[libgpiod][PATCH v3 09/14] bindings: cxx: add support for SET_CONFIG

[Kent Gibson <warthog618@xxxxxxxxx>]

Add methods to support setting line configuration.

Signed-off-by: Kent Gibson <warthog618@xxxxxxxxx>
---
 bindings/cxx/gpiod.hpp     | 55 +++++++++++++++++++++++++
 bindings/cxx/line.cpp      | 37 +++++++++++++++++
 bindings/cxx/line_bulk.cpp | 83 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 175 insertions(+)

diff --git a/bindings/cxx/gpiod.hpp b/bindings/cxx/gpiod.hpp
index 2b1a6ab..dcae431 100644
--- a/bindings/cxx/gpiod.hpp
+++ b/bindings/cxx/gpiod.hpp
@@ -381,6 +381,32 @@ public:
 	 */
 	GPIOD_API void set_value(int val) const;
 
+	/**
+	 * @brief Set configuration of this line.
+	 * @param direction New direction.
+	 * @param flags Replacement flags.
+	 * @param value New value (0 or 1) - only matters for OUTPUT direction.
+	 */
+	GPIOD_API void set_config(int direction, ::std::bitset<32> flags,
+			int value = 0) const;
+
+	/**
+	 * @brief Set configuration flags of this line.
+	 * @param flags Replacement flags.
+	 */
+	GPIOD_API void set_flags(::std::bitset<32> flags) const;
+
+	/**
+	 * @brief Change the direction this line to input.
+	 */
+	GPIOD_API void set_direction_input() const;
+
+	/**
+	 * @brief Change the direction this lines to output.
+	 * @param value New value (0 or 1).
+	 */
+	GPIOD_API void set_direction_output(int value = 0) const;
+
 	/**
 	 * @brief Wait for an event on this line.
 	 * @param timeout Time to wait before returning if no event occurred.
@@ -648,6 +674,35 @@ public:
 	 */
 	GPIOD_API void set_values(const ::std::vector<int>& values) const;
 
+	/**
+	 * @brief Set configuration of all lines held by this object.
+	 * @param direction New direction.
+	 * @param flags Replacement flags.
+	 * @param values Vector of values to set. Must be the same size as the
+	 *        number of lines held by this line_bulk.
+	 * 	  Only relevant for output direction requests.
+	 */
+	GPIOD_API void set_config(int direction, ::std::bitset<32> flags,
+			const ::std::vector<int> values = std::vector<int>()) const;
+
+	/**
+	 * @brief Set configuration flags of all lines held by this object.
+	 * @param flags Replacement flags.
+	 */
+	GPIOD_API void set_flags(::std::bitset<32> flags) const;
+
+	/**
+	 * @brief Change the direction all lines held by this object to input.
+	 */
+	GPIOD_API void set_direction_input() const;
+
+	/**
+	 * @brief Change the direction all lines held by this object to output.
+	 * @param values Vector of values to set. Must be the same size as the
+	 *        number of lines held by this line_bulk.
+	 */
+	GPIOD_API void set_direction_output(const ::std::vector<int>& values) const;
+
 	/**
 	 * @brief Poll the set of lines for line events.
 	 * @param timeout Number of nanoseconds to wait before returning an
diff --git a/bindings/cxx/line.cpp b/bindings/cxx/line.cpp
index dd6bb6a..a688b5d 100644
--- a/bindings/cxx/line.cpp
+++ b/bindings/cxx/line.cpp
@@ -158,6 +158,43 @@ void line::set_value(int val) const
 	bulk.set_values({ val });
 }
 
+void line::set_config(int direction, ::std::bitset<32> flags,
+			int value) const
+{
+	this->throw_if_null();
+
+	line_bulk bulk({ *this });
+
+	bulk.set_config(direction, flags, { value });
+}
+
+void line::set_flags(::std::bitset<32> flags) const
+{
+	this->throw_if_null();
+
+	line_bulk bulk({ *this });
+
+	bulk.set_flags(flags);
+}
+
+void line::set_direction_input() const
+{
+	this->throw_if_null();
+
+	line_bulk bulk({ *this });
+
+	bulk.set_direction_input();
+}
+
+void line::set_direction_output(int value) const
+{
+	this->throw_if_null();
+
+	line_bulk bulk({ *this });
+
+	bulk.set_direction_output({ value });
+}
+
 bool line::event_wait(const ::std::chrono::nanoseconds& timeout) const
 {
 	this->throw_if_null();
diff --git a/bindings/cxx/line_bulk.cpp b/bindings/cxx/line_bulk.cpp
index 5f1cac4..b8f5eb7 100644
--- a/bindings/cxx/line_bulk.cpp
+++ b/bindings/cxx/line_bulk.cpp
@@ -176,6 +176,89 @@ void line_bulk::set_values(const ::std::vector<int>& values) const
 					  "error setting GPIO line values");
 }
 
+void line_bulk::set_config(int direction, ::std::bitset<32> flags,
+			   const ::std::vector<int> values) const
+{
+	this->throw_if_empty();
+
+	if (!values.empty() && this->_m_bulk.size() != values.size())
+		throw ::std::invalid_argument("the number of default values must correspond with the number of lines");
+
+	::gpiod_line_bulk bulk;
+	int rv, gflags;
+
+	gflags = 0;
+
+	for (auto& it: reqflag_mapping) {
+		if ((it.first & flags).to_ulong())
+			gflags |= it.second;
+	}
+
+	this->to_line_bulk(::std::addressof(bulk));
+
+	rv = ::gpiod_line_set_config_bulk(::std::addressof(bulk), direction,
+					  gflags, values.data());
+	if (rv)
+		throw ::std::system_error(errno, ::std::system_category(),
+					  "error setting GPIO line config");
+}
+
+void line_bulk::set_flags(::std::bitset<32> flags) const
+{
+	this->throw_if_empty();
+
+	::gpiod_line_bulk bulk;
+	int rv, gflags;
+
+	this->to_line_bulk(::std::addressof(bulk));
+
+	gflags = 0;
+
+	for (auto& it: reqflag_mapping) {
+		if ((it.first & flags).to_ulong())
+			gflags |= it.second;
+	}
+
+	rv = ::gpiod_line_set_flags_bulk(::std::addressof(bulk), gflags);
+	if (rv)
+		throw ::std::system_error(errno, ::std::system_category(),
+					  "error setting GPIO line flags");
+}
+
+void line_bulk::set_direction_input() const
+{
+	this->throw_if_empty();
+
+	::gpiod_line_bulk bulk;
+	int rv;
+
+	this->to_line_bulk(::std::addressof(bulk));
+
+	rv = ::gpiod_line_set_direction_input_bulk(::std::addressof(bulk));
+	if (rv)
+		throw ::std::system_error(errno, ::std::system_category(),
+			"error setting GPIO line direction to input");
+}
+
+void line_bulk::set_direction_output(const ::std::vector<int>& values) const
+{
+	this->throw_if_empty();
+
+	if (values.size() != this->_m_bulk.size())
+		throw ::std::invalid_argument("the size of values array must correspond with the number of lines");
+
+	::gpiod_line_bulk bulk;
+	int rv;
+
+	this->to_line_bulk(::std::addressof(bulk));
+
+	rv = ::gpiod_line_set_direction_output_bulk(::std::addressof(bulk),
+						    values.data());
+	if (rv)
+		throw ::std::system_error(errno, ::std::system_category(),
+			"error setting GPIO line direction to output");
+}
+
 line_bulk line_bulk::event_wait(const ::std::chrono::nanoseconds& timeout) const
 {
 	this->throw_if_empty();
-- 
2.24.0