Add realtek target files

Signed-off-by: Roman Yeryomin <roman@advem.lv>

1 files changed, 1570 insertions, 0 deletions

diff --git a/target/linux/realtek/files/drivers/usb/dwc_otg/dummy_audio.c b/target/linux/realtek/files/drivers/usb/dwc_otg/dummy_audio.c
new file mode 100644
index 000000000..b912086a7
--- /dev/null
+++ b/target/linux/realtek/files/drivers/usb/dwc_otg/dummy_audio.c
@@ -0,0 +1,1570 @@
+/*
+ * zero.c -- Gadget Zero, for USB development
+ *
+ * Copyright (C) 2003-2004 David Brownell
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+/*
+ * Gadget Zero only needs two bulk endpoints, and is an example of how you
+ * can write a hardware-agnostic gadget driver running inside a USB device.
+ *
+ * Hardware details are visible (see CONFIG_USB_ZERO_* below) but don't
+ * affect most of the driver.
+ *
+ * Use it with the Linux host/master side "usbtest" driver to get a basic
+ * functional test of your device-side usb stack, or with "usb-skeleton".
+ *
+ * It supports two similar configurations.  One sinks whatever the usb host
+ * writes, and in return sources zeroes.  The other loops whatever the host
+ * writes back, so the host can read it.  Module options include:
+ *
+ *   buflen=N		default N=4096, buffer size used
+ *   qlen=N		default N=32, how many buffers in the loopback queue
+ *   loopdefault	default false, list loopback config first
+ *
+ * Many drivers will only have one configuration, letting them be much
+ * simpler if they also don't support high speed operation (like this
+ * driver does).
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/uts.h>
+#include <linux/version.h>
+#include <linux/device.h>
+#include <linux/moduleparam.h>
+#include <linux/proc_fs.h>
+
+#include <asm/byteorder.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/unaligned.h>
+
+#include <linux/usb_ch9.h>
+#include <linux/usb_gadget.h>
+
+
+/*-------------------------------------------------------------------------*/
+/*-------------------------------------------------------------------------*/
+
+
+static int utf8_to_utf16le(const char *s, u16 *cp, unsigned len)
+{
+	int	count = 0;
+	u8	c;
+	u16	uchar;
+
+	/* this insists on correct encodings, though not minimal ones.
+	 * BUT it currently rejects legit 4-byte UTF-8 code points,
+	 * which need surrogate pairs.  (Unicode 3.1 can use them.)
+	 */
+	while (len != 0 && (c = (u8) *s++) != 0) {
+		if (unlikely(c & 0x80)) {
+			// 2-byte sequence:
+			// 00000yyyyyxxxxxx = 110yyyyy 10xxxxxx
+			if ((c & 0xe0) == 0xc0) {
+				uchar = (c & 0x1f) << 6;
+
+				c = (u8) *s++;
+				if ((c & 0xc0) != 0xc0)
+					goto fail;
+				c &= 0x3f;
+				uchar |= c;
+
+			// 3-byte sequence (most CJKV characters):
+			// zzzzyyyyyyxxxxxx = 1110zzzz 10yyyyyy 10xxxxxx
+			} else if ((c & 0xf0) == 0xe0) {
+				uchar = (c & 0x0f) << 12;
+
+				c = (u8) *s++;
+				if ((c & 0xc0) != 0xc0)
+					goto fail;
+				c &= 0x3f;
+				uchar |= c << 6;
+
+				c = (u8) *s++;
+				if ((c & 0xc0) != 0xc0)
+					goto fail;
+				c &= 0x3f;
+				uchar |= c;
+
+				/* no bogus surrogates */
+				if (0xd800 <= uchar && uchar <= 0xdfff)
+					goto fail;
+
+			// 4-byte sequence (surrogate pairs, currently rare):
+			// 11101110wwwwzzzzyy + 110111yyyyxxxxxx
+			//     = 11110uuu 10uuzzzz 10yyyyyy 10xxxxxx
+			// (uuuuu = wwww + 1)
+			// FIXME accept the surrogate code points (only)
+
+			} else
+				goto fail;
+		} else
+			uchar = c;
+		put_unaligned (cpu_to_le16 (uchar), cp++);
+		count++;
+		len--;
+	}
+	return count;
+fail:
+	return -1;
+}
+
+
+/**
+ * usb_gadget_get_string - fill out a string descriptor 
+ * @table: of c strings encoded using UTF-8
+ * @id: string id, from low byte of wValue in get string descriptor
+ * @buf: at least 256 bytes
+ *
+ * Finds the UTF-8 string matching the ID, and converts it into a
+ * string descriptor in utf16-le.
+ * Returns length of descriptor (always even) or negative errno
+ *
+ * If your driver needs stings in multiple languages, you'll probably
+ * "switch (wIndex) { ... }"  in your ep0 string descriptor logic,
+ * using this routine after choosing which set of UTF-8 strings to use.
+ * Note that US-ASCII is a strict subset of UTF-8; any string bytes with
+ * the eighth bit set will be multibyte UTF-8 characters, not ISO-8859/1
+ * characters (which are also widely used in C strings).
+ */
+int
+usb_gadget_get_string (struct usb_gadget_strings *table, int id, u8 *buf)
+{
+	struct usb_string	*s;
+	int			len;
+
+	/* descriptor 0 has the language id */
+	if (id == 0) {
+		buf [0] = 4;
+		buf [1] = USB_DT_STRING;
+		buf [2] = (u8) table->language;
+		buf [3] = (u8) (table->language >> 8);
+		return 4;
+	}
+	for (s = table->strings; s && s->s; s++)
+		if (s->id == id)
+			break;
+
+	/* unrecognized: stall. */
+	if (!s || !s->s)
+		return -EINVAL;
+
+	/* string descriptors have length, tag, then UTF16-LE text */
+	len = min ((size_t) 126, strlen (s->s));
+	memset (buf + 2, 0, 2 * len);	/* zero all the bytes */
+	len = utf8_to_utf16le(s->s, (u16 *)&buf[2], len);
+	if (len < 0)
+		return -EINVAL;
+	buf [0] = (len + 1) * 2;
+	buf [1] = USB_DT_STRING;
+	return buf [0];
+}
+
+
+/*-------------------------------------------------------------------------*/
+/*-------------------------------------------------------------------------*/
+
+
+/**
+ * usb_descriptor_fillbuf - fill buffer with descriptors
+ * @buf: Buffer to be filled
+ * @buflen: Size of buf
+ * @src: Array of descriptor pointers, terminated by null pointer.
+ *
+ * Copies descriptors into the buffer, returning the length or a
+ * negative error code if they can't all be copied.  Useful when
+ * assembling descriptors for an associated set of interfaces used
+ * as part of configuring a composite device; or in other cases where
+ * sets of descriptors need to be marshaled.
+ */
+int
+usb_descriptor_fillbuf(void *buf, unsigned buflen,
+		const struct usb_descriptor_header **src)
+{
+	u8	*dest = buf;
+
+	if (!src)
+		return -EINVAL;
+
+	/* fill buffer from src[] until null descriptor ptr */
+	for (; 0 != *src; src++) {
+		unsigned		len = (*src)->bLength;
+
+		if (len > buflen)
+			return -EINVAL;
+		memcpy(dest, *src, len);
+		buflen -= len;
+		dest += len;
+	}
+	return dest - (u8 *)buf;
+}
+
+
+/**
+ * usb_gadget_config_buf - builts a complete configuration descriptor
+ * @config: Header for the descriptor, including characteristics such
+ *	as power requirements and number of interfaces.
+ * @desc: Null-terminated vector of pointers to the descriptors (interface,
+ *	endpoint, etc) defining all functions in this device configuration.
+ * @buf: Buffer for the resulting configuration descriptor.
+ * @length: Length of buffer.  If this is not big enough to hold the
+ *	entire configuration descriptor, an error code will be returned.
+ *
+ * This copies descriptors into the response buffer, building a descriptor
+ * for that configuration.  It returns the buffer length or a negative
+ * status code.  The config.wTotalLength field is set to match the length
+ * of the result, but other descriptor fields (including power usage and
+ * interface count) must be set by the caller.
+ *
+ * Gadget drivers could use this when constructing a config descriptor
+ * in response to USB_REQ_GET_DESCRIPTOR.  They will need to patch the
+ * resulting bDescriptorType value if USB_DT_OTHER_SPEED_CONFIG is needed.
+ */
+int usb_gadget_config_buf(
+	const struct usb_config_descriptor	*config,
+	void					*buf,
+	unsigned				length,
+	const struct usb_descriptor_header	**desc
+)
+{
+	struct usb_config_descriptor		*cp = buf;
+	int					len;
+
+	/* config descriptor first */
+	if (length < USB_DT_CONFIG_SIZE || !desc)
+		return -EINVAL;
+	*cp = *config; 
+
+	/* then interface/endpoint/class/vendor/... */
+	len = usb_descriptor_fillbuf(USB_DT_CONFIG_SIZE + (u8*)buf,
+			length - USB_DT_CONFIG_SIZE, desc);
+	if (len < 0)
+		return len;
+	len += USB_DT_CONFIG_SIZE;
+	if (len > 0xffff)
+		return -EINVAL;
+
+	/* patch up the config descriptor */
+	cp->bLength = USB_DT_CONFIG_SIZE;
+	cp->bDescriptorType = USB_DT_CONFIG;
+	cp->wTotalLength = cpu_to_le16(len);
+	cp->bmAttributes |= USB_CONFIG_ATT_ONE;
+	return len;
+}
+
+/*-------------------------------------------------------------------------*/
+/*-------------------------------------------------------------------------*/
+
+
+#define RBUF_LEN (1024*1024)
+static int rbuf_start;
+static int rbuf_len;
+static __u8 rbuf[RBUF_LEN];
+
+/*-------------------------------------------------------------------------*/
+
+#define DRIVER_VERSION		"St Patrick's Day 2004"
+
+static const char shortname [] = "zero";
+static const char longname [] = "YAMAHA YST-MS35D USB Speaker  ";
+
+static const char source_sink [] = "source and sink data";
+static const char loopback [] = "loop input to output";
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * driver assumes self-powered hardware, and
+ * has no way for users to trigger remote wakeup.
+ *
+ * this version autoconfigures as much as possible,
+ * which is reasonable for most "bulk-only" drivers.
+ */
+static const char *EP_IN_NAME;		/* source */
+static const char *EP_OUT_NAME;		/* sink */
+
+/*-------------------------------------------------------------------------*/
+
+/* big enough to hold our biggest descriptor */
+#define USB_BUFSIZ	512
+
+struct zero_dev {
+	spinlock_t		lock;
+	struct usb_gadget	*gadget;
+	struct usb_request	*req;		/* for control responses */
+
+	/* when configured, we have one of two configs:
+	 * - source data (in to host) and sink it (out from host)
+	 * - or loop it back (out from host back in to host)
+	 */
+	u8			config;
+	struct usb_ep		*in_ep, *out_ep;
+
+	/* autoresume timer */
+	struct timer_list	resume;
+};
+
+#define xprintk(d,level,fmt,args...) \
+	dev_printk(level , &(d)->gadget->dev , fmt , ## args)
+
+#ifdef DEBUG
+#define DBG(dev,fmt,args...) \
+	xprintk(dev , KERN_DEBUG , fmt , ## args)
+#else
+#define DBG(dev,fmt,args...) \
+	do { } while (0)
+#endif /* DEBUG */
+
+#ifdef VERBOSE
+#define VDBG	DBG
+#else
+#define VDBG(dev,fmt,args...) \
+	do { } while (0)
+#endif /* VERBOSE */
+
+#define ERROR(dev,fmt,args...) \
+	xprintk(dev , KERN_ERR , fmt , ## args)
+#define WARN(dev,fmt,args...) \
+	xprintk(dev , KERN_WARNING , fmt , ## args)
+#define INFO(dev,fmt,args...) \
+	xprintk(dev , KERN_INFO , fmt , ## args)
+
+/*-------------------------------------------------------------------------*/
+
+static unsigned buflen = 4096;
+static unsigned qlen = 32;
+static unsigned pattern = 0;
+
+module_param (buflen, uint, S_IRUGO|S_IWUSR);
+module_param (qlen, uint, S_IRUGO|S_IWUSR);
+module_param (pattern, uint, S_IRUGO|S_IWUSR);
+
+/*
+ * if it's nonzero, autoresume says how many seconds to wait
+ * before trying to wake up the host after suspend.
+ */
+static unsigned autoresume = 0;
+module_param (autoresume, uint, 0);
+
+/*
+ * Normally the "loopback" configuration is second (index 1) so
+ * it's not the default.  Here's where to change that order, to
+ * work better with hosts where config changes are problematic.
+ * Or controllers (like superh) that only support one config.
+ */
+static int loopdefault = 0;
+
+module_param (loopdefault, bool, S_IRUGO|S_IWUSR);
+
+/*-------------------------------------------------------------------------*/
+
+/* Thanks to NetChip Technologies for donating this product ID.
+ *
+ * DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
+ * Instead:  allocate your own, using normal USB-IF procedures.
+ */
+#ifndef	CONFIG_USB_ZERO_HNPTEST
+#define DRIVER_VENDOR_NUM	0x0525		/* NetChip */
+#define DRIVER_PRODUCT_NUM	0xa4a0		/* Linux-USB "Gadget Zero" */
+#else
+#define DRIVER_VENDOR_NUM	0x1a0a		/* OTG test device IDs */
+#define DRIVER_PRODUCT_NUM	0xbadd
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * DESCRIPTORS ... most are static, but strings and (full)
+ * configuration descriptors are built on demand.
+ */
+
+/*
+#define STRING_MANUFACTURER		25
+#define STRING_PRODUCT			42
+#define STRING_SERIAL			101
+*/
+#define STRING_MANUFACTURER		1
+#define STRING_PRODUCT			2
+#define STRING_SERIAL			3
+
+#define STRING_SOURCE_SINK		250
+#define STRING_LOOPBACK			251
+
+/*
+ * This device advertises two configurations; these numbers work
+ * on a pxa250 as well as more flexible hardware.
+ */
+#define	CONFIG_SOURCE_SINK	3
+#define	CONFIG_LOOPBACK		2
+
+/*
+static struct usb_device_descriptor
+device_desc = {
+	.bLength =		sizeof device_desc,
+	.bDescriptorType =	USB_DT_DEVICE,
+
+	.bcdUSB =		__constant_cpu_to_le16 (0x0200),
+	.bDeviceClass =		USB_CLASS_VENDOR_SPEC,
+
+	.idVendor =		__constant_cpu_to_le16 (DRIVER_VENDOR_NUM),
+	.idProduct =		__constant_cpu_to_le16 (DRIVER_PRODUCT_NUM),
+	.iManufacturer =	STRING_MANUFACTURER,
+	.iProduct =		STRING_PRODUCT,
+	.iSerialNumber =	STRING_SERIAL,
+	.bNumConfigurations =	2,
+};
+*/
+static struct usb_device_descriptor
+device_desc = {
+	.bLength =		sizeof device_desc,
+	.bDescriptorType =	USB_DT_DEVICE,
+	.bcdUSB =		__constant_cpu_to_le16 (0x0100),
+	.bDeviceClass =		USB_CLASS_PER_INTERFACE,
+	.bDeviceSubClass =      0,
+	.bDeviceProtocol =      0,
+	.bMaxPacketSize0 =      64,
+	.bcdDevice =            __constant_cpu_to_le16 (0x0100),
+	.idVendor =		__constant_cpu_to_le16 (0x0499),
+	.idProduct =		__constant_cpu_to_le16 (0x3002),
+	.iManufacturer =	STRING_MANUFACTURER,
+	.iProduct =		STRING_PRODUCT,
+	.iSerialNumber =	STRING_SERIAL,
+	.bNumConfigurations =	1,
+};
+
+static struct usb_config_descriptor
+z_config = {
+	.bLength =		sizeof z_config,
+	.bDescriptorType =	USB_DT_CONFIG,
+
+	/* compute wTotalLength on the fly */
+	.bNumInterfaces =	2,
+	.bConfigurationValue =	1,
+	.iConfiguration =	0,
+	.bmAttributes =		0x40,
+	.bMaxPower =		0,	/* self-powered */
+};
+
+
+static struct usb_otg_descriptor
+otg_descriptor = {
+	.bLength =		sizeof otg_descriptor,
+	.bDescriptorType =	USB_DT_OTG,
+
+	.bmAttributes =		USB_OTG_SRP,
+};
+
+/* one interface in each configuration */
+#ifdef	CONFIG_USB_GADGET_DUALSPEED
+
+/*
+ * usb 2.0 devices need to expose both high speed and full speed
+ * descriptors, unless they only run at full speed.
+ *
+ * that means alternate endpoint descriptors (bigger packets)
+ * and a "device qualifier" ... plus more construction options
+ * for the config descriptor.
+ */
+
+static struct usb_qualifier_descriptor
+dev_qualifier = {
+	.bLength =		sizeof dev_qualifier,
+	.bDescriptorType =	USB_DT_DEVICE_QUALIFIER,
+
+	.bcdUSB =		__constant_cpu_to_le16 (0x0200),
+	.bDeviceClass =		USB_CLASS_VENDOR_SPEC,
+
+	.bNumConfigurations =	2,
+};
+
+
+struct usb_cs_as_general_descriptor {
+	__u8  bLength;
+	__u8  bDescriptorType;
+
+	__u8  bDescriptorSubType;
+	__u8  bTerminalLink;
+	__u8  bDelay;
+	__u16  wFormatTag;
+} __attribute__ ((packed));
+
+struct usb_cs_as_format_descriptor {
+	__u8  bLength;
+	__u8  bDescriptorType;
+
+	__u8  bDescriptorSubType;
+	__u8  bFormatType;
+	__u8  bNrChannels;
+	__u8  bSubframeSize;
+	__u8  bBitResolution;
+	__u8  bSamfreqType;
+	__u8  tLowerSamFreq[3];
+	__u8  tUpperSamFreq[3];
+} __attribute__ ((packed));
+
+static const struct usb_interface_descriptor
+z_audio_control_if_desc = {
+	.bLength =		sizeof z_audio_control_if_desc,
+	.bDescriptorType =	USB_DT_INTERFACE,
+	.bInterfaceNumber = 0,
+	.bAlternateSetting = 0,
+	.bNumEndpoints = 0,
+	.bInterfaceClass = USB_CLASS_AUDIO,
+	.bInterfaceSubClass = 0x1,
+	.bInterfaceProtocol = 0,
+	.iInterface = 0,
+};
+
+static const struct usb_interface_descriptor
+z_audio_if_desc = {
+	.bLength =		sizeof z_audio_if_desc,
+	.bDescriptorType =	USB_DT_INTERFACE,
+	.bInterfaceNumber = 1,
+	.bAlternateSetting = 0,
+	.bNumEndpoints = 0,
+	.bInterfaceClass = USB_CLASS_AUDIO,
+	.bInterfaceSubClass = 0x2,
+	.bInterfaceProtocol = 0,
+	.iInterface = 0,
+};
+
+static const struct usb_interface_descriptor
+z_audio_if_desc2 = {
+	.bLength =		sizeof z_audio_if_desc,
+	.bDescriptorType =	USB_DT_INTERFACE,
+	.bInterfaceNumber = 1,
+	.bAlternateSetting = 1,
+	.bNumEndpoints = 1,
+	.bInterfaceClass = USB_CLASS_AUDIO,
+	.bInterfaceSubClass = 0x2,
+	.bInterfaceProtocol = 0,
+	.iInterface = 0,
+};
+
+static const struct usb_cs_as_general_descriptor
+z_audio_cs_as_if_desc = {
+	.bLength = 7,
+	.bDescriptorType = 0x24,
+	
+	.bDescriptorSubType = 0x01,
+	.bTerminalLink = 0x01,
+	.bDelay = 0x0,
+	.wFormatTag = __constant_cpu_to_le16 (0x0001)
+};
+
+
+static const struct usb_cs_as_format_descriptor 
+z_audio_cs_as_format_desc = {
+	.bLength = 0xe,
+	.bDescriptorType = 0x24,
+	
+	.bDescriptorSubType = 2,
+	.bFormatType = 1,
+	.bNrChannels = 1,
+	.bSubframeSize = 1,
+	.bBitResolution = 8,
+	.bSamfreqType = 0,
+	.tLowerSamFreq = {0x7e, 0x13, 0x00},
+	.tUpperSamFreq = {0xe2, 0xd6, 0x00},
+};
+
+static const struct usb_endpoint_descriptor 
+z_iso_ep = {
+	.bLength = 0x09,
+	.bDescriptorType = 0x05,
+	.bEndpointAddress = 0x04,
+	.bmAttributes = 0x09,
+	.wMaxPacketSize = 0x0038,
+	.bInterval = 0x01,
+	.bRefresh = 0x00,
+	.bSynchAddress = 0x00,	
+};
+
+static char z_iso_ep2[] = {0x07, 0x25, 0x01, 0x00, 0x02, 0x00, 0x02};
+
+// 9 bytes
+static char z_ac_interface_header_desc[] = 
+{ 0x09, 0x24, 0x01, 0x00, 0x01, 0x2b, 0x00, 0x01, 0x01 };
+
+// 12 bytes
+static char z_0[] = {0x0c, 0x24, 0x02, 0x01, 0x01, 0x01, 0x00, 0x02, 
+		     0x03, 0x00, 0x00, 0x00};
+// 13 bytes
+static char z_1[] = {0x0d, 0x24, 0x06, 0x02, 0x01, 0x02, 0x15, 0x00, 
+		     0x02, 0x00, 0x02, 0x00, 0x00};
+// 9 bytes
+static char z_2[] = {0x09, 0x24, 0x03, 0x03, 0x01, 0x03, 0x00, 0x02, 
+		     0x00};
+
+static char za_0[] = {0x09, 0x04, 0x01, 0x02, 0x01, 0x01, 0x02, 0x00, 
+		      0x00};
+
+static char za_1[] = {0x07, 0x24, 0x01, 0x01, 0x00, 0x01, 0x00};
+
+static char za_2[] = {0x0e, 0x24, 0x02, 0x01, 0x02, 0x01, 0x08, 0x00, 
+		      0x7e, 0x13, 0x00, 0xe2, 0xd6, 0x00};
+
+static char za_3[] = {0x09, 0x05, 0x04, 0x09, 0x70, 0x00, 0x01, 0x00,
+		      0x00};
+
+static char za_4[] = {0x07, 0x25, 0x01, 0x00, 0x02, 0x00, 0x02};
+
+static char za_5[] = {0x09, 0x04, 0x01, 0x03, 0x01, 0x01, 0x02, 0x00,
+		      0x00};
+
+static char za_6[] = {0x07, 0x24, 0x01, 0x01, 0x00, 0x01, 0x00};
+
+static char za_7[] = {0x0e, 0x24, 0x02, 0x01, 0x01, 0x02, 0x10, 0x00,
+		      0x7e, 0x13, 0x00, 0xe2, 0xd6, 0x00};
+
+static char za_8[] = {0x09, 0x05, 0x04, 0x09, 0x70, 0x00, 0x01, 0x00,
+		      0x00};
+
+static char za_9[] = {0x07, 0x25, 0x01, 0x00, 0x02, 0x00, 0x02};
+
+static char za_10[] = {0x09, 0x04, 0x01, 0x04, 0x01, 0x01, 0x02, 0x00,
+		       0x00};
+
+static char za_11[] = {0x07, 0x24, 0x01, 0x01, 0x00, 0x01, 0x00};
+
+static char za_12[] = {0x0e, 0x24, 0x02, 0x01, 0x02, 0x02, 0x10, 0x00,
+		       0x73, 0x13, 0x00, 0xe2, 0xd6, 0x00};
+
+static char za_13[] = {0x09, 0x05, 0x04, 0x09, 0xe0, 0x00, 0x01, 0x00,
+		       0x00};
+
+static char za_14[] = {0x07, 0x25, 0x01, 0x00, 0x02, 0x00, 0x02};
+
+static char za_15[] = {0x09, 0x04, 0x01, 0x05, 0x01, 0x01, 0x02, 0x00, 
+		       0x00};
+
+static char za_16[] = {0x07, 0x24, 0x01, 0x01, 0x00, 0x01, 0x00};
+
+static char za_17[] = {0x0e, 0x24, 0x02, 0x01, 0x01, 0x03, 0x14, 0x00, 
+		       0x7e, 0x13, 0x00, 0xe2, 0xd6, 0x00};
+
+static char za_18[] = {0x09, 0x05, 0x04, 0x09, 0xa8, 0x00, 0x01, 0x00,
+		       0x00};
+
+static char za_19[] = {0x07, 0x25, 0x01, 0x00, 0x02, 0x00, 0x02};
+
+static char za_20[] = {0x09, 0x04, 0x01, 0x06, 0x01, 0x01, 0x02, 0x00,
+		       0x00};
+
+static char za_21[] = {0x07, 0x24, 0x01, 0x01, 0x00, 0x01, 0x00};
+
+static char za_22[] = {0x0e, 0x24, 0x02, 0x01, 0x02, 0x03, 0x14, 0x00, 
+		       0x7e, 0x13, 0x00, 0xe2, 0xd6, 0x00};
+
+static char za_23[] = {0x09, 0x05, 0x04, 0x09, 0x50, 0x01, 0x01, 0x00,
+		       0x00};
+
+static char za_24[] = {0x07, 0x25, 0x01, 0x00, 0x02, 0x00, 0x02};
+
+
+
+static const struct usb_descriptor_header *z_function [] = {
+	(struct usb_descriptor_header *) &z_audio_control_if_desc,
+	(struct usb_descriptor_header *) &z_ac_interface_header_desc,
+	(struct usb_descriptor_header *) &z_0,
+	(struct usb_descriptor_header *) &z_1,
+	(struct usb_descriptor_header *) &z_2,
+	(struct usb_descriptor_header *) &z_audio_if_desc,
+	(struct usb_descriptor_header *) &z_audio_if_desc2,
+	(struct usb_descriptor_header *) &z_audio_cs_as_if_desc,
+	(struct usb_descriptor_header *) &z_audio_cs_as_format_desc,
+	(struct usb_descriptor_header *) &z_iso_ep,
+	(struct usb_descriptor_header *) &z_iso_ep2,
+	(struct usb_descriptor_header *) &za_0,
+	(struct usb_descriptor_header *) &za_1,
+	(struct usb_descriptor_header *) &za_2,
+	(struct usb_descriptor_header *) &za_3,
+	(struct usb_descriptor_header *) &za_4,
+	(struct usb_descriptor_header *) &za_5,
+	(struct usb_descriptor_header *) &za_6,
+	(struct usb_descriptor_header *) &za_7,
+	(struct usb_descriptor_header *) &za_8,
+	(struct usb_descriptor_header *) &za_9,
+	(struct usb_descriptor_header *) &za_10,
+	(struct usb_descriptor_header *) &za_11,
+	(struct usb_descriptor_header *) &za_12,
+	(struct usb_descriptor_header *) &za_13,
+	(struct usb_descriptor_header *) &za_14,
+	(struct usb_descriptor_header *) &za_15,
+	(struct usb_descriptor_header *) &za_16,
+	(struct usb_descriptor_header *) &za_17,
+	(struct usb_descriptor_header *) &za_18,
+	(struct usb_descriptor_header *) &za_19,
+	(struct usb_descriptor_header *) &za_20,
+	(struct usb_descriptor_header *) &za_21,
+	(struct usb_descriptor_header *) &za_22,
+	(struct usb_descriptor_header *) &za_23,
+	(struct usb_descriptor_header *) &za_24,
+	NULL,
+};
+
+/* maxpacket and other transfer characteristics vary by speed. */
+#define ep_desc(g,hs,fs) (((g)->speed==USB_SPEED_HIGH)?(hs):(fs))
+
+#else
+
+/* if there's no high speed support, maxpacket doesn't change. */
+#define ep_desc(g,hs,fs) fs
+
+#endif	/* !CONFIG_USB_GADGET_DUALSPEED */
+
+static char				manufacturer [40];
+//static char				serial [40];
+static char				serial [] = "Ser 00 em";
+
+/* static strings, in UTF-8 */
+static struct usb_string		strings [] = {
+	{ STRING_MANUFACTURER, manufacturer, },
+	{ STRING_PRODUCT, longname, },
+	{ STRING_SERIAL, serial, },
+	{ STRING_LOOPBACK, loopback, },
+	{ STRING_SOURCE_SINK, source_sink, },
+	{  }			/* end of list */
+};
+
+static struct usb_gadget_strings	stringtab = {
+	.language	= 0x0409,	/* en-us */
+	.strings	= strings,
+};
+
+/*
+ * config descriptors are also handcrafted.  these must agree with code
+ * that sets configurations, and with code managing interfaces and their
+ * altsettings.  other complexity may come from:
+ *
+ *  - high speed support, including "other speed config" rules
+ *  - multiple configurations
+ *  - interfaces with alternate settings
+ *  - embedded class or vendor-specific descriptors
+ *
+ * this handles high speed, and has a second config that could as easily
+ * have been an alternate interface setting (on most hardware).
+ *
+ * NOTE:  to demonstrate (and test) more USB capabilities, this driver
+ * should include an altsetting to test interrupt transfers, including
+ * high bandwidth modes at high speed.  (Maybe work like Intel's test
+ * device?)
+ */
+static int
+config_buf (struct usb_gadget *gadget, u8 *buf, u8 type, unsigned index)
+{
+	int len;
+	const struct usb_descriptor_header **function;
+	
+	function = z_function;
+	len = usb_gadget_config_buf (&z_config, buf, USB_BUFSIZ, function);
+	if (len < 0)
+		return len;
+	((struct usb_config_descriptor *) buf)->bDescriptorType = type;
+	return len;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static struct usb_request *
+alloc_ep_req (struct usb_ep *ep, unsigned length)
+{
+	struct usb_request	*req;
+
+	req = usb_ep_alloc_request (ep, GFP_ATOMIC);
+	if (req) {
+		req->length = length;
+		req->buf = usb_ep_alloc_buffer (ep, length,
+				&req->dma, GFP_ATOMIC);
+		if (!req->buf) {
+			usb_ep_free_request (ep, req);
+			req = NULL;
+		}
+	}
+	return req;
+}
+
+static void free_ep_req (struct usb_ep *ep, struct usb_request *req)
+{
+	if (req->buf)
+		usb_ep_free_buffer (ep, req->buf, req->dma, req->length);
+	usb_ep_free_request (ep, req);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* optionally require specific source/sink data patterns  */
+
+static int
+check_read_data (
+	struct zero_dev		*dev,
+	struct usb_ep		*ep,
+	struct usb_request	*req
+)
+{
+	unsigned	i;
+	u8		*buf = req->buf;
+
+	for (i = 0; i < req->actual; i++, buf++) {
+		switch (pattern) {
+		/* all-zeroes has no synchronization issues */
+		case 0:
+			if (*buf == 0)
+				continue;
+			break;
+		/* mod63 stays in sync with short-terminated transfers,
+		 * or otherwise when host and gadget agree on how large
+		 * each usb transfer request should be.  resync is done
+		 * with set_interface or set_config.
+		 */
+		case 1:
+			if (*buf == (u8)(i % 63))
+				continue;
+			break;
+		}
+		ERROR (dev, "bad OUT byte, buf [%d] = %d\n", i, *buf);
+		usb_ep_set_halt (ep);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void zero_reset_config (struct zero_dev *dev)
+{
+	if (dev->config == 0)
+		return;
+
+	DBG (dev, "reset config\n");
+
+	/* just disable endpoints, forcing completion of pending i/o.
+	 * all our completion handlers free their requests in this case.
+	 */
+	if (dev->in_ep) {
+		usb_ep_disable (dev->in_ep);
+		dev->in_ep = NULL;
+	}
+	if (dev->out_ep) {
+		usb_ep_disable (dev->out_ep);
+		dev->out_ep = NULL;
+	}
+	dev->config = 0;
+	del_timer (&dev->resume);
+}
+
+#define _write(f, buf, sz) (f->f_op->write(f, buf, sz, &f->f_pos))
+
+static void 
+zero_isoc_complete (struct usb_ep *ep, struct usb_request *req)
+{
+	struct zero_dev	*dev = ep->driver_data;
+	int		status = req->status;
+	int i, j;
+
+	switch (status) {
+
+	case 0: 			/* normal completion? */
+		//printk ("\nzero ---------------> isoc normal completion %d bytes\n", req->actual);
+		for (i=0, j=rbuf_start; i<req->actual; i++) {
+			//printk ("%02x ", ((__u8*)req->buf)[i]);
+			rbuf[j] = ((__u8*)req->buf)[i];
+			j++;
+			if (j >= RBUF_LEN) j=0;
+		}
+		rbuf_start = j;
+		//printk ("\n\n");
+
+		if (rbuf_len < RBUF_LEN) {
+			rbuf_len += req->actual;
+			if (rbuf_len > RBUF_LEN) {
+				rbuf_len = RBUF_LEN;
+			}
+		}
+
+		break;
+
+	/* this endpoint is normally active while we're configured */
+	case -ECONNABORTED: 		/* hardware forced ep reset */
+	case -ECONNRESET:		/* request dequeued */
+	case -ESHUTDOWN:		/* disconnect from host */
+		VDBG (dev, "%s gone (%d), %d/%d\n", ep->name, status,
+				req->actual, req->length);
+		if (ep == dev->out_ep)
+			check_read_data (dev, ep, req);
+		free_ep_req (ep, req);
+		return;
+
+	case -EOVERFLOW:		/* buffer overrun on read means that
+					 * we didn't provide a big enough
+					 * buffer.
+					 */
+	default:
+#if 1
+		DBG (dev, "%s complete --> %d, %d/%d\n", ep->name,
+				status, req->actual, req->length);
+#endif
+	case -EREMOTEIO:		/* short read */
+		break;
+	}
+
+	status = usb_ep_queue (ep, req, GFP_ATOMIC);
+	if (status) {
+		ERROR (dev, "kill %s:  resubmit %d bytes --> %d\n",
+				ep->name, req->length, status);
+		usb_ep_set_halt (ep);
+		/* FIXME recover later ... somehow */
+	}
+}
+
+static struct usb_request *
+zero_start_isoc_ep (struct usb_ep *ep, int gfp_flags)
+{
+	struct usb_request	*req;
+	int			status;
+
+	req = alloc_ep_req (ep, 512);
+	if (!req)
+		return NULL;
+
+	req->complete = zero_isoc_complete;
+
+	status = usb_ep_queue (ep, req, gfp_flags);
+	if (status) {
+		struct zero_dev	*dev = ep->driver_data;
+
+		ERROR (dev, "start %s --> %d\n", ep->name, status);
+		free_ep_req (ep, req);
+		req = NULL;
+	}
+
+	return req;
+}
+
+/* change our operational config.  this code must agree with the code
+ * that returns config descriptors, and altsetting code.
+ *
+ * it's also responsible for power management interactions. some
+ * configurations might not work with our current power sources.
+ *
+ * note that some device controller hardware will constrain what this
+ * code can do, perhaps by disallowing more than one configuration or
+ * by limiting configuration choices (like the pxa2xx).
+ */
+static int
+zero_set_config (struct zero_dev *dev, unsigned number, int gfp_flags)
+{
+	int			result = 0;
+	struct usb_gadget	*gadget = dev->gadget;
+	const struct usb_endpoint_descriptor	*d;
+	struct usb_ep		*ep;
+
+	if (number == dev->config)
+		return 0;
+
+	zero_reset_config (dev);
+
+	gadget_for_each_ep (ep, gadget) {
+
+		if (strcmp (ep->name, "ep4") == 0) {
+
+			d = (struct usb_endpoint_descripter *)&za_23; // isoc ep desc for audio i/f alt setting 6
+			result = usb_ep_enable (ep, d);
+
+			if (result == 0) {
+				ep->driver_data = dev;
+				dev->in_ep = ep;
+
+				if (zero_start_isoc_ep (ep, gfp_flags) != 0) {
+
+					dev->in_ep = ep;
+					continue;
+				}
+
+				usb_ep_disable (ep);
+				result = -EIO;
+			}
+		}
+
+	}
+
+	dev->config = number;
+	return result;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void zero_setup_complete (struct usb_ep *ep, struct usb_request *req)
+{
+	if (req->status || req->actual != req->length)
+		DBG ((struct zero_dev *) ep->driver_data,
+				"setup complete --> %d, %d/%d\n",
+				req->status, req->actual, req->length);
+}
+
+/*
+ * The setup() callback implements all the ep0 functionality that's
+ * not handled lower down, in hardware or the hardware driver (like
+ * device and endpoint feature flags, and their status).  It's all
+ * housekeeping for the gadget function we're implementing.  Most of
+ * the work is in config-specific setup.
+ */
+static int
+zero_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
+{
+	struct zero_dev		*dev = get_gadget_data (gadget);
+	struct usb_request	*req = dev->req;
+	int			value = -EOPNOTSUPP;
+
+	/* usually this stores reply data in the pre-allocated ep0 buffer,
+	 * but config change events will reconfigure hardware.
+	 */
+	req->zero = 0;
+	switch (ctrl->bRequest) {
+
+	case USB_REQ_GET_DESCRIPTOR:
+
+		switch (ctrl->wValue >> 8) {
+
+		case USB_DT_DEVICE:
+			value = min (ctrl->wLength, (u16) sizeof device_desc);
+			memcpy (req->buf, &device_desc, value);
+			break;
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+		case USB_DT_DEVICE_QUALIFIER:
+			if (!gadget->is_dualspeed)
+				break;
+			value = min (ctrl->wLength, (u16) sizeof dev_qualifier);
+			memcpy (req->buf, &dev_qualifier, value);
+			break;
+
+		case USB_DT_OTHER_SPEED_CONFIG:
+			if (!gadget->is_dualspeed)
+				break;
+			// FALLTHROUGH
+#endif /* CONFIG_USB_GADGET_DUALSPEED */
+		case USB_DT_CONFIG:
+			value = config_buf (gadget, req->buf,
+					ctrl->wValue >> 8,
+					ctrl->wValue & 0xff);
+			if (value >= 0)
+				value = min (ctrl->wLength, (u16) value);
+			break;
+
+		case USB_DT_STRING:
+			/* wIndex == language code.
+			 * this driver only handles one language, you can
+			 * add string tables for other languages, using
+			 * any UTF-8 characters
+			 */
+			value = usb_gadget_get_string (&stringtab,
+					ctrl->wValue & 0xff, req->buf);
+			if (value >= 0) {
+				value = min (ctrl->wLength, (u16) value);
+			}
+			break;
+		}
+		break;
+
+	/* currently two configs, two speeds */
+	case USB_REQ_SET_CONFIGURATION:
+		if (ctrl->bRequestType != 0)
+			goto unknown;
+
+		spin_lock (&dev->lock);
+		value = zero_set_config (dev, ctrl->wValue, GFP_ATOMIC);
+		spin_unlock (&dev->lock);
+		break;
+	case USB_REQ_GET_CONFIGURATION:
+		if (ctrl->bRequestType != USB_DIR_IN)
+			goto unknown;
+		*(u8 *)req->buf = dev->config;
+		value = min (ctrl->wLength, (u16) 1);
+		break;
+
+	/* until we add altsetting support, or other interfaces,
+	 * only 0/0 are possible.  pxa2xx only supports 0/0 (poorly)
+	 * and already killed pending endpoint I/O.
+	 */
+	case USB_REQ_SET_INTERFACE:
+
+		if (ctrl->bRequestType != USB_RECIP_INTERFACE)
+			goto unknown;
+		spin_lock (&dev->lock);
+		if (dev->config) {
+			u8		config = dev->config;
+
+			/* resets interface configuration, forgets about
+			 * previous transaction state (queued bufs, etc)
+			 * and re-inits endpoint state (toggle etc)
+			 * no response queued, just zero status == success.
+			 * if we had more than one interface we couldn't
+			 * use this "reset the config" shortcut.
+			 */
+			zero_reset_config (dev);
+			zero_set_config (dev, config, GFP_ATOMIC);
+			value = 0;
+		}
+		spin_unlock (&dev->lock);
+		break;
+	case USB_REQ_GET_INTERFACE:
+		if ((ctrl->bRequestType == 0x21) && (ctrl->wIndex == 0x02)) {
+			value = ctrl->wLength;
+			break;
+		}
+		else {
+			if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
+				goto unknown;
+			if (!dev->config)
+				break;
+			if (ctrl->wIndex != 0) {
+				value = -EDOM;
+				break;
+			}
+			*(u8 *)req->buf = 0;
+			value = min (ctrl->wLength, (u16) 1);
+		}
+		break;
+
+	/*
+	 * These are the same vendor-specific requests supported by
+	 * Intel's USB 2.0 compliance test devices.  We exceed that
+	 * device spec by allowing multiple-packet requests.
+	 */
+	case 0x5b:	/* control WRITE test -- fill the buffer */
+		if (ctrl->bRequestType != (USB_DIR_OUT|USB_TYPE_VENDOR))
+			goto unknown;
+		if (ctrl->wValue || ctrl->wIndex)
+			break;
+		/* just read that many bytes into the buffer */
+		if (ctrl->wLength > USB_BUFSIZ)
+			break;
+		value = ctrl->wLength;
+		break;
+	case 0x5c:	/* control READ test -- return the buffer */
+		if (ctrl->bRequestType != (USB_DIR_IN|USB_TYPE_VENDOR))
+			goto unknown;
+		if (ctrl->wValue || ctrl->wIndex)
+			break;
+		/* expect those bytes are still in the buffer; send back */
+		if (ctrl->wLength > USB_BUFSIZ
+				|| ctrl->wLength != req->length)
+			break;
+		value = ctrl->wLength;
+		break;
+
+	case 0x01: // SET_CUR
+	case 0x02:
+	case 0x03:
+	case 0x04:
+	case 0x05:
+		value = ctrl->wLength;
+		break;
+	case 0x81:
+		switch (ctrl->wValue) {
+		case 0x0201:
+		case 0x0202:
+			((u8*)req->buf)[0] = 0x00;
+			((u8*)req->buf)[1] = 0xe3;
+			break;
+		case 0x0300:
+		case 0x0500:
+			((u8*)req->buf)[0] = 0x00;
+			break;
+		}
+		//((u8*)req->buf)[0] = 0x81;
+		//((u8*)req->buf)[1] = 0x81;
+		value = ctrl->wLength;
+		break;
+	case 0x82:
+		switch (ctrl->wValue) {
+		case 0x0201:
+		case 0x0202:
+			((u8*)req->buf)[0] = 0x00;
+			((u8*)req->buf)[1] = 0xc3;
+			break;
+		case 0x0300:
+		case 0x0500:
+			((u8*)req->buf)[0] = 0x00;
+			break;
+		}
+		//((u8*)req->buf)[0] = 0x82;
+		//((u8*)req->buf)[1] = 0x82;
+		value = ctrl->wLength;
+		break;
+	case 0x83:
+		switch (ctrl->wValue) {
+		case 0x0201:
+		case 0x0202:
+			((u8*)req->buf)[0] = 0x00;
+			((u8*)req->buf)[1] = 0x00;
+			break;
+		case 0x0300:
+			((u8*)req->buf)[0] = 0x60;
+			break;
+		case 0x0500:	
+			((u8*)req->buf)[0] = 0x18;
+			break;
+		}
+		//((u8*)req->buf)[0] = 0x83;
+		//((u8*)req->buf)[1] = 0x83;
+		value = ctrl->wLength;
+		break;
+	case 0x84:
+		switch (ctrl->wValue) {
+		case 0x0201:
+		case 0x0202:
+			((u8*)req->buf)[0] = 0x00;
+			((u8*)req->buf)[1] = 0x01;
+			break;
+		case 0x0300:
+		case 0x0500:
+			((u8*)req->buf)[0] = 0x08;
+			break;
+		}
+		//((u8*)req->buf)[0] = 0x84;
+		//((u8*)req->buf)[1] = 0x84;
+		value = ctrl->wLength;
+		break;
+	case 0x85:
+		((u8*)req->buf)[0] = 0x85;
+		((u8*)req->buf)[1] = 0x85;
+		value = ctrl->wLength;
+		break;
+
+	
+	default:
+unknown:
+		printk("unknown control req%02x.%02x v%04x i%04x l%d\n",
+			ctrl->bRequestType, ctrl->bRequest,
+			ctrl->wValue, ctrl->wIndex, ctrl->wLength);
+	}
+
+	/* respond with data transfer before status phase? */
+	if (value >= 0) {
+		req->length = value;
+		req->zero = value < ctrl->wLength
+				&& (value % gadget->ep0->maxpacket) == 0;
+		value = usb_ep_queue (gadget->ep0, req, GFP_ATOMIC);
+		if (value < 0) {
+			DBG (dev, "ep_queue < 0 --> %d\n", value);
+			req->status = 0;
+			zero_setup_complete (gadget->ep0, req);
+		}
+	}
+
+	/* device either stalls (value < 0) or reports success */
+	return value;
+}
+
+static void
+zero_disconnect (struct usb_gadget *gadget)
+{
+	struct zero_dev		*dev = get_gadget_data (gadget);
+	unsigned long		flags;
+
+	spin_lock_irqsave (&dev->lock, flags);
+	zero_reset_config (dev);
+
+	/* a more significant application might have some non-usb
+	 * activities to quiesce here, saving resources like power
+	 * or pushing the notification up a network stack.
+	 */
+	spin_unlock_irqrestore (&dev->lock, flags);
+
+	/* next we may get setup() calls to enumerate new connections;
+	 * or an unbind() during shutdown (including removing module).
+	 */
+}
+
+static void
+zero_autoresume (unsigned long _dev)
+{
+	struct zero_dev	*dev = (struct zero_dev *) _dev;
+	int		status;
+
+	/* normally the host would be woken up for something
+	 * more significant than just a timer firing...
+	 */
+	if (dev->gadget->speed != USB_SPEED_UNKNOWN) {
+		status = usb_gadget_wakeup (dev->gadget);
+		DBG (dev, "wakeup --> %d\n", status);
+	}
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void
+zero_unbind (struct usb_gadget *gadget)
+{
+	struct zero_dev		*dev = get_gadget_data (gadget);
+
+	DBG (dev, "unbind\n");
+
+	/* we've already been disconnected ... no i/o is active */
+	if (dev->req)
+		free_ep_req (gadget->ep0, dev->req);
+	del_timer_sync (&dev->resume);
+	kfree (dev);
+	set_gadget_data (gadget, NULL);
+}
+
+static int
+zero_bind (struct usb_gadget *gadget)
+{
+	struct zero_dev		*dev;
+	//struct usb_ep		*ep;
+
+	printk("binding\n");
+	/*
+	 * DRIVER POLICY CHOICE:  you may want to do this differently.
+	 * One thing to avoid is reusing a bcdDevice revision code
+	 * with different host-visible configurations or behavior
+	 * restrictions -- using ep1in/ep2out vs ep1out/ep3in, etc
+	 */
+	//device_desc.bcdDevice = __constant_cpu_to_le16 (0x0201);
+
+
+	/* ok, we made sense of the hardware ... */
+	dev = kmalloc (sizeof *dev, SLAB_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+	memset (dev, 0, sizeof *dev);
+	spin_lock_init (&dev->lock);
+	dev->gadget = gadget;
+	set_gadget_data (gadget, dev);
+
+	/* preallocate control response and buffer */
+	dev->req = usb_ep_alloc_request (gadget->ep0, GFP_KERNEL);
+	if (!dev->req)
+		goto enomem;
+	dev->req->buf = usb_ep_alloc_buffer (gadget->ep0, USB_BUFSIZ,
+				&dev->req->dma, GFP_KERNEL);
+	if (!dev->req->buf)
+		goto enomem;
+
+	dev->req->complete = zero_setup_complete;
+
+	device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
+
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+	/* assume ep0 uses the same value for both speeds ... */
+	dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
+
+	/* and that all endpoints are dual-speed */
+	//hs_source_desc.bEndpointAddress = fs_source_desc.bEndpointAddress;
+	//hs_sink_desc.bEndpointAddress = fs_sink_desc.bEndpointAddress;
+#endif
+
+	usb_gadget_set_selfpowered (gadget);
+
+	init_timer (&dev->resume);
+	dev->resume.function = zero_autoresume;
+	dev->resume.data = (unsigned long) dev;
+
+	gadget->ep0->driver_data = dev;
+
+	INFO (dev, "%s, version: " DRIVER_VERSION "\n", longname);
+	INFO (dev, "using %s, OUT %s IN %s\n", gadget->name,
+		EP_OUT_NAME, EP_IN_NAME);
+
+	snprintf (manufacturer, sizeof manufacturer,
+		UTS_SYSNAME " " UTS_RELEASE " with %s",
+		gadget->name);
+
+	return 0;
+
+enomem:
+	zero_unbind (gadget);
+	return -ENOMEM;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void
+zero_suspend (struct usb_gadget *gadget)
+{
+	struct zero_dev		*dev = get_gadget_data (gadget);
+
+	if (gadget->speed == USB_SPEED_UNKNOWN)
+		return;
+
+	if (autoresume) {
+		mod_timer (&dev->resume, jiffies + (HZ * autoresume));
+		DBG (dev, "suspend, wakeup in %d seconds\n", autoresume);
+	} else
+		DBG (dev, "suspend\n");
+}
+
+static void
+zero_resume (struct usb_gadget *gadget)
+{
+	struct zero_dev		*dev = get_gadget_data (gadget);
+
+	DBG (dev, "resume\n");
+	del_timer (&dev->resume);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static struct usb_gadget_driver zero_driver = {
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+	.speed		= USB_SPEED_HIGH,
+#else
+	.speed		= USB_SPEED_FULL,
+#endif
+	.function	= (char *) longname,
+	.bind		= zero_bind,
+	.unbind		= zero_unbind,
+
+	.setup		= zero_setup,
+	.disconnect	= zero_disconnect,
+
+	.suspend	= zero_suspend,
+	.resume		= zero_resume,
+
+	.driver 	= {
+		.name		= (char *) shortname,
+		// .shutdown = ...
+		// .suspend = ...
+		// .resume = ...
+	},
+};
+
+MODULE_AUTHOR ("David Brownell");
+MODULE_LICENSE ("Dual BSD/GPL");
+
+static struct proc_dir_entry *pdir, *pfile;
+
+static int isoc_read_data (char *page, char **start,
+			   off_t off, int count,
+			   int *eof, void *data)
+{
+	int i;
+	static int c = 0;
+	static int done = 0;
+	static int s = 0;
+
+/*
+	printk ("\ncount: %d\n", count);
+	printk ("rbuf_start: %d\n", rbuf_start);
+	printk ("rbuf_len: %d\n", rbuf_len);
+	printk ("off: %d\n", off);
+	printk ("start: %p\n\n", *start);
+*/
+	if (done) {
+		c = 0;
+		done = 0;
+		*eof = 1;
+		return 0;
+	}
+
+	if (c == 0) {
+		if (rbuf_len == RBUF_LEN)
+			s = rbuf_start;
+		else s = 0;
+	}
+
+	for (i=0; i<count && c<rbuf_len; i++, c++) {
+		page[i] = rbuf[(c+s) % RBUF_LEN];
+	}
+	*start = page;
+	
+	if (c >= rbuf_len) {
+		*eof = 1;
+		done = 1;
+	}
+
+
+	return i;
+}
+
+static int __init init (void)
+{
+
+	int retval = 0;
+
+	pdir = proc_mkdir("isoc_test", NULL);
+	if(pdir == NULL) {
+		retval = -ENOMEM;
+		printk("Error creating dir\n");
+		goto done;
+	}
+	pdir->owner = THIS_MODULE;
+
+	pfile = create_proc_read_entry("isoc_data",
+				       0444, pdir,
+				       isoc_read_data,
+				       NULL);
+	if (pfile == NULL) {
+		retval = -ENOMEM;
+		printk("Error creating file\n");
+		goto no_file;
+	}
+	pfile->owner = THIS_MODULE;
+
+	return usb_gadget_register_driver (&zero_driver);
+
+ no_file:
+	remove_proc_entry("isoc_data", NULL);
+ done:
+	return retval;
+}
+module_init (init);
+
+static void __exit cleanup (void)
+{
+
+	usb_gadget_unregister_driver (&zero_driver);
+	
+	remove_proc_entry("isoc_data", pdir);
+	remove_proc_entry("isoc_test", NULL);
+}
+module_exit (cleanup);