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 list lock */
102 rwlock_t ctl_files_rwlock; /* ctl_files list lock */
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 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 void snd_device_initialize(struct device *dev, 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 int snd_card_disconnect(struct snd_card *card);
290 void snd_card_disconnect_sync(struct snd_card *card);
291 int snd_card_free(struct snd_card *card);
292 int 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 /* sound printk debug levels */
349 enum {
350 SND_PR_ALWAYS,
351 SND_PR_DEBUG,
352 SND_PR_VERBOSE,
353 };
354
355 #if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK)
356 __printf(4, 5)
357 void __snd_printk(unsigned int level, const char *file, int line,
358 const char *format, ...);
359 #else
360 #define __snd_printk(level, file, line, format, ...) \
361 printk(format, ##__VA_ARGS__)
362 #endif
363
364 /**
365 * snd_printk - printk wrapper
366 * @fmt: format string
367 *
368 * Works like printk() but prints the file and the line of the caller
369 * when configured with CONFIG_SND_VERBOSE_PRINTK.
370 */
371 #define snd_printk(fmt, ...) \
372 __snd_printk(0, __FILE__, __LINE__, fmt, ##__VA_ARGS__)
373
374 #ifdef CONFIG_SND_DEBUG
375 /**
376 * snd_printd - debug printk
377 * @fmt: format string
378 *
379 * Works like snd_printk() for debugging purposes.
380 * Ignored when CONFIG_SND_DEBUG is not set.
381 */
382 #define snd_printd(fmt, ...) \
383 __snd_printk(1, __FILE__, __LINE__, fmt, ##__VA_ARGS__)
384 #define _snd_printd(level, fmt, ...) \
385 __snd_printk(level, __FILE__, __LINE__, fmt, ##__VA_ARGS__)
386
387 /**
388 * snd_BUG - give a BUG warning message and stack trace
389 *
390 * Calls WARN() if CONFIG_SND_DEBUG is set.
391 * Ignored when CONFIG_SND_DEBUG is not set.
392 */
393 #define snd_BUG() WARN(1, "BUG?\n")
394
395 /**
396 * snd_printd_ratelimit - Suppress high rates of output when
397 * CONFIG_SND_DEBUG is enabled.
398 */
399 #define snd_printd_ratelimit() printk_ratelimit()
400
401 /**
402 * snd_BUG_ON - debugging check macro
403 * @cond: condition to evaluate
404 *
405 * Has the same behavior as WARN_ON when CONFIG_SND_DEBUG is set,
406 * otherwise just evaluates the conditional and returns the value.
407 */
408 #define snd_BUG_ON(cond) WARN_ON((cond))
409
410 #else /* !CONFIG_SND_DEBUG */
411
412 __printf(1, 2)
snd_printd(const char * format,...)413 static inline void snd_printd(const char *format, ...) {}
414 __printf(2, 3)
_snd_printd(int level,const char * format,...)415 static inline void _snd_printd(int level, const char *format, ...) {}
416
417 #define snd_BUG() do { } while (0)
418
419 #define snd_BUG_ON(condition) ({ \
420 int __ret_warn_on = !!(condition); \
421 unlikely(__ret_warn_on); \
422 })
423
snd_printd_ratelimit(void)424 static inline bool snd_printd_ratelimit(void) { return false; }
425
426 #endif /* CONFIG_SND_DEBUG */
427
428 #ifdef CONFIG_SND_DEBUG_VERBOSE
429 /**
430 * snd_printdd - debug printk
431 * @format: format string
432 *
433 * Works like snd_printk() for debugging purposes.
434 * Ignored when CONFIG_SND_DEBUG_VERBOSE is not set.
435 */
436 #define snd_printdd(format, ...) \
437 __snd_printk(2, __FILE__, __LINE__, format, ##__VA_ARGS__)
438 #else
439 __printf(1, 2)
snd_printdd(const char * format,...)440 static inline void snd_printdd(const char *format, ...) {}
441 #endif
442
443
444 #define SNDRV_OSS_VERSION ((3<<16)|(8<<8)|(1<<4)|(0)) /* 3.8.1a */
445
446 /* for easier backward-porting */
447 #if IS_ENABLED(CONFIG_GAMEPORT)
448 #define gameport_set_dev_parent(gp,xdev) ((gp)->dev.parent = (xdev))
449 #define gameport_set_port_data(gp,r) ((gp)->port_data = (r))
450 #define gameport_get_port_data(gp) (gp)->port_data
451 #endif
452
453 /* PCI quirk list helper */
454 struct snd_pci_quirk {
455 unsigned short subvendor; /* PCI subvendor ID */
456 unsigned short subdevice; /* PCI subdevice ID */
457 unsigned short subdevice_mask; /* bitmask to match */
458 int value; /* value */
459 #ifdef CONFIG_SND_DEBUG_VERBOSE
460 const char *name; /* name of the device (optional) */
461 #endif
462 };
463
464 #define _SND_PCI_QUIRK_ID_MASK(vend, mask, dev) \
465 .subvendor = (vend), .subdevice = (dev), .subdevice_mask = (mask)
466 #define _SND_PCI_QUIRK_ID(vend, dev) \
467 _SND_PCI_QUIRK_ID_MASK(vend, 0xffff, dev)
468 #define SND_PCI_QUIRK_ID(vend,dev) {_SND_PCI_QUIRK_ID(vend, dev)}
469 #ifdef CONFIG_SND_DEBUG_VERBOSE
470 #define SND_PCI_QUIRK(vend,dev,xname,val) \
471 {_SND_PCI_QUIRK_ID(vend, dev), .value = (val), .name = (xname)}
472 #define SND_PCI_QUIRK_VENDOR(vend, xname, val) \
473 {_SND_PCI_QUIRK_ID_MASK(vend, 0, 0), .value = (val), .name = (xname)}
474 #define SND_PCI_QUIRK_MASK(vend, mask, dev, xname, val) \
475 {_SND_PCI_QUIRK_ID_MASK(vend, mask, dev), \
476 .value = (val), .name = (xname)}
477 #define snd_pci_quirk_name(q) ((q)->name)
478 #else
479 #define SND_PCI_QUIRK(vend,dev,xname,val) \
480 {_SND_PCI_QUIRK_ID(vend, dev), .value = (val)}
481 #define SND_PCI_QUIRK_MASK(vend, mask, dev, xname, val) \
482 {_SND_PCI_QUIRK_ID_MASK(vend, mask, dev), .value = (val)}
483 #define SND_PCI_QUIRK_VENDOR(vend, xname, val) \
484 {_SND_PCI_QUIRK_ID_MASK(vend, 0, 0), .value = (val)}
485 #define snd_pci_quirk_name(q) ""
486 #endif
487
488 #ifdef CONFIG_PCI
489 const struct snd_pci_quirk *
490 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list);
491
492 const struct snd_pci_quirk *
493 snd_pci_quirk_lookup_id(u16 vendor, u16 device,
494 const struct snd_pci_quirk *list);
495 #else
496 static inline const struct snd_pci_quirk *
snd_pci_quirk_lookup(struct pci_dev * pci,const struct snd_pci_quirk * list)497 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
498 {
499 return NULL;
500 }
501
502 static inline const struct snd_pci_quirk *
snd_pci_quirk_lookup_id(u16 vendor,u16 device,const struct snd_pci_quirk * list)503 snd_pci_quirk_lookup_id(u16 vendor, u16 device,
504 const struct snd_pci_quirk *list)
505 {
506 return NULL;
507 }
508 #endif
509
510 /* async signal helpers */
511 struct snd_fasync;
512
513 int snd_fasync_helper(int fd, struct file *file, int on,
514 struct snd_fasync **fasyncp);
515 void snd_kill_fasync(struct snd_fasync *fasync, int signal, int poll);
516 void snd_fasync_free(struct snd_fasync *fasync);
517
518 #endif /* __SOUND_CORE_H */
519