Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Mon, 3 Oct 2022 11:12:04 +0300
From:   Matti Vaittinen <mazziesaccount@gmail.com>
To:     Matti Vaittinen <mazziesaccount@gmail.com>,
        Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Cc:     Jonathan Cameron <jic23@kernel.org>,
        Lars-Peter Clausen <lars@metafoo.de>,
        linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 05/10] iio: Add IIO_STATIC_CONST_DEVICE_ATTR
Message-ID: <8dd853dd0ef8eb40cb980cc6f6e7a43166de3afb.1664782676.git.mazziesaccount@gmail.com>
References: <cover.1664782676.git.mazziesaccount@gmail.com>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha256;
        protocol="application/pgp-signature"; boundary="PMtX3tBX+5k3zmY9"
Content-Disposition: inline
In-Reply-To: <cover.1664782676.git.mazziesaccount@gmail.com>
Precedence: bulk


--PMtX3tBX+5k3zmY9
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

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 <mazziesaccount@gmail.com>
---
 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 e51fba66de4b..de5bb125815c 100644
--- a/include/linux/iio/sysfs.h
+++ b/include/linux/iio/sysfs.h
@@ -97,6 +97,17 @@ struct iio_const_attr {
 	=3D { .string =3D _string,						\
 	    .dev_attr =3D __ATTR(_name, S_IRUGO, iio_read_const_attr, NULL)}
=20
+#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 */
=20
 /**
--=20
2.37.3


--=20
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =3D]=20

--PMtX3tBX+5k3zmY9
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----

iQEzBAEBCAAdFiEEIx+f8wZb28fLKEhTeFA3/03aocUFAmM6mVQACgkQeFA3/03a
ocUxWwf/RVaLPhxqo600iGAL6Qf4u7nBOd13/Q879gifov8yywUDPmF3xi+hhFv9
9zgJ0L+GJYeeJambml+Vb0o5jooRskQmm5rIhPeS2LhliYeWasUyTsKfNDhzXzSk
64fEh10jB3DShucP1+AlS+cECkqQtTrauwr6sCgnQ2PfVazDwoet60h5RBaq84W2
EBTbLPYPyQPj6Si8UCH6e7imOrro63c9himyqEI4vRF1xpQlWUeFW3lzHqw4QgiQ
Y2rbOezF76T3mN6WfuJwym28WMg44aLa/cPxedspU/AUeZg6mZl32zj9HzBhppCH
9sndLm7PNJT922DNzSqAdXdnZxR4tA==
=VHHU
-----END PGP SIGNATURE-----

--PMtX3tBX+5k3zmY9--