Make a function to get card number from card path

Make a function to get card number from card path, will be needed to
for added/removed card events.

Bug-AGL: SPEC-2749

Change-Id: Ic0cc6fd84a54432c696892772f2f66d1bde59a65
Signed-off-by: Jonathan Aillet <jonathan.aillet@iot.bzh>

2 files changed, 39 insertions, 22 deletions

diff --git a/alsa-binding/Alsa-ApiHat.h b/alsa-binding/Alsa-ApiHat.h
index 0300f3d..59a9b0c 100644
--- a/alsa-binding/Alsa-ApiHat.h
+++ b/alsa-binding/Alsa-ApiHat.h
@@ -90,6 +90,7 @@ extern const struct afb_binding_interface *afbIface;
 PUBLIC json_object *alsaCheckQuery (afb_req_t request, queryValuesT *queryValues);
 
 // AlseCoreSetGet exports
+PUBLIC int getCardNbFromCardPath(char *cardPath);
 PUBLIC json_object *getCardInfo(int card);
 PUBLIC int alsaGetSingleCtl (snd_ctl_t *ctlDev, snd_ctl_elem_id_t *elemId, ctlRequestT *ctlRequest, queryModeE queryMode);
 PUBLIC void alsaGetInfo (afb_req_t request);
diff --git a/alsa-binding/Alsa-SetGet.c b/alsa-binding/Alsa-SetGet.c
index e8c6563..8c189de 100644
--- a/alsa-binding/Alsa-SetGet.c
+++ b/alsa-binding/Alsa-SetGet.c
@@ -345,14 +345,43 @@ STATIC json_object *decodeTlv(unsigned int *tlv, unsigned int tlv_size, int mode
     return (decodeTlvJson);
 }
 
-STATIC int searchInQueryForAlsaCardToProbe(queryCardInfo *queryInfo, int *cardToProbe)
-{
-    int err, cardPathFileId;
+PUBLIC int getCardNbFromCardPath(char *cardPath) {
+    int err, cardPathFileFd, fileCardId;
 
     snd_ctl_card_info_t *currentCardInfo;
 
+    if (! cardPath)
+        return -1;
+
+    cardPathFileFd = open(cardPath, O_RDONLY);
+    if (cardPathFileFd < 0) {
+        AFB_ERROR("CardPath '%s' error %i during open", cardPath, cardPathFileFd);
+        return -2;
+    }
+
     snd_ctl_card_info_alloca(&currentCardInfo);
 
+    err = ioctl(cardPathFileFd, SNDRV_CTL_IOCTL_CARD_INFO(snd_ctl_card_info_sizeof()), currentCardInfo);
+    close(cardPathFileFd);
+    if (err < 0) {
+        AFB_ERROR("CardPath '%s' error %i during ioctl", cardPath, err);
+        return -3;
+    }
+
+    fileCardId = snd_ctl_card_info_get_card(currentCardInfo);
+
+    if (fileCardId < 0 || fileCardId >= MAX_SND_CARD) {
+        AFB_ERROR("CardPath '%s' returned an incorrect card number %i", cardPath, fileCardId);
+        return -4;
+    }
+
+    return fileCardId;
+}
+
+STATIC int searchInQueryForAlsaCardToProbe(queryCardInfo *queryInfo, int *cardToProbe)
+{
+    int err;
+
     if(! queryInfo) {
         AFB_ERROR("Structure to look for an ALSA card is NULL");
         return -1;
@@ -381,31 +410,18 @@ STATIC int searchInQueryForAlsaCardToProbe(queryCardInfo *queryInfo, int *cardTo
     }
 
     if(queryInfo->cardPath) {
-        cardPathFileId = open(queryInfo->cardPath, O_RDONLY);
-        if(cardPathFileId < 0) {
-            AFB_ERROR("CardPath '%s' error %i during open", queryInfo->cardPath, cardPathFileId);
-            return -4;
-        }
+        *cardToProbe = getCardNbFromCardPath(queryInfo->cardPath);
 
-        err = ioctl(cardPathFileId, SNDRV_CTL_IOCTL_CARD_INFO(snd_ctl_card_info_sizeof()), currentCardInfo);
-        close(cardPathFileId);
-
-        *cardToProbe = snd_ctl_card_info_get_card(currentCardInfo);
-
-        if(err < 0) {
-            AFB_ERROR("CardPath '%s' error %i during ioctl", queryInfo->cardPath, err);
-            return -5;
-        }
-        else if(*cardToProbe < 0 || *cardToProbe >= MAX_SND_CARD) {
+        if(*cardToProbe < 0 || *cardToProbe >= MAX_SND_CARD) {
             AFB_ERROR("CardPath '%s' returned an incorrect card number %i", queryInfo->cardPath, *cardToProbe);
-            return -6;
+            return -4;
         }
         else if(queryInfo->cardNb != NO_CARD_SELECTED && *cardToProbe != queryInfo->cardNb) {
             AFB_WARNING("CardPath '%s' (id %i) is not corresponding to the requested card number %i",
                         queryInfo->cardPath,
                         *cardToProbe,
                         queryInfo->cardNb);
-            return -7;
+            return -5;
         }
 
         queryInfo->cardNb = *cardToProbe;
@@ -417,12 +433,12 @@ STATIC int searchInQueryForAlsaCardToProbe(queryCardInfo *queryInfo, int *cardTo
     err = snd_card_next(cardToProbe);
     if(err < 0) {
         AFB_ERROR("Error %i happened when tried to get next ALSA card number", err);
-        return -8;
+        return -6;
     }
 
     if(*cardToProbe < 0) {
         AFB_NOTICE("No ALSA card connected");
-        return -9;
+        return -7;
     }
 
     return 1;