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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
//
// Copyright (c) 2020 BayLibre, SAS.
// Author: Jerome Brunet <jbrunet@baylibre.com>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>
#include "meson-card.h"
struct gx_dai_link_i2s_data {
unsigned int mclk_fs;
};
/*
* Base params for the codec to codec links
* Those will be over-written by the CPU side of the link
*/
static const struct snd_soc_pcm_stream codec_params = {
.formats = SNDRV_PCM_FMTBIT_S24_LE,
.rate_min = 5525,
.rate_max = 192000,
.channels_min = 1,
.channels_max = 8,
};
static int gx_card_i2s_be_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card);
struct gx_dai_link_i2s_data *be =
(struct gx_dai_link_i2s_data *)priv->link_data[rtd->num];
return meson_card_i2s_set_sysclk(substream, params, be->mclk_fs);
}
static const struct snd_soc_ops gx_card_i2s_be_ops = {
.hw_params = gx_card_i2s_be_hw_params,
};
static int gx_card_parse_i2s(struct snd_soc_card *card,
struct device_node *node,
int *index)
{
struct meson_card *priv = snd_soc_card_get_drvdata(card);
struct snd_soc_dai_link *link = &card->dai_link[*index];
struct gx_dai_link_i2s_data *be;
/* Allocate i2s link parameters */
be = devm_kzalloc(card->dev, sizeof(*be), GFP_KERNEL);
if (!be)
return -ENOMEM;
priv->link_data[*index] = be;
/* Setup i2s link */
link->ops = &gx_card_i2s_be_ops;
link->dai_fmt = meson_card_parse_daifmt(node, link->cpus->of_node);
of_property_read_u32(node, "mclk-fs", &be->mclk_fs);
return 0;
}
static int gx_card_cpu_identify(struct snd_soc_dai_link_component *c,
char *match)
{
if (of_device_is_compatible(c->of_node, DT_PREFIX "aiu")) {
if (strstr(c->dai_name, match))
return 1;
}
/* dai not matched */
return 0;
}
static int gx_card_add_link(struct snd_soc_card *card, struct device_node *np,
int *index)
{
struct snd_soc_dai_link *dai_link = &card->dai_link[*index];
struct snd_soc_dai_link_component *cpu;
int ret;
cpu = devm_kzalloc(card->dev, sizeof(*cpu), GFP_KERNEL);
if (!cpu)
return -ENOMEM;
dai_link->cpus = cpu;
dai_link->num_cpus = 1;
ret = meson_card_parse_dai(card, np, &dai_link->cpus->of_node,
&dai_link->cpus->dai_name);
if (ret)
return ret;
if (gx_card_cpu_identify(dai_link->cpus, "FIFO"))
ret = meson_card_set_fe_link(card, dai_link, np, true);
else
ret = meson_card_set_be_link(card, dai_link, np);
if (ret)
return ret;
/* Check if the cpu is the i2s encoder and parse i2s data */
if (gx_card_cpu_identify(dai_link->cpus, "I2S Encoder"))
ret = gx_card_parse_i2s(card, np, index);
/* Or apply codec to codec params if necessary */
else if (gx_card_cpu_identify(dai_link->cpus, "CODEC CTRL")) {
dai_link->params = &codec_params;
dai_link->no_pcm = 0; /* link is not a DPCM BE */
}
return ret;
}
static const struct meson_card_match_data gx_card_match_data = {
.add_link = gx_card_add_link,
};
static const struct of_device_id gx_card_of_match[] = {
{
.compatible = "amlogic,gx-sound-card",
.data = &gx_card_match_data,
}, {}
};
MODULE_DEVICE_TABLE(of, gx_card_of_match);
static struct platform_driver gx_card_pdrv = {
.probe = meson_card_probe,
.remove = meson_card_remove,
.driver = {
.name = "gx-sound-card",
.of_match_table = gx_card_of_match,
},
};
module_platform_driver(gx_card_pdrv);
MODULE_DESCRIPTION("Amlogic GX ALSA machine driver");
MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
MODULE_LICENSE("GPL v2");
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