1USB_INTERRUPT_MSG(9)             USB Core APIs            USB_INTERRUPT_MSG(9)
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NAME

6       usb_interrupt_msg - Builds an interrupt urb, sends it off and waits for
7       completion
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SYNOPSIS

10       int usb_interrupt_msg(struct usb_device * usb_dev, unsigned int pipe,
11                             void * data, int len, int * actual_length,
12                             int timeout);
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ARGUMENTS

15       usb_dev
16           pointer to the usb device to send the message to
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18       pipe
19           endpoint “pipe” to send the message to
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21       data
22           pointer to the data to send
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24       len
25           length in bytes of the data to send
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27       actual_length
28           pointer to a location to put the actual length transferred in bytes
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30       timeout
31           time in msecs to wait for the message to complete before timing out
32           (if 0 the wait is forever)
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CONTEXT

35       !in_interrupt ()
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DESCRIPTION

38       This function sends a simple interrupt message to a specified endpoint
39       and waits for the message to complete, or timeout.
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41       Don't use this function from within an interrupt context. If you need
42       an asynchronous message, or need to send a message from within
43       interrupt context, use usb_submit_urb If a thread in your driver uses
44       this call, make sure your disconnect method can wait for it to
45       complete. Since you don't have a handle on the URB used, you can't
46       cancel the request.
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RETURN

49       If successful, 0. Otherwise a negative error number. The number of
50       actual bytes transferred will be stored in the actual_length parameter.
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53Kernel Hackers Manual 3.10         June 2019              USB_INTERRUPT_MSG(9)
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