projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| eb9fecb9 RB |
2 | /* |
| 3 | * u_audio.h -- interface to USB gadget "ALSA sound card" utilities | |
| 4 | * | |
| 5 | * Copyright (C) 2016 | |
| 6 | * Author: Ruslan Bilovol <ruslan.bilovol@gmail.com> | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or modify | |
| 9 | * it under the terms of the GNU General Public License as published by | |
| 10 | * the Free Software Foundation; either version 2 of the License, or | |
| 11 | * (at your option) any later version. | |
| 12 | * | |
| 13 | * This program is distributed in the hope that it will be useful, | |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 16 | * GNU General Public License for more details. | |
| 17 | * | |
| 18 | */ | |
| 19 | ||
| 20 | #ifndef __U_AUDIO_H | |
| 21 | #define __U_AUDIO_H | |
| 22 | ||
| 23 | #include <linux/usb/composite.h> | |
| 24 | ||
| 25 | struct uac_params { | |
| 26 | /* playback */ | |
| 27 | int p_chmask; /* channel mask */ | |
| 28 | int p_srate; /* rate in Hz */ | |
| 29 | int p_ssize; /* sample size */ | |
| 30 | ||
| 31 | /* capture */ | |
| 32 | int c_chmask; /* channel mask */ | |
| 33 | int c_srate; /* rate in Hz */ | |
| 34 | int c_ssize; /* sample size */ | |
| 35 | ||
| 36 | int req_number; /* number of preallocated requests */ | |
| 37 | }; | |
| 38 | ||
| 39 | struct g_audio { | |
| 40 | struct usb_function func; | |
| 41 | struct usb_gadget *gadget; | |
| 42 | ||
| 43 | struct usb_ep *in_ep; | |
| 44 | struct usb_ep *out_ep; | |
| 45 | ||
| 46 | /* Max packet size for all in_ep possible speeds */ | |
| 47 | unsigned int in_ep_maxpsize; | |
| 48 | /* Max packet size for all out_ep possible speeds */ | |
| 49 | unsigned int out_ep_maxpsize; | |
| 50 | ||
| 51 | /* The ALSA Sound Card it represents on the USB-Client side */ | |
| 52 | struct snd_uac_chip *uac; | |
| 53 | ||
| 54 | struct uac_params params; | |
| 55 | }; | |
| 56 | ||
| 57 | static inline struct g_audio *func_to_g_audio(struct usb_function *f) | |
| 58 | { | |
| 59 | return container_of(f, struct g_audio, func); | |
| 60 | } | |
| 61 | ||
| 62 | static inline uint num_channels(uint chanmask) | |
| 63 | { | |
| 64 | uint num = 0; | |
| 65 | ||
| 66 | while (chanmask) { | |
| 67 | num += (chanmask & 1); | |
| 68 | chanmask >>= 1; | |
| 69 | } | |
| 70 | ||
| 71 | return num; | |
| 72 | } | |
| 73 | ||
| 74 | /* | |
| 75 | * g_audio_setup - initialize one virtual ALSA sound card | |
| 76 | * @g_audio: struct with filled params, in_ep_maxpsize, out_ep_maxpsize | |
| 77 | * @pcm_name: the id string for a PCM instance of this sound card | |
| 78 | * @card_name: name of this soundcard | |
| 79 | * | |
| 80 | * This sets up the single virtual ALSA sound card that may be exported by a | |
| 81 | * gadget driver using this framework. | |
| 82 | * | |
| 83 | * Context: may sleep | |
| 84 | * | |
| 85 | * Returns zero on success, or a negative error on failure. | |
| 86 | */ | |
| 87 | int g_audio_setup(struct g_audio *g_audio, const char *pcm_name, | |
| 88 | const char *card_name); | |
| 89 | void g_audio_cleanup(struct g_audio *g_audio); | |
| 90 | ||
| 91 | int u_audio_start_capture(struct g_audio *g_audio); | |
| 92 | void u_audio_stop_capture(struct g_audio *g_audio); | |
| 93 | int u_audio_start_playback(struct g_audio *g_audio); | |
| 94 | void u_audio_stop_playback(struct g_audio *g_audio); | |
| 95 | ||
| 96 | #endif /* __U_AUDIO_H */ |