2 * PL-2301/2302 USB host-to-host link cables
3 * Copyright (C) 2000-2005 by David Brownell
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.
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.
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
20 // #define DEBUG // error path messages, extra info
21 // #define VERBOSE // more; success messages
23 #include <linux/config.h>
24 #ifdef CONFIG_USB_DEBUG
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>
41 * Prolific PL-2301/PL-2302 driver ... http://www.prolifictech.com
43 * The protocol and handshaking used here should be bug-compatible
44 * with the Linux 2.2 "plusb" driver, by Deti Fliegl.
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.
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.
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 */
70 pl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index)
72 return usb_control_msg(dev->udev,
73 usb_rcvctrlpipe(dev->udev, 0),
75 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
78 USB_CTRL_GET_TIMEOUT);
82 pl_clear_QuickLink_features(struct usbnet *dev, int val)
84 return pl_vendor_req(dev, 1, (u8) val, 0);
88 pl_set_QuickLink_features(struct usbnet *dev, int val)
90 return pl_vendor_req(dev, 3, (u8) val, 0);
93 static int pl_reset(struct usbnet *dev)
95 /* some units seem to need this reset, others reject it utterly.
96 * FIXME be more like "naplink" or windows drivers.
98 (void) pl_set_QuickLink_features(dev,
99 PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E);
103 static 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() */
111 /*-------------------------------------------------------------------------*/
114 * Proilific's name won't normally be on the cables, and
115 * may not be on the device.
118 static const struct usb_device_id products [] = {
121 USB_DEVICE(0x067b, 0x0000), // PL-2301
122 .driver_info = (unsigned long) &prolific_info,
124 USB_DEVICE(0x067b, 0x0001), // PL-2302
125 .driver_info = (unsigned long) &prolific_info,
130 MODULE_DEVICE_TABLE(usb, products);
132 static struct usb_driver plusb_driver = {
133 .owner = THIS_MODULE,
135 .id_table = products,
136 .probe = usbnet_probe,
137 .disconnect = usbnet_disconnect,
138 .suspend = usbnet_suspend,
139 .resume = usbnet_resume,
142 static int __init plusb_init(void)
144 return usb_register(&plusb_driver);
146 module_init(plusb_init);
148 static void __exit plusb_exit(void)
150 usb_deregister(&plusb_driver);
152 module_exit(plusb_exit);
154 MODULE_AUTHOR("David Brownell");
155 MODULE_DESCRIPTION("Prolific PL-2301/2302 USB Host to Host Link Driver");
156 MODULE_LICENSE("GPL");