linux-stable.git/drivers/input/touchscreen/sur40.c, branch v4.19.321

Input: sur40 - fix an error code in sur40_probe()

2021-03-04T08:39:47+00:00

[ Upstream commit b0b7d2815839024e5181bd2572f5d8d4f65363b3 ]

If v4l2_ctrl_handler_setup() fails then probe() should return an error
code instead of returning success.

Fixes: cee1e3e2ef39 ("media: add video control handlers using V4L2 control framework")
Signed-off-by: Dan Carpenter 
Link: https://lore.kernel.org/r/YBKFkbATXa5fA3xj@mwanda
Signed-off-by: Dmitry Torokhov 
Signed-off-by: Sasha Levin

Input: sur40 - fix interface sanity checks

2020-01-29T15:43:20+00:00

commit 6b32391ed675827f8425a414abbc6fbd54ea54fe upstream.

Make sure to use the current alternate setting when verifying the
interface descriptors to avoid binding to an invalid interface.

This in turn could cause the driver to misbehave or trigger a WARN() in
usb_submit_urb() that kernels with panic_on_warn set would choke on.

Fixes: bdb5c57f209c ("Input: add sur40 driver for Samsung SUR40 (aka MS Surface 2.0/Pixelsense)")
Signed-off-by: Johan Hovold 
Acked-by: Vladis Dronov 
Link: https://lore.kernel.org/r/20191210113737.4016-8-johan@kernel.org
Signed-off-by: Dmitry Torokhov 
Signed-off-by: Greg Kroah-Hartman

media: add video control handlers using V4L2 control framework

2018-02-14T18:29:55+00:00

This patch registers four standard control handlers using the corresponding
V4L2 framework.

Signed-off-by: Florian Echtler 
[hans.verkuil@cisco.com: lower-cased 0x0F and 0xF0]
Signed-off-by: Hans Verkuil 
Signed-off-by: Mauro Carvalho Chehab

media: add panel register access functions

2018-02-14T18:29:14+00:00

These functions provide write access to the internal LCD panel registers
which also control the sensor. They can be used to disable the
preprocessor, set the illumination brightness, and adjust gain/contrast
(which are stored together in one register internally called "vsvideo").

Signed-off-by: Florian Echtler 
Signed-off-by: Hans Verkuil 
Signed-off-by: Mauro Carvalho Chehab

media: add default settings and module parameters for video controls

2018-02-14T18:28:45+00:00

This patch adds parameter definitions and module parameters for the four
userspace controls that the SUR40 can currently provide.

Signed-off-by: Florian Echtler 
Signed-off-by: Hans Verkuil 
Signed-off-by: Mauro Carvalho Chehab

media: add missing blob structure field for tag id

2018-02-14T18:27:52+00:00

The SUR40 can recognize specific printed patterns directly in hardware;
this information (i.e. the pattern id) is present but currently unused
in the blob structure.

Signed-off-by: Florian Echtler 
Signed-off-by: Hans Verkuil 
Signed-off-by: Mauro Carvalho Chehab

Input: sur40 - skip all blobs that are not touches

2017-07-12T21:20:28+00:00

The SUR40 labels all reported blobs as touch, token, or generic blob.
Previously, all blobs were reported as touch regardless of type, causing
lots of false positives. Present patch fixes this.

Signed-off-by: Martin Kaltenbrunner 
Signed-off-by: Florian Echtler 
Signed-off-by: Dmitry Torokhov

Input: sur40 - silence unnecessary noisy debug output

2017-07-12T21:20:15+00:00

This information is unneccessary, even as debug output.
Leave commented out as documentation of the packet ID quirk.

Signed-off-by: Martin Kaltenbrunner 
Signed-off-by: Florian Echtler 
Signed-off-by: Dmitry Torokhov

Input: sur40 - add additional reverse-engineered information

2017-07-12T21:19:58+00:00

Due to recent reverse engineering efforts, a lot more information is now
available about the internals of the SUR40. We document this in the kernel
driver for future use.

Signed-off-by: Martin Kaltenbrunner 
Signed-off-by: Florian Echtler 
Signed-off-by: Dmitry Torokhov

Input: sur40 - fix bad endianness handling in sur40_poll

2017-04-05T15:52:36+00:00

sparse says:

  sur40.c:372:40: warning: restricted __le32 degrades to integer

the header's data is __le32 so we need to convert it before comparing.

Signed-off-by: Martin Kepplinger 
Signed-off-by: Dmitry Torokhov