linux-kernel - Re: [PATCH V2] misc : ROHM BH1780GLI Ambient light sensor Driver

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Date:	Tue, 01 Jun 2010 21:45:10 +0100
From:	Jonathan Cameron <kernel@...23.retrosnub.co.uk>
To:	Daniel Mack <daniel@...aq.de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Hemanth V <hemanthv@...com>, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, Jonathan Cameron <jic23@....ac.uk>,
	Wolfram Sang <w.sang@...gutronix.de>
Subject: Re: [PATCH V2] misc : ROHM BH1780GLI Ambient light sensor Driver

On 06/01/10 21:27, Daniel Mack wrote:
> On Tue, Jun 01, 2010 at 01:12:44PM -0700, Andrew Morton wrote:
>> On Mon, 24 May 2010 16:34:25 +0530 (IST)
>> "Hemanth V" <hemanthv@...com> wrote:
>>
>>> This patch adds support for ROHM BH1780GLI Ambient light sensor.
>>>
>>> BH1780 supports I2C interface. Driver supports read/update of power state and
>>> read of lux value (through SYSFS). Writing value 3 to power_state enables the
>>> sensor and current lux value could be read.
>>
>> There are at least two other ambient light sensor drivers:
>> drivers/misc/isl29003.c and drivers/misc/tsl2550.c.
>>
>> Is there any standardisation of the ABIs whcih these drivers offer?  If
>> so, does this new driver comply with that?
> 
> Jonathan proposed the ALS framework for these type of devices, but it
> was rejected (don't know about the reasons, I didn't follow the
> discussions).
Ah the wonder of emails crossing ;)

For the interested... http://lkml.org/lkml/2010/3/1/367
(the main objections are Linus' email)
> The new idea is to put such drivers in the industrial IO
> subsystem, but I don't know how mature that approach is currently.
We haven't lifted any that didn't start there as moving things into staging
due to a dependency being there seemed a controversial thing to do.
> 
> For the time being, these drivers cook up whatever sysfs interface they
> like, and their userspace ABIs are not standardized, unfortunately.
> 
>> It would be most useful if the changelog were to fully describe the
>> proposed kernel<->userspace interface.  That's the most important part
>> of the driver, because it's the only part we can never change.
>>
>> There is a desultory effort to maintain sysfs API descriptions under
>> Documentation/ABI/.  I'd have thought that it would be appropriate to
>> document this driver's ABI in there.
> 
> FWIW, I put some documentation about the isl29003 to
> Documentation/misc-devices when I wrote the driver.
> 
> Daniel
> 
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