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Linux/drivers/net/usb/plusb.c

  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, see <http://www.gnu.org/licenses/>.
 17  */
 18 
 19 // #define      DEBUG                   // error path messages, extra info
 20 // #define      VERBOSE                 // more; success messages
 21 
 22 #include <linux/module.h>
 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>
 29 #include <linux/usb/usbnet.h>
 30 
 31 
 32 /*
 33  * Prolific PL-2301/PL-2302 driver ... http://www.prolific.com.tw/ 
 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
 41  * "naplink" software (used by some PlayStation/2 deveopers) does
 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.
 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.
 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 usbnet_read_cmd(dev, req,
 73                                 USB_DIR_IN | USB_TYPE_VENDOR |
 74                                 USB_RECIP_DEVICE,
 75                                 val, index, NULL, 0);
 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 {
 92         int status;
 93 
 94         /* some units seem to need this reset, others reject it utterly.
 95          * FIXME be more like "naplink" or windows drivers.
 96          */
 97         status = pl_set_QuickLink_features(dev,
 98                 PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E);
 99         if (status != 0 && netif_msg_probe(dev))
100                 netif_dbg(dev, link, dev->net, "pl_reset --> %d\n", status);
101         return 0;
102 }
103 
104 static const struct driver_info prolific_info = {
105         .description =  "Prolific PL-2301/PL-2302/PL-25A1",
106         .flags =        FLAG_POINTTOPOINT | FLAG_NO_SETINT,
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 
121 /* full speed cables */
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 
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,
137 },
138 
139         { },            // END
140 };
141 MODULE_DEVICE_TABLE(usb, products);
142 
143 static struct usb_driver plusb_driver = {
144         .name =         "plusb",
145         .id_table =     products,
146         .probe =        usbnet_probe,
147         .disconnect =   usbnet_disconnect,
148         .suspend =      usbnet_suspend,
149         .resume =       usbnet_resume,
150         .disable_hub_initiated_lpm = 1,
151 };
152 
153 module_usb_driver(plusb_driver);
154 
155 MODULE_AUTHOR("David Brownell");
156 MODULE_DESCRIPTION("Prolific PL-2301/2302/25A1 USB Host to Host Link Driver");
157 MODULE_LICENSE("GPL");
158 

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