510 lines
14 KiB
C
510 lines
14 KiB
C
/*
|
||
* CDC Ethernet based networking peripherals
|
||
* Copyright (C) 2003-2005 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, write to the Free Software
|
||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||
*/
|
||
|
||
// #define DEBUG // error path messages, extra info
|
||
// #define VERBOSE // more; success messages
|
||
|
||
#include <linux/config.h>
|
||
#ifdef CONFIG_USB_DEBUG
|
||
# define DEBUG
|
||
#endif
|
||
#include <linux/module.h>
|
||
#include <linux/sched.h>
|
||
#include <linux/init.h>
|
||
#include <linux/netdevice.h>
|
||
#include <linux/etherdevice.h>
|
||
#include <linux/ctype.h>
|
||
#include <linux/ethtool.h>
|
||
#include <linux/workqueue.h>
|
||
#include <linux/mii.h>
|
||
#include <linux/usb.h>
|
||
#include <linux/usb_cdc.h>
|
||
|
||
#include "usbnet.h"
|
||
|
||
|
||
/*
|
||
* 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, and knowing
|
||
* that rndis uses one different rule.
|
||
*/
|
||
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;
|
||
struct usb_driver *driver = driver_of(intf);
|
||
|
||
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(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(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(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;
|
||
struct usb_driver *driver = driver_of(intf);
|
||
|
||
/* 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(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(driver, info->control);
|
||
info->control = NULL;
|
||
}
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_cdc_unbind);
|
||
|
||
|
||
/*-------------------------------------------------------------------------
|
||
*
|
||
* Communications Device Class, Ethernet Control model
|
||
*
|
||
* Takes two interfaces. The DATA interface is inactive till an altsetting
|
||
* is selected. Configuration data includes class descriptors. There's
|
||
* an optional status endpoint on the control interface.
|
||
*
|
||
* This should interop with whatever the 2.4 "CDCEther.c" driver
|
||
* (by Brad Hards) talked with, with more functionality.
|
||
*
|
||
*-------------------------------------------------------------------------*/
|
||
|
||
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;
|
||
/* USB_CDC_NOTIFY_RESPONSE_AVAILABLE can happen too (e.g. RNDIS),
|
||
* but there are no standard formats for the response data.
|
||
*/
|
||
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(driver_of(intf), info->data);
|
||
return status;
|
||
}
|
||
|
||
/* FIXME cdc-ether has some multicast code too, though it complains
|
||
* in routine cases. info->ether describes the multicast support.
|
||
* Implement that here, manipulating the cdc filter as needed.
|
||
*/
|
||
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,
|
||
};
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
|
||
static const struct usb_device_id products [] = {
|
||
/*
|
||
* BLACKLIST !!
|
||
*
|
||
* First blacklist any products that are egregiously nonconformant
|
||
* with the CDC Ethernet specs. Minor braindamage we cope with; when
|
||
* they're not even trying, needing a separate driver is only the first
|
||
* of the differences to show up.
|
||
*/
|
||
|
||
#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;
|
||
* wire-incompatible with true CDC Ethernet implementations.
|
||
* (And, it seems, needlessly so...)
|
||
*/
|
||
{
|
||
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
|
||
| USB_DEVICE_ID_MATCH_DEVICE,
|
||
.idVendor = 0x04DD,
|
||
.idProduct = 0x8004,
|
||
ZAURUS_MASTER_INTERFACE,
|
||
.driver_info = 0,
|
||
},
|
||
|
||
/* PXA-25x based Sharp Zaurii. Note that it seems some of these
|
||
* (later models especially) may have shipped only with firmware
|
||
* advertising false "CDC MDLM" compatibility ... but we're not
|
||
* clear which models did that, so for now let's assume the worst.
|
||
*/
|
||
{
|
||
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
|
||
| USB_DEVICE_ID_MATCH_DEVICE,
|
||
.idVendor = 0x04DD,
|
||
.idProduct = 0x8005, /* A-300 */
|
||
ZAURUS_MASTER_INTERFACE,
|
||
.driver_info = 0,
|
||
}, {
|
||
.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 = 0,
|
||
}, {
|
||
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
|
||
| USB_DEVICE_ID_MATCH_DEVICE,
|
||
.idVendor = 0x04DD,
|
||
.idProduct = 0x8007, /* C-700 */
|
||
ZAURUS_MASTER_INTERFACE,
|
||
.driver_info = 0,
|
||
}, {
|
||
.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 = 0,
|
||
}, {
|
||
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
|
||
| USB_DEVICE_ID_MATCH_DEVICE,
|
||
.idVendor = 0x04DD,
|
||
.idProduct = 0x9032, /* SL-6000 */
|
||
ZAURUS_MASTER_INTERFACE,
|
||
.driver_info = 0,
|
||
}, {
|
||
.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 = 0,
|
||
},
|
||
|
||
/*
|
||
* WHITELIST!!!
|
||
*
|
||
* 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 blacklisting devices
|
||
* because of 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,
|
||
},
|
||
{ }, // END
|
||
};
|
||
MODULE_DEVICE_TABLE(usb, products);
|
||
|
||
static struct usb_driver cdc_driver = {
|
||
.owner = THIS_MODULE,
|
||
.name = "cdc_ether",
|
||
.id_table = products,
|
||
.probe = usbnet_probe,
|
||
.disconnect = usbnet_disconnect,
|
||
.suspend = usbnet_suspend,
|
||
.resume = usbnet_resume,
|
||
};
|
||
|
||
|
||
static int __init cdc_init(void)
|
||
{
|
||
BUG_ON((sizeof(((struct usbnet *)0)->data)
|
||
< sizeof(struct cdc_state)));
|
||
|
||
return usb_register(&cdc_driver);
|
||
}
|
||
module_init(cdc_init);
|
||
|
||
static void __exit cdc_exit(void)
|
||
{
|
||
usb_deregister(&cdc_driver);
|
||
}
|
||
module_exit(cdc_exit);
|
||
|
||
MODULE_AUTHOR("David Brownell");
|
||
MODULE_DESCRIPTION("USB CDC Ethernet devices");
|
||
MODULE_LICENSE("GPL");
|