linux-kernel - Re: [PATCH v3 1/2] leds: mt6360: Add LED driver for MT6360

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Date:   Thu, 10 Sep 2020 14:29:58 +0200
From:   Pavel Machek <pavel@....cz>
To:     Gene Chen <gene.chen.richtek@...il.com>
Cc:     jacek.anaszewski@...il.com, robh+dt@...nel.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        Dan Murphy <dmurphy@...com>, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Gene Chen <gene_chen@...htek.com>, Wilma.Wu@...iatek.com,
        shufan_lee@...htek.com, cy_huang@...htek.com,
        benjamin.chao@...iatek.com
Subject: Re: [PATCH v3 1/2] leds: mt6360: Add LED driver for MT6360

Hi!

> > > +{
> > > +     struct mt6360_led *led = container_of(lcdev, struct mt6360_led, flash.led_cdev);
> > > +     struct mt6360_priv *priv = led->priv;
> > > +     u32 enable_mask = MT6360_TORCHEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
> > > +     u32 val = (level) ? MT6360_FLCSEN_MASK(led->led_no) : 0;
> > > +     u32 prev = priv->fled_torch_used, curr;
> > > +     int ret;
> > > +
> > > +     dev_dbg(lcdev->dev, "[%d] brightness %d\n", led->led_no, level);
> > > +     if (priv->fled_strobe_used) {
> > > +             dev_warn(lcdev->dev, "Please disable strobe first [%d]\n", priv->fled_strobe_used);
> > > +             return -EINVAL;
> > > +     }
> >
> > So... how does its userland interface look like?
> >
> 
> 1. set FLED1 brightness
> # echo 1 > /sys/class/leds/white:flash1/flash_brightness
> 2. enable FLED1 strobe
> # echo 1 > /sys/class/leds/white:flash1/flash_strobe
> 3 . turn off FLED1 strobe (just used to gaurantee the strobe mode
> flash leds must be turned off)
> # echo 0 > /sys/class/leds/white:flash1/flash_strobe

I believe I'd preffer only exposing torch functionality in
/sys/class/leds. .. strobe can be supported using v4l2 APIs.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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