From f3dc9ad69589abbf6572636fc2e2a120462a229a Mon Sep 17 00:00:00 2001
From: Tim Gover <tim.gover@raspberrypi.org>
Date: Wed, 27 Jun 2018 15:59:12 +0100
Subject: [PATCH] ASoC: Add generic RPI driver for simple soundcards.
The RPI simple sound card driver provides a generic ALSA SOC card driver
supporting a variety of Pi HAT soundcards. The intention is to avoid
the duplication of code for cards that can't be fully supported by
the soc simple/graph cards but are otherwise almost identical.
This initial commit adds support for the ADAU1977 ADC, Google VoiceHat,
HifiBerry AMP, HifiBerry DAC and RPI DAC.
Signed-off-by: Tim Gover <tim.gover@raspberrypi.org>
ASoC: Use correct card name in rpi-simple driver
Use the specific card name from drvdata instead of the snd_rpi_simple
rpi-simple-soundcard: Use nicer driver name "RPi-simple"
Rename the driver from "RPI simple soundcard" to "RPi-simple" so that
the driver name won't be mangled allowing to be used unaltered as the
card conf filename.
ASoC: rpi-simple-soundcard: use modern dai_link style
Signed-off-by: Hui Wang <hui.wang@canonical.com>
---
sound/soc/bcm/rpi-simple-soundcard.c | 288 +++++++++++++++++++++++++++
1 file changed, 288 insertions(+)
create mode 100644 sound/soc/bcm/rpi-simple-soundcard.c
--- /dev/null
+++ b/sound/soc/bcm/rpi-simple-soundcard.c
@@ -0,0 +1,288 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rpi-simple-soundcard.c -- ALSA SoC Raspberry Pi soundcard.
+ *
+ * Copyright (C) 2018 Raspberry Pi.
+ *
+ * Authors: Tim Gover <tim.gover@raspberrypi.org>
+ *
+ * Based on code:
+ * hifiberry_amp.c, hifiberry_dac.c, rpi-dac.c
+ * by Florian Meier <florian.meier@koalo.de>
+ *
+ * googlevoicehat-soundcard.c
+ * by Peter Malkin <petermalkin@google.com>
+ *
+ * adau1977-adc.c
+ * by Andrey Grodzovsky <andrey2805@gmail.com>
+ *
+ * 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>
+
+/* Parameters for generic RPI functions */
+struct snd_rpi_simple_drvdata {
+ struct snd_soc_dai_link *dai;
+ const char* card_name;
+ unsigned int fixed_bclk_ratio;
+};
+
+static int snd_rpi_simple_init(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_rpi_simple_drvdata *drvdata =
+ snd_soc_card_get_drvdata(rtd->card);
+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+
+ if (drvdata->fixed_bclk_ratio > 0)
+ return snd_soc_dai_set_bclk_ratio(cpu_dai,
+ drvdata->fixed_bclk_ratio);
+
+ return 0;
+}
+
+static int snd_rpi_simple_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;
+ struct snd_rpi_simple_drvdata *drvdata;
+ unsigned int sample_bits;
+
+ drvdata = snd_soc_card_get_drvdata(rtd->card);
+
+ if (drvdata->fixed_bclk_ratio > 0)
+ return 0; // BCLK is configured in .init
+
+ /* The simple drivers just set the bclk_ratio to sample_bits * 2 so
+ * hard-code this for now. More complex drivers could just replace
+ * the hw_params routine.
+ */
+ sample_bits = snd_pcm_format_physical_width(params_format(params));
+ return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
+}
+
+static struct snd_soc_ops snd_rpi_simple_ops = {
+ .hw_params = snd_rpi_simple_hw_params,
+};
+
+enum adau1977_clk_id {
+ ADAU1977_SYSCLK,
+};
+
+enum adau1977_sysclk_src {
+ ADAU1977_SYSCLK_SRC_MCLK,
+ ADAU1977_SYSCLK_SRC_LRCLK,
+};
+
+static int adau1977_init(struct snd_soc_pcm_runtime *rtd)
+{
+ int ret;
+ struct snd_soc_dai *codec_dai = rtd->codec_dai;
+
+ ret = snd_soc_dai_set_tdm_slot(codec_dai, 0, 0, 0, 0);
+ if (ret < 0)
+ return ret;
+
+ return snd_soc_component_set_sysclk(codec_dai->component,
+ ADAU1977_SYSCLK, ADAU1977_SYSCLK_SRC_MCLK,
+ 11289600, SND_SOC_CLOCK_IN);
+}
+
+SND_SOC_DAILINK_DEFS(adau1977,
+ DAILINK_COMP_ARRAY(COMP_EMPTY()),
+ DAILINK_COMP_ARRAY(COMP_CODEC("adau1977.1-0011", "adau1977-hifi")),
+ DAILINK_COMP_ARRAY(COMP_EMPTY()));
+
+static struct snd_soc_dai_link snd_rpi_adau1977_dai[] = {
+ {
+ .name = "adau1977",
+ .stream_name = "ADAU1977",
+ .init = adau1977_init,
+ .dai_fmt = SND_SOC_DAIFMT_I2S |
+ SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_CBM_CFM,
+ SND_SOC_DAILINK_REG(adau1977),
+ },
+};
+
+static struct snd_rpi_simple_drvdata drvdata_adau1977 = {
+ .card_name = "snd_rpi_adau1977_adc",
+ .dai = snd_rpi_adau1977_dai,
+};
+
+SND_SOC_DAILINK_DEFS(gvchat,
+ DAILINK_COMP_ARRAY(COMP_EMPTY()),
+ DAILINK_COMP_ARRAY(COMP_CODEC("voicehat-codec", "voicehat-hifi")),
+ DAILINK_COMP_ARRAY(COMP_EMPTY()));
+
+static struct snd_soc_dai_link snd_googlevoicehat_soundcard_dai[] = {
+{
+ .name = "Google voiceHAT SoundCard",
+ .stream_name = "Google voiceHAT SoundCard HiFi",
+ .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_CBS_CFS,
+ SND_SOC_DAILINK_REG(gvchat),
+},
+};
+
+static struct snd_rpi_simple_drvdata drvdata_googlevoicehat = {
+ .card_name = "snd_rpi_googlevoicehat_soundcard",
+ .dai = snd_googlevoicehat_soundcard_dai,
+};
+
+SND_SOC_DAILINK_DEFS(hifiberry_amp,
+ DAILINK_COMP_ARRAY(COMP_EMPTY()),
+ DAILINK_COMP_ARRAY(COMP_CODEC("tas5713.1-001b", "tas5713-hifi")),
+ DAILINK_COMP_ARRAY(COMP_EMPTY()));
+
+static struct snd_soc_dai_link snd_hifiberry_amp_dai[] = {
+ {
+ .name = "HifiBerry AMP",
+ .stream_name = "HifiBerry AMP HiFi",
+ .dai_fmt = SND_SOC_DAIFMT_I2S |
+ SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_CBS_CFS,
+ SND_SOC_DAILINK_REG(hifiberry_amp),
+ },
+};
+
+static struct snd_rpi_simple_drvdata drvdata_hifiberry_amp = {
+ .card_name = "snd_rpi_hifiberry_amp",
+ .dai = snd_hifiberry_amp_dai,
+ .fixed_bclk_ratio = 64,
+};
+
+SND_SOC_DAILINK_DEFS(hifiberry_dac,
+ DAILINK_COMP_ARRAY(COMP_EMPTY()),
+ DAILINK_COMP_ARRAY(COMP_CODEC("pcm5102a-codec", "pcm5102a-hifi")),
+ DAILINK_COMP_ARRAY(COMP_EMPTY()));
+
+static struct snd_soc_dai_link snd_hifiberry_dac_dai[] = {
+ {
+ .name = "HifiBerry DAC",
+ .stream_name = "HifiBerry DAC HiFi",
+ .dai_fmt = SND_SOC_DAIFMT_I2S |
+ SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_CBS_CFS,
+ SND_SOC_DAILINK_REG(hifiberry_dac),
+ },
+};
+
+static struct snd_rpi_simple_drvdata drvdata_hifiberry_dac = {
+ .card_name = "snd_rpi_hifiberry_dac",
+ .dai = snd_hifiberry_dac_dai,
+};
+
+SND_SOC_DAILINK_DEFS(rpi_dac,
+ DAILINK_COMP_ARRAY(COMP_EMPTY()),
+ DAILINK_COMP_ARRAY(COMP_CODEC("pcm1794a-codec", "pcm1794a-hifi")),
+ DAILINK_COMP_ARRAY(COMP_EMPTY()));
+
+static struct snd_soc_dai_link snd_rpi_dac_dai[] = {
+{
+ .name = "RPi-DAC",
+ .stream_name = "RPi-DAC HiFi",
+ .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_CBS_CFS,
+ SND_SOC_DAILINK_REG(rpi_dac),
+},
+};
+
+static struct snd_rpi_simple_drvdata drvdata_rpi_dac = {
+ .card_name = "snd_rpi_rpi_dac",
+ .dai = snd_rpi_dac_dai,
+ .fixed_bclk_ratio = 64,
+};
+
+static const struct of_device_id snd_rpi_simple_of_match[] = {
+ { .compatible = "adi,adau1977-adc",
+ .data = (void *) &drvdata_adau1977 },
+ { .compatible = "googlevoicehat,googlevoicehat-soundcard",
+ .data = (void *) &drvdata_googlevoicehat },
+ { .compatible = "hifiberry,hifiberry-amp",
+ .data = (void *) &drvdata_hifiberry_amp },
+ { .compatible = "hifiberry,hifiberry-dac",
+ .data = (void *) &drvdata_hifiberry_dac },
+ { .compatible = "rpi,rpi-dac", &drvdata_rpi_dac},
+ {},
+};
+
+static struct snd_soc_card snd_rpi_simple = {
+ .driver_name = "RPi-simple",
+ .owner = THIS_MODULE,
+ .dai_link = NULL,
+ .num_links = 1, /* Only a single DAI supported at the moment */
+};
+
+static int snd_rpi_simple_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ const struct of_device_id *of_id;
+
+ snd_rpi_simple.dev = &pdev->dev;
+ of_id = of_match_node(snd_rpi_simple_of_match, pdev->dev.of_node);
+
+ if (pdev->dev.of_node && of_id->data) {
+ struct device_node *i2s_node;
+ struct snd_rpi_simple_drvdata *drvdata =
+ (struct snd_rpi_simple_drvdata *) of_id->data;
+ struct snd_soc_dai_link *dai = drvdata->dai;
+
+ snd_soc_card_set_drvdata(&snd_rpi_simple, drvdata);
+
+ /* More complex drivers might override individual functions */
+ if (!dai->init)
+ dai->init = snd_rpi_simple_init;
+ if (!dai->ops)
+ dai->ops = &snd_rpi_simple_ops;
+
+ snd_rpi_simple.name = drvdata->card_name;
+
+ snd_rpi_simple.dai_link = dai;
+ i2s_node = of_parse_phandle(pdev->dev.of_node,
+ "i2s-controller", 0);
+ if (!i2s_node) {
+ pr_err("Failed to find i2s-controller DT node\n");
+ return -ENODEV;
+ }
+
+ dai->cpus->of_node = i2s_node;
+ dai->platforms->of_node = i2s_node;
+ }
+
+ ret = devm_snd_soc_register_card(&pdev->dev, &snd_rpi_simple);
+ if (ret && ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "Failed to register card %d\n", ret);
+
+ return ret;
+}
+
+static struct platform_driver snd_rpi_simple_driver = {
+ .driver = {
+ .name = "snd-rpi-simple",
+ .owner = THIS_MODULE,
+ .of_match_table = snd_rpi_simple_of_match,
+ },
+ .probe = snd_rpi_simple_probe,
+};
+MODULE_DEVICE_TABLE(of, snd_rpi_simple_of_match);
+
+module_platform_driver(snd_rpi_simple_driver);
+
+MODULE_AUTHOR("Tim Gover <tim.gover@raspberrypi.org>");
+MODULE_DESCRIPTION("ASoC Raspberry Pi simple soundcard driver ");
+MODULE_LICENSE("GPL v2");