1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * u_uac1.h -- interface to USB gadget "ALSA AUDIO" utilities
4 *
5 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
6 * Copyright (C) 2008 Analog Devices, Inc
7 */
8
9#ifndef __U_UAC1_LEGACY_H
10#define __U_UAC1_LEGACY_H
11
12#include <linux/device.h>
13#include <linux/err.h>
14#include <linux/usb/audio.h>
15#include <linux/usb/composite.h>
16
17#include <sound/core.h>
18#include <sound/pcm.h>
19#include <sound/pcm_params.h>
20
21#define FILE_PCM_PLAYBACK	"/dev/snd/pcmC0D0p"
22#define FILE_PCM_CAPTURE	"/dev/snd/pcmC0D0c"
23#define FILE_CONTROL		"/dev/snd/controlC0"
24
25#define UAC1_OUT_EP_MAX_PACKET_SIZE	200
26#define UAC1_REQ_COUNT			256
27#define UAC1_AUDIO_BUF_SIZE		48000
28
29/*
30 * This represents the USB side of an audio card device, managed by a USB
31 * function which provides control and stream interfaces.
32 */
33
34struct gaudio_snd_dev {
35	struct gaudio			*card;
36	struct file			*filp;
37	struct snd_pcm_substream	*substream;
38	int				access;
39	int				format;
40	int				channels;
41	int				rate;
42};
43
44struct gaudio {
45	struct usb_function		func;
46	struct usb_gadget		*gadget;
47
48	/* ALSA sound device interfaces */
49	struct gaudio_snd_dev		control;
50	struct gaudio_snd_dev		playback;
51	struct gaudio_snd_dev		capture;
52
53	/* TODO */
54};
55
56struct f_uac1_legacy_opts {
57	struct usb_function_instance	func_inst;
58	int				req_buf_size;
59	int				req_count;
60	int				audio_buf_size;
61	char				*fn_play;
62	char				*fn_cap;
63	char				*fn_cntl;
64	unsigned			bound:1;
65	unsigned			fn_play_alloc:1;
66	unsigned			fn_cap_alloc:1;
67	unsigned			fn_cntl_alloc:1;
68	struct mutex			lock;
69	int				refcnt;
70};
71
72int gaudio_setup(struct gaudio *card);
73void gaudio_cleanup(struct gaudio *the_card);
74
75size_t u_audio_playback(struct gaudio *card, void *buf, size_t count);
76int u_audio_get_playback_channels(struct gaudio *card);
77int u_audio_get_playback_rate(struct gaudio *card);
78
79#endif /* __U_UAC1_LEGACY_H */
80