cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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u_audio.h (3974B)

      1/* SPDX-License-Identifier: GPL-2.0+ */
      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
      9#ifndef __U_AUDIO_H
     10#define __U_AUDIO_H
     11
     12#include <linux/usb/composite.h>
     13#include "uac_common.h"
     14
     15/*
     16 * Same maximum frequency deviation on the slower side as in
     17 * sound/usb/endpoint.c. Value is expressed in per-mil deviation.
     18 */
     19#define FBACK_SLOW_MAX	250
     20
     21/*
     22 * Maximum frequency deviation on the faster side, default value for UAC1/2.
     23 * Value is expressed in per-mil deviation.
     24 * UAC2 provides the value as a parameter as it impacts the endpoint required
     25 * bandwidth.
     26 */
     27#define FBACK_FAST_MAX 5
     28
     29/* Feature Unit parameters */
     30struct uac_fu_params {
     31	int id;			/* Feature Unit ID */
     32
     33	bool mute_present;	/* mute control enable */
     34
     35	bool volume_present;	/* volume control enable */
     36	s16 volume_min;		/* min volume in 1/256 dB */
     37	s16 volume_max;		/* max volume in 1/256 dB */
     38	s16 volume_res;		/* volume resolution in 1/256 dB */
     39};
     40
     41struct uac_params {
     42	/* playback */
     43	int p_chmask;	/* channel mask */
     44	int p_srates[UAC_MAX_RATES];	/* available rates in Hz (0 terminated list) */
     45	int p_ssize;	/* sample size */
     46	struct uac_fu_params p_fu;	/* Feature Unit parameters */
     47
     48	/* capture */
     49	int c_chmask;	/* channel mask */
     50	int c_srates[UAC_MAX_RATES];	/* available rates in Hz (0 terminated list) */
     51	int c_ssize;	/* sample size */
     52	struct uac_fu_params c_fu;	/* Feature Unit parameters */
     53
     54	/* rates are dynamic, in uac_rtd_params */
     55
     56	int req_number; /* number of preallocated requests */
     57	int fb_max;	/* upper frequency drift feedback limit per-mil */
     58};
     59
     60struct g_audio {
     61	struct usb_function func;
     62	struct usb_gadget *gadget;
     63
     64	struct usb_ep *in_ep;
     65
     66	struct usb_ep *out_ep;
     67	/* feedback IN endpoint corresponding to out_ep */
     68	struct usb_ep *in_ep_fback;
     69
     70	/* Max packet size for all in_ep possible speeds */
     71	unsigned int in_ep_maxpsize;
     72	/* Max packet size for all out_ep possible speeds */
     73	unsigned int out_ep_maxpsize;
     74
     75	/* Notify UAC driver about control change */
     76	int (*notify)(struct g_audio *g_audio, int unit_id, int cs);
     77
     78	/* The ALSA Sound Card it represents on the USB-Client side */
     79	struct snd_uac_chip *uac;
     80
     81	struct uac_params params;
     82};
     83
     84static inline struct g_audio *func_to_g_audio(struct usb_function *f)
     85{
     86	return container_of(f, struct g_audio, func);
     87}
     88
     89static inline uint num_channels(uint chanmask)
     90{
     91	uint num = 0;
     92
     93	while (chanmask) {
     94		num += (chanmask & 1);
     95		chanmask >>= 1;
     96	}
     97
     98	return num;
     99}
    100
    101/*
    102 * g_audio_setup - initialize one virtual ALSA sound card
    103 * @g_audio: struct with filled params, in_ep_maxpsize, out_ep_maxpsize
    104 * @pcm_name: the id string for a PCM instance of this sound card
    105 * @card_name: name of this soundcard
    106 *
    107 * This sets up the single virtual ALSA sound card that may be exported by a
    108 * gadget driver using this framework.
    109 *
    110 * Context: may sleep
    111 *
    112 * Returns zero on success, or a negative error on failure.
    113 */
    114int g_audio_setup(struct g_audio *g_audio, const char *pcm_name,
    115					const char *card_name);
    116void g_audio_cleanup(struct g_audio *g_audio);
    117
    118int u_audio_start_capture(struct g_audio *g_audio);
    119void u_audio_stop_capture(struct g_audio *g_audio);
    120int u_audio_start_playback(struct g_audio *g_audio);
    121void u_audio_stop_playback(struct g_audio *g_audio);
    122
    123int u_audio_get_capture_srate(struct g_audio *audio_dev, u32 *val);
    124int u_audio_set_capture_srate(struct g_audio *audio_dev, int srate);
    125int u_audio_get_playback_srate(struct g_audio *audio_dev, u32 *val);
    126int u_audio_set_playback_srate(struct g_audio *audio_dev, int srate);
    127
    128int u_audio_get_volume(struct g_audio *g_audio, int playback, s16 *val);
    129int u_audio_set_volume(struct g_audio *g_audio, int playback, s16 val);
    130int u_audio_get_mute(struct g_audio *g_audio, int playback, int *val);
    131int u_audio_set_mute(struct g_audio *g_audio, int playback, int val);
    132
    133void u_audio_suspend(struct g_audio *g_audio);
    134
    135#endif /* __U_AUDIO_H */