linux-toradex.git/drivers/media/v4l2-core/Makefile, branch master

media: v4l2-core: Introduce v4l2-isp.c

2025-11-14T14:48:48+00:00

Add to the V4L2 framework helper functions to support drivers when
validating a buffer of V4L2 ISP parameters.

Driver shall use v4l2_isp_params_validate_buffer_size() to verify the
size correctness of the data received from userspace, and after having
copied the data to a kernel-only memory location, complete the
validation by calling v4l2_isp_params_validate_buffer().

Reviewed-by: Daniel Scally 
Reviewed-by: Laurent Pinchart 
Reviewed-by: Michael Riesch 
Acked-by: Sakari Ailus 
Tested-by: Lad Prabhakar 
Signed-off-by: Jacopo Mondi 
Signed-off-by: Hans Verkuil

media: remove the old videobuf framework

2023-09-27T07:40:01+00:00

The last driver that still used this old framework has been converted
to the videobuf2 framework. So it is now time to delete the old videobuf
code.

Signed-off-by: Hans Verkuil 
Reviewed-by: Hans de Goede

media: Add MIPI CCI register access helper functions

2023-08-10T05:58:38+00:00

The CSI2 specification specifies a standard method to access camera sensor
registers called "Camera Control Interface (CCI)".

This uses either 8 or 16 bit (big-endian wire order) register addresses
and supports 8, 16, 24 or 32 bit (big-endian wire order) register widths.

Currently a lot of Linux camera sensor drivers all have their own custom
helpers for this, often copy and pasted from other drivers.

Add a set of generic helpers for this so that all sensor drivers can
switch to a single common implementation.

These helpers take an extra optional "int *err" function parameter,
this can be used to chain a bunch of register accesses together with
only a single error check at the end, rather than needing to error
check each individual register access. The first failing call will
set the contents of err to a non 0 value and all other calls will
then become no-ops.

Link: https://lore.kernel.org/linux-media/59aefa7f-7bf9-6736-6040-39551329cd0a@redhat.com/

Reviewed-by: Andy Shevchenko 
Tested-by: Tommaso Merciai 
Reviewed-by: Tommaso Merciai 
Signed-off-by: Hans de Goede 
Signed-off-by: Sakari Ailus 
Signed-off-by: Mauro Carvalho Chehab

media: Kconfig: cleanup VIDEO_DEV dependencies

2022-03-18T04:58:35+00:00

media Kconfig has two entries associated to V4L API:
VIDEO_DEV and VIDEO_V4L2.

On Kernel 2.6.x, there were two V4L APIs, each one with its own flag.
VIDEO_DEV were meant to:
	1) enable Video4Linux and make its Kconfig options to appear;
	2) it makes the Kernel build the V4L core.

while VIDEO_V4L2 where used to distinguish between drivers that
implement the newer API and drivers that implemented the former one.

With time, such meaning changed, specially after the removal of
all V4L version 1 drivers.

At the current implementation, VIDEO_DEV only does (1): it enables
the media options related to V4L, that now has:

	menu "Video4Linux options"
		visible if VIDEO_DEV

	source "drivers/media/v4l2-core/Kconfig"
	endmenu

but it doesn't affect anymore the V4L core drivers.

The rationale is that the V4L2 core has a "soft" dependency
at the I2C bus, and now requires to select a number of other
Kconfig options:

	config VIDEO_V4L2
		tristate
		depends on (I2C || I2C=n) && VIDEO_DEV
		select RATIONAL
		select VIDEOBUF2_V4L2 if VIDEOBUF2_CORE
		default (I2C || I2C=n) && VIDEO_DEV

In the past, merging them would be tricky, but it seems that it is now
possible to merge those symbols, in order to simplify V4L dependencies.

Let's keep VIDEO_DEV, as this one is used on some make *defconfig
configurations.

Suggested-by: Laurent Pinchart 
Reviewed-by: Laurent Pinchart 
Reviewed-by: Jacopo Mondi 
Reviewed-by: Neil Armstrong  # for meson-vdec & meson-ge2d
Acked-by: Andrzej Pietrasiewicz 
Acked-by: Łukasz Stelmach 
Signed-off-by: Mauro Carvalho Chehab

media: Makefiles: sort entries where it fits

2022-03-14T08:42:59+00:00

Alphabetically sort entries at the Makefiles per group,
in ASCII order, e. g., using the output of:

	$ LC_ALL=C sort Makefile |grep obj-y
	...
	$ LC_ALL=C sort Makefile |grep obj.*CONFIG
	...

Reviewed-by: Laurent Pinchart 
Signed-off-by: Mauro Carvalho Chehab

media: Add VP9 v4l2 library

2021-11-22T07:47:13+00:00

Provide code common to vp9 drivers in one central location.

Signed-off-by: Andrzej Pietrasiewicz 
Signed-off-by: Ezequiel Garcia 
Signed-off-by: Hans Verkuil 
Signed-off-by: Mauro Carvalho Chehab

media: v4l: async, fwnode: Improve module organisation

2021-06-02T09:46:27+00:00

The V4L2 async framework is generally used with the V4L2 fwnode, which
also depends on the former. There are a few exceptions but they are
relatively few.

At the same time there is a vast number of systems that need videodev
module, but have no use for v4l2-async that's now part of videodev.

In order to improve, split the v4l2-async into its own module. Selecting
V4L2_FWNODE also selects V4L2_ASYNC.

This also moves the initialisation of the debufs entries for async subdevs
to loading of the v4l2-async module. The directory is named as
"v4l2-async".

Signed-off-by: Sakari Ailus 
Reviewed-by: Ezequiel Garcia 
Signed-off-by: Mauro Carvalho Chehab

media: v4l2-ctrls: split up into four source files

2021-05-25T15:03:29+00:00

The v4l2-ctrls.c source has become much too big, so split it up
into four separate parts:

v4l2-ctrls-core.c: contains the core framework code
v4l2-ctrls-api.c: contains the uAPI interface to the framework
v4l2-ctrls-defs.c: contains the control definitions
v4l2-ctrls-request.c: contains the Request API helpers

And it adds a new v4l2-ctrls-priv.h.

No code was changed, but a number of checkpatch.pl warnings were
fixed (alignment, f == NULL -> !f, long comment block coding style,
unsigned -> unsigned int).

The copyright statements were updated as well since they were
quite out of date.

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

media: Remove the legacy v4l2-clk API

2021-02-06T08:39:44+00:00

The V4L2 temporary clock helper API, was introduced
in late 2012 and, as mentioned in the documentation,
meant to be replaced by the generic clock API,
once the generic clock framework became available
on all relevant architectures.

The generic clock API is a well-established API (since a few
years now). The last few media capture drivers and sensors
using v4l2-clk have been converted to the generic clock framework.

We can now remove the v4l2-clk API.

Signed-off-by: Ezequiel Garcia 
Acked-by: Petr Cvek 
Signed-off-by: Sakari Ailus 
Signed-off-by: Mauro Carvalho Chehab

media: v4l2-core: Add helpers to build the H264 P/B0/B1 reflists

2020-04-21T11:46:40+00:00

Building those list is a standard procedure described in section
'8.2.4 Decoding process for reference picture lists construction' of
the H264 specification.

We already have 2 drivers needing the same logic (hantro and rkvdec) and
I suspect we will soon have more.

Let's provide generic helpers to create those lists.

Signed-off-by: Boris Brezillon 
Signed-off-by: Ezequiel Garcia 
Signed-off-by: Hans Verkuil 
Signed-off-by: Mauro Carvalho Chehab