[PATCH 1/7] platform/x86: uniwill-laptop: Add keyboard backlight support
From: Armin Wolf
Date: Sat May 30 2026 - 13:14:40 EST
Many Uniwill-based devices support either a white-only or fully
features RGB keyboard backlight. Add support for this feature
and handle the associated WMI events.
Signed-off-by: Armin Wolf <W_Armin@xxxxxx>
---
.../admin-guide/laptops/uniwill-laptop.rst | 13 +
drivers/platform/x86/uniwill/uniwill-acpi.c | 392 +++++++++++++++++-
2 files changed, 397 insertions(+), 8 deletions(-)
diff --git a/Documentation/admin-guide/laptops/uniwill-laptop.rst b/Documentation/admin-guide/laptops/uniwill-laptop.rst
index 24b41dbab886..2b1e5da703a5 100644
--- a/Documentation/admin-guide/laptops/uniwill-laptop.rst
+++ b/Documentation/admin-guide/laptops/uniwill-laptop.rst
@@ -77,6 +77,19 @@ LED class device. The default name of this LED class device is ``uniwill:multico
See Documentation/ABI/testing/sysfs-driver-uniwill-laptop for details on how to control the various
animation modes of the lightbar.
+Keyboard Backlight
+------------------
+
+The ``uniwill-laptop`` driver supports controlling the keyboard backlight using the standard
+LED class interface. The default name of this LED class device is ``uniwill:white:kbd_backlight``
+when the keyboard backlight supports only a single color, or ``uniwill:multicolor:kbd_backlight``
+when the keyboard backlight supports RGB colors. The maximum intensity for each color channel
+in RGB mode is 50.
+
+Keep in mind that due to hardware design choices, the driver does not support the RGB value
+``0x000000`` (black), instead it will fall back to ``0x010101`` (faint white). In order to
+disable the keyboard backlight, the standard LED brightness setting has to be used instead.
+
Configurable TGP
----------------
diff --git a/drivers/platform/x86/uniwill/uniwill-acpi.c b/drivers/platform/x86/uniwill/uniwill-acpi.c
index ab063ead45b9..fd040197b189 100644
--- a/drivers/platform/x86/uniwill/uniwill-acpi.c
+++ b/drivers/platform/x86/uniwill/uniwill-acpi.c
@@ -110,8 +110,31 @@
#define EC_ADDR_BAT_CYCLE_COUNT_2 0x04A7
#define EC_ADDR_PROJECT_ID 0x0740
+#define PROJECT_ID_NONE 0x00
+#define PROJECT_ID_GI 0x01
+#define PROJECT_ID_GJ 0x02
+#define PROJECT_ID_GK 0x03
+#define PROJECT_ID_GICN 0x04
+#define PROJECT_ID_GJCN 0x05
+#define PROJECT_ID_GK5CN_X 0x06
+#define PROJECT_ID_GK7CN_S 0x07
+#define PROJECT_ID_GK7CPCS_GK5CQ7Z 0x08
+#define PROJECT_ID_PF 0x09
+#define PROJECT_ID_GK5CP_4X_5X_6X 0x0A
+#define PROJECT_ID_IDP 0x0B
+#define PROJECT_ID_IDY_6Y 0x0C
+#define PROJECT_ID_IDY_7Y 0x0D
+#define PROJECT_ID_PF4MU_PF4MN_PF5MU 0x0E
+#define PROJECT_ID_CML_GAMING 0x0F
+#define PROJECT_ID_GK7NXXR 0x10
+#define PROJECT_ID_GM5MU1Y 0x11
#define PROJECT_ID_PH4TRX1 0x12
+#define PROJECT_ID_PH4TUX1 0x13
+#define PROJECT_ID_PH4TQX1 0x14
#define PROJECT_ID_PH6TRX1 0x15
+#define PROJECT_ID_PH6TQXX 0x16
+#define PROJECT_ID_PHXAXXX 0x17
+#define PROJECT_ID_PHXPXXX 0x18
#define EC_ADDR_AP_OEM 0x0741
#define ENABLE_MANUAL_CTRL BIT(0)
@@ -214,6 +237,7 @@
#define FAN_TABLE_OFFICE_MODE BIT(2)
#define FAN_V3 BIT(3)
#define DEFAULT_MODE BIT(4)
+#define ENABLE_CHINA_MODE BIT(6)
#define EC_ADDR_PL1_SETTING 0x0783
@@ -225,11 +249,11 @@
#define FAN_CURVE_LENGTH 5
#define EC_ADDR_KBD_STATUS 0x078C
-#define KBD_WHITE_ONLY BIT(0) // ~single color
-#define KBD_SINGLE_COLOR_OFF BIT(1)
+#define KBD_WHITE_ONLY BIT(0)
+#define KBD_POWER_OFF BIT(1)
#define KBD_TURBO_LEVEL_MASK GENMASK(3, 2)
#define KBD_APPLY BIT(4)
-#define KBD_BRIGHTNESS GENMASK(7, 5)
+#define KBD_BRIGHTNESS_MASK GENMASK(7, 5)
#define EC_ADDR_FAN_CTRL 0x078E
#define FAN3P5 BIT(1)
@@ -320,6 +344,9 @@
#define LED_CHANNELS 3
#define LED_MAX_BRIGHTNESS 200
+#define KBD_LED_CHANNELS 3
+#define KBD_LED_MAX_INTENSITY 50
+
#define UNIWILL_FEATURE_FN_LOCK BIT(0)
#define UNIWILL_FEATURE_SUPER_KEY BIT(1)
#define UNIWILL_FEATURE_TOUCHPAD_TOGGLE BIT(2)
@@ -333,6 +360,7 @@
#define UNIWILL_FEATURE_SECONDARY_FAN BIT(9)
#define UNIWILL_FEATURE_NVIDIA_CTGP_CONTROL BIT(10)
#define UNIWILL_FEATURE_USB_C_POWER_PRIORITY BIT(11)
+#define UNIWILL_FEATURE_KEYBOARD_BACKLIGHT BIT(12)
enum usb_c_power_priority_options {
USB_C_POWER_PRIORITY_CHARGING = 0,
@@ -344,6 +372,7 @@ struct uniwill_data {
acpi_handle handle;
struct regmap *regmap;
unsigned int features;
+ u8 project_id;
struct acpi_battery_hook hook;
struct mutex battery_lock; /* Protects the list of currently registered batteries */
union {
@@ -362,6 +391,18 @@ struct uniwill_data {
struct mutex led_lock; /* Protects writes to the lightbar registers */
struct led_classdev_mc led_mc_cdev;
struct mc_subled led_mc_subled_info[LED_CHANNELS];
+ bool single_color_kbd;
+ u8 kbd_led_max_brightness;
+ unsigned int last_kbd_status;
+ union {
+ struct {
+ /* Protects writes to the RGB keyboard backlight registers */
+ struct mutex kbd_rgb_led_lock;
+ struct led_classdev_mc kbd_led_mc_cdev;
+ struct mc_subled kbd_led_mc_subled_info[KBD_LED_CHANNELS];
+ };
+ struct led_classdev kbd_led_cdev;
+ };
struct mutex input_lock; /* Protects input sequence during notify */
struct input_dev *input_device;
struct notifier_block nb;
@@ -376,6 +417,7 @@ struct uniwill_battery_entry {
struct uniwill_device_descriptor {
unsigned int features;
+ u8 kbd_led_max_brightness;
/* Executed during driver probing */
int (*probe)(struct uniwill_data *data);
};
@@ -427,6 +469,9 @@ static const struct key_entry uniwill_keymap[] = {
{ KE_KEY, UNIWILL_OSD_KBDILLUMDOWN, { KEY_KBDILLUMDOWN }},
{ KE_KEY, UNIWILL_OSD_KBDILLUMUP, { KEY_KBDILLUMUP }},
+ /* Reported when the EC changed the keyboard backlight brightness */
+ { KE_IGNORE, UNIWILL_OSD_BACKLIGHT_LEVEL_CHANGE, { KEY_UNKNOWN }},
+
/* Reported when the user wants to toggle the microphone mute status */
{ KE_KEY, UNIWILL_OSD_MIC_MUTE, { KEY_MICMUTE }},
@@ -435,11 +480,6 @@ static const struct key_entry uniwill_keymap[] = {
/* Reported when the user wants to toggle the brightness of the keyboard */
{ KE_KEY, UNIWILL_OSD_KBDILLUMTOGGLE, { KEY_KBDILLUMTOGGLE }},
- { KE_KEY, UNIWILL_OSD_KB_LED_LEVEL0, { KEY_KBDILLUMTOGGLE }},
- { KE_KEY, UNIWILL_OSD_KB_LED_LEVEL1, { KEY_KBDILLUMTOGGLE }},
- { KE_KEY, UNIWILL_OSD_KB_LED_LEVEL2, { KEY_KBDILLUMTOGGLE }},
- { KE_KEY, UNIWILL_OSD_KB_LED_LEVEL3, { KEY_KBDILLUMTOGGLE }},
- { KE_KEY, UNIWILL_OSD_KB_LED_LEVEL4, { KEY_KBDILLUMTOGGLE }},
/* FIXME: find out the exact meaning of those events */
{ KE_IGNORE, UNIWILL_OSD_BAT_CHARGE_FULL_24_H, { KEY_UNKNOWN }},
@@ -547,6 +587,11 @@ static bool uniwill_writeable_reg(struct device *dev, unsigned int reg)
case EC_ADDR_LIGHTBAR_AC_BLUE:
case EC_ADDR_BIOS_OEM:
case EC_ADDR_TRIGGER:
+ case EC_ADDR_RGB_RED:
+ case EC_ADDR_RGB_GREEN:
+ case EC_ADDR_RGB_BLUE:
+ case EC_ADDR_BIOS_OEM_2:
+ case EC_ADDR_KBD_STATUS:
case EC_ADDR_OEM_4:
case EC_ADDR_CHARGE_CTRL:
case EC_ADDR_LIGHTBAR_BAT_CTRL:
@@ -583,8 +628,14 @@ static bool uniwill_readable_reg(struct device *dev, unsigned int reg)
case EC_ADDR_BIOS_OEM:
case EC_ADDR_PWM_1:
case EC_ADDR_PWM_2:
+ case EC_ADDR_SUPPORT_2:
case EC_ADDR_TRIGGER:
case EC_ADDR_SWITCH_STATUS:
+ case EC_ADDR_RGB_RED:
+ case EC_ADDR_RGB_GREEN:
+ case EC_ADDR_RGB_BLUE:
+ case EC_ADDR_BIOS_OEM_2:
+ case EC_ADDR_KBD_STATUS:
case EC_ADDR_OEM_4:
case EC_ADDR_CHARGE_CTRL:
case EC_ADDR_LIGHTBAR_BAT_CTRL:
@@ -616,8 +667,10 @@ static bool uniwill_volatile_reg(struct device *dev, unsigned int reg)
case EC_ADDR_BIOS_OEM:
case EC_ADDR_PWM_1:
case EC_ADDR_PWM_2:
+ case EC_ADDR_SUPPORT_2:
case EC_ADDR_TRIGGER:
case EC_ADDR_SWITCH_STATUS:
+ case EC_ADDR_KBD_STATUS:
case EC_ADDR_OEM_4:
case EC_ADDR_CHARGE_CTRL:
case EC_ADDR_USB_C_POWER_PRIORITY:
@@ -1441,6 +1494,246 @@ static int uniwill_led_init(struct uniwill_data *data)
&init_data);
}
+static int uniwill_notify_kbd_led(struct uniwill_data *data, int brightness)
+{
+ struct led_classdev *led_cdev;
+ int ret;
+
+ if (data->single_color_kbd)
+ led_cdev = &data->kbd_led_cdev;
+ else
+ led_cdev = &data->kbd_led_mc_cdev.led_cdev;
+
+ guard(mutex)(&led_cdev->led_access);
+
+ /* Sync the LED brightness with the actual hardware state */
+ ret = led_update_brightness(led_cdev);
+ if (ret < 0)
+ return ret;
+
+ led_classdev_notify_brightness_hw_changed(led_cdev, brightness);
+
+ return 0;
+}
+
+#define KBD_LED_MASK (KBD_BRIGHTNESS_MASK | KBD_APPLY | KBD_POWER_OFF)
+
+static int uniwill_kbd_led_write_brightness(struct uniwill_data *data, int brightness)
+{
+ /* KBD_POWER_OFF is always implicitly cleared */
+ unsigned int regval = FIELD_PREP(KBD_BRIGHTNESS_MASK, brightness) | KBD_APPLY;
+
+ /* We must ensure that the "apply" bit is always written */
+ return regmap_write_bits(data->regmap, EC_ADDR_KBD_STATUS, KBD_LED_MASK, regval);
+}
+
+static int uniwill_kbd_led_read_brightness(struct uniwill_data *data)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(data->regmap, EC_ADDR_KBD_STATUS, ®val);
+ if (ret < 0)
+ return ret;
+
+ return min(FIELD_GET(KBD_BRIGHTNESS_MASK, regval), data->kbd_led_max_brightness);
+}
+
+static int uniwill_kbd_led_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct uniwill_data *data = container_of(led_cdev, struct uniwill_data, kbd_led_cdev);
+
+ return uniwill_kbd_led_write_brightness(data, brightness);
+}
+
+static enum led_brightness uniwill_kbd_led_brightness_get(struct led_classdev *led_cdev)
+{
+ struct uniwill_data *data = container_of(led_cdev, struct uniwill_data, kbd_led_cdev);
+
+ return uniwill_kbd_led_read_brightness(data);
+}
+
+static const unsigned int uniwill_kbd_led_channel_to_reg[KBD_LED_CHANNELS] = {
+ EC_ADDR_RGB_RED,
+ EC_ADDR_RGB_GREEN,
+ EC_ADDR_RGB_BLUE,
+};
+
+static int uniwill_kbd_led_mc_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct led_classdev_mc *led_mc_cdev = lcdev_to_mccdev(led_cdev);
+ struct uniwill_data *data = container_of(led_mc_cdev, struct uniwill_data, kbd_led_mc_cdev);
+ unsigned int min_intensity = 0;
+ unsigned int regval;
+ int ret;
+
+ guard(mutex)(&data->kbd_rgb_led_lock);
+
+ /*
+ * The EC interprets a RGB value of 0x000000 as a command to restore
+ * the device-specfic default RGB value. Work around this by writing
+ * a RGB value of 0x010101 (faint white) instead.
+ */
+ if (data->kbd_led_mc_subled_info[0].intensity == 0 &&
+ data->kbd_led_mc_subled_info[1].intensity == 0 &&
+ data->kbd_led_mc_subled_info[2].intensity == 0)
+ min_intensity = 1;
+
+ for (int i = 0; i < KBD_LED_CHANNELS; i++) {
+ regval = max(data->kbd_led_mc_subled_info[i].intensity, min_intensity);
+ ret = regmap_write(data->regmap, uniwill_kbd_led_channel_to_reg[i], regval);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = regmap_write_bits(data->regmap, EC_ADDR_TRIGGER, RGB_APPLY_COLOR, RGB_APPLY_COLOR);
+ if (ret < 0)
+ return ret;
+
+ return uniwill_kbd_led_write_brightness(data, brightness);
+}
+
+static enum led_brightness uniwill_kbd_led_mc_brightness_get(struct led_classdev *led_cdev)
+{
+ struct led_classdev_mc *led_mc_cdev = lcdev_to_mccdev(led_cdev);
+ struct uniwill_data *data = container_of(led_mc_cdev, struct uniwill_data, kbd_led_mc_cdev);
+
+ return uniwill_kbd_led_read_brightness(data);
+}
+
+static int uniwill_kbd_led_init(struct uniwill_data *data)
+{
+ unsigned int color_indices[KBD_LED_CHANNELS] = {
+ LED_COLOR_ID_RED,
+ LED_COLOR_ID_GREEN,
+ LED_COLOR_ID_BLUE,
+ };
+ struct led_init_data init_data = {
+ .devicename = DRIVER_NAME,
+ .devname_mandatory = true,
+ };
+ bool intensity_all_zeros = true;
+ bool needs_trigger = false;
+ unsigned int regval;
+ int ret;
+
+ if (!uniwill_device_supports(data, UNIWILL_FEATURE_KEYBOARD_BACKLIGHT))
+ return 0;
+
+ ret = regmap_read(data->regmap, EC_ADDR_SUPPORT_2, ®val);
+ if (ret < 0)
+ return ret;
+
+ if (!(regval & CHINA_MODE)) {
+ ret = regmap_set_bits(data->regmap, EC_ADDR_BIOS_OEM_2, ENABLE_CHINA_MODE);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = regmap_read(data->regmap, EC_ADDR_KBD_STATUS, ®val);
+ if (ret < 0)
+ return ret;
+
+ regval |= KBD_APPLY;
+ regval &= ~KBD_POWER_OFF;
+ ret = regmap_write(data->regmap, EC_ADDR_KBD_STATUS, regval);
+ if (ret < 0)
+ return ret;
+
+ switch (data->project_id) {
+ case PROJECT_ID_PF:
+ case PROJECT_ID_PF4MU_PF4MN_PF5MU:
+ case PROJECT_ID_PH4TRX1:
+ case PROJECT_ID_PH4TUX1:
+ case PROJECT_ID_PH4TQX1:
+ case PROJECT_ID_PH6TRX1:
+ case PROJECT_ID_PH6TQXX:
+ case PROJECT_ID_PHXAXXX:
+ case PROJECT_ID_PHXPXXX:
+ data->single_color_kbd = true;
+ break;
+ default:
+ data->single_color_kbd = regval & KBD_WHITE_ONLY;
+ break;
+ }
+
+ if (data->single_color_kbd) {
+ init_data.default_label = "white:" LED_FUNCTION_KBD_BACKLIGHT;
+ data->kbd_led_cdev.max_brightness = data->kbd_led_max_brightness;
+ data->kbd_led_cdev.color = LED_COLOR_ID_WHITE;
+ data->kbd_led_cdev.flags = LED_BRIGHT_HW_CHANGED | LED_REJECT_NAME_CONFLICT;
+ data->kbd_led_cdev.brightness_set_blocking = uniwill_kbd_led_brightness_set;
+ data->kbd_led_cdev.brightness_get = uniwill_kbd_led_brightness_get;
+
+ return devm_led_classdev_register_ext(data->dev, &data->kbd_led_cdev, &init_data);
+ }
+
+ for (int i = 0; i < KBD_LED_CHANNELS; i++) {
+ data->kbd_led_mc_subled_info[i].color_index = color_indices[i];
+
+ ret = regmap_read(data->regmap, uniwill_kbd_led_channel_to_reg[i], ®val);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Make sure that the initial intensity value is not greater than
+ * the maximum intensity.
+ */
+ if (regval > KBD_LED_MAX_INTENSITY) {
+ regval = KBD_LED_MAX_INTENSITY;
+ ret = regmap_write(data->regmap, uniwill_kbd_led_channel_to_reg[i], regval);
+ if (ret < 0)
+ return ret;
+
+ needs_trigger = true;
+ }
+
+ if (regval)
+ intensity_all_zeros = false;
+
+ data->kbd_led_mc_subled_info[i].intensity = regval;
+ data->kbd_led_mc_subled_info[i].max_intensity = KBD_LED_MAX_INTENSITY;
+ data->kbd_led_mc_subled_info[i].channel = i;
+ }
+
+ /* See uniwill_kbd_led_mc_brightness_set() for an explaination. */
+ if (intensity_all_zeros) {
+ for (int i = 0; i < KBD_LED_CHANNELS; i++) {
+ data->kbd_led_mc_subled_info[i].intensity = 1;
+ ret = regmap_write(data->regmap, uniwill_kbd_led_channel_to_reg[i], 1);
+ if (ret < 0)
+ return ret;
+ }
+
+ needs_trigger = true;
+ }
+
+ if (needs_trigger) {
+ ret = regmap_write_bits(data->regmap, EC_ADDR_TRIGGER, RGB_APPLY_COLOR,
+ RGB_APPLY_COLOR);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = devm_mutex_init(data->dev, &data->kbd_rgb_led_lock);
+ if (ret < 0)
+ return ret;
+
+ init_data.default_label = "multicolor:" LED_FUNCTION_KBD_BACKLIGHT;
+ data->kbd_led_mc_cdev.led_cdev.max_brightness = data->kbd_led_max_brightness;
+ data->kbd_led_mc_cdev.led_cdev.color = LED_COLOR_ID_MULTI;
+ data->kbd_led_mc_cdev.led_cdev.flags = LED_BRIGHT_HW_CHANGED | LED_REJECT_NAME_CONFLICT;
+ data->kbd_led_mc_cdev.led_cdev.brightness_set_blocking = uniwill_kbd_led_mc_brightness_set;
+ data->kbd_led_mc_cdev.led_cdev.brightness_get = uniwill_kbd_led_mc_brightness_get;
+ data->kbd_led_mc_cdev.subled_info = data->kbd_led_mc_subled_info;
+ data->kbd_led_mc_cdev.num_colors = KBD_LED_CHANNELS;
+
+ return devm_led_classdev_multicolor_register_ext(data->dev, &data->kbd_led_mc_cdev,
+ &init_data);
+}
+
static unsigned int uniwill_sanitize_battery_threshold(unsigned int value)
{
/* 0 means "charging threshold not active" */
@@ -1789,6 +2082,31 @@ static int uniwill_notifier_call(struct notifier_block *nb, unsigned long action
sysfs_notify(&data->dev->kobj, NULL, "fn_lock");
return NOTIFY_OK;
+ case UNIWILL_OSD_KB_LED_LEVEL0:
+ if (!uniwill_device_supports(data, UNIWILL_FEATURE_KEYBOARD_BACKLIGHT))
+ return NOTIFY_DONE;
+
+ return notifier_from_errno(uniwill_notify_kbd_led(data, 0));
+ case UNIWILL_OSD_KB_LED_LEVEL1:
+ if (!uniwill_device_supports(data, UNIWILL_FEATURE_KEYBOARD_BACKLIGHT))
+ return NOTIFY_DONE;
+
+ return notifier_from_errno(uniwill_notify_kbd_led(data, 1));
+ case UNIWILL_OSD_KB_LED_LEVEL2:
+ if (!uniwill_device_supports(data, UNIWILL_FEATURE_KEYBOARD_BACKLIGHT))
+ return NOTIFY_DONE;
+
+ return notifier_from_errno(uniwill_notify_kbd_led(data, 2));
+ case UNIWILL_OSD_KB_LED_LEVEL3:
+ if (!uniwill_device_supports(data, UNIWILL_FEATURE_KEYBOARD_BACKLIGHT))
+ return NOTIFY_DONE;
+
+ return notifier_from_errno(uniwill_notify_kbd_led(data, 3));
+ case UNIWILL_OSD_KB_LED_LEVEL4:
+ if (!uniwill_device_supports(data, UNIWILL_FEATURE_KEYBOARD_BACKLIGHT))
+ return NOTIFY_DONE;
+
+ return notifier_from_errno(uniwill_notify_kbd_led(data, 4));
default:
mutex_lock(&data->input_lock);
sparse_keymap_report_event(data->input_device, action, 1, true);
@@ -1842,6 +2160,7 @@ static int uniwill_ec_init(struct uniwill_data *data)
if (ret < 0)
return ret;
+ data->project_id = value;
dev_dbg(data->dev, "Project ID: %u\n", value);
ret = regmap_set_bits(data->regmap, EC_ADDR_AP_OEM, ENABLE_MANUAL_CTRL);
@@ -1885,6 +2204,7 @@ static int uniwill_probe(struct platform_device *pdev)
return ret;
data->features = device_descriptor.features;
+ data->kbd_led_max_brightness = device_descriptor.kbd_led_max_brightness;
/*
* Some devices might need to perform some device-specific initialization steps
@@ -1905,6 +2225,10 @@ static int uniwill_probe(struct platform_device *pdev)
if (ret < 0)
return ret;
+ ret = uniwill_kbd_led_init(data);
+ if (ret < 0)
+ return ret;
+
ret = uniwill_hwmon_init(data);
if (ret < 0)
return ret;
@@ -1976,6 +2300,31 @@ static int uniwill_suspend_battery(struct uniwill_data *data)
return regmap_read(data->regmap, EC_ADDR_CHARGE_CTRL, &data->last_charge_ctrl);
}
+static int uniwill_suspend_kbd_led(struct uniwill_data *data)
+{
+ unsigned int regval;
+ int ret;
+
+ if (!uniwill_device_supports(data, UNIWILL_FEATURE_KEYBOARD_BACKLIGHT))
+ return 0;
+
+ ret = regmap_read(data->regmap, EC_ADDR_KBD_STATUS, ®val);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Save the current keyboard backlight settings in order to restore them
+ * during resume. We cannot use the regmap code for that since this register
+ * needs to be declared as volatile because the brightness can be changed
+ * by the EC.
+ */
+ data->last_kbd_status = regval;
+ FIELD_MODIFY(KBD_BRIGHTNESS_MASK, ®val, 0);
+ regval |= KBD_APPLY | KBD_POWER_OFF;
+
+ return regmap_write(data->regmap, EC_ADDR_KBD_STATUS, regval);
+}
+
static int uniwill_suspend_nvidia_ctgp(struct uniwill_data *data)
{
if (!uniwill_device_supports(data, UNIWILL_FEATURE_NVIDIA_CTGP_CONTROL))
@@ -2006,6 +2355,10 @@ static int uniwill_suspend(struct device *dev)
if (ret < 0)
return ret;
+ ret = uniwill_suspend_kbd_led(data);
+ if (ret < 0)
+ return ret;
+
ret = uniwill_suspend_nvidia_ctgp(data);
if (ret < 0)
return ret;
@@ -2052,6 +2405,23 @@ static int uniwill_resume_battery(struct uniwill_data *data)
return 0;
}
+static int uniwill_resume_kbd_led(struct uniwill_data *data)
+{
+ int ret;
+
+ if (!uniwill_device_supports(data, UNIWILL_FEATURE_KEYBOARD_BACKLIGHT))
+ return 0;
+
+ ret = regmap_write(data->regmap, EC_ADDR_KBD_STATUS, data->last_kbd_status | KBD_APPLY);
+ if (ret < 0)
+ return ret;
+
+ if (data->single_color_kbd)
+ return 0;
+
+ return regmap_write_bits(data->regmap, EC_ADDR_TRIGGER, RGB_APPLY_COLOR, RGB_APPLY_COLOR);
+}
+
static int uniwill_resume_nvidia_ctgp(struct uniwill_data *data)
{
if (!uniwill_device_supports(data, UNIWILL_FEATURE_NVIDIA_CTGP_CONTROL))
@@ -2096,6 +2466,10 @@ static int uniwill_resume(struct device *dev)
if (ret < 0)
return ret;
+ ret = uniwill_resume_kbd_led(data);
+ if (ret < 0)
+ return ret;
+
ret = uniwill_resume_nvidia_ctgp(data);
if (ret < 0)
return ret;
@@ -2745,6 +3119,8 @@ static int __init uniwill_init(void)
if (force) {
/* Assume that the device supports all features except the charge limit */
device_descriptor.features = UINT_MAX & ~UNIWILL_FEATURE_BATTERY_CHARGE_LIMIT;
+ /* Some models only support 3 brightness levels */
+ device_descriptor.kbd_led_max_brightness = 4;
pr_warn("Enabling potentially unsupported features\n");
}
--
2.39.5