Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 2555 insertions, 0 deletions

diff --git a/qemu/roms/u-boot/drivers/usb/gadget/ether.c b/qemu/roms/u-boot/drivers/usb/gadget/ether.c
new file mode 100644
index 000000000..cc6cc1f32
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/usb/gadget/ether.c
@@ -0,0 +1,2555 @@
+/*
+ * ether.c -- Ethernet gadget driver, with CDC and non-CDC options
+ *
+ * Copyright (C) 2003-2005,2008 David Brownell
+ * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/errno.h>
+#include <linux/netdevice.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/cdc.h>
+#include <linux/usb/gadget.h>
+#include <net.h>
+#include <malloc.h>
+#include <linux/ctype.h>
+
+#include "gadget_chips.h"
+#include "rndis.h"
+
+#define USB_NET_NAME "usb_ether"
+
+#define atomic_read
+extern struct platform_data brd;
+#define spin_lock(x)
+#define spin_unlock(x)
+
+
+unsigned packet_received, packet_sent;
+
+#define GFP_ATOMIC ((gfp_t) 0)
+#define GFP_KERNEL ((gfp_t) 0)
+
+/*
+ * Ethernet gadget driver -- with CDC and non-CDC options
+ * Builds on hardware support for a full duplex link.
+ *
+ * CDC Ethernet is the standard USB solution for sending Ethernet frames
+ * using USB.  Real hardware tends to use the same framing protocol but look
+ * different for control features.  This driver strongly prefers to use
+ * this USB-IF standard as its open-systems interoperability solution;
+ * most host side USB stacks (except from Microsoft) support it.
+ *
+ * This is sometimes called "CDC ECM" (Ethernet Control Model) to support
+ * TLA-soup.  "CDC ACM" (Abstract Control Model) is for modems, and a new
+ * "CDC EEM" (Ethernet Emulation Model) is starting to spread.
+ *
+ * There's some hardware that can't talk CDC ECM.  We make that hardware
+ * implement a "minimalist" vendor-agnostic CDC core:  same framing, but
+ * link-level setup only requires activating the configuration.  Only the
+ * endpoint descriptors, and product/vendor IDs, are relevant; no control
+ * operations are available.  Linux supports it, but other host operating
+ * systems may not.  (This is a subset of CDC Ethernet.)
+ *
+ * It turns out that if you add a few descriptors to that "CDC Subset",
+ * (Windows) host side drivers from MCCI can treat it as one submode of
+ * a proprietary scheme called "SAFE" ... without needing to know about
+ * specific product/vendor IDs.  So we do that, making it easier to use
+ * those MS-Windows drivers.  Those added descriptors make it resemble a
+ * CDC MDLM device, but they don't change device behavior at all.  (See
+ * MCCI Engineering report 950198 "SAFE Networking Functions".)
+ *
+ * A third option is also in use.  Rather than CDC Ethernet, or something
+ * simpler, Microsoft pushes their own approach: RNDIS.  The published
+ * RNDIS specs are ambiguous and appear to be incomplete, and are also
+ * needlessly complex.  They borrow more from CDC ACM than CDC ECM.
+ */
+#define ETH_ALEN	6		/* Octets in one ethernet addr	 */
+#define ETH_HLEN	14		/* Total octets in header.	 */
+#define ETH_ZLEN	60		/* Min. octets in frame sans FCS */
+#define ETH_DATA_LEN	1500		/* Max. octets in payload	 */
+#define ETH_FRAME_LEN	PKTSIZE_ALIGN	/* Max. octets in frame sans FCS */
+#define ETH_FCS_LEN	4		/* Octets in the FCS		 */
+
+#define DRIVER_DESC		"Ethernet Gadget"
+/* Based on linux 2.6.27 version */
+#define DRIVER_VERSION		"May Day 2005"
+
+static const char shortname[] = "ether";
+static const char driver_desc[] = DRIVER_DESC;
+
+#define RX_EXTRA	20		/* guard against rx overflows */
+
+#ifndef	CONFIG_USB_ETH_RNDIS
+#define rndis_uninit(x)		do {} while (0)
+#define rndis_deregister(c)	do {} while (0)
+#define rndis_exit()		do {} while (0)
+#endif
+
+/* CDC and RNDIS support the same host-chosen outgoing packet filters. */
+#define	DEFAULT_FILTER	(USB_CDC_PACKET_TYPE_BROADCAST \
+			|USB_CDC_PACKET_TYPE_ALL_MULTICAST \
+			|USB_CDC_PACKET_TYPE_PROMISCUOUS \
+			|USB_CDC_PACKET_TYPE_DIRECTED)
+
+#define USB_CONNECT_TIMEOUT (3 * CONFIG_SYS_HZ)
+
+/*-------------------------------------------------------------------------*/
+
+struct eth_dev {
+	struct usb_gadget	*gadget;
+	struct usb_request	*req;		/* for control responses */
+	struct usb_request	*stat_req;	/* for cdc & rndis status */
+
+	u8			config;
+	struct usb_ep		*in_ep, *out_ep, *status_ep;
+	const struct usb_endpoint_descriptor
+				*in, *out, *status;
+
+	struct usb_request	*tx_req, *rx_req;
+
+	struct eth_device	*net;
+	struct net_device_stats	stats;
+	unsigned int		tx_qlen;
+
+	unsigned		zlp:1;
+	unsigned		cdc:1;
+	unsigned		rndis:1;
+	unsigned		suspended:1;
+	unsigned		network_started:1;
+	u16			cdc_filter;
+	unsigned long		todo;
+	int			mtu;
+#define	WORK_RX_MEMORY		0
+	int			rndis_config;
+	u8			host_mac[ETH_ALEN];
+};
+
+/*
+ * This version autoconfigures as much as possible at run-time.
+ *
+ * It also ASSUMES a self-powered device, without remote wakeup,
+ * although remote wakeup support would make sense.
+ */
+
+/*-------------------------------------------------------------------------*/
+static struct eth_dev l_ethdev;
+static struct eth_device l_netdev;
+static struct usb_gadget_driver eth_driver;
+
+/*-------------------------------------------------------------------------*/
+
+/* "main" config is either CDC, or its simple subset */
+static inline int is_cdc(struct eth_dev *dev)
+{
+#if	!defined(CONFIG_USB_ETH_SUBSET)
+	return 1;		/* only cdc possible */
+#elif	!defined(CONFIG_USB_ETH_CDC)
+	return 0;		/* only subset possible */
+#else
+	return dev->cdc;	/* depends on what hardware we found */
+#endif
+}
+
+/* "secondary" RNDIS config may sometimes be activated */
+static inline int rndis_active(struct eth_dev *dev)
+{
+#ifdef	CONFIG_USB_ETH_RNDIS
+	return dev->rndis;
+#else
+	return 0;
+#endif
+}
+
+#define	subset_active(dev)	(!is_cdc(dev) && !rndis_active(dev))
+#define	cdc_active(dev)		(is_cdc(dev) && !rndis_active(dev))
+
+#define DEFAULT_QLEN	2	/* double buffering by default */
+
+/* peak bulk transfer bits-per-second */
+#define	HS_BPS		(13 * 512 * 8 * 1000 * 8)
+#define	FS_BPS		(19 *  64 * 1 * 1000 * 8)
+
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+#define	DEVSPEED	USB_SPEED_HIGH
+
+#ifdef CONFIG_USB_ETH_QMULT
+#define qmult CONFIG_USB_ETH_QMULT
+#else
+#define qmult 5
+#endif
+
+/* for dual-speed hardware, use deeper queues at highspeed */
+#define qlen(gadget) \
+	(DEFAULT_QLEN*((gadget->speed == USB_SPEED_HIGH) ? qmult : 1))
+
+static inline int BITRATE(struct usb_gadget *g)
+{
+	return (g->speed == USB_SPEED_HIGH) ? HS_BPS : FS_BPS;
+}
+
+#else	/* full speed (low speed doesn't do bulk) */
+
+#define qmult		1
+
+#define	DEVSPEED	USB_SPEED_FULL
+
+#define qlen(gadget) DEFAULT_QLEN
+
+static inline int BITRATE(struct usb_gadget *g)
+{
+	return FS_BPS;
+}
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
+ * Instead:  allocate your own, using normal USB-IF procedures.
+ */
+
+/*
+ * Thanks to NetChip Technologies for donating this product ID.
+ * It's for devices with only CDC Ethernet configurations.
+ */
+#define CDC_VENDOR_NUM		0x0525	/* NetChip */
+#define CDC_PRODUCT_NUM		0xa4a1	/* Linux-USB Ethernet Gadget */
+
+/*
+ * For hardware that can't talk CDC, we use the same vendor ID that
+ * ARM Linux has used for ethernet-over-usb, both with sa1100 and
+ * with pxa250.  We're protocol-compatible, if the host-side drivers
+ * use the endpoint descriptors.  bcdDevice (version) is nonzero, so
+ * drivers that need to hard-wire endpoint numbers have a hook.
+ *
+ * The protocol is a minimal subset of CDC Ether, which works on any bulk
+ * hardware that's not deeply broken ... even on hardware that can't talk
+ * RNDIS (like SA-1100, with no interrupt endpoint, or anything that
+ * doesn't handle control-OUT).
+ */
+#define	SIMPLE_VENDOR_NUM	0x049f	/* Compaq Computer Corp. */
+#define	SIMPLE_PRODUCT_NUM	0x505a	/* Linux-USB "CDC Subset" Device */
+
+/*
+ * For hardware that can talk RNDIS and either of the above protocols,
+ * use this ID ... the windows INF files will know it.  Unless it's
+ * used with CDC Ethernet, Linux 2.4 hosts will need updates to choose
+ * the non-RNDIS configuration.
+ */
+#define RNDIS_VENDOR_NUM	0x0525	/* NetChip */
+#define RNDIS_PRODUCT_NUM	0xa4a2	/* Ethernet/RNDIS Gadget */
+
+/*
+ * Some systems will want different product identifers published in the
+ * device descriptor, either numbers or strings or both.  These string
+ * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
+ */
+
+/*
+ * Emulating them in eth_bind:
+ * static ushort idVendor;
+ * static ushort idProduct;
+ */
+
+#if defined(CONFIG_USBNET_MANUFACTURER)
+static char *iManufacturer = CONFIG_USBNET_MANUFACTURER;
+#else
+static char *iManufacturer = "U-boot";
+#endif
+
+/* These probably need to be configurable. */
+static ushort bcdDevice;
+static char *iProduct;
+static char *iSerialNumber;
+
+static char dev_addr[18];
+
+static char host_addr[18];
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * USB DRIVER HOOKUP (to the hardware driver, below us), mostly
+ * ep0 implementation:  descriptors, config management, setup().
+ * also optional class-specific notification interrupt transfer.
+ */
+
+/*
+ * DESCRIPTORS ... most are static, but strings and (full) configuration
+ * descriptors are built on demand.  For now we do either full CDC, or
+ * our simple subset, with RNDIS as an optional second configuration.
+ *
+ * RNDIS includes some CDC ACM descriptors ... like CDC Ethernet.  But
+ * the class descriptors match a modem (they're ignored; it's really just
+ * Ethernet functionality), they don't need the NOP altsetting, and the
+ * status transfer endpoint isn't optional.
+ */
+
+#define STRING_MANUFACTURER		1
+#define STRING_PRODUCT			2
+#define STRING_ETHADDR			3
+#define STRING_DATA			4
+#define STRING_CONTROL			5
+#define STRING_RNDIS_CONTROL		6
+#define STRING_CDC			7
+#define STRING_SUBSET			8
+#define STRING_RNDIS			9
+#define STRING_SERIALNUMBER		10
+
+/* holds our biggest descriptor (or RNDIS response) */
+#define USB_BUFSIZ	256
+
+/*
+ * This device advertises one configuration, eth_config, unless RNDIS
+ * is enabled (rndis_config) on hardware supporting at least two configs.
+ *
+ * NOTE:  Controllers like superh_udc should probably be able to use
+ * an RNDIS-only configuration.
+ *
+ * FIXME define some higher-powered configurations to make it easier
+ * to recharge batteries ...
+ */
+
+#define DEV_CONFIG_VALUE	1	/* cdc or subset */
+#define DEV_RNDIS_CONFIG_VALUE	2	/* rndis; optional */
+
+static struct usb_device_descriptor
+device_desc = {
+	.bLength =		sizeof device_desc,
+	.bDescriptorType =	USB_DT_DEVICE,
+
+	.bcdUSB =		__constant_cpu_to_le16(0x0200),
+
+	.bDeviceClass =		USB_CLASS_COMM,
+	.bDeviceSubClass =	0,
+	.bDeviceProtocol =	0,
+
+	.idVendor =		__constant_cpu_to_le16(CDC_VENDOR_NUM),
+	.idProduct =		__constant_cpu_to_le16(CDC_PRODUCT_NUM),
+	.iManufacturer =	STRING_MANUFACTURER,
+	.iProduct =		STRING_PRODUCT,
+	.bNumConfigurations =	1,
+};
+
+static struct usb_otg_descriptor
+otg_descriptor = {
+	.bLength =		sizeof otg_descriptor,
+	.bDescriptorType =	USB_DT_OTG,
+
+	.bmAttributes =		USB_OTG_SRP,
+};
+
+static struct usb_config_descriptor
+eth_config = {
+	.bLength =		sizeof eth_config,
+	.bDescriptorType =	USB_DT_CONFIG,
+
+	/* compute wTotalLength on the fly */
+	.bNumInterfaces =	2,
+	.bConfigurationValue =	DEV_CONFIG_VALUE,
+	.iConfiguration =	STRING_CDC,
+	.bmAttributes =		USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
+	.bMaxPower =		1,
+};
+
+#ifdef	CONFIG_USB_ETH_RNDIS
+static struct usb_config_descriptor
+rndis_config = {
+	.bLength =              sizeof rndis_config,
+	.bDescriptorType =      USB_DT_CONFIG,
+
+	/* compute wTotalLength on the fly */
+	.bNumInterfaces =       2,
+	.bConfigurationValue =  DEV_RNDIS_CONFIG_VALUE,
+	.iConfiguration =       STRING_RNDIS,
+	.bmAttributes =		USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
+	.bMaxPower =            1,
+};
+#endif
+
+/*
+ * Compared to the simple CDC subset, the full CDC Ethernet model adds
+ * three class descriptors, two interface descriptors, optional status
+ * endpoint.  Both have a "data" interface and two bulk endpoints.
+ * There are also differences in how control requests are handled.
+ *
+ * RNDIS shares a lot with CDC-Ethernet, since it's a variant of the
+ * CDC-ACM (modem) spec.  Unfortunately MSFT's RNDIS driver is buggy; it
+ * may hang or oops.  Since bugfixes (or accurate specs, letting Linux
+ * work around those bugs) are unlikely to ever come from MSFT, you may
+ * wish to avoid using RNDIS.
+ *
+ * MCCI offers an alternative to RNDIS if you need to connect to Windows
+ * but have hardware that can't support CDC Ethernet.   We add descriptors
+ * to present the CDC Subset as a (nonconformant) CDC MDLM variant called
+ * "SAFE".  That borrows from both CDC Ethernet and CDC MDLM.  You can
+ * get those drivers from MCCI, or bundled with various products.
+ */
+
+#ifdef	CONFIG_USB_ETH_CDC
+static struct usb_interface_descriptor
+control_intf = {
+	.bLength =		sizeof control_intf,
+	.bDescriptorType =	USB_DT_INTERFACE,
+
+	.bInterfaceNumber =	0,
+	/* status endpoint is optional; this may be patched later */
+	.bNumEndpoints =	1,
+	.bInterfaceClass =	USB_CLASS_COMM,
+	.bInterfaceSubClass =	USB_CDC_SUBCLASS_ETHERNET,
+	.bInterfaceProtocol =	USB_CDC_PROTO_NONE,
+	.iInterface =		STRING_CONTROL,
+};
+#endif
+
+#ifdef	CONFIG_USB_ETH_RNDIS
+static const struct usb_interface_descriptor
+rndis_control_intf = {
+	.bLength =              sizeof rndis_control_intf,
+	.bDescriptorType =      USB_DT_INTERFACE,
+
+	.bInterfaceNumber =     0,
+	.bNumEndpoints =        1,
+	.bInterfaceClass =      USB_CLASS_COMM,
+	.bInterfaceSubClass =   USB_CDC_SUBCLASS_ACM,
+	.bInterfaceProtocol =   USB_CDC_ACM_PROTO_VENDOR,
+	.iInterface =           STRING_RNDIS_CONTROL,
+};
+#endif
+
+static const struct usb_cdc_header_desc header_desc = {
+	.bLength =		sizeof header_desc,
+	.bDescriptorType =	USB_DT_CS_INTERFACE,
+	.bDescriptorSubType =	USB_CDC_HEADER_TYPE,
+
+	.bcdCDC =		__constant_cpu_to_le16(0x0110),
+};
+
+#if defined(CONFIG_USB_ETH_CDC) || defined(CONFIG_USB_ETH_RNDIS)
+
+static const struct usb_cdc_union_desc union_desc = {
+	.bLength =		sizeof union_desc,
+	.bDescriptorType =	USB_DT_CS_INTERFACE,
+	.bDescriptorSubType =	USB_CDC_UNION_TYPE,
+
+	.bMasterInterface0 =	0,	/* index of control interface */
+	.bSlaveInterface0 =	1,	/* index of DATA interface */
+};
+
+#endif	/* CDC || RNDIS */
+
+#ifdef	CONFIG_USB_ETH_RNDIS
+
+static const struct usb_cdc_call_mgmt_descriptor call_mgmt_descriptor = {
+	.bLength =		sizeof call_mgmt_descriptor,
+	.bDescriptorType =	USB_DT_CS_INTERFACE,
+	.bDescriptorSubType =	USB_CDC_CALL_MANAGEMENT_TYPE,
+
+	.bmCapabilities =	0x00,
+	.bDataInterface =	0x01,
+};
+
+static const struct usb_cdc_acm_descriptor acm_descriptor = {
+	.bLength =		sizeof acm_descriptor,
+	.bDescriptorType =	USB_DT_CS_INTERFACE,
+	.bDescriptorSubType =	USB_CDC_ACM_TYPE,
+
+	.bmCapabilities =	0x00,
+};
+
+#endif
+
+#ifndef CONFIG_USB_ETH_CDC
+
+/*
+ * "SAFE" loosely follows CDC WMC MDLM, violating the spec in various
+ * ways:  data endpoints live in the control interface, there's no data
+ * interface, and it's not used to talk to a cell phone radio.
+ */
+
+static const struct usb_cdc_mdlm_desc mdlm_desc = {
+	.bLength =		sizeof mdlm_desc,
+	.bDescriptorType =	USB_DT_CS_INTERFACE,
+	.bDescriptorSubType =	USB_CDC_MDLM_TYPE,
+
+	.bcdVersion =		__constant_cpu_to_le16(0x0100),
+	.bGUID = {
+		0x5d, 0x34, 0xcf, 0x66, 0x11, 0x18, 0x11, 0xd6,
+		0xa2, 0x1a, 0x00, 0x01, 0x02, 0xca, 0x9a, 0x7f,
+	},
+};
+
+/*
+ * since "usb_cdc_mdlm_detail_desc" is a variable length structure, we
+ * can't really use its struct.  All we do here is say that we're using
+ * the submode of "SAFE" which directly matches the CDC Subset.
+ */
+static const u8 mdlm_detail_desc[] = {
+	6,
+	USB_DT_CS_INTERFACE,
+	USB_CDC_MDLM_DETAIL_TYPE,
+
+	0,	/* "SAFE" */
+	0,	/* network control capabilities (none) */
+	0,	/* network data capabilities ("raw" encapsulation) */
+};
+
+#endif
+
+static const struct usb_cdc_ether_desc ether_desc = {
+	.bLength =		sizeof(ether_desc),
+	.bDescriptorType =	USB_DT_CS_INTERFACE,
+	.bDescriptorSubType =	USB_CDC_ETHERNET_TYPE,
+
+	/* this descriptor actually adds value, surprise! */
+	.iMACAddress =		STRING_ETHADDR,
+	.bmEthernetStatistics = __constant_cpu_to_le32(0), /* no statistics */
+	.wMaxSegmentSize =	__constant_cpu_to_le16(ETH_FRAME_LEN),
+	.wNumberMCFilters =	__constant_cpu_to_le16(0),
+	.bNumberPowerFilters =	0,
+};
+
+#if defined(CONFIG_USB_ETH_CDC) || defined(CONFIG_USB_ETH_RNDIS)
+
+/*
+ * include the status endpoint if we can, even where it's optional.
+ * use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one
+ * packet, to simplify cancellation; and a big transfer interval, to
+ * waste less bandwidth.
+ *
+ * some drivers (like Linux 2.4 cdc-ether!) "need" it to exist even
+ * if they ignore the connect/disconnect notifications that real aether
+ * can provide.  more advanced cdc configurations might want to support
+ * encapsulated commands (vendor-specific, using control-OUT).
+ *
+ * RNDIS requires the status endpoint, since it uses that encapsulation
+ * mechanism for its funky RPC scheme.
+ */
+
+#define LOG2_STATUS_INTERVAL_MSEC	5	/* 1 << 5 == 32 msec */
+#define STATUS_BYTECOUNT		16	/* 8 byte header + data */
+
+static struct usb_endpoint_descriptor
+fs_status_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bEndpointAddress =	USB_DIR_IN,
+	.bmAttributes =		USB_ENDPOINT_XFER_INT,
+	.wMaxPacketSize =	__constant_cpu_to_le16(STATUS_BYTECOUNT),
+	.bInterval =		1 << LOG2_STATUS_INTERVAL_MSEC,
+};
+#endif
+
+#ifdef	CONFIG_USB_ETH_CDC
+
+/* the default data interface has no endpoints ... */
+
+static const struct usb_interface_descriptor
+data_nop_intf = {
+	.bLength =		sizeof data_nop_intf,
+	.bDescriptorType =	USB_DT_INTERFACE,
+
+	.bInterfaceNumber =	1,
+	.bAlternateSetting =	0,
+	.bNumEndpoints =	0,
+	.bInterfaceClass =	USB_CLASS_CDC_DATA,
+	.bInterfaceSubClass =	0,
+	.bInterfaceProtocol =	0,
+};
+
+/* ... but the "real" data interface has two bulk endpoints */
+
+static const struct usb_interface_descriptor
+data_intf = {
+	.bLength =		sizeof data_intf,
+	.bDescriptorType =	USB_DT_INTERFACE,
+
+	.bInterfaceNumber =	1,
+	.bAlternateSetting =	1,
+	.bNumEndpoints =	2,
+	.bInterfaceClass =	USB_CLASS_CDC_DATA,
+	.bInterfaceSubClass =	0,
+	.bInterfaceProtocol =	0,
+	.iInterface =		STRING_DATA,
+};
+
+#endif
+
+#ifdef	CONFIG_USB_ETH_RNDIS
+
+/* RNDIS doesn't activate by changing to the "real" altsetting */
+
+static const struct usb_interface_descriptor
+rndis_data_intf = {
+	.bLength =		sizeof rndis_data_intf,
+	.bDescriptorType =	USB_DT_INTERFACE,
+
+	.bInterfaceNumber =	1,
+	.bAlternateSetting =	0,
+	.bNumEndpoints =	2,
+	.bInterfaceClass =	USB_CLASS_CDC_DATA,
+	.bInterfaceSubClass =	0,
+	.bInterfaceProtocol =	0,
+	.iInterface =		STRING_DATA,
+};
+
+#endif
+
+#ifdef CONFIG_USB_ETH_SUBSET
+
+/*
+ * "Simple" CDC-subset option is a simple vendor-neutral model that most
+ * full speed controllers can handle:  one interface, two bulk endpoints.
+ *
+ * To assist host side drivers, we fancy it up a bit, and add descriptors
+ * so some host side drivers will understand it as a "SAFE" variant.
+ */
+
+static const struct usb_interface_descriptor
+subset_data_intf = {
+	.bLength =		sizeof subset_data_intf,
+	.bDescriptorType =	USB_DT_INTERFACE,
+
+	.bInterfaceNumber =	0,
+	.bAlternateSetting =	0,
+	.bNumEndpoints =	2,
+	.bInterfaceClass =      USB_CLASS_COMM,
+	.bInterfaceSubClass =	USB_CDC_SUBCLASS_MDLM,
+	.bInterfaceProtocol =	0,
+	.iInterface =		STRING_DATA,
+};
+
+#endif	/* SUBSET */
+
+static struct usb_endpoint_descriptor
+fs_source_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bEndpointAddress =	USB_DIR_IN,
+	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize =	__constant_cpu_to_le16(64),
+};
+
+static struct usb_endpoint_descriptor
+fs_sink_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bEndpointAddress =	USB_DIR_OUT,
+	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize =	__constant_cpu_to_le16(64),
+};
+
+static const struct usb_descriptor_header *fs_eth_function[11] = {
+	(struct usb_descriptor_header *) &otg_descriptor,
+#ifdef CONFIG_USB_ETH_CDC
+	/* "cdc" mode descriptors */
+	(struct usb_descriptor_header *) &control_intf,
+	(struct usb_descriptor_header *) &header_desc,
+	(struct usb_descriptor_header *) &union_desc,
+	(struct usb_descriptor_header *) &ether_desc,
+	/* NOTE: status endpoint may need to be removed */
+	(struct usb_descriptor_header *) &fs_status_desc,
+	/* data interface, with altsetting */
+	(struct usb_descriptor_header *) &data_nop_intf,
+	(struct usb_descriptor_header *) &data_intf,
+	(struct usb_descriptor_header *) &fs_source_desc,
+	(struct usb_descriptor_header *) &fs_sink_desc,
+	NULL,
+#endif /* CONFIG_USB_ETH_CDC */
+};
+
+static inline void fs_subset_descriptors(void)
+{
+#ifdef CONFIG_USB_ETH_SUBSET
+	/* behavior is "CDC Subset"; extra descriptors say "SAFE" */
+	fs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
+	fs_eth_function[2] = (struct usb_descriptor_header *) &header_desc;
+	fs_eth_function[3] = (struct usb_descriptor_header *) &mdlm_desc;
+	fs_eth_function[4] = (struct usb_descriptor_header *) &mdlm_detail_desc;
+	fs_eth_function[5] = (struct usb_descriptor_header *) &ether_desc;
+	fs_eth_function[6] = (struct usb_descriptor_header *) &fs_source_desc;
+	fs_eth_function[7] = (struct usb_descriptor_header *) &fs_sink_desc;
+	fs_eth_function[8] = NULL;
+#else
+	fs_eth_function[1] = NULL;
+#endif
+}
+
+#ifdef	CONFIG_USB_ETH_RNDIS
+static const struct usb_descriptor_header *fs_rndis_function[] = {
+	(struct usb_descriptor_header *) &otg_descriptor,
+	/* control interface matches ACM, not Ethernet */
+	(struct usb_descriptor_header *) &rndis_control_intf,
+	(struct usb_descriptor_header *) &header_desc,
+	(struct usb_descriptor_header *) &call_mgmt_descriptor,
+	(struct usb_descriptor_header *) &acm_descriptor,
+	(struct usb_descriptor_header *) &union_desc,
+	(struct usb_descriptor_header *) &fs_status_desc,
+	/* data interface has no altsetting */
+	(struct usb_descriptor_header *) &rndis_data_intf,
+	(struct usb_descriptor_header *) &fs_source_desc,
+	(struct usb_descriptor_header *) &fs_sink_desc,
+	NULL,
+};
+#endif
+
+/*
+ * usb 2.0 devices need to expose both high speed and full speed
+ * descriptors, unless they only run at full speed.
+ */
+
+#if defined(CONFIG_USB_ETH_CDC) || defined(CONFIG_USB_ETH_RNDIS)
+static struct usb_endpoint_descriptor
+hs_status_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bmAttributes =		USB_ENDPOINT_XFER_INT,
+	.wMaxPacketSize =	__constant_cpu_to_le16(STATUS_BYTECOUNT),
+	.bInterval =		LOG2_STATUS_INTERVAL_MSEC + 4,
+};
+#endif /* CONFIG_USB_ETH_CDC */
+
+static struct usb_endpoint_descriptor
+hs_source_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize =	__constant_cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor
+hs_sink_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize =	__constant_cpu_to_le16(512),
+};
+
+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_COMM,
+
+	.bNumConfigurations =	1,
+};
+
+static const struct usb_descriptor_header *hs_eth_function[11] = {
+	(struct usb_descriptor_header *) &otg_descriptor,
+#ifdef CONFIG_USB_ETH_CDC
+	/* "cdc" mode descriptors */
+	(struct usb_descriptor_header *) &control_intf,
+	(struct usb_descriptor_header *) &header_desc,
+	(struct usb_descriptor_header *) &union_desc,
+	(struct usb_descriptor_header *) &ether_desc,
+	/* NOTE: status endpoint may need to be removed */
+	(struct usb_descriptor_header *) &hs_status_desc,
+	/* data interface, with altsetting */
+	(struct usb_descriptor_header *) &data_nop_intf,
+	(struct usb_descriptor_header *) &data_intf,
+	(struct usb_descriptor_header *) &hs_source_desc,
+	(struct usb_descriptor_header *) &hs_sink_desc,
+	NULL,
+#endif /* CONFIG_USB_ETH_CDC */
+};
+
+static inline void hs_subset_descriptors(void)
+{
+#ifdef CONFIG_USB_ETH_SUBSET
+	/* behavior is "CDC Subset"; extra descriptors say "SAFE" */
+	hs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
+	hs_eth_function[2] = (struct usb_descriptor_header *) &header_desc;
+	hs_eth_function[3] = (struct usb_descriptor_header *) &mdlm_desc;
+	hs_eth_function[4] = (struct usb_descriptor_header *) &mdlm_detail_desc;
+	hs_eth_function[5] = (struct usb_descriptor_header *) &ether_desc;
+	hs_eth_function[6] = (struct usb_descriptor_header *) &hs_source_desc;
+	hs_eth_function[7] = (struct usb_descriptor_header *) &hs_sink_desc;
+	hs_eth_function[8] = NULL;
+#else
+	hs_eth_function[1] = NULL;
+#endif
+}
+
+#ifdef	CONFIG_USB_ETH_RNDIS
+static const struct usb_descriptor_header *hs_rndis_function[] = {
+	(struct usb_descriptor_header *) &otg_descriptor,
+	/* control interface matches ACM, not Ethernet */
+	(struct usb_descriptor_header *) &rndis_control_intf,
+	(struct usb_descriptor_header *) &header_desc,
+	(struct usb_descriptor_header *) &call_mgmt_descriptor,
+	(struct usb_descriptor_header *) &acm_descriptor,
+	(struct usb_descriptor_header *) &union_desc,
+	(struct usb_descriptor_header *) &hs_status_desc,
+	/* data interface has no altsetting */
+	(struct usb_descriptor_header *) &rndis_data_intf,
+	(struct usb_descriptor_header *) &hs_source_desc,
+	(struct usb_descriptor_header *) &hs_sink_desc,
+	NULL,
+};
+#endif
+
+
+/* maxpacket and other transfer characteristics vary by speed. */
+static inline struct usb_endpoint_descriptor *
+ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *hs,
+		struct usb_endpoint_descriptor *fs)
+{
+	if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
+		return hs;
+	return fs;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* descriptors that are built on-demand */
+
+static char manufacturer[50];
+static char product_desc[40] = DRIVER_DESC;
+static char serial_number[20];
+
+/* address that the host will use ... usually assigned at random */
+static char ethaddr[2 * ETH_ALEN + 1];
+
+/* static strings, in UTF-8 */
+static struct usb_string		strings[] = {
+	{ STRING_MANUFACTURER,	manufacturer, },
+	{ STRING_PRODUCT,	product_desc, },
+	{ STRING_SERIALNUMBER,	serial_number, },
+	{ STRING_DATA,		"Ethernet Data", },
+	{ STRING_ETHADDR,	ethaddr, },
+#ifdef	CONFIG_USB_ETH_CDC
+	{ STRING_CDC,		"CDC Ethernet", },
+	{ STRING_CONTROL,	"CDC Communications Control", },
+#endif
+#ifdef	CONFIG_USB_ETH_SUBSET
+	{ STRING_SUBSET,	"CDC Ethernet Subset", },
+#endif
+#ifdef	CONFIG_USB_ETH_RNDIS
+	{ STRING_RNDIS,		"RNDIS", },
+	{ STRING_RNDIS_CONTROL,	"RNDIS Communications Control", },
+#endif
+	{  }		/* end of list */
+};
+
+static struct usb_gadget_strings	stringtab = {
+	.language	= 0x0409,	/* en-us */
+	.strings	= strings,
+};
+
+/*============================================================================*/
+DEFINE_CACHE_ALIGN_BUFFER(u8, control_req, USB_BUFSIZ);
+
+#if defined(CONFIG_USB_ETH_CDC) || defined(CONFIG_USB_ETH_RNDIS)
+DEFINE_CACHE_ALIGN_BUFFER(u8, status_req, STATUS_BYTECOUNT);
+#endif
+
+
+/**
+ * strlcpy - Copy a %NUL terminated string into a sized buffer
+ * @dest: Where to copy the string to
+ * @src: Where to copy the string from
+ * @size: size of destination buffer
+ *
+ * Compatible with *BSD: the result is always a valid
+ * NUL-terminated string that fits in the buffer (unless,
+ * of course, the buffer size is zero). It does not pad
+ * out the result like strncpy() does.
+ */
+size_t strlcpy(char *dest, const char *src, size_t size)
+{
+	size_t ret = strlen(src);
+
+	if (size) {
+		size_t len = (ret >= size) ? size - 1 : ret;
+		memcpy(dest, src, len);
+		dest[len] = '\0';
+	}
+	return ret;
+}
+
+/*============================================================================*/
+
+/*
+ * one config, two interfaces:  control, data.
+ * complications: class descriptors, and an altsetting.
+ */
+static int
+config_buf(struct usb_gadget *g, u8 *buf, u8 type, unsigned index, int is_otg)
+{
+	int					len;
+	const struct usb_config_descriptor	*config;
+	const struct usb_descriptor_header	**function;
+	int					hs = 0;
+
+	if (gadget_is_dualspeed(g)) {
+		hs = (g->speed == USB_SPEED_HIGH);
+		if (type == USB_DT_OTHER_SPEED_CONFIG)
+			hs = !hs;
+	}
+#define which_fn(t)	(hs ? hs_ ## t ## _function : fs_ ## t ## _function)
+
+	if (index >= device_desc.bNumConfigurations)
+		return -EINVAL;
+
+#ifdef	CONFIG_USB_ETH_RNDIS
+	/*
+	 * list the RNDIS config first, to make Microsoft's drivers
+	 * happy. DOCSIS 1.0 needs this too.
+	 */
+	if (device_desc.bNumConfigurations == 2 && index == 0) {
+		config = &rndis_config;
+		function = which_fn(rndis);
+	} else
+#endif
+	{
+		config = &eth_config;
+		function = which_fn(eth);
+	}
+
+	/* for now, don't advertise srp-only devices */
+	if (!is_otg)
+		function++;
+
+	len = usb_gadget_config_buf(config, buf, USB_BUFSIZ, function);
+	if (len < 0)
+		return len;
+	((struct usb_config_descriptor *) buf)->bDescriptorType = type;
+	return len;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void eth_start(struct eth_dev *dev, gfp_t gfp_flags);
+static int alloc_requests(struct eth_dev *dev, unsigned n, gfp_t gfp_flags);
+
+static int
+set_ether_config(struct eth_dev *dev, gfp_t gfp_flags)
+{
+	int					result = 0;
+	struct usb_gadget			*gadget = dev->gadget;
+
+#if defined(CONFIG_USB_ETH_CDC) || defined(CONFIG_USB_ETH_RNDIS)
+	/* status endpoint used for RNDIS and (optionally) CDC */
+	if (!subset_active(dev) && dev->status_ep) {
+		dev->status = ep_desc(gadget, &hs_status_desc,
+						&fs_status_desc);
+		dev->status_ep->driver_data = dev;
+
+		result = usb_ep_enable(dev->status_ep, dev->status);
+		if (result != 0) {
+			debug("enable %s --> %d\n",
+				dev->status_ep->name, result);
+			goto done;
+		}
+	}
+#endif
+
+	dev->in = ep_desc(gadget, &hs_source_desc, &fs_source_desc);
+	dev->in_ep->driver_data = dev;
+
+	dev->out = ep_desc(gadget, &hs_sink_desc, &fs_sink_desc);
+	dev->out_ep->driver_data = dev;
+
+	/*
+	 * With CDC,  the host isn't allowed to use these two data
+	 * endpoints in the default altsetting for the interface.
+	 * so we don't activate them yet.  Reset from SET_INTERFACE.
+	 *
+	 * Strictly speaking RNDIS should work the same: activation is
+	 * a side effect of setting a packet filter.  Deactivation is
+	 * from REMOTE_NDIS_HALT_MSG, reset from REMOTE_NDIS_RESET_MSG.
+	 */
+	if (!cdc_active(dev)) {
+		result = usb_ep_enable(dev->in_ep, dev->in);
+		if (result != 0) {
+			debug("enable %s --> %d\n",
+				dev->in_ep->name, result);
+			goto done;
+		}
+
+		result = usb_ep_enable(dev->out_ep, dev->out);
+		if (result != 0) {
+			debug("enable %s --> %d\n",
+				dev->out_ep->name, result);
+			goto done;
+		}
+	}
+
+done:
+	if (result == 0)
+		result = alloc_requests(dev, qlen(gadget), gfp_flags);
+
+	/* on error, disable any endpoints  */
+	if (result < 0) {
+		if (!subset_active(dev) && dev->status_ep)
+			(void) usb_ep_disable(dev->status_ep);
+		dev->status = NULL;
+		(void) usb_ep_disable(dev->in_ep);
+		(void) usb_ep_disable(dev->out_ep);
+		dev->in = NULL;
+		dev->out = NULL;
+	} else if (!cdc_active(dev)) {
+		/*
+		 * activate non-CDC configs right away
+		 * this isn't strictly according to the RNDIS spec
+		 */
+		eth_start(dev, GFP_ATOMIC);
+	}
+
+	/* caller is responsible for cleanup on error */
+	return result;
+}
+
+static void eth_reset_config(struct eth_dev *dev)
+{
+	if (dev->config == 0)
+		return;
+
+	debug("%s\n", __func__);
+
+	rndis_uninit(dev->rndis_config);
+
+	/*
+	 * disable endpoints, forcing (synchronous) completion of
+	 * pending i/o.  then free the requests.
+	 */
+
+	if (dev->in) {
+		usb_ep_disable(dev->in_ep);
+		if (dev->tx_req) {
+			usb_ep_free_request(dev->in_ep, dev->tx_req);
+			dev->tx_req = NULL;
+		}
+	}
+	if (dev->out) {
+		usb_ep_disable(dev->out_ep);
+		if (dev->rx_req) {
+			usb_ep_free_request(dev->out_ep, dev->rx_req);
+			dev->rx_req = NULL;
+		}
+	}
+	if (dev->status)
+		usb_ep_disable(dev->status_ep);
+
+	dev->rndis = 0;
+	dev->cdc_filter = 0;
+	dev->config = 0;
+}
+
+/*
+ * change our operational config.  must agree with the code
+ * that returns config descriptors, and altsetting code.
+ */
+static int eth_set_config(struct eth_dev *dev, unsigned number,
+				gfp_t gfp_flags)
+{
+	int			result = 0;
+	struct usb_gadget	*gadget = dev->gadget;
+
+	if (gadget_is_sa1100(gadget)
+			&& dev->config
+			&& dev->tx_qlen != 0) {
+		/* tx fifo is full, but we can't clear it...*/
+		error("can't change configurations");
+		return -ESPIPE;
+	}
+	eth_reset_config(dev);
+
+	switch (number) {
+	case DEV_CONFIG_VALUE:
+		result = set_ether_config(dev, gfp_flags);
+		break;
+#ifdef	CONFIG_USB_ETH_RNDIS
+	case DEV_RNDIS_CONFIG_VALUE:
+		dev->rndis = 1;
+		result = set_ether_config(dev, gfp_flags);
+		break;
+#endif
+	default:
+		result = -EINVAL;
+		/* FALL THROUGH */
+	case 0:
+		break;
+	}
+
+	if (result) {
+		if (number)
+			eth_reset_config(dev);
+		usb_gadget_vbus_draw(dev->gadget,
+				gadget_is_otg(dev->gadget) ? 8 : 100);
+	} else {
+		char *speed;
+		unsigned power;
+
+		power = 2 * eth_config.bMaxPower;
+		usb_gadget_vbus_draw(dev->gadget, power);
+
+		switch (gadget->speed) {
+		case USB_SPEED_FULL:
+			speed = "full"; break;
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+		case USB_SPEED_HIGH:
+			speed = "high"; break;
+#endif
+		default:
+			speed = "?"; break;
+		}
+
+		dev->config = number;
+		printf("%s speed config #%d: %d mA, %s, using %s\n",
+				speed, number, power, driver_desc,
+				rndis_active(dev)
+					? "RNDIS"
+					: (cdc_active(dev)
+						? "CDC Ethernet"
+						: "CDC Ethernet Subset"));
+	}
+	return result;
+}
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef	CONFIG_USB_ETH_CDC
+
+/*
+ * The interrupt endpoint is used in CDC networking models (Ethernet, ATM)
+ * only to notify the host about link status changes (which we support) or
+ * report completion of some encapsulated command (as used in RNDIS).  Since
+ * we want this CDC Ethernet code to be vendor-neutral, we don't use that
+ * command mechanism; and only one status request is ever queued.
+ */
+static void eth_status_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	struct usb_cdc_notification	*event = req->buf;
+	int				value = req->status;
+	struct eth_dev			*dev = ep->driver_data;
+
+	/* issue the second notification if host reads the first */
+	if (event->bNotificationType == USB_CDC_NOTIFY_NETWORK_CONNECTION
+			&& value == 0) {
+		__le32	*data = req->buf + sizeof *event;
+
+		event->bmRequestType = 0xA1;
+		event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE;
+		event->wValue = __constant_cpu_to_le16(0);
+		event->wIndex = __constant_cpu_to_le16(1);
+		event->wLength = __constant_cpu_to_le16(8);
+
+		/* SPEED_CHANGE data is up/down speeds in bits/sec */
+		data[0] = data[1] = cpu_to_le32(BITRATE(dev->gadget));
+
+		req->length = STATUS_BYTECOUNT;
+		value = usb_ep_queue(ep, req, GFP_ATOMIC);
+		debug("send SPEED_CHANGE --> %d\n", value);
+		if (value == 0)
+			return;
+	} else if (value != -ECONNRESET) {
+		debug("event %02x --> %d\n",
+			event->bNotificationType, value);
+		if (event->bNotificationType ==
+				USB_CDC_NOTIFY_SPEED_CHANGE) {
+			l_ethdev.network_started = 1;
+			printf("USB network up!\n");
+		}
+	}
+	req->context = NULL;
+}
+
+static void issue_start_status(struct eth_dev *dev)
+{
+	struct usb_request		*req = dev->stat_req;
+	struct usb_cdc_notification	*event;
+	int				value;
+
+	/*
+	 * flush old status
+	 *
+	 * FIXME ugly idiom, maybe we'd be better with just
+	 * a "cancel the whole queue" primitive since any
+	 * unlink-one primitive has way too many error modes.
+	 * here, we "know" toggle is already clear...
+	 *
+	 * FIXME iff req->context != null just dequeue it
+	 */
+	usb_ep_disable(dev->status_ep);
+	usb_ep_enable(dev->status_ep, dev->status);
+
+	/*
+	 * 3.8.1 says to issue first NETWORK_CONNECTION, then
+	 * a SPEED_CHANGE.  could be useful in some configs.
+	 */
+	event = req->buf;
+	event->bmRequestType = 0xA1;
+	event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION;
+	event->wValue = __constant_cpu_to_le16(1);	/* connected */
+	event->wIndex = __constant_cpu_to_le16(1);
+	event->wLength = 0;
+
+	req->length = sizeof *event;
+	req->complete = eth_status_complete;
+	req->context = dev;
+
+	value = usb_ep_queue(dev->status_ep, req, GFP_ATOMIC);
+	if (value < 0)
+		debug("status buf queue --> %d\n", value);
+}
+
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+static void eth_setup_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	if (req->status || req->actual != req->length)
+		debug("setup complete --> %d, %d/%d\n",
+				req->status, req->actual, req->length);
+}
+
+#ifdef CONFIG_USB_ETH_RNDIS
+
+static void rndis_response_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	if (req->status || req->actual != req->length)
+		debug("rndis response complete --> %d, %d/%d\n",
+			req->status, req->actual, req->length);
+
+	/* done sending after USB_CDC_GET_ENCAPSULATED_RESPONSE */
+}
+
+static void rndis_command_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	struct eth_dev          *dev = ep->driver_data;
+	int			status;
+
+	/* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */
+	status = rndis_msg_parser(dev->rndis_config, (u8 *) req->buf);
+	if (status < 0)
+		error("%s: rndis parse error %d", __func__, status);
+}
+
+#endif	/* RNDIS */
+
+/*
+ * The setup() callback implements all the ep0 functionality that's not
+ * handled lower down.  CDC has a number of less-common features:
+ *
+ *  - two interfaces:  control, and ethernet data
+ *  - Ethernet data interface has two altsettings:  default, and active
+ *  - class-specific descriptors for the control interface
+ *  - class-specific control requests
+ */
+static int
+eth_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
+{
+	struct eth_dev		*dev = get_gadget_data(gadget);
+	struct usb_request	*req = dev->req;
+	int			value = -EOPNOTSUPP;
+	u16			wIndex = le16_to_cpu(ctrl->wIndex);
+	u16			wValue = le16_to_cpu(ctrl->wValue);
+	u16			wLength = le16_to_cpu(ctrl->wLength);
+
+	/*
+	 * descriptors just go into the pre-allocated ep0 buffer,
+	 * while config change events may enable network traffic.
+	 */
+
+	debug("%s\n", __func__);
+
+	req->complete = eth_setup_complete;
+	switch (ctrl->bRequest) {
+
+	case USB_REQ_GET_DESCRIPTOR:
+		if (ctrl->bRequestType != USB_DIR_IN)
+			break;
+		switch (wValue >> 8) {
+
+		case USB_DT_DEVICE:
+			value = min(wLength, (u16) sizeof device_desc);
+			memcpy(req->buf, &device_desc, value);
+			break;
+		case USB_DT_DEVICE_QUALIFIER:
+			if (!gadget_is_dualspeed(gadget))
+				break;
+			value = min(wLength, (u16) sizeof dev_qualifier);
+			memcpy(req->buf, &dev_qualifier, value);
+			break;
+
+		case USB_DT_OTHER_SPEED_CONFIG:
+			if (!gadget_is_dualspeed(gadget))
+				break;
+			/* FALLTHROUGH */
+		case USB_DT_CONFIG:
+			value = config_buf(gadget, req->buf,
+					wValue >> 8,
+					wValue & 0xff,
+					gadget_is_otg(gadget));
+			if (value >= 0)
+				value = min(wLength, (u16) value);
+			break;
+
+		case USB_DT_STRING:
+			value = usb_gadget_get_string(&stringtab,
+					wValue & 0xff, req->buf);
+
+			if (value >= 0)
+				value = min(wLength, (u16) value);
+
+			break;
+		}
+		break;
+
+	case USB_REQ_SET_CONFIGURATION:
+		if (ctrl->bRequestType != 0)
+			break;
+		if (gadget->a_hnp_support)
+			debug("HNP available\n");
+		else if (gadget->a_alt_hnp_support)
+			debug("HNP needs a different root port\n");
+		value = eth_set_config(dev, wValue, GFP_ATOMIC);
+		break;
+	case USB_REQ_GET_CONFIGURATION:
+		if (ctrl->bRequestType != USB_DIR_IN)
+			break;
+		*(u8 *)req->buf = dev->config;
+		value = min(wLength, (u16) 1);
+		break;
+
+	case USB_REQ_SET_INTERFACE:
+		if (ctrl->bRequestType != USB_RECIP_INTERFACE
+				|| !dev->config
+				|| wIndex > 1)
+			break;
+		if (!cdc_active(dev) && wIndex != 0)
+			break;
+
+		/*
+		 * PXA hardware partially handles SET_INTERFACE;
+		 * we need to kluge around that interference.
+		 */
+		if (gadget_is_pxa(gadget)) {
+			value = eth_set_config(dev, DEV_CONFIG_VALUE,
+						GFP_ATOMIC);
+			/*
+			 * PXA25x driver use non-CDC ethernet gadget.
+			 * But only _CDC and _RNDIS code can signalize
+			 * that network is working. So we signalize it
+			 * here.
+			 */
+			l_ethdev.network_started = 1;
+			debug("USB network up!\n");
+			goto done_set_intf;
+		}
+
+#ifdef CONFIG_USB_ETH_CDC
+		switch (wIndex) {
+		case 0:		/* control/master intf */
+			if (wValue != 0)
+				break;
+			if (dev->status) {
+				usb_ep_disable(dev->status_ep);
+				usb_ep_enable(dev->status_ep, dev->status);
+			}
+
+			value = 0;
+			break;
+		case 1:		/* data intf */
+			if (wValue > 1)
+				break;
+			usb_ep_disable(dev->in_ep);
+			usb_ep_disable(dev->out_ep);
+
+			/*
+			 * CDC requires the data transfers not be done from
+			 * the default interface setting ... also, setting
+			 * the non-default interface resets filters etc.
+			 */
+			if (wValue == 1) {
+				if (!cdc_active(dev))
+					break;
+				usb_ep_enable(dev->in_ep, dev->in);
+				usb_ep_enable(dev->out_ep, dev->out);
+				dev->cdc_filter = DEFAULT_FILTER;
+				if (dev->status)
+					issue_start_status(dev);
+				eth_start(dev, GFP_ATOMIC);
+			}
+			value = 0;
+			break;
+		}
+#else
+		/*
+		 * FIXME this is wrong, as is the assumption that
+		 * all non-PXA hardware talks real CDC ...
+		 */
+		debug("set_interface ignored!\n");
+#endif /* CONFIG_USB_ETH_CDC */
+
+done_set_intf:
+		break;
+	case USB_REQ_GET_INTERFACE:
+		if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
+				|| !dev->config
+				|| wIndex > 1)
+			break;
+		if (!(cdc_active(dev) || rndis_active(dev)) && wIndex != 0)
+			break;
+
+		/* for CDC, iff carrier is on, data interface is active. */
+		if (rndis_active(dev) || wIndex != 1)
+			*(u8 *)req->buf = 0;
+		else {
+			/* *(u8 *)req->buf = netif_carrier_ok (dev->net) ? 1 : 0; */
+			/* carrier always ok ...*/
+			*(u8 *)req->buf = 1 ;
+		}
+		value = min(wLength, (u16) 1);
+		break;
+
+#ifdef CONFIG_USB_ETH_CDC
+	case USB_CDC_SET_ETHERNET_PACKET_FILTER:
+		/*
+		 * see 6.2.30: no data, wIndex = interface,
+		 * wValue = packet filter bitmap
+		 */
+		if (ctrl->bRequestType != (USB_TYPE_CLASS|USB_RECIP_INTERFACE)
+				|| !cdc_active(dev)
+				|| wLength != 0
+				|| wIndex > 1)
+			break;
+		debug("packet filter %02x\n", wValue);
+		dev->cdc_filter = wValue;
+		value = 0;
+		break;
+
+	/*
+	 * and potentially:
+	 * case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS:
+	 * case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER:
+	 * case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER:
+	 * case USB_CDC_GET_ETHERNET_STATISTIC:
+	 */
+
+#endif /* CONFIG_USB_ETH_CDC */
+
+#ifdef CONFIG_USB_ETH_RNDIS
+	/*
+	 * RNDIS uses the CDC command encapsulation mechanism to implement
+	 * an RPC scheme, with much getting/setting of attributes by OID.
+	 */
+	case USB_CDC_SEND_ENCAPSULATED_COMMAND:
+		if (ctrl->bRequestType != (USB_TYPE_CLASS|USB_RECIP_INTERFACE)
+				|| !rndis_active(dev)
+				|| wLength > USB_BUFSIZ
+				|| wValue
+				|| rndis_control_intf.bInterfaceNumber
+					!= wIndex)
+			break;
+		/* read the request, then process it */
+		value = wLength;
+		req->complete = rndis_command_complete;
+		/* later, rndis_control_ack () sends a notification */
+		break;
+
+	case USB_CDC_GET_ENCAPSULATED_RESPONSE:
+		if ((USB_DIR_IN|USB_TYPE_CLASS|USB_RECIP_INTERFACE)
+					== ctrl->bRequestType
+				&& rndis_active(dev)
+				/* && wLength >= 0x0400 */
+				&& !wValue
+				&& rndis_control_intf.bInterfaceNumber
+					== wIndex) {
+			u8 *buf;
+			u32 n;
+
+			/* return the result */
+			buf = rndis_get_next_response(dev->rndis_config, &n);
+			if (buf) {
+				memcpy(req->buf, buf, n);
+				req->complete = rndis_response_complete;
+				rndis_free_response(dev->rndis_config, buf);
+				value = n;
+			}
+			/* else stalls ... spec says to avoid that */
+		}
+		break;
+#endif	/* RNDIS */
+
+	default:
+		debug("unknown control req%02x.%02x v%04x i%04x l%d\n",
+			ctrl->bRequestType, ctrl->bRequest,
+			wValue, wIndex, wLength);
+	}
+
+	/* respond with data transfer before status phase? */
+	if (value >= 0) {
+		debug("respond with data transfer before status phase\n");
+		req->length = value;
+		req->zero = value < wLength
+				&& (value % gadget->ep0->maxpacket) == 0;
+		value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
+		if (value < 0) {
+			debug("ep_queue --> %d\n", value);
+			req->status = 0;
+			eth_setup_complete(gadget->ep0, req);
+		}
+	}
+
+	/* host either stalls (value < 0) or reports success */
+	return value;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void rx_complete(struct usb_ep *ep, struct usb_request *req);
+
+static int rx_submit(struct eth_dev *dev, struct usb_request *req,
+				gfp_t gfp_flags)
+{
+	int			retval = -ENOMEM;
+	size_t			size;
+
+	/*
+	 * Padding up to RX_EXTRA handles minor disagreements with host.
+	 * Normally we use the USB "terminate on short read" convention;
+	 * so allow up to (N*maxpacket), since that memory is normally
+	 * already allocated.  Some hardware doesn't deal well with short
+	 * reads (e.g. DMA must be N*maxpacket), so for now don't trim a
+	 * byte off the end (to force hardware errors on overflow).
+	 *
+	 * RNDIS uses internal framing, and explicitly allows senders to
+	 * pad to end-of-packet.  That's potentially nice for speed,
+	 * but means receivers can't recover synch on their own.
+	 */
+
+	debug("%s\n", __func__);
+	if (!req)
+		return -EINVAL;
+
+	size = (ETHER_HDR_SIZE + dev->mtu + RX_EXTRA);
+	size += dev->out_ep->maxpacket - 1;
+	if (rndis_active(dev))
+		size += sizeof(struct rndis_packet_msg_type);
+	size -= size % dev->out_ep->maxpacket;
+
+	/*
+	 * Some platforms perform better when IP packets are aligned,
+	 * but on at least one, checksumming fails otherwise.  Note:
+	 * RNDIS headers involve variable numbers of LE32 values.
+	 */
+
+	req->buf = (u8 *) NetRxPackets[0];
+	req->length = size;
+	req->complete = rx_complete;
+
+	retval = usb_ep_queue(dev->out_ep, req, gfp_flags);
+
+	if (retval)
+		error("rx submit --> %d", retval);
+
+	return retval;
+}
+
+static void rx_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	struct eth_dev	*dev = ep->driver_data;
+
+	debug("%s: status %d\n", __func__, req->status);
+	switch (req->status) {
+	/* normal completion */
+	case 0:
+		if (rndis_active(dev)) {
+			/* we know MaxPacketsPerTransfer == 1 here */
+			int length = rndis_rm_hdr(req->buf, req->actual);
+			if (length < 0)
+				goto length_err;
+			req->length -= length;
+			req->actual -= length;
+		}
+		if (req->actual < ETH_HLEN || ETH_FRAME_LEN < req->actual) {
+length_err:
+			dev->stats.rx_errors++;
+			dev->stats.rx_length_errors++;
+			debug("rx length %d\n", req->length);
+			break;
+		}
+
+		dev->stats.rx_packets++;
+		dev->stats.rx_bytes += req->length;
+		break;
+
+	/* software-driven interface shutdown */
+	case -ECONNRESET:		/* unlink */
+	case -ESHUTDOWN:		/* disconnect etc */
+	/* for hardware automagic (such as pxa) */
+	case -ECONNABORTED:		/* endpoint reset */
+		break;
+
+	/* data overrun */
+	case -EOVERFLOW:
+		dev->stats.rx_over_errors++;
+		/* FALLTHROUGH */
+	default:
+		dev->stats.rx_errors++;
+		break;
+	}
+
+	packet_received = 1;
+}
+
+static int alloc_requests(struct eth_dev *dev, unsigned n, gfp_t gfp_flags)
+{
+
+	dev->tx_req = usb_ep_alloc_request(dev->in_ep, 0);
+
+	if (!dev->tx_req)
+		goto fail1;
+
+	dev->rx_req = usb_ep_alloc_request(dev->out_ep, 0);
+
+	if (!dev->rx_req)
+		goto fail2;
+
+	return 0;
+
+fail2:
+	usb_ep_free_request(dev->in_ep, dev->tx_req);
+fail1:
+	error("can't alloc requests");
+	return -1;
+}
+
+static void tx_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	struct eth_dev	*dev = ep->driver_data;
+
+	debug("%s: status %s\n", __func__, (req->status) ? "failed" : "ok");
+	switch (req->status) {
+	default:
+		dev->stats.tx_errors++;
+		debug("tx err %d\n", req->status);
+		/* FALLTHROUGH */
+	case -ECONNRESET:		/* unlink */
+	case -ESHUTDOWN:		/* disconnect etc */
+		break;
+	case 0:
+		dev->stats.tx_bytes += req->length;
+	}
+	dev->stats.tx_packets++;
+
+	packet_sent = 1;
+}
+
+static inline int eth_is_promisc(struct eth_dev *dev)
+{
+	/* no filters for the CDC subset; always promisc */
+	if (subset_active(dev))
+		return 1;
+	return dev->cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS;
+}
+
+#if 0
+static int eth_start_xmit (struct sk_buff *skb, struct net_device *net)
+{
+	struct eth_dev		*dev = netdev_priv(net);
+	int			length = skb->len;
+	int			retval;
+	struct usb_request	*req = NULL;
+	unsigned long		flags;
+
+	/* apply outgoing CDC or RNDIS filters */
+	if (!eth_is_promisc (dev)) {
+		u8		*dest = skb->data;
+
+		if (is_multicast_ether_addr(dest)) {
+			u16	type;
+
+			/* ignores USB_CDC_PACKET_TYPE_MULTICAST and host
+			 * SET_ETHERNET_MULTICAST_FILTERS requests
+			 */
+			if (is_broadcast_ether_addr(dest))
+				type = USB_CDC_PACKET_TYPE_BROADCAST;
+			else
+				type = USB_CDC_PACKET_TYPE_ALL_MULTICAST;
+			if (!(dev->cdc_filter & type)) {
+				dev_kfree_skb_any (skb);
+				return 0;
+			}
+		}
+		/* ignores USB_CDC_PACKET_TYPE_DIRECTED */
+	}
+
+	spin_lock_irqsave(&dev->req_lock, flags);
+	/*
+	 * this freelist can be empty if an interrupt triggered disconnect()
+	 * and reconfigured the gadget (shutting down this queue) after the
+	 * network stack decided to xmit but before we got the spinlock.
+	 */
+	if (list_empty(&dev->tx_reqs)) {
+		spin_unlock_irqrestore(&dev->req_lock, flags);
+		return 1;
+	}
+
+	req = container_of (dev->tx_reqs.next, struct usb_request, list);
+	list_del (&req->list);
+
+	/* temporarily stop TX queue when the freelist empties */
+	if (list_empty (&dev->tx_reqs))
+		netif_stop_queue (net);
+	spin_unlock_irqrestore(&dev->req_lock, flags);
+
+	/* no buffer copies needed, unless the network stack did it
+	 * or the hardware can't use skb buffers.
+	 * or there's not enough space for any RNDIS headers we need
+	 */
+	if (rndis_active(dev)) {
+		struct sk_buff	*skb_rndis;
+
+		skb_rndis = skb_realloc_headroom (skb,
+				sizeof (struct rndis_packet_msg_type));
+		if (!skb_rndis)
+			goto drop;
+
+		dev_kfree_skb_any (skb);
+		skb = skb_rndis;
+		rndis_add_hdr (skb);
+		length = skb->len;
+	}
+	req->buf = skb->data;
+	req->context = skb;
+	req->complete = tx_complete;
+
+	/* use zlp framing on tx for strict CDC-Ether conformance,
+	 * though any robust network rx path ignores extra padding.
+	 * and some hardware doesn't like to write zlps.
+	 */
+	req->zero = 1;
+	if (!dev->zlp && (length % dev->in_ep->maxpacket) == 0)
+		length++;
+
+	req->length = length;
+
+	/* throttle highspeed IRQ rate back slightly */
+	if (gadget_is_dualspeed(dev->gadget))
+		req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH)
+			? ((atomic_read(&dev->tx_qlen) % qmult) != 0)
+			: 0;
+
+	retval = usb_ep_queue (dev->in_ep, req, GFP_ATOMIC);
+	switch (retval) {
+	default:
+		DEBUG (dev, "tx queue err %d\n", retval);
+		break;
+	case 0:
+		net->trans_start = jiffies;
+		atomic_inc (&dev->tx_qlen);
+	}
+
+	if (retval) {
+drop:
+		dev->stats.tx_dropped++;
+		dev_kfree_skb_any (skb);
+		spin_lock_irqsave(&dev->req_lock, flags);
+		if (list_empty (&dev->tx_reqs))
+			netif_start_queue (net);
+		list_add (&req->list, &dev->tx_reqs);
+		spin_unlock_irqrestore(&dev->req_lock, flags);
+	}
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+#endif
+
+static void eth_unbind(struct usb_gadget *gadget)
+{
+	struct eth_dev		*dev = get_gadget_data(gadget);
+
+	debug("%s...\n", __func__);
+	rndis_deregister(dev->rndis_config);
+	rndis_exit();
+
+	/* we've already been disconnected ... no i/o is active */
+	if (dev->req) {
+		usb_ep_free_request(gadget->ep0, dev->req);
+		dev->req = NULL;
+	}
+	if (dev->stat_req) {
+		usb_ep_free_request(dev->status_ep, dev->stat_req);
+		dev->stat_req = NULL;
+	}
+
+	if (dev->tx_req) {
+		usb_ep_free_request(dev->in_ep, dev->tx_req);
+		dev->tx_req = NULL;
+	}
+
+	if (dev->rx_req) {
+		usb_ep_free_request(dev->out_ep, dev->rx_req);
+		dev->rx_req = NULL;
+	}
+
+/*	unregister_netdev (dev->net);*/
+/*	free_netdev(dev->net);*/
+
+	dev->gadget = NULL;
+	set_gadget_data(gadget, NULL);
+}
+
+static void eth_disconnect(struct usb_gadget *gadget)
+{
+	eth_reset_config(get_gadget_data(gadget));
+	/* FIXME RNDIS should enter RNDIS_UNINITIALIZED */
+}
+
+static void eth_suspend(struct usb_gadget *gadget)
+{
+	/* Not used */
+}
+
+static void eth_resume(struct usb_gadget *gadget)
+{
+	/* Not used */
+}
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef CONFIG_USB_ETH_RNDIS
+
+/*
+ * The interrupt endpoint is used in RNDIS to notify the host when messages
+ * other than data packets are available ... notably the REMOTE_NDIS_*_CMPLT
+ * messages, but also REMOTE_NDIS_INDICATE_STATUS_MSG and potentially even
+ * REMOTE_NDIS_KEEPALIVE_MSG.
+ *
+ * The RNDIS control queue is processed by GET_ENCAPSULATED_RESPONSE, and
+ * normally just one notification will be queued.
+ */
+
+static void rndis_control_ack_complete(struct usb_ep *ep,
+					struct usb_request *req)
+{
+	struct eth_dev          *dev = ep->driver_data;
+
+	debug("%s...\n", __func__);
+	if (req->status || req->actual != req->length)
+		debug("rndis control ack complete --> %d, %d/%d\n",
+			req->status, req->actual, req->length);
+
+	if (!l_ethdev.network_started) {
+		if (rndis_get_state(dev->rndis_config)
+				== RNDIS_DATA_INITIALIZED) {
+			l_ethdev.network_started = 1;
+			printf("USB RNDIS network up!\n");
+		}
+	}
+
+	req->context = NULL;
+
+	if (req != dev->stat_req)
+		usb_ep_free_request(ep, req);
+}
+
+static char rndis_resp_buf[8] __attribute__((aligned(sizeof(__le32))));
+
+static int rndis_control_ack(struct eth_device *net)
+{
+	struct eth_dev		*dev = &l_ethdev;
+	int                     length;
+	struct usb_request      *resp = dev->stat_req;
+
+	/* in case RNDIS calls this after disconnect */
+	if (!dev->status) {
+		debug("status ENODEV\n");
+		return -ENODEV;
+	}
+
+	/* in case queue length > 1 */
+	if (resp->context) {
+		resp = usb_ep_alloc_request(dev->status_ep, GFP_ATOMIC);
+		if (!resp)
+			return -ENOMEM;
+		resp->buf = rndis_resp_buf;
+	}
+
+	/*
+	 * Send RNDIS RESPONSE_AVAILABLE notification;
+	 * USB_CDC_NOTIFY_RESPONSE_AVAILABLE should work too
+	 */
+	resp->length = 8;
+	resp->complete = rndis_control_ack_complete;
+	resp->context = dev;
+
+	*((__le32 *) resp->buf) = __constant_cpu_to_le32(1);
+	*((__le32 *) (resp->buf + 4)) = __constant_cpu_to_le32(0);
+
+	length = usb_ep_queue(dev->status_ep, resp, GFP_ATOMIC);
+	if (length < 0) {
+		resp->status = 0;
+		rndis_control_ack_complete(dev->status_ep, resp);
+	}
+
+	return 0;
+}
+
+#else
+
+#define	rndis_control_ack	NULL
+
+#endif	/* RNDIS */
+
+static void eth_start(struct eth_dev *dev, gfp_t gfp_flags)
+{
+	if (rndis_active(dev)) {
+		rndis_set_param_medium(dev->rndis_config,
+					NDIS_MEDIUM_802_3,
+					BITRATE(dev->gadget)/100);
+		rndis_signal_connect(dev->rndis_config);
+	}
+}
+
+static int eth_stop(struct eth_dev *dev)
+{
+#ifdef RNDIS_COMPLETE_SIGNAL_DISCONNECT
+	unsigned long ts;
+	unsigned long timeout = CONFIG_SYS_HZ; /* 1 sec to stop RNDIS */
+#endif
+
+	if (rndis_active(dev)) {
+		rndis_set_param_medium(dev->rndis_config, NDIS_MEDIUM_802_3, 0);
+		rndis_signal_disconnect(dev->rndis_config);
+
+#ifdef RNDIS_COMPLETE_SIGNAL_DISCONNECT
+		/* Wait until host receives OID_GEN_MEDIA_CONNECT_STATUS */
+		ts = get_timer(0);
+		while (get_timer(ts) < timeout)
+			usb_gadget_handle_interrupts();
+#endif
+
+		rndis_uninit(dev->rndis_config);
+		dev->rndis = 0;
+	}
+
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int is_eth_addr_valid(char *str)
+{
+	if (strlen(str) == 17) {
+		int i;
+		char *p, *q;
+		uchar ea[6];
+
+		/* see if it looks like an ethernet address */
+
+		p = str;
+
+		for (i = 0; i < 6; i++) {
+			char term = (i == 5 ? '\0' : ':');
+
+			ea[i] = simple_strtol(p, &q, 16);
+
+			if ((q - p) != 2 || *q++ != term)
+				break;
+
+			p = q;
+		}
+
+		/* Now check the contents. */
+		return is_valid_ether_addr(ea);
+	}
+	return 0;
+}
+
+static u8 nibble(unsigned char c)
+{
+	if (likely(isdigit(c)))
+		return c - '0';
+	c = toupper(c);
+	if (likely(isxdigit(c)))
+		return 10 + c - 'A';
+	return 0;
+}
+
+static int get_ether_addr(const char *str, u8 *dev_addr)
+{
+	if (str) {
+		unsigned	i;
+
+		for (i = 0; i < 6; i++) {
+			unsigned char num;
+
+			if ((*str == '.') || (*str == ':'))
+				str++;
+			num = nibble(*str++) << 4;
+			num |= (nibble(*str++));
+			dev_addr[i] = num;
+		}
+		if (is_valid_ether_addr(dev_addr))
+			return 0;
+	}
+	return 1;
+}
+
+static int eth_bind(struct usb_gadget *gadget)
+{
+	struct eth_dev		*dev = &l_ethdev;
+	u8			cdc = 1, zlp = 1, rndis = 1;
+	struct usb_ep		*in_ep, *out_ep, *status_ep = NULL;
+	int			status = -ENOMEM;
+	int			gcnum;
+	u8			tmp[7];
+
+	/* these flags are only ever cleared; compiler take note */
+#ifndef	CONFIG_USB_ETH_CDC
+	cdc = 0;
+#endif
+#ifndef	CONFIG_USB_ETH_RNDIS
+	rndis = 0;
+#endif
+	/*
+	 * Because most host side USB stacks handle CDC Ethernet, that
+	 * standard protocol is _strongly_ preferred for interop purposes.
+	 * (By everyone except Microsoft.)
+	 */
+	if (gadget_is_pxa(gadget)) {
+		/* pxa doesn't support altsettings */
+		cdc = 0;
+	} else if (gadget_is_musbhdrc(gadget)) {
+		/* reduce tx dma overhead by avoiding special cases */
+		zlp = 0;
+	} else if (gadget_is_sh(gadget)) {
+		/* sh doesn't support multiple interfaces or configs */
+		cdc = 0;
+		rndis = 0;
+	} else if (gadget_is_sa1100(gadget)) {
+		/* hardware can't write zlps */
+		zlp = 0;
+		/*
+		 * sa1100 CAN do CDC, without status endpoint ... we use
+		 * non-CDC to be compatible with ARM Linux-2.4 "usb-eth".
+		 */
+		cdc = 0;
+	}
+
+	gcnum = usb_gadget_controller_number(gadget);
+	if (gcnum >= 0)
+		device_desc.bcdDevice = cpu_to_le16(0x0300 + gcnum);
+	else {
+		/*
+		 * can't assume CDC works.  don't want to default to
+		 * anything less functional on CDC-capable hardware,
+		 * so we fail in this case.
+		 */
+		error("controller '%s' not recognized",
+			gadget->name);
+		return -ENODEV;
+	}
+
+	/*
+	 * If there's an RNDIS configuration, that's what Windows wants to
+	 * be using ... so use these product IDs here and in the "linux.inf"
+	 * needed to install MSFT drivers.  Current Linux kernels will use
+	 * the second configuration if it's CDC Ethernet, and need some help
+	 * to choose the right configuration otherwise.
+	 */
+	if (rndis) {
+#if defined(CONFIG_USB_RNDIS_VENDOR_ID) && defined(CONFIG_USB_RNDIS_PRODUCT_ID)
+		device_desc.idVendor =
+			__constant_cpu_to_le16(CONFIG_USB_RNDIS_VENDOR_ID);
+		device_desc.idProduct =
+			__constant_cpu_to_le16(CONFIG_USB_RNDIS_PRODUCT_ID);
+#else
+		device_desc.idVendor =
+			__constant_cpu_to_le16(RNDIS_VENDOR_NUM);
+		device_desc.idProduct =
+			__constant_cpu_to_le16(RNDIS_PRODUCT_NUM);
+#endif
+		sprintf(product_desc, "RNDIS/%s", driver_desc);
+
+	/*
+	 * CDC subset ... recognized by Linux since 2.4.10, but Windows
+	 * drivers aren't widely available.  (That may be improved by
+	 * supporting one submode of the "SAFE" variant of MDLM.)
+	 */
+	} else {
+#if defined(CONFIG_USB_CDC_VENDOR_ID) && defined(CONFIG_USB_CDC_PRODUCT_ID)
+		device_desc.idVendor = cpu_to_le16(CONFIG_USB_CDC_VENDOR_ID);
+		device_desc.idProduct = cpu_to_le16(CONFIG_USB_CDC_PRODUCT_ID);
+#else
+		if (!cdc) {
+			device_desc.idVendor =
+				__constant_cpu_to_le16(SIMPLE_VENDOR_NUM);
+			device_desc.idProduct =
+				__constant_cpu_to_le16(SIMPLE_PRODUCT_NUM);
+		}
+#endif
+	}
+	/* support optional vendor/distro customization */
+	if (bcdDevice)
+		device_desc.bcdDevice = cpu_to_le16(bcdDevice);
+	if (iManufacturer)
+		strlcpy(manufacturer, iManufacturer, sizeof manufacturer);
+	if (iProduct)
+		strlcpy(product_desc, iProduct, sizeof product_desc);
+	if (iSerialNumber) {
+		device_desc.iSerialNumber = STRING_SERIALNUMBER,
+		strlcpy(serial_number, iSerialNumber, sizeof serial_number);
+	}
+
+	/* all we really need is bulk IN/OUT */
+	usb_ep_autoconfig_reset(gadget);
+	in_ep = usb_ep_autoconfig(gadget, &fs_source_desc);
+	if (!in_ep) {
+autoconf_fail:
+		error("can't autoconfigure on %s\n",
+			gadget->name);
+		return -ENODEV;
+	}
+	in_ep->driver_data = in_ep;	/* claim */
+
+	out_ep = usb_ep_autoconfig(gadget, &fs_sink_desc);
+	if (!out_ep)
+		goto autoconf_fail;
+	out_ep->driver_data = out_ep;	/* claim */
+
+#if defined(CONFIG_USB_ETH_CDC) || defined(CONFIG_USB_ETH_RNDIS)
+	/*
+	 * CDC Ethernet control interface doesn't require a status endpoint.
+	 * Since some hosts expect one, try to allocate one anyway.
+	 */
+	if (cdc || rndis) {
+		status_ep = usb_ep_autoconfig(gadget, &fs_status_desc);
+		if (status_ep) {
+			status_ep->driver_data = status_ep;	/* claim */
+		} else if (rndis) {
+			error("can't run RNDIS on %s", gadget->name);
+			return -ENODEV;
+#ifdef CONFIG_USB_ETH_CDC
+		} else if (cdc) {
+			control_intf.bNumEndpoints = 0;
+			/* FIXME remove endpoint from descriptor list */
+#endif
+		}
+	}
+#endif
+
+	/* one config:  cdc, else minimal subset */
+	if (!cdc) {
+		eth_config.bNumInterfaces = 1;
+		eth_config.iConfiguration = STRING_SUBSET;
+
+		/*
+		 * use functions to set these up, in case we're built to work
+		 * with multiple controllers and must override CDC Ethernet.
+		 */
+		fs_subset_descriptors();
+		hs_subset_descriptors();
+	}
+
+	device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
+	usb_gadget_set_selfpowered(gadget);
+
+	/* For now RNDIS is always a second config */
+	if (rndis)
+		device_desc.bNumConfigurations = 2;
+
+	if (gadget_is_dualspeed(gadget)) {
+		if (rndis)
+			dev_qualifier.bNumConfigurations = 2;
+		else if (!cdc)
+			dev_qualifier.bDeviceClass = USB_CLASS_VENDOR_SPEC;
+
+		/* assumes 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;
+#if defined(CONFIG_USB_ETH_CDC) || defined(CONFIG_USB_ETH_RNDIS)
+		if (status_ep)
+			hs_status_desc.bEndpointAddress =
+					fs_status_desc.bEndpointAddress;
+#endif
+	}
+
+	if (gadget_is_otg(gadget)) {
+		otg_descriptor.bmAttributes |= USB_OTG_HNP,
+		eth_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+		eth_config.bMaxPower = 4;
+#ifdef	CONFIG_USB_ETH_RNDIS
+		rndis_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+		rndis_config.bMaxPower = 4;
+#endif
+	}
+
+
+	/* network device setup */
+	dev->net = &l_netdev;
+
+	dev->cdc = cdc;
+	dev->zlp = zlp;
+
+	dev->in_ep = in_ep;
+	dev->out_ep = out_ep;
+	dev->status_ep = status_ep;
+
+	/*
+	 * Module params for these addresses should come from ID proms.
+	 * The host side address is used with CDC and RNDIS, and commonly
+	 * ends up in a persistent config database.  It's not clear if
+	 * host side code for the SAFE thing cares -- its original BLAN
+	 * thing didn't, Sharp never assigned those addresses on Zaurii.
+	 */
+	get_ether_addr(dev_addr, dev->net->enetaddr);
+
+	memset(tmp, 0, sizeof(tmp));
+	memcpy(tmp, dev->net->enetaddr, sizeof(dev->net->enetaddr));
+
+	get_ether_addr(host_addr, dev->host_mac);
+
+	sprintf(ethaddr, "%02X%02X%02X%02X%02X%02X",
+		dev->host_mac[0], dev->host_mac[1],
+			dev->host_mac[2], dev->host_mac[3],
+			dev->host_mac[4], dev->host_mac[5]);
+
+	if (rndis) {
+		status = rndis_init();
+		if (status < 0) {
+			error("can't init RNDIS, %d", status);
+			goto fail;
+		}
+	}
+
+	/*
+	 * use PKTSIZE (or aligned... from u-boot) and set
+	 * wMaxSegmentSize accordingly
+	 */
+	dev->mtu = PKTSIZE_ALIGN; /* RNDIS does not like this, only 1514, TODO*/
+
+	/* preallocate control message data and buffer */
+	dev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
+	if (!dev->req)
+		goto fail;
+	dev->req->buf = control_req;
+	dev->req->complete = eth_setup_complete;
+
+	/* ... and maybe likewise for status transfer */
+#if defined(CONFIG_USB_ETH_CDC) || defined(CONFIG_USB_ETH_RNDIS)
+	if (dev->status_ep) {
+		dev->stat_req = usb_ep_alloc_request(dev->status_ep,
+							GFP_KERNEL);
+		if (!dev->stat_req) {
+			usb_ep_free_request(dev->status_ep, dev->req);
+
+			goto fail;
+		}
+		dev->stat_req->buf = status_req;
+		dev->stat_req->context = NULL;
+	}
+#endif
+
+	/* finish hookup to lower layer ... */
+	dev->gadget = gadget;
+	set_gadget_data(gadget, dev);
+	gadget->ep0->driver_data = dev;
+
+	/*
+	 * two kinds of host-initiated state changes:
+	 *  - iff DATA transfer is active, carrier is "on"
+	 *  - tx queueing enabled if open *and* carrier is "on"
+	 */
+
+	printf("using %s, OUT %s IN %s%s%s\n", gadget->name,
+		out_ep->name, in_ep->name,
+		status_ep ? " STATUS " : "",
+		status_ep ? status_ep->name : ""
+		);
+	printf("MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
+		dev->net->enetaddr[0], dev->net->enetaddr[1],
+		dev->net->enetaddr[2], dev->net->enetaddr[3],
+		dev->net->enetaddr[4], dev->net->enetaddr[5]);
+
+	if (cdc || rndis)
+		printf("HOST MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
+			dev->host_mac[0], dev->host_mac[1],
+			dev->host_mac[2], dev->host_mac[3],
+			dev->host_mac[4], dev->host_mac[5]);
+
+	if (rndis) {
+		u32	vendorID = 0;
+
+		/* FIXME RNDIS vendor id == "vendor NIC code" == ? */
+
+		dev->rndis_config = rndis_register(rndis_control_ack);
+		if (dev->rndis_config < 0) {
+fail0:
+			eth_unbind(gadget);
+			debug("RNDIS setup failed\n");
+			status = -ENODEV;
+			goto fail;
+		}
+
+		/* these set up a lot of the OIDs that RNDIS needs */
+		rndis_set_host_mac(dev->rndis_config, dev->host_mac);
+		if (rndis_set_param_dev(dev->rndis_config, dev->net, dev->mtu,
+					&dev->stats, &dev->cdc_filter))
+			goto fail0;
+		if (rndis_set_param_vendor(dev->rndis_config, vendorID,
+					manufacturer))
+			goto fail0;
+		if (rndis_set_param_medium(dev->rndis_config,
+					NDIS_MEDIUM_802_3, 0))
+			goto fail0;
+		printf("RNDIS ready\n");
+	}
+	return 0;
+
+fail:
+	error("%s failed, status = %d", __func__, status);
+	eth_unbind(gadget);
+	return status;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int usb_eth_init(struct eth_device *netdev, bd_t *bd)
+{
+	struct eth_dev *dev = &l_ethdev;
+	struct usb_gadget *gadget;
+	unsigned long ts;
+	unsigned long timeout = USB_CONNECT_TIMEOUT;
+
+	if (!netdev) {
+		error("received NULL ptr");
+		goto fail;
+	}
+
+	/* Configure default mac-addresses for the USB ethernet device */
+#ifdef CONFIG_USBNET_DEV_ADDR
+	strlcpy(dev_addr, CONFIG_USBNET_DEV_ADDR, sizeof(dev_addr));
+#endif
+#ifdef CONFIG_USBNET_HOST_ADDR
+	strlcpy(host_addr, CONFIG_USBNET_HOST_ADDR, sizeof(host_addr));
+#endif
+	/* Check if the user overruled the MAC addresses */
+	if (getenv("usbnet_devaddr"))
+		strlcpy(dev_addr, getenv("usbnet_devaddr"),
+			sizeof(dev_addr));
+
+	if (getenv("usbnet_hostaddr"))
+		strlcpy(host_addr, getenv("usbnet_hostaddr"),
+			sizeof(host_addr));
+
+	if (!is_eth_addr_valid(dev_addr)) {
+		error("Need valid 'usbnet_devaddr' to be set");
+		goto fail;
+	}
+	if (!is_eth_addr_valid(host_addr)) {
+		error("Need valid 'usbnet_hostaddr' to be set");
+		goto fail;
+	}
+
+	if (usb_gadget_register_driver(&eth_driver) < 0)
+		goto fail;
+
+	dev->network_started = 0;
+
+	packet_received = 0;
+	packet_sent = 0;
+
+	gadget = dev->gadget;
+	usb_gadget_connect(gadget);
+
+	if (getenv("cdc_connect_timeout"))
+		timeout = simple_strtoul(getenv("cdc_connect_timeout"),
+						NULL, 10) * CONFIG_SYS_HZ;
+	ts = get_timer(0);
+	while (!l_ethdev.network_started) {
+		/* Handle control-c and timeouts */
+		if (ctrlc() || (get_timer(ts) > timeout)) {
+			error("The remote end did not respond in time.");
+			goto fail;
+		}
+		usb_gadget_handle_interrupts();
+	}
+
+	packet_received = 0;
+	rx_submit(dev, dev->rx_req, 0);
+	return 0;
+fail:
+	return -1;
+}
+
+static int usb_eth_send(struct eth_device *netdev, void *packet, int length)
+{
+	int			retval;
+	void			*rndis_pkt = NULL;
+	struct eth_dev		*dev = &l_ethdev;
+	struct usb_request	*req = dev->tx_req;
+	unsigned long ts;
+	unsigned long timeout = USB_CONNECT_TIMEOUT;
+
+	debug("%s:...\n", __func__);
+
+	/* new buffer is needed to include RNDIS header */
+	if (rndis_active(dev)) {
+		rndis_pkt = malloc(length +
+					sizeof(struct rndis_packet_msg_type));
+		if (!rndis_pkt) {
+			error("No memory to alloc RNDIS packet");
+			goto drop;
+		}
+		rndis_add_hdr(rndis_pkt, length);
+		memcpy(rndis_pkt + sizeof(struct rndis_packet_msg_type),
+				packet, length);
+		packet = rndis_pkt;
+		length += sizeof(struct rndis_packet_msg_type);
+	}
+	req->buf = packet;
+	req->context = NULL;
+	req->complete = tx_complete;
+
+	/*
+	 * use zlp framing on tx for strict CDC-Ether conformance,
+	 * though any robust network rx path ignores extra padding.
+	 * and some hardware doesn't like to write zlps.
+	 */
+	req->zero = 1;
+	if (!dev->zlp && (length % dev->in_ep->maxpacket) == 0)
+		length++;
+
+	req->length = length;
+#if 0
+	/* throttle highspeed IRQ rate back slightly */
+	if (gadget_is_dualspeed(dev->gadget))
+		req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH)
+			? ((dev->tx_qlen % qmult) != 0) : 0;
+#endif
+	dev->tx_qlen = 1;
+	ts = get_timer(0);
+	packet_sent = 0;
+
+	retval = usb_ep_queue(dev->in_ep, req, GFP_ATOMIC);
+
+	if (!retval)
+		debug("%s: packet queued\n", __func__);
+	while (!packet_sent) {
+		if (get_timer(ts) > timeout) {
+			printf("timeout sending packets to usb ethernet\n");
+			return -1;
+		}
+		usb_gadget_handle_interrupts();
+	}
+	if (rndis_pkt)
+		free(rndis_pkt);
+
+	return 0;
+drop:
+	dev->stats.tx_dropped++;
+	return -ENOMEM;
+}
+
+static int usb_eth_recv(struct eth_device *netdev)
+{
+	struct eth_dev *dev = &l_ethdev;
+
+	usb_gadget_handle_interrupts();
+
+	if (packet_received) {
+		debug("%s: packet received\n", __func__);
+		if (dev->rx_req) {
+			NetReceive(NetRxPackets[0], dev->rx_req->length);
+			packet_received = 0;
+
+			rx_submit(dev, dev->rx_req, 0);
+		} else
+			error("dev->rx_req invalid");
+	}
+	return 0;
+}
+
+void usb_eth_halt(struct eth_device *netdev)
+{
+	struct eth_dev *dev = &l_ethdev;
+
+	if (!netdev) {
+		error("received NULL ptr");
+		return;
+	}
+
+	/* If the gadget not registered, simple return */
+	if (!dev->gadget)
+		return;
+
+	/*
+	 * Some USB controllers may need additional deinitialization here
+	 * before dropping pull-up (also due to hardware issues).
+	 * For example: unhandled interrupt with status stage started may
+	 * bring the controller to fully broken state (until board reset).
+	 * There are some variants to debug and fix such cases:
+	 * 1) In the case of RNDIS connection eth_stop can perform additional
+	 * interrupt handling. See RNDIS_COMPLETE_SIGNAL_DISCONNECT definition.
+	 * 2) 'pullup' callback in your UDC driver can be improved to perform
+	 * this deinitialization.
+	 */
+	eth_stop(dev);
+
+	usb_gadget_disconnect(dev->gadget);
+
+	/* Clear pending interrupt */
+	if (dev->network_started) {
+		usb_gadget_handle_interrupts();
+		dev->network_started = 0;
+	}
+
+	usb_gadget_unregister_driver(&eth_driver);
+}
+
+static struct usb_gadget_driver eth_driver = {
+	.speed		= DEVSPEED,
+
+	.bind		= eth_bind,
+	.unbind		= eth_unbind,
+
+	.setup		= eth_setup,
+	.disconnect	= eth_disconnect,
+
+	.suspend	= eth_suspend,
+	.resume		= eth_resume,
+};
+
+int usb_eth_initialize(bd_t *bi)
+{
+	struct eth_device *netdev = &l_netdev;
+
+	strlcpy(netdev->name, USB_NET_NAME, sizeof(netdev->name));
+
+	netdev->init = usb_eth_init;
+	netdev->send = usb_eth_send;
+	netdev->recv = usb_eth_recv;
+	netdev->halt = usb_eth_halt;
+
+#ifdef CONFIG_MCAST_TFTP
+  #error not supported
+#endif
+	eth_register(netdev);
+	return 0;
+}