USB_SG_INIT(9) USB Core APIs USB_SG_INIT(9)NAME
usb_sg_init - initializes scatterlist-based bulk/interrupt I/O request
SYNOPSIS
int usb_sg_init(struct usb_sg_request * io, struct usb_device * dev, unsigned pipe, unsigned period, struct scatterlist * sg, int nents,
size_t length, gfp_t mem_flags);
ARGUMENTS
io
request block being initialized. until usb_sg_wait returns, treat this as a pointer to an opaque block of memory,
dev
the usb device that will send or receive the data
pipe
endpoint "pipe" used to transfer the data
period
polling rate for interrupt endpoints, in frames or (for high speed endpoints) microframes; ignored for bulk
sg
scatterlist entries
nents
how many entries in the scatterlist
length
how many bytes to send from the scatterlist, or zero to send every byte identified in the list.
mem_flags
SLAB_* flags affecting memory allocations in this call
DESCRIPTION
This initializes a scatter/gather request, allocating resources such as I/O mappings and urb memory (except maybe memory used by USB
controller drivers).
The request must be issued using usb_sg_wait, which waits for the I/O to complete (or to be canceled) and then cleans up all resources
allocated by usb_sg_init.
The request may be canceled with usb_sg_cancel, either before or after usb_sg_wait is called.
RETURN
Zero for success, else a negative errno value.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_SG_INIT(9)
Check Out this Related Man Page
USB_CONTROL_MSG(9) USB Core APIs USB_CONTROL_MSG(9)NAME
usb_control_msg - Builds a control urb, sends it off and waits for completion
SYNOPSIS
int usb_control_msg(struct usb_device * dev, unsigned int pipe, __u8 request, __u8 requesttype, __u16 value, __u16 index, void * data,
__u16 size, int timeout);
ARGUMENTS
dev
pointer to the usb device to send the message to
pipe
endpoint "pipe" to send the message to
request
USB message request value
requesttype
USB message request type value
value
USB message value
index
USB message index value
data
pointer to the data to send
size
length in bytes of the data to send
timeout
time in msecs to wait for the message to complete before timing out (if 0 the wait is forever)
CONTEXT
!in_interrupt ()
DESCRIPTION
This function sends a simple control message to a specified endpoint and waits for the message to complete, or timeout.
Don't use this function from within an interrupt context, like a bottom half handler. If you need an asynchronous message, or need to send
a message from within interrupt context, use usb_submit_urb. If a thread in your driver uses this call, make sure your disconnect method
can wait for it to complete. Since you don't have a handle on the URB used, you can't cancel the request.
RETURN
If successful, the number of bytes transferred. Otherwise, a negative error number.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_CONTROL_MSG(9)
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