usb: gadget: Rename audio function to uac1

The extant USB-Audio function driver complies to UAC_1 spec.
So name the files accordingly, paving way for inclusion of
a new UAC_2 specified driver.

Signed-off-by: Yadi Brar <yadi.brar01@gmail.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 0 insertions, 799 deletions

diff --git a/drivers/usb/gadget/f_audio.c b/drivers/usb/gadget/f_audio.c
deleted file mode 100644
index ec7ffcd0d0cd..000000000000
--- a/drivers/usb/gadget/f_audio.c
+++ /dev/null
@@ -1,799 +0,0 @@
-/*
- * f_audio.c -- USB Audio class function driver
-  *
- * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
- * Copyright (C) 2008 Analog Devices, Inc
- *
- * Enter bugs at http://blackfin.uclinux.org/
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/slab.h>
-#include <linux/kernel.h>
-#include <linux/device.h>
-#include <linux/atomic.h>
-
-#include "u_audio.h"
-
-#define OUT_EP_MAX_PACKET_SIZE	200
-static int req_buf_size = 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 = 256;
-module_param(req_count, int, S_IRUGO);
-MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
-
-static int audio_buf_size = 48000;
-module_param(audio_buf_size, int, S_IRUGO);
-MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
-
-static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
-static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
-
-/*
- * DESCRIPTORS ... most are static, but strings and full
- * configuration descriptors are built on demand.
- */
-
-/*
- * We have two interfaces- AudioControl and AudioStreaming
- * TODO: only supcard playback currently
- */
-#define F_AUDIO_AC_INTERFACE	0
-#define F_AUDIO_AS_INTERFACE	1
-#define F_AUDIO_NUM_INTERFACES	2
-
-/* B.3.1  Standard AC Interface Descriptor */
-static struct usb_interface_descriptor ac_interface_desc __initdata = {
-	.bLength =		USB_DT_INTERFACE_SIZE,
-	.bDescriptorType =	USB_DT_INTERFACE,
-	.bNumEndpoints =	0,
-	.bInterfaceClass =	USB_CLASS_AUDIO,
-	.bInterfaceSubClass =	USB_SUBCLASS_AUDIOCONTROL,
-};
-
-DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
-
-#define UAC_DT_AC_HEADER_LENGTH	UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
-/* 1 input terminal, 1 output terminal and 1 feature unit */
-#define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \
-	+ UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0))
-/* B.3.2  Class-Specific AC Interface Descriptor */
-static struct uac1_ac_header_descriptor_2 ac_header_desc = {
-	.bLength =		UAC_DT_AC_HEADER_LENGTH,
-	.bDescriptorType =	USB_DT_CS_INTERFACE,
-	.bDescriptorSubtype =	UAC_HEADER,
-	.bcdADC =		__constant_cpu_to_le16(0x0100),
-	.wTotalLength =		__constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH),
-	.bInCollection =	F_AUDIO_NUM_INTERFACES,
-	.baInterfaceNr = {
-		[0] =		F_AUDIO_AC_INTERFACE,
-		[1] =		F_AUDIO_AS_INTERFACE,
-	}
-};
-
-#define INPUT_TERMINAL_ID	1
-static struct uac_input_terminal_descriptor input_terminal_desc = {
-	.bLength =		UAC_DT_INPUT_TERMINAL_SIZE,
-	.bDescriptorType =	USB_DT_CS_INTERFACE,
-	.bDescriptorSubtype =	UAC_INPUT_TERMINAL,
-	.bTerminalID =		INPUT_TERMINAL_ID,
-	.wTerminalType =	UAC_TERMINAL_STREAMING,
-	.bAssocTerminal =	0,
-	.wChannelConfig =	0x3,
-};
-
-DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
-
-#define FEATURE_UNIT_ID		2
-static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
-	.bLength		= UAC_DT_FEATURE_UNIT_SIZE(0),
-	.bDescriptorType	= USB_DT_CS_INTERFACE,
-	.bDescriptorSubtype	= UAC_FEATURE_UNIT,
-	.bUnitID		= FEATURE_UNIT_ID,
-	.bSourceID		= INPUT_TERMINAL_ID,
-	.bControlSize		= 2,
-	.bmaControls[0]		= (UAC_FU_MUTE | UAC_FU_VOLUME),
-};
-
-static struct usb_audio_control mute_control = {
-	.list = LIST_HEAD_INIT(mute_control.list),
-	.name = "Mute Control",
-	.type = UAC_FU_MUTE,
-	/* Todo: add real Mute control code */
-	.set = generic_set_cmd,
-	.get = generic_get_cmd,
-};
-
-static struct usb_audio_control volume_control = {
-	.list = LIST_HEAD_INIT(volume_control.list),
-	.name = "Volume Control",
-	.type = UAC_FU_VOLUME,
-	/* Todo: add real Volume control code */
-	.set = generic_set_cmd,
-	.get = generic_get_cmd,
-};
-
-static struct usb_audio_control_selector feature_unit = {
-	.list = LIST_HEAD_INIT(feature_unit.list),
-	.id = FEATURE_UNIT_ID,
-	.name = "Mute & Volume Control",
-	.type = UAC_FEATURE_UNIT,
-	.desc = (struct usb_descriptor_header *)&feature_unit_desc,
-};
-
-#define OUTPUT_TERMINAL_ID	3
-static struct uac1_output_terminal_descriptor output_terminal_desc = {
-	.bLength		= UAC_DT_OUTPUT_TERMINAL_SIZE,
-	.bDescriptorType	= USB_DT_CS_INTERFACE,
-	.bDescriptorSubtype	= UAC_OUTPUT_TERMINAL,
-	.bTerminalID		= OUTPUT_TERMINAL_ID,
-	.wTerminalType		= UAC_OUTPUT_TERMINAL_SPEAKER,
-	.bAssocTerminal		= FEATURE_UNIT_ID,
-	.bSourceID		= FEATURE_UNIT_ID,
-};
-
-/* B.4.1  Standard AS Interface Descriptor */
-static struct usb_interface_descriptor as_interface_alt_0_desc = {
-	.bLength =		USB_DT_INTERFACE_SIZE,
-	.bDescriptorType =	USB_DT_INTERFACE,
-	.bAlternateSetting =	0,
-	.bNumEndpoints =	0,
-	.bInterfaceClass =	USB_CLASS_AUDIO,
-	.bInterfaceSubClass =	USB_SUBCLASS_AUDIOSTREAMING,
-};
-
-static struct usb_interface_descriptor as_interface_alt_1_desc = {
-	.bLength =		USB_DT_INTERFACE_SIZE,
-	.bDescriptorType =	USB_DT_INTERFACE,
-	.bAlternateSetting =	1,
-	.bNumEndpoints =	1,
-	.bInterfaceClass =	USB_CLASS_AUDIO,
-	.bInterfaceSubClass =	USB_SUBCLASS_AUDIOSTREAMING,
-};
-
-/* B.4.2  Class-Specific AS Interface Descriptor */
-static struct uac1_as_header_descriptor as_header_desc = {
-	.bLength =		UAC_DT_AS_HEADER_SIZE,
-	.bDescriptorType =	USB_DT_CS_INTERFACE,
-	.bDescriptorSubtype =	UAC_AS_GENERAL,
-	.bTerminalLink =	INPUT_TERMINAL_ID,
-	.bDelay =		1,
-	.wFormatTag =		UAC_FORMAT_TYPE_I_PCM,
-};
-
-DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
-
-static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
-	.bLength =		UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
-	.bDescriptorType =	USB_DT_CS_INTERFACE,
-	.bDescriptorSubtype =	UAC_FORMAT_TYPE,
-	.bFormatType =		UAC_FORMAT_TYPE_I,
-	.bSubframeSize =	2,
-	.bBitResolution =	16,
-	.bSamFreqType =		1,
-};
-
-/* Standard ISO OUT Endpoint Descriptor */
-static struct usb_endpoint_descriptor as_out_ep_desc  = {
-	.bLength =		USB_DT_ENDPOINT_AUDIO_SIZE,
-	.bDescriptorType =	USB_DT_ENDPOINT,
-	.bEndpointAddress =	USB_DIR_OUT,
-	.bmAttributes =		USB_ENDPOINT_SYNC_ADAPTIVE
-				| USB_ENDPOINT_XFER_ISOC,
-	.wMaxPacketSize =	__constant_cpu_to_le16(OUT_EP_MAX_PACKET_SIZE),
-	.bInterval =		4,
-};
-
-/* Class-specific AS ISO OUT Endpoint Descriptor */
-static struct uac_iso_endpoint_descriptor as_iso_out_desc __initdata = {
-	.bLength =		UAC_ISO_ENDPOINT_DESC_SIZE,
-	.bDescriptorType =	USB_DT_CS_ENDPOINT,
-	.bDescriptorSubtype =	UAC_EP_GENERAL,
-	.bmAttributes = 	1,
-	.bLockDelayUnits =	1,
-	.wLockDelay =		__constant_cpu_to_le16(1),
-};
-
-static struct usb_descriptor_header *f_audio_desc[] __initdata = {
-	(struct usb_descriptor_header *)&ac_interface_desc,
-	(struct usb_descriptor_header *)&ac_header_desc,
-
-	(struct usb_descriptor_header *)&input_terminal_desc,
-	(struct usb_descriptor_header *)&output_terminal_desc,
-	(struct usb_descriptor_header *)&feature_unit_desc,
-
-	(struct usb_descriptor_header *)&as_interface_alt_0_desc,
-	(struct usb_descriptor_header *)&as_interface_alt_1_desc,
-	(struct usb_descriptor_header *)&as_header_desc,
-
-	(struct usb_descriptor_header *)&as_type_i_desc,
-
-	(struct usb_descriptor_header *)&as_out_ep_desc,
-	(struct usb_descriptor_header *)&as_iso_out_desc,
-	NULL,
-};
-
-/* string IDs are assigned dynamically */
-
-#define STRING_MANUFACTURER_IDX		0
-#define STRING_PRODUCT_IDX		1
-
-static char manufacturer[50];
-
-static struct usb_string strings_dev[] = {
-	[STRING_MANUFACTURER_IDX].s = manufacturer,
-	[STRING_PRODUCT_IDX].s = DRIVER_DESC,
-	{  } /* 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,
-};
-
-/*
- * This function is an ALSA sound card following USB Audio Class Spec 1.0.
- */
-
-/*-------------------------------------------------------------------------*/
-struct f_audio_buf {
-	u8 *buf;
-	int actual;
-	struct list_head list;
-};
-
-static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
-{
-	struct f_audio_buf *copy_buf;
-
-	copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC);
-	if (!copy_buf)
-		return ERR_PTR(-ENOMEM);
-
-	copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
-	if (!copy_buf->buf) {
-		kfree(copy_buf);
-		return ERR_PTR(-ENOMEM);
-	}
-
-	return copy_buf;
-}
-
-static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
-{
-	kfree(audio_buf->buf);
-	kfree(audio_buf);
-}
-/*-------------------------------------------------------------------------*/
-
-struct f_audio {
-	struct gaudio			card;
-
-	/* endpoints handle full and/or high speeds */
-	struct usb_ep			*out_ep;
-
-	spinlock_t			lock;
-	struct f_audio_buf *copy_buf;
-	struct work_struct playback_work;
-	struct list_head play_queue;
-
-	/* Control Set command */
-	struct list_head cs;
-	u8 set_cmd;
-	struct usb_audio_control *set_con;
-};
-
-static inline struct f_audio *func_to_audio(struct usb_function *f)
-{
-	return container_of(f, struct f_audio, card.func);
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void f_audio_playback_work(struct work_struct *data)
-{
-	struct f_audio *audio = container_of(data, struct f_audio,
-					playback_work);
-	struct f_audio_buf *play_buf;
-
-	spin_lock_irq(&audio->lock);
-	if (list_empty(&audio->play_queue)) {
-		spin_unlock_irq(&audio->lock);
-		return;
-	}
-	play_buf = list_first_entry(&audio->play_queue,
-			struct f_audio_buf, list);
-	list_del(&play_buf->list);
-	spin_unlock_irq(&audio->lock);
-
-	u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
-	f_audio_buffer_free(play_buf);
-}
-
-static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
-{
-	struct f_audio *audio = req->context;
-	struct usb_composite_dev *cdev = audio->card.func.config->cdev;
-	struct f_audio_buf *copy_buf = audio->copy_buf;
-	int err;
-
-	if (!copy_buf)
-		return -EINVAL;
-
-	/* Copy buffer is full, add it to the play_queue */
-	if (audio_buf_size - copy_buf->actual < req->actual) {
-		list_add_tail(&copy_buf->list, &audio->play_queue);
-		schedule_work(&audio->playback_work);
-		copy_buf = f_audio_buffer_alloc(audio_buf_size);
-		if (IS_ERR(copy_buf))
-			return -ENOMEM;
-	}
-
-	memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
-	copy_buf->actual += req->actual;
-	audio->copy_buf = copy_buf;
-
-	err = usb_ep_queue(ep, req, GFP_ATOMIC);
-	if (err)
-		ERROR(cdev, "%s queue req: %d\n", ep->name, err);
-
-	return 0;
-
-}
-
-static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
-{
-	struct f_audio *audio = req->context;
-	int status = req->status;
-	u32 data = 0;
-	struct usb_ep *out_ep = audio->out_ep;
-
-	switch (status) {
-
-	case 0:				/* normal completion? */
-		if (ep == out_ep)
-			f_audio_out_ep_complete(ep, req);
-		else if (audio->set_con) {
-			memcpy(&data, req->buf, req->length);
-			audio->set_con->set(audio->set_con, audio->set_cmd,
-					le16_to_cpu(data));
-			audio->set_con = NULL;
-		}
-		break;
-	default:
-		break;
-	}
-}
-
-static int audio_set_intf_req(struct usb_function *f,
-		const struct usb_ctrlrequest *ctrl)
-{
-	struct f_audio		*audio = func_to_audio(f);
-	struct usb_composite_dev *cdev = f->config->cdev;
-	struct usb_request	*req = cdev->req;
-	u8			id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
-	u16			len = le16_to_cpu(ctrl->wLength);
-	u16			w_value = le16_to_cpu(ctrl->wValue);
-	u8			con_sel = (w_value >> 8) & 0xFF;
-	u8			cmd = (ctrl->bRequest & 0x0F);
-	struct usb_audio_control_selector *cs;
-	struct usb_audio_control *con;
-
-	DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
-			ctrl->bRequest, w_value, len, id);
-
-	list_for_each_entry(cs, &audio->cs, list) {
-		if (cs->id == id) {
-			list_for_each_entry(con, &cs->control, list) {
-				if (con->type == con_sel) {
-					audio->set_con = con;
-					break;
-				}
-			}
-			break;
-		}
-	}
-
-	audio->set_cmd = cmd;
-	req->context = audio;
-	req->complete = f_audio_complete;
-
-	return len;
-}
-
-static int audio_get_intf_req(struct usb_function *f,
-		const struct usb_ctrlrequest *ctrl)
-{
-	struct f_audio		*audio = func_to_audio(f);
-	struct usb_composite_dev *cdev = f->config->cdev;
-	struct usb_request	*req = cdev->req;
-	int			value = -EOPNOTSUPP;
-	u8			id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
-	u16			len = le16_to_cpu(ctrl->wLength);
-	u16			w_value = le16_to_cpu(ctrl->wValue);
-	u8			con_sel = (w_value >> 8) & 0xFF;
-	u8			cmd = (ctrl->bRequest & 0x0F);
-	struct usb_audio_control_selector *cs;
-	struct usb_audio_control *con;
-
-	DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
-			ctrl->bRequest, w_value, len, id);
-
-	list_for_each_entry(cs, &audio->cs, list) {
-		if (cs->id == id) {
-			list_for_each_entry(con, &cs->control, list) {
-				if (con->type == con_sel && con->get) {
-					value = con->get(con, cmd);
-					break;
-				}
-			}
-			break;
-		}
-	}
-
-	req->context = audio;
-	req->complete = f_audio_complete;
-	memcpy(req->buf, &value, len);
-
-	return len;
-}
-
-static int audio_set_endpoint_req(struct usb_function *f,
-		const struct usb_ctrlrequest *ctrl)
-{
-	struct usb_composite_dev *cdev = f->config->cdev;
-	int			value = -EOPNOTSUPP;
-	u16			ep = le16_to_cpu(ctrl->wIndex);
-	u16			len = le16_to_cpu(ctrl->wLength);
-	u16			w_value = le16_to_cpu(ctrl->wValue);
-
-	DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
-			ctrl->bRequest, w_value, len, ep);
-
-	switch (ctrl->bRequest) {
-	case UAC_SET_CUR:
-		value = len;
-		break;
-
-	case UAC_SET_MIN:
-		break;
-
-	case UAC_SET_MAX:
-		break;
-
-	case UAC_SET_RES:
-		break;
-
-	case UAC_SET_MEM:
-		break;
-
-	default:
-		break;
-	}
-
-	return value;
-}
-
-static int audio_get_endpoint_req(struct usb_function *f,
-		const struct usb_ctrlrequest *ctrl)
-{
-	struct usb_composite_dev *cdev = f->config->cdev;
-	int value = -EOPNOTSUPP;
-	u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
-	u16 len = le16_to_cpu(ctrl->wLength);
-	u16 w_value = le16_to_cpu(ctrl->wValue);
-
-	DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
-			ctrl->bRequest, w_value, len, ep);
-
-	switch (ctrl->bRequest) {
-	case UAC_GET_CUR:
-	case UAC_GET_MIN:
-	case UAC_GET_MAX:
-	case UAC_GET_RES:
-		value = len;
-		break;
-	case UAC_GET_MEM:
-		break;
-	default:
-		break;
-	}
-
-	return value;
-}
-
-static int
-f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
-{
-	struct usb_composite_dev *cdev = f->config->cdev;
-	struct usb_request	*req = cdev->req;
-	int			value = -EOPNOTSUPP;
-	u16			w_index = le16_to_cpu(ctrl->wIndex);
-	u16			w_value = le16_to_cpu(ctrl->wValue);
-	u16			w_length = le16_to_cpu(ctrl->wLength);
-
-	/* composite driver infrastructure handles everything; interface
-	 * activation uses set_alt().
-	 */
-	switch (ctrl->bRequestType) {
-	case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
-		value = audio_set_intf_req(f, ctrl);
-		break;
-
-	case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
-		value = audio_get_intf_req(f, ctrl);
-		break;
-
-	case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
-		value = audio_set_endpoint_req(f, ctrl);
-		break;
-
-	case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
-		value = audio_get_endpoint_req(f, ctrl);
-		break;
-
-	default:
-		ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
-			ctrl->bRequestType, ctrl->bRequest,
-			w_value, w_index, w_length);
-	}
-
-	/* respond with data transfer or status phase? */
-	if (value >= 0) {
-		DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
-			ctrl->bRequestType, ctrl->bRequest,
-			w_value, w_index, w_length);
-		req->zero = 0;
-		req->length = value;
-		value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
-		if (value < 0)
-			ERROR(cdev, "audio response on err %d\n", value);
-	}
-
-	/* device either stalls (value < 0) or reports success */
-	return value;
-}
-
-static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
-{
-	struct f_audio		*audio = func_to_audio(f);
-	struct usb_composite_dev *cdev = f->config->cdev;
-	struct usb_ep *out_ep = audio->out_ep;
-	struct usb_request *req;
-	int i = 0, err = 0;
-
-	DBG(cdev, "intf %d, alt %d\n", intf, alt);
-
-	if (intf == 1) {
-		if (alt == 1) {
-			usb_ep_enable(out_ep);
-			out_ep->driver_data = audio;
-			audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
-			if (IS_ERR(audio->copy_buf))
-				return -ENOMEM;
-
-			/*
-			 * allocate a bunch of read buffers
-			 * and queue them all at once.
-			 */
-			for (i = 0; i < req_count && err == 0; i++) {
-				req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
-				if (req) {
-					req->buf = kzalloc(req_buf_size,
-							GFP_ATOMIC);
-					if (req->buf) {
-						req->length = req_buf_size;
-						req->context = audio;
-						req->complete =
-							f_audio_complete;
-						err = usb_ep_queue(out_ep,
-							req, GFP_ATOMIC);
-						if (err)
-							ERROR(cdev,
-							"%s queue req: %d\n",
-							out_ep->name, err);
-					} else
-						err = -ENOMEM;
-				} else
-					err = -ENOMEM;
-			}
-
-		} else {
-			struct f_audio_buf *copy_buf = audio->copy_buf;
-			if (copy_buf) {
-				list_add_tail(&copy_buf->list,
-						&audio->play_queue);
-				schedule_work(&audio->playback_work);
-			}
-		}
-	}
-
-	return err;
-}
-
-static void f_audio_disable(struct usb_function *f)
-{
-	return;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void f_audio_build_desc(struct f_audio *audio)
-{
-	struct gaudio *card = &audio->card;
-	u8 *sam_freq;
-	int rate;
-
-	/* Set channel numbers */
-	input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
-	as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
-
-	/* Set sample rates */
-	rate = u_audio_get_playback_rate(card);
-	sam_freq = as_type_i_desc.tSamFreq[0];
-	memcpy(sam_freq, &rate, 3);
-
-	/* Todo: Set Sample bits and other parameters */
-
-	return;
-}
-
-/* audio function driver setup/binding */
-static int __init
-f_audio_bind(struct usb_configuration *c, struct usb_function *f)
-{
-	struct usb_composite_dev *cdev = c->cdev;
-	struct f_audio		*audio = func_to_audio(f);
-	int			status;
-	struct usb_ep		*ep;
-
-	f_audio_build_desc(audio);
-
-	/* allocate instance-specific interface IDs, and patch descriptors */
-	status = usb_interface_id(c, f);
-	if (status < 0)
-		goto fail;
-	ac_interface_desc.bInterfaceNumber = status;
-
-	status = usb_interface_id(c, f);
-	if (status < 0)
-		goto fail;
-	as_interface_alt_0_desc.bInterfaceNumber = status;
-	as_interface_alt_1_desc.bInterfaceNumber = status;
-
-	status = -ENODEV;
-
-	/* allocate instance-specific endpoints */
-	ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
-	if (!ep)
-		goto fail;
-	audio->out_ep = ep;
-	audio->out_ep->desc = &as_out_ep_desc;
-	ep->driver_data = cdev;	/* claim */
-
-	status = -ENOMEM;
-
-	/* copy descriptors, and track endpoint copies */
-	f->descriptors = usb_copy_descriptors(f_audio_desc);
-
-	/*
-	 * support all relevant hardware speeds... we expect that when
-	 * hardware is dual speed, all bulk-capable endpoints work at
-	 * both speeds
-	 */
-	if (gadget_is_dualspeed(c->cdev->gadget)) {
-		c->highspeed = true;
-		f->hs_descriptors = usb_copy_descriptors(f_audio_desc);
-	}
-
-	return 0;
-
-fail:
-
-	return status;
-}
-
-static void
-f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
-{
-	struct f_audio		*audio = func_to_audio(f);
-
-	usb_free_descriptors(f->descriptors);
-	usb_free_descriptors(f->hs_descriptors);
-	kfree(audio);
-}
-
-/*-------------------------------------------------------------------------*/
-
-static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
-{
-	con->data[cmd] = value;
-
-	return 0;
-}
-
-static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
-{
-	return con->data[cmd];
-}
-
-/* Todo: add more control selecotor dynamically */
-int __init control_selector_init(struct f_audio *audio)
-{
-	INIT_LIST_HEAD(&audio->cs);
-	list_add(&feature_unit.list, &audio->cs);
-
-	INIT_LIST_HEAD(&feature_unit.control);
-	list_add(&mute_control.list, &feature_unit.control);
-	list_add(&volume_control.list, &feature_unit.control);
-
-	volume_control.data[UAC__CUR] = 0xffc0;
-	volume_control.data[UAC__MIN] = 0xe3a0;
-	volume_control.data[UAC__MAX] = 0xfff0;
-	volume_control.data[UAC__RES] = 0x0030;
-
-	return 0;
-}
-
-/**
- * audio_bind_config - add USB audio function to a configuration
- * @c: the configuration to supcard the USB audio function
- * Context: single threaded during gadget setup
- *
- * Returns zero on success, else negative errno.
- */
-int __init audio_bind_config(struct usb_configuration *c)
-{
-	struct f_audio *audio;
-	int status;
-
-	/* allocate and initialize one new instance */
-	audio = kzalloc(sizeof *audio, GFP_KERNEL);
-	if (!audio)
-		return -ENOMEM;
-
-	audio->card.func.name = "g_audio";
-	audio->card.gadget = c->cdev->gadget;
-
-	INIT_LIST_HEAD(&audio->play_queue);
-	spin_lock_init(&audio->lock);
-
-	/* set up ASLA audio devices */
-	status = gaudio_setup(&audio->card);
-	if (status < 0)
-		goto setup_fail;
-
-	audio->card.func.strings = audio_strings;
-	audio->card.func.bind = f_audio_bind;
-	audio->card.func.unbind = f_audio_unbind;
-	audio->card.func.set_alt = f_audio_set_alt;
-	audio->card.func.setup = f_audio_setup;
-	audio->card.func.disable = f_audio_disable;
-
-	control_selector_init(audio);
-
-	INIT_WORK(&audio->playback_work, f_audio_playback_work);
-
-	status = usb_add_function(c, &audio->card.func);
-	if (status)
-		goto add_fail;
-
-	INFO(c->cdev, "audio_buf_size %d, req_buf_size %d, req_count %d\n",
-		audio_buf_size, req_buf_size, req_count);
-
-	return status;
-
-add_fail:
-	gaudio_cleanup();
-setup_fail:
-	kfree(audio);
-	return status;
-}