iio: buffer: Expose data available
Add a sysfs attribute that exposes buffer data available to userspace. This attribute can be checked at runtime to determine the overall buffer fill level (across all allocated buffers). Signed-off-by: Matt Fornero <matt.fornero@mathworks.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1413,6 +1413,16 @@ Description:
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the available samples after the timeout expires and thus have a
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the available samples after the timeout expires and thus have a
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maximum delay guarantee.
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maximum delay guarantee.
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What: /sys/bus/iio/devices/iio:deviceX/buffer/data_available
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KernelVersion: 4.16
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Contact: linux-iio@vger.kernel.org
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Description:
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A read-only value indicating the bytes of data available in the
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buffer. In the case of an output buffer, this indicates the
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amount of empty space available to write data to. In the case of
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an input buffer, this indicates the amount of data available for
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reading.
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What: /sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_enabled
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What: /sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_enabled
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KernelVersion: 4.2
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KernelVersion: 4.2
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Contact: linux-iio@vger.kernel.org
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Contact: linux-iio@vger.kernel.org
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@ -1198,6 +1198,18 @@ out:
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return ret ? ret : len;
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return ret ? ret : len;
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}
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}
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static ssize_t iio_dma_show_data_available(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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size_t bytes;
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bytes = iio_buffer_data_available(indio_dev->buffer);
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return sprintf(buf, "%zu\n", bytes);
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}
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static DEVICE_ATTR(length, S_IRUGO | S_IWUSR, iio_buffer_read_length,
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static DEVICE_ATTR(length, S_IRUGO | S_IWUSR, iio_buffer_read_length,
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iio_buffer_write_length);
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iio_buffer_write_length);
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static struct device_attribute dev_attr_length_ro = __ATTR(length,
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static struct device_attribute dev_attr_length_ro = __ATTR(length,
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@ -1208,11 +1220,14 @@ static DEVICE_ATTR(watermark, S_IRUGO | S_IWUSR,
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iio_buffer_show_watermark, iio_buffer_store_watermark);
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iio_buffer_show_watermark, iio_buffer_store_watermark);
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static struct device_attribute dev_attr_watermark_ro = __ATTR(watermark,
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static struct device_attribute dev_attr_watermark_ro = __ATTR(watermark,
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S_IRUGO, iio_buffer_show_watermark, NULL);
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S_IRUGO, iio_buffer_show_watermark, NULL);
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static DEVICE_ATTR(data_available, S_IRUGO,
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iio_dma_show_data_available, NULL);
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static struct attribute *iio_buffer_attrs[] = {
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static struct attribute *iio_buffer_attrs[] = {
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&dev_attr_length.attr,
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&dev_attr_length.attr,
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&dev_attr_enable.attr,
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&dev_attr_enable.attr,
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&dev_attr_watermark.attr,
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&dev_attr_watermark.attr,
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&dev_attr_data_available.attr,
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};
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};
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int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
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int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
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