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><SPAN
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>usb_control_msg</SPAN
></SPAN
></H1
><DIV
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><A
NAME="AEN12609"
></A
><H2
>Name</H2
>usb_control_msg -- Builds a control urb, sends it off and waits for completion
</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
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><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
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NAME="AEN12614"
></A
><P
></P
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <TT
CLASS="FUNCTION"
>usb_control_msg </TT
></CODE
>(struct usb_device * <TT
CLASS="PARAMETER"
><I
>dev</I
></TT
>, unsigned int <TT
CLASS="PARAMETER"
><I
>pipe</I
></TT
>, __u8 <TT
CLASS="PARAMETER"
><I
>request</I
></TT
>, __u8 <TT
CLASS="PARAMETER"
><I
>requesttype</I
></TT
>, __u16 <TT
CLASS="PARAMETER"
><I
>value</I
></TT
>, __u16 <TT
CLASS="PARAMETER"
><I
>index</I
></TT
>, void * <TT
CLASS="PARAMETER"
><I
>data</I
></TT
>, __u16 <TT
CLASS="PARAMETER"
><I
>size</I
></TT
>, int <TT
CLASS="PARAMETER"
><I
>timeout</I
></TT
>);</CODE
></P
><P
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><A
NAME="AEN12636"
></A
><H2
>Arguments</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="PARAMETER"
><I
>dev</I
></TT
></DT
><DD
><P
> pointer to the usb device to send the message to
</P
></DD
><DT
><TT
CLASS="PARAMETER"
><I
>pipe</I
></TT
></DT
><DD
><P
> endpoint <SPAN
CLASS="QUOTE"
>"pipe"</SPAN
> to send the message to
</P
></DD
><DT
><TT
CLASS="PARAMETER"
><I
>request</I
></TT
></DT
><DD
><P
> USB message request value
</P
></DD
><DT
><TT
CLASS="PARAMETER"
><I
>requesttype</I
></TT
></DT
><DD
><P
> USB message request type value
</P
></DD
><DT
><TT
CLASS="PARAMETER"
><I
>value</I
></TT
></DT
><DD
><P
> USB message value
</P
></DD
><DT
><TT
CLASS="PARAMETER"
><I
>index</I
></TT
></DT
><DD
><P
> USB message index value
</P
></DD
><DT
><TT
CLASS="PARAMETER"
><I
>data</I
></TT
></DT
><DD
><P
> pointer to the data to send
</P
></DD
><DT
><TT
CLASS="PARAMETER"
><I
>size</I
></TT
></DT
><DD
><P
> length in bytes of the data to send
</P
></DD
><DT
><TT
CLASS="PARAMETER"
><I
>timeout</I
></TT
></DT
><DD
><P
> time to wait for the message to complete before timing out (if 0 the wait is forever)
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN12685"
></A
><H2
>Description</H2
><P
> This function sends a simple control message to a specified endpoint
and waits for the message to complete, or timeout.
</P
><P
> If successful, it returns 0, othwise a negative error number.
</P
><P
> 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 <TT
CLASS="FUNCTION"
>usb_submit_urb</TT
>
</P
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