1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
// 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 int
pl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index)
{
return usbnet_read_cmd(dev, req,
USB_DIR_IN | USB_TYPE_VENDOR |
USB_RECIP_DEVICE,
val, index, NULL, 0);
}
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)
{
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");
|
