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    ASoC: TPA6130A2 amplifier driver · 493b67ef
    Peter Ujfalusi 提交于
    Driver for Texas Instruments TPA6130A2 stereo headphone
    amplifier.
    
    The driver provides playback gain control and also pre-defined
    DAPM_HP widgets and DAPM routings for power management.
    
    The DAPM_HP widget names are:
    "TPA6130A2 Headphone Left"
    "TPA6130A2 Headphone Right"
    
    From soc machine drivers to use with the tpa6130a2 amplifier,
    the tpa6130a2_add_controls has to be called, which adds the alsa
    controls and the DAPM routing needed for the tpa6130a2.
    After that the machine driver can connect the codec's output
    with 'TPA6130A2 Left' and 'TPA6130A2 Right':
    
            {"TPA6130A2 Left", NULL, "CODEC LEFT OUT"},
            {"TPA6130A2 Right", NULL, "CODEC RIGHT OUT"},
    
    Internally the left and right channels are powered separately.
    When none of the channels are needed the amplifier is powered
    down:
    hard power: valid GPIO number is passed within platform data
    soft power: Using the software shutdown of the amplifier
    Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@nokia.com>
    Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
    493b67ef
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