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kernel/linux-imx6_3.14.28/include/sound/seq_oss.h 2.86 KB
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  #ifndef __SOUND_SEQ_OSS_H
  #define __SOUND_SEQ_OSS_H
  
  /*
   * OSS compatible sequencer driver
   *
   * Copyright (C) 1998,99 Takashi Iwai
   *
   * 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 <sound/asequencer.h>
  #include <sound/seq_kernel.h>
  
  /*
   * argument structure for synthesizer operations
   */
  struct snd_seq_oss_arg {
  	/* given by OSS sequencer */
  	int app_index;	/* application unique index */
  	int file_mode;	/* file mode - see below */
  	int seq_mode;	/* sequencer mode - see below */
  
  	/* following must be initialized in open callback */
  	struct snd_seq_addr addr;	/* opened port address */
  	void *private_data;	/* private data for lowlevel drivers */
  
  	/* note-on event passing mode: initially given by OSS seq,
  	 * but configurable by drivers - see below
  	 */
  	int event_passing;
  };
  
  
  /*
   * synthesizer operation callbacks
   */
  struct snd_seq_oss_callback {
  	struct module *owner;
  	int (*open)(struct snd_seq_oss_arg *p, void *closure);
  	int (*close)(struct snd_seq_oss_arg *p);
  	int (*ioctl)(struct snd_seq_oss_arg *p, unsigned int cmd, unsigned long arg);
  	int (*load_patch)(struct snd_seq_oss_arg *p, int format, const char __user *buf, int offs, int count);
  	int (*reset)(struct snd_seq_oss_arg *p);
  	int (*raw_event)(struct snd_seq_oss_arg *p, unsigned char *data);
  };
  
  /* flag: file_mode */
  #define SNDRV_SEQ_OSS_FILE_ACMODE		3
  #define SNDRV_SEQ_OSS_FILE_READ		1
  #define SNDRV_SEQ_OSS_FILE_WRITE		2
  #define SNDRV_SEQ_OSS_FILE_NONBLOCK	4
  
  /* flag: seq_mode */
  #define SNDRV_SEQ_OSS_MODE_SYNTH		0
  #define SNDRV_SEQ_OSS_MODE_MUSIC		1
  
  /* flag: event_passing */
  #define SNDRV_SEQ_OSS_PROCESS_EVENTS	0	/* key == 255 is processed as velocity change */
  #define SNDRV_SEQ_OSS_PASS_EVENTS		1	/* pass all events to callback */
  #define SNDRV_SEQ_OSS_PROCESS_KEYPRESS	2	/* key >= 128 will be processed as key-pressure */
  
  /* default control rate: fixed */
  #define SNDRV_SEQ_OSS_CTRLRATE		100
  
  /* default max queue length: configurable by module option */
  #define SNDRV_SEQ_OSS_MAX_QLEN		1024
  
  
  /*
   * data pointer to snd_seq_register_device
   */
  struct snd_seq_oss_reg {
  	int type;
  	int subtype;
  	int nvoices;
  	struct snd_seq_oss_callback oper;
  	void *private_data;
  };
  
  /* device id */
  #define SNDRV_SEQ_DEV_ID_OSS		"seq-oss"
  
  #endif /* __SOUND_SEQ_OSS_H */