From e9b604914c76d86cc2e4bb86bc5b8051e127f5c1 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Wed, 3 Aug 2016 12:45:16 -0600
Subject: [PATCH] config/sim:  Add logic to set the simulated I/O expander for
 testing with apps/examples/gpio

---
 configs/sim/src/Makefile         |  5 ++
 configs/sim/src/sim_gpio.c       |  4 +-
 configs/sim/src/sim_ioexpander.c | 89 ++++++++++++++++++++++++++++++++
 3 files changed, 96 insertions(+), 2 deletions(-)
 create mode 100644 configs/sim/src/sim_ioexpander.c

diff --git a/configs/sim/src/Makefile b/configs/sim/src/Makefile
index 63fcbca040..e56c82ae36 100644
--- a/configs/sim/src/Makefile
+++ b/configs/sim/src/Makefile
@@ -65,7 +65,12 @@ endif
 endif
 
 ifeq ($(CONFIG_EXAMPLES_GPIO),y)
+ifeq ($(CONFIG_GPIO_LOWER_HALF),y)
+  CSRCS += sim_ioexpander.c
+else
   CSRCS += sim_gpio.c
 endif
+endif
+
 
 include $(TOPDIR)/configs/Board.mk
diff --git a/configs/sim/src/sim_gpio.c b/configs/sim/src/sim_gpio.c
index 6dba310bba..bd9c499457 100644
--- a/configs/sim/src/sim_gpio.c
+++ b/configs/sim/src/sim_gpio.c
@@ -49,7 +49,7 @@
 
 #include "sim.h"
 
-#ifdef CONFIG_EXAMPLES_GPIO
+#if defined(CONFIG_EXAMPLES_GPIO) && !defined(CONFIG_GPIO_LOWER_HALF)
 
 /****************************************************************************
  * Private Types
@@ -231,4 +231,4 @@ int sim_gpio_initialize(void)
   (void)gpio_pin_register(&g_gpint.simgpio.gpio, 2);
   return 0;
 }
-#endif /* CONFIG_EXAMPLES_GPIO */
+#endif /* CONFIG_EXAMPLES_GPIO && !CONFIG_GPIO_LOWER_HALF */
diff --git a/configs/sim/src/sim_ioexpander.c b/configs/sim/src/sim_ioexpander.c
new file mode 100644
index 0000000000..01cdb77ddf
--- /dev/null
+++ b/configs/sim/src/sim_ioexpander.c
@@ -0,0 +1,89 @@
+/****************************************************************************
+ * configs/sim/src/sim_ioexpander.c
+ *
+ *   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+ *   Author:  Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/ioexpander/gpio.h>
+#include <nuttx/ioexpander/ioexpander.h>
+
+#include "up_internal.h"
+#include "sim.h"
+
+#if defined(CONFIG_EXAMPLES_GPIO) && defined(CONFIG_GPIO_LOWER_HALF)
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sim_gpio_initialize
+ *
+ * Description:
+ *   Initialize simulated GPIO expander for use with /apps/examples/gpio
+ *
+ ****************************************************************************/
+
+int sim_gpio_initialize(void)
+{
+  /* Get an instance of the simulated I/O expander */
+
+  FAR struct ioexpander_dev_s *ioe = sim_ioexpander_initialize();
+  if (ioe == NULL)
+    {
+      gpioerr("ERROR: sim_ioexpander_initialize failed\n");
+      return -ENOMEM;
+    }
+
+  /* Register three pin drivers */
+
+  (void)IOEXP_SETDIRECTION(ioe, 0, IOEXPANDER_DIRECTION_IN);
+  (void)gpio_lower_half(ioe, 0, GPIO_INPUT_PIN, 0);
+
+  (void)IOEXP_SETDIRECTION(ioe, 1, IOEXPANDER_DIRECTION_OUT);
+  (void)gpio_lower_half(ioe, 1, GPIO_OUTPUT_PIN, 1);
+
+  (void)IOEXP_SETDIRECTION(ioe, 2, IOEXPANDER_DIRECTION_IN);
+  (void)gpio_lower_half(ioe, 2, GPIO_INTERRUPT_PIN, 2);
+
+  return 0;
+}
+#endif /* CONFIG_EXAMPLES_GPIO && CONFIG_GPIO_LOWER_HALF */