162 lines
4.6 KiB
C
162 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* PL-2301/2302 USB host-to-host link cables
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* Copyright (C) 2000-2005 by David Brownell
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*/
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// #define DEBUG // error path messages, extra info
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// #define VERBOSE // more; success messages
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/workqueue.h>
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#include <linux/mii.h>
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#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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*
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* The protocol and handshaking used here should be bug-compatible
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* with the Linux 2.2 "plusb" driver, by Deti Fliegl.
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*
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* HEADS UP: this handshaking isn't all that robust. This driver
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* gets confused easily if you unplug one end of the cable then
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* try to connect it again; you'll need to restart both ends. The
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* "naplink" software (used by some PlayStation/2 developers) does
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* the handshaking much better! Also, sometimes this hardware
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* seems to get wedged under load. Prolific docs are weak, and
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* don't identify differences between PL2301 and PL2302, much less
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* anything to explain the different PL2302 versions observed.
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*
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* NOTE: pl2501 has several modes, including pl2301 and pl2302
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* compatibility. Some docs suggest the difference between 2301
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* and 2302 is only to make MS-Windows use a different driver...
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*
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* pl25a1 glue based on patch from Tony Gibbs. Prolific "docs" on
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* this chip are as usual incomplete about what control messages
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* are supported.
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*/
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/*
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* Bits 0-4 can be used for software handshaking; they're set from
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* one end, cleared from the other, "read" with the interrupt byte.
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*/
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#define PL_S_EN (1<<7) /* (feature only) suspend enable */
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/* reserved bit -- rx ready (6) ? */
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#define PL_TX_READY (1<<5) /* (interrupt only) transmit ready */
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#define PL_RESET_OUT (1<<4) /* reset output pipe */
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#define PL_RESET_IN (1<<3) /* reset input pipe */
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#define PL_TX_C (1<<2) /* transmission complete */
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#define PL_TX_REQ (1<<1) /* transmission received */
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#define PL_PEER_E (1<<0) /* peer exists */
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static inline int
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pl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index)
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{
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return usbnet_read_cmd(dev, req,
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USB_DIR_IN | USB_TYPE_VENDOR |
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USB_RECIP_DEVICE,
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val, index, NULL, 0);
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}
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static inline int
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pl_clear_QuickLink_features(struct usbnet *dev, int val)
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{
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return pl_vendor_req(dev, 1, (u8) val, 0);
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}
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static inline int
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pl_set_QuickLink_features(struct usbnet *dev, int val)
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{
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return pl_vendor_req(dev, 3, (u8) val, 0);
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}
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static int pl_reset(struct usbnet *dev)
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{
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int status;
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/* some units seem to need this reset, others reject it utterly.
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* FIXME be more like "naplink" or windows drivers.
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*/
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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))
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netif_dbg(dev, link, dev->net, "pl_reset --> %d\n", status);
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return 0;
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}
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static const struct driver_info prolific_info = {
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.description = "Prolific PL-2301/PL-2302/PL-25A1/PL-27A1",
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.flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT,
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/* some PL-2302 versions seem to fail usb_set_interface() */
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.reset = pl_reset,
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};
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/*-------------------------------------------------------------------------*/
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/*
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* Proilific's name won't normally be on the cables, and
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* may not be on the device.
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*/
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static const struct usb_device_id products [] = {
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/* full speed cables */
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{
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USB_DEVICE(0x067b, 0x0000), // PL-2301
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.driver_info = (unsigned long) &prolific_info,
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}, {
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USB_DEVICE(0x067b, 0x0001), // PL-2302
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.driver_info = (unsigned long) &prolific_info,
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},
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/* high speed cables */
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{
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USB_DEVICE(0x067b, 0x25a1), /* PL-25A1, no eeprom */
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.driver_info = (unsigned long) &prolific_info,
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}, {
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USB_DEVICE(0x050d, 0x258a), /* Belkin F5U258/F5U279 (PL-25A1) */
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.driver_info = (unsigned long) &prolific_info,
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}, {
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USB_DEVICE(0x3923, 0x7825), /* National Instruments USB
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* Host-to-Host Cable
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*/
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.driver_info = (unsigned long) &prolific_info,
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},
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/* super speed cables */
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{
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USB_DEVICE(0x067b, 0x27a1), /* PL-27A1, no eeprom
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* also: goobay Active USB 3.0
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* Data Link,
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* Unitek Y-3501
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*/
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.driver_info = (unsigned long) &prolific_info,
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},
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{ }, // END
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};
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MODULE_DEVICE_TABLE(usb, products);
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static struct usb_driver plusb_driver = {
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.name = "plusb",
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.id_table = products,
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.probe = usbnet_probe,
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.disconnect = usbnet_disconnect,
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.suspend = usbnet_suspend,
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.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-2301/2302/25A1/27A1 USB Host to Host Link Driver");
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MODULE_LICENSE("GPL");
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