[PATCH 1/5] platform/x86: uniwill-laptop: Report correct lightbar brightness

[Armin Wolf <W_Armin@gmx.de>]

The LED sysfs ABI now allows us to specify the maximum values for the
global brightness and the color intensity values independently. At the
same time the maximum brightness value reported for the lightbar (like
200) does not match the real value supported by the hardware (1),
potentially confusing users.

Report the correct maximum brightness value and only use the intensity
values for controlling the lightbar color.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
---
 drivers/platform/x86/uniwill/uniwill-acpi.c | 35 ++++++++++-----------
 1 file changed, 16 insertions(+), 19 deletions(-)

diff --git a/drivers/platform/x86/uniwill/uniwill-acpi.c b/drivers/platform/x86/uniwill/uniwill-acpi.c
index 7a2eeaec4c96..7420e1dd4716 100644
--- a/drivers/platform/x86/uniwill/uniwill-acpi.c
+++ b/drivers/platform/x86/uniwill/uniwill-acpi.c
@@ -398,7 +398,7 @@ struct uniwill_data {
 	struct mutex super_key_lock;	/* Protects the toggling of the super key lock state */
 	struct list_head batteries;
 	struct mutex led_lock;		/* Protects writes to the lightbar registers */
-	u8 lightbar_max_brightness;
+	u8 lightbar_max_intensity;
 	struct led_classdev_mc led_mc_cdev;
 	struct mc_subled led_mc_subled_info[LED_CHANNELS];
 	bool kbd_led_single_color;
@@ -429,7 +429,7 @@ struct uniwill_device_descriptor {
 	unsigned int features;
 	bool kbd_led_single_color;
 	u8 kbd_led_max_brightness;
-	u8 lightbar_max_brightness;
+	u8 lightbar_max_intensity;
 	/* Executed during driver probing */
 	int (*probe)(struct uniwill_data *data);
 };
@@ -1509,20 +1509,16 @@ static int uniwill_led_brightness_set(struct led_classdev *led_cdev, enum led_br
 	unsigned int value;
 	int ret;
 
-	ret = led_mc_calc_color_components(led_mc_cdev, brightness);
-	if (ret < 0)
-		return ret;
-
 	guard(mutex)(&data->led_lock);
 
 	for (int i = 0; i < LED_CHANNELS; i++) {
-		/* Prevent the brightness values from overflowing */
-		value = min(data->lightbar_max_brightness, data->led_mc_subled_info[i].brightness);
-		ret = regmap_write(data->regmap, uniwill_led_channel_to_ac_reg[i], value);
+		ret = regmap_write(data->regmap, uniwill_led_channel_to_ac_reg[i],
+				   data->led_mc_subled_info[i].intensity);
 		if (ret < 0)
 			return ret;
 
-		ret = regmap_write(data->regmap, uniwill_led_channel_to_bat_reg[i], value);
+		ret = regmap_write(data->regmap, uniwill_led_channel_to_bat_reg[i],
+				   data->led_mc_subled_info[i].intensity);
 		if (ret < 0)
 			return ret;
 	}
@@ -1586,14 +1582,14 @@ static int uniwill_led_init(struct uniwill_data *data)
 		return ret;
 
 	data->led_mc_cdev.led_cdev.color = LED_COLOR_ID_MULTI;
-	data->led_mc_cdev.led_cdev.max_brightness = data->lightbar_max_brightness;
+	data->led_mc_cdev.led_cdev.max_brightness = 1;
 	data->led_mc_cdev.led_cdev.flags = LED_REJECT_NAME_CONFLICT;
 	data->led_mc_cdev.led_cdev.brightness_set_blocking = uniwill_led_brightness_set;
 
 	if (value & LIGHTBAR_S0_OFF)
 		data->led_mc_cdev.led_cdev.brightness = 0;
 	else
-		data->led_mc_cdev.led_cdev.brightness = data->lightbar_max_brightness;
+		data->led_mc_cdev.led_cdev.brightness = 1;
 
 	for (int i = 0; i < LED_CHANNELS; i++) {
 		data->led_mc_subled_info[i].color_index = color_indices[i];
@@ -1604,9 +1600,9 @@ static int uniwill_led_init(struct uniwill_data *data)
 
 		/*
 		 * Make sure that the initial intensity value is not greater than
-		 * the maximum brightness.
+		 * the maximum intensity.
 		 */
-		value = min(data->lightbar_max_brightness, value);
+		value = min(data->lightbar_max_intensity, value);
 		ret = regmap_write(data->regmap, uniwill_led_channel_to_ac_reg[i], value);
 		if (ret < 0)
 			return ret;
@@ -1616,6 +1612,7 @@ static int uniwill_led_init(struct uniwill_data *data)
 			return ret;
 
 		data->led_mc_subled_info[i].intensity = value;
+		data->led_mc_subled_info[i].max_intensity = data->lightbar_max_intensity;
 		data->led_mc_subled_info[i].channel = i;
 	}
 
@@ -2338,7 +2335,7 @@ static int uniwill_probe(struct platform_device *pdev)
 	data->features = device_descriptor.features;
 	data->kbd_led_single_color = device_descriptor.kbd_led_single_color;
 	data->kbd_led_max_brightness = device_descriptor.kbd_led_max_brightness;
-	data->lightbar_max_brightness = device_descriptor.lightbar_max_brightness;
+	data->lightbar_max_intensity = device_descriptor.lightbar_max_intensity;
 
 	/*
 	 * Some devices might need to perform some device-specific initialization steps
@@ -2685,7 +2682,7 @@ static struct uniwill_device_descriptor lapqc71a_lapqc71b_descriptor __initdata
 		    UNIWILL_FEATURE_GPU_TEMP |
 		    UNIWILL_FEATURE_PRIMARY_FAN |
 		    UNIWILL_FEATURE_SECONDARY_FAN,
-	.lightbar_max_brightness = 36,
+	.lightbar_max_intensity = 36,
 };
 
 static struct uniwill_device_descriptor lapac71h_descriptor __initdata = {
@@ -2709,7 +2706,7 @@ static struct uniwill_device_descriptor lapkc71f_descriptor __initdata = {
 		    UNIWILL_FEATURE_GPU_TEMP |
 		    UNIWILL_FEATURE_PRIMARY_FAN |
 		    UNIWILL_FEATURE_SECONDARY_FAN,
-	.lightbar_max_brightness = 200,
+	.lightbar_max_intensity = 200,
 };
 
 /*
@@ -3355,8 +3352,8 @@ static int __init uniwill_init(void)
 		device_descriptor.kbd_led_single_color = false;
 		/* Some models only support 3 brightness levels */
 		device_descriptor.kbd_led_max_brightness = 4;
-		/* Some models only support 36 brightness levels per color component */
-		device_descriptor.lightbar_max_brightness = 200;
+		/* Some models only support 36 intensity levels per color component */
+		device_descriptor.lightbar_max_intensity = 200;
 		pr_warn("Enabling potentially unsupported features\n");
 	}
 
-- 
2.39.5