USB_BUFFER_MAP(9) USB Core APIs USB_BUFFER_MAP(9)NAME
usb_buffer_map - create DMA mapping(s) for an urb
struct urb * usb_buffer_map(struct urb * urb);
urb whose transfer_buffer/setup_packet will be mapped
URB_NO_TRANSFER_DMA_MAP is added to urb->transfer_flags if the operation succeeds. If the device is connected to this system through a
non-DMA controller, this operation always succeeds.
This call would normally be used for an urb which is reused, perhaps as the target of a large periodic transfer, with usb_buffer_dmasync
calls to synchronize memory and dma state.
Reverse the effect of this call with usb_buffer_unmap.
Either NULL (indicating no buffer could be mapped), or urb.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_BUFFER_MAP(9)
Check Out this Related Man Page
USB_FILL_INT_URB(9) Host-Side Data Types and Macro USB_FILL_INT_URB(9)NAME
usb_fill_int_urb - macro to help initialize a interrupt urb
void usb_fill_int_urb(struct urb * urb, struct usb_device * dev, unsigned int pipe, void * transfer_buffer, int buffer_length,
usb_complete_t complete_fn, void * context, int interval);
pointer to the urb to initialize.
pointer to the struct usb_device for this urb.
the endpoint pipe
pointer to the transfer buffer
length of the transfer buffer
pointer to the usb_complete_t function
what to set the urb context to.
what to set the urb interval to, encoded like the endpoint descriptor's bInterval value.
Initializes a interrupt urb with the proper information needed to submit it to a device.
Note that High Speed and SuperSpeed interrupt endpoints use a logarithmic encoding of the endpoint interval, and express polling intervals
in microframes (eight per millisecond) rather than in frames (one per millisecond).
Wireless USB also uses the logarithmic encoding, but specifies it in units of 128us instead of 125us. For Wireless USB devices, the
interval is passed through to the host controller, rather than being translated into microframe units.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_FILL_INT_URB(9)
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