linux/drivers/usb/gadget/legacy/audio.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * audio.c -- Audio gadget driver
 *
 * Copyright (C) 2008 Bryan Wu <[email protected]>
 * Copyright (C) 2008 Analog Devices, Inc
 */

/* #define VERBOSE_DEBUG */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb/composite.h>

#define DRIVER_DESC …
#define DRIVER_VERSION …

USB_GADGET_COMPOSITE_OPTIONS(…);

#ifndef CONFIG_GADGET_UAC1
#include "u_uac2.h"

/* Playback(USB-IN) Default Stereo - Fl/Fr */
static int p_chmask = UAC2_DEF_PCHMASK;
module_param(p_chmask, uint, 0444);
MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");

/* Playback Default 48 KHz */
static int p_srates[UAC_MAX_RATES] = {UAC2_DEF_PSRATE};
static int p_srates_cnt = 1;
module_param_array_named(p_srate, p_srates, uint, &p_srates_cnt, 0444);
MODULE_PARM_DESC(p_srate, "Playback Sampling Rates (array)");

/* Playback Default 16bits/sample */
static int p_ssize = UAC2_DEF_PSSIZE;
module_param(p_ssize, uint, 0444);
MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");

/* Playback bInterval for HS/SS (1-4: fixed, 0: auto) */
static u8 p_hs_bint = UAC2_DEF_PHSBINT;
module_param(p_hs_bint, byte, 0444);
MODULE_PARM_DESC(p_hs_bint,
		"Playback bInterval for HS/SS (1-4: fixed, 0: auto)");

/* Capture(USB-OUT) Default Stereo - Fl/Fr */
static int c_chmask = UAC2_DEF_CCHMASK;
module_param(c_chmask, uint, 0444);
MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");

/* Capture Default 64 KHz */
static int c_srates[UAC_MAX_RATES] = {UAC2_DEF_CSRATE};
static int c_srates_cnt = 1;
module_param_array_named(c_srate, c_srates, uint, &c_srates_cnt, 0444);
MODULE_PARM_DESC(c_srate, "Capture Sampling Rates (array)");

/* Capture Default 16bits/sample */
static int c_ssize = UAC2_DEF_CSSIZE;
module_param(c_ssize, uint, 0444);
MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");

/* capture bInterval for HS/SS (1-4: fixed, 0: auto) */
static u8 c_hs_bint = UAC2_DEF_CHSBINT;
module_param(c_hs_bint, byte, 0444);
MODULE_PARM_DESC(c_hs_bint,
		"Capture bInterval for HS/SS (1-4: fixed, 0: auto)");

#else
#ifndef CONFIG_GADGET_UAC1_LEGACY
#include "u_uac1.h"

/* Playback(USB-IN) Default Stereo - Fl/Fr */
static int p_chmask = UAC1_DEF_PCHMASK;
module_param(p_chmask, uint, 0444);
MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");

/* Playback Default 48 KHz */
static int p_srates[UAC_MAX_RATES] = {UAC1_DEF_PSRATE};
static int p_srates_cnt = 1;
module_param_array_named(p_srate, p_srates, uint, &p_srates_cnt, 0444);
MODULE_PARM_DESC(p_srate, "Playback Sampling Rates (array)");

/* Playback Default 16bits/sample */
static int p_ssize = UAC1_DEF_PSSIZE;
module_param(p_ssize, uint, 0444);
MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");

/* Capture(USB-OUT) Default Stereo - Fl/Fr */
static int c_chmask = UAC1_DEF_CCHMASK;
module_param(c_chmask, uint, 0444);
MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");

/* Capture Default 48 KHz */
static int c_srates[UAC_MAX_RATES] = {UAC1_DEF_CSRATE};
static int c_srates_cnt = 1;
module_param_array_named(c_srate, c_srates, uint, &c_srates_cnt, 0444);
MODULE_PARM_DESC(c_srate, "Capture Sampling Rates (array)");

/* Capture Default 16bits/sample */
static int c_ssize = UAC1_DEF_CSSIZE;
module_param(c_ssize, uint, 0444);
MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
#else /* CONFIG_GADGET_UAC1_LEGACY */
#include "u_uac1_legacy.h"

static char *fn_play = …;
module_param(fn_play, charp, 0444);
MODULE_PARM_DESC(…) …;

static char *fn_cap = …;
module_param(fn_cap, charp, 0444);
MODULE_PARM_DESC(…) …;

static char *fn_cntl = …;
module_param(fn_cntl, charp, 0444);
MODULE_PARM_DESC(…) …;

static int req_buf_size = …;
module_param(req_buf_size, int, 0444);
MODULE_PARM_DESC(…) …;

static int req_count = …;
module_param(req_count, int, 0444);
MODULE_PARM_DESC(…) …;

static int audio_buf_size = …;
module_param(audio_buf_size, int, 0444);
MODULE_PARM_DESC(…) …;
#endif /* CONFIG_GADGET_UAC1_LEGACY */
#endif

/* string IDs are assigned dynamically */

static struct usb_string strings_dev[] = …;

static struct usb_gadget_strings stringtab_dev = …;

static struct usb_gadget_strings *audio_strings[] = …;

#ifndef CONFIG_GADGET_UAC1
static struct usb_function_instance *fi_uac2;
static struct usb_function *f_uac2;
#else
static struct usb_function_instance *fi_uac1;
static struct usb_function *f_uac1;
#endif

/*-------------------------------------------------------------------------*/

/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 * Instead:  allocate your own, using normal USB-IF procedures.
 */

/* Thanks to Linux Foundation for donating this product ID. */
#define AUDIO_VENDOR_NUM …
#define AUDIO_PRODUCT_NUM …

/*-------------------------------------------------------------------------*/

static struct usb_device_descriptor device_desc = …;

static const struct usb_descriptor_header *otg_desc[2];

/*-------------------------------------------------------------------------*/

static int audio_do_config(struct usb_configuration *c)
{ … }

static struct usb_configuration audio_config_driver = …;

/*-------------------------------------------------------------------------*/

static int audio_bind(struct usb_composite_dev *cdev)
{ … }

static int audio_unbind(struct usb_composite_dev *cdev)
{ … }

static struct usb_composite_driver audio_driver = …;

module_usb_composite_driver(…);

MODULE_DESCRIPTION(…);
MODULE_AUTHOR(…) …;
MODULE_LICENSE(…) …;