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Subject[RFC] Add ff-memless-next driver
Date
Hi,

"ff-memless-next" driver is an extended modification of the original ff-memless driver. Unlike ff-memless, ff-memless-next targets only "serious" FFB devices such as racing wheels and hi(ish)-end joysticks with FFB actuators instead of simple rumble motors. Modifications in ff-memless-next include:
- Support of periodic and ramp effects
These are treated as "combinable" effects and forces created by each of these effects is superposed into one total force
- Support for conditional effects
As these effects cannot be effectively combined together, they are handled separately depending on the capabilities of the underlying HW-specific driver
- Removed emulation of rumble effect
- Adjustable update rate
- Differentiation between "set effect's force to zero" and "stop effect"
- Checks whether the effect's parameters are valid upon upload - this should better be handled by ff-core though IMHO.

At the moment there is no HW-specific backend that would make use of ff-memless-next, the plan is to update hid-lg4ff once ff-memless-next gets accepted by upstream. ff-memless-next can be tested with dummy FFB device module which is available here (git://prifuk.cz/ff-dummy-device).

My primary motivation to write ff-memless-next were limitations of the current ff-memless driver I came across during work on the driver for Logitech gaming wheels. However, ff-memless-next contains no code that would specifically target Logitech devices.

I must give a huge thanks to Elias Vanderstuyft (CC'd) for his extensive testing of the driver and numerous helpful suggestions.

Tested-by: Elias Vanderstuyft <elias.vds@gmail.com>
Signed-off-by: Michal Malý <madcatxster@prifuk.cz>
---
From 12c7feb547ff16d91f6d04986862eaf5f266ddeb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michal=20Mal=C3=BD?= <madcatxster@prifuk.cz>
Date: Sat, 14 Dec 2013 21:53:26 +0100
Subject: [PATCH 1/1] Add ff-memless-next driver

---
drivers/input/Kconfig | 12 +
drivers/input/Makefile | 1 +
drivers/input/ff-memless-next.c | 675 ++++++++++++++++++++++++++++++++++
include/linux/input/ff-memless-next.h | 29 ++
4 files changed, 717 insertions(+)
create mode 100644 drivers/input/ff-memless-next.c
create mode 100644 include/linux/input/ff-memless-next.h

diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig
index a11ff74..893ab00 100644
--- a/drivers/input/Kconfig
+++ b/drivers/input/Kconfig
@@ -77,6 +77,18 @@ config INPUT_MATRIXKMAP
To compile this driver as a module, choose M here: the
module will be called matrix-keymap.

+config INPUT_FF_MEMLESS_NEXT
+ tristate "New version of support for memoryless force feedback devices"
+ help
+ Say Y here if you want to enable support for various memoryless
+ force feedback devices (as of now there is no hardware-specific
+ driver that supports this)
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ff-memless-next.
+
comment "Userland interfaces"

config INPUT_MOUSEDEV
diff --git a/drivers/input/Makefile b/drivers/input/Makefile
index 5ca3f63..169e99c 100644
--- a/drivers/input/Makefile
+++ b/drivers/input/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_INPUT_FF_MEMLESS) += ff-memless.o
obj-$(CONFIG_INPUT_POLLDEV) += input-polldev.o
obj-$(CONFIG_INPUT_SPARSEKMAP) += sparse-keymap.o
obj-$(CONFIG_INPUT_MATRIXKMAP) += matrix-keymap.o
+obj-$(CONFIG_INPUT_FF_MEMLESS_NEXT) += ff-memless-next.o

obj-$(CONFIG_INPUT_MOUSEDEV) += mousedev.o
obj-$(CONFIG_INPUT_JOYDEV) += joydev.o
diff --git a/drivers/input/ff-memless-next.c b/drivers/input/ff-memless-next.c
new file mode 100644
index 0000000..23727b2
--- /dev/null
+++ b/drivers/input/ff-memless-next.c
@@ -0,0 +1,675 @@
+/*
+ *
+ * Force feedback support for memory-less devices
+ *
+ * This module is based on "ff-memless" orignally written by Anssi Hannula.
+ * It is extented to support all force feedback effects currently supported
+ * by the Linux input stack. All effects except FF_RAMP are handled in accordance with
+ * Microsoft DirectInput specification valid at the time the module was written.
+ *
+ * Copyright(c) 2013 Michal Maly <madcatxster@prifuk.cz>
+ *
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/jiffies.h>
+#include <linux/fixp-arith.h>
+#include <linux/input/ff-memless-next.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michal \"MadCatX\" Maly");
+MODULE_DESCRIPTION("Force feedback support for memoryless force feedback devices");
+
+#define FF_MAX_EFFECTS 16
+#define FF_MIN_UPDATE_RATE_MSECS 5
+
+#define FF_EFFECT_STARTED 0x0
+#define FF_EFFECT_PLAYING 0x1
+
+
+struct mlnx_effect {
+ struct ff_effect *effect;
+ unsigned long flags;
+ unsigned long begin_at;
+ unsigned long stop_at;
+ unsigned long updated_at;
+ unsigned long attack_stop;
+ unsigned long fade_begin;
+ int repeat;
+ u16 playback_time;
+};
+
+struct mlnx_device {
+ u8 combinable_playing;
+ unsigned long update_rate_jiffies;
+ void *private;
+ struct mlnx_effect effects[FF_MAX_EFFECTS];
+ int gain;
+ struct timer_list timer;
+ struct input_dev *dev;
+
+ int (*control_effect)(struct input_dev *, void *, const struct mlnx_effect_command *);
+};
+
+static inline s32 mlnx_calculate_x_force(const s32 level, const u16 direction)
+{
+ s32 new = (level * -fixp_sin(direction)) >> FRAC_N;
+ pr_debug("x force: %d\n", new);
+ return new;
+}
+
+static inline s32 mlnx_calculate_y_force(const s32 level, const u16 direction)
+{
+ s32 new = (level * -fixp_cos(direction)) >> FRAC_N;
+ pr_debug("y force: %d\n", new);
+ return new;
+}
+
+static inline s32 mlnx_clamp_level(const s32 level)
+{
+ return (level > 0x7fff) ? 0x7fff : ((level < -0x7fff) ? -0x7fff : level);
+}
+
+static inline int mlnx_is_conditional(const struct ff_effect *effect)
+{
+ return (effect->type == FF_DAMPER) || (effect->type == FF_FRICTION) || (effect->type == FF_INERTIA) || (effect->type == FF_SPRING);
+}
+
+static void mlnx_set_envelope_times(struct mlnx_effect *mlnxeff)
+{
+ struct ff_effect *effect = mlnxeff->effect;
+ switch (effect->type) {
+ case FF_CONSTANT:
+ if (effect->u.constant.envelope.attack_length)
+ mlnxeff->attack_stop = mlnxeff->begin_at + msecs_to_jiffies(effect->u.constant.envelope.attack_length);
+ if (effect->replay.length && effect->u.constant.envelope.fade_length)
+ mlnxeff->fade_begin = mlnxeff->stop_at - msecs_to_jiffies(effect->u.constant.envelope.fade_length);
+ break;
+ case FF_PERIODIC:
+ pr_debug("Phase: %u, Offset: %d\n", effect->u.periodic.phase, effect->u.periodic.offset);
+ if (effect->u.periodic.envelope.attack_length)
+ mlnxeff->attack_stop = mlnxeff->begin_at + msecs_to_jiffies(effect->u.periodic.envelope.attack_length);
+ if (effect->replay.length && effect->u.periodic.envelope.fade_length)
+ mlnxeff->fade_begin = mlnxeff->stop_at - msecs_to_jiffies(effect->u.periodic.envelope.fade_length);
+ break;
+ case FF_RAMP:
+ if (effect->u.ramp.envelope.attack_length)
+ mlnxeff->attack_stop = mlnxeff->begin_at + msecs_to_jiffies(effect->u.ramp.envelope.attack_length);
+ if (effect->replay.length && effect->u.ramp.envelope.fade_length)
+ mlnxeff->fade_begin = mlnxeff->stop_at - msecs_to_jiffies(effect->u.ramp.envelope.fade_length);
+ break;
+ default:
+ break;
+ }
+}
+
+static void mlnx_set_trip_times(struct mlnx_effect *mlnxeff, const unsigned long now)
+{
+ mlnxeff->begin_at = now + msecs_to_jiffies(mlnxeff->effect->replay.delay);
+ mlnxeff->stop_at = mlnxeff->begin_at + msecs_to_jiffies(mlnxeff->effect->replay.length);
+ mlnxeff->updated_at = mlnxeff->begin_at;
+ if (mlnxeff->effect->type == FF_PERIODIC) {
+ mlnxeff->playback_time = mlnxeff->effect->u.periodic.phase;
+ /* Adjust periodic effects phase accordingly to Microsoft DirectInput specification */
+ switch (mlnxeff->effect->u.periodic.waveform) {
+ case FF_TRIANGLE:
+ mlnxeff->playback_time += mlnxeff->effect->u.periodic.period / 4;
+ break;
+ default:
+ break;
+ }
+ }
+}
+
+static void mlnx_start_effect(struct mlnx_device *mlnxdev, struct mlnx_effect *mlnxeff)
+{
+ const unsigned long now = jiffies;
+
+ mlnx_set_trip_times(mlnxeff, now);
+ mlnx_set_envelope_times(mlnxeff);
+ __set_bit(FF_EFFECT_STARTED, &mlnxeff->flags);
+}
+
+static void mlnx_stop_effect(struct mlnx_device *mlnxdev, struct mlnx_effect *mlnxeff, const int idx)
+{
+ switch (mlnxeff->effect->type) {
+ case FF_CONSTANT:
+ case FF_PERIODIC:
+ if (--mlnxdev->combinable_playing == 0) {
+ const struct mlnx_effect_command c = { .cmd = MLNX_STOP_COMBINED };
+ mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private, &c);
+ }
+ return;
+ case FF_DAMPER:
+ case FF_FRICTION:
+ case FF_INERTIA:
+ case FF_SPRING:
+ {
+ const struct mlnx_effect_command c = { .cmd = MLNX_STOP_UNCOMB,
+ .u.uncomb.id = idx,
+ .u.uncomb.effect = mlnxeff->effect };
+ mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private, &c);
+ return;
+ }
+ default:
+ return;
+ }
+}
+
+static const struct ff_envelope *mlnx_get_envelope(const struct ff_effect *effect)
+{
+ static const struct ff_envelope empty;
+
+ switch (effect->type) {
+ case FF_CONSTANT:
+ return &effect->u.constant.envelope;
+ case FF_PERIODIC:
+ return &effect->u.periodic.envelope;
+ case FF_RAMP:
+ return &effect->u.ramp.envelope;
+ default:
+ return &empty;
+ }
+}
+
+static s32 mlnx_apply_envelope(const struct mlnx_effect *mlnxeff, const s32 level)
+{
+ const struct ff_effect *effect = mlnxeff->effect;
+ const struct ff_envelope *envelope = mlnx_get_envelope(effect);
+ const unsigned long now = jiffies;
+ const s32 alevel = abs(level);
+
+ /* Effect has an envelope with nonzero attack time */
+ if (envelope->attack_length && time_before(now, mlnxeff->attack_stop)) {
+ const s32 into_trans_msecs = jiffies_to_msecs(now - mlnxeff->begin_at);
+ const s32 trans_length = envelope->attack_length;
+ const s32 dlevel = (alevel - envelope->attack_level) * into_trans_msecs / trans_length;
+ pr_debug("Effect is attacking\n");
+ pr_debug("Envelope orig: %d, dlevel: %d, into: %d, length: %d\n", level, dlevel, into_trans_msecs, trans_length);
+ return level < 0 ? -(dlevel + envelope->attack_level) : (dlevel + envelope->attack_level);
+ } else if (envelope->fade_length && time_before_eq(mlnxeff->fade_begin, now)) {
+ const s32 into_trans_msecs = jiffies_to_msecs(now - mlnxeff->fade_begin);
+ const s32 trans_length = envelope->fade_length;
+ const s32 dlevel = (envelope->fade_level - alevel) * into_trans_msecs / trans_length;
+ pr_debug("Effect is fading\n");
+ pr_debug("Envelope orig: %d, dlevel: %d, into: %d, length: %d\n", level, dlevel, into_trans_msecs, trans_length);
+ return level < 0 ? -(dlevel + alevel) : (dlevel + alevel);
+ }
+
+ return level;
+}
+
+static s32 mlnx_calculate_periodic(struct mlnx_effect *mlnxeff, const s32 level)
+{
+ const struct ff_effect *effect = mlnxeff->effect;
+ const unsigned long now = jiffies;
+ const u16 period = effect->u.periodic.period;
+ const unsigned long dt = jiffies_to_msecs(now - mlnxeff->updated_at);
+ s32 new = level;
+ unsigned long n_periods;
+ u16 t;
+
+ mlnxeff->playback_time += dt;
+ mlnxeff->playback_time &= 0x7fff; /* Make sure we don't exceed the max allowed period */
+ n_periods = mlnxeff->playback_time / period;
+ t = mlnxeff->playback_time - (n_periods * period);
+
+ switch (effect->u.periodic.waveform) {
+ case FF_SINE:
+ {
+ u16 degrees = (360 * t) / period;
+ new = ((level * fixp_sin(degrees)) >> FRAC_N) + effect->u.periodic.offset;
+ break;
+ }
+ case FF_SQUARE:
+ {
+ u16 degrees = (360 * t) / period;
+ new = level * (degrees < 180 ? 1 : -1);
+ break;
+ }
+ case FF_SAW_UP:
+ new = 2 * level * t / period - level + effect->u.periodic.offset;
+ break;
+ case FF_SAW_DOWN:
+ new = level - 2 * level * t / period + effect->u.periodic.offset;
+ break;
+ case FF_TRIANGLE:
+ {
+ /* Fixed-point implementation of A = 1 - 4 * ABS(0.5 - FRAC(0.5x + 0.25)) */
+ s32 a = abs(0x4000 - (((0x8000 * t / period) + 0x2000) & 0x7fff));
+ new = ((level * (0x8000 - 4 * a)) >> 15) + effect->u.periodic.offset;
+ break;
+ }
+ case FF_CUSTOM:
+ pr_debug("Custom waveform is not handled by this driver.\n");
+ return level;
+ default:
+ pr_debug("Invalid waveform.\n");
+ return level;
+ }
+
+ new = mlnx_clamp_level(new); /* Make sure that the offset did not make the value exceed the s16 range */
+ pr_debug("level: %d, playback: %u, t: %u, dt: %lu\n", new, mlnxeff->playback_time, t, dt);
+ return new;
+}
+
+static s32 mlnx_calculate_ramp(const struct mlnx_effect *mlnxeff)
+{
+ const struct ff_effect *effect = mlnxeff->effect;
+ const struct ff_envelope *envelope = mlnx_get_envelope(effect);
+ const unsigned long now = jiffies;
+ const u16 length = effect->replay.length;
+ s16 start = effect->u.ramp.start_level;
+ s16 end = effect->u.ramp.end_level;
+ u16 t = jiffies_to_msecs(now - mlnxeff->begin_at);
+ s32 new;
+
+ /* Effect has an envelope with nonzero attack time
+ * If the envelope is attacking, adjust "start", if the
+ * effect is fading, adjust "end". */
+ if (envelope->attack_length && time_before(now, mlnxeff->attack_stop)) {
+ const s32 into_trans_msecs = jiffies_to_msecs(now - mlnxeff->begin_at);
+ const s32 trans_length = envelope->attack_length;
+ const s32 dlevel = (abs(start) - envelope->attack_level) * into_trans_msecs / trans_length;
+ start = start < 0 ? -(dlevel + envelope->attack_level) : (dlevel + envelope->attack_level);
+ pr_debug("RA Envelope orig: %d, dlevel: %d, into: %d, length: %d\n", start, dlevel, into_trans_msecs, trans_length);
+ } else if (envelope->fade_length && time_before_eq(mlnxeff->fade_begin, now)) {
+ const s32 into_trans_msecs = jiffies_to_msecs(now - mlnxeff->fade_begin);
+ const s32 trans_length = envelope->fade_length;
+ const s32 dlevel = (envelope->fade_level - abs(end)) * into_trans_msecs / trans_length;
+ end = end < 0 ? -(dlevel + abs(end)) : (dlevel + abs(end));
+ pr_debug("RA Envelope orig: %d, dlevel: %d, into: %d, length: %d\n", end, dlevel, into_trans_msecs, trans_length);
+ }
+
+ new = ((end - start) * t) / (length) + start;
+ pr_debug("RAMP level: %d, t: %u\n", new, t);
+ return new;
+}
+
+static void mlnx_destroy(struct ff_device *dev)
+{
+ struct mlnx_device *mlnxdev = dev->private;
+ del_timer_sync(&mlnxdev->timer);
+
+ kfree(mlnxdev->private);
+}
+
+static unsigned long mlnx_get_envelope_update_time(const struct mlnx_effect *mlnxeff, const unsigned long update_rate_jiffies)
+{
+ const struct ff_effect *effect = mlnxeff->effect;
+ const struct ff_envelope *envelope = mlnx_get_envelope(effect);
+ const unsigned long now = jiffies;
+ unsigned long fade_next;
+
+ /* Effect has an envelope with nonzero attack time */
+ if (envelope->attack_length && time_before(now, mlnxeff->attack_stop)) {
+ pr_debug("Attack stop: %lu\n", mlnxeff->attack_stop);
+ if (time_before(mlnxeff->updated_at + update_rate_jiffies, mlnxeff->attack_stop))
+ return mlnxeff->updated_at + update_rate_jiffies;
+ else
+ return mlnxeff->attack_stop;
+ }
+
+ /* Effect has an envelope with nonzero fade time */
+ if (mlnxeff->effect->replay.length) {
+ if (envelope->fade_length) {
+
+ /* Schedule the next update when the fade begins */
+ if (time_before(mlnxeff->updated_at, mlnxeff->fade_begin))
+ return mlnxeff->fade_begin;
+
+ /* Already fading */
+ else if (time_before(mlnxeff->fade_begin, now)) {
+ fade_next = mlnxeff->updated_at + update_rate_jiffies;
+ if (time_after(fade_next, mlnxeff->stop_at))
+ return mlnxeff->stop_at; /* Schedule update when the effect stops */
+ else
+ return fade_next; /* Schedule update at the next checkpoint */
+ }
+ } else
+ return mlnxeff->stop_at;
+ }
+
+ /* There is no envelope */
+ if (mlnxeff->begin_at == now && test_bit(FF_EFFECT_PLAYING, &mlnxeff->flags))
+ return now - 1; /* Prevent the effect from being started twice */
+ else
+ return mlnxeff->begin_at;
+}
+
+static unsigned long mlnx_get_update_time(const struct mlnx_effect *mlnxeff, const unsigned long update_rate_jiffies)
+{
+ const unsigned long now = jiffies;
+ unsigned long time, update_periodic;
+
+ switch (mlnxeff->effect->type) {
+ /* Constant effect does not change with time, but it can have an envelope and a duration */
+ case FF_CONSTANT:
+ return mlnx_get_envelope_update_time(mlnxeff, update_rate_jiffies);
+ /* Periodic and ramp effects have to be periodically updated */
+ case FF_PERIODIC:
+ case FF_RAMP:
+ time = mlnx_get_envelope_update_time(mlnxeff, update_rate_jiffies);
+
+ if (mlnxeff->effect->type == FF_PERIODIC && mlnxeff->effect->u.periodic.waveform == FF_SQUARE)
+ update_periodic = msecs_to_jiffies(mlnxeff->effect->u.periodic.period / 2) + mlnxeff->updated_at;
+ else
+ update_periodic = mlnxeff->updated_at + update_rate_jiffies;
+
+ /* Periodic effect has to be updated earlier than envelope or envelope update time is in the past */
+ if (time_before(update_periodic, time) || time_before(time, now))
+ return update_periodic;
+ else /* Envelope needs to be updated */
+ return time;
+ case FF_DAMPER:
+ case FF_FRICTION:
+ case FF_INERTIA:
+ case FF_SPRING:
+ default:
+ if (time_after_eq(mlnxeff->begin_at, now))
+ return mlnxeff->begin_at;
+ else
+ return mlnxeff->stop_at;
+ }
+}
+
+static void mlnx_schedule_playback(struct mlnx_device *mlnxdev)
+{
+ struct mlnx_effect *mlnxeff;
+ const unsigned long now = jiffies;
+ int events = 0;
+ int i;
+ unsigned long earliest = 0;
+ unsigned long time;
+
+ /* Iterate over all effects and determine the earliest time when we have to attend to any */
+ for (i = 0; i < FF_MAX_EFFECTS; i++) {
+ mlnxeff = &mlnxdev->effects[i];
+
+ if (!test_bit(FF_EFFECT_STARTED, &mlnxeff->flags))
+ continue; /* Effect is not started, skip it */
+
+ if (test_bit(FF_EFFECT_PLAYING, &mlnxeff->flags))
+ time = mlnx_get_update_time(mlnxeff, mlnxdev->update_rate_jiffies);
+ else
+ time = mlnxeff->begin_at;
+
+ pr_debug("Update time for effect %d: %lu\n", i, time);
+
+ /* Scheduled time is in the future and is either before the current earliest time
+ * or it is the first valid time value in this pass */
+ if (time_before_eq(now, time) && (++events == 1 || time_before(time, earliest)))
+ earliest = time;
+ }
+
+ if (events) {
+ pr_debug("Events: %d, earliest: %lu\n", events, earliest);
+ mod_timer(&mlnxdev->timer, earliest);
+ }
+}
+
+static void mlnx_add_force(struct mlnx_effect *mlnxeff, s32 *cfx, s32 *cfy, const u16 gain)
+{
+ u16 direction;
+ s32 level;
+
+ pr_debug("Processing effect type %d, ID %d\n", mlnxeff->effect->type, mlnxeff->effect->id);
+
+ direction = mlnxeff->effect->direction * 360 / 0xffff;
+ pr_debug("Direction deg: %u\n", direction);
+
+ switch (mlnxeff->effect->type) {
+ case FF_CONSTANT:
+ level = mlnx_apply_envelope(mlnxeff, mlnxeff->effect->u.constant.level);
+ break;
+ case FF_PERIODIC:
+ level = mlnx_apply_envelope(mlnxeff, mlnxeff->effect->u.periodic.magnitude);
+ level = mlnx_calculate_periodic(mlnxeff, level);
+ break;
+ case FF_RAMP:
+ level = mlnx_calculate_ramp(mlnxeff);
+ break;
+ default:
+ pr_debug("Effect %d is not handled by mlnx_add_force, this is probably a bug!\n", mlnxeff->effect->type);
+ return;
+ }
+
+ *cfx += mlnx_calculate_x_force(level, direction) * gain / 0xffff;
+ *cfy += mlnx_calculate_y_force(level, direction) * gain / 0xffff;
+}
+
+static void mlnx_play_effects(struct mlnx_device *mlnxdev)
+{
+ const u16 gain = mlnxdev->gain;
+ const unsigned long now = jiffies;
+ int i;
+ int cfx = 0;
+ int cfy = 0;
+
+ for (i = 0; i < FF_MAX_EFFECTS; i++) {
+ struct mlnx_effect *mlnxeff = &mlnxdev->effects[i];
+
+ if (!test_bit(FF_EFFECT_STARTED, &mlnxeff->flags)) {
+ pr_debug("Effect %hd/%d not started\n", mlnxeff->effect->id, i);
+ continue;
+ }
+
+ if (time_before(now, mlnxeff->begin_at)) {
+ pr_debug("Effect %hd/%d begins at a later time\n", mlnxeff->effect->id, i);
+ continue;
+ }
+
+ if (time_before_eq(mlnxeff->stop_at, now) && mlnxeff->effect->replay.length) {
+ pr_debug("Effect %hd/%d has to be stopped\n", mlnxeff->effect->id, i);
+
+ /* If the effect should be repeated, reset it */
+ if (--mlnxeff->repeat > 0) {
+ __clear_bit(FF_EFFECT_PLAYING, &mlnxeff->flags);
+ mlnxeff->begin_at = mlnxeff->stop_at + msecs_to_jiffies(mlnxeff->effect->replay.delay);
+ mlnxeff->stop_at = mlnxeff->begin_at + msecs_to_jiffies(mlnxeff->effect->replay.length);
+ } else /* The effect has to be stopped */
+ mlnx_stop_effect(mlnxdev, mlnxeff, i);
+
+ continue;
+ }
+
+ switch (mlnxeff->effect->type) {
+ case FF_CONSTANT:
+ case FF_PERIODIC:
+ case FF_RAMP:
+ if (!test_and_set_bit(FF_EFFECT_PLAYING, &mlnxeff->flags)) {
+ mlnxdev->combinable_playing++;
+ pr_debug("Starting combinable effect, total %u\n", mlnxdev->combinable_playing);
+ }
+ mlnx_add_force(mlnxeff, &cfx, &cfy, gain);
+ break;
+ case FF_DAMPER:
+ case FF_FRICTION:
+ case FF_INERTIA:
+ case FF_SPRING:
+ if (!test_and_set_bit(FF_EFFECT_PLAYING, &mlnxeff->flags)) {
+ const struct mlnx_effect_command ecmd = { .cmd = MLNX_START_UNCOMB,
+ .u.uncomb.id = i,
+ .u.uncomb.effect = mlnxeff->effect };
+ mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private, &ecmd);
+ }
+ break;
+ default:
+ pr_debug("Unhandled type of effect.\n");
+ }
+ mlnxeff->updated_at = now;
+ }
+
+ if (mlnxdev->combinable_playing) {
+ const struct mlnx_effect_command ecmd = { .cmd = MLNX_START_COMBINED,
+ .u.simple_force = { .x = mlnx_clamp_level(cfx), .y = mlnx_clamp_level(cfy) } };
+ mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private, &ecmd);
+ }
+
+ mlnx_schedule_playback(mlnxdev);
+}
+
+static void mlnx_set_gain(struct input_dev *dev, u16 gain)
+{
+ struct mlnx_device *mlnxdev = dev->ff->private;
+ int i;
+
+ mlnxdev->gain = gain;
+
+ for (i = 0; i < FF_MAX_EFFECTS; i++)
+ __clear_bit(FF_EFFECT_PLAYING, &mlnxdev->effects[i].flags);
+
+ mlnx_play_effects(mlnxdev);
+}
+
+static int mlnx_startstop(struct input_dev *dev, int effect_id, int repeat)
+{
+ struct mlnx_device *mlnxdev = dev->ff->private;
+ struct mlnx_effect *mlnxeff = &mlnxdev->effects[effect_id];
+
+ if (repeat > 0) {
+ pr_debug("Starting effect ID %d\n", effect_id);
+ mlnxeff->repeat = repeat;
+ mlnx_start_effect(mlnxdev, mlnxeff);
+ } else {
+ pr_debug("Stopping effect ID %d\n", effect_id);
+ if (test_bit(FF_EFFECT_STARTED, &mlnxdev->effects[effect_id].flags)) {
+ if (test_bit(FF_EFFECT_PLAYING, &mlnxdev->effects[effect_id].flags)) {
+ mlnx_stop_effect(mlnxdev, mlnxeff, effect_id);
+ __clear_bit(FF_EFFECT_PLAYING, &mlnxdev->effects[effect_id].flags);
+ }
+ __clear_bit(FF_EFFECT_STARTED, &mlnxdev->effects[effect_id].flags);
+ } else
+ pr_debug("Effect ID %d already stopped.\n", effect_id);
+ }
+
+ mlnx_play_effects(mlnxdev);
+
+ return 0;
+}
+
+static void mlnx_timer_fired(unsigned long data)
+{
+ struct input_dev *dev = (struct input_dev *)data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->event_lock, flags);
+ mlnx_play_effects(dev->ff->private);
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+}
+
+static int mlnx_upload(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old)
+{
+ struct mlnx_device *mlnxdev = dev->ff->private;
+ struct mlnx_effect *mlnxeff = &mlnxdev->effects[effect->id];
+ const unsigned long now = jiffies;
+ int ret, fade_from;
+
+ pr_debug("Uploading effect type %d, ID %d\n", effect->type, effect->id);
+
+ if (effect->type == FF_PERIODIC) {
+ if (!effect->u.periodic.period)
+ return -EINVAL;
+ }
+
+ if (effect->type == FF_CONSTANT || effect->type == FF_PERIODIC || effect->type == FF_RAMP) {
+ const struct ff_envelope *envelope = mlnx_get_envelope(effect);
+
+ /* Infinite effects cannot fade */
+ if (effect->replay.length == 0 && envelope->fade_length > 0)
+ return -EINVAL;
+ /* Fade length cannot be greater than effect duration */
+ fade_from = (int)effect->replay.length - (int)envelope->fade_length;
+ if (fade_from < 0)
+ return -EINVAL;
+ /* Envelope cannot start fading before it finishes attacking */
+ if (fade_from < envelope->attack_length)
+ return -EINVAL;
+ }
+
+ spin_lock_irq(&dev->event_lock);
+ /* Check if the effect being modified is playing */
+ if (test_bit(FF_EFFECT_STARTED, &mlnxeff->flags)) {
+ /* Set the effect to stopped state */
+ __clear_bit(FF_EFFECT_STARTED, &mlnxeff->flags);
+ mlnx_set_trip_times(mlnxeff, now);
+ mlnx_set_envelope_times(mlnxeff);
+ mlnx_schedule_playback(mlnxdev);
+ }
+
+ /* Some devices might have a limit on how many uncombinable effect can be played at once */
+ if (mlnx_is_conditional(effect)) {
+ struct mlnx_effect_command ecmd = { .cmd = MLNX_CAN_PLAY,
+ .u.uncomb.id = effect->id,
+ .u.uncomb.effect = effect };
+ ret = mlnxdev->control_effect(dev, mlnxdev->private, &ecmd);
+ if (ret) {
+ pr_debug("Device rejected effect\n");
+ spin_unlock_irq(&dev->event_lock);
+ return ret;
+ }
+ }
+
+ spin_unlock_irq(&dev->event_lock);
+
+ return 0;
+}
+
+int input_ff_create_mlnx(struct input_dev *dev, void *data, int(*control_effect)(struct input_dev *, void *, const struct mlnx_effect_command *),
+ const u16 update_rate)
+{
+ struct mlnx_device *mlnxdev;
+ int ret;
+ int i;
+
+ if (update_rate < FF_MIN_UPDATE_RATE_MSECS)
+ return -EINVAL;
+
+ mlnxdev = kzalloc(sizeof(struct mlnx_device), GFP_KERNEL);
+ if (!mlnxdev)
+ return -ENOMEM;
+
+ mlnxdev->dev = dev;
+ mlnxdev->private = data;
+ mlnxdev->control_effect = control_effect;
+ mlnxdev->gain = 0xffff;
+ mlnxdev->update_rate_jiffies = msecs_to_jiffies(update_rate);
+ setup_timer(&mlnxdev->timer, mlnx_timer_fired, (unsigned long)dev);
+
+ ret = input_ff_create(dev, FF_MAX_EFFECTS);
+ if (ret) {
+ kfree(mlnxdev);
+ return ret;
+ }
+
+ dev->ff->private = mlnxdev;
+ dev->ff->upload = mlnx_upload;
+ dev->ff->set_gain = mlnx_set_gain;
+ dev->ff->destroy = mlnx_destroy;
+ dev->ff->playback = mlnx_startstop;
+
+ /* Link mlnxdev->effects to dev->ff->effects */
+ for (i = 0; i < FF_MAX_EFFECTS; i++)
+ mlnxdev->effects[i].effect = &dev->ff->effects[i];
+
+ pr_debug("MLNX: Device successfully registered.\n");
+ return 0;
+}
+EXPORT_SYMBOL_GPL(input_ff_create_mlnx);
diff --git a/include/linux/input/ff-memless-next.h b/include/linux/input/ff-memless-next.h
new file mode 100644
index 0000000..0711c1c
--- /dev/null
+++ b/include/linux/input/ff-memless-next.h
@@ -0,0 +1,29 @@
+#include <linux/input.h>
+
+enum mlnx_commands {
+ MLNX_START_COMBINED,
+ MLNX_STOP_COMBINED,
+ MLNX_START_UNCOMB,
+ MLNX_STOP_UNCOMB,
+ MLNX_CAN_PLAY
+};
+
+struct mlnx_simple_force {
+ const s32 x;
+ const s32 y;
+};
+
+struct mlnx_uncomb_effect {
+ const int id;
+ const struct ff_effect *effect;
+};
+
+struct mlnx_effect_command {
+ const enum mlnx_commands cmd;
+ union {
+ const struct mlnx_simple_force simple_force;
+ const struct mlnx_uncomb_effect uncomb;
+ } u;
+};
+
+int input_ff_create_mlnx(struct input_dev *dev, void *data, int(*control_effect)(struct input_dev *, void *, const struct mlnx_effect_command *), const u16 update_rate);
--
1.8.5.1


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