sound: Support for Dion Audio LOCO-V2 DAC-AMP HAT

Signed-off-by: Miquel Blauw <[email protected]>

sound/soc/bcm/Kconfig

@@ -134,6 +134,13 @@ config SND_BCM2708_SOC_DIONAUDIO_LOCO
 	help
 	  Say Y or M if you want to add support for Dion Audio LOCO.
 
+config SND_BCM2708_SOC_DIONAUDIO_LOCO_V2
+	tristate "Support for Dion Audio LOCO-V2 DAC-AMP"
+	depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+	select SND_SOC_PCM5122
+	help
+	  Say Y or M if you want to add support for Dion Audio LOCO-V2.
+
 config SND_BCM2708_SOC_ALLO_PIANO_DAC
 	tristate "Support for Allo Piano DAC"
 	depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S

sound/soc/bcm/Makefile

@@ -25,6 +25,7 @@ snd-soc-raspidac3-objs := raspidac3.o
 snd-soc-audioinjector-pi-soundcard-objs := audioinjector-pi-soundcard.o
 snd-soc-digidac1-soundcard-objs := digidac1-soundcard.o
 snd-soc-dionaudio-loco-objs := dionaudio_loco.o
+snd-soc-dionaudio-loco-v2-objs := dionaudio_loco-v2.o
 snd-soc-allo-piano-dac-objs := allo-piano-dac.o
 snd-soc-pisound-objs := pisound.o
 
@@ -44,5 +45,6 @@ obj-$(CONFIG_SND_BCM2708_SOC_RASPIDAC3) += snd-soc-raspidac3.o
 obj-$(CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD) += snd-soc-audioinjector-pi-soundcard.o
 obj-$(CONFIG_SND_DIGIDAC1_SOUNDCARD) += snd-soc-digidac1-soundcard.o
 obj-$(CONFIG_SND_BCM2708_SOC_DIONAUDIO_LOCO) += snd-soc-dionaudio-loco.o
+obj-$(CONFIG_SND_BCM2708_SOC_DIONAUDIO_LOCO_V2) += snd-soc-dionaudio-loco-v2.o
 obj-$(CONFIG_SND_BCM2708_SOC_ALLO_PIANO_DAC) += snd-soc-allo-piano-dac.o
 obj-$(CONFIG_SND_PISOUND) += snd-soc-pisound.o

sound/soc/bcm/dionaudio_loco-v2.c

@@ -0,0 +1,140 @@
+/*
+ * ASoC Driver for Dion Audio LOCO-V2 DAC-AMP
+ *
+ * Author:      Miquel Blauw <[email protected]>
+ *              Copyright 2017
+ *
+ * Based on the software of the RPi-DAC writen by Florian Meier
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+
+static bool digital_gain_0db_limit = true;
+
+static int snd_rpi_dionaudio_loco_v2_init(struct snd_soc_pcm_runtime *rtd)
+{
+	if (digital_gain_0db_limit) {
+		int ret;
+		struct snd_soc_card *card = rtd->card;
+
+		ret = snd_soc_limit_volume(card, "Digital Playback Volume", 207);
+		if (ret < 0)
+			dev_warn(card->dev, "Failed to set volume limit: %d\n", ret);
+	}
+
+	return 0;
+}
+
+static int snd_rpi_dionaudio_loco_v2_hw_params(
+	struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+
+	unsigned int sample_bits =
+		snd_pcm_format_physical_width(params_format(params));
+
+	return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_rpi_dionaudio_loco_v2_ops = {
+	.hw_params = snd_rpi_dionaudio_loco_v2_hw_params,
+};
+
+static struct snd_soc_dai_link snd_rpi_dionaudio_loco_v2_dai[] = {
+{
+	.name		= "DionAudio LOCO-V2",
+	.stream_name	= "DionAudio LOCO-V2 DAC-AMP",
+	.cpu_dai_name	= "bcm2708-i2s.0",
+	.codec_dai_name	= "pcm512x-hifi",
+	.platform_name	= "bcm2708-i2s.0",
+	.codec_name	= "pcm512x.1-004d",
+	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+			  SND_SOC_DAIFMT_CBS_CFS,
+	.ops		= &snd_rpi_dionaudio_loco_v2_ops,
+	.init		= snd_rpi_dionaudio_loco_v2_init,
+},};
+
+/* audio machine driver */
+static struct snd_soc_card snd_rpi_dionaudio_loco_v2 = {
+	.name         = "Dion Audio LOCO-V2",
+	.dai_link     = snd_rpi_dionaudio_loco_v2_dai,
+	.num_links    = ARRAY_SIZE(snd_rpi_dionaudio_loco_v2_dai),
+};
+
+static int snd_rpi_dionaudio_loco_v2_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	snd_rpi_dionaudio_loco_v2.dev = &pdev->dev;
+
+	if (pdev->dev.of_node) {
+		struct device_node *i2s_node;
+		struct snd_soc_dai_link *dai =
+					&snd_rpi_dionaudio_loco_v2_dai[0];
+
+		i2s_node = of_parse_phandle(pdev->dev.of_node,
+					    "i2s-controller", 0);
+		if (i2s_node) {
+			dai->cpu_dai_name = NULL;
+			dai->cpu_of_node = i2s_node;
+			dai->platform_name = NULL;
+			dai->platform_of_node = i2s_node;
+		}
+
+		digital_gain_0db_limit = !of_property_read_bool(
+			pdev->dev.of_node, "dionaudio,24db_digital_gain");
+	}
+
+	ret = snd_soc_register_card(&snd_rpi_dionaudio_loco_v2);
+	if (ret)
+		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
+			ret);
+
+	return ret;
+}
+
+static int snd_rpi_dionaudio_loco_v2_remove(struct platform_device *pdev)
+{
+	return snd_soc_unregister_card(&snd_rpi_dionaudio_loco_v2);
+}
+
+static const struct of_device_id dionaudio_of_match[] = {
+	{ .compatible = "dionaudio,dionaudio-loco-v2", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, dionaudio_of_match);
+
+static struct platform_driver snd_rpi_dionaudio_loco_v2_driver = {
+	.driver = {
+		.name   = "snd-rpi-dionaudio-loco-v2",
+		.owner  = THIS_MODULE,
+		.of_match_table = dionaudio_of_match,
+	},
+	.probe          = snd_rpi_dionaudio_loco_v2_probe,
+	.remove         = snd_rpi_dionaudio_loco_v2_remove,
+};
+
+module_platform_driver(snd_rpi_dionaudio_loco_v2_driver);
+
+MODULE_AUTHOR("Miquel Blauw <[email protected]>");
+MODULE_DESCRIPTION("ASoC Driver for DionAudio LOCO-V2");
+MODULE_LICENSE("GPL v2");