sound/core/seq/seq_ports.h

Source file repositories/reference/linux-study-clean/sound/core/seq/seq_ports.h

File Facts

System
Linux kernel
Corpus path
sound/core/seq/seq_ports.h
Extension
.h
Size
4889 bytes
Lines
145
Domain
Driver Families
Bucket
sound/core
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct snd_seq_subscribers {
	struct snd_seq_port_subscribe info;	/* additional info */
	struct list_head src_list;	/* link of sources */
	struct list_head dest_list;	/* link of destinations */
	atomic_t ref_count;
};

struct snd_seq_port_subs_info {
	struct list_head list_head;	/* list of subscribed ports */
	unsigned int count;		/* count of subscribers */
	unsigned int exclusive: 1;	/* exclusive mode */
	struct rw_semaphore list_mutex;
	rwlock_t list_lock;
	int (*open)(void *private_data, struct snd_seq_port_subscribe *info);
	int (*close)(void *private_data, struct snd_seq_port_subscribe *info);
};

struct snd_seq_client_port {

	struct snd_seq_addr addr;	/* client/port number */
	struct module *owner;		/* owner of this port */
	char name[64];			/* port name */	
	struct list_head list;		/* port list */
	snd_use_lock_t use_lock;

	/* subscribers */
	struct snd_seq_port_subs_info c_src;	/* read (sender) list */
	struct snd_seq_port_subs_info c_dest;	/* write (dest) list */

	int (*event_input)(struct snd_seq_event *ev, int direct, void *private_data,
			   int atomic, int hop);
	void (*private_free)(void *private_data);
	void *private_data;
	unsigned int closing : 1;
	unsigned int timestamping: 1;
	unsigned int time_real: 1;
	int time_queue;
	
	/* capability, inport, output, sync */
	unsigned int capability;	/* port capability bits */
	unsigned int type;		/* port type bits */

	/* supported channels */
	int midi_channels;
	int midi_voices;
	int synth_voices;
		
	/* UMP direction and group */
	unsigned char direction;
	unsigned char ump_group;

	bool is_midi1;	/* keep MIDI 1.0 protocol */

#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
	struct ump_cvt_to_ump_bank midi2_bank[16]; /* per channel */
#endif
};

struct snd_seq_client;

/* return pointer to port structure and lock port */
struct snd_seq_client_port *snd_seq_port_use_ptr(struct snd_seq_client *client, int num);

/* search for next port - port is locked if found */
struct snd_seq_client_port *snd_seq_port_query_nearest(struct snd_seq_client *client,
						       struct snd_seq_port_info *pinfo);

/* unlock the port */
#define snd_seq_port_unlock(port) snd_use_lock_free(&(port)->use_lock)

DEFINE_FREE(snd_seq_port, struct snd_seq_client_port *, if (!IS_ERR_OR_NULL(_T)) snd_seq_port_unlock(_T))

/* create a port, 0 on success or a negative error code is returned */
int snd_seq_create_port(struct snd_seq_client *client,
			struct snd_seq_client_port **port_ret);

/* insert the port; return the port address or a negative error code */
int snd_seq_insert_port(struct snd_seq_client *client, int port,
			struct snd_seq_client_port *new_port);

/* delete a port */
int snd_seq_delete_port(struct snd_seq_client *client, int port);

/* delete all ports */
int snd_seq_delete_all_ports(struct snd_seq_client *client);

/* set port info fields */
int snd_seq_set_port_info(struct snd_seq_client_port *port,
			  struct snd_seq_port_info *info);

Annotation

Implementation Notes