68 lines · c
1/* SPDX-License-Identifier: GPL-2.0-or-later */2#ifndef __SOUND_HWDEP_H3#define __SOUND_HWDEP_H4 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_OSSEMUL48 int oss_type;49 int ossreg;50#endif51 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