Add support for Dion Audio LOCO DAC-AMP HAT

Using dedicated machine driver and pcm5102a codec driver.

Signed-off-by: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>

diff --git a/sound/soc/bcm/dionaudio_loco.c b/sound/soc/bcm/dionaudio_loco.c
new file mode 100644 (file)
index 0000000..5f78643
--- /dev/null
+++ b/sound/soc/bcm/dionaudio_loco.c
@@ -0,0 +1,115 @@
+/*
+ * ASoC Driver for Dion Audio LOCO DAC-AMP
+ *
+ * Author:      Miquel Blauw <info@dionaudio.nl>
+ *              Copyright 2016
+ *
+ * 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 int snd_rpi_dionaudio_loco_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_ops = {
+       .hw_params = snd_rpi_dionaudio_loco_hw_params,
+};
+
+static struct snd_soc_dai_link snd_rpi_dionaudio_loco_dai[] = {
+{
+       .name           = "DionAudio LOCO",
+       .stream_name    = "DionAudio LOCO DAC-AMP",
+       .cpu_dai_name   = "bcm2708-i2s.0",
+       .codec_dai_name = "pcm5102a-hifi",
+       .platform_name  = "bcm2708-i2s.0",
+       .codec_name     = "pcm5102a-codec",
+       .dai_fmt        = SND_SOC_DAIFMT_I2S |
+                         SND_SOC_DAIFMT_NB_NF |
+                         SND_SOC_DAIFMT_CBS_CFS,
+       .ops            = &snd_rpi_dionaudio_loco_ops,
+},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_rpi_dionaudio_loco = {
+       .name           = "snd_rpi_dionaudio_loco",
+       .dai_link       = snd_rpi_dionaudio_loco_dai,
+       .num_links      = ARRAY_SIZE(snd_rpi_dionaudio_loco_dai),
+};
+
+static int snd_rpi_dionaudio_loco_probe(struct platform_device *pdev)
+{
+       struct device_node *np;
+       int ret = 0;
+
+       snd_rpi_dionaudio_loco.dev = &pdev->dev;
+
+       np = pdev->dev.of_node;
+       if (np) {
+               struct snd_soc_dai_link *dai = &snd_rpi_dionaudio_loco_dai[0];
+               struct device_node *i2s_np;
+
+               i2s_np = of_parse_phandle(np, "i2s-controller", 0);
+               if (i2s_np) {
+                       dai->cpu_dai_name = NULL;
+                       dai->cpu_of_node = i2s_np;
+                       dai->platform_name = NULL;
+                       dai->platform_of_node = i2s_np;
+               }
+       }
+
+       ret = devm_snd_soc_register_card(&pdev->dev, &snd_rpi_dionaudio_loco);
+       if (ret && ret != -EPROBE_DEFER)
+               dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
+                       ret);
+
+       return ret;
+}
+
+static const struct of_device_id snd_rpi_dionaudio_loco_of_match[] = {
+       { .compatible = "dionaudio,loco-pcm5242-tpa3118", },
+       { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, snd_rpi_dionaudio_loco_of_match);
+
+static struct platform_driver snd_rpi_dionaudio_loco_driver = {
+       .driver = {
+               .name           = "snd-dionaudio-loco",
+               .owner          = THIS_MODULE,
+               .of_match_table = snd_rpi_dionaudio_loco_of_match,
+       },
+       .probe  = snd_rpi_dionaudio_loco_probe,
+};
+
+module_platform_driver(snd_rpi_dionaudio_loco_driver);
+
+MODULE_AUTHOR("Miquel Blauw <info@dionaudio.nl>");
+MODULE_DESCRIPTION("ASoC Driver for DionAudio LOCO");
+MODULE_LICENSE("GPL v2");