2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
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.
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.
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,
20 #include <linux/slab.h>
22 #include "usbip_common.h"
25 #define DRIVER_VERSION "1.0"
26 #define DRIVER_AUTHOR "Takahiro Hirofuchi"
27 #define DRIVER_DESC "Virtual Host Controller Interface Driver for USB/IP"
28 #define DRIVER_LICENCE "GPL"
29 MODULE_AUTHOR(DRIVER_AUTHOR
);
30 MODULE_DESCRIPTION(DRIVER_DESC
);
31 MODULE_LICENSE(DRIVER_LICENCE
);
37 * - update root hub emulation
38 * - move the emulation code to userland ?
39 * porting to other operating systems
40 * minimize kernel code
41 * - add suspend/resume code
42 * - clean up everything
46 /* See usb gadget dummy hcd */
49 static int vhci_hub_status(struct usb_hcd
*hcd
, char *buff
);
50 static int vhci_hub_control(struct usb_hcd
*hcd
, u16 typeReq
, u16 wValue
,
51 u16 wIndex
, char *buff
, u16 wLength
);
52 static int vhci_urb_enqueue(struct usb_hcd
*hcd
, struct urb
*urb
,
54 static int vhci_urb_dequeue(struct usb_hcd
*hcd
, struct urb
*urb
, int status
);
55 static int vhci_start(struct usb_hcd
*vhci_hcd
);
56 static void vhci_stop(struct usb_hcd
*hcd
);
57 static int vhci_get_frame_number(struct usb_hcd
*hcd
);
59 static const char driver_name
[] = "vhci_hcd";
60 static const char driver_desc
[] = "USB/IP Virtual Host Controller";
62 struct vhci_hcd
*the_controller
;
64 static const char *bit_desc
[] = {
81 "C_CONNECTION", /*16*/
84 "C_OVER_CURRENT", /*19*/
100 static void dump_port_status(u32 status
)
104 printk(KERN_DEBUG
"status %08x:", status
);
105 for (i
= 0; i
< 32; i
++) {
106 if (status
& (1 << i
))
107 printk(" %s", bit_desc
[i
]);
115 void rh_port_connect(int rhport
, enum usb_device_speed speed
)
119 usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport
);
121 spin_lock_irqsave(&the_controller
->lock
, flags
);
123 the_controller
->port_status
[rhport
] |= USB_PORT_STAT_CONNECTION
124 | (1 << USB_PORT_FEAT_C_CONNECTION
);
128 the_controller
->port_status
[rhport
] |= USB_PORT_STAT_HIGH_SPEED
;
131 the_controller
->port_status
[rhport
] |= USB_PORT_STAT_LOW_SPEED
;
137 /* spin_lock(&the_controller->vdev[rhport].ud.lock);
138 * the_controller->vdev[rhport].ud.status = VDEV_CONNECT;
139 * spin_unlock(&the_controller->vdev[rhport].ud.lock); */
141 the_controller
->pending_port
= rhport
;
143 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
145 usb_hcd_poll_rh_status(vhci_to_hcd(the_controller
));
148 void rh_port_disconnect(int rhport
)
152 usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport
);
154 spin_lock_irqsave(&the_controller
->lock
, flags
);
155 /* stop_activity(dum, driver); */
156 the_controller
->port_status
[rhport
] &= ~USB_PORT_STAT_CONNECTION
;
157 the_controller
->port_status
[rhport
] |=
158 (1 << USB_PORT_FEAT_C_CONNECTION
);
161 /* not yet complete the disconnection
162 * spin_lock(&vdev->ud.lock);
163 * vdev->ud.status = VHC_ST_DISCONNECT;
164 * spin_unlock(&vdev->ud.lock); */
166 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
168 usb_hcd_poll_rh_status(vhci_to_hcd(the_controller
));
173 /*----------------------------------------------------------------------*/
175 #define PORT_C_MASK \
176 ((USB_PORT_STAT_C_CONNECTION \
177 | USB_PORT_STAT_C_ENABLE \
178 | USB_PORT_STAT_C_SUSPEND \
179 | USB_PORT_STAT_C_OVERCURRENT \
180 | USB_PORT_STAT_C_RESET) << 16)
183 * This function is almostly the same as dummy_hcd.c:dummy_hub_status() without
184 * suspend/resume support. But, it is modified to provide multiple ports.
186 * @buf: a bitmap to show which port status has been changed.
187 * bit 0: reserved or used for another purpose?
188 * bit 1: the status of port 0 has been changed.
189 * bit 2: the status of port 1 has been changed.
191 * bit 7: the status of port 6 has been changed.
192 * bit 8: the status of port 7 has been changed.
194 * bit 15: the status of port 14 has been changed.
196 * So, the maximum number of ports is 31 ( port 0 to port 30) ?
198 * The return value is the actual transfered length in byte. If nothing has
199 * been changed, return 0. In the case that the number of ports is less than or
200 * equal to 6 (VHCI_NPORTS==7), return 1.
203 static int vhci_hub_status(struct usb_hcd
*hcd
, char *buf
)
205 struct vhci_hcd
*vhci
;
209 /* the enough buffer is allocated according to USB_MAXCHILDREN */
210 unsigned long *event_bits
= (unsigned long *) buf
;
217 vhci
= hcd_to_vhci(hcd
);
219 spin_lock_irqsave(&vhci
->lock
, flags
);
220 if (!HCD_HW_ACCESSIBLE(hcd
)) {
221 usbip_dbg_vhci_rh("hw accessible flag in on?\n");
225 /* check pseudo status register for each port */
226 for (rhport
= 0; rhport
< VHCI_NPORTS
; rhport
++) {
227 if ((vhci
->port_status
[rhport
] & PORT_C_MASK
)) {
228 /* The status of a port has been changed, */
229 usbip_dbg_vhci_rh("port %d is changed\n", rhport
);
231 *event_bits
|= 1 << (rhport
+ 1);
236 usbip_uinfo("changed %d\n", changed
);
238 if (hcd
->state
== HC_STATE_SUSPENDED
)
239 usb_hcd_resume_root_hub(hcd
);
242 retval
= 1 + (VHCI_NPORTS
/ 8);
247 spin_unlock_irqrestore(&vhci
->lock
, flags
);
251 /* See hub_configure in hub.c */
252 static inline void hub_descriptor(struct usb_hub_descriptor
*desc
)
254 memset(desc
, 0, sizeof(*desc
));
255 desc
->bDescriptorType
= 0x29;
256 desc
->bDescLength
= 9;
257 desc
->wHubCharacteristics
= (__force __u16
)
258 (__constant_cpu_to_le16(0x0001));
259 desc
->bNbrPorts
= VHCI_NPORTS
;
260 desc
->bitmap
[0] = 0xff;
261 desc
->bitmap
[1] = 0xff;
264 static int vhci_hub_control(struct usb_hcd
*hcd
, u16 typeReq
, u16 wValue
,
265 u16 wIndex
, char *buf
, u16 wLength
)
267 struct vhci_hcd
*dum
;
272 u32 prev_port_status
[VHCI_NPORTS
];
274 if (!HCD_HW_ACCESSIBLE(hcd
))
279 * wIndex shows the port number and begins from 1.
281 usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq
, wValue
,
283 if (wIndex
> VHCI_NPORTS
)
284 printk(KERN_ERR
"%s: invalid port number %d\n", __func__
,
286 rhport
= ((__u8
)(wIndex
& 0x00ff)) - 1;
288 dum
= hcd_to_vhci(hcd
);
290 spin_lock_irqsave(&dum
->lock
, flags
);
292 /* store old status and compare now and old later */
293 if (usbip_dbg_flag_vhci_rh
) {
295 for (i
= 0; i
< VHCI_NPORTS
; i
++)
296 prev_port_status
[i
] = dum
->port_status
[i
];
300 case ClearHubFeature
:
301 usbip_dbg_vhci_rh(" ClearHubFeature\n");
303 case ClearPortFeature
:
305 case USB_PORT_FEAT_SUSPEND
:
306 if (dum
->port_status
[rhport
] & USB_PORT_STAT_SUSPEND
) {
307 /* 20msec signaling */
310 jiffies
+ msecs_to_jiffies(20);
313 case USB_PORT_FEAT_POWER
:
314 usbip_dbg_vhci_rh(" ClearPortFeature: "
315 "USB_PORT_FEAT_POWER\n");
316 dum
->port_status
[rhport
] = 0;
317 /* dum->address = 0; */
321 case USB_PORT_FEAT_C_RESET
:
322 usbip_dbg_vhci_rh(" ClearPortFeature: "
323 "USB_PORT_FEAT_C_RESET\n");
324 switch (dum
->vdev
[rhport
].speed
) {
326 dum
->port_status
[rhport
] |=
327 USB_PORT_STAT_HIGH_SPEED
;
330 dum
->port_status
[rhport
] |=
331 USB_PORT_STAT_LOW_SPEED
;
337 usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n",
339 dum
->port_status
[rhport
] &= ~(1 << wValue
);
342 case GetHubDescriptor
:
343 usbip_dbg_vhci_rh(" GetHubDescriptor\n");
344 hub_descriptor((struct usb_hub_descriptor
*) buf
);
347 usbip_dbg_vhci_rh(" GetHubStatus\n");
348 *(__le32
*) buf
= __constant_cpu_to_le32(0);
351 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex
);
352 if (wIndex
> VHCI_NPORTS
|| wIndex
< 1) {
353 printk(KERN_ERR
"%s: invalid port number %d\n",
358 /* we do no care of resume. */
360 /* whoever resets or resumes must GetPortStatus to
363 if (dum
->resuming
&& time_after(jiffies
, dum
->re_timeout
)) {
364 printk(KERN_ERR
"%s: not yet\n", __func__
);
365 dum
->port_status
[rhport
] |=
366 (1 << USB_PORT_FEAT_C_SUSPEND
);
367 dum
->port_status
[rhport
] &=
368 ~(1 << USB_PORT_FEAT_SUSPEND
);
371 /* if (dum->driver && dum->driver->resume) {
372 * spin_unlock (&dum->lock);
373 * dum->driver->resume (&dum->gadget);
374 * spin_lock (&dum->lock);
378 if ((dum
->port_status
[rhport
] & (1 << USB_PORT_FEAT_RESET
)) !=
379 0 && time_after(jiffies
, dum
->re_timeout
)) {
380 dum
->port_status
[rhport
] |=
381 (1 << USB_PORT_FEAT_C_RESET
);
382 dum
->port_status
[rhport
] &=
383 ~(1 << USB_PORT_FEAT_RESET
);
386 if (dum
->vdev
[rhport
].ud
.status
==
387 VDEV_ST_NOTASSIGNED
) {
388 usbip_dbg_vhci_rh(" enable rhport %d "
391 dum
->vdev
[rhport
].ud
.status
);
392 dum
->port_status
[rhport
] |=
393 USB_PORT_STAT_ENABLE
;
398 dum
->port_status
[rhport
] |=
399 USB_PORT_STAT_ENABLE
;
400 /* give it the best speed we agree on */
401 dum
->gadget
.speed
= dum
->driver
->speed
;
402 dum
->gadget
.ep0
->maxpacket
= 64;
403 switch (dum
->gadget
.speed
) {
405 dum
->port_status
[rhport
] |=
406 USB_PORT_STAT_HIGH_SPEED
;
409 dum
->gadget
.ep0
->maxpacket
= 8;
410 dum
->port_status
[rhport
] |=
411 USB_PORT_STAT_LOW_SPEED
;
414 dum
->gadget
.speed
= USB_SPEED_FULL
;
421 ((u16
*) buf
)[0] = cpu_to_le16(dum
->port_status
[rhport
]);
423 cpu_to_le16(dum
->port_status
[rhport
] >> 16);
425 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16
*)buf
)[0],
429 usbip_dbg_vhci_rh(" SetHubFeature\n");
434 case USB_PORT_FEAT_SUSPEND
:
435 usbip_dbg_vhci_rh(" SetPortFeature: "
436 "USB_PORT_FEAT_SUSPEND\n");
437 printk(KERN_ERR
"%s: not yet\n", __func__
);
439 dum
->port_status
[rhport
] |=
440 (1 << USB_PORT_FEAT_SUSPEND
);
441 if (dum
->driver
->suspend
) {
442 spin_unlock(&dum
->lock
);
443 dum
->driver
->suspend(&dum
->gadget
);
444 spin_lock(&dum
->lock
);
448 case USB_PORT_FEAT_RESET
:
449 usbip_dbg_vhci_rh(" SetPortFeature: "
450 "USB_PORT_FEAT_RESET\n");
451 /* if it's already running, disconnect first */
452 if (dum
->port_status
[rhport
] & USB_PORT_STAT_ENABLE
) {
453 dum
->port_status
[rhport
] &=
454 ~(USB_PORT_STAT_ENABLE
|
455 USB_PORT_STAT_LOW_SPEED
|
456 USB_PORT_STAT_HIGH_SPEED
);
459 dev_dbg(hardware
, "disconnect\n");
460 stop_activity(dum
, dum
->driver
);
464 /* FIXME test that code path! */
466 /* 50msec reset signaling */
467 dum
->re_timeout
= jiffies
+ msecs_to_jiffies(50);
471 usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
473 dum
->port_status
[rhport
] |= (1 << wValue
);
478 printk(KERN_ERR
"%s: default: no such request\n", __func__
);
479 /* dev_dbg (hardware,
480 * "hub control req%04x v%04x i%04x l%d\n",
481 * typeReq, wValue, wIndex, wLength); */
483 /* "protocol stall" on error */
487 if (usbip_dbg_flag_vhci_rh
) {
488 printk(KERN_DEBUG
"port %d\n", rhport
);
489 dump_port_status(prev_port_status
[rhport
]);
490 dump_port_status(dum
->port_status
[rhport
]);
492 usbip_dbg_vhci_rh(" bye\n");
494 spin_unlock_irqrestore(&dum
->lock
, flags
);
501 /*----------------------------------------------------------------------*/
503 static struct vhci_device
*get_vdev(struct usb_device
*udev
)
510 for (i
= 0; i
< VHCI_NPORTS
; i
++)
511 if (the_controller
->vdev
[i
].udev
== udev
)
512 return port_to_vdev(i
);
517 static void vhci_tx_urb(struct urb
*urb
)
519 struct vhci_device
*vdev
= get_vdev(urb
->dev
);
520 struct vhci_priv
*priv
;
524 err("could not get virtual device");
529 priv
= kzalloc(sizeof(struct vhci_priv
), GFP_ATOMIC
);
531 spin_lock_irqsave(&vdev
->priv_lock
, flag
);
534 dev_err(&urb
->dev
->dev
, "malloc vhci_priv\n");
535 spin_unlock_irqrestore(&vdev
->priv_lock
, flag
);
536 usbip_event_add(&vdev
->ud
, VDEV_EVENT_ERROR_MALLOC
);
540 priv
->seqnum
= atomic_inc_return(&the_controller
->seqnum
);
541 if (priv
->seqnum
== 0xffff)
542 usbip_uinfo("seqnum max\n");
547 urb
->hcpriv
= (void *) priv
;
550 list_add_tail(&priv
->list
, &vdev
->priv_tx
);
552 wake_up(&vdev
->waitq_tx
);
553 spin_unlock_irqrestore(&vdev
->priv_lock
, flag
);
556 static int vhci_urb_enqueue(struct usb_hcd
*hcd
, struct urb
*urb
,
559 struct device
*dev
= &urb
->dev
->dev
;
563 usbip_dbg_vhci_hc("enter, usb_hcd %p urb %p mem_flags %d\n",
564 hcd
, urb
, mem_flags
);
566 /* patch to usb_sg_init() is in 2.5.60 */
567 BUG_ON(!urb
->transfer_buffer
&& urb
->transfer_buffer_length
);
569 spin_lock_irqsave(&the_controller
->lock
, flags
);
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
);
577 ret
= usb_hcd_link_urb_to_ep(hcd
, urb
);
582 * The enumeration process is as follows;
584 * 1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
585 * to get max packet length of default pipe
587 * 2. Set_Address request to DevAddr(0) EndPoint(0)
591 if (usb_pipedevice(urb
->pipe
) == 0) {
592 __u8 type
= usb_pipetype(urb
->pipe
);
593 struct usb_ctrlrequest
*ctrlreq
=
594 (struct usb_ctrlrequest
*) urb
->setup_packet
;
595 struct vhci_device
*vdev
=
596 port_to_vdev(the_controller
->pending_port
);
598 if (type
!= PIPE_CONTROL
|| !ctrlreq
) {
599 dev_err(dev
, "invalid request to devnum 0\n");
604 switch (ctrlreq
->bRequest
) {
605 case USB_REQ_SET_ADDRESS
:
606 /* set_address may come when a device is reset */
607 dev_info(dev
, "SetAddress Request (%d) to port %d\n",
608 ctrlreq
->wValue
, vdev
->rhport
);
610 vdev
->udev
= urb
->dev
;
612 spin_lock(&vdev
->ud
.lock
);
613 vdev
->ud
.status
= VDEV_ST_USED
;
614 spin_unlock(&vdev
->ud
.lock
);
616 if (urb
->status
== -EINPROGRESS
) {
617 /* This request is successfully completed. */
618 /* If not -EINPROGRESS, possibly unlinked. */
624 case USB_REQ_GET_DESCRIPTOR
:
625 if (ctrlreq
->wValue
== (USB_DT_DEVICE
<< 8))
626 usbip_dbg_vhci_hc("Not yet?: "
627 "Get_Descriptor to device 0 "
628 "(get max pipe size)\n");
630 /* FIXME: reference count? (usb_get_dev()) */
631 vdev
->udev
= urb
->dev
;
636 dev_err(dev
, "invalid request to devnum 0 bRequest %u, "
637 "wValue %u\n", ctrlreq
->bRequest
,
648 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
653 usb_hcd_unlink_urb_from_ep(hcd
, urb
);
655 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
657 usb_hcd_giveback_urb(vhci_to_hcd(the_controller
), urb
, urb
->status
);
663 * vhci_rx gives back the urb after receiving the reply of the urb. If an
664 * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
665 * back its urb. For the driver unlinking the urb, the content of the urb is
666 * not important, but the calling to its completion handler is important; the
667 * completion of unlinking is notified by the completion handler.
672 * - When vhci_hcd receives RET_SUBMIT,
674 * - case 1a). the urb of the pdu is not unlinking.
676 * => just give back the urb
678 * - case 1b). the urb of the pdu is unlinking.
679 * - usbip.ko will return a reply of the unlinking request.
680 * => give back the urb now and go to case 2b).
682 * - When vhci_hcd receives RET_UNLINK,
684 * - case 2a). a submit request is still pending in vhci_hcd.
685 * - urb was really pending in usbip.ko and urb_unlink_urb() was
687 * => free a pending submit request
688 * => notify unlink completeness by giving back the urb
690 * - case 2b). a submit request is *not* pending in vhci_hcd.
691 * - urb was already given back to the core driver.
692 * => do not give back the urb
697 * - When usbip receives CMD_UNLINK,
699 * - case 3a). the urb of the unlink request is now in submission.
700 * => do usb_unlink_urb().
701 * => after the unlink is completed, send RET_UNLINK.
703 * - case 3b). the urb of the unlink request is not in submission.
704 * - may be already completed or never be received
708 static int vhci_urb_dequeue(struct usb_hcd
*hcd
, struct urb
*urb
, int status
)
711 struct vhci_priv
*priv
;
712 struct vhci_device
*vdev
;
714 usbip_uinfo("vhci_hcd: dequeue a urb %p\n", urb
);
717 spin_lock_irqsave(&the_controller
->lock
, flags
);
721 /* URB was never linked! or will be soon given back by
723 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
729 ret
= usb_hcd_check_unlink_urb(hcd
, urb
, status
);
731 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
736 /* send unlink request here? */
739 if (!vdev
->ud
.tcp_socket
) {
740 /* tcp connection is closed */
741 unsigned long flags2
;
743 spin_lock_irqsave(&vdev
->priv_lock
, flags2
);
745 usbip_uinfo("vhci_hcd: device %p seems to be disconnected\n",
747 list_del(&priv
->list
);
751 spin_unlock_irqrestore(&vdev
->priv_lock
, flags2
);
754 * If tcp connection is alive, we have sent CMD_UNLINK.
755 * vhci_rx will receive RET_UNLINK and give back the URB.
756 * Otherwise, we give back it here.
758 usbip_uinfo("vhci_hcd: vhci_urb_dequeue() gives back urb %p\n",
761 usb_hcd_unlink_urb_from_ep(hcd
, urb
);
763 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
764 usb_hcd_giveback_urb(vhci_to_hcd(the_controller
), urb
,
766 spin_lock_irqsave(&the_controller
->lock
, flags
);
769 /* tcp connection is alive */
770 unsigned long flags2
;
771 struct vhci_unlink
*unlink
;
773 spin_lock_irqsave(&vdev
->priv_lock
, flags2
);
775 /* setup CMD_UNLINK pdu */
776 unlink
= kzalloc(sizeof(struct vhci_unlink
), GFP_ATOMIC
);
778 usbip_uerr("malloc vhci_unlink\n");
779 spin_unlock_irqrestore(&vdev
->priv_lock
, flags2
);
780 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
781 usbip_event_add(&vdev
->ud
, VDEV_EVENT_ERROR_MALLOC
);
785 unlink
->seqnum
= atomic_inc_return(&the_controller
->seqnum
);
786 if (unlink
->seqnum
== 0xffff)
787 usbip_uinfo("seqnum max\n");
789 unlink
->unlink_seqnum
= priv
->seqnum
;
791 usbip_uinfo("vhci_hcd: device %p seems to be still connected\n",
794 /* send cmd_unlink and try to cancel the pending URB in the
796 list_add_tail(&unlink
->list
, &vdev
->unlink_tx
);
797 wake_up(&vdev
->waitq_tx
);
799 spin_unlock_irqrestore(&vdev
->priv_lock
, flags2
);
803 if (!vdev
->ud
.tcp_socket
) {
804 /* tcp connection is closed */
805 usbip_uinfo("vhci_hcd: vhci_urb_dequeue() gives back urb %p\n",
808 usb_hcd_unlink_urb_from_ep(hcd
, urb
);
810 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
811 usb_hcd_giveback_urb(vhci_to_hcd(the_controller
), urb
,
813 spin_lock_irqsave(&the_controller
->lock
, flags
);
816 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
818 usbip_dbg_vhci_hc("leave\n");
823 static void vhci_device_unlink_cleanup(struct vhci_device
*vdev
)
825 struct vhci_unlink
*unlink
, *tmp
;
827 spin_lock(&vdev
->priv_lock
);
829 list_for_each_entry_safe(unlink
, tmp
, &vdev
->unlink_tx
, list
) {
830 list_del(&unlink
->list
);
834 list_for_each_entry_safe(unlink
, tmp
, &vdev
->unlink_rx
, list
) {
835 list_del(&unlink
->list
);
839 spin_unlock(&vdev
->priv_lock
);
843 * The important thing is that only one context begins cleanup.
844 * This is why error handling and cleanup become simple.
845 * We do not want to consider race condition as possible.
847 static void vhci_shutdown_connection(struct usbip_device
*ud
)
849 struct vhci_device
*vdev
= container_of(ud
, struct vhci_device
, ud
);
851 /* need this? see stub_dev.c */
852 if (ud
->tcp_socket
) {
853 usbip_udbg("shutdown tcp_socket %p\n", ud
->tcp_socket
);
854 kernel_sock_shutdown(ud
->tcp_socket
, SHUT_RDWR
);
857 usbip_stop_threads(&vdev
->ud
);
858 usbip_uinfo("stop threads\n");
860 /* active connection is closed */
861 if (vdev
->ud
.tcp_socket
!= NULL
) {
862 sock_release(vdev
->ud
.tcp_socket
);
863 vdev
->ud
.tcp_socket
= NULL
;
865 usbip_uinfo("release socket\n");
867 vhci_device_unlink_cleanup(vdev
);
870 * rh_port_disconnect() is a trigger of ...
871 * usb_disable_device():
872 * disable all the endpoints for a USB device.
873 * usb_disable_endpoint():
874 * disable endpoints. pending urbs are unlinked(dequeued).
876 * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
877 * deteched device should release used urbs in a cleanup function(i.e.
878 * xxx_disconnect()). Therefore, vhci_hcd does not need to release
879 * pushed urbs and their private data in this function.
881 * NOTE: vhci_dequeue() must be considered carefully. When shutdowning
882 * a connection, vhci_shutdown_connection() expects vhci_dequeue()
883 * gives back pushed urbs and frees their private data by request of
884 * the cleanup function of a USB driver. When unlinking a urb with an
885 * active connection, vhci_dequeue() does not give back the urb which
886 * is actually given back by vhci_rx after receiving its return pdu.
889 rh_port_disconnect(vdev
->rhport
);
891 usbip_uinfo("disconnect device\n");
895 static void vhci_device_reset(struct usbip_device
*ud
)
897 struct vhci_device
*vdev
= container_of(ud
, struct vhci_device
, ud
);
899 spin_lock(&ud
->lock
);
904 ud
->tcp_socket
= NULL
;
906 ud
->status
= VDEV_ST_NULL
;
908 spin_unlock(&ud
->lock
);
911 static void vhci_device_unusable(struct usbip_device
*ud
)
913 spin_lock(&ud
->lock
);
915 ud
->status
= VDEV_ST_ERROR
;
917 spin_unlock(&ud
->lock
);
920 static void vhci_device_init(struct vhci_device
*vdev
)
922 memset(vdev
, 0, sizeof(*vdev
));
924 usbip_task_init(&vdev
->ud
.tcp_rx
, "vhci_rx", vhci_rx_loop
);
925 usbip_task_init(&vdev
->ud
.tcp_tx
, "vhci_tx", vhci_tx_loop
);
927 vdev
->ud
.side
= USBIP_VHCI
;
928 vdev
->ud
.status
= VDEV_ST_NULL
;
929 /* vdev->ud.lock = SPIN_LOCK_UNLOCKED; */
930 spin_lock_init(&vdev
->ud
.lock
);
932 INIT_LIST_HEAD(&vdev
->priv_rx
);
933 INIT_LIST_HEAD(&vdev
->priv_tx
);
934 INIT_LIST_HEAD(&vdev
->unlink_tx
);
935 INIT_LIST_HEAD(&vdev
->unlink_rx
);
936 /* vdev->priv_lock = SPIN_LOCK_UNLOCKED; */
937 spin_lock_init(&vdev
->priv_lock
);
939 init_waitqueue_head(&vdev
->waitq_tx
);
941 vdev
->ud
.eh_ops
.shutdown
= vhci_shutdown_connection
;
942 vdev
->ud
.eh_ops
.reset
= vhci_device_reset
;
943 vdev
->ud
.eh_ops
.unusable
= vhci_device_unusable
;
945 usbip_start_eh(&vdev
->ud
);
949 /*----------------------------------------------------------------------*/
951 static int vhci_start(struct usb_hcd
*hcd
)
953 struct vhci_hcd
*vhci
= hcd_to_vhci(hcd
);
957 usbip_dbg_vhci_hc("enter vhci_start\n");
960 /* initialize private data of usb_hcd */
962 for (rhport
= 0; rhport
< VHCI_NPORTS
; rhport
++) {
963 struct vhci_device
*vdev
= &vhci
->vdev
[rhport
];
964 vhci_device_init(vdev
);
965 vdev
->rhport
= rhport
;
968 atomic_set(&vhci
->seqnum
, 0);
969 spin_lock_init(&vhci
->lock
);
973 hcd
->power_budget
= 0; /* no limit */
974 hcd
->state
= HC_STATE_RUNNING
;
975 hcd
->uses_new_polling
= 1;
978 /* vhci_hcd is now ready to be controlled through sysfs */
979 err
= sysfs_create_group(&vhci_dev(vhci
)->kobj
, &dev_attr_group
);
981 usbip_uerr("create sysfs files\n");
988 static void vhci_stop(struct usb_hcd
*hcd
)
990 struct vhci_hcd
*vhci
= hcd_to_vhci(hcd
);
993 usbip_dbg_vhci_hc("stop VHCI controller\n");
996 /* 1. remove the userland interface of vhci_hcd */
997 sysfs_remove_group(&vhci_dev(vhci
)->kobj
, &dev_attr_group
);
999 /* 2. shutdown all the ports of vhci_hcd */
1000 for (rhport
= 0 ; rhport
< VHCI_NPORTS
; rhport
++) {
1001 struct vhci_device
*vdev
= &vhci
->vdev
[rhport
];
1003 usbip_event_add(&vdev
->ud
, VDEV_EVENT_REMOVED
);
1004 usbip_stop_eh(&vdev
->ud
);
1008 usbip_uinfo("vhci_stop done\n");
1011 /*----------------------------------------------------------------------*/
1013 static int vhci_get_frame_number(struct usb_hcd
*hcd
)
1015 usbip_uerr("Not yet implemented\n");
1022 /* FIXME: suspend/resume */
1023 static int vhci_bus_suspend(struct usb_hcd
*hcd
)
1025 struct vhci_hcd
*vhci
= hcd_to_vhci(hcd
);
1027 dev_dbg(&hcd
->self
.root_hub
->dev
, "%s\n", __func__
);
1029 spin_lock_irq(&vhci
->lock
);
1030 /* vhci->rh_state = DUMMY_RH_SUSPENDED;
1031 * set_link_state(vhci); */
1032 hcd
->state
= HC_STATE_SUSPENDED
;
1033 spin_unlock_irq(&vhci
->lock
);
1038 static int vhci_bus_resume(struct usb_hcd
*hcd
)
1040 struct vhci_hcd
*vhci
= hcd_to_vhci(hcd
);
1043 dev_dbg(&hcd
->self
.root_hub
->dev
, "%s\n", __func__
);
1045 spin_lock_irq(&vhci
->lock
);
1046 if (!HCD_HW_ACCESSIBLE(hcd
)) {
1049 /* vhci->rh_state = DUMMY_RH_RUNNING;
1050 * set_link_state(vhci);
1051 * if (!list_empty(&vhci->urbp_list))
1052 * mod_timer(&vhci->timer, jiffies); */
1053 hcd
->state
= HC_STATE_RUNNING
;
1055 spin_unlock_irq(&vhci
->lock
);
1063 #define vhci_bus_suspend NULL
1064 #define vhci_bus_resume NULL
1069 static struct hc_driver vhci_hc_driver
= {
1070 .description
= driver_name
,
1071 .product_desc
= driver_desc
,
1072 .hcd_priv_size
= sizeof(struct vhci_hcd
),
1076 .start
= vhci_start
,
1079 .urb_enqueue
= vhci_urb_enqueue
,
1080 .urb_dequeue
= vhci_urb_dequeue
,
1082 .get_frame_number
= vhci_get_frame_number
,
1084 .hub_status_data
= vhci_hub_status
,
1085 .hub_control
= vhci_hub_control
,
1086 .bus_suspend
= vhci_bus_suspend
,
1087 .bus_resume
= vhci_bus_resume
,
1090 static int vhci_hcd_probe(struct platform_device
*pdev
)
1092 struct usb_hcd
*hcd
;
1095 usbip_uinfo("proving...\n");
1097 usbip_dbg_vhci_hc("name %s id %d\n", pdev
->name
, pdev
->id
);
1099 /* will be removed */
1100 if (pdev
->dev
.dma_mask
) {
1101 dev_info(&pdev
->dev
, "vhci_hcd DMA not supported\n");
1106 * Allocate and initialize hcd.
1107 * Our private data is also allocated automatically.
1109 hcd
= usb_create_hcd(&vhci_hc_driver
, &pdev
->dev
, dev_name(&pdev
->dev
));
1111 usbip_uerr("create hcd failed\n");
1116 /* this is private data for vhci_hcd */
1117 the_controller
= hcd_to_vhci(hcd
);
1120 * Finish generic HCD structure initialization and register.
1121 * Call the driver's reset() and start() routines.
1123 ret
= usb_add_hcd(hcd
, 0, 0);
1125 usbip_uerr("usb_add_hcd failed %d\n", ret
);
1127 the_controller
= NULL
;
1132 usbip_dbg_vhci_hc("bye\n");
1137 static int vhci_hcd_remove(struct platform_device
*pdev
)
1139 struct usb_hcd
*hcd
;
1141 hcd
= platform_get_drvdata(pdev
);
1146 * Disconnects the root hub,
1147 * then reverses the effects of usb_add_hcd(),
1148 * invoking the HCD's stop() methods.
1150 usb_remove_hcd(hcd
);
1152 the_controller
= NULL
;
1162 /* what should happen for USB/IP under suspend/resume? */
1163 static int vhci_hcd_suspend(struct platform_device
*pdev
, pm_message_t state
)
1165 struct usb_hcd
*hcd
;
1170 dev_dbg(&pdev
->dev
, "%s\n", __func__
);
1172 hcd
= platform_get_drvdata(pdev
);
1174 spin_lock(&the_controller
->lock
);
1176 for (rhport
= 0; rhport
< VHCI_NPORTS
; rhport
++)
1177 if (the_controller
->port_status
[rhport
] &
1178 USB_PORT_STAT_CONNECTION
)
1181 spin_unlock(&the_controller
->lock
);
1183 if (connected
> 0) {
1184 usbip_uinfo("We have %d active connection%s. Do not suspend.\n",
1185 connected
, (connected
== 1 ? "" : "s"));
1188 usbip_uinfo("suspend vhci_hcd");
1189 clear_bit(HCD_FLAG_HW_ACCESSIBLE
, &hcd
->flags
);
1195 static int vhci_hcd_resume(struct platform_device
*pdev
)
1197 struct usb_hcd
*hcd
;
1199 dev_dbg(&pdev
->dev
, "%s\n", __func__
);
1201 hcd
= platform_get_drvdata(pdev
);
1202 set_bit(HCD_FLAG_HW_ACCESSIBLE
, &hcd
->flags
);
1203 usb_hcd_poll_rh_status(hcd
);
1210 #define vhci_hcd_suspend NULL
1211 #define vhci_hcd_resume NULL
1216 static struct platform_driver vhci_driver
= {
1217 .probe
= vhci_hcd_probe
,
1218 .remove
= __devexit_p(vhci_hcd_remove
),
1219 .suspend
= vhci_hcd_suspend
,
1220 .resume
= vhci_hcd_resume
,
1222 .name
= (char *) driver_name
,
1223 .owner
= THIS_MODULE
,
1227 /*----------------------------------------------------------------------*/
1230 * The VHCI 'device' is 'virtual'; not a real plug&play hardware.
1231 * We need to add this virtual device as a platform device arbitrarily:
1232 * 1. platform_device_register()
1234 static void the_pdev_release(struct device
*dev
)
1239 static struct platform_device the_pdev
= {
1240 /* should be the same name as driver_name */
1241 .name
= (char *) driver_name
,
1244 /* .driver = &vhci_driver, */
1245 .release
= the_pdev_release
,
1249 static int __init
vhci_init(void)
1253 usbip_dbg_vhci_hc("enter\n");
1257 printk(KERN_INFO KBUILD_MODNAME
": %s, %s\n", driver_name
,
1260 ret
= platform_driver_register(&vhci_driver
);
1262 goto err_driver_register
;
1264 ret
= platform_device_register(&the_pdev
);
1266 goto err_platform_device_register
;
1268 usbip_dbg_vhci_hc("bye\n");
1271 /* error occurred */
1272 err_platform_device_register
:
1273 platform_driver_unregister(&vhci_driver
);
1275 err_driver_register
:
1276 usbip_dbg_vhci_hc("bye\n");
1279 module_init(vhci_init
);
1281 static void __exit
vhci_cleanup(void)
1283 usbip_dbg_vhci_hc("enter\n");
1285 platform_device_unregister(&the_pdev
);
1286 platform_driver_unregister(&vhci_driver
);
1288 usbip_dbg_vhci_hc("bye\n");
1290 module_exit(vhci_cleanup
);