The Linux-USB Host Side API | ||
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pointer to the usb device to send the message to
endpoint "pipe" to send the message to
USB message request value
USB message request type value
USB message value
USB message index value
pointer to the data to send
length in bytes of the data to send
time in jiffies to wait for the message to complete before timing out (if 0 the wait is forever)
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 a negative error number.
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.
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usb_kill_urb | Up | usb_bulk_msg |