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Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +01001/*
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 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -030027 * Targeted at different downstream endpoints
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +010028 *
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)
Uwe Kleine-Königb5950762010-11-01 15:38:34 -040052 * USB Address 5 (2 based -- 0 is for default, 1 for root hub)
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +010053 *
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 */
Arun Sharma600634972011-07-26 16:09:06 -070060#include <linux/atomic.h>
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +010061#include <linux/bitmap.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090062#include <linux/slab.h>
Paul Gortmakerf940fcd2011-05-27 09:56:31 -040063#include <linux/export.h>
David Vrabelbce83692008-12-22 18:22:50 +000064
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +010065#include "wusbhc.h"
66#include "wa-hc.h"
67
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +010068static 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 */
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +010077 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),
Thomas Pugliese7b3e3742013-12-09 13:19:08 -060082 USB_CTRL_GET_TIMEOUT);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +010083 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
97error:
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 */
106static 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 */
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100115 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),
Thomas Pugliese7b3e3742013-12-09 13:19:08 -0600120 USB_CTRL_SET_TIMEOUT);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100121 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
135error:
136 return result;
137
138}
139
140static 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);
Thomas Pugliese679ee472013-10-07 10:53:57 -0500145 INIT_LIST_HEAD(&rpipe->list_node);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100146}
147
148static unsigned rpipe_get_idx(struct wahc *wa, unsigned rpipe_idx)
149{
150 unsigned long flags;
151
Thomas Pugliese679ee472013-10-07 10:53:57 -0500152 spin_lock_irqsave(&wa->rpipe_lock, flags);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100153 rpipe_idx = find_next_zero_bit(wa->rpipe_bm, wa->rpipes, rpipe_idx);
154 if (rpipe_idx < wa->rpipes)
155 set_bit(rpipe_idx, wa->rpipe_bm);
Thomas Pugliese679ee472013-10-07 10:53:57 -0500156 spin_unlock_irqrestore(&wa->rpipe_lock, flags);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100157
158 return rpipe_idx;
159}
160
161static void rpipe_put_idx(struct wahc *wa, unsigned rpipe_idx)
162{
163 unsigned long flags;
164
Thomas Pugliese679ee472013-10-07 10:53:57 -0500165 spin_lock_irqsave(&wa->rpipe_lock, flags);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100166 clear_bit(rpipe_idx, wa->rpipe_bm);
Thomas Pugliese679ee472013-10-07 10:53:57 -0500167 spin_unlock_irqrestore(&wa->rpipe_lock, flags);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100168}
169
170void rpipe_destroy(struct kref *_rpipe)
171{
172 struct wa_rpipe *rpipe = container_of(_rpipe, struct wa_rpipe, refcnt);
173 u8 index = le16_to_cpu(rpipe->descr.wRPipeIndex);
David Vrabelbce83692008-12-22 18:22:50 +0000174
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100175 if (rpipe->ep)
176 rpipe->ep->hcpriv = NULL;
177 rpipe_put_idx(rpipe->wa, index);
178 wa_put(rpipe->wa);
179 kfree(rpipe);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100180}
181EXPORT_SYMBOL_GPL(rpipe_destroy);
182
183/*
184 * Locate an idle rpipe, create an structure for it and return it
185 *
Rahul Bedarkar0c106d02014-01-04 14:12:24 +0530186 * @wa is referenced and unlocked
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100187 * @crs enum rpipe_attr, required endpoint characteristics
188 *
189 * The rpipe can be used only sequentially (not in parallel).
190 *
191 * The rpipe is moved into the "ready" state.
192 */
193static int rpipe_get_idle(struct wa_rpipe **prpipe, struct wahc *wa, u8 crs,
194 gfp_t gfp)
195{
196 int result;
197 unsigned rpipe_idx;
198 struct wa_rpipe *rpipe;
199 struct device *dev = &wa->usb_iface->dev;
200
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100201 rpipe = kzalloc(sizeof(*rpipe), gfp);
202 if (rpipe == NULL)
203 return -ENOMEM;
204 rpipe_init(rpipe);
205
206 /* Look for an idle pipe */
207 for (rpipe_idx = 0; rpipe_idx < wa->rpipes; rpipe_idx++) {
208 rpipe_idx = rpipe_get_idx(wa, rpipe_idx);
209 if (rpipe_idx >= wa->rpipes) /* no more pipes :( */
210 break;
211 result = __rpipe_get_descr(wa, &rpipe->descr, rpipe_idx);
212 if (result < 0)
213 dev_err(dev, "Can't get descriptor for rpipe %u: %d\n",
214 rpipe_idx, result);
215 else if ((rpipe->descr.bmCharacteristics & crs) != 0)
216 goto found;
217 rpipe_put_idx(wa, rpipe_idx);
218 }
219 *prpipe = NULL;
220 kfree(rpipe);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100221 return -ENXIO;
222
223found:
224 set_bit(rpipe_idx, wa->rpipe_bm);
225 rpipe->wa = wa_get(wa);
226 *prpipe = rpipe;
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100227 return 0;
228}
229
230static int __rpipe_reset(struct wahc *wa, unsigned index)
231{
232 int result;
233 struct device *dev = &wa->usb_iface->dev;
234
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100235 result = usb_control_msg(
236 wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
237 USB_REQ_RPIPE_RESET,
238 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_RPIPE,
Thomas Pugliese7b3e3742013-12-09 13:19:08 -0600239 0, index, NULL, 0, USB_CTRL_SET_TIMEOUT);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100240 if (result < 0)
241 dev_err(dev, "rpipe %u: reset failed: %d\n",
242 index, result);
243 return result;
244}
245
246/*
247 * Fake companion descriptor for ep0
248 *
249 * See WUSB1.0[7.4.4], most of this is zero for bulk/int/ctl
250 */
251static struct usb_wireless_ep_comp_descriptor epc0 = {
252 .bLength = sizeof(epc0),
253 .bDescriptorType = USB_DT_WIRELESS_ENDPOINT_COMP,
Thomas Puglieseee0218f2013-06-06 14:06:01 -0500254 .bMaxBurst = 1,
255 .bMaxSequence = 2,
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100256};
257
258/*
259 * Look for EP companion descriptor
260 *
261 * Get there, look for Inara in the endpoint's extra descriptors
262 */
263static struct usb_wireless_ep_comp_descriptor *rpipe_epc_find(
264 struct device *dev, struct usb_host_endpoint *ep)
265{
266 void *itr;
267 size_t itr_size;
268 struct usb_descriptor_header *hdr;
269 struct usb_wireless_ep_comp_descriptor *epcd;
270
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100271 if (ep->desc.bEndpointAddress == 0) {
272 epcd = &epc0;
273 goto out;
274 }
275 itr = ep->extra;
276 itr_size = ep->extralen;
277 epcd = NULL;
278 while (itr_size > 0) {
279 if (itr_size < sizeof(*hdr)) {
280 dev_err(dev, "HW Bug? ep 0x%02x: extra descriptors "
281 "at offset %zu: only %zu bytes left\n",
282 ep->desc.bEndpointAddress,
283 itr - (void *) ep->extra, itr_size);
284 break;
285 }
286 hdr = itr;
287 if (hdr->bDescriptorType == USB_DT_WIRELESS_ENDPOINT_COMP) {
288 epcd = itr;
289 break;
290 }
291 if (hdr->bLength > itr_size) {
292 dev_err(dev, "HW Bug? ep 0x%02x: extra descriptor "
293 "at offset %zu (type 0x%02x) "
294 "length %d but only %zu bytes left\n",
295 ep->desc.bEndpointAddress,
296 itr - (void *) ep->extra, hdr->bDescriptorType,
297 hdr->bLength, itr_size);
298 break;
299 }
300 itr += hdr->bLength;
Thomas Pugliese4659a242014-02-28 15:15:19 -0600301 itr_size -= hdr->bLength;
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100302 }
303out:
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100304 return epcd;
305}
306
307/*
308 * Aim an rpipe to its device & endpoint destination
309 *
Rahul Bedarkar1076e7a2014-01-04 12:37:52 +0530310 * Make sure we change the address to unauthenticated if the device
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100311 * is WUSB and it is not authenticated.
312 */
313static int rpipe_aim(struct wa_rpipe *rpipe, struct wahc *wa,
314 struct usb_host_endpoint *ep, struct urb *urb, gfp_t gfp)
315{
316 int result = -ENOMSG; /* better code for lack of companion? */
317 struct device *dev = &wa->usb_iface->dev;
318 struct usb_device *usb_dev = urb->dev;
319 struct usb_wireless_ep_comp_descriptor *epcd;
Thomas Puglieseee0218f2013-06-06 14:06:01 -0500320 u32 ack_window, epcd_max_sequence;
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100321 u8 unauth;
322
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100323 epcd = rpipe_epc_find(dev, ep);
324 if (epcd == NULL) {
325 dev_err(dev, "ep 0x%02x: can't find companion descriptor\n",
326 ep->desc.bEndpointAddress);
327 goto error;
328 }
329 unauth = usb_dev->wusb && !usb_dev->authenticated ? 0x80 : 0;
330 __rpipe_reset(wa, le16_to_cpu(rpipe->descr.wRPipeIndex));
Rahul Bedarkar0c106d02014-01-04 14:12:24 +0530331 atomic_set(&rpipe->segs_available,
332 le16_to_cpu(rpipe->descr.wRequests));
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100333 /* FIXME: block allocation system; request with queuing and timeout */
334 /* FIXME: compute so seg_size > ep->maxpktsize */
335 rpipe->descr.wBlocks = cpu_to_le16(16); /* given */
336 /* ep0 maxpktsize is 0x200 (WUSB1.0[4.8.1]) */
Thomas Pugliese7b6bc072013-10-23 14:44:26 -0500337 if (usb_endpoint_xfer_isoc(&ep->desc))
338 rpipe->descr.wMaxPacketSize = epcd->wOverTheAirPacketSize;
339 else
340 rpipe->descr.wMaxPacketSize = ep->desc.wMaxPacketSize;
Thomas Puglieseee0218f2013-06-06 14:06:01 -0500341
342 rpipe->descr.hwa_bMaxBurst = max(min_t(unsigned int,
343 epcd->bMaxBurst, 16U), 1U);
344 rpipe->descr.hwa_bDeviceInfoIndex =
345 wusb_port_no_to_idx(urb->dev->portnum);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100346 /* FIXME: use maximum speed as supported or recommended by device */
347 rpipe->descr.bSpeed = usb_pipeendpoint(urb->pipe) == 0 ?
348 UWB_PHY_RATE_53 : UWB_PHY_RATE_200;
David Vrabelbce83692008-12-22 18:22:50 +0000349
350 dev_dbg(dev, "addr %u (0x%02x) rpipe #%u ep# %u speed %d\n",
351 urb->dev->devnum, urb->dev->devnum | unauth,
352 le16_to_cpu(rpipe->descr.wRPipeIndex),
353 usb_pipeendpoint(urb->pipe), rpipe->descr.bSpeed);
354
Thomas Puglieseee0218f2013-06-06 14:06:01 -0500355 rpipe->descr.hwa_reserved = 0;
356
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100357 rpipe->descr.bEndpointAddress = ep->desc.bEndpointAddress;
358 /* FIXME: bDataSequence */
359 rpipe->descr.bDataSequence = 0;
Thomas Puglieseee0218f2013-06-06 14:06:01 -0500360
361 /* start with base window of hwa_bMaxBurst bits starting at 0. */
362 ack_window = 0xFFFFFFFF >> (32 - rpipe->descr.hwa_bMaxBurst);
363 rpipe->descr.dwCurrentWindow = cpu_to_le32(ack_window);
364 epcd_max_sequence = max(min_t(unsigned int,
365 epcd->bMaxSequence, 32U), 2U);
366 rpipe->descr.bMaxDataSequence = epcd_max_sequence - 1;
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100367 rpipe->descr.bInterval = ep->desc.bInterval;
Thomas Pugliese1a7ff0e2013-10-01 14:04:34 -0500368 if (usb_endpoint_xfer_isoc(&ep->desc))
369 rpipe->descr.bOverTheAirInterval = epcd->bOverTheAirInterval;
370 else
371 rpipe->descr.bOverTheAirInterval = 0; /* 0 if not isoc */
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100372 /* FIXME: xmit power & preamble blah blah */
Thomas Puglieseee0218f2013-06-06 14:06:01 -0500373 rpipe->descr.bmAttribute = (ep->desc.bmAttributes &
374 USB_ENDPOINT_XFERTYPE_MASK);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100375 /* rpipe->descr.bmCharacteristics RO */
Thomas Pugliesef265d4d2013-06-18 13:31:26 -0500376 rpipe->descr.bmRetryOptions = (wa->wusb->retry_count & 0xF);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100377 /* FIXME: use for assessing link quality? */
378 rpipe->descr.wNumTransactionErrors = 0;
379 result = __rpipe_set_descr(wa, &rpipe->descr,
380 le16_to_cpu(rpipe->descr.wRPipeIndex));
381 if (result < 0) {
382 dev_err(dev, "Cannot aim rpipe: %d\n", result);
383 goto error;
384 }
385 result = 0;
386error:
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100387 return result;
388}
389
390/*
391 * Check an aimed rpipe to make sure it points to where we want
392 *
393 * We use bit 19 of the Linux USB pipe bitmap for unauth vs auth
394 * space; when it is like that, we or 0x80 to make an unauth address.
395 */
396static int rpipe_check_aim(const struct wa_rpipe *rpipe, const struct wahc *wa,
397 const struct usb_host_endpoint *ep,
398 const struct urb *urb, gfp_t gfp)
399{
Thomas Puglieseee0218f2013-06-06 14:06:01 -0500400 int result = 0;
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100401 struct device *dev = &wa->usb_iface->dev;
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100402 u8 portnum = wusb_port_no_to_idx(urb->dev->portnum);
403
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100404#define AIM_CHECK(rdf, val, text) \
405 do { \
406 if (rpipe->descr.rdf != (val)) { \
407 dev_err(dev, \
408 "rpipe aim discrepancy: " #rdf " " text "\n", \
409 rpipe->descr.rdf, (val)); \
410 result = -EINVAL; \
411 WARN_ON(1); \
412 } \
413 } while (0)
Thomas Puglieseee0218f2013-06-06 14:06:01 -0500414 AIM_CHECK(hwa_bDeviceInfoIndex, portnum, "(%u vs %u)");
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100415 AIM_CHECK(bSpeed, usb_pipeendpoint(urb->pipe) == 0 ?
416 UWB_PHY_RATE_53 : UWB_PHY_RATE_200,
417 "(%u vs %u)");
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100418 AIM_CHECK(bEndpointAddress, ep->desc.bEndpointAddress, "(%u vs %u)");
419 AIM_CHECK(bInterval, ep->desc.bInterval, "(%u vs %u)");
420 AIM_CHECK(bmAttribute, ep->desc.bmAttributes & 0x03, "(%u vs %u)");
421#undef AIM_CHECK
422 return result;
423}
424
425#ifndef CONFIG_BUG
426#define CONFIG_BUG 0
427#endif
428
429/*
430 * Make sure there is an rpipe allocated for an endpoint
431 *
432 * If already allocated, we just refcount it; if not, we get an
433 * idle one, aim it to the right location and take it.
434 *
435 * Attaches to ep->hcpriv and rpipe->ep to ep.
436 */
437int rpipe_get_by_ep(struct wahc *wa, struct usb_host_endpoint *ep,
438 struct urb *urb, gfp_t gfp)
439{
440 int result = 0;
441 struct device *dev = &wa->usb_iface->dev;
442 struct wa_rpipe *rpipe;
443 u8 eptype;
444
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100445 mutex_lock(&wa->rpipe_mutex);
446 rpipe = ep->hcpriv;
447 if (rpipe != NULL) {
448 if (CONFIG_BUG == 1) {
449 result = rpipe_check_aim(rpipe, wa, ep, urb, gfp);
450 if (result < 0)
451 goto error;
452 }
453 __rpipe_get(rpipe);
David Vrabelbce83692008-12-22 18:22:50 +0000454 dev_dbg(dev, "ep 0x%02x: reusing rpipe %u\n",
455 ep->desc.bEndpointAddress,
456 le16_to_cpu(rpipe->descr.wRPipeIndex));
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100457 } else {
458 /* hmm, assign idle rpipe, aim it */
459 result = -ENOBUFS;
460 eptype = ep->desc.bmAttributes & 0x03;
461 result = rpipe_get_idle(&rpipe, wa, 1 << eptype, gfp);
462 if (result < 0)
463 goto error;
464 result = rpipe_aim(rpipe, wa, ep, urb, gfp);
465 if (result < 0) {
466 rpipe_put(rpipe);
467 goto error;
468 }
469 ep->hcpriv = rpipe;
470 rpipe->ep = ep;
471 __rpipe_get(rpipe); /* for caching into ep->hcpriv */
David Vrabelbce83692008-12-22 18:22:50 +0000472 dev_dbg(dev, "ep 0x%02x: using rpipe %u\n",
473 ep->desc.bEndpointAddress,
474 le16_to_cpu(rpipe->descr.wRPipeIndex));
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100475 }
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100476error:
477 mutex_unlock(&wa->rpipe_mutex);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100478 return result;
479}
480
481/*
482 * Allocate the bitmap for each rpipe.
483 */
484int wa_rpipes_create(struct wahc *wa)
485{
Thomas Pugliese1653d2f2013-10-07 10:07:51 -0500486 wa->rpipes = le16_to_cpu(wa->wa_descr->wNumRPipes);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100487 wa->rpipe_bm = kzalloc(BITS_TO_LONGS(wa->rpipes)*sizeof(unsigned long),
488 GFP_KERNEL);
489 if (wa->rpipe_bm == NULL)
490 return -ENOMEM;
491 return 0;
492}
493
494void wa_rpipes_destroy(struct wahc *wa)
495{
496 struct device *dev = &wa->usb_iface->dev;
David Vrabelbce83692008-12-22 18:22:50 +0000497
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100498 if (!bitmap_empty(wa->rpipe_bm, wa->rpipes)) {
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100499 WARN_ON(1);
Tejun Heo125918d2015-02-13 14:37:53 -0800500 dev_err(dev, "BUG: pipes not released on exit: %*pb\n",
501 wa->rpipes, wa->rpipe_bm);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100502 }
503 kfree(wa->rpipe_bm);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100504}
505
506/*
507 * Release resources allocated for an endpoint
508 *
509 * If there is an associated rpipe to this endpoint, Abort any pending
510 * transfers and put it. If the rpipe ends up being destroyed,
511 * __rpipe_destroy() will cleanup ep->hcpriv.
512 *
513 * This is called before calling hcd->stop(), so you don't need to do
514 * anything else in there.
515 */
516void rpipe_ep_disable(struct wahc *wa, struct usb_host_endpoint *ep)
517{
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100518 struct wa_rpipe *rpipe;
David Vrabelbce83692008-12-22 18:22:50 +0000519
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100520 mutex_lock(&wa->rpipe_mutex);
521 rpipe = ep->hcpriv;
522 if (rpipe != NULL) {
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100523 u16 index = le16_to_cpu(rpipe->descr.wRPipeIndex);
524
David Vrabelbce83692008-12-22 18:22:50 +0000525 usb_control_msg(
Johan Hovolddf3ce232014-05-26 19:23:52 +0200526 wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100527 USB_REQ_RPIPE_ABORT,
Anderson Lizardob0a81322008-09-17 16:34:32 +0100528 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_RPIPE,
Thomas Pugliese7b3e3742013-12-09 13:19:08 -0600529 0, index, NULL, 0, USB_CTRL_SET_TIMEOUT);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100530 rpipe_put(rpipe);
531 }
532 mutex_unlock(&wa->rpipe_mutex);
Inaky Perez-Gonzalezdf365422008-09-17 16:34:29 +0100533}
534EXPORT_SYMBOL_GPL(rpipe_ep_disable);
Thomas Pugliese6d33f7b2013-08-15 12:21:30 -0500535
536/* Clear the stalled status of an RPIPE. */
537void rpipe_clear_feature_stalled(struct wahc *wa, struct usb_host_endpoint *ep)
538{
539 struct wa_rpipe *rpipe;
540
541 mutex_lock(&wa->rpipe_mutex);
542 rpipe = ep->hcpriv;
543 if (rpipe != NULL) {
544 u16 index = le16_to_cpu(rpipe->descr.wRPipeIndex);
545
546 usb_control_msg(
Johan Hovolddf3ce232014-05-26 19:23:52 +0200547 wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
Thomas Pugliese6d33f7b2013-08-15 12:21:30 -0500548 USB_REQ_CLEAR_FEATURE,
549 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_RPIPE,
Thomas Pugliese7b3e3742013-12-09 13:19:08 -0600550 RPIPE_STALL, index, NULL, 0, USB_CTRL_SET_TIMEOUT);
Thomas Pugliese6d33f7b2013-08-15 12:21:30 -0500551 }
552 mutex_unlock(&wa->rpipe_mutex);
553}
554EXPORT_SYMBOL_GPL(rpipe_clear_feature_stalled);