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Diffstat (limited to 'include/sound/core.h')
| -rw-r--r-- | include/sound/core.h | 518 |
1 files changed, 518 insertions, 0 deletions
diff --git a/include/sound/core.h b/include/sound/core.h new file mode 100644 index 000000000..4365c35d0 --- /dev/null +++ b/include/sound/core.h @@ -0,0 +1,518 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef __SOUND_CORE_H +#define __SOUND_CORE_H + +/* + * Main header file for the ALSA driver + * Copyright (c) 1994-2001 by Jaroslav Kysela <perex@perex.cz> + */ + +#include <linux/device.h> +#include <linux/sched.h> /* wake_up() */ +#include <linux/mutex.h> /* struct mutex */ +#include <linux/rwsem.h> /* struct rw_semaphore */ +#include <linux/pm.h> /* pm_message_t */ +#include <linux/stringify.h> +#include <linux/printk.h> +#include <linux/xarray.h> + +/* number of supported soundcards */ +#ifdef CONFIG_SND_DYNAMIC_MINORS +#define SNDRV_CARDS CONFIG_SND_MAX_CARDS +#else +#define SNDRV_CARDS 8 /* don't change - minor numbers */ +#endif + +#define CONFIG_SND_MAJOR 116 /* standard configuration */ + +/* forward declarations */ +struct pci_dev; +struct module; +struct completion; + +/* device allocation stuff */ + +/* type of the object used in snd_device_*() + * this also defines the calling order + */ +enum snd_device_type { + SNDRV_DEV_LOWLEVEL, + SNDRV_DEV_INFO, + SNDRV_DEV_BUS, + SNDRV_DEV_CODEC, + SNDRV_DEV_PCM, + SNDRV_DEV_COMPRESS, + SNDRV_DEV_RAWMIDI, + SNDRV_DEV_TIMER, + SNDRV_DEV_SEQUENCER, + SNDRV_DEV_HWDEP, + SNDRV_DEV_JACK, + SNDRV_DEV_CONTROL, /* NOTE: this must be the last one */ +}; + +enum snd_device_state { + SNDRV_DEV_BUILD, + SNDRV_DEV_REGISTERED, + SNDRV_DEV_DISCONNECTED, +}; + +struct snd_device; + +struct snd_device_ops { + int (*dev_free)(struct snd_device *dev); + int (*dev_register)(struct snd_device *dev); + int (*dev_disconnect)(struct snd_device *dev); +}; + +struct snd_device { + struct list_head list; /* list of registered devices */ + struct snd_card *card; /* card which holds this device */ + enum snd_device_state state; /* state of the device */ + enum snd_device_type type; /* device type */ + void *device_data; /* device structure */ + const struct snd_device_ops *ops; /* operations */ +}; + +#define snd_device(n) list_entry(n, struct snd_device, list) + +/* main structure for soundcard */ + +struct snd_card { + int number; /* number of soundcard (index to + snd_cards) */ + + char id[16]; /* id string of this card */ + char driver[16]; /* driver name */ + char shortname[32]; /* short name of this soundcard */ + char longname[80]; /* name of this soundcard */ + char irq_descr[32]; /* Interrupt description */ + char mixername[80]; /* mixer name */ + char components[128]; /* card components delimited with + space */ + struct module *module; /* top-level module */ + + void *private_data; /* private data for soundcard */ + void (*private_free) (struct snd_card *card); /* callback for freeing of + private data */ + struct list_head devices; /* devices */ + + struct device ctl_dev; /* control device */ + unsigned int last_numid; /* last used numeric ID */ + struct rw_semaphore controls_rwsem; /* controls list lock */ + rwlock_t ctl_files_rwlock; /* ctl_files list lock */ + int controls_count; /* count of all controls */ + size_t user_ctl_alloc_size; // current memory allocation by user controls. + struct list_head controls; /* all controls for this card */ + struct list_head ctl_files; /* active control files */ +#ifdef CONFIG_SND_CTL_FAST_LOOKUP + struct xarray ctl_numids; /* hash table for numids */ + struct xarray ctl_hash; /* hash table for ctl id matching */ + bool ctl_hash_collision; /* ctl_hash collision seen? */ +#endif + + struct snd_info_entry *proc_root; /* root for soundcard specific files */ + struct proc_dir_entry *proc_root_link; /* number link to real id */ + + struct list_head files_list; /* all files associated to this card */ + struct snd_shutdown_f_ops *s_f_ops; /* file operations in the shutdown + state */ + spinlock_t files_lock; /* lock the files for this card */ + int shutdown; /* this card is going down */ + struct completion *release_completion; + struct device *dev; /* device assigned to this card */ + struct device card_dev; /* cardX object for sysfs */ + const struct attribute_group *dev_groups[4]; /* assigned sysfs attr */ + bool registered; /* card_dev is registered? */ + bool managed; /* managed via devres */ + bool releasing; /* during card free process */ + int sync_irq; /* assigned irq, used for PCM sync */ + wait_queue_head_t remove_sleep; + + size_t total_pcm_alloc_bytes; /* total amount of allocated buffers */ + struct mutex memory_mutex; /* protection for the above */ +#ifdef CONFIG_SND_DEBUG + struct dentry *debugfs_root; /* debugfs root for card */ +#endif + +#ifdef CONFIG_PM + unsigned int power_state; /* power state */ + atomic_t power_ref; + wait_queue_head_t power_sleep; + wait_queue_head_t power_ref_sleep; +#endif + +#if IS_ENABLED(CONFIG_SND_MIXER_OSS) + struct snd_mixer_oss *mixer_oss; + int mixer_oss_change_count; +#endif +}; + +#define dev_to_snd_card(p) container_of(p, struct snd_card, card_dev) + +#ifdef CONFIG_PM +static inline unsigned int snd_power_get_state(struct snd_card *card) +{ + return READ_ONCE(card->power_state); +} + +static inline void snd_power_change_state(struct snd_card *card, unsigned int state) +{ + WRITE_ONCE(card->power_state, state); + wake_up(&card->power_sleep); +} + +/** + * snd_power_ref - Take the reference count for power control + * @card: sound card object + * + * The power_ref reference of the card is used for managing to block + * the snd_power_sync_ref() operation. This function increments the reference. + * The counterpart snd_power_unref() has to be called appropriately later. + */ +static inline void snd_power_ref(struct snd_card *card) +{ + atomic_inc(&card->power_ref); +} + +/** + * snd_power_unref - Release the reference count for power control + * @card: sound card object + */ +static inline void snd_power_unref(struct snd_card *card) +{ + if (atomic_dec_and_test(&card->power_ref)) + wake_up(&card->power_ref_sleep); +} + +/** + * snd_power_sync_ref - wait until the card power_ref is freed + * @card: sound card object + * + * This function is used to synchronize with the pending power_ref being + * released. + */ +static inline void snd_power_sync_ref(struct snd_card *card) +{ + wait_event(card->power_ref_sleep, !atomic_read(&card->power_ref)); +} + +/* init.c */ +int snd_power_wait(struct snd_card *card); +int snd_power_ref_and_wait(struct snd_card *card); + +#else /* ! CONFIG_PM */ + +static inline int snd_power_wait(struct snd_card *card) { return 0; } +static inline void snd_power_ref(struct snd_card *card) {} +static inline void snd_power_unref(struct snd_card *card) {} +static inline int snd_power_ref_and_wait(struct snd_card *card) { return 0; } +static inline void snd_power_sync_ref(struct snd_card *card) {} +#define snd_power_get_state(card) ({ (void)(card); SNDRV_CTL_POWER_D0; }) +#define snd_power_change_state(card, state) do { (void)(card); } while (0) + +#endif /* CONFIG_PM */ + +struct snd_minor { + int type; /* SNDRV_DEVICE_TYPE_XXX */ + int card; /* card number */ + int device; /* device number */ + const struct file_operations *f_ops; /* file operations */ + void *private_data; /* private data for f_ops->open */ + struct device *dev; /* device for sysfs */ + struct snd_card *card_ptr; /* assigned card instance */ +}; + +/* return a device pointer linked to each sound device as a parent */ +static inline struct device *snd_card_get_device_link(struct snd_card *card) +{ + return card ? &card->card_dev : NULL; +} + +/* sound.c */ + +extern int snd_major; +extern int snd_ecards_limit; +extern struct class *sound_class; +#ifdef CONFIG_SND_DEBUG +extern struct dentry *sound_debugfs_root; +#endif + +void snd_request_card(int card); + +void snd_device_initialize(struct device *dev, struct snd_card *card); + +int snd_register_device(int type, struct snd_card *card, int dev, + const struct file_operations *f_ops, + void *private_data, struct device *device); +int snd_unregister_device(struct device *dev); +void *snd_lookup_minor_data(unsigned int minor, int type); + +#ifdef CONFIG_SND_OSSEMUL +int snd_register_oss_device(int type, struct snd_card *card, int dev, + const struct file_operations *f_ops, void *private_data); +int snd_unregister_oss_device(int type, struct snd_card *card, int dev); +void *snd_lookup_oss_minor_data(unsigned int minor, int type); +#endif + +int snd_minor_info_init(void); + +/* sound_oss.c */ + +#ifdef CONFIG_SND_OSSEMUL +int snd_minor_info_oss_init(void); +#else +static inline int snd_minor_info_oss_init(void) { return 0; } +#endif + +/* memory.c */ + +int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count); +int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count); + +/* init.c */ + +int snd_card_locked(int card); +#if IS_ENABLED(CONFIG_SND_MIXER_OSS) +#define SND_MIXER_OSS_NOTIFY_REGISTER 0 +#define SND_MIXER_OSS_NOTIFY_DISCONNECT 1 +#define SND_MIXER_OSS_NOTIFY_FREE 2 +extern int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int cmd); +#endif + +int snd_card_new(struct device *parent, int idx, const char *xid, + struct module *module, int extra_size, + struct snd_card **card_ret); +int snd_devm_card_new(struct device *parent, int idx, const char *xid, + struct module *module, size_t extra_size, + struct snd_card **card_ret); + +int snd_card_disconnect(struct snd_card *card); +void snd_card_disconnect_sync(struct snd_card *card); +int snd_card_free(struct snd_card *card); +int snd_card_free_when_closed(struct snd_card *card); +int snd_card_free_on_error(struct device *dev, int ret); +void snd_card_set_id(struct snd_card *card, const char *id); +int snd_card_register(struct snd_card *card); +int snd_card_info_init(void); +int snd_card_add_dev_attr(struct snd_card *card, + const struct attribute_group *group); +int snd_component_add(struct snd_card *card, const char *component); +int snd_card_file_add(struct snd_card *card, struct file *file); +int snd_card_file_remove(struct snd_card *card, struct file *file); + +struct snd_card *snd_card_ref(int card); + +/** + * snd_card_unref - Unreference the card object + * @card: the card object to unreference + * + * Call this function for the card object that was obtained via snd_card_ref() + * or snd_lookup_minor_data(). + */ +static inline void snd_card_unref(struct snd_card *card) +{ + put_device(&card->card_dev); +} + +#define snd_card_set_dev(card, devptr) ((card)->dev = (devptr)) + +/* device.c */ + +int snd_device_new(struct snd_card *card, enum snd_device_type type, + void *device_data, const struct snd_device_ops *ops); +int snd_device_register(struct snd_card *card, void *device_data); +int snd_device_register_all(struct snd_card *card); +void snd_device_disconnect(struct snd_card *card, void *device_data); +void snd_device_disconnect_all(struct snd_card *card); +void snd_device_free(struct snd_card *card, void *device_data); +void snd_device_free_all(struct snd_card *card); +int snd_device_get_state(struct snd_card *card, void *device_data); + +/* isadma.c */ + +#ifdef CONFIG_ISA_DMA_API +#define DMA_MODE_NO_ENABLE 0x0100 + +void snd_dma_program(unsigned long dma, unsigned long addr, unsigned int size, unsigned short mode); +void snd_dma_disable(unsigned long dma); +unsigned int snd_dma_pointer(unsigned long dma, unsigned int size); +int snd_devm_request_dma(struct device *dev, int dma, const char *name); +#endif + +/* misc.c */ +struct resource; +void release_and_free_resource(struct resource *res); + +/* --- */ + +/* sound printk debug levels */ +enum { + SND_PR_ALWAYS, + SND_PR_DEBUG, + SND_PR_VERBOSE, +}; + +#if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK) +__printf(4, 5) +void __snd_printk(unsigned int level, const char *file, int line, + const char *format, ...); +#else +#define __snd_printk(level, file, line, format, ...) \ + printk(format, ##__VA_ARGS__) +#endif + +/** + * snd_printk - printk wrapper + * @fmt: format string + * + * Works like printk() but prints the file and the line of the caller + * when configured with CONFIG_SND_VERBOSE_PRINTK. + */ +#define snd_printk(fmt, ...) \ + __snd_printk(0, __FILE__, __LINE__, fmt, ##__VA_ARGS__) + +#ifdef CONFIG_SND_DEBUG +/** + * snd_printd - debug printk + * @fmt: format string + * + * Works like snd_printk() for debugging purposes. + * Ignored when CONFIG_SND_DEBUG is not set. + */ +#define snd_printd(fmt, ...) \ + __snd_printk(1, __FILE__, __LINE__, fmt, ##__VA_ARGS__) +#define _snd_printd(level, fmt, ...) \ + __snd_printk(level, __FILE__, __LINE__, fmt, ##__VA_ARGS__) + +/** + * snd_BUG - give a BUG warning message and stack trace + * + * Calls WARN() if CONFIG_SND_DEBUG is set. + * Ignored when CONFIG_SND_DEBUG is not set. + */ +#define snd_BUG() WARN(1, "BUG?\n") + +/** + * snd_printd_ratelimit - Suppress high rates of output when + * CONFIG_SND_DEBUG is enabled. + */ +#define snd_printd_ratelimit() printk_ratelimit() + +/** + * snd_BUG_ON - debugging check macro + * @cond: condition to evaluate + * + * Has the same behavior as WARN_ON when CONFIG_SND_DEBUG is set, + * otherwise just evaluates the conditional and returns the value. + */ +#define snd_BUG_ON(cond) WARN_ON((cond)) + +#else /* !CONFIG_SND_DEBUG */ + +__printf(1, 2) +static inline void snd_printd(const char *format, ...) {} +__printf(2, 3) +static inline void _snd_printd(int level, const char *format, ...) {} + +#define snd_BUG() do { } while (0) + +#define snd_BUG_ON(condition) ({ \ + int __ret_warn_on = !!(condition); \ + unlikely(__ret_warn_on); \ +}) + +static inline bool snd_printd_ratelimit(void) { return false; } + +#endif /* CONFIG_SND_DEBUG */ + +#ifdef CONFIG_SND_DEBUG_VERBOSE +/** + * snd_printdd - debug printk + * @format: format string + * + * Works like snd_printk() for debugging purposes. + * Ignored when CONFIG_SND_DEBUG_VERBOSE is not set. + */ +#define snd_printdd(format, ...) \ + __snd_printk(2, __FILE__, __LINE__, format, ##__VA_ARGS__) +#else +__printf(1, 2) +static inline void snd_printdd(const char *format, ...) {} +#endif + + +#define SNDRV_OSS_VERSION ((3<<16)|(8<<8)|(1<<4)|(0)) /* 3.8.1a */ + +/* for easier backward-porting */ +#if IS_ENABLED(CONFIG_GAMEPORT) +#define gameport_set_dev_parent(gp,xdev) ((gp)->dev.parent = (xdev)) +#define gameport_set_port_data(gp,r) ((gp)->port_data = (r)) +#define gameport_get_port_data(gp) (gp)->port_data +#endif + +/* PCI quirk list helper */ +struct snd_pci_quirk { + unsigned short subvendor; /* PCI subvendor ID */ + unsigned short subdevice; /* PCI subdevice ID */ + unsigned short subdevice_mask; /* bitmask to match */ + int value; /* value */ +#ifdef CONFIG_SND_DEBUG_VERBOSE + const char *name; /* name of the device (optional) */ +#endif +}; + +#define _SND_PCI_QUIRK_ID_MASK(vend, mask, dev) \ + .subvendor = (vend), .subdevice = (dev), .subdevice_mask = (mask) +#define _SND_PCI_QUIRK_ID(vend, dev) \ + _SND_PCI_QUIRK_ID_MASK(vend, 0xffff, dev) +#define SND_PCI_QUIRK_ID(vend,dev) {_SND_PCI_QUIRK_ID(vend, dev)} +#ifdef CONFIG_SND_DEBUG_VERBOSE +#define SND_PCI_QUIRK(vend,dev,xname,val) \ + {_SND_PCI_QUIRK_ID(vend, dev), .value = (val), .name = (xname)} +#define SND_PCI_QUIRK_VENDOR(vend, xname, val) \ + {_SND_PCI_QUIRK_ID_MASK(vend, 0, 0), .value = (val), .name = (xname)} +#define SND_PCI_QUIRK_MASK(vend, mask, dev, xname, val) \ + {_SND_PCI_QUIRK_ID_MASK(vend, mask, dev), \ + .value = (val), .name = (xname)} +#define snd_pci_quirk_name(q) ((q)->name) +#else +#define SND_PCI_QUIRK(vend,dev,xname,val) \ + {_SND_PCI_QUIRK_ID(vend, dev), .value = (val)} +#define SND_PCI_QUIRK_MASK(vend, mask, dev, xname, val) \ + {_SND_PCI_QUIRK_ID_MASK(vend, mask, dev), .value = (val)} +#define SND_PCI_QUIRK_VENDOR(vend, xname, val) \ + {_SND_PCI_QUIRK_ID_MASK(vend, 0, 0), .value = (val)} +#define snd_pci_quirk_name(q) "" +#endif + +#ifdef CONFIG_PCI +const struct snd_pci_quirk * +snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list); + +const struct snd_pci_quirk * +snd_pci_quirk_lookup_id(u16 vendor, u16 device, + const struct snd_pci_quirk *list); +#else +static inline const struct snd_pci_quirk * +snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list) +{ + return NULL; +} + +static inline const struct snd_pci_quirk * +snd_pci_quirk_lookup_id(u16 vendor, u16 device, + const struct snd_pci_quirk *list) +{ + return NULL; +} +#endif + +/* async signal helpers */ +struct snd_fasync; + +int snd_fasync_helper(int fd, struct file *file, int on, + struct snd_fasync **fasyncp); +void snd_kill_fasync(struct snd_fasync *fasync, int signal, int poll); +void snd_fasync_free(struct snd_fasync *fasync); + +#endif /* __SOUND_CORE_H */ |