drivers/usb/gadget/legacy/audio.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * audio.c -- Audio gadget driver
  *
  * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
  * 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		"Linux USB Audio Gadget"
 #define DRIVER_VERSION		"Feb 2, 2012"

 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, S_IRUGO);
 MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");

 /* Playback Default 48 KHz */
 static int p_srate = UAC2_DEF_PSRATE;
 module_param(p_srate, uint, S_IRUGO);
 MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");

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

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

 /* Capture Default 64 KHz */
 static int c_srate = UAC2_DEF_CSRATE;
 module_param(c_srate, uint, S_IRUGO);
 MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");

 /* Capture Default 16bits/sample */
 static int c_ssize = UAC2_DEF_CSSIZE;
 module_param(c_ssize, uint, S_IRUGO);
 MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
 #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, S_IRUGO);
 MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");

 /* Playback Default 48 KHz */
 static int p_srate = UAC1_DEF_PSRATE;
 module_param(p_srate, uint, S_IRUGO);
 MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");

 /* Playback Default 16bits/sample */
 static int p_ssize = UAC1_DEF_PSSIZE;
 module_param(p_ssize, uint, S_IRUGO);
 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, S_IRUGO);
 MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");

 /* Capture Default 48 KHz */
 static int c_srate = UAC1_DEF_CSRATE;
 module_param(c_srate, uint, S_IRUGO);
 MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");

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

 static char *fn_play = FILE_PCM_PLAYBACK;
 module_param(fn_play, charp, S_IRUGO);
 MODULE_PARM_DESC(fn_play, "Playback PCM device file name");

 static char *fn_cap = FILE_PCM_CAPTURE;
 module_param(fn_cap, charp, S_IRUGO);
 MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");

 static char *fn_cntl = FILE_CONTROL;
 module_param(fn_cntl, charp, S_IRUGO);
 MODULE_PARM_DESC(fn_cntl, "Control device file name");

 static int req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
 module_param(req_buf_size, int, S_IRUGO);
 MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");

 static int req_count = UAC1_REQ_COUNT;
 module_param(req_count, int, S_IRUGO);
 MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");

 static int audio_buf_size = UAC1_AUDIO_BUF_SIZE;
 module_param(audio_buf_size, int, S_IRUGO);
 MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
 #endif /* CONFIG_GADGET_UAC1_LEGACY */
 #endif

 /* string IDs are assigned dynamically */

 static struct usb_string strings_dev[] = {
 	[USB_GADGET_MANUFACTURER_IDX].s = "",
 	[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
 	[USB_GADGET_SERIAL_IDX].s = "",
 	{  } /* end of list */
 };

 static struct usb_gadget_strings stringtab_dev = {
 	.language = 0x0409,	/* en-us */
 	.strings = strings_dev,
 };

 static struct usb_gadget_strings *audio_strings[] = {
 	&stringtab_dev,
 	NULL,
 };

 #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		0x1d6b	/* Linux Foundation */
 #define AUDIO_PRODUCT_NUM		0x0101	/* Linux-USB Audio Gadget */

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

 static struct usb_device_descriptor device_desc = {
 	.bLength =		sizeof device_desc,
 	.bDescriptorType =	USB_DT_DEVICE,

 	/* .bcdUSB = DYNAMIC */

 #ifdef CONFIG_GADGET_UAC1_LEGACY
 	.bDeviceClass =		USB_CLASS_PER_INTERFACE,
 	.bDeviceSubClass =	0,
 	.bDeviceProtocol =	0,
 #else
 	.bDeviceClass =		USB_CLASS_MISC,
 	.bDeviceSubClass =	0x02,
 	.bDeviceProtocol =	0x01,
 #endif
 	/* .bMaxPacketSize0 = f(hardware) */

 	/* Vendor and product id defaults change according to what configs
 	 * we support.  (As does bNumConfigurations.)  These values can
 	 * also be overridden by module parameters.
 	 */
 	.idVendor =		cpu_to_le16(AUDIO_VENDOR_NUM),
 	.idProduct =		cpu_to_le16(AUDIO_PRODUCT_NUM),
 	/* .bcdDevice = f(hardware) */
 	/* .iManufacturer = DYNAMIC */
 	/* .iProduct = DYNAMIC */
 	/* NO SERIAL NUMBER */
 	.bNumConfigurations =	1,
 };

 static const struct usb_descriptor_header *otg_desc[2];

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

 static int audio_do_config(struct usb_configuration *c)
 {
 	int status;

 	/* FIXME alloc iConfiguration string, set it in c->strings */

 	if (gadget_is_otg(c->cdev->gadget)) {
 		c->descriptors = otg_desc;
 		c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 	}

 #ifdef CONFIG_GADGET_UAC1
 	f_uac1 = usb_get_function(fi_uac1);
 	if (IS_ERR(f_uac1)) {
 		status = PTR_ERR(f_uac1);
 		return status;
 	}

 	status = usb_add_function(c, f_uac1);
 	if (status < 0) {
 		usb_put_function(f_uac1);
 		return status;
 	}
 #else
 	f_uac2 = usb_get_function(fi_uac2);
 	if (IS_ERR(f_uac2)) {
 		status = PTR_ERR(f_uac2);
 		return status;
 	}

 	status = usb_add_function(c, f_uac2);
 	if (status < 0) {
 		usb_put_function(f_uac2);
 		return status;
 	}
 #endif

 	return 0;
 }

 static struct usb_configuration audio_config_driver = {
 	.label			= DRIVER_DESC,
 	.bConfigurationValue	= 1,
 	/* .iConfiguration = DYNAMIC */
 	.bmAttributes		= USB_CONFIG_ATT_SELFPOWER,
 };

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

 static int audio_bind(struct usb_composite_dev *cdev)
 {
 #ifndef CONFIG_GADGET_UAC1
 	struct f_uac2_opts	*uac2_opts;
 #else
 #ifndef CONFIG_GADGET_UAC1_LEGACY
 	struct f_uac1_opts	*uac1_opts;
 #else
 	struct f_uac1_legacy_opts	*uac1_opts;
 #endif
 #endif
 	int			status;

 #ifndef CONFIG_GADGET_UAC1
 	fi_uac2 = usb_get_function_instance("uac2");
 	if (IS_ERR(fi_uac2))
 		return PTR_ERR(fi_uac2);
 #else
 #ifndef CONFIG_GADGET_UAC1_LEGACY
 	fi_uac1 = usb_get_function_instance("uac1");
 #else
 	fi_uac1 = usb_get_function_instance("uac1_legacy");
 #endif
 	if (IS_ERR(fi_uac1))
 		return PTR_ERR(fi_uac1);
 #endif

 #ifndef CONFIG_GADGET_UAC1
 	uac2_opts = container_of(fi_uac2, struct f_uac2_opts, func_inst);
 	uac2_opts->p_chmask = p_chmask;
 	uac2_opts->p_srate = p_srate;
 	uac2_opts->p_ssize = p_ssize;
 	uac2_opts->c_chmask = c_chmask;
 	uac2_opts->c_srate = c_srate;
 	uac2_opts->c_ssize = c_ssize;
 	uac2_opts->req_number = UAC2_DEF_REQ_NUM;
 #else
 #ifndef CONFIG_GADGET_UAC1_LEGACY
 	uac1_opts = container_of(fi_uac1, struct f_uac1_opts, func_inst);
 	uac1_opts->p_chmask = p_chmask;
 	uac1_opts->p_srate = p_srate;
 	uac1_opts->p_ssize = p_ssize;
 	uac1_opts->c_chmask = c_chmask;
 	uac1_opts->c_srate = c_srate;
 	uac1_opts->c_ssize = c_ssize;
 	uac1_opts->req_number = UAC1_DEF_REQ_NUM;
 #else /* CONFIG_GADGET_UAC1_LEGACY */
 	uac1_opts = container_of(fi_uac1, struct f_uac1_legacy_opts, func_inst);
 	uac1_opts->fn_play = fn_play;
 	uac1_opts->fn_cap = fn_cap;
 	uac1_opts->fn_cntl = fn_cntl;
 	uac1_opts->req_buf_size = req_buf_size;
 	uac1_opts->req_count = req_count;
 	uac1_opts->audio_buf_size = audio_buf_size;
 #endif /* CONFIG_GADGET_UAC1_LEGACY */
 #endif

 	status = usb_string_ids_tab(cdev, strings_dev);
 	if (status < 0)
 		goto fail;
 	device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
 	device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;

 	if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) {
 		struct usb_descriptor_header *usb_desc;

 		usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
 		if (!usb_desc)
 			goto fail;
 		usb_otg_descriptor_init(cdev->gadget, usb_desc);
 		otg_desc[0] = usb_desc;
 		otg_desc[1] = NULL;
 	}

 	status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
 	if (status < 0)
 		goto fail_otg_desc;
 	usb_composite_overwrite_options(cdev, &coverwrite);

 	INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
 	return 0;

 fail_otg_desc:
 	kfree(otg_desc[0]);
 	otg_desc[0] = NULL;
 fail:
 #ifndef CONFIG_GADGET_UAC1
 	usb_put_function_instance(fi_uac2);
 #else
 	usb_put_function_instance(fi_uac1);
 #endif
 	return status;
 }

 static int audio_unbind(struct usb_composite_dev *cdev)
 {
 #ifdef CONFIG_GADGET_UAC1
 	if (!IS_ERR_OR_NULL(f_uac1))
 		usb_put_function(f_uac1);
 	if (!IS_ERR_OR_NULL(fi_uac1))
 		usb_put_function_instance(fi_uac1);
 #else
 	if (!IS_ERR_OR_NULL(f_uac2))
 		usb_put_function(f_uac2);
 	if (!IS_ERR_OR_NULL(fi_uac2))
 		usb_put_function_instance(fi_uac2);
 #endif
 	kfree(otg_desc[0]);
 	otg_desc[0] = NULL;

 	return 0;
 }

 static struct usb_composite_driver audio_driver = {
 	.name		= "g_audio",
 	.dev		= &device_desc,
 	.strings	= audio_strings,
 	.max_speed	= USB_SPEED_HIGH,
 	.bind		= audio_bind,
 	.unbind		= audio_unbind,
 };

 module_usb_composite_driver(audio_driver);

 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* audio.c -- Audio gadget driver
	*
	* Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
	* 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 "Linux USB Audio Gadget"
	#define DRIVER_VERSION "Feb 2, 2012"

	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, S_IRUGO);
	MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");

	/* Playback Default 48 KHz */
	static int p_srate = UAC2_DEF_PSRATE;
	module_param(p_srate, uint, S_IRUGO);
	MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");

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

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

	/* Capture Default 64 KHz */
	static int c_srate = UAC2_DEF_CSRATE;
	module_param(c_srate, uint, S_IRUGO);
	MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");

	/* Capture Default 16bits/sample */
	static int c_ssize = UAC2_DEF_CSSIZE;
	module_param(c_ssize, uint, S_IRUGO);
	MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
	#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, S_IRUGO);
	MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");

	/* Playback Default 48 KHz */
	static int p_srate = UAC1_DEF_PSRATE;
	module_param(p_srate, uint, S_IRUGO);
	MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");

	/* Playback Default 16bits/sample */
	static int p_ssize = UAC1_DEF_PSSIZE;
	module_param(p_ssize, uint, S_IRUGO);
	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, S_IRUGO);
	MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");

	/* Capture Default 48 KHz */
	static int c_srate = UAC1_DEF_CSRATE;
	module_param(c_srate, uint, S_IRUGO);
	MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");

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

	static char *fn_play = FILE_PCM_PLAYBACK;
	module_param(fn_play, charp, S_IRUGO);
	MODULE_PARM_DESC(fn_play, "Playback PCM device file name");

	static char *fn_cap = FILE_PCM_CAPTURE;
	module_param(fn_cap, charp, S_IRUGO);
	MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");

	static char *fn_cntl = FILE_CONTROL;
	module_param(fn_cntl, charp, S_IRUGO);
	MODULE_PARM_DESC(fn_cntl, "Control device file name");

	static int req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
	module_param(req_buf_size, int, S_IRUGO);
	MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");

	static int req_count = UAC1_REQ_COUNT;
	module_param(req_count, int, S_IRUGO);
	MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");

	static int audio_buf_size = UAC1_AUDIO_BUF_SIZE;
	module_param(audio_buf_size, int, S_IRUGO);
	MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
	#endif /* CONFIG_GADGET_UAC1_LEGACY */
	#endif

	/* string IDs are assigned dynamically */

	static struct usb_string strings_dev[] = {
	[USB_GADGET_MANUFACTURER_IDX].s = "",
	[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
	[USB_GADGET_SERIAL_IDX].s = "",
	{ } /* end of list */
	};

	static struct usb_gadget_strings stringtab_dev = {
	.language = 0x0409, /* en-us */
	.strings = strings_dev,
	};

	static struct usb_gadget_strings *audio_strings[] = {
	&stringtab_dev,
	NULL,
	};

	#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 0x1d6b /* Linux Foundation */
	#define AUDIO_PRODUCT_NUM 0x0101 /* Linux-USB Audio Gadget */

	/-------------------------------------------------------------------------/

	static struct usb_device_descriptor device_desc = {
	.bLength = sizeof device_desc,
	.bDescriptorType = USB_DT_DEVICE,

	/* .bcdUSB = DYNAMIC */

	#ifdef CONFIG_GADGET_UAC1_LEGACY
	.bDeviceClass = USB_CLASS_PER_INTERFACE,
	.bDeviceSubClass = 0,
	.bDeviceProtocol = 0,
	#else
	.bDeviceClass = USB_CLASS_MISC,
	.bDeviceSubClass = 0x02,
	.bDeviceProtocol = 0x01,
	#endif
	/* .bMaxPacketSize0 = f(hardware) */

	/* Vendor and product id defaults change according to what configs
	* we support. (As does bNumConfigurations.) These values can
	* also be overridden by module parameters.
	*/
	.idVendor = cpu_to_le16(AUDIO_VENDOR_NUM),
	.idProduct = cpu_to_le16(AUDIO_PRODUCT_NUM),
	/* .bcdDevice = f(hardware) */
	/* .iManufacturer = DYNAMIC */
	/* .iProduct = DYNAMIC */
	/* NO SERIAL NUMBER */
	.bNumConfigurations = 1,
	};

	static const struct usb_descriptor_header *otg_desc[2];

	/-------------------------------------------------------------------------/

	static int audio_do_config(struct usb_configuration *c)
	{
	int status;

	/* FIXME alloc iConfiguration string, set it in c->strings */

	if (gadget_is_otg(c->cdev->gadget)) {
	c->descriptors = otg_desc;
	c->bmAttributes \|= USB_CONFIG_ATT_WAKEUP;
	}

	#ifdef CONFIG_GADGET_UAC1
	f_uac1 = usb_get_function(fi_uac1);
	if (IS_ERR(f_uac1)) {
	status = PTR_ERR(f_uac1);
	return status;
	}

	status = usb_add_function(c, f_uac1);
	if (status < 0) {
	usb_put_function(f_uac1);
	return status;
	}
	#else
	f_uac2 = usb_get_function(fi_uac2);
	if (IS_ERR(f_uac2)) {
	status = PTR_ERR(f_uac2);
	return status;
	}

	status = usb_add_function(c, f_uac2);
	if (status < 0) {
	usb_put_function(f_uac2);
	return status;
	}
	#endif

	return 0;
	}

	static struct usb_configuration audio_config_driver = {
	.label = DRIVER_DESC,
	.bConfigurationValue = 1,
	/* .iConfiguration = DYNAMIC */
	.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
	};

	/-------------------------------------------------------------------------/

	static int audio_bind(struct usb_composite_dev *cdev)
	{
	#ifndef CONFIG_GADGET_UAC1
	struct f_uac2_opts *uac2_opts;
	#else
	#ifndef CONFIG_GADGET_UAC1_LEGACY
	struct f_uac1_opts *uac1_opts;
	#else
	struct f_uac1_legacy_opts *uac1_opts;
	#endif
	#endif
	int status;

	#ifndef CONFIG_GADGET_UAC1
	fi_uac2 = usb_get_function_instance("uac2");
	if (IS_ERR(fi_uac2))
	return PTR_ERR(fi_uac2);
	#else
	#ifndef CONFIG_GADGET_UAC1_LEGACY
	fi_uac1 = usb_get_function_instance("uac1");
	#else
	fi_uac1 = usb_get_function_instance("uac1_legacy");
	#endif
	if (IS_ERR(fi_uac1))
	return PTR_ERR(fi_uac1);
	#endif

	#ifndef CONFIG_GADGET_UAC1
	uac2_opts = container_of(fi_uac2, struct f_uac2_opts, func_inst);
	uac2_opts->p_chmask = p_chmask;
	uac2_opts->p_srate = p_srate;
	uac2_opts->p_ssize = p_ssize;
	uac2_opts->c_chmask = c_chmask;
	uac2_opts->c_srate = c_srate;
	uac2_opts->c_ssize = c_ssize;
	uac2_opts->req_number = UAC2_DEF_REQ_NUM;
	#else
	#ifndef CONFIG_GADGET_UAC1_LEGACY
	uac1_opts = container_of(fi_uac1, struct f_uac1_opts, func_inst);
	uac1_opts->p_chmask = p_chmask;
	uac1_opts->p_srate = p_srate;
	uac1_opts->p_ssize = p_ssize;
	uac1_opts->c_chmask = c_chmask;
	uac1_opts->c_srate = c_srate;
	uac1_opts->c_ssize = c_ssize;
	uac1_opts->req_number = UAC1_DEF_REQ_NUM;
	#else /* CONFIG_GADGET_UAC1_LEGACY */
	uac1_opts = container_of(fi_uac1, struct f_uac1_legacy_opts, func_inst);
	uac1_opts->fn_play = fn_play;
	uac1_opts->fn_cap = fn_cap;
	uac1_opts->fn_cntl = fn_cntl;
	uac1_opts->req_buf_size = req_buf_size;
	uac1_opts->req_count = req_count;
	uac1_opts->audio_buf_size = audio_buf_size;
	#endif /* CONFIG_GADGET_UAC1_LEGACY */
	#endif

	status = usb_string_ids_tab(cdev, strings_dev);
	if (status < 0)
	goto fail;
	device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
	device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;

	if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) {
	struct usb_descriptor_header *usb_desc;

	usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
	if (!usb_desc)
	goto fail;
	usb_otg_descriptor_init(cdev->gadget, usb_desc);
	otg_desc[0] = usb_desc;
	otg_desc[1] = NULL;
	}

	status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
	if (status < 0)
	goto fail_otg_desc;
	usb_composite_overwrite_options(cdev, &coverwrite);

	INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
	return 0;

	fail_otg_desc:
	kfree(otg_desc[0]);
	otg_desc[0] = NULL;
	fail:
	#ifndef CONFIG_GADGET_UAC1
	usb_put_function_instance(fi_uac2);
	#else
	usb_put_function_instance(fi_uac1);
	#endif
	return status;
	}

	static int audio_unbind(struct usb_composite_dev *cdev)
	{
	#ifdef CONFIG_GADGET_UAC1
	if (!IS_ERR_OR_NULL(f_uac1))
	usb_put_function(f_uac1);
	if (!IS_ERR_OR_NULL(fi_uac1))
	usb_put_function_instance(fi_uac1);
	#else
	if (!IS_ERR_OR_NULL(f_uac2))
	usb_put_function(f_uac2);
	if (!IS_ERR_OR_NULL(fi_uac2))
	usb_put_function_instance(fi_uac2);
	#endif
	kfree(otg_desc[0]);
	otg_desc[0] = NULL;

	return 0;
	}

	static struct usb_composite_driver audio_driver = {
	.name = "g_audio",
	.dev = &device_desc,
	.strings = audio_strings,
	.max_speed = USB_SPEED_HIGH,
	.bind = audio_bind,
	.unbind = audio_unbind,
	};

	module_usb_composite_driver(audio_driver);

	MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
	MODULE_LICENSE("GPL");