Add Generic button dbus interface

The button interface is a generic dbus interface which can be used
in the front panel phosphor-buttons dbus objects that has button type
physical form factor(Pressed/Released).

This dbus interface will be initially used by ocp debug card host selector
button interface as it has a button form factor type.

Design : https://github.com/openbmc/docs/blob/master/designs/multihost-phosphor-buttons.md

Signed-off-by: Naveen Moses <naveen.mosess@hcl.com>
Change-Id: I10e940c93ce549489fd23ff76a3be9e09ae1ae9c
diff --git a/gen/xyz/openbmc_project/Chassis/Buttons/Button/meson.build b/gen/xyz/openbmc_project/Chassis/Buttons/Button/meson.build
new file mode 100644
index 0000000..dfe5489
--- /dev/null
+++ b/gen/xyz/openbmc_project/Chassis/Buttons/Button/meson.build
@@ -0,0 +1,14 @@
+# Generated file; do not modify.
+generated_sources += custom_target(
+    'xyz/openbmc_project/Chassis/Buttons/Button__cpp'.underscorify(),
+    input: [ '../../../../../../yaml/xyz/openbmc_project/Chassis/Buttons/Button.interface.yaml',  ],
+    output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
+    command: [
+        sdbuspp_gen_meson_prog, '--command', 'cpp',
+        '--output', meson.current_build_dir(),
+        '--tool', sdbusplusplus_prog,
+        '--directory', meson.current_source_dir() / '../../../../../../yaml',
+        'xyz/openbmc_project/Chassis/Buttons/Button',
+    ],
+)
+
diff --git a/gen/xyz/openbmc_project/Chassis/Buttons/meson.build b/gen/xyz/openbmc_project/Chassis/Buttons/meson.build
index 994214a..0de2bfb 100644
--- a/gen/xyz/openbmc_project/Chassis/Buttons/meson.build
+++ b/gen/xyz/openbmc_project/Chassis/Buttons/meson.build
@@ -1,4 +1,18 @@
 # Generated file; do not modify.
+subdir('Button')
+generated_others += custom_target(
+    'xyz/openbmc_project/Chassis/Buttons/Button__markdown'.underscorify(),
+    input: [ '../../../../../yaml/xyz/openbmc_project/Chassis/Buttons/Button.interface.yaml',  ],
+    output: [ 'Button.md' ],
+    command: [
+        sdbuspp_gen_meson_prog, '--command', 'markdown',
+        '--output', meson.current_build_dir(),
+        '--tool', sdbusplusplus_prog,
+        '--directory', meson.current_source_dir() / '../../../../../yaml',
+        'xyz/openbmc_project/Chassis/Buttons/Button',
+    ],
+)
+
 subdir('HostSelector')
 generated_others += custom_target(
     'xyz/openbmc_project/Chassis/Buttons/HostSelector__markdown'.underscorify(),
diff --git a/yaml/xyz/openbmc_project/Chassis/Buttons/Button.interface.yaml b/yaml/xyz/openbmc_project/Chassis/Buttons/Button.interface.yaml
new file mode 100644
index 0000000..4acaf70
--- /dev/null
+++ b/yaml/xyz/openbmc_project/Chassis/Buttons/Button.interface.yaml
@@ -0,0 +1,47 @@
+description: >
+    Button interface is a generic phosphor button interface  which supports
+    two primary actions (pressed/releasd). When the button is pressed
+    "Pressed" signal is emitted and when button is released then "Released"
+      signal is emitted.
+methods:
+  - name: simPress
+    description: >
+      Emulate button press.
+    errors:
+      - xyz.openbmc_project.Chassis.Common.Error.UnsupportedCommand
+      - xyz.openbmc_project.Chassis.Common.Error.IOError
+  - name: simRelease
+    description: >
+      Emulate button release.
+    errors:
+      - xyz.openbmc_project.Chassis.Common.Error.UnsupportedCommand
+      - xyz.openbmc_project.Chassis.Common.Error.IOError
+  - name: simLongPress
+    description: >
+      Emulate long button press.
+    errors:
+      - xyz.openbmc_project.Chassis.Common.Error.UnsupportedCommand
+      - xyz.openbmc_project.Chassis.Common.Error.IOError
+
+properties:
+    - name: Enabled
+      type: boolean
+      default: true
+      description: >
+          Enable/disable the button object.
+          false means button is disabled
+          true means button is enabled
+      errors:
+          - xyz.openbmc_project.Chassis.Common.Error.UnsupportedCommand
+          - xyz.openbmc_project.Chassis.Common.Error.IOError
+
+signals:
+    - name: Released
+      description: >
+        Button released signal
+    - name: Pressed
+      description: >
+        Button pressed signal
+    - name: PressedLong
+      description: >
+        Button long pressed signal