linux-kernel - Re: [PATCH] HID: logitech-hidpp: support Color LED feature (8071).

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Date:   Wed, 23 Mar 2022 22:04:23 +0100
From:   Pavel Machek <pavel@....cz>
To:     Manuel Schönlaub <manuel.schoenlaub@...il.com>
Cc:     lains@...eup.net, jikos@...nel.org, benjamin.tissoires@...hat.com,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: logitech-hidpp: support Color LED feature (8071).

Hi!

> The HID++ protocol allows to set multicolor (RGB) to a static color.
> Multiple of such LED zones per device are supported.
> This patch exports said LEDs so that they can be set from userspace.
> 
> Signed-off-by: Manuel Schönlaub <manuel.schoenlaub@...il.com>

Please cc LEDs stuff to the LED lists.

> +static int hidpp_mc_led_register(struct hidpp_device *hidpp_dev,
> +				 struct led_classdev_mc *mc_dev,
> +				 int zone)
> +{
> +	struct hid_device *hdev = hidpp_dev->hid_dev;
> +	struct mc_subled *mc_led_info;
> +	struct led_classdev *cdev;
> +	int ret;
> +
> +	mc_led_info = devm_kmalloc_array(&hdev->dev, 3,
> +					 sizeof(*mc_led_info),
> +					 GFP_KERNEL | __GFP_ZERO);
> +	if (!mc_led_info)
> +		return -ENOMEM;
> +
> +	mc_led_info[0].color_index = LED_COLOR_ID_RED;
> +	mc_led_info[1].color_index = LED_COLOR_ID_GREEN;
> +	mc_led_info[2].color_index = LED_COLOR_ID_BLUE;
> +
> +	mc_dev->subled_info = mc_led_info;
> +	mc_dev->num_colors = 3;
> +
> +	cdev = &mc_dev->led_cdev;
> +	cdev->name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
> +				    "%s:rgb:indicator-%d", hdev->uniq, zone);

So this is keyboard backlight? We should add the documentation at the
very least, so that other drivers use same name.

Best regards,
								Pavel

-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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