usb: gadget: Gadget directory cleanup - group usb functions

The drivers/usb/gadget directory contains many files.
Files which are related can be distributed into separate directories.
This patch moves the USB functions implementations into a separate directory.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 0 insertions, 1354 deletions

diff --git a/drivers/usb/gadget/f_uac2.c b/drivers/usb/gadget/f_uac2.c
deleted file mode 100644
index 6261db4a9910..000000000000
--- a/drivers/usb/gadget/f_uac2.c
+++ /dev/null
@@ -1,1354 +0,0 @@
-/*
- * f_uac2.c -- USB Audio Class 2.0 Function
- *
- * Copyright (C) 2011
- *    Yadwinder Singh (yadi.brar01@gmail.com)
- *    Jaswinder Singh (jaswinder.singh@linaro.org)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-#include <linux/usb/audio.h>
-#include <linux/usb/audio-v2.h>
-#include <linux/platform_device.h>
-#include <linux/module.h>
-
-#include <sound/core.h>
-#include <sound/pcm.h>
-#include <sound/pcm_params.h>
-
-/* Playback(USB-IN) Default Stereo - Fl/Fr */
-static int p_chmask = 0x3;
-module_param(p_chmask, uint, S_IRUGO);
-MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");
-
-/* Playback Default 48 KHz */
-static int p_srate = 48000;
-module_param(p_srate, uint, S_IRUGO);
-MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");
-
-/* Playback Default 16bits/sample */
-static int p_ssize = 2;
-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 = 0x3;
-module_param(c_chmask, uint, S_IRUGO);
-MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");
-
-/* Capture Default 64 KHz */
-static int c_srate = 64000;
-module_param(c_srate, uint, S_IRUGO);
-MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
-
-/* Capture Default 16bits/sample */
-static int c_ssize = 2;
-module_param(c_ssize, uint, S_IRUGO);
-MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
-
-/* Keep everyone on toes */
-#define USB_XFERS	2
-
-/*
- * The driver implements a simple UAC_2 topology.
- * USB-OUT -> IT_1 -> OT_3 -> ALSA_Capture
- * ALSA_Playback -> IT_2 -> OT_4 -> USB-IN
- * Capture and Playback sampling rates are independently
- *  controlled by two clock sources :
- *    CLK_5 := c_srate, and CLK_6 := p_srate
- */
-#define USB_OUT_IT_ID	1
-#define IO_IN_IT_ID	2
-#define IO_OUT_OT_ID	3
-#define USB_IN_OT_ID	4
-#define USB_OUT_CLK_ID	5
-#define USB_IN_CLK_ID	6
-
-#define CONTROL_ABSENT	0
-#define CONTROL_RDONLY	1
-#define CONTROL_RDWR	3
-
-#define CLK_FREQ_CTRL	0
-#define CLK_VLD_CTRL	2
-
-#define COPY_CTRL	0
-#define CONN_CTRL	2
-#define OVRLD_CTRL	4
-#define CLSTR_CTRL	6
-#define UNFLW_CTRL	8
-#define OVFLW_CTRL	10
-
-const char *uac2_name = "snd_uac2";
-
-struct uac2_req {
-	struct uac2_rtd_params *pp; /* parent param */
-	struct usb_request *req;
-};
-
-struct uac2_rtd_params {
-	struct snd_uac2_chip *uac2; /* parent chip */
-	bool ep_enabled; /* if the ep is enabled */
-	/* Size of the ring buffer */
-	size_t dma_bytes;
-	unsigned char *dma_area;
-
-	struct snd_pcm_substream *ss;
-
-	/* Ring buffer */
-	ssize_t hw_ptr;
-
-	void *rbuf;
-
-	size_t period_size;
-
-	unsigned max_psize;
-	struct uac2_req ureq[USB_XFERS];
-
-	spinlock_t lock;
-};
-
-struct snd_uac2_chip {
-	struct platform_device pdev;
-	struct platform_driver pdrv;
-
-	struct uac2_rtd_params p_prm;
-	struct uac2_rtd_params c_prm;
-
-	struct snd_card *card;
-	struct snd_pcm *pcm;
-};
-
-#define BUFF_SIZE_MAX	(PAGE_SIZE * 16)
-#define PRD_SIZE_MAX	PAGE_SIZE
-#define MIN_PERIODS	4
-
-static struct snd_pcm_hardware uac2_pcm_hardware = {
-	.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER
-		 | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
-		 | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
-	.rates = SNDRV_PCM_RATE_CONTINUOUS,
-	.periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX,
-	.buffer_bytes_max = BUFF_SIZE_MAX,
-	.period_bytes_max = PRD_SIZE_MAX,
-	.periods_min = MIN_PERIODS,
-};
-
-struct audio_dev {
-	u8 ac_intf, ac_alt;
-	u8 as_out_intf, as_out_alt;
-	u8 as_in_intf, as_in_alt;
-
-	struct usb_ep *in_ep, *out_ep;
-	struct usb_function func;
-
-	/* The ALSA Sound Card it represents on the USB-Client side */
-	struct snd_uac2_chip uac2;
-};
-
-static struct audio_dev *agdev_g;
-
-static inline
-struct audio_dev *func_to_agdev(struct usb_function *f)
-{
-	return container_of(f, struct audio_dev, func);
-}
-
-static inline
-struct audio_dev *uac2_to_agdev(struct snd_uac2_chip *u)
-{
-	return container_of(u, struct audio_dev, uac2);
-}
-
-static inline
-struct snd_uac2_chip *pdev_to_uac2(struct platform_device *p)
-{
-	return container_of(p, struct snd_uac2_chip, pdev);
-}
-
-static inline
-uint num_channels(uint chanmask)
-{
-	uint num = 0;
-
-	while (chanmask) {
-		num += (chanmask & 1);
-		chanmask >>= 1;
-	}
-
-	return num;
-}
-
-static void
-agdev_iso_complete(struct usb_ep *ep, struct usb_request *req)
-{
-	unsigned pending;
-	unsigned long flags;
-	bool update_alsa = false;
-	unsigned char *src, *dst;
-	int status = req->status;
-	struct uac2_req *ur = req->context;
-	struct snd_pcm_substream *substream;
-	struct uac2_rtd_params *prm = ur->pp;
-	struct snd_uac2_chip *uac2 = prm->uac2;
-
-	/* i/f shutting down */
-	if (!prm->ep_enabled || req->status == -ESHUTDOWN)
-		return;
-
-	/*
-	 * We can't really do much about bad xfers.
-	 * Afterall, the ISOCH xfers could fail legitimately.
-	 */
-	if (status)
-		pr_debug("%s: iso_complete status(%d) %d/%d\n",
-			__func__, status, req->actual, req->length);
-
-	substream = prm->ss;
-
-	/* Do nothing if ALSA isn't active */
-	if (!substream)
-		goto exit;
-
-	spin_lock_irqsave(&prm->lock, flags);
-
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-		src = prm->dma_area + prm->hw_ptr;
-		req->actual = req->length;
-		dst = req->buf;
-	} else {
-		dst = prm->dma_area + prm->hw_ptr;
-		src = req->buf;
-	}
-
-	pending = prm->hw_ptr % prm->period_size;
-	pending += req->actual;
-	if (pending >= prm->period_size)
-		update_alsa = true;
-
-	prm->hw_ptr = (prm->hw_ptr + req->actual) % prm->dma_bytes;
-
-	spin_unlock_irqrestore(&prm->lock, flags);
-
-	/* Pack USB load in ALSA ring buffer */
-	memcpy(dst, src, req->actual);
-exit:
-	if (usb_ep_queue(ep, req, GFP_ATOMIC))
-		dev_err(&uac2->pdev.dev, "%d Error!\n", __LINE__);
-
-	if (update_alsa)
-		snd_pcm_period_elapsed(substream);
-
-	return;
-}
-
-static int
-uac2_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
-{
-	struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
-	struct uac2_rtd_params *prm;
-	unsigned long flags;
-	int err = 0;
-
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
-		prm = &uac2->p_prm;
-	else
-		prm = &uac2->c_prm;
-
-	spin_lock_irqsave(&prm->lock, flags);
-
-	/* Reset */
-	prm->hw_ptr = 0;
-
-	switch (cmd) {
-	case SNDRV_PCM_TRIGGER_START:
-	case SNDRV_PCM_TRIGGER_RESUME:
-		prm->ss = substream;
-		break;
-	case SNDRV_PCM_TRIGGER_STOP:
-	case SNDRV_PCM_TRIGGER_SUSPEND:
-		prm->ss = NULL;
-		break;
-	default:
-		err = -EINVAL;
-	}
-
-	spin_unlock_irqrestore(&prm->lock, flags);
-
-	/* Clear buffer after Play stops */
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss)
-		memset(prm->rbuf, 0, prm->max_psize * USB_XFERS);
-
-	return err;
-}
-
-static snd_pcm_uframes_t uac2_pcm_pointer(struct snd_pcm_substream *substream)
-{
-	struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
-	struct uac2_rtd_params *prm;
-
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
-		prm = &uac2->p_prm;
-	else
-		prm = &uac2->c_prm;
-
-	return bytes_to_frames(substream->runtime, prm->hw_ptr);
-}
-
-static int uac2_pcm_hw_params(struct snd_pcm_substream *substream,
-			       struct snd_pcm_hw_params *hw_params)
-{
-	struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
-	struct uac2_rtd_params *prm;
-	int err;
-
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
-		prm = &uac2->p_prm;
-	else
-		prm = &uac2->c_prm;
-
-	err = snd_pcm_lib_malloc_pages(substream,
-					params_buffer_bytes(hw_params));
-	if (err >= 0) {
-		prm->dma_bytes = substream->runtime->dma_bytes;
-		prm->dma_area = substream->runtime->dma_area;
-		prm->period_size = params_period_bytes(hw_params);
-	}
-
-	return err;
-}
-
-static int uac2_pcm_hw_free(struct snd_pcm_substream *substream)
-{
-	struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
-	struct uac2_rtd_params *prm;
-
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
-		prm = &uac2->p_prm;
-	else
-		prm = &uac2->c_prm;
-
-	prm->dma_area = NULL;
-	prm->dma_bytes = 0;
-	prm->period_size = 0;
-
-	return snd_pcm_lib_free_pages(substream);
-}
-
-static int uac2_pcm_open(struct snd_pcm_substream *substream)
-{
-	struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
-	struct snd_pcm_runtime *runtime = substream->runtime;
-
-	runtime->hw = uac2_pcm_hardware;
-
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-		spin_lock_init(&uac2->p_prm.lock);
-		runtime->hw.rate_min = p_srate;
-		runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE; /* ! p_ssize ! */
-		runtime->hw.channels_min = num_channels(p_chmask);
-		runtime->hw.period_bytes_min = 2 * uac2->p_prm.max_psize
-						/ runtime->hw.periods_min;
-	} else {
-		spin_lock_init(&uac2->c_prm.lock);
-		runtime->hw.rate_min = c_srate;
-		runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE; /* ! c_ssize ! */
-		runtime->hw.channels_min = num_channels(c_chmask);
-		runtime->hw.period_bytes_min = 2 * uac2->c_prm.max_psize
-						/ runtime->hw.periods_min;
-	}
-
-	runtime->hw.rate_max = runtime->hw.rate_min;
-	runtime->hw.channels_max = runtime->hw.channels_min;
-
-	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
-
-	return 0;
-}
-
-/* ALSA cries without these function pointers */
-static int uac2_pcm_null(struct snd_pcm_substream *substream)
-{
-	return 0;
-}
-
-static struct snd_pcm_ops uac2_pcm_ops = {
-	.open = uac2_pcm_open,
-	.close = uac2_pcm_null,
-	.ioctl = snd_pcm_lib_ioctl,
-	.hw_params = uac2_pcm_hw_params,
-	.hw_free = uac2_pcm_hw_free,
-	.trigger = uac2_pcm_trigger,
-	.pointer = uac2_pcm_pointer,
-	.prepare = uac2_pcm_null,
-};
-
-static int snd_uac2_probe(struct platform_device *pdev)
-{
-	struct snd_uac2_chip *uac2 = pdev_to_uac2(pdev);
-	struct snd_card *card;
-	struct snd_pcm *pcm;
-	int err;
-
-	/* Choose any slot, with no id */
-	err = snd_card_new(&pdev->dev, -1, NULL, THIS_MODULE, 0, &card);
-	if (err < 0)
-		return err;
-
-	uac2->card = card;
-
-	/*
-	 * Create first PCM device
-	 * Create a substream only for non-zero channel streams
-	 */
-	err = snd_pcm_new(uac2->card, "UAC2 PCM", 0,
-			       p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm);
-	if (err < 0)
-		goto snd_fail;
-
-	strcpy(pcm->name, "UAC2 PCM");
-	pcm->private_data = uac2;
-
-	uac2->pcm = pcm;
-
-	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac2_pcm_ops);
-	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac2_pcm_ops);
-
-	strcpy(card->driver, "UAC2_Gadget");
-	strcpy(card->shortname, "UAC2_Gadget");
-	sprintf(card->longname, "UAC2_Gadget %i", pdev->id);
-
-	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
-		snd_dma_continuous_data(GFP_KERNEL), 0, BUFF_SIZE_MAX);
-
-	err = snd_card_register(card);
-	if (!err) {
-		platform_set_drvdata(pdev, card);
-		return 0;
-	}
-
-snd_fail:
-	snd_card_free(card);
-
-	uac2->pcm = NULL;
-	uac2->card = NULL;
-
-	return err;
-}
-
-static int snd_uac2_remove(struct platform_device *pdev)
-{
-	struct snd_card *card = platform_get_drvdata(pdev);
-
-	if (card)
-		return snd_card_free(card);
-
-	return 0;
-}
-
-static int alsa_uac2_init(struct audio_dev *agdev)
-{
-	struct snd_uac2_chip *uac2 = &agdev->uac2;
-	int err;
-
-	uac2->pdrv.probe = snd_uac2_probe;
-	uac2->pdrv.remove = snd_uac2_remove;
-	uac2->pdrv.driver.name = uac2_name;
-
-	uac2->pdev.id = 0;
-	uac2->pdev.name = uac2_name;
-
-	/* Register snd_uac2 driver */
-	err = platform_driver_register(&uac2->pdrv);
-	if (err)
-		return err;
-
-	/* Register snd_uac2 device */
-	err = platform_device_register(&uac2->pdev);
-	if (err)
-		platform_driver_unregister(&uac2->pdrv);
-
-	return err;
-}
-
-static void alsa_uac2_exit(struct audio_dev *agdev)
-{
-	struct snd_uac2_chip *uac2 = &agdev->uac2;
-
-	platform_driver_unregister(&uac2->pdrv);
-	platform_device_unregister(&uac2->pdev);
-}
-
-
-/* --------- USB Function Interface ------------- */
-
-enum {
-	STR_ASSOC,
-	STR_IF_CTRL,
-	STR_CLKSRC_IN,
-	STR_CLKSRC_OUT,
-	STR_USB_IT,
-	STR_IO_IT,
-	STR_USB_OT,
-	STR_IO_OT,
-	STR_AS_OUT_ALT0,
-	STR_AS_OUT_ALT1,
-	STR_AS_IN_ALT0,
-	STR_AS_IN_ALT1,
-};
-
-static char clksrc_in[8];
-static char clksrc_out[8];
-
-static struct usb_string strings_fn[] = {
-	[STR_ASSOC].s = "Source/Sink",
-	[STR_IF_CTRL].s = "Topology Control",
-	[STR_CLKSRC_IN].s = clksrc_in,
-	[STR_CLKSRC_OUT].s = clksrc_out,
-	[STR_USB_IT].s = "USBH Out",
-	[STR_IO_IT].s = "USBD Out",
-	[STR_USB_OT].s = "USBH In",
-	[STR_IO_OT].s = "USBD In",
-	[STR_AS_OUT_ALT0].s = "Playback Inactive",
-	[STR_AS_OUT_ALT1].s = "Playback Active",
-	[STR_AS_IN_ALT0].s = "Capture Inactive",
-	[STR_AS_IN_ALT1].s = "Capture Active",
-	{ },
-};
-
-static struct usb_gadget_strings str_fn = {
-	.language = 0x0409,	/* en-us */
-	.strings = strings_fn,
-};
-
-static struct usb_gadget_strings *fn_strings[] = {
-	&str_fn,
-	NULL,
-};
-
-static struct usb_qualifier_descriptor devqual_desc = {
-	.bLength = sizeof devqual_desc,
-	.bDescriptorType = USB_DT_DEVICE_QUALIFIER,
-
-	.bcdUSB = cpu_to_le16(0x200),
-	.bDeviceClass = USB_CLASS_MISC,
-	.bDeviceSubClass = 0x02,
-	.bDeviceProtocol = 0x01,
-	.bNumConfigurations = 1,
-	.bRESERVED = 0,
-};
-
-static struct usb_interface_assoc_descriptor iad_desc = {
-	.bLength = sizeof iad_desc,
-	.bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
-
-	.bFirstInterface = 0,
-	.bInterfaceCount = 3,
-	.bFunctionClass = USB_CLASS_AUDIO,
-	.bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
-	.bFunctionProtocol = UAC_VERSION_2,
-};
-
-/* Audio Control Interface */
-static struct usb_interface_descriptor std_ac_if_desc = {
-	.bLength = sizeof std_ac_if_desc,
-	.bDescriptorType = USB_DT_INTERFACE,
-
-	.bAlternateSetting = 0,
-	.bNumEndpoints = 0,
-	.bInterfaceClass = USB_CLASS_AUDIO,
-	.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
-	.bInterfaceProtocol = UAC_VERSION_2,
-};
-
-/* Clock source for IN traffic */
-struct uac_clock_source_descriptor in_clk_src_desc = {
-	.bLength = sizeof in_clk_src_desc,
-	.bDescriptorType = USB_DT_CS_INTERFACE,
-
-	.bDescriptorSubtype = UAC2_CLOCK_SOURCE,
-	.bClockID = USB_IN_CLK_ID,
-	.bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
-	.bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
-	.bAssocTerminal = 0,
-};
-
-/* Clock source for OUT traffic */
-struct uac_clock_source_descriptor out_clk_src_desc = {
-	.bLength = sizeof out_clk_src_desc,
-	.bDescriptorType = USB_DT_CS_INTERFACE,
-
-	.bDescriptorSubtype = UAC2_CLOCK_SOURCE,
-	.bClockID = USB_OUT_CLK_ID,
-	.bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
-	.bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
-	.bAssocTerminal = 0,
-};
-
-/* Input Terminal for USB_OUT */
-struct uac2_input_terminal_descriptor usb_out_it_desc = {
-	.bLength = sizeof usb_out_it_desc,
-	.bDescriptorType = USB_DT_CS_INTERFACE,
-
-	.bDescriptorSubtype = UAC_INPUT_TERMINAL,
-	.bTerminalID = USB_OUT_IT_ID,
-	.wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
-	.bAssocTerminal = 0,
-	.bCSourceID = USB_OUT_CLK_ID,
-	.iChannelNames = 0,
-	.bmControls = (CONTROL_RDWR << COPY_CTRL),
-};
-
-/* Input Terminal for I/O-In */
-struct uac2_input_terminal_descriptor io_in_it_desc = {
-	.bLength = sizeof io_in_it_desc,
-	.bDescriptorType = USB_DT_CS_INTERFACE,
-
-	.bDescriptorSubtype = UAC_INPUT_TERMINAL,
-	.bTerminalID = IO_IN_IT_ID,
-	.wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED),
-	.bAssocTerminal = 0,
-	.bCSourceID = USB_IN_CLK_ID,
-	.iChannelNames = 0,
-	.bmControls = (CONTROL_RDWR << COPY_CTRL),
-};
-
-/* Ouput Terminal for USB_IN */
-struct uac2_output_terminal_descriptor usb_in_ot_desc = {
-	.bLength = sizeof usb_in_ot_desc,
-	.bDescriptorType = USB_DT_CS_INTERFACE,
-
-	.bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
-	.bTerminalID = USB_IN_OT_ID,
-	.wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
-	.bAssocTerminal = 0,
-	.bSourceID = IO_IN_IT_ID,
-	.bCSourceID = USB_IN_CLK_ID,
-	.bmControls = (CONTROL_RDWR << COPY_CTRL),
-};
-
-/* Ouput Terminal for I/O-Out */
-struct uac2_output_terminal_descriptor io_out_ot_desc = {
-	.bLength = sizeof io_out_ot_desc,
-	.bDescriptorType = USB_DT_CS_INTERFACE,
-
-	.bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
-	.bTerminalID = IO_OUT_OT_ID,
-	.wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED),
-	.bAssocTerminal = 0,
-	.bSourceID = USB_OUT_IT_ID,
-	.bCSourceID = USB_OUT_CLK_ID,
-	.bmControls = (CONTROL_RDWR << COPY_CTRL),
-};
-
-struct uac2_ac_header_descriptor ac_hdr_desc = {
-	.bLength = sizeof ac_hdr_desc,
-	.bDescriptorType = USB_DT_CS_INTERFACE,
-
-	.bDescriptorSubtype = UAC_MS_HEADER,
-	.bcdADC = cpu_to_le16(0x200),
-	.bCategory = UAC2_FUNCTION_IO_BOX,
-	.wTotalLength = sizeof in_clk_src_desc + sizeof out_clk_src_desc
-			 + sizeof usb_out_it_desc + sizeof io_in_it_desc
-			+ sizeof usb_in_ot_desc + sizeof io_out_ot_desc,
-	.bmControls = 0,
-};
-
-/* Audio Streaming OUT Interface - Alt0 */
-static struct usb_interface_descriptor std_as_out_if0_desc = {
-	.bLength = sizeof std_as_out_if0_desc,
-	.bDescriptorType = USB_DT_INTERFACE,
-
-	.bAlternateSetting = 0,
-	.bNumEndpoints = 0,
-	.bInterfaceClass = USB_CLASS_AUDIO,
-	.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
-	.bInterfaceProtocol = UAC_VERSION_2,
-};
-
-/* Audio Streaming OUT Interface - Alt1 */
-static struct usb_interface_descriptor std_as_out_if1_desc = {
-	.bLength = sizeof std_as_out_if1_desc,
-	.bDescriptorType = USB_DT_INTERFACE,
-
-	.bAlternateSetting = 1,
-	.bNumEndpoints = 1,
-	.bInterfaceClass = USB_CLASS_AUDIO,
-	.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
-	.bInterfaceProtocol = UAC_VERSION_2,
-};
-
-/* Audio Stream OUT Intface Desc */
-struct uac2_as_header_descriptor as_out_hdr_desc = {
-	.bLength = sizeof as_out_hdr_desc,
-	.bDescriptorType = USB_DT_CS_INTERFACE,
-
-	.bDescriptorSubtype = UAC_AS_GENERAL,
-	.bTerminalLink = USB_OUT_IT_ID,
-	.bmControls = 0,
-	.bFormatType = UAC_FORMAT_TYPE_I,
-	.bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
-	.iChannelNames = 0,
-};
-
-/* Audio USB_OUT Format */
-struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
-	.bLength = sizeof as_out_fmt1_desc,
-	.bDescriptorType = USB_DT_CS_INTERFACE,
-	.bDescriptorSubtype = UAC_FORMAT_TYPE,
-	.bFormatType = UAC_FORMAT_TYPE_I,
-};
-
-/* STD AS ISO OUT Endpoint */
-struct usb_endpoint_descriptor fs_epout_desc = {
-	.bLength = USB_DT_ENDPOINT_SIZE,
-	.bDescriptorType = USB_DT_ENDPOINT,
-
-	.bEndpointAddress = USB_DIR_OUT,
-	.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
-	.bInterval = 1,
-};
-
-struct usb_endpoint_descriptor hs_epout_desc = {
-	.bLength = USB_DT_ENDPOINT_SIZE,
-	.bDescriptorType = USB_DT_ENDPOINT,
-
-	.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
-	.bInterval = 4,
-};
-
-/* CS AS ISO OUT Endpoint */
-static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
-	.bLength = sizeof as_iso_out_desc,
-	.bDescriptorType = USB_DT_CS_ENDPOINT,
-
-	.bDescriptorSubtype = UAC_EP_GENERAL,
-	.bmAttributes = 0,
-	.bmControls = 0,
-	.bLockDelayUnits = 0,
-	.wLockDelay = 0,
-};
-
-/* Audio Streaming IN Interface - Alt0 */
-static struct usb_interface_descriptor std_as_in_if0_desc = {
-	.bLength = sizeof std_as_in_if0_desc,
-	.bDescriptorType = USB_DT_INTERFACE,
-
-	.bAlternateSetting = 0,
-	.bNumEndpoints = 0,
-	.bInterfaceClass = USB_CLASS_AUDIO,
-	.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
-	.bInterfaceProtocol = UAC_VERSION_2,
-};
-
-/* Audio Streaming IN Interface - Alt1 */
-static struct usb_interface_descriptor std_as_in_if1_desc = {
-	.bLength = sizeof std_as_in_if1_desc,
-	.bDescriptorType = USB_DT_INTERFACE,
-
-	.bAlternateSetting = 1,
-	.bNumEndpoints = 1,
-	.bInterfaceClass = USB_CLASS_AUDIO,
-	.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
-	.bInterfaceProtocol = UAC_VERSION_2,
-};
-
-/* Audio Stream IN Intface Desc */
-struct uac2_as_header_descriptor as_in_hdr_desc = {
-	.bLength = sizeof as_in_hdr_desc,
-	.bDescriptorType = USB_DT_CS_INTERFACE,
-
-	.bDescriptorSubtype = UAC_AS_GENERAL,
-	.bTerminalLink = USB_IN_OT_ID,
-	.bmControls = 0,
-	.bFormatType = UAC_FORMAT_TYPE_I,
-	.bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
-	.iChannelNames = 0,
-};
-
-/* Audio USB_IN Format */
-struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
-	.bLength = sizeof as_in_fmt1_desc,
-	.bDescriptorType = USB_DT_CS_INTERFACE,
-	.bDescriptorSubtype = UAC_FORMAT_TYPE,
-	.bFormatType = UAC_FORMAT_TYPE_I,
-};
-
-/* STD AS ISO IN Endpoint */
-struct usb_endpoint_descriptor fs_epin_desc = {
-	.bLength = USB_DT_ENDPOINT_SIZE,
-	.bDescriptorType = USB_DT_ENDPOINT,
-
-	.bEndpointAddress = USB_DIR_IN,
-	.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
-	.bInterval = 1,
-};
-
-struct usb_endpoint_descriptor hs_epin_desc = {
-	.bLength = USB_DT_ENDPOINT_SIZE,
-	.bDescriptorType = USB_DT_ENDPOINT,
-
-	.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
-	.bInterval = 4,
-};
-
-/* CS AS ISO IN Endpoint */
-static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
-	.bLength = sizeof as_iso_in_desc,
-	.bDescriptorType = USB_DT_CS_ENDPOINT,
-
-	.bDescriptorSubtype = UAC_EP_GENERAL,
-	.bmAttributes = 0,
-	.bmControls = 0,
-	.bLockDelayUnits = 0,
-	.wLockDelay = 0,
-};
-
-static struct usb_descriptor_header *fs_audio_desc[] = {
-	(struct usb_descriptor_header *)&iad_desc,
-	(struct usb_descriptor_header *)&std_ac_if_desc,
-
-	(struct usb_descriptor_header *)&ac_hdr_desc,
-	(struct usb_descriptor_header *)&in_clk_src_desc,
-	(struct usb_descriptor_header *)&out_clk_src_desc,
-	(struct usb_descriptor_header *)&usb_out_it_desc,
-	(struct usb_descriptor_header *)&io_in_it_desc,
-	(struct usb_descriptor_header *)&usb_in_ot_desc,
-	(struct usb_descriptor_header *)&io_out_ot_desc,
-
-	(struct usb_descriptor_header *)&std_as_out_if0_desc,
-	(struct usb_descriptor_header *)&std_as_out_if1_desc,
-
-	(struct usb_descriptor_header *)&as_out_hdr_desc,
-	(struct usb_descriptor_header *)&as_out_fmt1_desc,
-	(struct usb_descriptor_header *)&fs_epout_desc,
-	(struct usb_descriptor_header *)&as_iso_out_desc,
-
-	(struct usb_descriptor_header *)&std_as_in_if0_desc,
-	(struct usb_descriptor_header *)&std_as_in_if1_desc,
-
-	(struct usb_descriptor_header *)&as_in_hdr_desc,
-	(struct usb_descriptor_header *)&as_in_fmt1_desc,
-	(struct usb_descriptor_header *)&fs_epin_desc,
-	(struct usb_descriptor_header *)&as_iso_in_desc,
-	NULL,
-};
-
-static struct usb_descriptor_header *hs_audio_desc[] = {
-	(struct usb_descriptor_header *)&iad_desc,
-	(struct usb_descriptor_header *)&std_ac_if_desc,
-
-	(struct usb_descriptor_header *)&ac_hdr_desc,
-	(struct usb_descriptor_header *)&in_clk_src_desc,
-	(struct usb_descriptor_header *)&out_clk_src_desc,
-	(struct usb_descriptor_header *)&usb_out_it_desc,
-	(struct usb_descriptor_header *)&io_in_it_desc,
-	(struct usb_descriptor_header *)&usb_in_ot_desc,
-	(struct usb_descriptor_header *)&io_out_ot_desc,
-
-	(struct usb_descriptor_header *)&std_as_out_if0_desc,
-	(struct usb_descriptor_header *)&std_as_out_if1_desc,
-
-	(struct usb_descriptor_header *)&as_out_hdr_desc,
-	(struct usb_descriptor_header *)&as_out_fmt1_desc,
-	(struct usb_descriptor_header *)&hs_epout_desc,
-	(struct usb_descriptor_header *)&as_iso_out_desc,
-
-	(struct usb_descriptor_header *)&std_as_in_if0_desc,
-	(struct usb_descriptor_header *)&std_as_in_if1_desc,
-
-	(struct usb_descriptor_header *)&as_in_hdr_desc,
-	(struct usb_descriptor_header *)&as_in_fmt1_desc,
-	(struct usb_descriptor_header *)&hs_epin_desc,
-	(struct usb_descriptor_header *)&as_iso_in_desc,
-	NULL,
-};
-
-struct cntrl_cur_lay3 {
-	__u32	dCUR;
-};
-
-struct cntrl_range_lay3 {
-	__u16	wNumSubRanges;
-	__u32	dMIN;
-	__u32	dMAX;
-	__u32	dRES;
-} __packed;
-
-static inline void
-free_ep(struct uac2_rtd_params *prm, struct usb_ep *ep)
-{
-	struct snd_uac2_chip *uac2 = prm->uac2;
-	int i;
-
-	prm->ep_enabled = false;
-
-	for (i = 0; i < USB_XFERS; i++) {
-		if (prm->ureq[i].req) {
-			usb_ep_dequeue(ep, prm->ureq[i].req);
-			usb_ep_free_request(ep, prm->ureq[i].req);
-			prm->ureq[i].req = NULL;
-		}
-	}
-
-	if (usb_ep_disable(ep))
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
-}
-
-static int __init
-afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
-{
-	struct audio_dev *agdev = func_to_agdev(fn);
-	struct snd_uac2_chip *uac2 = &agdev->uac2;
-	struct usb_composite_dev *cdev = cfg->cdev;
-	struct usb_gadget *gadget = cdev->gadget;
-	struct uac2_rtd_params *prm;
-	int ret;
-
-	ret = usb_interface_id(cfg, fn);
-	if (ret < 0) {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
-		return ret;
-	}
-	std_ac_if_desc.bInterfaceNumber = ret;
-	agdev->ac_intf = ret;
-	agdev->ac_alt = 0;
-
-	ret = usb_interface_id(cfg, fn);
-	if (ret < 0) {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
-		return ret;
-	}
-	std_as_out_if0_desc.bInterfaceNumber = ret;
-	std_as_out_if1_desc.bInterfaceNumber = ret;
-	agdev->as_out_intf = ret;
-	agdev->as_out_alt = 0;
-
-	ret = usb_interface_id(cfg, fn);
-	if (ret < 0) {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
-		return ret;
-	}
-	std_as_in_if0_desc.bInterfaceNumber = ret;
-	std_as_in_if1_desc.bInterfaceNumber = ret;
-	agdev->as_in_intf = ret;
-	agdev->as_in_alt = 0;
-
-	agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
-	if (!agdev->out_ep) {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
-		goto err;
-	}
-	agdev->out_ep->driver_data = agdev;
-
-	agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
-	if (!agdev->in_ep) {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
-		goto err;
-	}
-	agdev->in_ep->driver_data = agdev;
-
-	uac2->p_prm.uac2 = uac2;
-	uac2->c_prm.uac2 = uac2;
-
-	hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
-	hs_epout_desc.wMaxPacketSize = fs_epout_desc.wMaxPacketSize;
-	hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
-	hs_epin_desc.wMaxPacketSize = fs_epin_desc.wMaxPacketSize;
-
-	ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, NULL);
-	if (ret)
-		goto err;
-
-	prm = &agdev->uac2.c_prm;
-	prm->max_psize = hs_epout_desc.wMaxPacketSize;
-	prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
-	if (!prm->rbuf) {
-		prm->max_psize = 0;
-		goto err;
-	}
-
-	prm = &agdev->uac2.p_prm;
-	prm->max_psize = hs_epin_desc.wMaxPacketSize;
-	prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
-	if (!prm->rbuf) {
-		prm->max_psize = 0;
-		goto err;
-	}
-
-	ret = alsa_uac2_init(agdev);
-	if (ret)
-		goto err;
-	return 0;
-err:
-	kfree(agdev->uac2.p_prm.rbuf);
-	kfree(agdev->uac2.c_prm.rbuf);
-	usb_free_all_descriptors(fn);
-	if (agdev->in_ep)
-		agdev->in_ep->driver_data = NULL;
-	if (agdev->out_ep)
-		agdev->out_ep->driver_data = NULL;
-	return -EINVAL;
-}
-
-static void
-afunc_unbind(struct usb_configuration *cfg, struct usb_function *fn)
-{
-	struct audio_dev *agdev = func_to_agdev(fn);
-	struct uac2_rtd_params *prm;
-
-	alsa_uac2_exit(agdev);
-
-	prm = &agdev->uac2.p_prm;
-	kfree(prm->rbuf);
-
-	prm = &agdev->uac2.c_prm;
-	kfree(prm->rbuf);
-	usb_free_all_descriptors(fn);
-
-	if (agdev->in_ep)
-		agdev->in_ep->driver_data = NULL;
-	if (agdev->out_ep)
-		agdev->out_ep->driver_data = NULL;
-}
-
-static int
-afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
-{
-	struct usb_composite_dev *cdev = fn->config->cdev;
-	struct audio_dev *agdev = func_to_agdev(fn);
-	struct snd_uac2_chip *uac2 = &agdev->uac2;
-	struct usb_gadget *gadget = cdev->gadget;
-	struct usb_request *req;
-	struct usb_ep *ep;
-	struct uac2_rtd_params *prm;
-	int i;
-
-	/* No i/f has more than 2 alt settings */
-	if (alt > 1) {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
-		return -EINVAL;
-	}
-
-	if (intf == agdev->ac_intf) {
-		/* Control I/f has only 1 AltSetting - 0 */
-		if (alt) {
-			dev_err(&uac2->pdev.dev,
-				"%s:%d Error!\n", __func__, __LINE__);
-			return -EINVAL;
-		}
-		return 0;
-	}
-
-	if (intf == agdev->as_out_intf) {
-		ep = agdev->out_ep;
-		prm = &uac2->c_prm;
-		config_ep_by_speed(gadget, fn, ep);
-		agdev->as_out_alt = alt;
-	} else if (intf == agdev->as_in_intf) {
-		ep = agdev->in_ep;
-		prm = &uac2->p_prm;
-		config_ep_by_speed(gadget, fn, ep);
-		agdev->as_in_alt = alt;
-	} else {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
-		return -EINVAL;
-	}
-
-	if (alt == 0) {
-		free_ep(prm, ep);
-		return 0;
-	}
-
-	prm->ep_enabled = true;
-	usb_ep_enable(ep);
-
-	for (i = 0; i < USB_XFERS; i++) {
-		if (prm->ureq[i].req) {
-			if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
-				dev_err(&uac2->pdev.dev, "%d Error!\n",
-					__LINE__);
-			continue;
-		}
-
-		req = usb_ep_alloc_request(ep, GFP_ATOMIC);
-		if (req == NULL) {
-			dev_err(&uac2->pdev.dev,
-				"%s:%d Error!\n", __func__, __LINE__);
-			return -EINVAL;
-		}
-
-		prm->ureq[i].req = req;
-		prm->ureq[i].pp = prm;
-
-		req->zero = 0;
-		req->context = &prm->ureq[i];
-		req->length = prm->max_psize;
-		req->complete =	agdev_iso_complete;
-		req->buf = prm->rbuf + i * req->length;
-
-		if (usb_ep_queue(ep, req, GFP_ATOMIC))
-			dev_err(&uac2->pdev.dev, "%d Error!\n", __LINE__);
-	}
-
-	return 0;
-}
-
-static int
-afunc_get_alt(struct usb_function *fn, unsigned intf)
-{
-	struct audio_dev *agdev = func_to_agdev(fn);
-	struct snd_uac2_chip *uac2 = &agdev->uac2;
-
-	if (intf == agdev->ac_intf)
-		return agdev->ac_alt;
-	else if (intf == agdev->as_out_intf)
-		return agdev->as_out_alt;
-	else if (intf == agdev->as_in_intf)
-		return agdev->as_in_alt;
-	else
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Invalid Interface %d!\n",
-			__func__, __LINE__, intf);
-
-	return -EINVAL;
-}
-
-static void
-afunc_disable(struct usb_function *fn)
-{
-	struct audio_dev *agdev = func_to_agdev(fn);
-	struct snd_uac2_chip *uac2 = &agdev->uac2;
-
-	free_ep(&uac2->p_prm, agdev->in_ep);
-	agdev->as_in_alt = 0;
-
-	free_ep(&uac2->c_prm, agdev->out_ep);
-	agdev->as_out_alt = 0;
-}
-
-static int
-in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
-{
-	struct usb_request *req = fn->config->cdev->req;
-	struct audio_dev *agdev = func_to_agdev(fn);
-	struct snd_uac2_chip *uac2 = &agdev->uac2;
-	u16 w_length = le16_to_cpu(cr->wLength);
-	u16 w_index = le16_to_cpu(cr->wIndex);
-	u16 w_value = le16_to_cpu(cr->wValue);
-	u8 entity_id = (w_index >> 8) & 0xff;
-	u8 control_selector = w_value >> 8;
-	int value = -EOPNOTSUPP;
-
-	if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
-		struct cntrl_cur_lay3 c;
-
-		if (entity_id == USB_IN_CLK_ID)
-			c.dCUR = p_srate;
-		else if (entity_id == USB_OUT_CLK_ID)
-			c.dCUR = c_srate;
-
-		value = min_t(unsigned, w_length, sizeof c);
-		memcpy(req->buf, &c, value);
-	} else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
-		*(u8 *)req->buf = 1;
-		value = min_t(unsigned, w_length, 1);
-	} else {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d control_selector=%d TODO!\n",
-			__func__, __LINE__, control_selector);
-	}
-
-	return value;
-}
-
-static int
-in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
-{
-	struct usb_request *req = fn->config->cdev->req;
-	struct audio_dev *agdev = func_to_agdev(fn);
-	struct snd_uac2_chip *uac2 = &agdev->uac2;
-	u16 w_length = le16_to_cpu(cr->wLength);
-	u16 w_index = le16_to_cpu(cr->wIndex);
-	u16 w_value = le16_to_cpu(cr->wValue);
-	u8 entity_id = (w_index >> 8) & 0xff;
-	u8 control_selector = w_value >> 8;
-	struct cntrl_range_lay3 r;
-	int value = -EOPNOTSUPP;
-
-	if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
-		if (entity_id == USB_IN_CLK_ID)
-			r.dMIN = p_srate;
-		else if (entity_id == USB_OUT_CLK_ID)
-			r.dMIN = c_srate;
-		else
-			return -EOPNOTSUPP;
-
-		r.dMAX = r.dMIN;
-		r.dRES = 0;
-		r.wNumSubRanges = 1;
-
-		value = min_t(unsigned, w_length, sizeof r);
-		memcpy(req->buf, &r, value);
-	} else {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d control_selector=%d TODO!\n",
-			__func__, __LINE__, control_selector);
-	}
-
-	return value;
-}
-
-static int
-ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
-{
-	if (cr->bRequest == UAC2_CS_CUR)
-		return in_rq_cur(fn, cr);
-	else if (cr->bRequest == UAC2_CS_RANGE)
-		return in_rq_range(fn, cr);
-	else
-		return -EOPNOTSUPP;
-}
-
-static int
-out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
-{
-	u16 w_length = le16_to_cpu(cr->wLength);
-	u16 w_value = le16_to_cpu(cr->wValue);
-	u8 control_selector = w_value >> 8;
-
-	if (control_selector == UAC2_CS_CONTROL_SAM_FREQ)
-		return w_length;
-
-	return -EOPNOTSUPP;
-}
-
-static int
-setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
-{
-	struct audio_dev *agdev = func_to_agdev(fn);
-	struct snd_uac2_chip *uac2 = &agdev->uac2;
-	u16 w_index = le16_to_cpu(cr->wIndex);
-	u8 intf = w_index & 0xff;
-
-	if (intf != agdev->ac_intf) {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
-		return -EOPNOTSUPP;
-	}
-
-	if (cr->bRequestType & USB_DIR_IN)
-		return ac_rq_in(fn, cr);
-	else if (cr->bRequest == UAC2_CS_CUR)
-		return out_rq_cur(fn, cr);
-
-	return -EOPNOTSUPP;
-}
-
-static int
-afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
-{
-	struct usb_composite_dev *cdev = fn->config->cdev;
-	struct audio_dev *agdev = func_to_agdev(fn);
-	struct snd_uac2_chip *uac2 = &agdev->uac2;
-	struct usb_request *req = cdev->req;
-	u16 w_length = le16_to_cpu(cr->wLength);
-	int value = -EOPNOTSUPP;
-
-	/* Only Class specific requests are supposed to reach here */
-	if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
-		return -EOPNOTSUPP;
-
-	if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
-		value = setup_rq_inf(fn, cr);
-	else
-		dev_err(&uac2->pdev.dev, "%s:%d Error!\n", __func__, __LINE__);
-
-	if (value >= 0) {
-		req->length = value;
-		req->zero = value < w_length;
-		value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
-		if (value < 0) {
-			dev_err(&uac2->pdev.dev,
-				"%s:%d Error!\n", __func__, __LINE__);
-			req->status = 0;
-		}
-	}
-
-	return value;
-}
-
-static int audio_bind_config(struct usb_configuration *cfg)
-{
-	int res;
-
-	agdev_g = kzalloc(sizeof *agdev_g, GFP_KERNEL);
-	if (agdev_g == NULL)
-		return -ENOMEM;
-
-	res = usb_string_ids_tab(cfg->cdev, strings_fn);
-	if (res)
-		return res;
-	iad_desc.iFunction = strings_fn[STR_ASSOC].id;
-	std_ac_if_desc.iInterface = strings_fn[STR_IF_CTRL].id;
-	in_clk_src_desc.iClockSource = strings_fn[STR_CLKSRC_IN].id;
-	out_clk_src_desc.iClockSource = strings_fn[STR_CLKSRC_OUT].id;
-	usb_out_it_desc.iTerminal = strings_fn[STR_USB_IT].id;
-	io_in_it_desc.iTerminal = strings_fn[STR_IO_IT].id;
-	usb_in_ot_desc.iTerminal = strings_fn[STR_USB_OT].id;
-	io_out_ot_desc.iTerminal = strings_fn[STR_IO_OT].id;
-	std_as_out_if0_desc.iInterface = strings_fn[STR_AS_OUT_ALT0].id;
-	std_as_out_if1_desc.iInterface = strings_fn[STR_AS_OUT_ALT1].id;
-	std_as_in_if0_desc.iInterface = strings_fn[STR_AS_IN_ALT0].id;
-	std_as_in_if1_desc.iInterface = strings_fn[STR_AS_IN_ALT1].id;
-
-	agdev_g->func.name = "uac2_func";
-	agdev_g->func.strings = fn_strings;
-	agdev_g->func.bind = afunc_bind;
-	agdev_g->func.unbind = afunc_unbind;
-	agdev_g->func.set_alt = afunc_set_alt;
-	agdev_g->func.get_alt = afunc_get_alt;
-	agdev_g->func.disable = afunc_disable;
-	agdev_g->func.setup = afunc_setup;
-
-	/* Initialize the configurable parameters */
-	usb_out_it_desc.bNrChannels = num_channels(c_chmask);
-	usb_out_it_desc.bmChannelConfig = cpu_to_le32(c_chmask);
-	io_in_it_desc.bNrChannels = num_channels(p_chmask);
-	io_in_it_desc.bmChannelConfig = cpu_to_le32(p_chmask);
-	as_out_hdr_desc.bNrChannels = num_channels(c_chmask);
-	as_out_hdr_desc.bmChannelConfig = cpu_to_le32(c_chmask);
-	as_in_hdr_desc.bNrChannels = num_channels(p_chmask);
-	as_in_hdr_desc.bmChannelConfig = cpu_to_le32(p_chmask);
-	as_out_fmt1_desc.bSubslotSize = c_ssize;
-	as_out_fmt1_desc.bBitResolution = c_ssize * 8;
-	as_in_fmt1_desc.bSubslotSize = p_ssize;
-	as_in_fmt1_desc.bBitResolution = p_ssize * 8;
-
-	snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", p_srate);
-	snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", c_srate);
-
-	res = usb_add_function(cfg, &agdev_g->func);
-	if (res < 0)
-		kfree(agdev_g);
-
-	return res;
-}
-
-static void
-uac2_unbind_config(struct usb_configuration *cfg)
-{
-	kfree(agdev_g);
-	agdev_g = NULL;
-}