ALSA: hda - Add infrastructure for dynamic stream allocation

Added the infrastructure for dynamic stream allocation on HD-audio.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 66 insertions, 8 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 6447754ae56e..19b4530e3baf 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -2262,6 +2262,28 @@ static int __devinit set_pcm_default_values(struct hda_codec *codec,
         return 0;
 }
 
+/*
+ * attach a new PCM stream
+ */
+static int __devinit
+snd_hda_attach_pcm(struct hda_codec *codec, struct hda_pcm *pcm)
+{
+        struct hda_pcm_stream *info;
+        int stream, err;
+
+        if (!pcm->name)
+                return -EINVAL;
+        for (stream = 0; stream < 2; stream++) {
+                info = &pcm->stream[stream];
+                if (info->substreams) {
+                        err = set_pcm_default_values(codec, info);
+                        if (err < 0)
+                                return err;
+                }
+        }
+        return codec->bus->ops.attach_pcm(codec, pcm);
+}
+
 /**
  * snd_hda_build_pcms - build PCM information
  * @bus: the BUS
@@ -2290,10 +2312,24 @@ static int __devinit set_pcm_default_values(struct hda_codec *codec,
  */
 int __devinit snd_hda_build_pcms(struct hda_bus *bus)
 {
+        static const char *dev_name[HDA_PCM_NTYPES] = {
+                "Audio", "SPDIF", "HDMI", "Modem"
+        };
+        /* starting device index for each PCM type */
+        static int dev_idx[HDA_PCM_NTYPES] = {
+                [HDA_PCM_TYPE_AUDIO] = 0,
+                [HDA_PCM_TYPE_SPDIF] = 1,
+                [HDA_PCM_TYPE_HDMI] = 3,
+                [HDA_PCM_TYPE_MODEM] = 6
+        };
+        /* normal audio device indices; not linear to keep compatibility */
+        static int audio_idx[4] = { 0, 2, 4, 5 };
         struct hda_codec *codec;
+        int num_devs[HDA_PCM_NTYPES];
 
+        memset(num_devs, 0, sizeof(num_devs));
         list_for_each_entry(codec, &bus->codec_list, list) {
-                unsigned int pcm, s;
+                unsigned int pcm;
                 int err;
                 if (!codec->patch_ops.build_pcms)
                         continue;
@@ -2301,15 +2337,37 @@ int __devinit snd_hda_build_pcms(struct hda_bus *bus)
                 if (err < 0)
                         return err;
                 for (pcm = 0; pcm < codec->num_pcms; pcm++) {
-                        for (s = 0; s < 2; s++) {
-                                struct hda_pcm_stream *info;
-                                info = &codec->pcm_info[pcm].stream[s];
-                                if (!info->substreams)
+                        struct hda_pcm *cpcm = &codec->pcm_info[pcm];
+                        int type = cpcm->pcm_type;
+                        switch (type) {
+                        case HDA_PCM_TYPE_AUDIO:
+                                if (num_devs[type] >= ARRAY_SIZE(audio_idx)) {
+                                        snd_printk(KERN_WARNING
+                                                   "Too many audio devices\n");
+                                        continue;
+                                }
+                                cpcm->device = audio_idx[num_devs[type]];
+                                break;
+                        case HDA_PCM_TYPE_SPDIF:
+                        case HDA_PCM_TYPE_HDMI:
+                        case HDA_PCM_TYPE_MODEM:
+                                if (num_devs[type]) {
+                                        snd_printk(KERN_WARNING
+                                                   "%s already defined\n",
+                                                   dev_name[type]);
                                         continue;
-                                err = set_pcm_default_values(codec, info);
-                                if (err < 0)
-                                        return err;
+                                }
+                                cpcm->device = dev_idx[type];
+                                break;
+                        default:
+                                snd_printk(KERN_WARNING
+                                           "Invalid PCM type %d\n", type);
+                                continue;
                         }
+                        num_devs[type]++;
+                        err = snd_hda_attach_pcm(codec, cpcm);
+                        if (err < 0)
+                                return err;
                 }
         }
         return 0;