Staging
v0.7.0
v0.7.0
https://github.com/torvalds/linux
Tip revision: 2dde18cd1d8fac735875f2e4987f11817cc0bc2c authored by Linus Torvalds on 27 August 2023, 21:49:51 UTC
Linux 6.5
Linux 6.5
Tip revision: 2dde18c
snow.c
// SPDX-License-Identifier: GPL-2.0
//
// ASoC machine driver for Snow boards
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include "i2s.h"
#define FIN_PLL_RATE 24000000
SND_SOC_DAILINK_DEFS(links,
DAILINK_COMP_ARRAY(COMP_EMPTY()),
DAILINK_COMP_ARRAY(COMP_EMPTY()),
DAILINK_COMP_ARRAY(COMP_EMPTY()));
struct snow_priv {
struct snd_soc_dai_link dai_link;
struct clk *clk_i2s_bus;
};
static int snow_card_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
static const unsigned int pll_rate[] = {
73728000U, 67737602U, 49152000U, 45158401U, 32768001U
};
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
struct snow_priv *priv = snd_soc_card_get_drvdata(rtd->card);
int bfs, psr, rfs, bitwidth;
unsigned long int rclk;
long int freq = -EINVAL;
int ret, i;
bitwidth = snd_pcm_format_width(params_format(params));
if (bitwidth < 0) {
dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth);
return bitwidth;
}
if (bitwidth != 16 && bitwidth != 24) {
dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth);
return -EINVAL;
}
bfs = 2 * bitwidth;
switch (params_rate(params)) {
case 16000:
case 22050:
case 24000:
case 32000:
case 44100:
case 48000:
case 88200:
case 96000:
rfs = 8 * bfs;
break;
case 64000:
rfs = 384;
break;
case 8000:
case 11025:
case 12000:
rfs = 16 * bfs;
break;
default:
return -EINVAL;
}
rclk = params_rate(params) * rfs;
for (psr = 8; psr > 0; psr /= 2) {
for (i = 0; i < ARRAY_SIZE(pll_rate); i++) {
if ((pll_rate[i] - rclk * psr) <= 2) {
freq = pll_rate[i];
break;
}
}
}
if (freq < 0) {
dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk);
return -EINVAL;
}
ret = clk_set_rate(priv->clk_i2s_bus, freq);
if (ret < 0) {
dev_err(rtd->card->dev, "I2S bus clock rate set failed\n");
return ret;
}
return 0;
}
static const struct snd_soc_ops snow_card_ops = {
.hw_params = snow_card_hw_params,
};
static int snow_late_probe(struct snd_soc_card *card)
{
struct snd_soc_pcm_runtime *rtd;
struct snd_soc_dai *codec_dai;
rtd = snd_soc_get_pcm_runtime(card, &card->dai_link[0]);
/* In the multi-codec case codec_dais 0 is MAX98095 and 1 is HDMI. */
codec_dai = asoc_rtd_to_codec(rtd, 0);
/* Set the MCLK rate for the codec */
return snd_soc_dai_set_sysclk(codec_dai, 0,
FIN_PLL_RATE, SND_SOC_CLOCK_IN);
}
static struct snd_soc_card snow_snd = {
.name = "Snow-I2S",
.owner = THIS_MODULE,
.late_probe = snow_late_probe,
};
static int snow_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct snd_soc_card *card = &snow_snd;
struct device_node *cpu, *codec;
struct snd_soc_dai_link *link;
struct snow_priv *priv;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
link = &priv->dai_link;
link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBS_CFS;
link->name = "Primary";
link->stream_name = link->name;
link->cpus = links_cpus;
link->num_cpus = ARRAY_SIZE(links_cpus);
link->codecs = links_codecs;
link->num_codecs = ARRAY_SIZE(links_codecs);
link->platforms = links_platforms;
link->num_platforms = ARRAY_SIZE(links_platforms);
card->dai_link = link;
card->num_links = 1;
card->dev = dev;
/* Try new DT bindings with HDMI support first. */
cpu = of_get_child_by_name(dev->of_node, "cpu");
if (cpu) {
link->ops = &snow_card_ops;
link->cpus->of_node = of_parse_phandle(cpu, "sound-dai", 0);
of_node_put(cpu);
if (!link->cpus->of_node) {
dev_err(dev, "Failed parsing cpu/sound-dai property\n");
return -EINVAL;
}
codec = of_get_child_by_name(dev->of_node, "codec");
ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
of_node_put(codec);
if (ret < 0) {
of_node_put(link->cpus->of_node);
dev_err(dev, "Failed parsing codec node\n");
return ret;
}
priv->clk_i2s_bus = of_clk_get_by_name(link->cpus->of_node,
"i2s_opclk0");
if (IS_ERR(priv->clk_i2s_bus)) {
snd_soc_of_put_dai_link_codecs(link);
of_node_put(link->cpus->of_node);
return PTR_ERR(priv->clk_i2s_bus);
}
} else {
link->codecs->dai_name = "HiFi";
link->cpus->of_node = of_parse_phandle(dev->of_node,
"samsung,i2s-controller", 0);
if (!link->cpus->of_node) {
dev_err(dev, "i2s-controller property parse error\n");
return -EINVAL;
}
link->codecs->of_node = of_parse_phandle(dev->of_node,
"samsung,audio-codec", 0);
if (!link->codecs->of_node) {
of_node_put(link->cpus->of_node);
dev_err(dev, "audio-codec property parse error\n");
return -EINVAL;
}
}
link->platforms->of_node = link->cpus->of_node;
/* Update card-name if provided through DT, else use default name */
snd_soc_of_parse_card_name(card, "samsung,model");
snd_soc_card_set_drvdata(card, priv);
ret = devm_snd_soc_register_card(dev, card);
if (ret)
return dev_err_probe(&pdev->dev, ret,
"snd_soc_register_card failed\n");
return 0;
}
static void snow_remove(struct platform_device *pdev)
{
struct snow_priv *priv = platform_get_drvdata(pdev);
struct snd_soc_dai_link *link = &priv->dai_link;
of_node_put(link->cpus->of_node);
of_node_put(link->codecs->of_node);
snd_soc_of_put_dai_link_codecs(link);
clk_put(priv->clk_i2s_bus);
}
static const struct of_device_id snow_of_match[] = {
{ .compatible = "google,snow-audio-max98090", },
{ .compatible = "google,snow-audio-max98091", },
{ .compatible = "google,snow-audio-max98095", },
{},
};
MODULE_DEVICE_TABLE(of, snow_of_match);
static struct platform_driver snow_driver = {
.driver = {
.name = "snow-audio",
.pm = &snd_soc_pm_ops,
.of_match_table = snow_of_match,
},
.probe = snow_probe,
.remove_new = snow_remove,
};
module_platform_driver(snow_driver);
MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
MODULE_LICENSE("GPL");