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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * ether.c -- Ethernet gadget driver, with CDC and non-CDC options | |
3 | * | |
0391c828 | 4 | * Copyright (C) 2003-2005,2008 David Brownell |
1da177e4 | 5 | * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger |
0391c828 | 6 | * Copyright (C) 2008 Nokia Corporation |
1da177e4 LT |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
1da177e4 LT |
12 | */ |
13 | ||
0cf4f2de | 14 | /* #define VERBOSE_DEBUG */ |
1da177e4 | 15 | |
1da177e4 | 16 | #include <linux/kernel.h> |
1da177e4 | 17 | #include <linux/utsname.h> |
1da177e4 | 18 | |
396cda90 MN |
19 | |
20 | #if defined USB_ETH_RNDIS | |
21 | # undef USB_ETH_RNDIS | |
22 | #endif | |
23 | #ifdef CONFIG_USB_ETH_RNDIS | |
24 | # define USB_ETH_RNDIS y | |
25 | #endif | |
26 | ||
0391c828 | 27 | #include "u_ether.h" |
1da177e4 | 28 | |
1da177e4 LT |
29 | |
30 | /* | |
31 | * Ethernet gadget driver -- with CDC and non-CDC options | |
32 | * Builds on hardware support for a full duplex link. | |
33 | * | |
34 | * CDC Ethernet is the standard USB solution for sending Ethernet frames | |
35 | * using USB. Real hardware tends to use the same framing protocol but look | |
36 | * different for control features. This driver strongly prefers to use | |
37 | * this USB-IF standard as its open-systems interoperability solution; | |
38 | * most host side USB stacks (except from Microsoft) support it. | |
39 | * | |
0391c828 DB |
40 | * This is sometimes called "CDC ECM" (Ethernet Control Model) to support |
41 | * TLA-soup. "CDC ACM" (Abstract Control Model) is for modems, and a new | |
42 | * "CDC EEM" (Ethernet Emulation Model) is starting to spread. | |
43 | * | |
44 | * There's some hardware that can't talk CDC ECM. We make that hardware | |
1da177e4 | 45 | * implement a "minimalist" vendor-agnostic CDC core: same framing, but |
11d54898 DB |
46 | * link-level setup only requires activating the configuration. Only the |
47 | * endpoint descriptors, and product/vendor IDs, are relevant; no control | |
48 | * operations are available. Linux supports it, but other host operating | |
49 | * systems may not. (This is a subset of CDC Ethernet.) | |
50 | * | |
51 | * It turns out that if you add a few descriptors to that "CDC Subset", | |
52 | * (Windows) host side drivers from MCCI can treat it as one submode of | |
53 | * a proprietary scheme called "SAFE" ... without needing to know about | |
54 | * specific product/vendor IDs. So we do that, making it easier to use | |
55 | * those MS-Windows drivers. Those added descriptors make it resemble a | |
56 | * CDC MDLM device, but they don't change device behavior at all. (See | |
57 | * MCCI Engineering report 950198 "SAFE Networking Functions".) | |
1da177e4 LT |
58 | * |
59 | * A third option is also in use. Rather than CDC Ethernet, or something | |
60 | * simpler, Microsoft pushes their own approach: RNDIS. The published | |
61 | * RNDIS specs are ambiguous and appear to be incomplete, and are also | |
0391c828 | 62 | * needlessly complex. They borrow more from CDC ACM than CDC ECM. |
1da177e4 LT |
63 | */ |
64 | ||
65 | #define DRIVER_DESC "Ethernet Gadget" | |
0391c828 | 66 | #define DRIVER_VERSION "Memorial Day 2008" |
1da177e4 | 67 | |
396cda90 | 68 | #ifdef USB_ETH_RNDIS |
0391c828 DB |
69 | #define PREFIX "RNDIS/" |
70 | #else | |
71 | #define PREFIX "" | |
1da177e4 LT |
72 | #endif |
73 | ||
0391c828 DB |
74 | /* |
75 | * This driver aims for interoperability by using CDC ECM unless | |
76 | * | |
77 | * can_support_ecm() | |
1da177e4 | 78 | * |
0391c828 DB |
79 | * returns false, in which case it supports the CDC Subset. By default, |
80 | * that returns true; most hardware has no problems with CDC ECM, that's | |
81 | * a good default. Previous versions of this driver had no default; this | |
82 | * version changes that, removing overhead for new controller support. | |
83 | * | |
84 | * IF YOUR HARDWARE CAN'T SUPPORT CDC ECM, UPDATE THAT ROUTINE! | |
1da177e4 | 85 | */ |
1da177e4 | 86 | |
0391c828 DB |
87 | static inline bool has_rndis(void) |
88 | { | |
396cda90 | 89 | #ifdef USB_ETH_RNDIS |
0391c828 DB |
90 | return true; |
91 | #else | |
92 | return false; | |
93 | #endif | |
94 | } | |
95 | ||
1da177e4 LT |
96 | /*-------------------------------------------------------------------------*/ |
97 | ||
33376c1c DB |
98 | /* |
99 | * Kbuild is not very cooperative with respect to linking separately | |
100 | * compiled library objects into one module. So for now we won't use | |
101 | * separate compilation ... ensuring init/exit sections work to shrink | |
102 | * the runtime footprint, and giving us at least some parts of what | |
103 | * a "gcc --combine ... part1.c part2.c part3.c ... " build would. | |
104 | */ | |
105 | #include "composite.c" | |
106 | #include "usbstring.c" | |
107 | #include "config.c" | |
108 | #include "epautoconf.c" | |
109 | ||
110 | #include "f_ecm.c" | |
111 | #include "f_subset.c" | |
396cda90 | 112 | #ifdef USB_ETH_RNDIS |
33376c1c DB |
113 | #include "f_rndis.c" |
114 | #include "rndis.c" | |
115 | #endif | |
9b39e9dd | 116 | #include "f_eem.c" |
33376c1c DB |
117 | #include "u_ether.c" |
118 | ||
119 | /*-------------------------------------------------------------------------*/ | |
120 | ||
1da177e4 LT |
121 | /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! |
122 | * Instead: allocate your own, using normal USB-IF procedures. | |
123 | */ | |
124 | ||
125 | /* Thanks to NetChip Technologies for donating this product ID. | |
126 | * It's for devices with only CDC Ethernet configurations. | |
127 | */ | |
0391c828 DB |
128 | #define CDC_VENDOR_NUM 0x0525 /* NetChip */ |
129 | #define CDC_PRODUCT_NUM 0xa4a1 /* Linux-USB Ethernet Gadget */ | |
1da177e4 LT |
130 | |
131 | /* For hardware that can't talk CDC, we use the same vendor ID that | |
132 | * ARM Linux has used for ethernet-over-usb, both with sa1100 and | |
133 | * with pxa250. We're protocol-compatible, if the host-side drivers | |
134 | * use the endpoint descriptors. bcdDevice (version) is nonzero, so | |
135 | * drivers that need to hard-wire endpoint numbers have a hook. | |
136 | * | |
137 | * The protocol is a minimal subset of CDC Ether, which works on any bulk | |
138 | * hardware that's not deeply broken ... even on hardware that can't talk | |
139 | * RNDIS (like SA-1100, with no interrupt endpoint, or anything that | |
140 | * doesn't handle control-OUT). | |
141 | */ | |
142 | #define SIMPLE_VENDOR_NUM 0x049f | |
143 | #define SIMPLE_PRODUCT_NUM 0x505a | |
144 | ||
145 | /* For hardware that can talk RNDIS and either of the above protocols, | |
146 | * use this ID ... the windows INF files will know it. Unless it's | |
147 | * used with CDC Ethernet, Linux 2.4 hosts will need updates to choose | |
148 | * the non-RNDIS configuration. | |
149 | */ | |
150 | #define RNDIS_VENDOR_NUM 0x0525 /* NetChip */ | |
151 | #define RNDIS_PRODUCT_NUM 0xa4a2 /* Ethernet/RNDIS Gadget */ | |
152 | ||
9b39e9dd | 153 | /* For EEM gadgets */ |
4238ef54 BN |
154 | #define EEM_VENDOR_NUM 0x1d6b /* Linux Foundation */ |
155 | #define EEM_PRODUCT_NUM 0x0102 /* EEM Gadget */ | |
9b39e9dd | 156 | |
1da177e4 LT |
157 | /*-------------------------------------------------------------------------*/ |
158 | ||
0391c828 | 159 | static struct usb_device_descriptor device_desc = { |
1da177e4 LT |
160 | .bLength = sizeof device_desc, |
161 | .bDescriptorType = USB_DT_DEVICE, | |
162 | ||
551509d2 | 163 | .bcdUSB = cpu_to_le16 (0x0200), |
1da177e4 LT |
164 | |
165 | .bDeviceClass = USB_CLASS_COMM, | |
166 | .bDeviceSubClass = 0, | |
167 | .bDeviceProtocol = 0, | |
0391c828 | 168 | /* .bMaxPacketSize0 = f(hardware) */ |
1da177e4 | 169 | |
0391c828 DB |
170 | /* Vendor and product id defaults change according to what configs |
171 | * we support. (As does bNumConfigurations.) These values can | |
172 | * also be overridden by module parameters. | |
173 | */ | |
551509d2 HH |
174 | .idVendor = cpu_to_le16 (CDC_VENDOR_NUM), |
175 | .idProduct = cpu_to_le16 (CDC_PRODUCT_NUM), | |
0391c828 DB |
176 | /* .bcdDevice = f(hardware) */ |
177 | /* .iManufacturer = DYNAMIC */ | |
178 | /* .iProduct = DYNAMIC */ | |
179 | /* NO SERIAL NUMBER */ | |
1da177e4 LT |
180 | .bNumConfigurations = 1, |
181 | }; | |
182 | ||
0391c828 | 183 | static struct usb_otg_descriptor otg_descriptor = { |
1da177e4 LT |
184 | .bLength = sizeof otg_descriptor, |
185 | .bDescriptorType = USB_DT_OTG, | |
186 | ||
0391c828 DB |
187 | /* REVISIT SRP-only hardware is possible, although |
188 | * it would not be called "OTG" ... | |
189 | */ | |
190 | .bmAttributes = USB_OTG_SRP | USB_OTG_HNP, | |
1da177e4 | 191 | }; |
7e27f18c | 192 | |
0391c828 DB |
193 | static const struct usb_descriptor_header *otg_desc[] = { |
194 | (struct usb_descriptor_header *) &otg_descriptor, | |
195 | NULL, | |
1da177e4 | 196 | }; |
1da177e4 | 197 | |
1da177e4 | 198 | |
0391c828 | 199 | /* string IDs are assigned dynamically */ |
1da177e4 | 200 | |
0391c828 DB |
201 | #define STRING_MANUFACTURER_IDX 0 |
202 | #define STRING_PRODUCT_IDX 1 | |
11d54898 | 203 | |
0391c828 | 204 | static char manufacturer[50]; |
1da177e4 | 205 | |
0391c828 DB |
206 | static struct usb_string strings_dev[] = { |
207 | [STRING_MANUFACTURER_IDX].s = manufacturer, | |
208 | [STRING_PRODUCT_IDX].s = PREFIX DRIVER_DESC, | |
209 | { } /* end of list */ | |
1da177e4 LT |
210 | }; |
211 | ||
0391c828 DB |
212 | static struct usb_gadget_strings stringtab_dev = { |
213 | .language = 0x0409, /* en-us */ | |
214 | .strings = strings_dev, | |
1da177e4 LT |
215 | }; |
216 | ||
0391c828 DB |
217 | static struct usb_gadget_strings *dev_strings[] = { |
218 | &stringtab_dev, | |
219 | NULL, | |
1da177e4 LT |
220 | }; |
221 | ||
0391c828 | 222 | static u8 hostaddr[ETH_ALEN]; |
11d54898 | 223 | |
0391c828 | 224 | /*-------------------------------------------------------------------------*/ |
11d54898 | 225 | |
0391c828 DB |
226 | /* |
227 | * We may not have an RNDIS configuration, but if we do it needs to be | |
228 | * the first one present. That's to make Microsoft's drivers happy, | |
229 | * and to follow DOCSIS 1.0 (cable modem standard). | |
11d54898 | 230 | */ |
e12995ec | 231 | static int __init rndis_do_config(struct usb_configuration *c) |
0391c828 DB |
232 | { |
233 | /* FIXME alloc iConfiguration string, set it in c->strings */ | |
11d54898 | 234 | |
0391c828 DB |
235 | if (gadget_is_otg(c->cdev->gadget)) { |
236 | c->descriptors = otg_desc; | |
237 | c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; | |
238 | } | |
1da177e4 | 239 | |
0391c828 DB |
240 | return rndis_bind_config(c, hostaddr); |
241 | } | |
1da177e4 | 242 | |
0391c828 DB |
243 | static struct usb_configuration rndis_config_driver = { |
244 | .label = "RNDIS", | |
0391c828 DB |
245 | .bConfigurationValue = 2, |
246 | /* .iConfiguration = DYNAMIC */ | |
247 | .bmAttributes = USB_CONFIG_ATT_SELFPOWER, | |
1da177e4 LT |
248 | }; |
249 | ||
0391c828 | 250 | /*-------------------------------------------------------------------------*/ |
1da177e4 | 251 | |
c9188ad2 | 252 | #ifdef CONFIG_USB_ETH_EEM |
9b39e9dd BN |
253 | static int use_eem = 1; |
254 | #else | |
255 | static int use_eem; | |
256 | #endif | |
257 | module_param(use_eem, bool, 0); | |
258 | MODULE_PARM_DESC(use_eem, "use CDC EEM mode"); | |
259 | ||
0391c828 | 260 | /* |
9b39e9dd | 261 | * We _always_ have an ECM, CDC Subset, or EEM configuration. |
1da177e4 | 262 | */ |
e12995ec | 263 | static int __init eth_do_config(struct usb_configuration *c) |
0391c828 DB |
264 | { |
265 | /* FIXME alloc iConfiguration string, set it in c->strings */ | |
7e27f18c | 266 | |
0391c828 DB |
267 | if (gadget_is_otg(c->cdev->gadget)) { |
268 | c->descriptors = otg_desc; | |
269 | c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; | |
270 | } | |
1da177e4 | 271 | |
9b39e9dd BN |
272 | if (use_eem) |
273 | return eem_bind_config(c); | |
274 | else if (can_support_ecm(c->cdev->gadget)) | |
0391c828 DB |
275 | return ecm_bind_config(c, hostaddr); |
276 | else | |
277 | return geth_bind_config(c, hostaddr); | |
278 | } | |
1da177e4 | 279 | |
0391c828 DB |
280 | static struct usb_configuration eth_config_driver = { |
281 | /* .label = f(hardware) */ | |
0391c828 DB |
282 | .bConfigurationValue = 1, |
283 | /* .iConfiguration = DYNAMIC */ | |
284 | .bmAttributes = USB_CONFIG_ATT_SELFPOWER, | |
1da177e4 LT |
285 | }; |
286 | ||
0391c828 | 287 | /*-------------------------------------------------------------------------*/ |
1da177e4 | 288 | |
e12995ec | 289 | static int __init eth_bind(struct usb_composite_dev *cdev) |
0391c828 DB |
290 | { |
291 | int gcnum; | |
292 | struct usb_gadget *gadget = cdev->gadget; | |
293 | int status; | |
1da177e4 | 294 | |
0391c828 DB |
295 | /* set up network link layer */ |
296 | status = gether_setup(cdev->gadget, hostaddr); | |
297 | if (status < 0) | |
298 | return status; | |
1da177e4 | 299 | |
0391c828 | 300 | /* set up main config label and device descriptor */ |
9b39e9dd BN |
301 | if (use_eem) { |
302 | /* EEM */ | |
303 | eth_config_driver.label = "CDC Ethernet (EEM)"; | |
304 | device_desc.idVendor = cpu_to_le16(EEM_VENDOR_NUM); | |
305 | device_desc.idProduct = cpu_to_le16(EEM_PRODUCT_NUM); | |
306 | } else if (can_support_ecm(cdev->gadget)) { | |
0391c828 DB |
307 | /* ECM */ |
308 | eth_config_driver.label = "CDC Ethernet (ECM)"; | |
309 | } else { | |
310 | /* CDC Subset */ | |
311 | eth_config_driver.label = "CDC Subset/SAFE"; | |
1da177e4 | 312 | |
4e19f220 DB |
313 | device_desc.idVendor = cpu_to_le16(SIMPLE_VENDOR_NUM); |
314 | device_desc.idProduct = cpu_to_le16(SIMPLE_PRODUCT_NUM); | |
315 | if (!has_rndis()) | |
316 | device_desc.bDeviceClass = USB_CLASS_VENDOR_SPEC; | |
0391c828 | 317 | } |
1da177e4 | 318 | |
0391c828 DB |
319 | if (has_rndis()) { |
320 | /* RNDIS plus ECM-or-Subset */ | |
4e19f220 DB |
321 | device_desc.idVendor = cpu_to_le16(RNDIS_VENDOR_NUM); |
322 | device_desc.idProduct = cpu_to_le16(RNDIS_PRODUCT_NUM); | |
0391c828 DB |
323 | device_desc.bNumConfigurations = 2; |
324 | } | |
1da177e4 | 325 | |
0391c828 DB |
326 | gcnum = usb_gadget_controller_number(gadget); |
327 | if (gcnum >= 0) | |
328 | device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum); | |
329 | else { | |
330 | /* We assume that can_support_ecm() tells the truth; | |
331 | * but if the controller isn't recognized at all then | |
332 | * that assumption is a bit more likely to be wrong. | |
333 | */ | |
33376c1c DB |
334 | dev_warn(&gadget->dev, |
335 | "controller '%s' not recognized; trying %s\n", | |
0391c828 DB |
336 | gadget->name, |
337 | eth_config_driver.label); | |
338 | device_desc.bcdDevice = | |
551509d2 | 339 | cpu_to_le16(0x0300 | 0x0099); |
0391c828 | 340 | } |
1da177e4 | 341 | |
1da177e4 | 342 | |
0391c828 DB |
343 | /* Allocate string descriptor numbers ... note that string |
344 | * contents can be overridden by the composite_dev glue. | |
345 | */ | |
1da177e4 | 346 | |
0391c828 DB |
347 | /* device descriptor strings: manufacturer, product */ |
348 | snprintf(manufacturer, sizeof manufacturer, "%s %s with %s", | |
349 | init_utsname()->sysname, init_utsname()->release, | |
350 | gadget->name); | |
351 | status = usb_string_id(cdev); | |
352 | if (status < 0) | |
353 | goto fail; | |
354 | strings_dev[STRING_MANUFACTURER_IDX].id = status; | |
355 | device_desc.iManufacturer = status; | |
1da177e4 | 356 | |
0391c828 DB |
357 | status = usb_string_id(cdev); |
358 | if (status < 0) | |
359 | goto fail; | |
360 | strings_dev[STRING_PRODUCT_IDX].id = status; | |
361 | device_desc.iProduct = status; | |
1da177e4 | 362 | |
0391c828 DB |
363 | /* register our configuration(s); RNDIS first, if it's used */ |
364 | if (has_rndis()) { | |
c9bfff9c UKK |
365 | status = usb_add_config(cdev, &rndis_config_driver, |
366 | rndis_do_config); | |
0391c828 DB |
367 | if (status < 0) |
368 | goto fail; | |
369 | } | |
1da177e4 | 370 | |
c9bfff9c | 371 | status = usb_add_config(cdev, ð_config_driver, eth_do_config); |
0391c828 DB |
372 | if (status < 0) |
373 | goto fail; | |
1da177e4 | 374 | |
33376c1c DB |
375 | dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n", |
376 | DRIVER_DESC); | |
1da177e4 | 377 | |
0391c828 | 378 | return 0; |
1da177e4 | 379 | |
0391c828 DB |
380 | fail: |
381 | gether_cleanup(); | |
382 | return status; | |
383 | } | |
1da177e4 | 384 | |
0391c828 DB |
385 | static int __exit eth_unbind(struct usb_composite_dev *cdev) |
386 | { | |
387 | gether_cleanup(); | |
388 | return 0; | |
389 | } | |
1da177e4 | 390 | |
0391c828 DB |
391 | static struct usb_composite_driver eth_driver = { |
392 | .name = "g_ether", | |
393 | .dev = &device_desc, | |
394 | .strings = dev_strings, | |
04617db7 | 395 | .max_speed = USB_SPEED_SUPER, |
0391c828 | 396 | .unbind = __exit_p(eth_unbind), |
1da177e4 LT |
397 | }; |
398 | ||
0391c828 DB |
399 | MODULE_DESCRIPTION(PREFIX DRIVER_DESC); |
400 | MODULE_AUTHOR("David Brownell, Benedikt Spanger"); | |
401 | MODULE_LICENSE("GPL"); | |
1da177e4 | 402 | |
0391c828 | 403 | static int __init init(void) |
1da177e4 | 404 | { |
07a18bd7 | 405 | return usb_composite_probe(ð_driver, eth_bind); |
1da177e4 | 406 | } |
0391c828 | 407 | module_init(init); |
1da177e4 | 408 | |
0391c828 | 409 | static void __exit cleanup(void) |
1da177e4 | 410 | { |
0391c828 | 411 | usb_composite_unregister(ð_driver); |
1da177e4 | 412 | } |
0391c828 | 413 | module_exit(cleanup); |