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090ffa9d DB |
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 | |
9cb00073 | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
090ffa9d DB |
17 | */ |
18 | ||
19 | // #define DEBUG // error path messages, extra info | |
20 | // #define VERBOSE // more; success messages | |
21 | ||
090ffa9d | 22 | #include <linux/module.h> |
090ffa9d DB |
23 | #include <linux/netdevice.h> |
24 | #include <linux/etherdevice.h> | |
25 | #include <linux/ethtool.h> | |
26 | #include <linux/workqueue.h> | |
27 | #include <linux/mii.h> | |
28 | #include <linux/usb.h> | |
3692e94f | 29 | #include <linux/usb/usbnet.h> |
090ffa9d DB |
30 | |
31 | ||
32 | /* | |
631dd1a8 | 33 | * Prolific PL-2301/PL-2302 driver ... http://www.prolific.com.tw/ |
090ffa9d DB |
34 | * |
35 | * The protocol and handshaking used here should be bug-compatible | |
36 | * with the Linux 2.2 "plusb" driver, by Deti Fliegl. | |
37 | * | |
38 | * HEADS UP: this handshaking isn't all that robust. This driver | |
39 | * gets confused easily if you unplug one end of the cable then | |
40 | * try to connect it again; you'll need to restart both ends. The | |
a69f0e28 | 41 | * "naplink" software (used by some PlayStation/2 developers) does |
090ffa9d DB |
42 | * the handshaking much better! Also, sometimes this hardware |
43 | * seems to get wedged under load. Prolific docs are weak, and | |
44 | * don't identify differences between PL2301 and PL2302, much less | |
45 | * anything to explain the different PL2302 versions observed. | |
647da406 | 46 | * |
47 | * NOTE: pl2501 has several modes, including pl2301 and pl2302 | |
48 | * compatibility. Some docs suggest the difference between 2301 | |
49 | * and 2302 is only to make MS-Windows use a different driver... | |
50 | * | |
51 | * pl25a1 glue based on patch from Tony Gibbs. Prolific "docs" on | |
52 | * this chip are as usual incomplete about what control messages | |
53 | * are supported. | |
090ffa9d DB |
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 | { | |
7cdd2487 ML |
72 | return usbnet_read_cmd(dev, req, |
73 | USB_DIR_IN | USB_TYPE_VENDOR | | |
74 | USB_RECIP_DEVICE, | |
75 | val, index, NULL, 0); | |
090ffa9d DB |
76 | } |
77 | ||
78 | static inline int | |
79 | pl_clear_QuickLink_features(struct usbnet *dev, int val) | |
80 | { | |
81 | return pl_vendor_req(dev, 1, (u8) val, 0); | |
82 | } | |
83 | ||
84 | static inline int | |
85 | pl_set_QuickLink_features(struct usbnet *dev, int val) | |
86 | { | |
87 | return pl_vendor_req(dev, 3, (u8) val, 0); | |
88 | } | |
89 | ||
90 | static int pl_reset(struct usbnet *dev) | |
91 | { | |
5325e92f | 92 | int status; |
93 | ||
090ffa9d DB |
94 | /* some units seem to need this reset, others reject it utterly. |
95 | * FIXME be more like "naplink" or windows drivers. | |
96 | */ | |
5325e92f | 97 | status = pl_set_QuickLink_features(dev, |
090ffa9d | 98 | PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E); |
5325e92f | 99 | if (status != 0 && netif_msg_probe(dev)) |
100 | netif_dbg(dev, link, dev->net, "pl_reset --> %d\n", status); | |
090ffa9d DB |
101 | return 0; |
102 | } | |
103 | ||
104 | static const struct driver_info prolific_info = { | |
647da406 | 105 | .description = "Prolific PL-2301/PL-2302/PL-25A1", |
c261344d | 106 | .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT, |
090ffa9d DB |
107 | /* some PL-2302 versions seem to fail usb_set_interface() */ |
108 | .reset = pl_reset, | |
109 | }; | |
110 | ||
111 | ||
112 | /*-------------------------------------------------------------------------*/ | |
113 | ||
114 | /* | |
115 | * Proilific's name won't normally be on the cables, and | |
116 | * may not be on the device. | |
117 | */ | |
118 | ||
119 | static const struct usb_device_id products [] = { | |
120 | ||
647da406 | 121 | /* full speed cables */ |
090ffa9d DB |
122 | { |
123 | USB_DEVICE(0x067b, 0x0000), // PL-2301 | |
124 | .driver_info = (unsigned long) &prolific_info, | |
125 | }, { | |
126 | USB_DEVICE(0x067b, 0x0001), // PL-2302 | |
127 | .driver_info = (unsigned long) &prolific_info, | |
128 | }, | |
129 | ||
647da406 | 130 | /* high speed cables */ |
131 | { | |
132 | USB_DEVICE(0x067b, 0x25a1), /* PL-25A1, no eeprom */ | |
133 | .driver_info = (unsigned long) &prolific_info, | |
134 | }, { | |
135 | USB_DEVICE(0x050d, 0x258a), /* Belkin F5U258/F5U279 (PL-25A1) */ | |
136 | .driver_info = (unsigned long) &prolific_info, | |
42c972a1 BS |
137 | }, { |
138 | USB_DEVICE(0x3923, 0x7825), /* National Instruments USB | |
139 | * Host-to-Host Cable | |
140 | */ | |
141 | .driver_info = (unsigned long) &prolific_info, | |
647da406 | 142 | }, |
143 | ||
090ffa9d DB |
144 | { }, // END |
145 | }; | |
146 | MODULE_DEVICE_TABLE(usb, products); | |
147 | ||
148 | static struct usb_driver plusb_driver = { | |
090ffa9d DB |
149 | .name = "plusb", |
150 | .id_table = products, | |
151 | .probe = usbnet_probe, | |
152 | .disconnect = usbnet_disconnect, | |
153 | .suspend = usbnet_suspend, | |
154 | .resume = usbnet_resume, | |
e1f12eb6 | 155 | .disable_hub_initiated_lpm = 1, |
090ffa9d DB |
156 | }; |
157 | ||
d632eb1b | 158 | module_usb_driver(plusb_driver); |
090ffa9d DB |
159 | |
160 | MODULE_AUTHOR("David Brownell"); | |
647da406 | 161 | MODULE_DESCRIPTION("Prolific PL-2301/2302/25A1 USB Host to Host Link Driver"); |
090ffa9d | 162 | MODULE_LICENSE("GPL"); |