LXR linux/sound/soc/meson/gx-card.c

   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 links
  19 * Those will be over-written by the CPU side of the link
  20 */
  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 = asoc_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->of_node,
  94                                   &dai_link->cpus->dai_name);
  95        if (ret)
  96                return ret;
  97
  98        if (gx_card_cpu_identify(dai_link->cpus, "FIFO"))
  99                return  meson_card_set_fe_link(card, dai_link, np, true);
 100
 101        ret = meson_card_set_be_link(card, dai_link, np);
 102        if (ret)
 103                return ret;
 104
 105        /* Or apply codec to codec params if necessary */
 106        if (gx_card_cpu_identify(dai_link->cpus, "CODEC CTRL")) {
 107                dai_link->params = &codec_params;
 108        } else {
 109                dai_link->no_pcm = 1;
 110                snd_soc_dai_link_set_capabilities(dai_link);
 111                /* Check if the cpu is the i2s encoder and parse i2s data */
 112                if (gx_card_cpu_identify(dai_link->cpus, "I2S Encoder"))
 113                        ret = gx_card_parse_i2s(card, np, index);
 114        }
 115
 116        return ret;
 117}
 118
 119static const struct meson_card_match_data gx_card_match_data = {
 120        .add_link = gx_card_add_link,
 121};
 122
 123static const struct of_device_id gx_card_of_match[] = {
 124        {
 125                .compatible = "amlogic,gx-sound-card",
 126                .data = &gx_card_match_data,
 127        }, {}
 128};
 129MODULE_DEVICE_TABLE(of, gx_card_of_match);
 130
 131static struct platform_driver gx_card_pdrv = {
 132        .probe = meson_card_probe,
 133        .remove = meson_card_remove,
 134        .driver = {
 135                .name = "gx-sound-card",
 136                .of_match_table = gx_card_of_match,
 137        },
 138};
 139module_platform_driver(gx_card_pdrv);
 140
 141MODULE_DESCRIPTION("Amlogic GX ALSA machine driver");
 142MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
 143MODULE_LICENSE("GPL v2");
 144