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, see <http://www.gnu.org/licenses/>. 17 */ 18 19 // #define DEBUG // error path messages, extra info 20 // #define VERBOSE // more; success messages 21 22 #include <linux/module.h> 23 #include <linux/init.h> 24 #include <linux/netdevice.h> 25 #include <linux/etherdevice.h> 26 #include <linux/ethtool.h> 27 #include <linux/workqueue.h> 28 #include <linux/mii.h> 29 #include <linux/usb.h> 30 #include <linux/usb/usbnet.h> 31 32 33 /* 34 * Prolific PL-2301/PL-2302 driver ... http://www.prolific.com.tw/ 35 * 36 * The protocol and handshaking used here should be bug-compatible 37 * with the Linux 2.2 "plusb" driver, by Deti Fliegl. 38 * 39 * HEADS UP: this handshaking isn't all that robust. This driver 40 * gets confused easily if you unplug one end of the cable then 41 * try to connect it again; you'll need to restart both ends. The 42 * "naplink" software (used by some PlayStation/2 deveopers) does 43 * the handshaking much better! Also, sometimes this hardware 44 * seems to get wedged under load. Prolific docs are weak, and 45 * don't identify differences between PL2301 and PL2302, much less 46 * anything to explain the different PL2302 versions observed. 47 * 48 * NOTE: pl2501 has several modes, including pl2301 and pl2302 49 * compatibility. Some docs suggest the difference between 2301 50 * and 2302 is only to make MS-Windows use a different driver... 51 * 52 * pl25a1 glue based on patch from Tony Gibbs. Prolific "docs" on 53 * this chip are as usual incomplete about what control messages 54 * are supported. 55 */ 56 57 /* 58 * Bits 0-4 can be used for software handshaking; they're set from 59 * one end, cleared from the other, "read" with the interrupt byte. 60 */ 61 #define PL_S_EN (1<<7) /* (feature only) suspend enable */ 62 /* reserved bit -- rx ready (6) ? */ 63 #define PL_TX_READY (1<<5) /* (interrupt only) transmit ready */ 64 #define PL_RESET_OUT (1<<4) /* reset output pipe */ 65 #define PL_RESET_IN (1<<3) /* reset input pipe */ 66 #define PL_TX_C (1<<2) /* transmission complete */ 67 #define PL_TX_REQ (1<<1) /* transmission received */ 68 #define PL_PEER_E (1<<0) /* peer exists */ 69 70 static inline int 71 pl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index) 72 { 73 return usbnet_read_cmd(dev, req, 74 USB_DIR_IN | USB_TYPE_VENDOR | 75 USB_RECIP_DEVICE, 76 val, index, NULL, 0); 77 } 78 79 static inline int 80 pl_clear_QuickLink_features(struct usbnet *dev, int val) 81 { 82 return pl_vendor_req(dev, 1, (u8) val, 0); 83 } 84 85 static inline int 86 pl_set_QuickLink_features(struct usbnet *dev, int val) 87 { 88 return pl_vendor_req(dev, 3, (u8) val, 0); 89 } 90 91 static int pl_reset(struct usbnet *dev) 92 { 93 int status; 94 95 /* some units seem to need this reset, others reject it utterly. 96 * FIXME be more like "naplink" or windows drivers. 97 */ 98 status = pl_set_QuickLink_features(dev, 99 PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E); 100 if (status != 0 && netif_msg_probe(dev)) 101 netif_dbg(dev, link, dev->net, "pl_reset --> %d\n", status); 102 return 0; 103 } 104 105 static const struct driver_info prolific_info = { 106 .description = "Prolific PL-2301/PL-2302/PL-25A1", 107 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT, 108 /* some PL-2302 versions seem to fail usb_set_interface() */ 109 .reset = pl_reset, 110 }; 111 112 113 /*-------------------------------------------------------------------------*/ 114 115 /* 116 * Proilific's name won't normally be on the cables, and 117 * may not be on the device. 118 */ 119 120 static const struct usb_device_id products [] = { 121 122 /* full speed cables */ 123 { 124 USB_DEVICE(0x067b, 0x0000), // PL-2301 125 .driver_info = (unsigned long) &prolific_info, 126 }, { 127 USB_DEVICE(0x067b, 0x0001), // PL-2302 128 .driver_info = (unsigned long) &prolific_info, 129 }, 130 131 /* high speed cables */ 132 { 133 USB_DEVICE(0x067b, 0x25a1), /* PL-25A1, no eeprom */ 134 .driver_info = (unsigned long) &prolific_info, 135 }, { 136 USB_DEVICE(0x050d, 0x258a), /* Belkin F5U258/F5U279 (PL-25A1) */ 137 .driver_info = (unsigned long) &prolific_info, 138 }, 139 140 { }, // END 141 }; 142 MODULE_DEVICE_TABLE(usb, products); 143 144 static struct usb_driver plusb_driver = { 145 .name = "plusb", 146 .id_table = products, 147 .probe = usbnet_probe, 148 .disconnect = usbnet_disconnect, 149 .suspend = usbnet_suspend, 150 .resume = usbnet_resume, 151 .disable_hub_initiated_lpm = 1, 152 }; 153 154 module_usb_driver(plusb_driver); 155 156 MODULE_AUTHOR("David Brownell"); 157 MODULE_DESCRIPTION("Prolific PL-2301/2302/25A1 USB Host to Host Link Driver"); 158 MODULE_LICENSE("GPL"); 159