The Linux Kernel API
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usb_bulk_msg

Name

usb_bulk_msg --  Builds a bulk urb, sends it off and waits for completion

Synopsis

int usb_bulk_msg (struct usb_device * usb_dev, unsigned int pipe, void * data, int len, int * actual_length, int timeout);

Arguments

usb_dev

pointer to the usb device to send the message to

pipe

endpoint "pipe" to send the message to

data

pointer to the data to send

len

length in bytes of the data to send

actual_length

pointer to a location to put the actual length transferred in bytes

timeout

time to wait for the message to complete before timing out (if 0 the wait is forever)

Description

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

If successful, it returns 0, otherwise a negative error number. The number of actual bytes transferred will be stored in the actual_length paramater.

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

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