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![Tejun Heo](/assets/img/avatar_default.png)
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>
378 lines
8.8 KiB
C
378 lines
8.8 KiB
C
/*
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* Force feedback support for Linux input subsystem
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*
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* Copyright (c) 2006 Anssi Hannula <anssi.hannula@gmail.com>
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* Copyright (c) 2006 Dmitry Torokhov <dtor@mail.ru>
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* #define DEBUG */
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#define debug(format, arg...) pr_debug("ff-core: " format "\n", ## arg)
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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/*
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* Check that the effect_id is a valid effect and whether the user
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* is the owner
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*/
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static int check_effect_access(struct ff_device *ff, int effect_id,
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struct file *file)
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{
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if (effect_id < 0 || effect_id >= ff->max_effects ||
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!ff->effect_owners[effect_id])
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return -EINVAL;
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if (file && ff->effect_owners[effect_id] != file)
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return -EACCES;
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return 0;
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}
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/*
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* Checks whether 2 effects can be combined together
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*/
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static inline int check_effects_compatible(struct ff_effect *e1,
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struct ff_effect *e2)
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{
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return e1->type == e2->type &&
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(e1->type != FF_PERIODIC ||
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e1->u.periodic.waveform == e2->u.periodic.waveform);
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}
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/*
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* Convert an effect into compatible one
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*/
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static int compat_effect(struct ff_device *ff, struct ff_effect *effect)
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{
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int magnitude;
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switch (effect->type) {
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case FF_RUMBLE:
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if (!test_bit(FF_PERIODIC, ff->ffbit))
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return -EINVAL;
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/*
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* calculate manginude of sine wave as average of rumble's
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* 2/3 of strong magnitude and 1/3 of weak magnitude
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*/
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magnitude = effect->u.rumble.strong_magnitude / 3 +
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effect->u.rumble.weak_magnitude / 6;
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effect->type = FF_PERIODIC;
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effect->u.periodic.waveform = FF_SINE;
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effect->u.periodic.period = 50;
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effect->u.periodic.magnitude = max(magnitude, 0x7fff);
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effect->u.periodic.offset = 0;
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effect->u.periodic.phase = 0;
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effect->u.periodic.envelope.attack_length = 0;
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effect->u.periodic.envelope.attack_level = 0;
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effect->u.periodic.envelope.fade_length = 0;
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effect->u.periodic.envelope.fade_level = 0;
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return 0;
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default:
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/* Let driver handle conversion */
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return 0;
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}
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}
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/**
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* input_ff_upload() - upload effect into force-feedback device
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* @dev: input device
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* @effect: effect to be uploaded
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* @file: owner of the effect
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*/
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int input_ff_upload(struct input_dev *dev, struct ff_effect *effect,
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struct file *file)
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{
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struct ff_device *ff = dev->ff;
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struct ff_effect *old;
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int ret = 0;
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int id;
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if (!test_bit(EV_FF, dev->evbit))
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return -ENOSYS;
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if (effect->type < FF_EFFECT_MIN || effect->type > FF_EFFECT_MAX ||
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!test_bit(effect->type, dev->ffbit)) {
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debug("invalid or not supported effect type in upload");
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return -EINVAL;
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}
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if (effect->type == FF_PERIODIC &&
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(effect->u.periodic.waveform < FF_WAVEFORM_MIN ||
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effect->u.periodic.waveform > FF_WAVEFORM_MAX ||
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!test_bit(effect->u.periodic.waveform, dev->ffbit))) {
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debug("invalid or not supported wave form in upload");
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return -EINVAL;
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}
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if (!test_bit(effect->type, ff->ffbit)) {
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ret = compat_effect(ff, effect);
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if (ret)
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return ret;
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}
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mutex_lock(&ff->mutex);
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if (effect->id == -1) {
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for (id = 0; id < ff->max_effects; id++)
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if (!ff->effect_owners[id])
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break;
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if (id >= ff->max_effects) {
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ret = -ENOSPC;
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goto out;
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}
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effect->id = id;
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old = NULL;
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} else {
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id = effect->id;
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ret = check_effect_access(ff, id, file);
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if (ret)
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goto out;
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old = &ff->effects[id];
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if (!check_effects_compatible(effect, old)) {
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ret = -EINVAL;
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goto out;
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}
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}
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ret = ff->upload(dev, effect, old);
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if (ret)
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goto out;
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spin_lock_irq(&dev->event_lock);
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ff->effects[id] = *effect;
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ff->effect_owners[id] = file;
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spin_unlock_irq(&dev->event_lock);
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out:
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mutex_unlock(&ff->mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(input_ff_upload);
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/*
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* Erases the effect if the requester is also the effect owner. The mutex
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* should already be locked before calling this function.
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*/
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static int erase_effect(struct input_dev *dev, int effect_id,
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struct file *file)
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{
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struct ff_device *ff = dev->ff;
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int error;
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error = check_effect_access(ff, effect_id, file);
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if (error)
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return error;
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spin_lock_irq(&dev->event_lock);
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ff->playback(dev, effect_id, 0);
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ff->effect_owners[effect_id] = NULL;
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spin_unlock_irq(&dev->event_lock);
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if (ff->erase) {
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error = ff->erase(dev, effect_id);
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if (error) {
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spin_lock_irq(&dev->event_lock);
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ff->effect_owners[effect_id] = file;
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spin_unlock_irq(&dev->event_lock);
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return error;
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}
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}
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return 0;
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}
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/**
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* input_ff_erase - erase a force-feedback effect from device
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* @dev: input device to erase effect from
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* @effect_id: id of the ffect to be erased
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* @file: purported owner of the request
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*
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* This function erases a force-feedback effect from specified device.
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* The effect will only be erased if it was uploaded through the same
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* file handle that is requesting erase.
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*/
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int input_ff_erase(struct input_dev *dev, int effect_id, struct file *file)
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{
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struct ff_device *ff = dev->ff;
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int ret;
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if (!test_bit(EV_FF, dev->evbit))
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return -ENOSYS;
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mutex_lock(&ff->mutex);
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ret = erase_effect(dev, effect_id, file);
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mutex_unlock(&ff->mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(input_ff_erase);
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/*
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* flush_effects - erase all effects owned by a file handle
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*/
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static int flush_effects(struct input_dev *dev, struct file *file)
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{
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struct ff_device *ff = dev->ff;
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int i;
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debug("flushing now");
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mutex_lock(&ff->mutex);
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for (i = 0; i < ff->max_effects; i++)
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erase_effect(dev, i, file);
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mutex_unlock(&ff->mutex);
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return 0;
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}
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/**
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* input_ff_event() - generic handler for force-feedback events
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* @dev: input device to send the effect to
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* @type: event type (anything but EV_FF is ignored)
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* @code: event code
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* @value: event value
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*/
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int input_ff_event(struct input_dev *dev, unsigned int type,
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unsigned int code, int value)
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{
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struct ff_device *ff = dev->ff;
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if (type != EV_FF)
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return 0;
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switch (code) {
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case FF_GAIN:
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if (!test_bit(FF_GAIN, dev->ffbit) || value > 0xffff)
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break;
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ff->set_gain(dev, value);
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break;
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case FF_AUTOCENTER:
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if (!test_bit(FF_AUTOCENTER, dev->ffbit) || value > 0xffff)
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break;
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ff->set_autocenter(dev, value);
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break;
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default:
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if (check_effect_access(ff, code, NULL) == 0)
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ff->playback(dev, code, value);
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break;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(input_ff_event);
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/**
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* input_ff_create() - create force-feedback device
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* @dev: input device supporting force-feedback
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* @max_effects: maximum number of effects supported by the device
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*
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* This function allocates all necessary memory for a force feedback
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* portion of an input device and installs all default handlers.
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* @dev->ffbit should be already set up before calling this function.
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* Once ff device is created you need to setup its upload, erase,
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* playback and other handlers before registering input device
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*/
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int input_ff_create(struct input_dev *dev, int max_effects)
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{
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struct ff_device *ff;
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int i;
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if (!max_effects) {
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printk(KERN_ERR
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"ff-core: cannot allocate device without any effects\n");
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return -EINVAL;
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}
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ff = kzalloc(sizeof(struct ff_device) +
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max_effects * sizeof(struct file *), GFP_KERNEL);
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if (!ff)
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return -ENOMEM;
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ff->effects = kcalloc(max_effects, sizeof(struct ff_effect),
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GFP_KERNEL);
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if (!ff->effects) {
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kfree(ff);
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return -ENOMEM;
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}
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ff->max_effects = max_effects;
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mutex_init(&ff->mutex);
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dev->ff = ff;
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dev->flush = flush_effects;
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dev->event = input_ff_event;
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__set_bit(EV_FF, dev->evbit);
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/* Copy "true" bits into ff device bitmap */
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for (i = 0; i <= FF_MAX; i++)
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if (test_bit(i, dev->ffbit))
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__set_bit(i, ff->ffbit);
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/* we can emulate RUMBLE with periodic effects */
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if (test_bit(FF_PERIODIC, ff->ffbit))
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__set_bit(FF_RUMBLE, dev->ffbit);
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return 0;
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}
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EXPORT_SYMBOL_GPL(input_ff_create);
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/**
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* input_ff_destroy() - frees force feedback portion of input device
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* @dev: input device supporting force feedback
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*
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* This function is only needed in error path as input core will
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* automatically free force feedback structures when device is
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* destroyed.
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*/
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void input_ff_destroy(struct input_dev *dev)
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{
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struct ff_device *ff = dev->ff;
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__clear_bit(EV_FF, dev->evbit);
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if (ff) {
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if (ff->destroy)
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ff->destroy(ff);
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kfree(ff->private);
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kfree(ff->effects);
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kfree(ff);
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dev->ff = NULL;
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}
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}
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EXPORT_SYMBOL_GPL(input_ff_destroy);
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