1 /* SPDX-License-Identifier: GPL-2.0-or-later */
6 * Main header file for the ALSA driver
7 * Copyright (c) 1994-2001 by Jaroslav Kysela <perex@perex.cz>
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>
18 /* number of supported soundcards */
19 #ifdef CONFIG_SND_DYNAMIC_MINORS
20 #define SNDRV_CARDS CONFIG_SND_MAX_CARDS
22 #define SNDRV_CARDS 8 /* don't change - minor numbers */
25 #define CONFIG_SND_MAJOR 116 /* standard configuration */
27 /* forward declarations */
32 /* device allocation stuff */
34 /* type of the object used in snd_device_*()
35 * this also defines the calling order
37 enum snd_device_type {
49 SNDRV_DEV_CONTROL, /* NOTE: this must be the last one */
52 enum snd_device_state {
55 SNDRV_DEV_DISCONNECTED,
60 struct snd_device_ops {
61 int (*dev_free)(struct snd_device *dev);
62 int (*dev_register)(struct snd_device *dev);
63 int (*dev_disconnect)(struct snd_device *dev);
67 struct list_head list; /* list of registered devices */
68 struct snd_card *card; /* card which holds this device */
69 enum snd_device_state state; /* state of the device */
70 enum snd_device_type type; /* device type */
71 void *device_data; /* device structure */
72 const struct snd_device_ops *ops; /* operations */
75 #define snd_device(n) list_entry(n, struct snd_device, list)
77 /* main structure for soundcard */
80 int number; /* number of soundcard (index to
83 char id[16]; /* id string of this card */
84 char driver[16]; /* driver name */
85 char shortname[32]; /* short name of this soundcard */
86 char longname[80]; /* name of this soundcard */
87 char irq_descr[32]; /* Interrupt description */
88 char mixername[80]; /* mixer name */
89 char components[128]; /* card components delimited with
91 struct module *module; /* top-level module */
93 void *private_data; /* private data for soundcard */
94 void (*private_free) (struct snd_card *card); /* callback for freeing of
96 struct list_head devices; /* devices */
98 struct device ctl_dev; /* control device */
99 unsigned int last_numid; /* last used numeric ID */
100 struct rw_semaphore controls_rwsem; /* controls list lock */
101 rwlock_t ctl_files_rwlock; /* ctl_files list lock */
102 int controls_count; /* count of all controls */
103 size_t user_ctl_alloc_size; // current memory allocation by user controls.
104 struct list_head controls; /* all controls for this card */
105 struct list_head ctl_files; /* active control files */
107 struct snd_info_entry *proc_root; /* root for soundcard specific files */
108 struct proc_dir_entry *proc_root_link; /* number link to real id */
110 struct list_head files_list; /* all files associated to this card */
111 struct snd_shutdown_f_ops *s_f_ops; /* file operations in the shutdown
113 spinlock_t files_lock; /* lock the files for this card */
114 int shutdown; /* this card is going down */
115 struct completion *release_completion;
116 struct device *dev; /* device assigned to this card */
117 struct device card_dev; /* cardX object for sysfs */
118 const struct attribute_group *dev_groups[4]; /* assigned sysfs attr */
119 bool registered; /* card_dev is registered? */
120 int sync_irq; /* assigned irq, used for PCM sync */
121 wait_queue_head_t remove_sleep;
123 size_t total_pcm_alloc_bytes; /* total amount of allocated buffers */
124 struct mutex memory_mutex; /* protection for the above */
125 #ifdef CONFIG_SND_DEBUG
126 struct dentry *debugfs_root; /* debugfs root for card */
130 unsigned int power_state; /* power state */
132 wait_queue_head_t power_sleep;
133 wait_queue_head_t power_ref_sleep;
136 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
137 struct snd_mixer_oss *mixer_oss;
138 int mixer_oss_change_count;
142 #define dev_to_snd_card(p) container_of(p, struct snd_card, card_dev)
145 static inline unsigned int snd_power_get_state(struct snd_card *card)
147 return READ_ONCE(card->power_state);
150 static inline void snd_power_change_state(struct snd_card *card, unsigned int state)
152 WRITE_ONCE(card->power_state, state);
153 wake_up(&card->power_sleep);
157 * snd_power_ref - Take the reference count for power control
158 * @card: sound card object
160 * The power_ref reference of the card is used for managing to block
161 * the snd_power_sync_ref() operation. This function increments the reference.
162 * The counterpart snd_power_unref() has to be called appropriately later.
164 static inline void snd_power_ref(struct snd_card *card)
166 atomic_inc(&card->power_ref);
170 * snd_power_unref - Release the reference count for power control
171 * @card: sound card object
173 static inline void snd_power_unref(struct snd_card *card)
175 if (atomic_dec_and_test(&card->power_ref))
176 wake_up(&card->power_ref_sleep);
180 * snd_power_sync_ref - wait until the card power_ref is freed
181 * @card: sound card object
183 * This function is used to synchronize with the pending power_ref being
186 static inline void snd_power_sync_ref(struct snd_card *card)
188 wait_event(card->power_ref_sleep, !atomic_read(&card->power_ref));
192 int snd_power_wait(struct snd_card *card);
193 int snd_power_ref_and_wait(struct snd_card *card);
195 #else /* ! CONFIG_PM */
197 static inline int snd_power_wait(struct snd_card *card) { return 0; }
198 static inline void snd_power_ref(struct snd_card *card) {}
199 static inline void snd_power_unref(struct snd_card *card) {}
200 static inline int snd_power_ref_and_wait(struct snd_card *card) { return 0; }
201 static inline void snd_power_sync_ref(struct snd_card *card) {}
202 #define snd_power_get_state(card) ({ (void)(card); SNDRV_CTL_POWER_D0; })
203 #define snd_power_change_state(card, state) do { (void)(card); } while (0)
205 #endif /* CONFIG_PM */
208 int type; /* SNDRV_DEVICE_TYPE_XXX */
209 int card; /* card number */
210 int device; /* device number */
211 const struct file_operations *f_ops; /* file operations */
212 void *private_data; /* private data for f_ops->open */
213 struct device *dev; /* device for sysfs */
214 struct snd_card *card_ptr; /* assigned card instance */
217 /* return a device pointer linked to each sound device as a parent */
218 static inline struct device *snd_card_get_device_link(struct snd_card *card)
220 return card ? &card->card_dev : NULL;
225 extern int snd_major;
226 extern int snd_ecards_limit;
227 extern struct class *sound_class;
228 #ifdef CONFIG_SND_DEBUG
229 extern struct dentry *sound_debugfs_root;
232 void snd_request_card(int card);
234 void snd_device_initialize(struct device *dev, struct snd_card *card);
236 int snd_register_device(int type, struct snd_card *card, int dev,
237 const struct file_operations *f_ops,
238 void *private_data, struct device *device);
239 int snd_unregister_device(struct device *dev);
240 void *snd_lookup_minor_data(unsigned int minor, int type);
242 #ifdef CONFIG_SND_OSSEMUL
243 int snd_register_oss_device(int type, struct snd_card *card, int dev,
244 const struct file_operations *f_ops, void *private_data);
245 int snd_unregister_oss_device(int type, struct snd_card *card, int dev);
246 void *snd_lookup_oss_minor_data(unsigned int minor, int type);
249 int snd_minor_info_init(void);
253 #ifdef CONFIG_SND_OSSEMUL
254 int snd_minor_info_oss_init(void);
256 static inline int snd_minor_info_oss_init(void) { return 0; }
261 int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count);
262 int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count);
266 int snd_card_locked(int card);
267 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
268 #define SND_MIXER_OSS_NOTIFY_REGISTER 0
269 #define SND_MIXER_OSS_NOTIFY_DISCONNECT 1
270 #define SND_MIXER_OSS_NOTIFY_FREE 2
271 extern int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int cmd);
274 int snd_card_new(struct device *parent, int idx, const char *xid,
275 struct module *module, int extra_size,
276 struct snd_card **card_ret);
278 int snd_card_disconnect(struct snd_card *card);
279 void snd_card_disconnect_sync(struct snd_card *card);
280 int snd_card_free(struct snd_card *card);
281 int snd_card_free_when_closed(struct snd_card *card);
282 void snd_card_set_id(struct snd_card *card, const char *id);
283 int snd_card_register(struct snd_card *card);
284 int snd_card_info_init(void);
285 int snd_card_add_dev_attr(struct snd_card *card,
286 const struct attribute_group *group);
287 int snd_component_add(struct snd_card *card, const char *component);
288 int snd_card_file_add(struct snd_card *card, struct file *file);
289 int snd_card_file_remove(struct snd_card *card, struct file *file);
291 struct snd_card *snd_card_ref(int card);
294 * snd_card_unref - Unreference the card object
295 * @card: the card object to unreference
297 * Call this function for the card object that was obtained via snd_card_ref()
298 * or snd_lookup_minor_data().
300 static inline void snd_card_unref(struct snd_card *card)
302 put_device(&card->card_dev);
305 #define snd_card_set_dev(card, devptr) ((card)->dev = (devptr))
309 int snd_device_new(struct snd_card *card, enum snd_device_type type,
310 void *device_data, const struct snd_device_ops *ops);
311 int snd_device_register(struct snd_card *card, void *device_data);
312 int snd_device_register_all(struct snd_card *card);
313 void snd_device_disconnect(struct snd_card *card, void *device_data);
314 void snd_device_disconnect_all(struct snd_card *card);
315 void snd_device_free(struct snd_card *card, void *device_data);
316 void snd_device_free_all(struct snd_card *card);
317 int snd_device_get_state(struct snd_card *card, void *device_data);
321 #ifdef CONFIG_ISA_DMA_API
322 #define DMA_MODE_NO_ENABLE 0x0100
324 void snd_dma_program(unsigned long dma, unsigned long addr, unsigned int size, unsigned short mode);
325 void snd_dma_disable(unsigned long dma);
326 unsigned int snd_dma_pointer(unsigned long dma, unsigned int size);
331 void release_and_free_resource(struct resource *res);
335 /* sound printk debug levels */
342 #if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK)
344 void __snd_printk(unsigned int level, const char *file, int line,
345 const char *format, ...);
347 #define __snd_printk(level, file, line, format, ...) \
348 printk(format, ##__VA_ARGS__)
352 * snd_printk - printk wrapper
353 * @fmt: format string
355 * Works like printk() but prints the file and the line of the caller
356 * when configured with CONFIG_SND_VERBOSE_PRINTK.
358 #define snd_printk(fmt, ...) \
359 __snd_printk(0, __FILE__, __LINE__, fmt, ##__VA_ARGS__)
361 #ifdef CONFIG_SND_DEBUG
363 * snd_printd - debug printk
364 * @fmt: format string
366 * Works like snd_printk() for debugging purposes.
367 * Ignored when CONFIG_SND_DEBUG is not set.
369 #define snd_printd(fmt, ...) \
370 __snd_printk(1, __FILE__, __LINE__, fmt, ##__VA_ARGS__)
371 #define _snd_printd(level, fmt, ...) \
372 __snd_printk(level, __FILE__, __LINE__, fmt, ##__VA_ARGS__)
375 * snd_BUG - give a BUG warning message and stack trace
377 * Calls WARN() if CONFIG_SND_DEBUG is set.
378 * Ignored when CONFIG_SND_DEBUG is not set.
380 #define snd_BUG() WARN(1, "BUG?\n")
383 * snd_printd_ratelimit - Suppress high rates of output when
384 * CONFIG_SND_DEBUG is enabled.
386 #define snd_printd_ratelimit() printk_ratelimit()
389 * snd_BUG_ON - debugging check macro
390 * @cond: condition to evaluate
392 * Has the same behavior as WARN_ON when CONFIG_SND_DEBUG is set,
393 * otherwise just evaluates the conditional and returns the value.
395 #define snd_BUG_ON(cond) WARN_ON((cond))
397 #else /* !CONFIG_SND_DEBUG */
400 static inline void snd_printd(const char *format, ...) {}
402 static inline void _snd_printd(int level, const char *format, ...) {}
404 #define snd_BUG() do { } while (0)
406 #define snd_BUG_ON(condition) ({ \
407 int __ret_warn_on = !!(condition); \
408 unlikely(__ret_warn_on); \
411 static inline bool snd_printd_ratelimit(void) { return false; }
413 #endif /* CONFIG_SND_DEBUG */
415 #ifdef CONFIG_SND_DEBUG_VERBOSE
417 * snd_printdd - debug printk
418 * @format: format string
420 * Works like snd_printk() for debugging purposes.
421 * Ignored when CONFIG_SND_DEBUG_VERBOSE is not set.
423 #define snd_printdd(format, ...) \
424 __snd_printk(2, __FILE__, __LINE__, format, ##__VA_ARGS__)
427 static inline void snd_printdd(const char *format, ...) {}
431 #define SNDRV_OSS_VERSION ((3<<16)|(8<<8)|(1<<4)|(0)) /* 3.8.1a */
433 /* for easier backward-porting */
434 #if IS_ENABLED(CONFIG_GAMEPORT)
435 #define gameport_set_dev_parent(gp,xdev) ((gp)->dev.parent = (xdev))
436 #define gameport_set_port_data(gp,r) ((gp)->port_data = (r))
437 #define gameport_get_port_data(gp) (gp)->port_data
440 /* PCI quirk list helper */
441 struct snd_pci_quirk {
442 unsigned short subvendor; /* PCI subvendor ID */
443 unsigned short subdevice; /* PCI subdevice ID */
444 unsigned short subdevice_mask; /* bitmask to match */
445 int value; /* value */
446 #ifdef CONFIG_SND_DEBUG_VERBOSE
447 const char *name; /* name of the device (optional) */
451 #define _SND_PCI_QUIRK_ID_MASK(vend, mask, dev) \
452 .subvendor = (vend), .subdevice = (dev), .subdevice_mask = (mask)
453 #define _SND_PCI_QUIRK_ID(vend, dev) \
454 _SND_PCI_QUIRK_ID_MASK(vend, 0xffff, dev)
455 #define SND_PCI_QUIRK_ID(vend,dev) {_SND_PCI_QUIRK_ID(vend, dev)}
456 #ifdef CONFIG_SND_DEBUG_VERBOSE
457 #define SND_PCI_QUIRK(vend,dev,xname,val) \
458 {_SND_PCI_QUIRK_ID(vend, dev), .value = (val), .name = (xname)}
459 #define SND_PCI_QUIRK_VENDOR(vend, xname, val) \
460 {_SND_PCI_QUIRK_ID_MASK(vend, 0, 0), .value = (val), .name = (xname)}
461 #define SND_PCI_QUIRK_MASK(vend, mask, dev, xname, val) \
462 {_SND_PCI_QUIRK_ID_MASK(vend, mask, dev), \
463 .value = (val), .name = (xname)}
464 #define snd_pci_quirk_name(q) ((q)->name)
466 #define SND_PCI_QUIRK(vend,dev,xname,val) \
467 {_SND_PCI_QUIRK_ID(vend, dev), .value = (val)}
468 #define SND_PCI_QUIRK_MASK(vend, mask, dev, xname, val) \
469 {_SND_PCI_QUIRK_ID_MASK(vend, mask, dev), .value = (val)}
470 #define SND_PCI_QUIRK_VENDOR(vend, xname, val) \
471 {_SND_PCI_QUIRK_ID_MASK(vend, 0, 0), .value = (val)}
472 #define snd_pci_quirk_name(q) ""
476 const struct snd_pci_quirk *
477 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list);
479 const struct snd_pci_quirk *
480 snd_pci_quirk_lookup_id(u16 vendor, u16 device,
481 const struct snd_pci_quirk *list);
483 static inline const struct snd_pci_quirk *
484 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
489 static inline const struct snd_pci_quirk *
490 snd_pci_quirk_lookup_id(u16 vendor, u16 device,
491 const struct snd_pci_quirk *list)
497 #endif /* __SOUND_CORE_H */