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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260113-b4-ad9467-optional-backend-v2-2-0a27e7e72f41@vaisala.com> References: <20260113-b4-ad9467-optional-backend-v2-0-0a27e7e72f41@vaisala.com> In-Reply-To: <20260113-b4-ad9467-optional-backend-v2-0-0a27e7e72f41@vaisala.com> To: Michael Hennerich , Nuno Sa , Lars-Peter Clausen , Jonathan Cameron , David Lechner , Andy Shevchenko , Olivier Moysan Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Tomas Melin X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1768306378; l=3143; i=tomas.melin@vaisala.com; s=20251125; h=from:subject:message-id; bh=Tsvdxgnl3p8Vs26XTl6yfezdc6vA26x3+u8ySZwd7tA=; b=d20+lXecN8XbM8a0mzvqpRhHQ10vkiDPkljFP9RyLeyz/hlWXobI+INkE/H3y5YDR70yY/3zm 2ubzoCaruK8C2mBPl8Vn8Vez9HhRFtVPW8j6LLshFdX57vwfBumZm81 X-Developer-Key: i=tomas.melin@vaisala.com; a=ed25519; pk=6lMiecjZ+OeyZuxYsDm/ADy9D1JKvYrKdsYv58PMepU= X-ClientProxiedBy: GVX0EPF0005F6A1.SWEP280.PROD.OUTLOOK.COM (2603:10a6:158:400::129) To AMBPR06MB10365.eurprd06.prod.outlook.com (2603:10a6:20b:6f0::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AMBPR06MB10365:EE_|DUZPR06MB8963:EE_ X-MS-Office365-Filtering-Correlation-Id: 77395586-b953-4222-9f87-08de529d185b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|52116014|366016|1800799024|38350700014; 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Capability bits can be used in frontends and backends for checking for a certain feature set, or if using related functions can be expected to fail. Capability bits should be set by a compatible backend and provided when registering the backend. Signed-off-by: Tomas Melin --- drivers/iio/industrialio-backend.c | 10 ++++++++++ include/linux/iio/backend.h | 9 +++++++++ 2 files changed, 19 insertions(+) diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-= backend.c index 447b694d6d5f72dc6f018b1697fdb88e555bd61e..997ec743dc67e7cf420ff667af3= 3b4f6a71a5377 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -62,6 +62,7 @@ struct iio_backend { * backend. Used for the debugfs directory name. */ u8 idx; + u32 caps; }; =20 /* @@ -542,6 +543,9 @@ int devm_iio_backend_request_buffer(struct device *dev, struct iio_backend_buffer_pair *pair; struct iio_buffer *buffer; =20 + if (!iio_backend_caps(back, IIO_BACKEND_CAP_BUFFERING)) + return 0; + pair =3D devm_kzalloc(dev, sizeof(*pair), GFP_KERNEL); if (!pair) return -ENOMEM; @@ -774,6 +778,12 @@ int iio_backend_extend_chan_spec(struct iio_backend *b= ack, } EXPORT_SYMBOL_NS_GPL(iio_backend_extend_chan_spec, "IIO_BACKEND"); =20 +int iio_backend_caps(struct iio_backend *back, u32 cap) +{ + return back->caps & cap; +} +EXPORT_SYMBOL_NS_GPL(iio_backend_caps, "IIO_BACKEND"); + static void iio_backend_release(void *arg) { struct iio_backend *back =3D arg; diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h index 7f815f3fed6ae34c65ffc579d5101020fc9bd336..c020bc48cc05d6fcea00d23e471= b12a29b5c0551 100644 --- a/include/linux/iio/backend.h +++ b/include/linux/iio/backend.h @@ -84,6 +84,12 @@ enum iio_backend_filter_type { IIO_BACKEND_FILTER_TYPE_MAX }; =20 +enum iio_backend_capabilities { + IIO_BACKEND_CAP_TEST_PATTERNS =3D BIT(0), + IIO_BACKEND_CAP_BUFFERING =3D BIT(1), + IIO_BACKEND_CAP_CALIBRATION =3D BIT(2) +}; + /** * struct iio_backend_ops - operations structure for an iio_backend * @enable: Enable backend. @@ -179,10 +185,12 @@ struct iio_backend_ops { * struct iio_backend_info - info structure for an iio_backend * @name: Backend name. * @ops: Backend operations. + * @caps: Backend capabilities. */ struct iio_backend_info { const char *name; const struct iio_backend_ops *ops; + u32 caps; }; =20 int iio_backend_chan_enable(struct iio_backend *back, unsigned int chan); @@ -235,6 +243,7 @@ int iio_backend_read_raw(struct iio_backend *back, long mask); int iio_backend_extend_chan_spec(struct iio_backend *back, struct iio_chan_spec *chan); +int iio_backend_caps(struct iio_backend *back, u32 cap); void *iio_backend_get_priv(const struct iio_backend *conv); struct iio_backend *devm_iio_backend_get(struct device *dev, const char *n= ame); struct iio_backend *devm_iio_backend_fwnode_get(struct device *dev, --=20 2.47.3