1 files changed, 338 insertions, 0 deletions

diff --git a/sound/soc/generic/audio-graph-card.c b/sound/soc/generic/audio-graph-card.c
new file mode 100644
index 000000000000..105ec3a6e30d
--- /dev/null
+++ b/sound/soc/generic/audio-graph-card.c
@@ -0,0 +1,338 @@
+/*
+ * ASoC audio graph sound card support
+ *
+ * Copyright (C) 2016 Renesas Solutions Corp.
+ * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+ *
+ * based on ${LINUX}/sound/soc/generic/simple-card.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/string.h>
+#include <sound/jack.h>
+#include <sound/simple_card_utils.h>
+
+struct graph_card_data {
+        struct snd_soc_card snd_card;
+        struct graph_dai_props {
+                struct asoc_simple_dai cpu_dai;
+                struct asoc_simple_dai codec_dai;
+        } *dai_props;
+        struct snd_soc_dai_link *dai_link;
+        struct gpio_desc *pa_gpio;
+};
+
+static int asoc_graph_card_outdrv_event(struct snd_soc_dapm_widget *w,
+                                        struct snd_kcontrol *kcontrol,
+                                        int event)
+{
+        struct snd_soc_dapm_context *dapm = w->dapm;
+        struct graph_card_data *priv = snd_soc_card_get_drvdata(dapm->card);
+
+        switch (event) {
+        case SND_SOC_DAPM_POST_PMU:
+                gpiod_set_value_cansleep(priv->pa_gpio, 1);
+                break;
+        case SND_SOC_DAPM_PRE_PMD:
+                gpiod_set_value_cansleep(priv->pa_gpio, 0);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static const struct snd_soc_dapm_widget asoc_graph_card_dapm_widgets[] = {
+        SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
+                               0, 0, NULL, 0, asoc_graph_card_outdrv_event,
+                               SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
+};
+
+#define graph_priv_to_card(priv) (&(priv)->snd_card)
+#define graph_priv_to_props(priv, i) ((priv)->dai_props + (i))
+#define graph_priv_to_dev(priv) (graph_priv_to_card(priv)->dev)
+#define graph_priv_to_link(priv, i) (graph_priv_to_card(priv)->dai_link + (i))
+
+static int asoc_graph_card_startup(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
+        struct graph_dai_props *dai_props = graph_priv_to_props(priv, rtd->num);
+        int ret;
+
+        ret = asoc_simple_card_clk_enable(&dai_props->cpu_dai);
+        if (ret)
+                return ret;
+
+        ret = asoc_simple_card_clk_enable(&dai_props->codec_dai);
+        if (ret)
+                asoc_simple_card_clk_disable(&dai_props->cpu_dai);
+
+        return ret;
+}
+
+static void asoc_graph_card_shutdown(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
+        struct graph_dai_props *dai_props = graph_priv_to_props(priv, rtd->num);
+
+        asoc_simple_card_clk_disable(&dai_props->cpu_dai);
+
+        asoc_simple_card_clk_disable(&dai_props->codec_dai);
+}
+
+static struct snd_soc_ops asoc_graph_card_ops = {
+        .startup = asoc_graph_card_startup,
+        .shutdown = asoc_graph_card_shutdown,
+};
+
+static int asoc_graph_card_dai_init(struct snd_soc_pcm_runtime *rtd)
+{
+        struct graph_card_data *priv =  snd_soc_card_get_drvdata(rtd->card);
+        struct snd_soc_dai *codec = rtd->codec_dai;
+        struct snd_soc_dai *cpu = rtd->cpu_dai;
+        struct graph_dai_props *dai_props =
+                graph_priv_to_props(priv, rtd->num);
+        int ret;
+
+        ret = asoc_simple_card_init_dai(codec, &dai_props->codec_dai);
+        if (ret < 0)
+                return ret;
+
+        ret = asoc_simple_card_init_dai(cpu, &dai_props->cpu_dai);
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+
+static int asoc_graph_card_dai_link_of(struct device_node *cpu_port,
+                                        struct graph_card_data *priv,
+                                        int idx)
+{
+        struct device *dev = graph_priv_to_dev(priv);
+        struct snd_soc_dai_link *dai_link = graph_priv_to_link(priv, idx);
+        struct graph_dai_props *dai_props = graph_priv_to_props(priv, idx);
+        struct asoc_simple_dai *cpu_dai = &dai_props->cpu_dai;
+        struct asoc_simple_dai *codec_dai = &dai_props->codec_dai;
+        struct device_node *cpu_ep    = of_get_next_child(cpu_port, NULL);
+        struct device_node *codec_ep = of_graph_get_remote_endpoint(cpu_ep);
+        struct device_node *rcpu_ep = of_graph_get_remote_endpoint(codec_ep);
+        int ret;
+
+        if (rcpu_ep != cpu_ep) {
+                dev_err(dev, "remote-endpoint mismatch (%s/%s/%s)\n",
+                        cpu_ep->name, codec_ep->name, rcpu_ep->name);
+                ret = -EINVAL;
+                goto dai_link_of_err;
+        }
+
+        ret = asoc_simple_card_parse_daifmt(dev, cpu_ep, codec_ep,
+                                            NULL, &dai_link->dai_fmt);
+        if (ret < 0)
+                goto dai_link_of_err;
+
+        /*
+         * we need to consider "mclk-fs" around here
+         * see simple-card
+         */
+
+        ret = asoc_simple_card_parse_graph_cpu(cpu_ep, dai_link);
+        if (ret < 0)
+                goto dai_link_of_err;
+
+        ret = asoc_simple_card_parse_graph_codec(codec_ep, dai_link);
+        if (ret < 0)
+                goto dai_link_of_err;
+
+        ret = asoc_simple_card_of_parse_tdm(cpu_ep, cpu_dai);
+        if (ret < 0)
+                goto dai_link_of_err;
+
+        ret = asoc_simple_card_of_parse_tdm(codec_ep, codec_dai);
+        if (ret < 0)
+                goto dai_link_of_err;
+
+        ret = asoc_simple_card_parse_clk_cpu(dev, cpu_ep, dai_link, cpu_dai);
+        if (ret < 0)
+                goto dai_link_of_err;
+
+        ret = asoc_simple_card_parse_clk_codec(dev, codec_ep, dai_link, codec_dai);
+        if (ret < 0)
+                goto dai_link_of_err;
+
+        ret = asoc_simple_card_canonicalize_dailink(dai_link);
+        if (ret < 0)
+                goto dai_link_of_err;
+
+        ret = asoc_simple_card_set_dailink_name(dev, dai_link,
+                                                "%s-%s",
+                                                dai_link->cpu_dai_name,
+                                                dai_link->codec_dai_name);
+        if (ret < 0)
+                goto dai_link_of_err;
+
+        dai_link->ops = &asoc_graph_card_ops;
+        dai_link->init = asoc_graph_card_dai_init;
+
+        asoc_simple_card_canonicalize_cpu(dai_link,
+                of_graph_get_endpoint_count(dai_link->cpu_of_node) == 1);
+
+dai_link_of_err:
+        of_node_put(cpu_ep);
+        of_node_put(rcpu_ep);
+        of_node_put(codec_ep);
+
+        return ret;
+}
+
+static int asoc_graph_card_parse_of(struct graph_card_data *priv)
+{
+        struct of_phandle_iterator it;
+        struct device *dev = graph_priv_to_dev(priv);
+        struct snd_soc_card *card = graph_priv_to_card(priv);
+        struct device_node *node = dev->of_node;
+        int rc, idx = 0;
+        int ret;
+
+        ret = asoc_simple_card_of_parse_widgets(card, NULL);
+        if (ret < 0)
+                return ret;
+
+        ret = asoc_simple_card_of_parse_routing(card, NULL, 1);
+        if (ret < 0)
+                return ret;
+
+        /*
+         * we need to consider "mclk-fs" around here
+         * see simple-card
+         */
+
+        of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
+                ret = asoc_graph_card_dai_link_of(it.node, priv, idx++);
+                of_node_put(it.node);
+                if (ret < 0)
+                        return ret;
+        }
+
+        return asoc_simple_card_parse_card_name(card, NULL);
+}
+
+static int asoc_graph_get_dais_count(struct device *dev)
+{
+        struct of_phandle_iterator it;
+        struct device_node *node = dev->of_node;
+        int count = 0;
+        int rc;
+
+        of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
+                count++;
+                of_node_put(it.node);
+        }
+
+        return count;
+}
+
+static int asoc_graph_card_probe(struct platform_device *pdev)
+{
+        struct graph_card_data *priv;
+        struct snd_soc_dai_link *dai_link;
+        struct graph_dai_props *dai_props;
+        struct device *dev = &pdev->dev;
+        struct snd_soc_card *card;
+        int num, ret;
+
+        /* Allocate the private data and the DAI link array */
+        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        num = asoc_graph_get_dais_count(dev);
+        if (num == 0)
+                return -EINVAL;
+
+        dai_props = devm_kzalloc(dev, sizeof(*dai_props) * num, GFP_KERNEL);
+        dai_link  = devm_kzalloc(dev, sizeof(*dai_link)  * num, GFP_KERNEL);
+        if (!dai_props || !dai_link)
+                return -ENOMEM;
+
+        priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
+        if (IS_ERR(priv->pa_gpio)) {
+                ret = PTR_ERR(priv->pa_gpio);
+                dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
+                return ret;
+        }
+
+        priv->dai_props                 = dai_props;
+        priv->dai_link                  = dai_link;
+
+        /* Init snd_soc_card */
+        card = graph_priv_to_card(priv);
+        card->owner     = THIS_MODULE;
+        card->dev       = dev;
+        card->dai_link  = dai_link;
+        card->num_links = num;
+        card->dapm_widgets = asoc_graph_card_dapm_widgets;
+        card->num_dapm_widgets = ARRAY_SIZE(asoc_graph_card_dapm_widgets);
+
+        ret = asoc_graph_card_parse_of(priv);
+        if (ret < 0) {
+                if (ret != -EPROBE_DEFER)
+                        dev_err(dev, "parse error %d\n", ret);
+                goto err;
+        }
+
+        snd_soc_card_set_drvdata(card, priv);
+
+        ret = devm_snd_soc_register_card(dev, card);
+        if (ret < 0)
+                goto err;
+
+        return 0;
+err:
+        asoc_simple_card_clean_reference(card);
+
+        return ret;
+}
+
+static int asoc_graph_card_remove(struct platform_device *pdev)
+{
+        struct snd_soc_card *card = platform_get_drvdata(pdev);
+
+        return asoc_simple_card_clean_reference(card);
+}
+
+static const struct of_device_id asoc_graph_of_match[] = {
+        { .compatible = "audio-graph-card", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, asoc_graph_of_match);
+
+static struct platform_driver asoc_graph_card = {
+        .driver = {
+                .name = "asoc-audio-graph-card",
+                .of_match_table = asoc_graph_of_match,
+        },
+        .probe = asoc_graph_card_probe,
+        .remove = asoc_graph_card_remove,
+};
+module_platform_driver(asoc_graph_card);
+
+MODULE_ALIAS("platform:asoc-audio-graph-card");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("ASoC Audio Graph Sound Card");
+MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");