--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+//
+// ASoC Audio Graph Card2 support
+//
+// Copyright (C) 2020 Renesas Electronics Corp.
+// Copyright (C) 2020 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+//
+// based on ${LINUX}/sound/soc/generic/audio-graph-card.c
+#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/graph_card.h>
+
+/************************************
+ daifmt
+ ************************************
+ ports {
+ format = "left_j";
+ port@0 {
+ bitclock-master;
+ sample0: endpoint@0 {
+ frame-master;
+ };
+ sample1: endpoint@1 {
+ format = "i2s";
+ };
+ };
+ ...
+ };
+
+ You can set daifmt at ports/port/endpoint.
+ It uses *latest* format, and *share* master settings.
+ In above case,
+ sample0: left_j, bitclock-master, frame-master
+ sample1: i2s, bitclock-master
+
+ If there was no settings, *Codec* will be
+ bitclock/frame provider as default.
+ see
+ graph_parse_daifmt().
+
+ ************************************
+ Normal Audio-Graph
+ ************************************
+
+ CPU <---> Codec
+
+ sound {
+ compatible = "audio-graph-card2";
+ links = <&cpu>;
+ };
+
+ CPU {
+ cpu: port {
+ bitclock-master;
+ frame-master;
+ cpu_ep: endpoint { remote-endpoint = <&codec_ep>; }; };
+ };
+
+ Codec {
+ port { codec_ep: endpoint { remote-endpoint = <&cpu_ep>; }; };
+ };
+
+*/
+
+enum graph_type {
+ GRAPH_NORMAL,
+};
+
+#define port_to_endpoint(port) of_get_child_by_name(port, "endpoint")
+
+static enum graph_type graph_get_type(struct asoc_simple_priv *priv,
+ struct device_node *lnk)
+{
+ enum graph_type type = GRAPH_NORMAL;
+
+#ifdef DEBUG
+ {
+ struct device *dev = simple_priv_to_dev(priv);
+ const char *str = "Normal";
+
+ dev_dbg(dev, "%pOF (%s)", lnk, str);
+ }
+#endif
+ return type;
+}
+
+static const struct snd_soc_ops graph_ops = {
+ .startup = asoc_simple_startup,
+ .shutdown = asoc_simple_shutdown,
+ .hw_params = asoc_simple_hw_params,
+};
+
+static int graph_get_dai_id(struct device_node *ep)
+{
+ struct device_node *node;
+ struct device_node *endpoint;
+ struct of_endpoint info;
+ int i, id;
+ const u32 *reg;
+ int ret;
+
+ /* use driver specified DAI ID if exist */
+ ret = snd_soc_get_dai_id(ep);
+ if (ret != -ENOTSUPP)
+ return ret;
+
+ /* use endpoint/port reg if exist */
+ ret = of_graph_parse_endpoint(ep, &info);
+ if (ret == 0) {
+ /*
+ * Because it will count port/endpoint if it doesn't have "reg".
+ * But, we can't judge whether it has "no reg", or "reg = <0>"
+ * only of_graph_parse_endpoint().
+ * We need to check "reg" property
+ */
+ if (of_get_property(ep, "reg", NULL))
+ return info.id;
+
+ node = of_get_parent(ep);
+ reg = of_get_property(node, "reg", NULL);
+ of_node_put(node);
+ if (reg)
+ return info.port;
+ }
+ node = of_graph_get_port_parent(ep);
+
+ /*
+ * Non HDMI sound case, counting port/endpoint on its DT
+ * is enough. Let's count it.
+ */
+ i = 0;
+ id = -1;
+ for_each_endpoint_of_node(node, endpoint) {
+ if (endpoint == ep)
+ id = i;
+ i++;
+ }
+
+ of_node_put(node);
+
+ if (id < 0)
+ return -ENODEV;
+
+ return id;
+}
+
+static int asoc_simple_parse_dai(struct device_node *ep,
+ struct snd_soc_dai_link_component *dlc,
+ int *is_single_link)
+{
+ struct device_node *node;
+ struct of_phandle_args args;
+ int ret;
+
+ if (!ep)
+ return 0;
+
+ node = of_graph_get_port_parent(ep);
+
+ /* Get dai->name */
+ args.np = node;
+ args.args[0] = graph_get_dai_id(ep);
+ args.args_count = (of_graph_get_endpoint_count(node) > 1);
+
+ /*
+ * FIXME
+ *
+ * Here, dlc->dai_name is pointer to CPU/Codec DAI name.
+ * If user unbinded CPU or Codec driver, but not for Sound Card,
+ * dlc->dai_name is keeping unbinded CPU or Codec
+ * driver's pointer.
+ *
+ * If user re-bind CPU or Codec driver again, ALSA SoC will try
+ * to rebind Card via snd_soc_try_rebind_card(), but because of
+ * above reason, it might can't bind Sound Card.
+ * Because Sound Card is pointing to released dai_name pointer.
+ *
+ * To avoid this rebind Card issue,
+ * 1) It needs to alloc memory to keep dai_name eventhough
+ * CPU or Codec driver was unbinded, or
+ * 2) user need to rebind Sound Card everytime
+ * if he unbinded CPU or Codec.
+ */
+ ret = snd_soc_get_dai_name(&args, &dlc->dai_name);
+ if (ret < 0)
+ return ret;
+
+ dlc->of_node = node;
+
+ if (is_single_link)
+ *is_single_link = of_graph_get_endpoint_count(node) == 1;
+
+ return 0;
+}
+
+static void graph_parse_mclk_fs(struct device_node *ep,
+ struct simple_dai_props *props)
+{
+ struct device_node *port = of_get_parent(ep);
+ struct device_node *ports = of_get_parent(port);
+
+ if (of_node_name_eq(ports, "ports"))
+ of_property_read_u32(ports, "mclk-fs", &props->mclk_fs);
+ of_property_read_u32(port, "mclk-fs", &props->mclk_fs);
+ of_property_read_u32(ep, "mclk-fs", &props->mclk_fs);
+
+ of_node_put(port);
+ of_node_put(ports);
+}
+
+static int __graph_parse_node(struct asoc_simple_priv *priv,
+ enum graph_type gtype,
+ struct device_node *ep,
+ struct link_info *li,
+ int is_cpu, int idx)
+{
+ struct device *dev = simple_priv_to_dev(priv);
+ struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
+ struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
+ struct snd_soc_dai_link_component *dlc;
+ struct asoc_simple_dai *dai;
+ int ret, is_single_links = 0;
+
+ if (is_cpu) {
+ dlc = asoc_link_to_cpu(dai_link, idx);
+ dai = simple_props_to_dai_cpu(dai_props, idx);
+ } else {
+ dlc = asoc_link_to_codec(dai_link, idx);
+ dai = simple_props_to_dai_codec(dai_props, idx);
+ }
+
+ graph_parse_mclk_fs(ep, dai_props);
+
+ ret = asoc_simple_parse_dai(ep, dlc, &is_single_links);
+ if (ret < 0)
+ return ret;
+
+ ret = asoc_simple_parse_tdm(ep, dai);
+ if (ret < 0)
+ return ret;
+
+ ret = asoc_simple_parse_clk(dev, ep, dai, dlc);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * set DAI Name
+ */
+ if (!dai_link->name) {
+ struct snd_soc_dai_link_component *cpus = dlc;
+ struct snd_soc_dai_link_component *codecs = asoc_link_to_codec(dai_link, idx);
+
+ switch (gtype) {
+ case GRAPH_NORMAL:
+ /* run is_cpu only. see audio_graph2_link_normal() */
+ if (is_cpu)
+ asoc_simple_set_dailink_name(dev, dai_link, "%s-%s",
+ cpus->dai_name, codecs->dai_name);
+ break;
+ default:
+ break;
+ }
+ }
+
+ if (is_cpu) {
+ struct snd_soc_dai_link_component *cpus = dlc;
+ struct snd_soc_dai_link_component *platforms = asoc_link_to_platform(dai_link, idx);
+
+ asoc_simple_canonicalize_cpu(cpus, is_single_links);
+ asoc_simple_canonicalize_platform(platforms, cpus);
+ }
+
+ return 0;
+}
+
+static int graph_parse_node(struct asoc_simple_priv *priv,
+ enum graph_type gtype,
+ struct device_node *port,
+ struct link_info *li, int is_cpu)
+{
+ struct device_node *ep = port_to_endpoint(port);
+
+ /* Need Multi support later */
+ return __graph_parse_node(priv, gtype, ep, li, is_cpu, 0);
+}
+
+static void graph_parse_daifmt(struct device_node *node,
+ unsigned int *daifmt, unsigned int *bit_frame)
+{
+ unsigned int fmt;
+
+ /*
+ * see also above "daifmt" explanation
+ * and samples.
+ */
+
+ /*
+ * ports {
+ * (A)
+ * port {
+ * (B)
+ * endpoint {
+ * (C)
+ * };
+ * };
+ * };
+ * };
+ */
+
+ /*
+ * clock_provider:
+ *
+ * It can be judged it is provider
+ * if (A) or (B) or (C) has bitclock-master / frame-master flag.
+ *
+ * use "or"
+ */
+ *bit_frame |= snd_soc_daifmt_parse_clock_provider_as_bitmap(node, NULL);
+
+#define update_daifmt(name) \
+ if (!(*daifmt & SND_SOC_DAIFMT_##name##_MASK) && \
+ (fmt & SND_SOC_DAIFMT_##name##_MASK)) \
+ *daifmt |= fmt & SND_SOC_DAIFMT_##name##_MASK
+
+ /*
+ * format
+ *
+ * This function is called by (C) -> (B) -> (A) order.
+ * Set if applicable part was not yet set.
+ */
+ fmt = snd_soc_daifmt_parse_format(node, NULL);
+ update_daifmt(FORMAT);
+ update_daifmt(CLOCK);
+ update_daifmt(INV);
+}
+
+static void graph_link_init(struct asoc_simple_priv *priv,
+ struct device_node *port,
+ struct link_info *li,
+ int is_cpu_node)
+{
+ struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
+ struct device_node *ep;
+ struct device_node *ports;
+ unsigned int daifmt = 0, daiclk = 0;
+ unsigned int bit_frame = 0;
+
+ /* Need Multi support later */
+ ep = port_to_endpoint(port);
+ ports = of_get_parent(port);
+
+ /*
+ * ports {
+ * (A)
+ * port {
+ * (B)
+ * endpoint {
+ * (C)
+ * };
+ * };
+ * };
+ * };
+ */
+ graph_parse_daifmt(ep, &daifmt, &bit_frame); /* (C) */
+ graph_parse_daifmt(port, &daifmt, &bit_frame); /* (B) */
+ if (of_node_name_eq(ports, "ports"))
+ graph_parse_daifmt(ports, &daifmt, &bit_frame); /* (A) */
+
+ /*
+ * convert bit_frame
+ * We need to flip clock_provider if it was CPU node,
+ * because it is Codec base.
+ */
+ daiclk = snd_soc_daifmt_clock_provider_from_bitmap(bit_frame);
+ if (is_cpu_node)
+ daiclk = snd_soc_daifmt_clock_provider_fliped(daiclk);
+
+ dai_link->dai_fmt = daifmt | daiclk;
+ dai_link->init = asoc_simple_dai_init;
+ dai_link->ops = &graph_ops;
+ if (priv->ops)
+ dai_link->ops = priv->ops;
+}
+
+int audio_graph2_link_normal(struct asoc_simple_priv *priv,
+ struct device_node *lnk,
+ struct link_info *li)
+{
+ struct device_node *cpu_port = lnk;
+ struct device_node *cpu_ep = port_to_endpoint(cpu_port);
+ struct device_node *codec_port = of_graph_get_remote_port(cpu_ep);
+ int ret;
+
+ /*
+ * call Codec first.
+ * see
+ * __graph_parse_node() :: DAI Naming
+ */
+ ret = graph_parse_node(priv, GRAPH_NORMAL, codec_port, li, 0);
+ if (ret < 0)
+ goto err;
+
+ /*
+ * call CPU, and set DAI Name
+ */
+ ret = graph_parse_node(priv, GRAPH_NORMAL, cpu_port, li, 1);
+ if (ret < 0)
+ goto err;
+
+ graph_link_init(priv, cpu_port, li, 1);
+err:
+ of_node_put(codec_port);
+ of_node_put(cpu_ep);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(audio_graph2_link_normal);
+
+static int graph_link(struct asoc_simple_priv *priv,
+ struct graph2_custom_hooks *hooks,
+ enum graph_type gtype,
+ struct device_node *lnk,
+ struct link_info *li)
+{
+ struct device *dev = simple_priv_to_dev(priv);
+ GRAPH2_CUSTOM func = NULL;
+ int ret = -EINVAL;
+
+ switch (gtype) {
+ case GRAPH_NORMAL:
+ if (hooks && hooks->custom_normal)
+ func = hooks->custom_normal;
+ else
+ func = audio_graph2_link_normal;
+ break;
+ default:
+ break;
+ }
+
+ if (!func) {
+ dev_err(dev, "non supported gtype (%d)\n", gtype);
+ goto err;
+ }
+
+ ret = func(priv, lnk, li);
+ if (ret < 0)
+ goto err;
+
+ li->link++;
+err:
+ return ret;
+}
+
+static int graph_counter(struct device_node *lnk)
+{
+ /* Need Multi support later */
+ return 1;
+}
+
+static int graph_count_normal(struct asoc_simple_priv *priv,
+ struct device_node *lnk,
+ struct link_info *li)
+{
+ struct device_node *cpu_port = lnk;
+ struct device_node *cpu_ep = port_to_endpoint(cpu_port);
+ struct device_node *codec_port = of_graph_get_remote_port(cpu_ep);
+
+ /*
+ * CPU {
+ * => lnk: port { endpoint { .. }; };
+ * };
+ */
+ li->num[li->link].cpus =
+ li->num[li->link].platforms = graph_counter(cpu_port);
+ li->num[li->link].codecs = graph_counter(codec_port);
+
+ of_node_put(cpu_ep);
+ of_node_put(codec_port);
+
+ return 0;
+}
+
+static int graph_count(struct asoc_simple_priv *priv,
+ struct graph2_custom_hooks *hooks,
+ enum graph_type gtype,
+ struct device_node *lnk,
+ struct link_info *li)
+{
+ struct device *dev = simple_priv_to_dev(priv);
+ GRAPH2_CUSTOM func = NULL;
+ int ret = -EINVAL;
+
+ if (li->link >= SNDRV_MAX_LINKS) {
+ dev_err(dev, "too many links\n");
+ return ret;
+ }
+
+ switch (gtype) {
+ case GRAPH_NORMAL:
+ func = graph_count_normal;
+ break;
+ default:
+ break;
+ }
+
+ if (!func) {
+ dev_err(dev, "non supported gtype (%d)\n", gtype);
+ goto err;
+ }
+
+ ret = func(priv, lnk, li);
+ if (ret < 0)
+ goto err;
+
+ li->link++;
+err:
+ return ret;
+}
+
+static int graph_for_each_link(struct asoc_simple_priv *priv,
+ struct graph2_custom_hooks *hooks,
+ struct link_info *li,
+ int (*func)(struct asoc_simple_priv *priv,
+ struct graph2_custom_hooks *hooks,
+ enum graph_type gtype,
+ struct device_node *lnk,
+ struct link_info *li))
+{
+ struct of_phandle_iterator it;
+ struct device *dev = simple_priv_to_dev(priv);
+ struct device_node *node = dev->of_node;
+ struct device_node *lnk;
+ enum graph_type gtype;
+ int rc, ret;
+
+ /* loop for all listed CPU port */
+ of_for_each_phandle(&it, rc, node, "links", NULL, 0) {
+ lnk = it.node;
+
+ gtype = graph_get_type(priv, lnk);
+
+ ret = func(priv, hooks, gtype, lnk, li);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+int audio_graph2_parse_of(struct asoc_simple_priv *priv, struct device *dev,
+ struct graph2_custom_hooks *hooks)
+{
+ struct snd_soc_card *card = simple_priv_to_card(priv);
+ struct link_info *li;
+ int ret;
+
+ dev_warn(dev, "Audio Graph Card2 is still under Experimental stage\n");
+
+ li = devm_kzalloc(dev, sizeof(*li), GFP_KERNEL);
+ if (!li)
+ return -ENOMEM;
+
+ card->probe = asoc_graph_card_probe;
+ card->owner = THIS_MODULE;
+ card->dev = dev;
+
+ if ((hooks) && (hooks)->hook_pre) {
+ ret = (hooks)->hook_pre(priv);
+ if (ret < 0)
+ goto err;
+ }
+
+ ret = graph_for_each_link(priv, hooks, li, graph_count);
+ if (!li->link)
+ ret = -EINVAL;
+ if (ret < 0)
+ goto err;
+
+ ret = asoc_simple_init_priv(priv, li);
+ if (ret < 0)
+ goto err;
+
+ 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);
+ goto err;
+ }
+
+ ret = asoc_simple_parse_widgets(card, NULL);
+ if (ret < 0)
+ goto err;
+
+ ret = asoc_simple_parse_routing(card, NULL);
+ if (ret < 0)
+ goto err;
+
+ memset(li, 0, sizeof(*li));
+ ret = graph_for_each_link(priv, hooks, li, graph_link);
+ if (ret < 0)
+ goto err;
+
+ ret = asoc_simple_parse_card_name(card, NULL);
+ if (ret < 0)
+ goto err;
+
+ snd_soc_card_set_drvdata(card, priv);
+
+ if ((hooks) && (hooks)->hook_post) {
+ ret = (hooks)->hook_post(priv);
+ if (ret < 0)
+ goto err;
+ }
+
+ asoc_simple_debug_info(priv);
+
+ ret = devm_snd_soc_register_card(dev, card);
+err:
+ devm_kfree(dev, li);
+
+ if ((ret < 0) && (ret != -EPROBE_DEFER))
+ dev_err(dev, "parse error %d\n", ret);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(audio_graph2_parse_of);
+
+static int graph_probe(struct platform_device *pdev)
+{
+ struct asoc_simple_priv *priv;
+ struct device *dev = &pdev->dev;
+
+ /* Allocate the private data and the DAI link array */
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ return audio_graph2_parse_of(priv, dev, NULL);
+}
+
+static const struct of_device_id graph_of_match[] = {
+ { .compatible = "audio-graph-card2", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, graph_of_match);
+
+static struct platform_driver graph_card = {
+ .driver = {
+ .name = "asoc-audio-graph-card2",
+ .pm = &snd_soc_pm_ops,
+ .of_match_table = graph_of_match,
+ },
+ .probe = graph_probe,
+ .remove = asoc_simple_remove,
+};
+module_platform_driver(graph_card);
+
+MODULE_ALIAS("platform:asoc-audio-graph-card2");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("ASoC Audio Graph Card2");
+MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
projects / platform / kernel / linux-rpi.git / commitdiff