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path: root/drivers/usb/wusbcore/cbaf.c
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Diffstat (limited to 'drivers/usb/wusbcore/cbaf.c')
-rw-r--r--drivers/usb/wusbcore/cbaf.c673
1 files changed, 673 insertions, 0 deletions
diff --git a/drivers/usb/wusbcore/cbaf.c b/drivers/usb/wusbcore/cbaf.c
new file mode 100644
index 00000000000..ab4788d1785
--- /dev/null
+++ b/drivers/usb/wusbcore/cbaf.c
@@ -0,0 +1,673 @@
1/*
2 * Wireless USB - Cable Based Association
3 *
4 *
5 * Copyright (C) 2006 Intel Corporation
6 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
7 * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License version
11 * 2 as published by the Free Software Foundation.
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., 51 Franklin Street, Fifth Floor, Boston, MA
21 * 02110-1301, USA.
22 *
23 *
24 * WUSB devices have to be paired (associated in WUSB lingo) so
25 * that they can connect to the system.
26 *
27 * One way of pairing is using CBA-Cable Based Association. First
28 * time you plug the device with a cable, association is done between
29 * host and device and subsequent times, you can connect wirelessly
30 * without having to associate again. That's the idea.
31 *
32 * This driver does nothing Earth shattering. It just provides an
33 * interface to chat with the wire-connected device so we can get a
34 * CDID (device ID) that might have been previously associated to a
35 * CHID (host ID) and to set up a new <CHID,CDID,CK> triplet
36 * (connection context), with the CK being the secret, or connection
37 * key. This is the pairing data.
38 *
39 * When a device with the CBA capability connects, the probe routine
40 * just creates a bunch of sysfs files that a user space enumeration
41 * manager uses to allow it to connect wirelessly to the system or not.
42 *
43 * The process goes like this:
44 *
45 * 1. Device plugs, cbaf is loaded, notifications happen.
46 *
47 * 2. The connection manager (CM) sees a device with CBAF capability
48 * (the wusb_chid etc. files in /sys/devices/blah/OURDEVICE).
49 *
50 * 3. The CM writes the host name, supported band groups, and the CHID
51 * (host ID) into the wusb_host_name, wusb_host_band_groups and
52 * wusb_chid files. These get sent to the device and the CDID (if
53 * any) for this host is requested.
54 *
55 * 4. The CM can verify that the device's supported band groups
56 * (wusb_device_band_groups) are compatible with the host.
57 *
58 * 5. The CM reads the wusb_cdid file.
59 *
60 * 6. The CM looks up its database
61 *
62 * 6.1 If it has a matching CHID,CDID entry, the device has been
63 * authorized before (paired) and nothing further needs to be
64 * done.
65 *
66 * 6.2 If the CDID is zero (or the CM doesn't find a matching CDID in
67 * its database), the device is assumed to be not known. The CM
68 * may associate the host with device by: writing a randomly
69 * generated CDID to wusb_cdid and then a random CK to wusb_ck
70 * (this uploads the new CC to the device).
71 *
72 * CMD may choose to prompt the user before associating with a new
73 * device.
74 *
75 * 7. Device is unplugged.
76 *
77 * When the device tries to connect wirelessly, it will present its
78 * CDID to the WUSB host controller. The CM will query the
79 * database. If the CHID/CDID pair found, it will (with a 4-way
80 * handshake) challenge the device to demonstrate it has the CK secret
81 * key (from our database) without actually exchanging it. Once
82 * satisfied, crypto keys are derived from the CK, the device is
83 * connected and all communication is encrypted.
84 *
85 * References:
86 * [WUSB-AM] Association Models Supplement to the Certified Wireless
87 * Universal Serial Bus Specification, version 1.0.
88 */
89#include <linux/module.h>
90#include <linux/ctype.h>
91#include <linux/version.h>
92#include <linux/usb.h>
93#include <linux/interrupt.h>
94#include <linux/delay.h>
95#include <linux/random.h>
96#include <linux/mutex.h>
97#include <linux/uwb.h>
98#include <linux/usb/wusb.h>
99#include <linux/usb/association.h>
100
101#define CBA_NAME_LEN 0x40 /* [WUSB-AM] table 4-7 */
102
103/* An instance of a Cable-Based-Association-Framework device */
104struct cbaf {
105 struct usb_device *usb_dev;
106 struct usb_interface *usb_iface;
107 void *buffer;
108 size_t buffer_size;
109
110 struct wusb_ckhdid chid;
111 char host_name[CBA_NAME_LEN];
112 u16 host_band_groups;
113
114 struct wusb_ckhdid cdid;
115 char device_name[CBA_NAME_LEN];
116 u16 device_band_groups;
117
118 struct wusb_ckhdid ck;
119};
120
121/*
122 * Verify that a CBAF USB-interface has what we need
123 *
124 * According to [WUSB-AM], CBA devices should provide at least two
125 * interfaces:
126 * - RETRIEVE_HOST_INFO
127 * - ASSOCIATE
128 *
129 * If the device doesn't provide these interfaces, we do not know how
130 * to deal with it.
131 */
132static int cbaf_check(struct cbaf *cbaf)
133{
134 int result;
135 struct device *dev = &cbaf->usb_iface->dev;
136 struct wusb_cbaf_assoc_info *assoc_info;
137 struct wusb_cbaf_assoc_request *assoc_request;
138 size_t assoc_size;
139 void *itr, *top;
140 int ar_rhi = 0, ar_assoc = 0;
141
142 result = usb_control_msg(
143 cbaf->usb_dev, usb_rcvctrlpipe(cbaf->usb_dev, 0),
144 CBAF_REQ_GET_ASSOCIATION_INFORMATION,
145 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
146 0, cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber,
147 cbaf->buffer, cbaf->buffer_size, 1000 /* FIXME: arbitrary */);
148 if (result < 0) {
149 dev_err(dev, "Cannot get available association types: %d\n",
150 result);
151 return result;
152 }
153
154 assoc_info = cbaf->buffer;
155 if (result < sizeof(*assoc_info)) {
156 dev_err(dev, "Not enough data to decode association info "
157 "header (%zu vs %zu bytes required)\n",
158 (size_t)result, sizeof(*assoc_info));
159 return result;
160 }
161
162 assoc_size = le16_to_cpu(assoc_info->Length);
163 if (result < assoc_size) {
164 dev_err(dev, "Not enough data to decode association info "
165 "(%zu vs %zu bytes required)\n",
166 (size_t)assoc_size, sizeof(*assoc_info));
167 return result;
168 }
169 /*
170 * From now on, we just verify, but won't error out unless we
171 * don't find the AR_TYPE_WUSB_{RETRIEVE_HOST_INFO,ASSOCIATE}
172 * types.
173 */
174 itr = cbaf->buffer + sizeof(*assoc_info);
175 top = cbaf->buffer + assoc_size;
176 dev_dbg(dev, "Found %u association requests (%zu bytes)\n",
177 assoc_info->NumAssociationRequests, assoc_size);
178
179 while (itr < top) {
180 u16 ar_type, ar_subtype;
181 u32 ar_size;
182 const char *ar_name;
183
184 assoc_request = itr;
185
186 if (top - itr < sizeof(*assoc_request)) {
187 dev_err(dev, "Not enough data to decode associaton "
188 "request (%zu vs %zu bytes needed)\n",
189 top - itr, sizeof(*assoc_request));
190 break;
191 }
192
193 ar_type = le16_to_cpu(assoc_request->AssociationTypeId);
194 ar_subtype = le16_to_cpu(assoc_request->AssociationSubTypeId);
195 ar_size = le32_to_cpu(assoc_request->AssociationTypeInfoSize);
196 ar_name = "unknown";
197
198 switch (ar_type) {
199 case AR_TYPE_WUSB:
200 /* Verify we have what is mandated by [WUSB-AM]. */
201 switch (ar_subtype) {
202 case AR_TYPE_WUSB_RETRIEVE_HOST_INFO:
203 ar_name = "RETRIEVE_HOST_INFO";
204 ar_rhi = 1;
205 break;
206 case AR_TYPE_WUSB_ASSOCIATE:
207 /* send assoc data */
208 ar_name = "ASSOCIATE";
209 ar_assoc = 1;
210 break;
211 };
212 break;
213 };
214
215 dev_dbg(dev, "Association request #%02u: 0x%04x/%04x "
216 "(%zu bytes): %s\n",
217 assoc_request->AssociationDataIndex, ar_type,
218 ar_subtype, (size_t)ar_size, ar_name);
219
220 itr += sizeof(*assoc_request);
221 }
222
223 if (!ar_rhi) {
224 dev_err(dev, "Missing RETRIEVE_HOST_INFO association "
225 "request\n");
226 return -EINVAL;
227 }
228 if (!ar_assoc) {
229 dev_err(dev, "Missing ASSOCIATE association request\n");
230 return -EINVAL;
231 }
232
233 return 0;
234}
235
236static const struct wusb_cbaf_host_info cbaf_host_info_defaults = {
237 .AssociationTypeId_hdr = WUSB_AR_AssociationTypeId,
238 .AssociationTypeId = cpu_to_le16(AR_TYPE_WUSB),
239 .AssociationSubTypeId_hdr = WUSB_AR_AssociationSubTypeId,
240 .AssociationSubTypeId = cpu_to_le16(AR_TYPE_WUSB_RETRIEVE_HOST_INFO),
241 .CHID_hdr = WUSB_AR_CHID,
242 .LangID_hdr = WUSB_AR_LangID,
243 .HostFriendlyName_hdr = WUSB_AR_HostFriendlyName,
244};
245
246/* Send WUSB host information (CHID and name) to a CBAF device */
247static int cbaf_send_host_info(struct cbaf *cbaf)
248{
249 struct wusb_cbaf_host_info *hi;
250 size_t name_len;
251 size_t hi_size;
252
253 hi = cbaf->buffer;
254 memset(hi, 0, sizeof(*hi));
255 *hi = cbaf_host_info_defaults;
256 hi->CHID = cbaf->chid;
257 hi->LangID = 0; /* FIXME: I guess... */
258 strlcpy(hi->HostFriendlyName, cbaf->host_name, CBA_NAME_LEN);
259 name_len = strlen(cbaf->host_name);
260 hi->HostFriendlyName_hdr.len = cpu_to_le16(name_len);
261 hi_size = sizeof(*hi) + name_len;
262
263 return usb_control_msg(cbaf->usb_dev, usb_sndctrlpipe(cbaf->usb_dev, 0),
264 CBAF_REQ_SET_ASSOCIATION_RESPONSE,
265 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
266 0x0101,
267 cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber,
268 hi, hi_size, 1000 /* FIXME: arbitrary */);
269}
270
271/*
272 * Get device's information (CDID) associated to CHID
273 *
274 * The device will return it's information (CDID, name, bandgroups)
275 * associated to the CHID we have set before, or 0 CDID and default
276 * name and bandgroup if no CHID set or unknown.
277 */
278static int cbaf_cdid_get(struct cbaf *cbaf)
279{
280 int result;
281 struct device *dev = &cbaf->usb_iface->dev;
282 struct wusb_cbaf_device_info *di;
283 size_t needed;
284
285 di = cbaf->buffer;
286 result = usb_control_msg(
287 cbaf->usb_dev, usb_rcvctrlpipe(cbaf->usb_dev, 0),
288 CBAF_REQ_GET_ASSOCIATION_REQUEST,
289 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
290 0x0200, cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber,
291 di, cbaf->buffer_size, 1000 /* FIXME: arbitrary */);
292 if (result < 0) {
293 dev_err(dev, "Cannot request device information: %d\n", result);
294 return result;
295 }
296
297 needed = result < sizeof(*di) ? sizeof(*di) : le32_to_cpu(di->Length);
298 if (result < needed) {
299 dev_err(dev, "Not enough data in DEVICE_INFO reply (%zu vs "
300 "%zu bytes needed)\n", (size_t)result, needed);
301 return result;
302 }
303
304 strlcpy(cbaf->device_name, di->DeviceFriendlyName, CBA_NAME_LEN);
305 cbaf->cdid = di->CDID;
306 cbaf->device_band_groups = le16_to_cpu(di->BandGroups);
307
308 return 0;
309}
310
311static ssize_t cbaf_wusb_chid_show(struct device *dev,
312 struct device_attribute *attr,
313 char *buf)
314{
315 struct usb_interface *iface = to_usb_interface(dev);
316 struct cbaf *cbaf = usb_get_intfdata(iface);
317 char pr_chid[WUSB_CKHDID_STRSIZE];
318
319 ckhdid_printf(pr_chid, sizeof(pr_chid), &cbaf->chid);
320 return scnprintf(buf, PAGE_SIZE, "%s\n", pr_chid);
321}
322
323static ssize_t cbaf_wusb_chid_store(struct device *dev,
324 struct device_attribute *attr,
325 const char *buf, size_t size)
326{
327 ssize_t result;
328 struct usb_interface *iface = to_usb_interface(dev);
329 struct cbaf *cbaf = usb_get_intfdata(iface);
330
331 result = sscanf(buf,
332 "%02hhx %02hhx %02hhx %02hhx "
333 "%02hhx %02hhx %02hhx %02hhx "
334 "%02hhx %02hhx %02hhx %02hhx "
335 "%02hhx %02hhx %02hhx %02hhx",
336 &cbaf->chid.data[0] , &cbaf->chid.data[1],
337 &cbaf->chid.data[2] , &cbaf->chid.data[3],
338 &cbaf->chid.data[4] , &cbaf->chid.data[5],
339 &cbaf->chid.data[6] , &cbaf->chid.data[7],
340 &cbaf->chid.data[8] , &cbaf->chid.data[9],
341 &cbaf->chid.data[10], &cbaf->chid.data[11],
342 &cbaf->chid.data[12], &cbaf->chid.data[13],
343 &cbaf->chid.data[14], &cbaf->chid.data[15]);
344
345 if (result != 16)
346 return -EINVAL;
347
348 result = cbaf_send_host_info(cbaf);
349 if (result < 0)
350 return result;
351 result = cbaf_cdid_get(cbaf);
352 if (result < 0)
353 return -result;
354 return size;
355}
356static DEVICE_ATTR(wusb_chid, 0600, cbaf_wusb_chid_show, cbaf_wusb_chid_store);
357
358static ssize_t cbaf_wusb_host_name_show(struct device *dev,
359 struct device_attribute *attr,
360 char *buf)
361{
362 struct usb_interface *iface = to_usb_interface(dev);
363 struct cbaf *cbaf = usb_get_intfdata(iface);
364
365 return scnprintf(buf, PAGE_SIZE, "%s\n", cbaf->host_name);
366}
367
368static ssize_t cbaf_wusb_host_name_store(struct device *dev,
369 struct device_attribute *attr,
370 const char *buf, size_t size)
371{
372 ssize_t result;
373 struct usb_interface *iface = to_usb_interface(dev);
374 struct cbaf *cbaf = usb_get_intfdata(iface);
375
376 result = sscanf(buf, "%63s", cbaf->host_name);
377 if (result != 1)
378 return -EINVAL;
379
380 return size;
381}
382static DEVICE_ATTR(wusb_host_name, 0600, cbaf_wusb_host_name_show,
383 cbaf_wusb_host_name_store);
384
385static ssize_t cbaf_wusb_host_band_groups_show(struct device *dev,
386 struct device_attribute *attr,
387 char *buf)
388{
389 struct usb_interface *iface = to_usb_interface(dev);
390 struct cbaf *cbaf = usb_get_intfdata(iface);
391
392 return scnprintf(buf, PAGE_SIZE, "0x%04x\n", cbaf->host_band_groups);
393}
394
395static ssize_t cbaf_wusb_host_band_groups_store(struct device *dev,
396 struct device_attribute *attr,
397 const char *buf, size_t size)
398{
399 ssize_t result;
400 struct usb_interface *iface = to_usb_interface(dev);
401 struct cbaf *cbaf = usb_get_intfdata(iface);
402 u16 band_groups = 0;
403
404 result = sscanf(buf, "%04hx", &band_groups);
405 if (result != 1)
406 return -EINVAL;
407
408 cbaf->host_band_groups = band_groups;
409
410 return size;
411}
412
413static DEVICE_ATTR(wusb_host_band_groups, 0600,
414 cbaf_wusb_host_band_groups_show,
415 cbaf_wusb_host_band_groups_store);
416
417static const struct wusb_cbaf_device_info cbaf_device_info_defaults = {
418 .Length_hdr = WUSB_AR_Length,
419 .CDID_hdr = WUSB_AR_CDID,
420 .BandGroups_hdr = WUSB_AR_BandGroups,
421 .LangID_hdr = WUSB_AR_LangID,
422 .DeviceFriendlyName_hdr = WUSB_AR_DeviceFriendlyName,
423};
424
425static ssize_t cbaf_wusb_cdid_show(struct device *dev,
426 struct device_attribute *attr, char *buf)
427{
428 struct usb_interface *iface = to_usb_interface(dev);
429 struct cbaf *cbaf = usb_get_intfdata(iface);
430 char pr_cdid[WUSB_CKHDID_STRSIZE];
431
432 ckhdid_printf(pr_cdid, sizeof(pr_cdid), &cbaf->cdid);
433 return scnprintf(buf, PAGE_SIZE, "%s\n", pr_cdid);
434}
435
436static ssize_t cbaf_wusb_cdid_store(struct device *dev,
437 struct device_attribute *attr,
438 const char *buf, size_t size)
439{
440 ssize_t result;
441 struct usb_interface *iface = to_usb_interface(dev);
442 struct cbaf *cbaf = usb_get_intfdata(iface);
443 struct wusb_ckhdid cdid;
444
445 result = sscanf(buf,
446 "%02hhx %02hhx %02hhx %02hhx "
447 "%02hhx %02hhx %02hhx %02hhx "
448 "%02hhx %02hhx %02hhx %02hhx "
449 "%02hhx %02hhx %02hhx %02hhx",
450 &cdid.data[0] , &cdid.data[1],
451 &cdid.data[2] , &cdid.data[3],
452 &cdid.data[4] , &cdid.data[5],
453 &cdid.data[6] , &cdid.data[7],
454 &cdid.data[8] , &cdid.data[9],
455 &cdid.data[10], &cdid.data[11],
456 &cdid.data[12], &cdid.data[13],
457 &cdid.data[14], &cdid.data[15]);
458 if (result != 16)
459 return -EINVAL;
460
461 cbaf->cdid = cdid;
462
463 return size;
464}
465static DEVICE_ATTR(wusb_cdid, 0600, cbaf_wusb_cdid_show, cbaf_wusb_cdid_store);
466
467static ssize_t cbaf_wusb_device_band_groups_show(struct device *dev,
468 struct device_attribute *attr,
469 char *buf)
470{
471 struct usb_interface *iface = to_usb_interface(dev);
472 struct cbaf *cbaf = usb_get_intfdata(iface);
473
474 return scnprintf(buf, PAGE_SIZE, "0x%04x\n", cbaf->device_band_groups);
475}
476
477static DEVICE_ATTR(wusb_device_band_groups, 0600,
478 cbaf_wusb_device_band_groups_show,
479 NULL);
480
481static ssize_t cbaf_wusb_device_name_show(struct device *dev,
482 struct device_attribute *attr,
483 char *buf)
484{
485 struct usb_interface *iface = to_usb_interface(dev);
486 struct cbaf *cbaf = usb_get_intfdata(iface);
487
488 return scnprintf(buf, PAGE_SIZE, "%s\n", cbaf->device_name);
489}
490static DEVICE_ATTR(wusb_device_name, 0600, cbaf_wusb_device_name_show, NULL);
491
492static const struct wusb_cbaf_cc_data cbaf_cc_data_defaults = {
493 .AssociationTypeId_hdr = WUSB_AR_AssociationTypeId,
494 .AssociationTypeId = cpu_to_le16(AR_TYPE_WUSB),
495 .AssociationSubTypeId_hdr = WUSB_AR_AssociationSubTypeId,
496 .AssociationSubTypeId = cpu_to_le16(AR_TYPE_WUSB_ASSOCIATE),
497 .Length_hdr = WUSB_AR_Length,
498 .Length = cpu_to_le32(sizeof(struct wusb_cbaf_cc_data)),
499 .ConnectionContext_hdr = WUSB_AR_ConnectionContext,
500 .BandGroups_hdr = WUSB_AR_BandGroups,
501};
502
503static const struct wusb_cbaf_cc_data_fail cbaf_cc_data_fail_defaults = {
504 .AssociationTypeId_hdr = WUSB_AR_AssociationTypeId,
505 .AssociationSubTypeId_hdr = WUSB_AR_AssociationSubTypeId,
506 .Length_hdr = WUSB_AR_Length,
507 .AssociationStatus_hdr = WUSB_AR_AssociationStatus,
508};
509
510/*
511 * Send a new CC to the device.
512 */
513static int cbaf_cc_upload(struct cbaf *cbaf)
514{
515 int result;
516 struct device *dev = &cbaf->usb_iface->dev;
517 struct wusb_cbaf_cc_data *ccd;
518 char pr_cdid[WUSB_CKHDID_STRSIZE];
519
520 ccd = cbaf->buffer;
521 *ccd = cbaf_cc_data_defaults;
522 ccd->CHID = cbaf->chid;
523 ccd->CDID = cbaf->cdid;
524 ccd->CK = cbaf->ck;
525 ccd->BandGroups = cpu_to_le16(cbaf->host_band_groups);
526
527 dev_dbg(dev, "Trying to upload CC:\n");
528 ckhdid_printf(pr_cdid, sizeof(pr_cdid), &ccd->CHID);
529 dev_dbg(dev, " CHID %s\n", pr_cdid);
530 ckhdid_printf(pr_cdid, sizeof(pr_cdid), &ccd->CDID);
531 dev_dbg(dev, " CDID %s\n", pr_cdid);
532 dev_dbg(dev, " Bandgroups 0x%04x\n", cbaf->host_band_groups);
533
534 result = usb_control_msg(
535 cbaf->usb_dev, usb_sndctrlpipe(cbaf->usb_dev, 0),
536 CBAF_REQ_SET_ASSOCIATION_RESPONSE,
537 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
538 0x0201, cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber,
539 ccd, sizeof(*ccd), 1000 /* FIXME: arbitrary */);
540
541 return result;
542}
543
544static ssize_t cbaf_wusb_ck_store(struct device *dev,
545 struct device_attribute *attr,
546 const char *buf, size_t size)
547{
548 ssize_t result;
549 struct usb_interface *iface = to_usb_interface(dev);
550 struct cbaf *cbaf = usb_get_intfdata(iface);
551
552 result = sscanf(buf,
553 "%02hhx %02hhx %02hhx %02hhx "
554 "%02hhx %02hhx %02hhx %02hhx "
555 "%02hhx %02hhx %02hhx %02hhx "
556 "%02hhx %02hhx %02hhx %02hhx",
557 &cbaf->ck.data[0] , &cbaf->ck.data[1],
558 &cbaf->ck.data[2] , &cbaf->ck.data[3],
559 &cbaf->ck.data[4] , &cbaf->ck.data[5],
560 &cbaf->ck.data[6] , &cbaf->ck.data[7],
561 &cbaf->ck.data[8] , &cbaf->ck.data[9],
562 &cbaf->ck.data[10], &cbaf->ck.data[11],
563 &cbaf->ck.data[12], &cbaf->ck.data[13],
564 &cbaf->ck.data[14], &cbaf->ck.data[15]);
565 if (result != 16)
566 return -EINVAL;
567
568 result = cbaf_cc_upload(cbaf);
569 if (result < 0)
570 return result;
571
572 return size;
573}
574static DEVICE_ATTR(wusb_ck, 0600, NULL, cbaf_wusb_ck_store);
575
576static struct attribute *cbaf_dev_attrs[] = {
577 &dev_attr_wusb_host_name.attr,
578 &dev_attr_wusb_host_band_groups.attr,
579 &dev_attr_wusb_chid.attr,
580 &dev_attr_wusb_cdid.attr,
581 &dev_attr_wusb_device_name.attr,
582 &dev_attr_wusb_device_band_groups.attr,
583 &dev_attr_wusb_ck.attr,
584 NULL,
585};
586
587static struct attribute_group cbaf_dev_attr_group = {
588 .name = NULL, /* we want them in the same directory */
589 .attrs = cbaf_dev_attrs,
590};
591
592static int cbaf_probe(struct usb_interface *iface,
593 const struct usb_device_id *id)
594{
595 struct cbaf *cbaf;
596 struct device *dev = &iface->dev;
597 int result = -ENOMEM;
598
599 cbaf = kzalloc(sizeof(*cbaf), GFP_KERNEL);
600 if (cbaf == NULL)
601 goto error_kzalloc;
602 cbaf->buffer = kmalloc(512, GFP_KERNEL);
603 if (cbaf->buffer == NULL)
604 goto error_kmalloc_buffer;
605
606 cbaf->buffer_size = 512;
607 cbaf->usb_dev = usb_get_dev(interface_to_usbdev(iface));
608 cbaf->usb_iface = usb_get_intf(iface);
609 result = cbaf_check(cbaf);
610 if (result < 0) {
611 dev_err(dev, "This device is not WUSB-CBAF compliant"
612 "and is not supported yet.\n");
613 goto error_check;
614 }
615
616 result = sysfs_create_group(&dev->kobj, &cbaf_dev_attr_group);
617 if (result < 0) {
618 dev_err(dev, "Can't register sysfs attr group: %d\n", result);
619 goto error_create_group;
620 }
621 usb_set_intfdata(iface, cbaf);
622 return 0;
623
624error_create_group:
625error_check:
626 kfree(cbaf->buffer);
627error_kmalloc_buffer:
628 kfree(cbaf);
629error_kzalloc:
630 return result;
631}
632
633static void cbaf_disconnect(struct usb_interface *iface)
634{
635 struct cbaf *cbaf = usb_get_intfdata(iface);
636 struct device *dev = &iface->dev;
637 sysfs_remove_group(&dev->kobj, &cbaf_dev_attr_group);
638 usb_set_intfdata(iface, NULL);
639 usb_put_intf(iface);
640 kfree(cbaf->buffer);
641 /* paranoia: clean up crypto keys */
642 memset(cbaf, 0, sizeof(*cbaf));
643 kfree(cbaf);
644}
645
646static struct usb_device_id cbaf_id_table[] = {
647 { USB_INTERFACE_INFO(0xef, 0x03, 0x01), },
648 { },
649};
650MODULE_DEVICE_TABLE(usb, cbaf_id_table);
651
652static struct usb_driver cbaf_driver = {
653 .name = "wusb-cbaf",
654 .id_table = cbaf_id_table,
655 .probe = cbaf_probe,
656 .disconnect = cbaf_disconnect,
657};
658
659static int __init cbaf_driver_init(void)
660{
661 return usb_register(&cbaf_driver);
662}
663module_init(cbaf_driver_init);
664
665static void __exit cbaf_driver_exit(void)
666{
667 usb_deregister(&cbaf_driver);
668}
669module_exit(cbaf_driver_exit);
670
671MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
672MODULE_DESCRIPTION("Wireless USB Cable Based Association");
673MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-29 15:03:01 -0500