Commit 2cc64a23 authored by Matti Vaittinen's avatar Matti Vaittinen Committed by Jonathan Cameron
Browse files

iio: Add IIO_STATIC_CONST_DEVICE_ATTR 



Add IIO_STATIC_CONST_DEVICE_ATTR macro for creating an read-only
iio_dev_attr which returns constant value. This macro is intended to be
used when replacing the IIO_CONST_ATTR - attributes for triggered
buffers because the triggered buffer attributes must be of type
iio_dev_attr.

Signed-off-by: default avatarMatti Vaittinen <mazziesaccount@gmail.com>
Link: https://lore.kernel.org/r/8dd853dd0ef8eb40cb980cc6f6e7a43166de3afb.1664782676.git.mazziesaccount@gmail.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 6abcb19e

include/linux/iio/sysfs.h

+11 −0
Original line number Diff line number Diff line
@@ -97,6 +97,17 @@ struct iio_const_attr { 
	= { .string = _string,						\

	    .dev_attr = __ATTR(_name, S_IRUGO, iio_read_const_attr, NULL)}



#define IIO_STATIC_CONST_DEVICE_ATTR(_name, _string)				\

	static ssize_t iio_const_dev_attr_show_##_name(			\

					struct device *dev,		\

					struct device_attribute *attr,	\

					char *buf)			\

	{								\

		return sysfs_emit(buf, "%s\n", _string);		\

	}								\

	static IIO_DEVICE_ATTR(_name, 0444,				\

			       iio_const_dev_attr_show_##_name, NULL, 0)



/* Generic attributes of onetype or another */



/**