linux-kernel - [PATCH v1 1/1] iio: chemical: scd30_core: use sysfs

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Message-Id: <20230113141117.23353-1-andriy.shevchenko@linux.intel.com>
Date:   Fri, 13 Jan 2023 16:11:17 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Tomasz Duszynski <tomasz.duszynski@...akon.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/1] iio: chemical: scd30_core: use sysfs_emit() to 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: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/iio/chemical/scd30_core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/chemical/scd30_core.c b/drivers/iio/chemical/scd30_core.c
index 682fca39d14d..e0bb1dd5e790 100644
--- a/drivers/iio/chemical/scd30_core.c
+++ b/drivers/iio/chemical/scd30_core.c
@@ -354,7 +354,7 @@ static ssize_t sampling_frequency_available_show(struct device *dev, struct devi
 	ssize_t len = 0;
 
 	do {
-		len += scnprintf(buf + len, PAGE_SIZE - len, "0.%09u ", 1000000000 / i);
+		len += sysfs_emit_at(buf, len, "0.%09u ", 1000000000 / i);
 		/*
 		 * Not all values fit PAGE_SIZE buffer hence print every 6th
 		 * (each frequency differs by 6s in time domain from the
@@ -380,7 +380,7 @@ static ssize_t calibration_auto_enable_show(struct device *dev, struct device_at
 	ret = scd30_command_read(state, CMD_ASC, &val);
 	mutex_unlock(&state->lock);
 
-	return ret ?: sprintf(buf, "%d\n", val);
+	return ret ?: sysfs_emit(buf, "%d\n", val);
 }
 
 static ssize_t calibration_auto_enable_store(struct device *dev, struct device_attribute *attr,
@@ -414,7 +414,7 @@ static ssize_t calibration_forced_value_show(struct device *dev, struct device_a
 	ret = scd30_command_read(state, CMD_FRC, &val);
 	mutex_unlock(&state->lock);
 
-	return ret ?: sprintf(buf, "%d\n", val);
+	return ret ?: sysfs_emit(buf, "%d\n", val);
 }
 
 static ssize_t calibration_forced_value_store(struct device *dev, struct device_attribute *attr,
-- 
2.39.0