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870d5395 IPG |
1 | /* |
2 | * Wireless USB - Cable Based Association | |
3 | * | |
4 | * | |
5 | * Copyright (C) 2006 Intel Corporation | |
6 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> | |
f1fa035f | 7 | * Copyright (C) 2008 Cambridge Silicon Radio Ltd. |
870d5395 IPG |
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 | * | |
f1fa035f | 24 | * WUSB devices have to be paired (associated in WUSB lingo) so |
870d5395 IPG |
25 | * that they can connect to the system. |
26 | * | |
f1fa035f FZ |
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. | |
870d5395 IPG |
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 | * | |
f1fa035f | 45 | * 1. Device plugs, cbaf is loaded, notifications happen. |
870d5395 | 46 | * |
f1fa035f FZ |
47 | * 2. The connection manager (CM) sees a device with CBAF capability |
48 | * (the wusb_chid etc. files in /sys/devices/blah/OURDEVICE). | |
870d5395 | 49 | * |
f1fa035f FZ |
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. | |
870d5395 | 54 | * |
f1fa035f FZ |
55 | * 4. The CM can verify that the device's supported band groups |
56 | * (wusb_device_band_groups) are compatible with the host. | |
870d5395 | 57 | * |
f1fa035f | 58 | * 5. The CM reads the wusb_cdid file. |
870d5395 | 59 | * |
f1fa035f | 60 | * 6. The CM looks up its database |
870d5395 | 61 | * |
f1fa035f FZ |
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. | |
870d5395 | 65 | * |
f1fa035f FZ |
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). | |
870d5395 | 71 | * |
f1fa035f FZ |
72 | * CMD may choose to prompt the user before associating with a new |
73 | * device. | |
870d5395 | 74 | * |
f1fa035f | 75 | * 7. Device is unplugged. |
870d5395 | 76 | * |
f1fa035f FZ |
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. | |
870d5395 | 84 | * |
f1fa035f FZ |
85 | * References: |
86 | * [WUSB-AM] Association Models Supplement to the Certified Wireless | |
87 | * Universal Serial Bus Specification, version 1.0. | |
870d5395 IPG |
88 | */ |
89 | #include <linux/module.h> | |
90 | #include <linux/ctype.h> | |
870d5395 IPG |
91 | #include <linux/usb.h> |
92 | #include <linux/interrupt.h> | |
93 | #include <linux/delay.h> | |
94 | #include <linux/random.h> | |
95 | #include <linux/mutex.h> | |
96 | #include <linux/uwb.h> | |
97 | #include <linux/usb/wusb.h> | |
98 | #include <linux/usb/association.h> | |
99 | ||
f1fa035f | 100 | #define CBA_NAME_LEN 0x40 /* [WUSB-AM] table 4-7 */ |
870d5395 IPG |
101 | |
102 | /* An instance of a Cable-Based-Association-Framework device */ | |
103 | struct cbaf { | |
104 | struct usb_device *usb_dev; | |
105 | struct usb_interface *usb_iface; | |
106 | void *buffer; | |
107 | size_t buffer_size; | |
108 | ||
f1fa035f FZ |
109 | struct wusb_ckhdid chid; |
110 | char host_name[CBA_NAME_LEN]; | |
870d5395 IPG |
111 | u16 host_band_groups; |
112 | ||
f1fa035f FZ |
113 | struct wusb_ckhdid cdid; |
114 | char device_name[CBA_NAME_LEN]; | |
870d5395 | 115 | u16 device_band_groups; |
f1fa035f FZ |
116 | |
117 | struct wusb_ckhdid ck; | |
870d5395 IPG |
118 | }; |
119 | ||
120 | /* | |
121 | * Verify that a CBAF USB-interface has what we need | |
122 | * | |
f1fa035f FZ |
123 | * According to [WUSB-AM], CBA devices should provide at least two |
124 | * interfaces: | |
125 | * - RETRIEVE_HOST_INFO | |
126 | * - ASSOCIATE | |
870d5395 | 127 | * |
f1fa035f FZ |
128 | * If the device doesn't provide these interfaces, we do not know how |
129 | * to deal with it. | |
870d5395 IPG |
130 | */ |
131 | static int cbaf_check(struct cbaf *cbaf) | |
132 | { | |
133 | int result; | |
134 | struct device *dev = &cbaf->usb_iface->dev; | |
135 | struct wusb_cbaf_assoc_info *assoc_info; | |
136 | struct wusb_cbaf_assoc_request *assoc_request; | |
137 | size_t assoc_size; | |
138 | void *itr, *top; | |
f1fa035f | 139 | int ar_rhi = 0, ar_assoc = 0; |
870d5395 IPG |
140 | |
141 | result = usb_control_msg( | |
142 | cbaf->usb_dev, usb_rcvctrlpipe(cbaf->usb_dev, 0), | |
143 | CBAF_REQ_GET_ASSOCIATION_INFORMATION, | |
144 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
145 | 0, cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber, | |
146 | cbaf->buffer, cbaf->buffer_size, 1000 /* FIXME: arbitrary */); | |
147 | if (result < 0) { | |
f1fa035f | 148 | dev_err(dev, "Cannot get available association types: %d\n", |
870d5395 | 149 | result); |
f1fa035f | 150 | return result; |
870d5395 | 151 | } |
f1fa035f | 152 | |
870d5395 IPG |
153 | assoc_info = cbaf->buffer; |
154 | if (result < sizeof(*assoc_info)) { | |
f1fa035f | 155 | dev_err(dev, "Not enough data to decode association info " |
870d5395 IPG |
156 | "header (%zu vs %zu bytes required)\n", |
157 | (size_t)result, sizeof(*assoc_info)); | |
f1fa035f | 158 | return result; |
870d5395 | 159 | } |
f1fa035f | 160 | |
870d5395 IPG |
161 | assoc_size = le16_to_cpu(assoc_info->Length); |
162 | if (result < assoc_size) { | |
f1fa035f | 163 | dev_err(dev, "Not enough data to decode association info " |
870d5395 IPG |
164 | "(%zu vs %zu bytes required)\n", |
165 | (size_t)assoc_size, sizeof(*assoc_info)); | |
f1fa035f | 166 | return result; |
870d5395 IPG |
167 | } |
168 | /* | |
169 | * From now on, we just verify, but won't error out unless we | |
170 | * don't find the AR_TYPE_WUSB_{RETRIEVE_HOST_INFO,ASSOCIATE} | |
171 | * types. | |
172 | */ | |
870d5395 IPG |
173 | itr = cbaf->buffer + sizeof(*assoc_info); |
174 | top = cbaf->buffer + assoc_size; | |
f1fa035f | 175 | dev_dbg(dev, "Found %u association requests (%zu bytes)\n", |
870d5395 | 176 | assoc_info->NumAssociationRequests, assoc_size); |
f1fa035f | 177 | |
870d5395 IPG |
178 | while (itr < top) { |
179 | u16 ar_type, ar_subtype; | |
180 | u32 ar_size; | |
181 | const char *ar_name; | |
182 | ||
183 | assoc_request = itr; | |
f1fa035f | 184 | |
870d5395 | 185 | if (top - itr < sizeof(*assoc_request)) { |
f1fa035f | 186 | dev_err(dev, "Not enough data to decode associaton " |
870d5395 IPG |
187 | "request (%zu vs %zu bytes needed)\n", |
188 | top - itr, sizeof(*assoc_request)); | |
189 | break; | |
190 | } | |
f1fa035f | 191 | |
870d5395 IPG |
192 | ar_type = le16_to_cpu(assoc_request->AssociationTypeId); |
193 | ar_subtype = le16_to_cpu(assoc_request->AssociationSubTypeId); | |
194 | ar_size = le32_to_cpu(assoc_request->AssociationTypeInfoSize); | |
f1fa035f FZ |
195 | ar_name = "unknown"; |
196 | ||
870d5395 IPG |
197 | switch (ar_type) { |
198 | case AR_TYPE_WUSB: | |
f1fa035f | 199 | /* Verify we have what is mandated by [WUSB-AM]. */ |
870d5395 IPG |
200 | switch (ar_subtype) { |
201 | case AR_TYPE_WUSB_RETRIEVE_HOST_INFO: | |
f1fa035f FZ |
202 | ar_name = "RETRIEVE_HOST_INFO"; |
203 | ar_rhi = 1; | |
870d5395 IPG |
204 | break; |
205 | case AR_TYPE_WUSB_ASSOCIATE: | |
206 | /* send assoc data */ | |
f1fa035f FZ |
207 | ar_name = "ASSOCIATE"; |
208 | ar_assoc = 1; | |
870d5395 | 209 | break; |
870d5395 IPG |
210 | }; |
211 | break; | |
870d5395 | 212 | }; |
f1fa035f FZ |
213 | |
214 | dev_dbg(dev, "Association request #%02u: 0x%04x/%04x " | |
870d5395 IPG |
215 | "(%zu bytes): %s\n", |
216 | assoc_request->AssociationDataIndex, ar_type, | |
217 | ar_subtype, (size_t)ar_size, ar_name); | |
218 | ||
219 | itr += sizeof(*assoc_request); | |
870d5395 | 220 | } |
f1fa035f FZ |
221 | |
222 | if (!ar_rhi) { | |
870d5395 IPG |
223 | dev_err(dev, "Missing RETRIEVE_HOST_INFO association " |
224 | "request\n"); | |
f1fa035f | 225 | return -EINVAL; |
870d5395 | 226 | } |
f1fa035f | 227 | if (!ar_assoc) { |
870d5395 | 228 | dev_err(dev, "Missing ASSOCIATE association request\n"); |
f1fa035f | 229 | return -EINVAL; |
870d5395 | 230 | } |
870d5395 | 231 | |
f1fa035f | 232 | return 0; |
870d5395 IPG |
233 | } |
234 | ||
235 | static const struct wusb_cbaf_host_info cbaf_host_info_defaults = { | |
236 | .AssociationTypeId_hdr = WUSB_AR_AssociationTypeId, | |
237 | .AssociationTypeId = cpu_to_le16(AR_TYPE_WUSB), | |
238 | .AssociationSubTypeId_hdr = WUSB_AR_AssociationSubTypeId, | |
239 | .AssociationSubTypeId = cpu_to_le16(AR_TYPE_WUSB_RETRIEVE_HOST_INFO), | |
240 | .CHID_hdr = WUSB_AR_CHID, | |
241 | .LangID_hdr = WUSB_AR_LangID, | |
242 | .HostFriendlyName_hdr = WUSB_AR_HostFriendlyName, | |
243 | }; | |
244 | ||
245 | /* Send WUSB host information (CHID and name) to a CBAF device */ | |
246 | static int cbaf_send_host_info(struct cbaf *cbaf) | |
247 | { | |
248 | struct wusb_cbaf_host_info *hi; | |
f1fa035f | 249 | size_t name_len; |
870d5395 IPG |
250 | size_t hi_size; |
251 | ||
252 | hi = cbaf->buffer; | |
253 | memset(hi, 0, sizeof(*hi)); | |
254 | *hi = cbaf_host_info_defaults; | |
255 | hi->CHID = cbaf->chid; | |
256 | hi->LangID = 0; /* FIXME: I guess... */ | |
f1fa035f FZ |
257 | strlcpy(hi->HostFriendlyName, cbaf->host_name, CBA_NAME_LEN); |
258 | name_len = strlen(cbaf->host_name); | |
259 | hi->HostFriendlyName_hdr.len = cpu_to_le16(name_len); | |
260 | hi_size = sizeof(*hi) + name_len; | |
261 | ||
870d5395 IPG |
262 | return usb_control_msg(cbaf->usb_dev, usb_sndctrlpipe(cbaf->usb_dev, 0), |
263 | CBAF_REQ_SET_ASSOCIATION_RESPONSE, | |
264 | USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
265 | 0x0101, | |
266 | cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber, | |
267 | hi, hi_size, 1000 /* FIXME: arbitrary */); | |
268 | } | |
269 | ||
f1fa035f FZ |
270 | /* |
271 | * Get device's information (CDID) associated to CHID | |
272 | * | |
273 | * The device will return it's information (CDID, name, bandgroups) | |
274 | * associated to the CHID we have set before, or 0 CDID and default | |
275 | * name and bandgroup if no CHID set or unknown. | |
276 | */ | |
277 | static int cbaf_cdid_get(struct cbaf *cbaf) | |
278 | { | |
279 | int result; | |
280 | struct device *dev = &cbaf->usb_iface->dev; | |
281 | struct wusb_cbaf_device_info *di; | |
282 | size_t needed; | |
283 | ||
284 | di = cbaf->buffer; | |
285 | result = usb_control_msg( | |
286 | cbaf->usb_dev, usb_rcvctrlpipe(cbaf->usb_dev, 0), | |
287 | CBAF_REQ_GET_ASSOCIATION_REQUEST, | |
288 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
289 | 0x0200, cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber, | |
290 | di, cbaf->buffer_size, 1000 /* FIXME: arbitrary */); | |
291 | if (result < 0) { | |
292 | dev_err(dev, "Cannot request device information: %d\n", result); | |
293 | return result; | |
294 | } | |
295 | ||
296 | needed = result < sizeof(*di) ? sizeof(*di) : le32_to_cpu(di->Length); | |
297 | if (result < needed) { | |
298 | dev_err(dev, "Not enough data in DEVICE_INFO reply (%zu vs " | |
299 | "%zu bytes needed)\n", (size_t)result, needed); | |
300 | return result; | |
301 | } | |
302 | ||
303 | strlcpy(cbaf->device_name, di->DeviceFriendlyName, CBA_NAME_LEN); | |
304 | cbaf->cdid = di->CDID; | |
305 | cbaf->device_band_groups = le16_to_cpu(di->BandGroups); | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | static ssize_t cbaf_wusb_chid_show(struct device *dev, | |
870d5395 IPG |
311 | struct device_attribute *attr, |
312 | char *buf) | |
313 | { | |
314 | struct usb_interface *iface = to_usb_interface(dev); | |
315 | struct cbaf *cbaf = usb_get_intfdata(iface); | |
316 | char pr_chid[WUSB_CKHDID_STRSIZE]; | |
317 | ||
318 | ckhdid_printf(pr_chid, sizeof(pr_chid), &cbaf->chid); | |
f1fa035f | 319 | return scnprintf(buf, PAGE_SIZE, "%s\n", pr_chid); |
870d5395 IPG |
320 | } |
321 | ||
f1fa035f | 322 | static ssize_t cbaf_wusb_chid_store(struct device *dev, |
870d5395 IPG |
323 | struct device_attribute *attr, |
324 | const char *buf, size_t size) | |
325 | { | |
326 | ssize_t result; | |
327 | struct usb_interface *iface = to_usb_interface(dev); | |
328 | struct cbaf *cbaf = usb_get_intfdata(iface); | |
329 | ||
330 | result = sscanf(buf, | |
331 | "%02hhx %02hhx %02hhx %02hhx " | |
332 | "%02hhx %02hhx %02hhx %02hhx " | |
333 | "%02hhx %02hhx %02hhx %02hhx " | |
f1fa035f | 334 | "%02hhx %02hhx %02hhx %02hhx", |
870d5395 IPG |
335 | &cbaf->chid.data[0] , &cbaf->chid.data[1], |
336 | &cbaf->chid.data[2] , &cbaf->chid.data[3], | |
337 | &cbaf->chid.data[4] , &cbaf->chid.data[5], | |
338 | &cbaf->chid.data[6] , &cbaf->chid.data[7], | |
339 | &cbaf->chid.data[8] , &cbaf->chid.data[9], | |
340 | &cbaf->chid.data[10], &cbaf->chid.data[11], | |
341 | &cbaf->chid.data[12], &cbaf->chid.data[13], | |
f1fa035f FZ |
342 | &cbaf->chid.data[14], &cbaf->chid.data[15]); |
343 | ||
344 | if (result != 16) | |
870d5395 | 345 | return -EINVAL; |
f1fa035f | 346 | |
870d5395 IPG |
347 | result = cbaf_send_host_info(cbaf); |
348 | if (result < 0) | |
f1fa035f FZ |
349 | return result; |
350 | result = cbaf_cdid_get(cbaf); | |
351 | if (result < 0) | |
352 | return -result; | |
353 | return size; | |
354 | } | |
355 | static DEVICE_ATTR(wusb_chid, 0600, cbaf_wusb_chid_show, cbaf_wusb_chid_store); | |
356 | ||
357 | static ssize_t cbaf_wusb_host_name_show(struct device *dev, | |
358 | struct device_attribute *attr, | |
359 | char *buf) | |
360 | { | |
361 | struct usb_interface *iface = to_usb_interface(dev); | |
362 | struct cbaf *cbaf = usb_get_intfdata(iface); | |
363 | ||
364 | return scnprintf(buf, PAGE_SIZE, "%s\n", cbaf->host_name); | |
365 | } | |
366 | ||
367 | static ssize_t cbaf_wusb_host_name_store(struct device *dev, | |
368 | struct device_attribute *attr, | |
369 | const char *buf, size_t size) | |
370 | { | |
371 | ssize_t result; | |
372 | struct usb_interface *iface = to_usb_interface(dev); | |
373 | struct cbaf *cbaf = usb_get_intfdata(iface); | |
374 | ||
375 | result = sscanf(buf, "%63s", cbaf->host_name); | |
376 | if (result != 1) | |
377 | return -EINVAL; | |
378 | ||
379 | return size; | |
380 | } | |
381 | static DEVICE_ATTR(wusb_host_name, 0600, cbaf_wusb_host_name_show, | |
382 | cbaf_wusb_host_name_store); | |
383 | ||
384 | static ssize_t cbaf_wusb_host_band_groups_show(struct device *dev, | |
385 | struct device_attribute *attr, | |
386 | char *buf) | |
387 | { | |
388 | struct usb_interface *iface = to_usb_interface(dev); | |
389 | struct cbaf *cbaf = usb_get_intfdata(iface); | |
390 | ||
391 | return scnprintf(buf, PAGE_SIZE, "0x%04x\n", cbaf->host_band_groups); | |
392 | } | |
393 | ||
394 | static ssize_t cbaf_wusb_host_band_groups_store(struct device *dev, | |
395 | struct device_attribute *attr, | |
396 | const char *buf, size_t size) | |
397 | { | |
398 | ssize_t result; | |
399 | struct usb_interface *iface = to_usb_interface(dev); | |
400 | struct cbaf *cbaf = usb_get_intfdata(iface); | |
401 | u16 band_groups = 0; | |
402 | ||
403 | result = sscanf(buf, "%04hx", &band_groups); | |
404 | if (result != 1) | |
405 | return -EINVAL; | |
406 | ||
407 | cbaf->host_band_groups = band_groups; | |
408 | ||
409 | return size; | |
870d5395 | 410 | } |
f1fa035f FZ |
411 | |
412 | static DEVICE_ATTR(wusb_host_band_groups, 0600, | |
413 | cbaf_wusb_host_band_groups_show, | |
414 | cbaf_wusb_host_band_groups_store); | |
870d5395 IPG |
415 | |
416 | static const struct wusb_cbaf_device_info cbaf_device_info_defaults = { | |
417 | .Length_hdr = WUSB_AR_Length, | |
418 | .CDID_hdr = WUSB_AR_CDID, | |
419 | .BandGroups_hdr = WUSB_AR_BandGroups, | |
420 | .LangID_hdr = WUSB_AR_LangID, | |
421 | .DeviceFriendlyName_hdr = WUSB_AR_DeviceFriendlyName, | |
422 | }; | |
423 | ||
f1fa035f FZ |
424 | static ssize_t cbaf_wusb_cdid_show(struct device *dev, |
425 | struct device_attribute *attr, char *buf) | |
870d5395 | 426 | { |
f1fa035f FZ |
427 | struct usb_interface *iface = to_usb_interface(dev); |
428 | struct cbaf *cbaf = usb_get_intfdata(iface); | |
429 | char pr_cdid[WUSB_CKHDID_STRSIZE]; | |
870d5395 | 430 | |
f1fa035f FZ |
431 | ckhdid_printf(pr_cdid, sizeof(pr_cdid), &cbaf->cdid); |
432 | return scnprintf(buf, PAGE_SIZE, "%s\n", pr_cdid); | |
870d5395 IPG |
433 | } |
434 | ||
f1fa035f FZ |
435 | static ssize_t cbaf_wusb_cdid_store(struct device *dev, |
436 | struct device_attribute *attr, | |
437 | const char *buf, size_t size) | |
870d5395 IPG |
438 | { |
439 | ssize_t result; | |
440 | struct usb_interface *iface = to_usb_interface(dev); | |
441 | struct cbaf *cbaf = usb_get_intfdata(iface); | |
f1fa035f | 442 | struct wusb_ckhdid cdid; |
870d5395 | 443 | |
f1fa035f FZ |
444 | result = sscanf(buf, |
445 | "%02hhx %02hhx %02hhx %02hhx " | |
446 | "%02hhx %02hhx %02hhx %02hhx " | |
447 | "%02hhx %02hhx %02hhx %02hhx " | |
448 | "%02hhx %02hhx %02hhx %02hhx", | |
449 | &cdid.data[0] , &cdid.data[1], | |
450 | &cdid.data[2] , &cdid.data[3], | |
451 | &cdid.data[4] , &cdid.data[5], | |
452 | &cdid.data[6] , &cdid.data[7], | |
453 | &cdid.data[8] , &cdid.data[9], | |
454 | &cdid.data[10], &cdid.data[11], | |
455 | &cdid.data[12], &cdid.data[13], | |
456 | &cdid.data[14], &cdid.data[15]); | |
457 | if (result != 16) | |
458 | return -EINVAL; | |
459 | ||
460 | cbaf->cdid = cdid; | |
461 | ||
462 | return size; | |
463 | } | |
464 | static DEVICE_ATTR(wusb_cdid, 0600, cbaf_wusb_cdid_show, cbaf_wusb_cdid_store); | |
465 | ||
466 | static ssize_t cbaf_wusb_device_band_groups_show(struct device *dev, | |
467 | struct device_attribute *attr, | |
468 | char *buf) | |
469 | { | |
470 | struct usb_interface *iface = to_usb_interface(dev); | |
471 | struct cbaf *cbaf = usb_get_intfdata(iface); | |
472 | ||
473 | return scnprintf(buf, PAGE_SIZE, "0x%04x\n", cbaf->device_band_groups); | |
474 | } | |
475 | ||
476 | static DEVICE_ATTR(wusb_device_band_groups, 0600, | |
477 | cbaf_wusb_device_band_groups_show, | |
478 | NULL); | |
479 | ||
480 | static ssize_t cbaf_wusb_device_name_show(struct device *dev, | |
481 | struct device_attribute *attr, | |
482 | char *buf) | |
483 | { | |
484 | struct usb_interface *iface = to_usb_interface(dev); | |
485 | struct cbaf *cbaf = usb_get_intfdata(iface); | |
486 | ||
487 | return scnprintf(buf, PAGE_SIZE, "%s\n", cbaf->device_name); | |
870d5395 | 488 | } |
f1fa035f | 489 | static DEVICE_ATTR(wusb_device_name, 0600, cbaf_wusb_device_name_show, NULL); |
870d5395 IPG |
490 | |
491 | static const struct wusb_cbaf_cc_data cbaf_cc_data_defaults = { | |
492 | .AssociationTypeId_hdr = WUSB_AR_AssociationTypeId, | |
493 | .AssociationTypeId = cpu_to_le16(AR_TYPE_WUSB), | |
494 | .AssociationSubTypeId_hdr = WUSB_AR_AssociationSubTypeId, | |
495 | .AssociationSubTypeId = cpu_to_le16(AR_TYPE_WUSB_ASSOCIATE), | |
496 | .Length_hdr = WUSB_AR_Length, | |
497 | .Length = cpu_to_le32(sizeof(struct wusb_cbaf_cc_data)), | |
498 | .ConnectionContext_hdr = WUSB_AR_ConnectionContext, | |
499 | .BandGroups_hdr = WUSB_AR_BandGroups, | |
500 | }; | |
501 | ||
502 | static const struct wusb_cbaf_cc_data_fail cbaf_cc_data_fail_defaults = { | |
503 | .AssociationTypeId_hdr = WUSB_AR_AssociationTypeId, | |
504 | .AssociationSubTypeId_hdr = WUSB_AR_AssociationSubTypeId, | |
505 | .Length_hdr = WUSB_AR_Length, | |
506 | .AssociationStatus_hdr = WUSB_AR_AssociationStatus, | |
507 | }; | |
508 | ||
509 | /* | |
f1fa035f | 510 | * Send a new CC to the device. |
870d5395 IPG |
511 | */ |
512 | static int cbaf_cc_upload(struct cbaf *cbaf) | |
513 | { | |
514 | int result; | |
515 | struct device *dev = &cbaf->usb_iface->dev; | |
516 | struct wusb_cbaf_cc_data *ccd; | |
517 | char pr_cdid[WUSB_CKHDID_STRSIZE]; | |
518 | ||
519 | ccd = cbaf->buffer; | |
520 | *ccd = cbaf_cc_data_defaults; | |
521 | ccd->CHID = cbaf->chid; | |
522 | ccd->CDID = cbaf->cdid; | |
523 | ccd->CK = cbaf->ck; | |
524 | ccd->BandGroups = cpu_to_le16(cbaf->host_band_groups); | |
f1fa035f FZ |
525 | |
526 | dev_dbg(dev, "Trying to upload CC:\n"); | |
527 | ckhdid_printf(pr_cdid, sizeof(pr_cdid), &ccd->CHID); | |
528 | dev_dbg(dev, " CHID %s\n", pr_cdid); | |
529 | ckhdid_printf(pr_cdid, sizeof(pr_cdid), &ccd->CDID); | |
530 | dev_dbg(dev, " CDID %s\n", pr_cdid); | |
531 | dev_dbg(dev, " Bandgroups 0x%04x\n", cbaf->host_band_groups); | |
532 | ||
870d5395 IPG |
533 | result = usb_control_msg( |
534 | cbaf->usb_dev, usb_sndctrlpipe(cbaf->usb_dev, 0), | |
535 | CBAF_REQ_SET_ASSOCIATION_RESPONSE, | |
536 | USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
537 | 0x0201, cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber, | |
538 | ccd, sizeof(*ccd), 1000 /* FIXME: arbitrary */); | |
f1fa035f | 539 | |
870d5395 IPG |
540 | return result; |
541 | } | |
542 | ||
f1fa035f | 543 | static ssize_t cbaf_wusb_ck_store(struct device *dev, |
870d5395 IPG |
544 | struct device_attribute *attr, |
545 | const char *buf, size_t size) | |
546 | { | |
547 | ssize_t result; | |
548 | struct usb_interface *iface = to_usb_interface(dev); | |
549 | struct cbaf *cbaf = usb_get_intfdata(iface); | |
550 | ||
551 | result = sscanf(buf, | |
870d5395 | 552 | "%02hhx %02hhx %02hhx %02hhx " |
870d5395 IPG |
553 | "%02hhx %02hhx %02hhx %02hhx " |
554 | "%02hhx %02hhx %02hhx %02hhx " | |
f1fa035f | 555 | "%02hhx %02hhx %02hhx %02hhx", |
870d5395 IPG |
556 | &cbaf->ck.data[0] , &cbaf->ck.data[1], |
557 | &cbaf->ck.data[2] , &cbaf->ck.data[3], | |
558 | &cbaf->ck.data[4] , &cbaf->ck.data[5], | |
559 | &cbaf->ck.data[6] , &cbaf->ck.data[7], | |
560 | &cbaf->ck.data[8] , &cbaf->ck.data[9], | |
561 | &cbaf->ck.data[10], &cbaf->ck.data[11], | |
562 | &cbaf->ck.data[12], &cbaf->ck.data[13], | |
563 | &cbaf->ck.data[14], &cbaf->ck.data[15]); | |
f1fa035f | 564 | if (result != 16) |
870d5395 | 565 | return -EINVAL; |
f1fa035f | 566 | |
870d5395 IPG |
567 | result = cbaf_cc_upload(cbaf); |
568 | if (result < 0) | |
f1fa035f FZ |
569 | return result; |
570 | ||
571 | return size; | |
870d5395 | 572 | } |
f1fa035f | 573 | static DEVICE_ATTR(wusb_ck, 0600, NULL, cbaf_wusb_ck_store); |
870d5395 IPG |
574 | |
575 | static struct attribute *cbaf_dev_attrs[] = { | |
f1fa035f FZ |
576 | &dev_attr_wusb_host_name.attr, |
577 | &dev_attr_wusb_host_band_groups.attr, | |
578 | &dev_attr_wusb_chid.attr, | |
870d5395 | 579 | &dev_attr_wusb_cdid.attr, |
f1fa035f FZ |
580 | &dev_attr_wusb_device_name.attr, |
581 | &dev_attr_wusb_device_band_groups.attr, | |
582 | &dev_attr_wusb_ck.attr, | |
870d5395 IPG |
583 | NULL, |
584 | }; | |
585 | ||
586 | static struct attribute_group cbaf_dev_attr_group = { | |
587 | .name = NULL, /* we want them in the same directory */ | |
588 | .attrs = cbaf_dev_attrs, | |
589 | }; | |
590 | ||
591 | static int cbaf_probe(struct usb_interface *iface, | |
592 | const struct usb_device_id *id) | |
593 | { | |
870d5395 IPG |
594 | struct cbaf *cbaf; |
595 | struct device *dev = &iface->dev; | |
f1fa035f | 596 | int result = -ENOMEM; |
870d5395 | 597 | |
870d5395 | 598 | cbaf = kzalloc(sizeof(*cbaf), GFP_KERNEL); |
f1fa035f | 599 | if (cbaf == NULL) |
870d5395 | 600 | goto error_kzalloc; |
870d5395 IPG |
601 | cbaf->buffer = kmalloc(512, GFP_KERNEL); |
602 | if (cbaf->buffer == NULL) | |
603 | goto error_kmalloc_buffer; | |
f1fa035f | 604 | |
870d5395 IPG |
605 | cbaf->buffer_size = 512; |
606 | cbaf->usb_dev = usb_get_dev(interface_to_usbdev(iface)); | |
607 | cbaf->usb_iface = usb_get_intf(iface); | |
608 | result = cbaf_check(cbaf); | |
f1fa035f FZ |
609 | if (result < 0) { |
610 | dev_err(dev, "This device is not WUSB-CBAF compliant" | |
611 | "and is not supported yet.\n"); | |
870d5395 | 612 | goto error_check; |
f1fa035f FZ |
613 | } |
614 | ||
870d5395 IPG |
615 | result = sysfs_create_group(&dev->kobj, &cbaf_dev_attr_group); |
616 | if (result < 0) { | |
617 | dev_err(dev, "Can't register sysfs attr group: %d\n", result); | |
618 | goto error_create_group; | |
619 | } | |
620 | usb_set_intfdata(iface, cbaf); | |
870d5395 IPG |
621 | return 0; |
622 | ||
623 | error_create_group: | |
624 | error_check: | |
625 | kfree(cbaf->buffer); | |
626 | error_kmalloc_buffer: | |
627 | kfree(cbaf); | |
628 | error_kzalloc: | |
629 | return result; | |
630 | } | |
631 | ||
632 | static void cbaf_disconnect(struct usb_interface *iface) | |
633 | { | |
634 | struct cbaf *cbaf = usb_get_intfdata(iface); | |
635 | struct device *dev = &iface->dev; | |
636 | sysfs_remove_group(&dev->kobj, &cbaf_dev_attr_group); | |
637 | usb_set_intfdata(iface, NULL); | |
638 | usb_put_intf(iface); | |
639 | kfree(cbaf->buffer); | |
640 | /* paranoia: clean up crypto keys */ | |
641 | memset(cbaf, 0, sizeof(*cbaf)); | |
642 | kfree(cbaf); | |
870d5395 IPG |
643 | } |
644 | ||
645 | static struct usb_device_id cbaf_id_table[] = { | |
646 | { USB_INTERFACE_INFO(0xef, 0x03, 0x01), }, | |
647 | { }, | |
648 | }; | |
649 | MODULE_DEVICE_TABLE(usb, cbaf_id_table); | |
650 | ||
651 | static struct usb_driver cbaf_driver = { | |
652 | .name = "wusb-cbaf", | |
653 | .id_table = cbaf_id_table, | |
654 | .probe = cbaf_probe, | |
655 | .disconnect = cbaf_disconnect, | |
656 | }; | |
657 | ||
658 | static int __init cbaf_driver_init(void) | |
659 | { | |
660 | return usb_register(&cbaf_driver); | |
661 | } | |
662 | module_init(cbaf_driver_init); | |
663 | ||
664 | static void __exit cbaf_driver_exit(void) | |
665 | { | |
666 | usb_deregister(&cbaf_driver); | |
667 | } | |
668 | module_exit(cbaf_driver_exit); | |
669 | ||
670 | MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>"); | |
671 | MODULE_DESCRIPTION("Wireless USB Cable Based Association"); | |
672 | MODULE_LICENSE("GPL"); |