linux-kernel - [PATCH v4 2/4] HID: hid-sensor-custom: Convert sprintf() family to sysfs

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Message-Id: <20240319054527.1581299-2-lizhijian@fujitsu.com>
Date: Tue, 19 Mar 2024 13:45:25 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: linux-kernel@...r.kernel.org
Cc: Li Zhijian <lizhijian@...itsu.com>,
	Jiri Kosina <jikos@...nel.org>,
	Jonathan Cameron <jic23@...nel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	linux-input@...r.kernel.org,
	linux-iio@...r.kernel.org,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v4 2/4] HID: hid-sensor-custom: Convert sprintf() family to sysfs_emit() family

Per filesystems/sysfs.rst, show() should only use sysfs_emit()
or sysfs_emit_at() when formatting the value to be returned to user space.

coccinelle complains that there are still a couple of functions that use
snprintf(). Convert them to sysfs_emit().

sprintf() and scnprintf() will be converted as well if they have.

Generally, this patch is generated by
make coccicheck M=<path/to/file> MODE=patch \
COCCI=scripts/coccinelle/api/device_attr_show.cocci

No functional change intended

CC: Jiri Kosina <jikos@...nel.org>
CC: Jonathan Cameron <jic23@...nel.org>
CC: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
CC: Benjamin Tissoires <benjamin.tissoires@...hat.com>
CC: linux-input@...r.kernel.org
CC: linux-iio@...r.kernel.org
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
V3:
   rewrap the line as will be under 80 chars and add Reviewed-by # Jonathan
This is a part of the work "Fix coccicheck device_attr_show warnings"[1]
Split them per subsystem so that the maintainer can review it easily
[1] https://lore.kernel.org/lkml/20240116041129.3937800-1-lizhijian@fujitsu.com/
---
 drivers/hid/hid-sensor-custom.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/hid/hid-sensor-custom.c b/drivers/hid/hid-sensor-custom.c
index d85398721659..ac214777d7d9 100644
--- a/drivers/hid/hid-sensor-custom.c
+++ b/drivers/hid/hid-sensor-custom.c
@@ -155,7 +155,7 @@ static ssize_t enable_sensor_show(struct device *dev,
 {
 	struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%d\n", sensor_inst->enable);
+	return sysfs_emit(buf, "%d\n", sensor_inst->enable);
 }
 
 static int set_power_report_state(struct hid_sensor_custom *sensor_inst,
@@ -372,14 +372,13 @@ static ssize_t show_value(struct device *dev, struct device_attribute *attr,
 				     sizeof(struct hid_custom_usage_desc),
 				     usage_id_cmp);
 		if (usage_desc)
-			return snprintf(buf, PAGE_SIZE, "%s\n",
-					usage_desc->desc);
+			return sysfs_emit(buf, "%s\n", usage_desc->desc);
 		else
-			return sprintf(buf, "not-specified\n");
+			return sysfs_emit(buf, "not-specified\n");
 	 } else
 		return -EINVAL;
 
-	return sprintf(buf, "%d\n", value);
+	return sysfs_emit(buf, "%d\n", value);
 }
 
 static ssize_t store_value(struct device *dev, struct device_attribute *attr,
-- 
2.29.2