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Message-ID: <0bc7e884-fb62-4f75-b826-adaf96a98314@redhat.com>
Date: Thu, 6 Feb 2025 16:44:39 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Kate Hsuan <hpa@...hat.com>
Cc: Jiri Kosina <jikos@...nel.org>, Benjamin Tissoires <bentiss@...nel.org>,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] hid: hid-lg-g15: Use standard multicolor LED API
Hi Kate,
On 31-Jan-25 3:02 PM, Kate Hsuan wrote:
> Replace the custom "color" sysfs attribute with the standard multicolor
> LED API.
>
> This also removes the code for the custom "color" sysfs attribute,
> the "color" sysfs attribute was never documented so hopefully, it is not
> used by anyone.
>
> If we get complaints, we can re-add the "color" sysfs attribute as
> a compatibility wrapper setting the subleds intensity.
>
> Signed-off-by: Kate Hsuan <hpa@...hat.com>
> ---
> Changes in v2:
> 1. The commit message was revised with the reviewer's suggestions.
> 2. The incorrect parameters for container_of() were fixed.
> 3. The brightness values were converted by led_mc_calc_color_components().
Thanks, this v2 looks good to me:
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Regards,
Hans
> ---
> drivers/hid/hid-lg-g15.c | 146 +++++++++++++++++----------------------
> 1 file changed, 65 insertions(+), 81 deletions(-)
>
> diff --git a/drivers/hid/hid-lg-g15.c b/drivers/hid/hid-lg-g15.c
> index 53e7b90f9cc3..f8605656257b 100644
> --- a/drivers/hid/hid-lg-g15.c
> +++ b/drivers/hid/hid-lg-g15.c
> @@ -8,11 +8,13 @@
> #include <linux/device.h>
> #include <linux/hid.h>
> #include <linux/leds.h>
> +#include <linux/led-class-multicolor.h>
> #include <linux/module.h>
> #include <linux/random.h>
> #include <linux/sched.h>
> #include <linux/usb.h>
> #include <linux/wait.h>
> +#include <dt-bindings/leds/common.h>
>
> #include "hid-ids.h"
>
> @@ -44,9 +46,13 @@ enum lg_g15_led_type {
> };
>
> struct lg_g15_led {
> - struct led_classdev cdev;
> + union {
> + struct led_classdev cdev;
> + struct led_classdev_mc mcdev;
> + };
> enum led_brightness brightness;
> enum lg_g15_led_type led;
> + /* Used to store initial color intensities before subled_info is allocated */
> u8 red, green, blue;
> };
>
> @@ -229,15 +235,15 @@ static int lg_g510_kbd_led_write(struct lg_g15_data *g15,
> struct lg_g15_led *g15_led,
> enum led_brightness brightness)
> {
> + struct mc_subled *subleds = g15_led->mcdev.subled_info;
> int ret;
>
> + led_mc_calc_color_components(&g15_led->mcdev, brightness);
> +
> g15->transfer_buf[0] = 5 + g15_led->led;
> - g15->transfer_buf[1] =
> - DIV_ROUND_CLOSEST(g15_led->red * brightness, 255);
> - g15->transfer_buf[2] =
> - DIV_ROUND_CLOSEST(g15_led->green * brightness, 255);
> - g15->transfer_buf[3] =
> - DIV_ROUND_CLOSEST(g15_led->blue * brightness, 255);
> + g15->transfer_buf[1] = subleds[0].brightness;
> + g15->transfer_buf[2] = subleds[1].brightness;
> + g15->transfer_buf[3] = subleds[2].brightness;
>
> ret = hid_hw_raw_request(g15->hdev,
> LG_G510_FEATURE_BACKLIGHT_RGB + g15_led->led,
> @@ -258,8 +264,9 @@ static int lg_g510_kbd_led_write(struct lg_g15_data *g15,
> static int lg_g510_kbd_led_set(struct led_classdev *led_cdev,
> enum led_brightness brightness)
> {
> + struct led_classdev_mc *mc = lcdev_to_mccdev(led_cdev);
> struct lg_g15_led *g15_led =
> - container_of(led_cdev, struct lg_g15_led, cdev);
> + container_of(mc, struct lg_g15_led, mcdev);
> struct lg_g15_data *g15 = dev_get_drvdata(led_cdev->dev->parent);
> int ret;
>
> @@ -276,82 +283,20 @@ static int lg_g510_kbd_led_set(struct led_classdev *led_cdev,
>
> static enum led_brightness lg_g510_kbd_led_get(struct led_classdev *led_cdev)
> {
> + struct led_classdev_mc *mc = lcdev_to_mccdev(led_cdev);
> struct lg_g15_led *g15_led =
> - container_of(led_cdev, struct lg_g15_led, cdev);
> + container_of(mc, struct lg_g15_led, mcdev);
>
> return g15_led->brightness;
> }
>
> -static ssize_t color_store(struct device *dev, struct device_attribute *attr,
> - const char *buf, size_t count)
> -{
> - struct led_classdev *led_cdev = dev_get_drvdata(dev);
> - struct lg_g15_led *g15_led =
> - container_of(led_cdev, struct lg_g15_led, cdev);
> - struct lg_g15_data *g15 = dev_get_drvdata(led_cdev->dev->parent);
> - unsigned long value;
> - int ret;
> -
> - if (count < 7 || (count == 8 && buf[7] != '\n') || count > 8)
> - return -EINVAL;
> -
> - if (buf[0] != '#')
> - return -EINVAL;
> -
> - ret = kstrtoul(buf + 1, 16, &value);
> - if (ret)
> - return ret;
> -
> - mutex_lock(&g15->mutex);
> - g15_led->red = (value & 0xff0000) >> 16;
> - g15_led->green = (value & 0x00ff00) >> 8;
> - g15_led->blue = (value & 0x0000ff);
> - ret = lg_g510_kbd_led_write(g15, g15_led, g15_led->brightness);
> - mutex_unlock(&g15->mutex);
> -
> - return (ret < 0) ? ret : count;
> -}
> -
> -static ssize_t color_show(struct device *dev, struct device_attribute *attr,
> - char *buf)
> -{
> - struct led_classdev *led_cdev = dev_get_drvdata(dev);
> - struct lg_g15_led *g15_led =
> - container_of(led_cdev, struct lg_g15_led, cdev);
> - struct lg_g15_data *g15 = dev_get_drvdata(led_cdev->dev->parent);
> - ssize_t ret;
> -
> - mutex_lock(&g15->mutex);
> - ret = sprintf(buf, "#%02x%02x%02x\n",
> - g15_led->red, g15_led->green, g15_led->blue);
> - mutex_unlock(&g15->mutex);
> -
> - return ret;
> -}
> -
> -static DEVICE_ATTR_RW(color);
> -
> -static struct attribute *lg_g510_kbd_led_attrs[] = {
> - &dev_attr_color.attr,
> - NULL,
> -};
> -
> -static const struct attribute_group lg_g510_kbd_led_group = {
> - .attrs = lg_g510_kbd_led_attrs,
> -};
> -
> -static const struct attribute_group *lg_g510_kbd_led_groups[] = {
> - &lg_g510_kbd_led_group,
> - NULL,
> -};
> -
> static void lg_g510_leds_sync_work(struct work_struct *work)
> {
> struct lg_g15_data *g15 = container_of(work, struct lg_g15_data, work);
> + struct lg_g15_led *g15_led = &g15->leds[LG_G15_KBD_BRIGHTNESS];
>
> mutex_lock(&g15->mutex);
> - lg_g510_kbd_led_write(g15, &g15->leds[LG_G15_KBD_BRIGHTNESS],
> - g15->leds[LG_G15_KBD_BRIGHTNESS].brightness);
> + lg_g510_kbd_led_write(g15, g15_led, g15_led->brightness);
> mutex_unlock(&g15->mutex);
> }
>
> @@ -667,8 +612,46 @@ static void lg_g15_input_close(struct input_dev *dev)
> hid_hw_close(hdev);
> }
>
> +static void lg_g15_setup_led_rgb(struct lg_g15_data *g15, int index)
> +{
> + int i;
> + struct mc_subled *subled_info;
> +
> + g15->leds[index].mcdev.led_cdev.brightness_set_blocking =
> + lg_g510_kbd_led_set;
> + g15->leds[index].mcdev.led_cdev.brightness_get =
> + lg_g510_kbd_led_get;
> + g15->leds[index].mcdev.led_cdev.max_brightness = 255;
> + g15->leds[index].mcdev.num_colors = 3;
> +
> + subled_info = devm_kcalloc(&g15->hdev->dev, 3, sizeof(*subled_info), GFP_KERNEL);
> + if (!subled_info)
> + return;
> +
> + for (i = 0; i < 3; i++) {
> + switch (i + 1) {
> + case LED_COLOR_ID_RED:
> + subled_info[i].color_index = LED_COLOR_ID_RED;
> + subled_info[i].intensity = g15->leds[index].red;
> + break;
> + case LED_COLOR_ID_GREEN:
> + subled_info[i].color_index = LED_COLOR_ID_GREEN;
> + subled_info[i].intensity = g15->leds[index].green;
> + break;
> + case LED_COLOR_ID_BLUE:
> + subled_info[i].color_index = LED_COLOR_ID_BLUE;
> + subled_info[i].intensity = g15->leds[index].blue;
> + break;
> + }
> + subled_info[i].channel = i;
> + }
> + g15->leds[index].mcdev.subled_info = subled_info;
> +}
> +
> static int lg_g15_register_led(struct lg_g15_data *g15, int i, const char *name)
> {
> + int ret;
> +
> g15->leds[i].led = i;
> g15->leds[i].cdev.name = name;
>
> @@ -685,6 +668,7 @@ static int lg_g15_register_led(struct lg_g15_data *g15, int i, const char *name)
> } else {
> g15->leds[i].cdev.max_brightness = 1;
> }
> + ret = devm_led_classdev_register(&g15->hdev->dev, &g15->leds[i].cdev);
> break;
> case LG_G510:
> case LG_G510_USB_AUDIO:
> @@ -697,12 +681,11 @@ static int lg_g15_register_led(struct lg_g15_data *g15, int i, const char *name)
> g15->leds[i].cdev.name = "g15::power_on_backlight_val";
> fallthrough;
> case LG_G15_KBD_BRIGHTNESS:
> - g15->leds[i].cdev.brightness_set_blocking =
> - lg_g510_kbd_led_set;
> - g15->leds[i].cdev.brightness_get =
> - lg_g510_kbd_led_get;
> - g15->leds[i].cdev.max_brightness = 255;
> - g15->leds[i].cdev.groups = lg_g510_kbd_led_groups;
> + /* register multicolor LED */
> + lg_g15_setup_led_rgb(g15, i);
> + ret = devm_led_classdev_multicolor_register_ext(&g15->hdev->dev,
> + &g15->leds[i].mcdev,
> + NULL);
> break;
> default:
> g15->leds[i].cdev.brightness_set_blocking =
> @@ -710,11 +693,12 @@ static int lg_g15_register_led(struct lg_g15_data *g15, int i, const char *name)
> g15->leds[i].cdev.brightness_get =
> lg_g510_mkey_led_get;
> g15->leds[i].cdev.max_brightness = 1;
> + ret = devm_led_classdev_register(&g15->hdev->dev, &g15->leds[i].cdev);
> }
> break;
> }
>
> - return devm_led_classdev_register(&g15->hdev->dev, &g15->leds[i].cdev);
> + return ret;
> }
>
> /* Common input device init code shared between keyboards and Z-10 speaker handling */
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