linux-kernel - [PATCH] platform/x86: dell: use sysfs

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Date:   Fri, 2 Dec 2022 17:21:54 +0800 (CST)
From:   <ye.xingchen@....com.cn>
To:     <hdegoede@...hat.com>
Cc:     <markgross@...nel.org>, <pobrn@...tonmail.com>,
        <dell.client.kernel@...l.com>,
        <platform-driver-x86@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] platform/x86: dell: use sysfs_emit() to instead of scnprintf()

From: ye xingchen <ye.xingchen@....com.cn>

Follow the advice of the Documentation/filesystems/sysfs.rst and show()
should only use sysfs_emit() or sysfs_emit_at() when formatting the
value to be returned to user space.

Signed-off-by: ye xingchen <ye.xingchen@....com.cn>
---
 drivers/platform/x86/dell/alienware-wmi.c | 41 +++++++++--------------
 1 file changed, 16 insertions(+), 25 deletions(-)

diff --git a/drivers/platform/x86/dell/alienware-wmi.c b/drivers/platform/x86/dell/alienware-wmi.c
index a34e07ef2c79..a9477e5432e4 100644
--- a/drivers/platform/x86/dell/alienware-wmi.c
+++ b/drivers/platform/x86/dell/alienware-wmi.c
@@ -398,10 +398,10 @@ static ssize_t show_control_state(struct device *dev,
 				  struct device_attribute *attr, char *buf)
 {
 	if (lighting_control_state == LEGACY_BOOTING)
-		return scnprintf(buf, PAGE_SIZE, "[booting] running suspend\n");
+		return sysfs_emit(buf, "[booting] running suspend\n");
 	else if (lighting_control_state == LEGACY_SUSPEND)
-		return scnprintf(buf, PAGE_SIZE, "booting running [suspend]\n");
-	return scnprintf(buf, PAGE_SIZE, "booting [running] suspend\n");
+		return sysfs_emit(buf, "booting running [suspend]\n");
+	return sysfs_emit(buf, "booting [running] suspend\n");
 }

 static ssize_t store_control_state(struct device *dev,
@@ -547,14 +547,12 @@ static ssize_t show_hdmi_cable(struct device *dev,
 				   (u32 *) &out_data);
 	if (ACPI_SUCCESS(status)) {
 		if (out_data == 0)
-			return scnprintf(buf, PAGE_SIZE,
-					 "[unconnected] connected unknown\n");
+			return sysfs_emit(buf, "[unconnected] connected unknown\n");
 		else if (out_data == 1)
-			return scnprintf(buf, PAGE_SIZE,
-					 "unconnected [connected] unknown\n");
+			return sysfs_emit(buf, "unconnected [connected] unknown\n");
 	}
 	pr_err("alienware-wmi: unknown HDMI cable status: %d\n", status);
-	return scnprintf(buf, PAGE_SIZE, "unconnected connected [unknown]\n");
+	return sysfs_emit(buf, "unconnected connected [unknown]\n");
 }

 static ssize_t show_hdmi_source(struct device *dev,
@@ -571,14 +569,12 @@ static ssize_t show_hdmi_source(struct device *dev,

 	if (ACPI_SUCCESS(status)) {
 		if (out_data == 1)
-			return scnprintf(buf, PAGE_SIZE,
-					 "[input] gpu unknown\n");
+			return sysfs_emit(buf, "[input] gpu unknown\n");
 		else if (out_data == 2)
-			return scnprintf(buf, PAGE_SIZE,
-					 "input [gpu] unknown\n");
+			return sysfs_emit(buf, "input [gpu] unknown\n");
 	}
 	pr_err("alienware-wmi: unknown HDMI source status: %u\n", status);
-	return scnprintf(buf, PAGE_SIZE, "input gpu [unknown]\n");
+	return sysfs_emit(buf, "input gpu [unknown]\n");
 }

 static ssize_t toggle_hdmi_source(struct device *dev,
@@ -652,14 +648,12 @@ static ssize_t show_amplifier_status(struct device *dev,
 				   (u32 *) &out_data);
 	if (ACPI_SUCCESS(status)) {
 		if (out_data == 0)
-			return scnprintf(buf, PAGE_SIZE,
-					 "[unconnected] connected unknown\n");
+			return sysfs_emit(buf, "[unconnected] connected unknown\n");
 		else if (out_data == 1)
-			return scnprintf(buf, PAGE_SIZE,
-					 "unconnected [connected] unknown\n");
+			return sysfs_emit(buf, "unconnected [connected] unknown\n");
 	}
 	pr_err("alienware-wmi: unknown amplifier cable status: %d\n", status);
-	return scnprintf(buf, PAGE_SIZE, "unconnected connected [unknown]\n");
+	return sysfs_emit(buf, "unconnected connected [unknown]\n");
 }

 static DEVICE_ATTR(status, S_IRUGO, show_amplifier_status, NULL);
@@ -706,17 +700,14 @@ static ssize_t show_deepsleep_status(struct device *dev,
 					(u32 *) &out_data);
 	if (ACPI_SUCCESS(status)) {
 		if (out_data == 0)
-			return scnprintf(buf, PAGE_SIZE,
-					 "[disabled] s5 s5_s4\n");
+			return sysfs_emit(buf, "[disabled] s5 s5_s4\n");
 		else if (out_data == 1)
-			return scnprintf(buf, PAGE_SIZE,
-					 "disabled [s5] s5_s4\n");
+			return sysfs_emit(buf, "disabled [s5] s5_s4\n");
 		else if (out_data == 2)
-			return scnprintf(buf, PAGE_SIZE,
-					 "disabled s5 [s5_s4]\n");
+			return sysfs_emit(buf, "disabled s5 [s5_s4]\n");
 	}
 	pr_err("alienware-wmi: unknown deep sleep status: %d\n", status);
-	return scnprintf(buf, PAGE_SIZE, "disabled s5 s5_s4 [unknown]\n");
+	return sysfs_emit(buf, "disabled s5 s5_s4 [unknown]\n");
 }

 static ssize_t toggle_deepsleep(struct device *dev,
-- 
2.25.1