drivers/usb/net/cdc_subset.c

   1 /*
   2  * Simple "CDC Subset" USB Networking Links
   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 #include <linux/config.h>
  21 #include <linux/module.h>
  22 #include <linux/kmod.h>
  23 #include <linux/sched.h>
  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>
  31
  32 #include "usbnet.h"
  33
  34
  35 /*
  36  * This supports simple USB network links that don't require any special
  37  * framing or hardware control operations.  The protocol used here is a
  38  * strict subset of CDC Ethernet, with three basic differences reflecting
  39  * the goal that almost any hardware should run it:
  40  *
  41  *  - Minimal runtime control:  one interface, no altsettings, and
  42  *    no vendor or class specific control requests.  If a device is
  43  *    configured, it is allowed to exchange packets with the host.
  44  *    Fancier models would mean not working on some hardware.
  45  *
  46  *  - Minimal manufacturing control:  no IEEE "Organizationally
  47  *    Unique ID" required, or an EEPROMs to store one.  Each host uses
  48  *    one random "locally assigned" Ethernet address instead, which can
  49  *    of course be overridden using standard tools like "ifconfig".
  50  *    (With 2^46 such addresses, same-net collisions are quite rare.)
  51  *
  52  *  - There is no additional framing data for USB.  Packets are written
  53  *    exactly as in CDC Ethernet, starting with an Ethernet header and
  54  *    terminated by a short packet.  However, the host will never send a
  55  *    zero length packet; some systems can't handle those robustly.
  56  *
  57  * Anything that can transmit and receive USB bulk packets can implement
  58  * this protocol.  That includes both smart peripherals and quite a lot
  59  * of "host-to-host" USB cables (which embed two devices back-to-back).
  60  *
  61  * Note that although Linux may use many of those host-to-host links
  62  * with this "cdc_subset" framing, that doesn't mean there may not be a
  63  * better approach.  Handling the "other end unplugs/replugs" scenario
  64  * well tends to require chip-specific vendor requests.  Also, Windows
  65  * peers at the other end of host-to-host cables may expect their own
  66  * framing to be used rather than this "cdc_subset" model.
  67  */
  68
  69 #if defined(CONFIG_USB_EPSON2888) || defined(CONFIG_USB_ARMLINUX)
  70 /* PDA style devices are always connected if present */
  71 static int always_connected (struct usbnet *dev)
  72 {
  73         return 0;
  74 }
  75 #endif
  76
  77 #ifdef  CONFIG_USB_ALI_M5632
  78 #define HAVE_HARDWARE
  79
  80 /*-------------------------------------------------------------------------
  81  *
  82  * ALi M5632 driver ... does high speed
  83  *
  84  *-------------------------------------------------------------------------*/
  85
  86 static const struct driver_info ali_m5632_info = {
  87         .description =  "ALi M5632",
  88 };
  89
  90
  91 #endif
  92
  93 \f
  94 #ifdef  CONFIG_USB_AN2720
  95 #define HAVE_HARDWARE
  96
  97 /*-------------------------------------------------------------------------
  98  *
  99  * AnchorChips 2720 driver ... http://www.cypress.com
 100  *
 101  * This doesn't seem to have a way to detect whether the peer is
 102  * connected, or need any reset handshaking.  It's got pretty big
 103  * internal buffers (handles most of a frame's worth of data).
 104  * Chip data sheets don't describe any vendor control messages.
 105  *
 106  *-------------------------------------------------------------------------*/
 107
 108 static const struct driver_info an2720_info = {
 109         .description =  "AnchorChips/Cypress 2720",
 110         // no reset available!
 111         // no check_connect available!
 112
 113         .in = 2, .out = 2,              // direction distinguishes these
 114 };
 115
 116 #endif  /* CONFIG_USB_AN2720 */
 117
 118 \f
 119 #ifdef  CONFIG_USB_BELKIN
 120 #define HAVE_HARDWARE
 121
 122 /*-------------------------------------------------------------------------
 123  *
 124  * Belkin F5U104 ... two NetChip 2280 devices + Atmel AVR microcontroller
 125  *
 126  * ... also two eTEK designs, including one sold as "Advance USBNET"
 127  *
 128  *-------------------------------------------------------------------------*/
 129
 130 static const struct driver_info belkin_info = {
 131         .description =  "Belkin, eTEK, or compatible",
 132 };
 133
 134 #endif  /* CONFIG_USB_BELKIN */
 135
 136
 137 \f
 138 #ifdef  CONFIG_USB_EPSON2888
 139 #define HAVE_HARDWARE
 140
 141 /*-------------------------------------------------------------------------
 142  *
 143  * EPSON USB clients
 144  *
 145  * This is the same idea as Linux PDAs (below) except the firmware in the
 146  * device might not be Tux-powered.  Epson provides reference firmware that
 147  * implements this interface.  Product developers can reuse or modify that
 148  * code, such as by using their own product and vendor codes.
 149  *
 150  * Support was from Juro Bystricky <bystricky.juro@erd.epson.com>
 151  *
 152  *-------------------------------------------------------------------------*/
 153
 154 static const struct driver_info epson2888_info = {
 155         .description =  "Epson USB Device",
 156         .check_connect = always_connected,
 157
 158         .in = 4, .out = 3,
 159 };
 160
 161 #endif  /* CONFIG_USB_EPSON2888 */
 162
 163 \f
 164 #ifdef CONFIG_USB_KC2190
 165 #define HAVE_HARDWARE
 166 static const struct driver_info kc2190_info = {
 167         .description =  "KC Technology KC-190",
 168 };
 169 #endif /* CONFIG_USB_KC2190 */
 170
 171 \f
 172 #ifdef  CONFIG_USB_ARMLINUX
 173 #define HAVE_HARDWARE
 174
 175 /*-------------------------------------------------------------------------
 176  *
 177  * Intel's SA-1100 chip integrates basic USB support, and is used
 178  * in PDAs like some iPaqs, the Yopy, some Zaurus models, and more.
 179  * When they run Linux, arch/arm/mach-sa1100/usb-eth.c may be used to
 180  * network using minimal USB framing data.
 181  *
 182  * This describes the driver currently in standard ARM Linux kernels.
 183  * The Zaurus uses a different driver (see later).
 184  *
 185  * PXA25x and PXA210 use XScale cores (ARM v5TE) with better USB support
 186  * and different USB endpoint numbering than the SA1100 devices.  The
 187  * mach-pxa/usb-eth.c driver re-uses the device ids from mach-sa1100
 188  * so we rely on the endpoint descriptors.
 189  *
 190  *-------------------------------------------------------------------------*/
 191
 192 static const struct driver_info linuxdev_info = {
 193         .description =  "Linux Device",
 194         .check_connect = always_connected,
 195 };
 196
 197 static const struct driver_info yopy_info = {
 198         .description =  "Yopy",
 199         .check_connect = always_connected,
 200 };
 201
 202 static const struct driver_info blob_info = {
 203         .description =  "Boot Loader OBject",
 204         .check_connect = always_connected,
 205 };
 206
 207 #endif  /* CONFIG_USB_ARMLINUX */
 208
 209 \f
 210 /*-------------------------------------------------------------------------*/
 211
 212 #ifndef HAVE_HARDWARE
 213 #error You need to configure some hardware for this driver
 214 #endif
 215
 216 /*
 217  * chip vendor names won't normally be on the cables, and
 218  * may not be on the device.
 219  */
 220
 221 static const struct usb_device_id       products [] = {
 222
 223 #ifdef  CONFIG_USB_ALI_M5632
 224 {
 225         USB_DEVICE (0x0402, 0x5632),    // ALi defaults
 226         .driver_info =  (unsigned long) &ali_m5632_info,
 227 },
 228 #endif
 229
 230 #ifdef  CONFIG_USB_AN2720
 231 {
 232         USB_DEVICE (0x0547, 0x2720),    // AnchorChips defaults
 233         .driver_info =  (unsigned long) &an2720_info,
 234 }, {
 235         USB_DEVICE (0x0547, 0x2727),    // Xircom PGUNET
 236         .driver_info =  (unsigned long) &an2720_info,
 237 },
 238 #endif
 239
 240 #ifdef  CONFIG_USB_BELKIN
 241 {
 242         USB_DEVICE (0x050d, 0x0004),    // Belkin
 243         .driver_info =  (unsigned long) &belkin_info,
 244 }, {
 245         USB_DEVICE (0x056c, 0x8100),    // eTEK
 246         .driver_info =  (unsigned long) &belkin_info,
 247 }, {
 248         USB_DEVICE (0x0525, 0x9901),    // Advance USBNET (eTEK)
 249         .driver_info =  (unsigned long) &belkin_info,
 250 },
 251 #endif
 252
 253 #ifdef  CONFIG_USB_EPSON2888
 254 {
 255         USB_DEVICE (0x0525, 0x2888),    // EPSON USB client
 256         .driver_info    = (unsigned long) &epson2888_info,
 257 },
 258 #endif
 259
 260 #ifdef CONFIG_USB_KC2190
 261 {
 262         USB_DEVICE (0x050f, 0x0190),    // KC-190
 263         .driver_info =  (unsigned long) &kc2190_info,
 264 },
 265 #endif
 266
 267 #ifdef  CONFIG_USB_ARMLINUX
 268 /*
 269  * SA-1100 using standard ARM Linux kernels, or compatible.
 270  * Often used when talking to Linux PDAs (iPaq, Yopy, etc).
 271  * The sa-1100 "usb-eth" driver handles the basic framing.
 272  *
 273  * PXA25x or PXA210 ...  these use a "usb-eth" driver much like
 274  * the sa1100 one, but hardware uses different endpoint numbers.
 275  *
 276  * Or the Linux "Ethernet" gadget on hardware that can't talk
 277  * CDC Ethernet (e.g., no altsettings), in either of two modes:
 278  *  - acting just like the old "usb-eth" firmware, though
 279  *    the implementation is different
 280  *  - supporting RNDIS as the first/default configuration for
 281  *    MS-Windows interop; Linux needs to use the other config
 282  */
 283 {
 284         // 1183 = 0x049F, both used as hex values?
 285         // Compaq "Itsy" vendor/product id
 286         USB_DEVICE (0x049F, 0x505A),    // usb-eth, or compatible
 287         .driver_info =  (unsigned long) &linuxdev_info,
 288 }, {
 289         USB_DEVICE (0x0E7E, 0x1001),    // G.Mate "Yopy"
 290         .driver_info =  (unsigned long) &yopy_info,
 291 }, {
 292         USB_DEVICE (0x8086, 0x07d3),    // "blob" bootloader
 293         .driver_info =  (unsigned long) &blob_info,
 294 }, {
 295         // Linux Ethernet/RNDIS gadget on pxa210/25x/26x, second config
 296         // e.g. Gumstix, current OpenZaurus, ...
 297         USB_DEVICE_VER (0x0525, 0xa4a2, 0x0203, 0x0203),
 298         .driver_info =  (unsigned long) &linuxdev_info,
 299 },
 300 #endif
 301
 302         { },            // END
 303 };
 304 MODULE_DEVICE_TABLE(usb, products);
 305
 306 /*-------------------------------------------------------------------------*/
 307
 308 static struct usb_driver cdc_subset_driver = {
 309         .name =         "cdc_subset",
 310         .probe =        usbnet_probe,
 311         .suspend =      usbnet_suspend,
 312         .resume =       usbnet_resume,
 313         .disconnect =   usbnet_disconnect,
 314         .id_table =     products,
 315 };
 316
 317 static int __init cdc_subset_init(void)
 318 {
 319         return usb_register(&cdc_subset_driver);
 320 }
 321 module_init(cdc_subset_init);
 322
 323 static void __exit cdc_subset_exit(void)
 324 {
 325         usb_deregister(&cdc_subset_driver);
 326 }
 327 module_exit(cdc_subset_exit);
 328
 329 MODULE_AUTHOR("David Brownell");
 330 MODULE_DESCRIPTION("Simple 'CDC Subset' USB networking links");
 331 MODULE_LICENSE("GPL");