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iio: buffer: Expose data available #26

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Merged
merged 1 commit into from
Dec 12, 2017
Merged

iio: buffer: Expose data available #26

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10 changes: 10 additions & 0 deletions Documentation/ABI/testing/sysfs-bus-iio
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Original file line number Diff line number Diff line change
Expand Up @@ -1390,6 +1390,16 @@ Description:
the available samples after the timeout expires and thus have a
maximum delay guarantee.

What: /sys/bus/iio/devices/iio:deviceX/buffer/data_available
KernelVersion: 4.16
Contact: linux-iio@vger.kernel.org
Description:
A read-only value indicating the bytes of data available in the
buffer. In the case of an output buffer, this indicates the
amount of empty space available to write data to. In the case of
an input buffer, this indicates the amount of data available for
reading.

What: /sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_enabled
KernelVersion: 4.2
Contact: linux-iio@vger.kernel.org
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15 changes: 15 additions & 0 deletions drivers/iio/industrialio-buffer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1121,6 +1121,18 @@ static ssize_t iio_buffer_store_watermark(struct device *dev,
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,
Expand All @@ -1131,11 +1143,14 @@ 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)
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