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/module.h> 21 #include <linux/kmod.h> 22 #include <linux/init.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 30 #include "usbnet.h" 31 32 33 /* 34 * This supports simple USB network links that don't require any special 35 * framing or hardware control operations. The protocol used here is a 36 * strict subset of CDC Ethernet, with three basic differences reflecting 37 * the goal that almost any hardware should run it: 38 * 39 * - Minimal runtime control: one interface, no altsettings, and 40 * no vendor or class specific control requests. If a device is 41 * configured, it is allowed to exchange packets with the host. 42 * Fancier models would mean not working on some hardware. 43 * 44 * - Minimal manufacturing control: no IEEE "Organizationally 45 * Unique ID" required, or an EEPROMs to store one. Each host uses 46 * one random "locally assigned" Ethernet address instead, which can 47 * of course be overridden using standard tools like "ifconfig". 48 * (With 2^46 such addresses, same-net collisions are quite rare.) 49 * 50 * - There is no additional framing data for USB. Packets are written 51 * exactly as in CDC Ethernet, starting with an Ethernet header and 52 * terminated by a short packet. However, the host will never send a 53 * zero length packet; some systems can't handle those robustly. 54 * 55 * Anything that can transmit and receive USB bulk packets can implement 56 * this protocol. That includes both smart peripherals and quite a lot 57 * of "host-to-host" USB cables (which embed two devices back-to-back). 58 * 59 * Note that although Linux may use many of those host-to-host links 60 * with this "cdc_subset" framing, that doesn't mean there may not be a 61 * better approach. Handling the "other end unplugs/replugs" scenario 62 * well tends to require chip-specific vendor requests. Also, Windows 63 * peers at the other end of host-to-host cables may expect their own 64 * framing to be used rather than this "cdc_subset" model. 65 */ 66 67 #if defined(CONFIG_USB_EPSON2888) || defined(CONFIG_USB_ARMLINUX) 68 /* PDA style devices are always connected if present */ 69 static int always_connected (struct usbnet *dev) 70 { 71 return 0; 72 } 73 #endif 74 75 #ifdef CONFIG_USB_ALI_M5632 76 #define HAVE_HARDWARE 77 78 /*------------------------------------------------------------------------- 79 * 80 * ALi M5632 driver ... does high speed 81 * 82 * NOTE that the MS-Windows drivers for this chip use some funky and 83 * (naturally) undocumented 7-byte prefix to each packet, so this is a 84 * case where we don't currently interoperate. Also, once you unplug 85 * one end of the cable, you need to replug the other end too ... since 86 * chip docs are unavailable, there's no way to reset the relevant state 87 * short of a power cycle. 88 * 89 *-------------------------------------------------------------------------*/ 90 91 static const struct driver_info ali_m5632_info = { 92 .description = "ALi M5632", 93 }; 94 95 #endif 96 97 98 #ifdef CONFIG_USB_AN2720 99 #define HAVE_HARDWARE 100 101 /*------------------------------------------------------------------------- 102 * 103 * AnchorChips 2720 driver ... http://www.cypress.com 104 * 105 * This doesn't seem to have a way to detect whether the peer is 106 * connected, or need any reset handshaking. It's got pretty big 107 * internal buffers (handles most of a frame's worth of data). 108 * Chip data sheets don't describe any vendor control messages. 109 * 110 *-------------------------------------------------------------------------*/ 111 112 static const struct driver_info an2720_info = { 113 .description = "AnchorChips/Cypress 2720", 114 // no reset available! 115 // no check_connect available! 116 117 .in = 2, .out = 2, // direction distinguishes these 118 }; 119 120 #endif /* CONFIG_USB_AN2720 */ 121 122 123 #ifdef CONFIG_USB_BELKIN 124 #define HAVE_HARDWARE 125 126 /*------------------------------------------------------------------------- 127 * 128 * Belkin F5U104 ... two NetChip 2280 devices + Atmel AVR microcontroller 129 * 130 * ... also two eTEK designs, including one sold as "Advance USBNET" 131 * 132 *-------------------------------------------------------------------------*/ 133 134 static const struct driver_info belkin_info = { 135 .description = "Belkin, eTEK, or compatible", 136 }; 137 138 #endif /* CONFIG_USB_BELKIN */ 139 140 141 142 #ifdef CONFIG_USB_EPSON2888 143 #define HAVE_HARDWARE 144 145 /*------------------------------------------------------------------------- 146 * 147 * EPSON USB clients 148 * 149 * This is the same idea as Linux PDAs (below) except the firmware in the 150 * device might not be Tux-powered. Epson provides reference firmware that 151 * implements this interface. Product developers can reuse or modify that 152 * code, such as by using their own product and vendor codes. 153 * 154 * Support was from Juro Bystricky <bystricky.juro@erd.epson.com> 155 * 156 *-------------------------------------------------------------------------*/ 157 158 static const struct driver_info epson2888_info = { 159 .description = "Epson USB Device", 160 .check_connect = always_connected, 161 162 .in = 4, .out = 3, 163 }; 164 165 #endif /* CONFIG_USB_EPSON2888 */ 166 167 168 /*------------------------------------------------------------------------- 169 * 170 * info from Jonathan McDowell <noodles@earth.li> 171 * 172 *-------------------------------------------------------------------------*/ 173 #ifdef CONFIG_USB_KC2190 174 #define HAVE_HARDWARE 175 static const struct driver_info kc2190_info = { 176 .description = "KC Technology KC-190", 177 }; 178 #endif /* CONFIG_USB_KC2190 */ 179 180 181 #ifdef CONFIG_USB_ARMLINUX 182 #define HAVE_HARDWARE 183 184 /*------------------------------------------------------------------------- 185 * 186 * Intel's SA-1100 chip integrates basic USB support, and is used 187 * in PDAs like some iPaqs, the Yopy, some Zaurus models, and more. 188 * When they run Linux, arch/arm/mach-sa1100/usb-eth.c may be used to 189 * network using minimal USB framing data. 190 * 191 * This describes the driver currently in standard ARM Linux kernels. 192 * The Zaurus uses a different driver (see later). 193 * 194 * PXA25x and PXA210 use XScale cores (ARM v5TE) with better USB support 195 * and different USB endpoint numbering than the SA1100 devices. The 196 * mach-pxa/usb-eth.c driver re-uses the device ids from mach-sa1100 197 * so we rely on the endpoint descriptors. 198 * 199 *-------------------------------------------------------------------------*/ 200 201 static const struct driver_info linuxdev_info = { 202 .description = "Linux Device", 203 .check_connect = always_connected, 204 }; 205 206 static const struct driver_info yopy_info = { 207 .description = "Yopy", 208 .check_connect = always_connected, 209 }; 210 211 static const struct driver_info blob_info = { 212 .description = "Boot Loader OBject", 213 .check_connect = always_connected, 214 }; 215 216 #endif /* CONFIG_USB_ARMLINUX */ 217 218 219 /*-------------------------------------------------------------------------*/ 220 221 #ifndef HAVE_HARDWARE 222 #error You need to configure some hardware for this driver 223 #endif 224 225 /* 226 * chip vendor names won't normally be on the cables, and 227 * may not be on the device. 228 */ 229 230 static const struct usb_device_id products [] = { 231 232 #ifdef CONFIG_USB_ALI_M5632 233 { 234 USB_DEVICE (0x0402, 0x5632), // ALi defaults 235 .driver_info = (unsigned long) &ali_m5632_info, 236 }, 237 { 238 USB_DEVICE (0x182d,0x207c), // SiteCom CN-124 239 .driver_info = (unsigned long) &ali_m5632_info, 240 }, 241 #endif 242 243 #ifdef CONFIG_USB_AN2720 244 { 245 USB_DEVICE (0x0547, 0x2720), // AnchorChips defaults 246 .driver_info = (unsigned long) &an2720_info, 247 }, { 248 USB_DEVICE (0x0547, 0x2727), // Xircom PGUNET 249 .driver_info = (unsigned long) &an2720_info, 250 }, 251 #endif 252 253 #ifdef CONFIG_USB_BELKIN 254 { 255 USB_DEVICE (0x050d, 0x0004), // Belkin 256 .driver_info = (unsigned long) &belkin_info, 257 }, { 258 USB_DEVICE (0x056c, 0x8100), // eTEK 259 .driver_info = (unsigned long) &belkin_info, 260 }, { 261 USB_DEVICE (0x0525, 0x9901), // Advance USBNET (eTEK) 262 .driver_info = (unsigned long) &belkin_info, 263 }, 264 #endif 265 266 #ifdef CONFIG_USB_EPSON2888 267 { 268 USB_DEVICE (0x0525, 0x2888), // EPSON USB client 269 .driver_info = (unsigned long) &epson2888_info, 270 }, 271 #endif 272 273 #ifdef CONFIG_USB_KC2190 274 { 275 USB_DEVICE (0x050f, 0x0190), // KC-190 276 .driver_info = (unsigned long) &kc2190_info, 277 }, 278 #endif 279 280 #ifdef CONFIG_USB_ARMLINUX 281 /* 282 * SA-1100 using standard ARM Linux kernels, or compatible. 283 * Often used when talking to Linux PDAs (iPaq, Yopy, etc). 284 * The sa-1100 "usb-eth" driver handles the basic framing. 285 * 286 * PXA25x or PXA210 ... these use a "usb-eth" driver much like 287 * the sa1100 one, but hardware uses different endpoint numbers. 288 * 289 * Or the Linux "Ethernet" gadget on hardware that can't talk 290 * CDC Ethernet (e.g., no altsettings), in either of two modes: 291 * - acting just like the old "usb-eth" firmware, though 292 * the implementation is different 293 * - supporting RNDIS as the first/default configuration for 294 * MS-Windows interop; Linux needs to use the other config 295 */ 296 { 297 // 1183 = 0x049F, both used as hex values? 298 // Compaq "Itsy" vendor/product id 299 USB_DEVICE (0x049F, 0x505A), // usb-eth, or compatible 300 .driver_info = (unsigned long) &linuxdev_info, 301 }, { 302 USB_DEVICE (0x0E7E, 0x1001), // G.Mate "Yopy" 303 .driver_info = (unsigned long) &yopy_info, 304 }, { 305 USB_DEVICE (0x8086, 0x07d3), // "blob" bootloader 306 .driver_info = (unsigned long) &blob_info, 307 }, { 308 // Linux Ethernet/RNDIS gadget on pxa210/25x/26x, second config 309 // e.g. Gumstix, current OpenZaurus, ... 310 USB_DEVICE_VER (0x0525, 0xa4a2, 0x0203, 0x0203), 311 .driver_info = (unsigned long) &linuxdev_info, 312 }, 313 #endif 314 315 { }, // END 316 }; 317 MODULE_DEVICE_TABLE(usb, products); 318 319 /*-------------------------------------------------------------------------*/ 320 321 static struct usb_driver cdc_subset_driver = { 322 .name = "cdc_subset", 323 .probe = usbnet_probe, 324 .suspend = usbnet_suspend, 325 .resume = usbnet_resume, 326 .disconnect = usbnet_disconnect, 327 .id_table = products, 328 }; 329 330 static int __init cdc_subset_init(void) 331 { 332 return usb_register(&cdc_subset_driver); 333 } 334 module_init(cdc_subset_init); 335 336 static void __exit cdc_subset_exit(void) 337 { 338 usb_deregister(&cdc_subset_driver); 339 } 340 module_exit(cdc_subset_exit); 341 342 MODULE_AUTHOR("David Brownell"); 343 MODULE_DESCRIPTION("Simple 'CDC Subset' USB networking links"); 344 MODULE_LICENSE("GPL"); 345