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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. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
0cf4f2de | 23 | /* #define VERBOSE_DEBUG */ |
1da177e4 | 24 | |
1da177e4 | 25 | #include <linux/kernel.h> |
1da177e4 | 26 | #include <linux/utsname.h> |
1da177e4 | 27 | |
0391c828 | 28 | #include "u_ether.h" |
1da177e4 | 29 | |
1da177e4 LT |
30 | |
31 | /* | |
32 | * Ethernet gadget driver -- with CDC and non-CDC options | |
33 | * Builds on hardware support for a full duplex link. | |
34 | * | |
35 | * CDC Ethernet is the standard USB solution for sending Ethernet frames | |
36 | * using USB. Real hardware tends to use the same framing protocol but look | |
37 | * different for control features. This driver strongly prefers to use | |
38 | * this USB-IF standard as its open-systems interoperability solution; | |
39 | * most host side USB stacks (except from Microsoft) support it. | |
40 | * | |
0391c828 DB |
41 | * This is sometimes called "CDC ECM" (Ethernet Control Model) to support |
42 | * TLA-soup. "CDC ACM" (Abstract Control Model) is for modems, and a new | |
43 | * "CDC EEM" (Ethernet Emulation Model) is starting to spread. | |
44 | * | |
45 | * There's some hardware that can't talk CDC ECM. We make that hardware | |
1da177e4 | 46 | * implement a "minimalist" vendor-agnostic CDC core: same framing, but |
11d54898 DB |
47 | * link-level setup only requires activating the configuration. Only the |
48 | * endpoint descriptors, and product/vendor IDs, are relevant; no control | |
49 | * operations are available. Linux supports it, but other host operating | |
50 | * systems may not. (This is a subset of CDC Ethernet.) | |
51 | * | |
52 | * It turns out that if you add a few descriptors to that "CDC Subset", | |
53 | * (Windows) host side drivers from MCCI can treat it as one submode of | |
54 | * a proprietary scheme called "SAFE" ... without needing to know about | |
55 | * specific product/vendor IDs. So we do that, making it easier to use | |
56 | * those MS-Windows drivers. Those added descriptors make it resemble a | |
57 | * CDC MDLM device, but they don't change device behavior at all. (See | |
58 | * MCCI Engineering report 950198 "SAFE Networking Functions".) | |
1da177e4 LT |
59 | * |
60 | * A third option is also in use. Rather than CDC Ethernet, or something | |
61 | * simpler, Microsoft pushes their own approach: RNDIS. The published | |
62 | * RNDIS specs are ambiguous and appear to be incomplete, and are also | |
0391c828 | 63 | * needlessly complex. They borrow more from CDC ACM than CDC ECM. |
1da177e4 LT |
64 | */ |
65 | ||
66 | #define DRIVER_DESC "Ethernet Gadget" | |
0391c828 | 67 | #define DRIVER_VERSION "Memorial Day 2008" |
1da177e4 | 68 | |
0391c828 DB |
69 | #ifdef CONFIG_USB_ETH_RNDIS |
70 | #define PREFIX "RNDIS/" | |
71 | #else | |
72 | #define PREFIX "" | |
1da177e4 LT |
73 | #endif |
74 | ||
0391c828 DB |
75 | /* |
76 | * This driver aims for interoperability by using CDC ECM unless | |
77 | * | |
78 | * can_support_ecm() | |
1da177e4 | 79 | * |
0391c828 DB |
80 | * returns false, in which case it supports the CDC Subset. By default, |
81 | * that returns true; most hardware has no problems with CDC ECM, that's | |
82 | * a good default. Previous versions of this driver had no default; this | |
83 | * version changes that, removing overhead for new controller support. | |
84 | * | |
85 | * IF YOUR HARDWARE CAN'T SUPPORT CDC ECM, UPDATE THAT ROUTINE! | |
1da177e4 | 86 | */ |
1da177e4 | 87 | |
0391c828 DB |
88 | static inline bool has_rndis(void) |
89 | { | |
90 | #ifdef CONFIG_USB_ETH_RNDIS | |
91 | return true; | |
92 | #else | |
93 | return false; | |
94 | #endif | |
95 | } | |
96 | ||
1da177e4 LT |
97 | /*-------------------------------------------------------------------------*/ |
98 | ||
33376c1c DB |
99 | /* |
100 | * Kbuild is not very cooperative with respect to linking separately | |
101 | * compiled library objects into one module. So for now we won't use | |
102 | * separate compilation ... ensuring init/exit sections work to shrink | |
103 | * the runtime footprint, and giving us at least some parts of what | |
104 | * a "gcc --combine ... part1.c part2.c part3.c ... " build would. | |
105 | */ | |
106 | #include "composite.c" | |
107 | #include "usbstring.c" | |
108 | #include "config.c" | |
109 | #include "epautoconf.c" | |
110 | ||
111 | #include "f_ecm.c" | |
112 | #include "f_subset.c" | |
113 | #ifdef CONFIG_USB_ETH_RNDIS | |
114 | #include "f_rndis.c" | |
115 | #include "rndis.c" | |
116 | #endif | |
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 | ||
1da177e4 LT |
153 | /*-------------------------------------------------------------------------*/ |
154 | ||
0391c828 | 155 | static struct usb_device_descriptor device_desc = { |
1da177e4 LT |
156 | .bLength = sizeof device_desc, |
157 | .bDescriptorType = USB_DT_DEVICE, | |
158 | ||
551509d2 | 159 | .bcdUSB = cpu_to_le16 (0x0200), |
1da177e4 LT |
160 | |
161 | .bDeviceClass = USB_CLASS_COMM, | |
162 | .bDeviceSubClass = 0, | |
163 | .bDeviceProtocol = 0, | |
0391c828 | 164 | /* .bMaxPacketSize0 = f(hardware) */ |
1da177e4 | 165 | |
0391c828 DB |
166 | /* Vendor and product id defaults change according to what configs |
167 | * we support. (As does bNumConfigurations.) These values can | |
168 | * also be overridden by module parameters. | |
169 | */ | |
551509d2 HH |
170 | .idVendor = cpu_to_le16 (CDC_VENDOR_NUM), |
171 | .idProduct = cpu_to_le16 (CDC_PRODUCT_NUM), | |
0391c828 DB |
172 | /* .bcdDevice = f(hardware) */ |
173 | /* .iManufacturer = DYNAMIC */ | |
174 | /* .iProduct = DYNAMIC */ | |
175 | /* NO SERIAL NUMBER */ | |
1da177e4 LT |
176 | .bNumConfigurations = 1, |
177 | }; | |
178 | ||
0391c828 | 179 | static struct usb_otg_descriptor otg_descriptor = { |
1da177e4 LT |
180 | .bLength = sizeof otg_descriptor, |
181 | .bDescriptorType = USB_DT_OTG, | |
182 | ||
0391c828 DB |
183 | /* REVISIT SRP-only hardware is possible, although |
184 | * it would not be called "OTG" ... | |
185 | */ | |
186 | .bmAttributes = USB_OTG_SRP | USB_OTG_HNP, | |
1da177e4 | 187 | }; |
7e27f18c | 188 | |
0391c828 DB |
189 | static const struct usb_descriptor_header *otg_desc[] = { |
190 | (struct usb_descriptor_header *) &otg_descriptor, | |
191 | NULL, | |
1da177e4 | 192 | }; |
1da177e4 | 193 | |
1da177e4 | 194 | |
0391c828 | 195 | /* string IDs are assigned dynamically */ |
1da177e4 | 196 | |
0391c828 DB |
197 | #define STRING_MANUFACTURER_IDX 0 |
198 | #define STRING_PRODUCT_IDX 1 | |
11d54898 | 199 | |
0391c828 | 200 | static char manufacturer[50]; |
1da177e4 | 201 | |
0391c828 DB |
202 | static struct usb_string strings_dev[] = { |
203 | [STRING_MANUFACTURER_IDX].s = manufacturer, | |
204 | [STRING_PRODUCT_IDX].s = PREFIX DRIVER_DESC, | |
205 | { } /* end of list */ | |
1da177e4 LT |
206 | }; |
207 | ||
0391c828 DB |
208 | static struct usb_gadget_strings stringtab_dev = { |
209 | .language = 0x0409, /* en-us */ | |
210 | .strings = strings_dev, | |
1da177e4 LT |
211 | }; |
212 | ||
0391c828 DB |
213 | static struct usb_gadget_strings *dev_strings[] = { |
214 | &stringtab_dev, | |
215 | NULL, | |
1da177e4 LT |
216 | }; |
217 | ||
0391c828 | 218 | static u8 hostaddr[ETH_ALEN]; |
11d54898 | 219 | |
0391c828 | 220 | /*-------------------------------------------------------------------------*/ |
11d54898 | 221 | |
0391c828 DB |
222 | /* |
223 | * We may not have an RNDIS configuration, but if we do it needs to be | |
224 | * the first one present. That's to make Microsoft's drivers happy, | |
225 | * and to follow DOCSIS 1.0 (cable modem standard). | |
11d54898 | 226 | */ |
0391c828 DB |
227 | static int __init rndis_do_config(struct usb_configuration *c) |
228 | { | |
229 | /* FIXME alloc iConfiguration string, set it in c->strings */ | |
11d54898 | 230 | |
0391c828 DB |
231 | if (gadget_is_otg(c->cdev->gadget)) { |
232 | c->descriptors = otg_desc; | |
233 | c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; | |
234 | } | |
1da177e4 | 235 | |
0391c828 DB |
236 | return rndis_bind_config(c, hostaddr); |
237 | } | |
1da177e4 | 238 | |
0391c828 DB |
239 | static struct usb_configuration rndis_config_driver = { |
240 | .label = "RNDIS", | |
241 | .bind = rndis_do_config, | |
242 | .bConfigurationValue = 2, | |
243 | /* .iConfiguration = DYNAMIC */ | |
244 | .bmAttributes = USB_CONFIG_ATT_SELFPOWER, | |
1da177e4 LT |
245 | }; |
246 | ||
0391c828 | 247 | /*-------------------------------------------------------------------------*/ |
1da177e4 | 248 | |
0391c828 DB |
249 | /* |
250 | * We _always_ have an ECM or CDC Subset configuration. | |
1da177e4 | 251 | */ |
0391c828 DB |
252 | static int __init eth_do_config(struct usb_configuration *c) |
253 | { | |
254 | /* FIXME alloc iConfiguration string, set it in c->strings */ | |
7e27f18c | 255 | |
0391c828 DB |
256 | if (gadget_is_otg(c->cdev->gadget)) { |
257 | c->descriptors = otg_desc; | |
258 | c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; | |
259 | } | |
1da177e4 | 260 | |
0391c828 DB |
261 | if (can_support_ecm(c->cdev->gadget)) |
262 | return ecm_bind_config(c, hostaddr); | |
263 | else | |
264 | return geth_bind_config(c, hostaddr); | |
265 | } | |
1da177e4 | 266 | |
0391c828 DB |
267 | static struct usb_configuration eth_config_driver = { |
268 | /* .label = f(hardware) */ | |
269 | .bind = eth_do_config, | |
270 | .bConfigurationValue = 1, | |
271 | /* .iConfiguration = DYNAMIC */ | |
272 | .bmAttributes = USB_CONFIG_ATT_SELFPOWER, | |
1da177e4 LT |
273 | }; |
274 | ||
0391c828 | 275 | /*-------------------------------------------------------------------------*/ |
1da177e4 | 276 | |
0391c828 DB |
277 | static int __init eth_bind(struct usb_composite_dev *cdev) |
278 | { | |
279 | int gcnum; | |
280 | struct usb_gadget *gadget = cdev->gadget; | |
281 | int status; | |
1da177e4 | 282 | |
0391c828 DB |
283 | /* set up network link layer */ |
284 | status = gether_setup(cdev->gadget, hostaddr); | |
285 | if (status < 0) | |
286 | return status; | |
1da177e4 | 287 | |
0391c828 DB |
288 | /* set up main config label and device descriptor */ |
289 | if (can_support_ecm(cdev->gadget)) { | |
290 | /* ECM */ | |
291 | eth_config_driver.label = "CDC Ethernet (ECM)"; | |
292 | } else { | |
293 | /* CDC Subset */ | |
294 | eth_config_driver.label = "CDC Subset/SAFE"; | |
1da177e4 | 295 | |
4e19f220 DB |
296 | device_desc.idVendor = cpu_to_le16(SIMPLE_VENDOR_NUM); |
297 | device_desc.idProduct = cpu_to_le16(SIMPLE_PRODUCT_NUM); | |
298 | if (!has_rndis()) | |
299 | device_desc.bDeviceClass = USB_CLASS_VENDOR_SPEC; | |
0391c828 | 300 | } |
1da177e4 | 301 | |
0391c828 DB |
302 | if (has_rndis()) { |
303 | /* RNDIS plus ECM-or-Subset */ | |
4e19f220 DB |
304 | device_desc.idVendor = cpu_to_le16(RNDIS_VENDOR_NUM); |
305 | device_desc.idProduct = cpu_to_le16(RNDIS_PRODUCT_NUM); | |
0391c828 DB |
306 | device_desc.bNumConfigurations = 2; |
307 | } | |
1da177e4 | 308 | |
0391c828 DB |
309 | gcnum = usb_gadget_controller_number(gadget); |
310 | if (gcnum >= 0) | |
311 | device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum); | |
312 | else { | |
313 | /* We assume that can_support_ecm() tells the truth; | |
314 | * but if the controller isn't recognized at all then | |
315 | * that assumption is a bit more likely to be wrong. | |
316 | */ | |
33376c1c DB |
317 | dev_warn(&gadget->dev, |
318 | "controller '%s' not recognized; trying %s\n", | |
0391c828 DB |
319 | gadget->name, |
320 | eth_config_driver.label); | |
321 | device_desc.bcdDevice = | |
551509d2 | 322 | cpu_to_le16(0x0300 | 0x0099); |
0391c828 | 323 | } |
1da177e4 | 324 | |
1da177e4 | 325 | |
0391c828 DB |
326 | /* Allocate string descriptor numbers ... note that string |
327 | * contents can be overridden by the composite_dev glue. | |
328 | */ | |
1da177e4 | 329 | |
0391c828 DB |
330 | /* device descriptor strings: manufacturer, product */ |
331 | snprintf(manufacturer, sizeof manufacturer, "%s %s with %s", | |
332 | init_utsname()->sysname, init_utsname()->release, | |
333 | gadget->name); | |
334 | status = usb_string_id(cdev); | |
335 | if (status < 0) | |
336 | goto fail; | |
337 | strings_dev[STRING_MANUFACTURER_IDX].id = status; | |
338 | device_desc.iManufacturer = status; | |
1da177e4 | 339 | |
0391c828 DB |
340 | status = usb_string_id(cdev); |
341 | if (status < 0) | |
342 | goto fail; | |
343 | strings_dev[STRING_PRODUCT_IDX].id = status; | |
344 | device_desc.iProduct = status; | |
1da177e4 | 345 | |
0391c828 DB |
346 | /* register our configuration(s); RNDIS first, if it's used */ |
347 | if (has_rndis()) { | |
348 | status = usb_add_config(cdev, &rndis_config_driver); | |
349 | if (status < 0) | |
350 | goto fail; | |
351 | } | |
1da177e4 | 352 | |
0391c828 DB |
353 | status = usb_add_config(cdev, ð_config_driver); |
354 | if (status < 0) | |
355 | goto fail; | |
1da177e4 | 356 | |
33376c1c DB |
357 | dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n", |
358 | DRIVER_DESC); | |
1da177e4 | 359 | |
0391c828 | 360 | return 0; |
1da177e4 | 361 | |
0391c828 DB |
362 | fail: |
363 | gether_cleanup(); | |
364 | return status; | |
365 | } | |
1da177e4 | 366 | |
0391c828 DB |
367 | static int __exit eth_unbind(struct usb_composite_dev *cdev) |
368 | { | |
369 | gether_cleanup(); | |
370 | return 0; | |
371 | } | |
1da177e4 | 372 | |
0391c828 DB |
373 | static struct usb_composite_driver eth_driver = { |
374 | .name = "g_ether", | |
375 | .dev = &device_desc, | |
376 | .strings = dev_strings, | |
377 | .bind = eth_bind, | |
378 | .unbind = __exit_p(eth_unbind), | |
1da177e4 LT |
379 | }; |
380 | ||
0391c828 DB |
381 | MODULE_DESCRIPTION(PREFIX DRIVER_DESC); |
382 | MODULE_AUTHOR("David Brownell, Benedikt Spanger"); | |
383 | MODULE_LICENSE("GPL"); | |
1da177e4 | 384 | |
0391c828 | 385 | static int __init init(void) |
1da177e4 | 386 | { |
0391c828 | 387 | return usb_composite_register(ð_driver); |
1da177e4 | 388 | } |
0391c828 | 389 | module_init(init); |
1da177e4 | 390 | |
0391c828 | 391 | static void __exit cleanup(void) |
1da177e4 | 392 | { |
0391c828 | 393 | usb_composite_unregister(ð_driver); |
1da177e4 | 394 | } |
0391c828 | 395 | module_exit(cleanup); |