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SubjectRe: [PATCH v3 3/3] leds: trigger: implement a tty trigger
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On 12/17/19 10:08 PM, Uwe Kleine-König wrote:
> On Tue, Dec 17, 2019 at 09:27:13PM +0100, Jacek Anaszewski wrote:
>> On 12/17/19 6:21 PM, Greg Kroah-Hartman wrote:
>>> On Tue, Dec 17, 2019 at 05:23:13PM +0100, Uwe Kleine-König wrote:
>>>> On Tue, Dec 17, 2019 at 04:27:24PM +0100, Greg Kroah-Hartman wrote:
>>>>> On Tue, Dec 17, 2019 at 04:07:36PM +0100, Uwe Kleine-König wrote:
>>>>>> Usage is as follows:
>>>>>>
>>>>>> myled=ledname
>>>>>> tty=ttyS0
>>>>>>
>>>>>> echo tty > /sys/class/leds/$myled/trigger
>>>>>> cat /sys/class/tty/$tty/dev > /sys/class/leds/$myled/dev
>>>>>
>>>>> Is this the correct instructions? Aren't you looking for a major/minor
>>>>> number instead in your sysfs file?
>>>>
>>>> This is correct, yes, at least it works as intended on my machine.
>>>>
>>>> /sys/class/tty/$tty/dev produces $major:$minor and that's what the
>>>> led-trigger consumes.
>>>
>>> Ugh, nevermind, I totally read that wrong, I was thinking "echo" instead
>>> of cat. My fault, what you wrote is correct. Should that be documented
>>> somewhere in a Documentation/ABI/ file so that people know how to use
>>> this new sysfs file? How are led triggers documented?
>>
>> LED triggers have their corresponding entries in Documentation/ABI.
>>
>> Uwe, you already did that for netdev trigger:
>>
>> Documentation/ABI/testing/sysfs-class-led-trigger-netdev
>>
>> It would be nice to have one for this too.
>>
>> There are also less formal docs in Documentation/leds, e.g.:
>>
>> Documentation/leds/ledtrig-usbport.rst
>
> I'd put into Documentation/ABI/testing/sysfs-class-led-trigger-tty:
>
> What: /sys/class/leds/<led>/dev
> Date: Dec 2019
> KernelVersion: 5.6
> Contact: linux-leds@vger.kernel.org
> Description:
> Specifies $major:$minor of the triggering tty

Yes, that should be fine.

--
Best regards,
Jacek Anaszewski

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