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 34 struct 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 44 struct 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 56 struct 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 72 int gaudio_setup(struct gaudio *card); 73 void gaudio_cleanup(struct gaudio *the_card); 74 75 size_t u_audio_playback(struct gaudio *card, void *buf, size_t count); 76 int u_audio_get_playback_channels(struct gaudio *card); 77 int u_audio_get_playback_rate(struct gaudio *card); 78 79 #endif /* __U_UAC1_LEGACY_H */ 80