/* * PL-2301/2302 USB host-to-host link cables * Copyright (C) 2000-2005 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/module.h> #include <linux/init.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/ethtool.h> #include <linux/workqueue.h> #include <linux/mii.h> #include <linux/usb.h> #include <linux/usb/usbnet.h> /* * Prolific PL-2301/PL-2302 driver ... http://www.prolifictech.com * * The protocol and handshaking used here should be bug-compatible * with the Linux 2.2 "plusb" driver, by Deti Fliegl. * * HEADS UP: this handshaking isn't all that robust. This driver * gets confused easily if you unplug one end of the cable then * try to connect it again; you'll need to restart both ends. The * "naplink" software (used by some PlayStation/2 deveopers) does * the handshaking much better! Also, sometimes this hardware * seems to get wedged under load. Prolific docs are weak, and * don't identify differences between PL2301 and PL2302, much less * anything to explain the different PL2302 versions observed. */ /* * Bits 0-4 can be used for software handshaking; they're set from * one end, cleared from the other, "read" with the interrupt byte. */ #define PL_S_EN (1<<7) /* (feature only) suspend enable */ /* reserved bit -- rx ready (6) ? */ #define PL_TX_READY (1<<5) /* (interrupt only) transmit ready */ #define PL_RESET_OUT (1<<4) /* reset output pipe */ #define PL_RESET_IN (1<<3) /* reset input pipe */ #define PL_TX_C (1<<2) /* transmission complete */ #define PL_TX_REQ (1<<1) /* transmission received */ #define PL_PEER_E (1<<0) /* peer exists */ static inline int pl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index) { return usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, val, index, NULL, 0, USB_CTRL_GET_TIMEOUT); } static inline int pl_clear_QuickLink_features(struct usbnet *dev, int val) { return pl_vendor_req(dev, 1, (u8) val, 0); } static inline int pl_set_QuickLink_features(struct usbnet *dev, int val) { return pl_vendor_req(dev, 3, (u8) val, 0); } static int pl_reset(struct usbnet *dev) { /* some units seem to need this reset, others reject it utterly. * FIXME be more like "naplink" or windows drivers. */ (void) pl_set_QuickLink_features(dev, PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E); return 0; } static const struct driver_info prolific_info = { .description = "Prolific PL-2301/PL-2302", .flags = FLAG_NO_SETINT, /* some PL-2302 versions seem to fail usb_set_interface() */ .reset = pl_reset, }; /*-------------------------------------------------------------------------*/ /* * Proilific's name won't normally be on the cables, and * may not be on the device. */ static const struct usb_device_id products [] = { { USB_DEVICE(0x067b, 0x0000), // PL-2301 .driver_info = (unsigned long) &prolific_info, }, { USB_DEVICE(0x067b, 0x0001), // PL-2302 .driver_info = (unsigned long) &prolific_info, }, { }, // END }; MODULE_DEVICE_TABLE(usb, products); static struct usb_driver plusb_driver = { .name = "plusb", .id_table = products, .probe = usbnet_probe, .disconnect = usbnet_disconnect, .suspend = usbnet_suspend, .resume = usbnet_resume, }; static int __init plusb_init(void) { return usb_register(&plusb_driver); } module_init(plusb_init); static void __exit plusb_exit(void) { usb_deregister(&plusb_driver); } module_exit(plusb_exit); MODULE_AUTHOR("David Brownell"); MODULE_DESCRIPTION("Prolific PL-2301/2302 USB Host to Host Link Driver"); MODULE_LICENSE("GPL");