root/include/sound/hwdep.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef __SOUND_HWDEP_H
   3 #define __SOUND_HWDEP_H
   4 
   5 /*
   6  *  Hardware dependent layer 
   7  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   8  */
   9 
  10 #include <sound/asound.h>
  11 #include <linux/poll.h>
  12 
  13 struct snd_hwdep;
  14 
  15 /* hwdep file ops; all ops can be NULL */
  16 struct snd_hwdep_ops {
  17         long long (*llseek)(struct snd_hwdep *hw, struct file *file,
  18                             long long offset, int orig);
  19         long (*read)(struct snd_hwdep *hw, char __user *buf,
  20                      long count, loff_t *offset);
  21         long (*write)(struct snd_hwdep *hw, const char __user *buf,
  22                       long count, loff_t *offset);
  23         int (*open)(struct snd_hwdep *hw, struct file * file);
  24         int (*release)(struct snd_hwdep *hw, struct file * file);
  25         __poll_t (*poll)(struct snd_hwdep *hw, struct file *file,
  26                              poll_table *wait);
  27         int (*ioctl)(struct snd_hwdep *hw, struct file *file,
  28                      unsigned int cmd, unsigned long arg);
  29         int (*ioctl_compat)(struct snd_hwdep *hw, struct file *file,
  30                             unsigned int cmd, unsigned long arg);
  31         int (*mmap)(struct snd_hwdep *hw, struct file *file,
  32                     struct vm_area_struct *vma);
  33         int (*dsp_status)(struct snd_hwdep *hw,
  34                           struct snd_hwdep_dsp_status *status);
  35         int (*dsp_load)(struct snd_hwdep *hw,
  36                         struct snd_hwdep_dsp_image *image);
  37 };
  38 
  39 struct snd_hwdep {
  40         struct snd_card *card;
  41         struct list_head list;
  42         int device;
  43         char id[32];
  44         char name[80];
  45         int iface;
  46 
  47 #ifdef CONFIG_SND_OSSEMUL
  48         int oss_type;
  49         int ossreg;
  50 #endif
  51 
  52         struct snd_hwdep_ops ops;
  53         wait_queue_head_t open_wait;
  54         void *private_data;
  55         void (*private_free) (struct snd_hwdep *hwdep);
  56         struct device dev;
  57 
  58         struct mutex open_mutex;
  59         int used;                       /* reference counter */
  60         unsigned int dsp_loaded;        /* bit fields of loaded dsp indices */
  61         unsigned int exclusive:1;       /* exclusive access mode */
  62 };
  63 
  64 extern int snd_hwdep_new(struct snd_card *card, char *id, int device,
  65                          struct snd_hwdep **rhwdep);
  66 
  67 #endif /* __SOUND_HWDEP_H */