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- // SPDX-License-Identifier: (GPL-2.0 OR MIT)
- //
- // Copyright (c) 2020 BayLibre, SAS.
- // Author: Jerome Brunet <[email protected]>
- #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 = asoc_substream_to_rtd(substream);
- 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"))
- return meson_card_set_fe_link(card, dai_link, np, true);
- ret = meson_card_set_be_link(card, dai_link, np);
- if (ret)
- return ret;
- /* Or apply codec to codec params if necessary */
- if (gx_card_cpu_identify(dai_link->cpus, "CODEC CTRL")) {
- dai_link->params = &codec_params;
- } else {
- dai_link->no_pcm = 1;
- snd_soc_dai_link_set_capabilities(dai_link);
- /* 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);
- }
- 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 <[email protected]>");
- MODULE_LICENSE("GPL v2");
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