/* 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 lock (list and values) */
        rwlock_t controls_rwlock;       /* lock for lookup and ctl_files list */
        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 const struct class sound_class;
#ifdef CONFIG_SND_DEBUG
extern struct dentry *sound_debugfs_root;
#endif

void snd_request_card(int 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,
                        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);

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);
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);

/* 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);

/* --- */

#ifdef CONFIG_SND_DEBUG
/**
 * 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_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 */

#define snd_BUG()                       do { } while (0)

#define snd_BUG_ON(condition) ({ \
        int __ret_warn_on = !!(condition); \
        unlikely(__ret_warn_on); \
})

#endif /* CONFIG_SND_DEBUG */

#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 */