[PATCH] platform/x86: intel-vbtn: Simplify autorelease logic

[Darren Hart (VMware)]

The new notify_handler logic determining if autorelease should be used or
not is a bit awkward, and can result in more than one call to
sparse_keymap_report_event for the same event (scancode). The nesting
and long lines also made it difficult to read.

Simplify the logic by eliminating a level of nesting with a goto and
always calculate autorelease and val so we can make a single call to
sparse_keymap_report_event.

Signed-off-by: Darren Hart (VMware) <dvh...@infradead.org>
Cc: Stefan Brüns <stefan.bru...@rwth-aachen.de>
Cc: AceLan Kao <acelan....@canonical.com>
---
Note: This is based on top of Stefan's v2 patch series for intel-vbtn, currently
      in my review-dvhart branch.

 drivers/platform/x86/intel-vbtn.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/drivers/platform/x86/intel-vbtn.c 
b/drivers/platform/x86/intel-vbtn.c
index 0861efe..297e1ac 100644
--- a/drivers/platform/x86/intel-vbtn.c
+++ b/drivers/platform/x86/intel-vbtn.c
@@ -80,6 +80,7 @@ static void notify_handler(acpi_handle handle, u32 event, 
void *context)
 {
        struct platform_device *device = context;
        struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
+       unsigned int val = !(event & 1); /* Even=press, Odd=release */
        const struct key_entry *ke_rel;
        bool autorelease;
 
@@ -88,20 +89,20 @@ static void notify_handler(acpi_handle handle, u32 event, 
void *context)
                        pm_wakeup_hard_event(&device->dev);
                        return;
                }
-       } else {
-               /* Use the fact press/release come in even/odd pairs */
-               if ((event & 1) && sparse_keymap_report_event(priv->input_dev,
-                                                             event, 0, false))
-                       return;
+               goto out_unknown;
+       }
 
-               ke_rel = sparse_keymap_entry_from_scancode(priv->input_dev,
-                                                          event | 1);
-               autorelease = !ke_rel || ke_rel->type == KE_IGNORE;
+       /*
+        * Event press events are autorelease if there is no corresponding odd
+        * release event, or if the odd event is KE_IGNORE.
+        */
+       ke_rel = sparse_keymap_entry_from_scancode(priv->input_dev, event | 1);
+       autorelease = val && (!ke_rel || ke_rel->type == KE_IGNORE);
 
-               if (sparse_keymap_report_event(priv->input_dev, event, 1,
-                                              autorelease))
-                       return;
-       }
+       if (sparse_keymap_report_event(priv->input_dev, event, val, 
autorelease))
+               return;
+
+out_unknown:
        dev_dbg(&device->dev, "unknown event index 0x%x\n", event);
 }
 
-- 
2.9.4


-- 
Darren Hart
VMware Open Source Technology Center