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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 | ||
69 | static inline int | |
70 | pl_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 | ||
81 | static inline int | |
82 | pl_clear_QuickLink_features(struct usbnet *dev, int val) | |
83 | { | |
84 | return pl_vendor_req(dev, 1, (u8) val, 0); | |
85 | } | |
86 | ||
87 | static inline int | |
88 | pl_set_QuickLink_features(struct usbnet *dev, int val) | |
89 | { | |
90 | return pl_vendor_req(dev, 3, (u8) val, 0); | |
91 | } | |
92 | ||
93 | static 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 | ||
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() */ | |
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 | ||
118 | static 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 | }; | |
130 | MODULE_DEVICE_TABLE(usb, products); | |
131 | ||
132 | static 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 | ||
142 | static int __init plusb_init(void) | |
143 | { | |
144 | return usb_register(&plusb_driver); | |
145 | } | |
146 | module_init(plusb_init); | |
147 | ||
148 | static void __exit plusb_exit(void) | |
149 | { | |
150 | usb_deregister(&plusb_driver); | |
151 | } | |
152 | module_exit(plusb_exit); | |
153 | ||
154 | MODULE_AUTHOR("David Brownell"); | |
155 | MODULE_DESCRIPTION("Prolific PL-2301/2302 USB Host to Host Link Driver"); | |
156 | MODULE_LICENSE("GPL"); |