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mei: me: add cannon point device ids
[linux/fpc-iii.git] / drivers / usb / usbip / vhci_hcd.c
blob20e3d4609583848f8a14271d5c4bf3ffb8776123
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 vdev->ud.sockfd = -1;
988 }
989 pr_info("release socket\n");
990
991 vhci_device_unlink_cleanup(vdev);
992
993 /*
994 * rh_port_disconnect() is a trigger of ...
995 * usb_disable_device():
996 * disable all the endpoints for a USB device.
997 * usb_disable_endpoint():
998 * disable endpoints. pending urbs are unlinked(dequeued).
999 *
1000 * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
1001 * detached device should release used urbs in a cleanup function (i.e.
1002 * xxx_disconnect()). Therefore, vhci_hcd does not need to release
1003 * pushed urbs and their private data in this function.
1004 *
1005 * NOTE: vhci_dequeue() must be considered carefully. When shutting down
1006 * a connection, vhci_shutdown_connection() expects vhci_dequeue()
1007 * gives back pushed urbs and frees their private data by request of
1008 * the cleanup function of a USB driver. When unlinking a urb with an
1009 * active connection, vhci_dequeue() does not give back the urb which
1010 * is actually given back by vhci_rx after receiving its return pdu.
1011 *
1012 */
1013 rh_port_disconnect(vdev);
1014
1015 pr_info("disconnect device\n");
1016 }
1017
1018 static void vhci_device_reset(struct usbip_device *ud)
1019 {
1020 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
1021 unsigned long flags;
1022
1023 spin_lock_irqsave(&ud->lock, flags);
1024
1025 vdev->speed = 0;
1026 vdev->devid = 0;
1027
1028 usb_put_dev(vdev->udev);
1029 vdev->udev = NULL;
1030
1031 if (ud->tcp_socket) {
1032 sockfd_put(ud->tcp_socket);
1033 ud->tcp_socket = NULL;
1034 ud->sockfd = -1;
1035 }
1036 ud->status = VDEV_ST_NULL;
1037
1038 spin_unlock_irqrestore(&ud->lock, flags);
1039 }
1040
1041 static void vhci_device_unusable(struct usbip_device *ud)
1042 {
1043 unsigned long flags;
1044
1045 spin_lock_irqsave(&ud->lock, flags);
1046 ud->status = VDEV_ST_ERROR;
1047 spin_unlock_irqrestore(&ud->lock, flags);
1048 }
1049
1050 static void vhci_device_init(struct vhci_device *vdev)
1051 {
1052 memset(vdev, 0, sizeof(struct vhci_device));
1053
1054 vdev->ud.side = USBIP_VHCI;
1055 vdev->ud.status = VDEV_ST_NULL;
1056 spin_lock_init(&vdev->ud.lock);
1057
1058 INIT_LIST_HEAD(&vdev->priv_rx);
1059 INIT_LIST_HEAD(&vdev->priv_tx);
1060 INIT_LIST_HEAD(&vdev->unlink_tx);
1061 INIT_LIST_HEAD(&vdev->unlink_rx);
1062 spin_lock_init(&vdev->priv_lock);
1063
1064 init_waitqueue_head(&vdev->waitq_tx);
1065
1066 vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
1067 vdev->ud.eh_ops.reset = vhci_device_reset;
1068 vdev->ud.eh_ops.unusable = vhci_device_unusable;
1069
1070 usbip_start_eh(&vdev->ud);
1071 }
1072
1073 static int hcd_name_to_id(const char *name)
1074 {
1075 char *c;
1076 long val;
1077 int ret;
1078
1079 c = strchr(name, '.');
1080 if (c == NULL)
1081 return 0;
1082
1083 ret = kstrtol(c+1, 10, &val);
1084 if (ret < 0)
1085 return ret;
1086
1087 return val;
1088 }
1089
1090 static int vhci_setup(struct usb_hcd *hcd)
1091 {
1092 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1093 if (usb_hcd_is_primary_hcd(hcd)) {
1094 vhci->vhci_hcd_hs = hcd_to_vhci_hcd(hcd);
1095 vhci->vhci_hcd_hs->vhci = vhci;
1096 /*
1097 * Mark the first roothub as being USB 2.0.
1098 * The USB 3.0 roothub will be registered later by
1099 * vhci_hcd_probe()
1100 */
1101 hcd->speed = HCD_USB2;
1102 hcd->self.root_hub->speed = USB_SPEED_HIGH;
1103 } else {
1104 vhci->vhci_hcd_ss = hcd_to_vhci_hcd(hcd);
1105 vhci->vhci_hcd_ss->vhci = vhci;
1106 hcd->speed = HCD_USB3;
1107 hcd->self.root_hub->speed = USB_SPEED_SUPER;
1108 }
1109 return 0;
1110 }
1111
1112 static int vhci_start(struct usb_hcd *hcd)
1113 {
1114 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1115 int id, rhport;
1116 int err;
1117
1118 usbip_dbg_vhci_hc("enter vhci_start\n");
1119
1120 if (usb_hcd_is_primary_hcd(hcd))
1121 spin_lock_init(&vhci_hcd->vhci->lock);
1122
1123 /* initialize private data of usb_hcd */
1124
1125 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1126 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1127
1128 vhci_device_init(vdev);
1129 vdev->rhport = rhport;
1130 }
1131
1132 atomic_set(&vhci_hcd->seqnum, 0);
1133
1134 hcd->power_budget = 0; /* no limit */
1135 hcd->uses_new_polling = 1;
1136
1137 #ifdef CONFIG_USB_OTG
1138 hcd->self.otg_port = 1;
1139 #endif
1140
1141 id = hcd_name_to_id(hcd_name(hcd));
1142 if (id < 0) {
1143 pr_err("invalid vhci name %s\n", hcd_name(hcd));
1144 return -EINVAL;
1145 }
1146
1147 /* vhci_hcd is now ready to be controlled through sysfs */
1148 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1149 err = vhci_init_attr_group();
1150 if (err) {
1151 pr_err("init attr group\n");
1152 return err;
1153 }
1154 err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1155 if (err) {
1156 pr_err("create sysfs files\n");
1157 vhci_finish_attr_group();
1158 return err;
1159 }
1160 pr_info("created sysfs %s\n", hcd_name(hcd));
1161 }
1162
1163 return 0;
1164 }
1165
1166 static void vhci_stop(struct usb_hcd *hcd)
1167 {
1168 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1169 int id, rhport;
1170
1171 usbip_dbg_vhci_hc("stop VHCI controller\n");
1172
1173 /* 1. remove the userland interface of vhci_hcd */
1174 id = hcd_name_to_id(hcd_name(hcd));
1175 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1176 sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1177 vhci_finish_attr_group();
1178 }
1179
1180 /* 2. shutdown all the ports of vhci_hcd */
1181 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1182 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1183
1184 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
1185 usbip_stop_eh(&vdev->ud);
1186 }
1187 }
1188
1189 static int vhci_get_frame_number(struct usb_hcd *hcd)
1190 {
1191 dev_err_ratelimited(&hcd->self.root_hub->dev, "Not yet implemented\n");
1192 return 0;
1193 }
1194
1195 #ifdef CONFIG_PM
1196
1197 /* FIXME: suspend/resume */
1198 static int vhci_bus_suspend(struct usb_hcd *hcd)
1199 {
1200 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1201 unsigned long flags;
1202
1203 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1204
1205 spin_lock_irqsave(&vhci->lock, flags);
1206 hcd->state = HC_STATE_SUSPENDED;
1207 spin_unlock_irqrestore(&vhci->lock, flags);
1208
1209 return 0;
1210 }
1211
1212 static int vhci_bus_resume(struct usb_hcd *hcd)
1213 {
1214 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1215 int rc = 0;
1216 unsigned long flags;
1217
1218 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1219
1220 spin_lock_irqsave(&vhci->lock, flags);
1221 if (!HCD_HW_ACCESSIBLE(hcd))
1222 rc = -ESHUTDOWN;
1223 else
1224 hcd->state = HC_STATE_RUNNING;
1225 spin_unlock_irqrestore(&vhci->lock, flags);
1226
1227 return rc;
1228 }
1229
1230 #else
1231
1232 #define vhci_bus_suspend NULL
1233 #define vhci_bus_resume NULL
1234 #endif
1235
1236 /* Change a group of bulk endpoints to support multiple stream IDs */
1237 static int vhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
1238 struct usb_host_endpoint **eps, unsigned int num_eps,
1239 unsigned int num_streams, gfp_t mem_flags)
1240 {
1241 dev_dbg(&hcd->self.root_hub->dev, "vhci_alloc_streams not implemented\n");
1242 return 0;
1243 }
1244
1245 /* Reverts a group of bulk endpoints back to not using stream IDs. */
1246 static int vhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
1247 struct usb_host_endpoint **eps, unsigned int num_eps,
1248 gfp_t mem_flags)
1249 {
1250 dev_dbg(&hcd->self.root_hub->dev, "vhci_free_streams not implemented\n");
1251 return 0;
1252 }
1253
1254 static const struct hc_driver vhci_hc_driver = {
1255 .description = driver_name,
1256 .product_desc = driver_desc,
1257 .hcd_priv_size = sizeof(struct vhci_hcd),
1258
1259 .flags = HCD_USB3 | HCD_SHARED,
1260
1261 .reset = vhci_setup,
1262 .start = vhci_start,
1263 .stop = vhci_stop,
1264
1265 .urb_enqueue = vhci_urb_enqueue,
1266 .urb_dequeue = vhci_urb_dequeue,
1267
1268 .get_frame_number = vhci_get_frame_number,
1269
1270 .hub_status_data = vhci_hub_status,
1271 .hub_control = vhci_hub_control,
1272 .bus_suspend = vhci_bus_suspend,
1273 .bus_resume = vhci_bus_resume,
1274
1275 .alloc_streams = vhci_alloc_streams,
1276 .free_streams = vhci_free_streams,
1277 };
1278
1279 static int vhci_hcd_probe(struct platform_device *pdev)
1280 {
1281 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev));
1282 struct usb_hcd *hcd_hs;
1283 struct usb_hcd *hcd_ss;
1284 int ret;
1285
1286 usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
1287
1288 /*
1289 * Allocate and initialize hcd.
1290 * Our private data is also allocated automatically.
1291 */
1292 hcd_hs = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1293 if (!hcd_hs) {
1294 pr_err("create primary hcd failed\n");
1295 return -ENOMEM;
1296 }
1297 hcd_hs->has_tt = 1;
1298
1299 /*
1300 * Finish generic HCD structure initialization and register.
1301 * Call the driver's reset() and start() routines.
1302 */
1303 ret = usb_add_hcd(hcd_hs, 0, 0);
1304 if (ret != 0) {
1305 pr_err("usb_add_hcd hs failed %d\n", ret);
1306 goto put_usb2_hcd;
1307 }
1308
1309 hcd_ss = usb_create_shared_hcd(&vhci_hc_driver, &pdev->dev,
1310 dev_name(&pdev->dev), hcd_hs);
1311 if (!hcd_ss) {
1312 ret = -ENOMEM;
1313 pr_err("create shared hcd failed\n");
1314 goto remove_usb2_hcd;
1315 }
1316
1317 ret = usb_add_hcd(hcd_ss, 0, 0);
1318 if (ret) {
1319 pr_err("usb_add_hcd ss failed %d\n", ret);
1320 goto put_usb3_hcd;
1321 }
1322
1323 usbip_dbg_vhci_hc("bye\n");
1324 return 0;
1325
1326 put_usb3_hcd:
1327 usb_put_hcd(hcd_ss);
1328 remove_usb2_hcd:
1329 usb_remove_hcd(hcd_hs);
1330 put_usb2_hcd:
1331 usb_put_hcd(hcd_hs);
1332 vhci->vhci_hcd_hs = NULL;
1333 vhci->vhci_hcd_ss = NULL;
1334 return ret;
1335 }
1336
1337 static int vhci_hcd_remove(struct platform_device *pdev)
1338 {
1339 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev));
1340
1341 /*
1342 * Disconnects the root hub,
1343 * then reverses the effects of usb_add_hcd(),
1344 * invoking the HCD's stop() methods.
1345 */
1346 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1347 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1348
1349 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1350 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1351
1352 vhci->vhci_hcd_hs = NULL;
1353 vhci->vhci_hcd_ss = NULL;
1354
1355 return 0;
1356 }
1357
1358 #ifdef CONFIG_PM
1359
1360 /* what should happen for USB/IP under suspend/resume? */
1361 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1362 {
1363 struct usb_hcd *hcd;
1364 struct vhci *vhci;
1365 int rhport;
1366 int connected = 0;
1367 int ret = 0;
1368 unsigned long flags;
1369
1370 dev_dbg(&pdev->dev, "%s\n", __func__);
1371
1372 hcd = platform_get_drvdata(pdev);
1373 if (!hcd)
1374 return 0;
1375
1376 vhci = *((void **)dev_get_platdata(hcd->self.controller));
1377
1378 spin_lock_irqsave(&vhci->lock, flags);
1379
1380 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1381 if (vhci->vhci_hcd_hs->port_status[rhport] &
1382 USB_PORT_STAT_CONNECTION)
1383 connected += 1;
1384
1385 if (vhci->vhci_hcd_ss->port_status[rhport] &
1386 USB_PORT_STAT_CONNECTION)
1387 connected += 1;
1388 }
1389
1390 spin_unlock_irqrestore(&vhci->lock, flags);
1391
1392 if (connected > 0) {
1393 dev_info(&pdev->dev,
1394 "We have %d active connection%s. Do not suspend.\n",
1395 connected, (connected == 1 ? "" : "s"));
1396 ret = -EBUSY;
1397 } else {
1398 dev_info(&pdev->dev, "suspend vhci_hcd");
1399 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1400 }
1401
1402 return ret;
1403 }
1404
1405 static int vhci_hcd_resume(struct platform_device *pdev)
1406 {
1407 struct usb_hcd *hcd;
1408
1409 dev_dbg(&pdev->dev, "%s\n", __func__);
1410
1411 hcd = platform_get_drvdata(pdev);
1412 if (!hcd)
1413 return 0;
1414 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1415 usb_hcd_poll_rh_status(hcd);
1416
1417 return 0;
1418 }
1419
1420 #else
1421
1422 #define vhci_hcd_suspend NULL
1423 #define vhci_hcd_resume NULL
1424
1425 #endif
1426
1427 static struct platform_driver vhci_driver = {
1428 .probe = vhci_hcd_probe,
1429 .remove = vhci_hcd_remove,
1430 .suspend = vhci_hcd_suspend,
1431 .resume = vhci_hcd_resume,
1432 .driver = {
1433 .name = driver_name,
1434 },
1435 };
1436
1437 static void del_platform_devices(void)
1438 {
1439 struct platform_device *pdev;
1440 int i;
1441
1442 for (i = 0; i < vhci_num_controllers; i++) {
1443 pdev = vhcis[i].pdev;
1444 if (pdev != NULL)
1445 platform_device_unregister(pdev);
1446 vhcis[i].pdev = NULL;
1447 }
1448 sysfs_remove_link(&platform_bus.kobj, driver_name);
1449 }
1450
1451 static int __init vhci_hcd_init(void)
1452 {
1453 int i, ret;
1454
1455 if (usb_disabled())
1456 return -ENODEV;
1457
1458 if (vhci_num_controllers < 1)
1459 vhci_num_controllers = 1;
1460
1461 vhcis = kcalloc(vhci_num_controllers, sizeof(struct vhci), GFP_KERNEL);
1462 if (vhcis == NULL)
1463 return -ENOMEM;
1464
1465 for (i = 0; i < vhci_num_controllers; i++) {
1466 vhcis[i].pdev = platform_device_alloc(driver_name, i);
1467 if (!vhcis[i].pdev) {
1468 i--;
1469 while (i >= 0)
1470 platform_device_put(vhcis[i--].pdev);
1471 ret = -ENOMEM;
1472 goto err_device_alloc;
1473 }
1474 }
1475 for (i = 0; i < vhci_num_controllers; i++) {
1476 void *vhci = &vhcis[i];
1477 ret = platform_device_add_data(vhcis[i].pdev, &vhci, sizeof(void *));
1478 if (ret)
1479 goto err_driver_register;
1480 }
1481
1482 ret = platform_driver_register(&vhci_driver);
1483 if (ret)
1484 goto err_driver_register;
1485
1486 for (i = 0; i < vhci_num_controllers; i++) {
1487 ret = platform_device_add(vhcis[i].pdev);
1488 if (ret < 0) {
1489 i--;
1490 while (i >= 0)
1491 platform_device_del(vhcis[i--].pdev);
1492 goto err_add_hcd;
1493 }
1494 }
1495
1496 return ret;
1497
1498 err_add_hcd:
1499 platform_driver_unregister(&vhci_driver);
1500 err_driver_register:
1501 for (i = 0; i < vhci_num_controllers; i++)
1502 platform_device_put(vhcis[i].pdev);
1503 err_device_alloc:
1504 kfree(vhcis);
1505 return ret;
1506 }
1507
1508 static void __exit vhci_hcd_exit(void)
1509 {
1510 del_platform_devices();
1511 platform_driver_unregister(&vhci_driver);
1512 kfree(vhcis);
1513 }
1514
1515 module_init(vhci_hcd_init);
1516 module_exit(vhci_hcd_exit);
1517
1518 MODULE_AUTHOR(DRIVER_AUTHOR);
1519 MODULE_DESCRIPTION(DRIVER_DESC);
1520 MODULE_LICENSE("GPL");
Linux with added FPC-III support