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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 | |
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 | ||
090ffa9d | 23 | #include <linux/module.h> |
090ffa9d DB |
24 | #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> | |
3692e94f | 31 | #include <linux/usb/usbnet.h> |
090ffa9d DB |
32 | |
33 | ||
34 | /* | |
631dd1a8 | 35 | * Prolific PL-2301/PL-2302 driver ... http://www.prolific.com.tw/ |
090ffa9d DB |
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. | |
647da406 | 48 | * |
49 | * NOTE: pl2501 has several modes, including pl2301 and pl2302 | |
50 | * compatibility. Some docs suggest the difference between 2301 | |
51 | * and 2302 is only to make MS-Windows use a different driver... | |
52 | * | |
53 | * pl25a1 glue based on patch from Tony Gibbs. Prolific "docs" on | |
54 | * this chip are as usual incomplete about what control messages | |
55 | * are supported. | |
090ffa9d DB |
56 | */ |
57 | ||
58 | /* | |
59 | * Bits 0-4 can be used for software handshaking; they're set from | |
60 | * one end, cleared from the other, "read" with the interrupt byte. | |
61 | */ | |
62 | #define PL_S_EN (1<<7) /* (feature only) suspend enable */ | |
63 | /* reserved bit -- rx ready (6) ? */ | |
64 | #define PL_TX_READY (1<<5) /* (interrupt only) transmit ready */ | |
65 | #define PL_RESET_OUT (1<<4) /* reset output pipe */ | |
66 | #define PL_RESET_IN (1<<3) /* reset input pipe */ | |
67 | #define PL_TX_C (1<<2) /* transmission complete */ | |
68 | #define PL_TX_REQ (1<<1) /* transmission received */ | |
69 | #define PL_PEER_E (1<<0) /* peer exists */ | |
70 | ||
71 | static inline int | |
72 | pl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index) | |
73 | { | |
74 | return usb_control_msg(dev->udev, | |
75 | usb_rcvctrlpipe(dev->udev, 0), | |
76 | req, | |
77 | USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, | |
78 | val, index, | |
79 | NULL, 0, | |
80 | USB_CTRL_GET_TIMEOUT); | |
81 | } | |
82 | ||
83 | static inline int | |
84 | pl_clear_QuickLink_features(struct usbnet *dev, int val) | |
85 | { | |
86 | return pl_vendor_req(dev, 1, (u8) val, 0); | |
87 | } | |
88 | ||
89 | static inline int | |
90 | pl_set_QuickLink_features(struct usbnet *dev, int val) | |
91 | { | |
92 | return pl_vendor_req(dev, 3, (u8) val, 0); | |
93 | } | |
94 | ||
95 | static int pl_reset(struct usbnet *dev) | |
96 | { | |
5325e92f | 97 | int status; |
98 | ||
090ffa9d DB |
99 | /* some units seem to need this reset, others reject it utterly. |
100 | * FIXME be more like "naplink" or windows drivers. | |
101 | */ | |
5325e92f | 102 | status = pl_set_QuickLink_features(dev, |
090ffa9d | 103 | PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E); |
5325e92f | 104 | if (status != 0 && netif_msg_probe(dev)) |
105 | netif_dbg(dev, link, dev->net, "pl_reset --> %d\n", status); | |
090ffa9d DB |
106 | return 0; |
107 | } | |
108 | ||
109 | static const struct driver_info prolific_info = { | |
647da406 | 110 | .description = "Prolific PL-2301/PL-2302/PL-25A1", |
c261344d | 111 | .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT, |
090ffa9d DB |
112 | /* some PL-2302 versions seem to fail usb_set_interface() */ |
113 | .reset = pl_reset, | |
114 | }; | |
115 | ||
116 | ||
117 | /*-------------------------------------------------------------------------*/ | |
118 | ||
119 | /* | |
120 | * Proilific's name won't normally be on the cables, and | |
121 | * may not be on the device. | |
122 | */ | |
123 | ||
124 | static const struct usb_device_id products [] = { | |
125 | ||
647da406 | 126 | /* full speed cables */ |
090ffa9d DB |
127 | { |
128 | USB_DEVICE(0x067b, 0x0000), // PL-2301 | |
129 | .driver_info = (unsigned long) &prolific_info, | |
130 | }, { | |
131 | USB_DEVICE(0x067b, 0x0001), // PL-2302 | |
132 | .driver_info = (unsigned long) &prolific_info, | |
133 | }, | |
134 | ||
647da406 | 135 | /* high speed cables */ |
136 | { | |
137 | USB_DEVICE(0x067b, 0x25a1), /* PL-25A1, no eeprom */ | |
138 | .driver_info = (unsigned long) &prolific_info, | |
139 | }, { | |
140 | USB_DEVICE(0x050d, 0x258a), /* Belkin F5U258/F5U279 (PL-25A1) */ | |
141 | .driver_info = (unsigned long) &prolific_info, | |
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"); |