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1/*
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
23#include <linux/config.h>
24#ifdef CONFIG_USB_DEBUG
25# define DEBUG
26#endif
27#include <linux/module.h>
28#include <linux/sched.h>
29#include <linux/init.h>
30#include <linux/netdevice.h>
31#include <linux/etherdevice.h>
32#include <linux/ethtool.h>
33#include <linux/workqueue.h>
34#include <linux/mii.h>
35#include <linux/usb.h>
36
37#include "usbnet.h"
38
39
40/*
41 * Prolific PL-2301/PL-2302 driver ... http://www.prolifictech.com
42 *
43 * The protocol and handshaking used here should be bug-compatible
44 * with the Linux 2.2 "plusb" driver, by Deti Fliegl.
45 *
46 * HEADS UP: this handshaking isn't all that robust. This driver
47 * gets confused easily if you unplug one end of the cable then
48 * try to connect it again; you'll need to restart both ends. The
49 * "naplink" software (used by some PlayStation/2 deveopers) does
50 * the handshaking much better! Also, sometimes this hardware
51 * seems to get wedged under load. Prolific docs are weak, and
52 * don't identify differences between PL2301 and PL2302, much less
53 * anything to explain the different PL2302 versions observed.
54 */
55
56/*
57 * Bits 0-4 can be used for software handshaking; they're set from
58 * one end, cleared from the other, "read" with the interrupt byte.
59 */
60#define PL_S_EN (1<<7) /* (feature only) suspend enable */
61/* reserved bit -- rx ready (6) ? */
62#define PL_TX_READY (1<<5) /* (interrupt only) transmit ready */
63#define PL_RESET_OUT (1<<4) /* reset output pipe */
64#define PL_RESET_IN (1<<3) /* reset input pipe */
65#define PL_TX_C (1<<2) /* transmission complete */
66#define PL_TX_REQ (1<<1) /* transmission received */
67#define PL_PEER_E (1<<0) /* peer exists */
68
69static inline int
70pl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index)
71{
72 return usb_control_msg(dev->udev,
73 usb_rcvctrlpipe(dev->udev, 0),
74 req,
75 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
76 val, index,
77 NULL, 0,
78 USB_CTRL_GET_TIMEOUT);
79}
80
81static inline int
82pl_clear_QuickLink_features(struct usbnet *dev, int val)
83{
84 return pl_vendor_req(dev, 1, (u8) val, 0);
85}
86
87static inline int
88pl_set_QuickLink_features(struct usbnet *dev, int val)
89{
90 return pl_vendor_req(dev, 3, (u8) val, 0);
91}
92
93static int pl_reset(struct usbnet *dev)
94{
95 /* some units seem to need this reset, others reject it utterly.
96 * FIXME be more like "naplink" or windows drivers.
97 */
98 (void) pl_set_QuickLink_features(dev,
99 PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E);
100 return 0;
101}
102
103static const struct driver_info prolific_info = {
104 .description = "Prolific PL-2301/PL-2302",
105 .flags = FLAG_NO_SETINT,
106 /* some PL-2302 versions seem to fail usb_set_interface() */
107 .reset = pl_reset,
108};
109
110
111/*-------------------------------------------------------------------------*/
112
113/*
114 * Proilific's name won't normally be on the cables, and
115 * may not be on the device.
116 */
117
118static const struct usb_device_id products [] = {
119
120{
121 USB_DEVICE(0x067b, 0x0000), // PL-2301
122 .driver_info = (unsigned long) &prolific_info,
123}, {
124 USB_DEVICE(0x067b, 0x0001), // PL-2302
125 .driver_info = (unsigned long) &prolific_info,
126},
127
128 { }, // END
129};
130MODULE_DEVICE_TABLE(usb, products);
131
132static struct usb_driver plusb_driver = {
133 .owner = THIS_MODULE,
134 .name = "plusb",
135 .id_table = products,
136 .probe = usbnet_probe,
137 .disconnect = usbnet_disconnect,
138 .suspend = usbnet_suspend,
139 .resume = usbnet_resume,
140};
141
142static int __init plusb_init(void)
143{
144 return usb_register(&plusb_driver);
145}
146module_init(plusb_init);
147
148static void __exit plusb_exit(void)
149{
150 usb_deregister(&plusb_driver);
151}
152module_exit(plusb_exit);
153
154MODULE_AUTHOR("David Brownell");
155MODULE_DESCRIPTION("Prolific PL-2301/2302 USB Host to Host Link Driver");
156MODULE_LICENSE("GPL");