platform/x86: asus-wmi: add support for showing charger mode

Expose a WMI method in sysfs platform for showing which connected
charger the laptop is currently using.

Signed-off-by: Luke D. Jones <luke@ljones.dev>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230630053552.976579-2-luke@ljones.dev
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/Documentation/ABI/testing/sysfs-platform-asus-wmi b/Documentation/ABI/testing/sysfs-platform-asus-wmi
index a77a004..eb29e30 100644 (file)
--- 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@ljones.dev>
+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 1038dfd..f23375d 100644 (file)
--- 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 28234dc..f90cafe 100644 (file)
--- 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