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c261344d3c
The documentation for the USB ethernet devices suggests that only some devices are supposed to use usb0 as the network interface name instead of eth0. The logic used there, and documented in Kconfig for CDC is that eth0 will be used when the mac address is a globally assigned one, but usb0 is used for the locally managed range that is typically used on point-to-point links. Unfortunately, this has caused a lot of pain on the smsc95xx device that is used on the popular pandaboard without an EEPROM to store the MAC address, which causes the driver to call random_ether_address(). Obviously, there should be a proper MAC addressed assigned to the device, and discussions are ongoing about how to solve this, but this patch at least makes sure that the default interface naming gets a little saner and matches what the user can expect based on the documentation, including for new devices. The approach taken here is to flag whether a device might be a point-to-point link with the new FLAG_POINTTOPOINT setting in the usbnet driver_info. A driver can set both FLAG_POINTTOPOINT and FLAG_ETHER if it is not sure (e.g. cdc_ether), or just one of the two. The usbnet framework only looks at the MAC address for device naming if both flags are set, otherwise it trusts the flag. Signed-off-by: Arnd Bergmann <arnd.bergmann@linaro.org> Tested-by: Andy Green <andy.green@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
150 lines
4.3 KiB
C
150 lines
4.3 KiB
C
/*
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* PL-2301/2302 USB host-to-host link cables
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* Copyright (C) 2000-2005 by David Brownell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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// #define DEBUG // error path messages, extra info
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// #define VERBOSE // more; success messages
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/workqueue.h>
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#include <linux/mii.h>
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#include <linux/usb.h>
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#include <linux/usb/usbnet.h>
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/*
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* Prolific PL-2301/PL-2302 driver ... http://www.prolific.com.tw/
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*
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* The protocol and handshaking used here should be bug-compatible
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* with the Linux 2.2 "plusb" driver, by Deti Fliegl.
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*
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* HEADS UP: this handshaking isn't all that robust. This driver
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* gets confused easily if you unplug one end of the cable then
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* try to connect it again; you'll need to restart both ends. The
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* "naplink" software (used by some PlayStation/2 deveopers) does
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* the handshaking much better! Also, sometimes this hardware
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* seems to get wedged under load. Prolific docs are weak, and
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* don't identify differences between PL2301 and PL2302, much less
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* anything to explain the different PL2302 versions observed.
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*/
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/*
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* Bits 0-4 can be used for software handshaking; they're set from
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* one end, cleared from the other, "read" with the interrupt byte.
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*/
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#define PL_S_EN (1<<7) /* (feature only) suspend enable */
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/* reserved bit -- rx ready (6) ? */
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#define PL_TX_READY (1<<5) /* (interrupt only) transmit ready */
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#define PL_RESET_OUT (1<<4) /* reset output pipe */
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#define PL_RESET_IN (1<<3) /* reset input pipe */
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#define PL_TX_C (1<<2) /* transmission complete */
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#define PL_TX_REQ (1<<1) /* transmission received */
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#define PL_PEER_E (1<<0) /* peer exists */
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static inline int
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pl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index)
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{
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return usb_control_msg(dev->udev,
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usb_rcvctrlpipe(dev->udev, 0),
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req,
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USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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val, index,
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NULL, 0,
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USB_CTRL_GET_TIMEOUT);
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}
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static inline int
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pl_clear_QuickLink_features(struct usbnet *dev, int val)
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{
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return pl_vendor_req(dev, 1, (u8) val, 0);
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}
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static inline int
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pl_set_QuickLink_features(struct usbnet *dev, int val)
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{
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return pl_vendor_req(dev, 3, (u8) val, 0);
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}
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static int pl_reset(struct usbnet *dev)
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{
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/* some units seem to need this reset, others reject it utterly.
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* FIXME be more like "naplink" or windows drivers.
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*/
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(void) pl_set_QuickLink_features(dev,
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PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E);
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return 0;
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}
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static const struct driver_info prolific_info = {
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.description = "Prolific PL-2301/PL-2302",
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.flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT,
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/* some PL-2302 versions seem to fail usb_set_interface() */
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.reset = pl_reset,
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};
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/*-------------------------------------------------------------------------*/
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/*
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* Proilific's name won't normally be on the cables, and
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* may not be on the device.
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*/
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static const struct usb_device_id products [] = {
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{
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USB_DEVICE(0x067b, 0x0000), // PL-2301
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.driver_info = (unsigned long) &prolific_info,
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}, {
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USB_DEVICE(0x067b, 0x0001), // PL-2302
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.driver_info = (unsigned long) &prolific_info,
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},
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{ }, // END
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};
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MODULE_DEVICE_TABLE(usb, products);
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static struct usb_driver plusb_driver = {
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.name = "plusb",
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.id_table = products,
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.probe = usbnet_probe,
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.disconnect = usbnet_disconnect,
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.suspend = usbnet_suspend,
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.resume = usbnet_resume,
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};
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static int __init plusb_init(void)
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{
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return usb_register(&plusb_driver);
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}
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module_init(plusb_init);
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static void __exit plusb_exit(void)
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{
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usb_deregister(&plusb_driver);
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}
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module_exit(plusb_exit);
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MODULE_AUTHOR("David Brownell");
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MODULE_DESCRIPTION("Prolific PL-2301/2302 USB Host to Host Link Driver");
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MODULE_LICENSE("GPL");
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