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openwrt/target/linux/brcm2708/patches-4.9/950-0080-Add-IQAudIO-Digi-W...

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From 5d70e6012f390d6292ea8017cebb947a003fce00 Mon Sep 17 00:00:00 2001
From: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
Date: Thu, 30 Jun 2016 18:38:42 +0100
Subject: [PATCH] Add IQAudIO Digi WM8804 board support
Support IQAudIO Digi board with iqaudio_digi machine driver and
iqaudio-digi-wm8804-audio overlay.
NB. Machine driver is a cut and paste of hifiberry_digi code, with format
and general cleanup to comply with kernel coding standards.
Signed-off-by: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
---
sound/soc/bcm/Kconfig | 7 ++
sound/soc/bcm/Makefile | 2 +
sound/soc/bcm/iqaudio_digi.c | 239 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 248 insertions(+)
create mode 100644 sound/soc/bcm/iqaudio_digi.c
--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -80,6 +80,13 @@ config SND_BCM2708_SOC_IQAUDIO_DAC
help
Say Y or M if you want to add support for IQaudIO-DAC.
+config SND_BCM2708_SOC_IQAUDIO_DIGI
+ tristate "Support for IQAudIO Digi"
+ depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+ select SND_SOC_WM8804
+ help
+ Say Y or M if you want to add support for IQAudIO Digital IO board.
+
config SND_BCM2708_SOC_RASPIDAC3
tristate "Support for RaspiDAC Rev.3x"
depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -19,6 +19,7 @@ snd-soc-justboom-digi-objs := justboom-d
snd-soc-rpi-dac-objs := rpi-dac.o
snd-soc-rpi-proto-objs := rpi-proto.o
snd-soc-iqaudio-dac-objs := iqaudio-dac.o
+snd-soc-iqaudio-digi-objs := iqaudio_digi.o
snd-soc-raspidac3-objs := raspidac3.o
snd-soc-audioinjector-pi-soundcard-objs := audioinjector-pi-soundcard.o
@@ -32,6 +33,7 @@ obj-$(CONFIG_SND_BCM2708_SOC_JUSTBOOM_DI
obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
obj-$(CONFIG_SND_BCM2708_SOC_RPI_PROTO) += snd-soc-rpi-proto.o
obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) += snd-soc-iqaudio-dac.o
+obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DIGI) += snd-soc-iqaudio-digi.o
obj-$(CONFIG_SND_BCM2708_SOC_RASPIDAC3) += snd-soc-raspidac3.o
obj-$(CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD) += snd-soc-audioinjector-pi-soundcard.o
--- /dev/null
+++ b/sound/soc/bcm/iqaudio_digi.c
@@ -0,0 +1,239 @@
+/*
+ * ASoC Driver for IQAudIO WM8804 Digi
+ *
+ * Author: Daniel Matuschek <info@crazy-audio.com>
+ * based on the HifiBerry DAC driver by Florian Meier <florian.meier@koalo.de>
+ * 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.
+ *
+ * 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>
+
+#include "../codecs/wm8804.h"
+
+static short int auto_shutdown_output;
+module_param(auto_shutdown_output, short,
+ S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+MODULE_PARM_DESC(auto_shutdown_output, "Shutdown SP/DIF output if playback is stopped");
+
+static int snd_rpi_iqaudio_digi_init(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_soc_codec *codec = rtd->codec;
+
+ /* enable TX output */
+ snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x0);
+
+ return 0;
+}
+
+static int snd_rpi_iqaudio_digi_startup(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_codec *codec = rtd->codec;
+
+ /* turn on digital output */
+ snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x00);
+
+ return 0;
+}
+
+static void snd_rpi_iqaudio_digi_shutdown(struct snd_pcm_substream *substream)
+{
+ if (auto_shutdown_output) {
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_codec *codec = rtd->codec;
+
+ /* turn off digital output */
+ snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x3c);
+ }
+}
+
+
+static int snd_rpi_iqaudio_digi_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 *codec_dai = rtd->codec_dai;
+ struct snd_soc_codec *codec = rtd->codec;
+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+
+ int sysclk = 27000000; /* This is fixed on this board */
+
+ long mclk_freq = 0;
+ int mclk_div = 1;
+ int sampling_freq = 1;
+
+ int ret;
+
+ int samplerate = params_rate(params);
+
+ if (samplerate <= 96000) {
+ mclk_freq = samplerate * 256;
+ mclk_div = WM8804_MCLKDIV_256FS;
+ } else {
+ mclk_freq = samplerate * 128;
+ mclk_div = WM8804_MCLKDIV_128FS;
+ }
+
+ switch (samplerate) {
+ case 32000:
+ sampling_freq = 0x03;
+ break;
+ case 44100:
+ sampling_freq = 0x00;
+ break;
+ case 48000:
+ sampling_freq = 0x02;
+ break;
+ case 88200:
+ sampling_freq = 0x08;
+ break;
+ case 96000:
+ sampling_freq = 0x0a;
+ break;
+ case 176400:
+ sampling_freq = 0x0c;
+ break;
+ case 192000:
+ sampling_freq = 0x0e;
+ break;
+ default:
+ dev_err(codec->dev, "Failed to set WM8804 SYSCLK, unsupported samplerate %d\n",
+ samplerate);
+ }
+
+ snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div);
+ snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq);
+
+ ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL,
+ sysclk, SND_SOC_CLOCK_OUT);
+ if (ret < 0) {
+ dev_err(codec->dev, "Failed to set WM8804 SYSCLK: %d\n", ret);
+ return ret;
+ }
+
+ /* Enable TX output */
+ snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x0);
+
+ /* Power on */
+ snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0);
+
+ /* set sampling frequency status bits */
+ snd_soc_update_bits(codec, WM8804_SPDTX4, 0x0f, sampling_freq);
+
+ return snd_soc_dai_set_bclk_ratio(cpu_dai, 64);
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_rpi_iqaudio_digi_ops = {
+ .hw_params = snd_rpi_iqaudio_digi_hw_params,
+ .startup = snd_rpi_iqaudio_digi_startup,
+ .shutdown = snd_rpi_iqaudio_digi_shutdown,
+};
+
+static struct snd_soc_dai_link snd_rpi_iqaudio_digi_dai[] = {
+{
+ .name = "IQAudIO Digi",
+ .stream_name = "IQAudIO Digi HiFi",
+ .cpu_dai_name = "bcm2708-i2s.0",
+ .codec_dai_name = "wm8804-spdif",
+ .platform_name = "bcm2708-i2s.0",
+ .codec_name = "wm8804.1-003b",
+ .dai_fmt = SND_SOC_DAIFMT_I2S |
+ SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_CBM_CFM,
+ .ops = &snd_rpi_iqaudio_digi_ops,
+ .init = snd_rpi_iqaudio_digi_init,
+},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_rpi_iqaudio_digi = {
+ .name = "IQAudIODigi",
+ .owner = THIS_MODULE,
+ .dai_link = snd_rpi_iqaudio_digi_dai,
+ .num_links = ARRAY_SIZE(snd_rpi_iqaudio_digi_dai),
+};
+
+static int snd_rpi_iqaudio_digi_probe(struct platform_device *pdev)
+{
+ struct snd_soc_card *card = &snd_rpi_iqaudio_digi;
+ char *prefix = "wm8804-digi,";
+ char prop[128];
+ struct device_node *np;
+ int ret = 0;
+
+ snd_rpi_iqaudio_digi.dev = &pdev->dev;
+
+ np = pdev->dev.of_node;
+ if (np) {
+ struct snd_soc_dai_link *dai = &snd_rpi_iqaudio_digi_dai[0];
+ struct device_node *i2s_node;
+
+ i2s_node = of_parse_phandle(np, "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;
+ }
+
+ snprintf(prop, sizeof(prop), "%scard-name", prefix);
+ of_property_read_string(np, prop, &card->name);
+
+ snprintf(prop, sizeof(prop), "%sdai-name", prefix);
+ of_property_read_string(np, prop, &dai->name);
+
+ snprintf(prop, sizeof(prop), "%sdai-stream-name", prefix);
+ of_property_read_string(np, prop, &dai->stream_name);
+ }
+
+ ret = snd_soc_register_card(card);
+ if (ret)
+ dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
+ ret);
+
+ return ret;
+}
+
+static int snd_rpi_iqaudio_digi_remove(struct platform_device *pdev)
+{
+ return snd_soc_unregister_card(&snd_rpi_iqaudio_digi);
+}
+
+static const struct of_device_id snd_rpi_iqaudio_digi_of_match[] = {
+ { .compatible = "iqaudio,wm8804-digi", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, snd_rpi_iqaudio_digi_of_match);
+
+static struct platform_driver snd_rpi_iqaudio_digi_driver = {
+ .driver = {
+ .name = "IQAudIODigi",
+ .owner = THIS_MODULE,
+ .of_match_table = snd_rpi_iqaudio_digi_of_match,
+ },
+ .probe = snd_rpi_iqaudio_digi_probe,
+ .remove = snd_rpi_iqaudio_digi_remove,
+};
+
+module_platform_driver(snd_rpi_iqaudio_digi_driver);
+
+MODULE_AUTHOR("Daniel Matuschek <info@crazy-audio.com>");
+MODULE_DESCRIPTION("ASoC Driver for IQAudIO WM8804 Digi");
+MODULE_LICENSE("GPL v2");
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