platform/x86/dell: alienware-wmi: Use sysfs_emit() instead of scnprintf()

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@zte.com.cn>
Link: https://lore.kernel.org/r/202212021721543696124@zte.com.cn
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/drivers/platform/x86/dell/alienware-wmi.c b/drivers/platform/x86/dell/alienware-wmi.c
index a34e07ef2c79dd280252e07cb5128fd7a57c37b0..a9477e5432e4abec88710cf62f32ff7b114a3de3 100644 (file)
--- 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,