From 1f2d8e47aba1b9e6ffeb11c73637c0ecdde85034 Mon Sep 17 00:00:00 2001
From: Jaroslav Kysela <perex@perex.cz>
Date: Mon, 3 Nov 2003 10:43:32 +0000
Subject: [PATCH] Clemens Ladisch <clemens@ladisch.de> - add error handler for
 ALSA errors - enumerate all controls to find the desired control   (because
 SPDIF is device 1 on ymfpci)

---
 iecset/iecset.c | 63 ++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 47 insertions(+), 16 deletions(-)

diff --git a/iecset/iecset.c b/iecset/iecset.c
index 03f812f..d8c063f 100644
--- a/iecset/iecset.c
+++ b/iecset/iecset.c
@@ -76,6 +76,12 @@ static struct cmdtbl cmds[] = {
 };
 
 
+static void error(const char *s, int err)
+{
+	fprintf(stderr, "%s: %s\n", s, snd_strerror(err));
+}
+
+
 static void usage(void)
 {
 	int i;
@@ -279,13 +285,16 @@ static int update_iec958_status(snd_aes_iec958_t *iec958, int *parms)
 int main(int argc, char **argv)
 {
 	const char *dev = "default";
-	const char *spdif_str = "IEC958 Playback Default";
+	const char *spdif_str = SND_CTL_NAME_IEC958("", PLAYBACK, DEFAULT);
 	snd_ctl_t *ctl;
+	snd_ctl_elem_list_t *clist;
+	snd_ctl_elem_id_t *cid;
 	snd_ctl_elem_value_t *cval;
 	snd_aes_iec958_t iec958;
 	int from_stdin = 0;
 	int dumphex = 0;
-	int i, c;
+	int i, c, err;
+	unsigned int controls, cidx;
 	char tmpname[32];
 	int parms[IDX_LAST];
 
@@ -318,20 +327,42 @@ int main(int argc, char **argv)
 		}
 	}
 
-	if (snd_ctl_open(&ctl, dev, 0) < 0) {
-		perror("snd_ctl_open");
+	if ((err = snd_ctl_open(&ctl, dev, 0)) < 0) {
+		error("snd_ctl_open", err);
 		return 1;
 	}
 
+	snd_ctl_elem_list_alloca(&clist);
+	if ((err = snd_ctl_elem_list(ctl, clist)) < 0) {
+		error("snd_ctl_elem_list", err);
+		return 1;
+	}
+	if ((err = snd_ctl_elem_list_alloc_space(clist, snd_ctl_elem_list_get_count(clist))) < 0) {
+		error("snd_ctl_elem_list_alloc_space", err);
+		return 1;
+	}
+	if ((err = snd_ctl_elem_list(ctl, clist)) < 0) {
+		error("snd_ctl_elem_list", err);
+		return 1;
+	}
+
+	controls = snd_ctl_elem_list_get_used(clist);
+	for (cidx = 0; cidx < controls; cidx++) {
+		if (!strcmp(snd_ctl_elem_list_get_name(clist, cidx), spdif_str))
+			break;
+	}
+	if (cidx >= controls) {
+		fprintf(stderr, "control \"%s\" not found\n", spdif_str);
+		return 1;
+	}
+
+	snd_ctl_elem_id_alloca(&cid);
+	snd_ctl_elem_list_get_id(clist, cidx, cid);
 	snd_ctl_elem_value_alloca(&cval);
-	snd_ctl_elem_value_set_interface(cval, SND_CTL_ELEM_IFACE_MIXER);
-	snd_ctl_elem_value_set_name(cval, spdif_str);
-	if (snd_ctl_elem_read(ctl, cval) < 0) {
-		snd_ctl_elem_value_set_interface(cval, SND_CTL_ELEM_IFACE_PCM);
-		if (snd_ctl_elem_read(ctl, cval) < 0) {
-			perror("snd_ctl_elem_read");
-			return 1;
-		}
+	snd_ctl_elem_value_set_id(cval, cid);
+	if ((err = snd_ctl_elem_read(ctl, cval)) < 0) {
+		error("snd_ctl_elem_read", err);
+		return 1;
 	}
 
 	snd_ctl_elem_value_get_iec958(cval, &iec958);
@@ -347,12 +378,12 @@ int main(int argc, char **argv)
 	if (update_iec958_status(&iec958, parms)) {
 		/* store the values */
 		snd_ctl_elem_value_set_iec958(cval, &iec958);
-		if (snd_ctl_elem_write(ctl, cval) < 0) {
-			perror("snd_ctl_elem_write");
+		if ((err = snd_ctl_elem_write(ctl, cval)) < 0) {
+			error("snd_ctl_elem_write", err);
 			return 1;
 		}
-		if (snd_ctl_elem_read(ctl, cval) < 0) {
-			perror("snd_ctl_elem_write");
+		if ((err = snd_ctl_elem_read(ctl, cval)) < 0) {
+			error("snd_ctl_elem_write", err);
 			return 1;
 		}
 		snd_ctl_elem_value_get_iec958(cval, &iec958);