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/module.h>
  11 #include <linux/of.h>
  12 #include <sound/simple_card_utils.h>
  13
  14 int asoc_simple_card_parse_daifmt(struct device *dev,
  15                                   struct device_node *node,
  16                                   struct device_node *codec,
  17                                   char *prefix,
  18                                   unsigned int *retfmt)
  19 {
  20         struct device_node *bitclkmaster = NULL;
  21         struct device_node *framemaster = NULL;
  22         int prefix_len = prefix ? strlen(prefix) : 0;
  23         unsigned int daifmt;
  24
  25         daifmt = snd_soc_of_parse_daifmt(node, prefix,
  26                                          &bitclkmaster, &framemaster);
  27         daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
  28
  29         if (prefix_len && !bitclkmaster && !framemaster) {
  30                 /*
  31                  * No dai-link level and master setting was not found from
  32                  * sound node level, revert back to legacy DT parsing and
  33                  * take the settings from codec node.
  34                  */
  35                 dev_dbg(dev, "Revert to legacy daifmt parsing\n");
  36
  37                 daifmt = snd_soc_of_parse_daifmt(codec, NULL, NULL, NULL) |
  38                         (daifmt & ~SND_SOC_DAIFMT_CLOCK_MASK);
  39         } else {
  40                 if (codec == bitclkmaster)
  41                         daifmt |= (codec == framemaster) ?
  42                                 SND_SOC_DAIFMT_CBM_CFM : SND_SOC_DAIFMT_CBM_CFS;
  43                 else
  44                         daifmt |= (codec == framemaster) ?
  45                                 SND_SOC_DAIFMT_CBS_CFM : SND_SOC_DAIFMT_CBS_CFS;
  46         }
  47
  48         of_node_put(bitclkmaster);
  49         of_node_put(framemaster);
  50
  51         *retfmt = daifmt;
  52
  53         return 0;
  54 }
  55 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_daifmt);
  56
  57 int asoc_simple_card_set_dailink_name(struct device *dev,
  58                                       struct snd_soc_dai_link *dai_link,
  59                                       const char *fmt, ...)
  60 {
  61         va_list ap;
  62         char *name = NULL;
  63         int ret = -ENOMEM;
  64
  65         va_start(ap, fmt);
  66         name = devm_kvasprintf(dev, GFP_KERNEL, fmt, ap);
  67         va_end(ap);
  68
  69         if (name) {
  70                 ret = 0;
  71
  72                 dai_link->name          = name;
  73                 dai_link->stream_name   = name;
  74         }
  75
  76         return ret;
  77 }
  78 EXPORT_SYMBOL_GPL(asoc_simple_card_set_dailink_name);
  79
  80 int asoc_simple_card_parse_card_name(struct snd_soc_card *card,
  81                                      char *prefix)
  82 {
  83         char prop[128];
  84         int ret;
  85
  86         snprintf(prop, sizeof(prop), "%sname", prefix);
  87
  88         /* Parse the card name from DT */
  89         ret = snd_soc_of_parse_card_name(card, prop);
  90         if (ret < 0)
  91                 return ret;
  92
  93         if (!card->name && card->dai_link)
  94                 card->name = card->dai_link->name;
  95
  96         return 0;
  97 }
  98 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_card_name);
  99
 100 /* Module information */
 101 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
 102 MODULE_DESCRIPTION("ALSA SoC Simple Card Utils");
 103 MODULE_LICENSE("GPL v2");