diff options
Diffstat (limited to 'include/sound/core.h')
| -rw-r--r-- | include/sound/core.h | 218 |
1 files changed, 104 insertions, 114 deletions
diff --git a/include/sound/core.h b/include/sound/core.h index 55385588eefa..64327e971122 100644 --- a/include/sound/core.h +++ b/include/sound/core.h @@ -1,25 +1,10 @@ +/* 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> - * - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * */ #include <linux/device.h> @@ -29,6 +14,7 @@ #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 @@ -51,7 +37,6 @@ struct completion; */ enum snd_device_type { SNDRV_DEV_LOWLEVEL, - SNDRV_DEV_CONTROL, SNDRV_DEV_INFO, SNDRV_DEV_BUS, SNDRV_DEV_CODEC, @@ -62,6 +47,7 @@ enum snd_device_type { SNDRV_DEV_SEQUENCER, SNDRV_DEV_HWDEP, SNDRV_DEV_JACK, + SNDRV_DEV_CONTROL, /* NOTE: this must be the last one */ }; enum snd_device_state { @@ -84,7 +70,7 @@ struct snd_device { enum snd_device_state state; /* state of the device */ enum snd_device_type type; /* device type */ void *device_data; /* device structure */ - struct snd_device_ops *ops; /* operations */ + const struct snd_device_ops *ops; /* operations */ }; #define snd_device(n) list_entry(n, struct snd_device, list) @@ -110,19 +96,21 @@ struct snd_card { private data */ struct list_head devices; /* devices */ - struct device ctl_dev; /* control device */ + 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 */ + struct rw_semaphore controls_rwsem; /* controls lock (list and values) */ + rwlock_t controls_rwlock; /* lock for lookup and ctl_files list */ int controls_count; /* count of all controls */ - int user_ctl_count; /* count of all user 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 */ - struct mutex user_ctl_lock; /* protects user controls against - concurrent access */ +#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 snd_info_entry *proc_id; /* the card id */ struct proc_dir_entry *proc_root_link; /* number link to real id */ struct list_head files_list; /* all files associated to this card */ @@ -135,11 +123,22 @@ struct snd_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 */ - struct mutex power_lock; /* power lock */ + 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) @@ -151,35 +150,63 @@ struct snd_card { #define dev_to_snd_card(p) container_of(p, struct snd_card, card_dev) #ifdef CONFIG_PM -static inline void snd_power_lock(struct snd_card *card) +static inline unsigned int snd_power_get_state(struct snd_card *card) { - mutex_lock(&card->power_lock); + return READ_ONCE(card->power_state); } -static inline void snd_power_unlock(struct snd_card *card) +static inline void snd_power_change_state(struct snd_card *card, unsigned int state) { - mutex_unlock(&card->power_lock); + WRITE_ONCE(card->power_state, state); + wake_up(&card->power_sleep); } -static inline unsigned int snd_power_get_state(struct snd_card *card) +/** + * 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) { - return card->power_state; + atomic_inc(&card->power_ref); } -static inline void snd_power_change_state(struct snd_card *card, unsigned int state) +/** + * snd_power_unref - Release the reference count for power control + * @card: sound card object + */ +static inline void snd_power_unref(struct snd_card *card) { - card->power_state = state; - wake_up(&card->power_sleep); + 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, unsigned int power_state); +int snd_power_wait(struct snd_card *card); +int snd_power_ref_and_wait(struct snd_card *card); #else /* ! CONFIG_PM */ -#define snd_power_lock(card) do { (void)(card); } while (0) -#define snd_power_unlock(card) do { (void)(card); } while (0) -static inline int snd_power_wait(struct snd_card *card, unsigned int state) { return 0; } +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) @@ -205,11 +232,14 @@ static inline struct device *snd_card_get_device_link(struct snd_card *card) extern int snd_major; extern int snd_ecards_limit; -extern struct class *sound_class; +extern const 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_device_alloc(struct device **dev_p, struct snd_card *card); int snd_register_device(int type, struct snd_card *card, int dev, const struct file_operations *f_ops, @@ -241,7 +271,6 @@ int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size /* init.c */ -extern struct snd_card *snd_cards[SNDRV_CARDS]; int snd_card_locked(int card); #if IS_ENABLED(CONFIG_SND_MIXER_OSS) #define SND_MIXER_OSS_NOTIFY_REGISTER 0 @@ -253,10 +282,15 @@ extern int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int cmd); 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_card_disconnect(struct snd_card *card); -int snd_card_free(struct snd_card *card); -int snd_card_free_when_closed(struct snd_card *card); +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); + +void snd_card_disconnect(struct snd_card *card); +void snd_card_disconnect_sync(struct snd_card *card); +void snd_card_free(struct snd_card *card); +void 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); @@ -265,14 +299,27 @@ int snd_card_add_dev_attr(struct snd_card *card, 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); -#define snd_card_unref(card) put_device(&(card)->card_dev) + +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, struct snd_device_ops *ops); + 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); @@ -288,6 +335,7 @@ void snd_device_free_all(struct snd_card *card); 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 */ @@ -296,46 +344,8 @@ 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. @@ -344,11 +354,6 @@ void __snd_printk(unsigned int level, const char *file, int line, #define snd_BUG() WARN(1, "BUG?\n") /** - * 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 * @@ -359,11 +364,6 @@ void __snd_printk(unsigned int level, const char *file, int line, #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) ({ \ @@ -371,26 +371,8 @@ static inline void _snd_printd(int level, const char *format, ...) {} 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 */ @@ -457,4 +439,12 @@ snd_pci_quirk_lookup_id(u16 vendor, u16 device, } #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 */ |