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Add IQaudIO Sound Card support for Raspberry Pi

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Set a limit of 0dB on Digital Volume Control

The main volume control in the PCM512x DAC has a range up to
+24dB. This is dangerously loud and can potentially cause massive
clipping in the output stages. Therefore this sets a sensible
limit of 0dB for this control.
This commit is contained in:
Gordon Garrity
2014-03-08 16:56:57 +00:00
committed by popcornmix
parent abf850ecc3
commit af4228e36c
3 changed files with 126 additions and 0 deletions
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7
sound/soc/bcm/Kconfig
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@@ -28,3 +28,10 @@ config SND_BCM2708_SOC_RPI_DAC
select SND_SOC_PCM1794A
help
Say Y or M if you want to add support for RPi-DAC.
config SND_BCM2708_SOC_IQAUDIO_DAC
tristate "Support for IQaudIO-DAC"
depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
select SND_SOC_PCM512x_I2C
help
Say Y or M if you want to add support for IQaudIO-DAC.

2
sound/soc/bcm/Makefile
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@@ -7,7 +7,9 @@ obj-$(CONFIG_SND_BCM2835_SOC_I2S) += snd-soc-bcm2835-i2s.o
snd-soc-hifiberry-dac-objs := hifiberry_dac.o
snd-soc-hifiberry-digi-objs := hifiberry_digi.o
snd-soc-rpi-dac-objs := rpi-dac.o
snd-soc-iqaudio-dac-objs := iqaudio-dac.o
obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI) += snd-soc-hifiberry-digi.o
obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) += snd-soc-iqaudio-dac.o

117
sound/soc/bcm/iqaudio-dac.c Normal file
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@@ -0,0 +1,117 @@
/*
* ASoC Driver for IQaudIO 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_iqaudio_dac_init(struct snd_soc_pcm_runtime *rtd)
{
int ret;
struct snd_soc_card *card = rtd->card;
struct snd_soc_codec *codec = rtd->codec;
ret = snd_soc_limit_volume(codec, "Digital Playback Volume", 207);
if (ret < 0)
dev_warn(card->dev, "Failed to set volume limit: %d\n", ret);
return 0;
}
static int snd_rpi_iqaudio_dac_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
// NOT USED struct snd_soc_dai *codec_dai = rtd->codec_dai;
// NOT USED struct snd_soc_codec *codec = rtd->codec;
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_iqaudio_dac_ops = {
.hw_params = snd_rpi_iqaudio_dac_hw_params,
};
static struct snd_soc_dai_link snd_rpi_iqaudio_dac_dai[] = {
{
.name = "IQaudIO DAC",
.stream_name = "IQaudIO DAC HiFi",
.cpu_dai_name = "bcm2708-i2s.0",
.codec_dai_name = "pcm512x-hifi",
.platform_name = "bcm2708-i2s.0",
.codec_name = "pcm512x.1-004c",
.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBS_CFS,
.ops = &snd_rpi_iqaudio_dac_ops,
.init = snd_rpi_iqaudio_dac_init,
},
};
/* audio machine driver */
static struct snd_soc_card snd_rpi_iqaudio_dac = {
.name = "IQaudIODAC",
.dai_link = snd_rpi_iqaudio_dac_dai,
.num_links = ARRAY_SIZE(snd_rpi_iqaudio_dac_dai),
};
static int snd_rpi_iqaudio_dac_probe(struct platform_device *pdev)
{
int ret = 0;
snd_rpi_iqaudio_dac.dev = &pdev->dev;
ret = snd_soc_register_card(&snd_rpi_iqaudio_dac);
if (ret)
dev_err(&pdev->dev,
"snd_soc_register_card() failed: %d\n", ret);
return ret;
}
static int snd_rpi_iqaudio_dac_remove(struct platform_device *pdev)
{
return snd_soc_unregister_card(&snd_rpi_iqaudio_dac);
}
static const struct of_device_id iqaudio_of_match[] = {
{ .compatible = "iqaudio,iqaudio-dac", },
{},
};
static struct platform_driver snd_rpi_iqaudio_dac_driver = {
.driver = {
.name = "snd-rpi-iqaudio-dac",
.owner = THIS_MODULE,
.of_match_table = iqaudio_of_match,
},
.probe = snd_rpi_iqaudio_dac_probe,
.remove = snd_rpi_iqaudio_dac_remove,
};
module_platform_driver(snd_rpi_iqaudio_dac_driver);
MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
MODULE_DESCRIPTION("ASoC Driver for IQAudio DAC");
MODULE_LICENSE("GPL v2");