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1// SPDX-License-Identifier: (GPL-2.0 OR MIT)2//3// Copyright (c) 2020 BayLibre, SAS.4// Author: Jerome Brunet <jbrunet@baylibre.com>5 6#include <linux/module.h>7#include <linux/of_platform.h>8#include <sound/soc.h>9#include <sound/soc-dai.h>10 11#include "meson-card.h"12 13struct gx_dai_link_i2s_data {14 unsigned int mclk_fs;15};16 17/*18 * Base params for the codec to codec links19 * Those will be over-written by the CPU side of the link20 */21static const struct snd_soc_pcm_stream codec_params = {22 .formats = SNDRV_PCM_FMTBIT_S24_LE,23 .rate_min = 5525,24 .rate_max = 192000,25 .channels_min = 1,26 .channels_max = 8,27};28 29static int gx_card_i2s_be_hw_params(struct snd_pcm_substream *substream,30 struct snd_pcm_hw_params *params)31{32 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);33 struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card);34 struct gx_dai_link_i2s_data *be =35 (struct gx_dai_link_i2s_data *)priv->link_data[rtd->num];36 37 return meson_card_i2s_set_sysclk(substream, params, be->mclk_fs);38}39 40static const struct snd_soc_ops gx_card_i2s_be_ops = {41 .hw_params = gx_card_i2s_be_hw_params,42};43 44static int gx_card_parse_i2s(struct snd_soc_card *card,45 struct device_node *node,46 int *index)47{48 struct meson_card *priv = snd_soc_card_get_drvdata(card);49 struct snd_soc_dai_link *link = &card->dai_link[*index];50 struct gx_dai_link_i2s_data *be;51 52 /* Allocate i2s link parameters */53 be = devm_kzalloc(card->dev, sizeof(*be), GFP_KERNEL);54 if (!be)55 return -ENOMEM;56 priv->link_data[*index] = be;57 58 /* Setup i2s link */59 link->ops = &gx_card_i2s_be_ops;60 link->dai_fmt = meson_card_parse_daifmt(node, link->cpus->of_node);61 62 of_property_read_u32(node, "mclk-fs", &be->mclk_fs);63 64 return 0;65}66 67static int gx_card_cpu_identify(struct snd_soc_dai_link_component *c,68 char *match)69{70 if (of_device_is_compatible(c->of_node, DT_PREFIX "aiu")) {71 if (strstr(c->dai_name, match))72 return 1;73 }74 75 /* dai not matched */76 return 0;77}78 79static int gx_card_add_link(struct snd_soc_card *card, struct device_node *np,80 int *index)81{82 struct snd_soc_dai_link *dai_link = &card->dai_link[*index];83 struct snd_soc_dai_link_component *cpu;84 int ret;85 86 cpu = devm_kzalloc(card->dev, sizeof(*cpu), GFP_KERNEL);87 if (!cpu)88 return -ENOMEM;89 90 dai_link->cpus = cpu;91 dai_link->num_cpus = 1;92 93 ret = meson_card_parse_dai(card, np, dai_link->cpus);94 if (ret)95 return ret;96 97 if (gx_card_cpu_identify(dai_link->cpus, "FIFO"))98 return meson_card_set_fe_link(card, dai_link, np, true);99 100 ret = meson_card_set_be_link(card, dai_link, np);101 if (ret)102 return ret;103 104 /* Or apply codec to codec params if necessary */105 if (gx_card_cpu_identify(dai_link->cpus, "CODEC CTRL")) {106 dai_link->c2c_params = &codec_params;107 dai_link->num_c2c_params = 1;108 } else {109 dai_link->no_pcm = 1;110 /* Check if the cpu is the i2s encoder and parse i2s data */111 if (gx_card_cpu_identify(dai_link->cpus, "I2S Encoder"))112 ret = gx_card_parse_i2s(card, np, index);113 }114 115 return ret;116}117 118static const struct meson_card_match_data gx_card_match_data = {119 .add_link = gx_card_add_link,120};121 122static const struct of_device_id gx_card_of_match[] = {123 {124 .compatible = "amlogic,gx-sound-card",125 .data = &gx_card_match_data,126 }, {}127};128MODULE_DEVICE_TABLE(of, gx_card_of_match);129 130static struct platform_driver gx_card_pdrv = {131 .probe = meson_card_probe,132 .remove = meson_card_remove,133 .driver = {134 .name = "gx-sound-card",135 .of_match_table = gx_card_of_match,136 },137};138module_platform_driver(gx_card_pdrv);139 140MODULE_DESCRIPTION("Amlogic GX ALSA machine driver");141MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");142MODULE_LICENSE("GPL v2");143