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 snd_power_get_state(struct snd_card * card)153 static inline unsigned int snd_power_get_state(struct snd_card *card) 154 { 155 return READ_ONCE(card->power_state); 156 } 157 snd_power_change_state(struct snd_card * card,unsigned int state)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 */ snd_power_ref(struct snd_card * card)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 */ snd_power_unref(struct snd_card * card)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 */ snd_power_sync_ref(struct snd_card * card)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 snd_power_wait(struct snd_card * card)205 static inline int snd_power_wait(struct snd_card *card) { return 0; } snd_power_ref(struct snd_card * card)206 static inline void snd_power_ref(struct snd_card *card) {} snd_power_unref(struct snd_card * card)207 static inline void snd_power_unref(struct snd_card *card) {} snd_power_ref_and_wait(struct snd_card * card)208 static inline int snd_power_ref_and_wait(struct snd_card *card) { return 0; } snd_power_sync_ref(struct snd_card * card)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 */ snd_card_get_device_link(struct snd_card * card)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 snd_minor_info_oss_init(void)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 */ snd_card_unref(struct snd_card * card)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 * snd_pci_quirk_lookup(struct pci_dev * pci,const struct snd_pci_quirk * list)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 * snd_pci_quirk_lookup_id(u16 vendor,u16 device,const struct snd_pci_quirk * list)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 */ 452