ALSA: hda - Export snd_hda_lock_devices()

It's a preliminary work for the vga-switcher support.
Export the function to do pseudo-lock for the sound card to be used
in other places.

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

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index c556fe1c25eb8676f4dc14e841cbca8111766e09..2fb935d9dccc0cb48adfa0d4d61a96b789b12c1f 100644 (file)
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -2247,24 +2247,50 @@ void snd_hda_ctls_clear(struct hda_codec *codec)
 /* pseudo device locking
  * toggle card->shutdown to allow/disallow the device access (as a hack)
  */
-static int hda_lock_devices(struct snd_card *card)
+int snd_hda_lock_devices(struct hda_bus *bus)
 {
+       struct snd_card *card = bus->card;
+       struct hda_codec *codec;
+
        spin_lock(&card->files_lock);
-       if (card->shutdown) {
-               spin_unlock(&card->files_lock);
-               return -EINVAL;
-       }
+       if (card->shutdown)
+               goto err_unlock;
        card->shutdown = 1;
+       if (!list_empty(&card->ctl_files))
+               goto err_clear;
+
+       list_for_each_entry(codec, &bus->codec_list, list) {
+               int pcm;
+               for (pcm = 0; pcm < codec->num_pcms; pcm++) {
+                       struct hda_pcm *cpcm = &codec->pcm_info[pcm];
+                       if (!cpcm->pcm)
+                               continue;
+                       if (cpcm->pcm->streams[0].substream_opened ||
+                           cpcm->pcm->streams[1].substream_opened)
+                               goto err_clear;
+               }
+       }
        spin_unlock(&card->files_lock);
        return 0;
+
+ err_clear:
+       card->shutdown = 0;
+ err_unlock:
+       spin_unlock(&card->files_lock);
+       return -EINVAL;
 }
+EXPORT_SYMBOL_HDA(snd_hda_lock_devices);
 
-static void hda_unlock_devices(struct snd_card *card)
+void snd_hda_unlock_devices(struct hda_bus *bus)
 {
+       struct snd_card *card = bus->card;
+
+       card = bus->card;
        spin_lock(&card->files_lock);
        card->shutdown = 0;
        spin_unlock(&card->files_lock);
 }
+EXPORT_SYMBOL_HDA(snd_hda_unlock_devices);
 
 /**
  * snd_hda_codec_reset - Clear all objects assigned to the codec
@@ -2278,26 +2304,12 @@ static void hda_unlock_devices(struct snd_card *card)
  */
 int snd_hda_codec_reset(struct hda_codec *codec)
 {
-       struct snd_card *card = codec->bus->card;
-       int i, pcm;
+       struct hda_bus *bus = codec->bus;
+       struct snd_card *card = bus->card;
+       int i;
 
-       if (hda_lock_devices(card) < 0)
-               return -EBUSY;
-       /* check whether the codec isn't used by any mixer or PCM streams */
-       if (!list_empty(&card->ctl_files)) {
-               hda_unlock_devices(card);
+       if (snd_hda_lock_devices(bus) < 0)
                return -EBUSY;
-       }
-       for (pcm = 0; pcm < codec->num_pcms; pcm++) {
-               struct hda_pcm *cpcm = &codec->pcm_info[pcm];
-               if (!cpcm->pcm)
-                       continue;
-               if (cpcm->pcm->streams[0].substream_opened ||
-                   cpcm->pcm->streams[1].substream_opened) {
-                       hda_unlock_devices(card);
-                       return -EBUSY;
-               }
-       }
 
        /* OK, let it free */
 
@@ -2306,7 +2318,7 @@ int snd_hda_codec_reset(struct hda_codec *codec)
        codec->power_on = 0;
        codec->power_transition = 0;
        codec->power_jiffies = jiffies;
-       flush_workqueue(codec->bus->workq);
+       flush_workqueue(bus->workq);
 #endif
        snd_hda_ctls_clear(codec);
        /* relase PCMs */
@@ -2314,7 +2326,7 @@ int snd_hda_codec_reset(struct hda_codec *codec)
                if (codec->pcm_info[i].pcm) {
                        snd_device_free(card, codec->pcm_info[i].pcm);
                        clear_bit(codec->pcm_info[i].device,
-                                 codec->bus->pcm_dev_bits);
+                                 bus->pcm_dev_bits);
                }
        }
        if (codec->patch_ops.free)
@@ -2339,7 +2351,7 @@ int snd_hda_codec_reset(struct hda_codec *codec)
        codec->owner = NULL;
 
        /* allow device access again */
-       hda_unlock_devices(card);
+       snd_hda_unlock_devices(bus);
        return 0;
 }
 

diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index 29a311b05f2d0c28d70d30b8b5261ee773073885..be91cdbb1621e7c1f3642ae8c39342a12d40f7c5 100644 (file)
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -1020,6 +1020,9 @@ void snd_hda_codec_set_power_to_all(struct hda_codec *codec, hda_nid_t fg,
                                    unsigned int power_state,
                                    bool eapd_workaround);
 
+int snd_hda_lock_devices(struct hda_bus *bus);
+void snd_hda_unlock_devices(struct hda_bus *bus);
+
 /*
  * power management
  */