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
);
171 /*----------------------------------------------------------------------*/
173 #define PORT_C_MASK \
174 ((USB_PORT_STAT_C_CONNECTION \
175 | USB_PORT_STAT_C_ENABLE \
176 | USB_PORT_STAT_C_SUSPEND \
177 | USB_PORT_STAT_C_OVERCURRENT \
178 | USB_PORT_STAT_C_RESET) << 16)
181 * This function is almostly the same as dummy_hcd.c:dummy_hub_status() without
182 * suspend/resume support. But, it is modified to provide multiple ports.
184 * @buf: a bitmap to show which port status has been changed.
185 * bit 0: reserved or used for another purpose?
186 * bit 1: the status of port 0 has been changed.
187 * bit 2: the status of port 1 has been changed.
189 * bit 7: the status of port 6 has been changed.
190 * bit 8: the status of port 7 has been changed.
192 * bit 15: the status of port 14 has been changed.
194 * So, the maximum number of ports is 31 ( port 0 to port 30) ?
196 * The return value is the actual transfered length in byte. If nothing has
197 * been changed, return 0. In the case that the number of ports is less than or
198 * equal to 6 (VHCI_NPORTS==7), return 1.
201 static int vhci_hub_status(struct usb_hcd
*hcd
, char *buf
)
203 struct vhci_hcd
*vhci
;
207 /* the enough buffer is allocated according to USB_MAXCHILDREN */
208 unsigned long *event_bits
= (unsigned long *) buf
;
215 vhci
= hcd_to_vhci(hcd
);
217 spin_lock_irqsave(&vhci
->lock
, flags
);
218 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE
, &hcd
->flags
)) {
219 usbip_dbg_vhci_rh("hw accessible flag in on?\n");
223 /* check pseudo status register for each port */
224 for (rhport
= 0; rhport
< VHCI_NPORTS
; rhport
++) {
225 if ((vhci
->port_status
[rhport
] & PORT_C_MASK
)) {
226 /* The status of a port has been changed, */
227 usbip_dbg_vhci_rh("port %d is changed\n", rhport
);
229 *event_bits
|= 1 << (rhport
+ 1);
234 usbip_uinfo("changed %d\n", changed
);
236 if (hcd
->state
== HC_STATE_SUSPENDED
)
237 usb_hcd_resume_root_hub(hcd
);
240 retval
= 1 + (VHCI_NPORTS
/ 8);
245 spin_unlock_irqrestore(&vhci
->lock
, flags
);
249 /* See hub_configure in hub.c */
250 static inline void hub_descriptor(struct usb_hub_descriptor
*desc
)
252 memset(desc
, 0, sizeof(*desc
));
253 desc
->bDescriptorType
= 0x29;
254 desc
->bDescLength
= 9;
255 desc
->wHubCharacteristics
= (__force __u16
)
256 (__constant_cpu_to_le16(0x0001));
257 desc
->bNbrPorts
= VHCI_NPORTS
;
258 desc
->bitmap
[0] = 0xff;
259 desc
->bitmap
[1] = 0xff;
262 static int vhci_hub_control(struct usb_hcd
*hcd
, u16 typeReq
, u16 wValue
,
263 u16 wIndex
, char *buf
, u16 wLength
)
265 struct vhci_hcd
*dum
;
270 u32 prev_port_status
[VHCI_NPORTS
];
272 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE
, &hcd
->flags
))
277 * wIndex shows the port number and begins from 1.
279 usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq
, wValue
,
281 if (wIndex
> VHCI_NPORTS
)
282 printk(KERN_ERR
"%s: invalid port number %d\n", __func__
,
284 rhport
= ((__u8
)(wIndex
& 0x00ff)) - 1;
286 dum
= hcd_to_vhci(hcd
);
288 spin_lock_irqsave(&dum
->lock
, flags
);
290 /* store old status and compare now and old later */
291 if (usbip_dbg_flag_vhci_rh
) {
293 for (i
= 0; i
< VHCI_NPORTS
; i
++)
294 prev_port_status
[i
] = dum
->port_status
[i
];
298 case ClearHubFeature
:
299 usbip_dbg_vhci_rh(" ClearHubFeature\n");
301 case ClearPortFeature
:
303 case USB_PORT_FEAT_SUSPEND
:
304 if (dum
->port_status
[rhport
] & USB_PORT_STAT_SUSPEND
) {
305 /* 20msec signaling */
308 jiffies
+ msecs_to_jiffies(20);
311 case USB_PORT_FEAT_POWER
:
312 usbip_dbg_vhci_rh(" ClearPortFeature: "
313 "USB_PORT_FEAT_POWER\n");
314 dum
->port_status
[rhport
] = 0;
315 /* dum->address = 0; */
319 case USB_PORT_FEAT_C_RESET
:
320 usbip_dbg_vhci_rh(" ClearPortFeature: "
321 "USB_PORT_FEAT_C_RESET\n");
322 switch (dum
->vdev
[rhport
].speed
) {
324 dum
->port_status
[rhport
] |=
325 USB_PORT_STAT_HIGH_SPEED
;
328 dum
->port_status
[rhport
] |=
329 USB_PORT_STAT_LOW_SPEED
;
335 usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n",
337 dum
->port_status
[rhport
] &= ~(1 << wValue
);
340 case GetHubDescriptor
:
341 usbip_dbg_vhci_rh(" GetHubDescriptor\n");
342 hub_descriptor((struct usb_hub_descriptor
*) buf
);
345 usbip_dbg_vhci_rh(" GetHubStatus\n");
346 *(__le32
*) buf
= __constant_cpu_to_le32(0);
349 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex
);
350 if (wIndex
> VHCI_NPORTS
|| wIndex
< 1) {
351 printk(KERN_ERR
"%s: invalid port number %d\n",
356 /* we do no care of resume. */
358 /* whoever resets or resumes must GetPortStatus to
361 if (dum
->resuming
&& time_after(jiffies
, dum
->re_timeout
)) {
362 printk(KERN_ERR
"%s: not yet\n", __func__
);
363 dum
->port_status
[rhport
] |=
364 (1 << USB_PORT_FEAT_C_SUSPEND
);
365 dum
->port_status
[rhport
] &=
366 ~(1 << USB_PORT_FEAT_SUSPEND
);
369 /* if (dum->driver && dum->driver->resume) {
370 * spin_unlock (&dum->lock);
371 * dum->driver->resume (&dum->gadget);
372 * spin_lock (&dum->lock);
376 if ((dum
->port_status
[rhport
] & (1 << USB_PORT_FEAT_RESET
)) !=
377 0 && time_after(jiffies
, dum
->re_timeout
)) {
378 dum
->port_status
[rhport
] |=
379 (1 << USB_PORT_FEAT_C_RESET
);
380 dum
->port_status
[rhport
] &=
381 ~(1 << USB_PORT_FEAT_RESET
);
384 if (dum
->vdev
[rhport
].ud
.status
==
385 VDEV_ST_NOTASSIGNED
) {
386 usbip_dbg_vhci_rh(" enable rhport %d "
389 dum
->vdev
[rhport
].ud
.status
);
390 dum
->port_status
[rhport
] |=
391 USB_PORT_STAT_ENABLE
;
396 dum
->port_status
[rhport
] |=
397 USB_PORT_STAT_ENABLE
;
398 /* give it the best speed we agree on */
399 dum
->gadget
.speed
= dum
->driver
->speed
;
400 dum
->gadget
.ep0
->maxpacket
= 64;
401 switch (dum
->gadget
.speed
) {
403 dum
->port_status
[rhport
] |=
404 USB_PORT_STAT_HIGH_SPEED
;
407 dum
->gadget
.ep0
->maxpacket
= 8;
408 dum
->port_status
[rhport
] |=
409 USB_PORT_STAT_LOW_SPEED
;
412 dum
->gadget
.speed
= USB_SPEED_FULL
;
419 ((u16
*) buf
)[0] = cpu_to_le16(dum
->port_status
[rhport
]);
421 cpu_to_le16(dum
->port_status
[rhport
] >> 16);
423 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16
*)buf
)[0],
427 usbip_dbg_vhci_rh(" SetHubFeature\n");
432 case USB_PORT_FEAT_SUSPEND
:
433 usbip_dbg_vhci_rh(" SetPortFeature: "
434 "USB_PORT_FEAT_SUSPEND\n");
435 printk(KERN_ERR
"%s: not yet\n", __func__
);
437 dum
->port_status
[rhport
] |=
438 (1 << USB_PORT_FEAT_SUSPEND
);
439 if (dum
->driver
->suspend
) {
440 spin_unlock(&dum
->lock
);
441 dum
->driver
->suspend(&dum
->gadget
);
442 spin_lock(&dum
->lock
);
446 case USB_PORT_FEAT_RESET
:
447 usbip_dbg_vhci_rh(" SetPortFeature: "
448 "USB_PORT_FEAT_RESET\n");
449 /* if it's already running, disconnect first */
450 if (dum
->port_status
[rhport
] & USB_PORT_STAT_ENABLE
) {
451 dum
->port_status
[rhport
] &=
452 ~(USB_PORT_STAT_ENABLE
|
453 USB_PORT_STAT_LOW_SPEED
|
454 USB_PORT_STAT_HIGH_SPEED
);
457 dev_dbg(hardware
, "disconnect\n");
458 stop_activity(dum
, dum
->driver
);
462 /* FIXME test that code path! */
464 /* 50msec reset signaling */
465 dum
->re_timeout
= jiffies
+ msecs_to_jiffies(50);
469 usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
471 dum
->port_status
[rhport
] |= (1 << wValue
);
476 printk(KERN_ERR
"%s: default: no such request\n", __func__
);
477 /* dev_dbg (hardware,
478 * "hub control req%04x v%04x i%04x l%d\n",
479 * typeReq, wValue, wIndex, wLength); */
481 /* "protocol stall" on error */
485 if (usbip_dbg_flag_vhci_rh
) {
486 printk(KERN_DEBUG
"port %d\n", rhport
);
487 dump_port_status(prev_port_status
[rhport
]);
488 dump_port_status(dum
->port_status
[rhport
]);
490 usbip_dbg_vhci_rh(" bye\n");
492 spin_unlock_irqrestore(&dum
->lock
, flags
);
499 /*----------------------------------------------------------------------*/
501 static struct vhci_device
*get_vdev(struct usb_device
*udev
)
508 for (i
= 0; i
< VHCI_NPORTS
; i
++)
509 if (the_controller
->vdev
[i
].udev
== udev
)
510 return port_to_vdev(i
);
515 static void vhci_tx_urb(struct urb
*urb
)
517 struct vhci_device
*vdev
= get_vdev(urb
->dev
);
518 struct vhci_priv
*priv
;
522 err("could not get virtual device");
527 priv
= kzalloc(sizeof(struct vhci_priv
), GFP_ATOMIC
);
529 spin_lock_irqsave(&vdev
->priv_lock
, flag
);
532 dev_err(&urb
->dev
->dev
, "malloc vhci_priv\n");
533 spin_unlock_irqrestore(&vdev
->priv_lock
, flag
);
534 usbip_event_add(&vdev
->ud
, VDEV_EVENT_ERROR_MALLOC
);
538 priv
->seqnum
= atomic_inc_return(&the_controller
->seqnum
);
539 if (priv
->seqnum
== 0xffff)
540 usbip_uinfo("seqnum max\n");
545 urb
->hcpriv
= (void *) priv
;
548 list_add_tail(&priv
->list
, &vdev
->priv_tx
);
550 wake_up(&vdev
->waitq_tx
);
551 spin_unlock_irqrestore(&vdev
->priv_lock
, flag
);
554 static int vhci_urb_enqueue(struct usb_hcd
*hcd
, struct urb
*urb
,
557 struct device
*dev
= &urb
->dev
->dev
;
561 usbip_dbg_vhci_hc("enter, usb_hcd %p urb %p mem_flags %d\n",
562 hcd
, urb
, mem_flags
);
564 /* patch to usb_sg_init() is in 2.5.60 */
565 BUG_ON(!urb
->transfer_buffer
&& urb
->transfer_buffer_length
);
567 spin_lock_irqsave(&the_controller
->lock
, flags
);
569 if (urb
->status
!= -EINPROGRESS
) {
570 dev_err(dev
, "URB already unlinked!, status %d\n", urb
->status
);
571 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
575 ret
= usb_hcd_link_urb_to_ep(hcd
, urb
);
580 * The enumeration process is as follows;
582 * 1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
583 * to get max packet length of default pipe
585 * 2. Set_Address request to DevAddr(0) EndPoint(0)
589 if (usb_pipedevice(urb
->pipe
) == 0) {
590 __u8 type
= usb_pipetype(urb
->pipe
);
591 struct usb_ctrlrequest
*ctrlreq
=
592 (struct usb_ctrlrequest
*) urb
->setup_packet
;
593 struct vhci_device
*vdev
=
594 port_to_vdev(the_controller
->pending_port
);
596 if (type
!= PIPE_CONTROL
|| !ctrlreq
) {
597 dev_err(dev
, "invalid request to devnum 0\n");
602 switch (ctrlreq
->bRequest
) {
603 case USB_REQ_SET_ADDRESS
:
604 /* set_address may come when a device is reset */
605 dev_info(dev
, "SetAddress Request (%d) to port %d\n",
606 ctrlreq
->wValue
, vdev
->rhport
);
608 vdev
->udev
= urb
->dev
;
610 spin_lock(&vdev
->ud
.lock
);
611 vdev
->ud
.status
= VDEV_ST_USED
;
612 spin_unlock(&vdev
->ud
.lock
);
614 if (urb
->status
== -EINPROGRESS
) {
615 /* This request is successfully completed. */
616 /* If not -EINPROGRESS, possibly unlinked. */
622 case USB_REQ_GET_DESCRIPTOR
:
623 if (ctrlreq
->wValue
== (USB_DT_DEVICE
<< 8))
624 usbip_dbg_vhci_hc("Not yet?: "
625 "Get_Descriptor to device 0 "
626 "(get max pipe size)\n");
628 /* FIXME: reference count? (usb_get_dev()) */
629 vdev
->udev
= urb
->dev
;
634 dev_err(dev
, "invalid request to devnum 0 bRequest %u, "
635 "wValue %u\n", ctrlreq
->bRequest
,
646 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
651 usb_hcd_unlink_urb_from_ep(hcd
, urb
);
653 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
655 usb_hcd_giveback_urb(vhci_to_hcd(the_controller
), urb
, urb
->status
);
661 * vhci_rx gives back the urb after receiving the reply of the urb. If an
662 * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
663 * back its urb. For the driver unlinking the urb, the content of the urb is
664 * not important, but the calling to its completion handler is important; the
665 * completion of unlinking is notified by the completion handler.
670 * - When vhci_hcd receives RET_SUBMIT,
672 * - case 1a). the urb of the pdu is not unlinking.
674 * => just give back the urb
676 * - case 1b). the urb of the pdu is unlinking.
677 * - usbip.ko will return a reply of the unlinking request.
678 * => give back the urb now and go to case 2b).
680 * - When vhci_hcd receives RET_UNLINK,
682 * - case 2a). a submit request is still pending in vhci_hcd.
683 * - urb was really pending in usbip.ko and urb_unlink_urb() was
685 * => free a pending submit request
686 * => notify unlink completeness by giving back the urb
688 * - case 2b). a submit request is *not* pending in vhci_hcd.
689 * - urb was already given back to the core driver.
690 * => do not give back the urb
695 * - When usbip receives CMD_UNLINK,
697 * - case 3a). the urb of the unlink request is now in submission.
698 * => do usb_unlink_urb().
699 * => after the unlink is completed, send RET_UNLINK.
701 * - case 3b). the urb of the unlink request is not in submission.
702 * - may be already completed or never be received
706 static int vhci_urb_dequeue(struct usb_hcd
*hcd
, struct urb
*urb
, int status
)
709 struct vhci_priv
*priv
;
710 struct vhci_device
*vdev
;
712 usbip_uinfo("vhci_hcd: dequeue a urb %p\n", urb
);
715 spin_lock_irqsave(&the_controller
->lock
, flags
);
719 /* URB was never linked! or will be soon given back by
721 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
727 ret
= usb_hcd_check_unlink_urb(hcd
, urb
, status
);
729 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
734 /* send unlink request here? */
737 if (!vdev
->ud
.tcp_socket
) {
738 /* tcp connection is closed */
739 unsigned long flags2
;
741 spin_lock_irqsave(&vdev
->priv_lock
, flags2
);
743 usbip_uinfo("vhci_hcd: device %p seems to be disconnected\n",
745 list_del(&priv
->list
);
749 spin_unlock_irqrestore(&vdev
->priv_lock
, flags2
);
752 * If tcp connection is alive, we have sent CMD_UNLINK.
753 * vhci_rx will receive RET_UNLINK and give back the URB.
754 * Otherwise, we give back it here.
756 usbip_uinfo("vhci_hcd: vhci_urb_dequeue() gives back urb %p\n",
759 usb_hcd_unlink_urb_from_ep(hcd
, urb
);
761 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
762 usb_hcd_giveback_urb(vhci_to_hcd(the_controller
), urb
,
764 spin_lock_irqsave(&the_controller
->lock
, flags
);
767 /* tcp connection is alive */
768 unsigned long flags2
;
769 struct vhci_unlink
*unlink
;
771 spin_lock_irqsave(&vdev
->priv_lock
, flags2
);
773 /* setup CMD_UNLINK pdu */
774 unlink
= kzalloc(sizeof(struct vhci_unlink
), GFP_ATOMIC
);
776 usbip_uerr("malloc vhci_unlink\n");
777 spin_unlock_irqrestore(&vdev
->priv_lock
, flags2
);
778 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
779 usbip_event_add(&vdev
->ud
, VDEV_EVENT_ERROR_MALLOC
);
783 unlink
->seqnum
= atomic_inc_return(&the_controller
->seqnum
);
784 if (unlink
->seqnum
== 0xffff)
785 usbip_uinfo("seqnum max\n");
787 unlink
->unlink_seqnum
= priv
->seqnum
;
789 usbip_uinfo("vhci_hcd: device %p seems to be still connected\n",
792 /* send cmd_unlink and try to cancel the pending URB in the
794 list_add_tail(&unlink
->list
, &vdev
->unlink_tx
);
795 wake_up(&vdev
->waitq_tx
);
797 spin_unlock_irqrestore(&vdev
->priv_lock
, flags2
);
801 if (!vdev
->ud
.tcp_socket
) {
802 /* tcp connection is closed */
803 usbip_uinfo("vhci_hcd: vhci_urb_dequeue() gives back urb %p\n",
806 usb_hcd_unlink_urb_from_ep(hcd
, urb
);
808 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
809 usb_hcd_giveback_urb(vhci_to_hcd(the_controller
), urb
,
811 spin_lock_irqsave(&the_controller
->lock
, flags
);
814 spin_unlock_irqrestore(&the_controller
->lock
, flags
);
816 usbip_dbg_vhci_hc("leave\n");
821 static void vhci_device_unlink_cleanup(struct vhci_device
*vdev
)
823 struct vhci_unlink
*unlink
, *tmp
;
825 spin_lock(&vdev
->priv_lock
);
827 list_for_each_entry_safe(unlink
, tmp
, &vdev
->unlink_tx
, list
) {
828 list_del(&unlink
->list
);
832 list_for_each_entry_safe(unlink
, tmp
, &vdev
->unlink_rx
, list
) {
833 list_del(&unlink
->list
);
837 spin_unlock(&vdev
->priv_lock
);
841 * The important thing is that only one context begins cleanup.
842 * This is why error handling and cleanup become simple.
843 * We do not want to consider race condition as possible.
845 static void vhci_shutdown_connection(struct usbip_device
*ud
)
847 struct vhci_device
*vdev
= container_of(ud
, struct vhci_device
, ud
);
849 /* need this? see stub_dev.c */
850 if (ud
->tcp_socket
) {
851 usbip_udbg("shutdown tcp_socket %p\n", ud
->tcp_socket
);
852 kernel_sock_shutdown(ud
->tcp_socket
, SHUT_RDWR
);
855 usbip_stop_threads(&vdev
->ud
);
856 usbip_uinfo("stop threads\n");
858 /* active connection is closed */
859 if (vdev
->ud
.tcp_socket
!= NULL
) {
860 sock_release(vdev
->ud
.tcp_socket
);
861 vdev
->ud
.tcp_socket
= NULL
;
863 usbip_uinfo("release socket\n");
865 vhci_device_unlink_cleanup(vdev
);
868 * rh_port_disconnect() is a trigger of ...
869 * usb_disable_device():
870 * disable all the endpoints for a USB device.
871 * usb_disable_endpoint():
872 * disable endpoints. pending urbs are unlinked(dequeued).
874 * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
875 * deteched device should release used urbs in a cleanup function(i.e.
876 * xxx_disconnect()). Therefore, vhci_hcd does not need to release
877 * pushed urbs and their private data in this function.
879 * NOTE: vhci_dequeue() must be considered carefully. When shutdowning
880 * a connection, vhci_shutdown_connection() expects vhci_dequeue()
881 * gives back pushed urbs and frees their private data by request of
882 * the cleanup function of a USB driver. When unlinking a urb with an
883 * active connection, vhci_dequeue() does not give back the urb which
884 * is actually given back by vhci_rx after receiving its return pdu.
887 rh_port_disconnect(vdev
->rhport
);
889 usbip_uinfo("disconnect device\n");
893 static void vhci_device_reset(struct usbip_device
*ud
)
895 struct vhci_device
*vdev
= container_of(ud
, struct vhci_device
, ud
);
897 spin_lock(&ud
->lock
);
902 ud
->tcp_socket
= NULL
;
904 ud
->status
= VDEV_ST_NULL
;
906 spin_unlock(&ud
->lock
);
909 static void vhci_device_unusable(struct usbip_device
*ud
)
911 spin_lock(&ud
->lock
);
913 ud
->status
= VDEV_ST_ERROR
;
915 spin_unlock(&ud
->lock
);
918 static void vhci_device_init(struct vhci_device
*vdev
)
920 memset(vdev
, 0, sizeof(*vdev
));
922 usbip_task_init(&vdev
->ud
.tcp_rx
, "vhci_rx", vhci_rx_loop
);
923 usbip_task_init(&vdev
->ud
.tcp_tx
, "vhci_tx", vhci_tx_loop
);
925 vdev
->ud
.side
= USBIP_VHCI
;
926 vdev
->ud
.status
= VDEV_ST_NULL
;
927 /* vdev->ud.lock = SPIN_LOCK_UNLOCKED; */
928 spin_lock_init(&vdev
->ud
.lock
);
930 INIT_LIST_HEAD(&vdev
->priv_rx
);
931 INIT_LIST_HEAD(&vdev
->priv_tx
);
932 INIT_LIST_HEAD(&vdev
->unlink_tx
);
933 INIT_LIST_HEAD(&vdev
->unlink_rx
);
934 /* vdev->priv_lock = SPIN_LOCK_UNLOCKED; */
935 spin_lock_init(&vdev
->priv_lock
);
937 init_waitqueue_head(&vdev
->waitq_tx
);
939 vdev
->ud
.eh_ops
.shutdown
= vhci_shutdown_connection
;
940 vdev
->ud
.eh_ops
.reset
= vhci_device_reset
;
941 vdev
->ud
.eh_ops
.unusable
= vhci_device_unusable
;
943 usbip_start_eh(&vdev
->ud
);
947 /*----------------------------------------------------------------------*/
949 static int vhci_start(struct usb_hcd
*hcd
)
951 struct vhci_hcd
*vhci
= hcd_to_vhci(hcd
);
955 usbip_dbg_vhci_hc("enter vhci_start\n");
958 /* initialize private data of usb_hcd */
960 for (rhport
= 0; rhport
< VHCI_NPORTS
; rhport
++) {
961 struct vhci_device
*vdev
= &vhci
->vdev
[rhport
];
962 vhci_device_init(vdev
);
963 vdev
->rhport
= rhport
;
966 atomic_set(&vhci
->seqnum
, 0);
967 spin_lock_init(&vhci
->lock
);
971 hcd
->power_budget
= 0; /* no limit */
972 hcd
->state
= HC_STATE_RUNNING
;
973 hcd
->uses_new_polling
= 1;
976 /* vhci_hcd is now ready to be controlled through sysfs */
977 err
= sysfs_create_group(&vhci_dev(vhci
)->kobj
, &dev_attr_group
);
979 usbip_uerr("create sysfs files\n");
986 static void vhci_stop(struct usb_hcd
*hcd
)
988 struct vhci_hcd
*vhci
= hcd_to_vhci(hcd
);
991 usbip_dbg_vhci_hc("stop VHCI controller\n");
994 /* 1. remove the userland interface of vhci_hcd */
995 sysfs_remove_group(&vhci_dev(vhci
)->kobj
, &dev_attr_group
);
997 /* 2. shutdown all the ports of vhci_hcd */
998 for (rhport
= 0 ; rhport
< VHCI_NPORTS
; rhport
++) {
999 struct vhci_device
*vdev
= &vhci
->vdev
[rhport
];
1001 usbip_event_add(&vdev
->ud
, VDEV_EVENT_REMOVED
);
1002 usbip_stop_eh(&vdev
->ud
);
1006 usbip_uinfo("vhci_stop done\n");
1009 /*----------------------------------------------------------------------*/
1011 static int vhci_get_frame_number(struct usb_hcd
*hcd
)
1013 usbip_uerr("Not yet implemented\n");
1020 /* FIXME: suspend/resume */
1021 static int vhci_bus_suspend(struct usb_hcd
*hcd
)
1023 struct vhci_hcd
*vhci
= hcd_to_vhci(hcd
);
1025 dev_dbg(&hcd
->self
.root_hub
->dev
, "%s\n", __func__
);
1027 spin_lock_irq(&vhci
->lock
);
1028 /* vhci->rh_state = DUMMY_RH_SUSPENDED;
1029 * set_link_state(vhci); */
1030 hcd
->state
= HC_STATE_SUSPENDED
;
1031 spin_unlock_irq(&vhci
->lock
);
1036 static int vhci_bus_resume(struct usb_hcd
*hcd
)
1038 struct vhci_hcd
*vhci
= hcd_to_vhci(hcd
);
1041 dev_dbg(&hcd
->self
.root_hub
->dev
, "%s\n", __func__
);
1043 spin_lock_irq(&vhci
->lock
);
1044 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE
, &hcd
->flags
)) {
1047 /* vhci->rh_state = DUMMY_RH_RUNNING;
1048 * set_link_state(vhci);
1049 * if (!list_empty(&vhci->urbp_list))
1050 * mod_timer(&vhci->timer, jiffies); */
1051 hcd
->state
= HC_STATE_RUNNING
;
1053 spin_unlock_irq(&vhci
->lock
);
1061 #define vhci_bus_suspend NULL
1062 #define vhci_bus_resume NULL
1067 static struct hc_driver vhci_hc_driver
= {
1068 .description
= driver_name
,
1069 .product_desc
= driver_desc
,
1070 .hcd_priv_size
= sizeof(struct vhci_hcd
),
1074 .start
= vhci_start
,
1077 .urb_enqueue
= vhci_urb_enqueue
,
1078 .urb_dequeue
= vhci_urb_dequeue
,
1080 .get_frame_number
= vhci_get_frame_number
,
1082 .hub_status_data
= vhci_hub_status
,
1083 .hub_control
= vhci_hub_control
,
1084 .bus_suspend
= vhci_bus_suspend
,
1085 .bus_resume
= vhci_bus_resume
,
1088 static int vhci_hcd_probe(struct platform_device
*pdev
)
1090 struct usb_hcd
*hcd
;
1093 usbip_uinfo("proving...\n");
1095 usbip_dbg_vhci_hc("name %s id %d\n", pdev
->name
, pdev
->id
);
1097 /* will be removed */
1098 if (pdev
->dev
.dma_mask
) {
1099 dev_info(&pdev
->dev
, "vhci_hcd DMA not supported\n");
1104 * Allocate and initialize hcd.
1105 * Our private data is also allocated automatically.
1107 hcd
= usb_create_hcd(&vhci_hc_driver
, &pdev
->dev
, dev_name(&pdev
->dev
));
1109 usbip_uerr("create hcd failed\n");
1114 /* this is private data for vhci_hcd */
1115 the_controller
= hcd_to_vhci(hcd
);
1118 * Finish generic HCD structure initialization and register.
1119 * Call the driver's reset() and start() routines.
1121 ret
= usb_add_hcd(hcd
, 0, 0);
1123 usbip_uerr("usb_add_hcd failed %d\n", ret
);
1125 the_controller
= NULL
;
1130 usbip_dbg_vhci_hc("bye\n");
1135 static int vhci_hcd_remove(struct platform_device
*pdev
)
1137 struct usb_hcd
*hcd
;
1139 hcd
= platform_get_drvdata(pdev
);
1144 * Disconnects the root hub,
1145 * then reverses the effects of usb_add_hcd(),
1146 * invoking the HCD's stop() methods.
1148 usb_remove_hcd(hcd
);
1150 the_controller
= NULL
;
1160 /* what should happen for USB/IP under suspend/resume? */
1161 static int vhci_hcd_suspend(struct platform_device
*pdev
, pm_message_t state
)
1163 struct usb_hcd
*hcd
;
1168 dev_dbg(&pdev
->dev
, "%s\n", __func__
);
1170 hcd
= platform_get_drvdata(pdev
);
1172 spin_lock(&the_controller
->lock
);
1174 for (rhport
= 0; rhport
< VHCI_NPORTS
; rhport
++)
1175 if (the_controller
->port_status
[rhport
] &
1176 USB_PORT_STAT_CONNECTION
)
1179 spin_unlock(&the_controller
->lock
);
1181 if (connected
> 0) {
1182 usbip_uinfo("We have %d active connection%s. Do not suspend.\n",
1183 connected
, (connected
== 1 ? "" : "s"));
1186 usbip_uinfo("suspend vhci_hcd");
1187 clear_bit(HCD_FLAG_HW_ACCESSIBLE
, &hcd
->flags
);
1193 static int vhci_hcd_resume(struct platform_device
*pdev
)
1195 struct usb_hcd
*hcd
;
1197 dev_dbg(&pdev
->dev
, "%s\n", __func__
);
1199 hcd
= platform_get_drvdata(pdev
);
1200 set_bit(HCD_FLAG_HW_ACCESSIBLE
, &hcd
->flags
);
1201 usb_hcd_poll_rh_status(hcd
);
1208 #define vhci_hcd_suspend NULL
1209 #define vhci_hcd_resume NULL
1214 static struct platform_driver vhci_driver
= {
1215 .probe
= vhci_hcd_probe
,
1216 .remove
= __devexit_p(vhci_hcd_remove
),
1217 .suspend
= vhci_hcd_suspend
,
1218 .resume
= vhci_hcd_resume
,
1220 .name
= (char *) driver_name
,
1221 .owner
= THIS_MODULE
,
1225 /*----------------------------------------------------------------------*/
1228 * The VHCI 'device' is 'virtual'; not a real plug&play hardware.
1229 * We need to add this virtual device as a platform device arbitrarily:
1230 * 1. platform_device_register()
1232 static void the_pdev_release(struct device
*dev
)
1237 static struct platform_device the_pdev
= {
1238 /* should be the same name as driver_name */
1239 .name
= (char *) driver_name
,
1242 /* .driver = &vhci_driver, */
1243 .release
= the_pdev_release
,
1247 static int __init
vhci_init(void)
1251 usbip_dbg_vhci_hc("enter\n");
1255 printk(KERN_INFO KBUILD_MODNAME
": %s, %s\n", driver_name
,
1258 ret
= platform_driver_register(&vhci_driver
);
1260 goto err_driver_register
;
1262 ret
= platform_device_register(&the_pdev
);
1264 goto err_platform_device_register
;
1266 usbip_dbg_vhci_hc("bye\n");
1269 /* error occurred */
1270 err_platform_device_register
:
1271 platform_driver_unregister(&vhci_driver
);
1273 err_driver_register
:
1274 usbip_dbg_vhci_hc("bye\n");
1277 module_init(vhci_init
);
1279 static void __exit
vhci_cleanup(void)
1281 usbip_dbg_vhci_hc("enter\n");
1283 platform_device_unregister(&the_pdev
);
1284 platform_driver_unregister(&vhci_driver
);
1286 usbip_dbg_vhci_hc("bye\n");
1288 module_exit(vhci_cleanup
);