sound/core/seq/oss/seq_oss_device.h

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

File Facts

System
Linux kernel
Corpus path
sound/core/seq/oss/seq_oss_device.h
Extension
.h
Size
3825 bytes
Lines
155
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 seq_oss_chinfo {
	int note, vel;
};

/*
 * synthesizer information
 */
struct seq_oss_synthinfo {
	struct snd_seq_oss_arg arg;
	struct seq_oss_chinfo *ch;
	int nr_voices;
	int opened;
	int is_midi;
	int midi_mapped;
};


/*
 * sequencer client information
 */

struct seq_oss_devinfo {

	int index;	/* application index */
	int cseq;	/* sequencer client number */
	int port;	/* sequencer port number */
	int queue;	/* sequencer queue number */

	struct snd_seq_addr addr;	/* address of this device */

	int seq_mode;	/* sequencer mode */
	int file_mode;	/* file access */

	/* midi device table */
	int max_mididev;

	/* synth device table */
	int max_synthdev;
	struct seq_oss_synthinfo synths[SNDRV_SEQ_OSS_MAX_SYNTH_DEVS];
	int synth_opened;

	/* output queue */
	struct seq_oss_writeq *writeq;

	/* midi input queue */
	struct seq_oss_readq *readq;

	/* timer */
	struct seq_oss_timer *timer;
};


/*
 * function prototypes
 */

/* create/delete OSS sequencer client */
int snd_seq_oss_create_client(void);
int snd_seq_oss_delete_client(void);

/* device file interface */
int snd_seq_oss_open(struct file *file, int level);
void snd_seq_oss_release(struct seq_oss_devinfo *dp);
int snd_seq_oss_ioctl(struct seq_oss_devinfo *dp, unsigned int cmd, unsigned long arg);
int snd_seq_oss_read(struct seq_oss_devinfo *dev, char __user *buf, int count);
int snd_seq_oss_write(struct seq_oss_devinfo *dp, const char __user *buf, int count, struct file *opt);
__poll_t snd_seq_oss_poll(struct seq_oss_devinfo *dp, struct file *file, poll_table * wait);

void snd_seq_oss_reset(struct seq_oss_devinfo *dp);

/* proc interface */
void snd_seq_oss_system_info_read(struct snd_info_buffer *buf);
void snd_seq_oss_midi_info_read(struct snd_info_buffer *buf);
void snd_seq_oss_synth_info_read(struct snd_info_buffer *buf);
void snd_seq_oss_readq_info_read(struct seq_oss_readq *q, struct snd_info_buffer *buf);

/* file mode macros */
#define is_read_mode(mode)	((mode) & SNDRV_SEQ_OSS_FILE_READ)
#define is_write_mode(mode)	((mode) & SNDRV_SEQ_OSS_FILE_WRITE)
#define is_nonblock_mode(mode)	((mode) & SNDRV_SEQ_OSS_FILE_NONBLOCK)

/* dispatch event */
static inline int
snd_seq_oss_dispatch(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, int atomic, int hop)
{
	return snd_seq_kernel_client_dispatch(dp->cseq, ev, atomic, hop);
}

/* ioctl for writeq */
static inline int

Annotation

Implementation Notes