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x86/topology: Fix function name in documentation
[cris-mirror.git] / drivers / usb / usbip / vhci_hcd.c
blobc3e1008aa491ee45071adab6215f7440aa6dfa13
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2003-2008 Takahiro Hirofuchi
4 * Copyright (C) 2015-2016 Nobuo Iwata
5 */
6
7 #include <linux/init.h>
8 #include <linux/file.h>
9 #include <linux/kernel.h>
10 #include <linux/kthread.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/slab.h>
14
15 #include "usbip_common.h"
16 #include "vhci.h"
17
18 #define DRIVER_AUTHOR "Takahiro Hirofuchi"
19 #define DRIVER_DESC "USB/IP 'Virtual' Host Controller (VHCI) Driver"
20
21 /*
22 * TODO
23 * - update root hub emulation
24 * - move the emulation code to userland ?
25 * porting to other operating systems
26 * minimize kernel code
27 * - add suspend/resume code
28 * - clean up everything
29 */
30
31 /* See usb gadget dummy hcd */
32
33 static int vhci_hub_status(struct usb_hcd *hcd, char *buff);
34 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
35 u16 wIndex, char *buff, u16 wLength);
36 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
37 gfp_t mem_flags);
38 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
39 static int vhci_start(struct usb_hcd *vhci_hcd);
40 static void vhci_stop(struct usb_hcd *hcd);
41 static int vhci_get_frame_number(struct usb_hcd *hcd);
42
43 static const char driver_name[] = "vhci_hcd";
44 static const char driver_desc[] = "USB/IP Virtual Host Controller";
45
46 int vhci_num_controllers = VHCI_NR_HCS;
47 struct vhci *vhcis;
48
49 static const char * const bit_desc[] = {
50 "CONNECTION", /*0*/
51 "ENABLE", /*1*/
52 "SUSPEND", /*2*/
53 "OVER_CURRENT", /*3*/
54 "RESET", /*4*/
55 "L1", /*5*/
56 "R6", /*6*/
57 "R7", /*7*/
58 "POWER", /*8*/
59 "LOWSPEED", /*9*/
60 "HIGHSPEED", /*10*/
61 "PORT_TEST", /*11*/
62 "INDICATOR", /*12*/
63 "R13", /*13*/
64 "R14", /*14*/
65 "R15", /*15*/
66 "C_CONNECTION", /*16*/
67 "C_ENABLE", /*17*/
68 "C_SUSPEND", /*18*/
69 "C_OVER_CURRENT", /*19*/
70 "C_RESET", /*20*/
71 "C_L1", /*21*/
72 "R22", /*22*/
73 "R23", /*23*/
74 "R24", /*24*/
75 "R25", /*25*/
76 "R26", /*26*/
77 "R27", /*27*/
78 "R28", /*28*/
79 "R29", /*29*/
80 "R30", /*30*/
81 "R31", /*31*/
82 };
83
84 static const char * const bit_desc_ss[] = {
85 "CONNECTION", /*0*/
86 "ENABLE", /*1*/
87 "SUSPEND", /*2*/
88 "OVER_CURRENT", /*3*/
89 "RESET", /*4*/
90 "L1", /*5*/
91 "R6", /*6*/
92 "R7", /*7*/
93 "R8", /*8*/
94 "POWER", /*9*/
95 "HIGHSPEED", /*10*/
96 "PORT_TEST", /*11*/
97 "INDICATOR", /*12*/
98 "R13", /*13*/
99 "R14", /*14*/
100 "R15", /*15*/
101 "C_CONNECTION", /*16*/
102 "C_ENABLE", /*17*/
103 "C_SUSPEND", /*18*/
104 "C_OVER_CURRENT", /*19*/
105 "C_RESET", /*20*/
106 "C_BH_RESET", /*21*/
107 "C_LINK_STATE", /*22*/
108 "C_CONFIG_ERROR", /*23*/
109 "R24", /*24*/
110 "R25", /*25*/
111 "R26", /*26*/
112 "R27", /*27*/
113 "R28", /*28*/
114 "R29", /*29*/
115 "R30", /*30*/
116 "R31", /*31*/
117 };
118
119 static void dump_port_status_diff(u32 prev_status, u32 new_status, bool usb3)
120 {
121 int i = 0;
122 u32 bit = 1;
123 const char * const *desc = bit_desc;
124
125 if (usb3)
126 desc = bit_desc_ss;
127
128 pr_debug("status prev -> new: %08x -> %08x\n", prev_status, new_status);
129 while (bit) {
130 u32 prev = prev_status & bit;
131 u32 new = new_status & bit;
132 char change;
133
134 if (!prev && new)
135 change = '+';
136 else if (prev && !new)
137 change = '-';
138 else
139 change = ' ';
140
141 if (prev || new) {
142 pr_debug(" %c%s\n", change, desc[i]);
143
144 if (bit == 1) /* USB_PORT_STAT_CONNECTION */
145 pr_debug(" %c%s\n", change, "USB_PORT_STAT_SPEED_5GBPS");
146 }
147 bit <<= 1;
148 i++;
149 }
150 pr_debug("\n");
151 }
152
153 void rh_port_connect(struct vhci_device *vdev, enum usb_device_speed speed)
154 {
155 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
156 struct vhci *vhci = vhci_hcd->vhci;
157 int rhport = vdev->rhport;
158 u32 status;
159 unsigned long flags;
160
161 usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport);
162
163 spin_lock_irqsave(&vhci->lock, flags);
164
165 status = vhci_hcd->port_status[rhport];
166
167 status |= USB_PORT_STAT_CONNECTION | (1 << USB_PORT_FEAT_C_CONNECTION);
168
169 switch (speed) {
170 case USB_SPEED_HIGH:
171 status |= USB_PORT_STAT_HIGH_SPEED;
172 break;
173 case USB_SPEED_LOW:
174 status |= USB_PORT_STAT_LOW_SPEED;
175 break;
176 default:
177 break;
178 }
179
180 vhci_hcd->port_status[rhport] = status;
181
182 spin_unlock_irqrestore(&vhci->lock, flags);
183
184 usb_hcd_poll_rh_status(vhci_hcd_to_hcd(vhci_hcd));
185 }
186
187 static void rh_port_disconnect(struct vhci_device *vdev)
188 {
189 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
190 struct vhci *vhci = vhci_hcd->vhci;
191 int rhport = vdev->rhport;
192 u32 status;
193 unsigned long flags;
194
195 usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport);
196
197 spin_lock_irqsave(&vhci->lock, flags);
198
199 status = vhci_hcd->port_status[rhport];
200
201 status &= ~USB_PORT_STAT_CONNECTION;
202 status |= (1 << USB_PORT_FEAT_C_CONNECTION);
203
204 vhci_hcd->port_status[rhport] = status;
205
206 spin_unlock_irqrestore(&vhci->lock, flags);
207 usb_hcd_poll_rh_status(vhci_hcd_to_hcd(vhci_hcd));
208 }
209
210 #define PORT_C_MASK \
211 ((USB_PORT_STAT_C_CONNECTION \
212 | USB_PORT_STAT_C_ENABLE \
213 | USB_PORT_STAT_C_SUSPEND \
214 | USB_PORT_STAT_C_OVERCURRENT \
215 | USB_PORT_STAT_C_RESET) << 16)
216
217 /*
218 * Returns 0 if the status hasn't changed, or the number of bytes in buf.
219 * Ports are 0-indexed from the HCD point of view,
220 * and 1-indexed from the USB core pointer of view.
221 *
222 * @buf: a bitmap to show which port status has been changed.
223 * bit 0: reserved
224 * bit 1: the status of port 0 has been changed.
225 * bit 2: the status of port 1 has been changed.
226 * ...
227 */
228 static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
229 {
230 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
231 struct vhci *vhci = vhci_hcd->vhci;
232 int retval = DIV_ROUND_UP(VHCI_HC_PORTS + 1, 8);
233 int rhport;
234 int changed = 0;
235 unsigned long flags;
236
237 memset(buf, 0, retval);
238
239 spin_lock_irqsave(&vhci->lock, flags);
240 if (!HCD_HW_ACCESSIBLE(hcd)) {
241 usbip_dbg_vhci_rh("hw accessible flag not on?\n");
242 goto done;
243 }
244
245 /* check pseudo status register for each port */
246 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
247 if ((vhci_hcd->port_status[rhport] & PORT_C_MASK)) {
248 /* The status of a port has been changed, */
249 usbip_dbg_vhci_rh("port %d status changed\n", rhport);
250
251 buf[(rhport + 1) / 8] |= 1 << (rhport + 1) % 8;
252 changed = 1;
253 }
254 }
255
256 if ((hcd->state == HC_STATE_SUSPENDED) && (changed == 1))
257 usb_hcd_resume_root_hub(hcd);
258
259 done:
260 spin_unlock_irqrestore(&vhci->lock, flags);
261 return changed ? retval : 0;
262 }
263
264 /* usb 3.0 root hub device descriptor */
265 static struct {
266 struct usb_bos_descriptor bos;
267 struct usb_ss_cap_descriptor ss_cap;
268 } __packed usb3_bos_desc = {
269
270 .bos = {
271 .bLength = USB_DT_BOS_SIZE,
272 .bDescriptorType = USB_DT_BOS,
273 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)),
274 .bNumDeviceCaps = 1,
275 },
276 .ss_cap = {
277 .bLength = USB_DT_USB_SS_CAP_SIZE,
278 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
279 .bDevCapabilityType = USB_SS_CAP_TYPE,
280 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION),
281 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION),
282 },
283 };
284
285 static inline void
286 ss_hub_descriptor(struct usb_hub_descriptor *desc)
287 {
288 memset(desc, 0, sizeof *desc);
289 desc->bDescriptorType = USB_DT_SS_HUB;
290 desc->bDescLength = 12;
291 desc->wHubCharacteristics = cpu_to_le16(
292 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM);
293 desc->bNbrPorts = VHCI_HC_PORTS;
294 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
295 desc->u.ss.DeviceRemovable = 0xffff;
296 }
297
298 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
299 {
300 int width;
301
302 memset(desc, 0, sizeof(*desc));
303 desc->bDescriptorType = USB_DT_HUB;
304 desc->wHubCharacteristics = cpu_to_le16(
305 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM);
306
307 desc->bNbrPorts = VHCI_HC_PORTS;
308 BUILD_BUG_ON(VHCI_HC_PORTS > USB_MAXCHILDREN);
309 width = desc->bNbrPorts / 8 + 1;
310 desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * width;
311 memset(&desc->u.hs.DeviceRemovable[0], 0, width);
312 memset(&desc->u.hs.DeviceRemovable[width], 0xff, width);
313 }
314
315 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
316 u16 wIndex, char *buf, u16 wLength)
317 {
318 struct vhci_hcd *vhci_hcd;
319 struct vhci *vhci;
320 int retval = 0;
321 int rhport;
322 unsigned long flags;
323
324 u32 prev_port_status[VHCI_HC_PORTS];
325
326 if (!HCD_HW_ACCESSIBLE(hcd))
327 return -ETIMEDOUT;
328
329 /*
330 * NOTE:
331 * wIndex (bits 0-7) shows the port number and begins from 1?
332 */
333 wIndex = ((__u8)(wIndex & 0x00ff));
334 usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue,
335 wIndex);
336
337 if (wIndex > VHCI_HC_PORTS)
338 pr_err("invalid port number %d\n", wIndex);
339 rhport = wIndex - 1;
340
341 vhci_hcd = hcd_to_vhci_hcd(hcd);
342 vhci = vhci_hcd->vhci;
343
344 spin_lock_irqsave(&vhci->lock, flags);
345
346 /* store old status and compare now and old later */
347 if (usbip_dbg_flag_vhci_rh) {
348 memcpy(prev_port_status, vhci_hcd->port_status,
349 sizeof(prev_port_status));
350 }
351
352 switch (typeReq) {
353 case ClearHubFeature:
354 usbip_dbg_vhci_rh(" ClearHubFeature\n");
355 break;
356 case ClearPortFeature:
357 switch (wValue) {
358 case USB_PORT_FEAT_SUSPEND:
359 if (hcd->speed == HCD_USB3) {
360 pr_err(" ClearPortFeature: USB_PORT_FEAT_SUSPEND req not "
361 "supported for USB 3.0 roothub\n");
362 goto error;
363 }
364 usbip_dbg_vhci_rh(
365 " ClearPortFeature: USB_PORT_FEAT_SUSPEND\n");
366 if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_SUSPEND) {
367 /* 20msec signaling */
368 vhci_hcd->resuming = 1;
369 vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
370 }
371 break;
372 case USB_PORT_FEAT_POWER:
373 usbip_dbg_vhci_rh(
374 " ClearPortFeature: USB_PORT_FEAT_POWER\n");
375 if (hcd->speed == HCD_USB3)
376 vhci_hcd->port_status[rhport] &= ~USB_SS_PORT_STAT_POWER;
377 else
378 vhci_hcd->port_status[rhport] &= ~USB_PORT_STAT_POWER;
379 break;
380 default:
381 usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n",
382 wValue);
383 vhci_hcd->port_status[rhport] &= ~(1 << wValue);
384 break;
385 }
386 break;
387 case GetHubDescriptor:
388 usbip_dbg_vhci_rh(" GetHubDescriptor\n");
389 if (hcd->speed == HCD_USB3 &&
390 (wLength < USB_DT_SS_HUB_SIZE ||
391 wValue != (USB_DT_SS_HUB << 8))) {
392 pr_err("Wrong hub descriptor type for USB 3.0 roothub.\n");
393 goto error;
394 }
395 if (hcd->speed == HCD_USB3)
396 ss_hub_descriptor((struct usb_hub_descriptor *) buf);
397 else
398 hub_descriptor((struct usb_hub_descriptor *) buf);
399 break;
400 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
401 if (hcd->speed != HCD_USB3)
402 goto error;
403
404 if ((wValue >> 8) != USB_DT_BOS)
405 goto error;
406
407 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
408 retval = sizeof(usb3_bos_desc);
409 break;
410 case GetHubStatus:
411 usbip_dbg_vhci_rh(" GetHubStatus\n");
412 *(__le32 *) buf = cpu_to_le32(0);
413 break;
414 case GetPortStatus:
415 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex);
416 if (wIndex < 1) {
417 pr_err("invalid port number %d\n", wIndex);
418 retval = -EPIPE;
419 }
420
421 /* we do not care about resume. */
422
423 /* whoever resets or resumes must GetPortStatus to
424 * complete it!!
425 */
426 if (vhci_hcd->resuming && time_after(jiffies, vhci_hcd->re_timeout)) {
427 vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_SUSPEND);
428 vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_SUSPEND);
429 vhci_hcd->resuming = 0;
430 vhci_hcd->re_timeout = 0;
431 }
432
433 if ((vhci_hcd->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) !=
434 0 && time_after(jiffies, vhci_hcd->re_timeout)) {
435 vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_RESET);
436 vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_RESET);
437 vhci_hcd->re_timeout = 0;
438
439 if (vhci_hcd->vdev[rhport].ud.status ==
440 VDEV_ST_NOTASSIGNED) {
441 usbip_dbg_vhci_rh(
442 " enable rhport %d (status %u)\n",
443 rhport,
444 vhci_hcd->vdev[rhport].ud.status);
445 vhci_hcd->port_status[rhport] |=
446 USB_PORT_STAT_ENABLE;
447 }
448
449 if (hcd->speed < HCD_USB3) {
450 switch (vhci_hcd->vdev[rhport].speed) {
451 case USB_SPEED_HIGH:
452 vhci_hcd->port_status[rhport] |=
453 USB_PORT_STAT_HIGH_SPEED;
454 break;
455 case USB_SPEED_LOW:
456 vhci_hcd->port_status[rhport] |=
457 USB_PORT_STAT_LOW_SPEED;
458 break;
459 default:
460 pr_err("vhci_device speed not set\n");
461 break;
462 }
463 }
464 }
465 ((__le16 *) buf)[0] = cpu_to_le16(vhci_hcd->port_status[rhport]);
466 ((__le16 *) buf)[1] =
467 cpu_to_le16(vhci_hcd->port_status[rhport] >> 16);
468
469 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0],
470 ((u16 *)buf)[1]);
471 break;
472 case SetHubFeature:
473 usbip_dbg_vhci_rh(" SetHubFeature\n");
474 retval = -EPIPE;
475 break;
476 case SetPortFeature:
477 switch (wValue) {
478 case USB_PORT_FEAT_LINK_STATE:
479 usbip_dbg_vhci_rh(
480 " SetPortFeature: USB_PORT_FEAT_LINK_STATE\n");
481 if (hcd->speed != HCD_USB3) {
482 pr_err("USB_PORT_FEAT_LINK_STATE req not "
483 "supported for USB 2.0 roothub\n");
484 goto error;
485 }
486 /*
487 * Since this is dummy we don't have an actual link so
488 * there is nothing to do for the SET_LINK_STATE cmd
489 */
490 break;
491 case USB_PORT_FEAT_U1_TIMEOUT:
492 usbip_dbg_vhci_rh(
493 " SetPortFeature: USB_PORT_FEAT_U1_TIMEOUT\n");
494 case USB_PORT_FEAT_U2_TIMEOUT:
495 usbip_dbg_vhci_rh(
496 " SetPortFeature: USB_PORT_FEAT_U2_TIMEOUT\n");
497 /* TODO: add suspend/resume support! */
498 if (hcd->speed != HCD_USB3) {
499 pr_err("USB_PORT_FEAT_U1/2_TIMEOUT req not "
500 "supported for USB 2.0 roothub\n");
501 goto error;
502 }
503 break;
504 case USB_PORT_FEAT_SUSPEND:
505 usbip_dbg_vhci_rh(
506 " SetPortFeature: USB_PORT_FEAT_SUSPEND\n");
507 /* Applicable only for USB2.0 hub */
508 if (hcd->speed == HCD_USB3) {
509 pr_err("USB_PORT_FEAT_SUSPEND req not "
510 "supported for USB 3.0 roothub\n");
511 goto error;
512 }
513
514 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_SUSPEND;
515 break;
516 case USB_PORT_FEAT_POWER:
517 usbip_dbg_vhci_rh(
518 " SetPortFeature: USB_PORT_FEAT_POWER\n");
519 if (hcd->speed == HCD_USB3)
520 vhci_hcd->port_status[rhport] |= USB_SS_PORT_STAT_POWER;
521 else
522 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_POWER;
523 break;
524 case USB_PORT_FEAT_BH_PORT_RESET:
525 usbip_dbg_vhci_rh(
526 " SetPortFeature: USB_PORT_FEAT_BH_PORT_RESET\n");
527 /* Applicable only for USB3.0 hub */
528 if (hcd->speed != HCD_USB3) {
529 pr_err("USB_PORT_FEAT_BH_PORT_RESET req not "
530 "supported for USB 2.0 roothub\n");
531 goto error;
532 }
533 /* FALLS THROUGH */
534 case USB_PORT_FEAT_RESET:
535 usbip_dbg_vhci_rh(
536 " SetPortFeature: USB_PORT_FEAT_RESET\n");
537 /* if it's already enabled, disable */
538 if (hcd->speed == HCD_USB3) {
539 vhci_hcd->port_status[rhport] = 0;
540 vhci_hcd->port_status[rhport] =
541 (USB_SS_PORT_STAT_POWER |
542 USB_PORT_STAT_CONNECTION |
543 USB_PORT_STAT_RESET);
544 } else if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_ENABLE) {
545 vhci_hcd->port_status[rhport] &= ~(USB_PORT_STAT_ENABLE
546 | USB_PORT_STAT_LOW_SPEED
547 | USB_PORT_STAT_HIGH_SPEED);
548 }
549
550 /* 50msec reset signaling */
551 vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
552
553 /* FALLS THROUGH */
554 default:
555 usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
556 wValue);
557 if (hcd->speed == HCD_USB3) {
558 if ((vhci_hcd->port_status[rhport] &
559 USB_SS_PORT_STAT_POWER) != 0) {
560 vhci_hcd->port_status[rhport] |= (1 << wValue);
561 }
562 } else
563 if ((vhci_hcd->port_status[rhport] &
564 USB_PORT_STAT_POWER) != 0) {
565 vhci_hcd->port_status[rhport] |= (1 << wValue);
566 }
567 }
568 break;
569 case GetPortErrorCount:
570 usbip_dbg_vhci_rh(" GetPortErrorCount\n");
571 if (hcd->speed != HCD_USB3) {
572 pr_err("GetPortErrorCount req not "
573 "supported for USB 2.0 roothub\n");
574 goto error;
575 }
576 /* We'll always return 0 since this is a dummy hub */
577 *(__le32 *) buf = cpu_to_le32(0);
578 break;
579 case SetHubDepth:
580 usbip_dbg_vhci_rh(" SetHubDepth\n");
581 if (hcd->speed != HCD_USB3) {
582 pr_err("SetHubDepth req not supported for "
583 "USB 2.0 roothub\n");
584 goto error;
585 }
586 break;
587 default:
588 pr_err("default hub control req: %04x v%04x i%04x l%d\n",
589 typeReq, wValue, wIndex, wLength);
590 error:
591 /* "protocol stall" on error */
592 retval = -EPIPE;
593 }
594
595 if (usbip_dbg_flag_vhci_rh) {
596 pr_debug("port %d\n", rhport);
597 /* Only dump valid port status */
598 if (rhport >= 0) {
599 dump_port_status_diff(prev_port_status[rhport],
600 vhci_hcd->port_status[rhport],
601 hcd->speed == HCD_USB3);
602 }
603 }
604 usbip_dbg_vhci_rh(" bye\n");
605
606 spin_unlock_irqrestore(&vhci->lock, flags);
607
608 if ((vhci_hcd->port_status[rhport] & PORT_C_MASK) != 0)
609 usb_hcd_poll_rh_status(hcd);
610
611 return retval;
612 }
613
614 static void vhci_tx_urb(struct urb *urb, struct vhci_device *vdev)
615 {
616 struct vhci_priv *priv;
617 struct vhci_hcd *vhci_hcd;
618 unsigned long flags;
619
620 if (!vdev) {
621 pr_err("could not get virtual device");
622 return;
623 }
624 vhci_hcd = vdev_to_vhci_hcd(vdev);
625
626 priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
627 if (!priv) {
628 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
629 return;
630 }
631
632 spin_lock_irqsave(&vdev->priv_lock, flags);
633
634 priv->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
635 if (priv->seqnum == 0xffff)
636 dev_info(&urb->dev->dev, "seqnum max\n");
637
638 priv->vdev = vdev;
639 priv->urb = urb;
640
641 urb->hcpriv = (void *) priv;
642
643 list_add_tail(&priv->list, &vdev->priv_tx);
644
645 wake_up(&vdev->waitq_tx);
646 spin_unlock_irqrestore(&vdev->priv_lock, flags);
647 }
648
649 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
650 {
651 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
652 struct vhci *vhci = vhci_hcd->vhci;
653 struct device *dev = &urb->dev->dev;
654 u8 portnum = urb->dev->portnum;
655 int ret = 0;
656 struct vhci_device *vdev;
657 unsigned long flags;
658
659 if (portnum > VHCI_HC_PORTS) {
660 pr_err("invalid port number %d\n", portnum);
661 return -ENODEV;
662 }
663 vdev = &vhci_hcd->vdev[portnum-1];
664
665 /* patch to usb_sg_init() is in 2.5.60 */
666 BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length);
667
668 spin_lock_irqsave(&vhci->lock, flags);
669
670 if (urb->status != -EINPROGRESS) {
671 dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
672 spin_unlock_irqrestore(&vhci->lock, flags);
673 return urb->status;
674 }
675
676 /* refuse enqueue for dead connection */
677 spin_lock(&vdev->ud.lock);
678 if (vdev->ud.status == VDEV_ST_NULL ||
679 vdev->ud.status == VDEV_ST_ERROR) {
680 dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport);
681 spin_unlock(&vdev->ud.lock);
682 spin_unlock_irqrestore(&vhci->lock, flags);
683 return -ENODEV;
684 }
685 spin_unlock(&vdev->ud.lock);
686
687 ret = usb_hcd_link_urb_to_ep(hcd, urb);
688 if (ret)
689 goto no_need_unlink;
690
691 /*
692 * The enumeration process is as follows;
693 *
694 * 1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
695 * to get max packet length of default pipe
696 *
697 * 2. Set_Address request to DevAddr(0) EndPoint(0)
698 *
699 */
700 if (usb_pipedevice(urb->pipe) == 0) {
701 __u8 type = usb_pipetype(urb->pipe);
702 struct usb_ctrlrequest *ctrlreq =
703 (struct usb_ctrlrequest *) urb->setup_packet;
704
705 if (type != PIPE_CONTROL || !ctrlreq) {
706 dev_err(dev, "invalid request to devnum 0\n");
707 ret = -EINVAL;
708 goto no_need_xmit;
709 }
710
711 switch (ctrlreq->bRequest) {
712 case USB_REQ_SET_ADDRESS:
713 /* set_address may come when a device is reset */
714 dev_info(dev, "SetAddress Request (%d) to port %d\n",
715 ctrlreq->wValue, vdev->rhport);
716
717 usb_put_dev(vdev->udev);
718 vdev->udev = usb_get_dev(urb->dev);
719
720 spin_lock(&vdev->ud.lock);
721 vdev->ud.status = VDEV_ST_USED;
722 spin_unlock(&vdev->ud.lock);
723
724 if (urb->status == -EINPROGRESS) {
725 /* This request is successfully completed. */
726 /* If not -EINPROGRESS, possibly unlinked. */
727 urb->status = 0;
728 }
729
730 goto no_need_xmit;
731
732 case USB_REQ_GET_DESCRIPTOR:
733 if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8))
734 usbip_dbg_vhci_hc(
735 "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n");
736
737 usb_put_dev(vdev->udev);
738 vdev->udev = usb_get_dev(urb->dev);
739 goto out;
740
741 default:
742 /* NOT REACHED */
743 dev_err(dev,
744 "invalid request to devnum 0 bRequest %u, wValue %u\n",
745 ctrlreq->bRequest,
746 ctrlreq->wValue);
747 ret = -EINVAL;
748 goto no_need_xmit;
749 }
750
751 }
752
753 out:
754 vhci_tx_urb(urb, vdev);
755 spin_unlock_irqrestore(&vhci->lock, flags);
756
757 return 0;
758
759 no_need_xmit:
760 usb_hcd_unlink_urb_from_ep(hcd, urb);
761 no_need_unlink:
762 spin_unlock_irqrestore(&vhci->lock, flags);
763 if (!ret)
764 usb_hcd_giveback_urb(hcd, urb, urb->status);
765 return ret;
766 }
767
768 /*
769 * vhci_rx gives back the urb after receiving the reply of the urb. If an
770 * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
771 * back its urb. For the driver unlinking the urb, the content of the urb is
772 * not important, but the calling to its completion handler is important; the
773 * completion of unlinking is notified by the completion handler.
774 *
775 *
776 * CLIENT SIDE
777 *
778 * - When vhci_hcd receives RET_SUBMIT,
779 *
780 * - case 1a). the urb of the pdu is not unlinking.
781 * - normal case
782 * => just give back the urb
783 *
784 * - case 1b). the urb of the pdu is unlinking.
785 * - usbip.ko will return a reply of the unlinking request.
786 * => give back the urb now and go to case 2b).
787 *
788 * - When vhci_hcd receives RET_UNLINK,
789 *
790 * - case 2a). a submit request is still pending in vhci_hcd.
791 * - urb was really pending in usbip.ko and urb_unlink_urb() was
792 * completed there.
793 * => free a pending submit request
794 * => notify unlink completeness by giving back the urb
795 *
796 * - case 2b). a submit request is *not* pending in vhci_hcd.
797 * - urb was already given back to the core driver.
798 * => do not give back the urb
799 *
800 *
801 * SERVER SIDE
802 *
803 * - When usbip receives CMD_UNLINK,
804 *
805 * - case 3a). the urb of the unlink request is now in submission.
806 * => do usb_unlink_urb().
807 * => after the unlink is completed, send RET_UNLINK.
808 *
809 * - case 3b). the urb of the unlink request is not in submission.
810 * - may be already completed or never be received
811 * => send RET_UNLINK
812 *
813 */
814 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
815 {
816 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
817 struct vhci *vhci = vhci_hcd->vhci;
818 struct vhci_priv *priv;
819 struct vhci_device *vdev;
820 unsigned long flags;
821
822 spin_lock_irqsave(&vhci->lock, flags);
823
824 priv = urb->hcpriv;
825 if (!priv) {
826 /* URB was never linked! or will be soon given back by
827 * vhci_rx. */
828 spin_unlock_irqrestore(&vhci->lock, flags);
829 return -EIDRM;
830 }
831
832 {
833 int ret = 0;
834
835 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
836 if (ret) {
837 spin_unlock_irqrestore(&vhci->lock, flags);
838 return ret;
839 }
840 }
841
842 /* send unlink request here? */
843 vdev = priv->vdev;
844
845 if (!vdev->ud.tcp_socket) {
846 /* tcp connection is closed */
847 spin_lock(&vdev->priv_lock);
848
849 list_del(&priv->list);
850 kfree(priv);
851 urb->hcpriv = NULL;
852
853 spin_unlock(&vdev->priv_lock);
854
855 /*
856 * If tcp connection is alive, we have sent CMD_UNLINK.
857 * vhci_rx will receive RET_UNLINK and give back the URB.
858 * Otherwise, we give back it here.
859 */
860 usb_hcd_unlink_urb_from_ep(hcd, urb);
861
862 spin_unlock_irqrestore(&vhci->lock, flags);
863 usb_hcd_giveback_urb(hcd, urb, urb->status);
864 spin_lock_irqsave(&vhci->lock, flags);
865
866 } else {
867 /* tcp connection is alive */
868 struct vhci_unlink *unlink;
869
870 spin_lock(&vdev->priv_lock);
871
872 /* setup CMD_UNLINK pdu */
873 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC);
874 if (!unlink) {
875 spin_unlock(&vdev->priv_lock);
876 spin_unlock_irqrestore(&vhci->lock, flags);
877 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
878 return -ENOMEM;
879 }
880
881 unlink->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
882 if (unlink->seqnum == 0xffff)
883 pr_info("seqnum max\n");
884
885 unlink->unlink_seqnum = priv->seqnum;
886
887 /* send cmd_unlink and try to cancel the pending URB in the
888 * peer */
889 list_add_tail(&unlink->list, &vdev->unlink_tx);
890 wake_up(&vdev->waitq_tx);
891
892 spin_unlock(&vdev->priv_lock);
893 }
894
895 spin_unlock_irqrestore(&vhci->lock, flags);
896
897 usbip_dbg_vhci_hc("leave\n");
898 return 0;
899 }
900
901 static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
902 {
903 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
904 struct usb_hcd *hcd = vhci_hcd_to_hcd(vhci_hcd);
905 struct vhci *vhci = vhci_hcd->vhci;
906 struct vhci_unlink *unlink, *tmp;
907 unsigned long flags;
908
909 spin_lock_irqsave(&vhci->lock, flags);
910 spin_lock(&vdev->priv_lock);
911
912 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
913 pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum);
914 list_del(&unlink->list);
915 kfree(unlink);
916 }
917
918 while (!list_empty(&vdev->unlink_rx)) {
919 struct urb *urb;
920
921 unlink = list_first_entry(&vdev->unlink_rx, struct vhci_unlink,
922 list);
923
924 /* give back URB of unanswered unlink request */
925 pr_info("unlink cleanup rx %lu\n", unlink->unlink_seqnum);
926
927 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
928 if (!urb) {
929 pr_info("the urb (seqnum %lu) was already given back\n",
930 unlink->unlink_seqnum);
931 list_del(&unlink->list);
932 kfree(unlink);
933 continue;
934 }
935
936 urb->status = -ENODEV;
937
938 usb_hcd_unlink_urb_from_ep(hcd, urb);
939
940 list_del(&unlink->list);
941
942 spin_unlock(&vdev->priv_lock);
943 spin_unlock_irqrestore(&vhci->lock, flags);
944
945 usb_hcd_giveback_urb(hcd, urb, urb->status);
946
947 spin_lock_irqsave(&vhci->lock, flags);
948 spin_lock(&vdev->priv_lock);
949
950 kfree(unlink);
951 }
952
953 spin_unlock(&vdev->priv_lock);
954 spin_unlock_irqrestore(&vhci->lock, flags);
955 }
956
957 /*
958 * The important thing is that only one context begins cleanup.
959 * This is why error handling and cleanup become simple.
960 * We do not want to consider race condition as possible.
961 */
962 static void vhci_shutdown_connection(struct usbip_device *ud)
963 {
964 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
965
966 /* need this? see stub_dev.c */
967 if (ud->tcp_socket) {
968 pr_debug("shutdown tcp_socket %d\n", ud->sockfd);
969 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
970 }
971
972 /* kill threads related to this sdev */
973 if (vdev->ud.tcp_rx) {
974 kthread_stop_put(vdev->ud.tcp_rx);
975 vdev->ud.tcp_rx = NULL;
976 }
977 if (vdev->ud.tcp_tx) {
978 kthread_stop_put(vdev->ud.tcp_tx);
979 vdev->ud.tcp_tx = NULL;
980 }
981 pr_info("stop threads\n");
982
983 /* active connection is closed */
984 if (vdev->ud.tcp_socket) {
985 sockfd_put(vdev->ud.tcp_socket);
986 vdev->ud.tcp_socket = NULL;
987 }
988 pr_info("release socket\n");
989
990 vhci_device_unlink_cleanup(vdev);
991
992 /*
993 * rh_port_disconnect() is a trigger of ...
994 * usb_disable_device():
995 * disable all the endpoints for a USB device.
996 * usb_disable_endpoint():
997 * disable endpoints. pending urbs are unlinked(dequeued).
998 *
999 * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
1000 * detached device should release used urbs in a cleanup function (i.e.
1001 * xxx_disconnect()). Therefore, vhci_hcd does not need to release
1002 * pushed urbs and their private data in this function.
1003 *
1004 * NOTE: vhci_dequeue() must be considered carefully. When shutting down
1005 * a connection, vhci_shutdown_connection() expects vhci_dequeue()
1006 * gives back pushed urbs and frees their private data by request of
1007 * the cleanup function of a USB driver. When unlinking a urb with an
1008 * active connection, vhci_dequeue() does not give back the urb which
1009 * is actually given back by vhci_rx after receiving its return pdu.
1010 *
1011 */
1012 rh_port_disconnect(vdev);
1013
1014 pr_info("disconnect device\n");
1015 }
1016
1017 static void vhci_device_reset(struct usbip_device *ud)
1018 {
1019 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
1020 unsigned long flags;
1021
1022 spin_lock_irqsave(&ud->lock, flags);
1023
1024 vdev->speed = 0;
1025 vdev->devid = 0;
1026
1027 usb_put_dev(vdev->udev);
1028 vdev->udev = NULL;
1029
1030 if (ud->tcp_socket) {
1031 sockfd_put(ud->tcp_socket);
1032 ud->tcp_socket = NULL;
1033 }
1034 ud->status = VDEV_ST_NULL;
1035
1036 spin_unlock_irqrestore(&ud->lock, flags);
1037 }
1038
1039 static void vhci_device_unusable(struct usbip_device *ud)
1040 {
1041 unsigned long flags;
1042
1043 spin_lock_irqsave(&ud->lock, flags);
1044 ud->status = VDEV_ST_ERROR;
1045 spin_unlock_irqrestore(&ud->lock, flags);
1046 }
1047
1048 static void vhci_device_init(struct vhci_device *vdev)
1049 {
1050 memset(vdev, 0, sizeof(struct vhci_device));
1051
1052 vdev->ud.side = USBIP_VHCI;
1053 vdev->ud.status = VDEV_ST_NULL;
1054 spin_lock_init(&vdev->ud.lock);
1055
1056 INIT_LIST_HEAD(&vdev->priv_rx);
1057 INIT_LIST_HEAD(&vdev->priv_tx);
1058 INIT_LIST_HEAD(&vdev->unlink_tx);
1059 INIT_LIST_HEAD(&vdev->unlink_rx);
1060 spin_lock_init(&vdev->priv_lock);
1061
1062 init_waitqueue_head(&vdev->waitq_tx);
1063
1064 vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
1065 vdev->ud.eh_ops.reset = vhci_device_reset;
1066 vdev->ud.eh_ops.unusable = vhci_device_unusable;
1067
1068 usbip_start_eh(&vdev->ud);
1069 }
1070
1071 static int hcd_name_to_id(const char *name)
1072 {
1073 char *c;
1074 long val;
1075 int ret;
1076
1077 c = strchr(name, '.');
1078 if (c == NULL)
1079 return 0;
1080
1081 ret = kstrtol(c+1, 10, &val);
1082 if (ret < 0)
1083 return ret;
1084
1085 return val;
1086 }
1087
1088 static int vhci_setup(struct usb_hcd *hcd)
1089 {
1090 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1091 if (usb_hcd_is_primary_hcd(hcd)) {
1092 vhci->vhci_hcd_hs = hcd_to_vhci_hcd(hcd);
1093 vhci->vhci_hcd_hs->vhci = vhci;
1094 /*
1095 * Mark the first roothub as being USB 2.0.
1096 * The USB 3.0 roothub will be registered later by
1097 * vhci_hcd_probe()
1098 */
1099 hcd->speed = HCD_USB2;
1100 hcd->self.root_hub->speed = USB_SPEED_HIGH;
1101 } else {
1102 vhci->vhci_hcd_ss = hcd_to_vhci_hcd(hcd);
1103 vhci->vhci_hcd_ss->vhci = vhci;
1104 hcd->speed = HCD_USB3;
1105 hcd->self.root_hub->speed = USB_SPEED_SUPER;
1106 }
1107 return 0;
1108 }
1109
1110 static int vhci_start(struct usb_hcd *hcd)
1111 {
1112 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1113 int id, rhport;
1114 int err;
1115
1116 usbip_dbg_vhci_hc("enter vhci_start\n");
1117
1118 if (usb_hcd_is_primary_hcd(hcd))
1119 spin_lock_init(&vhci_hcd->vhci->lock);
1120
1121 /* initialize private data of usb_hcd */
1122
1123 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1124 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1125
1126 vhci_device_init(vdev);
1127 vdev->rhport = rhport;
1128 }
1129
1130 atomic_set(&vhci_hcd->seqnum, 0);
1131
1132 hcd->power_budget = 0; /* no limit */
1133 hcd->uses_new_polling = 1;
1134
1135 #ifdef CONFIG_USB_OTG
1136 hcd->self.otg_port = 1;
1137 #endif
1138
1139 id = hcd_name_to_id(hcd_name(hcd));
1140 if (id < 0) {
1141 pr_err("invalid vhci name %s\n", hcd_name(hcd));
1142 return -EINVAL;
1143 }
1144
1145 /* vhci_hcd is now ready to be controlled through sysfs */
1146 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1147 err = vhci_init_attr_group();
1148 if (err) {
1149 pr_err("init attr group\n");
1150 return err;
1151 }
1152 err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1153 if (err) {
1154 pr_err("create sysfs files\n");
1155 vhci_finish_attr_group();
1156 return err;
1157 }
1158 pr_info("created sysfs %s\n", hcd_name(hcd));
1159 }
1160
1161 return 0;
1162 }
1163
1164 static void vhci_stop(struct usb_hcd *hcd)
1165 {
1166 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1167 int id, rhport;
1168
1169 usbip_dbg_vhci_hc("stop VHCI controller\n");
1170
1171 /* 1. remove the userland interface of vhci_hcd */
1172 id = hcd_name_to_id(hcd_name(hcd));
1173 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1174 sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1175 vhci_finish_attr_group();
1176 }
1177
1178 /* 2. shutdown all the ports of vhci_hcd */
1179 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1180 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1181
1182 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
1183 usbip_stop_eh(&vdev->ud);
1184 }
1185 }
1186
1187 static int vhci_get_frame_number(struct usb_hcd *hcd)
1188 {
1189 dev_err_ratelimited(&hcd->self.root_hub->dev, "Not yet implemented\n");
1190 return 0;
1191 }
1192
1193 #ifdef CONFIG_PM
1194
1195 /* FIXME: suspend/resume */
1196 static int vhci_bus_suspend(struct usb_hcd *hcd)
1197 {
1198 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1199 unsigned long flags;
1200
1201 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1202
1203 spin_lock_irqsave(&vhci->lock, flags);
1204 hcd->state = HC_STATE_SUSPENDED;
1205 spin_unlock_irqrestore(&vhci->lock, flags);
1206
1207 return 0;
1208 }
1209
1210 static int vhci_bus_resume(struct usb_hcd *hcd)
1211 {
1212 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1213 int rc = 0;
1214 unsigned long flags;
1215
1216 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1217
1218 spin_lock_irqsave(&vhci->lock, flags);
1219 if (!HCD_HW_ACCESSIBLE(hcd))
1220 rc = -ESHUTDOWN;
1221 else
1222 hcd->state = HC_STATE_RUNNING;
1223 spin_unlock_irqrestore(&vhci->lock, flags);
1224
1225 return rc;
1226 }
1227
1228 #else
1229
1230 #define vhci_bus_suspend NULL
1231 #define vhci_bus_resume NULL
1232 #endif
1233
1234 /* Change a group of bulk endpoints to support multiple stream IDs */
1235 static int vhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
1236 struct usb_host_endpoint **eps, unsigned int num_eps,
1237 unsigned int num_streams, gfp_t mem_flags)
1238 {
1239 dev_dbg(&hcd->self.root_hub->dev, "vhci_alloc_streams not implemented\n");
1240 return 0;
1241 }
1242
1243 /* Reverts a group of bulk endpoints back to not using stream IDs. */
1244 static int vhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
1245 struct usb_host_endpoint **eps, unsigned int num_eps,
1246 gfp_t mem_flags)
1247 {
1248 dev_dbg(&hcd->self.root_hub->dev, "vhci_free_streams not implemented\n");
1249 return 0;
1250 }
1251
1252 static const struct hc_driver vhci_hc_driver = {
1253 .description = driver_name,
1254 .product_desc = driver_desc,
1255 .hcd_priv_size = sizeof(struct vhci_hcd),
1256
1257 .flags = HCD_USB3 | HCD_SHARED,
1258
1259 .reset = vhci_setup,
1260 .start = vhci_start,
1261 .stop = vhci_stop,
1262
1263 .urb_enqueue = vhci_urb_enqueue,
1264 .urb_dequeue = vhci_urb_dequeue,
1265
1266 .get_frame_number = vhci_get_frame_number,
1267
1268 .hub_status_data = vhci_hub_status,
1269 .hub_control = vhci_hub_control,
1270 .bus_suspend = vhci_bus_suspend,
1271 .bus_resume = vhci_bus_resume,
1272
1273 .alloc_streams = vhci_alloc_streams,
1274 .free_streams = vhci_free_streams,
1275 };
1276
1277 static int vhci_hcd_probe(struct platform_device *pdev)
1278 {
1279 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev));
1280 struct usb_hcd *hcd_hs;
1281 struct usb_hcd *hcd_ss;
1282 int ret;
1283
1284 usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
1285
1286 /*
1287 * Allocate and initialize hcd.
1288 * Our private data is also allocated automatically.
1289 */
1290 hcd_hs = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1291 if (!hcd_hs) {
1292 pr_err("create primary hcd failed\n");
1293 return -ENOMEM;
1294 }
1295 hcd_hs->has_tt = 1;
1296
1297 /*
1298 * Finish generic HCD structure initialization and register.
1299 * Call the driver's reset() and start() routines.
1300 */
1301 ret = usb_add_hcd(hcd_hs, 0, 0);
1302 if (ret != 0) {
1303 pr_err("usb_add_hcd hs failed %d\n", ret);
1304 goto put_usb2_hcd;
1305 }
1306
1307 hcd_ss = usb_create_shared_hcd(&vhci_hc_driver, &pdev->dev,
1308 dev_name(&pdev->dev), hcd_hs);
1309 if (!hcd_ss) {
1310 ret = -ENOMEM;
1311 pr_err("create shared hcd failed\n");
1312 goto remove_usb2_hcd;
1313 }
1314
1315 ret = usb_add_hcd(hcd_ss, 0, 0);
1316 if (ret) {
1317 pr_err("usb_add_hcd ss failed %d\n", ret);
1318 goto put_usb3_hcd;
1319 }
1320
1321 usbip_dbg_vhci_hc("bye\n");
1322 return 0;
1323
1324 put_usb3_hcd:
1325 usb_put_hcd(hcd_ss);
1326 remove_usb2_hcd:
1327 usb_remove_hcd(hcd_hs);
1328 put_usb2_hcd:
1329 usb_put_hcd(hcd_hs);
1330 vhci->vhci_hcd_hs = NULL;
1331 vhci->vhci_hcd_ss = NULL;
1332 return ret;
1333 }
1334
1335 static int vhci_hcd_remove(struct platform_device *pdev)
1336 {
1337 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev));
1338
1339 /*
1340 * Disconnects the root hub,
1341 * then reverses the effects of usb_add_hcd(),
1342 * invoking the HCD's stop() methods.
1343 */
1344 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1345 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1346
1347 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1348 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1349
1350 vhci->vhci_hcd_hs = NULL;
1351 vhci->vhci_hcd_ss = NULL;
1352
1353 return 0;
1354 }
1355
1356 #ifdef CONFIG_PM
1357
1358 /* what should happen for USB/IP under suspend/resume? */
1359 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1360 {
1361 struct usb_hcd *hcd;
1362 struct vhci *vhci;
1363 int rhport;
1364 int connected = 0;
1365 int ret = 0;
1366 unsigned long flags;
1367
1368 dev_dbg(&pdev->dev, "%s\n", __func__);
1369
1370 hcd = platform_get_drvdata(pdev);
1371 if (!hcd)
1372 return 0;
1373
1374 vhci = *((void **)dev_get_platdata(hcd->self.controller));
1375
1376 spin_lock_irqsave(&vhci->lock, flags);
1377
1378 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1379 if (vhci->vhci_hcd_hs->port_status[rhport] &
1380 USB_PORT_STAT_CONNECTION)
1381 connected += 1;
1382
1383 if (vhci->vhci_hcd_ss->port_status[rhport] &
1384 USB_PORT_STAT_CONNECTION)
1385 connected += 1;
1386 }
1387
1388 spin_unlock_irqrestore(&vhci->lock, flags);
1389
1390 if (connected > 0) {
1391 dev_info(&pdev->dev,
1392 "We have %d active connection%s. Do not suspend.\n",
1393 connected, (connected == 1 ? "" : "s"));
1394 ret = -EBUSY;
1395 } else {
1396 dev_info(&pdev->dev, "suspend vhci_hcd");
1397 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1398 }
1399
1400 return ret;
1401 }
1402
1403 static int vhci_hcd_resume(struct platform_device *pdev)
1404 {
1405 struct usb_hcd *hcd;
1406
1407 dev_dbg(&pdev->dev, "%s\n", __func__);
1408
1409 hcd = platform_get_drvdata(pdev);
1410 if (!hcd)
1411 return 0;
1412 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1413 usb_hcd_poll_rh_status(hcd);
1414
1415 return 0;
1416 }
1417
1418 #else
1419
1420 #define vhci_hcd_suspend NULL
1421 #define vhci_hcd_resume NULL
1422
1423 #endif
1424
1425 static struct platform_driver vhci_driver = {
1426 .probe = vhci_hcd_probe,
1427 .remove = vhci_hcd_remove,
1428 .suspend = vhci_hcd_suspend,
1429 .resume = vhci_hcd_resume,
1430 .driver = {
1431 .name = driver_name,
1432 },
1433 };
1434
1435 static void del_platform_devices(void)
1436 {
1437 struct platform_device *pdev;
1438 int i;
1439
1440 for (i = 0; i < vhci_num_controllers; i++) {
1441 pdev = vhcis[i].pdev;
1442 if (pdev != NULL)
1443 platform_device_unregister(pdev);
1444 vhcis[i].pdev = NULL;
1445 }
1446 sysfs_remove_link(&platform_bus.kobj, driver_name);
1447 }
1448
1449 static int __init vhci_hcd_init(void)
1450 {
1451 int i, ret;
1452
1453 if (usb_disabled())
1454 return -ENODEV;
1455
1456 if (vhci_num_controllers < 1)
1457 vhci_num_controllers = 1;
1458
1459 vhcis = kcalloc(vhci_num_controllers, sizeof(struct vhci), GFP_KERNEL);
1460 if (vhcis == NULL)
1461 return -ENOMEM;
1462
1463 for (i = 0; i < vhci_num_controllers; i++) {
1464 vhcis[i].pdev = platform_device_alloc(driver_name, i);
1465 if (!vhcis[i].pdev) {
1466 i--;
1467 while (i >= 0)
1468 platform_device_put(vhcis[i--].pdev);
1469 ret = -ENOMEM;
1470 goto err_device_alloc;
1471 }
1472 }
1473 for (i = 0; i < vhci_num_controllers; i++) {
1474 void *vhci = &vhcis[i];
1475 ret = platform_device_add_data(vhcis[i].pdev, &vhci, sizeof(void *));
1476 if (ret)
1477 goto err_driver_register;
1478 }
1479
1480 ret = platform_driver_register(&vhci_driver);
1481 if (ret)
1482 goto err_driver_register;
1483
1484 for (i = 0; i < vhci_num_controllers; i++) {
1485 ret = platform_device_add(vhcis[i].pdev);
1486 if (ret < 0) {
1487 i--;
1488 while (i >= 0)
1489 platform_device_del(vhcis[i--].pdev);
1490 goto err_add_hcd;
1491 }
1492 }
1493
1494 return ret;
1495
1496 err_add_hcd:
1497 platform_driver_unregister(&vhci_driver);
1498 err_driver_register:
1499 for (i = 0; i < vhci_num_controllers; i++)
1500 platform_device_put(vhcis[i].pdev);
1501 err_device_alloc:
1502 kfree(vhcis);
1503 return ret;
1504 }
1505
1506 static void __exit vhci_hcd_exit(void)
1507 {
1508 del_platform_devices();
1509 platform_driver_unregister(&vhci_driver);
1510 kfree(vhcis);
1511 }
1512
1513 module_init(vhci_hcd_init);
1514 module_exit(vhci_hcd_exit);
1515
1516 MODULE_AUTHOR(DRIVER_AUTHOR);
1517 MODULE_DESCRIPTION(DRIVER_DESC);
1518 MODULE_LICENSE("GPL");
CRIS linux kernel tree