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df365423 IPG |
1 | /* |
2 | * WUSB Wire Adapter | |
3 | * rpipe management | |
4 | * | |
5 | * Copyright (C) 2005-2006 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 | * | |
25 | * RPIPE | |
26 | * | |
27 | * Targetted at different downstream endpoints | |
28 | * | |
29 | * Descriptor: use to config the remote pipe. | |
30 | * | |
31 | * The number of blocks could be dynamic (wBlocks in descriptor is | |
32 | * 0)--need to schedule them then. | |
33 | * | |
34 | * Each bit in wa->rpipe_bm represents if an rpipe is being used or | |
35 | * not. Rpipes are represented with a 'struct wa_rpipe' that is | |
36 | * attached to the hcpriv member of a 'struct usb_host_endpoint'. | |
37 | * | |
38 | * When you need to xfer data to an endpoint, you get an rpipe for it | |
39 | * with wa_ep_rpipe_get(), which gives you a reference to the rpipe | |
40 | * and keeps a single one (the first one) with the endpoint. When you | |
41 | * are done transferring, you drop that reference. At the end the | |
42 | * rpipe is always allocated and bound to the endpoint. There it might | |
43 | * be recycled when not used. | |
44 | * | |
45 | * Addresses: | |
46 | * | |
47 | * We use a 1:1 mapping mechanism between port address (0 based | |
48 | * index, actually) and the address. The USB stack knows about this. | |
49 | * | |
50 | * USB Stack port number 4 (1 based) | |
51 | * WUSB code port index 3 (0 based) | |
b595076a | 52 | * USB Address 5 (2 based -- 0 is for default, 1 for root hub) |
df365423 IPG |
53 | * |
54 | * Now, because we don't use the concept as default address exactly | |
55 | * like the (wired) USB code does, we need to kind of skip it. So we | |
56 | * never take addresses from the urb->pipe, but from the | |
57 | * urb->dev->devnum, to make sure that we always have the right | |
58 | * destination address. | |
59 | */ | |
60 | #include <linux/init.h> | |
61 | #include <asm/atomic.h> | |
62 | #include <linux/bitmap.h> | |
5a0e3ad6 | 63 | #include <linux/slab.h> |
bce83697 | 64 | |
df365423 IPG |
65 | #include "wusbhc.h" |
66 | #include "wa-hc.h" | |
67 | ||
df365423 IPG |
68 | static int __rpipe_get_descr(struct wahc *wa, |
69 | struct usb_rpipe_descriptor *descr, u16 index) | |
70 | { | |
71 | ssize_t result; | |
72 | struct device *dev = &wa->usb_iface->dev; | |
73 | ||
74 | /* Get the RPIPE descriptor -- we cannot use the usb_get_descriptor() | |
75 | * function because the arguments are different. | |
76 | */ | |
df365423 IPG |
77 | result = usb_control_msg( |
78 | wa->usb_dev, usb_rcvctrlpipe(wa->usb_dev, 0), | |
79 | USB_REQ_GET_DESCRIPTOR, | |
80 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_RPIPE, | |
81 | USB_DT_RPIPE<<8, index, descr, sizeof(*descr), | |
82 | 1000 /* FIXME: arbitrary */); | |
83 | if (result < 0) { | |
84 | dev_err(dev, "rpipe %u: get descriptor failed: %d\n", | |
85 | index, (int)result); | |
86 | goto error; | |
87 | } | |
88 | if (result < sizeof(*descr)) { | |
89 | dev_err(dev, "rpipe %u: got short descriptor " | |
90 | "(%zd vs %zd bytes needed)\n", | |
91 | index, result, sizeof(*descr)); | |
92 | result = -EINVAL; | |
93 | goto error; | |
94 | } | |
95 | result = 0; | |
96 | ||
97 | error: | |
98 | return result; | |
99 | } | |
100 | ||
101 | /* | |
102 | * | |
103 | * The descriptor is assumed to be properly initialized (ie: you got | |
104 | * it through __rpipe_get_descr()). | |
105 | */ | |
106 | static int __rpipe_set_descr(struct wahc *wa, | |
107 | struct usb_rpipe_descriptor *descr, u16 index) | |
108 | { | |
109 | ssize_t result; | |
110 | struct device *dev = &wa->usb_iface->dev; | |
111 | ||
112 | /* we cannot use the usb_get_descriptor() function because the | |
113 | * arguments are different. | |
114 | */ | |
df365423 IPG |
115 | result = usb_control_msg( |
116 | wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0), | |
117 | USB_REQ_SET_DESCRIPTOR, | |
118 | USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_RPIPE, | |
119 | USB_DT_RPIPE<<8, index, descr, sizeof(*descr), | |
120 | HZ / 10); | |
121 | if (result < 0) { | |
122 | dev_err(dev, "rpipe %u: set descriptor failed: %d\n", | |
123 | index, (int)result); | |
124 | goto error; | |
125 | } | |
126 | if (result < sizeof(*descr)) { | |
127 | dev_err(dev, "rpipe %u: sent short descriptor " | |
128 | "(%zd vs %zd bytes required)\n", | |
129 | index, result, sizeof(*descr)); | |
130 | result = -EINVAL; | |
131 | goto error; | |
132 | } | |
133 | result = 0; | |
134 | ||
135 | error: | |
136 | return result; | |
137 | ||
138 | } | |
139 | ||
140 | static void rpipe_init(struct wa_rpipe *rpipe) | |
141 | { | |
142 | kref_init(&rpipe->refcnt); | |
143 | spin_lock_init(&rpipe->seg_lock); | |
144 | INIT_LIST_HEAD(&rpipe->seg_list); | |
145 | } | |
146 | ||
147 | static unsigned rpipe_get_idx(struct wahc *wa, unsigned rpipe_idx) | |
148 | { | |
149 | unsigned long flags; | |
150 | ||
151 | spin_lock_irqsave(&wa->rpipe_bm_lock, flags); | |
152 | rpipe_idx = find_next_zero_bit(wa->rpipe_bm, wa->rpipes, rpipe_idx); | |
153 | if (rpipe_idx < wa->rpipes) | |
154 | set_bit(rpipe_idx, wa->rpipe_bm); | |
155 | spin_unlock_irqrestore(&wa->rpipe_bm_lock, flags); | |
156 | ||
157 | return rpipe_idx; | |
158 | } | |
159 | ||
160 | static void rpipe_put_idx(struct wahc *wa, unsigned rpipe_idx) | |
161 | { | |
162 | unsigned long flags; | |
163 | ||
164 | spin_lock_irqsave(&wa->rpipe_bm_lock, flags); | |
165 | clear_bit(rpipe_idx, wa->rpipe_bm); | |
166 | spin_unlock_irqrestore(&wa->rpipe_bm_lock, flags); | |
167 | } | |
168 | ||
169 | void rpipe_destroy(struct kref *_rpipe) | |
170 | { | |
171 | struct wa_rpipe *rpipe = container_of(_rpipe, struct wa_rpipe, refcnt); | |
172 | u8 index = le16_to_cpu(rpipe->descr.wRPipeIndex); | |
bce83697 | 173 | |
df365423 IPG |
174 | if (rpipe->ep) |
175 | rpipe->ep->hcpriv = NULL; | |
176 | rpipe_put_idx(rpipe->wa, index); | |
177 | wa_put(rpipe->wa); | |
178 | kfree(rpipe); | |
df365423 IPG |
179 | } |
180 | EXPORT_SYMBOL_GPL(rpipe_destroy); | |
181 | ||
182 | /* | |
183 | * Locate an idle rpipe, create an structure for it and return it | |
184 | * | |
185 | * @wa is referenced and unlocked | |
186 | * @crs enum rpipe_attr, required endpoint characteristics | |
187 | * | |
188 | * The rpipe can be used only sequentially (not in parallel). | |
189 | * | |
190 | * The rpipe is moved into the "ready" state. | |
191 | */ | |
192 | static int rpipe_get_idle(struct wa_rpipe **prpipe, struct wahc *wa, u8 crs, | |
193 | gfp_t gfp) | |
194 | { | |
195 | int result; | |
196 | unsigned rpipe_idx; | |
197 | struct wa_rpipe *rpipe; | |
198 | struct device *dev = &wa->usb_iface->dev; | |
199 | ||
df365423 IPG |
200 | rpipe = kzalloc(sizeof(*rpipe), gfp); |
201 | if (rpipe == NULL) | |
202 | return -ENOMEM; | |
203 | rpipe_init(rpipe); | |
204 | ||
205 | /* Look for an idle pipe */ | |
206 | for (rpipe_idx = 0; rpipe_idx < wa->rpipes; rpipe_idx++) { | |
207 | rpipe_idx = rpipe_get_idx(wa, rpipe_idx); | |
208 | if (rpipe_idx >= wa->rpipes) /* no more pipes :( */ | |
209 | break; | |
210 | result = __rpipe_get_descr(wa, &rpipe->descr, rpipe_idx); | |
211 | if (result < 0) | |
212 | dev_err(dev, "Can't get descriptor for rpipe %u: %d\n", | |
213 | rpipe_idx, result); | |
214 | else if ((rpipe->descr.bmCharacteristics & crs) != 0) | |
215 | goto found; | |
216 | rpipe_put_idx(wa, rpipe_idx); | |
217 | } | |
218 | *prpipe = NULL; | |
219 | kfree(rpipe); | |
df365423 IPG |
220 | return -ENXIO; |
221 | ||
222 | found: | |
223 | set_bit(rpipe_idx, wa->rpipe_bm); | |
224 | rpipe->wa = wa_get(wa); | |
225 | *prpipe = rpipe; | |
df365423 IPG |
226 | return 0; |
227 | } | |
228 | ||
229 | static int __rpipe_reset(struct wahc *wa, unsigned index) | |
230 | { | |
231 | int result; | |
232 | struct device *dev = &wa->usb_iface->dev; | |
233 | ||
df365423 IPG |
234 | result = usb_control_msg( |
235 | wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0), | |
236 | USB_REQ_RPIPE_RESET, | |
237 | USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_RPIPE, | |
238 | 0, index, NULL, 0, 1000 /* FIXME: arbitrary */); | |
239 | if (result < 0) | |
240 | dev_err(dev, "rpipe %u: reset failed: %d\n", | |
241 | index, result); | |
242 | return result; | |
243 | } | |
244 | ||
245 | /* | |
246 | * Fake companion descriptor for ep0 | |
247 | * | |
248 | * See WUSB1.0[7.4.4], most of this is zero for bulk/int/ctl | |
249 | */ | |
250 | static struct usb_wireless_ep_comp_descriptor epc0 = { | |
251 | .bLength = sizeof(epc0), | |
252 | .bDescriptorType = USB_DT_WIRELESS_ENDPOINT_COMP, | |
253 | /* .bMaxBurst = 1, */ | |
254 | .bMaxSequence = 31, | |
255 | }; | |
256 | ||
257 | /* | |
258 | * Look for EP companion descriptor | |
259 | * | |
260 | * Get there, look for Inara in the endpoint's extra descriptors | |
261 | */ | |
262 | static struct usb_wireless_ep_comp_descriptor *rpipe_epc_find( | |
263 | struct device *dev, struct usb_host_endpoint *ep) | |
264 | { | |
265 | void *itr; | |
266 | size_t itr_size; | |
267 | struct usb_descriptor_header *hdr; | |
268 | struct usb_wireless_ep_comp_descriptor *epcd; | |
269 | ||
df365423 IPG |
270 | if (ep->desc.bEndpointAddress == 0) { |
271 | epcd = &epc0; | |
272 | goto out; | |
273 | } | |
274 | itr = ep->extra; | |
275 | itr_size = ep->extralen; | |
276 | epcd = NULL; | |
277 | while (itr_size > 0) { | |
278 | if (itr_size < sizeof(*hdr)) { | |
279 | dev_err(dev, "HW Bug? ep 0x%02x: extra descriptors " | |
280 | "at offset %zu: only %zu bytes left\n", | |
281 | ep->desc.bEndpointAddress, | |
282 | itr - (void *) ep->extra, itr_size); | |
283 | break; | |
284 | } | |
285 | hdr = itr; | |
286 | if (hdr->bDescriptorType == USB_DT_WIRELESS_ENDPOINT_COMP) { | |
287 | epcd = itr; | |
288 | break; | |
289 | } | |
290 | if (hdr->bLength > itr_size) { | |
291 | dev_err(dev, "HW Bug? ep 0x%02x: extra descriptor " | |
292 | "at offset %zu (type 0x%02x) " | |
293 | "length %d but only %zu bytes left\n", | |
294 | ep->desc.bEndpointAddress, | |
295 | itr - (void *) ep->extra, hdr->bDescriptorType, | |
296 | hdr->bLength, itr_size); | |
297 | break; | |
298 | } | |
299 | itr += hdr->bLength; | |
300 | itr_size -= hdr->bDescriptorType; | |
301 | } | |
302 | out: | |
df365423 IPG |
303 | return epcd; |
304 | } | |
305 | ||
306 | /* | |
307 | * Aim an rpipe to its device & endpoint destination | |
308 | * | |
309 | * Make sure we change the address to unauthenticathed if the device | |
310 | * is WUSB and it is not authenticated. | |
311 | */ | |
312 | static int rpipe_aim(struct wa_rpipe *rpipe, struct wahc *wa, | |
313 | struct usb_host_endpoint *ep, struct urb *urb, gfp_t gfp) | |
314 | { | |
315 | int result = -ENOMSG; /* better code for lack of companion? */ | |
316 | struct device *dev = &wa->usb_iface->dev; | |
317 | struct usb_device *usb_dev = urb->dev; | |
318 | struct usb_wireless_ep_comp_descriptor *epcd; | |
319 | u8 unauth; | |
320 | ||
df365423 IPG |
321 | epcd = rpipe_epc_find(dev, ep); |
322 | if (epcd == NULL) { | |
323 | dev_err(dev, "ep 0x%02x: can't find companion descriptor\n", | |
324 | ep->desc.bEndpointAddress); | |
325 | goto error; | |
326 | } | |
327 | unauth = usb_dev->wusb && !usb_dev->authenticated ? 0x80 : 0; | |
328 | __rpipe_reset(wa, le16_to_cpu(rpipe->descr.wRPipeIndex)); | |
329 | atomic_set(&rpipe->segs_available, le16_to_cpu(rpipe->descr.wRequests)); | |
330 | /* FIXME: block allocation system; request with queuing and timeout */ | |
331 | /* FIXME: compute so seg_size > ep->maxpktsize */ | |
332 | rpipe->descr.wBlocks = cpu_to_le16(16); /* given */ | |
333 | /* ep0 maxpktsize is 0x200 (WUSB1.0[4.8.1]) */ | |
334 | rpipe->descr.wMaxPacketSize = cpu_to_le16(ep->desc.wMaxPacketSize); | |
335 | rpipe->descr.bHSHubAddress = 0; /* reserved: zero */ | |
336 | rpipe->descr.bHSHubPort = wusb_port_no_to_idx(urb->dev->portnum); | |
337 | /* FIXME: use maximum speed as supported or recommended by device */ | |
338 | rpipe->descr.bSpeed = usb_pipeendpoint(urb->pipe) == 0 ? | |
339 | UWB_PHY_RATE_53 : UWB_PHY_RATE_200; | |
bce83697 DV |
340 | |
341 | dev_dbg(dev, "addr %u (0x%02x) rpipe #%u ep# %u speed %d\n", | |
342 | urb->dev->devnum, urb->dev->devnum | unauth, | |
343 | le16_to_cpu(rpipe->descr.wRPipeIndex), | |
344 | usb_pipeendpoint(urb->pipe), rpipe->descr.bSpeed); | |
345 | ||
df365423 IPG |
346 | /* see security.c:wusb_update_address() */ |
347 | if (unlikely(urb->dev->devnum == 0x80)) | |
348 | rpipe->descr.bDeviceAddress = 0; | |
349 | else | |
350 | rpipe->descr.bDeviceAddress = urb->dev->devnum | unauth; | |
351 | rpipe->descr.bEndpointAddress = ep->desc.bEndpointAddress; | |
352 | /* FIXME: bDataSequence */ | |
353 | rpipe->descr.bDataSequence = 0; | |
354 | /* FIXME: dwCurrentWindow */ | |
355 | rpipe->descr.dwCurrentWindow = cpu_to_le32(1); | |
356 | /* FIXME: bMaxDataSequence */ | |
357 | rpipe->descr.bMaxDataSequence = epcd->bMaxSequence - 1; | |
358 | rpipe->descr.bInterval = ep->desc.bInterval; | |
359 | /* FIXME: bOverTheAirInterval */ | |
360 | rpipe->descr.bOverTheAirInterval = 0; /* 0 if not isoc */ | |
361 | /* FIXME: xmit power & preamble blah blah */ | |
362 | rpipe->descr.bmAttribute = ep->desc.bmAttributes & 0x03; | |
363 | /* rpipe->descr.bmCharacteristics RO */ | |
364 | /* FIXME: bmRetryOptions */ | |
365 | rpipe->descr.bmRetryOptions = 15; | |
366 | /* FIXME: use for assessing link quality? */ | |
367 | rpipe->descr.wNumTransactionErrors = 0; | |
368 | result = __rpipe_set_descr(wa, &rpipe->descr, | |
369 | le16_to_cpu(rpipe->descr.wRPipeIndex)); | |
370 | if (result < 0) { | |
371 | dev_err(dev, "Cannot aim rpipe: %d\n", result); | |
372 | goto error; | |
373 | } | |
374 | result = 0; | |
375 | error: | |
df365423 IPG |
376 | return result; |
377 | } | |
378 | ||
379 | /* | |
380 | * Check an aimed rpipe to make sure it points to where we want | |
381 | * | |
382 | * We use bit 19 of the Linux USB pipe bitmap for unauth vs auth | |
383 | * space; when it is like that, we or 0x80 to make an unauth address. | |
384 | */ | |
385 | static int rpipe_check_aim(const struct wa_rpipe *rpipe, const struct wahc *wa, | |
386 | const struct usb_host_endpoint *ep, | |
387 | const struct urb *urb, gfp_t gfp) | |
388 | { | |
389 | int result = 0; /* better code for lack of companion? */ | |
390 | struct device *dev = &wa->usb_iface->dev; | |
391 | struct usb_device *usb_dev = urb->dev; | |
392 | u8 unauth = (usb_dev->wusb && !usb_dev->authenticated) ? 0x80 : 0; | |
393 | u8 portnum = wusb_port_no_to_idx(urb->dev->portnum); | |
394 | ||
df365423 IPG |
395 | #define AIM_CHECK(rdf, val, text) \ |
396 | do { \ | |
397 | if (rpipe->descr.rdf != (val)) { \ | |
398 | dev_err(dev, \ | |
399 | "rpipe aim discrepancy: " #rdf " " text "\n", \ | |
400 | rpipe->descr.rdf, (val)); \ | |
401 | result = -EINVAL; \ | |
402 | WARN_ON(1); \ | |
403 | } \ | |
404 | } while (0) | |
405 | AIM_CHECK(wMaxPacketSize, cpu_to_le16(ep->desc.wMaxPacketSize), | |
406 | "(%u vs %u)"); | |
407 | AIM_CHECK(bHSHubPort, portnum, "(%u vs %u)"); | |
408 | AIM_CHECK(bSpeed, usb_pipeendpoint(urb->pipe) == 0 ? | |
409 | UWB_PHY_RATE_53 : UWB_PHY_RATE_200, | |
410 | "(%u vs %u)"); | |
411 | AIM_CHECK(bDeviceAddress, urb->dev->devnum | unauth, "(%u vs %u)"); | |
412 | AIM_CHECK(bEndpointAddress, ep->desc.bEndpointAddress, "(%u vs %u)"); | |
413 | AIM_CHECK(bInterval, ep->desc.bInterval, "(%u vs %u)"); | |
414 | AIM_CHECK(bmAttribute, ep->desc.bmAttributes & 0x03, "(%u vs %u)"); | |
415 | #undef AIM_CHECK | |
416 | return result; | |
417 | } | |
418 | ||
419 | #ifndef CONFIG_BUG | |
420 | #define CONFIG_BUG 0 | |
421 | #endif | |
422 | ||
423 | /* | |
424 | * Make sure there is an rpipe allocated for an endpoint | |
425 | * | |
426 | * If already allocated, we just refcount it; if not, we get an | |
427 | * idle one, aim it to the right location and take it. | |
428 | * | |
429 | * Attaches to ep->hcpriv and rpipe->ep to ep. | |
430 | */ | |
431 | int rpipe_get_by_ep(struct wahc *wa, struct usb_host_endpoint *ep, | |
432 | struct urb *urb, gfp_t gfp) | |
433 | { | |
434 | int result = 0; | |
435 | struct device *dev = &wa->usb_iface->dev; | |
436 | struct wa_rpipe *rpipe; | |
437 | u8 eptype; | |
438 | ||
df365423 IPG |
439 | mutex_lock(&wa->rpipe_mutex); |
440 | rpipe = ep->hcpriv; | |
441 | if (rpipe != NULL) { | |
442 | if (CONFIG_BUG == 1) { | |
443 | result = rpipe_check_aim(rpipe, wa, ep, urb, gfp); | |
444 | if (result < 0) | |
445 | goto error; | |
446 | } | |
447 | __rpipe_get(rpipe); | |
bce83697 DV |
448 | dev_dbg(dev, "ep 0x%02x: reusing rpipe %u\n", |
449 | ep->desc.bEndpointAddress, | |
450 | le16_to_cpu(rpipe->descr.wRPipeIndex)); | |
df365423 IPG |
451 | } else { |
452 | /* hmm, assign idle rpipe, aim it */ | |
453 | result = -ENOBUFS; | |
454 | eptype = ep->desc.bmAttributes & 0x03; | |
455 | result = rpipe_get_idle(&rpipe, wa, 1 << eptype, gfp); | |
456 | if (result < 0) | |
457 | goto error; | |
458 | result = rpipe_aim(rpipe, wa, ep, urb, gfp); | |
459 | if (result < 0) { | |
460 | rpipe_put(rpipe); | |
461 | goto error; | |
462 | } | |
463 | ep->hcpriv = rpipe; | |
464 | rpipe->ep = ep; | |
465 | __rpipe_get(rpipe); /* for caching into ep->hcpriv */ | |
bce83697 DV |
466 | dev_dbg(dev, "ep 0x%02x: using rpipe %u\n", |
467 | ep->desc.bEndpointAddress, | |
468 | le16_to_cpu(rpipe->descr.wRPipeIndex)); | |
df365423 | 469 | } |
df365423 IPG |
470 | error: |
471 | mutex_unlock(&wa->rpipe_mutex); | |
df365423 IPG |
472 | return result; |
473 | } | |
474 | ||
475 | /* | |
476 | * Allocate the bitmap for each rpipe. | |
477 | */ | |
478 | int wa_rpipes_create(struct wahc *wa) | |
479 | { | |
480 | wa->rpipes = wa->wa_descr->wNumRPipes; | |
481 | wa->rpipe_bm = kzalloc(BITS_TO_LONGS(wa->rpipes)*sizeof(unsigned long), | |
482 | GFP_KERNEL); | |
483 | if (wa->rpipe_bm == NULL) | |
484 | return -ENOMEM; | |
485 | return 0; | |
486 | } | |
487 | ||
488 | void wa_rpipes_destroy(struct wahc *wa) | |
489 | { | |
490 | struct device *dev = &wa->usb_iface->dev; | |
bce83697 | 491 | |
df365423 IPG |
492 | if (!bitmap_empty(wa->rpipe_bm, wa->rpipes)) { |
493 | char buf[256]; | |
494 | WARN_ON(1); | |
495 | bitmap_scnprintf(buf, sizeof(buf), wa->rpipe_bm, wa->rpipes); | |
496 | dev_err(dev, "BUG: pipes not released on exit: %s\n", buf); | |
497 | } | |
498 | kfree(wa->rpipe_bm); | |
df365423 IPG |
499 | } |
500 | ||
501 | /* | |
502 | * Release resources allocated for an endpoint | |
503 | * | |
504 | * If there is an associated rpipe to this endpoint, Abort any pending | |
505 | * transfers and put it. If the rpipe ends up being destroyed, | |
506 | * __rpipe_destroy() will cleanup ep->hcpriv. | |
507 | * | |
508 | * This is called before calling hcd->stop(), so you don't need to do | |
509 | * anything else in there. | |
510 | */ | |
511 | void rpipe_ep_disable(struct wahc *wa, struct usb_host_endpoint *ep) | |
512 | { | |
df365423 | 513 | struct wa_rpipe *rpipe; |
bce83697 | 514 | |
df365423 IPG |
515 | mutex_lock(&wa->rpipe_mutex); |
516 | rpipe = ep->hcpriv; | |
517 | if (rpipe != NULL) { | |
df365423 IPG |
518 | u16 index = le16_to_cpu(rpipe->descr.wRPipeIndex); |
519 | ||
bce83697 | 520 | usb_control_msg( |
df365423 IPG |
521 | wa->usb_dev, usb_rcvctrlpipe(wa->usb_dev, 0), |
522 | USB_REQ_RPIPE_ABORT, | |
b0a81328 | 523 | USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_RPIPE, |
df365423 | 524 | 0, index, NULL, 0, 1000 /* FIXME: arbitrary */); |
df365423 IPG |
525 | rpipe_put(rpipe); |
526 | } | |
527 | mutex_unlock(&wa->rpipe_mutex); | |
df365423 IPG |
528 | } |
529 | EXPORT_SYMBOL_GPL(rpipe_ep_disable); |