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Merge branch 'master' into next
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / usbip / vhci_hcd.c
CommitLineData
04679b34
TH		 1/*
2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
3 *
4 * This is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
17 * USA.
18 */
19
5a0e3ad6 20#include <linux/slab.h>
9720b4bc 21#include <linux/kthread.h>
04679b34
TH		 22
23#include "usbip_common.h"
24#include "vhci.h"
25
26#define DRIVER_VERSION "1.0"
27#define DRIVER_AUTHOR "Takahiro Hirofuchi"
28#define DRIVER_DESC "Virtual Host Controller Interface Driver for USB/IP"
29#define DRIVER_LICENCE "GPL"
30MODULE_AUTHOR(DRIVER_AUTHOR);
31MODULE_DESCRIPTION(DRIVER_DESC);
32MODULE_LICENSE(DRIVER_LICENCE);
33
34
35
36/*
37 * TODO
38 * - update root hub emulation
39 * - move the emulation code to userland ?
40 * porting to other operating systems
41 * minimize kernel code
42 * - add suspend/resume code
43 * - clean up everything
44 */
45
46
47/* See usb gadget dummy hcd */
48
49
50static int vhci_hub_status(struct usb_hcd *hcd, char *buff);
51static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
52 u16 wIndex, char *buff, u16 wLength);
53static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
54 gfp_t mem_flags);
55static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
56static int vhci_start(struct usb_hcd *vhci_hcd);
57static void vhci_stop(struct usb_hcd *hcd);
58static int vhci_get_frame_number(struct usb_hcd *hcd);
59
60static const char driver_name[] = "vhci_hcd";
f5e08ca7 61static const char driver_desc[] = "USB/IP Virtual Host Controller";
04679b34
TH		 62
63struct vhci_hcd *the_controller;
64
65static const char *bit_desc[] = {
66 "CONNECTION", /*0*/
67 "ENABLE", /*1*/
68 "SUSPEND", /*2*/
69 "OVER_CURRENT", /*3*/
70 "RESET", /*4*/
71 "R5", /*5*/
72 "R6", /*6*/
73 "R7", /*7*/
74 "POWER", /*8*/
75 "LOWSPEED", /*9*/
76 "HIGHSPEED", /*10*/
77 "PORT_TEST", /*11*/
78 "INDICATOR", /*12*/
79 "R13", /*13*/
80 "R14", /*14*/
81 "R15", /*15*/
82 "C_CONNECTION", /*16*/
83 "C_ENABLE", /*17*/
84 "C_SUSPEND", /*18*/
85 "C_OVER_CURRENT", /*19*/
86 "C_RESET", /*20*/
87 "R21", /*21*/
88 "R22", /*22*/
89 "R23", /*23*/
90 "R24", /*24*/
91 "R25", /*25*/
92 "R26", /*26*/
93 "R27", /*27*/
94 "R28", /*28*/
95 "R29", /*29*/
96 "R30", /*30*/
97 "R31", /*31*/
98};
99
100
101static void dump_port_status(u32 status)
102{
103 int i = 0;
104
105 printk(KERN_DEBUG "status %08x:", status);
106 for (i = 0; i < 32; i++) {
107 if (status & (1 << i))
108 printk(" %s", bit_desc[i]);
109 }
110
111 printk("\n");
112}
113
114
115
116void rh_port_connect(int rhport, enum usb_device_speed speed)
117{
118 unsigned long flags;
119
b8868e45 120 usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport);
04679b34
TH		 121
122 spin_lock_irqsave(&the_controller->lock, flags);
123
124 the_controller->port_status[rhport] |= USB_PORT_STAT_CONNECTION
125 | (1 << USB_PORT_FEAT_C_CONNECTION);
126
127 switch (speed) {
128 case USB_SPEED_HIGH:
129 the_controller->port_status[rhport] |= USB_PORT_STAT_HIGH_SPEED;
130 break;
131 case USB_SPEED_LOW:
132 the_controller->port_status[rhport] |= USB_PORT_STAT_LOW_SPEED;
133 break;
134 default:
135 break;
136 }
137
138 /* spin_lock(&the_controller->vdev[rhport].ud.lock);
139 * the_controller->vdev[rhport].ud.status = VDEV_CONNECT;
140 * spin_unlock(&the_controller->vdev[rhport].ud.lock); */
141
04679b34
TH		 142 spin_unlock_irqrestore(&the_controller->lock, flags);
143
144 usb_hcd_poll_rh_status(vhci_to_hcd(the_controller));
145}
146
147void rh_port_disconnect(int rhport)
148{
149 unsigned long flags;
150
b8868e45 151 usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport);
04679b34
TH		 152
153 spin_lock_irqsave(&the_controller->lock, flags);
154 /* stop_activity(dum, driver); */
155 the_controller->port_status[rhport] &= ~USB_PORT_STAT_CONNECTION;
156 the_controller->port_status[rhport] |=
157 (1 << USB_PORT_FEAT_C_CONNECTION);
158
159
160 /* not yet complete the disconnection
161 * spin_lock(&vdev->ud.lock);
162 * vdev->ud.status = VHC_ST_DISCONNECT;
163 * spin_unlock(&vdev->ud.lock); */
164
165 spin_unlock_irqrestore(&the_controller->lock, flags);
0c9a32f0
MV		 166
167 usb_hcd_poll_rh_status(vhci_to_hcd(the_controller));
04679b34
TH		 168}
169
170
171
172/*----------------------------------------------------------------------*/
173
174#define PORT_C_MASK \
175 ((USB_PORT_STAT_C_CONNECTION \
176 | USB_PORT_STAT_C_ENABLE \
177 | USB_PORT_STAT_C_SUSPEND \
178 | USB_PORT_STAT_C_OVERCURRENT \
179 | USB_PORT_STAT_C_RESET) << 16)
180
181/*
182 * This function is almostly the same as dummy_hcd.c:dummy_hub_status() without
183 * suspend/resume support. But, it is modified to provide multiple ports.
184 *
185 * @buf: a bitmap to show which port status has been changed.
186 * bit 0: reserved or used for another purpose?
187 * bit 1: the status of port 0 has been changed.
188 * bit 2: the status of port 1 has been changed.
189 * ...
190 * bit 7: the status of port 6 has been changed.
191 * bit 8: the status of port 7 has been changed.
192 * ...
193 * bit 15: the status of port 14 has been changed.
194 *
195 * So, the maximum number of ports is 31 ( port 0 to port 30) ?
196 *
25985edc 197 * The return value is the actual transferred length in byte. If nothing has
04679b34
TH		 198 * been changed, return 0. In the case that the number of ports is less than or
199 * equal to 6 (VHCI_NPORTS==7), return 1.
200 *
201 */
202static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
203{
204 struct vhci_hcd *vhci;
205 unsigned long flags;
206 int retval = 0;
207
208 /* the enough buffer is allocated according to USB_MAXCHILDREN */
209 unsigned long *event_bits = (unsigned long *) buf;
210 int rhport;
211 int changed = 0;
212
213
214 *event_bits = 0;
215
216 vhci = hcd_to_vhci(hcd);
217
218 spin_lock_irqsave(&vhci->lock, flags);
541c7d43 219 if (!HCD_HW_ACCESSIBLE(hcd)) {
b8868e45 220 usbip_dbg_vhci_rh("hw accessible flag in on?\n");
04679b34
TH		 221 goto done;
222 }
223
224 /* check pseudo status register for each port */
225 for (rhport = 0; rhport < VHCI_NPORTS; rhport++) {
226 if ((vhci->port_status[rhport] & PORT_C_MASK)) {
227 /* The status of a port has been changed, */
b8868e45 228 usbip_dbg_vhci_rh("port %d is changed\n", rhport);
04679b34
TH		 229
230 *event_bits |= 1 << (rhport + 1);
231 changed = 1;
232 }
233 }
234
b8868e45 235 usbip_uinfo("changed %d\n", changed);
04679b34
TH		 236
237 if (hcd->state == HC_STATE_SUSPENDED)
238 usb_hcd_resume_root_hub(hcd);
239
240 if (changed)
241 retval = 1 + (VHCI_NPORTS / 8);
242 else
243 retval = 0;
244
245done:
246 spin_unlock_irqrestore(&vhci->lock, flags);
247 return retval;
248}
249
250/* See hub_configure in hub.c */
251static inline void hub_descriptor(struct usb_hub_descriptor *desc)
252{
253 memset(desc, 0, sizeof(*desc));
254 desc->bDescriptorType = 0x29;
255 desc->bDescLength = 9;
256 desc->wHubCharacteristics = (__force __u16)
257 (__constant_cpu_to_le16(0x0001));
258 desc->bNbrPorts = VHCI_NPORTS;
dbe79bbe
JY		 259 desc->u.hs.DeviceRemovable[0] = 0xff;
260 desc->u.hs.DeviceRemovable[1] = 0xff;
04679b34
TH		 261}
262
263static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
264 u16 wIndex, char *buf, u16 wLength)
265{
266 struct vhci_hcd *dum;
267 int retval = 0;
268 unsigned long flags;
269 int rhport;
270
271 u32 prev_port_status[VHCI_NPORTS];
272
541c7d43 273 if (!HCD_HW_ACCESSIBLE(hcd))
04679b34
TH		 274 return -ETIMEDOUT;
275
276 /*
277 * NOTE:
278 * wIndex shows the port number and begins from 1.
279 */
b8868e45 280 usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue,
04679b34
TH		 281 wIndex);
282 if (wIndex > VHCI_NPORTS)
b8868e45
BM		 283 printk(KERN_ERR "%s: invalid port number %d\n", __func__,
284 wIndex);
04679b34
TH		 285 rhport = ((__u8)(wIndex & 0x00ff)) - 1;
286
287 dum = hcd_to_vhci(hcd);
288
289 spin_lock_irqsave(&dum->lock, flags);
290
291 /* store old status and compare now and old later */
b8868e45 292 if (usbip_dbg_flag_vhci_rh) {
04679b34
TH		 293 int i = 0;
294 for (i = 0; i < VHCI_NPORTS; i++)
295 prev_port_status[i] = dum->port_status[i];
296 }
297
298 switch (typeReq) {
299 case ClearHubFeature:
b8868e45 300 usbip_dbg_vhci_rh(" ClearHubFeature\n");
04679b34
TH		 301 break;
302 case ClearPortFeature:
303 switch (wValue) {
304 case USB_PORT_FEAT_SUSPEND:
305 if (dum->port_status[rhport] & USB_PORT_STAT_SUSPEND) {
306 /* 20msec signaling */
307 dum->resuming = 1;
308 dum->re_timeout =
309 jiffies + msecs_to_jiffies(20);
310 }
311 break;
312 case USB_PORT_FEAT_POWER:
b8868e45
BM		 313 usbip_dbg_vhci_rh(" ClearPortFeature: "
314 "USB_PORT_FEAT_POWER\n");
04679b34
TH		 315 dum->port_status[rhport] = 0;
316 /* dum->address = 0; */
317 /* dum->hdev = 0; */
318 dum->resuming = 0;
319 break;
320 case USB_PORT_FEAT_C_RESET:
b8868e45
BM		 321 usbip_dbg_vhci_rh(" ClearPortFeature: "
322 "USB_PORT_FEAT_C_RESET\n");
04679b34
TH		 323 switch (dum->vdev[rhport].speed) {
324 case USB_SPEED_HIGH:
325 dum->port_status[rhport] |=
326 USB_PORT_STAT_HIGH_SPEED;
327 break;
328 case USB_SPEED_LOW:
329 dum->port_status[rhport] |=
330 USB_PORT_STAT_LOW_SPEED;
331 break;
332 default:
333 break;
334 }
335 default:
b8868e45
BM		 336 usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n",
337 wValue);
04679b34
TH		 338 dum->port_status[rhport] &= ~(1 << wValue);
339 }
340 break;
341 case GetHubDescriptor:
b8868e45 342 usbip_dbg_vhci_rh(" GetHubDescriptor\n");
04679b34
TH		 343 hub_descriptor((struct usb_hub_descriptor *) buf);
344 break;
345 case GetHubStatus:
b8868e45 346 usbip_dbg_vhci_rh(" GetHubStatus\n");
04679b34
TH		 347 *(__le32 *) buf = __constant_cpu_to_le32(0);
348 break;
349 case GetPortStatus:
b8868e45 350 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex);
04679b34
TH		 351 if (wIndex > VHCI_NPORTS || wIndex < 1) {
352 printk(KERN_ERR "%s: invalid port number %d\n",
353 __func__, wIndex);
354 retval = -EPIPE;
355 }
356
357 /* we do no care of resume. */
358
359 /* whoever resets or resumes must GetPortStatus to
360 * complete it!!
361 * */
362 if (dum->resuming && time_after(jiffies, dum->re_timeout)) {
363 printk(KERN_ERR "%s: not yet\n", __func__);
364 dum->port_status[rhport] |=
365 (1 << USB_PORT_FEAT_C_SUSPEND);
366 dum->port_status[rhport] &=
367 ~(1 << USB_PORT_FEAT_SUSPEND);
368 dum->resuming = 0;
369 dum->re_timeout = 0;
370 /* if (dum->driver && dum->driver->resume) {
371 * spin_unlock (&dum->lock);
372 * dum->driver->resume (&dum->gadget);
373 * spin_lock (&dum->lock);
374 * } */
375 }
376
377 if ((dum->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) !=
378 0 && time_after(jiffies, dum->re_timeout)) {
379 dum->port_status[rhport] |=
380 (1 << USB_PORT_FEAT_C_RESET);
381 dum->port_status[rhport] &=
382 ~(1 << USB_PORT_FEAT_RESET);
383 dum->re_timeout = 0;
384
385 if (dum->vdev[rhport].ud.status ==
386 VDEV_ST_NOTASSIGNED) {
b8868e45
BM		 387 usbip_dbg_vhci_rh(" enable rhport %d "
388 "(status %u)\n",
04679b34
TH		 389 rhport,
390 dum->vdev[rhport].ud.status);
391 dum->port_status[rhport] |=
392 USB_PORT_STAT_ENABLE;
393 }
394#if 0
395 if (dum->driver) {
396
397 dum->port_status[rhport] |=
398 USB_PORT_STAT_ENABLE;
399 /* give it the best speed we agree on */
400 dum->gadget.speed = dum->driver->speed;
401 dum->gadget.ep0->maxpacket = 64;
402 switch (dum->gadget.speed) {
403 case USB_SPEED_HIGH:
404 dum->port_status[rhport] |=
405 USB_PORT_STAT_HIGH_SPEED;
406 break;
407 case USB_SPEED_LOW:
408 dum->gadget.ep0->maxpacket = 8;
409 dum->port_status[rhport] |=
410 USB_PORT_STAT_LOW_SPEED;
411 break;
412 default:
413 dum->gadget.speed = USB_SPEED_FULL;
414 break;
415 }
416 }
417#endif
418
419 }
420 ((u16 *) buf)[0] = cpu_to_le16(dum->port_status[rhport]);
421 ((u16 *) buf)[1] =
422 cpu_to_le16(dum->port_status[rhport] >> 16);
423
b8868e45 424 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0],
04679b34
TH		 425 ((u16 *)buf)[1]);
426 break;
427 case SetHubFeature:
b8868e45 428 usbip_dbg_vhci_rh(" SetHubFeature\n");
04679b34
TH		 429 retval = -EPIPE;
430 break;
431 case SetPortFeature:
432 switch (wValue) {
433 case USB_PORT_FEAT_SUSPEND:
b8868e45 434 usbip_dbg_vhci_rh(" SetPortFeature: "
04679b34
TH		 435 "USB_PORT_FEAT_SUSPEND\n");
436 printk(KERN_ERR "%s: not yet\n", __func__);
437#if 0
438 dum->port_status[rhport] |=
439 (1 << USB_PORT_FEAT_SUSPEND);
440 if (dum->driver->suspend) {
441 spin_unlock(&dum->lock);
442 dum->driver->suspend(&dum->gadget);
443 spin_lock(&dum->lock);
444 }
445#endif
446 break;
447 case USB_PORT_FEAT_RESET:
b8868e45
BM		 448 usbip_dbg_vhci_rh(" SetPortFeature: "
449 "USB_PORT_FEAT_RESET\n");
04679b34
TH		 450 /* if it's already running, disconnect first */
451 if (dum->port_status[rhport] & USB_PORT_STAT_ENABLE) {
452 dum->port_status[rhport] &=
453 ~(USB_PORT_STAT_ENABLE |
454 USB_PORT_STAT_LOW_SPEED |
455 USB_PORT_STAT_HIGH_SPEED);
456#if 0
457 if (dum->driver) {
458 dev_dbg(hardware, "disconnect\n");
459 stop_activity(dum, dum->driver);
460 }
461#endif
462
463 /* FIXME test that code path! */
464 }
465 /* 50msec reset signaling */
466 dum->re_timeout = jiffies + msecs_to_jiffies(50);
467
468 /* FALLTHROUGH */
469 default:
b8868e45
BM		 470 usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
471 wValue);
04679b34
TH		 472 dum->port_status[rhport] |= (1 << wValue);
473 }
474 break;
475
476 default:
477 printk(KERN_ERR "%s: default: no such request\n", __func__);
478 /* dev_dbg (hardware,
479 * "hub control req%04x v%04x i%04x l%d\n",
480 * typeReq, wValue, wIndex, wLength); */
481
482 /* "protocol stall" on error */
483 retval = -EPIPE;
484 }
485
b8868e45 486 if (usbip_dbg_flag_vhci_rh) {
04679b34
TH		 487 printk(KERN_DEBUG "port %d\n", rhport);
488 dump_port_status(prev_port_status[rhport]);
489 dump_port_status(dum->port_status[rhport]);
490 }
b8868e45 491 usbip_dbg_vhci_rh(" bye\n");
04679b34
TH		 492
493 spin_unlock_irqrestore(&dum->lock, flags);
494
495 return retval;
496}
497
498
499
500/*----------------------------------------------------------------------*/
501
502static struct vhci_device *get_vdev(struct usb_device *udev)
503{
504 int i;
505
506 if (!udev)
507 return NULL;
508
509 for (i = 0; i < VHCI_NPORTS; i++)
510 if (the_controller->vdev[i].udev == udev)
511 return port_to_vdev(i);
512
513 return NULL;
514}
515
516static void vhci_tx_urb(struct urb *urb)
517{
518 struct vhci_device *vdev = get_vdev(urb->dev);
519 struct vhci_priv *priv;
520 unsigned long flag;
521
522 if (!vdev) {
523 err("could not get virtual device");
524 /* BUG(); */
525 return;
526 }
527
b8868e45
BM		 528 priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
529
04679b34
TH		 530 spin_lock_irqsave(&vdev->priv_lock, flag);
531
04679b34
TH		 532 if (!priv) {
533 dev_err(&urb->dev->dev, "malloc vhci_priv\n");
534 spin_unlock_irqrestore(&vdev->priv_lock, flag);
535 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
536 return;
537 }
538
539 priv->seqnum = atomic_inc_return(&the_controller->seqnum);
540 if (priv->seqnum == 0xffff)
b8868e45 541 usbip_uinfo("seqnum max\n");
04679b34
TH		 542
543 priv->vdev = vdev;
544 priv->urb = urb;
545
546 urb->hcpriv = (void *) priv;
547
548
549 list_add_tail(&priv->list, &vdev->priv_tx);
550
551 wake_up(&vdev->waitq_tx);
552 spin_unlock_irqrestore(&vdev->priv_lock, flag);
553}
554
555static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
556 gfp_t mem_flags)
557{
558 struct device *dev = &urb->dev->dev;
559 int ret = 0;
560 unsigned long flags;
6d212153 561 struct vhci_device *vdev;
04679b34 562
b8868e45 563 usbip_dbg_vhci_hc("enter, usb_hcd %p urb %p mem_flags %d\n",
04679b34
TH		 564 hcd, urb, mem_flags);
565
566 /* patch to usb_sg_init() is in 2.5.60 */
567 BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length);
568
569 spin_lock_irqsave(&the_controller->lock, flags);
570
04679b34
TH		 571 if (urb->status != -EINPROGRESS) {
572 dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
573 spin_unlock_irqrestore(&the_controller->lock, flags);
574 return urb->status;
575 }
576
01446ef5 577 vdev = port_to_vdev(urb->dev->portnum-1);
6d212153
MV		 578
579 /* refuse enqueue for dead connection */
580 spin_lock(&vdev->ud.lock);
581 if (vdev->ud.status == VDEV_ST_NULL || vdev->ud.status == VDEV_ST_ERROR) {
582 usbip_uerr("enqueue for inactive port %d\n", vdev->rhport);
583 spin_unlock(&vdev->ud.lock);
584 spin_unlock_irqrestore(&the_controller->lock, flags);
585 return -ENODEV;
586 }
587 spin_unlock(&vdev->ud.lock);
588
04679b34
TH		 589 ret = usb_hcd_link_urb_to_ep(hcd, urb);
590 if (ret)
591 goto no_need_unlink;
592
593 /*
b8868e45 594 * The enumeration process is as follows;
04679b34
TH		 595 *
596 * 1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
597 * to get max packet length of default pipe
598 *
599 * 2. Set_Address request to DevAddr(0) EndPoint(0)
600 *
601 */
602
603 if (usb_pipedevice(urb->pipe) == 0) {
604 __u8 type = usb_pipetype(urb->pipe);
605 struct usb_ctrlrequest *ctrlreq =
606 (struct usb_ctrlrequest *) urb->setup_packet;
04679b34
TH		 607
608 if (type != PIPE_CONTROL || !ctrlreq) {
609 dev_err(dev, "invalid request to devnum 0\n");
a7cd5829 610 ret = -EINVAL;
04679b34
TH		 611 goto no_need_xmit;
612 }
613
614 switch (ctrlreq->bRequest) {
615 case USB_REQ_SET_ADDRESS:
616 /* set_address may come when a device is reset */
617 dev_info(dev, "SetAddress Request (%d) to port %d\n",
618 ctrlreq->wValue, vdev->rhport);
619
7606ee8a
MV		 620 if (vdev->udev)
621 usb_put_dev(vdev->udev);
622 vdev->udev = usb_get_dev(urb->dev);
04679b34
TH		 623
624 spin_lock(&vdev->ud.lock);
625 vdev->ud.status = VDEV_ST_USED;
626 spin_unlock(&vdev->ud.lock);
627
628 if (urb->status == -EINPROGRESS) {
629 /* This request is successfully completed. */
630 /* If not -EINPROGRESS, possibly unlinked. */
631 urb->status = 0;
632 }
633
634 goto no_need_xmit;
635
636 case USB_REQ_GET_DESCRIPTOR:
637 if (ctrlreq->wValue == (USB_DT_DEVICE << 8))
b8868e45 638 usbip_dbg_vhci_hc("Not yet?: "
04679b34
TH		 639 "Get_Descriptor to device 0 "
640 "(get max pipe size)\n");
641
7606ee8a
MV		 642 if (vdev->udev)
643 usb_put_dev(vdev->udev);
644 vdev->udev = usb_get_dev(urb->dev);
04679b34
TH		 645 goto out;
646
647 default:
648 /* NOT REACHED */
649 dev_err(dev, "invalid request to devnum 0 bRequest %u, "
650 "wValue %u\n", ctrlreq->bRequest,
651 ctrlreq->wValue);
652 ret = -EINVAL;
653 goto no_need_xmit;
654 }
655
656 }
657
658out:
659 vhci_tx_urb(urb);
660
661 spin_unlock_irqrestore(&the_controller->lock, flags);
662
663 return 0;
664
665no_need_xmit:
666 usb_hcd_unlink_urb_from_ep(hcd, urb);
667no_need_unlink:
668 spin_unlock_irqrestore(&the_controller->lock, flags);
669
670 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);
671
a7cd5829 672 return ret;
04679b34
TH		 673}
674
675/*
676 * vhci_rx gives back the urb after receiving the reply of the urb. If an
677 * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
678 * back its urb. For the driver unlinking the urb, the content of the urb is
679 * not important, but the calling to its completion handler is important; the
680 * completion of unlinking is notified by the completion handler.
681 *
682 *
683 * CLIENT SIDE
684 *
685 * - When vhci_hcd receives RET_SUBMIT,
686 *
687 * - case 1a). the urb of the pdu is not unlinking.
688 * - normal case
689 * => just give back the urb
690 *
691 * - case 1b). the urb of the pdu is unlinking.
692 * - usbip.ko will return a reply of the unlinking request.
693 * => give back the urb now and go to case 2b).
694 *
695 * - When vhci_hcd receives RET_UNLINK,
696 *
697 * - case 2a). a submit request is still pending in vhci_hcd.
698 * - urb was really pending in usbip.ko and urb_unlink_urb() was
699 * completed there.
700 * => free a pending submit request
701 * => notify unlink completeness by giving back the urb
702 *
703 * - case 2b). a submit request is *not* pending in vhci_hcd.
704 * - urb was already given back to the core driver.
705 * => do not give back the urb
706 *
707 *
708 * SERVER SIDE
709 *
710 * - When usbip receives CMD_UNLINK,
711 *
712 * - case 3a). the urb of the unlink request is now in submission.
713 * => do usb_unlink_urb().
714 * => after the unlink is completed, send RET_UNLINK.
715 *
716 * - case 3b). the urb of the unlink request is not in submission.
717 * - may be already completed or never be received
718 * => send RET_UNLINK
719 *
720 */
721static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
722{
723 unsigned long flags;
724 struct vhci_priv *priv;
725 struct vhci_device *vdev;
726
b8868e45 727 usbip_uinfo("vhci_hcd: dequeue a urb %p\n", urb);
04679b34
TH		 728
729
730 spin_lock_irqsave(&the_controller->lock, flags);
731
732 priv = urb->hcpriv;
733 if (!priv) {
734 /* URB was never linked! or will be soon given back by
735 * vhci_rx. */
736 spin_unlock_irqrestore(&the_controller->lock, flags);
737 return 0;
738 }
739
740 {
741 int ret = 0;
742 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
743 if (ret) {
744 spin_unlock_irqrestore(&the_controller->lock, flags);
b8868e45 745 return ret;
04679b34
TH		 746 }
747 }
748
749 /* send unlink request here? */
750 vdev = priv->vdev;
751
752 if (!vdev->ud.tcp_socket) {
753 /* tcp connection is closed */
754 unsigned long flags2;
755
756 spin_lock_irqsave(&vdev->priv_lock, flags2);
757
b8868e45
BM		 758 usbip_uinfo("vhci_hcd: device %p seems to be disconnected\n",
759 vdev);
04679b34
TH		 760 list_del(&priv->list);
761 kfree(priv);
762 urb->hcpriv = NULL;
763
764 spin_unlock_irqrestore(&vdev->priv_lock, flags2);
765
b8868e45
BM		 766 /*
767 * If tcp connection is alive, we have sent CMD_UNLINK.
768 * vhci_rx will receive RET_UNLINK and give back the URB.
769 * Otherwise, we give back it here.
770 */
771 usbip_uinfo("vhci_hcd: vhci_urb_dequeue() gives back urb %p\n",
772 urb);
773
774 usb_hcd_unlink_urb_from_ep(hcd, urb);
775
776 spin_unlock_irqrestore(&the_controller->lock, flags);
777 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb,
778 urb->status);
779 spin_lock_irqsave(&the_controller->lock, flags);
780
04679b34
TH		 781 } else {
782 /* tcp connection is alive */
783 unsigned long flags2;
784 struct vhci_unlink *unlink;
785
786 spin_lock_irqsave(&vdev->priv_lock, flags2);
787
788 /* setup CMD_UNLINK pdu */
789 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC);
790 if (!unlink) {
b8868e45 791 usbip_uerr("malloc vhci_unlink\n");
04679b34
TH		 792 spin_unlock_irqrestore(&vdev->priv_lock, flags2);
793 spin_unlock_irqrestore(&the_controller->lock, flags);
794 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
795 return -ENOMEM;
796 }
797
798 unlink->seqnum = atomic_inc_return(&the_controller->seqnum);
799 if (unlink->seqnum == 0xffff)
b8868e45 800 usbip_uinfo("seqnum max\n");
04679b34
TH		 801
802 unlink->unlink_seqnum = priv->seqnum;
803
b8868e45 804 usbip_uinfo("vhci_hcd: device %p seems to be still connected\n",
04679b34
TH		 805 vdev);
806
807 /* send cmd_unlink and try to cancel the pending URB in the
808 * peer */
809 list_add_tail(&unlink->list, &vdev->unlink_tx);
810 wake_up(&vdev->waitq_tx);
811
812 spin_unlock_irqrestore(&vdev->priv_lock, flags2);
813 }
814
04679b34
TH		 815 spin_unlock_irqrestore(&the_controller->lock, flags);
816
b8868e45 817 usbip_dbg_vhci_hc("leave\n");
04679b34
TH		 818 return 0;
819}
820
04679b34
TH		 821static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
822{
823 struct vhci_unlink *unlink, *tmp;
824
825 spin_lock(&vdev->priv_lock);
826
827 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
b92a5e23 828 usbip_uinfo("unlink cleanup tx %lu\n", unlink->unlink_seqnum);
04679b34
TH		 829 list_del(&unlink->list);
830 kfree(unlink);
831 }
832
833 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {
b92a5e23
MV		 834 struct urb *urb;
835
836 /* give back URB of unanswered unlink request */
837 usbip_uinfo("unlink cleanup rx %lu\n", unlink->unlink_seqnum);
838
839 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
840 if (!urb) {
841 usbip_uinfo("the urb (seqnum %lu) was already given back\n",
842 unlink->unlink_seqnum);
843 list_del(&unlink->list);
844 kfree(unlink);
845 continue;
846 }
847
848 urb->status = -ENODEV;
849
850 spin_lock(&the_controller->lock);
851 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
852 spin_unlock(&the_controller->lock);
853
854 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);
855
04679b34
TH		 856 list_del(&unlink->list);
857 kfree(unlink);
858 }
859
860 spin_unlock(&vdev->priv_lock);
861}
862
863/*
864 * The important thing is that only one context begins cleanup.
865 * This is why error handling and cleanup become simple.
866 * We do not want to consider race condition as possible.
867 */
868static void vhci_shutdown_connection(struct usbip_device *ud)
869{
870 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
871
872 /* need this? see stub_dev.c */
873 if (ud->tcp_socket) {
b8868e45 874 usbip_udbg("shutdown tcp_socket %p\n", ud->tcp_socket);
04679b34
TH		 875 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
876 }
877
9720b4bc 878 /* kill threads related to this sdev, if v.c. exists */
d1b2e95a
MV		 879 if (vdev->ud.tcp_rx)
880 kthread_stop(vdev->ud.tcp_rx);
881 if (vdev->ud.tcp_tx)
882 kthread_stop(vdev->ud.tcp_tx);
9720b4bc 883
b8868e45 884 usbip_uinfo("stop threads\n");
04679b34
TH		 885
886 /* active connection is closed */
887 if (vdev->ud.tcp_socket != NULL) {
888 sock_release(vdev->ud.tcp_socket);
889 vdev->ud.tcp_socket = NULL;
890 }
b8868e45 891 usbip_uinfo("release socket\n");
04679b34
TH		 892
893 vhci_device_unlink_cleanup(vdev);
894
895 /*
896 * rh_port_disconnect() is a trigger of ...
897 * usb_disable_device():
898 * disable all the endpoints for a USB device.
899 * usb_disable_endpoint():
900 * disable endpoints. pending urbs are unlinked(dequeued).
901 *
902 * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
903 * deteched device should release used urbs in a cleanup function(i.e.
904 * xxx_disconnect()). Therefore, vhci_hcd does not need to release
905 * pushed urbs and their private data in this function.
906 *
907 * NOTE: vhci_dequeue() must be considered carefully. When shutdowning
908 * a connection, vhci_shutdown_connection() expects vhci_dequeue()
909 * gives back pushed urbs and frees their private data by request of
910 * the cleanup function of a USB driver. When unlinking a urb with an
911 * active connection, vhci_dequeue() does not give back the urb which
912 * is actually given back by vhci_rx after receiving its return pdu.
913 *
914 */
915 rh_port_disconnect(vdev->rhport);
916
b8868e45 917 usbip_uinfo("disconnect device\n");
04679b34
TH		 918}
919
920
921static void vhci_device_reset(struct usbip_device *ud)
922{
923 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
924
925 spin_lock(&ud->lock);
926
927 vdev->speed = 0;
928 vdev->devid = 0;
929
7606ee8a
MV		 930 if (vdev->udev)
931 usb_put_dev(vdev->udev);
932 vdev->udev = NULL;
933
04679b34
TH		 934 ud->tcp_socket = NULL;
935
936 ud->status = VDEV_ST_NULL;
937
938 spin_unlock(&ud->lock);
939}
940
941static void vhci_device_unusable(struct usbip_device *ud)
942{
943 spin_lock(&ud->lock);
944
945 ud->status = VDEV_ST_ERROR;
946
947 spin_unlock(&ud->lock);
948}
949
950static void vhci_device_init(struct vhci_device *vdev)
951{
952 memset(vdev, 0, sizeof(*vdev));
953
04679b34
TH		 954 vdev->ud.side = USBIP_VHCI;
955 vdev->ud.status = VDEV_ST_NULL;
956 /* vdev->ud.lock = SPIN_LOCK_UNLOCKED; */
957 spin_lock_init(&vdev->ud.lock);
958
959 INIT_LIST_HEAD(&vdev->priv_rx);
960 INIT_LIST_HEAD(&vdev->priv_tx);
961 INIT_LIST_HEAD(&vdev->unlink_tx);
962 INIT_LIST_HEAD(&vdev->unlink_rx);
963 /* vdev->priv_lock = SPIN_LOCK_UNLOCKED; */
964 spin_lock_init(&vdev->priv_lock);
965
966 init_waitqueue_head(&vdev->waitq_tx);
967
968 vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
969 vdev->ud.eh_ops.reset = vhci_device_reset;
970 vdev->ud.eh_ops.unusable = vhci_device_unusable;
971
972 usbip_start_eh(&vdev->ud);
973}
974
975
976/*----------------------------------------------------------------------*/
977
978static int vhci_start(struct usb_hcd *hcd)
979{
980 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
981 int rhport;
982 int err = 0;
983
b8868e45 984 usbip_dbg_vhci_hc("enter vhci_start\n");
04679b34
TH		 985
986
987 /* initialize private data of usb_hcd */
988
989 for (rhport = 0; rhport < VHCI_NPORTS; rhport++) {
990 struct vhci_device *vdev = &vhci->vdev[rhport];
991 vhci_device_init(vdev);
992 vdev->rhport = rhport;
993 }
994
995 atomic_set(&vhci->seqnum, 0);
996 spin_lock_init(&vhci->lock);
997
998
999
1000 hcd->power_budget = 0; /* no limit */
1001 hcd->state = HC_STATE_RUNNING;
1002 hcd->uses_new_polling = 1;
1003
1004
1005 /* vhci_hcd is now ready to be controlled through sysfs */
1006 err = sysfs_create_group(&vhci_dev(vhci)->kobj, &dev_attr_group);
1007 if (err) {
b8868e45 1008 usbip_uerr("create sysfs files\n");
04679b34
TH		 1009 return err;
1010 }
1011
1012 return 0;
1013}
1014
1015static void vhci_stop(struct usb_hcd *hcd)
1016{
1017 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1018 int rhport = 0;
1019
b8868e45 1020 usbip_dbg_vhci_hc("stop VHCI controller\n");
04679b34
TH		 1021
1022
1023 /* 1. remove the userland interface of vhci_hcd */
1024 sysfs_remove_group(&vhci_dev(vhci)->kobj, &dev_attr_group);
1025
1026 /* 2. shutdown all the ports of vhci_hcd */
1027 for (rhport = 0 ; rhport < VHCI_NPORTS; rhport++) {
1028 struct vhci_device *vdev = &vhci->vdev[rhport];
1029
1030 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
1031 usbip_stop_eh(&vdev->ud);
1032 }
1033
1034
b8868e45 1035 usbip_uinfo("vhci_stop done\n");
04679b34
TH		 1036}
1037
1038/*----------------------------------------------------------------------*/
1039
1040static int vhci_get_frame_number(struct usb_hcd *hcd)
1041{
b8868e45 1042 usbip_uerr("Not yet implemented\n");
04679b34
TH		 1043 return 0;
1044}
1045
1046
1047#ifdef CONFIG_PM
1048
1049/* FIXME: suspend/resume */
1050static int vhci_bus_suspend(struct usb_hcd *hcd)
1051{
1052 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1053
1054 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1055
1056 spin_lock_irq(&vhci->lock);
1057 /* vhci->rh_state = DUMMY_RH_SUSPENDED;
1058 * set_link_state(vhci); */
1059 hcd->state = HC_STATE_SUSPENDED;
1060 spin_unlock_irq(&vhci->lock);
1061
1062 return 0;
1063}
1064
1065static int vhci_bus_resume(struct usb_hcd *hcd)
1066{
1067 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1068 int rc = 0;
1069
1070 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1071
1072 spin_lock_irq(&vhci->lock);
541c7d43 1073 if (!HCD_HW_ACCESSIBLE(hcd)) {
04679b34
TH		 1074 rc = -ESHUTDOWN;
1075 } else {
1076 /* vhci->rh_state = DUMMY_RH_RUNNING;
1077 * set_link_state(vhci);
1078 * if (!list_empty(&vhci->urbp_list))
1079 * mod_timer(&vhci->timer, jiffies); */
1080 hcd->state = HC_STATE_RUNNING;
1081 }
1082 spin_unlock_irq(&vhci->lock);
1083 return rc;
1084
1085 return 0;
1086}
1087
1088#else
1089
1090#define vhci_bus_suspend NULL
1091#define vhci_bus_resume NULL
1092#endif
1093
1094
1095
1096static struct hc_driver vhci_hc_driver = {
1097 .description = driver_name,
1098 .product_desc = driver_desc,
1099 .hcd_priv_size = sizeof(struct vhci_hcd),
1100
1101 .flags = HCD_USB2,
1102
1103 .start = vhci_start,
00512687 1104 .stop = vhci_stop,
04679b34
TH		 1105
1106 .urb_enqueue = vhci_urb_enqueue,
1107 .urb_dequeue = vhci_urb_dequeue,
1108
1109 .get_frame_number = vhci_get_frame_number,
1110
1111 .hub_status_data = vhci_hub_status,
1112 .hub_control = vhci_hub_control,
1113 .bus_suspend = vhci_bus_suspend,
1114 .bus_resume = vhci_bus_resume,
1115};
1116
1117static int vhci_hcd_probe(struct platform_device *pdev)
1118{
1119 struct usb_hcd *hcd;
1120 int ret;
1121
b8868e45 1122 usbip_uinfo("proving...\n");
04679b34 1123
b8868e45 1124 usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
04679b34
TH		 1125
1126 /* will be removed */
1127 if (pdev->dev.dma_mask) {
1128 dev_info(&pdev->dev, "vhci_hcd DMA not supported\n");
1129 return -EINVAL;
1130 }
1131
1132 /*
1133 * Allocate and initialize hcd.
1134 * Our private data is also allocated automatically.
1135 */
e9133972 1136 hcd = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
04679b34 1137 if (!hcd) {
b8868e45 1138 usbip_uerr("create hcd failed\n");
04679b34
TH		 1139 return -ENOMEM;
1140 }
cee6a262 1141 hcd->has_tt = 1;
04679b34
TH		 1142
1143 /* this is private data for vhci_hcd */
1144 the_controller = hcd_to_vhci(hcd);
1145
1146 /*
1147 * Finish generic HCD structure initialization and register.
1148 * Call the driver's reset() and start() routines.
1149 */
1150 ret = usb_add_hcd(hcd, 0, 0);
1151 if (ret != 0) {
b8868e45 1152 usbip_uerr("usb_add_hcd failed %d\n", ret);
04679b34
TH		 1153 usb_put_hcd(hcd);
1154 the_controller = NULL;
1155 return ret;
1156 }
1157
1158
b8868e45 1159 usbip_dbg_vhci_hc("bye\n");
04679b34
TH		 1160 return 0;
1161}
1162
1163
1164static int vhci_hcd_remove(struct platform_device *pdev)
1165{
1166 struct usb_hcd *hcd;
1167
1168 hcd = platform_get_drvdata(pdev);
1169 if (!hcd)
1170 return 0;
1171
1172 /*
1173 * Disconnects the root hub,
1174 * then reverses the effects of usb_add_hcd(),
1175 * invoking the HCD's stop() methods.
1176 */
1177 usb_remove_hcd(hcd);
1178 usb_put_hcd(hcd);
1179 the_controller = NULL;
1180
1181
1182 return 0;
1183}
1184
1185
1186
1187#ifdef CONFIG_PM
1188
1189/* what should happen for USB/IP under suspend/resume? */
1190static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1191{
1192 struct usb_hcd *hcd;
1193 int rhport = 0;
1194 int connected = 0;
1195 int ret = 0;
1196
1197 dev_dbg(&pdev->dev, "%s\n", __func__);
1198
1199 hcd = platform_get_drvdata(pdev);
1200
1201 spin_lock(&the_controller->lock);
1202
1203 for (rhport = 0; rhport < VHCI_NPORTS; rhport++)
1204 if (the_controller->port_status[rhport] &
1205 USB_PORT_STAT_CONNECTION)
1206 connected += 1;
1207
1208 spin_unlock(&the_controller->lock);
1209
1210 if (connected > 0) {
b8868e45 1211 usbip_uinfo("We have %d active connection%s. Do not suspend.\n",
04679b34
TH		 1212 connected, (connected == 1 ? "" : "s"));
1213 ret = -EBUSY;
1214 } else {
b8868e45 1215 usbip_uinfo("suspend vhci_hcd");
04679b34
TH		 1216 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1217 }
1218
1219 return ret;
1220}
1221
1222static int vhci_hcd_resume(struct platform_device *pdev)
1223{
1224 struct usb_hcd *hcd;
1225
1226 dev_dbg(&pdev->dev, "%s\n", __func__);
1227
1228 hcd = platform_get_drvdata(pdev);
1229 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1230 usb_hcd_poll_rh_status(hcd);
1231
1232 return 0;
1233}
1234
1235#else
1236
1237#define vhci_hcd_suspend NULL
1238#define vhci_hcd_resume NULL
1239
1240#endif
1241
1242
1243static struct platform_driver vhci_driver = {
1244 .probe = vhci_hcd_probe,
1245 .remove = __devexit_p(vhci_hcd_remove),
1246 .suspend = vhci_hcd_suspend,
1247 .resume = vhci_hcd_resume,
1248 .driver = {
1249 .name = (char *) driver_name,
1250 .owner = THIS_MODULE,
1251 },
1252};
1253
1254/*----------------------------------------------------------------------*/
1255
1256/*
1257 * The VHCI 'device' is 'virtual'; not a real plug&play hardware.
1258 * We need to add this virtual device as a platform device arbitrarily:
1259 * 1. platform_device_register()
1260 */
1261static void the_pdev_release(struct device *dev)
1262{
1263 return;
1264}
1265
1266static struct platform_device the_pdev = {
1267 /* should be the same name as driver_name */
1268 .name = (char *) driver_name,
1269 .id = -1,
1270 .dev = {
1271 /* .driver = &vhci_driver, */
1272 .release = the_pdev_release,
1273 },
1274};
1275
1276static int __init vhci_init(void)
1277{
1278 int ret;
1279
b8868e45 1280 usbip_dbg_vhci_hc("enter\n");
04679b34
TH		 1281 if (usb_disabled())
1282 return -ENODEV;
1283
1284 printk(KERN_INFO KBUILD_MODNAME ": %s, %s\n", driver_name,
1285 DRIVER_VERSION);
1286
1287 ret = platform_driver_register(&vhci_driver);
1288 if (ret < 0)
1289 goto err_driver_register;
1290
1291 ret = platform_device_register(&the_pdev);
1292 if (ret < 0)
1293 goto err_platform_device_register;
1294
b8868e45 1295 usbip_dbg_vhci_hc("bye\n");
04679b34
TH		 1296 return ret;
1297
1298 /* error occurred */
1299err_platform_device_register:
1300 platform_driver_unregister(&vhci_driver);
1301
1302err_driver_register:
b8868e45 1303 usbip_dbg_vhci_hc("bye\n");
04679b34
TH		 1304 return ret;
1305}
1306module_init(vhci_init);
1307
1308static void __exit vhci_cleanup(void)
1309{
b8868e45 1310 usbip_dbg_vhci_hc("enter\n");
04679b34
TH		 1311
1312 platform_device_unregister(&the_pdev);
1313 platform_driver_unregister(&vhci_driver);
1314
b8868e45 1315 usbip_dbg_vhci_hc("bye\n");
04679b34
TH		 1316}
1317module_exit(vhci_cleanup);
kernel source for telekom puls (alcatel/mediatek)