Merge tag 'staging-4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...

[linux-2.6-block.git] / drivers / iio / industrialio-buffer.c

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 0bc2fe31f211f0c3fe5ff3e101e62cd67ce6560c..6184c100a94a5cd0f7e94aa998db50b898522bda 100644 (file)
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -1198,6 +1198,18 @@ out:
        return ret ? ret : len;
 }
 
+static ssize_t iio_dma_show_data_available(struct device *dev,
+                                               struct device_attribute *attr,
+                                               char *buf)
+{
+       struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+       size_t bytes;
+
+       bytes = iio_buffer_data_available(indio_dev->buffer);
+
+       return sprintf(buf, "%zu\n", bytes);
+}
+
 static DEVICE_ATTR(length, S_IRUGO | S_IWUSR, iio_buffer_read_length,
                   iio_buffer_write_length);
 static struct device_attribute dev_attr_length_ro = __ATTR(length,
@@ -1208,11 +1220,14 @@ static DEVICE_ATTR(watermark, S_IRUGO | S_IWUSR,
                   iio_buffer_show_watermark, iio_buffer_store_watermark);
 static struct device_attribute dev_attr_watermark_ro = __ATTR(watermark,
        S_IRUGO, iio_buffer_show_watermark, NULL);
+static DEVICE_ATTR(data_available, S_IRUGO,
+               iio_dma_show_data_available, NULL);
 
 static struct attribute *iio_buffer_attrs[] = {
        &dev_attr_length.attr,
        &dev_attr_enable.attr,
        &dev_attr_watermark.attr,
+       &dev_attr_data_available.attr,
 };
 
 int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)