[PATCH 1/2] ASoC: Add driver for PROTO Audio CODEC (with a WM8731)
From: Codrin Ciubotariu
Date: Wed Aug 29 2018 - 10:47:50 EST
Add support for the MikroElektronika PROTO audio codec board.
URL to the audio chip:
http://www.mikroe.com/add-on-boards/audio-voice/audio-codec-proto/
Signed-off-by: Florian Meier <florian.meier@xxxxxxxx>
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@xxxxxxxxxxxxx>
---
sound/soc/atmel/Kconfig | 7 ++
sound/soc/atmel/Makefile | 2 +
sound/soc/atmel/mikroe-proto.c | 189 +++++++++++++++++++++++++++++++++
3 files changed, 198 insertions(+)
create mode 100644 sound/soc/atmel/mikroe-proto.c
diff --git a/sound/soc/atmel/Kconfig b/sound/soc/atmel/Kconfig
index 539ef33e670a..fbf4d3e42c18 100644
--- a/sound/soc/atmel/Kconfig
+++ b/sound/soc/atmel/Kconfig
@@ -97,4 +97,11 @@ config SND_ATMEL_SOC_I2S
help
Say Y or M if you want to add support for Atmel ASoc driver for boards
using I2S.
+
+config SND_SOC_MIKROE_PROTO
+ tristate "Support for Mikroe-PROTO board"
+ depends on OF
+ select SND_SOC_WM8731
+ help
+ Say Y or M if you want to add support for Audio Codec Board PROTO (WM8731).
endif
diff --git a/sound/soc/atmel/Makefile b/sound/soc/atmel/Makefile
index cd87cb4bcff5..9f41bfa0fea3 100644
--- a/sound/soc/atmel/Makefile
+++ b/sound/soc/atmel/Makefile
@@ -17,6 +17,7 @@ snd-soc-sam9x5-wm8731-objs := sam9x5_wm8731.o
snd-atmel-soc-classd-objs := atmel-classd.o
snd-atmel-soc-pdmic-objs := atmel-pdmic.o
snd-atmel-soc-tse850-pcm5142-objs := tse850-pcm5142.o
+snd-soc-mikroe-proto-objs := mikroe-proto.o
obj-$(CONFIG_SND_AT91_SOC_SAM9G20_WM8731) += snd-soc-sam9g20-wm8731.o
obj-$(CONFIG_SND_ATMEL_SOC_WM8904) += snd-atmel-soc-wm8904.o
@@ -24,3 +25,4 @@ obj-$(CONFIG_SND_AT91_SOC_SAM9X5_WM8731) += snd-soc-sam9x5-wm8731.o
obj-$(CONFIG_SND_ATMEL_SOC_CLASSD) += snd-atmel-soc-classd.o
obj-$(CONFIG_SND_ATMEL_SOC_PDMIC) += snd-atmel-soc-pdmic.o
obj-$(CONFIG_SND_ATMEL_SOC_TSE850_PCM5142) += snd-atmel-soc-tse850-pcm5142.o
+obj-$(CONFIG_SND_SOC_MIKROE_PROTO) += snd-soc-mikroe-proto.o
diff --git a/sound/soc/atmel/mikroe-proto.c b/sound/soc/atmel/mikroe-proto.c
new file mode 100644
index 000000000000..9d9dc1c8ac6b
--- /dev/null
+++ b/sound/soc/atmel/mikroe-proto.c
@@ -0,0 +1,189 @@
+/*
+ * ASoC driver for PROTO AudioCODEC (with a WM8731)
+ *
+ * Author: Florian Meier, <koalo@xxxxxxxx>
+ * Copyright 2013
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+
+#include "../codecs/wm8731.h"
+
+#define XTAL_RATE 12288000 /* This is fixed on this board */
+
+static const unsigned int wm8731_rates_12288000[] = {
+ 8000, 32000, 48000, 96000,
+};
+
+static struct snd_pcm_hw_constraint_list wm8731_constraints_12288000 = {
+ .list = wm8731_rates_12288000,
+ .count = ARRAY_SIZE(wm8731_rates_12288000),
+};
+
+static int snd_proto_startup(struct snd_pcm_substream *substream)
+{
+ /* Setup constraints, because there is a 12.288 MHz XTAL on the board */
+ snd_pcm_hw_constraint_list(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_RATE,
+ &wm8731_constraints_12288000);
+ return 0;
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_proto_ops = {
+ .startup = snd_proto_startup,
+};
+
+static int snd_proto_init(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_soc_codec *codec = rtd->codec;
+ struct snd_soc_dai *codec_dai = rtd->codec_dai;
+
+ /* Set proto sysclk */
+ int ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
+ XTAL_RATE, SND_SOC_CLOCK_IN);
+ if (ret < 0) {
+ dev_err(codec->dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct snd_soc_dapm_widget snd_proto_widget[] = {
+ SND_SOC_DAPM_MIC("Microphone Jack", NULL),
+ SND_SOC_DAPM_HP("Headphone Jack", NULL),
+};
+
+static const struct snd_soc_dapm_route snd_proto_route[] = {
+ /* speaker connected to LHPOUT/RHPOUT */
+ {"Headphone Jack", NULL, "LHPOUT"},
+ {"Headphone Jack", NULL, "RHPOUT"},
+
+ /* mic is connected to Mic Jack, with WM8731 Mic Bias */
+ {"MICIN", NULL, "Mic Bias"},
+ {"Mic Bias", NULL, "Microphone Jack"},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_proto = {
+ .name = "snd_mikroe_proto",
+ .owner = THIS_MODULE,
+ .dapm_widgets = snd_proto_widget,
+ .num_dapm_widgets = ARRAY_SIZE(snd_proto_widget),
+ .dapm_routes = snd_proto_route,
+ .num_dapm_routes = ARRAY_SIZE(snd_proto_route),
+};
+
+static int snd_proto_probe(struct platform_device *pdev)
+{
+ struct snd_soc_dai_link *dai;
+ struct device_node *np = pdev->dev.of_node;
+ struct device_node *codec_np, *cpu_np;
+ struct device_node *bitclkmaster = NULL;
+ struct device_node *framemaster = NULL;
+ unsigned int dai_fmt;
+ int ret = 0;
+
+ if (!np) {
+ dev_err(&pdev->dev, "No device node supplied\n");
+ return -EINVAL;
+ }
+
+ snd_proto.dev = &pdev->dev;
+ ret = snd_soc_of_parse_card_name(&snd_proto, "model");
+ if (ret)
+ return ret;
+
+ dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
+ if (!dai)
+ return -ENOMEM;
+
+ snd_proto.dai_link = dai;
+ snd_proto.num_links = 1;
+
+ dai->name = "WM8731";
+ dai->stream_name = "WM8731 HiFi";
+ dai->codec_dai_name = "wm8731-hifi";
+ dai->init = &snd_proto_init;
+ dai->ops = &snd_proto_ops;
+
+ codec_np = of_parse_phandle(np, "audio-codec", 0);
+ if (!codec_np) {
+ dev_err(&pdev->dev, "audio-codec node missing\n");
+ return -EINVAL;
+ }
+ dai->codec_of_node = codec_np;
+
+ cpu_np = of_parse_phandle(np, "i2s-controller", 0);
+ if (!cpu_np) {
+ dev_err(&pdev->dev, "i2s-controller missing\n");
+ return -EINVAL;
+ }
+ dai->cpu_of_node = cpu_np;
+ dai->platform_of_node = cpu_np;
+
+ dai_fmt = snd_soc_of_parse_daifmt(np, NULL,
+ &bitclkmaster, &framemaster);
+ if (bitclkmaster != framemaster) {
+ dev_err(&pdev->dev, "Must be the same bitclock and frame master\n");
+ return -EINVAL;
+ }
+ if (bitclkmaster) {
+ dai_fmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
+ if (codec_np == bitclkmaster)
+ dai_fmt |= SND_SOC_DAIFMT_CBM_CFM;
+ else
+ dai_fmt |= SND_SOC_DAIFMT_CBS_CFS;
+ }
+ of_node_put(bitclkmaster);
+ of_node_put(framemaster);
+ dai->dai_fmt = dai_fmt;
+
+ of_node_put(codec_np);
+ of_node_put(cpu_np);
+
+ ret = snd_soc_register_card(&snd_proto);
+ if (ret && ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev,
+ "snd_soc_register_card() failed: %d\n", ret);
+
+ return ret;
+}
+
+static int snd_proto_remove(struct platform_device *pdev)
+{
+ return snd_soc_unregister_card(&snd_proto);
+}
+
+static const struct of_device_id snd_proto_of_match[] = {
+ { .compatible = "mikroe,mikroe-proto", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, snd_proto_of_match);
+
+static struct platform_driver snd_proto_driver = {
+ .driver = {
+ .name = "snd-mikroe-proto",
+ .owner = THIS_MODULE,
+ .of_match_table = snd_proto_of_match,
+ },
+ .probe = snd_proto_probe,
+ .remove = snd_proto_remove,
+};
+
+module_platform_driver(snd_proto_driver);
+
+MODULE_AUTHOR("Florian Meier");
+MODULE_DESCRIPTION("ASoC Driver for PROTO board (WM8731)");
+MODULE_LICENSE("GPL");
--
2.17.1