iio: core: Use sysfs_emit() (trivial bits)

sysfs_emit() is preferred over raw s*printf() for sysfs attributes since it
knows about the sysfs buffer specifics and has some built-in sanity checks.

This patch converts the places in the iio core that follow the pattern of

   return s*printf(...)

to

   return sysfs_emit(...)

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20210320071405.9347-2-lars@metafoo.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index ee5aab9..ccc8a8c 100644 (file)
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -260,7 +260,7 @@ static ssize_t iio_show_scan_index(struct device *dev,
                                   struct device_attribute *attr,
                                   char *buf)
 {
-       return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index);
+       return sysfs_emit(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index);
 }
 
 static ssize_t iio_show_fixed_type(struct device *dev,
@@ -278,15 +278,15 @@ static ssize_t iio_show_fixed_type(struct device *dev,
 #endif
        }
        if (this_attr->c->scan_type.repeat > 1)
-               return sprintf(buf, "%s:%c%d/%dX%d>>%u\n",
+               return sysfs_emit(buf, "%s:%c%d/%dX%d>>%u\n",
                       iio_endian_prefix[type],
                       this_attr->c->scan_type.sign,
                       this_attr->c->scan_type.realbits,
                       this_attr->c->scan_type.storagebits,
                       this_attr->c->scan_type.repeat,
                       this_attr->c->scan_type.shift);
-               else
-                       return sprintf(buf, "%s:%c%d/%d>>%u\n",
+       else
+               return sysfs_emit(buf, "%s:%c%d/%d>>%u\n",
                       iio_endian_prefix[type],
                       this_attr->c->scan_type.sign,
                       this_attr->c->scan_type.realbits,
@@ -305,7 +305,7 @@ static ssize_t iio_scan_el_show(struct device *dev,
        ret = !!test_bit(to_iio_dev_attr(attr)->address,
                       buffer->scan_mask);
 
-       return sprintf(buf, "%d\n", ret);
+       return sysfs_emit(buf, "%d\n", ret);
 }
 
 /* Note NULL used as error indicator as it doesn't make sense. */
@@ -449,7 +449,7 @@ static ssize_t iio_scan_el_ts_show(struct device *dev,
 {
        struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
 
-       return sprintf(buf, "%d\n", buffer->scan_timestamp);
+       return sysfs_emit(buf, "%d\n", buffer->scan_timestamp);
 }
 
 static ssize_t iio_scan_el_ts_store(struct device *dev,
@@ -541,7 +541,7 @@ static ssize_t iio_buffer_read_length(struct device *dev,
 {
        struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
 
-       return sprintf(buf, "%d\n", buffer->length);
+       return sysfs_emit(buf, "%d\n", buffer->length);
 }
 
 static ssize_t iio_buffer_write_length(struct device *dev,
@@ -583,7 +583,7 @@ static ssize_t iio_buffer_show_enable(struct device *dev,
 {
        struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
 
-       return sprintf(buf, "%d\n", iio_buffer_is_active(buffer));
+       return sysfs_emit(buf, "%d\n", iio_buffer_is_active(buffer));
 }
 
 static unsigned int iio_storage_bytes_for_si(struct iio_dev *indio_dev,
@@ -1227,7 +1227,7 @@ static ssize_t iio_buffer_show_watermark(struct device *dev,
 {
        struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
 
-       return sprintf(buf, "%u\n", buffer->watermark);
+       return sysfs_emit(buf, "%u\n", buffer->watermark);
 }
 
 static ssize_t iio_buffer_store_watermark(struct device *dev,
@@ -1271,7 +1271,7 @@ static ssize_t iio_dma_show_data_available(struct device *dev,
 {
        struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
 
-       return sprintf(buf, "%zu\n", iio_buffer_data_available(buffer));
+       return sysfs_emit(buf, "%zu\n", iio_buffer_data_available(buffer));
 }
 
 static DEVICE_ATTR(length, S_IRUGO | S_IWUSR, iio_buffer_read_length,

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index b5750ed..058874a 100644 (file)
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -234,7 +234,7 @@ ssize_t iio_read_const_attr(struct device *dev,
                            struct device_attribute *attr,
                            char *buf)
 {
-       return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
+       return sysfs_emit(buf, "%s\n", to_iio_const_attr(attr)->string);
 }
 EXPORT_SYMBOL(iio_read_const_attr);
 
@@ -529,7 +529,7 @@ ssize_t iio_enum_read(struct iio_dev *indio_dev,
        else if (i >= e->num_items || !e->items[i])
                return -EINVAL;
 
-       return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
+       return sysfs_emit(buf, "%s\n", e->items[i]);
 }
 EXPORT_SYMBOL_GPL(iio_enum_read);
 
@@ -580,10 +580,10 @@ ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
        if (!mtx)
                mtx = &iio_mount_idmatrix;
 
-       return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
-                       mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
-                       mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
-                       mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
+       return sysfs_emit(buf, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
+                         mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
+                         mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
+                         mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
 }
 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
 
@@ -1369,7 +1369,7 @@ static ssize_t iio_show_dev_name(struct device *dev,
                                 char *buf)
 {
        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-       return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
+       return sysfs_emit(buf, "%s\n", indio_dev->name);
 }
 
 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
@@ -1379,7 +1379,7 @@ static ssize_t iio_show_dev_label(struct device *dev,
                                 char *buf)
 {
        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-       return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->label);
+       return sysfs_emit(buf, "%s\n", indio_dev->label);
 }
 
 static DEVICE_ATTR(label, S_IRUGO, iio_show_dev_label, NULL);

diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c
index a30e289..1b3a15b 100644 (file)
--- a/drivers/iio/industrialio-event.c
+++ b/drivers/iio/industrialio-event.c
@@ -297,7 +297,7 @@ static ssize_t iio_ev_state_show(struct device *dev,
        if (val < 0)
                return val;
        else
-               return sprintf(buf, "%d\n", val);
+               return sysfs_emit(buf, "%d\n", val);
 }
 
 static ssize_t iio_ev_value_show(struct device *dev,

diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c
index 32ac1be..efeb5e2 100644 (file)
--- a/drivers/iio/industrialio-trigger.c
+++ b/drivers/iio/industrialio-trigger.c
@@ -50,7 +50,7 @@ static ssize_t iio_trigger_read_name(struct device *dev,
                                     char *buf)
 {
        struct iio_trigger *trig = to_iio_trigger(dev);
-       return sprintf(buf, "%s\n", trig->name);
+       return sysfs_emit(buf, "%s\n", trig->name);
 }
 
 static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
@@ -375,7 +375,7 @@ static ssize_t iio_trigger_read_current(struct device *dev,
        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 
        if (indio_dev->trig)
-               return sprintf(buf, "%s\n", indio_dev->trig->name);
+               return sysfs_emit(buf, "%s\n", indio_dev->trig->name);
        return 0;
 }