136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* u_audio.h -- interface to USB gadget "ALSA sound card" utilities
|
|
*
|
|
* Copyright (C) 2016
|
|
* Author: Ruslan Bilovol <ruslan.bilovol@gmail.com>
|
|
*/
|
|
|
|
#ifndef __U_AUDIO_H
|
|
#define __U_AUDIO_H
|
|
|
|
#include <linux/usb/composite.h>
|
|
#include "uac_common.h"
|
|
|
|
/*
|
|
* Same maximum frequency deviation on the slower side as in
|
|
* sound/usb/endpoint.c. Value is expressed in per-mil deviation.
|
|
*/
|
|
#define FBACK_SLOW_MAX 250
|
|
|
|
/*
|
|
* Maximum frequency deviation on the faster side, default value for UAC1/2.
|
|
* Value is expressed in per-mil deviation.
|
|
* UAC2 provides the value as a parameter as it impacts the endpoint required
|
|
* bandwidth.
|
|
*/
|
|
#define FBACK_FAST_MAX 5
|
|
|
|
/* Feature Unit parameters */
|
|
struct uac_fu_params {
|
|
int id; /* Feature Unit ID */
|
|
|
|
bool mute_present; /* mute control enable */
|
|
|
|
bool volume_present; /* volume control enable */
|
|
s16 volume_min; /* min volume in 1/256 dB */
|
|
s16 volume_max; /* max volume in 1/256 dB */
|
|
s16 volume_res; /* volume resolution in 1/256 dB */
|
|
};
|
|
|
|
struct uac_params {
|
|
/* playback */
|
|
int p_chmask; /* channel mask */
|
|
int p_srates[UAC_MAX_RATES]; /* available rates in Hz (0 terminated list) */
|
|
int p_ssize; /* sample size */
|
|
struct uac_fu_params p_fu; /* Feature Unit parameters */
|
|
|
|
/* capture */
|
|
int c_chmask; /* channel mask */
|
|
int c_srates[UAC_MAX_RATES]; /* available rates in Hz (0 terminated list) */
|
|
int c_ssize; /* sample size */
|
|
struct uac_fu_params c_fu; /* Feature Unit parameters */
|
|
|
|
/* rates are dynamic, in uac_rtd_params */
|
|
|
|
int req_number; /* number of preallocated requests */
|
|
int fb_max; /* upper frequency drift feedback limit per-mil */
|
|
};
|
|
|
|
struct g_audio {
|
|
struct usb_function func;
|
|
struct usb_gadget *gadget;
|
|
|
|
struct usb_ep *in_ep;
|
|
|
|
struct usb_ep *out_ep;
|
|
/* feedback IN endpoint corresponding to out_ep */
|
|
struct usb_ep *in_ep_fback;
|
|
|
|
/* Max packet size for all in_ep possible speeds */
|
|
unsigned int in_ep_maxpsize;
|
|
/* Max packet size for all out_ep possible speeds */
|
|
unsigned int out_ep_maxpsize;
|
|
|
|
/* Notify UAC driver about control change */
|
|
int (*notify)(struct g_audio *g_audio, int unit_id, int cs);
|
|
|
|
/* The ALSA Sound Card it represents on the USB-Client side */
|
|
struct snd_uac_chip *uac;
|
|
|
|
struct uac_params params;
|
|
};
|
|
|
|
static inline struct g_audio *func_to_g_audio(struct usb_function *f)
|
|
{
|
|
return container_of(f, struct g_audio, func);
|
|
}
|
|
|
|
static inline uint num_channels(uint chanmask)
|
|
{
|
|
uint num = 0;
|
|
|
|
while (chanmask) {
|
|
num += (chanmask & 1);
|
|
chanmask >>= 1;
|
|
}
|
|
|
|
return num;
|
|
}
|
|
|
|
/*
|
|
* g_audio_setup - initialize one virtual ALSA sound card
|
|
* @g_audio: struct with filled params, in_ep_maxpsize, out_ep_maxpsize
|
|
* @pcm_name: the id string for a PCM instance of this sound card
|
|
* @card_name: name of this soundcard
|
|
*
|
|
* This sets up the single virtual ALSA sound card that may be exported by a
|
|
* gadget driver using this framework.
|
|
*
|
|
* Context: may sleep
|
|
*
|
|
* Returns zero on success, or a negative error on failure.
|
|
*/
|
|
int g_audio_setup(struct g_audio *g_audio, const char *pcm_name,
|
|
const char *card_name);
|
|
void g_audio_cleanup(struct g_audio *g_audio);
|
|
|
|
int u_audio_start_capture(struct g_audio *g_audio);
|
|
void u_audio_stop_capture(struct g_audio *g_audio);
|
|
int u_audio_start_playback(struct g_audio *g_audio);
|
|
void u_audio_stop_playback(struct g_audio *g_audio);
|
|
|
|
int u_audio_get_capture_srate(struct g_audio *audio_dev, u32 *val);
|
|
int u_audio_set_capture_srate(struct g_audio *audio_dev, int srate);
|
|
int u_audio_get_playback_srate(struct g_audio *audio_dev, u32 *val);
|
|
int u_audio_set_playback_srate(struct g_audio *audio_dev, int srate);
|
|
|
|
int u_audio_get_volume(struct g_audio *g_audio, int playback, s16 *val);
|
|
int u_audio_set_volume(struct g_audio *g_audio, int playback, s16 val);
|
|
int u_audio_get_mute(struct g_audio *g_audio, int playback, int *val);
|
|
int u_audio_set_mute(struct g_audio *g_audio, int playback, int val);
|
|
|
|
void u_audio_suspend(struct g_audio *g_audio);
|
|
|
|
#endif /* __U_AUDIO_H */
|