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authorLars-Peter Clausen <lars@metafoo.de>2015-10-13 18:10:26 +0200
committerJonathan Cameron <jic23@kernel.org>2015-10-25 13:51:11 +0000
commitb440655b896b2d5a2fb5f918801fb0e281a537cd (patch)
tree7a576b45c21d5856bc189c2e5aaa099a5a74723f /drivers/iio/industrialio-buffer.c
parent4a60535726d90bfad16b5c52dcffaeede9fb84a9 (diff)
iio: Add support for indicating fixed watermarks
For buffers which have a fixed wake-up watermark the watermark attribute should be read-only. Add a new FIXED_WATERMARK flag to the struct iio_buffer_access_funcs, which can be set by a buffer implementation. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/industrialio-buffer.c')
-rw-r--r--drivers/iio/industrialio-buffer.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 5f2c8c8c436e..98a6447a61d3 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -998,6 +998,8 @@ static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR,
iio_buffer_show_enable, iio_buffer_store_enable);
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 struct attribute *iio_buffer_attrs[] = {
&dev_attr_length.attr,
@@ -1040,6 +1042,9 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
if (!buffer->access->set_length)
attr[0] = &dev_attr_length_ro.attr;
+ if (buffer->access->flags & INDIO_BUFFER_FLAG_FIXED_WATERMARK)
+ attr[2] = &dev_attr_watermark_ro.attr;
+
if (buffer->attrs)
memcpy(&attr[ARRAY_SIZE(iio_buffer_attrs)], buffer->attrs,
sizeof(struct attribute *) * attrcount);