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171 lines
5.2 KiB
Diff
171 lines
5.2 KiB
Diff
From fe9fdf49ba81e28860e5367ea8bb9c6b1c6a0460 Mon Sep 17 00:00:00 2001
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From: Florian Meier <florian.meier@koalo.de>
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Date: Fri, 22 Nov 2013 19:19:08 +0100
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Subject: [PATCH] ASoC: Add support for HifiBerry DAC
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This adds a machine driver for the HifiBerry DAC.
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It is a sound card that can
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be stacked onto the Raspberry Pi.
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Signed-off-by: Florian Meier <florian.meier@koalo.de>
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---
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sound/soc/bcm/Kconfig | 9 ++-
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sound/soc/bcm/Makefile | 4 ++
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sound/soc/bcm/hifiberry_dac.c | 124 ++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 136 insertions(+), 1 deletion(-)
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create mode 100644 sound/soc/bcm/hifiberry_dac.c
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--- a/sound/soc/bcm/Kconfig
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+++ b/sound/soc/bcm/Kconfig
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@@ -15,4 +15,11 @@ config SND_SOC_CYGNUS
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Say Y if you want to add support for ASoC audio on Broadcom
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Cygnus chips (bcm958300, bcm958305, bcm911360)
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- If you don't know what to do here, say N.
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\ No newline at end of file
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+ If you don't know what to do here, say N.
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+
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+config SND_BCM2708_SOC_HIFIBERRY_DAC
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+ tristate "Support for HifiBerry DAC"
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+ depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
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+ select SND_SOC_PCM5102A
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+ help
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+ Say Y or M if you want to add support for HifiBerry DAC.
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--- a/sound/soc/bcm/Makefile
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+++ b/sound/soc/bcm/Makefile
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@@ -8,3 +8,7 @@ snd-soc-cygnus-objs := cygnus-pcm.o cygn
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obj-$(CONFIG_SND_SOC_CYGNUS) += snd-soc-cygnus.o
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+# BCM2708 Machine Support
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+snd-soc-hifiberry-dac-objs := hifiberry_dac.o
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+
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+obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
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--- /dev/null
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+++ b/sound/soc/bcm/hifiberry_dac.c
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@@ -0,0 +1,124 @@
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+/*
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+ * ASoC Driver for HifiBerry DAC
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+ *
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+ * Author: Florian Meier <florian.meier@koalo.de>
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+ * Copyright 2013
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+
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+#include <sound/core.h>
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+#include <sound/pcm.h>
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+#include <sound/pcm_params.h>
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+#include <sound/soc.h>
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+#include <sound/jack.h>
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+
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+static int snd_rpi_hifiberry_dac_init(struct snd_soc_pcm_runtime *rtd)
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+{
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+ return 0;
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+}
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+
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+static int snd_rpi_hifiberry_dac_hw_params(struct snd_pcm_substream *substream,
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+ struct snd_pcm_hw_params *params)
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+{
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+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
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+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
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+
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+ unsigned int sample_bits =
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+ snd_pcm_format_physical_width(params_format(params));
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+
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+ return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
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+}
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+
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+/* machine stream operations */
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+static struct snd_soc_ops snd_rpi_hifiberry_dac_ops = {
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+ .hw_params = snd_rpi_hifiberry_dac_hw_params,
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+};
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+
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+static struct snd_soc_dai_link snd_rpi_hifiberry_dac_dai[] = {
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+{
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+ .name = "HifiBerry DAC",
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+ .stream_name = "HifiBerry DAC HiFi",
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+ .cpu_dai_name = "bcm2708-i2s.0",
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+ .codec_dai_name = "pcm5102a-hifi",
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+ .platform_name = "bcm2708-i2s.0",
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+ .codec_name = "pcm5102a-codec",
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+ .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
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+ SND_SOC_DAIFMT_CBS_CFS,
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+ .ops = &snd_rpi_hifiberry_dac_ops,
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+ .init = snd_rpi_hifiberry_dac_init,
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+},
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+};
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+
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+/* audio machine driver */
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+static struct snd_soc_card snd_rpi_hifiberry_dac = {
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+ .name = "snd_rpi_hifiberry_dac",
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+ .driver_name = "HifiberryDac",
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+ .owner = THIS_MODULE,
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+ .dai_link = snd_rpi_hifiberry_dac_dai,
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+ .num_links = ARRAY_SIZE(snd_rpi_hifiberry_dac_dai),
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+};
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+
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+static int snd_rpi_hifiberry_dac_probe(struct platform_device *pdev)
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+{
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+ int ret = 0;
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+
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+ snd_rpi_hifiberry_dac.dev = &pdev->dev;
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+
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+ if (pdev->dev.of_node) {
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+ struct device_node *i2s_node;
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+ struct snd_soc_dai_link *dai = &snd_rpi_hifiberry_dac_dai[0];
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+ i2s_node = of_parse_phandle(pdev->dev.of_node,
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+ "i2s-controller", 0);
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+
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+ if (i2s_node) {
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+ dai->cpu_dai_name = NULL;
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+ dai->cpu_of_node = i2s_node;
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+ dai->platform_name = NULL;
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+ dai->platform_of_node = i2s_node;
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+ }
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+ }
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+
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+ ret = snd_soc_register_card(&snd_rpi_hifiberry_dac);
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+ if (ret)
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+ dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
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+
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+ return ret;
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+}
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+
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+static int snd_rpi_hifiberry_dac_remove(struct platform_device *pdev)
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+{
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+ return snd_soc_unregister_card(&snd_rpi_hifiberry_dac);
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+}
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+
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+static const struct of_device_id snd_rpi_hifiberry_dac_of_match[] = {
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+ { .compatible = "hifiberry,hifiberry-dac", },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, snd_rpi_hifiberry_dac_of_match);
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+
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+static struct platform_driver snd_rpi_hifiberry_dac_driver = {
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+ .driver = {
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+ .name = "snd-hifiberry-dac",
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+ .owner = THIS_MODULE,
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+ .of_match_table = snd_rpi_hifiberry_dac_of_match,
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+ },
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+ .probe = snd_rpi_hifiberry_dac_probe,
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+ .remove = snd_rpi_hifiberry_dac_remove,
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+};
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+
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+module_platform_driver(snd_rpi_hifiberry_dac_driver);
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+
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+MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
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+MODULE_DESCRIPTION("ASoC Driver for HifiBerry DAC");
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+MODULE_LICENSE("GPL v2");
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