[powerkey] Add "nop" powerkey action

If single and double press actions are exactly the same, mce does not wait
or expect to see double presses. In some cases this is desirable, in other
cases it is not.

Having a no-operation action available allows configuring single and
double press action lists so that they differ from each other while are
still logically equivalent.

Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

powerkey.c

@@ -161,6 +161,7 @@ static void  pwrkey_action_dbus7    (void);
 static void  pwrkey_action_dbus8    (void);
 static void  pwrkey_action_dbus9    (void);
 static void  pwrkey_action_dbus10   (void);
+static void  pwrkey_action_nop      (void);
 
 /* ------------------------------------------------------------------------- *
  * ACTION_SETS
@@ -934,6 +935,12 @@ pwrkey_action_dbus10(void)
     pwrkey_dbus_action_execute(9);
 }
 
+static void
+pwrkey_action_nop(void)
+{
+    /* Do nothing */
+}
+
 /* ========================================================================= *
  * ACTION_SETS
  * ========================================================================= */
@@ -1020,6 +1027,12 @@ static const pwrkey_bitconf_t pwrkey_action_lut[] =
         .name = "dbus10",
         .func = pwrkey_action_dbus10,
     },
+
+    // Low priority placeholder/dummy action
+    {
+        .name = "nop",
+        .func = pwrkey_action_nop,
+    },
 };
 
 static void

tools/mcetool.c

@@ -4158,6 +4158,7 @@ static bool xmce_is_powerkey_action(const char *name)
                 "dbus8",
                 "dbus9",
                 "dbus10",
+                "nop",
         };
 
         for( size_t i = 0; i < G_N_ELEMENTS(lut); ++i ) {
@@ -6119,6 +6120,10 @@ static const mce_opt_t options[] =
                         "  dbus3    - send dbus signal or make method call\n"
                         "   ...\n"
                         "  dbus10   - send dbus signal or make method call\n"
+                        "  nop      - dummy operation, for differentiating otherwise\n"
+                        "             identical single/double press actions (mce does not\n"
+                        "             wait for double presses double press actions are\n"
+                        "             the same as for a single press)\n"
                         "\n"
                         "Comma separated list of actions can be used.\n"
         },