Commit a698908d authored by Felipe Balbi's avatar Felipe Balbi
Browse files

usb: gadget: add generic map/unmap request utilities 



such utilities are currently duplicated on all UDC
drivers basically with the same structure. Let's group
all implementations into one generic implementation
and get rid of that duplication.

Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent c15e03e1

drivers/usb/gadget/udc-core.c

+52 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/device.h>

#include <linux/list.h>

#include <linux/err.h>

#include <linux/dma-mapping.h>



#include <linux/usb/ch9.h>

#include <linux/usb/gadget.h>
@@ -49,6 +50,57 @@ static DEFINE_MUTEX(udc_lock); 


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



int usb_gadget_map_request(struct usb_gadget *gadget,

		struct usb_request *req, int is_in)

{

	if (req->length == 0)

		return 0;



	if (req->num_sgs) {

		int     mapped;



		mapped = dma_map_sg(&gadget->dev, req->sg, req->num_sgs,

				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);

		if (mapped == 0) {

			dev_err(&gadget->dev, "failed to map SGs\n");

			return -EFAULT;

		}



		req->num_mapped_sgs = mapped;

	} else {

		req->dma = dma_map_single(&gadget->dev, req->buf, req->length,

				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);



		if (dma_mapping_error(&gadget->dev, req->dma)) {

			dev_err(&gadget->dev, "failed to map buffer\n");

			return -EFAULT;

		}

	}



	return 0;

}

EXPORT_SYMBOL_GPL(usb_gadget_map_request);



void usb_gadget_unmap_request(struct usb_gadget *gadget,

		struct usb_request *req, int is_in)

{

	if (req->length == 0)

		return;



	if (req->num_mapped_sgs) {

		dma_unmap_sg(&gadget->dev, req->sg, req->num_mapped_sgs,

				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);



		req->num_mapped_sgs = 0;

	} else {

		dma_unmap_single(&gadget->dev, req->dma, req->length,

				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);

	}

}

EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);



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



/**

 * usb_gadget_start - tells usb device controller to start up

 * @gadget: The gadget we want to get started

include/linux/usb/gadget.h

+10 −0
Original line number Diff line number Diff line
@@ -950,6 +950,16 @@ static inline void usb_free_descriptors(struct usb_descriptor_header **v) 


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



/* utility to simplify map/unmap of usb_requests to/from DMA */



extern int usb_gadget_map_request(struct usb_gadget *gadget,

		struct usb_request *req, int is_in);



extern void usb_gadget_unmap_request(struct usb_gadget *gadget,

		struct usb_request *req, int is_in);



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



/* utility wrapping a simple endpoint selection policy */



extern struct usb_ep *usb_ep_autoconfig(struct usb_gadget *,

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