dummy_hcd.c

ARM S3C2410 USB SLAVE LINUX驱动

	ep = usb_ep_to_dummy_ep (_ep);
	dum = ep_to_dummy (ep);

	if (!dum->driver)
		return NULL;
	retval = kmalloc (bytes, mem_flags);
	*dma = (dma_addr_t) retval;
	return retval;
}

static void
dummy_free_buffer (
	struct usb_ep *_ep,
	void *buf,
	dma_addr_t dma,
	unsigned bytes
) {
	if (bytes)
		kfree (buf);
}

static void
fifo_complete (struct usb_ep *ep, struct usb_request *req)
{
}

static int
dummy_queue (struct usb_ep *_ep, struct usb_request *_req,
		unsigned mem_flags)
{
	struct dummy_ep		*ep;
	struct dummy_request	*req;
	struct dummy		*dum;
	unsigned long		flags;

	req = usb_request_to_dummy_request (_req);
	if (!_req || !list_empty (&req->queue) || !_req->complete)
		return -EINVAL;

	ep = usb_ep_to_dummy_ep (_ep);
	if (!_ep || (!ep->desc && _ep->name != ep0name))
		return -EINVAL;

	dum = ep_to_dummy (ep);
	if (!dum->driver || !is_enabled (dum))
		return -ESHUTDOWN;

#if 0
	dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
			ep, _req, _ep->name, _req->length, _req->buf);
#endif

	_req->status = -EINPROGRESS;
	_req->actual = 0;
	spin_lock_irqsave (&dum->lock, flags);

	/* implement an emulated single-request FIFO */
	if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
			list_empty (&dum->fifo_req.queue) &&
			list_empty (&ep->queue) &&
			_req->length <= FIFO_SIZE) {
		req = &dum->fifo_req;
		req->req = *_req;
		req->req.buf = dum->fifo_buf;
		memcpy (dum->fifo_buf, _req->buf, _req->length);
		req->req.context = dum;
		req->req.complete = fifo_complete;

		spin_unlock (&dum->lock);
		_req->actual = _req->length;
		_req->status = 0;
		_req->complete (_ep, _req);
		spin_lock (&dum->lock);
	}
	list_add_tail (&req->queue, &ep->queue);
	spin_unlock_irqrestore (&dum->lock, flags);

	/* real hardware would likely enable transfers here, in case
	 * it'd been left NAKing.
	 */
	return 0;
}

static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
{
	struct dummy_ep		*ep;
	struct dummy		*dum;
	int			retval = -EINVAL;
	unsigned long		flags;
	struct dummy_request	*req = NULL;

	if (!_ep || !_req)
		return retval;
	ep = usb_ep_to_dummy_ep (_ep);
	dum = ep_to_dummy (ep);

	if (!dum->driver)
		return -ESHUTDOWN;

	spin_lock_irqsave (&dum->lock, flags);
	list_for_each_entry (req, &ep->queue, queue) {
		if (&req->req == _req) {
			list_del_init (&req->queue);
			_req->status = -ECONNRESET;
			retval = 0;
			break;
		}
	}
	spin_unlock_irqrestore (&dum->lock, flags);

	if (retval == 0) {
		dev_dbg (udc_dev(dum),
				"dequeued req %p from %s, len %d buf %p\n",
				req, _ep->name, _req->length, _req->buf);
		_req->complete (_ep, _req);
	}
	return retval;
}

static int
dummy_set_halt (struct usb_ep *_ep, int value)
{
	struct dummy_ep		*ep;
	struct dummy		*dum;

	if (!_ep)
		return -EINVAL;
	ep = usb_ep_to_dummy_ep (_ep);
	dum = ep_to_dummy (ep);
	if (!dum->driver)
		return -ESHUTDOWN;
	if (!value)
		ep->halted = 0;
	else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
			!list_empty (&ep->queue))
		return -EAGAIN;
	else
		ep->halted = 1;
	/* FIXME clear emulated data toggle too */
	return 0;
}

static const struct usb_ep_ops dummy_ep_ops = {
	.enable		= dummy_enable,
	.disable	= dummy_disable,

	.alloc_request	= dummy_alloc_request,
	.free_request	= dummy_free_request,

	.alloc_buffer	= dummy_alloc_buffer,
	.free_buffer	= dummy_free_buffer,
	/* map, unmap, ... eventually hook the "generic" dma calls */

	.queue		= dummy_queue,
	.dequeue	= dummy_dequeue,

	.set_halt	= dummy_set_halt,
};

/*-------------------------------------------------------------------------*/

/* there are both host and device side versions of this call ... */
static int dummy_g_get_frame (struct usb_gadget *_gadget)
{
	struct timeval	tv;

	do_gettimeofday (&tv);
	return tv.tv_usec / 1000;
}

static int dummy_wakeup (struct usb_gadget *_gadget)
{
	struct dummy	*dum;

	dum = gadget_to_dummy (_gadget);
	if (!(dum->devstatus &	( (1 << USB_DEVICE_B_HNP_ENABLE)
				| (1 << USB_DEVICE_REMOTE_WAKEUP))))
		return -EINVAL;
	if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0)
		return -ENOLINK;
	if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
			 dum->rh_state != DUMMY_RH_SUSPENDED)
		return -EIO;

	/* FIXME: What if the root hub is suspended but the port isn't? */

	/* hub notices our request, issues downstream resume, etc */
	dum->resuming = 1;
	dum->re_timeout = jiffies + msecs_to_jiffies(20);
	mod_timer (&dummy_to_hcd (dum)->rh_timer, dum->re_timeout);
	return 0;
}

static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
{
	struct dummy	*dum;

	dum = gadget_to_dummy (_gadget);
	if (value)
		dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
	else
		dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
	return 0;
}

static int dummy_pullup (struct usb_gadget *_gadget, int value)
{
	struct dummy	*dum;
	unsigned long	flags;

	dum = gadget_to_dummy (_gadget);
	spin_lock_irqsave (&dum->lock, flags);
	dum->pullup = (value != 0);
	set_link_state (dum);
	spin_unlock_irqrestore (&dum->lock, flags);

	usb_hcd_poll_rh_status (dummy_to_hcd (dum));
	return 0;
}

static const struct usb_gadget_ops dummy_ops = {
	.get_frame	= dummy_g_get_frame,
	.wakeup		= dummy_wakeup,
	.set_selfpowered = dummy_set_selfpowered,
	.pullup		= dummy_pullup,
};

/*-------------------------------------------------------------------------*/

/* "function" sysfs attribute */
static ssize_t
show_function (struct device *dev, struct device_attribute *attr, char *buf)
{
	struct dummy	*dum = gadget_dev_to_dummy (dev);

	if (!dum->driver || !dum->driver->function)
		return 0;
	return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
}
static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);

/*-------------------------------------------------------------------------*/

/*
 * Driver registration/unregistration.
 *
 * This is basically hardware-specific; there's usually only one real USB
 * device (not host) controller since that's how USB devices are intended
 * to work.  So most implementations of these api calls will rely on the
 * fact that only one driver will ever bind to the hardware.  But curious
 * hardware can be built with discrete components, so the gadget API doesn't
 * require that assumption.
 *
 * For this emulator, it might be convenient to create a usb slave device
 * for each driver that registers:  just add to a big root hub.
 */

int
usb_gadget_register_driver (struct usb_gadget_driver *driver)
{
	struct dummy	*dum = the_controller;
	int		retval, i;

	if (!dum)
		return -EINVAL;
	if (dum->driver)
		return -EBUSY;
	if (!driver->bind || !driver->unbind || !driver->setup
			|| driver->speed == USB_SPEED_UNKNOWN)
		return -EINVAL;

	/*
	 * SLAVE side init ... the layer above hardware, which
	 * can't enumerate without help from the driver we're binding.
	 */

	dum->devstatus = 0;

	INIT_LIST_HEAD (&dum->gadget.ep_list);
	for (i = 0; i < DUMMY_ENDPOINTS; i++) {
		struct dummy_ep	*ep = &dum->ep [i];

		if (!ep_name [i])
			break;
		ep->ep.name = ep_name [i];
		ep->ep.ops = &dummy_ep_ops;
		list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
		ep->halted = ep->already_seen = ep->setup_stage = 0;
		ep->ep.maxpacket = ~0;
		ep->last_io = jiffies;
		ep->gadget = &dum->gadget;
		ep->desc = NULL;
		INIT_LIST_HEAD (&ep->queue);
	}

	dum->gadget.ep0 = &dum->ep [0].ep;
	dum->ep [0].ep.maxpacket = 64;
	list_del_init (&dum->ep [0].ep.ep_list);
	INIT_LIST_HEAD(&dum->fifo_req.queue);

	dum->driver = driver;
	dum->gadget.dev.driver = &driver->driver;
	dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
			driver->driver.name);
	if ((retval = driver->bind (&dum->gadget)) != 0) {
		dum->driver = NULL;
		dum->gadget.dev.driver = NULL;
		return retval;
	}

	driver->driver.bus = dum->gadget.dev.parent->bus;
	driver_register (&driver->driver);
	device_bind_driver (&dum->gadget.dev);

	/* khubd will enumerate this in a while */
	spin_lock_irq (&dum->lock);
	dum->pullup = 1;
	set_link_state (dum);
	spin_unlock_irq (&dum->lock);

	usb_hcd_poll_rh_status (dummy_to_hcd (dum));
	return 0;
}
EXPORT_SYMBOL (usb_gadget_register_driver);

int
usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
{
	struct dummy	*dum = the_controller;
	unsigned long	flags;

	if (!dum)
		return -ENODEV;
	if (!driver || driver != dum->driver)
		return -EINVAL;

	dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
			driver->driver.name);

	spin_lock_irqsave (&dum->lock, flags);
	dum->pullup = 0;
	set_link_state (dum);
	spin_unlock_irqrestore (&dum->lock, flags);

	driver->unbind (&dum->gadget);
	dum->driver = NULL;

	device_release_driver (&dum->gadget.dev);
	driver_unregister (&driver->driver);

	spin_lock_irqsave (&dum->lock, flags);
	dum->pullup = 0;
	set_link_state (dum);
	spin_unlock_irqrestore (&dum->lock, flags);

	usb_hcd_poll_rh_status (dummy_to_hcd (dum));
	return 0;
}
EXPORT_SYMBOL (usb_gadget_unregister_driver);

#undef is_enabled

/* just declare this in any driver that really need it */
extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);

int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
{
	return -ENOSYS;
}
EXPORT_SYMBOL (net2280_set_fifo_mode);


/* The gadget structure is stored inside the hcd structure and will be
 * released along with it. */
static void
dummy_gadget_release (struct device *dev)
{
#if 0		/* usb_bus_put isn't EXPORTed! */
	struct dummy	*dum = gadget_dev_to_dummy (dev);

	usb_bus_put (&dummy_to_hcd (dum)->self);
#endif
}

static int dummy_udc_probe (struct device *dev)
{
	struct dummy	*dum = the_controller;
	int		rc;

	dum->gadget.name = gadget_name;
	dum->gadget.ops = &dummy_ops;
	dum->gadget.is_dualspeed = 1;

	/* maybe claim OTG support, though we won't complete HNP */
	dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);

	strcpy (dum->gadget.dev.bus_id, "gadget");
	dum->gadget.dev.parent = dev;
	dum->gadget.dev.release = dummy_gadget_release;
	rc = device_register (&dum->gadget.dev);
	if (rc < 0)
		return rc;

#if 0		/* usb_bus_get isn't EXPORTed! */
	usb_bus_get (&dummy_to_hcd (dum)->self);
#endif

	dev_set_drvdata (dev, dum);
	device_create_file (&dum->gadget.dev, &dev_attr_function);
	return rc;
}

static int dummy_udc_remove (struct device *dev)
{
	struct dummy	*dum = dev_get_drvdata (dev);

	dev_set_drvdata (dev, NULL);
	device_remove_file (&dum->gadget.dev, &dev_attr_function);
	device_unregister (&dum->gadget.dev);
	return 0;
}

static int dummy_udc_suspend (struct device *dev, pm_message_t state,
		u32 level)
{
	struct dummy	*dum = dev_get_drvdata(dev);

	if (level != SUSPEND_DISABLE)
		return 0;

	dev_dbg (dev, "%s\n", __FUNCTION__);
	spin_lock_irq (&dum->lock);
	dum->udc_suspended = 1;
	set_link_state (dum);
	spin_unlock_irq (&dum->lock);

	dev->power.power_state = state;
	usb_hcd_poll_rh_status (dummy_to_hcd (dum));
	return 0;
}

static int dummy_udc_resume (struct device *dev, u32 level)
{
	struct dummy	*dum = dev_get_drvdata(dev);

	if (level != RESUME_ENABLE)
		return 0;

	dev_dbg (dev, "%s\n", __FUNCTION__);
	spin_lock_irq (&dum->lock);
	dum->udc_suspended = 0;
	set_link_state (dum);
	spin_unlock_irq (&dum->lock);

	dev->power.power_state = PMSG_ON;
	usb_hcd_poll_rh_status (dummy_to_hcd (dum));
	return 0;
}

static struct device_driver dummy_udc_driver = {
	.name		= (char *) gadget_name,
	.bus		= &platform_bus_type,
	.probe		= dummy_udc_probe,
	.remove		= dummy_udc_remove,
	.suspend	= dummy_udc_suspend,
	.resume		= dummy_udc_resume,
};

/*-------------------------------------------------------------------------*/

/* MASTER/HOST SIDE DRIVER
 *
 * this uses the hcd framework to hook up to host side drivers.
 * its root hub will only have one device, otherwise it acts like
 * a normal host controller.
 *
 * when urbs are queued, they're just stuck on a list that we
 * scan in a timer callback.  that callback connects writes from
 * the host with reads from the device, and so on, based on the
 * usb 2.0 rules.
 */

static int dummy_urb_enqueue (
	struct usb_hcd			*hcd,
	struct usb_host_endpoint	*ep,
	struct urb			*urb,
	unsigned			mem_flags
) {
	struct dummy	*dum;
	struct urbp	*urbp;
	unsigned long	flags;

	if (!urb->transfer_buffer && urb->transfer_buffer_length)
		return -EINVAL;

	urbp = kmalloc (sizeof *urbp, mem_flags);
	if (!urbp)
		return -ENOMEM;
	urbp->urb = urb;

	dum = hcd_to_dummy (hcd);
	spin_lock_irqsave (&dum->lock, flags);

	if (!dum->udev) {
		dum->udev = urb->dev;
		usb_get_dev (dum->udev);
	} else if (unlikely (dum->udev != urb->dev))
		dev_err (dummy_dev(dum), "usb_device address has changed!\n");

	list_add_tail (&urbp->urbp_list, &dum->urbp_list);
	urb->hcpriv = urbp;
	if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
		urb->error_count = 1;		/* mark as a new urb */

	/* kick the scheduler, it'll do the rest */