Commit Graph

15 Commits

Author SHA1 Message Date
Dmitry Torokhov 5e3e4eb1bf Input: polldev - immediately poll device upon opening
To allow open/ioctl(EVIOCGABS)/close use pattern for polled devices read
the device in context of open() call instead of offloading the first read
to a workqueue. This will ensure that once call to open() returns device
would have cached reasonably recent axis values that can be retrieved via
appropriate ioctl.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2011-08-09 01:32:45 -07:00
Dmitry Torokhov e490ebdc3c Input: input-polldev - use system-wide freezable workqueue
With introduction of concurrency-managed work queues there is rarely
a point in creating private workqueues.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2011-04-27 23:22:01 -07:00
Dmitry Torokhov 2546bcc2d6 Input: input-polldev - fix a couple of typos
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2011-01-31 21:17:41 -08:00
Joe Perches da0c490115 Input: use pr_fmt and pr_<level>
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2010-11-30 23:10:26 -08:00
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00
Samu Onkalo d9c4f84699 Input: polldev can cause crash in case when polling disabled
When polled input device is opened and closed and there are no other
users of polled device, the workqueue is created and destroyed in
every open / close operation. It is probable that at some point
dynamic allocation of internal parts of the workqueue cause changes to the
workqueue.

When a work is queued to the workqueue the work struct contains pointers
to the workqueue data. If the workqueue has been changed and the work
has never been queued to the new workqueue, work-struct contains pointers
to the non-existing workqueue. This will cause crash at the work
cancellation during device close since cancellation of a work assumes
that the workqueue exists.

To prevent that, work struct is cleaned up at device close. This keeps
work struct clean for the next use.

Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2010-02-20 01:23:55 -08:00
Dmitry Torokhov 36203c4f3d Input: add generic support for sparse keymaps
More and more devices choose to reimplement support for sparse keymaps
first introduced by wistron driver. Move it into a library module so it
can be easily used by interested parties.

Reviewed-by: Anisse Astier <anisse@astier.eu>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2009-12-07 09:26:35 -08:00
Samu Onkalo 11bb4cc7c7 Input: polled device - do not start polling if interval is zero
If the poll interval is set to 0 via new sysfs entry and device is
opened after that, polling is started with interval 0. This causes
huge CPU load. Same happens if the rate was 0 when the device was
closed and then reopened.

Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2009-11-23 10:16:09 -08:00
Dmitry Torokhov 381f3f1ccf Input: polled device - schedule first poll immediately
It does not make sense to wait poll_interval before performing first
read after opening the device, schedule the read immediately instead.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2009-11-23 10:15:40 -08:00
Samu Onkalo dad725d089 Input: input-polldev - add sysfs interface for controlling poll interval
Sysfs entry for reading and setting of the polling interval. If the
interval is set to 0, polling is stopped. Polling is restarted when
interval is changed to non-zero.

sysfs entries:
poll = current polling interval in msec (RW)
max = max allowed polling interval (RO)
min = min allowed polling interval (RO)

Minimum and maximum limit for interval can be set while setting up the
device.

Interval can be adjusted even if the input device is not currently open.

[dtor@mail.ru: add kernel doc markup for the new fields]
Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2009-11-20 00:52:09 -08:00
Samu Onkalo b0aba1e66c Input: add open and close methods for polled devices
Optional open and close methods for preparing and closing
the device.

Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2009-10-18 00:46:49 -07:00
Dmitry Torokhov 3797fec171 Input: remove private member from input_dev structure
Everyone should be using input_{get|set}_drvdata() by now.
Alias them to dev_{get|set}_drvdata() and remove ->private.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2008-04-02 00:41:00 -04:00
Stephen Hemminger 374766bc2a Input: implement proper timer rounding for polled devices
Rounding doesn't matter for the first tick, but we want
succeeding ticks to be aligned on second boundary if poll
interval is large enough.

Also: cancel_rearming_delayed_workqueue is marked as obsolete
in workqueue.h so use cancel_delayed_work_sync.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2008-01-21 01:11:07 -05:00
Stephen Hemminger 14134b31ae Input: polled device power saving
For slow running polling, it saves power to align wakeups on tick boundary.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2007-09-26 00:01:25 -04:00
Dmitry Torokhov 893e7c2db0 Input: move input-polldev to drivers/input
To work around deficiences in Kconfig that allows to "select"
a symbol without automatically selecting all dependencies for
that symbol move input-polldev from drivers/input/misc to
drivers/input thus removing extra dependency on CONFIG_INPUT_MISC.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2007-06-13 01:49:58 -04:00