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

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Message-ID: <4DBAD21F.7040406@analog.com>
Date:	Fri, 29 Apr 2011 16:58:39 +0200
From:	Michael Hennerich <michael.hennerich@...log.com>
To:	Jean-Francois Dagenais <jeff.dagenais@...il.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 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.
>
> 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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