LXR linux/include/sound/hwdep.h

   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
  13struct snd_hwdep;
  14
  15/* hwdep file ops; all ops can be NULL */
  16struct 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
  39struct 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
  64extern int snd_hwdep_new(struct snd_card *card, char *id, int device,
  65                         struct snd_hwdep **rhwdep);
  66
  67#endif /* __SOUND_HWDEP_H */
  68