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Fri, 20 Mar 2026 15:24:32 -0700 (PDT) From: Gabriel Rondon To: lars@metafoo.de, Michael.Hennerich@analog.com, jic23@kernel.org, gregkh@linuxfoundation.org Cc: andriy.shevchenko@intel.com, dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, linux-iio@vger.kernel.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/3] staging: iio: ad9834: use sysfs_emit() and simplify show functions Date: Fri, 20 Mar 2026 22:24:24 +0000 Message-Id: <20260320222424.53294-4-grondon@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20260320222424.53294-1-grondon@gmail.com> References: <20260319225719.73587-1-grondon@gmail.com> <20260320222424.53294-1-grondon@gmail.com> Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Replace sprintf() with sysfs_emit() in sysfs attribute show functions. sysfs_emit() is the preferred API for sysfs callbacks as it is aware of the PAGE_SIZE buffer limit. Also simplify the wavetype_available show functions by removing the intermediate string variable and returning directly from each branch. Signed-off-by: Gabriel Rondon --- drivers/staging/iio/frequency/ad9834.c | 20 ++++++-------------- 1 file changed, 6 insertions(+), 14 deletions(-) diff --git a/drivers/staging/iio/frequency/ad9834.c b/drivers/staging/iio/frequency/ad9834.c index d339d5e8e..bdb2580e2 100644 --- a/drivers/staging/iio/frequency/ad9834.c +++ b/drivers/staging/iio/frequency/ad9834.c @@ -281,16 +281,12 @@ ssize_t ad9834_show_out0_wavetype_available(struct device *dev, { struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct ad9834_state *st = iio_priv(indio_dev); - char *str; if (st->devid == ID_AD9833 || st->devid == ID_AD9837) - str = "sine triangle square"; - else if (st->control & AD9834_OPBITEN) - str = "sine"; - else - str = "sine triangle"; - - return sprintf(buf, "%s\n", str); + return sysfs_emit(buf, "sine triangle square\n"); + if (st->control & AD9834_OPBITEN) + return sysfs_emit(buf, "sine\n"); + return sysfs_emit(buf, "sine triangle\n"); } static IIO_DEVICE_ATTR(out_altvoltage0_out0_wavetype_available, 0444, @@ -303,14 +299,10 @@ ssize_t ad9834_show_out1_wavetype_available(struct device *dev, { struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct ad9834_state *st = iio_priv(indio_dev); - char *str; if (st->control & AD9834_MODE) - str = ""; - else - str = "square"; - - return sprintf(buf, "%s\n", str); + return sysfs_emit(buf, "\n"); + return sysfs_emit(buf, "square\n"); } static IIO_DEVICE_ATTR(out_altvoltage0_out1_wavetype_available, 0444, -- 2.33.0