1/* 2 * PL-2301/2302 USB host-to-host link cables 3 * Copyright (C) 2000-2005 by David Brownell 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20// #define DEBUG // error path messages, extra info 21// #define VERBOSE // more; success messages 22 23#include <linux/module.h> 24#include <linux/init.h> 25#include <linux/netdevice.h> 26#include <linux/etherdevice.h> 27#include <linux/ethtool.h> 28#include <linux/workqueue.h> 29#include <linux/mii.h> 30#include <linux/usb.h> 31#include <linux/usb/usbnet.h> 32 33 34/* 35 * Prolific PL-2301/PL-2302 driver ... http://www.prolifictech.com 36 * 37 * The protocol and handshaking used here should be bug-compatible 38 * with the Linux 2.2 "plusb" driver, by Deti Fliegl. 39 * 40 * HEADS UP: this handshaking isn't all that robust. This driver 41 * gets confused easily if you unplug one end of the cable then 42 * try to connect it again; you'll need to restart both ends. The 43 * "naplink" software (used by some PlayStation/2 deveopers) does 44 * the handshaking much better! Also, sometimes this hardware 45 * seems to get wedged under load. Prolific docs are weak, and 46 * don't identify differences between PL2301 and PL2302, much less 47 * anything to explain the different PL2302 versions observed. 48 */ 49 50/* 51 * Bits 0-4 can be used for software handshaking; they're set from 52 * one end, cleared from the other, "read" with the interrupt byte. 53 */ 54#define PL_S_EN (1<<7) /* (feature only) suspend enable */ 55/* reserved bit -- rx ready (6) ? */ 56#define PL_TX_READY (1<<5) /* (interrupt only) transmit ready */ 57#define PL_RESET_OUT (1<<4) /* reset output pipe */ 58#define PL_RESET_IN (1<<3) /* reset input pipe */ 59#define PL_TX_C (1<<2) /* transmission complete */ 60#define PL_TX_REQ (1<<1) /* transmission received */ 61#define PL_PEER_E (1<<0) /* peer exists */ 62 63static inline int 64pl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index) 65{ 66 return usb_control_msg(dev->udev, 67 usb_rcvctrlpipe(dev->udev, 0), 68 req, 69 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 70 val, index, 71 NULL, 0, 72 USB_CTRL_GET_TIMEOUT); 73} 74 75static inline int 76pl_clear_QuickLink_features(struct usbnet *dev, int val) 77{ 78 return pl_vendor_req(dev, 1, (u8) val, 0); 79} 80 81static inline int 82pl_set_QuickLink_features(struct usbnet *dev, int val) 83{ 84 return pl_vendor_req(dev, 3, (u8) val, 0); 85} 86 87static int pl_reset(struct usbnet *dev) 88{ 89 (void) pl_set_QuickLink_features(dev, 90 PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E); 91 return 0; 92} 93 94static const struct driver_info prolific_info = { 95 .description = "Prolific PL-2301/PL-2302", 96 .flags = FLAG_NO_SETINT, 97 /* some PL-2302 versions seem to fail usb_set_interface() */ 98 .reset = pl_reset, 99}; 100 101 102/*-------------------------------------------------------------------------*/ 103 104/* 105 * Proilific's name won't normally be on the cables, and 106 * may not be on the device. 107 */ 108 109static const struct usb_device_id products [] = { 110 111{ 112 USB_DEVICE(0x067b, 0x0000), // PL-2301 113 .driver_info = (unsigned long) &prolific_info, 114}, { 115 USB_DEVICE(0x067b, 0x0001), // PL-2302 116 .driver_info = (unsigned long) &prolific_info, 117}, 118 119 { }, // END 120}; 121MODULE_DEVICE_TABLE(usb, products); 122 123static struct usb_driver plusb_driver = { 124 .name = "plusb", 125 .id_table = products, 126 .probe = usbnet_probe, 127 .disconnect = usbnet_disconnect, 128 .suspend = usbnet_suspend, 129 .resume = usbnet_resume, 130}; 131 132static int __init plusb_init(void) 133{ 134 return usb_register(&plusb_driver); 135} 136module_init(plusb_init); 137 138static void __exit plusb_exit(void) 139{ 140 usb_deregister(&plusb_driver); 141} 142module_exit(plusb_exit); 143 144MODULE_AUTHOR("David Brownell"); 145MODULE_DESCRIPTION("Prolific PL-2301/2302 USB Host to Host Link Driver"); 146MODULE_LICENSE("GPL"); 147