usb_control_msg

Section: Kernel Hacker's Manual (9)
Updated: usb_control_msg
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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 to wait for the message to complete before timing out (if 0 the wait is forever)

DESCRIPTION

This function sends a simple control message to a specified endpoint and waits for the message to complete, or timeout.

If successful, it returns the number of bytes transferred; otherwise, it returns a negative error number.

Don't use this function from within an interrupt context, like a bottom half handler. If you need a asyncronous message, or need to send a message from within interrupt context, use usb_submit_urb

This document was created by man2html, using the manual pages.
Time: 03:51:45 GMT, June 12, 2005