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