drivers/rpm/pcf8583: minor cleanup

- split out header and main
 - move to ModuleParams
 - add copyright header to all new files
 - don't store unnecessary state

src/drivers/rpm/pcf8583/pcf8583_main.cpp

@@ -0,0 +1,142 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2020 PX4 Development Team. All rights reserved.
+ *
+ * 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 PX4 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.
+ *
+ ****************************************************************************/
+
+#include "PCF8583.hpp"
+
+#include <px4_platform_common/getopt.h>
+
+namespace pcf8583
+{
+PCF8583 *g_dev{nullptr};
+
+static int start(int i2c_bus)
+{
+	if (g_dev != nullptr) {
+		PX4_WARN("already started");
+		return 0;
+	}
+
+	// create the driver
+	g_dev = new PCF8583(i2c_bus);
+
+	if (g_dev == nullptr) {
+		PX4_ERR("driver alloc failed");
+		return -1;
+	}
+
+	if (g_dev->init() != PX4_OK) {
+		PX4_ERR("driver init failed");
+		delete g_dev;
+		g_dev = nullptr;
+		return -1;
+	}
+
+	PX4_INFO("pcf8583 for bus: %d started.", i2c_bus);
+
+	return 0;
+}
+
+static int stop()
+{
+	if (g_dev == nullptr) {
+		PX4_WARN("driver not running");
+		return -1;
+	}
+
+	delete g_dev;
+	g_dev = nullptr;
+
+	return 0;
+}
+
+static int status()
+{
+	if (g_dev == nullptr) {
+		PX4_INFO("driver not running");
+		return 0;
+	}
+
+	g_dev->print_info();
+
+	return 0;
+}
+
+static int usage()
+{
+	PX4_INFO("missing command: try 'start', 'stop', 'status'");
+	PX4_INFO("options:");
+	PX4_INFO("    -b i2cbus (%d)", PX4_I2C_BUS_EXPANSION);
+
+	return 0;
+}
+
+} // namespace pcf8583
+
+extern "C" int pcf8583_main(int argc, char *argv[])
+{
+	int i2c_bus = PX4_I2C_BUS_EXPANSION;
+	int myoptind = 1;
+	int ch = 0;
+	const char *myoptarg = nullptr;
+
+	// start options
+	while ((ch = px4_getopt(argc, argv, "b:", &myoptind, &myoptarg)) != EOF) {
+		switch (ch) {
+		case 'b':
+			i2c_bus = atoi(myoptarg);
+			break;
+
+		default:
+			return pcf8583::usage();
+		}
+	}
+
+	if (myoptind >= argc) {
+		pcf8583::usage();
+		return -1;
+	}
+
+	const char *verb = argv[myoptind];
+
+	if (!strcmp(verb, "start")) {
+		return pcf8583::start(i2c_bus);
+
+	} else if (!strcmp(verb, "stop")) {
+		return pcf8583::stop();
+
+	} else if (!strcmp(verb, "status")) {
+		return pcf8583::status();
+	}
+
+	return pcf8583::usage();
+}