regulators: Implement i2c_write_bytes action
Implement the i2c_write_bytes action in the JSON config file. See
i2c_write_bytes.md for more information about this action.
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: Ifd4ef481f0a6b74bd3e5689a7b9f3a989ed5e214
diff --git a/phosphor-regulators/src/actions/i2c_write_bytes_action.cpp b/phosphor-regulators/src/actions/i2c_write_bytes_action.cpp
new file mode 100644
index 0000000..21b31f1
--- /dev/null
+++ b/phosphor-regulators/src/actions/i2c_write_bytes_action.cpp
@@ -0,0 +1,90 @@
+/**
+ * Copyright © 2020 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_write_bytes_action.hpp"
+
+#include "action_error.hpp"
+#include "i2c_interface.hpp"
+
+#include <exception>
+#include <ios>
+#include <sstream>
+
+namespace phosphor::power::regulators
+{
+
+bool I2CWriteBytesAction::execute(ActionEnvironment& environment)
+{
+ try
+ {
+ i2c::I2CInterface& interface = getI2CInterface(environment);
+ uint8_t valuesToWrite[UINT8_MAX];
+ if (masks.size() == 0)
+ {
+ for (unsigned int i = 0; i < values.size(); ++i)
+ {
+ valuesToWrite[i] = values[i];
+ }
+ }
+ else
+ {
+ // Read current device register values. Use I2C mode where the
+ // number of bytes to read is explicitly specified.
+ uint8_t size = values.size();
+ uint8_t currentValues[UINT8_MAX];
+ interface.read(reg, size, currentValues,
+ i2c::I2CInterface::Mode::I2C);
+
+ // Combine values to write with current values
+ for (unsigned int i = 0; i < values.size(); ++i)
+ {
+ valuesToWrite[i] =
+ (values[i] & masks[i]) | (currentValues[i] & (~masks[i]));
+ }
+ }
+
+ // Write values to device register
+ interface.write(reg, values.size(), valuesToWrite,
+ i2c::I2CInterface::Mode::I2C);
+ }
+ 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 I2CWriteBytesAction::toString() const
+{
+ std::ostringstream ss;
+ ss << "i2c_write_bytes: { register: 0x" << std::hex << std::uppercase
+ << static_cast<uint16_t>(reg) << ", values: [ ";
+ for (unsigned int i = 0; i < values.size(); ++i)
+ {
+ ss << ((i > 0) ? ", " : "") << "0x" << static_cast<uint16_t>(values[i]);
+ }
+ ss << " ], masks: [ ";
+ for (unsigned int i = 0; i < masks.size(); ++i)
+ {
+ ss << ((i > 0) ? ", " : "") << "0x" << static_cast<uint16_t>(masks[i]);
+ }
+ ss << " ] }";
+ return ss.str();
+}
+
+} // namespace phosphor::power::regulators
diff --git a/phosphor-regulators/src/actions/i2c_write_bytes_action.hpp b/phosphor-regulators/src/actions/i2c_write_bytes_action.hpp
new file mode 100644
index 0000000..edf2b2e
--- /dev/null
+++ b/phosphor-regulators/src/actions/i2c_write_bytes_action.hpp
@@ -0,0 +1,184 @@
+/**
+ * Copyright © 2020 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>
+#include <vector>
+
+namespace phosphor::power::regulators
+{
+
+/**
+ * @class I2CWriteBytesAction
+ *
+ * Writes bytes to a device register. Communicates with the device directly
+ * using the I2C interface.
+ *
+ * Implements the i2c_write_bytes action in the JSON config file.
+ */
+class I2CWriteBytesAction : public I2CAction
+{
+ public:
+ // Specify which compiler-generated methods we want
+ I2CWriteBytesAction() = delete;
+ I2CWriteBytesAction(const I2CWriteBytesAction&) = delete;
+ I2CWriteBytesAction(I2CWriteBytesAction&&) = delete;
+ I2CWriteBytesAction& operator=(const I2CWriteBytesAction&) = delete;
+ I2CWriteBytesAction& operator=(I2CWriteBytesAction&&) = delete;
+ virtual ~I2CWriteBytesAction() = 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 values One or more byte values to write. The bytes must be
+ * specified in the order required by the device (e.g. in
+ * little-endian order).
+ */
+ explicit I2CWriteBytesAction(uint8_t reg,
+ const std::vector<uint8_t>& values) :
+ reg{reg},
+ values{values}, masks{}
+ {
+ // Values vector must not be empty
+ if (values.size() < 1)
+ {
+ throw std::invalid_argument{"Values vector is empty"};
+ }
+ }
+
+ /**
+ * 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 values One or more byte values to write. The bytes must be
+ * specified in the order required by the device (e.g. in
+ * little-endian order).
+ * @param masks One or more bit masks. The number of bit masks must match
+ * the number of byte values to write. Each mask specifies
+ * which bits to write within the corresponding byte value.
+ * Only the bits with a value of 1 in the mask will be written.
+ */
+ explicit I2CWriteBytesAction(uint8_t reg,
+ const std::vector<uint8_t>& values,
+ const std::vector<uint8_t>& masks) :
+ reg{reg},
+ values{values}, masks{masks}
+ {
+ // Values vector must not be empty
+ if (values.size() < 1)
+ {
+ throw std::invalid_argument{"Values vector is empty"};
+ }
+
+ // Masks vector must have same size as values vector
+ if (masks.size() != values.size())
+ {
+ throw std::invalid_argument{"Masks vector has invalid size"};
+ }
+ }
+
+ /**
+ * Executes this action.
+ *
+ * Writes bytes to a device register using the I2C interface.
+ *
+ * All of the bytes will be written in a single I2C operation.
+ *
+ * The device register, byte values, and bit masks (if any) were specified
+ * in the constructor.
+ *
+ * The device is obtained from the specified action environment.
+ *
+ * Throws an exception if an error occurs.
+ *
+ * @param environment action execution environment
+ * @return true
+ */
+ virtual bool execute(ActionEnvironment& environment) override;
+
+ /**
+ * Returns the device register address.
+ *
+ * @return register address
+ */
+ uint8_t getRegister() const
+ {
+ return reg;
+ }
+
+ /**
+ * Returns the byte values to write.
+ *
+ * @return values to write
+ */
+ const std::vector<uint8_t>& getValues() const
+ {
+ return values;
+ }
+
+ /**
+ * Returns the bit masks.
+ *
+ * Each mask specifies which bits to write within the corresponding byte
+ * value. Only the bits with a value of 1 in the mask will be written.
+ *
+ * @return bit masks
+ */
+ const std::vector<uint8_t>& getMasks() const
+ {
+ return masks;
+ }
+
+ /**
+ * 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{0x00};
+
+ /**
+ * Byte values to write.
+ */
+ const std::vector<uint8_t> values{};
+
+ /**
+ * Bit masks. Each mask specifies which bits to write within the
+ * corresponding byte value. Only the bits with a value of 1 in the mask
+ * will be written.
+ */
+ const std::vector<uint8_t> masks{};
+};
+
+} // namespace phosphor::power::regulators
diff --git a/phosphor-regulators/src/meson.build b/phosphor-regulators/src/meson.build
index b5bb9f4..556c65b 100644
--- a/phosphor-regulators/src/meson.build
+++ b/phosphor-regulators/src/meson.build
@@ -10,7 +10,8 @@
'actions/i2c_compare_bit_action.cpp',
'actions/i2c_compare_byte_action.cpp',
'actions/i2c_compare_bytes_action.cpp',
- 'actions/i2c_write_byte_action.cpp'
+ 'actions/i2c_write_byte_action.cpp',
+ 'actions/i2c_write_bytes_action.cpp'
]
phosphor_regulators_library = static_library(