sound/soc/generic/audio-graph-card.c

   1 /*
   2  * ASoC audio graph sound card support
   3  *
   4  * Copyright (C) 2016 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * based on ${LINUX}/sound/soc/generic/simple-card.c
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/clk.h>
  14 #include <linux/device.h>
  15 #include <linux/gpio.h>
  16 #include <linux/gpio/consumer.h>
  17 #include <linux/module.h>
  18 #include <linux/of.h>
  19 #include <linux/of_device.h>
  20 #include <linux/of_gpio.h>
  21 #include <linux/of_graph.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/string.h>
  24 #include <sound/jack.h>
  25 #include <sound/simple_card_utils.h>
  26
  27 struct graph_card_data {
  28         struct snd_soc_card snd_card;
  29         struct graph_dai_props {
  30                 struct asoc_simple_dai cpu_dai;
  31                 struct asoc_simple_dai codec_dai;
  32         } *dai_props;
  33         struct snd_soc_dai_link *dai_link;
  34         struct gpio_desc *pa_gpio;
  35 };
  36
  37 static int asoc_graph_card_outdrv_event(struct snd_soc_dapm_widget *w,
  38                                         struct snd_kcontrol *kcontrol,
  39                                         int event)
  40 {
  41         struct snd_soc_dapm_context *dapm = w->dapm;
  42         struct graph_card_data *priv = snd_soc_card_get_drvdata(dapm->card);
  43
  44         switch (event) {
  45         case SND_SOC_DAPM_POST_PMU:
  46                 gpiod_set_value_cansleep(priv->pa_gpio, 1);
  47                 break;
  48         case SND_SOC_DAPM_PRE_PMD:
  49                 gpiod_set_value_cansleep(priv->pa_gpio, 0);
  50                 break;
  51         default:
  52                 return -EINVAL;
  53         }
  54
  55         return 0;
  56 }
  57
  58 static const struct snd_soc_dapm_widget asoc_graph_card_dapm_widgets[] = {
  59         SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
  60                                0, 0, NULL, 0, asoc_graph_card_outdrv_event,
  61                                SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
  62 };
  63
  64 #define graph_priv_to_card(priv) (&(priv)->snd_card)
  65 #define graph_priv_to_props(priv, i) ((priv)->dai_props + (i))
  66 #define graph_priv_to_dev(priv) (graph_priv_to_card(priv)->dev)
  67 #define graph_priv_to_link(priv, i) (graph_priv_to_card(priv)->dai_link + (i))
  68
  69 static int asoc_graph_card_startup(struct snd_pcm_substream *substream)
  70 {
  71         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  72         struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
  73         struct graph_dai_props *dai_props = graph_priv_to_props(priv, rtd->num);
  74         int ret;
  75
  76         ret = asoc_simple_card_clk_enable(&dai_props->cpu_dai);
  77         if (ret)
  78                 return ret;
  79
  80         ret = asoc_simple_card_clk_enable(&dai_props->codec_dai);
  81         if (ret)
  82                 asoc_simple_card_clk_disable(&dai_props->cpu_dai);
  83
  84         return ret;
  85 }
  86
  87 static void asoc_graph_card_shutdown(struct snd_pcm_substream *substream)
  88 {
  89         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  90         struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
  91         struct graph_dai_props *dai_props = graph_priv_to_props(priv, rtd->num);
  92
  93         asoc_simple_card_clk_disable(&dai_props->cpu_dai);
  94
  95         asoc_simple_card_clk_disable(&dai_props->codec_dai);
  96 }
  97
  98 static const struct snd_soc_ops asoc_graph_card_ops = {
  99         .startup = asoc_graph_card_startup,
 100         .shutdown = asoc_graph_card_shutdown,
 101 };
 102
 103 static int asoc_graph_card_dai_init(struct snd_soc_pcm_runtime *rtd)
 104 {
 105         struct graph_card_data *priv =  snd_soc_card_get_drvdata(rtd->card);
 106         struct snd_soc_dai *codec = rtd->codec_dai;
 107         struct snd_soc_dai *cpu = rtd->cpu_dai;
 108         struct graph_dai_props *dai_props =
 109                 graph_priv_to_props(priv, rtd->num);
 110         int ret;
 111
 112         ret = asoc_simple_card_init_dai(codec, &dai_props->codec_dai);
 113         if (ret < 0)
 114                 return ret;
 115
 116         ret = asoc_simple_card_init_dai(cpu, &dai_props->cpu_dai);
 117         if (ret < 0)
 118                 return ret;
 119
 120         return 0;
 121 }
 122
 123 static int asoc_graph_card_dai_link_of(struct device_node *cpu_port,
 124                                         struct graph_card_data *priv,
 125                                         int idx)
 126 {
 127         struct device *dev = graph_priv_to_dev(priv);
 128         struct snd_soc_dai_link *dai_link = graph_priv_to_link(priv, idx);
 129         struct graph_dai_props *dai_props = graph_priv_to_props(priv, idx);
 130         struct asoc_simple_dai *cpu_dai = &dai_props->cpu_dai;
 131         struct asoc_simple_dai *codec_dai = &dai_props->codec_dai;
 132         struct device_node *cpu_ep    = of_get_next_child(cpu_port, NULL);
 133         struct device_node *codec_ep = of_graph_get_remote_endpoint(cpu_ep);
 134         struct device_node *rcpu_ep = of_graph_get_remote_endpoint(codec_ep);
 135         int ret;
 136
 137         if (rcpu_ep != cpu_ep) {
 138                 dev_err(dev, "remote-endpoint mismatch (%s/%s/%s)\n",
 139                         cpu_ep->name, codec_ep->name, rcpu_ep->name);
 140                 ret = -EINVAL;
 141                 goto dai_link_of_err;
 142         }
 143
 144         ret = asoc_simple_card_parse_daifmt(dev, cpu_ep, codec_ep,
 145                                             NULL, &dai_link->dai_fmt);
 146         if (ret < 0)
 147                 goto dai_link_of_err;
 148
 149         /*
 150          * we need to consider "mclk-fs" around here
 151          * see simple-card
 152          */
 153
 154         ret = asoc_simple_card_parse_graph_cpu(cpu_ep, dai_link);
 155         if (ret < 0)
 156                 goto dai_link_of_err;
 157
 158         ret = asoc_simple_card_parse_graph_codec(codec_ep, dai_link);
 159         if (ret < 0)
 160                 goto dai_link_of_err;
 161
 162         ret = asoc_simple_card_of_parse_tdm(cpu_ep, cpu_dai);
 163         if (ret < 0)
 164                 goto dai_link_of_err;
 165
 166         ret = asoc_simple_card_of_parse_tdm(codec_ep, codec_dai);
 167         if (ret < 0)
 168                 goto dai_link_of_err;
 169
 170         ret = asoc_simple_card_parse_clk_cpu(dev, cpu_ep, dai_link, cpu_dai);
 171         if (ret < 0)
 172                 goto dai_link_of_err;
 173
 174         ret = asoc_simple_card_parse_clk_codec(dev, codec_ep, dai_link, codec_dai);
 175         if (ret < 0)
 176                 goto dai_link_of_err;
 177
 178         ret = asoc_simple_card_canonicalize_dailink(dai_link);
 179         if (ret < 0)
 180                 goto dai_link_of_err;
 181
 182         ret = asoc_simple_card_set_dailink_name(dev, dai_link,
 183                                                 "%s-%s",
 184                                                 dai_link->cpu_dai_name,
 185                                                 dai_link->codec_dai_name);
 186         if (ret < 0)
 187                 goto dai_link_of_err;
 188
 189         dai_link->ops = &asoc_graph_card_ops;
 190         dai_link->init = asoc_graph_card_dai_init;
 191
 192         asoc_simple_card_canonicalize_cpu(dai_link,
 193                 of_graph_get_endpoint_count(dai_link->cpu_of_node) == 1);
 194
 195 dai_link_of_err:
 196         of_node_put(cpu_ep);
 197         of_node_put(rcpu_ep);
 198         of_node_put(codec_ep);
 199
 200         return ret;
 201 }
 202
 203 static int asoc_graph_card_parse_of(struct graph_card_data *priv)
 204 {
 205         struct of_phandle_iterator it;
 206         struct device *dev = graph_priv_to_dev(priv);
 207         struct snd_soc_card *card = graph_priv_to_card(priv);
 208         struct device_node *node = dev->of_node;
 209         int rc, idx = 0;
 210         int ret;
 211
 212         ret = asoc_simple_card_of_parse_widgets(card, NULL);
 213         if (ret < 0)
 214                 return ret;
 215
 216         ret = asoc_simple_card_of_parse_routing(card, NULL, 1);
 217         if (ret < 0)
 218                 return ret;
 219
 220         /*
 221          * we need to consider "mclk-fs" around here
 222          * see simple-card
 223          */
 224
 225         of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
 226                 ret = asoc_graph_card_dai_link_of(it.node, priv, idx++);
 227                 if (ret < 0) {
 228                         of_node_put(it.node);
 229
 230                         return ret;
 231                 }
 232         }
 233
 234         return asoc_simple_card_parse_card_name(card, NULL);
 235 }
 236
 237 static int asoc_graph_get_dais_count(struct device *dev)
 238 {
 239         struct of_phandle_iterator it;
 240         struct device_node *node = dev->of_node;
 241         int count = 0;
 242         int rc;
 243
 244         of_for_each_phandle(&it, rc, node, "dais", NULL, 0)
 245                 count++;
 246
 247         return count;
 248 }
 249
 250 static int asoc_graph_card_probe(struct platform_device *pdev)
 251 {
 252         struct graph_card_data *priv;
 253         struct snd_soc_dai_link *dai_link;
 254         struct graph_dai_props *dai_props;
 255         struct device *dev = &pdev->dev;
 256         struct snd_soc_card *card;
 257         int num, ret;
 258
 259         /* Allocate the private data and the DAI link array */
 260         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 261         if (!priv)
 262                 return -ENOMEM;
 263
 264         num = asoc_graph_get_dais_count(dev);
 265         if (num == 0)
 266                 return -EINVAL;
 267
 268         dai_props = devm_kzalloc(dev, sizeof(*dai_props) * num, GFP_KERNEL);
 269         dai_link  = devm_kzalloc(dev, sizeof(*dai_link)  * num, GFP_KERNEL);
 270         if (!dai_props || !dai_link)
 271                 return -ENOMEM;
 272
 273         priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
 274         if (IS_ERR(priv->pa_gpio)) {
 275                 ret = PTR_ERR(priv->pa_gpio);
 276                 dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
 277                 return ret;
 278         }
 279
 280         priv->dai_props                 = dai_props;
 281         priv->dai_link                  = dai_link;
 282
 283         /* Init snd_soc_card */
 284         card = graph_priv_to_card(priv);
 285         card->owner     = THIS_MODULE;
 286         card->dev       = dev;
 287         card->dai_link  = dai_link;
 288         card->num_links = num;
 289         card->dapm_widgets = asoc_graph_card_dapm_widgets;
 290         card->num_dapm_widgets = ARRAY_SIZE(asoc_graph_card_dapm_widgets);
 291
 292         ret = asoc_graph_card_parse_of(priv);
 293         if (ret < 0) {
 294                 if (ret != -EPROBE_DEFER)
 295                         dev_err(dev, "parse error %d\n", ret);
 296                 goto err;
 297         }
 298
 299         snd_soc_card_set_drvdata(card, priv);
 300
 301         ret = devm_snd_soc_register_card(dev, card);
 302         if (ret < 0)
 303                 goto err;
 304
 305         return 0;
 306 err:
 307         asoc_simple_card_clean_reference(card);
 308
 309         return ret;
 310 }
 311
 312 static int asoc_graph_card_remove(struct platform_device *pdev)
 313 {
 314         struct snd_soc_card *card = platform_get_drvdata(pdev);
 315
 316         return asoc_simple_card_clean_reference(card);
 317 }
 318
 319 static const struct of_device_id asoc_graph_of_match[] = {
 320         { .compatible = "audio-graph-card", },
 321         {},
 322 };
 323 MODULE_DEVICE_TABLE(of, asoc_graph_of_match);
 324
 325 static struct platform_driver asoc_graph_card = {
 326         .driver = {
 327                 .name = "asoc-audio-graph-card",
 328                 .pm = &snd_soc_pm_ops,
 329                 .of_match_table = asoc_graph_of_match,
 330         },
 331         .probe = asoc_graph_card_probe,
 332         .remove = asoc_graph_card_remove,
 333 };
 334 module_platform_driver(asoc_graph_card);
 335
 336 MODULE_ALIAS("platform:asoc-audio-graph-card");
 337 MODULE_LICENSE("GPL v2");
 338 MODULE_DESCRIPTION("ASoC Audio Graph Sound Card");
 339 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");