1 files changed, 69 insertions, 30 deletions

diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 8928ca871c22..6e4bfcc14254 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -650,7 +650,7 @@ int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
         pstr->stream = stream;
         pstr->pcm = pcm;
         pstr->substream_count = substream_count;
-        if (substream_count > 0) {
+        if (substream_count > 0 && !pcm->internal) {
                 err = snd_pcm_stream_proc_init(pstr);
                 if (err < 0) {
                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
@@ -674,15 +674,18 @@ int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
                         pstr->substream = substream;
                 else
                         prev->next = substream;
-                err = snd_pcm_substream_proc_init(substream);
-                if (err < 0) {
-                        snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
-                        if (prev == NULL)
-                                pstr->substream = NULL;
-                        else
-                                prev->next = NULL;
-                        kfree(substream);
-                        return err;
+
+                if (!pcm->internal) {
+                        err = snd_pcm_substream_proc_init(substream);
+                        if (err < 0) {
+                                snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
+                                if (prev == NULL)
+                                        pstr->substream = NULL;
+                                else
+                                        prev->next = NULL;
+                                kfree(substream);
+                                return err;
+                        }
                 }
                 substream->group = &substream->self_group;
                 spin_lock_init(&substream->self_group.lock);
@@ -696,25 +699,9 @@ int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 
 EXPORT_SYMBOL(snd_pcm_new_stream);
 
-/**
- * snd_pcm_new - create a new PCM instance
- * @card: the card instance
- * @id: the id string
- * @device: the device index (zero based)
- * @playback_count: the number of substreams for playback
- * @capture_count: the number of substreams for capture
- * @rpcm: the pointer to store the new pcm instance
- *
- * Creates a new PCM instance.
- *
- * The pcm operators have to be set afterwards to the new instance
- * via snd_pcm_set_ops().
- *
- * Returns zero if successful, or a negative error code on failure.
- */
-int snd_pcm_new(struct snd_card *card, const char *id, int device,
-                int playback_count, int capture_count,
-                struct snd_pcm ** rpcm)
+static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
+                int playback_count, int capture_count, bool internal,
+                struct snd_pcm **rpcm)
 {
         struct snd_pcm *pcm;
         int err;
@@ -735,6 +722,7 @@ int snd_pcm_new(struct snd_card *card, const char *id, int device,
         }
         pcm->card = card;
         pcm->device = device;
+        pcm->internal = internal;
         if (id)
                 strlcpy(pcm->id, id, sizeof(pcm->id));
         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
@@ -756,8 +744,59 @@ int snd_pcm_new(struct snd_card *card, const char *id, int device,
         return 0;
 }
 
+/**
+ * snd_pcm_new - create a new PCM instance
+ * @card: the card instance
+ * @id: the id string
+ * @device: the device index (zero based)
+ * @playback_count: the number of substreams for playback
+ * @capture_count: the number of substreams for capture
+ * @rpcm: the pointer to store the new pcm instance
+ *
+ * Creates a new PCM instance.
+ *
+ * The pcm operators have to be set afterwards to the new instance
+ * via snd_pcm_set_ops().
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ */
+int snd_pcm_new(struct snd_card *card, const char *id, int device,
+                int playback_count, int capture_count, struct snd_pcm **rpcm)
+{
+        return _snd_pcm_new(card, id, device, playback_count, capture_count,
+                        false, rpcm);
+}
 EXPORT_SYMBOL(snd_pcm_new);
 
+/**
+ * snd_pcm_new_internal - create a new internal PCM instance
+ * @card: the card instance
+ * @id: the id string
+ * @device: the device index (zero based - shared with normal PCMs)
+ * @playback_count: the number of substreams for playback
+ * @capture_count: the number of substreams for capture
+ * @rpcm: the pointer to store the new pcm instance
+ *
+ * Creates a new internal PCM instance with no userspace device or procfs
+ * entries. This is used by ASoC Back End PCMs in order to create a PCM that
+ * will only be used internally by kernel drivers. i.e. it cannot be opened
+ * by userspace. It provides existing ASoC components drivers with a substream
+ * and access to any private data.
+ *
+ * The pcm operators have to be set afterwards to the new instance
+ * via snd_pcm_set_ops().
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ */
+int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
+        int playback_count, int capture_count,
+        struct snd_pcm **rpcm)
+{
+        return _snd_pcm_new(card, id, device, playback_count, capture_count,
+                        true, rpcm);
+}
+EXPORT_SYMBOL(snd_pcm_new_internal);
+
 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 {
         struct snd_pcm_substream *substream, *substream_next;
@@ -994,7 +1033,7 @@ static int snd_pcm_dev_register(struct snd_device *device)
         }
         for (cidx = 0; cidx < 2; cidx++) {
                 int devtype = -1;
-                if (pcm->streams[cidx].substream == NULL)
+                if (pcm->streams[cidx].substream == NULL || pcm->internal)
                         continue;
                 switch (cidx) {
                 case SNDRV_PCM_STREAM_PLAYBACK: