linux-kernel - Re: [PATCH v5 RESEND 3/6] leds: core: Add led_mc_set

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Date: Sun, 24 Mar 2024 22:07:30 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Kate Hsuan <hpa@...hat.com>
Cc: Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>, linux-leds@...r.kernel.org, 
	platform-driver-x86@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>, 
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
	André Apitzsch <git@...tzsch.eu>, 
	linux-kernel@...r.kernel.org, Sebastian Reichel <sre@...nel.org>, linux-pm@...r.kernel.org
Subject: Re: [PATCH v5 RESEND 3/6] leds: core: Add led_mc_set_brightness() function

On Sun, Mar 24, 2024 at 5:02 PM Kate Hsuan <hpa@...hat.com> wrote:
>
> From: Hans de Goede <hdegoede@...hat.com>
>
> Add a new led_mc_set_brightness() function for in kernel color/brightness
> changing of multi-color LEDs.
>
> led-class-multicolor can be build as a module and led_mc_set_brightness()
> will have builtin callers, so put led_mc_set_brightness() inside led-core

the builtin

> instead, just like how led_set_brightness() is part of the core and not
> of the led-class object.
>
> This also adds a new LED_MULTI_COLOR led_classdev flag to allow
> led_mc_set_brightness() to verify that it is operating on a multi-color
> LED classdev, avoiding casting the passed in LED classdev to a multi-color
> LED classdev, when it actually is not a multi-color LED.

..

> +/*
> + * This is a led-core function because just like led_set_brightness()
> + * it is used in kernel by e.g. triggers.

in the kernel

> + */

..

> +       if (!(led_cdev->flags & LED_MULTI_COLOR)) {
> +               dev_err_once(led_cdev->dev, "%s: error not a multi-color LED\n",  __func__);

Not sure how __func__ helps here.

> +               return;
> +       }
> +
> +       mcled_cdev = lcdev_to_mccdev(led_cdev);
> +       if (num_colors != mcled_cdev->num_colors) {
> +               dev_err_once(led_cdev->dev, "%s: error num_colors mismatch %d != %d\n",

Should be '...%u != %u...'.

> +                            __func__, num_colors, mcled_cdev->num_colors);

Ditto about __func__.

> +               return;
> +       }

-- 
With Best Regards,
Andy Shevchenko