Expose a WMI method in sysfs platform for showing which connected
charger the laptop is currently using.
Signed-off-by: Luke D. Jones <luke@xxxxxxxxxx>
---
.../ABI/testing/sysfs-platform-asus-wmi | 10 +++++++++
drivers/platform/x86/asus-wmi.c | 21 +++++++++++++++++++
include/linux/platform_data/x86/asus-wmi.h | 3 +++
3 files changed, 34 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-platform-asus-wmi b/Documentation/ABI/testing/sysfs-platform-asus-wmi
index a77a004a1baa..eb29e3023c7b 100644
--- a/Documentation/ABI/testing/sysfs-platform-asus-wmi
+++ b/Documentation/ABI/testing/sysfs-platform-asus-wmi
@@ -98,3 +98,13 @@ Description:
Enable an LCD response-time boost to reduce or remove ghosting:
* 0 - Disable,
* 1 - Enable
+
+What: /sys/devices/platform/<platform>/charge_mode
+Date: Jun 2023
+KernelVersion: 6.5
+Contact: "Luke Jones" <luke@xxxxxxxxxx>
+Description:
+ Get the current charging mode being used:
+ * 1 - Barrel connected charger,
+ * 2 - USB-C charging
+ * 3 - Both connected, barrel used for charging
\ No newline at end of file
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 1038dfdcdd32..f23375d5fb82 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -237,6 +237,7 @@ struct asus_wmi {
u8 fan_boost_mode_mask;
u8 fan_boost_mode;
+ bool charge_mode_available;
bool egpu_enable_available;
bool dgpu_disable_available;
bool gpu_mux_mode_available;
@@ -586,6 +587,22 @@ static void asus_wmi_tablet_mode_get_state(struct asus_wmi *asus)
asus_wmi_tablet_sw_report(asus, result);
}
+/* Charging mode, 1=Barrel, 2=USB ******************************************/
+static ssize_t charge_mode_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct asus_wmi *asus = dev_get_drvdata(dev);
+ int result, value;
+
+ result = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_CHARGE_MODE, &value);
+ if (result < 0)
+ return result;
+
+ return sysfs_emit(buf, "%d\n", value & 0xff);
+}
+
+static DEVICE_ATTR_RO(charge_mode);
+
/* dGPU ********************************************************************/
static ssize_t dgpu_disable_show(struct device *dev,
struct device_attribute *attr, char *buf)
@@ -3462,6 +3479,7 @@ static struct attribute *platform_attributes[] = {
&dev_attr_camera.attr,
&dev_attr_cardr.attr,
&dev_attr_touchpad.attr,
+ &dev_attr_charge_mode.attr,
&dev_attr_egpu_enable.attr,
&dev_attr_dgpu_disable.attr,
&dev_attr_gpu_mux_mode.attr,
@@ -3491,6 +3509,8 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
devid = ASUS_WMI_DEVID_LID_RESUME;
else if (attr == &dev_attr_als_enable.attr)
devid = ASUS_WMI_DEVID_ALS_ENABLE;
+ else if (attr == &dev_attr_charge_mode.attr)
+ ok = asus->charge_mode_available;
else if (attr == &dev_attr_egpu_enable.attr)
ok = asus->egpu_enable_available;
else if (attr == &dev_attr_dgpu_disable.attr)
@@ -3757,6 +3777,7 @@ static int asus_wmi_add(struct platform_device *pdev)
if (err)
goto fail_platform;
+ asus->charge_mode_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_CHARGE_MODE);
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);
diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
index 28234dc9fa6a..f90cafe26af1 100644
--- a/include/linux/platform_data/x86/asus-wmi.h
+++ b/include/linux/platform_data/x86/asus-wmi.h
@@ -95,6 +95,9 @@
/* Keyboard dock */
#define ASUS_WMI_DEVID_KBD_DOCK 0x00120063
+/* Charging mode - 1=Barrel, 2=USB */
+#define ASUS_WMI_DEVID_CHARGE_MODE 0x0012006C
+
/* dgpu on/off */
#define ASUS_WMI_DEVID_EGPU 0x00090019
--
2.41.0
