2006-07-18 23:40:30 -06:00
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/*
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* Force feedback support for memoryless devices
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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-memless: " 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/spinlock.h>
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[PATCH] remove many unneeded #includes of sched.h
After Al Viro (finally) succeeded in removing the sched.h #include in module.h
recently, it makes sense again to remove other superfluous sched.h includes.
There are quite a lot of files which include it but don't actually need
anything defined in there. Presumably these includes were once needed for
macros that used to live in sched.h, but moved to other header files in the
course of cleaning it up.
To ease the pain, this time I did not fiddle with any header files and only
removed #includes from .c-files, which tend to cause less trouble.
Compile tested against 2.6.20-rc2 and 2.6.20-rc2-mm2 (with offsets) on alpha,
arm, i386, ia64, mips, powerpc, and x86_64 with allnoconfig, defconfig,
allmodconfig, and allyesconfig as well as a few randconfigs on x86_64 and all
configs in arch/arm/configs on arm. I also checked that no new warnings were
introduced by the patch (actually, some warnings are removed that were emitted
by unnecessarily included header files).
Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-14 01:33:14 -07:00
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#include <linux/jiffies.h>
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2006-07-18 23:40:30 -06:00
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#include "fixp-arith.h"
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Anssi Hannula <anssi.hannula@gmail.com>");
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MODULE_DESCRIPTION("Force feedback support for memoryless devices");
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/* Number of effects handled with memoryless devices */
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#define FF_MEMLESS_EFFECTS 16
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/* Envelope update interval in ms */
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#define FF_ENVELOPE_INTERVAL 50
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#define FF_EFFECT_STARTED 0
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#define FF_EFFECT_PLAYING 1
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#define FF_EFFECT_ABORTING 2
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struct ml_effect_state {
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struct ff_effect *effect;
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unsigned long flags; /* effect state (STARTED, PLAYING, etc) */
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int count; /* loop count of the effect */
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unsigned long play_at; /* start time */
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unsigned long stop_at; /* stop time */
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unsigned long adj_at; /* last time the effect was sent */
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};
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struct ml_device {
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void *private;
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struct ml_effect_state states[FF_MEMLESS_EFFECTS];
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int gain;
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struct timer_list timer;
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spinlock_t timer_lock;
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struct input_dev *dev;
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int (*play_effect)(struct input_dev *dev, void *data,
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struct ff_effect *effect);
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};
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static const struct ff_envelope *get_envelope(const struct ff_effect *effect)
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{
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static const struct ff_envelope empty_envelope;
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switch (effect->type) {
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case FF_PERIODIC:
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return &effect->u.periodic.envelope;
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case FF_CONSTANT:
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return &effect->u.constant.envelope;
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default:
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return &empty_envelope;
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}
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}
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/*
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* Check for the next time envelope requires an update on memoryless devices
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*/
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static unsigned long calculate_next_time(struct ml_effect_state *state)
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{
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const struct ff_envelope *envelope = get_envelope(state->effect);
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unsigned long attack_stop, fade_start, next_fade;
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if (envelope->attack_length) {
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attack_stop = state->play_at +
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msecs_to_jiffies(envelope->attack_length);
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if (time_before(state->adj_at, attack_stop))
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return state->adj_at +
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msecs_to_jiffies(FF_ENVELOPE_INTERVAL);
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}
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if (state->effect->replay.length) {
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if (envelope->fade_length) {
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/* check when fading should start */
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fade_start = state->stop_at -
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msecs_to_jiffies(envelope->fade_length);
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if (time_before(state->adj_at, fade_start))
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return fade_start;
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/* already fading, advance to next checkpoint */
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next_fade = state->adj_at +
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msecs_to_jiffies(FF_ENVELOPE_INTERVAL);
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if (time_before(next_fade, state->stop_at))
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return next_fade;
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}
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return state->stop_at;
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}
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return state->play_at;
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}
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static void ml_schedule_timer(struct ml_device *ml)
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{
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struct ml_effect_state *state;
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unsigned long now = jiffies;
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unsigned long earliest = 0;
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unsigned long next_at;
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int events = 0;
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int i;
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debug("calculating next timer");
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for (i = 0; i < FF_MEMLESS_EFFECTS; i++) {
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state = &ml->states[i];
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if (!test_bit(FF_EFFECT_STARTED, &state->flags))
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continue;
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if (test_bit(FF_EFFECT_PLAYING, &state->flags))
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next_at = calculate_next_time(state);
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else
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next_at = state->play_at;
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if (time_before_eq(now, next_at) &&
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(++events == 1 || time_before(next_at, earliest)))
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earliest = next_at;
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}
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if (!events) {
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debug("no actions");
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del_timer(&ml->timer);
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} else {
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debug("timer set");
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mod_timer(&ml->timer, earliest);
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}
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}
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/*
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* Apply an envelope to a value
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*/
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static int apply_envelope(struct ml_effect_state *state, int value,
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struct ff_envelope *envelope)
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{
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struct ff_effect *effect = state->effect;
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unsigned long now = jiffies;
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int time_from_level;
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int time_of_envelope;
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int envelope_level;
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int difference;
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if (envelope->attack_length &&
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time_before(now,
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state->play_at + msecs_to_jiffies(envelope->attack_length))) {
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debug("value = 0x%x, attack_level = 0x%x", value,
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envelope->attack_level);
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time_from_level = jiffies_to_msecs(now - state->play_at);
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time_of_envelope = envelope->attack_length;
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envelope_level = min_t(__s16, envelope->attack_level, 0x7fff);
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} else if (envelope->fade_length && effect->replay.length &&
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time_after(now,
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state->stop_at - msecs_to_jiffies(envelope->fade_length)) &&
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time_before(now, state->stop_at)) {
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time_from_level = jiffies_to_msecs(state->stop_at - now);
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time_of_envelope = envelope->fade_length;
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envelope_level = min_t(__s16, envelope->fade_level, 0x7fff);
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} else
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return value;
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difference = abs(value) - envelope_level;
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debug("difference = %d", difference);
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debug("time_from_level = 0x%x", time_from_level);
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debug("time_of_envelope = 0x%x", time_of_envelope);
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difference = difference * time_from_level / time_of_envelope;
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debug("difference = %d", difference);
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return value < 0 ?
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-(difference + envelope_level) : (difference + envelope_level);
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}
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/*
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* Return the type the effect has to be converted into (memless devices)
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*/
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static int get_compatible_type(struct ff_device *ff, int effect_type)
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{
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if (test_bit(effect_type, ff->ffbit))
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return effect_type;
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if (effect_type == FF_PERIODIC && test_bit(FF_RUMBLE, ff->ffbit))
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return FF_RUMBLE;
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printk(KERN_ERR
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"ff-memless: invalid type in get_compatible_type()\n");
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return 0;
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}
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/*
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* Combine two effects and apply gain.
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*/
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static void ml_combine_effects(struct ff_effect *effect,
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struct ml_effect_state *state,
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int gain)
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{
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struct ff_effect *new = state->effect;
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unsigned int strong, weak, i;
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int x, y;
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fixp_t level;
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switch (new->type) {
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case FF_CONSTANT:
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i = new->direction * 360 / 0xffff;
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level = fixp_new16(apply_envelope(state,
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new->u.constant.level,
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&new->u.constant.envelope));
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x = fixp_mult(fixp_sin(i), level) * gain / 0xffff;
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y = fixp_mult(-fixp_cos(i), level) * gain / 0xffff;
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/*
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* here we abuse ff_ramp to hold x and y of constant force
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* If in future any driver wants something else than x and y
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* in s8, this should be changed to something more generic
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*/
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effect->u.ramp.start_level =
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2008-05-05 09:50:59 -06:00
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clamp_val(effect->u.ramp.start_level + x, -0x80, 0x7f);
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2006-07-18 23:40:30 -06:00
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effect->u.ramp.end_level =
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2008-05-05 09:50:59 -06:00
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clamp_val(effect->u.ramp.end_level + y, -0x80, 0x7f);
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2006-07-18 23:40:30 -06:00
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break;
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case FF_RUMBLE:
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strong = new->u.rumble.strong_magnitude * gain / 0xffff;
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weak = new->u.rumble.weak_magnitude * gain / 0xffff;
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effect->u.rumble.strong_magnitude =
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min(strong + effect->u.rumble.strong_magnitude,
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0xffffU);
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effect->u.rumble.weak_magnitude =
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min(weak + effect->u.rumble.weak_magnitude, 0xffffU);
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break;
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case FF_PERIODIC:
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i = apply_envelope(state, abs(new->u.periodic.magnitude),
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&new->u.periodic.envelope);
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/* here we also scale it 0x7fff => 0xffff */
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i = i * gain / 0x7fff;
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effect->u.rumble.strong_magnitude =
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min(i + effect->u.rumble.strong_magnitude, 0xffffU);
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effect->u.rumble.weak_magnitude =
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min(i + effect->u.rumble.weak_magnitude, 0xffffU);
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break;
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default:
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printk(KERN_ERR "ff-memless: invalid type in ml_combine_effects()\n");
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break;
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}
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}
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/*
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* Because memoryless devices have only one effect per effect type active
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* at one time we have to combine multiple effects into one
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*/
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static int ml_get_combo_effect(struct ml_device *ml,
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unsigned long *effect_handled,
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struct ff_effect *combo_effect)
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{
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struct ff_effect *effect;
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struct ml_effect_state *state;
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int effect_type;
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int i;
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memset(combo_effect, 0, sizeof(struct ff_effect));
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for (i = 0; i < FF_MEMLESS_EFFECTS; i++) {
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if (__test_and_set_bit(i, effect_handled))
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continue;
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state = &ml->states[i];
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effect = state->effect;
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if (!test_bit(FF_EFFECT_STARTED, &state->flags))
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continue;
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if (time_before(jiffies, state->play_at))
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continue;
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/*
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* here we have started effects that are either
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* currently playing (and may need be aborted)
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* or need to start playing.
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*/
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effect_type = get_compatible_type(ml->dev->ff, effect->type);
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if (combo_effect->type != effect_type) {
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if (combo_effect->type != 0) {
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__clear_bit(i, effect_handled);
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continue;
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}
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combo_effect->type = effect_type;
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}
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if (__test_and_clear_bit(FF_EFFECT_ABORTING, &state->flags)) {
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__clear_bit(FF_EFFECT_PLAYING, &state->flags);
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__clear_bit(FF_EFFECT_STARTED, &state->flags);
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} else if (effect->replay.length &&
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time_after_eq(jiffies, state->stop_at)) {
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__clear_bit(FF_EFFECT_PLAYING, &state->flags);
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if (--state->count <= 0) {
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__clear_bit(FF_EFFECT_STARTED, &state->flags);
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} else {
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state->play_at = jiffies +
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msecs_to_jiffies(effect->replay.delay);
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state->stop_at = state->play_at +
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msecs_to_jiffies(effect->replay.length);
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}
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} else {
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__set_bit(FF_EFFECT_PLAYING, &state->flags);
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state->adj_at = jiffies;
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ml_combine_effects(combo_effect, state, ml->gain);
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}
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}
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return combo_effect->type != 0;
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}
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static void ml_play_effects(struct ml_device *ml)
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{
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struct ff_effect effect;
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DECLARE_BITMAP(handled_bm, FF_MEMLESS_EFFECTS);
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memset(handled_bm, 0, sizeof(handled_bm));
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while (ml_get_combo_effect(ml, handled_bm, &effect))
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ml->play_effect(ml->dev, ml->private, &effect);
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ml_schedule_timer(ml);
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}
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static void ml_effect_timer(unsigned long timer_data)
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{
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struct input_dev *dev = (struct input_dev *)timer_data;
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struct ml_device *ml = dev->ff->private;
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debug("timer: updating effects");
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spin_lock(&ml->timer_lock);
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ml_play_effects(ml);
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spin_unlock(&ml->timer_lock);
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}
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static void ml_ff_set_gain(struct input_dev *dev, u16 gain)
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{
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struct ml_device *ml = dev->ff->private;
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int i;
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spin_lock_bh(&ml->timer_lock);
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ml->gain = gain;
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for (i = 0; i < FF_MEMLESS_EFFECTS; i++)
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__clear_bit(FF_EFFECT_PLAYING, &ml->states[i].flags);
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ml_play_effects(ml);
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spin_unlock_bh(&ml->timer_lock);
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}
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static int ml_ff_playback(struct input_dev *dev, int effect_id, int value)
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{
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struct ml_device *ml = dev->ff->private;
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struct ml_effect_state *state = &ml->states[effect_id];
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spin_lock_bh(&ml->timer_lock);
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if (value > 0) {
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debug("initiated play");
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__set_bit(FF_EFFECT_STARTED, &state->flags);
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state->count = value;
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state->play_at = jiffies +
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msecs_to_jiffies(state->effect->replay.delay);
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state->stop_at = state->play_at +
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msecs_to_jiffies(state->effect->replay.length);
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state->adj_at = state->play_at;
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ml_schedule_timer(ml);
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} else {
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debug("initiated stop");
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if (test_bit(FF_EFFECT_PLAYING, &state->flags))
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__set_bit(FF_EFFECT_ABORTING, &state->flags);
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else
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__clear_bit(FF_EFFECT_STARTED, &state->flags);
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ml_play_effects(ml);
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}
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spin_unlock_bh(&ml->timer_lock);
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return 0;
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}
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static int ml_ff_upload(struct input_dev *dev,
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struct ff_effect *effect, struct ff_effect *old)
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{
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struct ml_device *ml = dev->ff->private;
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struct ml_effect_state *state = &ml->states[effect->id];
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spin_lock_bh(&ml->timer_lock);
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if (test_bit(FF_EFFECT_STARTED, &state->flags)) {
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__clear_bit(FF_EFFECT_PLAYING, &state->flags);
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state->play_at = jiffies +
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msecs_to_jiffies(state->effect->replay.delay);
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state->stop_at = state->play_at +
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msecs_to_jiffies(state->effect->replay.length);
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state->adj_at = state->play_at;
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ml_schedule_timer(ml);
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}
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spin_unlock_bh(&ml->timer_lock);
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return 0;
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}
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static void ml_ff_destroy(struct ff_device *ff)
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{
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struct ml_device *ml = ff->private;
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kfree(ml->private);
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}
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/**
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2006-11-23 22:43:09 -07:00
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* input_ff_create_memless() - create memoryless force-feedback device
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2006-07-18 23:40:30 -06:00
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* @dev: input device supporting force-feedback
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* @data: driver-specific data to be passed into @play_effect
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* @play_effect: driver-specific method for playing FF effect
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*/
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int input_ff_create_memless(struct input_dev *dev, void *data,
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int (*play_effect)(struct input_dev *, void *, struct ff_effect *))
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{
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struct ml_device *ml;
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struct ff_device *ff;
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int error;
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int i;
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ml = kzalloc(sizeof(struct ml_device), GFP_KERNEL);
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if (!ml)
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return -ENOMEM;
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ml->dev = dev;
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ml->private = data;
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ml->play_effect = play_effect;
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ml->gain = 0xffff;
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spin_lock_init(&ml->timer_lock);
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setup_timer(&ml->timer, ml_effect_timer, (unsigned long)dev);
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set_bit(FF_GAIN, dev->ffbit);
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error = input_ff_create(dev, FF_MEMLESS_EFFECTS);
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if (error) {
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kfree(ml);
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return error;
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}
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ff = dev->ff;
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ff->private = ml;
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ff->upload = ml_ff_upload;
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ff->playback = ml_ff_playback;
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ff->set_gain = ml_ff_set_gain;
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ff->destroy = ml_ff_destroy;
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/* we can emulate periodic effects with RUMBLE */
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|
|
if (test_bit(FF_RUMBLE, ff->ffbit)) {
|
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|
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set_bit(FF_PERIODIC, dev->ffbit);
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set_bit(FF_SINE, dev->ffbit);
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set_bit(FF_TRIANGLE, dev->ffbit);
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set_bit(FF_SQUARE, dev->ffbit);
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}
|
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|
for (i = 0; i < FF_MEMLESS_EFFECTS; i++)
|
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|
|
ml->states[i].effect = &ff->effects[i];
|
|
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|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(input_ff_create_memless);
|