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

   1 /*
   2  * simple-card-utils.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/clk.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <sound/simple_card_utils.h>
  14
  15 int asoc_simple_card_parse_daifmt(struct device *dev,
  16                                   struct device_node *node,
  17                                   struct device_node *codec,
  18                                   char *prefix,
  19                                   unsigned int *retfmt)
  20 {
  21         struct device_node *bitclkmaster = NULL;
  22         struct device_node *framemaster = NULL;
  23         int prefix_len = prefix ? strlen(prefix) : 0;
  24         unsigned int daifmt;
  25
  26         daifmt = snd_soc_of_parse_daifmt(node, prefix,
  27                                          &bitclkmaster, &framemaster);
  28         daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
  29
  30         if (prefix_len && !bitclkmaster && !framemaster) {
  31                 /*
  32                  * No dai-link level and master setting was not found from
  33                  * sound node level, revert back to legacy DT parsing and
  34                  * take the settings from codec node.
  35                  */
  36                 dev_dbg(dev, "Revert to legacy daifmt parsing\n");
  37
  38                 daifmt = snd_soc_of_parse_daifmt(codec, NULL, NULL, NULL) |
  39                         (daifmt & ~SND_SOC_DAIFMT_CLOCK_MASK);
  40         } else {
  41                 if (codec == bitclkmaster)
  42                         daifmt |= (codec == framemaster) ?
  43                                 SND_SOC_DAIFMT_CBM_CFM : SND_SOC_DAIFMT_CBM_CFS;
  44                 else
  45                         daifmt |= (codec == framemaster) ?
  46                                 SND_SOC_DAIFMT_CBS_CFM : SND_SOC_DAIFMT_CBS_CFS;
  47         }
  48
  49         of_node_put(bitclkmaster);
  50         of_node_put(framemaster);
  51
  52         *retfmt = daifmt;
  53
  54         return 0;
  55 }
  56 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_daifmt);
  57
  58 int asoc_simple_card_set_dailink_name(struct device *dev,
  59                                       struct snd_soc_dai_link *dai_link,
  60                                       const char *fmt, ...)
  61 {
  62         va_list ap;
  63         char *name = NULL;
  64         int ret = -ENOMEM;
  65
  66         va_start(ap, fmt);
  67         name = devm_kvasprintf(dev, GFP_KERNEL, fmt, ap);
  68         va_end(ap);
  69
  70         if (name) {
  71                 ret = 0;
  72
  73                 dai_link->name          = name;
  74                 dai_link->stream_name   = name;
  75         }
  76
  77         return ret;
  78 }
  79 EXPORT_SYMBOL_GPL(asoc_simple_card_set_dailink_name);
  80
  81 int asoc_simple_card_parse_card_name(struct snd_soc_card *card,
  82                                      char *prefix)
  83 {
  84         char prop[128];
  85         int ret;
  86
  87         snprintf(prop, sizeof(prop), "%sname", prefix);
  88
  89         /* Parse the card name from DT */
  90         ret = snd_soc_of_parse_card_name(card, prop);
  91         if (ret < 0)
  92                 return ret;
  93
  94         if (!card->name && card->dai_link)
  95                 card->name = card->dai_link->name;
  96
  97         return 0;
  98 }
  99 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_card_name);
 100
 101 int asoc_simple_card_parse_clk(struct device *dev,
 102                                struct device_node *node,
 103                                struct device_node *dai_of_node,
 104                                struct asoc_simple_dai *simple_dai)
 105 {
 106         struct clk *clk;
 107         u32 val;
 108
 109         /*
 110          * Parse dai->sysclk come from "clocks = <&xxx>"
 111          * (if system has common clock)
 112          *  or "system-clock-frequency = <xxx>"
 113          *  or device's module clock.
 114          */
 115         clk = devm_get_clk_from_child(dev, node, NULL);
 116         if (!IS_ERR(clk)) {
 117                 simple_dai->sysclk = clk_get_rate(clk);
 118                 simple_dai->clk = clk;
 119         } else if (!of_property_read_u32(node, "system-clock-frequency", &val)) {
 120                 simple_dai->sysclk = val;
 121         } else {
 122                 clk = devm_get_clk_from_child(dev, dai_of_node, NULL);
 123                 if (!IS_ERR(clk))
 124                         simple_dai->sysclk = clk_get_rate(clk);
 125         }
 126
 127         return 0;
 128 }
 129 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_clk);
 130
 131 int asoc_simple_card_parse_dai(struct device_node *node,
 132                                     struct device_node **dai_of_node,
 133                                     const char **dai_name,
 134                                     const char *list_name,
 135                                     const char *cells_name,
 136                                     int *is_single_link)
 137 {
 138         struct of_phandle_args args;
 139         int ret;
 140
 141         if (!node)
 142                 return 0;
 143
 144         /*
 145          * Get node via "sound-dai = <&phandle port>"
 146          * it will be used as xxx_of_node on soc_bind_dai_link()
 147          */
 148         ret = of_parse_phandle_with_args(node, list_name, cells_name, 0, &args);
 149         if (ret)
 150                 return ret;
 151
 152         /* Get dai->name */
 153         if (dai_name) {
 154                 ret = snd_soc_of_get_dai_name(node, dai_name);
 155                 if (ret < 0)
 156                         return ret;
 157         }
 158
 159         *dai_of_node = args.np;
 160
 161         if (is_single_link)
 162                 *is_single_link = !args.args_count;
 163
 164         return 0;
 165 }
 166 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_dai);
 167
 168 int asoc_simple_card_init_dai(struct snd_soc_dai *dai,
 169                               struct asoc_simple_dai *simple_dai)
 170 {
 171         int ret;
 172
 173         if (simple_dai->sysclk) {
 174                 ret = snd_soc_dai_set_sysclk(dai, 0, simple_dai->sysclk, 0);
 175                 if (ret && ret != -ENOTSUPP) {
 176                         dev_err(dai->dev, "simple-card: set_sysclk error\n");
 177                         return ret;
 178                 }
 179         }
 180
 181         if (simple_dai->slots) {
 182                 ret = snd_soc_dai_set_tdm_slot(dai,
 183                                                simple_dai->tx_slot_mask,
 184                                                simple_dai->rx_slot_mask,
 185                                                simple_dai->slots,
 186                                                simple_dai->slot_width);
 187                 if (ret && ret != -ENOTSUPP) {
 188                         dev_err(dai->dev, "simple-card: set_tdm_slot error\n");
 189                         return ret;
 190                 }
 191         }
 192
 193         return 0;
 194 }
 195 EXPORT_SYMBOL_GPL(asoc_simple_card_init_dai);
 196
 197 int asoc_simple_card_canonicalize_dailink(struct snd_soc_dai_link *dai_link)
 198 {
 199         /* Assumes platform == cpu */
 200         if (!dai_link->platform_of_node)
 201                 dai_link->platform_of_node = dai_link->cpu_of_node;
 202
 203         return 0;
 204 }
 205 EXPORT_SYMBOL_GPL(asoc_simple_card_canonicalize_dailink);
 206
 207 void asoc_simple_card_canonicalize_cpu(struct snd_soc_dai_link *dai_link,
 208                                        int is_single_links)
 209 {
 210         /*
 211          * In soc_bind_dai_link() will check cpu name after
 212          * of_node matching if dai_link has cpu_dai_name.
 213          * but, it will never match if name was created by
 214          * fmt_single_name() remove cpu_dai_name if cpu_args
 215          * was 0. See:
 216          *      fmt_single_name()
 217          *      fmt_multiple_name()
 218          */
 219         if (is_single_links)
 220                 dai_link->cpu_dai_name = NULL;
 221 }
 222 EXPORT_SYMBOL_GPL(asoc_simple_card_canonicalize_cpu);
 223
 224 int asoc_simple_card_clean_reference(struct snd_soc_card *card)
 225 {
 226         struct snd_soc_dai_link *dai_link;
 227         int num_links;
 228
 229         for (num_links = 0, dai_link = card->dai_link;
 230              num_links < card->num_links;
 231              num_links++, dai_link++) {
 232                 of_node_put(dai_link->cpu_of_node);
 233                 of_node_put(dai_link->codec_of_node);
 234         }
 235         return 0;
 236 }
 237 EXPORT_SYMBOL_GPL(asoc_simple_card_clean_reference);
 238
 239 /* Module information */
 240 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
 241 MODULE_DESCRIPTION("ALSA SoC Simple Card Utils");
 242 MODULE_LICENSE("GPL v2");