doc: Adding documetation for intel LTE coex

Added intel-lte-coex-api.txt which defines LTE coexistence
interface for intel modems.

doc/intel-lte-coex-api.txt

@@ -0,0 +1,137 @@
+LTE Coexistence hierarchy
+=========================
+
+Service		org.ofono
+Interface	org.ofono.intel.LteCoexistence
+Object path	[variable prefix]/{modem0,modem1,...}
+
+Methods		dict GetProperties()
+
+			Returns all coexistence configuration properties.
+
+		void SetProperty(string property, variant value)
+
+			Changes the value of the specified property. Only
+			properties that are listed as Read-write are changeable.
+			On success a PropertyChanged signal will be emitted.
+
+			Possible Errors: [service].Error.InProgress
+						[service].Error.InvalidArguments
+						[service].Error.Failed
+
+		void RegisterAgent(object path)
+
+			Registers an agent which will be called whenever the
+			modem initiates LTE Coexistence information.
+
+			Possible Errors: [service].Error.InProgress
+					 [service].Error.InvalidArguments
+					 [service].Error.InvalidFormat
+					 [service].Error.Failed
+
+		void UnregisterAgent(object path)
+
+			Unregisters an agent.
+
+			Possible Errors: [service].Error.InvalidArguments
+					 [service].Error.Failed
+
+		a(a{sv}) GetPlmnHistory()
+			Requests for LTE Plmn history list stored in NVM to
+			retrieve geo location history like MobileNetworkCode,
+			MobileCountryCode, LteBandsFDD, LteBandsTDD,
+			ChannelBandwidth.
+
+			Refer to the sections below for which property types
+			are available, their valid value ranges and
+			applicability to different cell types.
+
+Signals		PropertyChanged(string property, variant value)
+
+			This signal indicates a changed value of the given
+			property.
+
+Properties	string Band [readwrite]
+
+			Frequency band in which the modem is operating when
+			using "lte" mode.
+
+		boolean BTActive [readwrite]
+
+			Contains whether BT Coex is activated or not.
+
+		boolean WLANActive [readwrite]
+
+			Contains whether WLAN Coex is activated or not.
+
+		string WLANBandwidth [readwrite]
+
+			Contains the frequency WLAN Coex is activated on, when
+			"CoexWLANActive" is active.
+
+			The possible values are:
+			- "20MHz"
+			- "40MHz"
+			- "80MHz"
+
+LTECoexistenceAgent Hierarchy [experimental]
+=============================
+
+Service		unique name
+Interface	org.ofono.intel.LteCoexistenceAgent
+Object path	freely definable
+
+Methods		void ReceiveBluetoothNotification(array{byte} notification,
+							dict info) [noreply]
+
+			Requests the agent to process Bluetooth related LTE
+			Coexistence information. The dictionary info contains
+			vector table with modem recommended Safe Tx/Rx band and
+			range information.The properties involved are
+			'SafeTxMin', 'SafeRxMin', 'SafeTxMax', 'SafeRxMax' and
+			'SafeVector'.
+
+			Possible Errors: None
+
+		void ReceiveWiFiNotification(array{byte} notification,
+							dict info) [noreply]
+
+			Requests the agent to process WiFi related LTE
+			Coexistence information. The dictionary info contains
+			vector table with modem recommended SafeTx/Rx band and
+			range information. The properties involved are
+			'SafeTxMin', 'SafeRxMin', 'SafeTxMax', 'SafeRxMax' and
+			'SafeVector'.
+
+			Possible Errors: None
+
+		void Release() [noreply]
+
+			Agent is being released, possibly because of oFono
+			terminating, Coex interface is being torn down or modem
+			off. No UnregisterAgent call is needed.
+
+LTE Plmn history params
+=======================
+uint16 MobileNetworkCode [readonly, optional]
+
+	Contains the MNC of the cell.
+
+uint16 MobileCountryCode [readonly, optional]
+
+	Contains the MCC of the cell.
+
+uint32 LteBandsFDD [readonly, optional]
+
+	Contains the Lte FDD band. Valid range of values is 1 to 32 as per
+	3GPP 36.101 Section 5.5.
+
+uint32 LteBandsTDD [readonly, optional]
+
+	Contains the Lte TDD band. Valid range of values is 33 to 64 as per
+	3GPP 36.101 Section 5.5.
+
+byte ChannelBandwidth [readonly, optional]
+
+	Contains the Channel bandwidth. Valid range of values is 0 to 6 as per
+	3GPP 36.101 Section 5.6.