sound/soc/generic/simple-card-utils.c

   1 /*
   2  * simple-card-core.c
   3  *
   4  * Copyright (c) 2016 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/of.h>
  11 #include <sound/simple_card_utils.h>
  12
  13 int asoc_simple_card_parse_daifmt(struct device *dev,
  14                                   struct device_node *node,
  15                                   struct device_node *codec,
  16                                   char *prefix,
  17                                   unsigned int *retfmt)
  18 {
  19         struct device_node *bitclkmaster = NULL;
  20         struct device_node *framemaster = NULL;
  21         int prefix_len = prefix ? strlen(prefix) : 0;
  22         unsigned int daifmt;
  23
  24         daifmt = snd_soc_of_parse_daifmt(node, prefix,
  25                                          &bitclkmaster, &framemaster);
  26         daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
  27
  28         if (prefix_len && !bitclkmaster && !framemaster) {
  29                 /*
  30                  * No dai-link level and master setting was not found from
  31                  * sound node level, revert back to legacy DT parsing and
  32                  * take the settings from codec node.
  33                  */
  34                 dev_dbg(dev, "Revert to legacy daifmt parsing\n");
  35
  36                 daifmt = snd_soc_of_parse_daifmt(codec, NULL, NULL, NULL) |
  37                         (daifmt & ~SND_SOC_DAIFMT_CLOCK_MASK);
  38         } else {
  39                 if (codec == bitclkmaster)
  40                         daifmt |= (codec == framemaster) ?
  41                                 SND_SOC_DAIFMT_CBM_CFM : SND_SOC_DAIFMT_CBM_CFS;
  42                 else
  43                         daifmt |= (codec == framemaster) ?
  44                                 SND_SOC_DAIFMT_CBS_CFM : SND_SOC_DAIFMT_CBS_CFS;
  45         }
  46
  47         of_node_put(bitclkmaster);
  48         of_node_put(framemaster);
  49
  50         *retfmt = daifmt;
  51
  52         return 0;
  53 }
  54 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_daifmt);
  55
  56 int asoc_simple_card_set_dailink_name(struct device *dev,
  57                                       struct snd_soc_dai_link *dai_link,
  58                                       const char *fmt, ...)
  59 {
  60         va_list ap;
  61         char *name = NULL;
  62         int ret = -ENOMEM;
  63
  64         va_start(ap, fmt);
  65         name = devm_kvasprintf(dev, GFP_KERNEL, fmt, ap);
  66         va_end(ap);
  67
  68         if (name) {
  69                 ret = 0;
  70
  71                 dai_link->name          = name;
  72                 dai_link->stream_name   = name;
  73         }
  74
  75         return ret;
  76 }
  77 EXPORT_SYMBOL_GPL(asoc_simple_card_set_dailink_name);
  78
  79 int asoc_simple_card_parse_card_name(struct snd_soc_card *card,
  80                                      char *prefix)
  81 {
  82         char prop[128];
  83         int ret;
  84
  85         snprintf(prop, sizeof(prop), "%sname", prefix);
  86
  87         /* Parse the card name from DT */
  88         ret = snd_soc_of_parse_card_name(card, prop);
  89         if (ret < 0)
  90                 return ret;
  91
  92         if (!card->name && card->dai_link)
  93                 card->name = card->dai_link->name;
  94
  95         return 0;
  96 }
  97 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_card_name);