linux-kernel - [PATCH v4] iio: st_lsm6dsx: Replace scnprintf with sysfs

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Message-ID: <20250811165641.1214347-1-akbansd@gmail.com>
Date: Mon, 11 Aug 2025 22:26:40 +0530
From: Akshay Bansod <akbansd@...il.com>
To: Lorenzo Bianconi <lorenzo@...nel.org>,
	Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>
Cc: linux-kernel-mentees@...ts.linuxfoundation.org,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4] iio: st_lsm6dsx: Replace scnprintf with sysfs_emit

Update the sysfs interface for sampling frequency and scale attributes.
Replace `scnprintf()` with `sysfs_emit_at()` which is PAGE_SIZE-aware
and recommended for use in sysfs.

Signed-off-by: Akshay Bansod <akbansd@...il.com>
---

changes in v4:
- reformatted as per sugessions, used ternary operator
- Link to v3: https://lore.kernel.org/linux-iio/20250723141359.11723-1-akbansd@gmail.com/

changes in v3:
- Use `sysfs_emit_at(buf, len - 1, "\n")` instead of directly modifying `buf[len - 1]`
  for newline termination, aligning with `sysfs_emit_at()` usage.
- Link to v2: https://lore.kernel.org/linux-iio/20250703053900.36530-1-akbansd@gmail.com/

changes in v2:
- Fixed indentation for line wrap
- Link to v1: https://lore.kernel.org/linux-iio/20250702135855.59955-1-akbansd@gmail.com/

Testing:
- Built the driver (`st_lsm6dsx_i2c`) as a module.
- Tested using `i2c-stub` to mock the device.
- Verified that reading sysfs attributes like `sampling_frequency_available`
  works correctly and shows no change in functionality.
---
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
index c65ad4982..d8cb4b021 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
@@ -2035,10 +2035,10 @@ st_lsm6dsx_sysfs_sampling_frequency_avail(struct device *dev,
 
 	odr_table = &sensor->hw->settings->odr_table[sensor->id];
 	for (i = 0; i < odr_table->odr_len; i++)
-		len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%03d ",
-				 odr_table->odr_avl[i].milli_hz / 1000,
-				 odr_table->odr_avl[i].milli_hz % 1000);
-	buf[len - 1] = '\n';
+	     len += sysfs_emit_at(buf, len, "%d.%03d%c",
+				  odr_table->odr_avl[i].milli_hz / 1000,
+				  odr_table->odr_avl[i].milli_hz % 1000,
+				  (i == odr_table->odr_len - 1) ? '\n' : ' ');
 
 	return len;
 }
@@ -2054,9 +2054,9 @@ static ssize_t st_lsm6dsx_sysfs_scale_avail(struct device *dev,
 
 	fs_table = &hw->settings->fs_table[sensor->id];
 	for (i = 0; i < fs_table->fs_len; i++)
-		len += scnprintf(buf + len, PAGE_SIZE - len, "0.%09u ",
-				 fs_table->fs_avl[i].gain);
-	buf[len - 1] = '\n';
+	     len += sysfs_emit_at(buf, len, "0.%09u%c",
+				  fs_table->fs_avl[i].gain,
+				  (i == fs_table->fs_len - 1) ? '\n' : ' ');
 
 	return len;
 }
-- 
2.49.0