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 39 struct 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 49 struct 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 61 struct 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 78 int gaudio_setup(struct gaudio *card); 79 void gaudio_cleanup(struct gaudio *the_card); 80 81 size_t u_audio_playback(struct gaudio *card, void *buf, size_t count); 82 int u_audio_get_playback_channels(struct gaudio *card); 83 int u_audio_get_playback_rate(struct gaudio *card); 84 85 #endif /* __U_AUDIO_H */ 86