linux-kernel - Re: ad714x driver help and possible bug

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Message-Id: <8EAE2AA4-C5A9-411C-B7E9-BB74C0716421@gmail.com>
Date:	Mon, 2 May 2011 16:43:18 -0400
From:	Jean-Francois Dagenais <jeff.dagenais@...il.com>
To:	Michael Hennerich <michael.hennerich@...log.com>
Cc:	Jonathan Cameron <jic23@....ac.uk>, Barry Song <21cnbao@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"device-drivers-devel@...ckfin.uclinux.org" 
	<device-drivers-devel@...ckfin.uclinux.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>
Subject: Re: ad714x driver help and possible bug


On Apr 29, 2011, at 10:58, Michael Hennerich wrote:

> On 04/29/2011 04:52 PM, Michael Hennerich wrote:
>> On 04/29/2011 11:55 AM, Jonathan Cameron wrote:
>>> Cc'd input, and analog devices driver list...
>>> 
>>> On 04/28/11 19:17, Jean-Francois Dagenais wrote:
>>> 
>>> 
>>>> I also had to change the request_threaded_irq flags to specify
>>>> IRQF_ONESHOT so the kernel keeps the interrupt masked while we are
>>>> running ad714x_interrupt_thread(). Otherwise we were getting storms
>>>> of interrupts each time only one was requested. I am wondering if
>>>> this should be pulled back to the mainline kernel?
>>>> 
>>>> Thanks for pointers and clues!
>>>> 
>>>> 
>> I assume this is due to the fact that the interrupt on the host is
>> level sensitive.
>> In this case you need to use the IRQF_ONESHOT flag.
>> The unmodified driver requests the IRQ as IRQF_TRIGGER_FALLING, so
>> this is not necessary.
I succeeded in making the ISR occur only once per real interrupt, the problem I explained earlier remains.
>> 
>> To my knowledge we regularly test the driver with the sliders, wheels
>> and buttons found on the
>> official evaluation board, and so far we haven't found oddities.
>> For an example platform file see: arch/blackfin/mach-bf537/boards/stamp.c
>> From top of my head I don't know whether we're testing with the SPI or
>> I2C interface.
>> 
>> http://wiki.analog.com/software/driver/linux/ad714x
>> 
> -- 
> 
> Greetings,
> Michael
> 
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