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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154// SPDX-License-Identifier: GPL-2.0-or-later/* * PL-2301/2302 USB host-to-host link cables * Copyright (C) 2000-2005 by David Brownell */
// #define DEBUG // error path messages, extra info// #define VERBOSE // more; success messages
#include <linux/module.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.prolific.com.tw/ * * 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 developers) 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. * * 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. */
/* * 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 intpl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index){ return usbnet_write_cmd(dev, req, USB_TYPE_VENDOR | USB_RECIP_DEVICE, val, index, NULL, 0);}
static inline intpl_set_QuickLink_features(struct usbnet *dev, int val){ return pl_vendor_req(dev, 3, (u8) val, 0);}
static int pl_reset(struct usbnet *dev){ int status;
/* some units seem to need this reset, others reject it utterly. * FIXME be more like "naplink" or windows drivers. */ status = pl_set_QuickLink_features(dev, PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E); if (status != 0 && netif_msg_probe(dev)) netif_dbg(dev, link, dev->net, "pl_reset --> %d\n", status); return 0;}
static const struct driver_info prolific_info = { .description = "Prolific PL-2301/PL-2302/PL-25A1/PL-27A1", .flags = FLAG_POINTTOPOINT | 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 [] = {
/* full speed cables */{ USB_DEVICE(0x067b, 0x0000), // PL-2301 .driver_info = (unsigned long) &prolific_info,}, { USB_DEVICE(0x067b, 0x0001), // PL-2302 .driver_info = (unsigned long) &prolific_info,},
/* 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,}, { USB_DEVICE(0x3923, 0x7825), /* National Instruments USB * Host-to-Host Cable */ .driver_info = (unsigned long) &prolific_info,
},
/* super speed cables */{ USB_DEVICE(0x067b, 0x27a1), /* PL-27A1, no eeprom * also: goobay Active USB 3.0 * Data Link, * Unitek Y-3501 */ .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, .disable_hub_initiated_lpm = 1,};
module_usb_driver(plusb_driver);
MODULE_AUTHOR("David Brownell");MODULE_DESCRIPTION("Prolific PL-2301/2302/25A1/27A1 USB Host to Host Link Driver");MODULE_LICENSE("GPL");