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/*
* ALSA ASoC Machine Driver for Allo Piano DAC
*
* Author: Baswaraj K <jaikumar@cem-solutions.net>
* Copyright 2016
* based on code by Daniel Matuschek <info@crazy-audio.com>
* based on code by Florian Meier <florian.meier@koalo.de>
*
* 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>
static bool digital_gain_0db_limit = true;
static int snd_allo_piano_dac_init(struct snd_soc_pcm_runtime *rtd)
{
if (digital_gain_0db_limit) {
int ret;
struct snd_soc_card *card = rtd->card;
ret = snd_soc_limit_volume(card, "Digital Playback Volume",
207);
if (ret < 0)
dev_warn(card->dev, "Failed to set volume limit: %d\n",
ret);
}
return 0;
}
SND_SOC_DAILINK_DEFS(allo_piano_dai,
DAILINK_COMP_ARRAY(COMP_CPU("bcm2708-i2s.0")),
DAILINK_COMP_ARRAY(COMP_CODEC("pcm512x.1-004c", "pcm512x-hifi")),
DAILINK_COMP_ARRAY(COMP_PLATFORM("bcm2708-i2s.0")));
static struct snd_soc_dai_link snd_allo_piano_dac_dai[] = {
{
.name = "Piano DAC",
.stream_name = "Piano DAC HiFi",
.dai_fmt = SND_SOC_DAIFMT_I2S |
SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBS_CFS,
.init = snd_allo_piano_dac_init,
SND_SOC_DAILINK_REG(allo_piano_dai),
},
};
/* audio machine driver */
static struct snd_soc_card snd_allo_piano_dac = {
.name = "PianoDAC",
.owner = THIS_MODULE,
.dai_link = snd_allo_piano_dac_dai,
.num_links = ARRAY_SIZE(snd_allo_piano_dac_dai),
};
static int snd_allo_piano_dac_probe(struct platform_device *pdev)
{
int ret = 0;
snd_allo_piano_dac.dev = &pdev->dev;
if (pdev->dev.of_node) {
struct device_node *i2s_node;
struct snd_soc_dai_link *dai;
dai = &snd_allo_piano_dac_dai[0];
i2s_node = of_parse_phandle(pdev->dev.of_node,
"i2s-controller", 0);
if (i2s_node) {
dai->cpus->dai_name = NULL;
dai->cpus->of_node = i2s_node;
dai->platforms->name = NULL;
dai->platforms->of_node = i2s_node;
}
digital_gain_0db_limit = !of_property_read_bool(
pdev->dev.of_node, "allo,24db_digital_gain");
}
ret = devm_snd_soc_register_card(&pdev->dev, &snd_allo_piano_dac);
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_allo_piano_dac_of_match[] = {
{ .compatible = "allo,piano-dac", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, snd_allo_piano_dac_of_match);
static struct platform_driver snd_allo_piano_dac_driver = {
.driver = {
.name = "snd-allo-piano-dac",
.owner = THIS_MODULE,
.of_match_table = snd_allo_piano_dac_of_match,
},
.probe = snd_allo_piano_dac_probe,
};
module_platform_driver(snd_allo_piano_dac_driver);
MODULE_AUTHOR("Baswaraj K <jaikumar@cem-solutions.net>");
MODULE_DESCRIPTION("ALSA ASoC Machine Driver for Allo Piano DAC");
MODULE_LICENSE("GPL v2");
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