[hp-wmi] Keyboard lighting

hp-wmi/hp-wmi.c

@@ -27,6 +27,7 @@
 #include <linux/rfkill.h>
 #include <linux/string.h>
 #include <linux/dmi.h>
+#include <linux/leds.h>
 
 MODULE_AUTHOR("Matthew Garrett <mjg59@srcf.ucam.org>");
 MODULE_DESCRIPTION("HP laptop WMI hotkeys driver");
@@ -143,6 +144,7 @@ enum hp_wmi_command {
 	HPWMI_WRITE	= 0x02,
 	HPWMI_ODM	= 0x03,
 	HPWMI_GM	= 0x20008,
+	HPWMI_KB	= 0x20009,
 };
 
 enum hp_wmi_hardware_mask {
@@ -274,6 +276,9 @@ static const char * const tablet_chassis_types[] = {
 
 #define DEVICE_MODE_TABLET	0x06
 
+#define OMEN_ZONE_COLOR_OFFSET 0x19
+#define OMEN_ZONE_COLOR_LEN 0x0c
+
 /* map output size to the corresponding WMI method id */
 static inline int encode_outsize_for_pvsz(int outsize)
 {
@@ -781,12 +786,56 @@ static int camera_shutter_input_setup(void)
 	return err;
 }
 
+static ssize_t zone_colors_show(struct device *dev,
+				    struct device_attribute *attr, char *buf)
+{
+	u8 val[128];
+
+	int ret = hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, HPWMI_KB, &val,
+				       zero_if_sup(val), sizeof(val));
+
+	if (ret)
+		return ret;
+
+	memcpy(buf, &val[OMEN_ZONE_COLOR_OFFSET], OMEN_ZONE_COLOR_LEN);
+
+	return OMEN_ZONE_COLOR_LEN;
+}
+
+static ssize_t zone_colors_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	u8 val[128];
+	int ret;
+
+	ret = hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, HPWMI_KB, &val,
+				   zero_if_sup(val), sizeof(val));
+
+	if (ret)
+		return ret;
+
+	if (count != OMEN_ZONE_COLOR_LEN)
+		return -1;
+
+	memcpy(&val[OMEN_ZONE_COLOR_OFFSET], buf, count);
+
+	ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, HPWMI_KB, &val, sizeof(val),
+				   0);
+
+	if (ret)
+		return ret;
+
+	return OMEN_ZONE_COLOR_LEN;
+}
+
 static DEVICE_ATTR_RO(display);
 static DEVICE_ATTR_RO(hddtemp);
 static DEVICE_ATTR_RW(als);
 static DEVICE_ATTR_RO(dock);
 static DEVICE_ATTR_RO(tablet);
 static DEVICE_ATTR_RW(postcode);
+static DEVICE_ATTR_RW(zone_colors);
 
 static struct attribute *hp_wmi_attrs[] = {
 	&dev_attr_display.attr,
@@ -799,6 +848,12 @@ static struct attribute *hp_wmi_attrs[] = {
 };
 ATTRIBUTE_GROUPS(hp_wmi);
 
+static struct attribute *omen_kbd_led_attrs[] = {
+	&dev_attr_zone_colors.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(omen_kbd_led);
+
 static void hp_wmi_notify(u32 value, void *context)
 {
 	struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
@@ -910,6 +965,10 @@ static void hp_wmi_notify(u32 value, void *context)
 	case HPWMI_PROXIMITY_SENSOR:
 		break;
 	case HPWMI_BACKLIT_KB_BRIGHTNESS:
+		input_report_key(hp_wmi_input_dev, KEY_KBDILLUMTOGGLE, true);
+		input_sync(hp_wmi_input_dev);
+		input_report_key(hp_wmi_input_dev, KEY_KBDILLUMTOGGLE, false);
+		input_sync(hp_wmi_input_dev);
 		break;
 	case HPWMI_PEAKSHIFT_PERIOD:
 		break;
@@ -1448,6 +1507,60 @@ static int thermal_profile_setup(void)
 
 static int hp_wmi_hwmon_init(void);
 
+static enum led_brightness get_omen_backlight_brightness(struct led_classdev *cdev)
+{
+	u8 val;
+
+	int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, HPWMI_KB, &val, zero_if_sup(val), sizeof(val));
+
+	if (ret)
+		return ret;
+
+	return (val & 0x80) ? LED_ON : LED_OFF;
+}
+
+static void set_omen_backlight_brightness(struct led_classdev *cdev, enum led_brightness value)
+{
+	char buffer[4] = { (value == LED_OFF) ? 0x64 : 0xe4, 0, 0, 0 };
+
+	hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, HPWMI_KB, &buffer,
+				       sizeof(buffer), 0);
+}
+
+static struct led_classdev omen_kbd_led = {
+	.name = "hp_omen::kbd_backlight",
+	.brightness_set = set_omen_backlight_brightness,
+	.brightness_get = get_omen_backlight_brightness,
+	.max_brightness = 1,
+	.groups = omen_kbd_led_groups,
+};
+
+static bool is_omen_lighting_supported(void)
+{
+	u8 val;
+
+	int ret = hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, HPWMI_KB, &val, zero_if_sup(val), sizeof(val));
+
+	if (ret)
+		return false;
+
+	return (val & 1) == 1;
+}
+
+static int omen_backlight_init(struct device *dev)
+{
+	int ret;
+
+	input_set_capability(hp_wmi_input_dev, KE_KEY, KEY_KBDILLUMTOGGLE);
+
+	ret = devm_led_classdev_register(dev, &omen_kbd_led);
+
+	if (ret < 0)
+		return -1;
+
+	return 0;
+}
+
 static int __init hp_wmi_bios_setup(struct platform_device *device)
 {
 	int err;
@@ -1475,6 +1588,9 @@ static int __init hp_wmi_bios_setup(struct platform_device *device)
 
 	thermal_profile_setup();
 
+	if (is_omen_lighting_supported())
+		omen_backlight_init(&device->dev);
+
 	return 0;
 }