linux-kernel - Re: [PATCH v1 2/3] ASoC: codecs: msm8916-analog: support jack detection

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Date:   Wed, 26 Jul 2017 17:44:14 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Damien Riegel <damien.riegel@...oirfairelinux.com>,
        alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org, Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Patrick Lai <plai@...eaurora.org>,
        Banajit Goswami <bgoswami@...eaurora.org>,
        kernel@...oirfairelinux.com
Subject: Re: [PATCH v1 2/3] ASoC: codecs: msm8916-analog: support jack
 detection



On 25/07/17 18:51, Damien Riegel wrote:
> The audio codec in the PM8916 has a feature called Multi-Button Headset
> Control (MBHC). It can support of up to five buttons on a headset, and
> jack insertion/removal detection.
> 
> This patch only supports the jack detection. A complete implementation
> is available in the Android kernel [1] for reference.
> 
> [1] https://source.codeaurora.org/quic/la/kernel/msm-4.4/tree/sound/soc/codecs/wcd-mbhc-v2.c?h=LA.BR.1.2.4-00310-8x16.0
> 
> Signed-off-by: Damien Riegel <damien.riegel@...oirfairelinux.com>

If you have noticed it or not, but in the dai_shutdown patch the codec 
is put in reset state, so this code only works for one time.
Once you do a playback session and end it this code will stop working.


> ---
>   sound/soc/codecs/msm8916-wcd-analog.c | 103 ++++++++++++++++++++++++++++++++++
>   sound/soc/codecs/msm8916-wcd-analog.h |  18 ++++++
>   2 files changed, 121 insertions(+)
>   create mode 100644 sound/soc/codecs/msm8916-wcd-analog.h
> 
> diff --git a/sound/soc/codecs/msm8916-wcd-analog.c b/sound/soc/codecs/msm8916-wcd-analog.c
>
...
> +
> +
> +/**
> + * pm8916_wcd_analog_jack_detect - Enable jack detection.
> + *
> + * @codec:         msm8916 codec
> + * @jack:          jack to report detection events on
> + *
> + * Enables jack detection of the pm8916-analog. It is capable of reporting
> + * mechanical insertion.
> + */
> +int pm8916_wcd_analog_jack_detect(struct snd_soc_codec *codec,
> +				  struct snd_soc_jack *jack)
> +{
> +	struct pm8916_wcd_analog_priv *priv = snd_soc_codec_get_drvdata(codec);
> +
> +	priv->jack = jack;
> +
> +	snd_soc_update_bits(codec, CDC_D_CDC_RST_CTL,
> +			    RST_CTL_DIG_SW_RST_N_MASK,
> +			    RST_CTL_DIG_SW_RST_N_REMOVE_RESET);
Why do you need this?

> +	snd_soc_write(codec, CDC_A_MBHC_DET_CTL_1, 0xB5);

> +	snd_soc_write(codec, CDC_A_MBHC_DET_CTL_2, 0xE1);

> +	snd_soc_write(codec, CDC_A_MBHC_DBNC_TIMER, 0x98);
What do these values mean?
> +	snd_soc_update_bits(codec, CDC_D_CDC_DIG_CLK_CTL,
> +			    DIG_CLK_CTL_MBHC_EN_MASK,
> +			    DIG_CLK_CTL_MBHC_EN);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(pm8916_wcd_analog_jack_detect);
> +
>   static const struct snd_soc_dapm_route pm8916_wcd_analog_audio_map[] = {
>   
>   	{"PDM_RX1", NULL, "PDM Playback"},
> @@ -799,6 +873,14 @@ static struct snd_soc_codec_driver pm8916_wcd_analog = {
>   	},
>   };
>   
> +static struct jack_detect_irq {
> +	const char *name;
> +	irqreturn_t (*handler)(int, void *);
> +} jack_detect_irqs[] = {
> +	{ "mbhc_switch_int", pm8916_wcd_analog_mbhc_switch_handler },
> +	/* other MBHC related interrupts are not handled yet */
> +};
> +
>   static int pm8916_wcd_analog_parse_dt(struct device *dev,
>   				       struct pm8916_wcd_analog_priv *priv)
>   {
> @@ -846,6 +928,27 @@ static int pm8916_wcd_analog_spmi_probe(struct platform_device *pdev)
>   		return ret;
>   	}
>   
> +	for (i = 0; i < ARRAY_SIZE(jack_detect_irqs); i++) {
> +		int irq;
> +
> +		irq = platform_get_irq_byname(pdev, jack_detect_irqs[i].name);
> +		if (irq < 0) {
> +			dev_warn(dev, "failed to get irq '%s', jack insertion detection disabled\n",
> +				 jack_detect_irqs[i].name);
> +			break;
> +		}
> +
> +		ret = devm_request_threaded_irq(dev, irq, NULL,
> +						jack_detect_irqs[i].handler,
> +						IRQF_ONESHOT,
> +						jack_detect_irqs[i].name, priv);
> +		if (ret) {
> +			dev_err(dev, "failed to request irq '%s': %d\n",
> +				jack_detect_irqs[i].name, ret);
> +			return ret;
> +		}
> +	}
> +
Not sure how it would work, Where are these interrupts enabled in the pmic?

>   	ret = clk_prepare_enable(priv->mclk);