
 135 #endif
 136
 137 #ifdef CONFIG_PM
 138         unsigned int power_state;       /* power state */
 139         atomic_t power_ref;
 140         wait_queue_head_t power_sleep;
 141         wait_queue_head_t power_ref_sleep;
 142 #endif
 143
 144 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
 145         struct snd_mixer_oss *mixer_oss;
 146         int mixer_oss_change_count;
 147 #endif
 148 };
 149
 150 #define dev_to_snd_card(p)      container_of(p, struct snd_card, card_dev)
 151
 152 #ifdef CONFIG_PM
 153 static inline unsigned int snd_power_get_state(struct snd_card *card)
 154 {
 155         return READ_ONCE(card->power_state);
 156 }
 157
 158 static inline void snd_power_change_state(struct snd_card *card, unsigned int state)
 159 {
 160         WRITE_ONCE(card->power_state, state);
 161         wake_up(&card->power_sleep);
 162 }
 163
 164 /**
 165  * snd_power_ref - Take the reference count for power control
 166  * @card: sound card object
 167  *
 168  * The power_ref reference of the card is used for managing to block
 169  * the snd_power_sync_ref() operation.  This function increments the reference.
 170  * The counterpart snd_power_unref() has to be called appropriately later.
 171  */
 172 static inline void snd_power_ref(struct snd_card *card)
 173 {
 174         atomic_inc(&card->power_ref);
 175 }
 176
 177 /**
 178  * snd_power_unref - Release the reference count for power control
 179  * @card: sound card object
 180  */
 181 static inline void snd_power_unref(struct snd_card *card)
 182 {
 183         if (atomic_dec_and_test(&card->power_ref))
 184                 wake_up(&card->power_ref_sleep);
 185 }
 186
 187 /**
 188  * snd_power_sync_ref - wait until the card power_ref is freed
 189  * @card: sound card object
 190  *
 191  * This function is used to synchronize with the pending power_ref being
 192  * released.
 193  */
 194 static inline void snd_power_sync_ref(struct snd_card *card)
 195 {
 196         wait_event(card->power_ref_sleep, !atomic_read(&card->power_ref));
 197 }
 198
 199 /* init.c */
 200 int snd_power_wait(struct snd_card *card);
 201 int snd_power_ref_and_wait(struct snd_card *card);
 202
 203 #else /* ! CONFIG_PM */
 204
 205 static inline int snd_power_wait(struct snd_card *card) { return 0; }
 206 static inline void snd_power_ref(struct snd_card *card) {}
 207 static inline void snd_power_unref(struct snd_card *card) {}
 208 static inline int snd_power_ref_and_wait(struct snd_card *card) { return 0; }
 209 static inline void snd_power_sync_ref(struct snd_card *card) {}
 210 #define snd_power_get_state(card)       ({ (void)(card); SNDRV_CTL_POWER_D0; })
 211 #define snd_power_change_state(card, state)     do { (void)(card); } while (0)
 212
 213 #endif /* CONFIG_PM */
 214
 215 struct snd_minor {
 216         int type;                       /* SNDRV_DEVICE_TYPE_XXX */
 217         int card;                       /* card number */
 218         int device;                     /* device number */
 219         const struct file_operations *f_ops;    /* file operations */
 220         void *private_data;             /* private data for f_ops->open */
 221         struct device *dev;             /* device for sysfs */
 222         struct snd_card *card_ptr;      /* assigned card instance */
 223 };
 224
 225 /* return a device pointer linked to each sound device as a parent */
 226 static inline struct device *snd_card_get_device_link(struct snd_card *card)
 227 {
 228         return card ? &card->card_dev : NULL;
 229 }
 230
 231 /* sound.c */
 232
 233 extern int snd_major;
 234 extern int snd_ecards_limit;
 235 extern const struct class sound_class;
 236 #ifdef CONFIG_SND_DEBUG
 237 extern struct dentry *sound_debugfs_root;
 238 #endif
 239
 240 void snd_request_card(int card);
 241
 242 int snd_device_alloc(struct device **dev_p, struct snd_card *card);
 243
 244 int snd_register_device(int type, struct snd_card *card, int dev,
 245                         const struct file_operations *f_ops,
 246                         void *private_data, struct device *device);
 247 int snd_unregister_device(struct device *dev);
 248 void *snd_lookup_minor_data(unsigned int minor, int type);
 249
 250 #ifdef CONFIG_SND_OSSEMUL
 251 int snd_register_oss_device(int type, struct snd_card *card, int dev,
 252                             const struct file_operations *f_ops, void *private_data);
 253 int snd_unregister_oss_device(int type, struct snd_card *card, int dev);
 254 void *snd_lookup_oss_minor_data(unsigned int minor, int type);
 255 #endif
 256
 257 int snd_minor_info_init(void);
 258
 259 /* sound_oss.c */
 260
 261 #ifdef CONFIG_SND_OSSEMUL
 262 int snd_minor_info_oss_init(void);
 263 #else
 264 static inline int snd_minor_info_oss_init(void) { return 0; }
 265 #endif
 266
 267 /* memory.c */
 268
 269 int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count);
 270 int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count);
 271
 272 /* init.c */
 273
 274 int snd_card_locked(int card);
 275 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
 276 #define SND_MIXER_OSS_NOTIFY_REGISTER   0
 277 #define SND_MIXER_OSS_NOTIFY_DISCONNECT 1
 278 #define SND_MIXER_OSS_NOTIFY_FREE       2
 279 extern int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int cmd);
 280 #endif
 281
 282 int snd_card_new(struct device *parent, int idx, const char *xid,
 283                  struct module *module, int extra_size,
 284                  struct snd_card **card_ret);
 285 int snd_devm_card_new(struct device *parent, int idx, const char *xid,
 286                       struct module *module, size_t extra_size,
 287                       struct snd_card **card_ret);
 288
 289 void snd_card_disconnect(struct snd_card *card);
 290 void snd_card_disconnect_sync(struct snd_card *card);
 291 void snd_card_free(struct snd_card *card);
 292 void snd_card_free_when_closed(struct snd_card *card);
 293 int snd_card_free_on_error(struct device *dev, int ret);
 294 void snd_card_set_id(struct snd_card *card, const char *id);
 295 int snd_card_register(struct snd_card *card);
 296 int snd_card_info_init(void);
 297 int snd_card_add_dev_attr(struct snd_card *card,
 298                           const struct attribute_group *group);
 299 int snd_component_add(struct snd_card *card, const char *component);
 300 int snd_card_file_add(struct snd_card *card, struct file *file);
 301 int snd_card_file_remove(struct snd_card *card, struct file *file);
 302
 303 struct snd_card *snd_card_ref(int card);
 304
 305 /**
 306  * snd_card_unref - Unreference the card object
 307  * @card: the card object to unreference
 308  *
 309  * Call this function for the card object that was obtained via snd_card_ref()
 310  * or snd_lookup_minor_data().
 311  */
 312 static inline void snd_card_unref(struct snd_card *card)
 313 {
 314         put_device(&card->card_dev);
 315 }
 316
 317 #define snd_card_set_dev(card, devptr) ((card)->dev = (devptr))
 318
 319 /* device.c */
 320
 321 int snd_device_new(struct snd_card *card, enum snd_device_type type,
 322                    void *device_data, const struct snd_device_ops *ops);
 323 int snd_device_register(struct snd_card *card, void *device_data);
 324 int snd_device_register_all(struct snd_card *card);
 325 void snd_device_disconnect(struct snd_card *card, void *device_data);
 326 void snd_device_disconnect_all(struct snd_card *card);
 327 void snd_device_free(struct snd_card *card, void *device_data);
 328 void snd_device_free_all(struct snd_card *card);
 329 int snd_device_get_state(struct snd_card *card, void *device_data);
 330
 331 /* isadma.c */
 332
 333 #ifdef CONFIG_ISA_DMA_API
 334 #define DMA_MODE_NO_ENABLE      0x0100
 335
 336 void snd_dma_program(unsigned long dma, unsigned long addr, unsigned int size, unsigned short mode);
 337 void snd_dma_disable(unsigned long dma);
 338 unsigned int snd_dma_pointer(unsigned long dma, unsigned int size);
 339 int snd_devm_request_dma(struct device *dev, int dma, const char *name);
 340 #endif
 341
 342 /* misc.c */
 343 struct resource;
 344 void release_and_free_resource(struct resource *res);
 345
 346 /* --- */
 347
 348 #ifdef CONFIG_SND_DEBUG
 349 /**
 350  * snd_BUG - give a BUG warning message and stack trace
 351  *
 352  * Calls WARN() if CONFIG_SND_DEBUG is set.
 353  * Ignored when CONFIG_SND_DEBUG is not set.
 354  */
 355 #define snd_BUG()               WARN(1, "BUG?\n")
 356
 357 /**
 358  * snd_BUG_ON - debugging check macro
 359  * @cond: condition to evaluate
 360  *
 361  * Has the same behavior as WARN_ON when CONFIG_SND_DEBUG is set,
 362  * otherwise just evaluates the conditional and returns the value.
 363  */
 364 #define snd_BUG_ON(cond)        WARN_ON((cond))
 365
 366 #else /* !CONFIG_SND_DEBUG */
 367
 368 #define snd_BUG()                       do { } while (0)
 369
 370 #define snd_BUG_ON(condition) ({ \
 371         int __ret_warn_on = !!(condition); \
 372         unlikely(__ret_warn_on); \
 373 })
 374
 375 #endif /* CONFIG_SND_DEBUG */
 376
 377 #define SNDRV_OSS_VERSION         ((3<<16)|(8<<8)|(1<<4)|(0))   /* 3.8.1a */
 378
 379 /* for easier backward-porting */
 380 #if IS_ENABLED(CONFIG_GAMEPORT)
 381 #define gameport_set_dev_parent(gp,xdev) ((gp)->dev.parent = (xdev))
 382 #define gameport_set_port_data(gp,r) ((gp)->port_data = (r))
 383 #define gameport_get_port_data(gp) (gp)->port_data
 384 #endif
 385
 386 /* PCI quirk list helper */
 387 struct snd_pci_quirk {
 388         unsigned short subvendor;       /* PCI subvendor ID */
 389         unsigned short subdevice;       /* PCI subdevice ID */
 390         unsigned short subdevice_mask;  /* bitmask to match */
 391         int value;                      /* value */
 392 #ifdef CONFIG_SND_DEBUG_VERBOSE
 393         const char *name;               /* name of the device (optional) */
 394 #endif
 395 };
 396
 397 #define _SND_PCI_QUIRK_ID_MASK(vend, mask, dev) \
 398         .subvendor = (vend), .subdevice = (dev), .subdevice_mask = (mask)
 399 #define _SND_PCI_QUIRK_ID(vend, dev) \
 400         _SND_PCI_QUIRK_ID_MASK(vend, 0xffff, dev)
 401 #define SND_PCI_QUIRK_ID(vend,dev) {_SND_PCI_QUIRK_ID(vend, dev)}
 402 #ifdef CONFIG_SND_DEBUG_VERBOSE
 403 #define SND_PCI_QUIRK(vend,dev,xname,val) \
 404         {_SND_PCI_QUIRK_ID(vend, dev), .value = (val), .name = (xname)}
 405 #define SND_PCI_QUIRK_VENDOR(vend, xname, val)                  \
 406         {_SND_PCI_QUIRK_ID_MASK(vend, 0, 0), .value = (val), .name = (xname)}
 407 #define SND_PCI_QUIRK_MASK(vend, mask, dev, xname, val)                 \
 408         {_SND_PCI_QUIRK_ID_MASK(vend, mask, dev),                       \
 409                         .value = (val), .name = (xname)}
 410 #define snd_pci_quirk_name(q)   ((q)->name)
 411 #else
 412 #define SND_PCI_QUIRK(vend,dev,xname,val) \
 413         {_SND_PCI_QUIRK_ID(vend, dev), .value = (val)}
 414 #define SND_PCI_QUIRK_MASK(vend, mask, dev, xname, val)                 \
 415         {_SND_PCI_QUIRK_ID_MASK(vend, mask, dev), .value = (val)}
 416 #define SND_PCI_QUIRK_VENDOR(vend, xname, val)                  \
 417         {_SND_PCI_QUIRK_ID_MASK(vend, 0, 0), .value = (val)}
 418 #define snd_pci_quirk_name(q)   ""
 419 #endif
 420
 421 #ifdef CONFIG_PCI
 422 const struct snd_pci_quirk *
 423 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list);
 424
 425 const struct snd_pci_quirk *
 426 snd_pci_quirk_lookup_id(u16 vendor, u16 device,
 427                         const struct snd_pci_quirk *list);
 428 #else
 429 static inline const struct snd_pci_quirk *
 430 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
 431 {
 432         return NULL;
 433 }
 434
 435 static inline const struct snd_pci_quirk *
 436 snd_pci_quirk_lookup_id(u16 vendor, u16 device,
 437                         const struct snd_pci_quirk *list)
 438 {
 439         return NULL;
 440 }
 441 #endif
 442
 443 /* async signal helpers */
 444 struct snd_fasync;
 445
 446 int snd_fasync_helper(int fd, struct file *file, int on,
 447                       struct snd_fasync **fasyncp);
 448 void snd_kill_fasync(struct snd_fasync *fasync, int signal, int poll);
 449 void snd_fasync_free(struct snd_fasync *fasync);
 450
 451 #endif /* __SOUND_CORE_H */