Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-16 17:12:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

usb: gadget: add generic map/unmap request utilities

Browse Source 
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: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Felipe Balbi 2011-12-15 13:31:48 +02:00
parent c15e03e155
commit a698908d3b
2 changed files with 62 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
drivers/usb/gadget/udc-core.c
View File

@ -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

10
include/linux/usb/gadget.h
View File

@ -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 *,