[PATCH v2] ASoC: simple-card-utils: introduce asoc_simple_parse_triggers()

[Maxim Kochetkov <fido_max@inbox.ru>]

This function parses DT DAI link triggers params and assigns
the appropriate fields in struct snd_soc_dai_link.
It supports two triggers trigger-stop and trigger-start.

Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
---
 include/sound/simple_card_utils.h     |  3 ++
 sound/soc/generic/simple-card-utils.c | 45 +++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h
index b450d5873227..ea8c17f7b280 100644
--- a/include/sound/simple_card_utils.h
+++ b/include/sound/simple_card_utils.h
@@ -180,6 +180,9 @@ int asoc_simple_parse_widgets(struct snd_soc_card *card,
 				      char *prefix);
 int asoc_simple_parse_pin_switches(struct snd_soc_card *card,
 				   char *prefix);
+int asoc_simple_parse_triggers(struct device_node *node,
+			       char *prefix,
+			       struct snd_soc_dai_link *dai_link);
 
 int asoc_simple_init_jack(struct snd_soc_card *card,
 			       struct asoc_simple_jack *sjack,
diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index 3019626b0592..58f5c672184a 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -737,6 +737,51 @@ int asoc_simple_parse_pin_switches(struct snd_soc_card *card,
 }
 EXPORT_SYMBOL_GPL(asoc_simple_parse_pin_switches);
 
+static enum snd_soc_trigger_order asoc_simple_parse_trigger(
+					struct device_node *node,
+					char *prefix,
+					char *trigger_name)
+{
+	enum snd_soc_trigger_order trigger = SND_SOC_TRIGGER_ORDER_DEFAULT;
+	struct {
+		char *name;
+		unsigned int val;
+	} of_trigger_table[] = {
+		{ "default",	SND_SOC_TRIGGER_ORDER_DEFAULT },
+		{ "ldc",	SND_SOC_TRIGGER_ORDER_LDC },
+	};
+	const char *str;
+	char prop[128];
+	int ret;
+
+	if (!prefix)
+		prefix = "";
+
+	snprintf(prop, sizeof(prop), "%s%s", prefix, trigger_name);
+
+	ret = of_property_read_string(node, prop, &str);
+	if (ret == 0) {
+		for (int i = 0; i < ARRAY_SIZE(of_trigger_table); i++) {
+			if (strcmp(str, of_trigger_table[i].name) == 0) {
+				trigger = of_trigger_table[i].val;
+				break;
+			}
+		}
+	}
+
+	return trigger;
+}
+
+int asoc_simple_parse_triggers(struct device_node *node,
+			       char *prefix,
+			       struct snd_soc_dai_link *dai_link)
+{
+	dai_link->trigger_stop = asoc_simple_parse_trigger(node, prefix, "trigger-stop");
+	dai_link->trigger_start = asoc_simple_parse_trigger(node, prefix, "trigger-start");
+	return 0;
+}
+EXPORT_SYMBOL_GPL(asoc_simple_parse_triggers);
+
 int asoc_simple_init_jack(struct snd_soc_card *card,
 			  struct asoc_simple_jack *sjack,
 			  int is_hp, char *prefix,
-- 
2.40.1