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Subject[PATCH 1/3] asus-wmi: Add panel overdrive functionality
Date
Some ASUS ROG laptops have the ability to drive the display panel
a a higher rate to eliminate or reduce ghosting.

Signed-off-by: Luke D. Jones <luke@ljones.dev>
---
drivers/platform/x86/asus-wmi.c | 92 ++++++++++++++++++++++
include/linux/platform_data/x86/asus-wmi.h | 1 +
2 files changed, 93 insertions(+)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index ebaeb7bb80f5..2468076d6cd8 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -216,6 +216,9 @@ struct asus_wmi {
// The RSOC controls the maximum charging percentage.
bool battery_rsoc_available;

+ bool panel_overdrive_available;
+ u8 panel_overdrive;
+
struct hotplug_slot hotplug_slot;
struct mutex hotplug_lock;
struct mutex wmi_lock;
@@ -1221,6 +1224,87 @@ static int asus_wmi_rfkill_init(struct asus_wmi *asus)
return result;
}

+/* Panel Overdrive ************************************************************/
+static int panel_od_check_present(struct asus_wmi *asus)
+{
+ u32 result;
+ int err;
+
+ asus->panel_overdrive_available = false;
+
+ err = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_PANEL_OD, &result);
+ if (err) {
+ if (err == -ENODEV)
+ return 0;
+ return err;
+ }
+
+ if (result & ASUS_WMI_DSTS_PRESENCE_BIT)
+ asus->panel_overdrive_available = true;
+ asus->panel_overdrive = result & ASUS_WMI_DSTS_STATUS_BIT;
+
+ return 0;
+}
+
+static int panel_od_write(struct asus_wmi *asus)
+{
+ int err;
+ u8 value;
+ u32 retval;
+
+ value = asus->panel_overdrive;
+
+ err = asus_wmi_set_devstate(ASUS_WMI_DEVID_PANEL_OD, value, &retval);
+
+ sysfs_notify(&asus->platform_device->dev.kobj, NULL,
+ "panel_od");
+
+ if (err) {
+ pr_warn("Failed to set panel overdrive: %d\n", err);
+ return err;
+ }
+
+ if (retval > 1 || retval < 0) {
+ pr_warn("Failed to set panel overdrive (retval): 0x%x\n",
+ retval);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static ssize_t panel_od_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct asus_wmi *asus = dev_get_drvdata(dev);
+ u8 mode = asus->panel_overdrive;
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", mode);
+}
+
+static ssize_t panel_od_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int result;
+ u8 overdrive;
+ struct asus_wmi *asus = dev_get_drvdata(dev);
+
+ result = kstrtou8(buf, 10, &overdrive);
+ if (result < 0)
+ return result;
+
+ if (overdrive > 1 || overdrive < 0)
+ return -EINVAL;
+
+ asus->panel_overdrive = overdrive;
+ panel_od_write(asus);
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(panel_od);
+
/* Quirks *********************************************************************/

static void asus_wmi_set_xusb2pr(struct asus_wmi *asus)
@@ -2332,6 +2416,7 @@ static struct attribute *platform_attributes[] = {
&dev_attr_als_enable.attr,
&dev_attr_fan_boost_mode.attr,
&dev_attr_throttle_thermal_policy.attr,
+ &dev_attr_panel_od.attr,
NULL
};

@@ -2357,6 +2442,8 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
ok = asus->fan_boost_mode_available;
else if (attr == &dev_attr_throttle_thermal_policy.attr)
ok = asus->throttle_thermal_policy_available;
+ else if (attr == &dev_attr_panel_od.attr)
+ ok = asus->panel_overdrive_available;

if (devid != -1)
ok = !(asus_wmi_get_devstate_simple(asus, devid) < 0);
@@ -2622,6 +2709,10 @@ static int asus_wmi_add(struct platform_device *pdev)
else
throttle_thermal_policy_set_default(asus);

+ err = panel_od_check_present(asus);
+ if (err)
+ goto fail_panel_od;
+
err = asus_wmi_sysfs_init(asus->platform_device);
if (err)
goto fail_sysfs;
@@ -2709,6 +2800,7 @@ static int asus_wmi_add(struct platform_device *pdev)
fail_throttle_thermal_policy:
fail_fan_boost_mode:
fail_platform:
+fail_panel_od:
kfree(asus);
return err;
}
diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
index 2f274cf52805..428aea701c7b 100644
--- a/include/linux/platform_data/x86/asus-wmi.h
+++ b/include/linux/platform_data/x86/asus-wmi.h
@@ -61,6 +61,7 @@
#define ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY 0x00120075

/* Misc */
+#define ASUS_WMI_DEVID_PANEL_OD 0x00050019
#define ASUS_WMI_DEVID_CAMERA 0x00060013
#define ASUS_WMI_DEVID_LID_FLIP 0x00060062

--
2.31.1
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