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- From 77afe84c37210adb241e9b48f1a415f49f183a68 Mon Sep 17 00:00:00 2001
- From: Florian Meier <florian.meier@koalo.de>
- Date: Fri, 22 Nov 2013 19:19:08 +0100
- Subject: [PATCH 033/114] ASoC: Add support for HifiBerry DAC
- This adds a machine driver for the HifiBerry DAC.
- It is a sound card that can
- be stacked onto the Raspberry Pi.
- Signed-off-by: Florian Meier <florian.meier@koalo.de>
- ---
- sound/soc/bcm/Kconfig | 7 +++
- sound/soc/bcm/Makefile | 5 +++
- sound/soc/bcm/hifiberry_dac.c | 100 ++++++++++++++++++++++++++++++++++++++++++
- 3 files changed, 112 insertions(+)
- create mode 100644 sound/soc/bcm/hifiberry_dac.c
- --- a/sound/soc/bcm/Kconfig
- +++ b/sound/soc/bcm/Kconfig
- @@ -18,3 +18,10 @@ config SND_BCM2708_SOC_I2S
- Say Y or M if you want to add support for codecs attached to
- the BCM2708 I2S interface. You will also need
- to select the audio interfaces to support below.
- +
- +config SND_BCM2708_SOC_HIFIBERRY_DAC
- + tristate "Support for HifiBerry DAC"
- + depends on SND_BCM2708_SOC_I2S
- + select SND_SOC_PCM5102A
- + help
- + Say Y or M if you want to add support for HifiBerry DAC.
- --- a/sound/soc/bcm/Makefile
- +++ b/sound/soc/bcm/Makefile
- @@ -7,3 +7,8 @@ obj-$(CONFIG_SND_BCM2835_SOC_I2S) += snd
- snd-soc-bcm2708-i2s-objs := bcm2708-i2s.o
-
- obj-$(CONFIG_SND_BCM2708_SOC_I2S) += snd-soc-bcm2708-i2s.o
- +
- +# BCM2708 Machine Support
- +snd-soc-hifiberry-dac-objs := hifiberry_dac.o
- +
- +obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
- --- /dev/null
- +++ b/sound/soc/bcm/hifiberry_dac.c
- @@ -0,0 +1,100 @@
- +/*
- + * ASoC Driver for HifiBerry DAC
- + *
- + * Author: 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>
- +
- +static int snd_rpi_hifiberry_dac_init(struct snd_soc_pcm_runtime *rtd)
- +{
- + return 0;
- +}
- +
- +static int snd_rpi_hifiberry_dac_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;
- +
- + unsigned int sample_bits =
- + snd_pcm_format_physical_width(params_format(params));
- +
- + return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
- +}
- +
- +/* machine stream operations */
- +static struct snd_soc_ops snd_rpi_hifiberry_dac_ops = {
- + .hw_params = snd_rpi_hifiberry_dac_hw_params,
- +};
- +
- +static struct snd_soc_dai_link snd_rpi_hifiberry_dac_dai[] = {
- +{
- + .name = "HifiBerry DAC",
- + .stream_name = "HifiBerry DAC HiFi",
- + .cpu_dai_name = "bcm2708-i2s.0",
- + .codec_dai_name = "pcm5102a-hifi",
- + .platform_name = "bcm2708-i2s.0",
- + .codec_name = "pcm5102a-codec",
- + .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
- + SND_SOC_DAIFMT_CBS_CFS,
- + .ops = &snd_rpi_hifiberry_dac_ops,
- + .init = snd_rpi_hifiberry_dac_init,
- +},
- +};
- +
- +/* audio machine driver */
- +static struct snd_soc_card snd_rpi_hifiberry_dac = {
- + .name = "snd_rpi_hifiberry_dac",
- + .dai_link = snd_rpi_hifiberry_dac_dai,
- + .num_links = ARRAY_SIZE(snd_rpi_hifiberry_dac_dai),
- +};
- +
- +static int snd_rpi_hifiberry_dac_probe(struct platform_device *pdev)
- +{
- + int ret = 0;
- +
- + snd_rpi_hifiberry_dac.dev = &pdev->dev;
- + ret = snd_soc_register_card(&snd_rpi_hifiberry_dac);
- + if (ret)
- + dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
- +
- + return ret;
- +}
- +
- +static int snd_rpi_hifiberry_dac_remove(struct platform_device *pdev)
- +{
- + return snd_soc_unregister_card(&snd_rpi_hifiberry_dac);
- +}
- +
- +static struct platform_driver snd_rpi_hifiberry_dac_driver = {
- + .driver = {
- + .name = "snd-hifiberry-dac",
- + .owner = THIS_MODULE,
- + },
- + .probe = snd_rpi_hifiberry_dac_probe,
- + .remove = snd_rpi_hifiberry_dac_remove,
- +};
- +
- +module_platform_driver(snd_rpi_hifiberry_dac_driver);
- +
- +MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
- +MODULE_DESCRIPTION("ASoC Driver for HifiBerry DAC");
- +MODULE_LICENSE("GPL v2");
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