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.prolifictech.com
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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_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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