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Commit f906c280 authored by Hemant Kumar's avatar Hemant Kumar
Browse files

usb: core: Add helper function to return controller id 



Function provides controller id used by a remote entity
to identify which usb controller to program to initiate
data transfer.

Change-Id: Ied396f34496104c139a7910ee86844c124e6803f
Signed-off-by: default avatarHemant Kumar <hemantk@codeaurora.org>
parent a7e7dd8a

drivers/usb/core/hcd.c

+10 −0
Original line number Diff line number Diff line
@@ -2292,6 +2292,16 @@ usb_hcd_get_xfer_ring_dma_addr(struct usb_device *udev, 
	return hcd->driver->get_xfer_ring_dma_addr(hcd, udev, ep);

}



int usb_hcd_get_controller_id(struct usb_device *udev)

{

	struct usb_hcd	*hcd = bus_to_hcd(udev->bus);



	if (!HCD_RH_RUNNING(hcd))

		return -EINVAL;



	return hcd->driver->get_core_id(hcd);

}



#ifdef	CONFIG_PM



int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)

drivers/usb/core/usb.c

+9 −0
Original line number Diff line number Diff line
@@ -876,6 +876,15 @@ dma_addr_t usb_get_xfer_ring_dma_addr(struct usb_device *dev, 
}

EXPORT_SYMBOL(usb_get_xfer_ring_dma_addr);



int usb_get_controller_id(struct usb_device *dev)

{

	if (dev->state == USB_STATE_NOTATTACHED)

		return -EINVAL;



	return usb_hcd_get_controller_id(dev);

}

EXPORT_SYMBOL(usb_get_controller_id);



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

/*

 * __usb_get_extra_descriptor() finds a descriptor of specific type in the

include/linux/usb.h

+1 −0
Original line number Diff line number Diff line
@@ -836,6 +836,7 @@ extern dma_addr_t usb_get_sec_event_ring_dma_addr(struct usb_device *dev, 
extern dma_addr_t usb_get_dcba_dma_addr(struct usb_device *dev);

extern dma_addr_t usb_get_xfer_ring_dma_addr(struct usb_device *dev,

	struct usb_host_endpoint *ep);

extern int usb_get_controller_id(struct usb_device *dev);



/* Sets up a group of bulk endpoints to support multiple stream IDs. */

extern int usb_alloc_streams(struct usb_interface *interface,

include/linux/usb/hcd.h

+2 −0
Original line number Diff line number Diff line
@@ -416,6 +416,7 @@ struct hc_driver { 
			struct usb_device *udev, struct usb_host_endpoint *ep);

	dma_addr_t (*get_dcba_dma_addr)(struct usb_hcd *hcd,

			struct usb_device *udev);

	int (*get_core_id)(struct usb_hcd *hcd);

};



static inline int hcd_giveback_urb_in_bh(struct usb_hcd *hcd)
@@ -463,6 +464,7 @@ extern dma_addr_t usb_hcd_get_sec_event_ring_dma_addr(struct usb_device *udev, 
extern dma_addr_t usb_hcd_get_dcba_dma_addr(struct usb_device *udev);

extern dma_addr_t usb_hcd_get_xfer_ring_dma_addr(struct usb_device *udev,

	struct usb_host_endpoint *ep);

extern int usb_hcd_get_controller_id(struct usb_device *udev);



struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,

		struct device *sysdev, struct device *dev, const char *bus_name,