Commit | Line | Data |
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b69fada6 IPG |
1 | /* |
2 | * WUSB Wire Adapter: Control/Data Streaming Interface (WUSB[8]) | |
3 | * Device Connect handling | |
4 | * | |
5 | * Copyright (C) 2006 Intel Corporation | |
6 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License version | |
10 | * 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
20 | * 02110-1301, USA. | |
21 | * | |
22 | * | |
23 | * FIXME: docs | |
24 | * FIXME: this file needs to be broken up, it's grown too big | |
25 | * | |
26 | * | |
27 | * WUSB1.0[7.1, 7.5.1, ] | |
28 | * | |
29 | * WUSB device connection is kind of messy. Some background: | |
30 | * | |
31 | * When a device wants to connect it scans the UWB radio channels | |
32 | * looking for a WUSB Channel; a WUSB channel is defined by MMCs | |
33 | * (Micro Managed Commands or something like that) [see | |
34 | * Design-overview for more on this] . | |
35 | * | |
36 | * So, device scans the radio, finds MMCs and thus a host and checks | |
37 | * when the next DNTS is. It sends a Device Notification Connect | |
38 | * (DN_Connect); the host picks it up (through nep.c and notif.c, ends | |
39 | * up in wusb_devconnect_ack(), which creates a wusb_dev structure in | |
40 | * wusbhc->port[port_number].wusb_dev), assigns an unauth address | |
41 | * to the device (this means from 0x80 to 0xfe) and sends, in the MMC | |
42 | * a Connect Ack Information Element (ConnAck IE). | |
43 | * | |
44 | * So now the device now has a WUSB address. From now on, we use | |
45 | * that to talk to it in the RPipes. | |
46 | * | |
47 | * ASSUMPTIONS: | |
48 | * | |
49 | * - We use the the as device address the port number where it is | |
50 | * connected (port 0 doesn't exist). For unauth, it is 128 + that. | |
51 | * | |
52 | * ROADMAP: | |
53 | * | |
54 | * This file contains the logic for doing that--entry points: | |
55 | * | |
56 | * wusb_devconnect_ack() Ack a device until _acked() called. | |
57 | * Called by notif.c:wusb_handle_dn_connect() | |
58 | * when a DN_Connect is received. | |
59 | * | |
60 | * wusbhc_devconnect_auth() Called by rh.c:wusbhc_rh_port_reset() when | |
61 | * doing the device connect sequence. | |
62 | * | |
63 | * wusb_devconnect_acked() Ack done, release resources. | |
64 | * | |
65 | * wusb_handle_dn_alive() Called by notif.c:wusb_handle_dn() | |
66 | * for processing a DN_Alive pong from a device. | |
67 | * | |
68 | * wusb_handle_dn_disconnect()Called by notif.c:wusb_handle_dn() to | |
69 | * process a disconenct request from a | |
70 | * device. | |
71 | * | |
72 | * wusb_dev_reset() Called by rh.c:wusbhc_rh_port_reset() when | |
73 | * resetting a device. | |
74 | * | |
75 | * __wusb_dev_disable() Called by rh.c:wusbhc_rh_clear_port_feat() when | |
76 | * disabling a port. | |
77 | * | |
78 | * wusb_devconnect_create() Called when creating the host by | |
79 | * lc.c:wusbhc_create(). | |
80 | * | |
81 | * wusb_devconnect_destroy() Cleanup called removing the host. Called | |
82 | * by lc.c:wusbhc_destroy(). | |
83 | * | |
84 | * Each Wireless USB host maintains a list of DN_Connect requests | |
85 | * (actually we maintain a list of pending Connect Acks, the | |
86 | * wusbhc->ca_list). | |
87 | * | |
88 | * LIFE CYCLE OF port->wusb_dev | |
89 | * | |
90 | * Before the @wusbhc structure put()s the reference it owns for | |
91 | * port->wusb_dev [and clean the wusb_dev pointer], it needs to | |
92 | * lock @wusbhc->mutex. | |
93 | */ | |
94 | ||
95 | #include <linux/jiffies.h> | |
96 | #include <linux/ctype.h> | |
97 | #include <linux/workqueue.h> | |
98 | #include "wusbhc.h" | |
99 | ||
100 | #undef D_LOCAL | |
101 | #define D_LOCAL 1 | |
102 | #include <linux/uwb/debug.h> | |
103 | ||
104 | static void wusbhc_devconnect_acked_work(struct work_struct *work); | |
105 | ||
106 | static void wusb_dev_free(struct wusb_dev *wusb_dev) | |
107 | { | |
108 | if (wusb_dev) { | |
109 | kfree(wusb_dev->set_gtk_req); | |
110 | usb_free_urb(wusb_dev->set_gtk_urb); | |
111 | kfree(wusb_dev); | |
112 | } | |
113 | } | |
114 | ||
115 | static struct wusb_dev *wusb_dev_alloc(struct wusbhc *wusbhc) | |
116 | { | |
117 | struct wusb_dev *wusb_dev; | |
118 | struct urb *urb; | |
119 | struct usb_ctrlrequest *req; | |
120 | ||
121 | wusb_dev = kzalloc(sizeof(*wusb_dev), GFP_KERNEL); | |
122 | if (wusb_dev == NULL) | |
123 | goto err; | |
124 | ||
125 | wusb_dev->wusbhc = wusbhc; | |
126 | ||
127 | INIT_WORK(&wusb_dev->devconnect_acked_work, wusbhc_devconnect_acked_work); | |
128 | ||
129 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
130 | if (urb == NULL) | |
131 | goto err; | |
132 | ||
133 | req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
134 | if (req == NULL) | |
135 | goto err; | |
136 | ||
137 | req->bRequestType = USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE; | |
138 | req->bRequest = USB_REQ_SET_DESCRIPTOR; | |
139 | req->wValue = cpu_to_le16(USB_DT_KEY << 8 | wusbhc->gtk_index); | |
140 | req->wIndex = 0; | |
141 | req->wLength = cpu_to_le16(wusbhc->gtk.descr.bLength); | |
142 | ||
143 | wusb_dev->set_gtk_urb = urb; | |
144 | wusb_dev->set_gtk_req = req; | |
145 | ||
146 | return wusb_dev; | |
147 | err: | |
148 | wusb_dev_free(wusb_dev); | |
149 | return NULL; | |
150 | } | |
151 | ||
152 | ||
153 | /* | |
154 | * Using the Connect-Ack list, fill out the @wusbhc Connect-Ack WUSB IE | |
155 | * properly so that it can be added to the MMC. | |
156 | * | |
157 | * We just get the @wusbhc->ca_list and fill out the first four ones or | |
158 | * less (per-spec WUSB1.0[7.5, before T7-38). If the ConnectAck WUSB | |
159 | * IE is not allocated, we alloc it. | |
160 | * | |
161 | * @wusbhc->mutex must be taken | |
162 | */ | |
163 | static void wusbhc_fill_cack_ie(struct wusbhc *wusbhc) | |
164 | { | |
165 | unsigned cnt; | |
166 | struct wusb_dev *dev_itr; | |
167 | struct wuie_connect_ack *cack_ie; | |
168 | ||
169 | cack_ie = &wusbhc->cack_ie; | |
170 | cnt = 0; | |
171 | list_for_each_entry(dev_itr, &wusbhc->cack_list, cack_node) { | |
172 | cack_ie->blk[cnt].CDID = dev_itr->cdid; | |
173 | cack_ie->blk[cnt].bDeviceAddress = dev_itr->addr; | |
174 | if (++cnt >= WUIE_ELT_MAX) | |
175 | break; | |
176 | } | |
177 | cack_ie->hdr.bLength = sizeof(cack_ie->hdr) | |
178 | + cnt * sizeof(cack_ie->blk[0]); | |
179 | } | |
180 | ||
181 | /* | |
182 | * Register a new device that wants to connect | |
183 | * | |
184 | * A new device wants to connect, so we add it to the Connect-Ack | |
185 | * list. We give it an address in the unauthorized range (bit 8 set); | |
186 | * user space will have to drive authorization further on. | |
187 | * | |
188 | * @dev_addr: address to use for the device (which is also the port | |
189 | * number). | |
190 | * | |
191 | * @wusbhc->mutex must be taken | |
192 | */ | |
193 | static struct wusb_dev *wusbhc_cack_add(struct wusbhc *wusbhc, | |
194 | struct wusb_dn_connect *dnc, | |
195 | const char *pr_cdid, u8 port_idx) | |
196 | { | |
197 | struct device *dev = wusbhc->dev; | |
198 | struct wusb_dev *wusb_dev; | |
199 | int new_connection = wusb_dn_connect_new_connection(dnc); | |
200 | u8 dev_addr; | |
201 | int result; | |
202 | ||
203 | d_fnstart(3, dev, "(wusbhc %p port_idx %d)\n", wusbhc, port_idx); | |
204 | /* Is it registered already? */ | |
205 | list_for_each_entry(wusb_dev, &wusbhc->cack_list, cack_node) | |
206 | if (!memcmp(&wusb_dev->cdid, &dnc->CDID, | |
207 | sizeof(wusb_dev->cdid))) | |
208 | return wusb_dev; | |
209 | /* We don't have it, create an entry, register it */ | |
210 | wusb_dev = wusb_dev_alloc(wusbhc); | |
211 | if (wusb_dev == NULL) { | |
212 | if (printk_ratelimit()) | |
213 | dev_err(dev, "DN CONNECT: no memory to process %s's %s " | |
214 | "request\n", pr_cdid, | |
215 | new_connection ? "connect" : "reconnect"); | |
216 | return NULL; | |
217 | } | |
218 | wusb_dev_init(wusb_dev); | |
219 | wusb_dev->cdid = dnc->CDID; | |
220 | wusb_dev->port_idx = port_idx; | |
221 | ||
222 | /* | |
223 | * Devices are always available within the cluster reservation | |
224 | * and since the hardware will take the intersection of the | |
225 | * per-device availability and the cluster reservation, the | |
226 | * per-device availability can simply be set to always | |
227 | * available. | |
228 | */ | |
229 | bitmap_fill(wusb_dev->availability.bm, UWB_NUM_MAS); | |
230 | ||
231 | /* FIXME: handle reconnects instead of assuming connects are | |
232 | always new. */ | |
233 | if (1 && new_connection == 0) | |
234 | new_connection = 1; | |
235 | if (new_connection) { | |
236 | dev_addr = (port_idx + 2) | WUSB_DEV_ADDR_UNAUTH; | |
237 | ||
238 | dev_info(dev, "Connecting new WUSB device to address %u, " | |
239 | "port %u\n", dev_addr, port_idx); | |
240 | ||
241 | result = wusb_set_dev_addr(wusbhc, wusb_dev, dev_addr); | |
242 | if (result) | |
243 | return NULL; | |
244 | } | |
245 | wusb_dev->entry_ts = jiffies; | |
246 | list_add_tail(&wusb_dev->cack_node, &wusbhc->cack_list); | |
247 | wusbhc->cack_count++; | |
248 | wusbhc_fill_cack_ie(wusbhc); | |
249 | d_fnend(3, dev, "(wusbhc %p port_idx %d)\n", wusbhc, port_idx); | |
250 | return wusb_dev; | |
251 | } | |
252 | ||
253 | /* | |
254 | * Remove a Connect-Ack context entry from the HCs view | |
255 | * | |
256 | * @wusbhc->mutex must be taken | |
257 | */ | |
258 | static void wusbhc_cack_rm(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) | |
259 | { | |
260 | struct device *dev = wusbhc->dev; | |
261 | d_fnstart(3, dev, "(wusbhc %p wusb_dev %p)\n", wusbhc, wusb_dev); | |
262 | list_del_init(&wusb_dev->cack_node); | |
263 | wusbhc->cack_count--; | |
264 | wusbhc_fill_cack_ie(wusbhc); | |
265 | d_fnend(3, dev, "(wusbhc %p wusb_dev %p) = void\n", wusbhc, wusb_dev); | |
266 | } | |
267 | ||
268 | /* | |
269 | * @wusbhc->mutex must be taken */ | |
270 | static | |
271 | void wusbhc_devconnect_acked(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) | |
272 | { | |
273 | struct device *dev = wusbhc->dev; | |
274 | d_fnstart(3, dev, "(wusbhc %p wusb_dev %p)\n", wusbhc, wusb_dev); | |
275 | wusbhc_cack_rm(wusbhc, wusb_dev); | |
276 | if (wusbhc->cack_count) | |
277 | wusbhc_mmcie_set(wusbhc, 0, 0, &wusbhc->cack_ie.hdr); | |
278 | else | |
279 | wusbhc_mmcie_rm(wusbhc, &wusbhc->cack_ie.hdr); | |
280 | d_fnend(3, dev, "(wusbhc %p wusb_dev %p) = void\n", wusbhc, wusb_dev); | |
281 | } | |
282 | ||
283 | static void wusbhc_devconnect_acked_work(struct work_struct *work) | |
284 | { | |
285 | struct wusb_dev *wusb_dev = container_of(work, struct wusb_dev, | |
286 | devconnect_acked_work); | |
287 | struct wusbhc *wusbhc = wusb_dev->wusbhc; | |
288 | ||
289 | mutex_lock(&wusbhc->mutex); | |
290 | wusbhc_devconnect_acked(wusbhc, wusb_dev); | |
291 | mutex_unlock(&wusbhc->mutex); | |
292 | } | |
293 | ||
294 | /* | |
295 | * Ack a device for connection | |
296 | * | |
297 | * FIXME: docs | |
298 | * | |
299 | * @pr_cdid: Printable CDID...hex Use @dnc->cdid for the real deal. | |
300 | * | |
301 | * So we get the connect ack IE (may have been allocated already), | |
302 | * find an empty connect block, an empty virtual port, create an | |
303 | * address with it (see below), make it an unauth addr [bit 7 set] and | |
304 | * set the MMC. | |
305 | * | |
306 | * Addresses: because WUSB hosts have no downstream hubs, we can do a | |
307 | * 1:1 mapping between 'port number' and device | |
308 | * address. This simplifies many things, as during this | |
309 | * initial connect phase the USB stack has no knoledge of | |
310 | * the device and hasn't assigned an address yet--we know | |
311 | * USB's choose_address() will use the same euristics we | |
312 | * use here, so we can assume which address will be assigned. | |
313 | * | |
314 | * USB stack always assigns address 1 to the root hub, so | |
315 | * to the port number we add 2 (thus virtual port #0 is | |
316 | * addr #2). | |
317 | * | |
318 | * @wusbhc shall be referenced | |
319 | */ | |
320 | static | |
321 | void wusbhc_devconnect_ack(struct wusbhc *wusbhc, struct wusb_dn_connect *dnc, | |
322 | const char *pr_cdid) | |
323 | { | |
324 | int result; | |
325 | struct device *dev = wusbhc->dev; | |
326 | struct wusb_dev *wusb_dev; | |
327 | struct wusb_port *port; | |
328 | unsigned idx, devnum; | |
329 | ||
330 | d_fnstart(3, dev, "(%p, %p, %s)\n", wusbhc, dnc, pr_cdid); | |
331 | mutex_lock(&wusbhc->mutex); | |
332 | ||
333 | /* Check we are not handling it already */ | |
334 | for (idx = 0; idx < wusbhc->ports_max; idx++) { | |
335 | port = wusb_port_by_idx(wusbhc, idx); | |
336 | if (port->wusb_dev | |
337 | && !memcmp(&dnc->CDID, &port->wusb_dev->cdid, | |
338 | sizeof(dnc->CDID))) { | |
339 | if (printk_ratelimit()) | |
340 | dev_err(dev, "Already handling dev %s " | |
341 | " (it might be slow)\n", pr_cdid); | |
342 | goto error_unlock; | |
343 | } | |
344 | } | |
345 | /* Look up those fake ports we have for a free one */ | |
346 | for (idx = 0; idx < wusbhc->ports_max; idx++) { | |
347 | port = wusb_port_by_idx(wusbhc, idx); | |
348 | if ((port->status & USB_PORT_STAT_POWER) | |
349 | && !(port->status & USB_PORT_STAT_CONNECTION)) | |
350 | break; | |
351 | } | |
352 | if (idx >= wusbhc->ports_max) { | |
353 | dev_err(dev, "Host controller can't connect more devices " | |
354 | "(%u already connected); device %s rejected\n", | |
355 | wusbhc->ports_max, pr_cdid); | |
356 | /* NOTE: we could send a WUIE_Disconnect here, but we haven't | |
357 | * event acked, so the device will eventually timeout the | |
358 | * connection, right? */ | |
359 | goto error_unlock; | |
360 | } | |
361 | ||
362 | devnum = idx + 2; | |
363 | ||
364 | /* Make sure we are using no crypto on that "virtual port" */ | |
365 | wusbhc->set_ptk(wusbhc, idx, 0, NULL, 0); | |
366 | ||
367 | /* Grab a filled in Connect-Ack context, fill out the | |
368 | * Connect-Ack Wireless USB IE, set the MMC */ | |
369 | wusb_dev = wusbhc_cack_add(wusbhc, dnc, pr_cdid, idx); | |
370 | if (wusb_dev == NULL) | |
371 | goto error_unlock; | |
372 | result = wusbhc_mmcie_set(wusbhc, 0, 0, &wusbhc->cack_ie.hdr); | |
373 | if (result < 0) | |
374 | goto error_unlock; | |
375 | /* Give the device at least 2ms (WUSB1.0[7.5.1p3]), let's do | |
376 | * three for a good measure */ | |
377 | msleep(3); | |
378 | port->wusb_dev = wusb_dev; | |
379 | port->status |= USB_PORT_STAT_CONNECTION; | |
380 | port->change |= USB_PORT_STAT_C_CONNECTION; | |
381 | port->reset_count = 0; | |
382 | /* Now the port status changed to connected; khubd will | |
383 | * pick the change up and try to reset the port to bring it to | |
384 | * the enabled state--so this process returns up to the stack | |
385 | * and it calls back into wusbhc_rh_port_reset() who will call | |
386 | * devconnect_auth(). | |
387 | */ | |
388 | error_unlock: | |
389 | mutex_unlock(&wusbhc->mutex); | |
390 | d_fnend(3, dev, "(%p, %p, %s) = void\n", wusbhc, dnc, pr_cdid); | |
391 | return; | |
392 | ||
393 | } | |
394 | ||
395 | /* | |
396 | * Disconnect a Wireless USB device from its fake port | |
397 | * | |
398 | * Marks the port as disconnected so that khubd can pick up the change | |
399 | * and drops our knowledge about the device. | |
400 | * | |
401 | * Assumes there is a device connected | |
402 | * | |
403 | * @port_index: zero based port number | |
404 | * | |
405 | * NOTE: @wusbhc->mutex is locked | |
406 | * | |
407 | * WARNING: From here it is not very safe to access anything hanging off | |
408 | * wusb_dev | |
409 | */ | |
410 | static void __wusbhc_dev_disconnect(struct wusbhc *wusbhc, | |
411 | struct wusb_port *port) | |
412 | { | |
413 | struct device *dev = wusbhc->dev; | |
414 | struct wusb_dev *wusb_dev = port->wusb_dev; | |
415 | ||
416 | d_fnstart(3, dev, "(wusbhc %p, port %p)\n", wusbhc, port); | |
417 | port->status &= ~(USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | |
418 | | USB_PORT_STAT_SUSPEND | USB_PORT_STAT_RESET | |
419 | | USB_PORT_STAT_LOW_SPEED | USB_PORT_STAT_HIGH_SPEED); | |
420 | port->change |= USB_PORT_STAT_C_CONNECTION | USB_PORT_STAT_C_ENABLE; | |
421 | if (wusb_dev) { | |
422 | if (!list_empty(&wusb_dev->cack_node)) | |
423 | list_del_init(&wusb_dev->cack_node); | |
424 | /* For the one in cack_add() */ | |
425 | wusb_dev_put(wusb_dev); | |
426 | } | |
427 | port->wusb_dev = NULL; | |
428 | /* don't reset the reset_count to zero or wusbhc_rh_port_reset will get | |
429 | * confused! We only reset to zero when we connect a new device. | |
430 | */ | |
431 | ||
432 | /* After a device disconnects, change the GTK (see [WUSB] | |
433 | * section 6.2.11.2). */ | |
434 | wusbhc_gtk_rekey(wusbhc); | |
435 | ||
436 | d_fnend(3, dev, "(wusbhc %p, port %p) = void\n", wusbhc, port); | |
437 | /* The Wireless USB part has forgotten about the device already; now | |
438 | * khubd's timer will pick up the disconnection and remove the USB | |
439 | * device from the system | |
440 | */ | |
441 | } | |
442 | ||
443 | /* | |
444 | * Authenticate a device into the WUSB Cluster | |
445 | * | |
446 | * Called from the Root Hub code (rh.c:wusbhc_rh_port_reset()) when | |
447 | * asking for a reset on a port that is not enabled (ie: first connect | |
448 | * on the port). | |
449 | * | |
450 | * Performs the 4way handshake to allow the device to comunicate w/ the | |
451 | * WUSB Cluster securely; once done, issue a request to the device for | |
452 | * it to change to address 0. | |
453 | * | |
454 | * This mimics the reset step of Wired USB that once resetting a | |
455 | * device, leaves the port in enabled state and the dev with the | |
456 | * default address (0). | |
457 | * | |
458 | * WUSB1.0[7.1.2] | |
459 | * | |
460 | * @port_idx: port where the change happened--This is the index into | |
461 | * the wusbhc port array, not the USB port number. | |
462 | */ | |
463 | int wusbhc_devconnect_auth(struct wusbhc *wusbhc, u8 port_idx) | |
464 | { | |
465 | struct device *dev = wusbhc->dev; | |
466 | struct wusb_port *port = wusb_port_by_idx(wusbhc, port_idx); | |
467 | ||
468 | d_fnstart(3, dev, "(%p, %u)\n", wusbhc, port_idx); | |
469 | port->status &= ~USB_PORT_STAT_RESET; | |
470 | port->status |= USB_PORT_STAT_ENABLE; | |
471 | port->change |= USB_PORT_STAT_C_RESET | USB_PORT_STAT_C_ENABLE; | |
472 | d_fnend(3, dev, "(%p, %u) = 0\n", wusbhc, port_idx); | |
473 | return 0; | |
474 | } | |
475 | ||
476 | /* | |
477 | * Refresh the list of keep alives to emit in the MMC | |
478 | * | |
479 | * Some devices don't respond to keep alives unless they've been | |
480 | * authenticated, so skip unauthenticated devices. | |
481 | * | |
482 | * We only publish the first four devices that have a coming timeout | |
483 | * condition. Then when we are done processing those, we go for the | |
484 | * next ones. We ignore the ones that have timed out already (they'll | |
485 | * be purged). | |
486 | * | |
487 | * This might cause the first devices to timeout the last devices in | |
488 | * the port array...FIXME: come up with a better algorithm? | |
489 | * | |
490 | * Note we can't do much about MMC's ops errors; we hope next refresh | |
491 | * will kind of handle it. | |
492 | * | |
493 | * NOTE: @wusbhc->mutex is locked | |
494 | */ | |
495 | static void __wusbhc_keep_alive(struct wusbhc *wusbhc) | |
496 | { | |
497 | int result; | |
498 | struct device *dev = wusbhc->dev; | |
499 | unsigned cnt; | |
500 | struct wusb_dev *wusb_dev; | |
501 | struct wusb_port *wusb_port; | |
502 | struct wuie_keep_alive *ie = &wusbhc->keep_alive_ie; | |
503 | unsigned keep_alives, old_keep_alives; | |
504 | ||
505 | d_fnstart(5, dev, "(wusbhc %p)\n", wusbhc); | |
506 | old_keep_alives = ie->hdr.bLength - sizeof(ie->hdr); | |
507 | keep_alives = 0; | |
508 | for (cnt = 0; | |
509 | keep_alives <= WUIE_ELT_MAX && cnt < wusbhc->ports_max; | |
510 | cnt++) { | |
511 | unsigned tt = msecs_to_jiffies(wusbhc->trust_timeout); | |
512 | ||
513 | wusb_port = wusb_port_by_idx(wusbhc, cnt); | |
514 | wusb_dev = wusb_port->wusb_dev; | |
515 | ||
516 | if (wusb_dev == NULL) | |
517 | continue; | |
518 | if (wusb_dev->usb_dev == NULL || !wusb_dev->usb_dev->authenticated) | |
519 | continue; | |
520 | ||
521 | if (time_after(jiffies, wusb_dev->entry_ts + tt)) { | |
522 | dev_err(dev, "KEEPALIVE: device %u timed out\n", | |
523 | wusb_dev->addr); | |
524 | __wusbhc_dev_disconnect(wusbhc, wusb_port); | |
525 | } else if (time_after(jiffies, wusb_dev->entry_ts + tt/2)) { | |
526 | /* Approaching timeout cut out, need to refresh */ | |
527 | ie->bDeviceAddress[keep_alives++] = wusb_dev->addr; | |
528 | } | |
529 | } | |
530 | if (keep_alives & 0x1) /* pad to even number ([WUSB] section 7.5.9) */ | |
531 | ie->bDeviceAddress[keep_alives++] = 0x7f; | |
532 | ie->hdr.bLength = sizeof(ie->hdr) + | |
533 | keep_alives*sizeof(ie->bDeviceAddress[0]); | |
534 | if (keep_alives > 0) { | |
535 | result = wusbhc_mmcie_set(wusbhc, 10, 5, &ie->hdr); | |
536 | if (result < 0 && printk_ratelimit()) | |
537 | dev_err(dev, "KEEPALIVE: can't set MMC: %d\n", result); | |
538 | } else if (old_keep_alives != 0) | |
539 | wusbhc_mmcie_rm(wusbhc, &ie->hdr); | |
540 | d_fnend(5, dev, "(wusbhc %p) = void\n", wusbhc); | |
541 | } | |
542 | ||
543 | /* | |
544 | * Do a run through all devices checking for timeouts | |
545 | */ | |
546 | static void wusbhc_keep_alive_run(struct work_struct *ws) | |
547 | { | |
548 | struct delayed_work *dw = | |
549 | container_of(ws, struct delayed_work, work); | |
550 | struct wusbhc *wusbhc = | |
551 | container_of(dw, struct wusbhc, keep_alive_timer); | |
552 | ||
553 | d_fnstart(5, wusbhc->dev, "(wusbhc %p)\n", wusbhc); | |
554 | if (wusbhc->active) { | |
555 | mutex_lock(&wusbhc->mutex); | |
556 | __wusbhc_keep_alive(wusbhc); | |
557 | mutex_unlock(&wusbhc->mutex); | |
558 | queue_delayed_work(wusbd, &wusbhc->keep_alive_timer, | |
559 | (wusbhc->trust_timeout * CONFIG_HZ)/1000/2); | |
560 | } | |
561 | d_fnend(5, wusbhc->dev, "(wusbhc %p) = void\n", wusbhc); | |
562 | return; | |
563 | } | |
564 | ||
565 | /* | |
566 | * Find the wusb_dev from its device address. | |
567 | * | |
568 | * The device can be found directly from the address (see | |
569 | * wusb_cack_add() for where the device address is set to port_idx | |
570 | * +2), except when the address is zero. | |
571 | */ | |
572 | static struct wusb_dev *wusbhc_find_dev_by_addr(struct wusbhc *wusbhc, u8 addr) | |
573 | { | |
574 | int p; | |
575 | ||
576 | if (addr == 0xff) /* unconnected */ | |
577 | return NULL; | |
578 | ||
579 | if (addr > 0) { | |
580 | int port = (addr & ~0x80) - 2; | |
581 | if (port < 0 || port >= wusbhc->ports_max) | |
582 | return NULL; | |
583 | return wusb_port_by_idx(wusbhc, port)->wusb_dev; | |
584 | } | |
585 | ||
586 | /* Look for the device with address 0. */ | |
587 | for (p = 0; p < wusbhc->ports_max; p++) { | |
588 | struct wusb_dev *wusb_dev = wusb_port_by_idx(wusbhc, p)->wusb_dev; | |
589 | if (wusb_dev && wusb_dev->addr == addr) | |
590 | return wusb_dev; | |
591 | } | |
592 | return NULL; | |
593 | } | |
594 | ||
595 | /* | |
596 | * Handle a DN_Alive notification (WUSB1.0[7.6.1]) | |
597 | * | |
598 | * This just updates the device activity timestamp and then refreshes | |
599 | * the keep alive IE. | |
600 | * | |
601 | * @wusbhc shall be referenced and unlocked | |
602 | */ | |
603 | static void wusbhc_handle_dn_alive(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) | |
604 | { | |
605 | struct device *dev = wusbhc->dev; | |
606 | ||
607 | d_printf(2, dev, "DN ALIVE: device 0x%02x pong\n", wusb_dev->addr); | |
608 | ||
609 | mutex_lock(&wusbhc->mutex); | |
610 | wusb_dev->entry_ts = jiffies; | |
611 | __wusbhc_keep_alive(wusbhc); | |
612 | mutex_unlock(&wusbhc->mutex); | |
613 | } | |
614 | ||
615 | /* | |
616 | * Handle a DN_Connect notification (WUSB1.0[7.6.1]) | |
617 | * | |
618 | * @wusbhc | |
619 | * @pkt_hdr | |
620 | * @size: Size of the buffer where the notification resides; if the | |
621 | * notification data suggests there should be more data than | |
622 | * available, an error will be signaled and the whole buffer | |
623 | * consumed. | |
624 | * | |
625 | * @wusbhc->mutex shall be held | |
626 | */ | |
627 | static void wusbhc_handle_dn_connect(struct wusbhc *wusbhc, | |
628 | struct wusb_dn_hdr *dn_hdr, | |
629 | size_t size) | |
630 | { | |
631 | struct device *dev = wusbhc->dev; | |
632 | struct wusb_dn_connect *dnc; | |
633 | char pr_cdid[WUSB_CKHDID_STRSIZE]; | |
634 | static const char *beacon_behaviour[] = { | |
635 | "reserved", | |
636 | "self-beacon", | |
637 | "directed-beacon", | |
638 | "no-beacon" | |
639 | }; | |
640 | ||
641 | d_fnstart(3, dev, "(%p, %p, %zu)\n", wusbhc, dn_hdr, size); | |
642 | if (size < sizeof(*dnc)) { | |
643 | dev_err(dev, "DN CONNECT: short notification (%zu < %zu)\n", | |
644 | size, sizeof(*dnc)); | |
645 | goto out; | |
646 | } | |
647 | ||
648 | dnc = container_of(dn_hdr, struct wusb_dn_connect, hdr); | |
649 | ckhdid_printf(pr_cdid, sizeof(pr_cdid), &dnc->CDID); | |
650 | dev_info(dev, "DN CONNECT: device %s @ %x (%s) wants to %s\n", | |
651 | pr_cdid, | |
652 | wusb_dn_connect_prev_dev_addr(dnc), | |
653 | beacon_behaviour[wusb_dn_connect_beacon_behavior(dnc)], | |
654 | wusb_dn_connect_new_connection(dnc) ? "connect" : "reconnect"); | |
655 | /* ACK the connect */ | |
656 | wusbhc_devconnect_ack(wusbhc, dnc, pr_cdid); | |
657 | out: | |
658 | d_fnend(3, dev, "(%p, %p, %zu) = void\n", | |
659 | wusbhc, dn_hdr, size); | |
660 | return; | |
661 | } | |
662 | ||
663 | /* | |
664 | * Handle a DN_Disconnect notification (WUSB1.0[7.6.1]) | |
665 | * | |
666 | * Device is going down -- do the disconnect. | |
667 | * | |
668 | * @wusbhc shall be referenced and unlocked | |
669 | */ | |
670 | static void wusbhc_handle_dn_disconnect(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) | |
671 | { | |
672 | struct device *dev = wusbhc->dev; | |
673 | ||
674 | dev_info(dev, "DN DISCONNECT: device 0x%02x going down\n", wusb_dev->addr); | |
675 | ||
676 | mutex_lock(&wusbhc->mutex); | |
677 | __wusbhc_dev_disconnect(wusbhc, wusb_port_by_idx(wusbhc, wusb_dev->port_idx)); | |
678 | mutex_unlock(&wusbhc->mutex); | |
679 | } | |
680 | ||
681 | /* | |
682 | * Reset a WUSB device on a HWA | |
683 | * | |
684 | * @wusbhc | |
685 | * @port_idx Index of the port where the device is | |
686 | * | |
687 | * In Wireless USB, a reset is more or less equivalent to a full | |
688 | * disconnect; so we just do a full disconnect and send the device a | |
689 | * Device Reset IE (WUSB1.0[7.5.11]) giving it a few millisecs (6 MMCs). | |
690 | * | |
691 | * @wusbhc should be refcounted and unlocked | |
692 | */ | |
693 | int wusbhc_dev_reset(struct wusbhc *wusbhc, u8 port_idx) | |
694 | { | |
695 | int result; | |
696 | struct device *dev = wusbhc->dev; | |
697 | struct wusb_dev *wusb_dev; | |
698 | struct wuie_reset *ie; | |
699 | ||
700 | d_fnstart(3, dev, "(%p, %u)\n", wusbhc, port_idx); | |
701 | mutex_lock(&wusbhc->mutex); | |
702 | result = 0; | |
703 | wusb_dev = wusb_port_by_idx(wusbhc, port_idx)->wusb_dev; | |
704 | if (wusb_dev == NULL) { | |
705 | /* reset no device? ignore */ | |
706 | dev_dbg(dev, "RESET: no device at port %u, ignoring\n", | |
707 | port_idx); | |
708 | goto error_unlock; | |
709 | } | |
710 | result = -ENOMEM; | |
711 | ie = kzalloc(sizeof(*ie), GFP_KERNEL); | |
712 | if (ie == NULL) | |
713 | goto error_unlock; | |
714 | ie->hdr.bLength = sizeof(ie->hdr) + sizeof(ie->CDID); | |
715 | ie->hdr.bIEIdentifier = WUIE_ID_RESET_DEVICE; | |
716 | ie->CDID = wusb_dev->cdid; | |
717 | result = wusbhc_mmcie_set(wusbhc, 0xff, 6, &ie->hdr); | |
718 | if (result < 0) { | |
719 | dev_err(dev, "RESET: cant's set MMC: %d\n", result); | |
720 | goto error_kfree; | |
721 | } | |
722 | __wusbhc_dev_disconnect(wusbhc, wusb_port_by_idx(wusbhc, port_idx)); | |
723 | ||
724 | /* 120ms, hopefully 6 MMCs (FIXME) */ | |
725 | msleep(120); | |
726 | wusbhc_mmcie_rm(wusbhc, &ie->hdr); | |
727 | error_kfree: | |
728 | kfree(ie); | |
729 | error_unlock: | |
730 | mutex_unlock(&wusbhc->mutex); | |
731 | d_fnend(3, dev, "(%p, %u) = %d\n", wusbhc, port_idx, result); | |
732 | return result; | |
733 | } | |
734 | ||
735 | /* | |
736 | * Handle a Device Notification coming a host | |
737 | * | |
738 | * The Device Notification comes from a host (HWA, DWA or WHCI) | |
739 | * wrapped in a set of headers. Somebody else has peeled off those | |
740 | * headers for us and we just get one Device Notifications. | |
741 | * | |
742 | * Invalid DNs (e.g., too short) are discarded. | |
743 | * | |
744 | * @wusbhc shall be referenced | |
745 | * | |
746 | * FIXMES: | |
747 | * - implement priorities as in WUSB1.0[Table 7-55]? | |
748 | */ | |
749 | void wusbhc_handle_dn(struct wusbhc *wusbhc, u8 srcaddr, | |
750 | struct wusb_dn_hdr *dn_hdr, size_t size) | |
751 | { | |
752 | struct device *dev = wusbhc->dev; | |
753 | struct wusb_dev *wusb_dev; | |
754 | ||
755 | d_fnstart(3, dev, "(%p, %p)\n", wusbhc, dn_hdr); | |
756 | ||
757 | if (size < sizeof(struct wusb_dn_hdr)) { | |
758 | dev_err(dev, "DN data shorter than DN header (%d < %d)\n", | |
759 | (int)size, (int)sizeof(struct wusb_dn_hdr)); | |
760 | goto out; | |
761 | } | |
762 | ||
763 | wusb_dev = wusbhc_find_dev_by_addr(wusbhc, srcaddr); | |
764 | if (wusb_dev == NULL && dn_hdr->bType != WUSB_DN_CONNECT) { | |
765 | dev_dbg(dev, "ignoring DN %d from unconnected device %02x\n", | |
766 | dn_hdr->bType, srcaddr); | |
767 | goto out; | |
768 | } | |
769 | ||
770 | switch (dn_hdr->bType) { | |
771 | case WUSB_DN_CONNECT: | |
772 | wusbhc_handle_dn_connect(wusbhc, dn_hdr, size); | |
773 | break; | |
774 | case WUSB_DN_ALIVE: | |
775 | wusbhc_handle_dn_alive(wusbhc, wusb_dev); | |
776 | break; | |
777 | case WUSB_DN_DISCONNECT: | |
778 | wusbhc_handle_dn_disconnect(wusbhc, wusb_dev); | |
779 | break; | |
780 | case WUSB_DN_MASAVAILCHANGED: | |
781 | case WUSB_DN_RWAKE: | |
782 | case WUSB_DN_SLEEP: | |
783 | /* FIXME: handle these DNs. */ | |
784 | break; | |
785 | case WUSB_DN_EPRDY: | |
786 | /* The hardware handles these. */ | |
787 | break; | |
788 | default: | |
789 | dev_warn(dev, "unknown DN %u (%d octets) from %u\n", | |
790 | dn_hdr->bType, (int)size, srcaddr); | |
791 | } | |
792 | out: | |
793 | d_fnend(3, dev, "(%p, %p) = void\n", wusbhc, dn_hdr); | |
794 | return; | |
795 | } | |
796 | EXPORT_SYMBOL_GPL(wusbhc_handle_dn); | |
797 | ||
798 | /* | |
799 | * Disconnect a WUSB device from a the cluster | |
800 | * | |
801 | * @wusbhc | |
802 | * @port Fake port where the device is (wusbhc index, not USB port number). | |
803 | * | |
804 | * In Wireless USB, a disconnect is basically telling the device he is | |
805 | * being disconnected and forgetting about him. | |
806 | * | |
807 | * We send the device a Device Disconnect IE (WUSB1.0[7.5.11]) for 100 | |
808 | * ms and then keep going. | |
809 | * | |
810 | * We don't do much in case of error; we always pretend we disabled | |
811 | * the port and disconnected the device. If physically the request | |
812 | * didn't get there (many things can fail in the way there), the stack | |
813 | * will reject the device's communication attempts. | |
814 | * | |
815 | * @wusbhc should be refcounted and locked | |
816 | */ | |
817 | void __wusbhc_dev_disable(struct wusbhc *wusbhc, u8 port_idx) | |
818 | { | |
819 | int result; | |
820 | struct device *dev = wusbhc->dev; | |
821 | struct wusb_dev *wusb_dev; | |
822 | struct wuie_disconnect *ie; | |
823 | ||
824 | d_fnstart(3, dev, "(%p, %u)\n", wusbhc, port_idx); | |
825 | result = 0; | |
826 | wusb_dev = wusb_port_by_idx(wusbhc, port_idx)->wusb_dev; | |
827 | if (wusb_dev == NULL) { | |
828 | /* reset no device? ignore */ | |
829 | dev_dbg(dev, "DISCONNECT: no device at port %u, ignoring\n", | |
830 | port_idx); | |
831 | goto error; | |
832 | } | |
833 | __wusbhc_dev_disconnect(wusbhc, wusb_port_by_idx(wusbhc, port_idx)); | |
834 | ||
835 | result = -ENOMEM; | |
836 | ie = kzalloc(sizeof(*ie), GFP_KERNEL); | |
837 | if (ie == NULL) | |
838 | goto error; | |
839 | ie->hdr.bLength = sizeof(*ie); | |
840 | ie->hdr.bIEIdentifier = WUIE_ID_DEVICE_DISCONNECT; | |
841 | ie->bDeviceAddress = wusb_dev->addr; | |
842 | result = wusbhc_mmcie_set(wusbhc, 0, 0, &ie->hdr); | |
843 | if (result < 0) { | |
844 | dev_err(dev, "DISCONNECT: can't set MMC: %d\n", result); | |
845 | goto error_kfree; | |
846 | } | |
847 | ||
848 | /* 120ms, hopefully 6 MMCs */ | |
849 | msleep(100); | |
850 | wusbhc_mmcie_rm(wusbhc, &ie->hdr); | |
851 | error_kfree: | |
852 | kfree(ie); | |
853 | error: | |
854 | d_fnend(3, dev, "(%p, %u) = %d\n", wusbhc, port_idx, result); | |
855 | return; | |
856 | } | |
857 | ||
858 | static void wusb_cap_descr_printf(const unsigned level, struct device *dev, | |
859 | const struct usb_wireless_cap_descriptor *wcd) | |
860 | { | |
861 | d_printf(level, dev, | |
862 | "WUSB Capability Descriptor\n" | |
863 | " bDevCapabilityType 0x%02x\n" | |
864 | " bmAttributes 0x%02x\n" | |
865 | " wPhyRates 0x%04x\n" | |
866 | " bmTFITXPowerInfo 0x%02x\n" | |
867 | " bmFFITXPowerInfo 0x%02x\n" | |
868 | " bmBandGroup 0x%04x\n" | |
869 | " bReserved 0x%02x\n", | |
870 | wcd->bDevCapabilityType, | |
871 | wcd->bmAttributes, | |
872 | le16_to_cpu(wcd->wPHYRates), | |
873 | wcd->bmTFITXPowerInfo, | |
874 | wcd->bmFFITXPowerInfo, | |
875 | wcd->bmBandGroup, | |
876 | wcd->bReserved); | |
877 | } | |
878 | ||
879 | /* | |
880 | * Walk over the BOS descriptor, verify and grok it | |
881 | * | |
882 | * @usb_dev: referenced | |
883 | * @wusb_dev: referenced and unlocked | |
884 | * | |
885 | * The BOS descriptor is defined at WUSB1.0[7.4.1], and it defines a | |
886 | * "flexible" way to wrap all kinds of descriptors inside an standard | |
887 | * descriptor (wonder why they didn't use normal descriptors, | |
888 | * btw). Not like they lack code. | |
889 | * | |
890 | * At the end we go to look for the WUSB Device Capabilities | |
891 | * (WUSB1.0[7.4.1.1]) that is wrapped in a device capability descriptor | |
892 | * that is part of the BOS descriptor set. That tells us what does the | |
893 | * device support (dual role, beacon type, UWB PHY rates). | |
894 | */ | |
895 | static int wusb_dev_bos_grok(struct usb_device *usb_dev, | |
896 | struct wusb_dev *wusb_dev, | |
897 | struct usb_bos_descriptor *bos, size_t desc_size) | |
898 | { | |
899 | ssize_t result; | |
900 | struct device *dev = &usb_dev->dev; | |
901 | void *itr, *top; | |
902 | ||
903 | /* Walk over BOS capabilities, verify them */ | |
904 | itr = (void *)bos + sizeof(*bos); | |
905 | top = itr + desc_size - sizeof(*bos); | |
906 | while (itr < top) { | |
907 | struct usb_dev_cap_header *cap_hdr = itr; | |
908 | size_t cap_size; | |
909 | u8 cap_type; | |
910 | if (top - itr < sizeof(*cap_hdr)) { | |
911 | dev_err(dev, "Device BUG? premature end of BOS header " | |
912 | "data [offset 0x%02x]: only %zu bytes left\n", | |
913 | (int)(itr - (void *)bos), top - itr); | |
914 | result = -ENOSPC; | |
915 | goto error_bad_cap; | |
916 | } | |
917 | cap_size = cap_hdr->bLength; | |
918 | cap_type = cap_hdr->bDevCapabilityType; | |
919 | d_printf(4, dev, "BOS Capability: 0x%02x (%zu bytes)\n", | |
920 | cap_type, cap_size); | |
921 | if (cap_size == 0) | |
922 | break; | |
923 | if (cap_size > top - itr) { | |
924 | dev_err(dev, "Device BUG? premature end of BOS data " | |
925 | "[offset 0x%02x cap %02x %zu bytes]: " | |
926 | "only %zu bytes left\n", | |
927 | (int)(itr - (void *)bos), | |
928 | cap_type, cap_size, top - itr); | |
929 | result = -EBADF; | |
930 | goto error_bad_cap; | |
931 | } | |
932 | d_dump(3, dev, itr, cap_size); | |
933 | switch (cap_type) { | |
934 | case USB_CAP_TYPE_WIRELESS_USB: | |
935 | if (cap_size != sizeof(*wusb_dev->wusb_cap_descr)) | |
936 | dev_err(dev, "Device BUG? WUSB Capability " | |
937 | "descriptor is %zu bytes vs %zu " | |
938 | "needed\n", cap_size, | |
939 | sizeof(*wusb_dev->wusb_cap_descr)); | |
940 | else { | |
941 | wusb_dev->wusb_cap_descr = itr; | |
942 | wusb_cap_descr_printf(3, dev, itr); | |
943 | } | |
944 | break; | |
945 | default: | |
946 | dev_err(dev, "BUG? Unknown BOS capability 0x%02x " | |
947 | "(%zu bytes) at offset 0x%02x\n", cap_type, | |
948 | cap_size, (int)(itr - (void *)bos)); | |
949 | } | |
950 | itr += cap_size; | |
951 | } | |
952 | result = 0; | |
953 | error_bad_cap: | |
954 | return result; | |
955 | } | |
956 | ||
957 | /* | |
958 | * Add information from the BOS descriptors to the device | |
959 | * | |
960 | * @usb_dev: referenced | |
961 | * @wusb_dev: referenced and unlocked | |
962 | * | |
963 | * So what we do is we alloc a space for the BOS descriptor of 64 | |
964 | * bytes; read the first four bytes which include the wTotalLength | |
965 | * field (WUSB1.0[T7-26]) and if it fits in those 64 bytes, read the | |
966 | * whole thing. If not we realloc to that size. | |
967 | * | |
968 | * Then we call the groking function, that will fill up | |
969 | * wusb_dev->wusb_cap_descr, which is what we'll need later on. | |
970 | */ | |
971 | static int wusb_dev_bos_add(struct usb_device *usb_dev, | |
972 | struct wusb_dev *wusb_dev) | |
973 | { | |
974 | ssize_t result; | |
975 | struct device *dev = &usb_dev->dev; | |
976 | struct usb_bos_descriptor *bos; | |
977 | size_t alloc_size = 32, desc_size = 4; | |
978 | ||
979 | bos = kmalloc(alloc_size, GFP_KERNEL); | |
980 | if (bos == NULL) | |
981 | return -ENOMEM; | |
982 | result = usb_get_descriptor(usb_dev, USB_DT_BOS, 0, bos, desc_size); | |
983 | if (result < 4) { | |
984 | dev_err(dev, "Can't get BOS descriptor or too short: %zd\n", | |
985 | result); | |
986 | goto error_get_descriptor; | |
987 | } | |
988 | desc_size = le16_to_cpu(bos->wTotalLength); | |
989 | if (desc_size >= alloc_size) { | |
990 | kfree(bos); | |
991 | alloc_size = desc_size; | |
992 | bos = kmalloc(alloc_size, GFP_KERNEL); | |
993 | if (bos == NULL) | |
994 | return -ENOMEM; | |
995 | } | |
996 | result = usb_get_descriptor(usb_dev, USB_DT_BOS, 0, bos, desc_size); | |
997 | if (result < 0 || result != desc_size) { | |
998 | dev_err(dev, "Can't get BOS descriptor or too short (need " | |
999 | "%zu bytes): %zd\n", desc_size, result); | |
1000 | goto error_get_descriptor; | |
1001 | } | |
1002 | if (result < sizeof(*bos) | |
1003 | || le16_to_cpu(bos->wTotalLength) != desc_size) { | |
1004 | dev_err(dev, "Can't get BOS descriptor or too short (need " | |
1005 | "%zu bytes): %zd\n", desc_size, result); | |
1006 | goto error_get_descriptor; | |
1007 | } | |
1008 | d_printf(2, dev, "Got BOS descriptor %zd bytes, %u capabilities\n", | |
1009 | result, bos->bNumDeviceCaps); | |
1010 | d_dump(2, dev, bos, result); | |
1011 | result = wusb_dev_bos_grok(usb_dev, wusb_dev, bos, result); | |
1012 | if (result < 0) | |
1013 | goto error_bad_bos; | |
1014 | wusb_dev->bos = bos; | |
1015 | return 0; | |
1016 | ||
1017 | error_bad_bos: | |
1018 | error_get_descriptor: | |
1019 | kfree(bos); | |
1020 | wusb_dev->wusb_cap_descr = NULL; | |
1021 | return result; | |
1022 | } | |
1023 | ||
1024 | static void wusb_dev_bos_rm(struct wusb_dev *wusb_dev) | |
1025 | { | |
1026 | kfree(wusb_dev->bos); | |
1027 | wusb_dev->wusb_cap_descr = NULL; | |
1028 | }; | |
1029 | ||
1030 | static struct usb_wireless_cap_descriptor wusb_cap_descr_default = { | |
1031 | .bLength = sizeof(wusb_cap_descr_default), | |
1032 | .bDescriptorType = USB_DT_DEVICE_CAPABILITY, | |
1033 | .bDevCapabilityType = USB_CAP_TYPE_WIRELESS_USB, | |
1034 | ||
1035 | .bmAttributes = USB_WIRELESS_BEACON_NONE, | |
1036 | .wPHYRates = cpu_to_le16(USB_WIRELESS_PHY_53), | |
1037 | .bmTFITXPowerInfo = 0, | |
1038 | .bmFFITXPowerInfo = 0, | |
1039 | .bmBandGroup = cpu_to_le16(0x0001), /* WUSB1.0[7.4.1] bottom */ | |
1040 | .bReserved = 0 | |
1041 | }; | |
1042 | ||
1043 | /* | |
1044 | * USB stack's device addition Notifier Callback | |
1045 | * | |
1046 | * Called from drivers/usb/core/hub.c when a new device is added; we | |
1047 | * use this hook to perform certain WUSB specific setup work on the | |
1048 | * new device. As well, it is the first time we can connect the | |
1049 | * wusb_dev and the usb_dev. So we note it down in wusb_dev and take a | |
1050 | * reference that we'll drop. | |
1051 | * | |
1052 | * First we need to determine if the device is a WUSB device (else we | |
1053 | * ignore it). For that we use the speed setting (USB_SPEED_VARIABLE) | |
1054 | * [FIXME: maybe we'd need something more definitive]. If so, we track | |
1055 | * it's usb_busd and from there, the WUSB HC. | |
1056 | * | |
1057 | * Because all WUSB HCs are contained in a 'struct wusbhc', voila, we | |
1058 | * get the wusbhc for the device. | |
1059 | * | |
1060 | * We have a reference on @usb_dev (as we are called at the end of its | |
1061 | * enumeration). | |
1062 | * | |
1063 | * NOTE: @usb_dev locked | |
1064 | */ | |
1065 | static void wusb_dev_add_ncb(struct usb_device *usb_dev) | |
1066 | { | |
1067 | int result = 0; | |
1068 | struct wusb_dev *wusb_dev; | |
1069 | struct wusbhc *wusbhc; | |
1070 | struct device *dev = &usb_dev->dev; | |
1071 | u8 port_idx; | |
1072 | ||
1073 | if (usb_dev->wusb == 0 || usb_dev->devnum == 1) | |
1074 | return; /* skip non wusb and wusb RHs */ | |
1075 | ||
1076 | d_fnstart(3, dev, "(usb_dev %p)\n", usb_dev); | |
1077 | ||
1078 | wusbhc = wusbhc_get_by_usb_dev(usb_dev); | |
1079 | if (wusbhc == NULL) | |
1080 | goto error_nodev; | |
1081 | mutex_lock(&wusbhc->mutex); | |
1082 | wusb_dev = __wusb_dev_get_by_usb_dev(wusbhc, usb_dev); | |
1083 | port_idx = wusb_port_no_to_idx(usb_dev->portnum); | |
1084 | mutex_unlock(&wusbhc->mutex); | |
1085 | if (wusb_dev == NULL) | |
1086 | goto error_nodev; | |
1087 | wusb_dev->usb_dev = usb_get_dev(usb_dev); | |
1088 | usb_dev->wusb_dev = wusb_dev_get(wusb_dev); | |
1089 | result = wusb_dev_sec_add(wusbhc, usb_dev, wusb_dev); | |
1090 | if (result < 0) { | |
1091 | dev_err(dev, "Cannot enable security: %d\n", result); | |
1092 | goto error_sec_add; | |
1093 | } | |
1094 | /* Now query the device for it's BOS and attach it to wusb_dev */ | |
1095 | result = wusb_dev_bos_add(usb_dev, wusb_dev); | |
1096 | if (result < 0) { | |
1097 | dev_err(dev, "Cannot get BOS descriptors: %d\n", result); | |
1098 | goto error_bos_add; | |
1099 | } | |
1100 | result = wusb_dev_sysfs_add(wusbhc, usb_dev, wusb_dev); | |
1101 | if (result < 0) | |
1102 | goto error_add_sysfs; | |
1103 | out: | |
1104 | wusb_dev_put(wusb_dev); | |
1105 | wusbhc_put(wusbhc); | |
1106 | error_nodev: | |
1107 | d_fnend(3, dev, "(usb_dev %p) = void\n", usb_dev); | |
1108 | return; | |
1109 | ||
1110 | wusb_dev_sysfs_rm(wusb_dev); | |
1111 | error_add_sysfs: | |
1112 | wusb_dev_bos_rm(wusb_dev); | |
1113 | error_bos_add: | |
1114 | wusb_dev_sec_rm(wusb_dev); | |
1115 | error_sec_add: | |
1116 | mutex_lock(&wusbhc->mutex); | |
1117 | __wusbhc_dev_disconnect(wusbhc, wusb_port_by_idx(wusbhc, port_idx)); | |
1118 | mutex_unlock(&wusbhc->mutex); | |
1119 | goto out; | |
1120 | } | |
1121 | ||
1122 | /* | |
1123 | * Undo all the steps done at connection by the notifier callback | |
1124 | * | |
1125 | * NOTE: @usb_dev locked | |
1126 | */ | |
1127 | static void wusb_dev_rm_ncb(struct usb_device *usb_dev) | |
1128 | { | |
1129 | struct wusb_dev *wusb_dev = usb_dev->wusb_dev; | |
1130 | ||
1131 | if (usb_dev->wusb == 0 || usb_dev->devnum == 1) | |
1132 | return; /* skip non wusb and wusb RHs */ | |
1133 | ||
1134 | wusb_dev_sysfs_rm(wusb_dev); | |
1135 | wusb_dev_bos_rm(wusb_dev); | |
1136 | wusb_dev_sec_rm(wusb_dev); | |
1137 | wusb_dev->usb_dev = NULL; | |
1138 | usb_dev->wusb_dev = NULL; | |
1139 | wusb_dev_put(wusb_dev); | |
1140 | usb_put_dev(usb_dev); | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * Handle notifications from the USB stack (notifier call back) | |
1145 | * | |
1146 | * This is called when the USB stack does a | |
1147 | * usb_{bus,device}_{add,remove}() so we can do WUSB specific | |
1148 | * handling. It is called with [for the case of | |
1149 | * USB_DEVICE_{ADD,REMOVE} with the usb_dev locked. | |
1150 | */ | |
1151 | int wusb_usb_ncb(struct notifier_block *nb, unsigned long val, | |
1152 | void *priv) | |
1153 | { | |
1154 | int result = NOTIFY_OK; | |
1155 | ||
1156 | switch (val) { | |
1157 | case USB_DEVICE_ADD: | |
1158 | wusb_dev_add_ncb(priv); | |
1159 | break; | |
1160 | case USB_DEVICE_REMOVE: | |
1161 | wusb_dev_rm_ncb(priv); | |
1162 | break; | |
1163 | case USB_BUS_ADD: | |
1164 | /* ignore (for now) */ | |
1165 | case USB_BUS_REMOVE: | |
1166 | break; | |
1167 | default: | |
1168 | WARN_ON(1); | |
1169 | result = NOTIFY_BAD; | |
1170 | }; | |
1171 | return result; | |
1172 | } | |
1173 | ||
1174 | /* | |
1175 | * Return a referenced wusb_dev given a @wusbhc and @usb_dev | |
1176 | */ | |
1177 | struct wusb_dev *__wusb_dev_get_by_usb_dev(struct wusbhc *wusbhc, | |
1178 | struct usb_device *usb_dev) | |
1179 | { | |
1180 | struct wusb_dev *wusb_dev; | |
1181 | u8 port_idx; | |
1182 | ||
1183 | port_idx = wusb_port_no_to_idx(usb_dev->portnum); | |
1184 | BUG_ON(port_idx > wusbhc->ports_max); | |
1185 | wusb_dev = wusb_port_by_idx(wusbhc, port_idx)->wusb_dev; | |
1186 | if (wusb_dev != NULL) /* ops, device is gone */ | |
1187 | wusb_dev_get(wusb_dev); | |
1188 | return wusb_dev; | |
1189 | } | |
1190 | EXPORT_SYMBOL_GPL(__wusb_dev_get_by_usb_dev); | |
1191 | ||
1192 | void wusb_dev_destroy(struct kref *_wusb_dev) | |
1193 | { | |
1194 | struct wusb_dev *wusb_dev | |
1195 | = container_of(_wusb_dev, struct wusb_dev, refcnt); | |
1196 | list_del_init(&wusb_dev->cack_node); | |
1197 | wusb_dev_free(wusb_dev); | |
1198 | d_fnend(1, NULL, "%s (wusb_dev %p) = void\n", __func__, wusb_dev); | |
1199 | } | |
1200 | EXPORT_SYMBOL_GPL(wusb_dev_destroy); | |
1201 | ||
1202 | /* | |
1203 | * Create all the device connect handling infrastructure | |
1204 | * | |
1205 | * This is basically the device info array, Connect Acknowledgement | |
1206 | * (cack) lists, keep-alive timers (and delayed work thread). | |
1207 | */ | |
1208 | int wusbhc_devconnect_create(struct wusbhc *wusbhc) | |
1209 | { | |
1210 | d_fnstart(3, wusbhc->dev, "(wusbhc %p)\n", wusbhc); | |
1211 | ||
1212 | wusbhc->keep_alive_ie.hdr.bIEIdentifier = WUIE_ID_KEEP_ALIVE; | |
1213 | wusbhc->keep_alive_ie.hdr.bLength = sizeof(wusbhc->keep_alive_ie.hdr); | |
1214 | INIT_DELAYED_WORK(&wusbhc->keep_alive_timer, wusbhc_keep_alive_run); | |
1215 | ||
1216 | wusbhc->cack_ie.hdr.bIEIdentifier = WUIE_ID_CONNECTACK; | |
1217 | wusbhc->cack_ie.hdr.bLength = sizeof(wusbhc->cack_ie.hdr); | |
1218 | INIT_LIST_HEAD(&wusbhc->cack_list); | |
1219 | ||
1220 | d_fnend(3, wusbhc->dev, "(wusbhc %p) = void\n", wusbhc); | |
1221 | return 0; | |
1222 | } | |
1223 | ||
1224 | /* | |
1225 | * Release all resources taken by the devconnect stuff | |
1226 | */ | |
1227 | void wusbhc_devconnect_destroy(struct wusbhc *wusbhc) | |
1228 | { | |
1229 | d_fnstart(3, wusbhc->dev, "(wusbhc %p)\n", wusbhc); | |
1230 | d_fnend(3, wusbhc->dev, "(wusbhc %p) = void\n", wusbhc); | |
1231 | } | |
1232 | ||
1233 | /* | |
1234 | * wusbhc_devconnect_start - start accepting device connections | |
1235 | * @wusbhc: the WUSB HC | |
1236 | * | |
1237 | * Sets the Host Info IE to accept all new connections. | |
1238 | * | |
1239 | * FIXME: This also enables the keep alives but this is not necessary | |
1240 | * until there are connected and authenticated devices. | |
1241 | */ | |
1242 | int wusbhc_devconnect_start(struct wusbhc *wusbhc, | |
1243 | const struct wusb_ckhdid *chid) | |
1244 | { | |
1245 | struct device *dev = wusbhc->dev; | |
1246 | struct wuie_host_info *hi; | |
1247 | int result; | |
1248 | ||
1249 | hi = kzalloc(sizeof(*hi), GFP_KERNEL); | |
1250 | if (hi == NULL) | |
1251 | return -ENOMEM; | |
1252 | ||
1253 | hi->hdr.bLength = sizeof(*hi); | |
1254 | hi->hdr.bIEIdentifier = WUIE_ID_HOST_INFO; | |
1255 | hi->attributes = cpu_to_le16((wusbhc->rsv->stream << 3) | WUIE_HI_CAP_ALL); | |
1256 | hi->CHID = *chid; | |
1257 | result = wusbhc_mmcie_set(wusbhc, 0, 0, &hi->hdr); | |
1258 | if (result < 0) { | |
1259 | dev_err(dev, "Cannot add Host Info MMCIE: %d\n", result); | |
1260 | goto error_mmcie_set; | |
1261 | } | |
1262 | wusbhc->wuie_host_info = hi; | |
1263 | ||
1264 | queue_delayed_work(wusbd, &wusbhc->keep_alive_timer, | |
1265 | (wusbhc->trust_timeout*CONFIG_HZ)/1000/2); | |
1266 | ||
1267 | return 0; | |
1268 | ||
1269 | error_mmcie_set: | |
1270 | kfree(hi); | |
1271 | return result; | |
1272 | } | |
1273 | ||
1274 | /* | |
1275 | * wusbhc_devconnect_stop - stop managing connected devices | |
1276 | * @wusbhc: the WUSB HC | |
1277 | * | |
1278 | * Removes the Host Info IE and stops the keep alives. | |
1279 | * | |
1280 | * FIXME: should this disconnect all devices? | |
1281 | */ | |
1282 | void wusbhc_devconnect_stop(struct wusbhc *wusbhc) | |
1283 | { | |
1284 | cancel_delayed_work_sync(&wusbhc->keep_alive_timer); | |
1285 | WARN_ON(!list_empty(&wusbhc->cack_list)); | |
1286 | ||
1287 | wusbhc_mmcie_rm(wusbhc, &wusbhc->wuie_host_info->hdr); | |
1288 | kfree(wusbhc->wuie_host_info); | |
1289 | wusbhc->wuie_host_info = NULL; | |
1290 | } | |
1291 | ||
1292 | /* | |
1293 | * wusb_set_dev_addr - set the WUSB device address used by the host | |
1294 | * @wusbhc: the WUSB HC the device is connect to | |
1295 | * @wusb_dev: the WUSB device | |
1296 | * @addr: new device address | |
1297 | */ | |
1298 | int wusb_set_dev_addr(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev, u8 addr) | |
1299 | { | |
1300 | int result; | |
1301 | ||
1302 | wusb_dev->addr = addr; | |
1303 | result = wusbhc->dev_info_set(wusbhc, wusb_dev); | |
1304 | if (result) | |
1305 | dev_err(wusbhc->dev, "device %d: failed to set device " | |
1306 | "address\n", wusb_dev->port_idx); | |
1307 | else | |
1308 | dev_info(wusbhc->dev, "device %d: %s addr %u\n", | |
1309 | wusb_dev->port_idx, | |
1310 | (addr & WUSB_DEV_ADDR_UNAUTH) ? "unauth" : "auth", | |
1311 | wusb_dev->addr); | |
1312 | ||
1313 | return result; | |
1314 | } |