[alsa-devel] [PATCH 2/3] ASoC: simple-card: Add support jack detection via codec

[Xing Zheng]

On 2016年04月21日 22:19, Rob Herring wrote:
> On Mon, Apr 18, 2016 at 04:17:31PM +0800, Xing Zheng wrote:
>> In most cases, many codecs already supports jack detection, previouslly,
>> we need to create a customized machine driver every time.
>>
>> Hence, the simple-card need to support use them dynamically via parse dts
>> file for better flexibility.
>>
>> Signed-off-by: Xing Zheng <zhengxing at rock-chips.com>
>> ---
>>
>>   .../devicetree/bindings/sound/simple-card.txt      |   17 +++
>>   sound/soc/generic/simple-card.c                    |  126 +++++++++++++++++++-
>>   2 files changed, 140 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/sound/simple-card.txt b/Documentation/devicetree/bindings/sound/simple-card.txt
>> index cf3979e..d25c8eb 100644
>> --- a/Documentation/devicetree/bindings/sound/simple-card.txt
>> +++ b/Documentation/devicetree/bindings/sound/simple-card.txt
>> @@ -22,6 +22,23 @@ Optional properties:
>>   					  headphones are attached.
>>   - simple-audio-card,mic-det-gpio	: Reference to GPIO that signals when
>>   					  a microphone is attached.
>> +- simple-audio-card,codec-jack		: A list of the codec supports jack detection.
>> +					  The jack types which are supported refer to include/sound/jack.h.
>> +					  All of the jack types:
>> +						"JACK_HEADPHONE",
>> +						"JACK_MICROPHONE",
>> +						"JACK_HEADSET",
>> +						"JACK_LINEOUT",
>> +						"JACK_MECHANICAL",
>> +						"JACK_VIDEOOUT",
>> +						"JACK_AVOUT",
>> +						"JACK_LINEIN",
>> +						"JACK_BTN_0",
>> +						"JACK_BTN_1",
>> +						"JACK_BTN_2",
>> +						"JACK_BTN_3",
>> +						"JACK_BTN_4",
>> +						"JACK_BTN_5".
> simple-card is not so simple...
>
> I think this information be part of the codec node if the codec
> provides the functionality. The binding should not be different whether
> a codec is part of simple-card or not. Also, I would make all these just
> boolean props.
Yes, these things seem like make simple-card becomes more complicated, 
and the generic jack detection method is still a problem currently.

Hi Mark, the other question here, how do we make sense to use the 
simple-card to call the "snd_soc_dai_set_pll" if the codec (like da7219) 
requires do this?

Thanks.

-- 
- Xing Zheng