Re: [PATCH 05/15] HID: hid-oxp: fix multicolor LED intensity scaling

["Derek J. Clark" <derekjohn.clark@gmail.com>]

On 9/9/26 20:21, Andrei Aldea wrote:
> The controller accepts eight-bit RGB components, but the sub-LED channel
> maximum currently inherits the 0-100 overall brightness range. This
> prevents userspace from selecting channel intensities above 100.
>
> Set each channel maximum to 255 and use the multicolor LED core helper to
> scale components with the requested brightness. This also replaces the
> private truncating calculation with the LED core's rounded calculation.
>
> Keep the existing Gen1 and Gen2 color packet layouts unchanged.
>
> Fixes: 84910c459d65 ("HID: hid-oxp: Add OneXPlayer configuration driver")
> Assisted-by: LLM
> Reviewed-by: Derek J. Clark <derekjohn.clark@gmail.com>
> Signed-off-by: Andrei Aldea <andrei1998@gmail.com>
> ---
>   drivers/hid/hid-oxp.c | 11 +++++++----
>   1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/hid/hid-oxp.c b/drivers/hid/hid-oxp.c
> index c3cfa95..bee1317 100644
> --- a/drivers/hid/hid-oxp.c
> +++ b/drivers/hid/hid-oxp.c
> @@ -1088,7 +1088,6 @@ static ssize_t oxp_rgb_status_show(void)
>   
>   static int oxp_rgb_color_set(void)
>   {
> -	u8 max_br = drvdata.led_mc->led_cdev.max_brightness;
>   	u8 br = drvdata.led_mc->led_cdev.brightness;
>   	u16 up = get_usage_page(drvdata.hdev);
>   	u8 green, red, blue;
> @@ -1096,9 +1095,10 @@ static int oxp_rgb_color_set(void)
>   	u8 *data;
>   	int i;
>   
> -	red = br * drvdata.led_mc->subled_info[0].intensity / max_br;
> -	green = br * drvdata.led_mc->subled_info[1].intensity / max_br;
> -	blue = br * drvdata.led_mc->subled_info[2].intensity / max_br;
> +	led_mc_calc_color_components(drvdata.led_mc, br);
> +	red = drvdata.led_mc->subled_info[0].brightness;
> +	green = drvdata.led_mc->subled_info[1].brightness;
> +	blue = drvdata.led_mc->subled_info[2].brightness;
>   
>   	switch (up) {
>   	case GEN1_USAGE_PAGE:
> @@ -1383,16 +1383,19 @@ static struct mc_subled oxp_rgb_subled_info[] = {
>   	{
>   		.color_index = LED_COLOR_ID_RED,
>   		.intensity = 0x24,
> +		.max_intensity = 0xff,
>   		.channel = 0x1,
>   	},
>   	{
>   		.color_index = LED_COLOR_ID_GREEN,
>   		.intensity = 0x22,
> +		.max_intensity = 0xff,
>   		.channel = 0x2,
>   	},
>   	{
>   		.color_index = LED_COLOR_ID_BLUE,
>   		.intensity = 0x99,
> +		.max_intensity = 0xff,
>   		.channel = 0x3,
>   	},
>   };

Tested-by: Derek J. Clark <derekjohn.clark@gmail.com>
Reviewed-by: Derek J. Clark <derekjohn.clark@gmail.com>