regulators: Implement i2c_capture_bytes action
Implement the new i2c_capture_bytes action in the JSON configuration
file.
Create gtests to test the new class.
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: Ie43e147a0a076090729871140bb5889c74323d19
diff --git a/phosphor-regulators/src/actions/i2c_capture_bytes_action.cpp b/phosphor-regulators/src/actions/i2c_capture_bytes_action.cpp
new file mode 100644
index 0000000..728daeb
--- /dev/null
+++ b/phosphor-regulators/src/actions/i2c_capture_bytes_action.cpp
@@ -0,0 +1,78 @@
+/**
+ * Copyright © 2021 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "i2c_capture_bytes_action.hpp"
+
+#include "action_error.hpp"
+#include "i2c_interface.hpp"
+
+#include <exception>
+#include <ios>
+#include <sstream>
+
+namespace phosphor::power::regulators
+{
+
+bool I2CCaptureBytesAction::execute(ActionEnvironment& environment)
+{
+ try
+ {
+ // Read device register values. Use I2C mode where the number of bytes
+ // to read is explicitly specified.
+ i2c::I2CInterface& interface = getI2CInterface(environment);
+ uint8_t size{count}; // byte count parameter is input/output
+ uint8_t values[UINT8_MAX];
+ interface.read(reg, size, values, i2c::I2CInterface::Mode::I2C);
+
+ // Build additional error data key
+ std::ostringstream kss;
+ kss << environment.getDeviceID() << "_register_0x" << std::hex
+ << std::uppercase << static_cast<uint16_t>(reg);
+ std::string key = kss.str();
+
+ // Build additional error data value
+ std::ostringstream vss;
+ vss << "[ " << std::hex << std::uppercase;
+ for (unsigned int i = 0; i < count; ++i)
+ {
+ vss << ((i > 0) ? ", " : "") << "0x"
+ << static_cast<uint16_t>(values[i]);
+ }
+ vss << " ]";
+ std::string value = vss.str();
+
+ // Store additional error data in action environment
+ environment.addAdditionalErrorData(key, value);
+ }
+ catch (const i2c::I2CException& e)
+ {
+ // Nest I2CException within an ActionError so caller will have both the
+ // low level I2C error information and the action information
+ std::throw_with_nested(ActionError(*this));
+ }
+ return true;
+}
+
+std::string I2CCaptureBytesAction::toString() const
+{
+ std::ostringstream ss;
+ ss << "i2c_capture_bytes: { register: 0x" << std::hex << std::uppercase
+ << static_cast<uint16_t>(reg) << ", count: " << std::dec
+ << static_cast<uint16_t>(count) << " }";
+ return ss.str();
+}
+
+} // namespace phosphor::power::regulators
diff --git a/phosphor-regulators/src/actions/i2c_capture_bytes_action.hpp b/phosphor-regulators/src/actions/i2c_capture_bytes_action.hpp
new file mode 100644
index 0000000..c17e191
--- /dev/null
+++ b/phosphor-regulators/src/actions/i2c_capture_bytes_action.hpp
@@ -0,0 +1,125 @@
+/**
+ * Copyright © 2021 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include "action_environment.hpp"
+#include "i2c_action.hpp"
+
+#include <cstdint>
+#include <stdexcept>
+#include <string>
+
+namespace phosphor::power::regulators
+{
+
+/**
+ * @class I2CCaptureBytesAction
+ *
+ * Captures device register bytes to be stored in an error log. Communicates
+ * with the device directly using the I2C interface.
+ *
+ * Implements the i2c_capture_bytes action in the JSON config file.
+ */
+class I2CCaptureBytesAction : public I2CAction
+{
+ public:
+ // Specify which compiler-generated methods we want
+ I2CCaptureBytesAction() = delete;
+ I2CCaptureBytesAction(const I2CCaptureBytesAction&) = delete;
+ I2CCaptureBytesAction(I2CCaptureBytesAction&&) = delete;
+ I2CCaptureBytesAction& operator=(const I2CCaptureBytesAction&) = delete;
+ I2CCaptureBytesAction& operator=(I2CCaptureBytesAction&&) = delete;
+ virtual ~I2CCaptureBytesAction() = default;
+
+ /**
+ * Constructor.
+ *
+ * Throws an exception if any of the input parameters are invalid.
+ *
+ * @param reg Device register address. Note: named 'reg' because 'register'
+ * is a reserved keyword.
+ * @param count Number of bytes to read from the device register.
+ */
+ explicit I2CCaptureBytesAction(uint8_t reg, uint8_t count) :
+ reg{reg}, count{count}
+ {
+ if (count < 1)
+ {
+ throw std::invalid_argument{"Invalid byte count: Less than 1"};
+ }
+ }
+
+ /**
+ * Executes this action.
+ *
+ * Reads one or more bytes from a device register using the I2C interface.
+ * The resulting values are stored as additional error data in the specified
+ * action environment.
+ *
+ * All of the bytes will be read in a single I2C operation.
+ *
+ * The device register was specified in the constructor.
+ *
+ * The device is obtained from the action environment.
+ *
+ * Throws an exception if an error occurs.
+ *
+ * @param environment action execution environment
+ * @return true
+ */
+ virtual bool execute(ActionEnvironment& environment) override;
+
+ /**
+ * Returns the number of bytes to read from the device register.
+ *
+ * @return byte count
+ */
+ uint8_t getCount() const
+ {
+ return count;
+ }
+
+ /**
+ * Returns the device register address.
+ *
+ * @return register address
+ */
+ uint8_t getRegister() const
+ {
+ return reg;
+ }
+
+ /**
+ * Returns a string description of this action.
+ *
+ * @return description of action
+ */
+ virtual std::string toString() const override;
+
+ private:
+ /**
+ * Device register address. Note: named 'reg' because 'register' is a
+ * reserved keyword.
+ */
+ const uint8_t reg;
+
+ /**
+ * Number of bytes to read from the device register.
+ */
+ const uint8_t count;
+};
+
+} // namespace phosphor::power::regulators