From: jacek.anaszewski@gmail.com (Jacek Anaszewski)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Creating sysfs brightness for every led channels
Date: Wed, 7 Sep 2016 22:27:21 +0200 [thread overview]
Message-ID: <094425d1-4e0f-f702-4d57-94c21ca75217@gmail.com> (raw)
In-Reply-To: <CAEwN+MAKgvtdB-tgoxzwAZgUk9rUp+YFaCY7qbKk4sg87zdDYQ@mail.gmail.com>
Hi Raul,
On 09/05/2016 08:32 PM, Raul Piper wrote:
> Hi,
> I am trying to send the brightness value ( for 5 channels) by
> echo "val1val2val3val4val5" > brightness ,
How did you infer this format?
Please get acquainted with Documentation/leds/leds-class.txt
and Documentation/ABI/testing/sysfs-class-led.
> But seems like even if I change the brightness type to enum or int in
> my driver ,I will never be able to send the brightness string because
> led class defines the brightness value as enum.
One LED class device can control one channel.
>
> extern void led_set_brightness(struct led_classdev *led_cdev,
> enum led_brightness brightness);
>
> Only possible way I am finding is to create attributes for each
> channel like brightness,default trigger,max_brightness and any user
> defined attributes, but i am not getting how to do this.
> Can some on please comment or post the link to the example driver.
> Do i have to call led_class_register for every channel and I have to
> define every channel in the device tree?
Just grep through drivers/leds and Documentation/devicetree/bindings/leds/.
--
Best regards,
Jacek Anaszewski
next prev parent reply other threads:[~2016-09-07 20:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-05 18:32 Creating sysfs brightness for every led channels Raul Piper
2016-09-07 20:27 ` Jacek Anaszewski [this message]
2016-09-08 10:56 ` Raul Piper
2016-09-08 19:17 ` Jacek Anaszewski
-- strict thread matches above, loose matches on Subject: below --
2016-09-05 18:27 Raul Piper
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=094425d1-4e0f-f702-4d57-94c21ca75217@gmail.com \
--to=jacek.anaszewski@gmail.com \
--cc=kernelnewbies@lists.kernelnewbies.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).