linux-kernel - [PATCH] ASoC: core: Optionaly add the component driver name to the component name

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Message-Id: <20200910200308.9125-1-dafna.hirschfeld@collabora.com>
Date:   Thu, 10 Sep 2020 22:03:08 +0200
From:   Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
To:     linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
        broonie@...nel.org
Cc:     tiwai@...e.com, enric.balletbo@...labora.com, kernel@...labora.com,
        dafna3@...il.com, lgirdwood@...il.com, perex@...ex.cz,
        linux-mediatek@...ts.infradead.org,
        ranjani.sridharan@...ux.intel.com, matthias.bgg@...il.com,
        dmitry.baryshkov@...aro.org,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
Subject: [PATCH] ASoC: core: Optionaly add the component driver name to the component name

The ASoC platform driver for Mediatek MT8173 registers
several components with identical name. This cause an
error:
"Directory '11220000.audio-controller' with parent 'mtk-rt5650' already present!"
when adding debugfs directory for those components.
To fix this, the function 'fmt_single_name' can receive the name
of the component driver and concatenate it to the name of the debugfs
directory for the component.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
---
 sound/soc/soc-core.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 74df22486e30..f470e713b030 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -2227,7 +2227,7 @@ EXPORT_SYMBOL_GPL(snd_soc_unregister_card);
  * Simplify DAI link configuration by removing ".-1" from device names
  * and sanitizing names.
  */
-static char *fmt_single_name(struct device *dev, int *id)
+static char *fmt_single_name(struct device *dev, int *id, const char *component_driver_name)
 {
 	const char *devname = dev_name(dev);
 	char *found, *name;
@@ -2263,6 +2263,12 @@ static char *fmt_single_name(struct device *dev, int *id)
 		*id = 0;
 	}
 
+	if (component_driver_name) {
+		char *tmp = name;
+
+		name = devm_kasprintf(dev, GFP_KERNEL, "%s-%s", name, component_driver_name);
+		devm_kfree(dev, tmp);
+	}
 	return name;
 }
 
@@ -2327,7 +2333,7 @@ struct snd_soc_dai *snd_soc_register_dai(struct snd_soc_component *component,
 	 */
 	if (legacy_dai_naming &&
 	    (dai_drv->id == 0 || dai_drv->name == NULL)) {
-		dai->name = fmt_single_name(dev, &dai->id);
+		dai->name = fmt_single_name(dev, &dai->id, NULL);
 	} else {
 		dai->name = fmt_multiple_name(dev, dai_drv);
 		if (dai_drv->id)
@@ -2460,7 +2466,7 @@ int snd_soc_component_initialize(struct snd_soc_component *component,
 	INIT_LIST_HEAD(&component->card_list);
 	mutex_init(&component->io_mutex);
 
-	component->name = fmt_single_name(dev, &component->id);
+	component->name = fmt_single_name(dev, &component->id, driver->name);
 	if (!component->name) {
 		dev_err(dev, "ASoC: Failed to allocate name\n");
 		return -ENOMEM;
-- 
2.17.1