+/**
+ * wm8994_mic_detect - Enable microphone detection via the WM8994 IRQ
+ *
+ * @codec: WM8994 codec
+ * @jack: jack to report detection events on
+ * @micbias: microphone bias to detect on
+ * @det: value to report for presence detection
+ * @shrt: value to report for short detection
+ *
+ * Enable microphone detection via IRQ on the WM8994. If GPIOs are
+ * being used to bring out signals to the processor then only platform
+ * data configuration is needed for WM8903 and processor GPIOs should
+ * be configured using snd_soc_jack_add_gpios() instead.
+ *
+ * Configuration of detection levels is available via the micbias1_lvl
+ * and micbias2_lvl platform data members.
+ */
+int wm8994_mic_detect(struct snd_soc_codec *codec, struct snd_soc_jack *jack,
+ int micbias, int det, int shrt)
+{
+ struct wm8994_priv *wm8994 = codec->private_data;
+ struct wm8994_micdet *micdet;
+ int reg;
+
+ switch (micbias) {
+ case 1:
+ micdet = &wm8994->micdet[0];
+ break;
+ case 2:
+ micdet = &wm8994->micdet[1];
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ dev_dbg(codec->dev, "Configuring microphone detection on %d: %x %x\n",
+ micbias, det, shrt);
+
+ /* Store the configuration */
+ micdet->jack = jack;
+ micdet->det = det;
+ micdet->shrt = shrt;
+
+ /* If either of the jacks is set up then enable detection */
+ if (wm8994->micdet[0].jack || wm8994->micdet[1].jack)
+ reg = WM8994_MICD_ENA;
+ else
+ reg = 0;
+
+ snd_soc_update_bits(codec, WM8994_MICBIAS, WM8994_MICD_ENA, reg);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(wm8994_mic_detect);
+
+static irqreturn_t wm8994_mic_irq(int irq, void *data)
+{
+ struct wm8994_priv *priv = data;
+ struct snd_soc_codec *codec = &priv->codec;
+ int reg;
+ int report;
+
+ reg = snd_soc_read(codec, WM8994_INTERRUPT_RAW_STATUS_2);
+ if (reg < 0) {
+ dev_err(codec->dev, "Failed to read microphone status: %d\n",
+ reg);
+ return IRQ_HANDLED;
+ }
+
+ dev_dbg(codec->dev, "Microphone status: %x\n", reg);
+
+ report = 0;
+ if (reg & WM8994_MIC1_DET_STS)
+ report |= priv->micdet[0].det;
+ if (reg & WM8994_MIC1_SHRT_STS)
+ report |= priv->micdet[0].shrt;
+ snd_soc_jack_report(priv->micdet[0].jack, report,
+ priv->micdet[0].det | priv->micdet[0].shrt);
+
+ report = 0;
+ if (reg & WM8994_MIC2_DET_STS)
+ report |= priv->micdet[1].det;
+ if (reg & WM8994_MIC2_SHRT_STS)
+ report |= priv->micdet[1].shrt;
+ snd_soc_jack_report(priv->micdet[1].jack, report,
+ priv->micdet[1].det | priv->micdet[1].shrt);
+
+ return IRQ_HANDLED;
+}
+