[PATCH v2 3/4] ALSA: hda: Update and expose codec register procedures

[Cezary Rojewski]

With few changes, snd_hda_codec_register() and its
unregister-counterpart can be re-used by ASoC drivers. While at it,
provide kernel doc for the exposed functions.

Due to ALSA-device vs ASoC-component organization differences, new
'snddev_managed' argument is specified allowing for better control over
codec registration process.

Signed-off-by: Cezary Rojewski <cezary.rojewski at intel.com>
---

Changes v1 -> v2:
- snd_hda_codec_new() now calls snd_hda_codec_device_new() with
  'snddev_managed' param set to 'true', reported by Kai


 include/sound/hda_codec.h   |  5 ++++-
 sound/pci/hda/hda_codec.c   | 35 ++++++++++++++++++++++++++---------
 sound/pci/hda/hda_local.h   |  1 -
 sound/soc/codecs/hdac_hda.c |  2 +-
 4 files changed, 31 insertions(+), 12 deletions(-)

diff --git a/include/sound/hda_codec.h b/include/sound/hda_codec.h
index 5e3cbcca42f0..f74abc13414f 100644
--- a/include/sound/hda_codec.h
+++ b/include/sound/hda_codec.h
@@ -312,9 +312,12 @@ snd_hda_codec_device_init(struct hda_bus *bus, unsigned int codec_addr,
 int snd_hda_codec_new(struct hda_bus *bus, struct snd_card *card,
 		      unsigned int codec_addr, struct hda_codec **codecp);
 int snd_hda_codec_device_new(struct hda_bus *bus, struct snd_card *card,
-		      unsigned int codec_addr, struct hda_codec *codec);
+		      unsigned int codec_addr, struct hda_codec *codec,
+		      bool snddev_managed);
 int snd_hda_codec_configure(struct hda_codec *codec);
 int snd_hda_codec_update_widgets(struct hda_codec *codec);
+void snd_hda_codec_register(struct hda_codec *codec);
+void snd_hda_codec_unregister(struct hda_codec *codec);
 
 /*
  * low level functions
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 3787060ad77f..4afdc3b68bd6 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -813,7 +813,12 @@ void snd_hda_codec_display_power(struct hda_codec *codec, bool enable)
 		snd_hdac_display_power(&codec->bus->core, codec->addr, enable);
 }
 
-/* also called from hda_bind.c */
+/**
+ * snd_hda_codec_register - Finalize codec initialization
+ * @codec: codec device to register
+ *
+ * Also called from hda_bind.c
+ */
 void snd_hda_codec_register(struct hda_codec *codec)
 {
 	if (codec->registered)
@@ -826,6 +831,7 @@ void snd_hda_codec_register(struct hda_codec *codec)
 		codec->registered = 1;
 	}
 }
+EXPORT_SYMBOL_GPL(snd_hda_codec_register);
 
 static int snd_hda_codec_dev_register(struct snd_device *device)
 {
@@ -833,10 +839,12 @@ static int snd_hda_codec_dev_register(struct snd_device *device)
 	return 0;
 }
 
-static int snd_hda_codec_dev_free(struct snd_device *device)
+/**
+ * snd_hda_codec_unregister - Unregister specified codec device
+ * @codec: codec device to unregister
+ */
+void snd_hda_codec_unregister(struct hda_codec *codec)
 {
-	struct hda_codec *codec = device->device_data;
-
 	codec->in_freeing = 1;
 	/*
 	 * snd_hda_codec_device_new() is used by legacy HDA and ASoC driver.
@@ -853,7 +861,12 @@ static int snd_hda_codec_dev_free(struct snd_device *device)
 	 */
 	if (codec->core.type == HDA_DEV_LEGACY)
 		put_device(hda_codec_dev(codec));
+}
+EXPORT_SYMBOL_GPL(snd_hda_codec_unregister);
 
+static int snd_hda_codec_dev_free(struct snd_device *device)
+{
+	snd_hda_codec_unregister(device->device_data);
 	return 0;
 }
 
@@ -940,12 +953,13 @@ int snd_hda_codec_new(struct hda_bus *bus, struct snd_card *card,
 		return PTR_ERR(codec);
 	*codecp = codec;
 
-	return snd_hda_codec_device_new(bus, card, codec_addr, *codecp);
+	return snd_hda_codec_device_new(bus, card, codec_addr, *codecp, true);
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_new);
 
 int snd_hda_codec_device_new(struct hda_bus *bus, struct snd_card *card,
-			unsigned int codec_addr, struct hda_codec *codec)
+			unsigned int codec_addr, struct hda_codec *codec,
+			bool snddev_managed)
 {
 	char component[31];
 	hda_nid_t fg;
@@ -1020,9 +1034,12 @@ int snd_hda_codec_device_new(struct hda_bus *bus, struct snd_card *card,
 		codec->core.subsystem_id, codec->core.revision_id);
 	snd_component_add(card, component);
 
-	err = snd_device_new(card, SNDRV_DEV_CODEC, codec, &dev_ops);
-	if (err < 0)
-		goto error;
+	if (snddev_managed) {
+		/* ASoC features component management instead */
+		err = snd_device_new(card, SNDRV_DEV_CODEC, codec, &dev_ops);
+		if (err < 0)
+			goto error;
+	}
 
 	/* PM runtime needs to be enabled later after binding codec */
 	pm_runtime_forbid(&codec->core.dev);
diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index 8621f576446b..4c52dfb615bc 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -135,7 +135,6 @@ int __snd_hda_add_vmaster(struct hda_codec *codec, char *name,
 #define snd_hda_add_vmaster(codec, name, tlv, followers, suffix, access) \
 	__snd_hda_add_vmaster(codec, name, tlv, followers, suffix, true, access, NULL)
 int snd_hda_codec_reset(struct hda_codec *codec);
-void snd_hda_codec_register(struct hda_codec *codec);
 void snd_hda_codec_cleanup_for_unbind(struct hda_codec *codec);
 void snd_hda_codec_disconnect_pcms(struct hda_codec *codec);
 
diff --git a/sound/soc/codecs/hdac_hda.c b/sound/soc/codecs/hdac_hda.c
index de5955db0a5f..667f3df239c7 100644
--- a/sound/soc/codecs/hdac_hda.c
+++ b/sound/soc/codecs/hdac_hda.c
@@ -413,7 +413,7 @@ static int hdac_hda_codec_probe(struct snd_soc_component *component)
 				       HDA_CODEC_IDX_CONTROLLER, true);
 
 	ret = snd_hda_codec_device_new(hcodec->bus, component->card->snd_card,
-				       hdev->addr, hcodec);
+				       hdev->addr, hcodec, true);
 	if (ret < 0) {
 		dev_err(&hdev->dev, "failed to create hda codec %d\n", ret);
 		goto error_no_pm;
-- 
2.25.1