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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     alsa-devel@alsa-project.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Vinod Koul <vkoul@kernel.org>,
        Bard Liao <yung-chuan.liao@linux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
        Sanyog Kale <sanyog.r.kale@intel.com>,
        linux-kernel@vger.kernel.org
Subject: [PATCH 2/5] soundwire: sysfs: cleanup the logic for creating the dp0 sysfs attributes
Date:   Fri, 29 Jul 2022 15:50:38 +0200
Message-Id: <20220729135041.2285908-2-gregkh@linuxfoundation.org>
In-Reply-To: <20220729135041.2285908-1-gregkh@linuxfoundation.org>
References: <20220729135041.2285908-1-gregkh@linuxfoundation.org>
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There's no need to special-case the dp0 sysfs attributes, the
is_visible() callback in the attribute group can handle that for us, so
add that and add it to the attribute group list making the logic simpler
overall.

This is a step on the way to moving all of the sysfs attribute handling
into the default driver core attribute group logic so that the soundwire
core does not have to do any of it manually.

Cc: Vinod Koul <vkoul@kernel.org>
Cc: Bard Liao <yung-chuan.liao@linux.intel.com>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: Sanyog Kale <sanyog.r.kale@intel.com>
Cc: alsa-devel@alsa-project.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/soundwire/sysfs_slave.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/soundwire/sysfs_slave.c b/drivers/soundwire/sysfs_slave.c
index 83e3f6cc3250..3723333a5c2b 100644
--- a/drivers/soundwire/sysfs_slave.c
+++ b/drivers/soundwire/sysfs_slave.c
@@ -174,6 +174,16 @@ static ssize_t words_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(words);
 
+static umode_t dp0_is_visible(struct kobject *kobj, struct attribute *attr,
+			      int n)
+{
+	struct sdw_slave *slave = dev_to_sdw_dev(kobj_to_dev(kobj));
+
+	if (slave->prop.dp0_prop)
+		return attr->mode;
+	return 0;
+}
+
 static struct attribute *dp0_attrs[] = {
 	&dev_attr_max_word.attr,
 	&dev_attr_min_word.attr,
@@ -190,12 +200,14 @@ static struct attribute *dp0_attrs[] = {
  */
 static const struct attribute_group dp0_group = {
 	.attrs = dp0_attrs,
+	.is_visible = dp0_is_visible,
 	.name = "dp0",
 };
 
 static const struct attribute_group *slave_groups[] = {
 	&slave_attr_group,
 	&sdw_slave_dev_attr_group,
+	&dp0_group,
 	NULL,
 };
 
@@ -207,12 +219,6 @@ int sdw_slave_sysfs_init(struct sdw_slave *slave)
 	if (ret < 0)
 		return ret;
 
-	if (slave->prop.dp0_prop) {
-		ret = devm_device_add_group(&slave->dev, &dp0_group);
-		if (ret < 0)
-			return ret;
-	}
-
 	if (slave->prop.source_ports || slave->prop.sink_ports) {
 		ret = sdw_slave_sysfs_dpn_init(slave);
 		if (ret < 0)
-- 
2.37.1