otg_hub.c

philips公司ISP1362 USB OTG控制芯片的驱动

		case 0:
			break;
		case 1:
			dbg("Single TT");
			break;
		case 2:
			dbg("Multiple TT");
			break;
		default:
			dbg("Unrecognized hub protocol %d",
				dev->descriptor.bDeviceProtocol);
			break;
	}

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

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

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

	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;

	dbg("port removable status: %s", portstr);

	ret = usb_get_hub_status(dev, &hubstatus);
	if (ret < 0) {
		err("Unable to get hub status (err = %d)", ret);
		kfree(hub->descriptor);
		return -1;
	}

	le16_to_cpus(&hubstatus.wHubStatus);

	dbg("local power source is %s",
		(hubstatus.wHubStatus & HUB_STATUS_LOCAL_POWER) ? "lost (inactive)" : "good");

	dbg("%sover-current condition exists",
		(hubstatus.wHubStatus & 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))
		maxp = sizeof(hub->buffer);

	hub->urb = usb_alloc_urb(0);
	if (!hub->urb) {
		err("couldn't allocate interrupt urb");
		kfree(hub->descriptor);
		return -1;
	}

	FILL_INT_URB(hub->urb, dev, pipe, hub->buffer, maxp, hub_irq,
		hub, endpoint->bInterval);
	ret = usb_submit_urb(hub->urb);
	if (ret) {
		err("usb_submit_urb failed (%d)", ret);
		kfree(hub->descriptor);
		return -1;
	}
		
	/* Wake up khubd */
	wake_up(&khubd_wait);

	usb_hub_power_on(hub);

	return 0;
}

static void *hub_probe(struct usb_device *dev, unsigned int i,
		       const struct usb_device_id *id)
{
	struct usb_interface_descriptor *interface;
	struct usb_endpoint_descriptor *endpoint;
	struct usb_hub *hub;
	unsigned long flags;

	interface = &dev->actconfig->interface[i].altsetting[0];

	/* Some hubs have a subclass of 1, which AFAICT according to the */
	/*  specs is not defined, but it works */
	if ((interface->bInterfaceSubClass != 0) &&
	    (interface->bInterfaceSubClass != 1)) {
		err("invalid subclass (%d) for USB hub device #%d",
			interface->bInterfaceSubClass, dev->devnum);
		return NULL;
	}

	/* Multiple endpoints? What kind of mutant ninja-hub is this? */
	if (interface->bNumEndpoints != 1) {
		err("invalid bNumEndpoints (%d) for USB hub device #%d",
			interface->bNumEndpoints, dev->devnum);
		return NULL;
	}

	endpoint = &interface->endpoint[0];

	/* Output endpoint? Curiousier and curiousier.. */
	if (!(endpoint->bEndpointAddress & USB_DIR_IN)) {
		err("Device #%d is hub class, but has output endpoint?",
			dev->devnum);
		return NULL;
	}

	/* If it's not an interrupt endpoint, we'd better punt! */
	if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_INT) {
		err("Device #%d is hub class, but has endpoint other than interrupt?",
			dev->devnum);
		return NULL;
	}

	/* We found a hub */
	info("USB hub found");

	hub = kmalloc(sizeof(*hub), GFP_KERNEL);
	if (!hub) {
		err("couldn't kmalloc hub struct");
		return NULL;
	}

	memset(hub, 0, sizeof(*hub));

	INIT_LIST_HEAD(&hub->event_list);
	hub->dev = dev;
	init_MUTEX(&hub->khubd_sem);

	/* Record the new hub's existence */
	spin_lock_irqsave(&hub_event_lock, flags);
	INIT_LIST_HEAD(&hub->hub_list);
	list_add(&hub->hub_list, &hub_list);
	spin_unlock_irqrestore(&hub_event_lock, flags);

	if (usb_hub_configure(hub, endpoint) >= 0)
		return hub;

	err("hub configuration failed for device #%d", dev->devnum);

	/* free hub, but first clean up its list. */
	spin_lock_irqsave(&hub_event_lock, flags);

	/* Delete it and then reset it */
	list_del(&hub->event_list);
	INIT_LIST_HEAD(&hub->event_list);
	list_del(&hub->hub_list);
	INIT_LIST_HEAD(&hub->hub_list);

	spin_unlock_irqrestore(&hub_event_lock, flags);

	kfree(hub);

	return NULL;
}

static void hub_disconnect(struct usb_device *dev, void *ptr)
{
	struct usb_hub *hub = (struct usb_hub *)ptr;
	unsigned long flags;

	spin_lock_irqsave(&hub_event_lock, flags);

	/* Delete it and then reset it */
	list_del(&hub->event_list);
	INIT_LIST_HEAD(&hub->event_list);
	list_del(&hub->hub_list);
	INIT_LIST_HEAD(&hub->hub_list);

	spin_unlock_irqrestore(&hub_event_lock, flags);

	down(&hub->khubd_sem); /* Wait for khubd to leave this hub alone. */
	up(&hub->khubd_sem);

	if (hub->urb) {
		usb_unlink_urb(hub->urb);
		usb_free_urb(hub->urb);
		hub->urb = NULL;
	}

	if (hub->descriptor) {
		kfree(hub->descriptor);
		hub->descriptor = NULL;
	}

	/* Free the memory */
	kfree(hub);
}

static int hub_ioctl(struct usb_device *hub, unsigned int code, void *user_data)
{
	/* assert ifno == 0 (part of hub spec) */
	switch (code) {
	case USBDEVFS_HUB_PORTINFO: {
		struct usbdevfs_hub_portinfo *info = user_data;
		unsigned long flags;
		int i;

		spin_lock_irqsave(&hub_event_lock, flags);
		if (hub->devnum <= 0)
			info->nports = 0;
		else {
			info->nports = hub->maxchild;
			for (i = 0; i < info->nports; i++) {
				if (hub->children[i] == NULL)
					info->port[i] = 0;
				else
					info->port[i] = hub->children[i]->devnum;
			}
		}
		spin_unlock_irqrestore(&hub_event_lock, flags);

		return info->nports + 1;
		}

	default:
		return -ENOSYS;
	}
}

static int usb_hub_reset(struct usb_hub *hub)
{
	struct usb_device *dev = hub->dev;
	int i;

	/* Disconnect any attached devices */
	for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
		if (dev->children[i])
			usb_disconnect(&dev->children[i]);
	}

	/* Attempt to reset the hub */
	if (hub->urb)
		usb_unlink_urb(hub->urb);
	else
		return -1;

	if (usb_reset_device(dev))
		return -1;

	hub->urb->dev = dev;                                                    
	if (usb_submit_urb(hub->urb))
		return -1;

	usb_hub_power_on(hub);

	return 0;
}

static void usb_hub_disconnect(struct usb_device *dev)
{
	struct usb_device *parent = dev->parent;
	int i;

	/* Find the device pointer to disconnect */
	if (parent) {
		for (i = 0; i < parent->maxchild; i++) {
			if (parent->children[i] == dev) {
				usb_disconnect(&parent->children[i]);
				return;
			}
		}
	}

	err("cannot disconnect hub %d", dev->devnum);
}

#define HUB_RESET_TRIES		5
#define HUB_PROBE_TRIES		2
#define HUB_SHORT_RESET_TIME	10
#define HUB_LONG_RESET_TIME	200
#define HUB_RESET_TIMEOUT	500
#define	OTG_HUB_RESET_TIME	50


/* return: -1 on error, 0 on success, 1 on disconnect.  */
static int usb_hub_port_wait_reset(struct usb_device *hub, int port,
				struct usb_device *dev, unsigned int delay)
{
	int delay_time, ret;
	struct usb_port_status portsts;
	unsigned short portchange, portstatus;

	for (delay_time = 0; delay_time < HUB_RESET_TIMEOUT; delay_time += delay) {
		/* wait to give the device a chance to reset */
		wait_ms(delay);
		
		/* read and decode port status */
		ret = usb_get_port_status(hub, port + 1, &portsts);
		if (ret < 0) {
			err("get_port_status(%d) failed (err = %d)", port + 1, ret);
			return -1;
		}

		portstatus = le16_to_cpu(portsts.wPortStatus);
		portchange = le16_to_cpu(portsts.wPortChange);
		dbg("port %d, portstatus %x, change %x, %s", port + 1,
			portstatus, portchange, portspeed (portstatus));

		/* bomb out completely if something weird happened */
		if ((portchange & USB_PORT_STAT_C_CONNECTION))
			return -1;

		/* if we`ve finished resetting, then break out of the loop */
		if (!(portstatus & USB_PORT_STAT_RESET) &&
		    (portstatus & USB_PORT_STAT_ENABLE)) {
			if (portstatus & USB_PORT_STAT_HIGH_SPEED)
				dev->speed = USB_SPEED_HIGH;
			else if (portstatus & USB_PORT_STAT_LOW_SPEED)
				dev->speed = USB_SPEED_LOW;
			else
				dev->speed = USB_SPEED_FULL;
			return 0;
		}

		/* switch to the long delay after two short delay failures */
		if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
			delay = HUB_LONG_RESET_TIME;

		dbg("port %d of hub %d not reset yet, waiting %dms", port + 1,
			hub->devnum, delay);
	}

	return -1;
}

/* return: -1 on error, 0 on success, 1 on disconnect.  */
static int usb_hub_port_reset(struct usb_device *hub, int port,
				struct usb_device *dev, unsigned int delay)
{
	int i, status, j;

	/* Reset the port */
	for (i = 0; i < HUB_RESET_TRIES; i++) {

		usb_set_port_feature(hub, port + 1, USB_PORT_FEAT_RESET);

		if(dev->parent == dev->bus->root_hub) {
			/* Root hub ports, Need Special Treatment 
			OTG ports need a reset of 50 msec continouse reset */
			for(j=0; j < ((OTG_HUB_RESET_TIME/HUB_SHORT_RESET_TIME) +1); j++) {
				mdelay(HUB_SHORT_RESET_TIME);
				usb_set_port_feature(hub, port + 1, USB_PORT_FEAT_RESET);
			}
			mdelay(2*HUB_SHORT_RESET_TIME);
		}

		/* return on disconnect or reset */
		status = usb_hub_port_wait_reset(hub, port, dev, delay);
		if (status != -1) {
			usb_clear_port_feature(hub, port + 1, USB_PORT_FEAT_C_RESET);
			return status;
		}

		dbg("port %d of hub %d not enabled, trying reset again...",
			port + 1, hub->devnum);
		delay = HUB_LONG_RESET_TIME;
	}

	err("Cannot enable port %i of hub %d, disabling port.",
		port + 1, hub->devnum);
	err("Maybe the USB cable is bad?");

	return -1;
}

void usb_hub_port_disable(struct usb_device *hub, int port)
{
	int ret;