Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2660 insertions, 0 deletions

diff --git a/drivers/usb/gadget/ether.c b/drivers/usb/gadget/ether.c
new file mode 100644
index 00000000000..cff9fb0b73c
--- /dev/null
+++ b/drivers/usb/gadget/ether.c
@@ -0,0 +1,2660 @@
+/*
+ * ether.c -- Ethernet gadget driver, with CDC and non-CDC options
+ *
+ * Copyright (C) 2003-2005 David Brownell
+ * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+
+// #define DEBUG 1
+// #define VERBOSE
+
+#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/utsname.h>
+#include <linux/device.h>
+#include <linux/moduleparam.h>
+#include <linux/ctype.h>
+
+#include <asm/byteorder.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/unaligned.h>
+
+#include <linux/usb_ch9.h>
+#include <linux/usb_cdc.h>
+#include <linux/usb_gadget.h>
+
+#include <linux/random.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+
+#include "gadget_chips.h"
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * 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.
+ *
+ * There's some hardware that can't talk CDC.  We make that hardware
+ * implement a "minimalist" vendor-agnostic CDC core:  same framing, but
+ * link-level setup only requires activating the configuration.
+ * Linux supports it, but other host operating systems may not.
+ * (This is a subset of CDC Ethernet.)
+ *
+ * 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.
+ */
+
+#define DRIVER_DESC		"Ethernet Gadget"
+#define DRIVER_VERSION		"Equinox 2004"
+
+static const char shortname [] = "ether";
+static const char driver_desc [] = DRIVER_DESC;
+
+#define RX_EXTRA	20		/* guard against rx overflows */
+
+#ifdef	CONFIG_USB_ETH_RNDIS
+#include "rndis.h"
+#else
+#define rndis_init() 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_DIRECTED)
+
+
+/*-------------------------------------------------------------------------*/
+
+struct eth_dev {
+	spinlock_t		lock;
+	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 list_head	tx_reqs, rx_reqs;
+
+	struct net_device	*net;
+	struct net_device_stats	stats;
+	atomic_t		tx_qlen;
+
+	struct work_struct	work;
+	unsigned		zlp:1;
+	unsigned		cdc:1;
+	unsigned		rndis:1;
+	unsigned		suspended:1;
+	u16			cdc_filter;
+	unsigned long		todo;
+#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 const char *EP_IN_NAME;
+static const char *EP_OUT_NAME;
+static const char *EP_STATUS_NAME;
+
+/*-------------------------------------------------------------------------*/
+
+/* 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
+#define	SIMPLE_PRODUCT_NUM	0x505a
+
+/* 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).
+ */
+
+static ushort __initdata idVendor;
+module_param(idVendor, ushort, S_IRUGO);
+MODULE_PARM_DESC(idVendor, "USB Vendor ID");
+
+static ushort __initdata idProduct;
+module_param(idProduct, ushort, S_IRUGO);
+MODULE_PARM_DESC(idProduct, "USB Product ID");
+
+static ushort __initdata bcdDevice;
+module_param(bcdDevice, ushort, S_IRUGO);
+MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");
+
+static char *__initdata iManufacturer;
+module_param(iManufacturer, charp, S_IRUGO);
+MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
+
+static char *__initdata iProduct;
+module_param(iProduct, charp, S_IRUGO);
+MODULE_PARM_DESC(iProduct, "USB Product string");
+
+/* initial value, changed by "ifconfig usb0 hw ether xx:xx:xx:xx:xx:xx" */
+static char *__initdata dev_addr;
+module_param(dev_addr, charp, S_IRUGO);
+MODULE_PARM_DESC(dev_addr, "Device Ethernet Address");
+
+/* this address is invisible to ifconfig */
+static char *__initdata host_addr;
+module_param(host_addr, charp, S_IRUGO);
+MODULE_PARM_DESC(host_addr, "Host Ethernet Address");
+
+
+/*-------------------------------------------------------------------------*/
+
+/* Include CDC support if we could run on CDC-capable hardware. */
+
+#ifdef CONFIG_USB_GADGET_NET2280
+#define	DEV_CONFIG_CDC
+#endif
+
+#ifdef CONFIG_USB_GADGET_DUMMY_HCD
+#define	DEV_CONFIG_CDC
+#endif
+
+#ifdef CONFIG_USB_GADGET_GOKU
+#define	DEV_CONFIG_CDC
+#endif
+
+#ifdef CONFIG_USB_GADGET_LH7A40X
+#define DEV_CONFIG_CDC
+#endif
+
+#ifdef CONFIG_USB_GADGET_MQ11XX
+#define	DEV_CONFIG_CDC
+#endif
+
+#ifdef CONFIG_USB_GADGET_OMAP
+#define	DEV_CONFIG_CDC
+#endif
+
+#ifdef CONFIG_USB_GADGET_N9604
+#define	DEV_CONFIG_CDC
+#endif
+
+#ifdef CONFIG_USB_GADGET_PXA27X
+#define DEV_CONFIG_CDC
+#endif
+
+#ifdef CONFIG_USB_GADGET_AT91
+#define DEV_CONFIG_CDC
+#endif
+
+
+/* For CDC-incapable hardware, choose the simple cdc subset.
+ * Anything that talks bulk (without notable bugs) can do this.
+ */
+#ifdef CONFIG_USB_GADGET_PXA2XX
+#define	DEV_CONFIG_SUBSET
+#endif
+
+#ifdef CONFIG_USB_GADGET_SH
+#define	DEV_CONFIG_SUBSET
+#endif
+
+#ifdef CONFIG_USB_GADGET_SA1100
+/* use non-CDC for backwards compatibility */
+#define	DEV_CONFIG_SUBSET
+#endif
+
+#ifdef CONFIG_USB_GADGET_S3C2410
+#define DEV_CONFIG_CDC
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+/* "main" config is either CDC, or its simple subset */
+static inline int is_cdc(struct eth_dev *dev)
+{
+#if	!defined(DEV_CONFIG_SUBSET)
+	return 1;		/* only cdc possible */
+#elif	!defined (DEV_CONFIG_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
+
+static unsigned qmult = 5;
+module_param (qmult, uint, S_IRUGO|S_IWUSR);
+
+
+/* for dual-speed hardware, use deeper queues at highspeed */
+#define qlen(gadget) \
+	(DEFAULT_QLEN*((gadget->speed == USB_SPEED_HIGH) ? qmult : 1))
+
+/* also defer IRQs on highspeed TX */
+#define TX_DELAY	qmult
+
+#define	BITRATE(g)	(((g)->speed == USB_SPEED_HIGH) ? HS_BPS : FS_BPS)
+
+#else	/* full speed (low speed doesn't do bulk) */
+#define qlen(gadget) DEFAULT_QLEN
+
+#define	BITRATE(g)	FS_BPS
+#endif
+
+
+/*-------------------------------------------------------------------------*/
+
+#define xprintk(d,level,fmt,args...) \
+	printk(level "%s: " fmt , (d)->net->name , ## args)
+
+#ifdef DEBUG
+#undef DEBUG
+#define DEBUG(dev,fmt,args...) \
+	xprintk(dev , KERN_DEBUG , fmt , ## args)
+#else
+#define DEBUG(dev,fmt,args...) \
+	do { } while (0)
+#endif /* DEBUG */
+
+#ifdef VERBOSE
+#define VDEBUG	DEBUG
+#else
+#define VDEBUG(dev,fmt,args...) \
+	do { } while (0)
+#endif /* DEBUG */
+
+#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)
+
+/*-------------------------------------------------------------------------*/
+
+/* 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 USB_BUFSIZ	256		/* holds our biggest descriptor */
+
+/*
+ * 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 =		50,
+};
+
+#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 =            50,
+};
+#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.
+ */
+
+#ifdef	DEV_CONFIG_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
+
+#if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
+
+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),
+};
+
+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 struct usb_cdc_acm_descriptor acm_descriptor = {
+	.bLength =  		sizeof acm_descriptor,
+	.bDescriptorType = 	USB_DT_CS_INTERFACE,
+	.bDescriptorSubType = 	USB_CDC_ACM_TYPE,
+
+	.bmCapabilities = 	0x00,
+};
+
+#endif
+
+#ifdef	DEV_CONFIG_CDC
+
+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,
+};
+
+#endif
+
+#if defined(DEV_CONFIG_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 cancelation; 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	DEV_CONFIG_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 DEV_CONFIG_SUBSET
+
+/*
+ * "Simple" CDC-subset option is a simple vendor-neutral model that most
+ * full speed controllers can handle:  one interface, two bulk endpoints.
+ */
+
+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_VENDOR_SPEC,
+	.bInterfaceSubClass =	0,
+	.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,
+};
+
+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,
+};
+
+static const struct usb_descriptor_header *fs_eth_function [11] = {
+	(struct usb_descriptor_header *) &otg_descriptor,
+#ifdef DEV_CONFIG_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 /* DEV_CONFIG_CDC */
+};
+
+static inline void __init fs_subset_descriptors(void)
+{
+#ifdef DEV_CONFIG_SUBSET
+	fs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
+	fs_eth_function[2] = (struct usb_descriptor_header *) &fs_source_desc;
+	fs_eth_function[3] = (struct usb_descriptor_header *) &fs_sink_desc;
+	fs_eth_function[4] = 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
+
+#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.
+ */
+
+#if defined(DEV_CONFIG_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 /* DEV_CONFIG_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 DEV_CONFIG_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 /* DEV_CONFIG_CDC */
+};
+
+static inline void __init hs_subset_descriptors(void)
+{
+#ifdef DEV_CONFIG_SUBSET
+	hs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
+	hs_eth_function[2] = (struct usb_descriptor_header *) &fs_source_desc;
+	hs_eth_function[3] = (struct usb_descriptor_header *) &fs_sink_desc;
+	hs_eth_function[4] = 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. */
+#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
+
+static inline void __init hs_subset_descriptors(void)
+{
+}
+
+#endif	/* !CONFIG_USB_GADGET_DUALSPEED */
+
+/*-------------------------------------------------------------------------*/
+
+/* descriptors that are built on-demand */
+
+static char				manufacturer [50];
+static char				product_desc [40] = DRIVER_DESC;
+
+#ifdef	DEV_CONFIG_CDC
+/* address that the host will use ... usually assigned at random */
+static char				ethaddr [2 * ETH_ALEN + 1];
+#endif
+
+/* static strings, in UTF-8 */
+static struct usb_string		strings [] = {
+	{ STRING_MANUFACTURER,	manufacturer, },
+	{ STRING_PRODUCT,	product_desc, },
+	{ STRING_DATA,		"Ethernet Data", },
+#ifdef	DEV_CONFIG_CDC
+	{ STRING_CDC,		"CDC Ethernet", },
+	{ STRING_ETHADDR,	ethaddr, },
+	{ STRING_CONTROL,	"CDC Communications Control", },
+#endif
+#ifdef	DEV_CONFIG_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,
+};
+
+/*
+ * one config, two interfaces:  control, data.
+ * complications: class descriptors, and an altsetting.
+ */
+static int
+config_buf (enum usb_device_speed speed,
+	u8 *buf, u8 type,
+	unsigned index, int is_otg)
+{
+	int					len;
+	const struct usb_config_descriptor	*config;
+	const struct usb_descriptor_header	**function;
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+	int				hs = (speed == USB_SPEED_HIGH);
+
+	if (type == USB_DT_OTHER_SPEED_CONFIG)
+		hs = !hs;
+#define which_fn(t)	(hs ? hs_ ## t ## _function : fs_ ## t ## _function)
+#else
+#define	which_fn(t)	(fs_ ## t ## _function)
+#endif
+
+	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, int gfp_flags);
+static int alloc_requests (struct eth_dev *dev, unsigned n, int gfp_flags);
+
+#ifdef	DEV_CONFIG_CDC
+static inline int ether_alt_ep_setup (struct eth_dev *dev, struct usb_ep *ep)
+{
+	const struct usb_endpoint_descriptor	*d;
+
+	/* 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.
+	 */
+
+	/* one endpoint writes data back IN to the host */
+	if (strcmp (ep->name, EP_IN_NAME) == 0) {
+		d = ep_desc (dev->gadget, &hs_source_desc, &fs_source_desc);
+		ep->driver_data = dev;
+		dev->in = d;
+
+	/* one endpoint just reads OUT packets */
+	} else if (strcmp (ep->name, EP_OUT_NAME) == 0) {
+		d = ep_desc (dev->gadget, &hs_sink_desc, &fs_sink_desc);
+		ep->driver_data = dev;
+		dev->out = d;
+
+	/* optional status/notification endpoint */
+	} else if (EP_STATUS_NAME &&
+			strcmp (ep->name, EP_STATUS_NAME) == 0) {
+		int			result;
+
+		d = ep_desc (dev->gadget, &hs_status_desc, &fs_status_desc);
+		result = usb_ep_enable (ep, d);
+		if (result < 0)
+			return result;
+
+		ep->driver_data = dev;
+		dev->status = d;
+	}
+	return 0;
+}
+#endif
+
+#if	defined(DEV_CONFIG_SUBSET) || defined(CONFIG_USB_ETH_RNDIS)
+static inline int ether_ep_setup (struct eth_dev *dev, struct usb_ep *ep)
+{
+	int					result;
+	const struct usb_endpoint_descriptor	*d;
+
+	/* CDC subset is simpler:  if the device is there,
+	 * it's live with rx and tx endpoints.
+	 *
+	 * Do this as a shortcut for RNDIS too.
+	 */
+
+	/* one endpoint writes data back IN to the host */
+	if (strcmp (ep->name, EP_IN_NAME) == 0) {
+		d = ep_desc (dev->gadget, &hs_source_desc, &fs_source_desc);
+		result = usb_ep_enable (ep, d);
+		if (result < 0)
+			return result;
+
+		ep->driver_data = dev;
+		dev->in = d;
+
+	/* one endpoint just reads OUT packets */
+	} else if (strcmp (ep->name, EP_OUT_NAME) == 0) {
+		d = ep_desc (dev->gadget, &hs_sink_desc, &fs_sink_desc);
+		result = usb_ep_enable (ep, d);
+		if (result < 0)
+			return result;
+
+		ep->driver_data = dev;
+		dev->out = d;
+	}
+
+	return 0;
+}
+#endif
+
+static int
+set_ether_config (struct eth_dev *dev, int gfp_flags)
+{
+	int			result = 0;
+	struct usb_ep		*ep;
+	struct usb_gadget	*gadget = dev->gadget;
+
+	gadget_for_each_ep (ep, gadget) {
+#ifdef	DEV_CONFIG_CDC
+		if (!dev->rndis && dev->cdc) {
+			result = ether_alt_ep_setup (dev, ep);
+			if (result == 0)
+				continue;
+		}
+#endif
+
+#ifdef	CONFIG_USB_ETH_RNDIS
+		if (dev->rndis && strcmp (ep->name, EP_STATUS_NAME) == 0) {
+			const struct usb_endpoint_descriptor	*d;
+			d = ep_desc (gadget, &hs_status_desc, &fs_status_desc);
+			result = usb_ep_enable (ep, d);
+			if (result == 0) {
+				ep->driver_data = dev;
+				dev->status = d;
+				continue;
+			}
+		} else
+#endif
+
+		{
+#if	defined(DEV_CONFIG_SUBSET) || defined(CONFIG_USB_ETH_RNDIS)
+			result = ether_ep_setup (dev, ep);
+			if (result == 0)
+				continue;
+#endif
+		}
+
+		/* stop on error */
+		ERROR (dev, "can't enable %s, result %d\n", ep->name, result);
+		break;
+	}
+	if (!result && (!dev->in_ep || !dev->out_ep))
+		result = -ENODEV;
+
+	if (result == 0)
+		result = alloc_requests (dev, qlen (gadget), gfp_flags);
+
+	/* on error, disable any endpoints  */
+	if (result < 0) {
+#if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
+		if (dev->status)
+			(void) usb_ep_disable (dev->status_ep);
+#endif
+		dev->status = NULL;
+#if defined(DEV_CONFIG_SUBSET) || defined(CONFIG_USB_ETH_RNDIS)
+		if (dev->rndis || !dev->cdc) {
+			if (dev->in)
+				(void) usb_ep_disable (dev->in_ep);
+			if (dev->out)
+				(void) usb_ep_disable (dev->out_ep);
+		}
+#endif
+		dev->in = NULL;
+		dev->out = NULL;
+	} else
+
+	/* activate non-CDC configs right away
+	 * this isn't strictly according to the RNDIS spec
+	 */
+#if defined(DEV_CONFIG_SUBSET) || defined(CONFIG_USB_ETH_RNDIS)
+	if (dev->rndis || !dev->cdc) {
+		netif_carrier_on (dev->net);
+		if (netif_running (dev->net)) {
+			spin_unlock (&dev->lock);
+			eth_start (dev, GFP_ATOMIC);
+			spin_lock (&dev->lock);
+		}
+	}
+#endif
+
+	if (result == 0)
+		DEBUG (dev, "qlen %d\n", qlen (gadget));
+
+	/* caller is responsible for cleanup on error */
+	return result;
+}
+
+static void eth_reset_config (struct eth_dev *dev)
+{
+	struct usb_request	*req;
+
+	if (dev->config == 0)
+		return;
+
+	DEBUG (dev, "%s\n", __FUNCTION__);
+
+	netif_stop_queue (dev->net);
+	netif_carrier_off (dev->net);
+
+	/* disable endpoints, forcing (synchronous) completion of
+	 * pending i/o.  then free the requests.
+	 */
+	if (dev->in) {
+		usb_ep_disable (dev->in_ep);
+		while (likely (!list_empty (&dev->tx_reqs))) {
+			req = container_of (dev->tx_reqs.next,
+						struct usb_request, list);
+			list_del (&req->list);
+			usb_ep_free_request (dev->in_ep, req);
+		}
+	}
+	if (dev->out) {
+		usb_ep_disable (dev->out_ep);
+		while (likely (!list_empty (&dev->rx_reqs))) {
+			req = container_of (dev->rx_reqs.next,
+						struct usb_request, list);
+			list_del (&req->list);
+			usb_ep_free_request (dev->out_ep, req);
+		}
+	}
+
+	if (dev->status) {
+		usb_ep_disable (dev->status_ep);
+	}
+	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, int gfp_flags)
+{
+	int			result = 0;
+	struct usb_gadget	*gadget = dev->gadget;
+
+	if (number == dev->config)
+		return 0;
+
+	if (gadget_is_sa1100 (gadget)
+			&& dev->config
+			&& atomic_read (&dev->tx_qlen) != 0) {
+		/* tx fifo is full, but we can't clear it...*/
+		INFO (dev, "can't change configurations\n");
+		return -ESPIPE;
+	}
+	eth_reset_config (dev);
+
+	/* default:  pass all packets, no multicast filtering */
+	dev->cdc_filter = 0x000f;
+
+	switch (number) {
+	case DEV_CONFIG_VALUE:
+		dev->rndis = 0;
+		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,
+				dev->gadget->is_otg ? 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;
+		INFO (dev, "%s speed config #%d: %d mA, %s, using %s\n",
+				speed, number, power, driver_desc,
+				dev->rndis
+					? "RNDIS"
+					: (dev->cdc
+						? "CDC Ethernet"
+						: "CDC Ethernet Subset"));
+	}
+	return result;
+}
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef	DEV_CONFIG_CDC
+
+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 (dev, "send SPEED_CHANGE --> %d\n", value);
+		if (value == 0)
+			return;
+	} else if (value != -ECONNRESET)
+		DEBUG (dev, "event %02x --> %d\n",
+			event->bNotificationType, value);
+	event->bmRequestType = 0xff;
+}
+
+static void issue_start_status (struct eth_dev *dev)
+{
+	struct usb_request		*req = dev->stat_req;
+	struct usb_cdc_notification	*event;
+	int				value;
+ 
+	DEBUG (dev, "%s, flush old status first\n", __FUNCTION__);
+
+	/* 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...
+	 */
+	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;
+	value = usb_ep_queue (dev->status_ep, req, GFP_ATOMIC);
+	if (value < 0)
+		DEBUG (dev, "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 ((struct eth_dev *) ep->driver_data,
+				"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 ((struct eth_dev *) ep->driver_data,
+			"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 */
+	spin_lock(&dev->lock);
+	status = rndis_msg_parser (dev->rndis_config, (u8 *) req->buf);
+	if (status < 0)
+		ERROR(dev, "%s: rndis parse error %d\n", __FUNCTION__, status);
+	spin_unlock(&dev->lock);
+}
+
+#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 = ctrl->wIndex;
+	u16			wValue = ctrl->wValue;
+	u16			wLength = ctrl->wLength;
+
+	/* descriptors just go into the pre-allocated ep0 buffer,
+	 * while config change events may enable network traffic.
+	 */
+	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;
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+		case USB_DT_DEVICE_QUALIFIER:
+			if (!gadget->is_dualspeed)
+				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)
+				break;
+			// FALLTHROUGH
+#endif /* CONFIG_USB_GADGET_DUALSPEED */
+		case USB_DT_CONFIG:
+			value = config_buf (gadget->speed, req->buf,
+					wValue >> 8,
+					wValue & 0xff,
+					gadget->is_otg);
+			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 (dev, "HNP available\n");
+		else if (gadget->a_alt_hnp_support)
+			DEBUG (dev, "HNP needs a different root port\n");
+		spin_lock (&dev->lock);
+		value = eth_set_config (dev, wValue, GFP_ATOMIC);
+		spin_unlock (&dev->lock);
+		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 (!dev->cdc && wIndex != 0)
+			break;
+		spin_lock (&dev->lock);
+
+		/* 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);
+			goto done_set_intf;
+		}
+
+#ifdef DEV_CONFIG_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 clears filters etc.
+			 */
+			if (wValue == 1) {
+				usb_ep_enable (dev->in_ep, dev->in);
+				usb_ep_enable (dev->out_ep, dev->out);
+				dev->cdc_filter = DEFAULT_FILTER;
+				netif_carrier_on (dev->net);
+				if (dev->status)
+					issue_start_status (dev);
+				if (netif_running (dev->net)) {
+					spin_unlock (&dev->lock);
+					eth_start (dev, GFP_ATOMIC);
+					spin_lock (&dev->lock);
+				}
+			} else {
+				netif_stop_queue (dev->net);
+				netif_carrier_off (dev->net);
+			}
+			value = 0;
+			break;
+		}
+#else
+		/* FIXME this is wrong, as is the assumption that
+		 * all non-PXA hardware talks real CDC ...
+		 */
+		dev_warn (&gadget->dev, "set_interface ignored!\n");
+#endif /* DEV_CONFIG_CDC */
+
+done_set_intf:
+		spin_unlock (&dev->lock);
+		break;
+	case USB_REQ_GET_INTERFACE:
+		if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
+				|| !dev->config
+				|| wIndex > 1)
+			break;
+		if (!(dev->cdc || dev->rndis) && wIndex != 0)
+			break;
+
+		/* for CDC, iff carrier is on, data interface is active. */
+		if (dev->rndis || wIndex != 1)
+			*(u8 *)req->buf = 0;
+		else
+			*(u8 *)req->buf = netif_carrier_ok (dev->net) ? 1 : 0;
+		value = min (wLength, (u16) 1);
+		break;
+
+#ifdef DEV_CONFIG_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)
+				|| !dev->cdc
+				|| dev->rndis
+				|| wLength != 0
+				|| wIndex > 1)
+			break;
+		DEBUG (dev, "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 /* DEV_CONFIG_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)
+				|| !dev->rndis
+				|| 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
+				&& dev->rndis
+				// && wLength >= 0x0400
+				&& !wValue
+				&& rndis_control_intf.bInterfaceNumber
+					== wIndex) {
+			u8 *buf;
+
+			/* return the result */
+			buf = rndis_get_next_response (dev->rndis_config,
+						       &value);
+			if (buf) {
+				memcpy (req->buf, buf, value);
+				req->complete = rndis_response_complete;
+				rndis_free_response(dev->rndis_config, buf);
+			}
+			/* else stalls ... spec says to avoid that */
+		}
+		break;
+#endif	/* RNDIS */
+
+	default:
+		VDEBUG (dev,
+			"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) {
+		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 (dev, "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
+eth_disconnect (struct usb_gadget *gadget)
+{
+	struct eth_dev		*dev = get_gadget_data (gadget);
+	unsigned long		flags;
+
+	spin_lock_irqsave (&dev->lock, flags);
+	netif_stop_queue (dev->net);
+	netif_carrier_off (dev->net);
+	eth_reset_config (dev);
+	spin_unlock_irqrestore (&dev->lock, flags);
+
+	/* FIXME RNDIS should enter RNDIS_UNINITIALIZED */
+
+	/* next we may get setup() calls to enumerate new connections;
+	 * or an unbind() during shutdown (including removing module).
+	 */
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* NETWORK DRIVER HOOKUP (to the layer above this driver) */
+
+static int eth_change_mtu (struct net_device *net, int new_mtu)
+{
+	struct eth_dev	*dev = netdev_priv(net);
+
+	// FIXME if rndis, don't change while link's live
+
+	if (new_mtu <= ETH_HLEN || new_mtu > ETH_FRAME_LEN)
+		return -ERANGE;
+	/* no zero-length packet read wanted after mtu-sized packets */
+	if (((new_mtu + sizeof (struct ethhdr)) % dev->in_ep->maxpacket) == 0)
+		return -EDOM;
+	net->mtu = new_mtu;
+	return 0;
+}
+
+static struct net_device_stats *eth_get_stats (struct net_device *net)
+{
+	return &((struct eth_dev *)netdev_priv(net))->stats;
+}
+
+static void eth_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *p)
+{
+	struct eth_dev	*dev = netdev_priv(net);
+	strlcpy(p->driver, shortname, sizeof p->driver);
+	strlcpy(p->version, DRIVER_VERSION, sizeof p->version);
+	strlcpy(p->fw_version, dev->gadget->name, sizeof p->fw_version);
+	strlcpy (p->bus_info, dev->gadget->dev.bus_id, sizeof p->bus_info);
+}
+
+static u32 eth_get_link(struct net_device *net)
+{
+	struct eth_dev	*dev = netdev_priv(net);
+	return dev->gadget->speed != USB_SPEED_UNKNOWN;
+}
+
+static struct ethtool_ops ops = {
+	.get_drvinfo = eth_get_drvinfo,
+	.get_link = eth_get_link
+};
+
+static void defer_kevent (struct eth_dev *dev, int flag)
+{
+	if (test_and_set_bit (flag, &dev->todo))
+		return;
+	if (!schedule_work (&dev->work))
+		ERROR (dev, "kevent %d may have been dropped\n", flag);
+	else
+		DEBUG (dev, "kevent %d scheduled\n", flag);
+}
+
+static void rx_complete (struct usb_ep *ep, struct usb_request *req);
+
+static int
+rx_submit (struct eth_dev *dev, struct usb_request *req, int gfp_flags)
+{
+	struct sk_buff		*skb;
+	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.
+	 */
+	size = (sizeof (struct ethhdr) + dev->net->mtu + RX_EXTRA);
+	size += dev->out_ep->maxpacket - 1;
+#ifdef CONFIG_USB_ETH_RNDIS
+	if (dev->rndis)
+		size += sizeof (struct rndis_packet_msg_type);
+#endif	
+	size -= size % dev->out_ep->maxpacket;
+
+	if ((skb = alloc_skb (size + NET_IP_ALIGN, gfp_flags)) == 0) {
+		DEBUG (dev, "no rx skb\n");
+		goto enomem;
+	}
+	
+	/* Some platforms perform better when IP packets are aligned,
+	 * but on at least one, checksumming fails otherwise.  Note:
+	 * this doesn't account for variable-sized RNDIS headers.
+	 */
+	skb_reserve(skb, NET_IP_ALIGN);
+
+	req->buf = skb->data;
+	req->length = size;
+	req->complete = rx_complete;
+	req->context = skb;
+
+	retval = usb_ep_queue (dev->out_ep, req, gfp_flags);
+	if (retval == -ENOMEM)
+enomem:
+		defer_kevent (dev, WORK_RX_MEMORY);
+	if (retval) {
+		DEBUG (dev, "rx submit --> %d\n", retval);
+		dev_kfree_skb_any (skb);
+		spin_lock (&dev->lock);
+		list_add (&req->list, &dev->rx_reqs);
+		spin_unlock (&dev->lock);
+	}
+	return retval;
+}
+
+static void rx_complete (struct usb_ep *ep, struct usb_request *req)
+{
+	struct sk_buff	*skb = req->context;
+	struct eth_dev	*dev = ep->driver_data;
+	int		status = req->status;
+
+	switch (status) {
+
+	/* normal completion */
+	case 0:
+		skb_put (skb, req->actual);
+#ifdef CONFIG_USB_ETH_RNDIS
+		/* we know MaxPacketsPerTransfer == 1 here */
+		if (dev->rndis)
+			rndis_rm_hdr (req->buf, &(skb->len));
+#endif
+		if (ETH_HLEN > skb->len || skb->len > ETH_FRAME_LEN) {
+			dev->stats.rx_errors++;
+			dev->stats.rx_length_errors++;
+			DEBUG (dev, "rx length %d\n", skb->len);
+			break;
+		}
+
+		skb->dev = dev->net;
+		skb->protocol = eth_type_trans (skb, dev->net);
+		dev->stats.rx_packets++;
+		dev->stats.rx_bytes += skb->len;
+
+		/* no buffer copies needed, unless hardware can't
+		 * use skb buffers.
+		 */
+		status = netif_rx (skb);
+		skb = NULL;
+		break;
+
+	/* software-driven interface shutdown */
+	case -ECONNRESET:		// unlink
+	case -ESHUTDOWN:		// disconnect etc
+		VDEBUG (dev, "rx shutdown, code %d\n", status);
+		goto quiesce;
+
+	/* for hardware automagic (such as pxa) */
+	case -ECONNABORTED:		// endpoint reset
+		DEBUG (dev, "rx %s reset\n", ep->name);
+		defer_kevent (dev, WORK_RX_MEMORY);
+quiesce:
+		dev_kfree_skb_any (skb);
+		goto clean;
+
+	/* data overrun */
+	case -EOVERFLOW:
+		dev->stats.rx_over_errors++;
+		// FALLTHROUGH
+	    
+	default:
+		dev->stats.rx_errors++;
+		DEBUG (dev, "rx status %d\n", status);
+		break;
+	}
+
+	if (skb)
+		dev_kfree_skb_any (skb);
+	if (!netif_running (dev->net)) {
+clean:
+		/* nobody reading rx_reqs, so no dev->lock */
+		list_add (&req->list, &dev->rx_reqs);
+		req = NULL;
+	}
+	if (req)
+		rx_submit (dev, req, GFP_ATOMIC);
+}
+
+static int prealloc (struct list_head *list, struct usb_ep *ep,
+			unsigned n, int gfp_flags)
+{
+	unsigned		i;
+	struct usb_request	*req;
+
+	if (!n)
+		return -ENOMEM;
+
+	/* queue/recycle up to N requests */
+	i = n;
+	list_for_each_entry (req, list, list) {
+		if (i-- == 0)
+			goto extra;
+	}
+	while (i--) {
+		req = usb_ep_alloc_request (ep, gfp_flags);
+		if (!req)
+			return list_empty (list) ? -ENOMEM : 0;
+		list_add (&req->list, list);
+	}
+	return 0;
+
+extra:
+	/* free extras */
+	for (;;) {
+		struct list_head	*next;
+
+		next = req->list.next;
+		list_del (&req->list);
+		usb_ep_free_request (ep, req);
+
+		if (next == list)
+			break;
+
+		req = container_of (next, struct usb_request, list);
+	}
+	return 0;
+}
+
+static int alloc_requests (struct eth_dev *dev, unsigned n, int gfp_flags)
+{
+	int status;
+
+	status = prealloc (&dev->tx_reqs, dev->in_ep, n, gfp_flags);
+	if (status < 0)
+		goto fail;
+	status = prealloc (&dev->rx_reqs, dev->out_ep, n, gfp_flags);
+	if (status < 0)
+		goto fail;
+	return 0;
+fail:
+	DEBUG (dev, "can't alloc requests\n");
+	return status;
+}
+
+static void rx_fill (struct eth_dev *dev, int gfp_flags)
+{
+	struct usb_request	*req;
+	unsigned long		flags;
+
+	clear_bit (WORK_RX_MEMORY, &dev->todo);
+
+	/* fill unused rxq slots with some skb */
+	spin_lock_irqsave (&dev->lock, flags);
+	while (!list_empty (&dev->rx_reqs)) {
+		req = container_of (dev->rx_reqs.next,
+				struct usb_request, list);
+		list_del_init (&req->list);
+		spin_unlock_irqrestore (&dev->lock, flags);
+
+		if (rx_submit (dev, req, gfp_flags) < 0) {
+			defer_kevent (dev, WORK_RX_MEMORY);
+			return;
+		}
+
+		spin_lock_irqsave (&dev->lock, flags);
+	}
+	spin_unlock_irqrestore (&dev->lock, flags);
+}
+
+static void eth_work (void *_dev)
+{
+	struct eth_dev		*dev = _dev;
+
+	if (test_bit (WORK_RX_MEMORY, &dev->todo)) {
+		if (netif_running (dev->net))
+			rx_fill (dev, GFP_KERNEL);
+		else
+			clear_bit (WORK_RX_MEMORY, &dev->todo);
+	}
+
+	if (dev->todo)
+		DEBUG (dev, "work done, flags = 0x%lx\n", dev->todo);
+}
+
+static void tx_complete (struct usb_ep *ep, struct usb_request *req)
+{
+	struct sk_buff	*skb = req->context;
+	struct eth_dev	*dev = ep->driver_data;
+
+	switch (req->status) {
+	default:
+		dev->stats.tx_errors++;
+		VDEBUG (dev, "tx err %d\n", req->status);
+		/* FALLTHROUGH */
+	case -ECONNRESET:		// unlink
+	case -ESHUTDOWN:		// disconnect etc
+		break;
+	case 0:
+		dev->stats.tx_bytes += skb->len;
+	}
+	dev->stats.tx_packets++;
+
+	spin_lock (&dev->lock);
+	list_add (&req->list, &dev->tx_reqs);
+	spin_unlock (&dev->lock);
+	dev_kfree_skb_any (skb);
+
+	atomic_dec (&dev->tx_qlen);
+	if (netif_carrier_ok (dev->net))
+		netif_wake_queue (dev->net);
+}
+
+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;
+}
+
+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 (dest [0] & 0x01) {
+			u16	type;
+
+			/* ignores USB_CDC_PACKET_TYPE_MULTICAST and host
+			 * SET_ETHERNET_MULTICAST_FILTERS requests
+			 */
+			if (memcmp (dest, net->broadcast, ETH_ALEN) == 0)
+				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->lock, flags);
+	req = container_of (dev->tx_reqs.next, struct usb_request, list);
+	list_del (&req->list);
+	if (list_empty (&dev->tx_reqs))
+		netif_stop_queue (net);
+	spin_unlock_irqrestore (&dev->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
+	 */
+#ifdef CONFIG_USB_ETH_RNDIS
+	if (dev->rndis) {
+		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;
+	}
+#endif
+	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;
+
+#ifdef	CONFIG_USB_GADGET_DUALSPEED
+	/* throttle highspeed IRQ rate back slightly */
+	req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH)
+		? ((atomic_read (&dev->tx_qlen) % TX_DELAY) != 0)
+		: 0;
+#endif
+
+	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) {
+#ifdef CONFIG_USB_ETH_RNDIS
+drop:
+#endif
+		dev->stats.tx_dropped++;
+		dev_kfree_skb_any (skb);
+		spin_lock_irqsave (&dev->lock, flags);
+		if (list_empty (&dev->tx_reqs))
+			netif_start_queue (net);
+		list_add (&req->list, &dev->tx_reqs);
+		spin_unlock_irqrestore (&dev->lock, flags);
+	}
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef CONFIG_USB_ETH_RNDIS
+
+static void rndis_send_media_state (struct eth_dev *dev, int connect)
+{
+	if (!dev)
+		return;
+	
+	if (connect) {
+		if (rndis_signal_connect (dev->rndis_config))
+			return;
+	} else {
+		if (rndis_signal_disconnect (dev->rndis_config))
+			return;
+	}
+}
+
+static void
+rndis_control_ack_complete (struct usb_ep *ep, struct usb_request *req)
+{
+	if (req->status || req->actual != req->length)
+		DEBUG ((struct eth_dev *) ep->driver_data,
+			"rndis control ack complete --> %d, %d/%d\n",
+			req->status, req->actual, req->length);
+
+	usb_ep_free_buffer(ep, req->buf, req->dma, 8);
+	usb_ep_free_request(ep, req);
+}
+
+static int rndis_control_ack (struct net_device *net)
+{
+	struct eth_dev          *dev = netdev_priv(net);
+	u32                     length;
+	struct usb_request      *resp;
+	
+	/* in case RNDIS calls this after disconnect */
+	if (!dev->status_ep) {
+		DEBUG (dev, "status ENODEV\n");
+		return -ENODEV;
+	}
+
+	/* Allocate memory for notification ie. ACK */
+	resp = usb_ep_alloc_request (dev->status_ep, GFP_ATOMIC);
+	if (!resp) {
+		DEBUG (dev, "status ENOMEM\n");
+		return -ENOMEM;
+	}
+	
+	resp->buf = usb_ep_alloc_buffer (dev->status_ep, 8,
+					 &resp->dma, GFP_ATOMIC);
+	if (!resp->buf) {
+		DEBUG (dev, "status buf ENOMEM\n");
+		usb_ep_free_request (dev->status_ep, resp);
+		return -ENOMEM;
+	}
+	
+	/* Send RNDIS RESPONSE_AVAILABLE notification;
+	 * USB_CDC_NOTIFY_RESPONSE_AVAILABLE should work too
+	 */
+	resp->length = 8;
+	resp->complete = rndis_control_ack_complete;
+	
+	*((__le32 *) resp->buf) = __constant_cpu_to_le32 (1);
+	*((__le32 *) resp->buf + 1) = __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;
+}
+
+#endif	/* RNDIS */
+
+static void eth_start (struct eth_dev *dev, int gfp_flags)
+{
+	DEBUG (dev, "%s\n", __FUNCTION__);
+
+	/* fill the rx queue */
+	rx_fill (dev, gfp_flags);
+
+	/* and open the tx floodgates */ 
+	atomic_set (&dev->tx_qlen, 0);
+	netif_wake_queue (dev->net);
+#ifdef CONFIG_USB_ETH_RNDIS
+	if (dev->rndis) {
+		rndis_set_param_medium (dev->rndis_config,
+					NDIS_MEDIUM_802_3,
+					BITRATE(dev->gadget));
+		rndis_send_media_state (dev, 1);
+	}
+#endif	
+}
+
+static int eth_open (struct net_device *net)
+{
+	struct eth_dev		*dev = netdev_priv(net);
+
+	DEBUG (dev, "%s\n", __FUNCTION__);
+	if (netif_carrier_ok (dev->net))
+		eth_start (dev, GFP_KERNEL);
+	return 0;
+}
+
+static int eth_stop (struct net_device *net)
+{
+	struct eth_dev		*dev = netdev_priv(net);
+
+	VDEBUG (dev, "%s\n", __FUNCTION__);
+	netif_stop_queue (net);
+
+	DEBUG (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n",
+		dev->stats.rx_packets, dev->stats.tx_packets, 
+		dev->stats.rx_errors, dev->stats.tx_errors
+		);
+
+	/* ensure there are no more active requests */
+	if (dev->config) {
+		usb_ep_disable (dev->in_ep);
+		usb_ep_disable (dev->out_ep);
+		if (netif_carrier_ok (dev->net)) {
+			DEBUG (dev, "host still using in/out endpoints\n");
+			// FIXME idiom may leave toggle wrong here
+			usb_ep_enable (dev->in_ep, dev->in);
+			usb_ep_enable (dev->out_ep, dev->out);
+		}
+		if (dev->status_ep) {
+			usb_ep_disable (dev->status_ep);
+			usb_ep_enable (dev->status_ep, dev->status);
+		}
+	}
+	
+#ifdef	CONFIG_USB_ETH_RNDIS
+	if (dev->rndis) {
+		rndis_set_param_medium (dev->rndis_config,
+					NDIS_MEDIUM_802_3, 0);
+		rndis_send_media_state (dev, 0);
+	}
+#endif
+
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static struct usb_request *eth_req_alloc (struct usb_ep *ep, unsigned size)
+{
+	struct usb_request	*req;
+
+	req = usb_ep_alloc_request (ep, GFP_KERNEL);
+	if (!req)
+		return NULL;
+
+	req->buf = kmalloc (size, GFP_KERNEL);
+	if (!req->buf) {
+		usb_ep_free_request (ep, req);
+		req = NULL;
+	}
+	return req;
+}
+
+static void
+eth_req_free (struct usb_ep *ep, struct usb_request *req)
+{
+	kfree (req->buf);
+	usb_ep_free_request (ep, req);
+}
+
+
+static void
+eth_unbind (struct usb_gadget *gadget)
+{
+	struct eth_dev		*dev = get_gadget_data (gadget);
+
+	DEBUG (dev, "unbind\n");
+#ifdef CONFIG_USB_ETH_RNDIS
+	rndis_deregister (dev->rndis_config);
+	rndis_exit ();
+#endif
+
+	/* we've already been disconnected ... no i/o is active */
+	if (dev->req) {
+		eth_req_free (gadget->ep0, dev->req);
+		dev->req = NULL;
+	}
+	if (dev->stat_req) {
+		eth_req_free (dev->status_ep, dev->stat_req);
+		dev->stat_req = NULL;
+	}
+
+	unregister_netdev (dev->net);
+	free_netdev(dev->net);
+
+	/* assuming we used keventd, it must quiesce too */
+	flush_scheduled_work ();
+	set_gadget_data (gadget, NULL);
+}
+
+static u8 __init 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 void __init 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;
+	}
+	random_ether_addr(dev_addr);
+}
+
+static int __init
+eth_bind (struct usb_gadget *gadget)
+{
+	struct eth_dev		*dev;
+	struct net_device	*net;
+	u8			cdc = 1, zlp = 1, rndis = 1;
+	struct usb_ep		*in_ep, *out_ep, *status_ep = NULL;
+	int			status = -ENOMEM;
+
+	/* these flags are only ever cleared; compiler take note */
+#ifndef	DEV_CONFIG_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_net2280 (gadget)) {
+		device_desc.bcdDevice = __constant_cpu_to_le16 (0x0201);
+	} else if (gadget_is_dummy (gadget)) {
+		device_desc.bcdDevice = __constant_cpu_to_le16 (0x0202);
+	} else if (gadget_is_pxa (gadget)) {
+		device_desc.bcdDevice = __constant_cpu_to_le16 (0x0203);
+		/* pxa doesn't support altsettings */
+		cdc = 0;
+	} else if (gadget_is_sh(gadget)) {
+		device_desc.bcdDevice = __constant_cpu_to_le16 (0x0204);
+		/* sh doesn't support multiple interfaces or configs */
+		cdc = 0;
+		rndis = 0;
+	} else if (gadget_is_sa1100 (gadget)) {
+		device_desc.bcdDevice = __constant_cpu_to_le16 (0x0205);
+		/* 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;
+	} else if (gadget_is_goku (gadget)) {
+		device_desc.bcdDevice = __constant_cpu_to_le16 (0x0206);
+	} else if (gadget_is_mq11xx (gadget)) {
+		device_desc.bcdDevice = __constant_cpu_to_le16 (0x0207);
+	} else if (gadget_is_omap (gadget)) {
+		device_desc.bcdDevice = __constant_cpu_to_le16 (0x0208);
+	} else if (gadget_is_lh7a40x(gadget)) {
+		device_desc.bcdDevice = __constant_cpu_to_le16 (0x0209);
+	} else if (gadget_is_n9604(gadget)) {
+		device_desc.bcdDevice = __constant_cpu_to_le16 (0x0210);
+	} else if (gadget_is_pxa27x(gadget)) {
+		device_desc.bcdDevice = __constant_cpu_to_le16 (0x0211);
+ 	} else if (gadget_is_s3c2410(gadget)) {
+ 		device_desc.bcdDevice = __constant_cpu_to_le16 (0x0212);
+	} else if (gadget_is_at91(gadget)) {
+		device_desc.bcdDevice = __constant_cpu_to_le16 (0x0213);
+	} 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.
+		 */
+		dev_err (&gadget->dev,
+			"controller '%s' not recognized\n",
+			gadget->name);
+		return -ENODEV;
+	}
+	snprintf (manufacturer, sizeof manufacturer, "%s %s/%s",
+		system_utsname.sysname, system_utsname.release,
+		gadget->name);
+
+	/* 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) {
+		device_desc.idVendor =
+			__constant_cpu_to_le16(RNDIS_VENDOR_NUM);
+		device_desc.idProduct =
+			__constant_cpu_to_le16(RNDIS_PRODUCT_NUM);
+		snprintf (product_desc, sizeof product_desc,
+			"RNDIS/%s", driver_desc);
+
+	/* CDC subset ... recognized by Linux since 2.4.10, but Windows
+	 * drivers aren't widely available.
+	 */
+	} else if (!cdc) {
+		device_desc.bDeviceClass = USB_CLASS_VENDOR_SPEC;
+		device_desc.idVendor =
+			__constant_cpu_to_le16(SIMPLE_VENDOR_NUM);
+		device_desc.idProduct =
+			__constant_cpu_to_le16(SIMPLE_PRODUCT_NUM);
+	}
+
+	/* support optional vendor/distro customization */
+	if (idVendor) {
+		if (!idProduct) {
+			dev_err (&gadget->dev, "idVendor needs idProduct!\n");
+			return -ENODEV;
+		}
+		device_desc.idVendor = cpu_to_le16(idVendor);
+		device_desc.idProduct = cpu_to_le16(idProduct);
+		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);
+
+	/* 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:
+		dev_err (&gadget->dev,
+			"can't autoconfigure on %s\n",
+			gadget->name);
+		return -ENODEV;
+	}
+	EP_IN_NAME = in_ep->name;
+	in_ep->driver_data = in_ep;	/* claim */
+	
+	out_ep = usb_ep_autoconfig (gadget, &fs_sink_desc);
+	if (!out_ep)
+		goto autoconf_fail;
+	EP_OUT_NAME = out_ep->name;
+	out_ep->driver_data = out_ep;	/* claim */
+
+#if defined(DEV_CONFIG_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) {
+			EP_STATUS_NAME = status_ep->name;
+			status_ep->driver_data = status_ep;	/* claim */
+		} else if (rndis) {
+			dev_err (&gadget->dev,
+				"can't run RNDIS on %s\n",
+				gadget->name);
+			return -ENODEV;
+#ifdef DEV_CONFIG_CDC
+		/* pxa25x only does CDC subset; often used with RNDIS */
+		} 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;
+		fs_subset_descriptors();
+		hs_subset_descriptors();
+	}
+
+	/* For now RNDIS is always a second config */
+	if (rndis)
+		device_desc.bNumConfigurations = 2;
+
+#ifdef	CONFIG_USB_GADGET_DUALSPEED
+	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(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
+	if (EP_STATUS_NAME)
+		hs_status_desc.bEndpointAddress =
+				fs_status_desc.bEndpointAddress;
+#endif
+#endif	/* DUALSPEED */
+
+	device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
+	usb_gadget_set_selfpowered (gadget);
+
+	if (gadget->is_otg) {
+		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
+	}
+
+ 	net = alloc_etherdev (sizeof *dev);
+ 	if (!net)
+		return status;
+	dev = netdev_priv(net);
+	spin_lock_init (&dev->lock);
+	INIT_WORK (&dev->work, eth_work, dev);
+	INIT_LIST_HEAD (&dev->tx_reqs);
+	INIT_LIST_HEAD (&dev->rx_reqs);
+
+	/* network device setup */
+	dev->net = net;
+	SET_MODULE_OWNER (net);
+	strcpy (net->name, "usb%d");
+	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.
+	 */
+	get_ether_addr(dev_addr, net->dev_addr);
+	if (cdc || rndis) {
+		get_ether_addr(host_addr, dev->host_mac);
+#ifdef	DEV_CONFIG_CDC
+		snprintf (ethaddr, sizeof 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]);
+#endif
+	}
+
+	if (rndis) {
+		status = rndis_init();
+		if (status < 0) {
+			dev_err (&gadget->dev, "can't init RNDIS, %d\n",
+				status);
+			goto fail;
+		}
+	}
+
+	net->change_mtu = eth_change_mtu;
+	net->get_stats = eth_get_stats;
+	net->hard_start_xmit = eth_start_xmit;
+	net->open = eth_open;
+	net->stop = eth_stop;
+	// watchdog_timeo, tx_timeout ...
+	// set_multicast_list
+	SET_ETHTOOL_OPS(net, &ops);
+
+	/* preallocate control message data and buffer */
+	dev->req = eth_req_alloc (gadget->ep0, USB_BUFSIZ);
+	if (!dev->req)
+		goto fail;
+	dev->req->complete = eth_setup_complete;
+
+	/* ... and maybe likewise for status transfer */
+	if (dev->status_ep) {
+		dev->stat_req = eth_req_alloc (dev->status_ep,
+					STATUS_BYTECOUNT);
+		if (!dev->stat_req) {
+			eth_req_free (gadget->ep0, dev->req);
+			goto fail;
+		}
+	}
+
+	/* 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"
+	 */
+	netif_stop_queue (dev->net);
+	netif_carrier_off (dev->net);
+
+ 	// SET_NETDEV_DEV (dev->net, &gadget->dev);
+ 	status = register_netdev (dev->net);
+	if (status < 0)
+		goto fail1;
+
+	INFO (dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
+	INFO (dev, "using %s, OUT %s IN %s%s%s\n", gadget->name,
+		EP_OUT_NAME, EP_IN_NAME,
+		EP_STATUS_NAME ? " STATUS " : "",
+		EP_STATUS_NAME ? EP_STATUS_NAME : ""
+		);
+	INFO (dev, "MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
+		net->dev_addr [0], net->dev_addr [1],
+		net->dev_addr [2], net->dev_addr [3],
+		net->dev_addr [4], net->dev_addr [5]);
+
+	if (cdc || rndis)
+		INFO (dev, "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]);
+
+#ifdef	CONFIG_USB_ETH_RNDIS
+	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:
+			unregister_netdev (dev->net);
+			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->stats))
+			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;
+		INFO (dev, "RNDIS ready\n");
+	}
+#endif	
+
+	return status;
+
+fail1:
+	dev_dbg(&gadget->dev, "register_netdev failed, %d\n", status);
+fail:
+	eth_unbind (gadget);
+	return status;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void
+eth_suspend (struct usb_gadget *gadget)
+{
+	struct eth_dev		*dev = get_gadget_data (gadget);
+
+	DEBUG (dev, "suspend\n");
+	dev->suspended = 1;
+}
+
+static void
+eth_resume (struct usb_gadget *gadget)
+{
+	struct eth_dev		*dev = get_gadget_data (gadget);
+
+	DEBUG (dev, "resume\n");
+	dev->suspended = 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static struct usb_gadget_driver eth_driver = {
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+	.speed		= USB_SPEED_HIGH,
+#else
+	.speed		= USB_SPEED_FULL,
+#endif
+	.function	= (char *) driver_desc,
+	.bind		= eth_bind,
+	.unbind		= eth_unbind,
+
+	.setup		= eth_setup,
+	.disconnect	= eth_disconnect,
+
+	.suspend	= eth_suspend,
+	.resume		= eth_resume,
+
+	.driver 	= {
+		.name		= (char *) shortname,
+		// .shutdown = ...
+		// .suspend = ...
+		// .resume = ...
+	},
+};
+
+MODULE_DESCRIPTION (DRIVER_DESC);
+MODULE_AUTHOR ("David Brownell, Benedikt Spanger");
+MODULE_LICENSE ("GPL");
+
+
+static int __init init (void)
+{
+	return usb_gadget_register_driver (&eth_driver);
+}
+module_init (init);
+
+static void __exit cleanup (void)
+{
+	usb_gadget_unregister_driver (&eth_driver);
+}
+module_exit (cleanup);
+