643 строки
23 KiB
Plaintext
643 строки
23 KiB
Plaintext
The following is a list of files and features that are going to be
|
|
removed in the kernel source tree. Every entry should contain what
|
|
exactly is going away, why it is happening, and who is going to be doing
|
|
the work. When the feature is removed from the kernel, it should also
|
|
be removed from this file.
|
|
|
|
---------------------------
|
|
|
|
What: x86 floppy disable_hlt
|
|
When: 2012
|
|
Why: ancient workaround of dubious utility clutters the
|
|
code used by everybody else.
|
|
Who: Len Brown <len.brown@intel.com>
|
|
|
|
---------------------------
|
|
|
|
What: CONFIG_APM_CPU_IDLE, and its ability to call APM BIOS in idle
|
|
When: 2012
|
|
Why: This optional sub-feature of APM is of dubious reliability,
|
|
and ancient APM laptops are likely better served by calling HLT.
|
|
Deleting CONFIG_APM_CPU_IDLE allows x86 to stop exporting
|
|
the pm_idle function pointer to modules.
|
|
Who: Len Brown <len.brown@intel.com>
|
|
|
|
----------------------------
|
|
|
|
What: x86_32 "no-hlt" cmdline param
|
|
When: 2012
|
|
Why: remove a branch from idle path, simplify code used by everybody.
|
|
This option disabled the use of HLT in idle and machine_halt()
|
|
for hardware that was flakey 15-years ago. Today we have
|
|
"idle=poll" that removed HLT from idle, and so if such a machine
|
|
is still running the upstream kernel, "idle=poll" is likely sufficient.
|
|
Who: Len Brown <len.brown@intel.com>
|
|
|
|
----------------------------
|
|
|
|
What: x86 "idle=mwait" cmdline param
|
|
When: 2012
|
|
Why: simplify x86 idle code
|
|
Who: Len Brown <len.brown@intel.com>
|
|
|
|
----------------------------
|
|
|
|
What: PRISM54
|
|
When: 2.6.34
|
|
|
|
Why: prism54 FullMAC PCI / Cardbus devices used to be supported only by the
|
|
prism54 wireless driver. After Intersil stopped selling these
|
|
devices in preference for the newer more flexible SoftMAC devices
|
|
a SoftMAC device driver was required and prism54 did not support
|
|
them. The p54pci driver now exists and has been present in the kernel for
|
|
a while. This driver supports both SoftMAC devices and FullMAC devices.
|
|
The main difference between these devices was the amount of memory which
|
|
could be used for the firmware. The SoftMAC devices support a smaller
|
|
amount of memory. Because of this the SoftMAC firmware fits into FullMAC
|
|
devices's memory. p54pci supports not only PCI / Cardbus but also USB
|
|
and SPI. Since p54pci supports all devices prism54 supports
|
|
you will have a conflict. I'm not quite sure how distributions are
|
|
handling this conflict right now. prism54 was kept around due to
|
|
claims users may experience issues when using the SoftMAC driver.
|
|
Time has passed users have not reported issues. If you use prism54
|
|
and for whatever reason you cannot use p54pci please let us know!
|
|
E-mail us at: linux-wireless@vger.kernel.org
|
|
|
|
For more information see the p54 wiki page:
|
|
|
|
http://wireless.kernel.org/en/users/Drivers/p54
|
|
|
|
Who: Luis R. Rodriguez <lrodriguez@atheros.com>
|
|
|
|
---------------------------
|
|
|
|
What: IRQF_SAMPLE_RANDOM
|
|
Check: IRQF_SAMPLE_RANDOM
|
|
When: July 2009
|
|
|
|
Why: Many of IRQF_SAMPLE_RANDOM users are technically bogus as entropy
|
|
sources in the kernel's current entropy model. To resolve this, every
|
|
input point to the kernel's entropy pool needs to better document the
|
|
type of entropy source it actually is. This will be replaced with
|
|
additional add_*_randomness functions in drivers/char/random.c
|
|
|
|
Who: Robin Getz <rgetz@blackfin.uclinux.org> & Matt Mackall <mpm@selenic.com>
|
|
|
|
---------------------------
|
|
|
|
What: Deprecated snapshot ioctls
|
|
When: 2.6.36
|
|
|
|
Why: The ioctls in kernel/power/user.c were marked as deprecated long time
|
|
ago. Now they notify users about that so that they need to replace
|
|
their userspace. After some more time, remove them completely.
|
|
|
|
Who: Jiri Slaby <jirislaby@gmail.com>
|
|
|
|
---------------------------
|
|
|
|
What: The ieee80211_regdom module parameter
|
|
When: March 2010 / desktop catchup
|
|
|
|
Why: This was inherited by the CONFIG_WIRELESS_OLD_REGULATORY code,
|
|
and currently serves as an option for users to define an
|
|
ISO / IEC 3166 alpha2 code for the country they are currently
|
|
present in. Although there are userspace API replacements for this
|
|
through nl80211 distributions haven't yet caught up with implementing
|
|
decent alternatives through standard GUIs. Although available as an
|
|
option through iw or wpa_supplicant its just a matter of time before
|
|
distributions pick up good GUI options for this. The ideal solution
|
|
would actually consist of intelligent designs which would do this for
|
|
the user automatically even when travelling through different countries.
|
|
Until then we leave this module parameter as a compromise.
|
|
|
|
When userspace improves with reasonable widely-available alternatives for
|
|
this we will no longer need this module parameter. This entry hopes that
|
|
by the super-futuristically looking date of "March 2010" we will have
|
|
such replacements widely available.
|
|
|
|
Who: Luis R. Rodriguez <lrodriguez@atheros.com>
|
|
|
|
---------------------------
|
|
|
|
What: dev->power.power_state
|
|
When: July 2007
|
|
Why: Broken design for runtime control over driver power states, confusing
|
|
driver-internal runtime power management with: mechanisms to support
|
|
system-wide sleep state transitions; event codes that distinguish
|
|
different phases of swsusp "sleep" transitions; and userspace policy
|
|
inputs. This framework was never widely used, and most attempts to
|
|
use it were broken. Drivers should instead be exposing domain-specific
|
|
interfaces either to kernel or to userspace.
|
|
Who: Pavel Machek <pavel@ucw.cz>
|
|
|
|
---------------------------
|
|
|
|
What: sys_sysctl
|
|
When: September 2010
|
|
Option: CONFIG_SYSCTL_SYSCALL
|
|
Why: The same information is available in a more convenient from
|
|
/proc/sys, and none of the sysctl variables appear to be
|
|
important performance wise.
|
|
|
|
Binary sysctls are a long standing source of subtle kernel
|
|
bugs and security issues.
|
|
|
|
When I looked several months ago all I could find after
|
|
searching several distributions were 5 user space programs and
|
|
glibc (which falls back to /proc/sys) using this syscall.
|
|
|
|
The man page for sysctl(2) documents it as unusable for user
|
|
space programs.
|
|
|
|
sysctl(2) is not generally ABI compatible to a 32bit user
|
|
space application on a 64bit and a 32bit kernel.
|
|
|
|
For the last several months the policy has been no new binary
|
|
sysctls and no one has put forward an argument to use them.
|
|
|
|
Binary sysctls issues seem to keep happening appearing so
|
|
properly deprecating them (with a warning to user space) and a
|
|
2 year grace warning period will mean eventually we can kill
|
|
them and end the pain.
|
|
|
|
In the mean time individual binary sysctls can be dealt with
|
|
in a piecewise fashion.
|
|
|
|
Who: Eric Biederman <ebiederm@xmission.com>
|
|
|
|
---------------------------
|
|
|
|
What: /proc/<pid>/oom_adj
|
|
When: August 2012
|
|
Why: /proc/<pid>/oom_adj allows userspace to influence the oom killer's
|
|
badness heuristic used to determine which task to kill when the kernel
|
|
is out of memory.
|
|
|
|
The badness heuristic has since been rewritten since the introduction of
|
|
this tunable such that its meaning is deprecated. The value was
|
|
implemented as a bitshift on a score generated by the badness()
|
|
function that did not have any precise units of measure. With the
|
|
rewrite, the score is given as a proportion of available memory to the
|
|
task allocating pages, so using a bitshift which grows the score
|
|
exponentially is, thus, impossible to tune with fine granularity.
|
|
|
|
A much more powerful interface, /proc/<pid>/oom_score_adj, was
|
|
introduced with the oom killer rewrite that allows users to increase or
|
|
decrease the badness() score linearly. This interface will replace
|
|
/proc/<pid>/oom_adj.
|
|
|
|
A warning will be emitted to the kernel log if an application uses this
|
|
deprecated interface. After it is printed once, future warnings will be
|
|
suppressed until the kernel is rebooted.
|
|
|
|
---------------------------
|
|
|
|
What: CS5535/CS5536 obsolete GPIO driver
|
|
When: June 2011
|
|
Files: drivers/staging/cs5535_gpio/*
|
|
Check: drivers/staging/cs5535_gpio/cs5535_gpio.c
|
|
Why: A newer driver replaces this; it is drivers/gpio/cs5535-gpio.c, and
|
|
integrates with the Linux GPIO subsystem. The old driver has been
|
|
moved to staging, and will be removed altogether around 2.6.40.
|
|
Please test the new driver, and ensure that the functionality you
|
|
need and any bugfixes from the old driver are available in the new
|
|
one.
|
|
Who: Andres Salomon <dilinger@queued.net>
|
|
|
|
--------------------------
|
|
|
|
What: remove EXPORT_SYMBOL(kernel_thread)
|
|
When: August 2006
|
|
Files: arch/*/kernel/*_ksyms.c
|
|
Check: kernel_thread
|
|
Why: kernel_thread is a low-level implementation detail. Drivers should
|
|
use the <linux/kthread.h> API instead which shields them from
|
|
implementation details and provides a higherlevel interface that
|
|
prevents bugs and code duplication
|
|
Who: Christoph Hellwig <hch@lst.de>
|
|
|
|
---------------------------
|
|
|
|
What: Unused EXPORT_SYMBOL/EXPORT_SYMBOL_GPL exports
|
|
(temporary transition config option provided until then)
|
|
The transition config option will also be removed at the same time.
|
|
When: before 2.6.19
|
|
Why: Unused symbols are both increasing the size of the kernel binary
|
|
and are often a sign of "wrong API"
|
|
Who: Arjan van de Ven <arjan@linux.intel.com>
|
|
|
|
---------------------------
|
|
|
|
What: PHYSDEVPATH, PHYSDEVBUS, PHYSDEVDRIVER in the uevent environment
|
|
When: October 2008
|
|
Why: The stacking of class devices makes these values misleading and
|
|
inconsistent.
|
|
Class devices should not carry any of these properties, and bus
|
|
devices have SUBSYTEM and DRIVER as a replacement.
|
|
Who: Kay Sievers <kay.sievers@suse.de>
|
|
|
|
---------------------------
|
|
|
|
What: ACPI procfs interface
|
|
When: July 2008
|
|
Why: ACPI sysfs conversion should be finished by January 2008.
|
|
ACPI procfs interface will be removed in July 2008 so that
|
|
there is enough time for the user space to catch up.
|
|
Who: Zhang Rui <rui.zhang@intel.com>
|
|
|
|
---------------------------
|
|
|
|
What: CONFIG_ACPI_PROCFS_POWER
|
|
When: 2.6.39
|
|
Why: sysfs I/F for ACPI power devices, including AC and Battery,
|
|
has been working in upstream kernel since 2.6.24, Sep 2007.
|
|
In 2.6.37, we make the sysfs I/F always built in and this option
|
|
disabled by default.
|
|
Remove this option and the ACPI power procfs interface in 2.6.39.
|
|
Who: Zhang Rui <rui.zhang@intel.com>
|
|
|
|
---------------------------
|
|
|
|
What: /proc/acpi/event
|
|
When: February 2008
|
|
Why: /proc/acpi/event has been replaced by events via the input layer
|
|
and netlink since 2.6.23.
|
|
Who: Len Brown <len.brown@intel.com>
|
|
|
|
---------------------------
|
|
|
|
What: i386/x86_64 bzImage symlinks
|
|
When: April 2010
|
|
|
|
Why: The i386/x86_64 merge provides a symlink to the old bzImage
|
|
location so not yet updated user space tools, e.g. package
|
|
scripts, do not break.
|
|
Who: Thomas Gleixner <tglx@linutronix.de>
|
|
|
|
---------------------------
|
|
|
|
What: GPIO autorequest on gpio_direction_{input,output}() in gpiolib
|
|
When: February 2010
|
|
Why: All callers should use explicit gpio_request()/gpio_free().
|
|
The autorequest mechanism in gpiolib was provided mostly as a
|
|
migration aid for legacy GPIO interfaces (for SOC based GPIOs).
|
|
Those users have now largely migrated. Platforms implementing
|
|
the GPIO interfaces without using gpiolib will see no changes.
|
|
Who: David Brownell <dbrownell@users.sourceforge.net>
|
|
---------------------------
|
|
|
|
What: b43 support for firmware revision < 410
|
|
When: The schedule was July 2008, but it was decided that we are going to keep the
|
|
code as long as there are no major maintanance headaches.
|
|
So it _could_ be removed _any_ time now, if it conflicts with something new.
|
|
Why: The support code for the old firmware hurts code readability/maintainability
|
|
and slightly hurts runtime performance. Bugfixes for the old firmware
|
|
are not provided by Broadcom anymore.
|
|
Who: Michael Buesch <mb@bu3sch.de>
|
|
|
|
---------------------------
|
|
|
|
What: Ability for non root users to shm_get hugetlb pages based on mlock
|
|
resource limits
|
|
When: 2.6.31
|
|
Why: Non root users need to be part of /proc/sys/vm/hugetlb_shm_group or
|
|
have CAP_IPC_LOCK to be able to allocate shm segments backed by
|
|
huge pages. The mlock based rlimit check to allow shm hugetlb is
|
|
inconsistent with mmap based allocations. Hence it is being
|
|
deprecated.
|
|
Who: Ravikiran Thirumalai <kiran@scalex86.org>
|
|
|
|
---------------------------
|
|
|
|
What: CONFIG_THERMAL_HWMON
|
|
When: January 2009
|
|
Why: This option was introduced just to allow older lm-sensors userspace
|
|
to keep working over the upgrade to 2.6.26. At the scheduled time of
|
|
removal fixed lm-sensors (2.x or 3.x) should be readily available.
|
|
Who: Rene Herman <rene.herman@gmail.com>
|
|
|
|
---------------------------
|
|
|
|
What: Code that is now under CONFIG_WIRELESS_EXT_SYSFS
|
|
(in net/core/net-sysfs.c)
|
|
When: After the only user (hal) has seen a release with the patches
|
|
for enough time, probably some time in 2010.
|
|
Why: Over 1K .text/.data size reduction, data is available in other
|
|
ways (ioctls)
|
|
Who: Johannes Berg <johannes@sipsolutions.net>
|
|
|
|
---------------------------
|
|
|
|
What: sysfs ui for changing p4-clockmod parameters
|
|
When: September 2009
|
|
Why: See commits 129f8ae9b1b5be94517da76009ea956e89104ce8 and
|
|
e088e4c9cdb618675874becb91b2fd581ee707e6.
|
|
Removal is subject to fixing any remaining bugs in ACPI which may
|
|
cause the thermal throttling not to happen at the right time.
|
|
Who: Dave Jones <davej@redhat.com>, Matthew Garrett <mjg@redhat.com>
|
|
|
|
-----------------------------
|
|
|
|
What: fakephp and associated sysfs files in /sys/bus/pci/slots/
|
|
When: 2011
|
|
Why: In 2.6.27, the semantics of /sys/bus/pci/slots was redefined to
|
|
represent a machine's physical PCI slots. The change in semantics
|
|
had userspace implications, as the hotplug core no longer allowed
|
|
drivers to create multiple sysfs files per physical slot (required
|
|
for multi-function devices, e.g.). fakephp was seen as a developer's
|
|
tool only, and its interface changed. Too late, we learned that
|
|
there were some users of the fakephp interface.
|
|
|
|
In 2.6.30, the original fakephp interface was restored. At the same
|
|
time, the PCI core gained the ability that fakephp provided, namely
|
|
function-level hot-remove and hot-add.
|
|
|
|
Since the PCI core now provides the same functionality, exposed in:
|
|
|
|
/sys/bus/pci/rescan
|
|
/sys/bus/pci/devices/.../remove
|
|
/sys/bus/pci/devices/.../rescan
|
|
|
|
there is no functional reason to maintain fakephp as well.
|
|
|
|
We will keep the existing module so that 'modprobe fakephp' will
|
|
present the old /sys/bus/pci/slots/... interface for compatibility,
|
|
but users are urged to migrate their applications to the API above.
|
|
|
|
After a reasonable transition period, we will remove the legacy
|
|
fakephp interface.
|
|
Who: Alex Chiang <achiang@hp.com>
|
|
|
|
---------------------------
|
|
|
|
What: CONFIG_RFKILL_INPUT
|
|
When: 2.6.33
|
|
Why: Should be implemented in userspace, policy daemon.
|
|
Who: Johannes Berg <johannes@sipsolutions.net>
|
|
|
|
----------------------------
|
|
|
|
What: sound-slot/service-* module aliases and related clutters in
|
|
sound/sound_core.c
|
|
When: August 2010
|
|
Why: OSS sound_core grabs all legacy minors (0-255) of SOUND_MAJOR
|
|
(14) and requests modules using custom sound-slot/service-*
|
|
module aliases. The only benefit of doing this is allowing
|
|
use of custom module aliases which might as well be considered
|
|
a bug at this point. This preemptive claiming prevents
|
|
alternative OSS implementations.
|
|
|
|
Till the feature is removed, the kernel will be requesting
|
|
both sound-slot/service-* and the standard char-major-* module
|
|
aliases and allow turning off the pre-claiming selectively via
|
|
CONFIG_SOUND_OSS_CORE_PRECLAIM and soundcore.preclaim_oss
|
|
kernel parameter.
|
|
|
|
After the transition phase is complete, both the custom module
|
|
aliases and switches to disable it will go away. This removal
|
|
will also allow making ALSA OSS emulation independent of
|
|
sound_core. The dependency will be broken then too.
|
|
Who: Tejun Heo <tj@kernel.org>
|
|
|
|
----------------------------
|
|
|
|
What: sysfs-class-rfkill state file
|
|
When: Feb 2014
|
|
Files: net/rfkill/core.c
|
|
Why: Documented as obsolete since Feb 2010. This file is limited to 3
|
|
states while the rfkill drivers can have 4 states.
|
|
Who: anybody or Florian Mickler <florian@mickler.org>
|
|
|
|
----------------------------
|
|
|
|
What: sysfs-class-rfkill claim file
|
|
When: Feb 2012
|
|
Files: net/rfkill/core.c
|
|
Why: It is not possible to claim an rfkill driver since 2007. This is
|
|
Documented as obsolete since Feb 2010.
|
|
Who: anybody or Florian Mickler <florian@mickler.org>
|
|
|
|
----------------------------
|
|
|
|
What: KVM paravirt mmu host support
|
|
When: January 2011
|
|
Why: The paravirt mmu host support is slower than non-paravirt mmu, both
|
|
on newer and older hardware. It is already not exposed to the guest,
|
|
and kept only for live migration purposes.
|
|
Who: Avi Kivity <avi@redhat.com>
|
|
|
|
----------------------------
|
|
|
|
What: iwlwifi 50XX module parameters
|
|
When: 2.6.40
|
|
Why: The "..50" modules parameters were used to configure 5000 series and
|
|
up devices; different set of module parameters also available for 4965
|
|
with same functionalities. Consolidate both set into single place
|
|
in drivers/net/wireless/iwlwifi/iwl-agn.c
|
|
|
|
Who: Wey-Yi Guy <wey-yi.w.guy@intel.com>
|
|
|
|
----------------------------
|
|
|
|
What: iwl4965 alias support
|
|
When: 2.6.40
|
|
Why: Internal alias support has been present in module-init-tools for some
|
|
time, the MODULE_ALIAS("iwl4965") boilerplate aliases can be removed
|
|
with no impact.
|
|
|
|
Who: Wey-Yi Guy <wey-yi.w.guy@intel.com>
|
|
|
|
---------------------------
|
|
|
|
What: xt_NOTRACK
|
|
Files: net/netfilter/xt_NOTRACK.c
|
|
When: April 2011
|
|
Why: Superseded by xt_CT
|
|
Who: Netfilter developer team <netfilter-devel@vger.kernel.org>
|
|
|
|
----------------------------
|
|
|
|
What: IRQF_DISABLED
|
|
When: 2.6.36
|
|
Why: The flag is a NOOP as we run interrupt handlers with interrupts disabled
|
|
Who: Thomas Gleixner <tglx@linutronix.de>
|
|
|
|
----------------------------
|
|
|
|
What: PCI DMA unmap state API
|
|
When: August 2012
|
|
Why: PCI DMA unmap state API (include/linux/pci-dma.h) was replaced
|
|
with DMA unmap state API (DMA unmap state API can be used for
|
|
any bus).
|
|
Who: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
|
|
|
|
----------------------------
|
|
|
|
What: DMA_xxBIT_MASK macros
|
|
When: Jun 2011
|
|
Why: DMA_xxBIT_MASK macros were replaced with DMA_BIT_MASK() macros.
|
|
Who: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
|
|
|
|
----------------------------
|
|
|
|
What: iwlwifi disable_hw_scan module parameters
|
|
When: 2.6.40
|
|
Why: Hareware scan is the prefer method for iwlwifi devices for
|
|
scanning operation. Remove software scan support for all the
|
|
iwlwifi devices.
|
|
|
|
Who: Wey-Yi Guy <wey-yi.w.guy@intel.com>
|
|
|
|
----------------------------
|
|
|
|
What: access to nfsd auth cache through sys_nfsservctl or '.' files
|
|
in the 'nfsd' filesystem.
|
|
When: 2.6.40
|
|
Why: This is a legacy interface which have been replaced by a more
|
|
dynamic cache. Continuing to maintain this interface is an
|
|
unnecessary burden.
|
|
Who: NeilBrown <neilb@suse.de>
|
|
|
|
----------------------------
|
|
|
|
What: cancel_rearming_delayed_work[queue]()
|
|
When: 2.6.39
|
|
|
|
Why: The functions have been superceded by cancel_delayed_work_sync()
|
|
quite some time ago. The conversion is trivial and there is no
|
|
in-kernel user left.
|
|
Who: Tejun Heo <tj@kernel.org>
|
|
|
|
----------------------------
|
|
|
|
What: Legacy, non-standard chassis intrusion detection interface.
|
|
When: June 2011
|
|
Why: The adm9240, w83792d and w83793 hardware monitoring drivers have
|
|
legacy interfaces for chassis intrusion detection. A standard
|
|
interface has been added to each driver, so the legacy interface
|
|
can be removed.
|
|
Who: Jean Delvare <khali@linux-fr.org>
|
|
|
|
----------------------------
|
|
|
|
What: xt_connlimit rev 0
|
|
When: 2012
|
|
Who: Jan Engelhardt <jengelh@medozas.de>
|
|
Files: net/netfilter/xt_connlimit.c
|
|
|
|
----------------------------
|
|
|
|
What: noswapaccount kernel command line parameter
|
|
When: 2.6.40
|
|
Why: The original implementation of memsw feature enabled by
|
|
CONFIG_CGROUP_MEM_RES_CTLR_SWAP could be disabled by the noswapaccount
|
|
kernel parameter (introduced in 2.6.29-rc1). Later on, this decision
|
|
turned out to be not ideal because we cannot have the feature compiled
|
|
in and disabled by default and let only interested to enable it
|
|
(e.g. general distribution kernels might need it). Therefore we have
|
|
added swapaccount[=0|1] parameter (introduced in 2.6.37) which provides
|
|
the both possibilities. If we remove noswapaccount we will have
|
|
less command line parameters with the same functionality and we
|
|
can also cleanup the parameter handling a bit ().
|
|
Who: Michal Hocko <mhocko@suse.cz>
|
|
|
|
----------------------------
|
|
|
|
What: ipt_addrtype match include file
|
|
When: 2012
|
|
Why: superseded by xt_addrtype
|
|
Who: Florian Westphal <fw@strlen.de>
|
|
Files: include/linux/netfilter_ipv4/ipt_addrtype.h
|
|
|
|
----------------------------
|
|
|
|
What: i2c_driver.attach_adapter
|
|
i2c_driver.detach_adapter
|
|
When: September 2011
|
|
Why: These legacy callbacks should no longer be used as i2c-core offers
|
|
a variety of preferable alternative ways to instantiate I2C devices.
|
|
Who: Jean Delvare <khali@linux-fr.org>
|
|
|
|
----------------------------
|
|
|
|
What: Support for UVCIOC_CTRL_ADD in the uvcvideo driver
|
|
When: 2.6.42
|
|
Why: The information passed to the driver by this ioctl is now queried
|
|
dynamically from the device.
|
|
Who: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
|
|
|
|
----------------------------
|
|
|
|
What: Support for UVCIOC_CTRL_MAP_OLD in the uvcvideo driver
|
|
When: 2.6.42
|
|
Why: Used only by applications compiled against older driver versions.
|
|
Superseded by UVCIOC_CTRL_MAP which supports V4L2 menu controls.
|
|
Who: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
|
|
|
|
----------------------------
|
|
|
|
What: Support for UVCIOC_CTRL_GET and UVCIOC_CTRL_SET in the uvcvideo driver
|
|
When: 2.6.42
|
|
Why: Superseded by the UVCIOC_CTRL_QUERY ioctl.
|
|
Who: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
|
|
|
|
----------------------------
|
|
|
|
What: Support for driver specific ioctls in the pwc driver (everything
|
|
defined in media/pwc-ioctl.h)
|
|
When: 3.3
|
|
Why: This stems from the v4l1 era, with v4l2 everything can be done with
|
|
standardized v4l2 API calls
|
|
Who: Hans de Goede <hdegoede@redhat.com>
|
|
|
|
----------------------------
|
|
|
|
What: Driver specific sysfs API in the pwc driver
|
|
When: 3.3
|
|
Why: Setting pan/tilt should be done with v4l2 controls, like with other
|
|
cams. The button is available as a standard input device
|
|
Who: Hans de Goede <hdegoede@redhat.com>
|
|
|
|
----------------------------
|
|
|
|
What: Driver specific use of pixfmt.priv in the pwc driver
|
|
When: 3.3
|
|
Why: The .priv field never was intended for this, setting a framerate is
|
|
support using the standardized S_PARM ioctl
|
|
Who: Hans de Goede <hdegoede@redhat.com>
|
|
|
|
----------------------------
|
|
|
|
What: Software emulation of arbritary resolutions in the pwc driver
|
|
When: 3.3
|
|
Why: The pwc driver claims to support any resolution between 160x120
|
|
and 640x480, but emulates this by simply drawing a black border
|
|
around the image. Userspace can draw its own black border if it
|
|
really wants one.
|
|
Who: Hans de Goede <hdegoede@redhat.com>
|
|
|
|
----------------------------
|
|
|
|
What: For VIDIOC_S_FREQUENCY the type field must match the device node's type.
|
|
If not, return -EINVAL.
|
|
When: 3.2
|
|
Why: It makes no sense to switch the tuner to radio mode by calling
|
|
VIDIOC_S_FREQUENCY on a video node, or to switch the tuner to tv mode by
|
|
calling VIDIOC_S_FREQUENCY on a radio node. This is the first step of a
|
|
move to more consistent handling of tv and radio tuners.
|
|
Who: Hans Verkuil <hans.verkuil@cisco.com>
|
|
|
|
----------------------------
|
|
|
|
What: Opening a radio device node will no longer automatically switch the
|
|
tuner mode from tv to radio.
|
|
When: 3.3
|
|
Why: Just opening a V4L device should not change the state of the hardware
|
|
like that. It's very unexpected and against the V4L spec. Instead, you
|
|
switch to radio mode by calling VIDIOC_S_FREQUENCY. This is the second
|
|
and last step of the move to consistent handling of tv and radio tuners.
|
|
Who: Hans Verkuil <hans.verkuil@cisco.com>
|
|
|
|
----------------------------
|