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proc: use seq_puts()/seq_putc() where possible
[linux-2.6/next.git] / drivers / usb / gadget / f_ncm.c
blob130eee678c8bbd84043303378e18a2cf95fb783c
1 /*
2 * f_ncm.c -- USB CDC Network (NCM) link function driver
3 *
4 * Copyright (C) 2010 Nokia Corporation
5 * Contact: Yauheni Kaliuta <yauheni.kaliuta@nokia.com>
6 *
7 * The driver borrows from f_ecm.c which is:
8 *
9 * Copyright (C) 2003-2005,2008 David Brownell
10 * Copyright (C) 2008 Nokia Corporation
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/device.h>
29 #include <linux/etherdevice.h>
30 #include <linux/crc32.h>
31
32 #include <linux/usb/cdc.h>
33
34 #include "u_ether.h"
35
36 /*
37 * This function is a "CDC Network Control Model" (CDC NCM) Ethernet link.
38 * NCM is intended to be used with high-speed network attachments.
39 *
40 * Note that NCM requires the use of "alternate settings" for its data
41 * interface. This means that the set_alt() method has real work to do,
42 * and also means that a get_alt() method is required.
43 */
44
45 /* to trigger crc/non-crc ndp signature */
46
47 #define NCM_NDP_HDR_CRC_MASK 0x01000000
48 #define NCM_NDP_HDR_CRC 0x01000000
49 #define NCM_NDP_HDR_NOCRC 0x00000000
50
51 struct ncm_ep_descs {
52 struct usb_endpoint_descriptor *in;
53 struct usb_endpoint_descriptor *out;
54 struct usb_endpoint_descriptor *notify;
55 };
56
57 enum ncm_notify_state {
58 NCM_NOTIFY_NONE, /* don't notify */
59 NCM_NOTIFY_CONNECT, /* issue CONNECT next */
60 NCM_NOTIFY_SPEED, /* issue SPEED_CHANGE next */
61 };
62
63 struct f_ncm {
64 struct gether port;
65 u8 ctrl_id, data_id;
66
67 char ethaddr[14];
68
69 struct ncm_ep_descs fs;
70 struct ncm_ep_descs hs;
71
72 struct usb_ep *notify;
73 struct usb_endpoint_descriptor *notify_desc;
74 struct usb_request *notify_req;
75 u8 notify_state;
76 bool is_open;
77
78 struct ndp_parser_opts *parser_opts;
79 bool is_crc;
80
81 /*
82 * for notification, it is accessed from both
83 * callback and ethernet open/close
84 */
85 spinlock_t lock;
86 };
87
88 static inline struct f_ncm *func_to_ncm(struct usb_function *f)
89 {
90 return container_of(f, struct f_ncm, port.func);
91 }
92
93 /* peak (theoretical) bulk transfer rate in bits-per-second */
94 static inline unsigned ncm_bitrate(struct usb_gadget *g)
95 {
96 if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
97 return 13 * 512 * 8 * 1000 * 8;
98 else
99 return 19 * 64 * 1 * 1000 * 8;
100 }
101
102 /*-------------------------------------------------------------------------*/
103
104 /*
105 * We cannot group frames so use just the minimal size which ok to put
106 * one max-size ethernet frame.
107 * If the host can group frames, allow it to do that, 16K is selected,
108 * because it's used by default by the current linux host driver
109 */
110 #define NTB_DEFAULT_IN_SIZE USB_CDC_NCM_NTB_MIN_IN_SIZE
111 #define NTB_OUT_SIZE 16384
112
113 /*
114 * skbs of size less than that will not be alligned
115 * to NCM's dwNtbInMaxSize to save bus bandwidth
116 */
117
118 #define MAX_TX_NONFIXED (512 * 3)
119
120 #define FORMATS_SUPPORTED (USB_CDC_NCM_NTB16_SUPPORTED | \
121 USB_CDC_NCM_NTB32_SUPPORTED)
122
123 static struct usb_cdc_ncm_ntb_parameters ntb_parameters = {
124 .wLength = sizeof ntb_parameters,
125 .bmNtbFormatsSupported = cpu_to_le16(FORMATS_SUPPORTED),
126 .dwNtbInMaxSize = cpu_to_le32(NTB_DEFAULT_IN_SIZE),
127 .wNdpInDivisor = cpu_to_le16(4),
128 .wNdpInPayloadRemainder = cpu_to_le16(0),
129 .wNdpInAlignment = cpu_to_le16(4),
130
131 .dwNtbOutMaxSize = cpu_to_le32(NTB_OUT_SIZE),
132 .wNdpOutDivisor = cpu_to_le16(4),
133 .wNdpOutPayloadRemainder = cpu_to_le16(0),
134 .wNdpOutAlignment = cpu_to_le16(4),
135 };
136
137 /*
138 * Use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one
139 * packet, to simplify cancellation; and a big transfer interval, to
140 * waste less bandwidth.
141 */
142
143 #define LOG2_STATUS_INTERVAL_MSEC 5 /* 1 << 5 == 32 msec */
144 #define NCM_STATUS_BYTECOUNT 16 /* 8 byte header + data */
145
146 static struct usb_interface_assoc_descriptor ncm_iad_desc __initdata = {
147 .bLength = sizeof ncm_iad_desc,
148 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
149
150 /* .bFirstInterface = DYNAMIC, */
151 .bInterfaceCount = 2, /* control + data */
152 .bFunctionClass = USB_CLASS_COMM,
153 .bFunctionSubClass = USB_CDC_SUBCLASS_NCM,
154 .bFunctionProtocol = USB_CDC_PROTO_NONE,
155 /* .iFunction = DYNAMIC */
156 };
157
158 /* interface descriptor: */
159
160 static struct usb_interface_descriptor ncm_control_intf __initdata = {
161 .bLength = sizeof ncm_control_intf,
162 .bDescriptorType = USB_DT_INTERFACE,
163
164 /* .bInterfaceNumber = DYNAMIC */
165 .bNumEndpoints = 1,
166 .bInterfaceClass = USB_CLASS_COMM,
167 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
168 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
169 /* .iInterface = DYNAMIC */
170 };
171
172 static struct usb_cdc_header_desc ncm_header_desc __initdata = {
173 .bLength = sizeof ncm_header_desc,
174 .bDescriptorType = USB_DT_CS_INTERFACE,
175 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
176
177 .bcdCDC = cpu_to_le16(0x0110),
178 };
179
180 static struct usb_cdc_union_desc ncm_union_desc __initdata = {
181 .bLength = sizeof(ncm_union_desc),
182 .bDescriptorType = USB_DT_CS_INTERFACE,
183 .bDescriptorSubType = USB_CDC_UNION_TYPE,
184 /* .bMasterInterface0 = DYNAMIC */
185 /* .bSlaveInterface0 = DYNAMIC */
186 };
187
188 static struct usb_cdc_ether_desc ecm_desc __initdata = {
189 .bLength = sizeof ecm_desc,
190 .bDescriptorType = USB_DT_CS_INTERFACE,
191 .bDescriptorSubType = USB_CDC_ETHERNET_TYPE,
192
193 /* this descriptor actually adds value, surprise! */
194 /* .iMACAddress = DYNAMIC */
195 .bmEthernetStatistics = cpu_to_le32(0), /* no statistics */
196 .wMaxSegmentSize = cpu_to_le16(ETH_FRAME_LEN),
197 .wNumberMCFilters = cpu_to_le16(0),
198 .bNumberPowerFilters = 0,
199 };
200
201 #define NCAPS (USB_CDC_NCM_NCAP_ETH_FILTER | USB_CDC_NCM_NCAP_CRC_MODE)
202
203 static struct usb_cdc_ncm_desc ncm_desc __initdata = {
204 .bLength = sizeof ncm_desc,
205 .bDescriptorType = USB_DT_CS_INTERFACE,
206 .bDescriptorSubType = USB_CDC_NCM_TYPE,
207
208 .bcdNcmVersion = cpu_to_le16(0x0100),
209 /* can process SetEthernetPacketFilter */
210 .bmNetworkCapabilities = NCAPS,
211 };
212
213 /* the default data interface has no endpoints ... */
214
215 static struct usb_interface_descriptor ncm_data_nop_intf __initdata = {
216 .bLength = sizeof ncm_data_nop_intf,
217 .bDescriptorType = USB_DT_INTERFACE,
218
219 .bInterfaceNumber = 1,
220 .bAlternateSetting = 0,
221 .bNumEndpoints = 0,
222 .bInterfaceClass = USB_CLASS_CDC_DATA,
223 .bInterfaceSubClass = 0,
224 .bInterfaceProtocol = USB_CDC_NCM_PROTO_NTB,
225 /* .iInterface = DYNAMIC */
226 };
227
228 /* ... but the "real" data interface has two bulk endpoints */
229
230 static struct usb_interface_descriptor ncm_data_intf __initdata = {
231 .bLength = sizeof ncm_data_intf,
232 .bDescriptorType = USB_DT_INTERFACE,
233
234 .bInterfaceNumber = 1,
235 .bAlternateSetting = 1,
236 .bNumEndpoints = 2,
237 .bInterfaceClass = USB_CLASS_CDC_DATA,
238 .bInterfaceSubClass = 0,
239 .bInterfaceProtocol = USB_CDC_NCM_PROTO_NTB,
240 /* .iInterface = DYNAMIC */
241 };
242
243 /* full speed support: */
244
245 static struct usb_endpoint_descriptor fs_ncm_notify_desc __initdata = {
246 .bLength = USB_DT_ENDPOINT_SIZE,
247 .bDescriptorType = USB_DT_ENDPOINT,
248
249 .bEndpointAddress = USB_DIR_IN,
250 .bmAttributes = USB_ENDPOINT_XFER_INT,
251 .wMaxPacketSize = cpu_to_le16(NCM_STATUS_BYTECOUNT),
252 .bInterval = 1 << LOG2_STATUS_INTERVAL_MSEC,
253 };
254
255 static struct usb_endpoint_descriptor fs_ncm_in_desc __initdata = {
256 .bLength = USB_DT_ENDPOINT_SIZE,
257 .bDescriptorType = USB_DT_ENDPOINT,
258
259 .bEndpointAddress = USB_DIR_IN,
260 .bmAttributes = USB_ENDPOINT_XFER_BULK,
261 };
262
263 static struct usb_endpoint_descriptor fs_ncm_out_desc __initdata = {
264 .bLength = USB_DT_ENDPOINT_SIZE,
265 .bDescriptorType = USB_DT_ENDPOINT,
266
267 .bEndpointAddress = USB_DIR_OUT,
268 .bmAttributes = USB_ENDPOINT_XFER_BULK,
269 };
270
271 static struct usb_descriptor_header *ncm_fs_function[] __initdata = {
272 (struct usb_descriptor_header *) &ncm_iad_desc,
273 /* CDC NCM control descriptors */
274 (struct usb_descriptor_header *) &ncm_control_intf,
275 (struct usb_descriptor_header *) &ncm_header_desc,
276 (struct usb_descriptor_header *) &ncm_union_desc,
277 (struct usb_descriptor_header *) &ecm_desc,
278 (struct usb_descriptor_header *) &ncm_desc,
279 (struct usb_descriptor_header *) &fs_ncm_notify_desc,
280 /* data interface, altsettings 0 and 1 */
281 (struct usb_descriptor_header *) &ncm_data_nop_intf,
282 (struct usb_descriptor_header *) &ncm_data_intf,
283 (struct usb_descriptor_header *) &fs_ncm_in_desc,
284 (struct usb_descriptor_header *) &fs_ncm_out_desc,
285 NULL,
286 };
287
288 /* high speed support: */
289
290 static struct usb_endpoint_descriptor hs_ncm_notify_desc __initdata = {
291 .bLength = USB_DT_ENDPOINT_SIZE,
292 .bDescriptorType = USB_DT_ENDPOINT,
293
294 .bEndpointAddress = USB_DIR_IN,
295 .bmAttributes = USB_ENDPOINT_XFER_INT,
296 .wMaxPacketSize = cpu_to_le16(NCM_STATUS_BYTECOUNT),
297 .bInterval = LOG2_STATUS_INTERVAL_MSEC + 4,
298 };
299 static struct usb_endpoint_descriptor hs_ncm_in_desc __initdata = {
300 .bLength = USB_DT_ENDPOINT_SIZE,
301 .bDescriptorType = USB_DT_ENDPOINT,
302
303 .bEndpointAddress = USB_DIR_IN,
304 .bmAttributes = USB_ENDPOINT_XFER_BULK,
305 .wMaxPacketSize = cpu_to_le16(512),
306 };
307
308 static struct usb_endpoint_descriptor hs_ncm_out_desc __initdata = {
309 .bLength = USB_DT_ENDPOINT_SIZE,
310 .bDescriptorType = USB_DT_ENDPOINT,
311
312 .bEndpointAddress = USB_DIR_OUT,
313 .bmAttributes = USB_ENDPOINT_XFER_BULK,
314 .wMaxPacketSize = cpu_to_le16(512),
315 };
316
317 static struct usb_descriptor_header *ncm_hs_function[] __initdata = {
318 (struct usb_descriptor_header *) &ncm_iad_desc,
319 /* CDC NCM control descriptors */
320 (struct usb_descriptor_header *) &ncm_control_intf,
321 (struct usb_descriptor_header *) &ncm_header_desc,
322 (struct usb_descriptor_header *) &ncm_union_desc,
323 (struct usb_descriptor_header *) &ecm_desc,
324 (struct usb_descriptor_header *) &ncm_desc,
325 (struct usb_descriptor_header *) &hs_ncm_notify_desc,
326 /* data interface, altsettings 0 and 1 */
327 (struct usb_descriptor_header *) &ncm_data_nop_intf,
328 (struct usb_descriptor_header *) &ncm_data_intf,
329 (struct usb_descriptor_header *) &hs_ncm_in_desc,
330 (struct usb_descriptor_header *) &hs_ncm_out_desc,
331 NULL,
332 };
333
334 /* string descriptors: */
335
336 #define STRING_CTRL_IDX 0
337 #define STRING_MAC_IDX 1
338 #define STRING_DATA_IDX 2
339 #define STRING_IAD_IDX 3
340
341 static struct usb_string ncm_string_defs[] = {
342 [STRING_CTRL_IDX].s = "CDC Network Control Model (NCM)",
343 [STRING_MAC_IDX].s = NULL /* DYNAMIC */,
344 [STRING_DATA_IDX].s = "CDC Network Data",
345 [STRING_IAD_IDX].s = "CDC NCM",
346 { } /* end of list */
347 };
348
349 static struct usb_gadget_strings ncm_string_table = {
350 .language = 0x0409, /* en-us */
351 .strings = ncm_string_defs,
352 };
353
354 static struct usb_gadget_strings *ncm_strings[] = {
355 &ncm_string_table,
356 NULL,
357 };
358
359 /*
360 * Here are options for NCM Datagram Pointer table (NDP) parser.
361 * There are 2 different formats: NDP16 and NDP32 in the spec (ch. 3),
362 * in NDP16 offsets and sizes fields are 1 16bit word wide,
363 * in NDP32 -- 2 16bit words wide. Also signatures are different.
364 * To make the parser code the same, put the differences in the structure,
365 * and switch pointers to the structures when the format is changed.
366 */
367
368 struct ndp_parser_opts {
369 u32 nth_sign;
370 u32 ndp_sign;
371 unsigned nth_size;
372 unsigned ndp_size;
373 unsigned ndplen_align;
374 /* sizes in u16 units */
375 unsigned dgram_item_len; /* index or length */
376 unsigned block_length;
377 unsigned fp_index;
378 unsigned reserved1;
379 unsigned reserved2;
380 unsigned next_fp_index;
381 };
382
383 #define INIT_NDP16_OPTS { \
384 .nth_sign = USB_CDC_NCM_NTH16_SIGN, \
385 .ndp_sign = USB_CDC_NCM_NDP16_NOCRC_SIGN, \
386 .nth_size = sizeof(struct usb_cdc_ncm_nth16), \
387 .ndp_size = sizeof(struct usb_cdc_ncm_ndp16), \
388 .ndplen_align = 4, \
389 .dgram_item_len = 1, \
390 .block_length = 1, \
391 .fp_index = 1, \
392 .reserved1 = 0, \
393 .reserved2 = 0, \
394 .next_fp_index = 1, \
395 }
396
397
398 #define INIT_NDP32_OPTS { \
399 .nth_sign = USB_CDC_NCM_NTH32_SIGN, \
400 .ndp_sign = USB_CDC_NCM_NDP32_NOCRC_SIGN, \
401 .nth_size = sizeof(struct usb_cdc_ncm_nth32), \
402 .ndp_size = sizeof(struct usb_cdc_ncm_ndp32), \
403 .ndplen_align = 8, \
404 .dgram_item_len = 2, \
405 .block_length = 2, \
406 .fp_index = 2, \
407 .reserved1 = 1, \
408 .reserved2 = 2, \
409 .next_fp_index = 2, \
410 }
411
412 static struct ndp_parser_opts ndp16_opts = INIT_NDP16_OPTS;
413 static struct ndp_parser_opts ndp32_opts = INIT_NDP32_OPTS;
414
415 static inline void put_ncm(__le16 **p, unsigned size, unsigned val)
416 {
417 switch (size) {
418 case 1:
419 put_unaligned_le16((u16)val, *p);
420 break;
421 case 2:
422 put_unaligned_le32((u32)val, *p);
423
424 break;
425 default:
426 BUG();
427 }
428
429 *p += size;
430 }
431
432 static inline unsigned get_ncm(__le16 **p, unsigned size)
433 {
434 unsigned tmp;
435
436 switch (size) {
437 case 1:
438 tmp = get_unaligned_le16(*p);
439 break;
440 case 2:
441 tmp = get_unaligned_le32(*p);
442 break;
443 default:
444 BUG();
445 }
446
447 *p += size;
448 return tmp;
449 }
450
451 /*-------------------------------------------------------------------------*/
452
453 static inline void ncm_reset_values(struct f_ncm *ncm)
454 {
455 ncm->parser_opts = &ndp16_opts;
456 ncm->is_crc = false;
457 ncm->port.cdc_filter = DEFAULT_FILTER;
458
459 /* doesn't make sense for ncm, fixed size used */
460 ncm->port.header_len = 0;
461
462 ncm->port.fixed_out_len = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize);
463 ncm->port.fixed_in_len = NTB_DEFAULT_IN_SIZE;
464 }
465
466 /*
467 * Context: ncm->lock held
468 */
469 static void ncm_do_notify(struct f_ncm *ncm)
470 {
471 struct usb_request *req = ncm->notify_req;
472 struct usb_cdc_notification *event;
473 struct usb_composite_dev *cdev = ncm->port.func.config->cdev;
474 __le32 *data;
475 int status;
476
477 /* notification already in flight? */
478 if (!req)
479 return;
480
481 event = req->buf;
482 switch (ncm->notify_state) {
483 case NCM_NOTIFY_NONE:
484 return;
485
486 case NCM_NOTIFY_CONNECT:
487 event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION;
488 if (ncm->is_open)
489 event->wValue = cpu_to_le16(1);
490 else
491 event->wValue = cpu_to_le16(0);
492 event->wLength = 0;
493 req->length = sizeof *event;
494
495 DBG(cdev, "notify connect %s\n",
496 ncm->is_open ? "true" : "false");
497 ncm->notify_state = NCM_NOTIFY_NONE;
498 break;
499
500 case NCM_NOTIFY_SPEED:
501 event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE;
502 event->wValue = cpu_to_le16(0);
503 event->wLength = cpu_to_le16(8);
504 req->length = NCM_STATUS_BYTECOUNT;
505
506 /* SPEED_CHANGE data is up/down speeds in bits/sec */
507 data = req->buf + sizeof *event;
508 data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget));
509 data[1] = data[0];
510
511 DBG(cdev, "notify speed %d\n", ncm_bitrate(cdev->gadget));
512 ncm->notify_state = NCM_NOTIFY_CONNECT;
513 break;
514 }
515 event->bmRequestType = 0xA1;
516 event->wIndex = cpu_to_le16(ncm->ctrl_id);
517
518 ncm->notify_req = NULL;
519 /*
520 * In double buffering if there is a space in FIFO,
521 * completion callback can be called right after the call,
522 * so unlocking
523 */
524 spin_unlock(&ncm->lock);
525 status = usb_ep_queue(ncm->notify, req, GFP_ATOMIC);
526 spin_lock(&ncm->lock);
527 if (status < 0) {
528 ncm->notify_req = req;
529 DBG(cdev, "notify --> %d\n", status);
530 }
531 }
532
533 /*
534 * Context: ncm->lock held
535 */
536 static void ncm_notify(struct f_ncm *ncm)
537 {
538 /*
539 * NOTE on most versions of Linux, host side cdc-ethernet
540 * won't listen for notifications until its netdevice opens.
541 * The first notification then sits in the FIFO for a long
542 * time, and the second one is queued.
543 *
544 * If ncm_notify() is called before the second (CONNECT)
545 * notification is sent, then it will reset to send the SPEED
546 * notificaion again (and again, and again), but it's not a problem
547 */
548 ncm->notify_state = NCM_NOTIFY_SPEED;
549 ncm_do_notify(ncm);
550 }
551
552 static void ncm_notify_complete(struct usb_ep *ep, struct usb_request *req)
553 {
554 struct f_ncm *ncm = req->context;
555 struct usb_composite_dev *cdev = ncm->port.func.config->cdev;
556 struct usb_cdc_notification *event = req->buf;
557
558 spin_lock(&ncm->lock);
559 switch (req->status) {
560 case 0:
561 VDBG(cdev, "Notification %02x sent\n",
562 event->bNotificationType);
563 break;
564 case -ECONNRESET:
565 case -ESHUTDOWN:
566 ncm->notify_state = NCM_NOTIFY_NONE;
567 break;
568 default:
569 DBG(cdev, "event %02x --> %d\n",
570 event->bNotificationType, req->status);
571 break;
572 }
573 ncm->notify_req = req;
574 ncm_do_notify(ncm);
575 spin_unlock(&ncm->lock);
576 }
577
578 static void ncm_ep0out_complete(struct usb_ep *ep, struct usb_request *req)
579 {
580 /* now for SET_NTB_INPUT_SIZE only */
581 unsigned in_size;
582 struct usb_function *f = req->context;
583 struct f_ncm *ncm = func_to_ncm(f);
584 struct usb_composite_dev *cdev = ep->driver_data;
585
586 req->context = NULL;
587 if (req->status || req->actual != req->length) {
588 DBG(cdev, "Bad control-OUT transfer\n");
589 goto invalid;
590 }
591
592 in_size = get_unaligned_le32(req->buf);
593 if (in_size < USB_CDC_NCM_NTB_MIN_IN_SIZE ||
594 in_size > le32_to_cpu(ntb_parameters.dwNtbInMaxSize)) {
595 DBG(cdev, "Got wrong INPUT SIZE (%d) from host\n", in_size);
596 goto invalid;
597 }
598
599 ncm->port.fixed_in_len = in_size;
600 VDBG(cdev, "Set NTB INPUT SIZE %d\n", in_size);
601 return;
602
603 invalid:
604 usb_ep_set_halt(ep);
605 return;
606 }
607
608 static int ncm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
609 {
610 struct f_ncm *ncm = func_to_ncm(f);
611 struct usb_composite_dev *cdev = f->config->cdev;
612 struct usb_request *req = cdev->req;
613 int value = -EOPNOTSUPP;
614 u16 w_index = le16_to_cpu(ctrl->wIndex);
615 u16 w_value = le16_to_cpu(ctrl->wValue);
616 u16 w_length = le16_to_cpu(ctrl->wLength);
617
618 /*
619 * composite driver infrastructure handles everything except
620 * CDC class messages; interface activation uses set_alt().
621 */
622 switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
623 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
624 | USB_CDC_SET_ETHERNET_PACKET_FILTER:
625 /*
626 * see 6.2.30: no data, wIndex = interface,
627 * wValue = packet filter bitmap
628 */
629 if (w_length != 0 || w_index != ncm->ctrl_id)
630 goto invalid;
631 DBG(cdev, "packet filter %02x\n", w_value);
632 /*
633 * REVISIT locking of cdc_filter. This assumes the UDC
634 * driver won't have a concurrent packet TX irq running on
635 * another CPU; or that if it does, this write is atomic...
636 */
637 ncm->port.cdc_filter = w_value;
638 value = 0;
639 break;
640 /*
641 * and optionally:
642 * case USB_CDC_SEND_ENCAPSULATED_COMMAND:
643 * case USB_CDC_GET_ENCAPSULATED_RESPONSE:
644 * case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS:
645 * case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER:
646 * case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER:
647 * case USB_CDC_GET_ETHERNET_STATISTIC:
648 */
649
650 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
651 | USB_CDC_GET_NTB_PARAMETERS:
652
653 if (w_length == 0 || w_value != 0 || w_index != ncm->ctrl_id)
654 goto invalid;
655 value = w_length > sizeof ntb_parameters ?
656 sizeof ntb_parameters : w_length;
657 memcpy(req->buf, &ntb_parameters, value);
658 VDBG(cdev, "Host asked NTB parameters\n");
659 break;
660
661 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
662 | USB_CDC_GET_NTB_INPUT_SIZE:
663
664 if (w_length < 4 || w_value != 0 || w_index != ncm->ctrl_id)
665 goto invalid;
666 put_unaligned_le32(ncm->port.fixed_in_len, req->buf);
667 value = 4;
668 VDBG(cdev, "Host asked INPUT SIZE, sending %d\n",
669 ncm->port.fixed_in_len);
670 break;
671
672 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
673 | USB_CDC_SET_NTB_INPUT_SIZE:
674 {
675 if (w_length != 4 || w_value != 0 || w_index != ncm->ctrl_id)
676 goto invalid;
677 req->complete = ncm_ep0out_complete;
678 req->length = w_length;
679 req->context = f;
680
681 value = req->length;
682 break;
683 }
684
685 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
686 | USB_CDC_GET_NTB_FORMAT:
687 {
688 uint16_t format;
689
690 if (w_length < 2 || w_value != 0 || w_index != ncm->ctrl_id)
691 goto invalid;
692 format = (ncm->parser_opts == &ndp16_opts) ? 0x0000 : 0x0001;
693 put_unaligned_le16(format, req->buf);
694 value = 2;
695 VDBG(cdev, "Host asked NTB FORMAT, sending %d\n", format);
696 break;
697 }
698
699 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
700 | USB_CDC_SET_NTB_FORMAT:
701 {
702 if (w_length != 0 || w_index != ncm->ctrl_id)
703 goto invalid;
704 switch (w_value) {
705 case 0x0000:
706 ncm->parser_opts = &ndp16_opts;
707 DBG(cdev, "NCM16 selected\n");
708 break;
709 case 0x0001:
710 ncm->parser_opts = &ndp32_opts;
711 DBG(cdev, "NCM32 selected\n");
712 break;
713 default:
714 goto invalid;
715 }
716 value = 0;
717 break;
718 }
719 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
720 | USB_CDC_GET_CRC_MODE:
721 {
722 uint16_t is_crc;
723
724 if (w_length < 2 || w_value != 0 || w_index != ncm->ctrl_id)
725 goto invalid;
726 is_crc = ncm->is_crc ? 0x0001 : 0x0000;
727 put_unaligned_le16(is_crc, req->buf);
728 value = 2;
729 VDBG(cdev, "Host asked CRC MODE, sending %d\n", is_crc);
730 break;
731 }
732
733 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
734 | USB_CDC_SET_CRC_MODE:
735 {
736 int ndp_hdr_crc = 0;
737
738 if (w_length != 0 || w_index != ncm->ctrl_id)
739 goto invalid;
740 switch (w_value) {
741 case 0x0000:
742 ncm->is_crc = false;
743 ndp_hdr_crc = NCM_NDP_HDR_NOCRC;
744 DBG(cdev, "non-CRC mode selected\n");
745 break;
746 case 0x0001:
747 ncm->is_crc = true;
748 ndp_hdr_crc = NCM_NDP_HDR_CRC;
749 DBG(cdev, "CRC mode selected\n");
750 break;
751 default:
752 goto invalid;
753 }
754 ncm->parser_opts->ndp_sign &= ~NCM_NDP_HDR_CRC_MASK;
755 ncm->parser_opts->ndp_sign |= ndp_hdr_crc;
756 value = 0;
757 break;
758 }
759
760 /* and disabled in ncm descriptor: */
761 /* case USB_CDC_GET_NET_ADDRESS: */
762 /* case USB_CDC_SET_NET_ADDRESS: */
763 /* case USB_CDC_GET_MAX_DATAGRAM_SIZE: */
764 /* case USB_CDC_SET_MAX_DATAGRAM_SIZE: */
765
766 default:
767 invalid:
768 DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
769 ctrl->bRequestType, ctrl->bRequest,
770 w_value, w_index, w_length);
771 }
772
773 /* respond with data transfer or status phase? */
774 if (value >= 0) {
775 DBG(cdev, "ncm req%02x.%02x v%04x i%04x l%d\n",
776 ctrl->bRequestType, ctrl->bRequest,
777 w_value, w_index, w_length);
778 req->zero = 0;
779 req->length = value;
780 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
781 if (value < 0)
782 ERROR(cdev, "ncm req %02x.%02x response err %d\n",
783 ctrl->bRequestType, ctrl->bRequest,
784 value);
785 }
786
787 /* device either stalls (value < 0) or reports success */
788 return value;
789 }
790
791
792 static int ncm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
793 {
794 struct f_ncm *ncm = func_to_ncm(f);
795 struct usb_composite_dev *cdev = f->config->cdev;
796
797 /* Control interface has only altsetting 0 */
798 if (intf == ncm->ctrl_id) {
799 if (alt != 0)
800 goto fail;
801
802 if (ncm->notify->driver_data) {
803 DBG(cdev, "reset ncm control %d\n", intf);
804 usb_ep_disable(ncm->notify);
805 } else {
806 DBG(cdev, "init ncm ctrl %d\n", intf);
807 ncm->notify_desc = ep_choose(cdev->gadget,
808 ncm->hs.notify,
809 ncm->fs.notify);
810 }
811 usb_ep_enable(ncm->notify, ncm->notify_desc);
812 ncm->notify->driver_data = ncm;
813
814 /* Data interface has two altsettings, 0 and 1 */
815 } else if (intf == ncm->data_id) {
816 if (alt > 1)
817 goto fail;
818
819 if (ncm->port.in_ep->driver_data) {
820 DBG(cdev, "reset ncm\n");
821 gether_disconnect(&ncm->port);
822 ncm_reset_values(ncm);
823 }
824
825 /*
826 * CDC Network only sends data in non-default altsettings.
827 * Changing altsettings resets filters, statistics, etc.
828 */
829 if (alt == 1) {
830 struct net_device *net;
831
832 if (!ncm->port.in) {
833 DBG(cdev, "init ncm\n");
834 ncm->port.in = ep_choose(cdev->gadget,
835 ncm->hs.in,
836 ncm->fs.in);
837 ncm->port.out = ep_choose(cdev->gadget,
838 ncm->hs.out,
839 ncm->fs.out);
840 }
841
842 /* TODO */
843 /* Enable zlps by default for NCM conformance;
844 * override for musb_hdrc (avoids txdma ovhead)
845 */
846 ncm->port.is_zlp_ok = !(
847 gadget_is_musbhdrc(cdev->gadget)
848 );
849 ncm->port.cdc_filter = DEFAULT_FILTER;
850 DBG(cdev, "activate ncm\n");
851 net = gether_connect(&ncm->port);
852 if (IS_ERR(net))
853 return PTR_ERR(net);
854 }
855
856 spin_lock(&ncm->lock);
857 ncm_notify(ncm);
858 spin_unlock(&ncm->lock);
859 } else
860 goto fail;
861
862 return 0;
863 fail:
864 return -EINVAL;
865 }
866
867 /*
868 * Because the data interface supports multiple altsettings,
869 * this NCM function *MUST* implement a get_alt() method.
870 */
871 static int ncm_get_alt(struct usb_function *f, unsigned intf)
872 {
873 struct f_ncm *ncm = func_to_ncm(f);
874
875 if (intf == ncm->ctrl_id)
876 return 0;
877 return ncm->port.in_ep->driver_data ? 1 : 0;
878 }
879
880 static struct sk_buff *ncm_wrap_ntb(struct gether *port,
881 struct sk_buff *skb)
882 {
883 struct f_ncm *ncm = func_to_ncm(&port->func);
884 struct sk_buff *skb2;
885 int ncb_len = 0;
886 __le16 *tmp;
887 int div = ntb_parameters.wNdpInDivisor;
888 int rem = ntb_parameters.wNdpInPayloadRemainder;
889 int pad;
890 int ndp_align = ntb_parameters.wNdpInAlignment;
891 int ndp_pad;
892 unsigned max_size = ncm->port.fixed_in_len;
893 struct ndp_parser_opts *opts = ncm->parser_opts;
894 unsigned crc_len = ncm->is_crc ? sizeof(uint32_t) : 0;
895
896 ncb_len += opts->nth_size;
897 ndp_pad = ALIGN(ncb_len, ndp_align) - ncb_len;
898 ncb_len += ndp_pad;
899 ncb_len += opts->ndp_size;
900 ncb_len += 2 * 2 * opts->dgram_item_len; /* Datagram entry */
901 ncb_len += 2 * 2 * opts->dgram_item_len; /* Zero datagram entry */
902 pad = ALIGN(ncb_len, div) + rem - ncb_len;
903 ncb_len += pad;
904
905 if (ncb_len + skb->len + crc_len > max_size) {
906 dev_kfree_skb_any(skb);
907 return NULL;
908 }
909
910 skb2 = skb_copy_expand(skb, ncb_len,
911 max_size - skb->len - ncb_len - crc_len,
912 GFP_ATOMIC);
913 dev_kfree_skb_any(skb);
914 if (!skb2)
915 return NULL;
916
917 skb = skb2;
918
919 tmp = (void *) skb_push(skb, ncb_len);
920 memset(tmp, 0, ncb_len);
921
922 put_unaligned_le32(opts->nth_sign, tmp); /* dwSignature */
923 tmp += 2;
924 /* wHeaderLength */
925 put_unaligned_le16(opts->nth_size, tmp++);
926 tmp++; /* skip wSequence */
927 put_ncm(&tmp, opts->block_length, skb->len); /* (d)wBlockLength */
928 /* (d)wFpIndex */
929 /* the first pointer is right after the NTH + align */
930 put_ncm(&tmp, opts->fp_index, opts->nth_size + ndp_pad);
931
932 tmp = (void *)tmp + ndp_pad;
933
934 /* NDP */
935 put_unaligned_le32(opts->ndp_sign, tmp); /* dwSignature */
936 tmp += 2;
937 /* wLength */
938 put_unaligned_le16(ncb_len - opts->nth_size - pad, tmp++);
939
940 tmp += opts->reserved1;
941 tmp += opts->next_fp_index; /* skip reserved (d)wNextFpIndex */
942 tmp += opts->reserved2;
943
944 if (ncm->is_crc) {
945 uint32_t crc;
946
947 crc = ~crc32_le(~0,
948 skb->data + ncb_len,
949 skb->len - ncb_len);
950 put_unaligned_le32(crc, skb->data + skb->len);
951 skb_put(skb, crc_len);
952 }
953
954 /* (d)wDatagramIndex[0] */
955 put_ncm(&tmp, opts->dgram_item_len, ncb_len);
956 /* (d)wDatagramLength[0] */
957 put_ncm(&tmp, opts->dgram_item_len, skb->len - ncb_len);
958 /* (d)wDatagramIndex[1] and (d)wDatagramLength[1] already zeroed */
959
960 if (skb->len > MAX_TX_NONFIXED)
961 memset(skb_put(skb, max_size - skb->len),
962 0, max_size - skb->len);
963
964 return skb;
965 }
966
967 static int ncm_unwrap_ntb(struct gether *port,
968 struct sk_buff *skb,
969 struct sk_buff_head *list)
970 {
971 struct f_ncm *ncm = func_to_ncm(&port->func);
972 __le16 *tmp = (void *) skb->data;
973 unsigned index, index2;
974 unsigned dg_len, dg_len2;
975 unsigned ndp_len;
976 struct sk_buff *skb2;
977 int ret = -EINVAL;
978 unsigned max_size = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize);
979 struct ndp_parser_opts *opts = ncm->parser_opts;
980 unsigned crc_len = ncm->is_crc ? sizeof(uint32_t) : 0;
981 int dgram_counter;
982
983 /* dwSignature */
984 if (get_unaligned_le32(tmp) != opts->nth_sign) {
985 INFO(port->func.config->cdev, "Wrong NTH SIGN, skblen %d\n",
986 skb->len);
987 print_hex_dump(KERN_INFO, "HEAD:", DUMP_PREFIX_ADDRESS, 32, 1,
988 skb->data, 32, false);
989
990 goto err;
991 }
992 tmp += 2;
993 /* wHeaderLength */
994 if (get_unaligned_le16(tmp++) != opts->nth_size) {
995 INFO(port->func.config->cdev, "Wrong NTB headersize\n");
996 goto err;
997 }
998 tmp++; /* skip wSequence */
999
1000 /* (d)wBlockLength */
1001 if (get_ncm(&tmp, opts->block_length) > max_size) {
1002 INFO(port->func.config->cdev, "OUT size exceeded\n");
1003 goto err;
1004 }
1005
1006 index = get_ncm(&tmp, opts->fp_index);
1007 /* NCM 3.2 */
1008 if (((index % 4) != 0) && (index < opts->nth_size)) {
1009 INFO(port->func.config->cdev, "Bad index: %x\n",
1010 index);
1011 goto err;
1012 }
1013
1014 /* walk through NDP */
1015 tmp = ((void *)skb->data) + index;
1016 if (get_unaligned_le32(tmp) != opts->ndp_sign) {
1017 INFO(port->func.config->cdev, "Wrong NDP SIGN\n");
1018 goto err;
1019 }
1020 tmp += 2;
1021
1022 ndp_len = get_unaligned_le16(tmp++);
1023 /*
1024 * NCM 3.3.1
1025 * entry is 2 items
1026 * item size is 16/32 bits, opts->dgram_item_len * 2 bytes
1027 * minimal: struct usb_cdc_ncm_ndpX + normal entry + zero entry
1028 */
1029 if ((ndp_len < opts->ndp_size + 2 * 2 * (opts->dgram_item_len * 2))
1030 || (ndp_len % opts->ndplen_align != 0)) {
1031 INFO(port->func.config->cdev, "Bad NDP length: %x\n", ndp_len);
1032 goto err;
1033 }
1034 tmp += opts->reserved1;
1035 tmp += opts->next_fp_index; /* skip reserved (d)wNextFpIndex */
1036 tmp += opts->reserved2;
1037
1038 ndp_len -= opts->ndp_size;
1039 index2 = get_ncm(&tmp, opts->dgram_item_len);
1040 dg_len2 = get_ncm(&tmp, opts->dgram_item_len);
1041 dgram_counter = 0;
1042
1043 do {
1044 index = index2;
1045 dg_len = dg_len2;
1046 if (dg_len < 14 + crc_len) { /* ethernet header + crc */
1047 INFO(port->func.config->cdev, "Bad dgram length: %x\n",
1048 dg_len);
1049 goto err;
1050 }
1051 if (ncm->is_crc) {
1052 uint32_t crc, crc2;
1053
1054 crc = get_unaligned_le32(skb->data +
1055 index + dg_len - crc_len);
1056 crc2 = ~crc32_le(~0,
1057 skb->data + index,
1058 dg_len - crc_len);
1059 if (crc != crc2) {
1060 INFO(port->func.config->cdev, "Bad CRC\n");
1061 goto err;
1062 }
1063 }
1064
1065 index2 = get_ncm(&tmp, opts->dgram_item_len);
1066 dg_len2 = get_ncm(&tmp, opts->dgram_item_len);
1067
1068 if (index2 == 0 || dg_len2 == 0) {
1069 skb2 = skb;
1070 } else {
1071 skb2 = skb_clone(skb, GFP_ATOMIC);
1072 if (skb2 == NULL)
1073 goto err;
1074 }
1075
1076 if (!skb_pull(skb2, index)) {
1077 ret = -EOVERFLOW;
1078 goto err;
1079 }
1080
1081 skb_trim(skb2, dg_len - crc_len);
1082 skb_queue_tail(list, skb2);
1083
1084 ndp_len -= 2 * (opts->dgram_item_len * 2);
1085
1086 dgram_counter++;
1087
1088 if (index2 == 0 || dg_len2 == 0)
1089 break;
1090 } while (ndp_len > 2 * (opts->dgram_item_len * 2)); /* zero entry */
1091
1092 VDBG(port->func.config->cdev,
1093 "Parsed NTB with %d frames\n", dgram_counter);
1094 return 0;
1095 err:
1096 skb_queue_purge(list);
1097 dev_kfree_skb_any(skb);
1098 return ret;
1099 }
1100
1101 static void ncm_disable(struct usb_function *f)
1102 {
1103 struct f_ncm *ncm = func_to_ncm(f);
1104 struct usb_composite_dev *cdev = f->config->cdev;
1105
1106 DBG(cdev, "ncm deactivated\n");
1107
1108 if (ncm->port.in_ep->driver_data)
1109 gether_disconnect(&ncm->port);
1110
1111 if (ncm->notify->driver_data) {
1112 usb_ep_disable(ncm->notify);
1113 ncm->notify->driver_data = NULL;
1114 ncm->notify_desc = NULL;
1115 }
1116 }
1117
1118 /*-------------------------------------------------------------------------*/
1119
1120 /*
1121 * Callbacks let us notify the host about connect/disconnect when the
1122 * net device is opened or closed.
1123 *
1124 * For testing, note that link states on this side include both opened
1125 * and closed variants of:
1126 *
1127 * - disconnected/unconfigured
1128 * - configured but inactive (data alt 0)
1129 * - configured and active (data alt 1)
1130 *
1131 * Each needs to be tested with unplug, rmmod, SET_CONFIGURATION, and
1132 * SET_INTERFACE (altsetting). Remember also that "configured" doesn't
1133 * imply the host is actually polling the notification endpoint, and
1134 * likewise that "active" doesn't imply it's actually using the data
1135 * endpoints for traffic.
1136 */
1137
1138 static void ncm_open(struct gether *geth)
1139 {
1140 struct f_ncm *ncm = func_to_ncm(&geth->func);
1141
1142 DBG(ncm->port.func.config->cdev, "%s\n", __func__);
1143
1144 spin_lock(&ncm->lock);
1145 ncm->is_open = true;
1146 ncm_notify(ncm);
1147 spin_unlock(&ncm->lock);
1148 }
1149
1150 static void ncm_close(struct gether *geth)
1151 {
1152 struct f_ncm *ncm = func_to_ncm(&geth->func);
1153
1154 DBG(ncm->port.func.config->cdev, "%s\n", __func__);
1155
1156 spin_lock(&ncm->lock);
1157 ncm->is_open = false;
1158 ncm_notify(ncm);
1159 spin_unlock(&ncm->lock);
1160 }
1161
1162 /*-------------------------------------------------------------------------*/
1163
1164 /* ethernet function driver setup/binding */
1165
1166 static int __init
1167 ncm_bind(struct usb_configuration *c, struct usb_function *f)
1168 {
1169 struct usb_composite_dev *cdev = c->cdev;
1170 struct f_ncm *ncm = func_to_ncm(f);
1171 int status;
1172 struct usb_ep *ep;
1173
1174 /* allocate instance-specific interface IDs */
1175 status = usb_interface_id(c, f);
1176 if (status < 0)
1177 goto fail;
1178 ncm->ctrl_id = status;
1179 ncm_iad_desc.bFirstInterface = status;
1180
1181 ncm_control_intf.bInterfaceNumber = status;
1182 ncm_union_desc.bMasterInterface0 = status;
1183
1184 status = usb_interface_id(c, f);
1185 if (status < 0)
1186 goto fail;
1187 ncm->data_id = status;
1188
1189 ncm_data_nop_intf.bInterfaceNumber = status;
1190 ncm_data_intf.bInterfaceNumber = status;
1191 ncm_union_desc.bSlaveInterface0 = status;
1192
1193 status = -ENODEV;
1194
1195 /* allocate instance-specific endpoints */
1196 ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_in_desc);
1197 if (!ep)
1198 goto fail;
1199 ncm->port.in_ep = ep;
1200 ep->driver_data = cdev; /* claim */
1201
1202 ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_out_desc);
1203 if (!ep)
1204 goto fail;
1205 ncm->port.out_ep = ep;
1206 ep->driver_data = cdev; /* claim */
1207
1208 ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_notify_desc);
1209 if (!ep)
1210 goto fail;
1211 ncm->notify = ep;
1212 ep->driver_data = cdev; /* claim */
1213
1214 status = -ENOMEM;
1215
1216 /* allocate notification request and buffer */
1217 ncm->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL);
1218 if (!ncm->notify_req)
1219 goto fail;
1220 ncm->notify_req->buf = kmalloc(NCM_STATUS_BYTECOUNT, GFP_KERNEL);
1221 if (!ncm->notify_req->buf)
1222 goto fail;
1223 ncm->notify_req->context = ncm;
1224 ncm->notify_req->complete = ncm_notify_complete;
1225
1226 /* copy descriptors, and track endpoint copies */
1227 f->descriptors = usb_copy_descriptors(ncm_fs_function);
1228 if (!f->descriptors)
1229 goto fail;
1230
1231 ncm->fs.in = usb_find_endpoint(ncm_fs_function,
1232 f->descriptors, &fs_ncm_in_desc);
1233 ncm->fs.out = usb_find_endpoint(ncm_fs_function,
1234 f->descriptors, &fs_ncm_out_desc);
1235 ncm->fs.notify = usb_find_endpoint(ncm_fs_function,
1236 f->descriptors, &fs_ncm_notify_desc);
1237
1238 /*
1239 * support all relevant hardware speeds... we expect that when
1240 * hardware is dual speed, all bulk-capable endpoints work at
1241 * both speeds
1242 */
1243 if (gadget_is_dualspeed(c->cdev->gadget)) {
1244 hs_ncm_in_desc.bEndpointAddress =
1245 fs_ncm_in_desc.bEndpointAddress;
1246 hs_ncm_out_desc.bEndpointAddress =
1247 fs_ncm_out_desc.bEndpointAddress;
1248 hs_ncm_notify_desc.bEndpointAddress =
1249 fs_ncm_notify_desc.bEndpointAddress;
1250
1251 /* copy descriptors, and track endpoint copies */
1252 f->hs_descriptors = usb_copy_descriptors(ncm_hs_function);
1253 if (!f->hs_descriptors)
1254 goto fail;
1255
1256 ncm->hs.in = usb_find_endpoint(ncm_hs_function,
1257 f->hs_descriptors, &hs_ncm_in_desc);
1258 ncm->hs.out = usb_find_endpoint(ncm_hs_function,
1259 f->hs_descriptors, &hs_ncm_out_desc);
1260 ncm->hs.notify = usb_find_endpoint(ncm_hs_function,
1261 f->hs_descriptors, &hs_ncm_notify_desc);
1262 }
1263
1264 /*
1265 * NOTE: all that is done without knowing or caring about
1266 * the network link ... which is unavailable to this code
1267 * until we're activated via set_alt().
1268 */
1269
1270 ncm->port.open = ncm_open;
1271 ncm->port.close = ncm_close;
1272
1273 DBG(cdev, "CDC Network: %s speed IN/%s OUT/%s NOTIFY/%s\n",
1274 gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
1275 ncm->port.in_ep->name, ncm->port.out_ep->name,
1276 ncm->notify->name);
1277 return 0;
1278
1279 fail:
1280 if (f->descriptors)
1281 usb_free_descriptors(f->descriptors);
1282
1283 if (ncm->notify_req) {
1284 kfree(ncm->notify_req->buf);
1285 usb_ep_free_request(ncm->notify, ncm->notify_req);
1286 }
1287
1288 /* we might as well release our claims on endpoints */
1289 if (ncm->notify)
1290 ncm->notify->driver_data = NULL;
1291 if (ncm->port.out)
1292 ncm->port.out_ep->driver_data = NULL;
1293 if (ncm->port.in)
1294 ncm->port.in_ep->driver_data = NULL;
1295
1296 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
1297
1298 return status;
1299 }
1300
1301 static void
1302 ncm_unbind(struct usb_configuration *c, struct usb_function *f)
1303 {
1304 struct f_ncm *ncm = func_to_ncm(f);
1305
1306 DBG(c->cdev, "ncm unbind\n");
1307
1308 if (gadget_is_dualspeed(c->cdev->gadget))
1309 usb_free_descriptors(f->hs_descriptors);
1310 usb_free_descriptors(f->descriptors);
1311
1312 kfree(ncm->notify_req->buf);
1313 usb_ep_free_request(ncm->notify, ncm->notify_req);
1314
1315 ncm_string_defs[1].s = NULL;
1316 kfree(ncm);
1317 }
1318
1319 /**
1320 * ncm_bind_config - add CDC Network link to a configuration
1321 * @c: the configuration to support the network link
1322 * @ethaddr: a buffer in which the ethernet address of the host side
1323 * side of the link was recorded
1324 * Context: single threaded during gadget setup
1325 *
1326 * Returns zero on success, else negative errno.
1327 *
1328 * Caller must have called @gether_setup(). Caller is also responsible
1329 * for calling @gether_cleanup() before module unload.
1330 */
1331 int __init ncm_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN])
1332 {
1333 struct f_ncm *ncm;
1334 int status;
1335
1336 if (!can_support_ecm(c->cdev->gadget) || !ethaddr)
1337 return -EINVAL;
1338
1339 /* maybe allocate device-global string IDs */
1340 if (ncm_string_defs[0].id == 0) {
1341
1342 /* control interface label */
1343 status = usb_string_id(c->cdev);
1344 if (status < 0)
1345 return status;
1346 ncm_string_defs[STRING_CTRL_IDX].id = status;
1347 ncm_control_intf.iInterface = status;
1348
1349 /* data interface label */
1350 status = usb_string_id(c->cdev);
1351 if (status < 0)
1352 return status;
1353 ncm_string_defs[STRING_DATA_IDX].id = status;
1354 ncm_data_nop_intf.iInterface = status;
1355 ncm_data_intf.iInterface = status;
1356
1357 /* MAC address */
1358 status = usb_string_id(c->cdev);
1359 if (status < 0)
1360 return status;
1361 ncm_string_defs[STRING_MAC_IDX].id = status;
1362 ecm_desc.iMACAddress = status;
1363
1364 /* IAD */
1365 status = usb_string_id(c->cdev);
1366 if (status < 0)
1367 return status;
1368 ncm_string_defs[STRING_IAD_IDX].id = status;
1369 ncm_iad_desc.iFunction = status;
1370 }
1371
1372 /* allocate and initialize one new instance */
1373 ncm = kzalloc(sizeof *ncm, GFP_KERNEL);
1374 if (!ncm)
1375 return -ENOMEM;
1376
1377 /* export host's Ethernet address in CDC format */
1378 snprintf(ncm->ethaddr, sizeof ncm->ethaddr,
1379 "%02X%02X%02X%02X%02X%02X",
1380 ethaddr[0], ethaddr[1], ethaddr[2],
1381 ethaddr[3], ethaddr[4], ethaddr[5]);
1382 ncm_string_defs[1].s = ncm->ethaddr;
1383
1384 spin_lock_init(&ncm->lock);
1385 ncm_reset_values(ncm);
1386 ncm->port.is_fixed = true;
1387
1388 ncm->port.func.name = "cdc_network";
1389 ncm->port.func.strings = ncm_strings;
1390 /* descriptors are per-instance copies */
1391 ncm->port.func.bind = ncm_bind;
1392 ncm->port.func.unbind = ncm_unbind;
1393 ncm->port.func.set_alt = ncm_set_alt;
1394 ncm->port.func.get_alt = ncm_get_alt;
1395 ncm->port.func.setup = ncm_setup;
1396 ncm->port.func.disable = ncm_disable;
1397
1398 ncm->port.wrap = ncm_wrap_ntb;
1399 ncm->port.unwrap = ncm_unwrap_ntb;
1400
1401 status = usb_add_function(c, &ncm->port.func);
1402 if (status) {
1403 ncm_string_defs[1].s = NULL;
1404 kfree(ncm);
1405 }
1406 return status;
1407 }
linux-next