Define broadcast radio HAL 2.0.
The new HAL is a cleanup of 1.x branch of the legacy burden:
* structure flattened (multi-level factory removed);
* only one hardware tuner per HAL instance, only one session;
* front-end app doesn't control region settings anymore;
* metadata limited to int and string values;
* removed deprecated methods;
* result codes redefined.
It also fixes minor mistakes made with HAL 1.1:
* ProgramSelector simplified;
* there is no need to control background scan.
There are three features missing compared to the HAL 1.1, as they
are in development with the new design (see design docs attached):
* Announcements - b/68045105
* Program list - b/69860743
* Region handling - b/69958423
Test: VTS
Bug: b/69958777
Change-Id: I0ad83f25630c1250d73dc3941144d345339fbde0
diff --git a/broadcastradio/2.0/ITunerSession.hal b/broadcastradio/2.0/ITunerSession.hal
new file mode 100644
index 0000000..ae6cbb5
--- /dev/null
+++ b/broadcastradio/2.0/ITunerSession.hal
@@ -0,0 +1,137 @@
+/* Copyright (C) 2017 The Android Open Source Project
+ *
+ * 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.
+ */
+
+package android.hardware.broadcastradio@2.0;
+
+interface ITunerSession {
+ /**
+ * Tune to a specified program.
+ *
+ * Automatically cancels pending scan, step or tune.
+ * If the method returns OK, tuneFailed or currentProgramInfoChanged
+ * callback must be called.
+ *
+ * @param program Program to tune to.
+ * @return result OK if successfully started tuning.
+ * NOT_SUPPORTED if the program selector doesn't contain any
+ * supported identifier.
+ * INVALID_ARGUMENTS if the program selector contains
+ * identifiers in invalid format (i.e. out of range).
+ */
+ tune(ProgramSelector program) generates (Result result);
+
+ /**
+ * Tune to the next valid program.
+ *
+ * Automatically cancels pending scan, step or tune.
+ * If the method returns OK, tuneFailed or currentProgramInfoChanged
+ * callback must be called.
+ *
+ * The skipSubChannel parameter is used to skip digital radio subchannels:
+ * - HD Radio SPS;
+ * - DAB secondary service.
+ *
+ * As an implementation detail, the HAL has the option to perform an actual
+ * scan or select the next program from the list retrieved in the
+ * background, if one is not stale.
+ *
+ * @param directionUp True to change towards higher numeric values
+ * (frequency, channel number), false towards lower.
+ * @param skipSubChannel Don't tune to subchannels.
+ * @return result OK if the scan has successfully started.
+ */
+ scan(bool directionUp, bool skipSubChannel) generates (Result result);
+
+ /**
+ * Tune to the adjacent channel, which may not be occupied by any program.
+ *
+ * Automatically cancels pending scan, step or tune.
+ * If the method returns OK, tuneFailed or currentProgramInfoChanged
+ * callback must be called.
+ *
+ * @param directionUp True to change towards higher numeric values
+ * (frequency, channel number), false towards lower.
+ * @return result OK successfully started tuning.
+ * NOT_SUPPORTED if tuning to an unoccupied channel is not
+ * supported (i.e. for satellite radio).
+ */
+ step(bool directionUp) generates (Result result);
+
+ /**
+ * Cancel a scan, step or tune operation.
+ *
+ * If there is no such operation running, the call must be ignored.
+ */
+ cancel();
+
+ /**
+ * Generic method for setting vendor-specific parameter values.
+ * The framework does not interpret the parameters, they are passed
+ * in an opaque manner between a vendor application and HAL.
+ *
+ * Framework does not make any assumptions on the keys or values, other than
+ * ones stated in VendorKeyValue documentation (a requirement of key
+ * prefixes).
+ *
+ * For each pair in the result vector, the key must be one of the keys
+ * contained in the input (possibly with wildcards expanded), and the value
+ * must be a vendor-specific result status (i.e. the string "OK" or an error
+ * code). The implementation may choose to return an empty vector, or only
+ * return a status for a subset of the provided inputs, at its discretion.
+ *
+ * Application and HAL must not use keys with unknown prefix. In particular,
+ * it must not place a key-value pair in results vector for unknown key from
+ * parameters vector - instead, an unknown key should simply be ignored.
+ * In other words, results vector may contain a subset of parameter keys
+ * (however, the framework doesn't enforce a strict subset - the only
+ * formal requirement is vendor domain prefix for keys).
+ *
+ * @param parameters Vendor-specific key-value pairs.
+ * @return results Operation completion status for parameters being set.
+ */
+ setParameters(vec<VendorKeyValue> parameters)
+ generates (vec<VendorKeyValue> results);
+
+ /**
+ * Generic method for retrieving vendor-specific parameter values.
+ * The framework does not interpret the parameters, they are passed
+ * in an opaque manner between a vendor application and HAL.
+ *
+ * Framework does not cache set/get requests, so it's allowed for
+ * getParameter to return a different value than previous setParameter call.
+ *
+ * The syntax and semantics of keys are up to the vendor (as long as prefix
+ * rules are obeyed). For instance, vendors may include some form of
+ * wildcard support. In such case, result vector may be of different size
+ * than requested keys vector. However, wildcards are not recognized by
+ * framework and they are passed as-is to the HAL implementation.
+ *
+ * Unknown keys must be ignored and not placed into results vector.
+ *
+ * @param keys Parameter keys to fetch.
+ * @return parameters Vendor-specific key-value pairs.
+ */
+ getParameters(vec<string> keys) generates (vec<VendorKeyValue> parameters);
+
+ /**
+ * Closes the session.
+ *
+ * The call must not fail and must only be issued once.
+ *
+ * After the close call is executed, no other calls to this interface
+ * are allowed.
+ */
+ close();
+};