[PATCH] ASoC: sunxi: sun4i-spdif: Implement IEC958 control

[Jernej Skrabec <jernej.skrabec@xxxxxxxxx>]

SPDIF core is capable of sending custom status.

Implement IEC958 control handling.

Signed-off-by: Jernej Skrabec <jernej.skrabec@xxxxxxxxx>
---
 sound/soc/sunxi/sun4i-spdif.c | 99 +++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)

diff --git a/sound/soc/sunxi/sun4i-spdif.c b/sound/soc/sunxi/sun4i-spdif.c
index a10949bf0ca1..f7438e3ece65 100644
--- a/sound/soc/sunxi/sun4i-spdif.c
+++ b/sound/soc/sunxi/sun4i-spdif.c
@@ -21,6 +21,7 @@
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
+#include <sound/asoundef.h>
 #include <sound/dmaengine_pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
@@ -385,11 +386,109 @@ static int sun4i_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
 	return ret;
 }
 
+static int sun4i_spdif_info(struct snd_kcontrol *kcontrol,
+			    struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
+	uinfo->count = 1;
+
+	return 0;
+}
+
+static int sun4i_spdif_get_status_mask(struct snd_kcontrol *kcontrol,
+				       struct snd_ctl_elem_value *ucontrol)
+{
+	u8 *status = ucontrol->value.iec958.status;
+
+	status[0] = 0xff;
+	status[1] = 0xff;
+	status[2] = 0xff;
+	status[3] = 0xff;
+	status[4] = 0xff;
+	status[5] = 0x03;
+
+	return 0;
+}
+
+static int sun4i_spdif_get_status(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
+	u8 *status = ucontrol->value.iec958.status;
+	unsigned int reg;
+
+	regmap_read(host->regmap, SUN4I_SPDIF_TXCHSTA0, &reg);
+
+	status[0] = reg & 0xff;
+	status[1] = (reg >> 8) & 0xff;
+	status[2] = (reg >> 16) & 0xff;
+	status[3] = (reg >> 24) & 0xff;
+
+	regmap_read(host->regmap, SUN4I_SPDIF_TXCHSTA1, &reg);
+
+	status[4] = reg & 0xff;
+	status[5] = (reg >> 8) & 0x3;
+
+	return 0;
+}
+
+static int sun4i_spdif_set_status(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
+	u8 *status = ucontrol->value.iec958.status;
+	unsigned int reg;
+
+	reg = (u32)status[3] << 24;
+	reg |= (u32)status[2] << 16;
+	reg |= (u32)status[1] << 8;
+	reg |= (u32)status[0];
+
+	regmap_write(host->regmap, SUN4I_SPDIF_TXCHSTA0, reg);
+
+	reg = (u32)(status[5] & 3) << 8;
+	reg |= (u32)status[4];
+
+	regmap_write(host->regmap, SUN4I_SPDIF_TXCHSTA1, reg);
+
+	reg = SUN4I_SPDIF_TXCFG_CHSTMODE;
+	if (status[0] & IEC958_AES0_NONAUDIO)
+		reg |= SUN4I_SPDIF_TXCFG_NONAUDIO;
+
+	regmap_update_bits(host->regmap, SUN4I_SPDIF_TXCFG,
+			   SUN4I_SPDIF_TXCFG_CHSTMODE |
+			   SUN4I_SPDIF_TXCFG_NONAUDIO, reg);
+
+	return 0;
+}
+
+static struct snd_kcontrol_new sun4i_spdif_controls[] = {
+	{
+		.access = SNDRV_CTL_ELEM_ACCESS_READ,
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, MASK),
+		.info = sun4i_spdif_info,
+		.get = sun4i_spdif_get_status_mask
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
+		.info = sun4i_spdif_info,
+		.get = sun4i_spdif_get_status,
+		.put = sun4i_spdif_set_status
+	}
+};
+
 static int sun4i_spdif_soc_dai_probe(struct snd_soc_dai *dai)
 {
 	struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(dai);
 
 	snd_soc_dai_init_dma_data(dai, &host->dma_params_tx, NULL);
+	snd_soc_add_dai_controls(dai, sun4i_spdif_controls,
+				 ARRAY_SIZE(sun4i_spdif_controls));
+
 	return 0;
 }
 
-- 
2.33.1