i2cslave: add i2cslave api and basic non functional implementation

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

src/i2c/i2cslave.cxx

@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) Intel Corporation.
+ *
+ * Author: Brendan Le Foll
+ *                                                                                                                                                             
+ * Copyright © 2014 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 "i2cslave.h"
+
+using namespace maa;
+
+I2CSlave::I2CSlave(unsigned int sda, unsigned int scl)
+{
+    // Galileo only has one I2CSlave device which is always /dev/i2c-0
+    // reliability is a fickle friend!
+    if (i2c_handle = open("/dev/i2c-0", O_RDWR) < 1) {
+        fprintf(stderr, "Failed to open requested i2c port");
+    }
+}
+
+void
+I2CSlave::frequency(int hz)
+{
+    _hz = hz;
+}
+
+int
+I2CSlave::read(char *data, int length)
+{
+    return 0;
+}
+
+int
+I2CSlave::read(void)
+{
+    int byte;
+    if (byte = i2c_smbus_read_byte(i2c_handle) < 0) {
+        return -1;
+    }
+    return byte;
+}
+
+int
+I2CSlave::write(const char *data, int length)
+{
+    if (i2c_smbus_write_i2c_block_data(i2c_handle, data[0], length, (uint8_t*) data) < 0) {
+        fprintf(stderr, "Failed to write to I2CSlave slave\n");
+	return -1;
+    }
+    return 0;
+}
+
+int
+I2CSlave::write(int data)
+{
+    if (i2c_smbus_write_byte(i2c_handle, data) < 0) {
+        fprintf(stderr, "Failed to write to I2CSlave slave\n");
+	return -1;
+    }
+    return 0;
+}
+
+void
+I2CSlave::address(int address)
+{
+}
+
+void
+I2CSlave::stop()
+{
+}