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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-25 21:54:06 +08:00
linux-next/drivers/input
Mauro Carvalho Chehab 559addc25b [media] fixp-arith: replace sin/cos table by a better precision one
The cos table used at fixp-arith.h has only 8 bits of precision.
That causes problems if it is reused on other drivers.

As some media drivers require a higher precision sin/cos
implementation, replace the current implementation by one that
will provide 32 bits precision.

The values generated by the new implementation matches the
32 bit precision of glibc's sin for an angle measured in
integer degrees.

It also provides support for fractional angles via linear
interpolation. On experimental calculus, when used a table
with a 0.001 degree angle, the maximum error for sin is
0.000038, which is likely good enough for practical purposes.

There are some logic there that seems to be specific to the
usage inside ff-memless.c. Move those logic to there, as they're
not needed elsewhere.

Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Prashant Laddha <prladdha@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
2015-03-02 14:50:06 -03:00
..
gameport Input: initialize device counter variables with -1 2014-12-03 15:27:17 -08:00
joystick Input: adi - remove an unnecessary check 2015-02-11 23:07:13 -08:00
keyboard Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-02-21 12:59:04 -08:00
misc Merge branch 'bfin_rotary' into next 2015-02-15 16:07:18 -08:00
mouse Input: psmouse - use IS_ENABLED instead of homegrown code 2015-02-15 16:08:35 -08:00
serio Merge branch 'bfin_rotary' into next 2015-02-15 16:07:18 -08:00
tablet Input: gtco - use sign_extend32() for sign extension 2015-01-26 23:07:45 -08:00
touchscreen Input: ti_am335x_tsc - replace delta filtering with median filtering 2015-02-03 11:50:39 -08:00
apm-power.c Input: random formatting fixes 2012-08-21 22:29:49 -07:00
evbug.c
evdev.c Input: evdev - do not queue SYN_DROPPED if queue is empty 2015-02-05 19:29:02 -08:00
ff-core.c Input: random formatting fixes 2012-08-21 22:29:49 -07:00
ff-memless.c [media] fixp-arith: replace sin/cos table by a better precision one 2015-03-02 14:50:06 -03:00
input-compat.c compat: Use COMPAT_USE_64BIT_TIME in the input subsystem 2012-02-20 12:48:47 -08:00
input-compat.h compat: Use COMPAT_USE_64BIT_TIME in the input subsystem 2012-02-20 12:48:47 -08:00
input-mt.c Input: MT - add support for balanced slot assignment 2015-02-01 11:50:35 -08:00
input-polldev.c Input: implement managed polled input devices 2014-05-14 16:40:04 -07:00
input.c Input: do not try to filter out events if handler is not a filter 2015-01-08 13:53:34 -08:00
joydev.c Input: fix use-after-free introduced with dynamic minor changes 2012-10-22 08:50:37 +03:00
Kconfig Input: mousedev - allow disabling even without CONFIG_EXPERT 2013-10-31 08:46:07 -07:00
Makefile Input: matrix-keymap - uninline and prepare for device tree support 2012-05-10 22:38:47 -07:00
matrix-keymap.c input: Export matrix_keypad_parse_of_params() 2013-04-19 00:31:13 +02:00
mousedev.c Input: mousedev - fix race when creating mixed device 2014-03-29 14:44:23 -07:00
sparse-keymap.c treewide: Fix typo in Documentation/DocBook 2014-02-19 14:58:17 +01:00