drivers/net/usb/zaurus.c - third_party/kernel - Git at Google

 /*
  * Copyright (C) 2002 Pavel Machek <pavel@ucw.cz>
  * Copyright (C) 2002-2005 by David Brownell
  *
  * 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, see <http://www.gnu.org/licenses/>.
  */

 // #define	DEBUG			// error path messages, extra info
 // #define	VERBOSE			// more; success messages

 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/ethtool.h>
 #include <linux/workqueue.h>
 #include <linux/mii.h>
 #include <linux/crc32.h>
 #include <linux/usb.h>
 #include <linux/usb/cdc.h>
 #include <linux/usb/usbnet.h>


 /*
  * All known Zaurii lie about their standards conformance.  At least
  * the earliest SA-1100 models lie by saying they support CDC Ethernet.
  * Some later models (especially PXA-25x and PXA-27x based ones) lie
  * and say they support CDC MDLM (for access to cell phone modems).
  *
  * There are non-Zaurus products that use these same protocols too.
  *
  * The annoying thing is that at the same time Sharp was developing
  * that annoying standards-breaking software, the Linux community had
  * a simple "CDC Subset" working reliably on the same SA-1100 hardware.
  * That is, the same functionality but not violating standards.
  *
  * The CDC Ethernet nonconformance points are troublesome to hosts
  * with a true CDC Ethernet implementation:
  *   - Framing appends a CRC, which the spec says drivers "must not" do;
  *   - Transfers data in altsetting zero, instead of altsetting 1;
  *   - All these peripherals use the same ethernet address.
  *
  * The CDC MDLM nonconformance is less immediately troublesome, since all
  * MDLM implementations are quasi-proprietary anyway.
  */

 static struct sk_buff *
 zaurus_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
 {
 	int			padlen;
 	struct sk_buff		*skb2;

 	padlen = 2;
 	if (!skb_cloned(skb)) {
 		int	tailroom = skb_tailroom(skb);
 		if ((padlen + 4) <= tailroom)
 			goto done;
 	}
 	skb2 = skb_copy_expand(skb, 0, 4 + padlen, flags);
 	dev_kfree_skb_any(skb);
 	skb = skb2;
 	if (skb) {
 		u32		fcs;
 done:
 		fcs = crc32_le(~0, skb->data, skb->len);
 		fcs = ~fcs;

 		skb_put_u8(skb, fcs & 0xff);
 		skb_put_u8(skb, (fcs >> 8) & 0xff);
 		skb_put_u8(skb, (fcs >> 16) & 0xff);
 		skb_put_u8(skb, (fcs >> 24) & 0xff);
 	}
 	return skb;
 }

 static int zaurus_bind(struct usbnet *dev, struct usb_interface *intf)
 {
 	/* Belcarra's funky framing has other options; mostly
 	 * TRAILERS (!) with 4 bytes CRC, and maybe 2 pad bytes.
 	 */
 	dev->net->hard_header_len += 6;
 	dev->rx_urb_size = dev->net->hard_header_len + dev->net->mtu;
 	return usbnet_generic_cdc_bind(dev, intf);
 }

 /* PDA style devices are always connected if present */
 static int always_connected (struct usbnet *dev)
 {
 	return 0;
 }

 static const struct driver_info	zaurus_sl5x00_info = {
 	.description =	"Sharp Zaurus SL-5x00",
 	.flags =	FLAG_POINTTOPOINT | FLAG_FRAMING_Z,
 	.check_connect = always_connected,
 	.bind =		zaurus_bind,
 	.unbind =	usbnet_cdc_unbind,
 	.tx_fixup =	zaurus_tx_fixup,
 };
 #define	ZAURUS_STRONGARM_INFO	((unsigned long)&zaurus_sl5x00_info)

 static const struct driver_info	zaurus_pxa_info = {
 	.description =	"Sharp Zaurus, PXA-2xx based",
 	.flags =	FLAG_POINTTOPOINT | FLAG_FRAMING_Z,
 	.check_connect = always_connected,
 	.bind =		zaurus_bind,
 	.unbind =	usbnet_cdc_unbind,
 	.tx_fixup =	zaurus_tx_fixup,
 };
 #define	ZAURUS_PXA_INFO		((unsigned long)&zaurus_pxa_info)

 static const struct driver_info	olympus_mxl_info = {
 	.description =	"Olympus R1000",
 	.flags =	FLAG_POINTTOPOINT | FLAG_FRAMING_Z,
 	.check_connect = always_connected,
 	.bind =		zaurus_bind,
 	.unbind =	usbnet_cdc_unbind,
 	.tx_fixup =	zaurus_tx_fixup,
 };
 #define	OLYMPUS_MXL_INFO	((unsigned long)&olympus_mxl_info)


 /* Some more recent products using Lineo/Belcarra code will wrongly claim
  * CDC MDLM conformance.  They aren't conformant:  data endpoints live
  * in the control interface, there's no data interface, and it's not used
  * to talk to a cell phone radio.  But at least we can detect these two
  * pseudo-classes, rather than growing this product list with entries for
  * each new nonconformant product (sigh).
  */
 static const u8 safe_guid[16] = {
 	0x5d, 0x34, 0xcf, 0x66, 0x11, 0x18, 0x11, 0xd6,
 	0xa2, 0x1a, 0x00, 0x01, 0x02, 0xca, 0x9a, 0x7f,
 };
 static const u8 blan_guid[16] = {
 	0x74, 0xf0, 0x3d, 0xbd, 0x1e, 0xc1, 0x44, 0x70,
 	0xa3, 0x67, 0x71, 0x34, 0xc9, 0xf5, 0x54, 0x37,
 };

 static int blan_mdlm_bind(struct usbnet *dev, struct usb_interface *intf)
 {
 	u8				*buf = intf->cur_altsetting->extra;
 	int				len = intf->cur_altsetting->extralen;
 	struct usb_cdc_mdlm_desc	*desc = NULL;
 	struct usb_cdc_mdlm_detail_desc	*detail = NULL;

 	while (len > 3) {
 		if (buf [1] != USB_DT_CS_INTERFACE)
 			goto next_desc;

 		/* use bDescriptorSubType, and just verify that we get a
 		 * "BLAN" (or "SAFE") descriptor.
 		 */
 		switch (buf [2]) {
 		case USB_CDC_MDLM_TYPE:
 			if (desc) {
 				dev_dbg(&intf->dev, "extra MDLM\n");
 				goto bad_desc;
 			}
 			desc = (void *) buf;
 			if (desc->bLength != sizeof *desc) {
 				dev_dbg(&intf->dev, "MDLM len %u\n",
 					desc->bLength);
 				goto bad_desc;
 			}
 			/* expect bcdVersion 1.0, ignore */
 			if (memcmp(&desc->bGUID, blan_guid, 16) &&
 			    memcmp(&desc->bGUID, safe_guid, 16)) {
 				/* hey, this one might _really_ be MDLM! */
 				dev_dbg(&intf->dev, "MDLM guid\n");
 				goto bad_desc;
 			}
 			break;
 		case USB_CDC_MDLM_DETAIL_TYPE:
 			if (detail) {
 				dev_dbg(&intf->dev, "extra MDLM detail\n");
 				goto bad_desc;
 			}
 			detail = (void *) buf;
 			switch (detail->bGuidDescriptorType) {
 			case 0:			/* "SAFE" */
 				if (detail->bLength != (sizeof *detail + 2))
 					goto bad_detail;
 				break;
 			case 1:			/* "BLAN" */
 				if (detail->bLength != (sizeof *detail + 3))
 					goto bad_detail;
 				break;
 			default:
 				goto bad_detail;
 			}

 			/* assuming we either noticed BLAN already, or will
 			 * find it soon, there are some data bytes here:
 			 *  - bmNetworkCapabilities (unused)
 			 *  - bmDataCapabilities (bits, see below)
 			 *  - bPad (ignored, for PADAFTER -- BLAN-only)
 			 * bits are:
 			 *  - 0x01 -- Zaurus framing (add CRC)
 			 *  - 0x02 -- PADBEFORE (CRC includes some padding)
 			 *  - 0x04 -- PADAFTER (some padding after CRC)
 			 *  - 0x08 -- "fermat" packet mangling (for hw bugs)
 			 * the PADBEFORE appears not to matter; we interop
 			 * with devices that use it and those that don't.
 			 */
 			if ((detail->bDetailData[1] & ~0x02) != 0x01) {
 				/* bmDataCapabilities == 0 would be fine too,
 				 * but framing is minidriver-coupled for now.
 				 */
 bad_detail:
 				dev_dbg(&intf->dev,
 						"bad MDLM detail, %d %d %d\n",
 						detail->bLength,
 						detail->bDetailData[0],
 						detail->bDetailData[2]);
 				goto bad_desc;
 			}

 			/* same extra framing as for non-BLAN mode */
 			dev->net->hard_header_len += 6;
 			dev->rx_urb_size = dev->net->hard_header_len
 					+ dev->net->mtu;
 			break;
 		}
 next_desc:
 		len -= buf [0];	/* bLength */
 		buf += buf [0];
 	}

 	if (!desc || !detail) {
 		dev_dbg(&intf->dev, "missing cdc mdlm %s%sdescriptor\n",
 			desc ? "" : "func ",
 			detail ? "" : "detail ");
 		goto bad_desc;
 	}

 	/* There's probably a CDC Ethernet descriptor there, but we can't
 	 * rely on the Ethernet address it provides since not all vendors
 	 * bother to make it unique.  Likewise there's no point in tracking
 	 * of the CDC event notifications.
 	 */
 	return usbnet_get_endpoints(dev, intf);

 bad_desc:
 	dev_info(&dev->udev->dev, "unsupported MDLM descriptors\n");
 	return -ENODEV;
 }

 static const struct driver_info	bogus_mdlm_info = {
 	.description =	"pseudo-MDLM (BLAN) device",
 	.flags =	FLAG_POINTTOPOINT | FLAG_FRAMING_Z,
 	.check_connect = always_connected,
 	.tx_fixup =	zaurus_tx_fixup,
 	.bind =		blan_mdlm_bind,
 };

 static const struct usb_device_id	products [] = {
 #define	ZAURUS_MASTER_INTERFACE \
 	.bInterfaceClass	= USB_CLASS_COMM, \
 	.bInterfaceSubClass	= USB_CDC_SUBCLASS_ETHERNET, \
 	.bInterfaceProtocol	= USB_CDC_PROTO_NONE

 /* SA-1100 based Sharp Zaurus ("collie"), or compatible. */
 {
 	.match_flags	=   USB_DEVICE_ID_MATCH_INT_INFO
 			  | USB_DEVICE_ID_MATCH_DEVICE,
 	.idVendor		= 0x04DD,
 	.idProduct		= 0x8004,
 	ZAURUS_MASTER_INTERFACE,
 	.driver_info = ZAURUS_STRONGARM_INFO,
 },

 /* PXA-2xx based models are also lying-about-cdc.  If you add any
  * more devices that claim to be CDC Ethernet, make sure they get
  * added to the blacklist in cdc_ether too.
  *
  * NOTE:  OpenZaurus versions with 2.6 kernels won't use these entries,
  * unlike the older ones with 2.4 "embedix" kernels.
  */
 {
 	.match_flags	=   USB_DEVICE_ID_MATCH_INT_INFO
 			  | USB_DEVICE_ID_MATCH_DEVICE,
 	.idVendor		= 0x04DD,
 	.idProduct		= 0x8005,	/* A-300 */
 	ZAURUS_MASTER_INTERFACE,
 	.driver_info = ZAURUS_PXA_INFO,
 }, {
 	.match_flags	=   USB_DEVICE_ID_MATCH_INT_INFO
 			  | USB_DEVICE_ID_MATCH_DEVICE,
 	.idVendor		= 0x04DD,
 	.idProduct		= 0x8006,	/* B-500/SL-5600 */
 	ZAURUS_MASTER_INTERFACE,
 	.driver_info = ZAURUS_PXA_INFO,
 }, {
 	.match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 	          | USB_DEVICE_ID_MATCH_DEVICE,
 	.idVendor		= 0x04DD,
 	.idProduct		= 0x8007,	/* C-700 */
 	ZAURUS_MASTER_INTERFACE,
 	.driver_info = ZAURUS_PXA_INFO,
 }, {
 	.match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 		 | USB_DEVICE_ID_MATCH_DEVICE,
 	.idVendor               = 0x04DD,
 	.idProduct              = 0x9031,	/* C-750 C-760 */
 	ZAURUS_MASTER_INTERFACE,
 	.driver_info = ZAURUS_PXA_INFO,
 }, {
 	/* C-750/C-760/C-860/SL-C3000 PDA in MDLM mode */
 	USB_DEVICE_AND_INTERFACE_INFO(0x04DD, 0x9031, USB_CLASS_COMM,
 			USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
 	.driver_info = (unsigned long) &bogus_mdlm_info,
 }, {
 	.match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 		 | USB_DEVICE_ID_MATCH_DEVICE,
 	.idVendor               = 0x04DD,
 	.idProduct              = 0x9032,	/* SL-6000 */
 	ZAURUS_MASTER_INTERFACE,
 	.driver_info = ZAURUS_PXA_INFO,
 }, {
 	.match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 		 | USB_DEVICE_ID_MATCH_DEVICE,
 	.idVendor               = 0x04DD,
 	/* reported with some C860 units */
 	.idProduct              = 0x9050,	/* C-860 */
 	ZAURUS_MASTER_INTERFACE,
 	.driver_info = ZAURUS_PXA_INFO,
 },
 {
 	/* Motorola Rokr E6 */
 	USB_DEVICE_AND_INTERFACE_INFO(0x22b8, 0x6027, USB_CLASS_COMM,
 			USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
 	.driver_info = (unsigned long) &bogus_mdlm_info,
 }, {
 	/* Motorola MOTOMAGX phones */
 	USB_DEVICE_AND_INTERFACE_INFO(0x22b8, 0x6425, USB_CLASS_COMM,
 			USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
 	.driver_info = (unsigned long) &bogus_mdlm_info,
 },

 /* Olympus has some models with a Zaurus-compatible option.
  * R-1000 uses a FreeScale i.MXL cpu (ARMv4T)
  */
 {
 	.match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 		 | USB_DEVICE_ID_MATCH_DEVICE,
 	.idVendor               = 0x07B4,
 	.idProduct              = 0x0F02,	/* R-1000 */
 	ZAURUS_MASTER_INTERFACE,
 	.driver_info = OLYMPUS_MXL_INFO,
 },

 /* Logitech Harmony 900 - uses the pseudo-MDLM (BLAN) driver */
 {
 	USB_DEVICE_AND_INTERFACE_INFO(0x046d, 0xc11f, USB_CLASS_COMM,
 			USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
 	.driver_info = (unsigned long) &bogus_mdlm_info,
 },
 	{ },		// END
 };
 MODULE_DEVICE_TABLE(usb, products);

 static struct usb_driver zaurus_driver = {
 	.name =		"zaurus",
 	.id_table =	products,
 	.probe =	usbnet_probe,
 	.disconnect =	usbnet_disconnect,
 	.suspend =	usbnet_suspend,
 	.resume =	usbnet_resume,
 	.disable_hub_initiated_lpm = 1,
 };

 module_usb_driver(zaurus_driver);

 MODULE_AUTHOR("Pavel Machek, David Brownell");
 MODULE_DESCRIPTION("Sharp Zaurus PDA, and compatible products");
 MODULE_LICENSE("GPL");
	/*
	* Copyright (C) 2002 Pavel Machek <pavel@ucw.cz>
	* Copyright (C) 2002-2005 by David Brownell
	*
	* 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, see <http://www.gnu.org/licenses/>.
	*/

	// #define DEBUG // error path messages, extra info
	// #define VERBOSE // more; success messages

	#include <linux/module.h>
	#include <linux/netdevice.h>
	#include <linux/ethtool.h>
	#include <linux/workqueue.h>
	#include <linux/mii.h>
	#include <linux/crc32.h>
	#include <linux/usb.h>
	#include <linux/usb/cdc.h>
	#include <linux/usb/usbnet.h>


	/*
	* All known Zaurii lie about their standards conformance. At least
	* the earliest SA-1100 models lie by saying they support CDC Ethernet.
	* Some later models (especially PXA-25x and PXA-27x based ones) lie
	* and say they support CDC MDLM (for access to cell phone modems).
	*
	* There are non-Zaurus products that use these same protocols too.
	*
	* The annoying thing is that at the same time Sharp was developing
	* that annoying standards-breaking software, the Linux community had
	* a simple "CDC Subset" working reliably on the same SA-1100 hardware.
	* That is, the same functionality but not violating standards.
	*
	* The CDC Ethernet nonconformance points are troublesome to hosts
	* with a true CDC Ethernet implementation:
	* - Framing appends a CRC, which the spec says drivers "must not" do;
	* - Transfers data in altsetting zero, instead of altsetting 1;
	* - All these peripherals use the same ethernet address.
	*
	* The CDC MDLM nonconformance is less immediately troublesome, since all
	* MDLM implementations are quasi-proprietary anyway.
	*/

	static struct sk_buff *
	zaurus_tx_fixup(struct usbnet dev, struct sk_buff skb, gfp_t flags)
	{
	int padlen;
	struct sk_buff *skb2;

	padlen = 2;
	if (!skb_cloned(skb)) {
	int tailroom = skb_tailroom(skb);
	if ((padlen + 4) <= tailroom)
	goto done;
	}
	skb2 = skb_copy_expand(skb, 0, 4 + padlen, flags);
	dev_kfree_skb_any(skb);
	skb = skb2;
	if (skb) {
	u32 fcs;
	done:
	fcs = crc32_le(~0, skb->data, skb->len);
	fcs = ~fcs;

	skb_put_u8(skb, fcs & 0xff);
	skb_put_u8(skb, (fcs >> 8) & 0xff);
	skb_put_u8(skb, (fcs >> 16) & 0xff);
	skb_put_u8(skb, (fcs >> 24) & 0xff);
	}
	return skb;
	}

	static int zaurus_bind(struct usbnet dev, struct usb_interface intf)
	{
	/* Belcarra's funky framing has other options; mostly
	* TRAILERS (!) with 4 bytes CRC, and maybe 2 pad bytes.
	*/
	dev->net->hard_header_len += 6;
	dev->rx_urb_size = dev->net->hard_header_len + dev->net->mtu;
	return usbnet_generic_cdc_bind(dev, intf);
	}

	/* PDA style devices are always connected if present */
	static int always_connected (struct usbnet *dev)
	{
	return 0;
	}

	static const struct driver_info zaurus_sl5x00_info = {
	.description = "Sharp Zaurus SL-5x00",
	.flags = FLAG_POINTTOPOINT \| FLAG_FRAMING_Z,
	.check_connect = always_connected,
	.bind = zaurus_bind,
	.unbind = usbnet_cdc_unbind,
	.tx_fixup = zaurus_tx_fixup,
	};
	#define ZAURUS_STRONGARM_INFO ((unsigned long)&zaurus_sl5x00_info)

	static const struct driver_info zaurus_pxa_info = {
	.description = "Sharp Zaurus, PXA-2xx based",
	.flags = FLAG_POINTTOPOINT \| FLAG_FRAMING_Z,
	.check_connect = always_connected,
	.bind = zaurus_bind,
	.unbind = usbnet_cdc_unbind,
	.tx_fixup = zaurus_tx_fixup,
	};
	#define ZAURUS_PXA_INFO ((unsigned long)&zaurus_pxa_info)

	static const struct driver_info olympus_mxl_info = {
	.description = "Olympus R1000",
	.flags = FLAG_POINTTOPOINT \| FLAG_FRAMING_Z,
	.check_connect = always_connected,
	.bind = zaurus_bind,
	.unbind = usbnet_cdc_unbind,
	.tx_fixup = zaurus_tx_fixup,
	};
	#define OLYMPUS_MXL_INFO ((unsigned long)&olympus_mxl_info)


	/* Some more recent products using Lineo/Belcarra code will wrongly claim
	* CDC MDLM conformance. They aren't conformant: data endpoints live
	* in the control interface, there's no data interface, and it's not used
	* to talk to a cell phone radio. But at least we can detect these two
	* pseudo-classes, rather than growing this product list with entries for
	* each new nonconformant product (sigh).
	*/
	static const u8 safe_guid[16] = {
	0x5d, 0x34, 0xcf, 0x66, 0x11, 0x18, 0x11, 0xd6,
	0xa2, 0x1a, 0x00, 0x01, 0x02, 0xca, 0x9a, 0x7f,
	};
	static const u8 blan_guid[16] = {
	0x74, 0xf0, 0x3d, 0xbd, 0x1e, 0xc1, 0x44, 0x70,
	0xa3, 0x67, 0x71, 0x34, 0xc9, 0xf5, 0x54, 0x37,
	};

	static int blan_mdlm_bind(struct usbnet dev, struct usb_interface intf)
	{
	u8 *buf = intf->cur_altsetting->extra;
	int len = intf->cur_altsetting->extralen;
	struct usb_cdc_mdlm_desc *desc = NULL;
	struct usb_cdc_mdlm_detail_desc *detail = NULL;

	while (len > 3) {
	if (buf [1] != USB_DT_CS_INTERFACE)
	goto next_desc;

	/* use bDescriptorSubType, and just verify that we get a
	* "BLAN" (or "SAFE") descriptor.
	*/
	switch (buf [2]) {
	case USB_CDC_MDLM_TYPE:
	if (desc) {
	dev_dbg(&intf->dev, "extra MDLM\n");
	goto bad_desc;
	}
	desc = (void *) buf;
	if (desc->bLength != sizeof *desc) {
	dev_dbg(&intf->dev, "MDLM len %u\n",
	desc->bLength);
	goto bad_desc;
	}
	/* expect bcdVersion 1.0, ignore */
	if (memcmp(&desc->bGUID, blan_guid, 16) &&
	memcmp(&desc->bGUID, safe_guid, 16)) {
	/* hey, this one might _really_ be MDLM! */
	dev_dbg(&intf->dev, "MDLM guid\n");
	goto bad_desc;
	}
	break;
	case USB_CDC_MDLM_DETAIL_TYPE:
	if (detail) {
	dev_dbg(&intf->dev, "extra MDLM detail\n");
	goto bad_desc;
	}
	detail = (void *) buf;
	switch (detail->bGuidDescriptorType) {
	case 0: /* "SAFE" */
	if (detail->bLength != (sizeof *detail + 2))
	goto bad_detail;
	break;
	case 1: /* "BLAN" */
	if (detail->bLength != (sizeof *detail + 3))
	goto bad_detail;
	break;
	default:
	goto bad_detail;
	}

	/* assuming we either noticed BLAN already, or will
	* find it soon, there are some data bytes here:
	* - bmNetworkCapabilities (unused)
	* - bmDataCapabilities (bits, see below)
	* - bPad (ignored, for PADAFTER -- BLAN-only)
	* bits are:
	* - 0x01 -- Zaurus framing (add CRC)
	* - 0x02 -- PADBEFORE (CRC includes some padding)
	* - 0x04 -- PADAFTER (some padding after CRC)
	* - 0x08 -- "fermat" packet mangling (for hw bugs)
	* the PADBEFORE appears not to matter; we interop
	* with devices that use it and those that don't.
	*/
	if ((detail->bDetailData[1] & ~0x02) != 0x01) {
	/* bmDataCapabilities == 0 would be fine too,
	* but framing is minidriver-coupled for now.
	*/
	bad_detail:
	dev_dbg(&intf->dev,
	"bad MDLM detail, %d %d %d\n",
	detail->bLength,
	detail->bDetailData[0],
	detail->bDetailData[2]);
	goto bad_desc;
	}

	/* same extra framing as for non-BLAN mode */
	dev->net->hard_header_len += 6;
	dev->rx_urb_size = dev->net->hard_header_len
	+ dev->net->mtu;
	break;
	}
	next_desc:
	len -= buf [0]; /* bLength */
	buf += buf [0];
	}

	if (!desc \|\| !detail) {
	dev_dbg(&intf->dev, "missing cdc mdlm %s%sdescriptor\n",
	desc ? "" : "func ",
	detail ? "" : "detail ");
	goto bad_desc;
	}

	/* There's probably a CDC Ethernet descriptor there, but we can't
	* rely on the Ethernet address it provides since not all vendors
	* bother to make it unique. Likewise there's no point in tracking
	* of the CDC event notifications.
	*/
	return usbnet_get_endpoints(dev, intf);

	bad_desc:
	dev_info(&dev->udev->dev, "unsupported MDLM descriptors\n");
	return -ENODEV;
	}

	static const struct driver_info bogus_mdlm_info = {
	.description = "pseudo-MDLM (BLAN) device",
	.flags = FLAG_POINTTOPOINT \| FLAG_FRAMING_Z,
	.check_connect = always_connected,
	.tx_fixup = zaurus_tx_fixup,
	.bind = blan_mdlm_bind,
	};

	static const struct usb_device_id products [] = {
	#define ZAURUS_MASTER_INTERFACE \
	.bInterfaceClass = USB_CLASS_COMM, \
	.bInterfaceSubClass = USB_CDC_SUBCLASS_ETHERNET, \
	.bInterfaceProtocol = USB_CDC_PROTO_NONE

	/* SA-1100 based Sharp Zaurus ("collie"), or compatible. */
	{
	.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
	\| USB_DEVICE_ID_MATCH_DEVICE,
	.idVendor = 0x04DD,
	.idProduct = 0x8004,
	ZAURUS_MASTER_INTERFACE,
	.driver_info = ZAURUS_STRONGARM_INFO,
	},

	/* PXA-2xx based models are also lying-about-cdc. If you add any
	* more devices that claim to be CDC Ethernet, make sure they get
	* added to the blacklist in cdc_ether too.
	*
	* NOTE: OpenZaurus versions with 2.6 kernels won't use these entries,
	* unlike the older ones with 2.4 "embedix" kernels.
	*/
	{
	.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
	\| USB_DEVICE_ID_MATCH_DEVICE,
	.idVendor = 0x04DD,
	.idProduct = 0x8005, /* A-300 */
	ZAURUS_MASTER_INTERFACE,
	.driver_info = ZAURUS_PXA_INFO,
	}, {
	.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
	\| USB_DEVICE_ID_MATCH_DEVICE,
	.idVendor = 0x04DD,
	.idProduct = 0x8006, /* B-500/SL-5600 */
	ZAURUS_MASTER_INTERFACE,
	.driver_info = ZAURUS_PXA_INFO,
	}, {
	.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
	\| USB_DEVICE_ID_MATCH_DEVICE,
	.idVendor = 0x04DD,
	.idProduct = 0x8007, /* C-700 */
	ZAURUS_MASTER_INTERFACE,
	.driver_info = ZAURUS_PXA_INFO,
	}, {
	.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
	\| USB_DEVICE_ID_MATCH_DEVICE,
	.idVendor = 0x04DD,
	.idProduct = 0x9031, /* C-750 C-760 */
	ZAURUS_MASTER_INTERFACE,
	.driver_info = ZAURUS_PXA_INFO,
	}, {
	/* C-750/C-760/C-860/SL-C3000 PDA in MDLM mode */
	USB_DEVICE_AND_INTERFACE_INFO(0x04DD, 0x9031, USB_CLASS_COMM,
	USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
	.driver_info = (unsigned long) &bogus_mdlm_info,
	}, {
	.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
	\| USB_DEVICE_ID_MATCH_DEVICE,
	.idVendor = 0x04DD,
	.idProduct = 0x9032, /* SL-6000 */
	ZAURUS_MASTER_INTERFACE,
	.driver_info = ZAURUS_PXA_INFO,
	}, {
	.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
	\| USB_DEVICE_ID_MATCH_DEVICE,
	.idVendor = 0x04DD,
	/* reported with some C860 units */
	.idProduct = 0x9050, /* C-860 */
	ZAURUS_MASTER_INTERFACE,
	.driver_info = ZAURUS_PXA_INFO,
	},
	{
	/* Motorola Rokr E6 */
	USB_DEVICE_AND_INTERFACE_INFO(0x22b8, 0x6027, USB_CLASS_COMM,
	USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
	.driver_info = (unsigned long) &bogus_mdlm_info,
	}, {
	/* Motorola MOTOMAGX phones */
	USB_DEVICE_AND_INTERFACE_INFO(0x22b8, 0x6425, USB_CLASS_COMM,
	USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
	.driver_info = (unsigned long) &bogus_mdlm_info,
	},

	/* Olympus has some models with a Zaurus-compatible option.
	* R-1000 uses a FreeScale i.MXL cpu (ARMv4T)
	*/
	{
	.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
	\| USB_DEVICE_ID_MATCH_DEVICE,
	.idVendor = 0x07B4,
	.idProduct = 0x0F02, /* R-1000 */
	ZAURUS_MASTER_INTERFACE,
	.driver_info = OLYMPUS_MXL_INFO,
	},

	/* Logitech Harmony 900 - uses the pseudo-MDLM (BLAN) driver */
	{
	USB_DEVICE_AND_INTERFACE_INFO(0x046d, 0xc11f, USB_CLASS_COMM,
	USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
	.driver_info = (unsigned long) &bogus_mdlm_info,
	},
	{ }, // END
	};
	MODULE_DEVICE_TABLE(usb, products);

	static struct usb_driver zaurus_driver = {
	.name = "zaurus",
	.id_table = products,
	.probe = usbnet_probe,
	.disconnect = usbnet_disconnect,
	.suspend = usbnet_suspend,
	.resume = usbnet_resume,
	.disable_hub_initiated_lpm = 1,
	};

	module_usb_driver(zaurus_driver);

	MODULE_AUTHOR("Pavel Machek, David Brownell");
	MODULE_DESCRIPTION("Sharp Zaurus PDA, and compatible products");
	MODULE_LICENSE("GPL");