intel-hid: Disable button array during suspend-to-idle

Notice that intel_button_array_enable() never disables the power
button which is the only one needed to wake up the system from
suspend-to-idle, so it can be safely called during suspend-to-idle
as well as during "regular" system suspend, and rearrange the
code in the driver's "suspend" and "resume" callbacks accordingly.

While at it, use pm_suspend_no_platform() to check if the current
suspend-resume cycle is suspend-to-idle, as that is the only
case when the device should be enabled while suspended.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/intel-hid.c

@@ -274,10 +274,11 @@ static void intel_hid_pm_complete(struct device *device)
 
 static int intel_hid_pl_suspend_handler(struct device *device)
 {
-	if (pm_suspend_via_firmware()) {
+	intel_button_array_enable(device, false);
+
+	if (!pm_suspend_no_platform())
 		intel_hid_set_enable(device, false);
-		intel_button_array_enable(device, false);
-	}
+
 	return 0;
 }
 
@@ -285,10 +286,10 @@ static int intel_hid_pl_resume_handler(struct device *device)
 {
 	intel_hid_pm_complete(device);
 
-	if (pm_resume_via_firmware()) {
+	if (!pm_suspend_no_platform())
 		intel_hid_set_enable(device, true);
-		intel_button_array_enable(device, true);
-	}
+
+	intel_button_array_enable(device, true);
 	return 0;
 }