dell-rbtn: Ignore ACPI notifications if device is suspended

Some BIOSes unconditionally send an ACPI notification to RBTN when the
system is resuming from suspend. This makes dell-rbtn send an input
event to userspace as if a function key was pressed. Prevent this by
ignoring all the notifications received while the device is suspended.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=106031
Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Tested-by: Alex Hung <alex.hung@canonical.com>
Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/platform/x86/dell-rbtn.c b/drivers/platform/x86/dell-rbtn.c
index b51a2008d782..dcd9f40a4b18 100644
--- a/drivers/platform/x86/dell-rbtn.c
+++ b/drivers/platform/x86/dell-rbtn.c
@@ -28,6 +28,7 @@ struct rbtn_data {
         enum rbtn_type type;
         struct rfkill *rfkill;
         struct input_dev *input_dev;
+        bool suspended;
 };
 
 
@@ -235,9 +236,55 @@ static const struct acpi_device_id rbtn_ids[] = {
         { "", 0 },
 };
 
+#ifdef CONFIG_PM_SLEEP
+static void ACPI_SYSTEM_XFACE rbtn_clear_suspended_flag(void *context)
+{
+        struct rbtn_data *rbtn_data = context;
+
+        rbtn_data->suspended = false;
+}
+
+static int rbtn_suspend(struct device *dev)
+{
+        struct acpi_device *device = to_acpi_device(dev);
+        struct rbtn_data *rbtn_data = acpi_driver_data(device);
+
+        rbtn_data->suspended = true;
+
+        return 0;
+}
+
+static int rbtn_resume(struct device *dev)
+{
+        struct acpi_device *device = to_acpi_device(dev);
+        struct rbtn_data *rbtn_data = acpi_driver_data(device);
+        acpi_status status;
+
+        /*
+         * Upon resume, some BIOSes send an ACPI notification thet triggers
+         * an unwanted input event. In order to ignore it, we use a flag
+         * that we set at suspend and clear once we have received the extra
+         * ACPI notification. Since ACPI notifications are delivered
+         * asynchronously to drivers, we clear the flag from the workqueue
+         * used to deliver the notifications. This should be enough
+         * to have the flag cleared only after we received the extra
+         * notification, if any.
+         */
+        status = acpi_os_execute(OSL_NOTIFY_HANDLER,
+                         rbtn_clear_suspended_flag, rbtn_data);
+        if (ACPI_FAILURE(status))
+                rbtn_clear_suspended_flag(rbtn_data);
+
+        return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(rbtn_pm_ops, rbtn_suspend, rbtn_resume);
+
 static struct acpi_driver rbtn_driver = {
         .name = "dell-rbtn",
         .ids = rbtn_ids,
+        .drv.pm = &rbtn_pm_ops,
         .ops = {
                 .add = rbtn_add,
                 .remove = rbtn_remove,
@@ -399,6 +446,15 @@ static void rbtn_notify(struct acpi_device *device, u32 event)
 {
         struct rbtn_data *rbtn_data = device->driver_data;
 
+        /*
+         * Some BIOSes send a notification at resume.
+         * Ignore it to prevent unwanted input events.
+         */
+        if (rbtn_data->suspended) {
+                dev_dbg(&device->dev, "ACPI notification ignored\n");
+                return;
+        }
+
         if (event != 0x80) {
                 dev_info(&device->dev, "Received unknown event (0x%x)\n",
                          event);