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 */ 68