[PATCH] USB: usbnet (7/9) module for CDC Ethernet

Makes the CDC Ethernet support live in a separate driver module.
This module is a bit special since it exports utility functions
that are reused by the the Zaurus and RNDIS drivers, but it's
not "core" like usbnet itself.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 0 insertions, 392 deletions

diff --git a/drivers/usb/net/usbnet.c b/drivers/usb/net/usbnet.c
index 75a05ab0a642..7703725327d2 100644
--- a/drivers/usb/net/usbnet.c
+++ b/drivers/usb/net/usbnet.c
@@ -301,377 +301,6 @@ void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
 EXPORT_SYMBOL_GPL(usbnet_skb_return);
 
 
-/*-------------------------------------------------------------------------
- *
- * Communications Device Class declarations.
- * Used by CDC Ethernet, and some CDC variants
- *
- *-------------------------------------------------------------------------*/
-
-#ifdef	CONFIG_USB_CDCETHER
-#define NEED_GENERIC_CDC
-#endif
-
-#if defined(CONFIG_USB_ZAURUS) || defined(CONFIG_USB_ZAURUS_MODULE)
-/* Ethernet variant uses funky framing, broken ethernet addressing */
-#define NEED_GENERIC_CDC
-#endif
-
-#ifdef	CONFIG_USB_RNDIS
-/* ACM variant uses even funkier framing, complex control RPC scheme */
-#define NEED_GENERIC_CDC
-#endif
-
-
-#ifdef	NEED_GENERIC_CDC
-
-#include <linux/usb_cdc.h>
-
-static struct usb_driver usbnet_driver;
-
-/*
- * probes control interface, claims data interface, collects the bulk
- * endpoints, activates data interface (if needed), maybe sets MTU.
- * all pure cdc, except for certain firmware workarounds.
- */
-int usbnet_generic_cdc_bind (struct usbnet *dev, struct usb_interface *intf)
-{
-	u8				*buf = intf->cur_altsetting->extra;
-	int				len = intf->cur_altsetting->extralen;
-	struct usb_interface_descriptor	*d;
-	struct cdc_state		*info = (void *) &dev->data;
-	int				status;
-	int				rndis;
-
-	if (sizeof dev->data < sizeof *info)
-		return -EDOM;
-
-	/* expect strict spec conformance for the descriptors, but
-	 * cope with firmware which stores them in the wrong place
-	 */
-	if (len == 0 && dev->udev->actconfig->extralen) {
-		/* Motorola SB4100 (and others: Brad Hards says it's
-		 * from a Broadcom design) put CDC descriptors here
-		 */
-		buf = dev->udev->actconfig->extra;
-		len = dev->udev->actconfig->extralen;
-		if (len)
-			dev_dbg (&intf->dev,
-				"CDC descriptors on config\n");
-	}
-
-	/* this assumes that if there's a non-RNDIS vendor variant
-	 * of cdc-acm, it'll fail RNDIS requests cleanly.
-	 */
-	rndis = (intf->cur_altsetting->desc.bInterfaceProtocol == 0xff);
-
-	memset (info, 0, sizeof *info);
-	info->control = intf;
-	while (len > 3) {
-		if (buf [1] != USB_DT_CS_INTERFACE)
-			goto next_desc;
-
-		/* use bDescriptorSubType to identify the CDC descriptors.
-		 * We expect devices with CDC header and union descriptors.
-		 * For CDC Ethernet we need the ethernet descriptor.
-		 * For RNDIS, ignore two (pointless) CDC modem descriptors
-		 * in favor of a complicated OID-based RPC scheme doing what
-		 * CDC Ethernet achieves with a simple descriptor.
-		 */
-		switch (buf [2]) {
-		case USB_CDC_HEADER_TYPE:
-			if (info->header) {
-				dev_dbg (&intf->dev, "extra CDC header\n");
-				goto bad_desc;
-			}
-			info->header = (void *) buf;
-			if (info->header->bLength != sizeof *info->header) {
-				dev_dbg (&intf->dev, "CDC header len %u\n",
-					info->header->bLength);
-				goto bad_desc;
-			}
-			break;
-		case USB_CDC_UNION_TYPE:
-			if (info->u) {
-				dev_dbg (&intf->dev, "extra CDC union\n");
-				goto bad_desc;
-			}
-			info->u = (void *) buf;
-			if (info->u->bLength != sizeof *info->u) {
-				dev_dbg (&intf->dev, "CDC union len %u\n",
-					info->u->bLength);
-				goto bad_desc;
-			}
-
-			/* we need a master/control interface (what we're
-			 * probed with) and a slave/data interface; union
-			 * descriptors sort this all out.
-			 */
-			info->control = usb_ifnum_to_if(dev->udev,
-						info->u->bMasterInterface0);
-			info->data = usb_ifnum_to_if(dev->udev,
-						info->u->bSlaveInterface0);
-			if (!info->control || !info->data) {
-				dev_dbg (&intf->dev,
-					"master #%u/%p slave #%u/%p\n",
-					info->u->bMasterInterface0,
-					info->control,
-					info->u->bSlaveInterface0,
-					info->data);
-				goto bad_desc;
-			}
-			if (info->control != intf) {
-				dev_dbg (&intf->dev, "bogus CDC Union\n");
-				/* Ambit USB Cable Modem (and maybe others)
-				 * interchanges master and slave interface.
-				 */
-				if (info->data == intf) {
-					info->data = info->control;
-					info->control = intf;
-				} else
-					goto bad_desc;
-			}
-
-			/* a data interface altsetting does the real i/o */
-			d = &info->data->cur_altsetting->desc;
-			if (d->bInterfaceClass != USB_CLASS_CDC_DATA) {
-				dev_dbg (&intf->dev, "slave class %u\n",
-					d->bInterfaceClass);
-				goto bad_desc;
-			}
-			break;
-		case USB_CDC_ETHERNET_TYPE:
-			if (info->ether) {
-				dev_dbg (&intf->dev, "extra CDC ether\n");
-				goto bad_desc;
-			}
-			info->ether = (void *) buf;
-			if (info->ether->bLength != sizeof *info->ether) {
-				dev_dbg (&intf->dev, "CDC ether len %u\n",
-					info->ether->bLength);
-				goto bad_desc;
-			}
-			dev->hard_mtu = le16_to_cpu(
-						info->ether->wMaxSegmentSize);
-			/* because of Zaurus, we may be ignoring the host
-			 * side link address we were given.
-			 */
-			break;
-		}
-next_desc:
-		len -= buf [0];	/* bLength */
-		buf += buf [0];
-	}
-
-	if (!info->header || !info->u || (!rndis && !info->ether)) {
-		dev_dbg (&intf->dev, "missing cdc %s%s%sdescriptor\n",
-			info->header ? "" : "header ",
-			info->u ? "" : "union ",
-			info->ether ? "" : "ether ");
-		goto bad_desc;
-	}
-
-	/* claim data interface and set it up ... with side effects.
-	 * network traffic can't flow until an altsetting is enabled.
-	 */
-	status = usb_driver_claim_interface (&usbnet_driver, info->data, dev);
-	if (status < 0)
-		return status;
-	status = usbnet_get_endpoints (dev, info->data);
-	if (status < 0) {
-		/* ensure immediate exit from usbnet_disconnect */
-		usb_set_intfdata(info->data, NULL);
-		usb_driver_release_interface (&usbnet_driver, info->data);
-		return status;
-	}
-
-	/* status endpoint: optional for CDC Ethernet, not RNDIS (or ACM) */
-	dev->status = NULL;
-	if (info->control->cur_altsetting->desc.bNumEndpoints == 1) {
-		struct usb_endpoint_descriptor	*desc;
-
-		dev->status = &info->control->cur_altsetting->endpoint [0];
-		desc = &dev->status->desc;
-		if (desc->bmAttributes != USB_ENDPOINT_XFER_INT
-				|| !(desc->bEndpointAddress & USB_DIR_IN)
-				|| (le16_to_cpu(desc->wMaxPacketSize)
-					< sizeof (struct usb_cdc_notification))
-				|| !desc->bInterval) {
-			dev_dbg (&intf->dev, "bad notification endpoint\n");
-			dev->status = NULL;
-		}
-	}
-	if (rndis && !dev->status) {
-		dev_dbg (&intf->dev, "missing RNDIS status endpoint\n");
-		usb_set_intfdata(info->data, NULL);
-		usb_driver_release_interface (&usbnet_driver, info->data);
-		return -ENODEV;
-	}
-	return 0;
-
-bad_desc:
-	dev_info (&dev->udev->dev, "bad CDC descriptors\n");
-	return -ENODEV;
-}
-EXPORT_SYMBOL_GPL(usbnet_generic_cdc_bind);
-
-void usbnet_cdc_unbind (struct usbnet *dev, struct usb_interface *intf)
-{
-	struct cdc_state		*info = (void *) &dev->data;
-
-	/* disconnect master --> disconnect slave */
-	if (intf == info->control && info->data) {
-		/* ensure immediate exit from usbnet_disconnect */
-		usb_set_intfdata(info->data, NULL);
-		usb_driver_release_interface (&usbnet_driver, info->data);
-		info->data = NULL;
-	}
-
-	/* and vice versa (just in case) */
-	else if (intf == info->data && info->control) {
-		/* ensure immediate exit from usbnet_disconnect */
-		usb_set_intfdata(info->control, NULL);
-		usb_driver_release_interface (&usbnet_driver, info->control);
-		info->control = NULL;
-	}
-}
-EXPORT_SYMBOL_GPL(usbnet_cdc_unbind);
-
-#endif	/* NEED_GENERIC_CDC */
-
-
-#ifdef	CONFIG_USB_CDCETHER
-#define	HAVE_HARDWARE
-
-/*-------------------------------------------------------------------------
- *
- * Communications Device Class, Ethernet Control model
- *
- * Takes two interfaces.  The DATA interface is inactive till an altsetting
- * is selected.  Configuration data includes class descriptors.
- *
- * This should interop with whatever the 2.4 "CDCEther.c" driver
- * (by Brad Hards) talked with.
- *
- *-------------------------------------------------------------------------*/
-
-#include <linux/ctype.h>
-
-
-static void dumpspeed (struct usbnet *dev, __le32 *speeds)
-{
-	if (netif_msg_timer (dev))
-		devinfo (dev, "link speeds: %u kbps up, %u kbps down",
-			__le32_to_cpu(speeds[0]) / 1000,
-		__le32_to_cpu(speeds[1]) / 1000);
-}
-
-static void cdc_status (struct usbnet *dev, struct urb *urb)
-{
-	struct usb_cdc_notification	*event;
-
-	if (urb->actual_length < sizeof *event)
-		return;
-	
-	/* SPEED_CHANGE can get split into two 8-byte packets */
-	if (test_and_clear_bit (EVENT_STS_SPLIT, &dev->flags)) {
-		dumpspeed (dev, (__le32 *) urb->transfer_buffer);
-		return;
-	}
-
-	event = urb->transfer_buffer;
-	switch (event->bNotificationType) {
-	case USB_CDC_NOTIFY_NETWORK_CONNECTION:
-		if (netif_msg_timer (dev))
-			devdbg (dev, "CDC: carrier %s",
-					event->wValue ? "on" : "off");
-		if (event->wValue)
-			netif_carrier_on(dev->net);
-		else
-			netif_carrier_off(dev->net);
-		break;
-	case USB_CDC_NOTIFY_SPEED_CHANGE:	/* tx/rx rates */
-		if (netif_msg_timer (dev))
-			devdbg (dev, "CDC: speed change (len %d)",
-					urb->actual_length);
-		if (urb->actual_length != (sizeof *event + 8))
-			set_bit (EVENT_STS_SPLIT, &dev->flags);
-		else
-			dumpspeed (dev, (__le32 *) &event[1]);
-		break;
-	// case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:	/* RNDIS; or unsolicited */
-	default:
-		deverr (dev, "CDC: unexpected notification %02x!",
-				 event->bNotificationType);
-		break;
-	}
-}
-
-static u8 nibble (unsigned char c)
-{
-	if (likely (isdigit (c)))
-		return c - '0';
-	c = toupper (c);
-	if (likely (isxdigit (c)))
-		return 10 + c - 'A';
-	return 0;
-}
-
-static inline int
-get_ethernet_addr (struct usbnet *dev, struct usb_cdc_ether_desc *e)
-{
-	int 		tmp, i;
-	unsigned char	buf [13];
-
-	tmp = usb_string (dev->udev, e->iMACAddress, buf, sizeof buf);
-	if (tmp != 12) {
-		dev_dbg (&dev->udev->dev,
-			"bad MAC string %d fetch, %d\n", e->iMACAddress, tmp);
-		if (tmp >= 0)
-			tmp = -EINVAL;
-		return tmp;
-	}
-	for (i = tmp = 0; i < 6; i++, tmp += 2)
-		dev->net->dev_addr [i] =
-			 (nibble (buf [tmp]) << 4) + nibble (buf [tmp + 1]);
-	return 0;
-}
-
-static int cdc_bind (struct usbnet *dev, struct usb_interface *intf)
-{
-	int				status;
-	struct cdc_state		*info = (void *) &dev->data;
-
-	status = usbnet_generic_cdc_bind (dev, intf);
-	if (status < 0)
-		return status;
-
-	status = get_ethernet_addr (dev, info->ether);
-	if (status < 0) {
-		usb_set_intfdata(info->data, NULL);
-		usb_driver_release_interface (&usbnet_driver, info->data);
-		return status;
-	}
-
-	/* FIXME cdc-ether has some multicast code too, though it complains
-	 * in routine cases.  info->ether describes the multicast support.
-	 */
-	return 0;
-}
-
-static const struct driver_info	cdc_info = {
-	.description =	"CDC Ethernet Device",
-	.flags =	FLAG_ETHER,
-	// .check_connect = cdc_check_connect,
-	.bind =		cdc_bind,
-	.unbind =	usbnet_cdc_unbind,
-	.status =	cdc_status,
-};
-
-#endif	/* CONFIG_USB_CDCETHER */
-
-
-
 #ifdef CONFIG_USB_PL2301
 #define	HAVE_HARDWARE
 
@@ -1754,23 +1383,6 @@ static const struct usb_device_id	products [] = {
 	.driver_info = (unsigned long) &rndis_info,
 },
 #endif
-
-#ifdef	CONFIG_USB_CDCETHER
-{
-	/* CDC Ether uses two interfaces, not necessarily consecutive.
-	 * We match the main interface, ignoring the optional device
-	 * class so we could handle devices that aren't exclusively
-	 * CDC ether.
-	 *
-	 * NOTE:  this match must come AFTER entries working around
-	 * bugs/quirks in a given product (like Zaurus, above).
-	 */
-	USB_INTERFACE_INFO (USB_CLASS_COMM, USB_CDC_SUBCLASS_ETHERNET,
-			USB_CDC_PROTO_NONE),
-	.driver_info = (unsigned long) &cdc_info,
-},
-#endif
-
 	{ },		// END
 };
 MODULE_DEVICE_TABLE (usb, products);
@@ -1792,10 +1404,6 @@ static int __init usbnet_init(void)
 	// compiler should optimize these out
 	BUG_ON (sizeof (((struct sk_buff *)0)->cb)
 			< sizeof (struct skb_data));
-#ifdef	CONFIG_USB_CDCETHER
-	BUG_ON ((sizeof (((struct usbnet *)0)->data)
-			< sizeof (struct cdc_state)));
-#endif
 
 	random_ether_addr(node_id);