[go: nahoru, domu]
1/*
2 * u_uac1.h -- interface to USB gadget "ALSA AUDIO" utilities
3 *
4 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
5 * Copyright (C) 2008 Analog Devices, Inc
6 *
7 * Enter bugs at http://blackfin.uclinux.org/
8 *
9 * Licensed under the GPL-2 or later.
10 */
11
12#ifndef __U_AUDIO_H
13#define __U_AUDIO_H
14
15#include <linux/device.h>
16#include <linux/err.h>
17#include <linux/usb/audio.h>
18#include <linux/usb/composite.h>
19
20#include <sound/core.h>
21#include <sound/pcm.h>
22#include <sound/pcm_params.h>
23
24#include "gadget_chips.h"
25
26#define FILE_PCM_PLAYBACK	"/dev/snd/pcmC0D0p"
27#define FILE_PCM_CAPTURE	"/dev/snd/pcmC0D0c"
28#define FILE_CONTROL		"/dev/snd/controlC0"
29
30#define UAC1_OUT_EP_MAX_PACKET_SIZE	200
31#define UAC1_REQ_COUNT			256
32#define UAC1_AUDIO_BUF_SIZE		48000
33
34/*
35 * This represents the USB side of an audio card device, managed by a USB
36 * function which provides control and stream interfaces.
37 */
38
39struct gaudio_snd_dev {
40	struct gaudio			*card;
41	struct file			*filp;
42	struct snd_pcm_substream	*substream;
43	int				access;
44	int				format;
45	int				channels;
46	int				rate;
47};
48
49struct gaudio {
50	struct usb_function		func;
51	struct usb_gadget		*gadget;
52
53	/* ALSA sound device interfaces */
54	struct gaudio_snd_dev		control;
55	struct gaudio_snd_dev		playback;
56	struct gaudio_snd_dev		capture;
57
58	/* TODO */
59};
60
61struct f_uac1_opts {
62	struct usb_function_instance	func_inst;
63	int				req_buf_size;
64	int				req_count;
65	int				audio_buf_size;
66	char				*fn_play;
67	char				*fn_cap;
68	char				*fn_cntl;
69	unsigned			bound:1;
70	unsigned			fn_play_alloc:1;
71	unsigned			fn_cap_alloc:1;
72	unsigned			fn_cntl_alloc:1;
73	struct gaudio			*card;
74	struct mutex			lock;
75	int				refcnt;
76};
77
78int gaudio_setup(struct gaudio *card);
79void gaudio_cleanup(struct gaudio *the_card);
80
81size_t u_audio_playback(struct gaudio *card, void *buf, size_t count);
82int u_audio_get_playback_channels(struct gaudio *card);
83int u_audio_get_playback_rate(struct gaudio *card);
84
85#endif /* __U_AUDIO_H */
86