xref: /linux/include/sound/core.h (revision 3a39d672e7f48b8d6b91a09afa4b55352773b4b5)
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