From 2cc64a23c4e26107887af23a62f8ba3c79ff7ab5 Mon Sep 17 00:00:00 2001 From: Matti Vaittinen Date: Mon, 3 Oct 2022 11:12:04 +0300 Subject: [PATCH] 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: Matti Vaittinen Link: https://lore.kernel.org/r/8dd853dd0ef8eb40cb980cc6f6e7a43166de3afb.1664782676.git.mazziesaccount@gmail.com Signed-off-by: Jonathan Cameron --- include/linux/iio/sysfs.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/iio/sysfs.h b/include/linux/iio/sysfs.h index e51fba6..de5bb12 100644 --- a/include/linux/iio/sysfs.h +++ b/include/linux/iio/sysfs.h @@ -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 */ /** -- 2.7.4