WebSVN - shark - Blame - Rev 846 - /shark/trunk/drivers/usb/core/hub.c

Rev	Author	Line No.	Line
846	giacomo	1	/*
		2	* USB hub driver.
		3	*
		4	* (C) Copyright 1999 Linus Torvalds
		5	* (C) Copyright 1999 Johannes Erdfelt
		6	* (C) Copyright 1999 Gregory P. Smith
		7	* (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
		8	*
		9	*/
		10
		11	#include <linuxcomp.h>
		12
		13	#include <linux/config.h>
		14	#include <linux/kernel.h>
		15	#include <linux/errno.h>
		16	#include <linux/module.h>
		17	#include <linux/completion.h>
		18	#include <linux/sched.h>
		19	#include <linux/list.h>
		20	#include <linux/slab.h>
		21	#include <linux/smp_lock.h>
		22	#include <linux/ioctl.h>
		23	#ifdef CONFIG_USB_DEBUG
		24	#define DEBUG
		25	#else
		26	#undef DEBUG
		27	#endif
		28	#include <linux/usb.h>
		29	#include <linux/usbdevice_fs.h>
		30	#include <linux/suspend.h>
		31
		32	#include <asm/semaphore.h>
		33	#include <asm/uaccess.h>
		34	#include <asm/byteorder.h>
		35
		36	#include "hcd.h"
		37	#include "hub.h"
		38
		39	/* Wakes up khubd */
		40	static spinlock_t hub_event_lock = SPIN_LOCK_UNLOCKED;
		41	static DECLARE_MUTEX(usb_address0_sem);
		42
		43	static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
		44	static LIST_HEAD(hub_list); /* List of all hubs (for cleanup) */
		45
		46	static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
		47	static pid_t khubd_pid = 0; /* PID of khubd */
		48	static DECLARE_COMPLETION(khubd_exited);
		49
		50	//#ifdef DEBUG
		51	static inline char *portspeed (int portstatus)
		52	{
		53	if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
		54	return "480 Mb/s";
		55	else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
		56	return "1.5 Mb/s";
		57	else
		58	return "12 Mb/s";
		59	}
		60	//#endif
		61
		62	/* for dev_info, dev_dbg, etc */
		63	static inline struct device hubdev (struct usb_device dev)
		64	{
		65	return &dev->actconfig->interface[0]->dev;
		66	}
		67
		68	/* USB 2.0 spec Section 11.24.4.5 */
		69	static int get_hub_descriptor(struct usb_device dev, void data, int size)
		70	{
		71	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
		72	USB_REQ_GET_DESCRIPTOR, USB_DIR_IN \| USB_RT_HUB,
		73	USB_DT_HUB << 8, 0, data, size, HZ * USB_CTRL_GET_TIMEOUT);
		74	}
		75
		76	/*
		77	* USB 2.0 spec Section 11.24.2.1
		78	*/
		79	static int clear_hub_feature(struct usb_device *dev, int feature)
		80	{
		81	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		82	USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, HZ);
		83	}
		84
		85	/*
		86	* USB 2.0 spec Section 11.24.2.2
		87	* BUG: doesn't handle port indicator selector in high byte of wIndex
		88	*/
		89	static int clear_port_feature(struct usb_device *dev, int port, int feature)
		90	{
		91	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		92	USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port, NULL, 0, HZ);
		93	}
		94
		95	/*
		96	* USB 2.0 spec Section 11.24.2.13
		97	* BUG: doesn't handle port indicator selector in high byte of wIndex
		98	*/
		99	static int set_port_feature(struct usb_device *dev, int port, int feature)
		100	{
		101	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		102	USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port, NULL, 0, HZ);
		103	}
		104
		105	/*
		106	* USB 2.0 spec Section 11.24.2.6
		107	*/
		108	static int get_hub_status(struct usb_device *dev,
		109	struct usb_hub_status *data)
		110	{
		111	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
		112	USB_REQ_GET_STATUS, USB_DIR_IN \| USB_RT_HUB, 0, 0,
		113	data, sizeof(data), HZ USB_CTRL_GET_TIMEOUT);
		114	}
		115
		116	/*
		117	* USB 2.0 spec Section 11.24.2.7
		118	*/
		119	static int get_port_status(struct usb_device *dev, int port,
		120	struct usb_port_status *data)
		121	{
		122	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
		123	USB_REQ_GET_STATUS, USB_DIR_IN \| USB_RT_PORT, 0, port,
		124	data, sizeof(data), HZ USB_CTRL_GET_TIMEOUT);
		125	}
		126
		127	/* completion function, fires on port status changes and various faults */
		128	static void hub_irq(struct urb urb, struct pt_regs regs)
		129	{
		130	struct usb_hub hub = (struct usb_hub )urb->context;
		131	unsigned long flags;
		132	int status;
		133
		134	switch (urb->status) {
		135	case -ENOENT: /* synchronous unlink */
		136	case -ECONNRESET: /* async unlink */
		137	case -ESHUTDOWN: /* hardware going away */
		138	return;
		139
		140	default: /* presumably an error */
		141	/* Cause a hub reset after 10 consecutive errors */
		142	dev_dbg (&hub->intf->dev, "transfer --> %d\n", urb->status);
		143	if ((++hub->nerrors < 10) \|\| hub->error)
		144	goto resubmit;
		145	hub->error = urb->status;
		146	/* FALL THROUGH */
		147
		148	/* let khubd handle things */
		149	case 0: /* we got data: port status changed */
		150	break;
		151	}
		152
		153	hub->nerrors = 0;
		154
		155	/* Something happened, let khubd figure it out */
		156	spin_lock_irqsave(&hub_event_lock, flags);
		157	if (list_empty(&hub->event_list)) {
		158	list_add(&hub->event_list, &hub_event_list);
		159	wake_up(&khubd_wait);
		160	}
		161	spin_unlock_irqrestore(&hub_event_lock, flags);
		162
		163	resubmit:
		164	if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
		165	/* ENODEV means we raced disconnect() */
		166	&& status != -ENODEV)
		167	dev_err (&hub->intf->dev, "resubmit --> %d\n", urb->status);
		168	}
		169
		170	/* USB 2.0 spec Section 11.24.2.3 */
		171	static inline int
		172	hub_clear_tt_buffer (struct usb_device *hub, u16 devinfo, u16 tt)
		173	{
		174	return usb_control_msg (hub, usb_rcvctrlpipe (hub, 0),
		175	HUB_CLEAR_TT_BUFFER, USB_DIR_IN \| USB_RECIP_OTHER,
		176	devinfo, tt, 0, 0, HZ);
		177	}
		178
		179	/*
		180	* enumeration blocks khubd for a long time. we use keventd instead, since
		181	* long blocking there is the exception, not the rule. accordingly, HCDs
		182	* talking to TTs must queue control transfers (not just bulk and iso), so
		183	* both can talk to the same hub concurrently.
		184	*/
		185	static void hub_tt_kevent (void *arg)
		186	{
		187	struct usb_hub *hub = arg;
		188	unsigned long flags;
		189
		190	spin_lock_irqsave (&hub->tt.lock, flags);
		191	while (!list_empty (&hub->tt.clear_list)) {
		192	struct list_head *temp;
		193	struct usb_tt_clear *clear;
		194	struct usb_device *dev;
		195	int status;
		196
		197	temp = hub->tt.clear_list.next;
		198	clear = list_entry (temp, struct usb_tt_clear, clear_list);
		199	list_del (&clear->clear_list);
		200
		201	/* drop lock so HCD can concurrently report other TT errors */
		202	spin_unlock_irqrestore (&hub->tt.lock, flags);
		203	dev = interface_to_usbdev (hub->intf);
		204	status = hub_clear_tt_buffer (dev, clear->devinfo, clear->tt);
		205	spin_lock_irqsave (&hub->tt.lock, flags);
		206
		207	if (status)
		208	err ("usb-%s-%s clear tt %d (%04x) error %d",
		209	dev->bus->bus_name, dev->devpath,
		210	clear->tt, clear->devinfo, status);
		211	kfree (clear);
		212	}
		213	spin_unlock_irqrestore (&hub->tt.lock, flags);
		214	}
		215
		216	/**
		217	* usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
		218	* @dev: the device whose split transaction failed
		219	* @pipe: identifies the endpoint of the failed transaction
		220	*
		221	* High speed HCDs use this to tell the hub driver that some split control or
		222	* bulk transaction failed in a way that requires clearing internal state of
		223	* a transaction translator. This is normally detected (and reported) from
		224	* interrupt context.
		225	*
		226	* It may not be possible for that hub to handle additional full (or low)
		227	* speed transactions until that state is fully cleared out.
		228	*/
		229	void usb_hub_tt_clear_buffer (struct usb_device *dev, int pipe)
		230	{
		231	struct usb_tt *tt = dev->tt;
		232	unsigned long flags;
		233	struct usb_tt_clear *clear;
		234
		235	/* we've got to cope with an arbitrary number of pending TT clears,
		236	* since each TT has "at least two" buffers that can need it (and
		237	* there can be many TTs per hub). even if they're uncommon.
		238	*/
		239	if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == 0) {
		240	err ("can't save CLEAR_TT_BUFFER state for hub at usb-%s-%s",
		241	dev->bus->bus_name, tt->hub->devpath);
		242	/* FIXME recover somehow ... RESET_TT? */
		243	return;
		244	}
		245
		246	/* info that CLEAR_TT_BUFFER needs */
		247	clear->tt = tt->multi ? dev->ttport : 1;
		248	clear->devinfo = usb_pipeendpoint (pipe);
		249	clear->devinfo \|= dev->devnum << 4;
		250	clear->devinfo \|= usb_pipecontrol (pipe)
		251	? (USB_ENDPOINT_XFER_CONTROL << 11)
		252	: (USB_ENDPOINT_XFER_BULK << 11);
		253	if (usb_pipein (pipe))
		254	clear->devinfo \|= 1 << 15;
		255
		256	/* tell keventd to clear state for this TT */
		257	spin_lock_irqsave (&tt->lock, flags);
		258	list_add_tail (&clear->clear_list, &tt->clear_list);
		259	schedule_work (&tt->kevent);
		260	spin_unlock_irqrestore (&tt->lock, flags);
		261	}
		262
		263	static void hub_power_on(struct usb_hub *hub)
		264	{
		265	struct usb_device *dev;
		266	int i;
		267
		268	/* Enable power to the ports */
		269	dev_dbg(hubdev(interface_to_usbdev(hub->intf)),
		270	"enabling power on all ports\n");
		271	dev = interface_to_usbdev(hub->intf);
		272	for (i = 0; i < hub->descriptor->bNbrPorts; i++)
		273	set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
		274
		275	/* Wait for power to be enabled */
		276	wait_ms(hub->descriptor->bPwrOn2PwrGood * 2);
		277	}
		278
		279	static int hub_hub_status(struct usb_hub *hub,
		280	u16 status, u16 change)
		281	{
		282	struct usb_device *dev = interface_to_usbdev (hub->intf);
		283	int ret;
		284
		285	ret = get_hub_status(dev, &hub->status->hub);
		286	if (ret < 0)
		287	dev_err (hubdev (dev),
		288	"%s failed (err = %d)\n", __FUNCTION__, ret);
		289	else {
		290	*status = le16_to_cpu(hub->status->hub.wHubStatus);
		291	*change = le16_to_cpu(hub->status->hub.wHubChange);
		292	ret = 0;
		293	}
		294	return ret;
		295	}
		296
		297	static int hub_configure(struct usb_hub *hub,
		298	struct usb_endpoint_descriptor *endpoint)
		299	{
		300	struct usb_device *dev = interface_to_usbdev (hub->intf);
		301	struct device *hub_dev;
		302	u16 hubstatus, hubchange;
		303	unsigned int pipe;
		304	int maxp, ret;
		305	char *message;
		306
		307	hub->buffer = usb_buffer_alloc(dev, sizeof(*hub->buffer), GFP_KERNEL,
		308	&hub->buffer_dma);
		309	if (!hub->buffer) {
		310	message = "can't allocate hub irq buffer";
		311	ret = -ENOMEM;
		312	goto fail;
		313	}
		314
		315	hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
		316	if (!hub->status) {
		317	message = "can't kmalloc hub status buffer";
		318	ret = -ENOMEM;
		319	goto fail;
		320	}
		321
		322	hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
		323	if (!hub->descriptor) {
		324	message = "can't kmalloc hub descriptor";
		325	ret = -ENOMEM;
		326	goto fail;
		327	}
		328
		329	/* Request the entire hub descriptor.
		330	* hub->descriptor can handle USB_MAXCHILDREN ports,
		331	* but the hub can/will return fewer bytes here.
		332	*/
		333	ret = get_hub_descriptor(dev, hub->descriptor,
		334	sizeof(*hub->descriptor));
		335	if (ret < 0) {
		336	message = "can't read hub descriptor";
		337	goto fail;
		338	} else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
		339	message = "hub has too many ports!";
		340	ret = -ENODEV;
		341	goto fail;
		342	}
		343
		344	hub_dev = hubdev(dev);
		345	dev->maxchild = hub->descriptor->bNbrPorts;
		346	dev_info (hub_dev, "%d port%s detected\n", dev->maxchild,
		347	(dev->maxchild == 1) ? "" : "s");
		348
		349	le16_to_cpus(&hub->descriptor->wHubCharacteristics);
		350
		351	if (hub->descriptor->wHubCharacteristics & HUB_CHAR_COMPOUND) {
		352	int i;
		353	char portstr [USB_MAXCHILDREN + 1];
		354
		355	for (i = 0; i < dev->maxchild; i++)
		356	portstr[i] = hub->descriptor->DeviceRemovable
		357	[((i + 1) / 8)] & (1 << ((i + 1) % 8))
		358	? 'F' : 'R';
		359	portstr[dev->maxchild] = 0;
		360	dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
		361	} else
		362	dev_dbg(hub_dev, "standalone hub\n");
		363
		364	switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) {
		365	case 0x00:
		366	dev_dbg(hub_dev, "ganged power switching\n");
		367	break;
		368	case 0x01:
		369	dev_dbg(hub_dev, "individual port power switching\n");
		370	break;
		371	case 0x02:
		372	case 0x03:
		373	dev_dbg(hub_dev, "unknown reserved power switching mode\n");
		374	break;
		375	}
		376
		377	switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) {
		378	case 0x00:
		379	dev_dbg(hub_dev, "global over-current protection\n");
		380	break;
		381	case 0x08:
		382	dev_dbg(hub_dev, "individual port over-current protection\n");
		383	break;
		384	case 0x10:
		385	case 0x18:
		386	dev_dbg(hub_dev, "no over-current protection\n");
		387	break;
		388	}
		389
		390	spin_lock_init (&hub->tt.lock);
		391	INIT_LIST_HEAD (&hub->tt.clear_list);
		392	INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
		393	switch (dev->descriptor.bDeviceProtocol) {
		394	case 0:
		395	break;
		396	case 1:
		397	dev_dbg(hub_dev, "Single TT\n");
		398	hub->tt.hub = dev;
		399	break;
		400	case 2:
		401	dev_dbg(hub_dev, "TT per port\n");
		402	hub->tt.hub = dev;
		403	hub->tt.multi = 1;
		404	break;
		405	default:
		406	dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
		407	dev->descriptor.bDeviceProtocol);
		408	break;
		409	}
		410
		411	switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_TTTT) {
		412	case 0x00:
		413	if (dev->descriptor.bDeviceProtocol != 0)
		414	dev_dbg(hub_dev, "TT requires at most 8 FS bit times\n");
		415	break;
		416	case 0x20:
		417	dev_dbg(hub_dev, "TT requires at most 16 FS bit times\n");
		418	break;
		419	case 0x40:
		420	dev_dbg(hub_dev, "TT requires at most 24 FS bit times\n");
		421	break;
		422	case 0x60:
		423	dev_dbg(hub_dev, "TT requires at most 32 FS bit times\n");
		424	break;
		425	}
		426
		427	dev_dbg(hub_dev, "Port indicators are %s supported\n",
		428	(hub->descriptor->wHubCharacteristics & HUB_CHAR_PORTIND)
		429	? "" : "not");
		430
		431	dev_dbg(hub_dev, "power on to power good time: %dms\n",
		432	hub->descriptor->bPwrOn2PwrGood * 2);
		433	dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
		434	hub->descriptor->bHubContrCurrent);
		435
		436	ret = hub_hub_status(hub, &hubstatus, &hubchange);
		437	if (ret < 0) {
		438	message = "can't get hub status";
		439	goto fail;
		440	}
		441
		442	dev_dbg(hub_dev, "local power source is %s\n",
		443	(hubstatus & HUB_STATUS_LOCAL_POWER)
		444	? "lost (inactive)" : "good");
		445
		446	dev_dbg(hub_dev, "%sover-current condition exists\n",
		447	(hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
		448
		449	/* Start the interrupt endpoint */
		450	pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
		451	maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
		452
		453	if (maxp > sizeof(*hub->buffer))
		454	maxp = sizeof(*hub->buffer);
		455
		456	hub->urb = usb_alloc_urb(0, GFP_KERNEL);
		457	if (!hub->urb) {
		458	message = "couldn't allocate interrupt urb";
		459	ret = -ENOMEM;
		460	goto fail;
		461	}
		462
		463	usb_fill_int_urb(hub->urb, dev, pipe, *hub->buffer, maxp, hub_irq,
		464	hub, endpoint->bInterval);
		465	hub->urb->transfer_dma = hub->buffer_dma;
		466	hub->urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
		467	ret = usb_submit_urb(hub->urb, GFP_KERNEL);
		468	if (ret) {
		469	message = "couldn't submit status urb";
		470	goto fail;
		471	}
		472
		473	/* Wake up khubd */
		474	wake_up(&khubd_wait);
		475
		476	hub_power_on(hub);
		477
		478	return 0;
		479
		480	fail:
		481	dev_err (&hub->intf->dev, "config failed, %s (err %d)\n",
		482	message, ret);
		483	/* hub_disconnect() frees urb and descriptor */
		484	return ret;
		485	}
		486
		487	static void hub_disconnect(struct usb_interface *intf)
		488	{
		489	struct usb_hub *hub = usb_get_intfdata (intf);
		490	unsigned long flags;
		491
		492	if (!hub)
		493	return;
		494
		495	usb_set_intfdata (intf, NULL);
		496	spin_lock_irqsave(&hub_event_lock, flags);
		497
		498	/* Delete it and then reset it */
		499	list_del(&hub->event_list);
		500	INIT_LIST_HEAD(&hub->event_list);
		501	list_del(&hub->hub_list);
		502	INIT_LIST_HEAD(&hub->hub_list);
		503
		504	spin_unlock_irqrestore(&hub_event_lock, flags);
		505
		506	down(&hub->khubd_sem); /* Wait for khubd to leave this hub alone. */
		507	up(&hub->khubd_sem);
		508
		509	/* assuming we used keventd, it must quiesce too */
		510	if (hub->tt.hub)
		511	flush_scheduled_work ();
		512
		513	if (hub->urb) {
		514	usb_unlink_urb(hub->urb);
		515	usb_free_urb(hub->urb);
		516	hub->urb = NULL;
		517	}
		518
		519	if (hub->descriptor) {
		520	kfree(hub->descriptor);
		521	hub->descriptor = NULL;
		522	}
		523
		524	if (hub->status) {
		525	kfree(hub->status);
		526	hub->status = NULL;
		527	}
		528
		529	if (hub->buffer) {
		530	usb_buffer_free(interface_to_usbdev(intf),
		531	sizeof(*hub->buffer), hub->buffer,
		532	hub->buffer_dma);
		533	hub->buffer = NULL;
		534	}
		535
		536	/* Free the memory */
		537	kfree(hub);
		538	}
		539
		540	static int hub_probe(struct usb_interface intf, const struct usb_device_id id)
		541	{
		542	struct usb_host_interface *desc;
		543	struct usb_endpoint_descriptor *endpoint;
		544	struct usb_device *dev;
		545	struct usb_hub *hub;
		546	unsigned long flags;
		547
		548	desc = intf->altsetting + intf->act_altsetting;
		549	dev = interface_to_usbdev(intf);
		550
		551	/* Some hubs have a subclass of 1, which AFAICT according to the */
		552	/* specs is not defined, but it works */
		553	if ((desc->desc.bInterfaceSubClass != 0) &&
		554	(desc->desc.bInterfaceSubClass != 1)) {
		555	descriptor_error:
		556	dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
		557	return -EIO;
		558	}
		559
		560	/* Multiple endpoints? What kind of mutant ninja-hub is this? */
		561	if (desc->desc.bNumEndpoints != 1) {
		562	goto descriptor_error;
		563	}
		564
		565	endpoint = &desc->endpoint[0].desc;
		566
		567	/* Output endpoint? Curiouser and curiouser.. */
		568	if (!(endpoint->bEndpointAddress & USB_DIR_IN)) {
		569	goto descriptor_error;
		570	}
		571
		572	/* If it's not an interrupt endpoint, we'd better punt! */
		573	if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
		574	!= USB_ENDPOINT_XFER_INT) {
		575	goto descriptor_error;
		576	return -EIO;
		577	}
		578
		579	/* We found a hub */
		580	dev_info (hubdev (dev), "USB hub found\n");
		581
		582	hub = kmalloc(sizeof(*hub), GFP_KERNEL);
		583	if (!hub) {
		584	err("couldn't kmalloc hub struct");
		585	return -ENOMEM;
		586	}
		587
		588	memset(hub, 0, sizeof(*hub));
		589
		590	INIT_LIST_HEAD(&hub->event_list);
		591	hub->intf = intf;
		592	init_MUTEX(&hub->khubd_sem);
		593
		594	/* Record the new hub's existence */
		595	spin_lock_irqsave(&hub_event_lock, flags);
		596	INIT_LIST_HEAD(&hub->hub_list);
		597	list_add(&hub->hub_list, &hub_list);
		598	spin_unlock_irqrestore(&hub_event_lock, flags);
		599
		600	usb_set_intfdata (intf, hub);
		601
		602	if (hub_configure(hub, endpoint) >= 0)
		603	return 0;
		604
		605	hub_disconnect (intf);
		606	return -ENODEV;
		607	}
		608
		609	static int
		610	hub_ioctl(struct usb_interface intf, unsigned int code, void user_data)
		611	{
		612	struct usb_device *hub = interface_to_usbdev (intf);
		613
		614	/* assert ifno == 0 (part of hub spec) */
		615	switch (code) {
		616	case USBDEVFS_HUB_PORTINFO: {
		617	struct usbdevfs_hub_portinfo *info = user_data;
		618	unsigned long flags;
		619	int i;
		620
		621	spin_lock_irqsave(&hub_event_lock, flags);
		622	if (hub->devnum <= 0)
		623	info->nports = 0;
		624	else {
		625	info->nports = hub->maxchild;
		626	for (i = 0; i < info->nports; i++) {
		627	if (hub->children[i] == NULL)
		628	info->port[i] = 0;
		629	else
		630	info->port[i] =
		631	hub->children[i]->devnum;
		632	}
		633	}
		634	spin_unlock_irqrestore(&hub_event_lock, flags);
		635
		636	return info->nports + 1;
		637	}
		638
		639	default:
		640	return -ENOSYS;
		641	}
		642	}
		643
		644	static int hub_reset(struct usb_hub *hub)
		645	{
		646	struct usb_device *dev = interface_to_usbdev(hub->intf);
		647	int i;
		648
		649	/* Disconnect any attached devices */
		650	for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
		651	if (dev->children[i])
		652	usb_disconnect(&dev->children[i]);
		653	}
		654
		655	/* Attempt to reset the hub */
		656	if (hub->urb)
		657	usb_unlink_urb(hub->urb);
		658	else
		659	return -1;
		660
		661	if (usb_reset_device(dev))
		662	return -1;
		663
		664	hub->urb->dev = dev;
		665	if (usb_submit_urb(hub->urb, GFP_KERNEL))
		666	return -1;
		667
		668	hub_power_on(hub);
		669
		670	return 0;
		671	}
		672
		673	static void hub_start_disconnect(struct usb_device *dev)
		674	{
		675	struct usb_device *parent = dev->parent;
		676	int i;
		677
		678	/* Find the device pointer to disconnect */
		679	if (parent) {
		680	for (i = 0; i < parent->maxchild; i++) {
		681	if (parent->children[i] == dev) {
		682	usb_disconnect(&parent->children[i]);
		683	return;
		684	}
		685	}
		686	}
		687
		688	err("cannot disconnect hub %s", dev->devpath);
		689	}
		690
		691	static int hub_port_status(struct usb_device *dev, int port,
		692	u16 status, u16 change)
		693	{
		694	struct usb_hub *hub = usb_get_intfdata(dev->actconfig->interface[0]);
		695	int ret;
		696
		697	if (!hub)
		698	return -ENODEV;
		699
		700	ret = get_port_status(dev, port + 1, &hub->status->port);
		701	if (ret < 0)
		702	dev_err (hubdev (dev),
		703	"%s failed (err = %d)\n", __FUNCTION__, ret);
		704	else {
		705	*status = le16_to_cpu(hub->status->port.wPortStatus);
		706	*change = le16_to_cpu(hub->status->port.wPortChange);
		707	ret = 0;
		708	}
		709	return ret;
		710	}
		711
		712	#define HUB_RESET_TRIES 5
		713	#define HUB_PROBE_TRIES 2
		714	#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
		715	#define HUB_SHORT_RESET_TIME 10
		716	#define HUB_LONG_RESET_TIME 200
		717	#define HUB_RESET_TIMEOUT 500
		718
		719	/* return: -1 on error, 0 on success, 1 on disconnect. */
		720	static int hub_port_wait_reset(struct usb_device *hub, int port,
		721	struct usb_device *dev, unsigned int delay)
		722	{
		723	int delay_time, ret;
		724	u16 portstatus;
		725	u16 portchange;
		726
		727	for (delay_time = 0;
		728	delay_time < HUB_RESET_TIMEOUT;
		729	delay_time += delay) {
		730	/* wait to give the device a chance to reset */
		731	wait_ms(delay);
		732
		733	/* read and decode port status */
		734	ret = hub_port_status(hub, port, &portstatus, &portchange);
		735	if (ret < 0) {
		736	return -1;
		737	}
		738
		739	/* Device went away? */
		740	if (!(portstatus & USB_PORT_STAT_CONNECTION))
		741	return 1;
		742
		743	/* bomb out completely if something weird happened */
		744	if ((portchange & USB_PORT_STAT_C_CONNECTION))
		745	return -1;
		746
		747	/* if we`ve finished resetting, then break out of the loop */
		748	if (!(portstatus & USB_PORT_STAT_RESET) &&
		749	(portstatus & USB_PORT_STAT_ENABLE)) {
		750	if (portstatus & USB_PORT_STAT_HIGH_SPEED)
		751	dev->speed = USB_SPEED_HIGH;
		752	else if (portstatus & USB_PORT_STAT_LOW_SPEED)
		753	dev->speed = USB_SPEED_LOW;
		754	else
		755	dev->speed = USB_SPEED_FULL;
		756	return 0;
		757	}
		758
		759	/* switch to the long delay after two short delay failures */
		760	if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
		761	delay = HUB_LONG_RESET_TIME;
		762
		763	dev_dbg (hubdev (hub),
		764	"port %d not reset yet, waiting %dms\n",
		765	port + 1, delay);
		766	}
		767
		768	return -1;
		769	}
		770
		771	/* return: -1 on error, 0 on success, 1 on disconnect. */
		772	static int hub_port_reset(struct usb_device *hub, int port,
		773	struct usb_device *dev, unsigned int delay)
		774	{
		775	int i, status;
		776
		777	/* Reset the port */
		778	for (i = 0; i < HUB_RESET_TRIES; i++) {
		779	set_port_feature(hub, port + 1, USB_PORT_FEAT_RESET);
		780
		781	/* return on disconnect or reset */
		782	status = hub_port_wait_reset(hub, port, dev, delay);
		783	if (status != -1) {
		784	clear_port_feature(hub,
		785	port + 1, USB_PORT_FEAT_C_RESET);
		786	dev->state = status
		787	? USB_STATE_NOTATTACHED
		788	: USB_STATE_DEFAULT;
		789	return status;
		790	}
		791
		792	dev_dbg (hubdev (hub),
		793	"port %d not enabled, trying reset again...\n",
		794	port + 1);
		795	delay = HUB_LONG_RESET_TIME;
		796	}
		797
		798	dev_err (hubdev (hub),
		799	"Cannot enable port %i. Maybe the USB cable is bad?\n",
		800	port + 1);
		801
		802	return -1;
		803	}
		804
		805	int hub_port_disable(struct usb_device *hub, int port)
		806	{
		807	int ret;
		808
		809	ret = clear_port_feature(hub, port + 1, USB_PORT_FEAT_ENABLE);
		810	if (ret)
		811	dev_err(hubdev(hub), "cannot disable port %d (err = %d)\n",
		812	port + 1, ret);
		813
		814	return ret;
		815	}
		816
		817	/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
		818	*
		819	* Between connect detection and reset signaling there must be a delay
		820	* of 100ms at least for debounce and power-settling. The corresponding
		821	* timer shall restart whenever the downstream port detects a disconnect.
		822	*
		823	* Apparently there are some bluetooth and irda-dongles and a number
		824	* of low-speed devices which require longer delays of about 200-400ms.
		825	* Not covered by the spec - but easy to deal with.
		826	*
		827	* This implementation uses 400ms minimum debounce timeout and checks
		828	* every 25ms for transient disconnects to restart the delay.
		829	*/
		830
		831	#define HUB_DEBOUNCE_TIMEOUT 400
		832	#define HUB_DEBOUNCE_STEP 25
		833	#define HUB_DEBOUNCE_STABLE 4
		834
		835	/* return: -1 on error, 0 on success, 1 on disconnect. */
		836	static int hub_port_debounce(struct usb_device *hub, int port)
		837	{
		838	int ret;
		839	int delay_time, stable_count;
		840	u16 portchange, portstatus;
		841	unsigned connection;
		842
		843	connection = 0;
		844	stable_count = 0;
		845	for (delay_time = 0; delay_time < HUB_DEBOUNCE_TIMEOUT; delay_time += HUB_DEBOUNCE_STEP) {
		846	wait_ms(HUB_DEBOUNCE_STEP);
		847
		848	ret = hub_port_status(hub, port, &portstatus, &portchange);
		849	if (ret < 0)
		850	return -1;
		851
		852	if ((portstatus & USB_PORT_STAT_CONNECTION) == connection) {
		853	if (connection) {
		854	if (++stable_count == HUB_DEBOUNCE_STABLE)
		855	break;
		856	}
		857	} else {
		858	stable_count = 0;
		859	}
		860	connection = portstatus & USB_PORT_STAT_CONNECTION;
		861
		862	if ((portchange & USB_PORT_STAT_C_CONNECTION)) {
		863	clear_port_feature(hub, port+1, USB_PORT_FEAT_C_CONNECTION);
		864	}
		865	}
		866
		867	dev_dbg (hubdev (hub),
		868	"debounce: port %d: delay %dms stable %d status 0x%x\n",
		869	port + 1, delay_time, stable_count, portstatus);
		870
		871	return ((portstatus&USB_PORT_STAT_CONNECTION)) ? 0 : 1;
		872	}
		873
		874	static void hub_port_connect_change(struct usb_hub *hubstate, int port,
		875	u16 portstatus, u16 portchange)
		876	{
		877	struct usb_device *hub = interface_to_usbdev(hubstate->intf);
		878	struct usb_device *dev;
		879	unsigned int delay = HUB_SHORT_RESET_TIME;
		880	int i;
		881
		882	dev_dbg (&hubstate->intf->dev,
		883	"port %d, status %x, change %x, %s\n",
		884	port + 1, portstatus, portchange, portspeed (portstatus));
		885
		886	/* Clear the connection change status */
		887	clear_port_feature(hub, port + 1, USB_PORT_FEAT_C_CONNECTION);
		888
		889	/* Disconnect any existing devices under this port */
		890	if (hub->children[port])
		891	usb_disconnect(&hub->children[port]);
		892
		893	/* Return now if nothing is connected */
		894	if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
		895	if (portstatus & USB_PORT_STAT_ENABLE)
		896	hub_port_disable(hub, port);
		897
		898	return;
		899	}
		900
		901	if (hub_port_debounce(hub, port)) {
		902	dev_err (&hubstate->intf->dev,
		903	"connect-debounce failed, port %d disabled\n",
		904	port+1);
		905	hub_port_disable(hub, port);
		906	return;
		907	}
		908
		909	/* root hub ports have a slightly longer reset period
		910	* (from USB 2.0 spec, section 7.1.7.5)
		911	*/
		912	if (!hub->parent)
		913	delay = HUB_ROOT_RESET_TIME;
		914
		915	/* Some low speed devices have problems with the quick delay, so */
		916	/* be a bit pessimistic with those devices. RHbug #23670 */
		917	if (portstatus & USB_PORT_STAT_LOW_SPEED)
		918	delay = HUB_LONG_RESET_TIME;
		919
		920	down(&usb_address0_sem);
		921
		922	for (i = 0; i < HUB_PROBE_TRIES; i++) {
		923	struct usb_device *pdev;
		924	int len;
		925
		926	/* Allocate a new device struct */
		927	dev = usb_alloc_dev(hub, hub->bus);
		928	if (!dev) {
		929	dev_err (&hubstate->intf->dev,
		930	"couldn't allocate usb_device\n");
		931	break;
		932	}
		933
		934	dev->state = USB_STATE_POWERED;
		935
		936	/* Reset the device, and detect its speed */
		937	if (hub_port_reset(hub, port, dev, delay)) {
		938	usb_put_dev(dev);
		939	break;
		940	}
		941
		942	/* Find a new address for it */
		943	usb_choose_address(dev);
		944
		945	/* Set up TT records, if needed */
		946	if (hub->tt) {
		947	dev->tt = hub->tt;
		948	dev->ttport = hub->ttport;
		949	} else if (dev->speed != USB_SPEED_HIGH
		950	&& hub->speed == USB_SPEED_HIGH) {
		951	dev->tt = &hubstate->tt;
		952	dev->ttport = port + 1;
		953	}
		954
		955	/* Save readable and stable topology id, distinguishing
		956	* devices by location for diagnostics, tools, etc. The
		957	* string is a path along hub ports, from the root. Each
		958	* device's id will be stable until USB is re-cabled, and
		959	* hubs are often labeled with these port numbers.
		960	*
		961	* Initial size: ".NN" times five hubs + NUL = 16 bytes max
		962	* (quite rare, since most hubs have 4-6 ports).
		963	*/
		964	pdev = dev->parent;
		965	if (pdev->devpath [0] != '0') /* parent not root? */
		966	len = snprintf26(dev->devpath, sizeof dev->devpath,
		967	"%s.%d", pdev->devpath, port + 1);
		968	/* root == "0", root port 2 == "2", port 3 that hub "2.3" */
		969	else
		970	len = snprintf26(dev->devpath, sizeof dev->devpath,
		971	"%d", port + 1);
		972	if (len == sizeof dev->devpath)
		973	dev_err (&hubstate->intf->dev,
		974	"devpath size! usb/%03d/%03d path %s\n",
		975	dev->bus->busnum, dev->devnum, dev->devpath);
		976	dev_info (&hubstate->intf->dev,
		977	"new USB device on port %d, assigned address %d\n",
		978	port + 1, dev->devnum);
		979
		980	/* put the device in the global device tree. the hub port
		981	* is the "bus_id"; hubs show in hierarchy like bridges
		982	*/
		983	dev->dev.parent = dev->parent->dev.parent->parent;
		984
		985	/* Run it through the hoops (find a driver, etc) */
		986	if (!usb_new_device(dev, &hub->dev)) {
		987	hub->children[port] = dev;
		988	goto done;
		989	}
		990
		991	/* Free the configuration if there was an error */
		992	usb_put_dev(dev);
		993
		994	/* Switch to a long reset time */
		995	delay = HUB_LONG_RESET_TIME;
		996	}
		997
		998	hub_port_disable(hub, port);
		999	done:
		1000	up(&usb_address0_sem);
		1001	}
		1002
		1003	static void hub_events(void)
		1004	{
		1005	unsigned long flags;
		1006	struct list_head *tmp;
		1007	struct usb_device *dev;
		1008	struct usb_hub *hub;
		1009	u16 hubstatus;
		1010	u16 hubchange;
		1011	u16 portstatus;
		1012	u16 portchange;
		1013	int i, ret;
		1014
		1015	/*
		1016	* We restart the list every time to avoid a deadlock with
		1017	* deleting hubs downstream from this one. This should be
		1018	* safe since we delete the hub from the event list.
		1019	* Not the most efficient, but avoids deadlocks.
		1020	*/
		1021
		1022	while (1) {
		1023	spin_lock_irqsave(&hub_event_lock, flags);
		1024
		1025	if (list_empty(&hub_event_list))
		1026	break;
		1027
		1028	/* Grab the next entry from the beginning of the list */
		1029	tmp = hub_event_list.next;
		1030
		1031	hub = list_entry(tmp, struct usb_hub, event_list);
		1032	dev = interface_to_usbdev(hub->intf);
		1033
		1034	list_del_init(tmp);
		1035
		1036	//** if (unlikely(down_trylock(&hub->khubd_sem)))
		1037	//** BUG(); /* never blocks, we were on list */
		1038
		1039	spin_unlock_irqrestore(&hub_event_lock, flags);
		1040
		1041	if (hub->error) {
		1042	dev_dbg (&hub->intf->dev, "resetting for error %d\n",
		1043	hub->error);
		1044
		1045	if (hub_reset(hub)) {
		1046	dev_dbg (&hub->intf->dev,
		1047	"can't reset; disconnecting\n");
		1048	up(&hub->khubd_sem);
		1049	hub_start_disconnect(dev);
		1050	continue;
		1051	}
		1052
		1053	hub->nerrors = 0;
		1054	hub->error = 0;
		1055	}
		1056
		1057	for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
		1058	ret = hub_port_status(dev, i, &portstatus, &portchange);
		1059	if (ret < 0) {
		1060	continue;
		1061	}
		1062
		1063	if (portchange & USB_PORT_STAT_C_CONNECTION) {
		1064	hub_port_connect_change(hub, i, portstatus, portchange);
		1065	} else if (portchange & USB_PORT_STAT_C_ENABLE) {
		1066	dev_dbg (hubdev (dev),
		1067	"port %d enable change, status %x\n",
		1068	i + 1, portstatus);
		1069	clear_port_feature(dev,
		1070	i + 1, USB_PORT_FEAT_C_ENABLE);
		1071
		1072	/*
		1073	* EM interference sometimes causes badly
		1074	* shielded USB devices to be shutdown by
		1075	* the hub, this hack enables them again.
		1076	* Works at least with mouse driver.
		1077	*/
		1078	if (!(portstatus & USB_PORT_STAT_ENABLE)
		1079	&& (portstatus & USB_PORT_STAT_CONNECTION)
		1080	&& (dev->children[i])) {
		1081	dev_err (&hub->intf->dev,
		1082	"port %i "
		1083	"disabled by hub (EMI?), "
		1084	"re-enabling...",
		1085	i + 1);
		1086	hub_port_connect_change(hub,
		1087	i, portstatus, portchange);
		1088	}
		1089	}
		1090
		1091	if (portchange & USB_PORT_STAT_C_SUSPEND) {
		1092	dev_dbg (&hub->intf->dev,
		1093	"suspend change on port %d\n",
		1094	i + 1);
		1095	clear_port_feature(dev,
		1096	i + 1, USB_PORT_FEAT_C_SUSPEND);
		1097	}
		1098
		1099	if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
		1100	dev_err (&hub->intf->dev,
		1101	"over-current change on port %d\n",
		1102	i + 1);
		1103	clear_port_feature(dev,
		1104	i + 1, USB_PORT_FEAT_C_OVER_CURRENT);
		1105	hub_power_on(hub);
		1106	}
		1107
		1108	if (portchange & USB_PORT_STAT_C_RESET) {
		1109	dev_dbg (&hub->intf->dev,
		1110	"reset change on port %d\n",
		1111	i + 1);
		1112	clear_port_feature(dev,
		1113	i + 1, USB_PORT_FEAT_C_RESET);
		1114	}
		1115	} /* end for i */
		1116
		1117	/* deal with hub status changes */
		1118	if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
		1119	dev_err (&hub->intf->dev, "get_hub_status failed\n");
		1120	else {
		1121	if (hubchange & HUB_CHANGE_LOCAL_POWER) {
		1122	dev_dbg (&hub->intf->dev, "power change\n");
		1123	clear_hub_feature(dev, C_HUB_LOCAL_POWER);
		1124	}
		1125	if (hubchange & HUB_CHANGE_OVERCURRENT) {
		1126	dev_dbg (&hub->intf->dev, "overcurrent change\n");
		1127	wait_ms(500); /* Cool down */
		1128	clear_hub_feature(dev, C_HUB_OVER_CURRENT);
		1129	hub_power_on(hub);
		1130	}
		1131	}
		1132	up(&hub->khubd_sem);
		1133	} /* end while (1) */
		1134
		1135	spin_unlock_irqrestore(&hub_event_lock, flags);
		1136	}
		1137
		1138	static int hub_thread(void *__hub)
		1139	{
		1140	/*
		1141	* This thread doesn't need any user-level access,
		1142	* so get rid of all our resources
		1143	*/
		1144
		1145	daemonize("khubd");
		1146	allow_signal(SIGKILL);
		1147
		1148	/* Send me a signal to get me die (for debugging) */
		1149	do {
		1150	hub_events();
		1151	wait_event_interruptible(khubd_wait, !list_empty(&hub_event_list));
		1152	// if (current->flags & PF_FREEZE)
		1153	// refrigerator(PF_IOTHREAD);
		1154	} while (!signal_pending(current));
		1155	printk(KERN_DEBUG "File: %s @hub_thread_exit\n", __FILE__);
		1156
		1157	dbg("hub_thread exiting");
		1158	complete_and_exit(&khubd_exited, 0);
		1159	return 0;
		1160	}
		1161
		1162	static struct usb_device_id hub_id_table [] = {
		1163	{ .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
		1164	.bDeviceClass = USB_CLASS_HUB},
		1165	{ .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
		1166	.bInterfaceClass = USB_CLASS_HUB},
		1167	{ } /* Terminating entry */
		1168	};
		1169
		1170	MODULE_DEVICE_TABLE (usb, hub_id_table);
		1171
		1172	static struct usb_driver hub_driver = {
		1173	.owner = THIS_MODULE,
		1174	.name = "hub",
		1175	.probe = hub_probe,
		1176	.disconnect = hub_disconnect,
		1177	.ioctl = hub_ioctl,
		1178	.id_table = hub_id_table,
		1179	};
		1180
		1181	/*
		1182	* This should be a separate module.
		1183	*/
		1184	int usb_hub_init(void)
		1185	{
		1186	pid_t pid;
		1187
		1188	if (usb_register(&hub_driver) < 0) {
		1189	err("Unable to register USB hub driver");
		1190	return -1;
		1191	}
		1192
		1193	pid = kernel_thread(hub_thread, NULL, CLONE_KERNEL);
		1194	if (pid >= 0) {
		1195	khubd_pid = pid;
		1196
		1197	return 0;
		1198	}
		1199
		1200	/* Fall through if kernel_thread failed */
		1201	usb_deregister(&hub_driver);
		1202	err("failed to start hub_thread");
		1203
		1204	return -1;
		1205	}
		1206
		1207	void usb_hub_cleanup(void)
		1208	{
		1209	int ret;
		1210
		1211	/* Kill the thread */
		1212	ret = kill_proc(khubd_pid, SIGKILL, 1);
		1213
		1214	wait_for_completion(&khubd_exited);
		1215
		1216	/*
		1217	* Hub resources are freed for us by usb_deregister. It calls
		1218	* usb_driver_purge on every device which in turn calls that
		1219	* devices disconnect function if it is using this driver.
		1220	* The hub_disconnect function takes care of releasing the
		1221	* individual hub resources. -greg
		1222	*/
		1223	usb_deregister(&hub_driver);
		1224	} /* usb_hub_cleanup() */
		1225
		1226	/*
		1227	* WARNING - If a driver calls usb_reset_device, you should simulate a
		1228	* disconnect() and probe() for other interfaces you doesn't claim. This
		1229	* is left up to the driver writer right now. This insures other drivers
		1230	* have a chance to re-setup their interface.
		1231	*
		1232	* Take a look at proc_resetdevice in devio.c for some sample code to
		1233	* do this.
		1234	* Use this only from within your probe function, otherwise use
		1235	* usb_reset_device() below, which ensure proper locking
		1236	*/
		1237	int usb_physical_reset_device(struct usb_device *dev)
		1238	{
		1239	struct usb_device *parent = dev->parent;
		1240	struct usb_device_descriptor *descriptor;
		1241	int i, ret, port = -1;
		1242
		1243	if (!parent) {
		1244	err("attempting to reset root hub!");
		1245	return -EINVAL;
		1246	}
		1247
		1248	for (i = 0; i < parent->maxchild; i++)
		1249	if (parent->children[i] == dev) {
		1250	port = i;
		1251	break;
		1252	}
		1253
		1254	if (port < 0)
		1255	return -ENOENT;
		1256
		1257	descriptor = kmalloc(sizeof *descriptor, GFP_NOIO);
		1258	if (!descriptor) {
		1259	return -ENOMEM;
		1260	}
		1261
		1262	down(&usb_address0_sem);
		1263
		1264	/* Send a reset to the device */
		1265	if (hub_port_reset(parent, port, dev, HUB_SHORT_RESET_TIME)) {
		1266	hub_port_disable(parent, port);
		1267	up(&usb_address0_sem);
		1268	kfree(descriptor);
		1269	return(-ENODEV);
		1270	}
		1271
		1272	/* Reprogram the Address */
		1273	ret = usb_set_address(dev);
		1274	if (ret < 0) {
		1275	err("USB device not accepting new address (error=%d)", ret);
		1276	hub_port_disable(parent, port);
		1277	up(&usb_address0_sem);
		1278	kfree(descriptor);
		1279	return ret;
		1280	}
		1281
		1282	/* Let the SET_ADDRESS settle */
		1283	wait_ms(10);
		1284
		1285	up(&usb_address0_sem);
		1286
		1287	/*
		1288	* Now we fetch the configuration descriptors for the device and
		1289	* see if anything has changed. If it has, we dump the current
		1290	* parsed descriptors and reparse from scratch. Then we leave
		1291	* the device alone for the caller to finish setting up.
		1292	*
		1293	* If nothing changed, we reprogram the configuration and then
		1294	* the alternate settings.
		1295	*/
		1296
		1297	ret = usb_get_descriptor(dev, USB_DT_DEVICE, 0, descriptor,
		1298	sizeof(*descriptor));
		1299	if (ret < 0) {
		1300	kfree(descriptor);
		1301	return ret;
		1302	}
		1303
		1304	le16_to_cpus(&descriptor->bcdUSB);
		1305	le16_to_cpus(&descriptor->idVendor);
		1306	le16_to_cpus(&descriptor->idProduct);
		1307	le16_to_cpus(&descriptor->bcdDevice);
		1308
		1309	if (memcmp(&dev->descriptor, descriptor, sizeof(*descriptor))) {
		1310	kfree(descriptor);
		1311	usb_destroy_configuration(dev);
		1312
		1313	ret = usb_get_device_descriptor(dev);
		1314	if (ret < sizeof(dev->descriptor)) {
		1315	if (ret < 0)
		1316	err("unable to get device %s descriptor "
		1317	"(error=%d)", dev->devpath, ret);
		1318	else
		1319	err("USB device %s descriptor short read "
		1320	"(expected %Zi, got %i)",
		1321	dev->devpath,
		1322	sizeof(dev->descriptor), ret);
		1323
		1324	clear_bit(dev->devnum, dev->bus->devmap.devicemap);
		1325	dev->devnum = -1;
		1326	return -EIO;
		1327	}
		1328
		1329	ret = usb_get_configuration(dev);
		1330	if (ret < 0) {
		1331	err("unable to get configuration (error=%d)", ret);
		1332	usb_destroy_configuration(dev);
		1333	clear_bit(dev->devnum, dev->bus->devmap.devicemap);
		1334	dev->devnum = -1;
		1335	return 1;
		1336	}
		1337
		1338	usb_set_configuration(dev, dev->config[0].desc.bConfigurationValue);
		1339	return 1;
		1340	}
		1341
		1342	kfree(descriptor);
		1343
		1344	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		1345	USB_REQ_SET_CONFIGURATION, 0,
		1346	dev->actconfig->desc.bConfigurationValue, 0,
		1347	NULL, 0, HZ * USB_CTRL_SET_TIMEOUT);
		1348	if (ret < 0) {
		1349	err("failed to set dev %s active configuration (error=%d)",
		1350	dev->devpath, ret);
		1351	return ret;
		1352	}
		1353	dev->state = USB_STATE_CONFIGURED;
		1354
		1355	for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
		1356	struct usb_interface *intf = dev->actconfig->interface[i];
		1357	struct usb_interface_descriptor *as;
		1358
		1359	as = &intf->altsetting[intf->act_altsetting].desc;
		1360	ret = usb_set_interface(dev, as->bInterfaceNumber,
		1361	as->bAlternateSetting);
		1362	if (ret < 0) {
		1363	err("failed to set active alternate setting "
		1364	"for dev %s interface %d (error=%d)",
		1365	dev->devpath, i, ret);
		1366	return ret;
		1367	}
		1368	}
		1369
		1370	return 0;
		1371	}
		1372
		1373	int usb_reset_device(struct usb_device *udev)
		1374	{
		1375	struct device *gdev = &udev->dev;
		1376	int r;
		1377
		1378	// down_read(&gdev->bus->subsys.rwsem);
		1379	r = usb_physical_reset_device(udev);
		1380	// up_read(&gdev->bus->subsys.rwsem);
		1381
		1382	return r;
		1383	}

Subversion Repositories shark

(root)/shark/trunk/drivers/usb/core/hub.c @ 1063 - Rev 846