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.prolific.com.tw/ 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 * NOTE: pl2501 has several modes, including pl2301 and pl2302 50 * compatibility. Some docs suggest the difference between 2301 51 * and 2302 is only to make MS-Windows use a different driver... 52 * 53 * pl25a1 glue based on patch from Tony Gibbs. Prolific "docs" on 54 * this chip are as usual incomplete about what control messages 55 * are supported. 56 */ 57 58/* 59 * Bits 0-4 can be used for software handshaking; they're set from 60 * one end, cleared from the other, "read" with the interrupt byte. 61 */ 62#define PL_S_EN (1<<7) /* (feature only) suspend enable */ 63/* reserved bit -- rx ready (6) ? */ 64#define PL_TX_READY (1<<5) /* (interrupt only) transmit ready */ 65#define PL_RESET_OUT (1<<4) /* reset output pipe */ 66#define PL_RESET_IN (1<<3) /* reset input pipe */ 67#define PL_TX_C (1<<2) /* transmission complete */ 68#define PL_TX_REQ (1<<1) /* transmission received */ 69#define PL_PEER_E (1<<0) /* peer exists */ 70 71static inline int 72pl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index) 73{ 74 return usbnet_read_cmd(dev, req, 75 USB_DIR_IN | USB_TYPE_VENDOR | 76 USB_RECIP_DEVICE, 77 val, index, NULL, 0); 78} 79 80static inline int 81pl_clear_QuickLink_features(struct usbnet *dev, int val) 82{ 83 return pl_vendor_req(dev, 1, (u8) val, 0); 84} 85 86static inline int 87pl_set_QuickLink_features(struct usbnet *dev, int val) 88{ 89 return pl_vendor_req(dev, 3, (u8) val, 0); 90} 91 92static int pl_reset(struct usbnet *dev) 93{ 94 int status; 95 96 /* some units seem to need this reset, others reject it utterly. 97 * FIXME be more like "naplink" or windows drivers. 98 */ 99 status = pl_set_QuickLink_features(dev, 100 PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E); 101 if (status != 0 && netif_msg_probe(dev)) 102 netif_dbg(dev, link, dev->net, "pl_reset --> %d\n", status); 103 return 0; 104} 105 106static const struct driver_info prolific_info = { 107 .description = "Prolific PL-2301/PL-2302/PL-25A1", 108 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT, 109 /* some PL-2302 versions seem to fail usb_set_interface() */ 110 .reset = pl_reset, 111}; 112 113 114/*-------------------------------------------------------------------------*/ 115 116/* 117 * Proilific's name won't normally be on the cables, and 118 * may not be on the device. 119 */ 120 121static const struct usb_device_id products [] = { 122 123/* full speed cables */ 124{ 125 USB_DEVICE(0x067b, 0x0000), // PL-2301 126 .driver_info = (unsigned long) &prolific_info, 127}, { 128 USB_DEVICE(0x067b, 0x0001), // PL-2302 129 .driver_info = (unsigned long) &prolific_info, 130}, 131 132/* high speed cables */ 133{ 134 USB_DEVICE(0x067b, 0x25a1), /* PL-25A1, no eeprom */ 135 .driver_info = (unsigned long) &prolific_info, 136}, { 137 USB_DEVICE(0x050d, 0x258a), /* Belkin F5U258/F5U279 (PL-25A1) */ 138 .driver_info = (unsigned long) &prolific_info, 139}, 140 141 { }, // END 142}; 143MODULE_DEVICE_TABLE(usb, products); 144 145static struct usb_driver plusb_driver = { 146 .name = "plusb", 147 .id_table = products, 148 .probe = usbnet_probe, 149 .disconnect = usbnet_disconnect, 150 .suspend = usbnet_suspend, 151 .resume = usbnet_resume, 152 .disable_hub_initiated_lpm = 1, 153}; 154 155module_usb_driver(plusb_driver); 156 157MODULE_AUTHOR("David Brownell"); 158MODULE_DESCRIPTION("Prolific PL-2301/2302/25A1 USB Host to Host Link Driver"); 159MODULE_LICENSE("GPL"); 160