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 c556fe1..2fb935d 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -2247,24 +2247,50 @@
/* 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;
-}
-static void hda_unlock_devices(struct snd_card *card)
+ err_clear:
+ card->shutdown = 0;
+ err_unlock:
+ spin_unlock(&card->files_lock);
+ return -EINVAL;
+}
+EXPORT_SYMBOL_HDA(snd_hda_lock_devices);
+
+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 @@
*/
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)
+ if (snd_hda_lock_devices(bus) < 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);
- 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 @@
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 @@
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 @@
codec->owner = NULL;
/* allow device access again */
- hda_unlock_devices(card);
+ snd_hda_unlock_devices(bus);
return 0;
}