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
  13 struct 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  */
  21 static 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
  29 static 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
  40 static const struct snd_soc_ops gx_card_i2s_be_ops = {
  41         .hw_params = gx_card_i2s_be_hw_params,
  42 };
  43
  44 static 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
  67 static 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
  79 static 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
 119 static const struct meson_card_match_data gx_card_match_data = {
 120         .add_link = gx_card_add_link,
 121 };
 122
 123 static const struct of_device_id gx_card_of_match[] = {
 124         {
 125                 .compatible = "amlogic,gx-sound-card",
 126                 .data = &gx_card_match_data,
 127         }, {}
 128 };
 129 MODULE_DEVICE_TABLE(of, gx_card_of_match);
 130
 131 static 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 };
 139 module_platform_driver(gx_card_pdrv);
 140
 141 MODULE_DESCRIPTION("Amlogic GX ALSA machine driver");
 142 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
 143 MODULE_LICENSE("GPL v2");