[PATCH] ASoC: fsl_spdif: add ALSA event on dpll locked

[<robert.rosengren@xxxxxxxx>]

From: Robert Rosengren <robert.rosengren@xxxxxxxx>

Add an ALSA event on the RX Sample Rate controller upon the dpll locked
interrupt, making it possible for audio applications to monitor changes
in the hardware.

Signed-off-by: Robert Rosengren <robert.rosengren@xxxxxxxx>
---
 sound/soc/fsl/fsl_spdif.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
index 7fc1c96929bb..1679a21ffdca 100644
--- a/sound/soc/fsl/fsl_spdif.c
+++ b/sound/soc/fsl/fsl_spdif.c
@@ -44,6 +44,8 @@ static u8 srpc_dpll_locked[] = { 0x0, 0x1, 0x2, 0x3, 0x4, 0xa, 0xb };
 
 #define DEFAULT_RXCLK_SRC	1
 
+#define RX_SAMPLE_RATE_KCONTROL "RX Sample Rate"
+
 /**
  * struct fsl_spdif_soc_data: soc specific data
  *
@@ -122,6 +124,7 @@ struct fsl_spdif_priv {
 	const struct fsl_spdif_soc_data *soc;
 	struct spdif_mixer_control fsl_spdif_control;
 	struct snd_soc_dai_driver cpu_dai_drv;
+	struct snd_soc_dai *dai;
 	struct platform_device *pdev;
 	struct regmap *regmap;
 	bool dpll_locked;
@@ -223,9 +226,19 @@ static void spdif_irq_dpll_lock(struct fsl_spdif_priv *spdif_priv)
 	locked &= SRPC_DPLL_LOCKED;
 
 	dev_dbg(&pdev->dev, "isr: Rx dpll %s \n",
-			locked ? "locked" : "loss lock");
+		locked ? "locked" : "loss lock");
 
 	spdif_priv->dpll_locked = locked ? true : false;
+
+	if (spdif_priv->dai) {
+		struct snd_soc_component *component = spdif_priv->dai->component;
+		struct snd_kcontrol *kctl = snd_soc_card_get_kcontrol(component->card,
+						RX_SAMPLE_RATE_KCONTROL);
+
+		if (kctl)
+			snd_ctl_notify(component->card->snd_card,
+				SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
+	}
 }
 
 /* Receiver found illegal symbol interrupt handler */
@@ -1197,7 +1210,7 @@ static struct snd_kcontrol_new fsl_spdif_ctrls[] = {
 	/* DPLL lock info get controller */
 	{
 		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
-		.name = "RX Sample Rate",
+		.name = RX_SAMPLE_RATE_KCONTROL,
 		.access = SNDRV_CTL_ELEM_ACCESS_READ |
 			SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 		.info = fsl_spdif_rxrate_info,
@@ -1241,6 +1254,7 @@ static struct snd_kcontrol_new fsl_spdif_ctrls_rcm[] = {
 static int fsl_spdif_dai_probe(struct snd_soc_dai *dai)
 {
 	struct fsl_spdif_priv *spdif_private = snd_soc_dai_get_drvdata(dai);
+	spdif_private->dai = dai;
 
 	snd_soc_dai_init_dma_data(dai, &spdif_private->dma_params_tx,
 				  &spdif_private->dma_params_rx);
-- 
2.30.2