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From 8ed265197d7a8f9c1a328d262bfe91050716ad76 Mon Sep 17 00:00:00 2001
From: Fe-Pi <fe-pi@cox.net>
Date: Wed, 1 Mar 2017 04:42:43 -0700
Subject: [PATCH] Add support for Fe-Pi audio sound card. (#1867)
Fe-Pi Audio Sound Card is based on NXP SGTL5000 codec.
Mechanical specification of the board is the same the Raspberry Pi Zero.
3.5mm jacks for Headphone/Mic, Line In, and Line Out.
Signed-off-by: Henry Kupis <fe-pi@cox.net>
---
sound/soc/bcm/fe-pi-audio.c | 152 ++++++++++++++++++++++++++++++++++++
1 file changed, 152 insertions(+)
create mode 100644 sound/soc/bcm/fe-pi-audio.c
--- /dev/null
+++ b/sound/soc/bcm/fe-pi-audio.c
@@ -0,0 +1,152 @@
+/*
+ * ASoC Driver for Fe-Pi Audio Sound Card
+ *
+ * Author: Henry Kupis <kuupaz@gmail.com>
+ * Copyright 2016
+ * based on code by Florian Meier <florian.meier@koalo.de>
+ * based on code by Shawn Guo <shawn.guo@linaro.org>
+ *
+ * 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 <linux/io.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+
+#include "../codecs/sgtl5000.h"
+
+static int snd_fe_pi_audio_init(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_soc_card *card = rtd->card;
+ struct snd_soc_component *component = rtd->codec_dai->component;
+
+ snd_soc_dapm_force_enable_pin(&card->dapm, "LO");
+ snd_soc_dapm_force_enable_pin(&card->dapm, "ADC");
+ snd_soc_dapm_force_enable_pin(&card->dapm, "DAC");
+ snd_soc_dapm_force_enable_pin(&card->dapm, "HP");
+ snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_POWER,
+ SGTL5000_VAG_POWERUP, SGTL5000_VAG_POWERUP);
+
+ return 0;
+}
+
+static int snd_fe_pi_audio_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct device *dev = rtd->card->dev;
+ struct snd_soc_dai *codec_dai = rtd->codec_dai;
+
+ int ret;
+
+ /* Set SGTL5000's SYSCLK */
+ ret = snd_soc_dai_set_sysclk(codec_dai, SGTL5000_SYSCLK, 12288000, SND_SOC_CLOCK_IN);
+ if (ret) {
+ dev_err(dev, "could not set codec driver clock params\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+
+static struct snd_soc_ops snd_fe_pi_audio_ops = {
+ .hw_params = snd_fe_pi_audio_hw_params,
+};
+
+static struct snd_soc_dai_link snd_fe_pi_audio_dai[] = {
+ {
+ .name = "FE-PI",
+ .stream_name = "Fe-Pi HiFi",
+ .cpu_dai_name = "bcm2708-i2s.0",
+ .codec_dai_name = "sgtl5000",
+ .platform_name = "bcm2708-i2s.0",
+ .codec_name = "sgtl5000.1-000a",
+ .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_CBM_CFM,
+ .ops = &snd_fe_pi_audio_ops,
+ .init = snd_fe_pi_audio_init,
+ },
+};
+
+static const struct snd_soc_dapm_route fe_pi_audio_dapm_routes[] = {
+ {"ADC", NULL, "Mic Bias"},
+};
+
+
+static struct snd_soc_card fe_pi_audio = {
+ .name = "Fe-Pi Audio",
+ .owner = THIS_MODULE,
+ .dai_link = snd_fe_pi_audio_dai,
+ .num_links = ARRAY_SIZE(snd_fe_pi_audio_dai),
+
+ .dapm_routes = fe_pi_audio_dapm_routes,
+ .num_dapm_routes = ARRAY_SIZE(fe_pi_audio_dapm_routes),
+};
+
+static int snd_fe_pi_audio_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ struct snd_soc_card *card = &fe_pi_audio;
+ struct device_node *np = pdev->dev.of_node;
+ struct device_node *i2s_node;
+ struct snd_soc_dai_link *dai = &snd_fe_pi_audio_dai[0];
+
+ fe_pi_audio.dev = &pdev->dev;
+
+ i2s_node = of_parse_phandle(np, "i2s-controller", 0);
+ if (!i2s_node) {
+ dev_err(&pdev->dev, "i2s_node phandle missing or invalid\n");
+ return -EINVAL;
+ }
+
+ dai->cpu_dai_name = NULL;
+ dai->cpu_of_node = i2s_node;
+ dai->platform_name = NULL;
+ dai->platform_of_node = i2s_node;
+
+ of_node_put(i2s_node);
+
+ card->dev = &pdev->dev;
+ platform_set_drvdata(pdev, card);
+
+ ret = devm_snd_soc_register_card(&pdev->dev, card);
+ 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_fe_pi_audio_of_match[] = {
+ { .compatible = "fe-pi,fe-pi-audio", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, snd_fe_pi_audio_of_match);
+
+static struct platform_driver snd_fe_pi_audio_driver = {
+ .driver = {
+ .name = "snd-fe-pi-audio",
+ .owner = THIS_MODULE,
+ .of_match_table = snd_fe_pi_audio_of_match,
+ },
+ .probe = snd_fe_pi_audio_probe,
+};
+
+module_platform_driver(snd_fe_pi_audio_driver);
+
+MODULE_AUTHOR("Henry Kupis <fe-pi@cox.net>");
+MODULE_DESCRIPTION("ASoC Driver for Fe-Pi Audio");
+MODULE_LICENSE("GPL v2");
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