linux-kernel - Re: [RFC PATCH RESEND 2/3] leds: upboard: Add LED support

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Date:   Wed, 25 Apr 2018 08:41:33 +0200
From:   Pavel Machek <pavel@....cz>
To:     Javier Arteaga <javier@...tex.com>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Dan O'Donovan <dan@...tex.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Lee Jones <lee.jones@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH RESEND 2/3] leds: upboard: Add LED support

On Sat 2018-04-21 09:50:08, Javier Arteaga wrote:
> Allow userspace to use the on-board LEDs as "upboard:<color>:".
> 
> Signed-off-by: Javier Arteaga <javier@...tex.com>

> +static enum led_brightness upboard_led_brightness_get(struct led_classdev *cdev)
> +{
> +	struct upboard_led *led = container_of(cdev, struct upboard_led, cdev);
> +	int brightness = 0;
> +
> +	regmap_field_read(led->field, &brightness);
> +
> +	return brightness;
> +};

I'm slightly confused here. Is each led controlled by single bit?

> +static void upboard_led_brightness_set(struct led_classdev *cdev,
> +				       enum led_brightness brightness)
> +{
> +	struct upboard_led *led = container_of(cdev, struct upboard_led, cdev);
> +
> +	regmap_field_write(led->field, brightness != LED_OFF);
> +};

What is going on with ";" at end of function? We don't do that.

If it is single bit, max_brightness should be one, and != LED_OFF test
should not be needed.

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

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