iio: proximity: vl53l0x-i2c: claim direct mode for raw readsgrafted

vl53l0x_read_raw() starts a single-shot ranging measurement and reads
back the result. Once the triggered buffer is enabled the sensor runs in
continuous mode and its data-ready interrupt is routed to the trigger,
so a concurrent in_distance_raw read disturbs the streaming setup and
never gets its completion, returning -ETIMEDOUT.

The original submission claimed direct mode here, but it was dropped
during review because the driver had no buffer support at the time [1].
Continuous (buffered) mode was later added without restoring the
claim [2], reintroducing the conflict.

Reject direct reads while buffered capture is active by claiming direct
mode around the measurement, as the vl53l1x sibling already does.

Fixes: 762186c6e7b1 ("iio: proximity: vl53l0x-i2c: Added continuous mode support")
Link: https://lore.kernel.org/linux-iio/20180911160300.GA9212@himanshu-Vostro-3559/ [1]
Link: https://lore.kernel.org/linux-iio/20240909101508.263085-3-abhashkumarjha123@gmail.com/ [2]
Signed-off-by: Donggeun Yoo <donggeunyoo.kernel@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/Documentation/driver-api/auxiliary_bus.rst b/Documentation/driver-api/auxiliary_bus.rst
new file mode 100644
index 000000000..b236de773
--- /dev/null
+++ b/Documentation/driver-api/auxiliary_bus.rst
@@ -0,0 +1,49 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+.. _auxiliary_bus:
+
+=============
+Auxiliary Bus
+=============
+
+.. kernel-doc:: drivers/base/auxiliary.c
+   :doc: PURPOSE
+
+When Should the Auxiliary Bus Be Used
+=====================================
+
+.. kernel-doc:: drivers/base/auxiliary.c
+   :doc: USAGE
+
+
+Auxiliary Device Creation
+=========================
+
+.. kernel-doc:: include/linux/auxiliary_bus.h
+   :identifiers: auxiliary_device
+
+.. kernel-doc:: drivers/base/auxiliary.c
+   :identifiers: auxiliary_device_init __auxiliary_device_add
+
+Auxiliary Device Memory Model and Lifespan
+------------------------------------------
+
+.. kernel-doc:: include/linux/auxiliary_bus.h
+   :doc: DEVICE_LIFESPAN
+
+
+Auxiliary Drivers
+=================
+
+.. kernel-doc:: include/linux/auxiliary_bus.h
+   :identifiers: auxiliary_driver module_auxiliary_driver
+
+.. kernel-doc:: drivers/base/auxiliary.c
+   :identifiers: __auxiliary_driver_register auxiliary_driver_unregister
+
+Example Usage
+=============
+
+.. kernel-doc:: drivers/base/auxiliary.c
+   :doc: EXAMPLE
+