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Subject[PATCH] platform/x86: asus-wmi: add support for ASUS screenpad
Date
Add support for the WMI methods used to turn off and adjust the
brightness of the secondary "screenpad" device found on some high-end
ASUS laptops like the GX650P series and others.

Signed-off-by: Luke D. Jones <luke@ljones.dev>
---
.../ABI/testing/sysfs-platform-asus-wmi | 20 +++
drivers/platform/x86/asus-wmi.c | 121 ++++++++++++++++++
include/linux/platform_data/x86/asus-wmi.h | 4 +
3 files changed, 145 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-platform-asus-wmi b/Documentation/ABI/testing/sysfs-platform-asus-wmi
index a77a004a1baa..97028c919c03 100644
--- a/Documentation/ABI/testing/sysfs-platform-asus-wmi
+++ b/Documentation/ABI/testing/sysfs-platform-asus-wmi
@@ -98,3 +98,23 @@ Description:
Enable an LCD response-time boost to reduce or remove ghosting:
* 0 - Disable,
* 1 - Enable
+
+What: /sys/devices/platform/<platform>/screenpad_enable
+Date: May 2023
+KernelVersion: 6.4
+Contact: "Luke Jones" <luke@ljones.dev>
+Description:
+ Enable the secondary "screenpad" screen found on some ASUS
+ devices which is typically a short screen mounted above the
+ keyboard and below the main screen:
+ * 0 - Disable,
+ * 1 - Enable
+
+What: /sys/devices/platform/<platform>/screenpad_brightness
+Date: May 2023
+KernelVersion: 6.4
+Contact: "Luke Jones" <luke@ljones.dev>
+Description:
+ Control the brightness of the secondary "screenpad" screen
+ found on some ASUS devices:
+ * 0-255 where 255 is maximum brightness
\ No newline at end of file
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 1038dfdcdd32..bd3975be9060 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -241,6 +241,10 @@ struct asus_wmi {
bool dgpu_disable_available;
bool gpu_mux_mode_available;

+ bool screenpad_enable_available;
+ bool screenpad_brightness_available;
+ u8 screenpad_last_brightness;
+
bool kbd_rgb_mode_available;
bool kbd_rgb_state_available;

@@ -733,6 +737,113 @@ static ssize_t gpu_mux_mode_store(struct device *dev,
}
static DEVICE_ATTR_RW(gpu_mux_mode);

+/* screenpad switch *************************************************************/
+static ssize_t screenpad_enable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct asus_wmi *asus = dev_get_drvdata(dev);
+ int result;
+
+ result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_SCREENPAD_DISABLE);
+ if (result < 0)
+ return result;
+
+ return sysfs_emit(buf, "%d\n", result);
+}
+
+static ssize_t screenpad_enable_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct asus_wmi *asus = dev_get_drvdata(dev);
+ int result, err;
+ u8 enable;
+
+ err = kstrtou8(buf, 10, &enable);
+ if (err)
+ return err;
+
+ if (enable > 1)
+ return -EINVAL;
+
+ if (enable == 0) {
+ /* Get and store brightness before disabling */
+ asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_SCREENPAD_LIGHT, &result);
+ if (result < 0)
+ return result;
+ asus->screenpad_last_brightness = result & ASUS_WMI_DSTS_BRIGHTNESS_MASK;
+
+ err = asus_wmi_set_devstate(ASUS_WMI_DEVID_SCREENPAD_DISABLE, enable, &result);
+ } else {
+ /* Setting the brightness is what re-enables the screenpad */
+ err = asus_wmi_set_devstate(ASUS_WMI_DEVID_SCREENPAD_LIGHT,
+ asus->screenpad_last_brightness,
+ &result);
+ }
+ if (err) {
+ dev_err(dev, "Failed to set screenpad_enable: %d\n", err);
+ return err;
+ }
+ if (result != 1) {
+ dev_warn(dev, "Failed to set screenpad_enable (result): 0x%x\n", result);
+ return -EIO;
+ }
+
+ sysfs_notify(&asus->platform_device->dev.kobj, NULL, "screenpad_enable");
+
+ return count;
+}
+static DEVICE_ATTR_RW(screenpad_enable);
+
+/* screenpad brightness *************************************************************/
+static ssize_t screenpad_brightness_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct asus_wmi *asus = dev_get_drvdata(dev);
+ int result;
+
+ /* Check if the screen is enabled, if not, return last saved brightness */
+ result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_SCREENPAD_DISABLE);
+ if (result < 0)
+ return result;
+ if (!result)
+ return asus->screenpad_last_brightness;
+
+ asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_SCREENPAD_LIGHT, &result);
+ if (result < 0)
+ return result;
+
+ return sysfs_emit(buf, "%d\n", result & ASUS_WMI_DSTS_BRIGHTNESS_MASK);
+}
+
+static ssize_t screenpad_brightness_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct asus_wmi *asus = dev_get_drvdata(dev);
+ int result, err;
+ u8 brightness;
+
+ err = kstrtou8(buf, 10, &brightness);
+ if (err)
+ return err;
+
+ err = asus_wmi_set_devstate(ASUS_WMI_DEVID_SCREENPAD_LIGHT, brightness, &result);
+ if (err) {
+ dev_err(dev, "Failed to set screenpad_brightness: %d\n", err);
+ return err;
+ }
+ if (result != 1) {
+ dev_warn(dev, "Failed to set screenpad_brightness (result): 0x%x\n", result);
+ return -EIO;
+ }
+
+ sysfs_notify(&asus->platform_device->dev.kobj, NULL, "screenpad_brightness");
+
+ return count;
+}
+static DEVICE_ATTR_RW(screenpad_brightness);
+
/* TUF Laptop Keyboard RGB Modes **********************************************/
static ssize_t kbd_rgb_mode_store(struct device *dev,
struct device_attribute *attr,
@@ -3465,6 +3576,8 @@ static struct attribute *platform_attributes[] = {
&dev_attr_egpu_enable.attr,
&dev_attr_dgpu_disable.attr,
&dev_attr_gpu_mux_mode.attr,
+ &dev_attr_screenpad_enable.attr,
+ &dev_attr_screenpad_brightness.attr,
&dev_attr_lid_resume.attr,
&dev_attr_als_enable.attr,
&dev_attr_fan_boost_mode.attr,
@@ -3497,6 +3610,10 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
ok = asus->dgpu_disable_available;
else if (attr == &dev_attr_gpu_mux_mode.attr)
ok = asus->gpu_mux_mode_available;
+ else if (attr == &dev_attr_screenpad_enable.attr)
+ ok = asus->screenpad_enable_available;
+ else if (attr == &dev_attr_screenpad_brightness.attr)
+ ok = asus->screenpad_brightness_available;
else if (attr == &dev_attr_fan_boost_mode.attr)
ok = asus->fan_boost_mode_available;
else if (attr == &dev_attr_throttle_thermal_policy.attr)
@@ -3760,6 +3877,10 @@ static int asus_wmi_add(struct platform_device *pdev)
asus->egpu_enable_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_EGPU);
asus->dgpu_disable_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_DGPU);
asus->gpu_mux_mode_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_GPU_MUX);
+ asus->screenpad_enable_available = asus_wmi_dev_is_present(asus,
+ ASUS_WMI_DEVID_SCREENPAD_DISABLE);
+ asus->screenpad_brightness_available = asus_wmi_dev_is_present(asus,
+ ASUS_WMI_DEVID_SCREENPAD_LIGHT);
asus->kbd_rgb_mode_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_TUF_RGB_MODE);
asus->kbd_rgb_state_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_TUF_RGB_STATE);
asus->panel_overdrive_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_PANEL_OD);
diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
index 28234dc9fa6a..978627aac87c 100644
--- a/include/linux/platform_data/x86/asus-wmi.h
+++ b/include/linux/platform_data/x86/asus-wmi.h
@@ -58,6 +58,10 @@
#define ASUS_WMI_DEVID_KBD_BACKLIGHT 0x00050021
#define ASUS_WMI_DEVID_LIGHT_SENSOR 0x00050022 /* ?? */
#define ASUS_WMI_DEVID_LIGHTBAR 0x00050025
+/* This can only be used to disable the screen, not re-enable */
+#define ASUS_WMI_DEVID_SCREENPAD_DISABLE 0x00050031
+/* Writing a brightness re-enables the screen if disabled */
+#define ASUS_WMI_DEVID_SCREENPAD_LIGHT 0x00050032
#define ASUS_WMI_DEVID_FAN_BOOST_MODE 0x00110018
#define ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY 0x00120075

--
2.40.0
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