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// SPDX-License-Identifier: GPL-2.0
/*
* ASoC Driver for HiFiBerry DAC+ HD
*
* Author: Joerg Schambacher, i2Audio GmbH for HiFiBerry
* Copyright 2020
*
* 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 <linux/kernel.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <linux/i2c.h>
#include <linux/clk.h>
#include "../codecs/pcm179x.h"
#define DEFAULT_RATE 44100
struct brd_drv_data {
struct regmap *regmap;
struct clk *sclk;
};
static struct brd_drv_data drvdata;
static struct gpio_desc *reset_gpio;
static const unsigned int hb_dacplushd_rates[] = {
192000, 96000, 48000, 176400, 88200, 44100,
};
static struct snd_pcm_hw_constraint_list hb_dacplushd_constraints = {
.list = hb_dacplushd_rates,
.count = ARRAY_SIZE(hb_dacplushd_rates),
};
static int snd_rpi_hb_dacplushd_startup(struct snd_pcm_substream *substream)
{
/* constraints for standard sample rates */
snd_pcm_hw_constraint_list(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
&hb_dacplushd_constraints);
return 0;
}
static void snd_rpi_hifiberry_dacplushd_set_sclk(
struct snd_soc_component *component,
int sample_rate)
{
if (!IS_ERR(drvdata.sclk))
clk_set_rate(drvdata.sclk, sample_rate);
}
static int snd_rpi_hifiberry_dacplushd_init(struct snd_soc_pcm_runtime *rtd)
{
struct snd_soc_dai_link *dai = rtd->dai_link;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
dai->name = "HiFiBerry DAC+ HD";
dai->stream_name = "HiFiBerry DAC+ HD HiFi";
dai->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
| SND_SOC_DAIFMT_CBM_CFM;
/* allow only fixed 32 clock counts per channel */
snd_soc_dai_set_bclk_ratio(cpu_dai, 32*2);
return 0;
}
static int snd_rpi_hifiberry_dacplushd_hw_params(
struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
{
int ret = 0;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_component *component = asoc_rtd_to_codec(rtd, 0)->component;
snd_rpi_hifiberry_dacplushd_set_sclk(component, params_rate(params));
return ret;
}
/* machine stream operations */
static struct snd_soc_ops snd_rpi_hifiberry_dacplushd_ops = {
.startup = snd_rpi_hb_dacplushd_startup,
.hw_params = snd_rpi_hifiberry_dacplushd_hw_params,
};
SND_SOC_DAILINK_DEFS(hifi,
DAILINK_COMP_ARRAY(COMP_CPU("bcm2708-i2s.0")),
DAILINK_COMP_ARRAY(COMP_CODEC("pcm179x.1-004c", "pcm179x-hifi")),
DAILINK_COMP_ARRAY(COMP_PLATFORM("bcm2708-i2s.0")));
static struct snd_soc_dai_link snd_rpi_hifiberry_dacplushd_dai[] = {
{
.name = "HiFiBerry DAC+ HD",
.stream_name = "HiFiBerry DAC+ HD HiFi",
.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBS_CFS,
.ops = &snd_rpi_hifiberry_dacplushd_ops,
.init = snd_rpi_hifiberry_dacplushd_init,
SND_SOC_DAILINK_REG(hifi),
},
};
/* audio machine driver */
static struct snd_soc_card snd_rpi_hifiberry_dacplushd = {
.name = "snd_rpi_hifiberry_dacplushd",
.driver_name = "HifiberryDacplusHD",
.owner = THIS_MODULE,
.dai_link = snd_rpi_hifiberry_dacplushd_dai,
.num_links = ARRAY_SIZE(snd_rpi_hifiberry_dacplushd_dai),
};
static int snd_rpi_hifiberry_dacplushd_probe(struct platform_device *pdev)
{
int ret = 0;
static int dac_reset_done;
struct device *dev = &pdev->dev;
struct device_node *dev_node = dev->of_node;
snd_rpi_hifiberry_dacplushd.dev = &pdev->dev;
/* get GPIO and release DAC from RESET */
if (!dac_reset_done) {
reset_gpio = gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(reset_gpio)) {
dev_err(&pdev->dev, "gpiod_get() failed\n");
return -EINVAL;
}
dac_reset_done = 1;
}
if (!IS_ERR(reset_gpio))
gpiod_set_value(reset_gpio, 0);
msleep(1);
if (!IS_ERR(reset_gpio))
gpiod_set_value(reset_gpio, 1);
msleep(1);
if (!IS_ERR(reset_gpio))
gpiod_set_value(reset_gpio, 0);
if (pdev->dev.of_node) {
struct device_node *i2s_node;
struct snd_soc_dai_link *dai;
dai = &snd_rpi_hifiberry_dacplushd_dai[0];
i2s_node = of_parse_phandle(pdev->dev.of_node,
"i2s-controller", 0);
if (i2s_node) {
dai->cpus->of_node = i2s_node;
dai->platforms->of_node = i2s_node;
dai->cpus->dai_name = NULL;
dai->platforms->name = NULL;
} else {
return -EPROBE_DEFER;
}
}
ret = devm_snd_soc_register_card(&pdev->dev,
&snd_rpi_hifiberry_dacplushd);
if (ret && ret != -EPROBE_DEFER) {
dev_err(&pdev->dev,
"snd_soc_register_card() failed: %d\n", ret);
return ret;
}
if (ret == -EPROBE_DEFER)
return ret;
dev_set_drvdata(dev, &drvdata);
if (dev_node == NULL) {
dev_err(&pdev->dev, "Device tree node not found\n");
return -ENODEV;
}
drvdata.sclk = devm_clk_get(dev, NULL);
if (IS_ERR(drvdata.sclk)) {
drvdata.sclk = ERR_PTR(-ENOENT);
return -ENODEV;
}
clk_set_rate(drvdata.sclk, DEFAULT_RATE);
return ret;
}
static int snd_rpi_hifiberry_dacplushd_remove(struct platform_device *pdev)
{
if (IS_ERR(reset_gpio))
return -EINVAL;
/* put DAC into RESET and release GPIO */
gpiod_set_value(reset_gpio, 0);
gpiod_put(reset_gpio);
return 0;
}
static const struct of_device_id snd_rpi_hifiberry_dacplushd_of_match[] = {
{ .compatible = "hifiberry,hifiberry-dacplushd", },
{},
};
MODULE_DEVICE_TABLE(of, snd_rpi_hifiberry_dacplushd_of_match);
static struct platform_driver snd_rpi_hifiberry_dacplushd_driver = {
.driver = {
.name = "snd-rpi-hifiberry-dacplushd",
.owner = THIS_MODULE,
.of_match_table = snd_rpi_hifiberry_dacplushd_of_match,
},
.probe = snd_rpi_hifiberry_dacplushd_probe,
.remove = snd_rpi_hifiberry_dacplushd_remove,
};
module_platform_driver(snd_rpi_hifiberry_dacplushd_driver);
MODULE_AUTHOR("Joerg Schambacher <joerg@i2audio.com>");
MODULE_DESCRIPTION("ASoC Driver for HiFiBerry DAC+ HD");
MODULE_LICENSE("GPL v2");
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