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_node *node,
 102                                struct device_node *dai_of_node,
 103                                struct asoc_simple_dai *simple_dai)
 104 {
 105         struct clk *clk;
 106         u32 val;
 107
 108         /*
 109          * Parse dai->sysclk come from "clocks = <&xxx>"
 110          * (if system has common clock)
 111          *  or "system-clock-frequency = <xxx>"
 112          *  or device's module clock.
 113          */
 114         clk = of_clk_get(node, 0);
 115         if (!IS_ERR(clk)) {
 116                 simple_dai->sysclk = clk_get_rate(clk);
 117                 simple_dai->clk = clk;
 118         } else if (!of_property_read_u32(node, "system-clock-frequency", &val)) {
 119                 simple_dai->sysclk = val;
 120         } else {
 121                 clk = of_clk_get(dai_of_node, 0);
 122                 if (!IS_ERR(clk))
 123                         simple_dai->sysclk = clk_get_rate(clk);
 124         }
 125
 126         return 0;
 127 }
 128 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_clk);
 129
 130 int asoc_simple_card_parse_dai(struct device_node *node,
 131                                     struct device_node **dai_of_node,
 132                                     const char **dai_name,
 133                                     const char *list_name,
 134                                     const char *cells_name,
 135                                     int *is_single_link)
 136 {
 137         struct of_phandle_args args;
 138         int ret;
 139
 140         if (!node)
 141                 return 0;
 142
 143         /*
 144          * Get node via "sound-dai = <&phandle port>"
 145          * it will be used as xxx_of_node on soc_bind_dai_link()
 146          */
 147         ret = of_parse_phandle_with_args(node, list_name, cells_name, 0, &args);
 148         if (ret)
 149                 return ret;
 150
 151         /* Get dai->name */
 152         if (dai_name) {
 153                 ret = snd_soc_of_get_dai_name(node, dai_name);
 154                 if (ret < 0)
 155                         return ret;
 156         }
 157
 158         *dai_of_node = args.np;
 159
 160         if (is_single_link)
 161                 *is_single_link = !args.args_count;
 162
 163         return 0;
 164 }
 165 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_dai);
 166
 167 int asoc_simple_card_init_dai(struct snd_soc_dai *dai,
 168                               struct asoc_simple_dai *simple_dai)
 169 {
 170         int ret;
 171
 172         if (simple_dai->sysclk) {
 173                 ret = snd_soc_dai_set_sysclk(dai, 0, simple_dai->sysclk, 0);
 174                 if (ret && ret != -ENOTSUPP) {
 175                         dev_err(dai->dev, "simple-card: set_sysclk error\n");
 176                         return ret;
 177                 }
 178         }
 179
 180         if (simple_dai->slots) {
 181                 ret = snd_soc_dai_set_tdm_slot(dai,
 182                                                simple_dai->tx_slot_mask,
 183                                                simple_dai->rx_slot_mask,
 184                                                simple_dai->slots,
 185                                                simple_dai->slot_width);
 186                 if (ret && ret != -ENOTSUPP) {
 187                         dev_err(dai->dev, "simple-card: set_tdm_slot error\n");
 188                         return ret;
 189                 }
 190         }
 191
 192         return 0;
 193 }
 194 EXPORT_SYMBOL_GPL(asoc_simple_card_init_dai);
 195
 196 int asoc_simple_card_canonicalize_dailink(struct snd_soc_dai_link *dai_link)
 197 {
 198         /* Assumes platform == cpu */
 199         if (!dai_link->platform_of_node)
 200                 dai_link->platform_of_node = dai_link->cpu_of_node;
 201
 202         return 0;
 203 }
 204 EXPORT_SYMBOL_GPL(asoc_simple_card_canonicalize_dailink);
 205
 206 void asoc_simple_card_canonicalize_cpu(struct snd_soc_dai_link *dai_link,
 207                                        int is_single_links)
 208 {
 209         /*
 210          * In soc_bind_dai_link() will check cpu name after
 211          * of_node matching if dai_link has cpu_dai_name.
 212          * but, it will never match if name was created by
 213          * fmt_single_name() remove cpu_dai_name if cpu_args
 214          * was 0. See:
 215          *      fmt_single_name()
 216          *      fmt_multiple_name()
 217          */
 218         if (is_single_links)
 219                 dai_link->cpu_dai_name = NULL;
 220 }
 221 EXPORT_SYMBOL_GPL(asoc_simple_card_canonicalize_cpu);
 222
 223 int asoc_simple_card_clean_reference(struct snd_soc_card *card)
 224 {
 225         struct snd_soc_dai_link *dai_link;
 226         int num_links;
 227
 228         for (num_links = 0, dai_link = card->dai_link;
 229              num_links < card->num_links;
 230              num_links++, dai_link++) {
 231                 of_node_put(dai_link->cpu_of_node);
 232                 of_node_put(dai_link->codec_of_node);
 233         }
 234         return 0;
 235 }
 236 EXPORT_SYMBOL_GPL(asoc_simple_card_clean_reference);
 237
 238 /* Module information */
 239 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
 240 MODULE_DESCRIPTION("ALSA SoC Simple Card Utils");
 241 MODULE_LICENSE("GPL v2");