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drivers/net/usb/plusb.c
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/* * 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 |
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* along with this program; if not, see <http://www.gnu.org/licenses/>. |
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*/ // #define DEBUG // error path messages, extra info // #define VERBOSE // more; success messages |
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#include <linux/module.h> |
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#include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/ethtool.h> #include <linux/workqueue.h> #include <linux/mii.h> #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.prolific.com.tw/ |
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* * 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. |
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* * NOTE: pl2501 has several modes, including pl2301 and pl2302 * compatibility. Some docs suggest the difference between 2301 * and 2302 is only to make MS-Windows use a different driver... * * pl25a1 glue based on patch from Tony Gibbs. Prolific "docs" on * this chip are as usual incomplete about what control messages * are supported. |
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*/ /* * 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) { |
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return usbnet_read_cmd(dev, req, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, val, index, NULL, 0); |
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} 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) { |
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int status; |
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/* some units seem to need this reset, others reject it utterly. * FIXME be more like "naplink" or windows drivers. */ |
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status = 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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if (status != 0 && netif_msg_probe(dev)) netif_dbg(dev, link, dev->net, "pl_reset --> %d ", status); |
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return 0; } static const struct driver_info prolific_info = { |
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.description = "Prolific PL-2301/PL-2302/PL-25A1", |
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.flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT, |
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/* 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 [] = { |
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/* full speed cables */ |
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{ USB_DEVICE(0x067b, 0x0000), // PL-2301 .driver_info = (unsigned long) &prolific_info, }, { USB_DEVICE(0x067b, 0x0001), // PL-2302 .driver_info = (unsigned long) &prolific_info, }, |
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/* high speed cables */ { USB_DEVICE(0x067b, 0x25a1), /* PL-25A1, no eeprom */ .driver_info = (unsigned long) &prolific_info, }, { USB_DEVICE(0x050d, 0x258a), /* Belkin F5U258/F5U279 (PL-25A1) */ .driver_info = (unsigned long) &prolific_info, }, |
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{ }, // END }; MODULE_DEVICE_TABLE(usb, products); static struct usb_driver plusb_driver = { |
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.name = "plusb", .id_table = products, .probe = usbnet_probe, .disconnect = usbnet_disconnect, .suspend = usbnet_suspend, .resume = usbnet_resume, |
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.disable_hub_initiated_lpm = 1, |
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}; |
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module_usb_driver(plusb_driver); |
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MODULE_AUTHOR("David Brownell"); |
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MODULE_DESCRIPTION("Prolific PL-2301/2302/25A1 USB Host to Host Link Driver"); |
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MODULE_LICENSE("GPL"); |