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@xxxxxxxxxxxxxxxxxxxx>
---...
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
+Why do you need this?
+
+/**
+ * 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);
+ 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,Not sure how it would work, Where are these interrupts enabled in the pmic?
+ 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;
+ }
+ }
+
ret = clk_prepare_enable(priv->mclk);