ASoC: Make aux_dev more like a generic component

aux_dev is mainly used by the machine driver to specify analog devices,
which are registered as codecs. Making it more like a generic component
can help the machine driver to use it to specify any component with
topology info by name.

Details:
- Remove the stub 'rtd_aux' array from the soc card.
- Add a list 'aux_comp_list' to store the components of aux_devs.
  And add a list head 'list_aux' to struct snd_soc_component, for adding
  such components to the above list.
- Add a 'init' ops to a component for machine specific init.
  soc_bind_aux_dev() will set it to be aux_dev's init. And it will be
  called when probing the component.
- soc_bind_aux_dev() will also search components by name of an aux_dev,
  since it may not be a codec.
- Move probing of aux_devs before checking new DAI links brought by
  topology.
- Move removal of aux_devs later than removal of links. Because topology
  of aux components may register DAIs and the DAI drivers will go with
  removal of the aux components, we want soc_remove_link_dais() to remove
  the DAIs at first.
Signed-off-by: Mengdong Lin <mengdong.lin@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc.h

@@ -787,6 +787,7 @@ struct snd_soc_component {
 	unsigned int registered_as_component:1;
 
 	struct list_head list;
+	struct list_head list_aux; /* for auxiliary component of the card */
 
 	struct snd_soc_dai_driver *dai_drv;
 	int num_dai;
@@ -830,6 +831,9 @@ struct snd_soc_component {
 	int (*probe)(struct snd_soc_component *);
 	void (*remove)(struct snd_soc_component *);
 
+	/* machine specific init */
+	int (*init)(struct snd_soc_component *component);
+
 #ifdef CONFIG_DEBUG_FS
 	void (*init_debugfs)(struct snd_soc_component *component);
 	const char *debugfs_prefix;
@@ -1130,8 +1134,7 @@ struct snd_soc_card {
 	 */
 	struct snd_soc_aux_dev *aux_dev;
 	int num_aux_devs;
-	struct snd_soc_pcm_runtime *rtd_aux;
-	int num_aux_rtd;
+	struct list_head aux_comp_list;
 
 	const struct snd_kcontrol_new *controls;
 	int num_controls;
@@ -1537,6 +1540,7 @@ static inline void snd_soc_initialize_card_lists(struct snd_soc_card *card)
 	INIT_LIST_HEAD(&card->widgets);
 	INIT_LIST_HEAD(&card->paths);
 	INIT_LIST_HEAD(&card->dapm_list);
+	INIT_LIST_HEAD(&card->aux_comp_list);
 }
 
 static inline bool snd_soc_volsw_is_stereo(struct soc_mixer_control *mc)

sound/soc/soc-core.c

@@ -1413,6 +1413,16 @@ static int soc_probe_component(struct snd_soc_card *card,
 			component->name);
 	}
 
+	/* machine specific init */
+	if (component->init) {
+		ret = component->init(component);
+		if (ret < 0) {
+			dev_err(component->dev,
+				"Failed to do machine specific init %d\n", ret);
+			goto err_probe;
+		}
+	}
+
 	if (component->controls)
 		snd_soc_add_component_controls(component, component->controls,
 				     component->num_controls);
@@ -1657,65 +1667,81 @@ static int soc_probe_link_dais(struct snd_soc_card *card,
 
 static int soc_bind_aux_dev(struct snd_soc_card *card, int num)
 {
-	struct snd_soc_pcm_runtime *rtd = &card->rtd_aux[num];
 	struct snd_soc_aux_dev *aux_dev = &card->aux_dev[num];
-	const char *name = aux_dev->codec_name;
-
-	rtd->component = soc_find_component(aux_dev->codec_of_node, name);
-	if (!rtd->component) {
-		if (aux_dev->codec_of_node)
-			name = of_node_full_name(aux_dev->codec_of_node);
-
-		dev_err(card->dev, "ASoC: %s not registered\n", name);
-		return -EPROBE_DEFER;
+	struct snd_soc_component *component;
+	const char *name;
+	struct device_node *codec_of_node;
+
+	if (aux_dev->codec_of_node || aux_dev->codec_name) {
+		/* codecs, usually analog devices */
+		name = aux_dev->codec_name;
+		codec_of_node = aux_dev->codec_of_node;
+		component = soc_find_component(codec_of_node, name);
+		if (!component) {
+			if (codec_of_node)
+				name = of_node_full_name(codec_of_node);
+			goto err_defer;
+		}
+	} else if (aux_dev->name) {
+		/* generic components */
+		name = aux_dev->name;
+		component = soc_find_component(NULL, name);
+		if (!component)
+			goto err_defer;
+	} else {
+		dev_err(card->dev, "ASoC: Invalid auxiliary device\n");
+		return -EINVAL;
 	}
 
-	/*
-	 * Some places still reference rtd->codec, so we have to keep that
-	 * initialized if the component is a CODEC. Once all those references
-	 * have been removed, this code can be removed as well.
-	 */
-	 rtd->codec = rtd->component->codec;
-
+	component->init = aux_dev->init;
+	list_add(&component->list_aux, &card->aux_comp_list);
 	return 0;
+
+err_defer:
+	dev_err(card->dev, "ASoC: %s not registered\n", name);
+	return -EPROBE_DEFER;
 }
 
-static int soc_probe_aux_dev(struct snd_soc_card *card, int num)
+static int soc_probe_aux_devices(struct snd_soc_card *card)
 {
-	struct snd_soc_pcm_runtime *rtd = &card->rtd_aux[num];
-	struct snd_soc_aux_dev *aux_dev = &card->aux_dev[num];
+	struct snd_soc_component *comp;
+	int order;
 	int ret;
 
-	ret = soc_probe_component(card, rtd->component);
-	if (ret < 0)
-		return ret;
-
-	/* do machine specific initialization */
-	if (aux_dev->init) {
-		ret = aux_dev->init(rtd->component);
-		if (ret < 0) {
-			dev_err(card->dev, "ASoC: failed to init %s: %d\n",
-				aux_dev->name, ret);
-			return ret;
+	for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
+		order++) {
+		list_for_each_entry(comp, &card->aux_comp_list, list_aux) {
+			if (comp->driver->probe_order == order) {
+				ret = soc_probe_component(card,	comp);
+				if (ret < 0) {
+					dev_err(card->dev,
+						"ASoC: failed to probe aux component %s %d\n",
+						comp->name, ret);
+					return ret;
+				}
+			}
 		}
 	}
 
-	return soc_post_component_init(rtd, aux_dev->name);
+	return 0;
 }
 
-static void soc_remove_aux_dev(struct snd_soc_card *card, int num)
+static void soc_remove_aux_devices(struct snd_soc_card *card)
 {
-	struct snd_soc_pcm_runtime *rtd = &card->rtd_aux[num];
-	struct snd_soc_component *component = rtd->component;
+	struct snd_soc_component *comp, *_comp;
+	int order;
 
-	/* unregister the rtd device */
-	if (rtd->dev_registered) {
-		device_unregister(rtd->dev);
-		rtd->dev_registered = 0;
+	for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
+		order++) {
+		list_for_each_entry_safe(comp, _comp,
+			&card->aux_comp_list, list_aux) {
+			if (comp->driver->remove_order == order) {
+				soc_remove_component(comp);
+				/* remove it from the card's aux_comp_list */
+				list_del(&comp->list_aux);
+			}
+		}
 	}
-
-	if (component)
-		soc_remove_component(component);
 }
 
 static int snd_soc_init_codec_cache(struct snd_soc_codec *codec)
@@ -1894,6 +1920,11 @@ static int snd_soc_instantiate_card(struct snd_soc_card *card)
 		}
 	}
 
+	/* probe auxiliary components */
+	ret = soc_probe_aux_devices(card);
+	if (ret < 0)
+		goto probe_dai_err;
+
 	/* Find new DAI links added during probing components and bind them.
 	 * Components with topology may bring new DAIs and DAI links.
 	 */
@@ -1923,16 +1954,6 @@ static int snd_soc_instantiate_card(struct snd_soc_card *card)
 		}
 	}
 
-	for (i = 0; i < card->num_aux_devs; i++) {
-		ret = soc_probe_aux_dev(card, i);
-		if (ret < 0) {
-			dev_err(card->dev,
-				"ASoC: failed to add auxiliary devices %d\n",
-				ret);
-			goto probe_aux_dev_err;
-		}
-	}
-
 	snd_soc_dapm_link_dai_widgets(card);
 	snd_soc_dapm_connect_dai_link_widgets(card);
 
@@ -1992,8 +2013,7 @@ static int snd_soc_instantiate_card(struct snd_soc_card *card)
 	return 0;
 
 probe_aux_dev_err:
-	for (i = 0; i < card->num_aux_devs; i++)
-		soc_remove_aux_dev(card, i);
+	soc_remove_aux_devices(card);
 
 probe_dai_err:
 	soc_remove_dai_links(card);
@@ -2039,20 +2059,18 @@ static int soc_probe(struct platform_device *pdev)
 static int soc_cleanup_card_resources(struct snd_soc_card *card)
 {
 	struct snd_soc_pcm_runtime *rtd;
-	int i;
 
 	/* make sure any delayed work runs */
 	list_for_each_entry(rtd, &card->rtd_list, list)
 		flush_delayed_work(&rtd->delayed_work);
 
-	/* remove auxiliary devices */
-	for (i = 0; i < card->num_aux_devs; i++)
-		soc_remove_aux_dev(card, i);
-
 	/* remove and free each DAI */
 	soc_remove_dai_links(card);
 	soc_remove_pcm_runtimes(card);
 
+	/* remove auxiliary devices */
+	soc_remove_aux_devices(card);
+
 	soc_cleanup_card_debugfs(card);
 
 	/* remove the card */
@@ -2608,16 +2626,6 @@ int snd_soc_register_card(struct snd_soc_card *card)
 	INIT_LIST_HEAD(&card->rtd_list);
 	card->num_rtd = 0;
 
-	card->rtd_aux = devm_kzalloc(card->dev,
-				 sizeof(struct snd_soc_pcm_runtime) *
-				 card->num_aux_devs,
-				 GFP_KERNEL);
-	if (card->rtd_aux == NULL)
-		return -ENOMEM;
-
-	for (i = 0; i < card->num_aux_devs; i++)
-		card->rtd_aux[i].card = card;
-
 	INIT_LIST_HEAD(&card->dapm_dirty);
 	INIT_LIST_HEAD(&card->dobj_list);
 	card->instantiated = 0;