On Sun, 14 Jun 2026, Коненко Андрей Викторович wrote: > From: Edip Hazuri > > Add support for the HP keyboard RGB backlight found on HP OMEN and > HP Victus laptops. These keyboards expose per-zone RGB control through > WMI commands. > > Register multicolor LED class devices for each keyboard zone (up to 4 > zones, depending on the keyboard type). Each zone exposes individual > red, green, and blue channels via the multicolor LED subsystem. > > Also hardware-initiated brightness changes (e.g. via the keyboard > backlight hotkey, mostly fn+f4) are reported. > > The color data is stored in a 128-byte color table managed by the > firmware, with RGB values starting at offset 25, packed sequentially > per zone. > > Signed-off-by: Konenko Andrey Viktorovich > > --- > Changes since v9: > - Fixed corrupted long lines > - Fixed changelog > > Changes since v8: > - No changes (It was mistake to resend email without any fix) > > Changes since v7: > - The LED class device names changed to be consistent with the documentation. > > Changes since v6: > - The LED class device names have been made more consistent with the > documentation, in accordance with patch https://lore.kernel.org/linux-leds/ > 20260504145434.12746-1-johannes.goede@oss.qualcomm.com/ > underscores have been replaced with dashes where indicated. > > Changes since v5: > - LED class device names changed from a number to using a descriptive name > for each zone. > > v4: https://lore.kernel.org/all/20260303084022.7223-3-edip@medip.dev/ > > Changes since v4: > - Fix circular dependencies > > Changes since v3: > - Merge the changes into a single commit > > Changes since v1: > - Fix mentioned style errors > - Add Kconfig dependencies > > > --- > > diff --git a/drivers/platform/x86/hp/Kconfig b/drivers/platform/x86/hp/Kconfig > index dd51491b9bcd..2a1841cbec76 100644 > --- a/drivers/platform/x86/hp/Kconfig > +++ b/drivers/platform/x86/hp/Kconfig > @@ -45,6 +45,8 @@ config HP_WMI > select INPUT_SPARSEKMAP > select ACPI_PLATFORM_PROFILE > select HWMON > + select LEDS_CLASS > + select LEDS_CLASS_MULTICOLOR > help > Say Y here if you want to support WMI-based hotkeys on HP laptops and > to read data from WMI such as docking or ambient light sensor state. > diff --git a/drivers/platform/x86/hp/hp-wmi.c b/drivers/platform/x86/hp/hp-wmi.c > index d1cc6e7d176c..19da18f68337 100644 > --- a/drivers/platform/x86/hp/hp-wmi.c > +++ b/drivers/platform/x86/hp/hp-wmi.c > @@ -14,6 +14,7 @@ > #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt > > #include > +#include > #include > #include > #include > @@ -23,6 +24,8 @@ > #include > #include > #include > +#include > +#include > #include > #include > #include > @@ -57,6 +60,7 @@ enum hp_ec_offsets { > > #define HP_FAN_SPEED_AUTOMATIC 0x00 > #define HP_POWER_LIMIT_DEFAULT 0x00 > +#define HP_COLOR_TABLE_PADDING 25 > #define HP_POWER_LIMIT_NO_CHANGE 0xFF > > #define zero_if_sup(tmp) (zero_insize_support?0:sizeof(tmp)) // use when zero insize is required > @@ -97,6 +101,14 @@ enum hp_thermal_profile { > HP_THERMAL_PROFILE_QUIET = 0x03, > }; > > +enum hp_keyboard_type { > + HP_KEYBOARD_TYPE_NOBACKLIGHT = 0x0, > + HP_KEYBOARD_TYPE_FOURZONE_WITH_NUMPAD = 0x1, > + HP_KEYBOARD_TYPE_FOURZONE_WITHOUT_NUMPAD = 0x2, > + HP_KEYBOARD_TYPE_RGB_PER_KEY = 0x3, > + HP_KEYBOARD_TYPE_SINGLEZONE_WITH_NUMPAD = 0x4, > + HP_KEYBOARD_TYPE_SINGLEZONE_WITHOUT_NUMPAD = 0x5, > +}; > > struct thermal_profile_params { > u8 performance; > @@ -338,16 +350,27 @@ enum hp_wmi_gm_commandtype { > HPWMI_GET_GPU_THERMAL_MODES_QUERY = 0x21, > HPWMI_SET_GPU_THERMAL_MODES_QUERY = 0x22, > HPWMI_SET_POWER_LIMITS_QUERY = 0x29, > + HPWMI_GET_KEYBOARD_TYPE_QUERY = 0x2b, > HPWMI_VICTUS_S_FAN_SPEED_GET_QUERY = 0x2D, > HPWMI_VICTUS_S_FAN_SPEED_SET_QUERY = 0x2E, > HPWMI_VICTUS_S_GET_FAN_TABLE_QUERY = 0x2F, > }; > > +enum hp_wmi_backlight_commandtype { > + HPWMI_BACKLIGHT_COLOR_GET_QUERY = 0x02, > + HPWMI_BACKLIGHT_COLOR_SET_QUERY = 0x03, > + HPWMI_BACKLIGHT_BRIGHTNESS_GET_QUERY = 0x04, > + HPWMI_BACKLIGHT_BRIGHTNESS_SET_QUERY = 0x05, > + HPWMI_BACKLIGHT_SET_OFF_QUERY = 0x64, > + HPWMI_BACKLIGHT_SET_ON_QUERY = 0xE4, > +}; > + > enum hp_wmi_command { > HPWMI_READ = 0x01, > HPWMI_WRITE = 0x02, > HPWMI_ODM = 0x03, > HPWMI_GM = 0x20008, > + HPWMI_BACKLIGHT = 0x20009, > }; > > enum hp_wmi_hardware_mask { > @@ -355,6 +378,24 @@ enum hp_wmi_hardware_mask { > HPWMI_TABLET_MASK = 0x04, > }; > > +struct hp_kbd_led_priv { > + int zone; /* Zone index (0-3) */ > + enum led_brightness last_brightness; /* Brightness before turning off */ > +}; > + > +struct hp_mc_leds { > + struct led_classdev_mc devices[4]; > + struct hp_kbd_led_priv priv[4]; > +}; > + > +/* zone naming for 4-zone keyboards (HP Omen) */ > +static const char *const hp_zone_names_4[] = { > + [0] = "zoned_backlight-right", > + [1] = "zoned_backlight-center", > + [2] = "zoned_backlight-left", > + [3] = "zoned_backlight-wasd", > +}; > + > struct bios_return { > u32 sigpass; > u32 return_code; > @@ -435,6 +476,7 @@ static DEFINE_MUTEX(active_platform_profile_lock); > static struct input_dev *hp_wmi_input_dev; > static struct input_dev *camera_shutter_input_dev; > static struct platform_device *hp_wmi_platform_dev; > +static struct hp_mc_leds hp_multicolor_leds; > static struct device *platform_profile_device; > static struct notifier_block platform_power_source_nb; > static enum platform_profile_option active_platform_profile; > @@ -1122,6 +1164,8 @@ static struct attribute *hp_wmi_attrs[] = { > }; > ATTRIBUTE_GROUPS(hp_wmi); > > +static void hp_kbd_brightness_set_by_hwd(u32 event_data); > + > static void hp_wmi_notify(union acpi_object *obj, void *context) > { > u32 event_id, event_data; > @@ -1222,6 +1266,7 @@ static void hp_wmi_notify(union acpi_object *obj, void *context) > case HPWMI_PROXIMITY_SENSOR: > break; > case HPWMI_BACKLIT_KB_BRIGHTNESS: > + hp_kbd_brightness_set_by_hwd(event_data); > break; > case HPWMI_PEAKSHIFT_PERIOD: > break; > @@ -1484,6 +1529,241 @@ static int __init hp_wmi_rfkill2_setup(struct platform_device *device) > return err; > } > > +static struct hp_kbd_led_priv *hp_led_get_priv(struct led_classdev *led_cdev) > +{ > + struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(led_cdev); > + int zone = mc_cdev - hp_multicolor_leds.devices; > + > + return &hp_multicolor_leds.priv[zone]; > +} > + > +static int hp_kbd_backlight_set_rgb_color(int zone, int red, int green, int blue) > +{ > + u8 color_table[128]; > + int ret; > + > + /* > + * Get the current color table and then change only the relevant parts. > + */ > + ret = hp_wmi_perform_query(HPWMI_BACKLIGHT_COLOR_GET_QUERY, > + HPWMI_BACKLIGHT, color_table, > + zero_if_sup(color_table), > + sizeof(color_table)); > + if (ret) > + return ret; > + > + /* > + * RGB color data starts at offset 25 +3 per zone (r g b) > + * e.g. if zone 1 starts in 25 zone 2 starts in 28 > + */ > + color_table[HP_COLOR_TABLE_PADDING + zone * 3] = red; > + color_table[HP_COLOR_TABLE_PADDING + zone * 3 + 1] = green; > + color_table[HP_COLOR_TABLE_PADDING + zone * 3 + 2] = blue; > + > + ret = hp_wmi_perform_query(HPWMI_BACKLIGHT_COLOR_SET_QUERY, HPWMI_BACKLIGHT, > + color_table, sizeof(color_table), sizeof(color_table)); > + if (ret < 0) > + return ret; > + if (ret) > + return -EINVAL; > + > + return 0; > +} > + > +static bool hp_kbd_backlight_is_on(void) > +{ > + u8 data; > + int ret; > + > + ret = hp_wmi_perform_query(HPWMI_BACKLIGHT_BRIGHTNESS_GET_QUERY, HPWMI_BACKLIGHT, &data, > + sizeof(data), sizeof(data)); > + if (ret) > + return false; > + > + return data == HPWMI_BACKLIGHT_SET_ON_QUERY; > +} > + > +static int hp_kbd_set_brightness(struct led_classdev *led_cdev, > + enum led_brightness brightness) > +{ > + struct hp_kbd_led_priv *priv = hp_led_get_priv(led_cdev); > + struct led_classdev_mc *mc_cdev; > + struct led_classdev_mc *device; > + int red, green, blue; > + int ret; > + > + if (!hp_kbd_backlight_is_on()) { > + u8 data = HPWMI_BACKLIGHT_SET_ON_QUERY; > + > + ret = hp_wmi_perform_query(HPWMI_BACKLIGHT_BRIGHTNESS_SET_QUERY, > + HPWMI_BACKLIGHT, &data, > + sizeof(data), sizeof(data)); > + if (ret) > + return ret; > + > + /* > + * Turning the backlight on via WMI turns all zones, > + * so we need to restore the other zones' off state. > + */ > + for (int i = 0; i < ARRAY_SIZE(hp_multicolor_leds.devices); i++) { > + if (i == priv->zone) > + continue; > + > + device = &hp_multicolor_leds.devices[i]; > + if (!device->led_cdev.name) > + continue; > + hp_kbd_backlight_set_rgb_color(i, > + device->subled_info[0].brightness, > + device->subled_info[1].brightness, > + device->subled_info[2].brightness); > + } > + } > + > + led_cdev->brightness = brightness; > + > + mc_cdev = lcdev_to_mccdev(led_cdev); > + led_mc_calc_color_components(mc_cdev, brightness); > + > + red = mc_cdev->subled_info[0].brightness; > + green = mc_cdev->subled_info[1].brightness; > + blue = mc_cdev->subled_info[2].brightness; > + > + return hp_kbd_backlight_set_rgb_color(priv->zone, red, green, blue); > +} > + > +static void hp_kbd_brightness_set_by_hwd(u32 event_data) > +{ > + struct device *dev = &hp_wmi_platform_dev->dev; > + struct led_classdev *led_cdev; > + struct hp_kbd_led_priv *priv; > + u8 brightness; > + > + for (int zone = 0; zone < ARRAY_SIZE(hp_multicolor_leds.devices); zone++) { > + if (!hp_multicolor_leds.devices[zone].led_cdev.name) > + continue; > + > + led_cdev = &hp_multicolor_leds.devices[zone].led_cdev; > + if (!led_cdev->dev) > + continue; > + > + priv = hp_led_get_priv(led_cdev); > + > + if (event_data == 0x2) { > + brightness = priv->last_brightness ? : LED_FULL; > + } else if (event_data == 0x0) { Instead of literals, can these two be named with defines? It would also seem like switch/case is more appropriate construct here that if/else forest. > + priv->last_brightness = led_cdev->brightness; > + brightness = LED_OFF; > + } else { > + dev_warn(dev, "Unknown keyboard backlight event - 0x%x\n", > + event_data); > + return; > + } > + > + led_cdev->brightness = brightness; > + led_classdev_notify_brightness_hw_changed(led_cdev, brightness); > + } > +} > + > +static int __init hp_mc_leds_register(int num_zones) > +{ > + u8 color_table[128]; > + int ret; > + > + ret = hp_wmi_perform_query(HPWMI_BACKLIGHT_COLOR_GET_QUERY, HPWMI_BACKLIGHT, > + color_table, zero_if_sup(color_table), > + sizeof(color_table)); > + if (ret) > + return ret; > + > + for (int zone = 0; zone < num_zones; zone++) { > + struct led_classdev_mc *multicolor_led_dev; > + struct led_classdev *led_cdev; > + struct mc_subled *mc_subled_info; > + struct hp_kbd_led_priv *priv; > + struct device *dev; > + > + dev = &hp_wmi_platform_dev->dev; > + multicolor_led_dev = &hp_multicolor_leds.devices[zone]; > + led_cdev = &multicolor_led_dev->led_cdev; > + priv = &hp_multicolor_leds.priv[zone]; > + > + if (num_zones == 1) > + led_cdev->name = devm_kasprintf(dev, GFP_KERNEL, > + "hp::kbd_backlight"); > + else if (num_zones == 4 && zone < ARRAY_SIZE(hp_zone_names_4)) > + led_cdev->name = devm_kasprintf(dev, GFP_KERNEL, > + "hp::kbd_%s", > + hp_zone_names_4[zone]); > + else if (num_zones > 1) > + led_cdev->name = devm_kasprintf(dev, GFP_KERNEL, > + "hp::kbd_zoned_backlight-%d", > + zone); > + > + if (!led_cdev->name) > + return -ENOMEM; > + led_cdev->brightness = hp_kbd_backlight_is_on() ? > + LED_FULL : LED_OFF; > + led_cdev->max_brightness = LED_FULL; > + led_cdev->brightness_set_blocking = hp_kbd_set_brightness; > + led_cdev->flags = LED_CORE_SUSPENDRESUME | > + LED_RETAIN_AT_SHUTDOWN | > + LED_BRIGHT_HW_CHANGED; > + > + mc_subled_info = devm_kzalloc(dev, sizeof(*mc_subled_info) * 3, > + GFP_KERNEL); > + if (!mc_subled_info) > + return -ENOMEM; > + > + mc_subled_info[0].color_index = LED_COLOR_ID_RED; > + mc_subled_info[1].color_index = LED_COLOR_ID_GREEN; > + mc_subled_info[2].color_index = LED_COLOR_ID_BLUE; > + > + for (int i = 0; i < 3; i++) { > + int off = HP_COLOR_TABLE_PADDING + zone * 3 + i; > + > + mc_subled_info[i].channel = zone * 3 + i; > + mc_subled_info[i].intensity = color_table[off]; > + mc_subled_info[i].brightness = LED_FULL; > + } > + > + multicolor_led_dev->subled_info = mc_subled_info; > + multicolor_led_dev->num_colors = 3; You seem to have many literal 3 in this driver, and it would be easier to find relevant ones for each case if you replace them with define(s). This seems fine otherwise, AFAICT. > + ret = devm_led_classdev_multicolor_register(dev, multicolor_led_dev); > + if (ret) { > + dev_err(dev, "Failed to register multicolor RGB backlight\n"); > + return ret; > + } > + > + /* Initialize private data */ > + priv->zone = zone; > + priv->last_brightness = LED_FULL; > + } > + return 0; > +} > + > +static int __init hp_kbd_rgb_setup(void) > +{ > + u8 keyboard_type; > + int ret; > + > + ret = hp_wmi_perform_query(HPWMI_GET_KEYBOARD_TYPE_QUERY, HPWMI_GM, &keyboard_type, > + sizeof(keyboard_type), sizeof(keyboard_type)); > + if (ret) > + return ret; > + > + switch (keyboard_type) { > + case HP_KEYBOARD_TYPE_FOURZONE_WITH_NUMPAD: > + case HP_KEYBOARD_TYPE_FOURZONE_WITHOUT_NUMPAD: > + return hp_mc_leds_register(4); > + case HP_KEYBOARD_TYPE_SINGLEZONE_WITH_NUMPAD: > + case HP_KEYBOARD_TYPE_SINGLEZONE_WITHOUT_NUMPAD: > + return hp_mc_leds_register(1); > + default: > + return 0; > + } > +} > + > static int platform_profile_omen_get_ec(enum platform_profile_option *profile) > { > int tp; > @@ -2285,7 +2565,9 @@ static int __init hp_wmi_bios_setup(struct platform_device *device) > return err; > > thermal_profile_setup(device); > - > + err = hp_kbd_rgb_setup(); > + if (err) > + dev_err(&device->dev, "Failed to initialize keyboard RGB\n"); > return 0; > } > > -- i.