platform_hardware_interfaces/vibrator/1.0/IVibrator.hal

/*
 * Copyright (C) 2016 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.vibrator@1.0;

interface IVibrator {
  /**
   * Turn on vibrator
   *
   * This function must only be called after the previous timeout has expired or
   * was canceled (through off()).
   * @param timeout_ms number of milliseconds to vibrate.
   * @return vibratorOnRet whether vibrator command was successful or not.
   */
  on(uint32_t timeoutMs) generates (Status vibratorOnRet);

  /**
   * Turn off vibrator
   *
   * Cancel a previously-started vibration, if any.
   * @return vibratorOffRet whether vibrator command was successful or not.
   */
  off() generates (Status vibratorOffRet);

  /**
   * Returns whether the vibrator supports changes to its vibrational amplitude.
   */
  supportsAmplitudeControl() generates (bool supports);

  /**
   * Sets the motor's vibrational amplitude.
   *
   * Changes the force being produced by the underlying motor.
   *
   * @param amplitude The unitless force setting. Note that this number must
   *                  be between 1 and 255, inclusive. If the motor does not
   *                  have exactly 255 steps, it must do it's best to map it
   *                  onto the number of steps it does have.
   * @return status Whether the command was successful or not. Must return
   *                Status::UNSUPPORTED_OPERATION if setting the amplitude is
   *                not supported by the device.
   */
  setAmplitude(uint8_t amplitude) generates (Status status);

  /**
   * Fire off a predefined haptic event.
   *
   * @param event The type of haptic event to trigger.
   * @return status Whether the effect was successfully performed or not. Must
   *                return Status::UNSUPPORTED_OPERATION is the effect is not
   *                supported.
   * @return lengthMs The length of time the event is expected to take in
   *                  milliseconds. This doesn't need to be perfectly accurate,
   *                  but should be a reasonable approximation. Should be a
   *                  positive, non-zero value if the returned status is
   *                  Status::OK, and set to 0 otherwise.
   */
  perform(Effect effect, EffectStrength strength) generates (Status status, uint32_t lengthMs);
};