From 1ad182507669008875860ecda8b00ac564bcbe6e Mon Sep 17 00:00:00 2001
From: Jaroslav Kysela <perex@perex.cz>
Date: Thu, 4 Dec 2025 15:06:39 +0100
Subject: [PATCH] alsactl: ucm: restore controls for other cards in group

When the primary card restores controls, all other cards
in the card group should do this operation, too.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---
 alsactl/alsactl.h     |  1 +
 alsactl/boot_params.c |  2 ++
 alsactl/state.c       | 43 ++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/alsactl/alsactl.h b/alsactl/alsactl.h
index 994485a..2aefb89 100644
--- a/alsactl/alsactl.h
+++ b/alsactl/alsactl.h
@@ -98,6 +98,7 @@ int state_daemon(const char *file, const char *cardname, int period,
 int state_daemon_kill(const char *pidfile, const char *cmd);
 int clean(const char *cardname, char *const *extra_args);
 int snd_card_clean_cfgdir(const char *cfgdir, int cardno);
+void add_linked_card(int cardno);
 
 /* export */
 
diff --git a/alsactl/boot_params.c b/alsactl/boot_params.c
index 736597e..f44526a 100644
--- a/alsactl/boot_params.c
+++ b/alsactl/boot_params.c
@@ -893,6 +893,8 @@ static void boot_params_update_restored(snd_config_t *card_compound, int skip_ca
 			goto _next;
 		}
 
+		add_linked_card(card_val);
+
 _next:
 		snd_ctl_close(handle);
 	}
diff --git a/alsactl/state.c b/alsactl/state.c
index c6a1630..2942f3f 100644
--- a/alsactl/state.c
+++ b/alsactl/state.c
@@ -29,6 +29,33 @@
 #include <errno.h>
 #include "alsactl.h"
 
+static int linked_cards[16];
+
+static void init_linked_cards(void)
+{
+	size_t index;
+
+	for (index = 0; index < ARRAY_SIZE(linked_cards); index++)
+		linked_cards[index] = -1;
+}
+
+void add_linked_card(int cardno)
+{
+	size_t index;
+
+	for (index = 0; index < ARRAY_SIZE(linked_cards); index++) {
+		if (linked_cards[index] == cardno)
+			return;
+	}
+
+	for (index = 0; index < ARRAY_SIZE(linked_cards); index++) {
+		if (linked_cards[index] < 0) {
+			linked_cards[index] = cardno;
+			return;
+		}
+	}
+	error("Too many linked cards!");
+}
 
 static char *id_str(snd_ctl_elem_id_t *id)
 {
@@ -1703,10 +1730,11 @@ int load_state(const char *cfgdir, const char *file,
 	       const char *initfile, int initflags,
 	       const char *cardname, int do_init)
 {
-	int err, finalerr = 0, open_failed, lock_fd;
+	int err, finalerr = 0, open_failed, lock_fd, cardno;
 	struct snd_card_iterator iter;
 	snd_config_t *config;
 	const char *cardname1;
+	size_t index;
 
 	config = NULL;
 	err = load_configuration(file, &config, &open_failed);
@@ -1723,6 +1751,7 @@ int load_state(const char *cfgdir, const char *file,
 		while ((cardname1 = snd_card_iterator_next(&iter)) != NULL) {
 			if (!do_init)
 				break;
+			init_linked_cards();
 			if (initflags & FLAG_UCM_WAIT)
 				wait_for_card(-1, iter.card);
 			lock_fd = card_lock(iter.card, LOCK_TIMEOUT);
@@ -1752,6 +1781,7 @@ int load_state(const char *cfgdir, const char *file,
 	if (err < 0)
 		goto out;
 	while ((cardname1 = snd_card_iterator_next(&iter)) != NULL) {
+		init_linked_cards();
 		if (initflags & FLAG_UCM_WAIT)
 			wait_for_card(-1, iter.card);
 		lock_fd = card_lock(iter.card, LOCK_TIMEOUT);
@@ -1780,6 +1810,17 @@ int load_state(const char *cfgdir, const char *file,
 				finalerr = err;
 			initfailed(iter.card, "restore", err);
 		}
+		/* for linked cards, restore controls, too */
+		for (index = 0; index < ARRAY_SIZE(linked_cards); index++) {
+			if ((cardno = linked_cards[index]) < 0)
+				break;
+			dbg("Restore for linked card %d", cardno);
+			if ((err = set_controls(cardno, config, 1))) {
+				if (!force_restore)
+					finalerr = err;
+				initfailed(cardno, "restore", err);
+			}
+		}
 unlock_card:
 		card_unlock(lock_fd, iter.card);
 	}
-- 
2.47.3