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

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Date:	Mon, 02 Sep 2013 20:40:47 -0500
From:	Daniel Santos <danielfsantos@....net>
To:	Greg KH <gregkh@...uxfoundation.org>
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 09/02/2013 06:07 PM, Greg KH wrote:
> 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 for your response! I haven't been able to find these drivers, can 
you please point me to one? I guess I don't know the "spi stack" well 
enough to know how to propagate that notification up to the driver for 
the spi device (let alone that it was called a "stack" :)

Thanks!!
Daniel
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