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, 71 insertions, 0 deletions

diff --git a/Documentation/fb/tgafb.rst b/Documentation/fb/tgafb.rst
new file mode 100644
index 000000000..f0944da1e
--- /dev/null
+++ b/Documentation/fb/tgafb.rst
@@ -0,0 +1,71 @@
+=======================================
+tgafb - TGA graphics framebuffer driver
+=======================================
+
+This is a driver for DECChip 21030 based graphics framebuffers, a.k.a. TGA
+cards, which are usually found in older Digital Alpha systems. The
+following models are supported:
+
+- ZLxP-E1 (8bpp, 2 MB VRAM)
+- ZLxP-E2 (32bpp, 8 MB VRAM)
+- ZLxP-E3 (32bpp, 16 MB VRAM, Zbuffer)
+
+This version is an almost complete rewrite of the code written by Geert
+Uytterhoeven, which was based on the original TGA console code written by
+Jay Estabrook.
+
+Major new features since Linux 2.0.x:
+
+ * Support for multiple resolutions
+ * Support for fixed-frequency and other oddball monitors
+   (by allowing the video mode to be set at boot time)
+
+User-visible changes since Linux 2.2.x:
+
+ * Sync-on-green is now handled properly
+ * More useful information is printed on bootup
+   (this helps if people run into problems)
+
+This driver does not (yet) support the TGA2 family of framebuffers, so the
+PowerStorm 3D30/4D20 (also known as PBXGB) cards are not supported. These
+can however be used with the standard VGA Text Console driver.
+
+
+Configuration
+=============
+
+You can pass kernel command line options to tgafb with
+`video=tgafb:option1,option2:value2,option3` (multiple options should be
+separated by comma, values are separated from options by `:`).
+
+Accepted options:
+
+==========  ============================================================
+font:X      default font to use. All fonts are supported, including the
+	    SUN12x22 font which is very nice at high resolutions.
+
+mode:X      default video mode. The following video modes are supported:
+	    640x480-60, 800x600-56, 640x480-72, 800x600-60, 800x600-72,
+	    1024x768-60, 1152x864-60, 1024x768-70, 1024x768-76,
+	    1152x864-70, 1280x1024-61, 1024x768-85, 1280x1024-70,
+	    1152x864-84, 1280x1024-76, 1280x1024-85
+==========  ============================================================
+
+
+Known Issues
+============
+
+The XFree86 FBDev server has been reported not to work, since tgafb doesn't do
+mmap(). Running the standard XF86_TGA server from XFree86 3.3.x works fine for
+me, however this server does not do acceleration, which make certain operations
+quite slow. Support for acceleration is being progressively integrated in
+XFree86 4.x.
+
+When running tgafb in resolutions higher than 640x480, on switching VCs from
+tgafb to XF86_TGA 3.3.x, the entire screen is not re-drawn and must be manually
+refreshed. This is an X server problem, not a tgafb problem, and is fixed in
+XFree86 4.0.
+
+Enjoy!
+
+Martin Lucina <mato@kotelna.sk>