sx6119: Initial implementation

This was tested with the Grove FM Receiver.  Unfortunately, there is
no documentation on how to control the device using the D1 and D2 pins
that Seeed provides.  There is a switch on the device that can control
all of the elements, power, volume, and seek +/-.

The supplied example can turn the device on, and do a seek, but not
much else.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/sx6119/sx6119.cxx

@@ -0,0 +1,76 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2015 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <unistd.h>
+#include <iostream>
+
+#include "sx6119.h"
+
+using namespace upm;
+using namespace std;
+
+SX6119::SX6119(int powerPin, int seekPin)
+{
+  if ( !(m_gpioPower = mraa_gpio_init(powerPin)) )
+    {
+      cerr << __FUNCTION__ << ": mraa_gpio_init() failed" << endl;
+      return;
+    }
+
+  mraa_gpio_dir(m_gpioPower, MRAA_GPIO_OUT);
+  mraa_gpio_write(m_gpioPower, 1);
+
+  if ( !(m_gpioSeek = mraa_gpio_init(seekPin)) )
+    {
+      cerr << __FUNCTION__ << ": mraa_gpio_init() failed" << endl;
+      return;
+    }
+
+  mraa_gpio_dir(m_gpioSeek, MRAA_GPIO_OUT);
+  mraa_gpio_write(m_gpioSeek, 1);
+}
+
+SX6119::~SX6119()
+{
+  mraa_gpio_close(m_gpioPower);
+  mraa_gpio_close(m_gpioSeek);
+}
+
+void SX6119::togglePower()
+{
+  // this is just a toggle -- we set LOW for one second and power will
+  // be turned on or off depending on the previous condition.
+  mraa_gpio_write(m_gpioPower, 0);
+  sleep(1);
+  mraa_gpio_write(m_gpioPower, 1);
+}
+
+void SX6119::seek()
+{
+  // this is just a trigger -- we set LOW for 500ms to seek to the
+  // next available station, wrapping around when we reach the end.
+  mraa_gpio_write(m_gpioSeek, 0);
+  usleep(500000);
+  mraa_gpio_write(m_gpioSeek, 1);
+}