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Message-ID: <Y8SF2Os/NcWZkUMo@rishit-OMEN-Laptop-15-en0xxx>
Date: Mon, 16 Jan 2023 04:31:44 +0530
From: Rishit Bansal <rishitbansal0@...il.com>
To: Hans de Goede <hdegoede@...hat.com>,
Mark Gross <markgross@...nel.org>,
platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] platform/x86: hp-wmi: Support omen backlight control
wmi-acpi methods
The HP Omen Command Studio application includes a Light Studio feature
which can be used to control various features related to the keyboard
backlight via the 0x20009 command.
The command supports the following queries:
- 0x1: Checks if keyboard lighting is supported
- 0x2: Get the zone colors of each of the 4 zones on the keyboard
- 0x3: Set the zone colors of each of the 4 zones on the keyboard
- 0x4: Gets the state (on/off) of the backlight
- 0x5: Sets the state (on/off) of the backlight
This patch introduces a new sysfs led class called
"hp_omen::kbd_backlight" which can be used to control the state of the
backlight. It also includes a sysfs RW attribute called "backlight_color"
which can be used to get/set the current color of each zone.
The patch has been tested on an HP Omen 15-en0037AX (AMD) laptop.
Signed-off-by: Rishit Bansal <rishitbansal0@...il.com>
---
drivers/platform/x86/hp/hp-wmi.c | 110 +++++++++++++++++++++++++++++++
1 file changed, 110 insertions(+)
diff --git a/drivers/platform/x86/hp/hp-wmi.c b/drivers/platform/x86/hp/hp-wmi.c
index 0a99058be813..0dd6f1b6d9e1 100644
--- a/drivers/platform/x86/hp/hp-wmi.c
+++ b/drivers/platform/x86/hp/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@...f.ucam.org>");
MODULE_DESCRIPTION("HP laptop WMI hotkeys driver");
@@ -136,6 +137,7 @@ enum hp_wmi_command {
HPWMI_WRITE = 0x02,
HPWMI_ODM = 0x03,
HPWMI_GM = 0x20008,
+ HPWMI_KB = 0x20009,
};
enum hp_wmi_hardware_mask {
@@ -734,12 +736,56 @@ static ssize_t postcode_store(struct device *dev, struct device_attribute *attr,
return count;
}
+static ssize_t kbd_rgb_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;
+
+ strncat(buf, &val[25], 12);
+
+ return strlen(buf);
+}
+
+static ssize_t kbd_rgb_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 != 12)
+ return -1;
+
+ strncpy(&val[25], buf, count);
+
+ ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, HPWMI_KB, &val, sizeof(val),
+ 0);
+
+ if (ret)
+ return ret;
+
+ return count;
+}
+
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(kbd_rgb);
static struct attribute *hp_wmi_attrs[] = {
&dev_attr_display.attr,
@@ -748,6 +794,7 @@ static struct attribute *hp_wmi_attrs[] = {
&dev_attr_dock.attr,
&dev_attr_tablet.attr,
&dev_attr_postcode.attr,
+ &dev_attr_kbd_rgb.attr,
NULL,
};
ATTRIBUTE_GROUPS(hp_wmi);
@@ -1294,6 +1341,63 @@ static int thermal_profile_setup(void)
static int hp_wmi_hwmon_init(void);
+static struct led_classdev omen_kbd_led;
+
+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 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;
+
+ omen_kbd_led.name = "hp_omen::kbd_backlight";
+ omen_kbd_led.brightness_set = set_omen_backlight_brightness;
+ omen_kbd_led.brightness_get = get_omen_backlight_brightness;
+ omen_kbd_led.max_brightness = 1;
+
+ ret = devm_led_classdev_register(dev, &omen_kbd_led);
+
+ if (ret < 0)
+ return -1;
+
+ return 0;
+}
+
+static void omen_backlight_exit(struct device *dev)
+{
+ devm_led_classdev_unregister(dev, &omen_kbd_led);
+}
+
static int __init hp_wmi_bios_setup(struct platform_device *device)
{
int err;
@@ -1321,6 +1425,9 @@ 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;
}
@@ -1349,6 +1456,9 @@ static int __exit hp_wmi_bios_remove(struct platform_device *device)
if (platform_profile_support)
platform_profile_remove();
+ if (is_omen_lighting_supported())
+ omen_backlight_exit(&device->dev);
+
return 0;
}
--
2.37.2
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