Button upper half driver: Add definitions needed for compilation with the poll() interface is not disabled.

drivers/input/Kconfig

@@ -331,7 +331,7 @@ config BUTTONS
 if BUTTONS
 
 config BUTTONS_LOWER
-	bool "Generic Lower Half Button Dirver"
+	bool "Generic Lower Half Button Driver"
 	default n
 	depends on ARCH_BUTTONS && ARCH_IRQBUTTONS
 	---help---

drivers/input/button_upper.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * drivers/input/button_upper.c
  *
- *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2015-2016 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -230,8 +230,8 @@ static void btn_enable(FAR struct btn_upperhalf_s *priv)
             {
               /* Yes.. OR in the poll event buttons */
 
-              press   |= opriv->bo_pollevents.ap_press;
+              press   |= opriv->bo_pollevents.bp_press;
-              release |= opriv->bo_pollevents.ap_release;
+              release |= opriv->bo_pollevents.bp_release;
               break;
             }
         }
@@ -322,8 +322,8 @@ static void btn_sample(FAR struct btn_upperhalf_s *priv)
    * newly released.
    */
 
-  change  = sample ^ priv->bu_sample;
+  change = sample ^ priv->bu_sample;
-  press   = change & sample;
+  press  = change & sample;
 
   DEBUGASSERT(lower->bl_supported);
   release = change & (lower->bl_supported(lower) & ~sample);
@@ -335,8 +335,8 @@ static void btn_sample(FAR struct btn_upperhalf_s *priv)
 #ifndef CONFIG_DISABLE_POLL
       /* Have any poll events occurred? */
 
-      if ((press & opriv->bo_pollevents.ap_press)     != 0 ||
+      if ((press & opriv->bo_pollevents.bp_press)     != 0 ||
-          (release & opriv->bo_pollevents.ap_release) != 0)
+          (release & opriv->bo_pollevents.bp_release) != 0)
         {
           /* Yes.. Notify all waiters */
 
@@ -431,8 +431,8 @@ static int btn_open(FAR struct file *filep)
   DEBUGASSERT(lower && lower->bl_supported);
   supported = lower->bl_supported(lower);
 
-  opriv->bo_pollevents.ap_press   = supported;
+  opriv->bo_pollevents.bp_press   = supported;
-  opriv->bo_pollevents.ap_release = supported;
+  opriv->bo_pollevents.bp_release = supported;
 #endif
 
   /* Attach the open structure to the device */
@@ -664,8 +664,8 @@ static int btn_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
           {
             /* Save the poll events */
 
-            opriv->bo_pollevents.ap_press   = pollevents->ap_press;
+            opriv->bo_pollevents.bp_press   = pollevents->bp_press;
-            opriv->bo_pollevents.ap_release = pollevents->ap_release;
+            opriv->bo_pollevents.bp_release = pollevents->bp_release;
 
             /* Enable/disable interrupt handling */
 

include/nuttx/input/ajoystick.h

@@ -61,6 +61,7 @@
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
+
 /* Configuration ************************************************************/
 
 #ifndef CONFIG_AJOYSTICK_NPOLLWAITERS
@@ -159,6 +160,7 @@
 /****************************************************************************
  * Public Types
  ****************************************************************************/
+
 /* This type is a bit set that contains the state of all analog joystick
  * buttons.
  */

include/nuttx/input/buttons.h

@@ -1,7 +1,7 @@
 /************************************************************************************
  * include/nuttx/input/buttons.h
  *
- *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2015-2016 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -46,6 +46,7 @@
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
+
 /* Configuration ************************************************************/
 
 #ifndef CONFIG_BUTTONS_NPOLLWAITERS
@@ -64,6 +65,17 @@
 
 #define BTNIOC_SUPPORTED  _BTNIOC(0x0001)
 
+/* Command:     BTNIOC_POLLEVENTS
+ * Description: Specify the set of button events that can cause a poll()
+ *              to awaken.  The default is all button depressions and all
+ *              button releases (all supported buttons);
+ * Argument:    A read-only pointer to an instance of struct ajoy_pollevents_s
+ * Return:      Zero (OK) on success.  Minus one will be returned on failure
+ *              with the errno value set appropriately.
+ */
+
+#define BTNIOC_POLLEVENTS _BTNIOC(0x0002)
+
 /* Command:     BTNIOC_REGISTER
  * Description: Register to receive a signal whenever there is a change in
  *              the state of button inputs.  This feature, of course, depends
@@ -73,11 +85,12 @@
  *              with the errno value set appropriately.
  */
 
-#define BTNIOC_REGISTER   _BTNIOC(0x0002)
+#define BTNIOC_REGISTER   _BTNIOC(0x0003)
 
 /****************************************************************************
  * Public Types
  ****************************************************************************/
+
 /* This type is a bit set that contains the state of all buttons as defined
  * in arch/board/board.h.  This is the value that is returned when reading
  * from the button driver.
@@ -85,6 +98,17 @@
 
 typedef uint8_t btn_buttonset_t;
 
+/* A reference to this structure is provided with the BTNIOC_POLLEVENTS IOCTL
+ * command and describes the conditions under which the client would like
+ * to receive notification.
+ */
+
+struct btn_pollevents_s
+{
+  btn_buttonset_t bp_press;   /* Set of button depressions to wake up the poll */
+  btn_buttonset_t bp_release; /* Set of button releases to wake up the poll */
+};
+
 /* A reference to this structure is provided with the BTNIOC_REGISTER IOCTL
  * command and describes the conditions under which the client would like
  * to receive notification.