linux-kernel - Re: [RFC PATCH 0/2] managed token devres interfaces

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Date:	Wed, 09 Apr 2014 16:44:02 -0600
From:	Shuah Khan <shuah.kh@...sung.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	m.chehab@...sung.com, tj@...nel.org, rafael.j.wysocki@...el.com,
	linux@...ck-us.net, toshi.kani@...com,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	shuahkhan@...il.com, Shuah Khan <shuah.kh@...sung.com>
Subject: Re: [RFC PATCH 0/2] managed token devres interfaces

On 04/09/2014 01:17 PM, Greg KH wrote:
> On Wed, Apr 09, 2014 at 09:21:06AM -0600, Shuah Khan wrote:

>>
>> Test Cases for token devres interfaces: (passed)
>>   - Create, lock, unlock, and destroy sequence.
>>   - Try lock while it is locked. Returns -EBUSY as expected.
>>   - Try lock after destroy. Returns -ENODEV as expected.
>>   - Unlock while it is unlocked. Returns 0 as expected. This is a no-op.
>>   - Try unlock after destroy. Returns -ENODEV as expected.
>
> Any chance you can add these "test cases" as part of the kernel code so
> it lives here for any future changes?

Yes. I am planning to add these test cases to the kernel to serve as 
regression tests when these interfaces change. I have to add these in a 
driver framework, i.e I might need to create dummy driver perhaps. I 
haven't given it much thought on how, but I do plan to add tests.

>
>> Special notes for Mauro Chehab:
>>   - Please evaluate if these token devres interfaces cover all media driver
>>     use-cases. If not what is needed to cover them.
>>   - For use-case testing, I generated a string from em28xx device, as this
>>     is common for all em28xx extensions: (hope this holds true when em28xx
>>     uses snd-usb-audio
>>   - Construct string with (dev is struct em28xx *dev)
>> 		format: "tuner:%s-%s-%d"
>> 		with the following:
>>     	            dev_name(&dev->udev->dev)
>>                  dev->udev->bus->bus_name
>>                  dev->tuner_addr
>>   - I added test code to em28xx_card_setup() to test the interfaces:
>>     example token from this test code generated with the format above:
>
> What would the driver changes look like to take advantage of these new
> functions?
>

I am working on changes to em28xx driver to create and lock/unlock tuner 
token when it starts analog/digital video streaming. I should have a 
patch ready in a day or two.

thanks,
-- Shuah


-- 
Shuah Khan
Senior Linux Kernel Developer - Open Source Group
Samsung Research America(Silicon Valley)
shuah.kh@...sung.com | (970) 672-0658
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