rust: device: add drvdata accessors

Implement generic accessors for the private data of a driver bound to a
device.

Those accessors should be used by bus abstractions from their
corresponding core callbacks, such as probe(), remove(), etc.

Implementing them for device::CoreInternal guarantees that driver's can't
interfere with the logic implemented by the bus abstraction.

Acked-by: Benno Lossin <lossin@kernel.org>
Link: https://lore.kernel.org/r/20250621195118.124245-3-dakr@kernel.org
[ Improve safety comment as proposed by Benno. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/rust/helpers/device.c b/rust/helpers/device.c
index 502fef7e9ae8..9a4316bafedf 100644
--- a/rust/helpers/device.c
+++ b/rust/helpers/device.c
@@ -15,3 +15,13 @@ int rust_helper_devm_add_action_or_reset(struct device *dev,
 {
 	return devm_add_action_or_reset(dev, action, data);
 }
+
+void *rust_helper_dev_get_drvdata(const struct device *dev)
+{
+	return dev_get_drvdata(dev);
+}
+
+void rust_helper_dev_set_drvdata(struct device *dev, void *data)
+{
+	dev_set_drvdata(dev, data);
+}