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 #define FILE_PCM_PLAYBACK "/dev/snd/pcmC0D0p" 25 #define FILE_PCM_CAPTURE "/dev/snd/pcmC0D0c" 26 #define FILE_CONTROL "/dev/snd/controlC0" 27 28 #define UAC1_OUT_EP_MAX_PACKET_SIZE 200 29 #define UAC1_REQ_COUNT 256 30 #define UAC1_AUDIO_BUF_SIZE 48000 31 32 /* 33 * This represents the USB side of an audio card device, managed by a USB 34 * function which provides control and stream interfaces. 35 */ 36 37 struct gaudio_snd_dev { 38 struct gaudio *card; 39 struct file *filp; 40 struct snd_pcm_substream *substream; 41 int access; 42 int format; 43 int channels; 44 int rate; 45 }; 46 47 struct gaudio { 48 struct usb_function func; 49 struct usb_gadget *gadget; 50 51 /* ALSA sound device interfaces */ 52 struct gaudio_snd_dev control; 53 struct gaudio_snd_dev playback; 54 struct gaudio_snd_dev capture; 55 56 /* TODO */ 57 }; 58 59 struct f_uac1_opts { 60 struct usb_function_instance func_inst; 61 int req_buf_size; 62 int req_count; 63 int audio_buf_size; 64 char *fn_play; 65 char *fn_cap; 66 char *fn_cntl; 67 unsigned bound:1; 68 unsigned fn_play_alloc:1; 69 unsigned fn_cap_alloc:1; 70 unsigned fn_cntl_alloc:1; 71 struct mutex lock; 72 int refcnt; 73 }; 74 75 int gaudio_setup(struct gaudio *card); 76 void gaudio_cleanup(struct gaudio *the_card); 77 78 size_t u_audio_playback(struct gaudio *card, void *buf, size_t count); 79 int u_audio_get_playback_channels(struct gaudio *card); 80 int u_audio_get_playback_rate(struct gaudio *card); 81 82 #endif /* __U_AUDIO_H */ 83