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libratbag/doc/dbus.rst
Peter Hutterer b4009669b9 ratbagd: Add an APIVersion property to make version checks easier 
While the DBus API is still in flux, things can break at any time.

Keeping piper and libratbag in version-step works terribly, doubly so where
piper is flatpaked but ratbagd comes from some repo somewhere. We can't check
at build-time, we can't run ratbagd --version at runtime.

so let's add a version field for now and drop it if we ever get to stable.
Meanwhile, ratbagd.py will throw an exception if the expected version doesn't
match exactly.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
2019-07-31 09:08:06 +10:00

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********
DBus API
********
Note: **the DBus interface is subject to change**
Interfaces:
* :ref:`manager`
* :ref:`device`
* :ref:`profile`
* :ref:`resolution`
* :ref:`button`
* :ref:`led`
Changing settings on a device is a three-step process:
#. Change the various properties to the desired value
#. Invoke :func:`org.freedesktop.ratbag1.Device.Commit() <Commit>`
#. Optional: if an error occured writing the new data to the device,
a :func:`org.freedesktop.ratbag1.Resync <Resync>` signal is emitted on the device and
all properties are updated accordingly.
The time it takes to write settings to a device varies greatly, any caller
must be prepared to receive a :func:`org.freedesktop.ratbag1.Device.Resync
<Resync>` signal several seconds after
:func:`org.freedesktop.ratbag1.Device.Commit() <Commit>`.
Notes on the DBus API
---------------------
For easier debugging, objects paths are constructed from the device. e.g.
``/org/freedesktop/ratbag/button/event5/p0/b10`` is the button interface for
button 10 on profile 0 on event5. The naming is subject to change. Do not
rely on a constructed object path in your application.
Types
.....
Types used by these interfaces:
+----------+-----------------------------------+
| Type | Description |
+==========+===================================+
| ``b`` | Bool |
+----------+-----------------------------------+
| ``o`` | Object path |
+----------+-----------------------------------+
| ``s`` | String |
+----------+-----------------------------------+
| ``u`` | Unsigned 32-bit integer |
+----------+-----------------------------------+
|``(uuu)`` | A triplet of 32-bit integers |
+----------+-----------------------------------+
| ``ao`` | Array of object paths |
+----------+-----------------------------------+
| ``as`` | Array of strings |
+----------+-----------------------------------+
| ``au`` | Array of 32-bit integers |
+----------+-----------------------------------+
| ``a(uu)``| Array of 2 32-bit integer tuples |
+----------+-----------------------------------+
For details on each type, see the `DBus Specification
<https://dbus.freedesktop.org/doc/dbus-specification.html>`_.
Flags
.....
Properties marked as **constant** do not change for the lifetime of the
object. Properties marked as **mutable** may change, and a
``org.freedesktop.DBus.Properties.PropertyChanged`` signal is sent for those
unless otherwise specified.
.. _manager:
org.freedesktop.ratbag1.Manager
-------------------------------
The **org.freedesktop.ratbag1.Manager** interface is the entry point to
interact with ratbagd.
.. attribute:: APIVersion
:type: i
:flags: read-only,constant
The DBus API version. This is a stopgap feature while the DBus API
is still in flux. The version has no backwards or
forward-compatibilty guarantees - your client must understand
**exactly** the same version, it is not enough to support an older
or a newer version.
This API will be removed once the DBus API is declared stable.
.. attribute:: Devices
:type: ao
:flags: read-only, mutable
An array of read-only object paths referencing the available
devices. The devices implement the :ref:`device` interface.
.. _device:
org.freedesktop.ratbag1.Device
-------------------------------
The **org.freedesktop.ratbag1.Device** interface describes a single device
known to ratbagd.
.. attribute:: Model
:type: s
:flags: read-only, constant
An ID identifying the physical device model. This string is
guaranteed to be unique for a specific model and always identical
for devices of that model.
This is a string of one of the following formats:
- ``usb:1234:abcd:0``
- ``bluetooth:5678:ef01:0``
- ``unknown``
In the future, other formats may get added. Clients must ignore
unknown string formats.
For a string starting with ``usb:``, the format is the bus type (USB)
followed by a 4-digit lowercase hex USB vendor ID, followed by a
4-digit lowercase hex USB product ID, followed by an decimal version
number of unspecified length. These four elements are separated by a
colon (``:``).
For a string starting with ``bluetooth:``, the format is the bus type
(Bluetooth) followed by a 4-digit lowercase hex Bluetooth vendor ID,
followed by a 4-digit lowercase hex Bluetooth product ID, followed
by an decimal version number of unspecified length. These four
elements are separated by a colon (``:``).
For the string ``unknown``, the model of the device cannot be
determined. This is usually a bug in libratbag.
For a ``Model`` of type ``usb`` and ``bluetooth``, the version
number is reserved for use by libratbag. Device with identical
vendor and product IDs but different versions must be considered
different devices. For example, the version may increase when a
manufacturer re-uses USB Ids.
Vendor or product IDs of 0 are valid IDs (e.g. used used by test
devices).
.. attribute:: Name
:type: s
:flags: read-only, constant
The device's name, suitable for presentation to the user.
.. attribute:: Profiles
:type: ao
:flags: read-only, mutable
This property is mutable if the device supports adding and removing
profiles.
Provides the list of profile paths for all profiles on this device, see
:ref:`profile`
.. function:: Commit() → ()
Commits the changes to the device. This call always succeeds,
the data is written to the device asynchronously. Where an error
occurs, the :func:`Resync` signal is emitted and all properties are
updated to the current state.
.. function:: Resync()
:type: Signal
Emitted when an internal error occurs, usually on writing values to
the device after :func:`Commit()`. Upon receiving this
signal, clients are expected to resync their property values with
ratbagd.
.. _profile:
org.freedesktop.ratbag1.Profile
-------------------------------
.. attribute:: Index
:type: u
:flags: read-only, constant
The zero-based index of this profile
.. attribute:: Name
:type: s
:flags: read-write, mutable
The name of this profile. If the name is the empty string, the
profile name cannot be changed.
.. attribute:: Enabled
:type: b
:flags: read-write, mutable
True if this is the profile is enabled, false otherwise.
Note that a disabled profile might not have correct bindings, so it's
a good thing to rebind everything before calling
:func:`Commit`.
.. attribute:: IsActive
:type: b
:flags: read-only, mutable
True if this is the currently active profile, false otherwise.
Profiles can only be set to active, but never to not active - at least one
profile must be active at all times. This property is read-only, use the
:func:`SetActive` method to activate a profile.
.. attribute:: Resolutions
:type: ao
:flags: read-only, mutable
This property is mutable if the device supports adding and removing
resolutions.
Provides the object paths of all resolutions in this profile, see
:ref:`resolution`.
.. attribute:: Buttons
:type: ao
:flags: read-only, constant
Provides the object paths of all buttons in this profile, see
:ref:`button`.
.. attribute:: Leds
:type: ao
:flags: read-only, constant
Provides the object paths of all LEDs in this profile, see
:ref:`led`.
.. attribute:: ReportRate
:type: u
:flags: read-write, mutable
uint for the report rate in Hz assigned to this profile. This rate
must be one of those listed in :attr:`ReportRates`.
.. attribute:: ReportRates
:type: au
:flags: read-write, constant
A list of permitted report rates. Values in this list may be used
in the :attr:`ReportRate` property. This list is always sorted
ascending, the lowest report rate is the first item in the list.
This list may be empty if the device does not support reading and/or
writing to resolutions.
.. function:: SetActive() → ()
Set this profile to be the active profile
.. _resolution:
org.freedesktop.ratbag1.Resolution
----------------------------------
.. attribute:: Index
:type: u
:flags: read-only, constant
Index of the resolution
.. attribute:: IsActive
:type: b
:flags: read-only, mutable
True if this is the currently active resolution, false otherwise.
Resolutions can only be set to active, but never to not
active - at least one resoultion must be active at all
times. This property is read-only, use the
:func:`SetActive` method to set a resolution as the
active resolution.
.. attribute:: IsDefault
:type: b
:flags: read-only, mutable
True if this is the currently default resolution, false
otherwise. If the device does not have the default
resolution capability, this property is always false.
Resolutions can only be set to default, but never to not
default - at least one resolution must be default at all
times. This property is read-only, use the
:func:`SetDefault` method to set a resolution as
the default resolution.
.. attribute:: Resolution
:type: v
:flags: read-write, mutable
The resolution for this entry in dpi.
If the variant is a single unsigned integer (``u``), the value is
the resolution for both the x- and the y- axis.
If the variant is a unsigned integer tuple (``(uu)``), the value is
the resolution for the x- and y- axis separately.
A client must leave the type intact, assigning a single ``u`` to a
resolution object previously exporting ``(uu)`` is invalid.
The value for the resolution must be equal to one of the values in
:attr:`Resolutions`.
.. attribute:: Resolutions
:type: au
:flags: read-only, constant
A list of permitted resolutions. Values in this list may be used in
the :attr:`Resolution` property. This list is always sorted
ascending, the lowest resolution is the first item in the list.
This list may be empty if the device does not support reading and/or
writing to resolutions.
.. function:: SetDefault() → ()
Set this resolution to be the default
.. function:: SetActive() → ()
Set this resolution to be the active one
.. _button:
org.freedesktop.ratbag1.Button
------------------------------
.. attribute:: Index
:type: u
:flags: read-only, constant
Index of the button
.. attribute:: Mapping
:type: (uv)
:flags: read-write, mutable
The current button mapping. The first element is the ``ActionType``
for this button and must be one of those in :attr:`ActionTypes`.
If the ActionType is *Button*, the variant is an unsigned integer
(``u``) denoting the button number to map to.
If the ActionType is *Special*, the variant is an unsigned integer
(``u``) denoting the special value to map to.
If the ActionType is *Macro*, the variant is an array of integer
tuples (``a(uu)``) where each tuple is ``(type, keycode)`` and the
type is one of the following:
+---------+--------------------------------------+
| Value | Description |
+=========+======================================+
| 0 | Key release event |
+---------+--------------------------------------+
| 1 | Key press event |
+---------+--------------------------------------+
If the ActionType is *Unknown*, the variant is an unsigned integer
(``u``) of value 0.
.. attribute:: ActionTypes
:type: au
:flags: read-only, constant
+---------+---------+--------------------------------------+
| Value | Name | Description |
+=========+=========+======================================+
| 0 | None | No mapping configured |
+---------+---------+--------------------------------------+
| 1 | Button | Mapping to a logical button number |
+---------+---------+--------------------------------------+
| 2 | Special | Mapping to a special function |
+---------+---------+--------------------------------------+
| 3 | Macro | Mapping to a macro key sequence |
+---------+---------+--------------------------------------+
| 1000 | Unknown | An unknown or unreadable mapping type|
+---------+---------+--------------------------------------+
See :ref:`button_special` for a list of supported special
functions.
Clients must ignore :attr:`ActionTypes` unknown to them.
.. function:: Disable() → ()
Disable this button
.. _led:
org.freedesktop.ratbag1.Led
---------------------------
.. attribute:: Index
:type: u
:flags: read-only, constant
Index of the LED
.. attribute:: Mode
:type: u
:flags: read-write, mutable
Enum describing the current mode, see :attr:`Modes`.
.. attribute:: Modes
:type: au
:flags: read-only, constant
A list of modes supported by this LED.
+-------+-------------------------------------+
| Value | Definition |
+=======+=====================================+
| 0 | LED is off |
+-------+-------------------------------------+
| 1 | LED is on with constant brightness |
+-------+-------------------------------------+
| 2 | LED cycles through a set of colors. |
| | This mode ignores the :attr:`Color` |
| | values. |
+-------+-------------------------------------+
| 3 | LED uses a breathing-style animation|
+-------+-------------------------------------+
In the future, extra values may get added. Clients must ignore
unknown Modes.
.. attribute:: Color
:type: (uuu)
:flags: read-write, mutable
32-bit unsigned int triplet (RGB) of the LED's color. Only the least
significant bits are valid, the :attr:`ColorDepth` property defines
the number of bits for each color. When writing to this property,
all bits outside the color depth must be 0.
.. attribute:: ColorDepth
:type: u
:flags: read-only, constant
An enum specifying the color depth of this LED. Permitted values are:
+-------+-------------------------------+
| Value | Definition |
+=======+===============================+
| 0 | 0 bits per color (monochrome) |
+-------+-------------------------------+
| 1 | 8 bits per color |
+-------+-------------------------------+
| 2 | 1 bit per color |
+-------+-------------------------------+
In the future, extra values may get added. Clients must ignore
unknown ``ColorDepths`` and not manipulate the LED color where
the ``ColorDepth`` is unknown.
.. attribute:: EffectDuration
:type: u
:flags: read-write, mutable
The effect duration in ms, possible values are in the range 0 - 10000
.. attribute:: Brightness
:type: u
:flags: read-write, mutable
The brightness of the LED, normalized to the range 0-255, inclusive.
Where the LED supports less than 8-bit of brightness, libratbag maps
the value to a device-supported value in an implementation-defined
manner.
.. _button_special:
Special button functions
------------------------
All special button function values are based on the value
``0x40000000`` (``1 << 30``).
+------------+------------+---------------------------------------------------+
| Offset | Value |Description |
+============+============+===================================================+
| 0 | 0x40000000 | Unknown |
+------------+------------+---------------------------------------------------+
| 1 | 0x40000001 | Doublelick |
+------------+------------+---------------------------------------------------+
| 2 | 0x40000002 | Wheel left |
+------------+------------+---------------------------------------------------+
| 3 | 0x40000003 | Wheel right |
+------------+------------+---------------------------------------------------+
| 4 | 0x40000004 | Wheel up |
+------------+------------+---------------------------------------------------+
| 5 | 0x40000005 | Wheel down |
+------------+------------+---------------------------------------------------+
| 6 | 0x40000006 | Ratchet mode switch |
+------------+------------+---------------------------------------------------+
| 7 | 0x40000007 | Resolution cycle up |
+------------+------------+---------------------------------------------------+
| 8 | 0x40000008 | Resolution cycle down |
+------------+------------+---------------------------------------------------+
| 9 | 0x40000009 | Resolution up |
+------------+------------+---------------------------------------------------+
| 10 | 0x4000000a | Resolution down |
+------------+------------+---------------------------------------------------+
| 11 | 0x4000000b | Resolution alternate |
+------------+------------+---------------------------------------------------+
| 12 | 0x4000000c | Resolution default |
+------------+------------+---------------------------------------------------+
| 13 | 0x4000000d | Profile cycle up |
+------------+------------+---------------------------------------------------+
| 14 | 0x4000000e | Profile cycle down |
+------------+------------+---------------------------------------------------+
| 15 | 0x4000000f | Profile up |
+------------+------------+---------------------------------------------------+
| 16 | 0x40000010 | Profile down |
+------------+------------+---------------------------------------------------+
| 17 | 0x40000011 | Second mode |
+------------+------------+---------------------------------------------------+
| 18 | 0x40000012 | Battery level |
+------------+------------+---------------------------------------------------+
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