hub.c

winNT技术操作系统,国外开放的原代码和LIUX一样

/*
 * USB hub driver.
 *
 * (C) Copyright 1999 Linus Torvalds
 * (C) Copyright 1999 Johannes Erdfelt
 * (C) Copyright 1999 Gregory P. Smith
 * (C) Copyright 2001 Brad Hards ([e-mail])
 *
 */
#if 0
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/completion.h>
#include <linux/sched.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/ioctl.h>
#ifdef CONFIG_USB_DEBUG
	#define DEBUG
#else
	#undef DEBUG
#endif
#include <linux/usb.h>
#include <linux/usbdevice_fs.h>
#include <linux/suspend.h>

#include <asm/semaphore.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>

#include "hcd.h"
#include "hub.h"

#else

#include "../miniport/usb_wrapper.h"
#include "hcd.h"
#include "hub.h"

#endif

/* Wakes up khubd */
static spinlock_t hub_event_lock;
//static DECLARE_MUTEX(usb_address0_sem);

static LIST_HEAD(hub_event_list);	/* List of hubs needing servicing */
static LIST_HEAD(hub_list);		/* List of all hubs (for cleanup) */

static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
static pid_t khubd_pid = 0;			/* PID of khubd */
static DECLARE_COMPLETION(khubd_exited);

#ifdef	DEBUG
static inline char *portspeed (int portstatus)
{
	if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
    		return "480 Mb/s";
	else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
		return "1.5 Mb/s";
	else
		return "12 Mb/s";
}
#endif

/* for dev_info, dev_dbg, etc */
static inline struct device *hubdev (struct usb_device *dev)
{
	return &dev->actconfig->interface [0].dev;
}

/* USB 2.0 spec Section 11.24.4.5 */
static int get_hub_descriptor(struct usb_device *dev, void *data, int size)
{
	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
		USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
		USB_DT_HUB << 8, 0, data, size, HZ * USB_CTRL_GET_TIMEOUT);
}

/*
 * USB 2.0 spec Section 11.24.2.1
 */
static int clear_hub_feature(struct usb_device *dev, int feature)
{
	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, HZ);
}

/*
 * USB 2.0 spec Section 11.24.2.2
 * BUG: doesn't handle port indicator selector in high byte of wIndex
 */
static int clear_port_feature(struct usb_device *dev, int port, int feature)
{
	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port, NULL, 0, HZ);
}

/*
 * USB 2.0 spec Section 11.24.2.13
 * BUG: doesn't handle port indicator selector in high byte of wIndex
 */
static int set_port_feature(struct usb_device *dev, int port, int feature)
{
	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port, NULL, 0, HZ);
}

/*
 * USB 2.0 spec Section 11.24.2.6
 */
static int get_hub_status(struct usb_device *dev,
		struct usb_hub_status *data)
{
	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
		USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
		data, sizeof(*data), HZ * USB_CTRL_GET_TIMEOUT);
}

/*
 * USB 2.0 spec Section 11.24.2.7
 */
static int get_port_status(struct usb_device *dev, int port,
		struct usb_port_status *data)
{
	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
		USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
		data, sizeof(*data), HZ * USB_CTRL_GET_TIMEOUT);
}

/* completion function, fires on port status changes and various faults */
static void hub_irq(struct urb *urb, struct pt_regs *regs)
{
	struct usb_hub *hub = (struct usb_hub *)urb->context;
	unsigned long flags;
	int status;

	switch (urb->status) {
	case -ENOENT:		/* synchronous unlink */
	case -ECONNRESET:	/* async unlink */
	case -ESHUTDOWN:	/* hardware going away */
		return;
	case -EOVERFLOW:
		if (hub->RestCounter>0) {
		// we already resetted one time ...
			hub->error = 0;
			hub->nerrors = 0;		
			break;
		}
		hub->RestCounter++;
		
	default:		/* presumably an error */
		/* Cause a hub reset after 10 consecutive errors */
		printk("hub_irq got ...: error %d URB: %d",hub->error,urb->status);
		
		dev_dbg (&hub->intf->dev, "transfer --> %d\n", urb->status);
		if ((++hub->nerrors < 10) || hub->error)
			goto resubmit;
		hub->error = urb->status;

		/* FALL THROUGH */
	
	/* let khubd handle things */
	case 0:			/* we got data:  port status changed */
		break;
	}


	hub->nerrors = 0;

	/* Something happened, let khubd figure it out */
	spin_lock_irqsave(&hub_event_lock, flags);
	if (list_empty(&hub->event_list)) {
		list_add(&hub->event_list, &hub_event_list);
		wake_up(&khubd_wait);
	}
	spin_unlock_irqrestore(&hub_event_lock, flags);

resubmit:
	if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
			/* ENODEV means we raced disconnect() */
			&& status != -ENODEV)
		dev_err (&hub->intf->dev, "resubmit --> %d\n", urb->status);
}

/* USB 2.0 spec Section 11.24.2.3 */
static inline int
hub_clear_tt_buffer (struct usb_device *hub, u16 devinfo, u16 tt)
{
	return usb_control_msg (hub, usb_rcvctrlpipe (hub, 0),
		HUB_CLEAR_TT_BUFFER, USB_DIR_IN | USB_RECIP_OTHER,
		devinfo, tt, 0, 0, HZ);
}

/*
 * enumeration blocks khubd for a long time. we use keventd instead, since
 * long blocking there is the exception, not the rule.  accordingly, HCDs
 * talking to TTs must queue control transfers (not just bulk and iso), so
 * both can talk to the same hub concurrently.
 */
static void hub_tt_kevent (void *arg)
{
	struct usb_hub		*hub = arg;
	unsigned long		flags;

	spin_lock_irqsave (&hub->tt.lock, flags);
	while (!list_empty (&hub->tt.clear_list)) {
		struct list_head	*temp;
		struct usb_tt_clear	*clear;
		struct usb_device	*dev;
		int			status;

		temp = hub->tt.clear_list.next;
		clear = list_entry (temp, struct usb_tt_clear, clear_list);
		list_del (&clear->clear_list);

		/* drop lock so HCD can concurrently report other TT errors */
		spin_unlock_irqrestore (&hub->tt.lock, flags);
		dev = interface_to_usbdev (hub->intf);
		status = hub_clear_tt_buffer (dev, clear->devinfo, clear->tt);
		spin_lock_irqsave (&hub->tt.lock, flags);

		if (status)
			err ("usb-%s-%s clear tt %d (%04x) error %d",
				dev->bus->bus_name, dev->devpath,
				clear->tt, clear->devinfo, status);
		kfree (clear);
	}
	spin_unlock_irqrestore (&hub->tt.lock, flags);
}

/**
 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
 * @dev: the device whose split transaction failed
 * @pipe: identifies the endpoint of the failed transaction
 *
 * High speed HCDs use this to tell the hub driver that some split control or
 * bulk transaction failed in a way that requires clearing internal state of
 * a transaction translator.  This is normally detected (and reported) from
 * interrupt context.
 *
 * It may not be possible for that hub to handle additional full (or low)
 * speed transactions until that state is fully cleared out.
 */
void usb_hub_tt_clear_buffer (struct usb_device *dev, int pipe)
{
	struct usb_tt		*tt = dev->tt;
	unsigned long		flags;
	struct usb_tt_clear	*clear;

	/* we've got to cope with an arbitrary number of pending TT clears,
	 * since each TT has "at least two" buffers that can need it (and
	 * there can be many TTs per hub).  even if they're uncommon.
	 */
	if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == 0) {
		err ("can't save CLEAR_TT_BUFFER state for hub at usb-%s-%s",
			dev->bus->bus_name, tt->hub->devpath);
		/* FIXME recover somehow ... RESET_TT? */
		return;
	}

	/* info that CLEAR_TT_BUFFER needs */
	clear->tt = tt->multi ? dev->ttport : 1;
	clear->devinfo = usb_pipeendpoint (pipe);
	clear->devinfo |= dev->devnum << 4;
	clear->devinfo |= usb_pipecontrol (pipe)
			? (USB_ENDPOINT_XFER_CONTROL << 11)
			: (USB_ENDPOINT_XFER_BULK << 11);
	if (usb_pipein (pipe))
		clear->devinfo |= 1 << 15;
	
	/* tell keventd to clear state for this TT */
	spin_lock_irqsave (&tt->lock, flags);
	list_add_tail (&clear->clear_list, &tt->clear_list);
	schedule_work (&tt->kevent);
	spin_unlock_irqrestore (&tt->lock, flags);
}

static void hub_power_on(struct usb_hub *hub)
{
	struct usb_device *dev;
	int i;
	int DelayPerPort;
	int DelayAfterPort;
	
	DelayAfterPort = hub->descriptor->bPwrOn2PwrGood * 2;
	DelayPerPort = 0;
	
	switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) {
		case 0x00:
			DelayAfterPort = hub->descriptor->bPwrOn2PwrGood * 2;
			DelayPerPort = 0;
			break;
		case 0x01:
			DelayAfterPort = hub->descriptor->bPwrOn2PwrGood;
			DelayPerPort = hub->descriptor->bPwrOn2PwrGood /4;
			break;
		case 0x02:
		case 0x03:
			//dev_dbg(hub_dev, "unknown reserved power switching mode\n");
			break;
	}


	/* Enable power to the ports */
	dev_dbg(hubdev(interface_to_usbdev(hub->intf)),
		"enabling power on all ports\n");
	dev = interface_to_usbdev(hub->intf);

	for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
		set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
		wait_ms(DelayPerPort);
	}

	/* Wait for power to be enabled */
	wait_ms(DelayAfterPort);
}

static int hub_hub_status(struct usb_hub *hub,
		u16 *status, u16 *change)
{
	struct usb_device *dev = interface_to_usbdev (hub->intf);
	int ret;

	ret = get_hub_status(dev, &hub->status->hub);
	if (ret < 0) {
		dev_err (hubdev (dev),
			"%s failed (err = %d)\n", __FUNCTION__, ret);
        }
	else {
		*status = le16_to_cpu(hub->status->hub.wHubStatus);
		*change = le16_to_cpu(hub->status->hub.wHubChange); 
		ret = 0;
	}
	return ret;
}

static int hub_configure(struct usb_hub *hub,
	struct usb_endpoint_descriptor *endpoint)
{
	struct usb_device *dev = interface_to_usbdev (hub->intf);
	struct device *hub_dev;
	u16 hubstatus, hubchange;
	unsigned int pipe;
	int maxp, ret;
	char *message;

	hub->buffer = usb_buffer_alloc(dev, sizeof(*hub->buffer), GFP_KERNEL,
			&hub->buffer_dma);
	if (!hub->buffer) {
		message = "can't allocate hub irq buffer";
		ret = -ENOMEM;
		goto fail;
	}

	hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
	if (!hub->status) {
		message = "can't kmalloc hub status buffer";
		ret = -ENOMEM;
		goto fail;
	}

	hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
	if (!hub->descriptor) {
		message = "can't kmalloc hub descriptor";
		ret = -ENOMEM;
		goto fail;
	}

	/* Request the entire hub descriptor.
	 * hub->descriptor can handle USB_MAXCHILDREN ports,
	 * but the hub can/will return fewer bytes here.
	 */
	ret = get_hub_descriptor(dev, hub->descriptor,
			sizeof(*hub->descriptor));
	if (ret < 0) {
		message = "can't read hub descriptor";
		goto fail;
	} else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
		message = "hub has too many ports!";
		// XBOX PATCH		hub->descriptor->bNbrPorts = 4;		//ret = -ENODEV;
		//goto fail;
	}

	hub_dev = hubdev(dev);
	dev->maxchild = hub->descriptor->bNbrPorts;
	dev_info (hub_dev, "%d port%s detected\n", dev->maxchild,
		(dev->maxchild == 1) ? "" : "s");

	le16_to_cpus(&hub->descriptor->wHubCharacteristics);

	if (hub->descriptor->wHubCharacteristics & HUB_CHAR_COMPOUND) {
		int	i;
		char	portstr [USB_MAXCHILDREN + 1];

		for (i = 0; i < dev->maxchild; i++)
			portstr[i] = hub->descriptor->DeviceRemovable
				    [((i + 1) / 8)] & (1 << ((i + 1) % 8))
				? 'F' : 'R';
		portstr[dev->maxchild] = 0;
		dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
	} else
		dev_dbg(hub_dev, "standalone hub\n");

	switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) {
		case 0x00:
			dev_dbg(hub_dev, "ganged power switching\n");
			break;
		case 0x01:
			dev_dbg(hub_dev, "individual port power switching\n");
			break;
		case 0x02:
		case 0x03:
			dev_dbg(hub_dev, "unknown reserved power switching mode\n");
			break;
	}

	switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) {
		case 0x00:
			dev_dbg(hub_dev, "global over-current protection\n");
			break;
		case 0x08:
			dev_dbg(hub_dev, "individual port over-current protection\n");
			break;
		case 0x10:
		case 0x18:
			dev_dbg(hub_dev, "no over-current protection\n");
                        break;
	}

	spin_lock_init (&hub->tt.lock);
	INIT_LIST_HEAD (&hub->tt.clear_list);
	INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
	switch (dev->descriptor.bDeviceProtocol) {
		case 0:
			break;
		case 1:
			dev_dbg(hub_dev, "Single TT\n");
			hub->tt.hub = dev;
			break;
		case 2:
			dev_dbg(hub_dev, "TT per port\n");
			hub->tt.hub = dev;
			hub->tt.multi = 1;
			break;
		default:
			dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
				dev->descriptor.bDeviceProtocol);
			break;
	}

	switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_TTTT) {
		case 0x00:
			if (dev->descriptor.bDeviceProtocol != 0)
				dev_dbg(hub_dev, "TT requires at most 8 FS bit times\n");
			break;
		case 0x20:
			dev_dbg(hub_dev, "TT requires at most 16 FS bit times\n");
			break;
		case 0x40:
			dev_dbg(hub_dev, "TT requires at most 24 FS bit times\n");
			break;
		case 0x60:
			dev_dbg(hub_dev, "TT requires at most 32 FS bit times\n");
			break;
	}

	dev_dbg(hub_dev, "Port indicators are %s supported\n", 
	    (hub->descriptor->wHubCharacteristics & HUB_CHAR_PORTIND)
	    	? "" : "not");

	if (hub->descriptor->bPwrOn2PwrGood<3) hub->descriptor->bPwrOn2PwrGood = 3;
	if (hub->descriptor->bPwrOn2PwrGood>20) hub->descriptor->bPwrOn2PwrGood = 20;

	dev_dbg(hub_dev, "power on to power good time: %dms\n",
		hub->descriptor->bPwrOn2PwrGood * 2);
	dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
		hub->descriptor->bHubContrCurrent);

	ret = hub_hub_status(hub, &hubstatus, &hubchange);
	if (ret < 0) {
		message = "can't get hub status";
		goto fail;
	}

	dev_dbg(hub_dev, "local power source is %s\n",
		(hubstatus & HUB_STATUS_LOCAL_POWER)
		? "lost (inactive)" : "good");

	dev_dbg(hub_dev, "%sover-current condition exists\n",
		(hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");

	/* Start the interrupt endpoint */
	pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
	maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe));

	if (maxp > sizeof(*hub->buffer))