diff -r 000000000000 -r 6474c204b198 dom/webidl/FMRadio.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/FMRadio.webidl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,98 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+interface FMRadio : EventTarget {
+  /* Indicates if the FM radio is enabled. */
+  readonly attribute boolean enabled;
+
+  /* Indicates if the antenna is plugged and available. */
+  readonly attribute boolean antennaAvailable;
+
+  /**
+   * Current frequency in MHz. The value will be null if the FM radio is
+   * disabled.
+   */
+  readonly attribute double? frequency;
+
+  /* The upper bound of frequency in MHz. */
+  readonly attribute double frequencyUpperBound;
+
+  /* The lower bound of frequency in MHz. */
+  readonly attribute double frequencyLowerBound;
+
+  /**
+   * The difference in frequency between two "adjacent" channels, in MHz. That
+   * is, any two radio channels' frequencies differ by at least channelWidth
+   * MHz. Usually, the value is one of:
+   *  - 0.05 MHz
+   *  - 0.1  MHz
+   *  - 0.2  MHz
+   */
+  readonly attribute double channelWidth;
+
+  /* Fired when the FM radio is enabled. */
+  attribute EventHandler onenabled;
+
+  /* Fired when the FM radio is disabled. */
+  attribute EventHandler ondisabled;
+
+  /**
+   * Fired when the antenna becomes available or unavailable, i.e., fired when
+   * the antennaAvailable attribute changes.
+   */
+  attribute EventHandler onantennaavailablechange;
+
+  /* Fired when the FM radio's frequency is changed. */
+  attribute EventHandler onfrequencychange;
+
+  /**
+   * Power the FM radio off. The disabled event will be fired if this request
+   * completes successfully.
+   */
+  DOMRequest disable();
+
+  /**
+   * Power the FM radio on, and tune the radio to the given frequency in MHz.
+   * This will fail if the given frequency is out of range. The enabled event
+   * and frequencychange event will be fired if this request completes
+   * successfully.
+   */
+  DOMRequest enable(double frequency);
+
+  /**
+   * Tune the FM radio to the given frequency. This will fail if the given
+   * frequency is out of range.
+   *
+   * Note that the FM radio may not tuned to the exact frequency given. To get
+   * the frequency the radio is actually tuned to, wait for the request to fire
+   * sucess (or wait for the frequencychange event to fire), and then read the
+   * frequency attribute.
+   */
+  DOMRequest setFrequency(double frequency);
+
+  /**
+   * Tell the FM radio to seek up to the next channel. If the frequency is
+   * successfully changed, the frequencychange event will be triggered.
+   *
+   * Only one seek is allowed at once: If the radio is seeking when the seekUp
+   * is called, error will be fired.
+   */
+  DOMRequest seekUp();
+
+  /**
+   * Tell the FM radio to seek down to the next channel. If the frequency is
+   * successfully changed, the frequencychange event will be triggered.
+   *
+   * Only one seek is allowed at once: If the radio is seeking when the
+   * seekDown is called, error will be fired.
+   */
+  DOMRequest seekDown();
+
+  /**
+   * Cancel the seek action. If the radio is not currently seeking up or down,
+   * error will be fired.
+   */
+  DOMRequest cancelSeek();
+};
+