root/include/sound/seq_device.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef __SOUND_SEQ_DEVICE_H
   3 #define __SOUND_SEQ_DEVICE_H
   4 
   5 /*
   6  *  ALSA sequencer device management
   7  *  Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de>
   8  */
   9 
  10 /*
  11  * registered device information
  12  */
  13 
  14 struct snd_seq_device {
  15         /* device info */
  16         struct snd_card *card;  /* sound card */
  17         int device;             /* device number */
  18         const char *id;         /* driver id */
  19         char name[80];          /* device name */
  20         int argsize;            /* size of the argument */
  21         void *driver_data;      /* private data for driver */
  22         void *private_data;     /* private data for the caller */
  23         void (*private_free)(struct snd_seq_device *device);
  24         struct device dev;
  25 };
  26 
  27 #define to_seq_dev(_dev) \
  28         container_of(_dev, struct snd_seq_device, dev)
  29 
  30 /* sequencer driver */
  31 
  32 /* driver operators
  33  * probe:
  34  *      Initialize the device with given parameters.
  35  *      Typically,
  36  *              1. call snd_hwdep_new
  37  *              2. allocate private data and initialize it
  38  *              3. call snd_hwdep_register
  39  *              4. store the instance to dev->driver_data pointer.
  40  *              
  41  * remove:
  42  *      Release the private data.
  43  *      Typically, call snd_device_free(dev->card, dev->driver_data)
  44  */
  45 struct snd_seq_driver {
  46         struct device_driver driver;
  47         char *id;
  48         int argsize;
  49 };
  50 
  51 #define to_seq_drv(_drv) \
  52         container_of(_drv, struct snd_seq_driver, driver)
  53 
  54 /*
  55  * prototypes
  56  */
  57 #ifdef CONFIG_MODULES
  58 void snd_seq_device_load_drivers(void);
  59 #else
  60 #define snd_seq_device_load_drivers()
  61 #endif
  62 int snd_seq_device_new(struct snd_card *card, int device, const char *id,
  63                        int argsize, struct snd_seq_device **result);
  64 
  65 #define SNDRV_SEQ_DEVICE_ARGPTR(dev) (void *)((char *)(dev) + sizeof(struct snd_seq_device))
  66 
  67 int __must_check __snd_seq_driver_register(struct snd_seq_driver *drv,
  68                                            struct module *mod);
  69 #define snd_seq_driver_register(drv) \
  70         __snd_seq_driver_register(drv, THIS_MODULE)
  71 void snd_seq_driver_unregister(struct snd_seq_driver *drv);
  72 
  73 #define module_snd_seq_driver(drv) \
  74         module_driver(drv, snd_seq_driver_register, snd_seq_driver_unregister)
  75 
  76 /*
  77  * id strings for generic devices
  78  */
  79 #define SNDRV_SEQ_DEV_ID_MIDISYNTH      "seq-midi"
  80 #define SNDRV_SEQ_DEV_ID_OPL3           "opl3-synth"
  81 
  82 #endif /* __SOUND_SEQ_DEVICE_H */