platform/x86: intel-vbtn: Use acpi_evaluate_integer()

Use acpi_evaluate_integer() instead of open-coding it.

This is a preparation patch for adding a intel_vbtn_has_switches()
helper function.

Fixes: de9647efeaa9 ("platform/x86: intel-vbtn: Only activate tablet mode switch on 2-in-1's")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

diff --git a/drivers/platform/x86/intel-vbtn.c b/drivers/platform/x86/intel-vbtn.c
index b588093..191894d 100644 (file)
--- a/drivers/platform/x86/intel-vbtn.c
+++ b/drivers/platform/x86/intel-vbtn.c
@@ -119,28 +119,21 @@ static void detect_tablet_mode(struct platform_device *device)
        const char *chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
        struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
        acpi_handle handle = ACPI_HANDLE(&device->dev);
-       struct acpi_buffer vgbs_output = { ACPI_ALLOCATE_BUFFER, NULL };
-       union acpi_object *obj;
+       unsigned long long vgbs;
        acpi_status status;
        int m;
 
        if (!(chassis_type && strcmp(chassis_type, "31") == 0))
-               goto out;
+               return;
 
-       status = acpi_evaluate_object(handle, "VGBS", NULL, &vgbs_output);
+       status = acpi_evaluate_integer(handle, "VGBS", NULL, &vgbs);
        if (ACPI_FAILURE(status))
-               goto out;
-
-       obj = vgbs_output.pointer;
-       if (!(obj && obj->type == ACPI_TYPE_INTEGER))
-               goto out;
+               return;
 
-       m = !(obj->integer.value & TABLET_MODE_FLAG);
+       m = !(vgbs & TABLET_MODE_FLAG);
        input_report_switch(priv->input_dev, SW_TABLET_MODE, m);
-       m = (obj->integer.value & DOCK_MODE_FLAG) ? 1 : 0;
+       m = (vgbs & DOCK_MODE_FLAG) ? 1 : 0;
        input_report_switch(priv->input_dev, SW_DOCK, m);
-out:
-       kfree(vgbs_output.pointer);
 }
 
 static int intel_vbtn_probe(struct platform_device *device)