ucm: implement disdevall sequence command

It is useful to run all disable sequences for all
UCM devices in a verb to ensure the valid, expected
initial state.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>

src/ucm/main.c

@@ -694,6 +694,31 @@ static int run_device_sequence(snd_use_case_mgr_t *uc_mgr, struct use_case_verb
 				&uc_mgr->value_list);
 }
 
+static int run_device_all_sequence(snd_use_case_mgr_t *uc_mgr, struct use_case_verb *verb)
+{
+	struct use_case_device *device;
+	struct list_head *pos;
+	int err;
+
+	if (verb == NULL) {
+		uc_error("error: disdevall must be executed inside the verb context");
+		return -ENOENT;
+	}
+
+	list_for_each(pos, &verb->device_list) {
+		device = list_entry(pos, struct use_case_device, list);
+
+		err = execute_sequence(uc_mgr, verb,
+					&device->disable_list,
+					&device->value_list,
+					&verb->value_list,
+					&uc_mgr->value_list);
+		if (err < 0)
+			return err;
+	}
+	return 0;
+}
+
 /**
  * \brief Execute the sequence
  * \param uc_mgr Use case manager
@@ -866,6 +891,11 @@ shell_retry:
 			if (err < 0)
 				goto __fail;
 			break;
+		case SEQUENCE_ELEMENT_TYPE_DEV_DISABLE_ALL:
+			err = run_device_all_sequence(uc_mgr, verb);
+			if (err < 0)
+				goto __fail;
+			break;
 		default:
 			uc_error("unknown sequence command %i", s->type);
 			break;

src/ucm/parser.c

@@ -1106,6 +1106,11 @@ device:
 			continue;
 		}
 
+		if (strcmp(cmd, "disdevall") == 0) {
+			curr->type = SEQUENCE_ELEMENT_TYPE_DEV_DISABLE_ALL;
+			continue;
+		}
+
 		if (strcmp(cmd, "cset-bin-file") == 0) {
 			curr->type = SEQUENCE_ELEMENT_TYPE_CSET_BIN_FILE;
 			goto cset;

src/ucm/ucm_confdoc.h

@@ -222,8 +222,9 @@ SectionModifier."Capture Voice" {
 
 Command name   | Description
 ---------------|----------------------------------------------
-enadev2        | execute device enable sequence
+enadev2 ARG    | execute device enable sequence
-disdev2        | execute device disable sequence
+disdev2 ARG    | execute device disable sequence
+disdevall ""   | execute device disable sequence for all devices in verb
 cdev ARG       | ALSA control device name for snd_ctl_open()
 cset ARG       | ALSA control set - snd_ctl_ascii_elem_id_parse() + snd_ctl_ascii_value_parse()
 cset-new ARG   | Create new ALSA user control element - snd_ctl_ascii_elem_id_parse() + description

src/ucm/ucm_local.h

@@ -59,6 +59,7 @@
 #define SEQUENCE_ELEMENT_TYPE_CFGSAVE		12
 #define SEQUENCE_ELEMENT_TYPE_DEV_ENABLE_SEQ	13
 #define SEQUENCE_ELEMENT_TYPE_DEV_DISABLE_SEQ	14
+#define SEQUENCE_ELEMENT_TYPE_DEV_DISABLE_ALL	15
 
 struct ucm_value {
         struct list_head list;