From e24328974a88aa8541e94e8bb8dfa2ade1b3c45d Mon Sep 17 00:00:00 2001 From: Donggeun Yoo Date: Wed, 2 Sep 2026 00:21:26 +0900 Subject: iio: proximity: vl53l0x-i2c: claim direct mode for raw reads 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 Cc: stable@vger.kernel.org Signed-off-by: Jonathan Cameron --- Documentation/networking/x25.rst | 46 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 Documentation/networking/x25.rst (limited to 'Documentation/networking/x25.rst') diff --git a/Documentation/networking/x25.rst b/Documentation/networking/x25.rst new file mode 100644 index 000000000..e11d9ebdf --- /dev/null +++ b/Documentation/networking/x25.rst @@ -0,0 +1,46 @@ +.. SPDX-License-Identifier: GPL-2.0 + +================== +Linux X.25 Project +================== + +As my third year dissertation at University I have taken it upon myself to +write an X.25 implementation for Linux. My aim is to provide a complete X.25 +Packet Layer and a LAPB module to allow for "normal" X.25 to be run using +Linux. There are two sorts of X.25 cards available, intelligent ones that +implement LAPB on the card itself, and unintelligent ones that simply do +framing, bit-stuffing and checksumming. These both need to be handled by the +system. + +I therefore decided to write the implementation such that as far as the +Packet Layer is concerned, the link layer was being performed by a lower +layer of the Linux kernel and therefore it did not concern itself with +implementation of LAPB. Therefore the LAPB modules would be called by +unintelligent X.25 card drivers and not by intelligent ones, this would +provide a uniform device driver interface, and simplify configuration. + +To confuse matters a little, an 802.2 LLC implementation is also possible +which could allow X.25 to be run over an Ethernet (or Token Ring) and +conform with the JNT "Pink Book", this would have a different interface to +the Packet Layer but there would be no confusion since the class of device +being served by the LLC would be completely separate from LAPB. + +Just when you thought that it could not become more confusing, another +option appeared, XOT. This allows X.25 Packet Layer frames to operate over +the Internet using TCP/IP as a reliable link layer. RFC1613 specifies the +format and behaviour of the protocol. If time permits this option will also +be actively considered. + +A linux-x25 mailing list has been created at vger.kernel.org to support the +development and use of Linux X.25. It is early days yet, but interested +parties are welcome to subscribe to it. Just send a message to +majordomo@vger.kernel.org with the following in the message body: + +subscribe linux-x25 +end + +The contents of the Subject line are ignored. + +Jonathan + +g4klx@g4klx.demon.co.uk -- cgit v1.3.1