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