linux-kernel - Re: RESEND: Generating interrupts from a USB device driver?

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Date:	Mon, 2 Sep 2013 16:07:38 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Daniel Santos <daniel.santos@...ox.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-gpio <linux-gpio@...r.kernel.org>,
	linux-usb <linux-usb@...r.kernel.org>,
	linux-spi <linux-spi@...r.kernel.org>
Subject: Re: RESEND: Generating interrupts from a USB device driver?

On Mon, Sep 02, 2013 at 05:46:58PM -0500, Daniel Santos wrote:
> Hello guys.  I didn't get a response the last time so hopefully with 
> 3.11 out I'll get one this time.
> 
> I need to be able to generate interrupts from a USB device driver while 
> servicing the complete() function of an interrupt URB.

No you don't :)

> While I realize that this may seem strange, the purpose is for a USB
> to SPI/GPIO bridge chip (the MCP2210). When something happens on the
> remote device where a chip is expecting it's interrupt out pin to
> trigger an interrupt on some local (to the board) microcontroller, the
> MCP2210 instead receives that signal and communicates it to the host
> the next time it's queried. This is the interrupt that I need to, in
> effect propagate locally. Since my spi_master and gpio_chip are all
> functioning now, this is the last step to get one of my spi protocol
> drivers working correctly.

Just pass the data up the spi stack in your interrupt endpoint handler.
No need to try to create a "real" interrupt.  There are other USB SPI
drivers that should give you the idea of how to do it.

thanks,

greg k-h
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