Commit | Line | Data |
---|---|---|
45fe3b8e DB |
1 | /* |
2 | * f_rndis.c -- RNDIS link function driver | |
3 | * | |
4 | * Copyright (C) 2003-2005,2008 David Brownell | |
5 | * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger | |
6 | * Copyright (C) 2008 Nokia Corporation | |
b97503ff | 7 | * Copyright (C) 2009 Samsung Electronics |
54b8360f | 8 | * Author: Michal Nazarewicz (mina86@mina86.com) |
45fe3b8e DB |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
45fe3b8e DB |
14 | */ |
15 | ||
16 | /* #define VERBOSE_DEBUG */ | |
17 | ||
5a0e3ad6 | 18 | #include <linux/slab.h> |
45fe3b8e | 19 | #include <linux/kernel.h> |
f466c635 | 20 | #include <linux/module.h> |
45fe3b8e DB |
21 | #include <linux/device.h> |
22 | #include <linux/etherdevice.h> | |
23 | ||
60063497 | 24 | #include <linux/atomic.h> |
45fe3b8e DB |
25 | |
26 | #include "u_ether.h" | |
b3df2faa | 27 | #include "u_ether_configfs.h" |
f466c635 | 28 | #include "u_rndis.h" |
45fe3b8e DB |
29 | #include "rndis.h" |
30 | ||
45fe3b8e DB |
31 | /* |
32 | * This function is an RNDIS Ethernet port -- a Microsoft protocol that's | |
33 | * been promoted instead of the standard CDC Ethernet. The published RNDIS | |
34 | * spec is ambiguous, incomplete, and needlessly complex. Variants such as | |
35 | * ActiveSync have even worse status in terms of specification. | |
36 | * | |
37 | * In short: it's a protocol controlled by (and for) Microsoft, not for an | |
38 | * Open ecosystem or markets. Linux supports it *only* because Microsoft | |
39 | * doesn't support the CDC Ethernet standard. | |
40 | * | |
41 | * The RNDIS data transfer model is complex, with multiple Ethernet packets | |
42 | * per USB message, and out of band data. The control model is built around | |
43 | * what's essentially an "RNDIS RPC" protocol. It's all wrapped in a CDC ACM | |
44 | * (modem, not Ethernet) veneer, with those ACM descriptors being entirely | |
45 | * useless (they're ignored). RNDIS expects to be the only function in its | |
46 | * configuration, so it's no real help if you need composite devices; and | |
47 | * it expects to be the first configuration too. | |
48 | * | |
49 | * There is a single technical advantage of RNDIS over CDC Ethernet, if you | |
50 | * discount the fluff that its RPC can be made to deliver: it doesn't need | |
51 | * a NOP altsetting for the data interface. That lets it work on some of the | |
52 | * "so smart it's stupid" hardware which takes over configuration changes | |
53 | * from the software, and adds restrictions like "no altsettings". | |
54 | * | |
55 | * Unfortunately MSFT's RNDIS drivers are buggy. They hang or oops, and | |
56 | * have all sorts of contrary-to-specification oddities that can prevent | |
57 | * them from working sanely. Since bugfixes (or accurate specs, letting | |
58 | * Linux work around those bugs) are unlikely to ever come from MSFT, you | |
59 | * may want to avoid using RNDIS on purely operational grounds. | |
60 | * | |
61 | * Omissions from the RNDIS 1.0 specification include: | |
62 | * | |
63 | * - Power management ... references data that's scattered around lots | |
64 | * of other documentation, which is incorrect/incomplete there too. | |
65 | * | |
66 | * - There are various undocumented protocol requirements, like the need | |
67 | * to send garbage in some control-OUT messages. | |
68 | * | |
69 | * - MS-Windows drivers sometimes emit undocumented requests. | |
70 | */ | |
71 | ||
45fe3b8e DB |
72 | struct f_rndis { |
73 | struct gether port; | |
74 | u8 ctrl_id, data_id; | |
75 | u8 ethaddr[ETH_ALEN]; | |
1fbfeff9 BG |
76 | u32 vendorID; |
77 | const char *manufacturer; | |
45fe3b8e DB |
78 | int config; |
79 | ||
45fe3b8e | 80 | struct usb_ep *notify; |
45fe3b8e DB |
81 | struct usb_request *notify_req; |
82 | atomic_t notify_count; | |
83 | }; | |
84 | ||
85 | static inline struct f_rndis *func_to_rndis(struct usb_function *f) | |
86 | { | |
87 | return container_of(f, struct f_rndis, port.func); | |
88 | } | |
89 | ||
90 | /* peak (theoretical) bulk transfer rate in bits-per-second */ | |
91 | static unsigned int bitrate(struct usb_gadget *g) | |
92 | { | |
04617db7 PZ |
93 | if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER) |
94 | return 13 * 1024 * 8 * 1000 * 8; | |
95 | else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) | |
45fe3b8e DB |
96 | return 13 * 512 * 8 * 1000 * 8; |
97 | else | |
04617db7 | 98 | return 19 * 64 * 1 * 1000 * 8; |
45fe3b8e DB |
99 | } |
100 | ||
101 | /*-------------------------------------------------------------------------*/ | |
102 | ||
103 | /* | |
104 | */ | |
105 | ||
bcb2f99c | 106 | #define RNDIS_STATUS_INTERVAL_MS 32 |
45fe3b8e DB |
107 | #define STATUS_BYTECOUNT 8 /* 8 bytes data */ |
108 | ||
109 | ||
110 | /* interface descriptor: */ | |
111 | ||
28824b18 | 112 | static struct usb_interface_descriptor rndis_control_intf = { |
45fe3b8e DB |
113 | .bLength = sizeof rndis_control_intf, |
114 | .bDescriptorType = USB_DT_INTERFACE, | |
115 | ||
116 | /* .bInterfaceNumber = DYNAMIC */ | |
117 | /* status endpoint is optional; this could be patched later */ | |
118 | .bNumEndpoints = 1, | |
119 | .bInterfaceClass = USB_CLASS_COMM, | |
120 | .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM, | |
121 | .bInterfaceProtocol = USB_CDC_ACM_PROTO_VENDOR, | |
122 | /* .iInterface = DYNAMIC */ | |
123 | }; | |
124 | ||
28824b18 | 125 | static struct usb_cdc_header_desc header_desc = { |
45fe3b8e DB |
126 | .bLength = sizeof header_desc, |
127 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
128 | .bDescriptorSubType = USB_CDC_HEADER_TYPE, | |
129 | ||
551509d2 | 130 | .bcdCDC = cpu_to_le16(0x0110), |
45fe3b8e DB |
131 | }; |
132 | ||
28824b18 | 133 | static struct usb_cdc_call_mgmt_descriptor call_mgmt_descriptor = { |
45fe3b8e DB |
134 | .bLength = sizeof call_mgmt_descriptor, |
135 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
136 | .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE, | |
137 | ||
138 | .bmCapabilities = 0x00, | |
139 | .bDataInterface = 0x01, | |
140 | }; | |
141 | ||
28824b18 | 142 | static struct usb_cdc_acm_descriptor rndis_acm_descriptor = { |
b97503ff | 143 | .bLength = sizeof rndis_acm_descriptor, |
45fe3b8e DB |
144 | .bDescriptorType = USB_DT_CS_INTERFACE, |
145 | .bDescriptorSubType = USB_CDC_ACM_TYPE, | |
146 | ||
147 | .bmCapabilities = 0x00, | |
148 | }; | |
149 | ||
28824b18 | 150 | static struct usb_cdc_union_desc rndis_union_desc = { |
45fe3b8e DB |
151 | .bLength = sizeof(rndis_union_desc), |
152 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
153 | .bDescriptorSubType = USB_CDC_UNION_TYPE, | |
154 | /* .bMasterInterface0 = DYNAMIC */ | |
155 | /* .bSlaveInterface0 = DYNAMIC */ | |
156 | }; | |
157 | ||
158 | /* the data interface has two bulk endpoints */ | |
159 | ||
28824b18 | 160 | static struct usb_interface_descriptor rndis_data_intf = { |
45fe3b8e DB |
161 | .bLength = sizeof rndis_data_intf, |
162 | .bDescriptorType = USB_DT_INTERFACE, | |
163 | ||
164 | /* .bInterfaceNumber = DYNAMIC */ | |
45fe3b8e DB |
165 | .bNumEndpoints = 2, |
166 | .bInterfaceClass = USB_CLASS_CDC_DATA, | |
167 | .bInterfaceSubClass = 0, | |
168 | .bInterfaceProtocol = 0, | |
169 | /* .iInterface = DYNAMIC */ | |
170 | }; | |
171 | ||
b97503ff MN |
172 | |
173 | static struct usb_interface_assoc_descriptor | |
174 | rndis_iad_descriptor = { | |
175 | .bLength = sizeof rndis_iad_descriptor, | |
176 | .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, | |
177 | ||
178 | .bFirstInterface = 0, /* XXX, hardcoded */ | |
179 | .bInterfaceCount = 2, // control + data | |
180 | .bFunctionClass = USB_CLASS_COMM, | |
181 | .bFunctionSubClass = USB_CDC_SUBCLASS_ETHERNET, | |
182 | .bFunctionProtocol = USB_CDC_PROTO_NONE, | |
183 | /* .iFunction = DYNAMIC */ | |
184 | }; | |
185 | ||
45fe3b8e DB |
186 | /* full speed support: */ |
187 | ||
28824b18 | 188 | static struct usb_endpoint_descriptor fs_notify_desc = { |
45fe3b8e DB |
189 | .bLength = USB_DT_ENDPOINT_SIZE, |
190 | .bDescriptorType = USB_DT_ENDPOINT, | |
191 | ||
192 | .bEndpointAddress = USB_DIR_IN, | |
193 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
551509d2 | 194 | .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT), |
bcb2f99c | 195 | .bInterval = RNDIS_STATUS_INTERVAL_MS, |
45fe3b8e DB |
196 | }; |
197 | ||
28824b18 | 198 | static struct usb_endpoint_descriptor fs_in_desc = { |
45fe3b8e DB |
199 | .bLength = USB_DT_ENDPOINT_SIZE, |
200 | .bDescriptorType = USB_DT_ENDPOINT, | |
201 | ||
202 | .bEndpointAddress = USB_DIR_IN, | |
203 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
204 | }; | |
205 | ||
28824b18 | 206 | static struct usb_endpoint_descriptor fs_out_desc = { |
45fe3b8e DB |
207 | .bLength = USB_DT_ENDPOINT_SIZE, |
208 | .bDescriptorType = USB_DT_ENDPOINT, | |
209 | ||
210 | .bEndpointAddress = USB_DIR_OUT, | |
211 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
212 | }; | |
213 | ||
28824b18 | 214 | static struct usb_descriptor_header *eth_fs_function[] = { |
b97503ff | 215 | (struct usb_descriptor_header *) &rndis_iad_descriptor, |
04617db7 | 216 | |
45fe3b8e DB |
217 | /* control interface matches ACM, not Ethernet */ |
218 | (struct usb_descriptor_header *) &rndis_control_intf, | |
219 | (struct usb_descriptor_header *) &header_desc, | |
220 | (struct usb_descriptor_header *) &call_mgmt_descriptor, | |
b97503ff | 221 | (struct usb_descriptor_header *) &rndis_acm_descriptor, |
45fe3b8e DB |
222 | (struct usb_descriptor_header *) &rndis_union_desc, |
223 | (struct usb_descriptor_header *) &fs_notify_desc, | |
04617db7 | 224 | |
45fe3b8e DB |
225 | /* data interface has no altsetting */ |
226 | (struct usb_descriptor_header *) &rndis_data_intf, | |
227 | (struct usb_descriptor_header *) &fs_in_desc, | |
228 | (struct usb_descriptor_header *) &fs_out_desc, | |
229 | NULL, | |
230 | }; | |
231 | ||
232 | /* high speed support: */ | |
233 | ||
28824b18 | 234 | static struct usb_endpoint_descriptor hs_notify_desc = { |
45fe3b8e DB |
235 | .bLength = USB_DT_ENDPOINT_SIZE, |
236 | .bDescriptorType = USB_DT_ENDPOINT, | |
237 | ||
238 | .bEndpointAddress = USB_DIR_IN, | |
239 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
551509d2 | 240 | .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT), |
bcb2f99c | 241 | .bInterval = USB_MS_TO_HS_INTERVAL(RNDIS_STATUS_INTERVAL_MS) |
45fe3b8e | 242 | }; |
04617db7 | 243 | |
28824b18 | 244 | static struct usb_endpoint_descriptor hs_in_desc = { |
45fe3b8e DB |
245 | .bLength = USB_DT_ENDPOINT_SIZE, |
246 | .bDescriptorType = USB_DT_ENDPOINT, | |
247 | ||
248 | .bEndpointAddress = USB_DIR_IN, | |
249 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 250 | .wMaxPacketSize = cpu_to_le16(512), |
45fe3b8e DB |
251 | }; |
252 | ||
28824b18 | 253 | static struct usb_endpoint_descriptor hs_out_desc = { |
45fe3b8e DB |
254 | .bLength = USB_DT_ENDPOINT_SIZE, |
255 | .bDescriptorType = USB_DT_ENDPOINT, | |
256 | ||
257 | .bEndpointAddress = USB_DIR_OUT, | |
258 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 259 | .wMaxPacketSize = cpu_to_le16(512), |
45fe3b8e DB |
260 | }; |
261 | ||
28824b18 | 262 | static struct usb_descriptor_header *eth_hs_function[] = { |
b97503ff | 263 | (struct usb_descriptor_header *) &rndis_iad_descriptor, |
04617db7 | 264 | |
45fe3b8e DB |
265 | /* control interface matches ACM, not Ethernet */ |
266 | (struct usb_descriptor_header *) &rndis_control_intf, | |
267 | (struct usb_descriptor_header *) &header_desc, | |
268 | (struct usb_descriptor_header *) &call_mgmt_descriptor, | |
b97503ff | 269 | (struct usb_descriptor_header *) &rndis_acm_descriptor, |
45fe3b8e DB |
270 | (struct usb_descriptor_header *) &rndis_union_desc, |
271 | (struct usb_descriptor_header *) &hs_notify_desc, | |
04617db7 | 272 | |
45fe3b8e DB |
273 | /* data interface has no altsetting */ |
274 | (struct usb_descriptor_header *) &rndis_data_intf, | |
275 | (struct usb_descriptor_header *) &hs_in_desc, | |
276 | (struct usb_descriptor_header *) &hs_out_desc, | |
277 | NULL, | |
278 | }; | |
279 | ||
04617db7 PZ |
280 | /* super speed support: */ |
281 | ||
282 | static struct usb_endpoint_descriptor ss_notify_desc = { | |
283 | .bLength = USB_DT_ENDPOINT_SIZE, | |
284 | .bDescriptorType = USB_DT_ENDPOINT, | |
285 | ||
286 | .bEndpointAddress = USB_DIR_IN, | |
287 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
288 | .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT), | |
bcb2f99c | 289 | .bInterval = USB_MS_TO_HS_INTERVAL(RNDIS_STATUS_INTERVAL_MS) |
04617db7 PZ |
290 | }; |
291 | ||
292 | static struct usb_ss_ep_comp_descriptor ss_intr_comp_desc = { | |
293 | .bLength = sizeof ss_intr_comp_desc, | |
294 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
295 | ||
296 | /* the following 3 values can be tweaked if necessary */ | |
297 | /* .bMaxBurst = 0, */ | |
298 | /* .bmAttributes = 0, */ | |
299 | .wBytesPerInterval = cpu_to_le16(STATUS_BYTECOUNT), | |
300 | }; | |
301 | ||
302 | static struct usb_endpoint_descriptor ss_in_desc = { | |
303 | .bLength = USB_DT_ENDPOINT_SIZE, | |
304 | .bDescriptorType = USB_DT_ENDPOINT, | |
305 | ||
306 | .bEndpointAddress = USB_DIR_IN, | |
307 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
308 | .wMaxPacketSize = cpu_to_le16(1024), | |
309 | }; | |
310 | ||
311 | static struct usb_endpoint_descriptor ss_out_desc = { | |
312 | .bLength = USB_DT_ENDPOINT_SIZE, | |
313 | .bDescriptorType = USB_DT_ENDPOINT, | |
314 | ||
315 | .bEndpointAddress = USB_DIR_OUT, | |
316 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
317 | .wMaxPacketSize = cpu_to_le16(1024), | |
318 | }; | |
319 | ||
320 | static struct usb_ss_ep_comp_descriptor ss_bulk_comp_desc = { | |
321 | .bLength = sizeof ss_bulk_comp_desc, | |
322 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
323 | ||
324 | /* the following 2 values can be tweaked if necessary */ | |
325 | /* .bMaxBurst = 0, */ | |
326 | /* .bmAttributes = 0, */ | |
327 | }; | |
328 | ||
329 | static struct usb_descriptor_header *eth_ss_function[] = { | |
330 | (struct usb_descriptor_header *) &rndis_iad_descriptor, | |
331 | ||
332 | /* control interface matches ACM, not Ethernet */ | |
333 | (struct usb_descriptor_header *) &rndis_control_intf, | |
334 | (struct usb_descriptor_header *) &header_desc, | |
335 | (struct usb_descriptor_header *) &call_mgmt_descriptor, | |
336 | (struct usb_descriptor_header *) &rndis_acm_descriptor, | |
337 | (struct usb_descriptor_header *) &rndis_union_desc, | |
338 | (struct usb_descriptor_header *) &ss_notify_desc, | |
339 | (struct usb_descriptor_header *) &ss_intr_comp_desc, | |
340 | ||
341 | /* data interface has no altsetting */ | |
342 | (struct usb_descriptor_header *) &rndis_data_intf, | |
343 | (struct usb_descriptor_header *) &ss_in_desc, | |
344 | (struct usb_descriptor_header *) &ss_bulk_comp_desc, | |
345 | (struct usb_descriptor_header *) &ss_out_desc, | |
346 | (struct usb_descriptor_header *) &ss_bulk_comp_desc, | |
347 | NULL, | |
348 | }; | |
349 | ||
45fe3b8e DB |
350 | /* string descriptors: */ |
351 | ||
352 | static struct usb_string rndis_string_defs[] = { | |
353 | [0].s = "RNDIS Communications Control", | |
354 | [1].s = "RNDIS Ethernet Data", | |
b97503ff | 355 | [2].s = "RNDIS", |
45fe3b8e DB |
356 | { } /* end of list */ |
357 | }; | |
358 | ||
359 | static struct usb_gadget_strings rndis_string_table = { | |
360 | .language = 0x0409, /* en-us */ | |
361 | .strings = rndis_string_defs, | |
362 | }; | |
363 | ||
364 | static struct usb_gadget_strings *rndis_strings[] = { | |
365 | &rndis_string_table, | |
366 | NULL, | |
367 | }; | |
368 | ||
369 | /*-------------------------------------------------------------------------*/ | |
370 | ||
9b39e9dd BN |
371 | static struct sk_buff *rndis_add_header(struct gether *port, |
372 | struct sk_buff *skb) | |
45fe3b8e | 373 | { |
9b39e9dd BN |
374 | struct sk_buff *skb2; |
375 | ||
376 | skb2 = skb_realloc_headroom(skb, sizeof(struct rndis_packet_msg_type)); | |
377 | if (skb2) | |
378 | rndis_add_hdr(skb2); | |
379 | ||
380 | dev_kfree_skb_any(skb); | |
381 | return skb2; | |
45fe3b8e DB |
382 | } |
383 | ||
384 | static void rndis_response_available(void *_rndis) | |
385 | { | |
386 | struct f_rndis *rndis = _rndis; | |
387 | struct usb_request *req = rndis->notify_req; | |
388 | struct usb_composite_dev *cdev = rndis->port.func.config->cdev; | |
389 | __le32 *data = req->buf; | |
390 | int status; | |
391 | ||
ff349505 | 392 | if (atomic_inc_return(&rndis->notify_count) != 1) |
45fe3b8e DB |
393 | return; |
394 | ||
395 | /* Send RNDIS RESPONSE_AVAILABLE notification; a | |
396 | * USB_CDC_NOTIFY_RESPONSE_AVAILABLE "should" work too | |
397 | * | |
398 | * This is the only notification defined by RNDIS. | |
399 | */ | |
400 | data[0] = cpu_to_le32(1); | |
401 | data[1] = cpu_to_le32(0); | |
402 | ||
403 | status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC); | |
404 | if (status) { | |
405 | atomic_dec(&rndis->notify_count); | |
406 | DBG(cdev, "notify/0 --> %d\n", status); | |
407 | } | |
408 | } | |
409 | ||
410 | static void rndis_response_complete(struct usb_ep *ep, struct usb_request *req) | |
411 | { | |
412 | struct f_rndis *rndis = req->context; | |
413 | struct usb_composite_dev *cdev = rndis->port.func.config->cdev; | |
414 | int status = req->status; | |
415 | ||
416 | /* after TX: | |
417 | * - USB_CDC_GET_ENCAPSULATED_RESPONSE (ep0/control) | |
418 | * - RNDIS_RESPONSE_AVAILABLE (status/irq) | |
419 | */ | |
420 | switch (status) { | |
421 | case -ECONNRESET: | |
422 | case -ESHUTDOWN: | |
423 | /* connection gone */ | |
424 | atomic_set(&rndis->notify_count, 0); | |
425 | break; | |
426 | default: | |
427 | DBG(cdev, "RNDIS %s response error %d, %d/%d\n", | |
428 | ep->name, status, | |
429 | req->actual, req->length); | |
430 | /* FALLTHROUGH */ | |
431 | case 0: | |
432 | if (ep != rndis->notify) | |
433 | break; | |
434 | ||
435 | /* handle multiple pending RNDIS_RESPONSE_AVAILABLE | |
436 | * notifications by resending until we're done | |
437 | */ | |
438 | if (atomic_dec_and_test(&rndis->notify_count)) | |
439 | break; | |
440 | status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC); | |
441 | if (status) { | |
442 | atomic_dec(&rndis->notify_count); | |
443 | DBG(cdev, "notify/1 --> %d\n", status); | |
444 | } | |
445 | break; | |
446 | } | |
447 | } | |
448 | ||
449 | static void rndis_command_complete(struct usb_ep *ep, struct usb_request *req) | |
450 | { | |
451 | struct f_rndis *rndis = req->context; | |
45fe3b8e DB |
452 | int status; |
453 | ||
454 | /* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */ | |
455 | // spin_lock(&dev->lock); | |
456 | status = rndis_msg_parser(rndis->config, (u8 *) req->buf); | |
457 | if (status < 0) | |
967baed4 | 458 | pr_err("RNDIS command error %d, %d/%d\n", |
45fe3b8e DB |
459 | status, req->actual, req->length); |
460 | // spin_unlock(&dev->lock); | |
461 | } | |
462 | ||
463 | static int | |
464 | rndis_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) | |
465 | { | |
466 | struct f_rndis *rndis = func_to_rndis(f); | |
467 | struct usb_composite_dev *cdev = f->config->cdev; | |
468 | struct usb_request *req = cdev->req; | |
469 | int value = -EOPNOTSUPP; | |
470 | u16 w_index = le16_to_cpu(ctrl->wIndex); | |
471 | u16 w_value = le16_to_cpu(ctrl->wValue); | |
472 | u16 w_length = le16_to_cpu(ctrl->wLength); | |
473 | ||
474 | /* composite driver infrastructure handles everything except | |
475 | * CDC class messages; interface activation uses set_alt(). | |
476 | */ | |
477 | switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { | |
478 | ||
479 | /* RNDIS uses the CDC command encapsulation mechanism to implement | |
480 | * an RPC scheme, with much getting/setting of attributes by OID. | |
481 | */ | |
482 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | |
483 | | USB_CDC_SEND_ENCAPSULATED_COMMAND: | |
472b9127 | 484 | if (w_value || w_index != rndis->ctrl_id) |
45fe3b8e DB |
485 | goto invalid; |
486 | /* read the request; process it later */ | |
487 | value = w_length; | |
488 | req->complete = rndis_command_complete; | |
489 | req->context = rndis; | |
490 | /* later, rndis_response_available() sends a notification */ | |
491 | break; | |
492 | ||
493 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | |
494 | | USB_CDC_GET_ENCAPSULATED_RESPONSE: | |
495 | if (w_value || w_index != rndis->ctrl_id) | |
496 | goto invalid; | |
497 | else { | |
498 | u8 *buf; | |
499 | u32 n; | |
500 | ||
501 | /* return the result */ | |
502 | buf = rndis_get_next_response(rndis->config, &n); | |
503 | if (buf) { | |
504 | memcpy(req->buf, buf, n); | |
505 | req->complete = rndis_response_complete; | |
f1356172 | 506 | req->context = rndis; |
45fe3b8e DB |
507 | rndis_free_response(rndis->config, buf); |
508 | value = n; | |
509 | } | |
510 | /* else stalls ... spec says to avoid that */ | |
511 | } | |
512 | break; | |
513 | ||
514 | default: | |
515 | invalid: | |
516 | VDBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", | |
517 | ctrl->bRequestType, ctrl->bRequest, | |
518 | w_value, w_index, w_length); | |
519 | } | |
520 | ||
521 | /* respond with data transfer or status phase? */ | |
522 | if (value >= 0) { | |
523 | DBG(cdev, "rndis req%02x.%02x v%04x i%04x l%d\n", | |
524 | ctrl->bRequestType, ctrl->bRequest, | |
525 | w_value, w_index, w_length); | |
090b9011 | 526 | req->zero = (value < w_length); |
45fe3b8e DB |
527 | req->length = value; |
528 | value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
529 | if (value < 0) | |
530 | ERROR(cdev, "rndis response on err %d\n", value); | |
531 | } | |
532 | ||
533 | /* device either stalls (value < 0) or reports success */ | |
534 | return value; | |
535 | } | |
536 | ||
537 | ||
538 | static int rndis_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
539 | { | |
540 | struct f_rndis *rndis = func_to_rndis(f); | |
541 | struct usb_composite_dev *cdev = f->config->cdev; | |
542 | ||
543 | /* we know alt == 0 */ | |
544 | ||
545 | if (intf == rndis->ctrl_id) { | |
546 | if (rndis->notify->driver_data) { | |
547 | VDBG(cdev, "reset rndis control %d\n", intf); | |
548 | usb_ep_disable(rndis->notify); | |
ea2a1df7 TB |
549 | } |
550 | if (!rndis->notify->desc) { | |
45fe3b8e | 551 | VDBG(cdev, "init rndis ctrl %d\n", intf); |
ea2a1df7 TB |
552 | if (config_ep_by_speed(cdev->gadget, f, rndis->notify)) |
553 | goto fail; | |
45fe3b8e | 554 | } |
72c973dd | 555 | usb_ep_enable(rndis->notify); |
45fe3b8e DB |
556 | rndis->notify->driver_data = rndis; |
557 | ||
558 | } else if (intf == rndis->data_id) { | |
559 | struct net_device *net; | |
560 | ||
561 | if (rndis->port.in_ep->driver_data) { | |
562 | DBG(cdev, "reset rndis\n"); | |
563 | gether_disconnect(&rndis->port); | |
830d1b18 MM |
564 | } |
565 | ||
ea2a1df7 | 566 | if (!rndis->port.in_ep->desc || !rndis->port.out_ep->desc) { |
45fe3b8e | 567 | DBG(cdev, "init rndis\n"); |
ea2a1df7 TB |
568 | if (config_ep_by_speed(cdev->gadget, f, |
569 | rndis->port.in_ep) || | |
570 | config_ep_by_speed(cdev->gadget, f, | |
571 | rndis->port.out_ep)) { | |
572 | rndis->port.in_ep->desc = NULL; | |
573 | rndis->port.out_ep->desc = NULL; | |
574 | goto fail; | |
575 | } | |
45fe3b8e DB |
576 | } |
577 | ||
578 | /* Avoid ZLPs; they can be troublesome. */ | |
579 | rndis->port.is_zlp_ok = false; | |
580 | ||
581 | /* RNDIS should be in the "RNDIS uninitialized" state, | |
582 | * either never activated or after rndis_uninit(). | |
583 | * | |
584 | * We don't want data to flow here until a nonzero packet | |
585 | * filter is set, at which point it enters "RNDIS data | |
586 | * initialized" state ... but we do want the endpoints | |
587 | * to be activated. It's a strange little state. | |
588 | * | |
589 | * REVISIT the RNDIS gadget code has done this wrong for a | |
590 | * very long time. We need another call to the link layer | |
591 | * code -- gether_updown(...bool) maybe -- to do it right. | |
592 | */ | |
593 | rndis->port.cdc_filter = 0; | |
594 | ||
595 | DBG(cdev, "RNDIS RX/TX early activation ... \n"); | |
596 | net = gether_connect(&rndis->port); | |
597 | if (IS_ERR(net)) | |
598 | return PTR_ERR(net); | |
599 | ||
600 | rndis_set_param_dev(rndis->config, net, | |
601 | &rndis->port.cdc_filter); | |
602 | } else | |
603 | goto fail; | |
604 | ||
605 | return 0; | |
606 | fail: | |
607 | return -EINVAL; | |
608 | } | |
609 | ||
610 | static void rndis_disable(struct usb_function *f) | |
611 | { | |
612 | struct f_rndis *rndis = func_to_rndis(f); | |
613 | struct usb_composite_dev *cdev = f->config->cdev; | |
614 | ||
615 | if (!rndis->notify->driver_data) | |
616 | return; | |
617 | ||
618 | DBG(cdev, "rndis deactivated\n"); | |
619 | ||
620 | rndis_uninit(rndis->config); | |
621 | gether_disconnect(&rndis->port); | |
622 | ||
623 | usb_ep_disable(rndis->notify); | |
624 | rndis->notify->driver_data = NULL; | |
625 | } | |
626 | ||
627 | /*-------------------------------------------------------------------------*/ | |
628 | ||
629 | /* | |
630 | * This isn't quite the same mechanism as CDC Ethernet, since the | |
631 | * notification scheme passes less data, but the same set of link | |
632 | * states must be tested. A key difference is that altsettings are | |
633 | * not used to tell whether the link should send packets or not. | |
634 | */ | |
635 | ||
636 | static void rndis_open(struct gether *geth) | |
637 | { | |
638 | struct f_rndis *rndis = func_to_rndis(&geth->func); | |
639 | struct usb_composite_dev *cdev = geth->func.config->cdev; | |
640 | ||
641 | DBG(cdev, "%s\n", __func__); | |
642 | ||
17c51b6c | 643 | rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3, |
45fe3b8e DB |
644 | bitrate(cdev->gadget) / 100); |
645 | rndis_signal_connect(rndis->config); | |
646 | } | |
647 | ||
648 | static void rndis_close(struct gether *geth) | |
649 | { | |
650 | struct f_rndis *rndis = func_to_rndis(&geth->func); | |
651 | ||
652 | DBG(geth->func.config->cdev, "%s\n", __func__); | |
653 | ||
17c51b6c | 654 | rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3, 0); |
45fe3b8e DB |
655 | rndis_signal_disconnect(rndis->config); |
656 | } | |
657 | ||
658 | /*-------------------------------------------------------------------------*/ | |
659 | ||
f466c635 AP |
660 | /* Some controllers can't support RNDIS ... */ |
661 | static inline bool can_support_rndis(struct usb_configuration *c) | |
662 | { | |
663 | /* everything else is *presumably* fine */ | |
664 | return true; | |
665 | } | |
666 | ||
45fe3b8e DB |
667 | /* ethernet function driver setup/binding */ |
668 | ||
28824b18 | 669 | static int |
45fe3b8e DB |
670 | rndis_bind(struct usb_configuration *c, struct usb_function *f) |
671 | { | |
672 | struct usb_composite_dev *cdev = c->cdev; | |
673 | struct f_rndis *rndis = func_to_rndis(f); | |
4e75e727 | 674 | struct usb_string *us; |
45fe3b8e DB |
675 | int status; |
676 | struct usb_ep *ep; | |
677 | ||
f466c635 AP |
678 | struct f_rndis_opts *rndis_opts; |
679 | ||
680 | if (!can_support_rndis(c)) | |
681 | return -EINVAL; | |
682 | ||
683 | rndis_opts = container_of(f->fi, struct f_rndis_opts, func_inst); | |
684 | ||
685 | /* | |
686 | * in drivers/usb/gadget/configfs.c:configfs_composite_bind() | |
687 | * configurations are bound in sequence with list_for_each_entry, | |
688 | * in each configuration its functions are bound in sequence | |
689 | * with list_for_each_entry, so we assume no race condition | |
690 | * with regard to rndis_opts->bound access | |
691 | */ | |
692 | if (!rndis_opts->bound) { | |
693 | gether_set_gadget(rndis_opts->net, cdev->gadget); | |
694 | status = gether_register_netdev(rndis_opts->net); | |
695 | if (status) | |
696 | return status; | |
697 | rndis_opts->bound = true; | |
698 | } | |
31f89db1 | 699 | |
4e75e727 AP |
700 | us = usb_gstrings_attach(cdev, rndis_strings, |
701 | ARRAY_SIZE(rndis_string_defs)); | |
702 | if (IS_ERR(us)) | |
703 | return PTR_ERR(us); | |
704 | rndis_control_intf.iInterface = us[0].id; | |
705 | rndis_data_intf.iInterface = us[1].id; | |
706 | rndis_iad_descriptor.iFunction = us[2].id; | |
f466c635 | 707 | |
45fe3b8e DB |
708 | /* allocate instance-specific interface IDs */ |
709 | status = usb_interface_id(c, f); | |
710 | if (status < 0) | |
711 | goto fail; | |
712 | rndis->ctrl_id = status; | |
b97503ff | 713 | rndis_iad_descriptor.bFirstInterface = status; |
45fe3b8e DB |
714 | |
715 | rndis_control_intf.bInterfaceNumber = status; | |
716 | rndis_union_desc.bMasterInterface0 = status; | |
717 | ||
718 | status = usb_interface_id(c, f); | |
719 | if (status < 0) | |
720 | goto fail; | |
721 | rndis->data_id = status; | |
722 | ||
723 | rndis_data_intf.bInterfaceNumber = status; | |
724 | rndis_union_desc.bSlaveInterface0 = status; | |
725 | ||
726 | status = -ENODEV; | |
727 | ||
728 | /* allocate instance-specific endpoints */ | |
729 | ep = usb_ep_autoconfig(cdev->gadget, &fs_in_desc); | |
730 | if (!ep) | |
731 | goto fail; | |
732 | rndis->port.in_ep = ep; | |
733 | ep->driver_data = cdev; /* claim */ | |
734 | ||
735 | ep = usb_ep_autoconfig(cdev->gadget, &fs_out_desc); | |
736 | if (!ep) | |
737 | goto fail; | |
738 | rndis->port.out_ep = ep; | |
739 | ep->driver_data = cdev; /* claim */ | |
740 | ||
741 | /* NOTE: a status/notification endpoint is, strictly speaking, | |
742 | * optional. We don't treat it that way though! It's simpler, | |
743 | * and some newer profiles don't treat it as optional. | |
744 | */ | |
745 | ep = usb_ep_autoconfig(cdev->gadget, &fs_notify_desc); | |
746 | if (!ep) | |
747 | goto fail; | |
748 | rndis->notify = ep; | |
749 | ep->driver_data = cdev; /* claim */ | |
750 | ||
751 | status = -ENOMEM; | |
752 | ||
753 | /* allocate notification request and buffer */ | |
754 | rndis->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
755 | if (!rndis->notify_req) | |
756 | goto fail; | |
757 | rndis->notify_req->buf = kmalloc(STATUS_BYTECOUNT, GFP_KERNEL); | |
758 | if (!rndis->notify_req->buf) | |
759 | goto fail; | |
760 | rndis->notify_req->length = STATUS_BYTECOUNT; | |
761 | rndis->notify_req->context = rndis; | |
762 | rndis->notify_req->complete = rndis_response_complete; | |
763 | ||
45fe3b8e DB |
764 | /* support all relevant hardware speeds... we expect that when |
765 | * hardware is dual speed, all bulk-capable endpoints work at | |
766 | * both speeds | |
767 | */ | |
10287bae SAS |
768 | hs_in_desc.bEndpointAddress = fs_in_desc.bEndpointAddress; |
769 | hs_out_desc.bEndpointAddress = fs_out_desc.bEndpointAddress; | |
770 | hs_notify_desc.bEndpointAddress = fs_notify_desc.bEndpointAddress; | |
45fe3b8e | 771 | |
10287bae SAS |
772 | ss_in_desc.bEndpointAddress = fs_in_desc.bEndpointAddress; |
773 | ss_out_desc.bEndpointAddress = fs_out_desc.bEndpointAddress; | |
774 | ss_notify_desc.bEndpointAddress = fs_notify_desc.bEndpointAddress; | |
775 | ||
776 | status = usb_assign_descriptors(f, eth_fs_function, eth_hs_function, | |
777 | eth_ss_function); | |
778 | if (status) | |
779 | goto fail; | |
04617db7 | 780 | |
45fe3b8e DB |
781 | rndis->port.open = rndis_open; |
782 | rndis->port.close = rndis_close; | |
783 | ||
17c51b6c | 784 | rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3, 0); |
45fe3b8e DB |
785 | rndis_set_host_mac(rndis->config, rndis->ethaddr); |
786 | ||
1fbfeff9 BG |
787 | if (rndis->manufacturer && rndis->vendorID && |
788 | rndis_set_param_vendor(rndis->config, rndis->vendorID, | |
789 | rndis->manufacturer)) | |
790 | goto fail; | |
45fe3b8e DB |
791 | |
792 | /* NOTE: all that is done without knowing or caring about | |
793 | * the network link ... which is unavailable to this code | |
794 | * until we're activated via set_alt(). | |
795 | */ | |
796 | ||
797 | DBG(cdev, "RNDIS: %s speed IN/%s OUT/%s NOTIFY/%s\n", | |
04617db7 | 798 | gadget_is_superspeed(c->cdev->gadget) ? "super" : |
45fe3b8e DB |
799 | gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", |
800 | rndis->port.in_ep->name, rndis->port.out_ep->name, | |
801 | rndis->notify->name); | |
802 | return 0; | |
803 | ||
804 | fail: | |
10287bae | 805 | usb_free_all_descriptors(f); |
45fe3b8e DB |
806 | |
807 | if (rndis->notify_req) { | |
808 | kfree(rndis->notify_req->buf); | |
809 | usb_ep_free_request(rndis->notify, rndis->notify_req); | |
810 | } | |
811 | ||
812 | /* we might as well release our claims on endpoints */ | |
813 | if (rndis->notify) | |
814 | rndis->notify->driver_data = NULL; | |
e79cc615 | 815 | if (rndis->port.out_ep) |
45fe3b8e | 816 | rndis->port.out_ep->driver_data = NULL; |
e79cc615 | 817 | if (rndis->port.in_ep) |
45fe3b8e DB |
818 | rndis->port.in_ep->driver_data = NULL; |
819 | ||
820 | ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); | |
821 | ||
822 | return status; | |
823 | } | |
824 | ||
f466c635 AP |
825 | void rndis_borrow_net(struct usb_function_instance *f, struct net_device *net) |
826 | { | |
827 | struct f_rndis_opts *opts; | |
828 | ||
829 | opts = container_of(f, struct f_rndis_opts, func_inst); | |
830 | if (opts->bound) | |
831 | gether_cleanup(netdev_priv(opts->net)); | |
832 | else | |
833 | free_netdev(opts->net); | |
834 | opts->borrowed_net = opts->bound = true; | |
835 | opts->net = net; | |
836 | } | |
837 | EXPORT_SYMBOL(rndis_borrow_net); | |
838 | ||
b3df2faa AP |
839 | static inline struct f_rndis_opts *to_f_rndis_opts(struct config_item *item) |
840 | { | |
841 | return container_of(to_config_group(item), struct f_rndis_opts, | |
842 | func_inst.group); | |
843 | } | |
844 | ||
845 | /* f_rndis_item_ops */ | |
846 | USB_ETHERNET_CONFIGFS_ITEM(rndis); | |
847 | ||
848 | /* f_rndis_opts_dev_addr */ | |
849 | USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(rndis); | |
850 | ||
851 | /* f_rndis_opts_host_addr */ | |
852 | USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(rndis); | |
853 | ||
854 | /* f_rndis_opts_qmult */ | |
855 | USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(rndis); | |
856 | ||
857 | /* f_rndis_opts_ifname */ | |
858 | USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(rndis); | |
859 | ||
860 | static struct configfs_attribute *rndis_attrs[] = { | |
861 | &f_rndis_opts_dev_addr.attr, | |
862 | &f_rndis_opts_host_addr.attr, | |
863 | &f_rndis_opts_qmult.attr, | |
864 | &f_rndis_opts_ifname.attr, | |
865 | NULL, | |
866 | }; | |
867 | ||
868 | static struct config_item_type rndis_func_type = { | |
869 | .ct_item_ops = &rndis_item_ops, | |
870 | .ct_attrs = rndis_attrs, | |
871 | .ct_owner = THIS_MODULE, | |
872 | }; | |
873 | ||
f466c635 AP |
874 | static void rndis_free_inst(struct usb_function_instance *f) |
875 | { | |
876 | struct f_rndis_opts *opts; | |
877 | ||
878 | opts = container_of(f, struct f_rndis_opts, func_inst); | |
879 | if (!opts->borrowed_net) { | |
880 | if (opts->bound) | |
881 | gether_cleanup(netdev_priv(opts->net)); | |
882 | else | |
883 | free_netdev(opts->net); | |
884 | } | |
885 | kfree(opts); | |
886 | } | |
887 | ||
888 | static struct usb_function_instance *rndis_alloc_inst(void) | |
889 | { | |
890 | struct f_rndis_opts *opts; | |
891 | ||
892 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
893 | if (!opts) | |
894 | return ERR_PTR(-ENOMEM); | |
b3df2faa | 895 | mutex_init(&opts->lock); |
f466c635 AP |
896 | opts->func_inst.free_func_inst = rndis_free_inst; |
897 | opts->net = gether_setup_default(); | |
172d934c AP |
898 | if (IS_ERR(opts->net)) { |
899 | struct net_device *net = opts->net; | |
900 | kfree(opts); | |
901 | return ERR_CAST(net); | |
902 | } | |
f466c635 | 903 | |
b3df2faa AP |
904 | config_group_init_type_name(&opts->func_inst.group, "", |
905 | &rndis_func_type); | |
906 | ||
f466c635 AP |
907 | return &opts->func_inst; |
908 | } | |
909 | ||
910 | static void rndis_free(struct usb_function *f) | |
911 | { | |
912 | struct f_rndis *rndis; | |
b3df2faa | 913 | struct f_rndis_opts *opts; |
f466c635 AP |
914 | |
915 | rndis = func_to_rndis(f); | |
916 | rndis_deregister(rndis->config); | |
b3df2faa | 917 | opts = container_of(f->fi, struct f_rndis_opts, func_inst); |
f466c635 | 918 | kfree(rndis); |
b3df2faa AP |
919 | mutex_lock(&opts->lock); |
920 | opts->refcnt--; | |
921 | mutex_unlock(&opts->lock); | |
f466c635 AP |
922 | } |
923 | ||
924 | static void rndis_unbind(struct usb_configuration *c, struct usb_function *f) | |
925 | { | |
926 | struct f_rndis *rndis = func_to_rndis(f); | |
927 | ||
f466c635 AP |
928 | usb_free_all_descriptors(f); |
929 | ||
930 | kfree(rndis->notify_req->buf); | |
931 | usb_ep_free_request(rndis->notify, rndis->notify_req); | |
932 | } | |
933 | ||
934 | static struct usb_function *rndis_alloc(struct usb_function_instance *fi) | |
935 | { | |
936 | struct f_rndis *rndis; | |
937 | struct f_rndis_opts *opts; | |
938 | int status; | |
939 | ||
940 | /* allocate and initialize one new instance */ | |
941 | rndis = kzalloc(sizeof(*rndis), GFP_KERNEL); | |
76da66d1 | 942 | if (!rndis) |
f466c635 | 943 | return ERR_PTR(-ENOMEM); |
f466c635 AP |
944 | |
945 | opts = container_of(fi, struct f_rndis_opts, func_inst); | |
b3df2faa AP |
946 | mutex_lock(&opts->lock); |
947 | opts->refcnt++; | |
f466c635 AP |
948 | |
949 | gether_get_host_addr_u8(opts->net, rndis->ethaddr); | |
950 | rndis->vendorID = opts->vendor_id; | |
951 | rndis->manufacturer = opts->manufacturer; | |
952 | ||
953 | rndis->port.ioport = netdev_priv(opts->net); | |
b3df2faa | 954 | mutex_unlock(&opts->lock); |
f466c635 AP |
955 | /* RNDIS activates when the host changes this filter */ |
956 | rndis->port.cdc_filter = 0; | |
957 | ||
958 | /* RNDIS has special (and complex) framing */ | |
959 | rndis->port.header_len = sizeof(struct rndis_packet_msg_type); | |
960 | rndis->port.wrap = rndis_add_header; | |
961 | rndis->port.unwrap = rndis_rm_hdr; | |
962 | ||
963 | rndis->port.func.name = "rndis"; | |
f466c635 AP |
964 | /* descriptors are per-instance copies */ |
965 | rndis->port.func.bind = rndis_bind; | |
966 | rndis->port.func.unbind = rndis_unbind; | |
967 | rndis->port.func.set_alt = rndis_set_alt; | |
968 | rndis->port.func.setup = rndis_setup; | |
969 | rndis->port.func.disable = rndis_disable; | |
970 | rndis->port.func.free_func = rndis_free; | |
971 | ||
972 | status = rndis_register(rndis_response_available, rndis); | |
973 | if (status < 0) { | |
974 | kfree(rndis); | |
975 | return ERR_PTR(status); | |
976 | } | |
977 | rndis->config = status; | |
978 | ||
979 | return &rndis->port.func; | |
980 | } | |
981 | ||
9c2b85f4 AP |
982 | DECLARE_USB_FUNCTION(rndis, rndis_alloc_inst, rndis_alloc); |
983 | ||
984 | static int __init rndis_mod_init(void) | |
985 | { | |
986 | int ret; | |
987 | ||
988 | ret = rndis_init(); | |
989 | if (ret) | |
990 | return ret; | |
991 | ||
992 | return usb_function_register(&rndisusb_func); | |
993 | } | |
994 | module_init(rndis_mod_init); | |
995 | ||
996 | static void __exit rndis_mod_exit(void) | |
997 | { | |
998 | usb_function_unregister(&rndisusb_func); | |
999 | rndis_exit(); | |
1000 | } | |
1001 | module_exit(rndis_mod_exit); | |
1002 | ||
f466c635 AP |
1003 | MODULE_LICENSE("GPL"); |
1004 | MODULE_AUTHOR("David Brownell"); |