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path: root/drivers/input/ff-core.c
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* Input: document and check on implicitly defined FF_MAX_EFFECTSElias Vanderstuyft2015-10-161-0/+5
| | | | | | | | | | | | | | | | | | | | There is an undocumented upper bound for the total number of ff effects: FF_GAIN (= 96). This can be found as follows: - user: write(EV_FF, effect_id, iterations) calls kernel: ff->playback(effect_id, ...): starts effect "effect_id" - user: write(EV_FF, FF_GAIN, gain) calls kernel: ff->set_gain(gain, ...): sets gain A collision occurs when effect_id equals FF_GAIN. According to input_ff_event(), FF_GAIN is the smallest value where a collision occurs. Therefore the greatest safe value for effect_id is FF_GAIN - 1, and thus the total number of effects should never exceed FF_GAIN. Define FF_MAX_EFFECTS as FF_GAIN and check on this limit in ff-core. Signed-off-by: Elias Vanderstuyft <elias.vds@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
* Input: ff-core - silence an underflow warningDan Carpenter2015-09-291-2/+2
| | | | | | | | | | My static checker complains that "value" comes from the user in evdev_do_ioctl() and we check that it's not too large here but we don't check that it's negative. It's harmless because the ->set_gain() and ->set_autocenter() functions truncate it to a valid u16 value, but we may as well fix it just to make the static checker happy. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
* Input: ff-core - use for_each_set_bit where appropriateAnshul Garg2015-07-081-3/+2
| | | | | | | Use for_each_set_bit to check for set bits in bitmap as it is more efficient than checking individual bits. Signed-off-by: Anshul Garg <aksgarg1989@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
* Input: ff-core - fix typo in comment to input_ff_erase()Shailendra Verma2015-05-201-1/+1
| | | | | Signed-off-by: Shailendra Verma <shailendra.capricorn@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
* Input: ff-core - fix spelling mistake in ff-coreDan Murphy2015-05-081-1/+1
| | | | | | | | Fix spelling of magnitude s/manginude/magnitude Signed-off-by: Dan Murphy <dmurphy@ti.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
* Input: ff-core - use new debug macrosOliver Neukum2015-04-141-6/+4
| | | | | | | Replace old pr_* with dev_* debugging macros Signed-off-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
* Input: random formatting fixesBaodong Chen2012-08-211-2/+2
| | | | | | | | Fixes for some coding style issues reported by scripts/checkpatch.pl utility. Signed-off-by: Baodong Chen <chenbdchenbd@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
* Input: force feedback - potential integer wrap in input_ff_create()Dan Carpenter2011-10-121-3/+8
| | | | | | | | | | | | | | | | | | | | | The problem here is that max_effects can wrap on 32 bits systems. We'd allocate a smaller amount of data than sizeof(struct ff_device). The call to kcalloc() on the next line would fail but it would write the NULL return outside of the memory we just allocated causing data corruption. The call path is that uinput_setup_device() get ->ff_effects_max from the user and sets the value in the ->private_data struct. From there it is: -> uinput_ioctl_handler() -> uinput_create_device() -> input_ff_create(dev, udev->ff_effects_max); I've also changed ff_effects_max so it's an unsigned int instead of a signed int as a cleanup. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: use pr_fmt and pr_<level>Joe Perches2010-11-301-6/+5
| | | | | Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* include cleanup: Update gfp.h and slab.h includes to prepare for breaking ↵Tejun Heo2010-03-301-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* Input: fix memory leak in force feedback coreJari Vanhala2009-12-041-0/+1
| | | | | | | Effects were allocated, but not freed anywhere. Signed-off-by: Jari Vanhala <ext-jari.vanhala@nokia.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Merge commit 'v2.6.32' into nextDmitry Torokhov2009-12-021-9/+11
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| * Input: fix locking in memoryless force-feedback devicesDmitry Torokhov2009-11-101-9/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that input core acquires dev->event_lock spinlock and disables interrupts when propagating input events, using spin_lock_bh() in ff-memless driver is not allowed. Actually, the timer_lock itself is not needed anymore, we should simply use dev->event_lock as well. Also do a small cleanup in force-feedback core. Reported-by: kerneloops.org Reported-by: http://www.kerneloops.org/searchweek.php?search=ml_ff_set_gain Reported-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* | Input: force feedback - fix function name in commentRoger Quadros2009-11-231-1/+1
|/ | | | | | | Function name is input_ff_destroy() and not input_ff_free() Signed-off-by: Roger Quadros <roger.quadros@nokia.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* drivers/input/ff-core.c needs <linux/sched.h>Geert Uytterhoeven2008-07-021-0/+1
| | | | | | | | | | | | | | | | | | | Commit 656acd2bbc4ce7f224de499ee255698701396c48 ("Input: fix locking in force-feedback core") causes the following regression on m68k: | linux/drivers/input/ff-core.c: In function 'input_ff_upload': | linux/drivers/input/ff-core.c:172: error: dereferencing pointer to incomplete type | linux/drivers/input/ff-core.c: In function 'erase_effect': | linux/drivers/input/ff-core.c:197: error: dereferencing pointer to incomplete type | linux/drivers/input/ff-core.c:204: error: dereferencing pointer to incomplete type | make[4]: *** [drivers/input/ff-core.o] Error 1 As the incomplete type is `struct task_struct', including <linux/sched.h> fixes it. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Input: fix locking in force-feedback coreDmitry Torokhov2008-06-301-6/+11
| | | | | | | | | | | The newly added event_lock spinlock in the input core disallows sleeping and therefore using mutexes in event handlers. Convert force-feedback core to rely on event_lock instead of mutex to protect slots allocated for fore-feedback effects. The original mutex is still used to serialize uploading and erasing of effects. Reported-by: Anssi Hannula <anssi.hannula@gmail.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: force feedback - make sure effect is present before playingDmitry Torokhov2007-05-031-1/+2
| | | | | | | | | Make sure that requested effect id is not out of range for the device and that effect is present before requesting device to play it. Reported-by: Jan Kratochvil <honza@jikos.cz> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: add to kernel-api docbookRandy Dunlap2006-11-241-2/+2
| | | | | | | | Add input subsystem to kernel-api docbook. Enhance some function and parameter comments. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: implement new force feedback interfaceAnssi Hannula2006-07-191-0/+367
Implement a new force feedback interface, in which all non-driver-specific operations are separated to a common module. This includes handling effect type validations, locking, etc. The effects are now file descriptor specific instead of the previous strange half-process half-fd specific behaviour. The effect memory of devices is not emptied if the root user opens and closes the device while another user is using effects. This is a minor change and most likely no force feedback aware programs are affected by this negatively. Otherwise the userspace interface is left unaltered. Signed-off-by: Anssi Hannula <anssi.hannula@gmail.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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