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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PL-2301/2302 USB host-to-host link cables
4 * Copyright (C) 2000-2005 by David Brownell
5 */
6
7// #define DEBUG // error path messages, extra info
8// #define VERBOSE // more; success messages
9
10#include <linux/module.h>
11#include <linux/netdevice.h>
12#include <linux/etherdevice.h>
13#include <linux/ethtool.h>
14#include <linux/workqueue.h>
15#include <linux/mii.h>
16#include <linux/usb.h>
17#include <linux/usb/usbnet.h>
18
19
20/*
21 * Prolific PL-2301/PL-2302 driver ... http://www.prolific.com.tw/
22 *
23 * The protocol and handshaking used here should be bug-compatible
24 * with the Linux 2.2 "plusb" driver, by Deti Fliegl.
25 *
26 * HEADS UP: this handshaking isn't all that robust. This driver
27 * gets confused easily if you unplug one end of the cable then
28 * try to connect it again; you'll need to restart both ends. The
29 * "naplink" software (used by some PlayStation/2 developers) does
30 * the handshaking much better! Also, sometimes this hardware
31 * seems to get wedged under load. Prolific docs are weak, and
32 * don't identify differences between PL2301 and PL2302, much less
33 * anything to explain the different PL2302 versions observed.
34 *
35 * NOTE: pl2501 has several modes, including pl2301 and pl2302
36 * compatibility. Some docs suggest the difference between 2301
37 * and 2302 is only to make MS-Windows use a different driver...
38 *
39 * pl25a1 glue based on patch from Tony Gibbs. Prolific "docs" on
40 * this chip are as usual incomplete about what control messages
41 * are supported.
42 */
43
44/*
45 * Bits 0-4 can be used for software handshaking; they're set from
46 * one end, cleared from the other, "read" with the interrupt byte.
47 */
48#define PL_S_EN (1<<7) /* (feature only) suspend enable */
49/* reserved bit -- rx ready (6) ? */
50#define PL_TX_READY (1<<5) /* (interrupt only) transmit ready */
51#define PL_RESET_OUT (1<<4) /* reset output pipe */
52#define PL_RESET_IN (1<<3) /* reset input pipe */
53#define PL_TX_C (1<<2) /* transmission complete */
54#define PL_TX_REQ (1<<1) /* transmission received */
55#define PL_PEER_E (1<<0) /* peer exists */
56
57static inline int
58pl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index)
59{
60 return usbnet_write_cmd(dev, req, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
61 val, index, NULL, 0);
62}
63
64static inline int
65pl_set_QuickLink_features(struct usbnet *dev, int val)
66{
67 return pl_vendor_req(dev, 3, (u8) val, 0);
68}
69
70static int pl_reset(struct usbnet *dev)
71{
72 int status;
73
74 /* some units seem to need this reset, others reject it utterly.
75 * FIXME be more like "naplink" or windows drivers.
76 */
77 status = pl_set_QuickLink_features(dev,
78 PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E);
79 if (status != 0 && netif_msg_probe(dev))
80 netif_dbg(dev, link, dev->net, "pl_reset --> %d\n", status);
81 return 0;
82}
83
84static const struct driver_info prolific_info = {
85 .description = "Prolific PL-2301/PL-2302/PL-25A1/PL-27A1",
86 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT,
87 /* some PL-2302 versions seem to fail usb_set_interface() */
88 .reset = pl_reset,
89};
90
91
92/*-------------------------------------------------------------------------*/
93
94/*
95 * Proilific's name won't normally be on the cables, and
96 * may not be on the device.
97 */
98
99static const struct usb_device_id products [] = {
100
101/* full speed cables */
102{
103 USB_DEVICE(0x067b, 0x0000), // PL-2301
104 .driver_info = (unsigned long) &prolific_info,
105}, {
106 USB_DEVICE(0x067b, 0x0001), // PL-2302
107 .driver_info = (unsigned long) &prolific_info,
108},
109
110/* high speed cables */
111{
112 USB_DEVICE(0x067b, 0x25a1), /* PL-25A1, no eeprom */
113 .driver_info = (unsigned long) &prolific_info,
114}, {
115 USB_DEVICE(0x050d, 0x258a), /* Belkin F5U258/F5U279 (PL-25A1) */
116 .driver_info = (unsigned long) &prolific_info,
117}, {
118 USB_DEVICE(0x3923, 0x7825), /* National Instruments USB
119 * Host-to-Host Cable
120 */
121 .driver_info = (unsigned long) &prolific_info,
122
123},
124
125/* super speed cables */
126{
127 USB_DEVICE(0x067b, 0x27a1), /* PL-27A1, no eeprom
128 * also: goobay Active USB 3.0
129 * Data Link,
130 * Unitek Y-3501
131 */
132 .driver_info = (unsigned long) &prolific_info,
133},
134
135 { }, // END
136};
137MODULE_DEVICE_TABLE(usb, products);
138
139static struct usb_driver plusb_driver = {
140 .name = "plusb",
141 .id_table = products,
142 .probe = usbnet_probe,
143 .disconnect = usbnet_disconnect,
144 .suspend = usbnet_suspend,
145 .resume = usbnet_resume,
146 .disable_hub_initiated_lpm = 1,
147};
148
149module_usb_driver(plusb_driver);
150
151MODULE_AUTHOR("David Brownell");
152MODULE_DESCRIPTION("Prolific PL-2301/2302/25A1/27A1 USB Host to Host Link Driver");
153MODULE_LICENSE("GPL");