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David Brownell090ffa92005-08-31 09:54:50 -07001/*
2 * PL-2301/2302 USB host-to-host link cables
3 * Copyright (C) 2000-2005 by David Brownell
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20// #define DEBUG // error path messages, extra info
21// #define VERBOSE // more; success messages
22
David Brownell090ffa92005-08-31 09:54:50 -070023#include <linux/module.h>
David Brownell090ffa92005-08-31 09:54:50 -070024#include <linux/init.h>
25#include <linux/netdevice.h>
26#include <linux/etherdevice.h>
27#include <linux/ethtool.h>
28#include <linux/workqueue.h>
29#include <linux/mii.h>
30#include <linux/usb.h>
Jussi Kivilinna3692e942008-01-26 00:51:45 +020031#include <linux/usb/usbnet.h>
David Brownell090ffa92005-08-31 09:54:50 -070032
33
34/*
35 * Prolific PL-2301/PL-2302 driver ... http://www.prolifictech.com
36 *
37 * The protocol and handshaking used here should be bug-compatible
38 * with the Linux 2.2 "plusb" driver, by Deti Fliegl.
39 *
40 * HEADS UP: this handshaking isn't all that robust. This driver
41 * gets confused easily if you unplug one end of the cable then
42 * try to connect it again; you'll need to restart both ends. The
43 * "naplink" software (used by some PlayStation/2 deveopers) does
44 * the handshaking much better! Also, sometimes this hardware
45 * seems to get wedged under load. Prolific docs are weak, and
46 * don't identify differences between PL2301 and PL2302, much less
47 * anything to explain the different PL2302 versions observed.
48 */
49
50/*
51 * Bits 0-4 can be used for software handshaking; they're set from
52 * one end, cleared from the other, "read" with the interrupt byte.
53 */
54#define PL_S_EN (1<<7) /* (feature only) suspend enable */
55/* reserved bit -- rx ready (6) ? */
56#define PL_TX_READY (1<<5) /* (interrupt only) transmit ready */
57#define PL_RESET_OUT (1<<4) /* reset output pipe */
58#define PL_RESET_IN (1<<3) /* reset input pipe */
59#define PL_TX_C (1<<2) /* transmission complete */
60#define PL_TX_REQ (1<<1) /* transmission received */
61#define PL_PEER_E (1<<0) /* peer exists */
62
63static inline int
64pl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index)
65{
66 return usb_control_msg(dev->udev,
67 usb_rcvctrlpipe(dev->udev, 0),
68 req,
69 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
70 val, index,
71 NULL, 0,
72 USB_CTRL_GET_TIMEOUT);
73}
74
75static inline int
76pl_clear_QuickLink_features(struct usbnet *dev, int val)
77{
78 return pl_vendor_req(dev, 1, (u8) val, 0);
79}
80
81static inline int
82pl_set_QuickLink_features(struct usbnet *dev, int val)
83{
84 return pl_vendor_req(dev, 3, (u8) val, 0);
85}
86
87static int pl_reset(struct usbnet *dev)
88{
89 /* some units seem to need this reset, others reject it utterly.
90 * FIXME be more like "naplink" or windows drivers.
91 */
92 (void) pl_set_QuickLink_features(dev,
93 PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E);
94 return 0;
95}
96
97static const struct driver_info prolific_info = {
98 .description = "Prolific PL-2301/PL-2302",
99 .flags = FLAG_NO_SETINT,
100 /* some PL-2302 versions seem to fail usb_set_interface() */
101 .reset = pl_reset,
102};
103
104
105/*-------------------------------------------------------------------------*/
106
107/*
108 * Proilific's name won't normally be on the cables, and
109 * may not be on the device.
110 */
111
112static const struct usb_device_id products [] = {
113
114{
115 USB_DEVICE(0x067b, 0x0000), // PL-2301
116 .driver_info = (unsigned long) &prolific_info,
117}, {
118 USB_DEVICE(0x067b, 0x0001), // PL-2302
119 .driver_info = (unsigned long) &prolific_info,
120},
121
122 { }, // END
123};
124MODULE_DEVICE_TABLE(usb, products);
125
126static struct usb_driver plusb_driver = {
David Brownell090ffa92005-08-31 09:54:50 -0700127 .name = "plusb",
128 .id_table = products,
129 .probe = usbnet_probe,
130 .disconnect = usbnet_disconnect,
131 .suspend = usbnet_suspend,
132 .resume = usbnet_resume,
133};
134
135static int __init plusb_init(void)
136{
137 return usb_register(&plusb_driver);
138}
139module_init(plusb_init);
140
141static void __exit plusb_exit(void)
142{
143 usb_deregister(&plusb_driver);
144}
145module_exit(plusb_exit);
146
147MODULE_AUTHOR("David Brownell");
148MODULE_DESCRIPTION("Prolific PL-2301/2302 USB Host to Host Link Driver");
149MODULE_LICENSE("GPL");