linux-kernel - Re: [PATCH 1/3] ASoC: jack: Add a jack detect callback via codec

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Date:	Mon, 18 Apr 2016 18:20:00 +0800
From:	Xing Zheng <zhengxing@...k-chips.com>
To:	Mark Brown <broonie@...nel.org>
CC:	linux-rockchip@...ts.infradead.org, heiko@...ech.de,
	Adam.Thomson@...semi.com, sugar.zhang@...k-chips.com,
	jay.xu@...k-chips.com, Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] ASoC: jack: Add a jack detect callback via codec

On 2016年04月18日 18:03, Xing Zheng wrote:
> HI Mark,
>
> On 2016年04月18日 17:53, Mark Brown wrote:
>> On Mon, Apr 18, 2016 at 05:43:51PM +0800, Xing Zheng wrote:
>>
>>> The patch_1/3 add an export of a function that calls the _detect_jack_
>>> function
>>> when a codec supports jack detection and fill the _detect_jack_ 
>>> function in
>>> the
>>> struct snd_soc_codec_driver.
>> But why would anything ever call this function?  How is this supposed to
>> be used?
> In my opinion, this function is mainly to provide simple-card 
> (patch_2/3).
>
> This function will call and initialize jack detection if a codec 
> supports it and fill the detect_jack function (patch_3/3 use it),
> and, we don't need to create a customized machine driver to call the 
> codec jack detection, the simple-card is able to
> parse them.
>
> Thanks.
>
The dts usage like this:

sound {
         ......
         simple-audio-card,dai-link@0 {
             format = "i2s";
             cpu {
                 sound-dai = <&i2s0>;
             };

             codec {
                 sound-dai = <&codec>;

                 simple-audio-card,codec-jack =
                     "JACK_HEADSET",
                     "JACK_BTN_0",
                     "JACK_BTN_1",
                     "JACK_BTN_2",
                     "JACK_BTN_3";
             };
         };
         ......
};

-- 
- Xing Zheng