linux-kernel - Re: [PATCH] leds: Add Chrome OS keyboard backlight LEDs driver

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Message-ID: <56D9F63C.5030608@gmail.com>
Date:	Fri, 4 Mar 2016 21:55:24 +0100
From:	Jacek Anaszewski <jacek.anaszewski@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jacek Anaszewski <j.anaszewski@...sung.com>
Cc:	Evan McClain <aeroevan@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Bryan Wu <cooloney@...il.com>, Simon Que <sque@...omium.org>,
	Olof Johansson <olofj@...omium.org>,
	Duncan Laurie <dlaurie@...omium.org>,
	Guenter Roeck <groeck@...omium.org>,
	linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH] leds: Add Chrome OS keyboard backlight LEDs driver

On 03/04/2016 08:13 PM, Dmitry Torokhov wrote:
> On Fri, Mar 04, 2016 at 10:38:40AM +0100, Jacek Anaszewski wrote:
>> Hi Evan,
>>
>> On 03/04/2016 09:38 AM, Evan McClain wrote:
>>> On Thu, 2016-03-03 at 15:46 -0800, Dmitry Torokhov wrote:
>>>> From: Simon Que <sque@...omium.org>
>>>>
>>>> This is a driver for ACPI-based keyboard backlight LEDs found on
>>>> Chromebooks. The driver locates \\_SB.KBLT ACPI device and exports
>>>> backlight as "chromeos::kbd_backlight" LED class device in sysfs.
>>>
>>> Was it ever decided where this driver should live? I was planning on
>>> submitting to platform/chrome since most keyboard backlights seem to
>>> live over there but I don't think I got a response.
>>>
>>
>> It hasn't been decided yet. I can take it, but could you submit one more
>> version, without
>>
>> 'owner	= THIS_MODULE' in struct platform_driver keyboard_led_driver ?
>>
>> It is redundant, because the core will do it.
>>
>> Also the line with devm_kzalloc has over 80 characters.
>
> Also:
>
> - preferably use sizeof(*cdev) instead of sizeof(struct ...)
> - do not check cdev->flags & LED_SUSPENDED in
>    keyboard_led_set_brightness() as it is not going to be called when led
>    device is suspended anyway
> - change the MODULE_LICENSE from "GPL v2" to "GPL" as to match the

I can see "either version 2 of the License" in the license notice.

>    actual license notice
> - report ACPI errors in error messages (since we clobber them)
> - preferably use ENXIO instead of ENODEV
> - maybe add "depends on CHROME_PLATFORMS || COMPILE_TEST" so that we do
>    not prompt for it on non-Chrome platforms

I agree with the remaining items.

-- 
Best Regards,
Jacek Anaszewski