[PATCH v2 00/24] input: Introduce ff-memless-next as an improved replacement for ff-memless

[PATCH v2 00/24] input: Introduce ff-memless-next as an improved replacement for ff-memless

[Michal Malý]

ff-memless-next (MLNX) is a largely improved version of the current ff-memless
(FFML) driver. MLNX supports all force feedback effects currently available in
the Linux force feedback userspace API. All effects are handled in accordance
with Microsoft's DirectInput/XInput. Most notable changes include support for
conditional effects, proper handling of all periodic waveforms and improved
emulation of rumble effects through periodic effects. MLNX also uses its own
kernel API to pass processed effects to hardware-specific drivers instead of
abusing "ff_effect" struct. The API is documented in the respective header
file.

MLNX has been expanded to be a direct replacement for FFML.

Support for FF_PERIODIC and FF_RAMP has been added to all devices that
support FF_CONSTANT as a part of the port to the new API.

This patch series:
1) Adds "ff-memless-next" module [1]
2) Ports all hardware-specific drivers to MLNX's API [2-23]
3) Removes FFML and replaces it with MLNX [24]

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>

v2:
 - Add missing msecs to jiffies conversion in ff-memless-next
 - lgff: Properly convert force on Y axis from MLNX to device range
         Support periodic effects for "joystick_ac" device class
 - lg3ff: Properly convert forces from MLNX to device range
 - Very minor coding style issues fixed

Michal Malý (24):
  Add ff-memless-next module
  Port arizona-haptics to ff-memless-next
  Port twl4030-vibra to ff-memless-next
  Port twl6040-vibra to ff-memless-next
  Port max8997_haptic to ff-memless-next
  Port pm8xxx-vibrator to ff-memless-next
  Port hid-axff to ff-memless-next
  Port hid-emsff to ff-memless-next
  Port hid-dr to ff-memless-next
  Port hid-gaff to ff-memless-next
  Port hid-holtekff to ff-memless-next
  Port hid-lgff to ff-memless-next
  Port hid-lg3ff to ff-memless-next
  Port hid-pl to ff-memless-next
  Port hid-sjoy to ff-memless-next
  Port hid-sony to ff-memless-next
  Port hid-tmff to ff-memless-next
  Port hid-wiimote-modules to ff-memless-next
  Port hid-zpff to ff-memless-next
  Port gamecon to ff-memless-next
  Port xpad to ff-memless-next
  - Port hid-lg2ff to ff-memless-next     - Clamp vibration magnitude to
    range <0x02; 0xfd> to prevent irregular       shaking of the
    vibration motors.
  Port hid-lg4ff to ff-memless-next
  Replace ff-memless with ff-memless-next

 drivers/hid/Kconfig                   |   30 +-
 drivers/hid/hid-axff.c                |   32 +-
 drivers/hid/hid-dr.c                  |   59 +-
 drivers/hid/hid-emsff.c               |   38 +-
 drivers/hid/hid-gaff.c                |   32 +-
 drivers/hid/hid-holtekff.c            |   47 +-
 drivers/hid/hid-lg2ff.c               |   65 ++-
 drivers/hid/hid-lg3ff.c               |   60 +-
 drivers/hid/hid-lg4ff.c               |   93 +--
 drivers/hid/hid-lgff.c                |   70 ++-
 drivers/hid/hid-pl.c                  |   38 +-
 drivers/hid/hid-sjoy.c                |   35 +-
 drivers/hid/hid-sony.c                |   24 +-
 drivers/hid/hid-tmff.c                |   83 +--
 drivers/hid/hid-wiimote-modules.c     |   74 ++-
 drivers/hid/hid-zpff.c                |   30 +-
 drivers/input/Kconfig                 |    4 +-
 drivers/input/Makefile                |    2 +-
 drivers/input/ff-memless-next.c       | 1037 +++++++++++++++++++++++++++++++++
 drivers/input/ff-memless.c            |  547 -----------------
 drivers/input/joystick/Kconfig        |    4 +-
 drivers/input/joystick/gamecon.c      |   57 +-
 drivers/input/joystick/xpad.c         |  125 ++--
 drivers/input/misc/Kconfig            |   10 +-
 drivers/input/misc/arizona-haptics.c  |   39 +-
 drivers/input/misc/max8997_haptic.c   |   25 +-
 drivers/input/misc/pm8xxx-vibrator.c  |   28 +-
 drivers/input/misc/twl4030-vibra.c    |   31 +-
 drivers/input/misc/twl6040-vibra.c    |   27 +-
 include/linux/input.h                 |    3 -
 include/linux/input/ff-memless-next.h |  149 +++++
 31 files changed, 1939 insertions(+), 959 deletions(-)
 create mode 100644 drivers/input/ff-memless-next.c
 delete mode 100644 drivers/input/ff-memless.c
 create mode 100644 include/linux/input/ff-memless-next.h

-- 
1.9.2

[PATCH v2 01/24] input: Add ff-memless-next module

[Michal Malý]

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
Tested-by: Elias Vanderstuyft <elias.vds@gmail.com>
---
 drivers/input/Kconfig                 |   11 +
 drivers/input/Makefile                |    1 +
 drivers/input/ff-memless-next.c       | 1037 +++++++++++++++++++++++++++++++++
 include/linux/input/ff-memless-next.h |  149 +++++
 4 files changed, 1198 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..3780962 100644
--- a/drivers/input/Kconfig
+++ b/drivers/input/Kconfig
@@ -38,6 +38,17 @@ config INPUT_FF_MEMLESS
 	  To compile this driver as a module, choose M here: the
 	  module will be called ff-memless.
 
+config INPUT_FF_MEMLESS_NEXT
+	tristate "New version of support for memoryless force-feedback devices"
+	help
+	  Say Y here to enable a new version of support for memoryless force
+	  feedback devices.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ff-memless-next.
+
 config INPUT_POLLDEV
 	tristate "Polled input device skeleton"
 	help
diff --git a/drivers/input/Makefile b/drivers/input/Makefile
index 5ca3f63..b4f11f5 100644
--- a/drivers/input/Makefile
+++ b/drivers/input/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_INPUT)		+= input-core.o
 input-core-y := input.o input-compat.o input-mt.o ff-core.o
 
 obj-$(CONFIG_INPUT_FF_MEMLESS)	+= ff-memless.o
+obj-$(CONFIG_INPUT_FF_MEMLESS_NEXT)	+= ff-memless-next.o
 obj-$(CONFIG_INPUT_POLLDEV)	+= input-polldev.o
 obj-$(CONFIG_INPUT_SPARSEKMAP)	+= sparse-keymap.o
 obj-$(CONFIG_INPUT_MATRIXKMAP)	+= matrix-keymap.o
diff --git a/drivers/input/ff-memless-next.c b/drivers/input/ff-memless-next.c
new file mode 100644
index 0000000..24619e9
--- /dev/null
+++ b/drivers/input/ff-memless-next.c
@@ -0,0 +1,1037 @@
+/*
+ * Force feedback support for memoryless devices
+ *
+ * This module is based on "ff-memless" orignally written by Anssi Hannula.
+ * It is extended to support all force feedback effects currently supported
+ * by the Linux input stack.
+ * Logic of emulation of FF_RUMBLE through FF_PERIODIC provided by
+ * Elias Vanderstuyft <elias.vds@gmail.com>
+ *
+ * Copyright(c) 2014 Michal "MadCatX" Maly <madcatxster@devoid-pointer.net>
+ *
+ */
+
+#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_EFFECT_LENGTH ((MSEC_PER_SEC / CONFIG_HZ) + 1)
+#define FF_EFFECT_STARTED 1
+#define FF_EFFECT_PLAYING 2
+#define FF_EFFECT_EMULATED 3
+
+enum mlnx_emulate {
+	EMUL_NOTHING,	/* Do not emulate anything */
+	EMUL_RUMBLE,	/* Emulate FF_RUMBLE with FF_PERIODIC */
+	EMUL_PERIODIC	/* Emulate FF_PERIODIC with FF_RUMBLE */
+};
+
+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;
+};
+
+struct mlnx_device {
+	u8 combinable_playing;
+	u8 rumble_playing;
+	unsigned long update_rate_jiffies;
+	void *private;
+	struct mlnx_effect effects[FF_MAX_EFFECTS];
+	u16 gain;
+	struct timer_list timer;
+	struct input_dev *dev;
+	enum mlnx_emulate emul;
+
+	int (*control_effect)(struct input_dev *, void *,
+			      const struct mlnx_effect_command *);
+};
+
+static 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 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 bool mlnx_is_combinable(const struct ff_effect *effect)
+{
+	switch (effect->type) {
+	case FF_CONSTANT:
+	case FF_PERIODIC:
+	case FF_RAMP:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool mlnx_is_conditional(const struct ff_effect *effect)
+{
+	switch (effect->type) {
+	case FF_DAMPER:
+	case FF_FRICTION:
+	case FF_INERTIA:
+	case FF_SPRING:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static void mlnx_clr_emulated(struct mlnx_effect *mlnxeff)
+{
+	__clear_bit(FF_EFFECT_EMULATED, &mlnxeff->flags);
+}
+
+static void mlnx_clr_playing(struct mlnx_effect *mlnxeff)
+{
+	__clear_bit(FF_EFFECT_PLAYING, &mlnxeff->flags);
+}
+
+static void mlnx_clr_started(struct mlnx_effect *mlnxeff)
+{
+	__clear_bit(FF_EFFECT_STARTED, &mlnxeff->flags);
+}
+
+static bool mlnx_is_emulated(const struct mlnx_effect *mlnxeff)
+{
+	return test_bit(FF_EFFECT_EMULATED, &mlnxeff->flags);
+}
+
+static bool mlnx_is_rumble(const struct ff_effect *effect)
+{
+	return effect->type == FF_RUMBLE;
+}
+
+static bool mlnx_is_playing(const struct mlnx_effect *mlnxeff)
+{
+	return test_bit(FF_EFFECT_PLAYING, &mlnxeff->flags);
+}
+
+static bool mlnx_is_started(const struct mlnx_effect *mlnxeff)
+{
+	return test_bit(FF_EFFECT_STARTED, &mlnxeff->flags);
+}
+
+static bool mlnx_test_set_playing(struct mlnx_effect *mlnxeff)
+{
+	return test_and_set_bit(FF_EFFECT_PLAYING, &mlnxeff->flags);
+}
+
+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;
+	}
+}
+
+/* Some devices might have a limit on how many uncombinable effects
+ * can be played at once */
+static int mlnx_upload_conditional(struct mlnx_device *mlnxdev,
+				   const struct ff_effect *effect)
+{
+	struct mlnx_effect_command ecmd = {
+		.cmd = MLNX_UPLOAD_UNCOMB,
+		.u.uncomb.id = effect->id,
+		.u.uncomb.effect = effect
+	};
+	return mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private, &ecmd);
+}
+
+static int mlnx_erase_conditional(struct mlnx_device *mlnxdev,
+				  const struct ff_effect *effect)
+{
+	struct mlnx_effect_command ecmd = {
+		.cmd = MLNX_ERASE_UNCOMB,
+		.u.uncomb.id = effect->id,
+		.u.uncomb.effect = effect
+	};
+	return mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private, &ecmd);
+}
+
+static void mlnx_set_envelope_times(struct mlnx_effect *mlnxeff)
+{
+	const struct ff_effect *effect = &mlnxeff->effect;
+	const struct ff_envelope *envelope = mlnx_get_envelope(effect);
+
+	if (envelope->attack_length) {
+		unsigned long j = msecs_to_jiffies(envelope->attack_length);
+		mlnxeff->attack_stop = mlnxeff->begin_at + j;
+	}
+	if (effect->replay.length && envelope->fade_length) {
+		unsigned long j = msecs_to_jiffies(envelope->fade_length);
+		mlnxeff->fade_begin = mlnxeff->stop_at - j;
+	}
+}
+
+static void mlnx_set_trip_times(struct mlnx_effect *mlnxeff,
+				const unsigned long now)
+{
+	const struct ff_effect *effect = &mlnxeff->effect;
+	const u16 replay_delay = effect->replay.delay;
+	const u16 replay_length = effect->replay.length;
+
+	mlnxeff->begin_at = now + msecs_to_jiffies(replay_delay);
+	mlnxeff->stop_at = mlnxeff->begin_at + msecs_to_jiffies(replay_length);
+	mlnxeff->updated_at = mlnxeff->begin_at;
+}
+
+static void mlnx_start_effect(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,
+			     const struct mlnx_effect *mlnxeff)
+{
+	switch (mlnxeff->effect.type) {
+	case FF_PERIODIC:
+		if (mlnx_is_emulated(mlnxeff)) {
+			if (--mlnxdev->rumble_playing == 0) {
+				const struct mlnx_effect_command c = {
+					.cmd = MLNX_STOP_RUMBLE
+				};
+				mlnxdev->control_effect(mlnxdev->dev,
+							mlnxdev->private, &c);
+			}
+			return;
+		}
+	case FF_CONSTANT:
+	case FF_RAMP:
+		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_RUMBLE:
+		if (mlnx_is_emulated(mlnxeff)) {
+			if (--mlnxdev->combinable_playing == 0) {
+				const struct mlnx_effect_command c = {
+					.cmd = MLNX_STOP_COMBINED
+				};
+				mlnxdev->control_effect(mlnxdev->dev,
+							mlnxdev->private, &c);
+			}
+		} else {
+			if (--mlnxdev->rumble_playing == 0) {
+				const struct mlnx_effect_command c = {
+					.cmd = MLNX_STOP_RUMBLE
+				};
+				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 = mlnxeff->effect.id,
+			.u.uncomb.effect = &mlnxeff->effect
+		};
+		mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private, &c);
+		return;
+	}
+	default:
+		return;
+	}
+}
+
+static int mlnx_restart_effect(struct mlnx_device *mlnxdev,
+			       struct mlnx_effect *mlnxeff)
+{
+	const struct ff_effect *effect = &mlnxeff->effect;
+	const unsigned long now = jiffies;
+
+	if (mlnx_is_combinable(effect)) {
+		if (effect->replay.delay)
+			mlnx_stop_effect(mlnxdev, mlnxeff);
+		else {
+			if (mlnx_is_emulated(mlnxeff))
+				mlnxdev->rumble_playing--;
+			else
+				mlnxdev->combinable_playing--;
+		}
+	} else if (mlnx_is_rumble(effect)) {
+		if (effect->replay.delay)
+			mlnx_stop_effect(mlnxdev, mlnxeff);
+		else {
+			if (mlnx_is_emulated(mlnxeff))
+				mlnxdev->combinable_playing--;
+			else
+				mlnxdev->rumble_playing--;
+		}
+	} else if (mlnx_is_conditional(effect)) {
+		int ret;
+		if (effect->replay.delay)
+			mlnx_stop_effect(mlnxdev, mlnxeff);
+
+		ret = mlnx_upload_conditional(mlnxdev, &mlnxeff->effect);
+		if (ret)
+			return ret;
+	}
+
+	mlnx_set_trip_times(mlnxeff, now);
+	mlnx_set_envelope_times(mlnxeff);
+
+	return 0;
+}
+
+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 clength = jiffies_to_msecs(now - mlnxeff->begin_at);
+		const s32 alength = envelope->attack_length;
+		const s32 dlevel = (alevel - envelope->attack_level)
+				 * clength / alength;
+		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 clength = jiffies_to_msecs(now - mlnxeff->fade_begin);
+		const s32 flength = envelope->fade_length;
+		const s32 dlevel = (envelope->fade_level - alevel)
+				 * clength / flength;
+		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 u16 phase = effect->u.periodic.phase;
+	const s16 offset = effect->u.periodic.offset;
+	s32 new = level;
+	u16 t = (jiffies_to_msecs(now - mlnxeff->begin_at) + phase) % period;
+
+	switch (effect->u.periodic.waveform) {
+	case FF_SINE:
+	{
+		u16 degrees = (360 * t) / period;
+		new = ((level * fixp_sin(degrees)) >> FRAC_N) + offset;
+		break;
+	}
+	case FF_SQUARE:
+	{
+		u16 degrees = (360 * t) / period;
+		new = level * (degrees < 180 ? 1 : -1) + offset;
+		break;
+	}
+	case FF_SAW_UP:
+		new = 2 * level * t / period - level + offset;
+		break;
+	case FF_SAW_DOWN:
+		new = level - 2 * level * t / period + offset;
+		break;
+	case FF_TRIANGLE:
+	{
+		new = (2 * abs(level - (2 * level * t) / period));
+		new = new - abs(level) + offset;
+		break;
+	}
+	case FF_CUSTOM:
+		pr_debug("Custom waveform is not handled by this driver\n");
+		return level;
+	default:
+		pr_err("Invalid waveform\n");
+		return level;
+	}
+
+	/* Ensure that the offset did not make the value exceed s16 range */
+	new = clamp(new, -0x7fff, 0x7fff);
+	pr_debug("level: %d, t: %u\n", new, t);
+	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;
+	const s16 mean = (effect->u.ramp.start_level + effect->u.ramp.end_level) / 2;
+	const u16 t = jiffies_to_msecs(now - mlnxeff->begin_at);
+	s32 start = effect->u.ramp.start_level;
+	s32 end = effect->u.ramp.end_level;
+	s32 new;
+
+	if (envelope->attack_length && time_before(now, mlnxeff->attack_stop)) {
+		const s32 clength = jiffies_to_msecs(now - mlnxeff->begin_at);
+		const s32 alength = envelope->attack_length;
+		s32 attack_level;
+		if (end > start)
+			attack_level = mean - envelope->attack_level;
+		else
+			attack_level = mean + envelope->attack_level;
+		start = (start - attack_level) * clength / alength
+		      + attack_level;
+	} else if (envelope->fade_length && time_before_eq(mlnxeff->fade_begin, now)) {
+		const s32 clength = jiffies_to_msecs(now - mlnxeff->fade_begin);
+		const s32 flength = envelope->fade_length;
+		s32 fade_level;
+		if (end > start)
+			fade_level = mean + envelope->fade_level;
+		else
+			fade_level = mean - envelope->fade_level;
+		end = (fade_level - end) * clength / flength + end;
+	}
+
+	new = ((end - start) * t) / length + start;
+	new = clamp(new, -0x7fff, 0x7fff);
+	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)) {
+		if (time_before(mlnxeff->updated_at + update_rate_jiffies, mlnxeff->attack_stop))
+			return mlnxeff->updated_at + update_rate_jiffies;
+
+		return mlnxeff->attack_stop;
+	}
+
+	/* Effect has an envelope with nonzero fade time */
+	if (mlnxeff->effect.replay.length) {
+		if (!envelope->fade_length)
+			return mlnxeff->stop_at;
+
+		/* Schedule the next update when the fade begins */
+		if (time_before(mlnxeff->updated_at, mlnxeff->fade_begin))
+			return mlnxeff->fade_begin;
+
+		/* Already fading */
+		fade_next = mlnxeff->updated_at + update_rate_jiffies;
+
+		/* Schedule update when the effect stops */
+		if (time_after(fade_next, mlnxeff->stop_at))
+			return mlnxeff->stop_at;
+		/* Schedule update at the next checkpoint */
+			return fade_next;
+	}
+
+	/* There is no envelope */
+
+	/* Prevent the effect from being started twice */
+	if (mlnxeff->begin_at == now && mlnx_is_playing(mlnxeff))
+		return now - 1;
+
+	return mlnxeff->begin_at;
+}
+
+static unsigned long mlnx_get_update_time(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 (mlnx_is_emulated(mlnxeff))
+			update_periodic = mlnxeff->stop_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;
+		/* Envelope needs to be updated */
+		return time;
+	case FF_RUMBLE:
+		if (mlnx_is_emulated(mlnxeff))
+			return mlnxeff->updated_at + update_rate_jiffies;
+	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;
+
+		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 (!mlnx_is_started(mlnxeff))
+			continue; /* Effect is not started, skip it */
+
+		if (mlnx_is_playing(mlnxeff))
+			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);
+	} else {
+		pr_debug("No events, deactivating timer\n");
+		del_timer(&mlnxdev->timer);
+	}
+}
+
+static u16 mlnx_calculate_rumble_direction(const u32 total_mag, const u16 total_dir,
+					   const u32 new_mag, const u16 new_dir)
+{
+	if (!new_mag)
+		return total_dir;
+	if (!total_mag)
+		return new_dir;
+	return (((total_dir >> 1) * total_mag +
+		(new_dir >> 1) * new_mag) /
+		(total_mag + new_mag)) << 1;
+}
+
+static void mlnx_add_force(struct mlnx_effect *mlnxeff, s32 *cfx, s32 *cfy,
+			   const u16 gain)
+{
+	const struct ff_effect *effect = &mlnxeff->effect;
+	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, effect->u.constant.level);
+		break;
+	case FF_PERIODIC:
+		level = mlnx_apply_envelope(mlnxeff,
+					    effect->u.periodic.magnitude);
+		level = mlnx_calculate_periodic(mlnxeff, level);
+		break;
+	case FF_RAMP:
+		level = mlnx_calculate_ramp(mlnxeff);
+		break;
+	default:
+		pr_err("Effect %d not handled by mlnx_add_force\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_add_rumble(const struct mlnx_effect *mlnxeff, u32 *strong_mag,
+			    u32 *weak_mag, u16 *strong_dir,
+			    u16 *weak_dir, const u16 gain)
+{
+	const struct ff_effect *eff = &mlnxeff->effect;
+	const struct ff_rumble_effect *reff = &mlnxeff->effect.u.rumble;
+	const u32 new_strong_mag = (u32)reff->strong_magnitude * gain / 0xffffU;
+	const u32 new_weak_mag = (u32)reff->weak_magnitude * gain / 0xffffU;
+
+	*strong_dir = mlnx_calculate_rumble_direction(*strong_mag, *strong_dir,
+						      new_strong_mag,
+						      eff->direction);
+	*weak_dir = mlnx_calculate_rumble_direction(*weak_mag, *weak_dir,
+						    new_weak_mag,
+						    eff->direction);
+	*strong_mag += new_strong_mag;
+	*weak_mag += new_weak_mag;
+}
+
+static void mlnx_add_emul_periodic(const struct mlnx_effect *mlnxeff,
+				   u32 *strong_mag, u32 *weak_mag,
+				   u16 *strong_dir, u16 *weak_dir,
+				   const u16 gain)
+{
+	const struct ff_effect *eff = &mlnxeff->effect;
+	const u32 level = (u32)abs(mlnx_apply_envelope(mlnxeff,
+						  eff->u.periodic.magnitude)) * gain / 0x7fffU;
+
+	*strong_dir = mlnx_calculate_rumble_direction(*strong_mag, *strong_dir,
+						      level, eff->direction);
+	*weak_dir = mlnx_calculate_rumble_direction(*weak_mag, *weak_dir,
+						    level, eff->direction);
+
+	*strong_mag += level;
+	*weak_mag += level;
+}
+
+static void mlnx_add_emul_rumble(const struct mlnx_effect *mlnxeff, s32 *cfx,
+				 s32 *cfy, const u16 gain,
+				 const unsigned long now,
+				 const unsigned long update_rate_jiffies)
+{
+	const struct ff_effect *effect = &mlnxeff->effect;
+	const u16 strong = effect->u.rumble.strong_magnitude;
+	const u16 weak = effect->u.rumble.weak_magnitude;
+	/* To calculate 't', we pretend that mlnxeff->begin_at == 0, thus t == now.  */
+	/* This will synchronise all simultaneously playing emul rumble effects,     */
+	/* otherwise non-deterministic phase-inversions could occur depending on     */
+	/* upload time, which could lead to undesired cancellation of these effects. */
+	const unsigned long t = now % (4UL * update_rate_jiffies);
+	s32 level = 0;
+	bool direction_up;
+	bool direction_left;
+
+	if (strong)
+		level += (strong / 4) * (t < 2UL * update_rate_jiffies ? 1 : -1);
+	if (weak)
+		level += (weak / 4) * (t < 2UL * update_rate_jiffies ?
+					(t < 1UL * update_rate_jiffies ? 1 : -1) :
+					(t < 3UL * update_rate_jiffies ? 1 : -1));
+	direction_up = (effect->direction > 0x3fffU && effect->direction <= 0xbfffU);
+	direction_left = (effect->direction <= 0x7fffU);
+
+	pr_debug("Emulated cf: %d, t: %lu, n: %lu, begin: %lu, diff: %lu j: %lu\n",
+		 level, t, now, mlnxeff->begin_at, now - mlnxeff->begin_at,
+		 update_rate_jiffies);
+	level = (level * gain) / 0xffff;
+	*cfx += direction_left ? -level : level;
+	*cfy += direction_up ? -level : level;
+}
+
+static void mlnx_play_effects(struct mlnx_device *mlnxdev)
+{
+	const u16 gain = mlnxdev->gain;
+	const unsigned long now = jiffies;
+	int i;
+	s32 cfx = 0;
+	s32 cfy = 0;
+	u32 strong_mag = 0;
+	u32 weak_mag = 0;
+	u16 strong_dir = 0;
+	u16 weak_dir = 0;
+
+	for (i = 0; i < FF_MAX_EFFECTS; i++) {
+		struct mlnx_effect *mlnxeff = &mlnxdev->effects[i];
+
+		if (!mlnx_is_started(mlnxeff)) {
+			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);
+
+			mlnx_clr_playing(mlnxeff);
+			if (--mlnxeff->repeat > 0)
+				mlnx_restart_effect(mlnxdev, mlnxeff);
+			else {
+				mlnx_stop_effect(mlnxdev, mlnxeff);
+				mlnx_clr_started(mlnxeff);
+				mlnx_clr_emulated(mlnxeff);
+				if (mlnx_is_conditional(&mlnxeff->effect))
+					mlnx_erase_conditional(mlnxdev, &mlnxeff->effect);
+			}
+
+			continue;
+		}
+
+		switch (mlnxeff->effect.type) {
+		case FF_PERIODIC:
+			if (mlnxdev->emul == EMUL_PERIODIC) {
+				if (!mlnx_test_set_playing(mlnxeff)) {
+					mlnxdev->rumble_playing++;
+					pr_debug("Starting emul periodic, total rumble %u\n",
+						 mlnxdev->rumble_playing);
+				}
+				__set_bit(FF_EFFECT_EMULATED, &mlnxeff->flags);
+				mlnx_add_emul_periodic(mlnxeff, &strong_mag, &weak_mag,
+						       &strong_dir, &weak_dir, gain);
+				break;
+			}
+		case FF_CONSTANT:
+		case FF_RAMP:
+			if (!mlnx_test_set_playing(mlnxeff)) {
+				mlnxdev->combinable_playing++;
+				pr_debug("Starting combinable effect, total %u\n",
+					 mlnxdev->combinable_playing);
+			}
+			mlnx_add_force(mlnxeff, &cfx, &cfy, gain);
+			break;
+		case FF_RUMBLE:
+			if (mlnxdev->emul == EMUL_RUMBLE) {
+				if (!mlnx_test_set_playing(mlnxeff)) {
+					mlnxdev->combinable_playing++;
+					pr_debug("Starting emul rumble, total comb %u\n",
+						 mlnxdev->combinable_playing);
+				}
+				__set_bit(FF_EFFECT_EMULATED, &mlnxeff->flags);
+				mlnx_add_emul_rumble(mlnxeff, &cfx, &cfy, gain, now,
+						     mlnxdev->update_rate_jiffies);
+			} else {
+				if (!mlnx_test_set_playing(mlnxeff)) {
+					mlnxdev->rumble_playing++;
+					pr_debug("Starting rumble effect, total %u\n",
+						 mlnxdev->rumble_playing);
+				}
+				mlnx_add_rumble(mlnxeff, &strong_mag, &weak_mag,
+						&strong_dir, &weak_dir, gain);
+			}
+			break;
+		case FF_DAMPER:
+		case FF_FRICTION:
+		case FF_INERTIA:
+		case FF_SPRING:
+			if (!mlnx_test_set_playing(mlnxeff)) {
+				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 = clamp(cfx, -0x7fff, 0x7fff),
+				.y = clamp(cfy, -0x7fff, 0x7fff)
+			}
+		};
+		mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private, &ecmd);
+	}
+	if (mlnxdev->rumble_playing) {
+		const struct mlnx_effect_command ecmd = {
+			.cmd = MLNX_START_RUMBLE,
+			.u.rumble_force = {
+				.strong = clamp(strong_mag, (u32)0, (u32)0xffffU),
+				.weak = clamp(weak_mag, (u32)0, (u32)0xffffU),
+				.strong_dir = clamp(strong_dir, (u16)0, (u16)0xffffU),
+				.weak_dir = clamp(weak_dir, (u16)0, (u16)0xffffU)
+			}
+		};
+		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++) {
+		struct mlnx_effect *eff = &mlnxdev->effects[i];
+		if (eff == NULL)
+			continue;
+		if (mlnx_is_playing(eff)) {
+			if (mlnx_is_combinable(&eff->effect)) {
+				mlnx_clr_playing(eff);
+				if (mlnx_is_emulated(eff))
+					--mlnxdev->rumble_playing;
+				else
+					--mlnxdev->combinable_playing;
+			} else if (mlnx_is_rumble(&eff->effect)) {
+				mlnx_clr_playing(eff);
+				if (mlnx_is_emulated(eff))
+					--mlnxdev->combinable_playing;
+				else
+					--mlnxdev->rumble_playing;
+			}
+		}
+	}
+
+	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];
+	int ret;
+
+	if (repeat > 0) {
+		pr_debug("Starting effect ID %d\n", effect_id);
+		mlnxeff->repeat = repeat;
+
+		if (!mlnx_is_started(mlnxeff)) {
+			/* Check that device has a free effect slot */
+			if (mlnx_is_conditional(&mlnxeff->effect)) {
+				ret = mlnx_upload_conditional(mlnxdev, &mlnxeff->effect);
+				if (ret) {
+					/* Device effect slots are all occupied */
+					pr_debug("No free effect slot for EID %d\n", effect_id);
+					return ret;
+				}
+			}
+			mlnx_start_effect(mlnxeff);
+		}
+	} else {
+		pr_debug("Stopping effect ID %d\n", effect_id);
+		if (mlnx_is_started(mlnxeff)) {
+			if (mlnx_is_playing(mlnxeff)) {
+				mlnx_clr_playing(mlnxeff);
+				mlnx_stop_effect(mlnxdev, mlnxeff);
+			}
+			mlnx_clr_started(mlnxeff);
+			mlnx_clr_emulated(mlnxeff);
+
+			if (mlnx_is_conditional(&mlnxeff->effect))
+				return mlnx_erase_conditional(mlnxdev, &mlnxeff->effect);
+		} else {
+			pr_debug("Effect ID %d already stopped\n", effect_id);
+			return 0;
+		}
+	}
+	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 u16 length = effect->replay.length;
+	const u16 delay = effect->replay.delay;
+	int ret, fade_from;
+
+	/* Effect's timing is below kernel timer resolution */
+	if (length && length < FF_MIN_EFFECT_LENGTH)
+		effect->replay.length = FF_MIN_EFFECT_LENGTH;
+	if (delay && delay < FF_MIN_EFFECT_LENGTH)
+		effect->replay.delay = FF_MIN_EFFECT_LENGTH;
+
+	/* Periodic effects must have a non-zero period */
+	if (effect->type == FF_PERIODIC) {
+		if (!effect->u.periodic.period)
+			return -EINVAL;
+	}
+	/* Ramp effects cannot be infinite */
+	if (effect->type == FF_RAMP && !length)
+		return -EINVAL;
+
+	if (mlnx_is_combinable(effect)) {
+		const struct ff_envelope *envelope = mlnx_get_envelope(effect);
+
+		/* Infinite effects cannot fade */
+		if (!length && envelope->fade_length > 0)
+			return -EINVAL;
+		/* Fade length cannot be greater than effect duration */
+		fade_from = (int)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 && fade_from > 0)
+			return -EINVAL;
+	}
+
+
+	spin_lock_irq(&dev->event_lock);
+	mlnxeff->effect = *effect; /* Keep internal copy of the effect */
+	/* Check if the effect being modified is playing */
+	if (mlnx_is_started(mlnxeff)) {
+		if (mlnx_is_playing(mlnxeff)) {
+			mlnx_clr_playing(mlnxeff);
+			ret = mlnx_restart_effect(mlnxdev, mlnxeff);
+
+			if (ret) {
+				/* Restore the original effect */
+				if (old)
+					mlnxeff->effect = *old;
+				spin_unlock_irq(&dev->event_lock);
+				return ret;
+			}
+		}
+
+		mlnx_schedule_playback(mlnxdev);
+	}
+
+	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;
+	const u16 min_update_rate = update_rate < FF_MIN_EFFECT_LENGTH ?
+				    FF_MIN_EFFECT_LENGTH : update_rate;
+
+	mlnxdev = kzalloc(sizeof(*mlnxdev), 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(min_update_rate);
+	input_set_capability(dev, EV_FF, FF_GAIN);
+	setup_timer(&mlnxdev->timer, mlnx_timer_fired, (unsigned long)dev);
+
+	/* Set up effect emulation if needed */
+	if (test_bit(FF_PERIODIC, dev->ffbit) &&
+	    !test_bit(FF_RUMBLE, dev->ffbit)) {
+		set_bit(FF_RUMBLE, dev->ffbit);
+		mlnxdev->emul = EMUL_RUMBLE;
+		pr_debug("Emulating RUMBLE with PERIODIC\n");
+	} else if (test_bit(FF_RUMBLE, dev->ffbit) &&
+		   !test_bit(FF_PERIODIC, dev->ffbit)) {
+		set_bit(FF_PERIODIC, dev->ffbit);
+		set_bit(FF_SINE, dev->ffbit);
+		set_bit(FF_SQUARE, dev->ffbit);
+		set_bit(FF_TRIANGLE, dev->ffbit);
+		set_bit(FF_SAW_DOWN, dev->ffbit);
+		set_bit(FF_SAW_UP, dev->ffbit);
+		mlnxdev->emul = EMUL_PERIODIC;
+		pr_debug("Emulating PERIODIC with RUMBLE\n");
+	} else {
+		mlnxdev->emul = EMUL_NOTHING;
+		pr_debug("No effect emulation is necessary\n");
+	}
+
+	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;
+
+	pr_debug("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..2f15897
--- /dev/null
+++ b/include/linux/input/ff-memless-next.h
@@ -0,0 +1,149 @@
+#include <linux/input.h>
+
+/** DEFINITION OF TERMS
+ *
+ * Combined effect - An effect whose force is a superposition of forces
+ *                   generated by all effects that can be added together.
+ *                   Only one combined effect can be playing at a time.
+ *                   Effects that can be added together to create a combined
+ *                   effect are FF_CONSTANT, FF_PERIODIC and FF_RAMP.
+ * Uncombinable effect - An effect that cannot be combined with another effect.
+ *                       All conditional effects - FF_DAMPER, FF_FRICTION,
+ *                       FF_INERTIA and FF_SPRING are uncombinable.
+ *                       Number of uncombinable effects playing simultaneously
+ *                       depends on the capabilities of the hardware.
+ * Rumble effect - An effect generated by device's rumble motors instead of
+ *                 force feedback actuators.
+ *
+ *
+ * HANDLING OF UNCOMBINABLE EFFECTS
+ *
+ * Uncombinable effects cannot be combined together into just one effect, at
+ * least not in a clear and obvious manner. Therefore these effects have to
+ * be handled individually by ff-memless-next. Handling of these effects is
+ * left entirely to the hardware-specific driver, ff-memless-next merely
+ * passes these effects to the hardware-specific driver at appropriate time.
+ * ff-memless-next provides the UPLOAD command to notify the hardware-specific
+ * driver that the userspace is about to request playback of an uncombinable
+ * effect. The hardware-specific driver shall take all steps needed to make
+ * the device ready to play the effect when it receives the UPLOAD command.
+ * The actual playback shall commence when START_UNCOMB command is received.
+ * Opposite to the UPLOAD command is the ERASE command which tells
+ * the hardware-specific driver that the playback has finished and that
+ * the effect will not be restarted. STOP_UNCOMB command tells
+ * the hardware-specific driver that the playback shall stop but the device
+ * shall still be ready to resume the playback immediately.
+ *
+ * In case it is not possible to make the device ready to play an uncombinable
+ * effect (all hardware effect slots are occupied), the hardware-specific
+ * driver may return an error when it receives an UPLOAD command. If the
+ * hardware-specific driver returns 0, the upload is considered successful.
+ * START_UNCOMB and STOP_UNCOMB commands cannot fail and the device must always
+ * start the playback of the requested effect if the UPLOAD command of the
+ * respective effect has been successful. ff-memless-next will never send
+ * a START/STOP_UNCOMB command for an effect that has not been uploaded
+ * successfully, nor will it send an ERASE command for an effect that is
+ * playing (= has been started with START_UNCOMB command).
+ */
+
+enum mlnx_commands {
+	/* Start or update a combined effect. This command is sent whenever
+	 * a FF_CONSTANT, FF_PERIODIC or FF_RAMP is started, stopped or
+	 * updated by userspace, when the applied envelopes are recalculated
+	 * or when periodic effects are recalculated. */
+	MLNX_START_COMBINED,
+	/* Stop combined effect. This command is sent when all combinable
+	 * effects are stopped. */
+	MLNX_STOP_COMBINED,
+	/* Start or update a rumble effect. This command is sent whenever
+	 * a FF_RUMBLE effect is started or when its magnitudes or directions
+	 * change. */
+	MLNX_START_RUMBLE,
+	/* Stop a rumble effect. This command is sent when all FF_RUMBLE
+	 * effects are stopped. */
+	MLNX_STOP_RUMBLE,
+	/* Start or update an uncombinable effect. This command is sent
+	 * whenever an uncombinable effect is started or updated. */
+	MLNX_START_UNCOMB,
+	/* Stop uncombinable effect. This command is sent when an uncombinable
+	 * effect is stopped. */
+	MLNX_STOP_UNCOMB,
+	/* Upload uncombinable effect to device. This command is sent when the
+	 * effect is started from userspace. It is up to the hardware-specific
+	 * driver to handle this situation.
+	 */
+	MLNX_UPLOAD_UNCOMB,
+	/* Remove uncombinable effect from device, This command is sent when
+	 * and uncombinable effect has finished playing and will not be
+	 * restarted.
+	 */
+	MLNX_ERASE_UNCOMB
+};
+
+/** struct mlnx_simple_force - holds constant forces along X and Y axis
+ * @x: Force along X axis. Negative value denotes force pulling to the left,
+ *     positive value denotes force pulling to the right.
+ * @y: Force along Y axis. Negative value denotes force denotes force pulling
+ *     away from the user, positive value denotes force pulling towards
+ *     the user.
+ */
+struct mlnx_simple_force {
+	const s32 x;
+	const s32 y;
+};
+
+/** struct mlnx_rumble_force - holds information about rumble effect
+ * @strong: Magnitude of the strong vibration.
+ * @weak: Magnitude of the weak vibration.
+ * @strong_dir: Direction of the strong vibration expressed in the same way
+ *              as the direction of force feedback effect in struct ff_effect.
+ * @weak_dir: Direction of the weak vibration, same as above applies.
+ */
+struct mlnx_rumble_force {
+	const u32 strong;
+	const u32 weak;
+	const u16 strong_dir;
+	const u16 weak_dir;
+};
+
+/** struct mlnx_uncomb_effect - holds information about uncombinable effect
+ * @id: Id of the effect assigned by ff-core.
+ * @effect: Pointer to the uncombinable effect stored in ff-memless-next module
+ *          Hardware-specific driver must not alter this.
+ */
+struct mlnx_uncomb_effect {
+	const int id;
+	const struct ff_effect *effect;
+};
+
+/** struct mlnx_commands - describes what action shall the force feedback
+ *                         device perform
+ * @cmd: Type of the action.
+ * @u: Data associated with the action.
+ */
+struct mlnx_effect_command {
+	const enum mlnx_commands cmd;
+	union {
+		const struct mlnx_simple_force simple_force;
+		const struct mlnx_rumble_force rumble_force;
+		const struct mlnx_uncomb_effect uncomb;
+	} u;
+};
+
+/** input_ff_create_mlnx() - Register a device within ff-memless-next and
+ *                           the kernel force feedback system
+ * @dev: Pointer to the struct input_dev associated with the device.
+ * @data: Any device-specific data that shall be passed to the callback.
+ *        function called by ff-memless-next when a force feedback action
+ *        shall be performed.
+ * @control_effect: Pointer to the callback function.
+ * @update_date: Delay in milliseconds between two recalculations of periodic
+ *               effects, ramp effects and envelopes. Note that this value will
+ *               never be lower than (CONFIG_HZ / 1000) + 1 regardless of the
+ *               value specified here. This is not a "hard" rate limiter.
+ *               Userspace still can submit effects at a rate faster than
+ *               this value.
+ */
+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);
-- 
1.9.2

[PATCH v2 02/24] input: Port arizona-haptics to ff-memless-next

[Michal Malý]

Port arizona-haptics to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/input/misc/Kconfig           |  2 +-
 drivers/input/misc/arizona-haptics.c | 39 +++++++++++++++++++++++-------------
 2 files changed, 26 insertions(+), 15 deletions(-)

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 7904ab0..33e0f5d 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -75,7 +75,7 @@ config INPUT_AD714X_SPI
 config INPUT_ARIZONA_HAPTICS
 	tristate "Arizona haptics support"
 	depends on MFD_ARIZONA && SND_SOC
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	help
 	  Say Y to enable support for the haptics module in Arizona CODECs.
 
diff --git a/drivers/input/misc/arizona-haptics.c b/drivers/input/misc/arizona-haptics.c
index ef2e281..b4707cc 100644
--- a/drivers/input/misc/arizona-haptics.c
+++ b/drivers/input/misc/arizona-haptics.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/input.h>
+#include <linux/input/ff-memless-next.h>
 #include <linux/slab.h>
 
 #include <sound/soc.h>
@@ -22,6 +23,8 @@
 #include <linux/mfd/arizona/pdata.h>
 #include <linux/mfd/arizona/registers.h>
 
+#define FF_UPDATE_RATE 50
+
 struct arizona_haptics {
 	struct arizona *arizona;
 	struct input_dev *input_dev;
@@ -108,29 +111,37 @@ static void arizona_haptics_work(struct work_struct *work)
 }
 
 static int arizona_haptics_play(struct input_dev *input, void *data,
-				struct ff_effect *effect)
+				const struct mlnx_effect_command *command)
 {
 	struct arizona_haptics *haptics = input_get_drvdata(input);
 	struct arizona *arizona = haptics->arizona;
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
 
 	if (!arizona->dapm) {
 		dev_err(arizona->dev, "No DAPM context\n");
 		return -EBUSY;
 	}
 
-	if (effect->u.rumble.strong_magnitude) {
-		/* Scale the magnitude into the range the device supports */
-		if (arizona->pdata.hap_act) {
-			haptics->intensity =
-				effect->u.rumble.strong_magnitude >> 9;
-			if (effect->direction < 0x8000)
-				haptics->intensity += 0x7f;
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		if (rumble_force->strong) {
+			/* Scale the magnitude into the range the device supports */
+			if (arizona->pdata.hap_act) {
+				haptics->intensity = rumble_force->strong >> 9;
+				if (rumble_force->strong_dir < 0x8000)
+					haptics->intensity += 0x7f;
+			} else {
+				haptics->intensity = rumble_force->strong >> 8;
+			}
 		} else {
-			haptics->intensity =
-				effect->u.rumble.strong_magnitude >> 8;
+			haptics->intensity = 0;
 		}
-	} else {
+		break;
+	case MLNX_STOP_RUMBLE:
 		haptics->intensity = 0;
+		break;
+	default:
+		return -EINVAL;
 	}
 
 	schedule_work(&haptics->work);
@@ -183,10 +194,10 @@ static int arizona_haptics_probe(struct platform_device *pdev)
 	haptics->input_dev->close = arizona_haptics_close;
 	__set_bit(FF_RUMBLE, haptics->input_dev->ffbit);
 
-	ret = input_ff_create_memless(haptics->input_dev, NULL,
-				      arizona_haptics_play);
+	ret = input_ff_create_mlnx(haptics->input_dev, NULL,
+				   arizona_haptics_play, FF_UPDATE_RATE);
 	if (ret < 0) {
-		dev_err(arizona->dev, "input_ff_create_memless() failed: %d\n",
+		dev_err(arizona->dev, "input_ff_create_mlnx() failed: %d\n",
 			ret);
 		goto err_ialloc;
 	}
-- 
1.9.2

[PATCH v2 03/24] input: Port twl4030-vibra to ff-memless-next

[Michal Malý]

Port twl4030-vibra to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/input/misc/Kconfig         |  2 +-
 drivers/input/misc/twl4030-vibra.c | 31 +++++++++++++++++++++++++------
 2 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 33e0f5d..1016a1b 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -407,7 +407,7 @@ config INPUT_TWL4030_VIBRA
 	tristate "Support for TWL4030 Vibrator"
 	depends on TWL4030_CORE
 	select MFD_TWL4030_AUDIO
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	help
 	  This option enables support for TWL4030 Vibrator Driver.
 
diff --git a/drivers/input/misc/twl4030-vibra.c b/drivers/input/misc/twl4030-vibra.c
index 960ef2a..5274ad2 100644
--- a/drivers/input/misc/twl4030-vibra.c
+++ b/drivers/input/misc/twl4030-vibra.c
@@ -32,9 +32,11 @@
 #include <linux/mfd/twl4030-audio.h>
 #include <linux/input.h>
 #include <linux/slab.h>
+#include <linux/input/ff-memless-next.h>
 
 /* MODULE ID2 */
 #define LEDEN		0x00
+#define FF_UPDATE_RATE	50
 
 /* ForceFeedback */
 #define EFFECT_DIR_180_DEG	0x8000 /* range is 0 - 0xFFFF */
@@ -134,14 +136,31 @@ static void vibra_play_work(struct work_struct *work)
 /*** Input/ForceFeedback ***/
 
 static int vibra_play(struct input_dev *input, void *data,
-		      struct ff_effect *effect)
+		      const struct mlnx_effect_command *command)
 {
 	struct vibra_info *info = input_get_drvdata(input);
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
+
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		if (command->u.rumble_force.strong) {
+			info->speed = rumble_force->strong >> 8;
+			info->direction = rumble_force->strong_dir < EFFECT_DIR_180_DEG ?
+					  0 : 1;
+		} else {
+			info->speed = rumble_force->weak >> 9;
+			info->direction = rumble_force->weak_dir < EFFECT_DIR_180_DEG ?
+					  0 : 1;
+		}
+		break;
+	case MLNX_STOP_RUMBLE:
+		info->speed = 0;
+		info->direction = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
 
-	info->speed = effect->u.rumble.strong_magnitude >> 8;
-	if (!info->speed)
-		info->speed = effect->u.rumble.weak_magnitude >> 9;
-	info->direction = effect->direction < EFFECT_DIR_180_DEG ? 0 : 1;
 	schedule_work(&info->play_work);
 	return 0;
 }
@@ -227,7 +246,7 @@ static int twl4030_vibra_probe(struct platform_device *pdev)
 	info->input_dev->close = twl4030_vibra_close;
 	__set_bit(FF_RUMBLE, info->input_dev->ffbit);
 
-	ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
+	ret = input_ff_create_mlnx(info->input_dev, NULL, vibra_play, FF_UPDATE_RATE);
 	if (ret < 0) {
 		dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
 		return ret;
-- 
1.9.2

[PATCH v2 04/24] input: Port twl6040-vibra to ff-memless-next

[Michal Malý]

Port twl6040-vibra to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/input/misc/Kconfig         |  2 +-
 drivers/input/misc/twl6040-vibra.c | 27 ++++++++++++++++++++++-----
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 1016a1b..91dcae8 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -417,7 +417,7 @@ config INPUT_TWL4030_VIBRA
 config INPUT_TWL6040_VIBRA
 	tristate "Support for TWL6040 Vibrator"
 	depends on TWL6040_CORE
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	help
 	  This option enables support for TWL6040 Vibrator Driver.
 
diff --git a/drivers/input/misc/twl6040-vibra.c b/drivers/input/misc/twl6040-vibra.c
index 77dc23b..7440a74 100644
--- a/drivers/input/misc/twl6040-vibra.c
+++ b/drivers/input/misc/twl6040-vibra.c
@@ -30,12 +30,14 @@
 #include <linux/of.h>
 #include <linux/workqueue.h>
 #include <linux/input.h>
+#include <linux/input/ff-memless-next.h>
 #include <linux/mfd/twl6040.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/regulator/consumer.h>
 
 #define EFFECT_DIR_180_DEG	0x8000
+#define FF_UPDATE_RATE		50
 
 /* Recommended modulation index 85% */
 #define TWL6040_VIBRA_MOD	85
@@ -197,9 +199,10 @@ static void vibra_play_work(struct work_struct *work)
 }
 
 static int vibra_play(struct input_dev *input, void *data,
-		      struct ff_effect *effect)
+		      const struct mlnx_effect_command *command)
 {
 	struct vibra_info *info = input_get_drvdata(input);
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
 	int ret;
 
 	/* Do not allow effect, while the routing is set to use audio */
@@ -209,9 +212,23 @@ static int vibra_play(struct input_dev *input, void *data,
 		return -EBUSY;
 	}
 
-	info->weak_speed = effect->u.rumble.weak_magnitude;
-	info->strong_speed = effect->u.rumble.strong_magnitude;
-	info->direction = effect->direction < EFFECT_DIR_180_DEG ? 1 : -1;
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		info->weak_speed = rumble_force->weak;
+		info->strong_speed = rumble_force->strong;
+		if (info->strong_speed >= info->weak_speed)
+			info->direction = rumble_force->strong_dir < EFFECT_DIR_180_DEG ? 1 : -1;
+		else
+			info->direction = rumble_force->weak_dir < EFFECT_DIR_180_DEG ? 1 : -1;
+		break;
+	case MLNX_STOP_RUMBLE:
+		info->weak_speed = 0;
+		info->strong_speed = 0;
+		info->direction = 1;
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	ret = queue_work(info->workqueue, &info->play_work);
 	if (!ret) {
@@ -367,7 +384,7 @@ static int twl6040_vibra_probe(struct platform_device *pdev)
 	info->input_dev->close = twl6040_vibra_close;
 	__set_bit(FF_RUMBLE, info->input_dev->ffbit);
 
-	ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
+	ret = input_ff_create_mlnx(info->input_dev, NULL, vibra_play, FF_UPDATE_RATE);
 	if (ret < 0) {
 		dev_err(info->dev, "couldn't register vibrator to FF\n");
 		goto err_ialloc;
-- 
1.9.2

[PATCH v2 05/24] input: Port max8997_haptic to ff-memless-next

[Michal Malý]

Port max8997_haptic to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/input/misc/Kconfig          |  2 +-
 drivers/input/misc/max8997_haptic.c | 25 +++++++++++++++++++------
 2 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 91dcae8..6ba327f 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -157,7 +157,7 @@ config INPUT_MAX8925_ONKEY
 config INPUT_MAX8997_HAPTIC
 	tristate "MAXIM MAX8997 haptic controller support"
 	depends on PWM && HAVE_PWM && MFD_MAX8997
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	help
 	  This option enables device driver support for the haptic controller
 	  on MAXIM MAX8997 chip. This driver supports ff-memless interface
diff --git a/drivers/input/misc/max8997_haptic.c b/drivers/input/misc/max8997_haptic.c
index 1fea548..029ac8b 100644
--- a/drivers/input/misc/max8997_haptic.c
+++ b/drivers/input/misc/max8997_haptic.c
@@ -31,6 +31,7 @@
 #include <linux/mfd/max8997-private.h>
 #include <linux/mfd/max8997.h>
 #include <linux/regulator/consumer.h>
+#include <linux/input/ff-memless-next.h>
 
 /* Haptic configuration 2 register */
 #define MAX8997_MOTOR_TYPE_SHIFT	7
@@ -43,6 +44,8 @@
 #define MAX8997_SIG_DUTY_SHIFT		2
 #define MAX8997_PWM_DUTY_SHIFT		0
 
+#define FF_UPDATE_RATE 50
+
 struct max8997_haptic {
 	struct device *dev;
 	struct i2c_client *client;
@@ -219,13 +222,23 @@ static void max8997_haptic_play_effect_work(struct work_struct *work)
 }
 
 static int max8997_haptic_play_effect(struct input_dev *dev, void *data,
-				  struct ff_effect *effect)
+				  const struct mlnx_effect_command *command)
 {
 	struct max8997_haptic *chip = input_get_drvdata(dev);
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
 
-	chip->level = effect->u.rumble.strong_magnitude;
-	if (!chip->level)
-		chip->level = effect->u.rumble.weak_magnitude;
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		chip->level = rumble_force->strong;
+		if (!chip->level)
+			chip->level = rumble_force->weak;
+		break;
+	case MLNX_STOP_RUMBLE:
+		chip->level = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	schedule_work(&chip->work);
 
@@ -319,8 +332,8 @@ static int max8997_haptic_probe(struct platform_device *pdev)
 	input_set_drvdata(input_dev, chip);
 	input_set_capability(input_dev, EV_FF, FF_RUMBLE);
 
-	error = input_ff_create_memless(input_dev, NULL,
-				max8997_haptic_play_effect);
+	error = input_ff_create_mlnx(input_dev, NULL,
+				max8997_haptic_play_effect, FF_UPDATE_RATE);
 	if (error) {
 		dev_err(&pdev->dev,
 			"unable to create FF device, error: %d\n",
-- 
1.9.2

[PATCH v2 06/24] input: Port pm8xxx-vibrator to ff-memless-next

[Michal Malý]

Port pm8xxx-vibrator to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/input/misc/Kconfig           |  2 +-
 drivers/input/misc/pm8xxx-vibrator.c | 28 +++++++++++++++++++---------
 2 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 6ba327f..300b5a8 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -108,7 +108,7 @@ config INPUT_PCSPKR
 config INPUT_PM8XXX_VIBRATOR
 	tristate "Qualcomm PM8XXX vibrator support"
 	depends on MFD_PM8XXX
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	help
 	  This option enables device driver support for the vibrator
 	  on Qualcomm PM8xxx chip. This driver supports ff-memless interface
diff --git a/drivers/input/misc/pm8xxx-vibrator.c b/drivers/input/misc/pm8xxx-vibrator.c
index b88b7cb..6b0e9eb 100644
--- a/drivers/input/misc/pm8xxx-vibrator.c
+++ b/drivers/input/misc/pm8xxx-vibrator.c
@@ -17,6 +17,7 @@
 #include <linux/input.h>
 #include <linux/slab.h>
 #include <linux/regmap.h>
+#include <linux/input/ff-memless-next.h>
 
 #define VIB_DRV			0x4A
 
@@ -29,7 +30,7 @@
 #define VIB_MAX_LEVELS		(VIB_MAX_LEVEL_mV - VIB_MIN_LEVEL_mV)
 
 #define MAX_FF_SPEED		0xff
-
+#define FF_UPDATE_RATE		50
 /**
  * struct pm8xxx_vib - structure to hold vibrator data
  * @vib_input_dev: input device supporting force feedback
@@ -128,14 +129,23 @@ static void pm8xxx_vib_close(struct input_dev *dev)
  * Currently this driver supports only rumble effects.
  */
 static int pm8xxx_vib_play_effect(struct input_dev *dev, void *data,
-				  struct ff_effect *effect)
+				  const struct mlnx_command *command)
 {
 	struct pm8xxx_vib *vib = input_get_drvdata(dev);
-
-	vib->speed = effect->u.rumble.strong_magnitude >> 8;
-	if (!vib->speed)
-		vib->speed = effect->u.rumble.weak_magnitude >> 9;
-
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
+
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		vib->speed = rumble_force->strong >> 8;
+		if (!vib->speed)
+			vib->speed = rumble_force->weak >> 9;
+		break;
+	case MLNX_STOP_RUMBLE:
+		vib->speed = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
 	schedule_work(&vib->work);
 
 	return 0;
@@ -182,8 +192,8 @@ static int pm8xxx_vib_probe(struct platform_device *pdev)
 	input_set_drvdata(input_dev, vib);
 	input_set_capability(vib->vib_input_dev, EV_FF, FF_RUMBLE);
 
-	error = input_ff_create_memless(input_dev, NULL,
-					pm8xxx_vib_play_effect);
+	error = input_ff_create_mlnx(input_dev, NULL,
+				     pm8xxx_vib_play_effect, FF_UPDATE_RATE);
 	if (error) {
 		dev_err(&pdev->dev,
 			"couldn't register vibrator as FF device\n");
-- 
1.9.2

[PATCH v2 07/24] input: Port hid-axff to ff-memless-next

[Michal Malý]

Port hid-axff to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig    |  2 +-
 drivers/hid/hid-axff.c | 32 +++++++++++++++++++++++---------
 2 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index f722001..68c19a0 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -106,7 +106,7 @@ config HID_ACRUX
 config HID_ACRUX_FF
 	bool "ACRUX force feedback support"
 	depends on HID_ACRUX
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	---help---
 	Say Y here if you want to enable force feedback support for ACRUX
 	game controllers.
diff --git a/drivers/hid/hid-axff.c b/drivers/hid/hid-axff.c
index a594e47..7fbfcbc 100644
--- a/drivers/hid/hid-axff.c
+++ b/drivers/hid/hid-axff.c
@@ -31,31 +31,45 @@
 #include <linux/slab.h>
 #include <linux/hid.h>
 #include <linux/module.h>
+#include <linux/input/ff-memless-next.h>
 
 #include "hid-ids.h"
 
+#define FF_UPDATE_RATE 50
 #ifdef CONFIG_HID_ACRUX_FF
 
 struct axff_device {
 	struct hid_report *report;
 };
 
-static int axff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
+static int axff_play(struct input_dev *dev, void *data,
+		     const struct mlnx_effect_command *command)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct axff_device *axff = data;
 	struct hid_report *report = axff->report;
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
 	int field_count = 0;
 	int left, right;
 	int i, j;
 
-	left = effect->u.rumble.strong_magnitude;
-	right = effect->u.rumble.weak_magnitude;
-
-	dbg_hid("called with 0x%04x 0x%04x", left, right);
-
-	left = left * 0xff / 0xffff;
-	right = right * 0xff / 0xffff;
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		left = rumble_force->strong;
+		right = rumble_force->weak;
+
+		dbg_hid("called with 0x%04x 0x%04x", left, right);
+
+		left = left * 0xff / 0xffff;
+		right = right * 0xff / 0xffff;
+		break;
+	case MLNX_STOP_RUMBLE:
+		left = 0;
+		right = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	for (i = 0; i < report->maxfield; i++) {
 		for (j = 0; j < report->field[i]->report_count; j++) {
@@ -107,7 +121,7 @@ static int axff_init(struct hid_device *hid)
 
 	set_bit(FF_RUMBLE, dev->ffbit);
 
-	error = input_ff_create_memless(dev, axff, axff_play);
+	error = input_ff_create_mlnx(dev, axff, axff_play, FF_UPDATE_RATE);
 	if (error)
 		goto err_free_mem;
 
-- 
1.9.2

[PATCH v2 08/24] input: Port hid-emsff to ff-memless-next

[Michal Malý]

Port hid-emsff to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig     |  2 +-
 drivers/hid/hid-emsff.c | 38 ++++++++++++++++++++++++++------------
 2 files changed, 27 insertions(+), 13 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 68c19a0..6e233d2 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -204,7 +204,7 @@ config DRAGONRISE_FF
 config HID_EMS_FF
 	tristate "EMS Production Inc. force feedback support"
 	depends on HID
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	---help---
 	Say Y here if you want to enable force feedback support for devices by
 	EMS Production Ltd.
diff --git a/drivers/hid/hid-emsff.c b/drivers/hid/hid-emsff.c
index d82d75b..c0cbe50 100644
--- a/drivers/hid/hid-emsff.c
+++ b/drivers/hid/hid-emsff.c
@@ -24,30 +24,44 @@
 #include <linux/hid.h>
 #include <linux/input.h>
 #include <linux/module.h>
+#include <linux/input/ff-memless-next.h>
 
 #include "hid-ids.h"
 
+#define FF_UPDATE_RATE 50
+
 struct emsff_device {
 	struct hid_report *report;
 };
 
 static int emsff_play(struct input_dev *dev, void *data,
-			 struct ff_effect *effect)
+			 const struct mlnx_effect_command *command)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct emsff_device *emsff = data;
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
 	int weak, strong;
 
-	weak = effect->u.rumble.weak_magnitude;
-	strong = effect->u.rumble.strong_magnitude;
-
-	dbg_hid("called with 0x%04x 0x%04x\n", strong, weak);
-
-	weak = weak * 0xff / 0xffff;
-	strong = strong * 0xff / 0xffff;
-
-	emsff->report->field[0]->value[1] = weak;
-	emsff->report->field[0]->value[2] = strong;
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		weak = rumble_force->weak;
+		strong = rumble_force->strong;
+
+		dbg_hid("called with 0x%04x 0x%04x\n", strong, weak);
+
+		weak = weak * 0xff / 0xffff;
+		strong = strong * 0xff / 0xffff;
+
+		emsff->report->field[0]->value[1] = weak;
+		emsff->report->field[0]->value[2] = strong;
+		break;
+	case MLNX_STOP_RUMBLE:
+		weak = 0;
+		strong = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	dbg_hid("running with 0x%02x 0x%02x\n", strong, weak);
 	hid_hw_request(hid, emsff->report, HID_REQ_SET_REPORT);
@@ -88,7 +102,7 @@ static int emsff_init(struct hid_device *hid)
 
 	set_bit(FF_RUMBLE, dev->ffbit);
 
-	error = input_ff_create_memless(dev, emsff, emsff_play);
+	error = input_ff_create_mlnx(dev, emsff, emsff_play, FF_UPDATE_RATE);
 	if (error) {
 		kfree(emsff);
 		return error;
-- 
1.9.2

[PATCH v2 09/24] input: Port hid-dr to ff-memless-next

[Michal Malý]

Port hid-dr to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig  |  2 +-
 drivers/hid/hid-dr.c | 59 ++++++++++++++++++++++++++++++++--------------------
 2 files changed, 37 insertions(+), 24 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 6e233d2..0ba1962 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -196,7 +196,7 @@ config HID_DRAGONRISE
 config DRAGONRISE_FF
 	bool "DragonRise Inc. force feedback"
 	depends on HID_DRAGONRISE
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	---help---
 	Say Y here if you want to enable force feedback support for DragonRise Inc.
 	game controllers.
diff --git a/drivers/hid/hid-dr.c b/drivers/hid/hid-dr.c
index ce06444..b95c676 100644
--- a/drivers/hid/hid-dr.c
+++ b/drivers/hid/hid-dr.c
@@ -31,8 +31,10 @@
 #include <linux/slab.h>
 #include <linux/hid.h>
 #include <linux/module.h>
+#include <linux/input/ff-memless-next.h>
 
 #include "hid-ids.h"
+#define FF_UPDATE_RATE 50
 
 #ifdef CONFIG_DRAGONRISE_FF
 
@@ -41,38 +43,49 @@ struct drff_device {
 };
 
 static int drff_play(struct input_dev *dev, void *data,
-				 struct ff_effect *effect)
+			const struct mlnx_effect_command *command)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct drff_device *drff = data;
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
 	int strong, weak;
 
-	strong = effect->u.rumble.strong_magnitude;
-	weak = effect->u.rumble.weak_magnitude;
+	strong = rumble_force->strong;
+	weak = rumble_force->weak;
 
 	dbg_hid("called with 0x%04x 0x%04x", strong, weak);
 
-	if (strong || weak) {
-		strong = strong * 0xff / 0xffff;
-		weak = weak * 0xff / 0xffff;
-
-		/* While reverse engineering this device, I found that when
-		   this value is set, it causes the strong rumble to function
-		   at a near maximum speed, so we'll bypass it. */
-		if (weak == 0x0a)
-			weak = 0x0b;
-
-		drff->report->field[0]->value[0] = 0x51;
-		drff->report->field[0]->value[1] = 0x00;
-		drff->report->field[0]->value[2] = weak;
-		drff->report->field[0]->value[4] = strong;
-		hid_hw_request(hid, drff->report, HID_REQ_SET_REPORT);
-
-		drff->report->field[0]->value[0] = 0xfa;
-		drff->report->field[0]->value[1] = 0xfe;
-	} else {
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		if (strong || weak) {
+			strong = strong * 0xff / 0xffff;
+			weak = weak * 0xff / 0xffff;
+
+			/* While reverse engineering this device, I found that when
+			this value is set, it causes the strong rumble to function
+			at a near maximum speed, so we'll bypass it. */
+			if (weak == 0x0a)
+				weak = 0x0b;
+
+			drff->report->field[0]->value[0] = 0x51;
+			drff->report->field[0]->value[1] = 0x00;
+			drff->report->field[0]->value[2] = weak;
+			drff->report->field[0]->value[4] = strong;
+			hid_hw_request(hid, drff->report, HID_REQ_SET_REPORT);
+
+			drff->report->field[0]->value[0] = 0xfa;
+			drff->report->field[0]->value[1] = 0xfe;
+		} else {
+			drff->report->field[0]->value[0] = 0xf3;
+			drff->report->field[0]->value[1] = 0x00;
+		}
+		break;
+	case MLNX_STOP_RUMBLE:
 		drff->report->field[0]->value[0] = 0xf3;
 		drff->report->field[0]->value[1] = 0x00;
+		break;
+	default:
+		return -EINVAL;
 	}
 
 	drff->report->field[0]->value[2] = 0x00;
@@ -116,7 +129,7 @@ static int drff_init(struct hid_device *hid)
 
 	set_bit(FF_RUMBLE, dev->ffbit);
 
-	error = input_ff_create_memless(dev, drff, drff_play);
+	error = input_ff_create_mlnx(dev, drff, drff_play, FF_UPDATE_RATE);
 	if (error) {
 		kfree(drff);
 		return error;
-- 
1.9.2

[PATCH v2 10/24] input: Port hid-gaff to ff-memless-next

[Michal Malý]

Port hid-gaff to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig    |  2 +-
 drivers/hid/hid-gaff.c | 32 +++++++++++++++++++++++---------
 2 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 0ba1962..24b336e 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -656,7 +656,7 @@ config HID_GREENASIA
 config GREENASIA_FF
 	bool "GreenAsia (Product ID 0x12) force feedback support"
 	depends on HID_GREENASIA
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	---help---
 	Say Y here if you have a GreenAsia (Product ID 0x12) based game controller
 	(like MANTA Warrior MM816 and SpeedLink Strike2 SL-6635) or adapter
diff --git a/drivers/hid/hid-gaff.c b/drivers/hid/hid-gaff.c
index 2d8cead..f2f70c1 100644
--- a/drivers/hid/hid-gaff.c
+++ b/drivers/hid/hid-gaff.c
@@ -31,8 +31,11 @@
 #include <linux/slab.h>
 #include <linux/hid.h>
 #include <linux/module.h>
+#include <linux/input/ff-memless-next.h>
 #include "hid-ids.h"
 
+#define FF_UPDATE_RATE 50
+
 #ifdef CONFIG_GREENASIA_FF
 
 struct gaff_device {
@@ -40,19 +43,30 @@ struct gaff_device {
 };
 
 static int hid_gaff_play(struct input_dev *dev, void *data,
-			 struct ff_effect *effect)
+			 const struct mlnx_effect_command *command)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct gaff_device *gaff = data;
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
 	int left, right;
 
-	left = effect->u.rumble.strong_magnitude;
-	right = effect->u.rumble.weak_magnitude;
-
-	dbg_hid("called with 0x%04x 0x%04x", left, right);
-
-	left = left * 0xfe / 0xffff;
-	right = right * 0xfe / 0xffff;
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		left = rumble_force->strong;
+		right = rumble_force->weak;
+
+		dbg_hid("called with 0x%04x 0x%04x", left, right);
+
+		left = left * 0xfe / 0xffff;
+		right = right * 0xfe / 0xffff;
+		break;
+	case MLNX_STOP_RUMBLE:
+		left = 0;
+		right = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	gaff->report->field[0]->value[0] = 0x51;
 	gaff->report->field[0]->value[1] = 0x0;
@@ -109,7 +123,7 @@ static int gaff_init(struct hid_device *hid)
 
 	set_bit(FF_RUMBLE, dev->ffbit);
 
-	error = input_ff_create_memless(dev, gaff, hid_gaff_play);
+	error = input_ff_create_mlnx(dev, gaff, hid_gaff_play, FF_UPDATE_RATE);
 	if (error) {
 		kfree(gaff);
 		return error;
-- 
1.9.2

[PATCH v2 11/24] input: Port hid-holtekff to ff-memless-next

[Michal Malý]

Port hid-holtekff to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig        |  2 +-
 drivers/hid/hid-holtekff.c | 47 +++++++++++++++++++++++++++++-----------------
 2 files changed, 31 insertions(+), 18 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 24b336e..d1d4e77 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -247,7 +247,7 @@ config HID_HOLTEK
 config HOLTEK_FF
 	bool "Holtek On Line Grip force feedback support"
 	depends on HID_HOLTEK
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	---help---
 	  Say Y here if you have a Holtek On Line Grip based game controller
 	  and want to have force feedback support for it.
diff --git a/drivers/hid/hid-holtekff.c b/drivers/hid/hid-holtekff.c
index 9325545..9c6064d 100644
--- a/drivers/hid/hid-holtekff.c
+++ b/drivers/hid/hid-holtekff.c
@@ -27,9 +27,12 @@
 #include <linux/input.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/input/ff-memless-next.h>
 
 #include "hid-ids.h"
 
+#define FF_UPDATE_RATE 50
+
 #ifdef CONFIG_HOLTEK_FF
 
 MODULE_LICENSE("GPL");
@@ -104,34 +107,44 @@ static void holtekff_send(struct holtekff_device *holtekff,
 }
 
 static int holtekff_play(struct input_dev *dev, void *data,
-			 struct ff_effect *effect)
+			 const struct mlnx_effect_command *command)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct holtekff_device *holtekff = data;
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
 	int left, right;
 	/* effect type 1, length 65535 msec */
 	u8 buf[HOLTEKFF_MSG_LENGTH] =
 		{ 0x01, 0x01, 0xff, 0xff, 0x10, 0xe0, 0x00 };
 
-	left = effect->u.rumble.strong_magnitude;
-	right = effect->u.rumble.weak_magnitude;
-	dbg_hid("called with 0x%04x 0x%04x\n", left, right);
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		left = rumble_force->strong;
+		right = rumble_force->weak;
+		dbg_hid("called with 0x%04x 0x%04x\n", left, right);
 
-	if (!left && !right) {
-		holtekff_send(holtekff, hid, stop_all6);
-		return 0;
-	}
+		if (!left && !right) {
+			holtekff_send(holtekff, hid, stop_all6);
+			return 0;
+		}
 
-	if (left)
-		buf[1] |= 0x80;
-	if (right)
-		buf[1] |= 0x40;
+		if (left)
+			buf[1] |= 0x80;
+		if (right)
+			buf[1] |= 0x40;
 
-	/* The device takes a single magnitude, so we just sum them up. */
-	buf[6] = min(0xf, (left >> 12) + (right >> 12));
+		/* The device takes a single magnitude, so we just sum them up. */
+		buf[6] = min(0xf, (left >> 12) + (right >> 12));
 
-	holtekff_send(holtekff, hid, buf);
-	holtekff_send(holtekff, hid, start_effect_1);
+		holtekff_send(holtekff, hid, buf);
+		holtekff_send(holtekff, hid, start_effect_1);
+		return 0;
+	case MLNX_STOP_RUMBLE:
+		holtekff_send(holtekff, hid, stop_all6);
+		return 0;
+	default:
+		return -EINVAL;
+	}
 
 	return 0;
 }
@@ -171,7 +184,7 @@ static int holtekff_init(struct hid_device *hid)
 	holtekff_send(holtekff, hid, stop_all4);
 	holtekff_send(holtekff, hid, stop_all6);
 
-	error = input_ff_create_memless(dev, holtekff, holtekff_play);
+	error = input_ff_create_mlnx(dev, holtekff, holtekff_play, FF_UPDATE_RATE);
 	if (error) {
 		kfree(holtekff);
 		return error;
-- 
1.9.2

[PATCH v2 12/24] input: Port hid-lgff to ff-memless-next

[Michal Malý]

Port hid-lgff to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig    |  2 +-
 drivers/hid/hid-lgff.c | 70 +++++++++++++++++++++++++++++++++++---------------
 2 files changed, 51 insertions(+), 21 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index d1d4e77..c7794ae 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -356,7 +356,7 @@ config HID_LOGITECH_DJ
 config LOGITECH_FF
 	bool "Logitech force feedback support"
 	depends on HID_LOGITECH
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	help
 	  Say Y here if you have one of these devices:
 	  - Logitech WingMan Cordless RumblePad
diff --git a/drivers/hid/hid-lgff.c b/drivers/hid/hid-lgff.c
index e1394af..96d418c 100644
--- a/drivers/hid/hid-lgff.c
+++ b/drivers/hid/hid-lgff.c
@@ -31,9 +31,12 @@
 
 #include <linux/input.h>
 #include <linux/hid.h>
+#include <linux/input/ff-memless-next.h>
 
 #include "hid-lg.h"
 
+#define FF_UPDATE_RATE 50
+
 struct dev_type {
 	u16 idVendor;
 	u16 idProduct;
@@ -47,11 +50,25 @@ static const signed short ff_rumble[] = {
 
 static const signed short ff_joystick[] = {
 	FF_CONSTANT,
+	FF_RAMP,
+	FF_PERIODIC,
+	FF_SQUARE,
+	FF_TRIANGLE,
+	FF_SINE,
+	FF_SAW_UP,
+	FF_SAW_DOWN,
 	-1
 };
 
 static const signed short ff_joystick_ac[] = {
 	FF_CONSTANT,
+	FF_RAMP,
+	FF_PERIODIC,
+	FF_SQUARE,
+	FF_TRIANGLE,
+	FF_SINE,
+	FF_SAW_UP,
+	FF_SAW_DOWN,
 	FF_AUTOCENTER,
 	-1
 };
@@ -66,45 +83,58 @@ static const struct dev_type devices[] = {
 	{ 0x046d, 0xc295, ff_joystick },
 };
 
-static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
+static int hid_lgff_play(struct input_dev *dev, void *data,
+			 const struct mlnx_effect_command *command)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
-	int x, y;
-	unsigned int left, right;
 
-#define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
+	switch (command->cmd) {
+	case MLNX_START_COMBINED: {
+		const struct mlnx_simple_force *simple_force = &command->u.simple_force;
+		/* Scale down from MLNX range */
+		const int x = 0x80 - (simple_force->x * 0xff / 0xffff);
+		const int y = 0x80 - simple_force->y * 0xff / 0xffff;
 
-	switch (effect->type) {
-	case FF_CONSTANT:
-		x = effect->u.ramp.start_level + 0x7f;	/* 0x7f is center */
-		y = effect->u.ramp.end_level + 0x7f;
-		CLAMP(x);
-		CLAMP(y);
 		report->field[0]->value[0] = 0x51;
 		report->field[0]->value[1] = 0x08;
 		report->field[0]->value[2] = x;
 		report->field[0]->value[3] = y;
 		dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
-		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 		break;
+	}
+	case MLNX_STOP_COMBINED:
+		report->field[0]->value[0] = 0x51;
+		report->field[0]->value[1] = 0x08;
+		report->field[0]->value[2] = 0x80;
+		report->field[0]->value[3] = 0x80;
+		break;
+	case MLNX_START_RUMBLE: {
+		const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
+		/* Scale down from MLNX range */
+		const unsigned int right = rumble_force->weak * 0xff / 0xffff;
+		const unsigned int left = rumble_force->strong * 0xff / 0xffff;
 
-	case FF_RUMBLE:
-		right = effect->u.rumble.strong_magnitude;
-		left = effect->u.rumble.weak_magnitude;
-		right = right * 0xff / 0xffff;
-		left = left * 0xff / 0xffff;
-		CLAMP(left);
-		CLAMP(right);
 		report->field[0]->value[0] = 0x42;
 		report->field[0]->value[1] = 0x00;
 		report->field[0]->value[2] = left;
 		report->field[0]->value[3] = right;
 		dbg_hid("(left, right)=(%04x, %04x)\n", left, right);
-		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 		break;
 	}
+	case MLNX_STOP_RUMBLE:
+		report->field[0]->value[0] = 0x42;
+		report->field[0]->value[1] = 0x00;
+		report->field[0]->value[2] = 0;
+		report->field[0]->value[3] = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+
 	return 0;
 }
 
@@ -148,7 +178,7 @@ int lgff_init(struct hid_device* hid)
 	for (i = 0; ff_bits[i] >= 0; i++)
 		set_bit(ff_bits[i], dev->ffbit);
 
-	error = input_ff_create_memless(dev, NULL, hid_lgff_play);
+	error = input_ff_create_mlnx(dev, NULL, hid_lgff_play, FF_UPDATE_RATE);
 	if (error)
 		return error;
 
-- 
1.9.2

[PATCH v2 13/24] input: Port hid-lg3ff to ff-memless-next

[Michal Malý]

Port hid-lg3ff to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig     |  2 +-
 drivers/hid/hid-lg3ff.c | 60 +++++++++++++++++++++++++++++++------------------
 2 files changed, 39 insertions(+), 23 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index c7794ae..6f2941a 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -382,7 +382,7 @@ config LOGIRUMBLEPAD2_FF
 config LOGIG940_FF
 	bool "Logitech Flight System G940 force feedback support"
 	depends on HID_LOGITECH
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	help
 	  Say Y here if you want to enable force feedback support for Logitech
 	  Flight System G940 devices.
diff --git a/drivers/hid/hid-lg3ff.c b/drivers/hid/hid-lg3ff.c
index 8c2da18..c49b374 100644
--- a/drivers/hid/hid-lg3ff.c
+++ b/drivers/hid/hid-lg3ff.c
@@ -23,9 +23,12 @@
 
 #include <linux/input.h>
 #include <linux/hid.h>
+#include <linux/input/ff-memless-next.h>
 
 #include "hid-lg.h"
 
+#define FF_UPDATE_RATE 50
+
 /*
  * G940 Theory of Operation (from experimentation)
  *
@@ -58,12 +61,11 @@ struct lg3ff_device {
 };
 
 static int hid_lg3ff_play(struct input_dev *dev, void *data,
-			 struct ff_effect *effect)
+			 const struct mlnx_effect_command *command)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
-	int x, y;
 
 /*
  * Available values in the field should always be 63, but we only use up to
@@ -72,30 +74,37 @@ static int hid_lg3ff_play(struct input_dev *dev, void *data,
 	memset(report->field[0]->value, 0,
 	       sizeof(__s32) * report->field[0]->report_count);
 
-	switch (effect->type) {
-	case FF_CONSTANT:
-/*
- * Already clamped in ff_memless
- * 0 is center (different then other logitech)
- */
-		x = effect->u.ramp.start_level;
-		y = effect->u.ramp.end_level;
-
-		/* send command byte */
-		report->field[0]->value[0] = 0x51;
-
-/*
- * Sign backwards from other Force3d pro
- * which get recast here in two's complement 8 bits
- */
-		report->field[0]->value[1] = (unsigned char)(-x);
-		report->field[0]->value[31] = (unsigned char)(-y);
+	/* send command byte */
+	report->field[0]->value[0] = 0x51;
 
-		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+	switch (command->cmd) {
+	case MLNX_START_COMBINED: {
+		const struct mlnx_simple_force *simple_force = &command->u.simple_force;
+		/* Scale down from MLNX range */
+		const int x = simple_force->x * 0xff / 0xffff;
+		const int y = simple_force->y * 0xff / 0xffff;
+
+		/*
+		 * Sign backwards from other Force3d pro
+		 * which get recast here in two's complement 8 bits
+		*/
+		report->field[0]->value[1] = (unsigned char)x;
+		report->field[0]->value[31] = (unsigned char)y;
+		break;
+		}
+	case MLNX_STOP_COMBINED:
+		report->field[0]->value[1] = 0;
+		report->field[0]->value[31] = 0;
 		break;
+	default:
+		return -EINVAL;
 	}
+
+	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+
 	return 0;
 }
+
 static void hid_lg3ff_set_autocenter(struct input_dev *dev, u16 magnitude)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
@@ -123,6 +132,13 @@ static void hid_lg3ff_set_autocenter(struct input_dev *dev, u16 magnitude)
 
 static const signed short ff3_joystick_ac[] = {
 	FF_CONSTANT,
+	FF_RAMP,
+	FF_PERIODIC,
+	FF_SQUARE,
+	FF_TRIANGLE,
+	FF_SINE,
+	FF_SAW_UP,
+	FF_SAW_DOWN,
 	FF_AUTOCENTER,
 	-1
 };
@@ -143,7 +159,7 @@ int lg3ff_init(struct hid_device *hid)
 	for (i = 0; ff_bits[i] >= 0; i++)
 		set_bit(ff_bits[i], dev->ffbit);
 
-	error = input_ff_create_memless(dev, NULL, hid_lg3ff_play);
+	error = input_ff_create_mlnx(dev, NULL, hid_lg3ff_play, FF_UPDATE_RATE);
 	if (error)
 		return error;
 
-- 
1.9.2

[PATCH v2 14/24] input: Port hid-pl to ff-memless-next

[Michal Malý]

Port hid-pl to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig  |  2 +-
 drivers/hid/hid-pl.c | 38 ++++++++++++++++++++++++++------------
 2 files changed, 27 insertions(+), 13 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 6f2941a..87a02cc 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -500,7 +500,7 @@ config HID_PANTHERLORD
 config PANTHERLORD_FF
 	bool "Pantherlord force feedback support"
 	depends on HID_PANTHERLORD
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	---help---
 	  Say Y here if you have a PantherLord/GreenAsia based game controller
 	  or adapter and want to enable force feedback support for it.
diff --git a/drivers/hid/hid-pl.c b/drivers/hid/hid-pl.c
index 2dcd7d9..9b539d5 100644
--- a/drivers/hid/hid-pl.c
+++ b/drivers/hid/hid-pl.c
@@ -44,9 +44,12 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/hid.h>
+#include <linux/input/ff-memless-next.h>
 
 #include "hid-ids.h"
 
+#define FF_UPDATE_RATE 50
+
 #ifdef CONFIG_PANTHERLORD_FF
 
 struct plff_device {
@@ -57,24 +60,35 @@ struct plff_device {
 };
 
 static int hid_plff_play(struct input_dev *dev, void *data,
-			 struct ff_effect *effect)
+			 const struct mlnx_effect_command *command)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct plff_device *plff = data;
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
 	int left, right;
 
-	left = effect->u.rumble.strong_magnitude;
-	right = effect->u.rumble.weak_magnitude;
-	debug("called with 0x%04x 0x%04x", left, right);
-
-	left = left * plff->maxval / 0xffff;
-	right = right * plff->maxval / 0xffff;
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		left = rumble_force->strong;
+		right = rumble_force->weak;
+		debug("called with 0x%04x 0x%04x", left, right);
+
+		left = left * plff->maxval / 0xffff;
+		right = right * plff->maxval / 0xffff;
+
+		*plff->strong = left;
+		*plff->weak = right;
+		debug("running with 0x%02x 0x%02x", left, right);
+		break;
+	case MLNX_STOP_RUMBLE:
+		*plff->strong = 0;
+		*plff->weak = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
 
-	*plff->strong = left;
-	*plff->weak = right;
-	debug("running with 0x%02x 0x%02x", left, right);
 	hid_hw_request(hid, plff->report, HID_REQ_SET_REPORT);
-
 	return 0;
 }
 
@@ -160,7 +174,7 @@ static int plff_init(struct hid_device *hid)
 
 		set_bit(FF_RUMBLE, dev->ffbit);
 
-		error = input_ff_create_memless(dev, plff, hid_plff_play);
+		error = input_ff_create_mlnx(dev, plff, hid_plff_play, FF_UPDATE_RATE);
 		if (error) {
 			kfree(plff);
 			return error;
-- 
1.9.2

[PATCH v2 15/24] input: Port hid-sjoy to ff-memless-next

[Michal Malý]

Port hid-sjoy to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig    |  2 +-
 drivers/hid/hid-sjoy.c | 35 +++++++++++++++++++++++++----------
 2 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 87a02cc..e76c36a 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -681,7 +681,7 @@ config HID_SMARTJOYPLUS
 config SMARTJOYPLUS_FF
 	bool "SmartJoy PLUS PS2/USB adapter force feedback support"
 	depends on HID_SMARTJOYPLUS
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	---help---
 	Say Y here if you have a SmartJoy PLUS PS2/USB adapter and want to
 	enable force feedback support for it.
diff --git a/drivers/hid/hid-sjoy.c b/drivers/hid/hid-sjoy.c
index 37845ec..a6f8cfe 100644
--- a/drivers/hid/hid-sjoy.c
+++ b/drivers/hid/hid-sjoy.c
@@ -30,8 +30,11 @@
 #include <linux/slab.h>
 #include <linux/hid.h>
 #include <linux/module.h>
+#include <linux/input/ff-memless-next.h>
 #include "hid-ids.h"
 
+#define FF_UPDATE_RATE 50
+
 #ifdef CONFIG_SMARTJOYPLUS_FF
 
 struct sjoyff_device {
@@ -39,21 +42,33 @@ struct sjoyff_device {
 };
 
 static int hid_sjoyff_play(struct input_dev *dev, void *data,
-			 struct ff_effect *effect)
+			const struct mlnx_effect_command *command)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct sjoyff_device *sjoyff = data;
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
 	u32 left, right;
 
-	left = effect->u.rumble.strong_magnitude;
-	right = effect->u.rumble.weak_magnitude;
-	dev_dbg(&dev->dev, "called with 0x%08x 0x%08x\n", left, right);
-
-	left = left * 0xff / 0xffff;
-	right = (right != 0); /* on/off only */
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		left = rumble_force->strong;
+		right = rumble_force->weak;
+		dev_dbg(&dev->dev, "called with 0x%08x 0x%08x\n", left, right);
+
+		left = left * 0xff / 0xffff;
+		right = (right != 0); /* on/off only */
+
+		sjoyff->report->field[0]->value[1] = right;
+		sjoyff->report->field[0]->value[2] = left;
+		break;
+	case MLNX_STOP_RUMBLE:
+		left = 0;
+		right = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
 
-	sjoyff->report->field[0]->value[1] = right;
-	sjoyff->report->field[0]->value[2] = left;
 	dev_dbg(&dev->dev, "running with 0x%02x 0x%02x\n", left, right);
 	hid_hw_request(hid, sjoyff->report, HID_REQ_SET_REPORT);
 
@@ -103,7 +118,7 @@ static int sjoyff_init(struct hid_device *hid)
 
 		set_bit(FF_RUMBLE, dev->ffbit);
 
-		error = input_ff_create_memless(dev, sjoyff, hid_sjoyff_play);
+		error = input_ff_create_mlnx(dev, sjoyff, hid_sjoyff_play, FF_UPDATE_RATE);
 		if (error) {
 			kfree(sjoyff);
 			return error;
-- 
1.9.2

[PATCH v2 16/24] input: Port hid-sony to ff-memless-next

[Michal Malý]

Port hid-sony to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig    |  2 +-
 drivers/hid/hid-sony.c | 24 ++++++++++++++++++------
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index e76c36a..fc22f72 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -623,7 +623,7 @@ config HID_SONY
 config SONY_FF
 	bool "Sony PS2/3 accessories force feedback support"
 	depends on HID_SONY
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	---help---
 	Say Y here if you have a Sony PS2/3 accessory and want to enable force
 	feedback support for it.
diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
index 2f19b15..70a9cc5 100644
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -30,6 +30,7 @@
 #include <linux/slab.h>
 #include <linux/usb.h>
 #include <linux/leds.h>
+#include <linux/input/ff-memless-next.h>
 
 #include "hid-ids.h"
 
@@ -44,6 +45,7 @@
 #define SONY_LED_SUPPORT (SIXAXIS_CONTROLLER_USB | BUZZ_CONTROLLER | DUALSHOCK4_CONTROLLER_USB)
 #define SONY_FF_SUPPORT (SIXAXIS_CONTROLLER_USB | DUALSHOCK4_CONTROLLER_USB)
 
+#define FF_UPDATE_RATE 50
 #define MAX_LEDS 4
 
 static const u8 sixaxis_rdesc_fixup[] = {
@@ -970,16 +972,25 @@ static void dualshock4_state_worker(struct work_struct *work)
 
 #ifdef CONFIG_SONY_FF
 static int sony_play_effect(struct input_dev *dev, void *data,
-			    struct ff_effect *effect)
+			    const struct mlnx_effect_command *command)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct sony_sc *sc = hid_get_drvdata(hid);
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
 
-	if (effect->type != FF_RUMBLE)
-		return 0;
 
-	sc->left = effect->u.rumble.strong_magnitude / 256;
-	sc->right = effect->u.rumble.weak_magnitude / 256;
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		sc->left = rumble_force->strong / 256;
+		sc->right = rumble_force->weak / 256;
+		break;
+	case MLNX_STOP_RUMBLE:
+		sc->left = 0;
+		sc->right = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	schedule_work(&sc->state_worker);
 	return 0;
@@ -992,7 +1003,7 @@ static int sony_init_ff(struct hid_device *hdev)
 	struct input_dev *input_dev = hidinput->input;
 
 	input_set_capability(input_dev, EV_FF, FF_RUMBLE);
-	return input_ff_create_memless(input_dev, NULL, sony_play_effect);
+	return input_ff_create_mlnx(input_dev, NULL, sony_play_effect, FF_UPDATE_RATE);
 }
 
 #else
@@ -1150,6 +1161,7 @@ static const struct hid_device_id sony_devices[] = {
 		.driver_data = DUALSHOCK4_CONTROLLER_USB },
 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER),
 		.driver_data = DUALSHOCK4_CONTROLLER_BT },
+
 	{ }
 };
 MODULE_DEVICE_TABLE(hid, sony_devices);
-- 
1.9.2

[PATCH v2 17/24] input: Port hid-tmff to ff-memless-next

[Michal Malý]

Port hid-tmff to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig    |  2 +-
 drivers/hid/hid-tmff.c | 83 ++++++++++++++++++++++++++++++--------------------
 2 files changed, 51 insertions(+), 34 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index fc22f72..ee999bc 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -719,7 +719,7 @@ config HID_THRUSTMASTER
 config THRUSTMASTER_FF
 	bool "ThrustMaster devices force feedback support"
 	depends on HID_THRUSTMASTER
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	---help---
 	  Say Y here if you have a THRUSTMASTER FireStore Dual Power 2 or 3,
 	  a THRUSTMASTER Dual Trigger 3-in-1 or a THRUSTMASTER Ferrari GT
diff --git a/drivers/hid/hid-tmff.c b/drivers/hid/hid-tmff.c
index b833760..3df000c 100644
--- a/drivers/hid/hid-tmff.c
+++ b/drivers/hid/hid-tmff.c
@@ -31,9 +31,12 @@
 #include <linux/input.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/input/ff-memless-next.h>
 
 #include "hid-ids.h"
 
+#define FF_UPDATE_RATE 50
+
 static const signed short ff_rumble[] = {
 	FF_RUMBLE,
 	-1
@@ -41,6 +44,13 @@ static const signed short ff_rumble[] = {
 
 static const signed short ff_joystick[] = {
 	FF_CONSTANT,
+	FF_RAMP,
+	FF_PERIODIC,
+	FF_SINE,
+	FF_SQUARE,
+	FF_TRIANGLE,
+	FF_SAW_DOWN,
+	FF_SAW_UP,
 	-1
 };
 
@@ -67,12 +77,12 @@ static inline int tmff_scale_u16(unsigned int in, int minimum, int maximum)
 	return ret;
 }
 
-/* Changes values from -0x80 to 0x7f into values from minimum to maximum */
-static inline int tmff_scale_s8(int in, int minimum, int maximum)
+/* Changes values from -0x7fff to 0x7fff into values from minimum to maximum */
+static inline int tmff_scale_s32(int in, int minimum, int maximum)
 {
 	int ret;
 
-	ret = (((in + 0x80) * (maximum - minimum)) / 0xff) + minimum;
+	ret = (((in + 0x7fff) * (maximum - minimum)) / 0xffff) + minimum;
 	if (ret < minimum)
 		return minimum;
 	if (ret > maximum)
@@ -81,43 +91,50 @@ static inline int tmff_scale_s8(int in, int minimum, int maximum)
 }
 
 static int tmff_play(struct input_dev *dev, void *data,
-		struct ff_effect *effect)
+		const struct mlnx_effect_command *command)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct tmff_device *tmff = data;
 	struct hid_field *ff_field = tmff->ff_field;
 	int x, y;
-	int left, right;	/* Rumbling */
-
-	switch (effect->type) {
-	case FF_CONSTANT:
-		x = tmff_scale_s8(effect->u.ramp.start_level,
-					ff_field->logical_minimum,
-					ff_field->logical_maximum);
-		y = tmff_scale_s8(effect->u.ramp.end_level,
-					ff_field->logical_minimum,
-					ff_field->logical_maximum);
-
-		dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
-		ff_field->value[0] = x;
-		ff_field->value[1] = y;
-		hid_hw_request(hid, tmff->report, HID_REQ_SET_REPORT);
-		break;
 
-	case FF_RUMBLE:
-		left = tmff_scale_u16(effect->u.rumble.weak_magnitude,
-					ff_field->logical_minimum,
-					ff_field->logical_maximum);
-		right = tmff_scale_u16(effect->u.rumble.strong_magnitude,
-					ff_field->logical_minimum,
-					ff_field->logical_maximum);
-
-		dbg_hid("(left,right)=(%08x, %08x)\n", left, right);
-		ff_field->value[0] = left;
-		ff_field->value[1] = right;
-		hid_hw_request(hid, tmff->report, HID_REQ_SET_REPORT);
+	switch (command->cmd) {
+	case MLNX_START_COMBINED: {
+		const struct mlnx_simple_force *sf = &command->u.simple_force;
+		x = tmff_scale_s32(sf->x,
+				   ff_field->logical_minimum,
+				   ff_field->logical_maximum);
+		y = tmff_scale_s32(sf->y,
+				   ff_field->logical_minimum,
+				   ff_field->logical_maximum);
+		break;
+		}
+	case MLNX_STOP_COMBINED:
+		x = 0;
+		y = 0;
+		break;
+	case MLNX_START_RUMBLE: {
+		const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
+		x = tmff_scale_u16(rumble_force->weak,
+				   ff_field->logical_minimum,
+				   ff_field->logical_maximum);
+		y = tmff_scale_u16(rumble_force->strong,
+				   ff_field->logical_minimum,
+				   ff_field->logical_maximum);
 		break;
+		}
+	case MLNX_STOP_RUMBLE:
+		x = 0;
+		y = 0;
+		break;
+	default:
+		return -EINVAL;
 	}
+
+	ff_field->value[0] = x;
+	ff_field->value[1] = y;
+
+	hid_hw_request(hid, tmff->report, HID_REQ_SET_REPORT);
 	return 0;
 }
 
@@ -192,7 +209,7 @@ static int tmff_init(struct hid_device *hid, const signed short *ff_bits)
 		goto fail;
 	}
 
-	error = input_ff_create_memless(input_dev, tmff, tmff_play);
+	error = input_ff_create_mlnx(input_dev, tmff, tmff_play, FF_UPDATE_RATE);
 	if (error)
 		goto fail;
 
-- 
1.9.2

[PATCH v2 18/24] input: Port hid-wiimote-modules to ff-memless-next

[Michal Malý]

Port hid-wiimote-modules to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig               |  2 +-
 drivers/hid/hid-wiimote-modules.c | 74 ++++++++++++++++++++++++---------------
 2 files changed, 46 insertions(+), 30 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index ee999bc..d1cbad6 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -738,7 +738,7 @@ config HID_WIIMOTE
 	depends on HID
 	depends on LEDS_CLASS
 	select POWER_SUPPLY
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	---help---
 	Support for Nintendo Wii and Wii U Bluetooth peripherals. Supported
 	devices are the Wii Remote and its extension devices, but also devices
diff --git a/drivers/hid/hid-wiimote-modules.c b/drivers/hid/hid-wiimote-modules.c
index 6b61f01..95b20ea 100644
--- a/drivers/hid/hid-wiimote-modules.c
+++ b/drivers/hid/hid-wiimote-modules.c
@@ -37,8 +37,11 @@
 #include <linux/hid.h>
 #include <linux/input.h>
 #include <linux/spinlock.h>
+#include <linux/input/ff-memless-next.h>
 #include "hid-wiimote.h"
 
+#define FF_UPDATE_RATE 50
+
 /*
  * Keys
  * The initial Wii Remote provided a bunch of buttons that are reported as
@@ -131,21 +134,27 @@ static void wiimod_rumble_worker(struct work_struct *work)
 }
 
 static int wiimod_rumble_play(struct input_dev *dev, void *data,
-			      struct ff_effect *eff)
+			      const struct mlnx_effect_command *command)
 {
 	struct wiimote_data *wdata = input_get_drvdata(dev);
-	__u8 value;
-
-	/*
-	 * The wiimote supports only a single rumble motor so if any magnitude
-	 * is set to non-zero then we start the rumble motor. If both are set to
-	 * zero, we stop the rumble motor.
-	 */
-
-	if (eff->u.rumble.strong_magnitude || eff->u.rumble.weak_magnitude)
-		value = 1;
-	else
-		value = 0;
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
+	__u8 value = 0;
+
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		/*
+		 * The wiimote supports only a single rumble motor so if any magnitude
+		 * is set to non-zero then we start the rumble motor. If both are set to
+		 * zero, we stop the rumble motor.
+		 */
+		if (rumble_force->strong || rumble_force->weak)
+			value = 1;
+		break;
+	case MLNX_STOP_RUMBLE:
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	/* Locking state.lock here might deadlock with input_event() calls.
 	 * schedule_work acts as barrier. Merging multiple changes is fine. */
@@ -161,7 +170,7 @@ static int wiimod_rumble_probe(const struct wiimod_ops *ops,
 	INIT_WORK(&wdata->rumble_worker, wiimod_rumble_worker);
 
 	set_bit(FF_RUMBLE, wdata->input->ffbit);
-	if (input_ff_create_memless(wdata->input, NULL, wiimod_rumble_play))
+	if (input_ff_create_mlnx(wdata->input, NULL, wiimod_rumble_play, FF_UPDATE_RATE))
 		return -ENOMEM;
 
 	return 0;
@@ -1771,21 +1780,28 @@ static void wiimod_pro_close(struct input_dev *dev)
 }
 
 static int wiimod_pro_play(struct input_dev *dev, void *data,
-			   struct ff_effect *eff)
+			   const struct mlnx_effect_command *command)
 {
 	struct wiimote_data *wdata = input_get_drvdata(dev);
-	__u8 value;
-
-	/*
-	 * The wiimote supports only a single rumble motor so if any magnitude
-	 * is set to non-zero then we start the rumble motor. If both are set to
-	 * zero, we stop the rumble motor.
-	 */
-
-	if (eff->u.rumble.strong_magnitude || eff->u.rumble.weak_magnitude)
-		value = 1;
-	else
-		value = 0;
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
+	__u8 value = 0;
+
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		/*
+		 * The wiimote supports only a single rumble motor so if any magnitude
+		 * is set to non-zero then we start the rumble motor. If both are set to
+		 * zero, we stop the rumble motor.
+		 */
+
+		if (rumble_force->strong || rumble_force->weak)
+			value = 1;
+		break;
+	case MLNX_STOP_RUMBLE:
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	/* Locking state.lock here might deadlock with input_event() calls.
 	 * schedule_work acts as barrier. Merging multiple changes is fine. */
@@ -1867,8 +1883,8 @@ static int wiimod_pro_probe(const struct wiimod_ops *ops,
 	set_bit(FF_RUMBLE, wdata->extension.input->ffbit);
 	input_set_drvdata(wdata->extension.input, wdata);
 
-	if (input_ff_create_memless(wdata->extension.input, NULL,
-				    wiimod_pro_play)) {
+	if (input_ff_create_mlnx(wdata->extension.input, NULL,
+				 wiimod_pro_play, FF_UPDATE_RATE)) {
 		ret = -ENOMEM;
 		goto err_free;
 	}
-- 
1.9.2

[PATCH v2 19/24] input: Port hid-zpff to ff-memless-next

[Michal Malý]

Port hid-zpff to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig    |  2 +-
 drivers/hid/hid-zpff.c | 30 ++++++++++++++++++++++--------
 2 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index d1cbad6..7d617a8 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -775,7 +775,7 @@ config HID_ZEROPLUS
 config ZEROPLUS_FF
 	bool "Zeroplus based game controller force feedback support"
 	depends on HID_ZEROPLUS
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	---help---
 	  Say Y here if you have a Zeroplus based game controller and want
 	  to have force feedback support for it.
diff --git a/drivers/hid/hid-zpff.c b/drivers/hid/hid-zpff.c
index a29756c..6912500 100644
--- a/drivers/hid/hid-zpff.c
+++ b/drivers/hid/hid-zpff.c
@@ -25,9 +25,12 @@
 #include <linux/input.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/input/ff-memless-next.h>
 
 #include "hid-ids.h"
 
+#define FF_UPDATE_RATE 50
+
 #ifdef CONFIG_ZEROPLUS_FF
 
 struct zpff_device {
@@ -35,10 +38,11 @@ struct zpff_device {
 };
 
 static int zpff_play(struct input_dev *dev, void *data,
-			 struct ff_effect *effect)
+			 const struct mlnx_effect_command *command)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct zpff_device *zpff = data;
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
 	int left, right;
 
 	/*
@@ -47,12 +51,22 @@ static int zpff_play(struct input_dev *dev, void *data,
 	 * however it is possible that the XFX Executioner is an exception
 	 */
 
-	left = effect->u.rumble.strong_magnitude;
-	right = effect->u.rumble.weak_magnitude;
-	dbg_hid("called with 0x%04x 0x%04x\n", left, right);
-
-	left = left * 0x7f / 0xffff;
-	right = right * 0x7f / 0xffff;
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		left = rumble_force->strong;
+		right = rumble_force->weak;
+		dbg_hid("called with 0x%04x 0x%04x\n", left, right);
+
+		left = left * 0x7f / 0xffff;
+		right = right * 0x7f / 0xffff;
+		break;
+	case MLNX_STOP_RUMBLE:
+		left = 0;
+		right = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	zpff->report->field[2]->value[0] = left;
 	zpff->report->field[3]->value[0] = right;
@@ -83,7 +97,7 @@ static int zpff_init(struct hid_device *hid)
 
 	set_bit(FF_RUMBLE, dev->ffbit);
 
-	error = input_ff_create_memless(dev, zpff, zpff_play);
+	error = input_ff_create_mlnx(dev, zpff, zpff_play, FF_UPDATE_RATE);
 	if (error) {
 		kfree(zpff);
 		return error;
-- 
1.9.2

[PATCH v2 20/24] input: Port gamecon to ff-memless-next

[Michal Malý]

Port gamecon to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/input/joystick/Kconfig   |  2 +-
 drivers/input/joystick/gamecon.c | 57 ++++++++++++++++++++++------------------
 2 files changed, 33 insertions(+), 26 deletions(-)

diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
index 56eb471..2dd3ba1 100644
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -221,7 +221,7 @@ config JOYSTICK_DB9
 config JOYSTICK_GAMECON
 	tristate "Multisystem, NES, SNES, N64, PSX joysticks and gamepads"
 	depends on PARPORT
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	---help---
 	  Say Y here if you have a Nintendo Entertainment System gamepad,
 	  Super Nintendo Entertainment System gamepad, Nintendo 64 gamepad,
diff --git a/drivers/input/joystick/gamecon.c b/drivers/input/joystick/gamecon.c
index e68e497..209d0fb 100644
--- a/drivers/input/joystick/gamecon.c
+++ b/drivers/input/joystick/gamecon.c
@@ -40,6 +40,7 @@
 #include <linux/input.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
+#include <linux/input/ff-memless-next.h>
 
 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 MODULE_DESCRIPTION("NES, SNES, N64, MultiSystem, PSX gamepad driver");
@@ -47,6 +48,7 @@ MODULE_LICENSE("GPL");
 
 #define GC_MAX_PORTS		3
 #define GC_MAX_DEVICES		5
+#define FF_UPDATE_RATE 50
 
 struct gc_config {
 	int args[GC_MAX_DEVICES + 1];
@@ -263,43 +265,48 @@ static void gc_n64_process_packet(struct gc *gc)
 }
 
 static int gc_n64_play_effect(struct input_dev *dev, void *data,
-			      struct ff_effect *effect)
+			      const struct mlnx_effect_command *command)
 {
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
 	int i;
 	unsigned long flags;
 	struct gc *gc = input_get_drvdata(dev);
 	struct gc_subdev *sdev = data;
 	unsigned char target = 1 << sdev->idx; /* select desired pin */
+	unsigned int cmd;
 
-	if (effect->type == FF_RUMBLE) {
-		struct ff_rumble_effect *rumble = &effect->u.rumble;
-		unsigned int cmd =
-			rumble->strong_magnitude || rumble->weak_magnitude ?
-			GC_N64_CMD_01 : GC_N64_CMD_00;
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		cmd = (rumble_force->strong || rumble_force->weak) ? GC_N64_CMD_01 : GC_N64_CMD_00;
+		break;
+	case MLNX_STOP_RUMBLE:
+		cmd = GC_N64_CMD_00;
+		break;
+	default:
+		return -EINVAL;
+	}
 
-		local_irq_save(flags);
+	local_irq_save(flags);
 
-		/* Init Rumble - 0x03, 0x80, 0x01, (34)0x80 */
-		gc_n64_send_command(gc, GC_N64_CMD_03, target);
+	/* Init Rumble - 0x03, 0x80, 0x01, (34)0x80 */
+	gc_n64_send_command(gc, GC_N64_CMD_03, target);
+	gc_n64_send_command(gc, GC_N64_CMD_80, target);
+	gc_n64_send_command(gc, GC_N64_CMD_01, target);
+	for (i = 0; i < 32; i++)
 		gc_n64_send_command(gc, GC_N64_CMD_80, target);
-		gc_n64_send_command(gc, GC_N64_CMD_01, target);
-		for (i = 0; i < 32; i++)
-			gc_n64_send_command(gc, GC_N64_CMD_80, target);
-		gc_n64_send_stop_bit(gc, target);
+	gc_n64_send_stop_bit(gc, target);
 
-		udelay(GC_N64_DELAY);
-
-		/* Now start or stop it - 0x03, 0xc0, 0zx1b, (32)0x01/0x00 */
-		gc_n64_send_command(gc, GC_N64_CMD_03, target);
-		gc_n64_send_command(gc, GC_N64_CMD_c0, target);
-		gc_n64_send_command(gc, GC_N64_CMD_1b, target);
-		for (i = 0; i < 32; i++)
-			gc_n64_send_command(gc, cmd, target);
-		gc_n64_send_stop_bit(gc, target);
+	udelay(GC_N64_DELAY);
 
-		local_irq_restore(flags);
+	/* Now start or stop it - 0x03, 0xc0, 0zx1b, (32)0x01/0x00 */
+	gc_n64_send_command(gc, GC_N64_CMD_03, target);
+	gc_n64_send_command(gc, GC_N64_CMD_c0, target);
+	gc_n64_send_command(gc, GC_N64_CMD_1b, target);
+	for (i = 0; i < 32; i++)
+		gc_n64_send_command(gc, cmd, target);
+	gc_n64_send_stop_bit(gc, target);
 
-	}
+	local_irq_restore(flags);
 
 	return 0;
 }
@@ -317,7 +324,7 @@ static int __init gc_n64_init_ff(struct input_dev *dev, int i)
 
 	input_set_capability(dev, EV_FF, FF_RUMBLE);
 
-	err = input_ff_create_memless(dev, sdev, gc_n64_play_effect);
+	err = input_ff_create_mlnx(dev, sdev, gc_n64_play_effect, FF_UPDATE_RATE);
 	if (err) {
 		kfree(sdev);
 		return err;
-- 
1.9.2

[PATCH v2 21/24] input: Port xpad to ff-memless-next

[Michal Malý]

Port xpad to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/input/joystick/Kconfig |   2 +-
 drivers/input/joystick/xpad.c  | 125 +++++++++++++++++++++++------------------
 2 files changed, 71 insertions(+), 56 deletions(-)

diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
index 2dd3ba1..9f26e48 100644
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -294,7 +294,7 @@ config JOYSTICK_XPAD
 config JOYSTICK_XPAD_FF
 	bool "X-Box gamepad rumble support"
 	depends on JOYSTICK_XPAD && INPUT
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	---help---
 	  Say Y here if you want to take advantage of xbox 360 rumble features.
 
diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
index 603fe0d..5d9c8a2 100644
--- a/drivers/input/joystick/xpad.c
+++ b/drivers/input/joystick/xpad.c
@@ -78,6 +78,7 @@
 #include <linux/stat.h>
 #include <linux/module.h>
 #include <linux/usb/input.h>
+#include <linux/input/ff-memless-next.h>
 
 #define DRIVER_AUTHOR "Marko Friedemann <mfr@bmx-chemnitz.de>"
 #define DRIVER_DESC "X-Box pad driver"
@@ -97,6 +98,8 @@
 #define XTYPE_XBOX360W    2
 #define XTYPE_UNKNOWN     3
 
+#define FF_UPDATE_RATE 50
+
 static bool dpad_to_buttons;
 module_param(dpad_to_buttons, bool, S_IRUGO);
 MODULE_PARM_DESC(dpad_to_buttons, "Map D-PAD to buttons rather than axes for unknown pads");
@@ -628,63 +631,75 @@ static void xpad_stop_output(struct usb_xpad *xpad) {}
 #endif
 
 #ifdef CONFIG_JOYSTICK_XPAD_FF
-static int xpad_play_effect(struct input_dev *dev, void *data, struct ff_effect *effect)
+static int xpad_play_effect(struct input_dev *dev, void *data,
+			    const struct mlnx_effect_command *command)
 {
 	struct usb_xpad *xpad = input_get_drvdata(dev);
+	const struct mlnx_rumble_force *rumble_force = &command->u.rumble_force;
+	__u16 strong, weak;
 
-	if (effect->type == FF_RUMBLE) {
-		__u16 strong = effect->u.rumble.strong_magnitude;
-		__u16 weak = effect->u.rumble.weak_magnitude;
-
-		switch (xpad->xtype) {
-
-		case XTYPE_XBOX:
-			xpad->odata[0] = 0x00;
-			xpad->odata[1] = 0x06;
-			xpad->odata[2] = 0x00;
-			xpad->odata[3] = strong / 256;	/* left actuator */
-			xpad->odata[4] = 0x00;
-			xpad->odata[5] = weak / 256;	/* right actuator */
-			xpad->irq_out->transfer_buffer_length = 6;
-
-			return usb_submit_urb(xpad->irq_out, GFP_ATOMIC);
-
-		case XTYPE_XBOX360:
-			xpad->odata[0] = 0x00;
-			xpad->odata[1] = 0x08;
-			xpad->odata[2] = 0x00;
-			xpad->odata[3] = strong / 256;  /* left actuator? */
-			xpad->odata[4] = weak / 256;	/* right actuator? */
-			xpad->odata[5] = 0x00;
-			xpad->odata[6] = 0x00;
-			xpad->odata[7] = 0x00;
-			xpad->irq_out->transfer_buffer_length = 8;
-
-			return usb_submit_urb(xpad->irq_out, GFP_ATOMIC);
-
-		case XTYPE_XBOX360W:
-			xpad->odata[0] = 0x00;
-			xpad->odata[1] = 0x01;
-			xpad->odata[2] = 0x0F;
-			xpad->odata[3] = 0xC0;
-			xpad->odata[4] = 0x00;
-			xpad->odata[5] = strong / 256;
-			xpad->odata[6] = weak / 256;
-			xpad->odata[7] = 0x00;
-			xpad->odata[8] = 0x00;
-			xpad->odata[9] = 0x00;
-			xpad->odata[10] = 0x00;
-			xpad->odata[11] = 0x00;
-			xpad->irq_out->transfer_buffer_length = 12;
-
-			return usb_submit_urb(xpad->irq_out, GFP_ATOMIC);
-
-		default:
-			dev_dbg(&xpad->dev->dev,
-				"%s - rumble command sent to unsupported xpad type: %d\n",
-				__func__, xpad->xtype);
-			return -1;
-		}
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		strong = rumble_force->strong;
+		weak = rumble_force->weak;
+		break;
+	case MLNX_STOP_RUMBLE:
+		strong = 0;
+		weak = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+
+	switch (xpad->xtype) {
+
+	case XTYPE_XBOX:
+		xpad->odata[0] = 0x00;
+		xpad->odata[1] = 0x06;
+		xpad->odata[2] = 0x00;
+		xpad->odata[3] = strong / 256;	/* left actuator */
+		xpad->odata[4] = 0x00;
+		xpad->odata[5] = weak / 256;	/* right actuator */
+		xpad->irq_out->transfer_buffer_length = 6;
+
+		return usb_submit_urb(xpad->irq_out, GFP_ATOMIC);
+
+	case XTYPE_XBOX360:
+		xpad->odata[0] = 0x00;
+		xpad->odata[1] = 0x08;
+		xpad->odata[2] = 0x00;
+		xpad->odata[3] = strong / 256;  /* left actuator? */
+		xpad->odata[4] = weak / 256;	/* right actuator? */
+		xpad->odata[5] = 0x00;
+		xpad->odata[6] = 0x00;
+		xpad->odata[7] = 0x00;
+		xpad->irq_out->transfer_buffer_length = 8;
+
+		return usb_submit_urb(xpad->irq_out, GFP_ATOMIC);
+
+	case XTYPE_XBOX360W:
+		xpad->odata[0] = 0x00;
+		xpad->odata[1] = 0x01;
+		xpad->odata[2] = 0x0F;
+		xpad->odata[3] = 0xC0;
+		xpad->odata[4] = 0x00;
+		xpad->odata[5] = strong / 256;
+		xpad->odata[6] = weak / 256;
+		xpad->odata[7] = 0x00;
+		xpad->odata[8] = 0x00;
+		xpad->odata[9] = 0x00;
+		xpad->odata[10] = 0x00;
+		xpad->odata[11] = 0x00;
+		xpad->irq_out->transfer_buffer_length = 12;
+
+		return usb_submit_urb(xpad->irq_out, GFP_ATOMIC);
+
+	default:
+		dev_dbg(&xpad->dev->dev,
+			"%s - rumble command sent to unsupported xpad type: %d\n",
+			__func__, xpad->xtype);
+		return -1;
 	}
 
 	return 0;
@@ -697,7 +712,7 @@ static int xpad_init_ff(struct usb_xpad *xpad)
 
 	input_set_capability(xpad->dev, EV_FF, FF_RUMBLE);
 
-	return input_ff_create_memless(xpad->dev, NULL, xpad_play_effect);
+	return input_ff_create_mlnx(xpad->dev, NULL, xpad_play_effect, FF_UPDATE_RATE);
 }
 
 #else
-- 
1.9.2

[PATCH v2 22/24] input: Port hid-lg2ff to ff-memless-next

[Michal Malý]

* Port hid-lg2ff to ff-memless-next
* Clamp vibration magnitude to range <0x02; 0xfd> to prevent irregular shaking of the vibration motors.

Signed-off-by: Elias Vanderstuyft <elias.vds@gmail.com>
---
 drivers/hid/Kconfig     |  2 +-
 drivers/hid/hid-lg2ff.c | 65 ++++++++++++++++++++++++++++++++++---------------
 2 files changed, 47 insertions(+), 20 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 7d617a8..8889b7a 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -372,7 +372,7 @@ config LOGITECH_FF
 config LOGIRUMBLEPAD2_FF
 	bool "Logitech force feedback support (variant 2)"
 	depends on HID_LOGITECH
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	help
 	  Say Y here if you want to enable force feedback support for:
 	  - Logitech RumblePad
diff --git a/drivers/hid/hid-lg2ff.c b/drivers/hid/hid-lg2ff.c
index 0e3fb1a..6ab5327 100644
--- a/drivers/hid/hid-lg2ff.c
+++ b/drivers/hid/hid-lg2ff.c
@@ -22,42 +22,69 @@
 
 
 #include <linux/input.h>
+#include <linux/input/ff-memless-next.h>
 #include <linux/slab.h>
 #include <linux/hid.h>
 
 #include "hid-lg.h"
 
+#define FF_UPDATE_RATE 8
+
 struct lg2ff_device {
 	struct hid_report *report;
 };
 
-static int play_effect(struct input_dev *dev, void *data,
-			 struct ff_effect *effect)
+static int hid_lg2ff_start_rumble(struct hid_device *hid, struct hid_report *report,
+				const struct mlnx_rumble_force *rumble)
 {
-	struct hid_device *hid = input_get_drvdata(dev);
-	struct lg2ff_device *lg2ff = data;
 	int weak, strong;
 
-	strong = effect->u.rumble.strong_magnitude;
-	weak = effect->u.rumble.weak_magnitude;
+#define CLAMP_QUIRK(x) do { if (x < 2) x = 2; else if (x > 0xfd) x = 0xfd; } \
+			while (0)
 
-	if (weak || strong) {
-		weak = weak * 0xff / 0xffff;
-		strong = strong * 0xff / 0xffff;
+	/* Scale down from MLNX range */
+	strong = rumble->strong * 0xff / 0xffff;
+	weak = rumble->weak * 0xff / 0xffff;
+	CLAMP_QUIRK(weak);
+	CLAMP_QUIRK(strong);
 
-		lg2ff->report->field[0]->value[0] = 0x51;
-		lg2ff->report->field[0]->value[2] = weak;
-		lg2ff->report->field[0]->value[4] = strong;
-	} else {
-		lg2ff->report->field[0]->value[0] = 0xf3;
-		lg2ff->report->field[0]->value[2] = 0x00;
-		lg2ff->report->field[0]->value[4] = 0x00;
-	}
+	report->field[0]->value[0] = 0x51;
+	report->field[0]->value[2] = weak;
+	report->field[0]->value[4] = strong;
 
-	hid_hw_request(hid, lg2ff->report, HID_REQ_SET_REPORT);
+	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 	return 0;
 }
 
+static int hid_lg2ff_stop_rumble(struct hid_device *hid, struct hid_report *report)
+{
+	report->field[0]->value[0] = 0xf3;
+	report->field[0]->value[2] = 0x00;
+	report->field[0]->value[4] = 0x00;
+
+	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+	return 0;
+}
+
+static int hid_lg2ff_control(struct input_dev *dev, void *data,
+				const struct mlnx_effect_command *command)
+{
+	struct hid_device *hid = input_get_drvdata(dev);
+	struct lg2ff_device *lg2ff = data;
+
+	switch (command->cmd) {
+	case MLNX_START_RUMBLE:
+		return hid_lg2ff_start_rumble(hid, lg2ff->report, &command->u.rumble_force);
+		break;
+	case MLNX_STOP_RUMBLE:
+		return hid_lg2ff_stop_rumble(hid, lg2ff->report);
+		break;
+	default:
+		dbg_hid("Unsupported effect command");
+		return -EINVAL;
+	}
+}
+
 int lg2ff_init(struct hid_device *hid)
 {
 	struct lg2ff_device *lg2ff;
@@ -78,7 +105,7 @@ int lg2ff_init(struct hid_device *hid)
 
 	set_bit(FF_RUMBLE, dev->ffbit);
 
-	error = input_ff_create_memless(dev, lg2ff, play_effect);
+	error = input_ff_create_mlnx(dev, lg2ff, hid_lg2ff_control, FF_UPDATE_RATE);
 	if (error) {
 		kfree(lg2ff);
 		return error;
-- 
1.9.2

[PATCH v2 23/24] input: Port hid-lg4ff to ff-memless-next

[Michal Malý]

Port hid-lg4ff to ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/hid/Kconfig     |  2 +-
 drivers/hid/hid-lg4ff.c | 93 ++++++++++++++++++++++++++++++-------------------
 2 files changed, 59 insertions(+), 36 deletions(-)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 8889b7a..5e6aa8e 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -390,7 +390,7 @@ config LOGIG940_FF
 config LOGIWHEELS_FF
 	bool "Logitech wheels configuration and force feedback support"
 	depends on HID_LOGITECH
-	select INPUT_FF_MEMLESS
+	select INPUT_FF_MEMLESS_NEXT
 	default LOGITECH_FF
 	help
 	  Say Y here if you want to enable force feedback and range setting
diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index 24883b4..d629093 100644
--- a/drivers/hid/hid-lg4ff.c
+++ b/drivers/hid/hid-lg4ff.c
@@ -25,6 +25,7 @@
 
 
 #include <linux/input.h>
+#include <linux/input/ff-memless-next.h>
 #include <linux/usb.h>
 #include <linux/hid.h>
 
@@ -45,6 +46,8 @@
 #define G27_REV_MIN 0x38
 #define G27_2_REV_MIN 0x39
 
+#define FF_UPDATE_RATE 8
+
 #define to_hid_device(pdev) container_of(pdev, struct hid_device, dev)
 
 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
@@ -69,6 +72,13 @@ struct lg4ff_device_entry {
 
 static const signed short lg4ff_wheel_effects[] = {
 	FF_CONSTANT,
+	FF_RAMP,
+	FF_PERIODIC,
+	FF_SQUARE,
+	FF_TRIANGLE,
+	FF_SINE,
+	FF_SAW_UP,
+	FF_SAW_DOWN,
 	FF_AUTOCENTER,
 	-1
 };
@@ -184,47 +194,60 @@ int lg4ff_adjust_input_event(struct hid_device *hid, struct hid_field *field,
 	}
 }
 
-static int hid_lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
+static int hid_lg4ff_start_combined(struct hid_device *hid, struct hid_report *report,
+				    const struct mlnx_simple_force *force)
+{
+	__s32 *value = report->field[0]->value;
+	int scaled_x;
+
+	/* Scale down from MLNX range */
+	scaled_x = 0x80 - (force->x * 0xff / 0xffff);
+
+	value[0] = 0x11;	/* Slot 1 */
+	value[1] = 0x08;
+	value[2] = scaled_x;
+	value[3] = 0x80;
+	value[4] = 0x00;
+	value[5] = 0x00;
+	value[6] = 0x00;
+
+	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+	return 0;
+}
+
+static int hid_lg4ff_stop_combined(struct hid_device *hid, struct hid_report *report)
+{
+	__s32 *value = report->field[0]->value;
+
+	value[0] = 0x13;	/* Slot 1 */
+	value[1] = 0x00;
+	value[2] = 0x00;
+	value[3] = 0x00;
+	value[4] = 0x00;
+	value[5] = 0x00;
+	value[6] = 0x00;
+
+	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+	return 0;
+}
+
+static int hid_lg4ff_control(struct input_dev *dev, void *data, const struct mlnx_effect_command *command)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
-	__s32 *value = report->field[0]->value;
-	int x;
-
-#define CLAMP(x) do { if (x < 0) x = 0; else if (x > 0xff) x = 0xff; } while (0)
-
-	switch (effect->type) {
-	case FF_CONSTANT:
-		x = effect->u.ramp.start_level + 0x80;	/* 0x80 is no force */
-		CLAMP(x);
-
-		if (x == 0x80) {
-			/* De-activate force in slot-1*/
-			value[0] = 0x13;
-			value[1] = 0x00;
-			value[2] = 0x00;
-			value[3] = 0x00;
-			value[4] = 0x00;
-			value[5] = 0x00;
-			value[6] = 0x00;
-
-			hid_hw_request(hid, report, HID_REQ_SET_REPORT);
-			return 0;
-		}
-
-		value[0] = 0x11;	/* Slot 1 */
-		value[1] = 0x08;
-		value[2] = x;
-		value[3] = 0x80;
-		value[4] = 0x00;
-		value[5] = 0x00;
-		value[6] = 0x00;
 
-		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+	switch (command->cmd) {
+	case MLNX_START_COMBINED:
+		return hid_lg4ff_start_combined(hid, report, &command->u.simple_force);
+		break;
+	case MLNX_STOP_COMBINED:
+		return hid_lg4ff_stop_combined(hid, report);
 		break;
+	default:
+		dbg_hid("Unsupported effect command");
+		return -EINVAL;
 	}
-	return 0;
 }
 
 /* Sends default autocentering command compatible with
@@ -610,7 +633,7 @@ int lg4ff_init(struct hid_device *hid)
 	for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
 		set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);
 
-	error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);
+	error = input_ff_create_mlnx(dev, (void *)NULL, hid_lg4ff_control, FF_UPDATE_RATE);
 
 	if (error)
 		return error;
-- 
1.9.2

[PATCH v2 24/24] input: Replace ff-memless with ff-memless-next

[Michal Malý]

Replace ff-memless with ff-memless-next

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
---
 drivers/input/Kconfig      |  13 +-
 drivers/input/Makefile     |   1 -
 drivers/input/ff-memless.c | 547 ---------------------------------------------
 include/linux/input.h      |   3 -
 4 files changed, 1 insertion(+), 563 deletions(-)
 delete mode 100644 drivers/input/ff-memless.c

diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig
index 3780962..061ae3c 100644
--- a/drivers/input/Kconfig
+++ b/drivers/input/Kconfig
@@ -25,7 +25,7 @@ config INPUT
 
 if INPUT
 
-config INPUT_FF_MEMLESS
+config INPUT_FF_MEMLESS_NEXT
 	tristate "Support for memoryless force-feedback devices"
 	help
 	  Say Y here if you have memoryless force-feedback input device
@@ -36,17 +36,6 @@ config INPUT_FF_MEMLESS
 	  If unsure, say N.
 
 	  To compile this driver as a module, choose M here: the
-	  module will be called ff-memless.
-
-config INPUT_FF_MEMLESS_NEXT
-	tristate "New version of support for memoryless force-feedback devices"
-	help
-	  Say Y here to enable a new version of support for memoryless force
-	  feedback devices.
-
-	  If unsure, say N.
-
-	  To compile this driver as a module, choose M here: the
 	  module will be called ff-memless-next.
 
 config INPUT_POLLDEV
diff --git a/drivers/input/Makefile b/drivers/input/Makefile
index b4f11f5..f7ae055 100644
--- a/drivers/input/Makefile
+++ b/drivers/input/Makefile
@@ -7,7 +7,6 @@
 obj-$(CONFIG_INPUT)		+= input-core.o
 input-core-y := input.o input-compat.o input-mt.o ff-core.o
 
-obj-$(CONFIG_INPUT_FF_MEMLESS)	+= ff-memless.o
 obj-$(CONFIG_INPUT_FF_MEMLESS_NEXT)	+= ff-memless-next.o
 obj-$(CONFIG_INPUT_POLLDEV)	+= input-polldev.o
 obj-$(CONFIG_INPUT_SPARSEKMAP)	+= sparse-keymap.o
diff --git a/drivers/input/ff-memless.c b/drivers/input/ff-memless.c
deleted file mode 100644
index 74c0d8c..0000000
--- a/drivers/input/ff-memless.c
+++ /dev/null
@@ -1,547 +0,0 @@
-/*
- *  Force feedback support for memoryless devices
- *
- *  Copyright (c) 2006 Anssi Hannula <anssi.hannula@gmail.com>
- *  Copyright (c) 2006 Dmitry Torokhov <dtor@mail.ru>
- */
-
-/*
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-/* #define DEBUG */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/slab.h>
-#include <linux/input.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/spinlock.h>
-#include <linux/jiffies.h>
-#include <linux/fixp-arith.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Anssi Hannula <anssi.hannula@gmail.com>");
-MODULE_DESCRIPTION("Force feedback support for memoryless devices");
-
-/* Number of effects handled with memoryless devices */
-#define FF_MEMLESS_EFFECTS	16
-
-/* Envelope update interval in ms */
-#define FF_ENVELOPE_INTERVAL	50
-
-#define FF_EFFECT_STARTED	0
-#define FF_EFFECT_PLAYING	1
-#define FF_EFFECT_ABORTING	2
-
-struct ml_effect_state {
-	struct ff_effect *effect;
-	unsigned long flags;	/* effect state (STARTED, PLAYING, etc) */
-	int count;		/* loop count of the effect */
-	unsigned long play_at;	/* start time */
-	unsigned long stop_at;	/* stop time */
-	unsigned long adj_at;	/* last time the effect was sent */
-};
-
-struct ml_device {
-	void *private;
-	struct ml_effect_state states[FF_MEMLESS_EFFECTS];
-	int gain;
-	struct timer_list timer;
-	struct input_dev *dev;
-
-	int (*play_effect)(struct input_dev *dev, void *data,
-			   struct ff_effect *effect);
-};
-
-static const struct ff_envelope *get_envelope(const struct ff_effect *effect)
-{
-	static const struct ff_envelope empty_envelope;
-
-	switch (effect->type) {
-	case FF_PERIODIC:
-		return &effect->u.periodic.envelope;
-
-	case FF_CONSTANT:
-		return &effect->u.constant.envelope;
-
-	default:
-		return &empty_envelope;
-	}
-}
-
-/*
- * Check for the next time envelope requires an update on memoryless devices
- */
-static unsigned long calculate_next_time(struct ml_effect_state *state)
-{
-	const struct ff_envelope *envelope = get_envelope(state->effect);
-	unsigned long attack_stop, fade_start, next_fade;
-
-	if (envelope->attack_length) {
-		attack_stop = state->play_at +
-			msecs_to_jiffies(envelope->attack_length);
-		if (time_before(state->adj_at, attack_stop))
-			return state->adj_at +
-					msecs_to_jiffies(FF_ENVELOPE_INTERVAL);
-	}
-
-	if (state->effect->replay.length) {
-		if (envelope->fade_length) {
-			/* check when fading should start */
-			fade_start = state->stop_at -
-					msecs_to_jiffies(envelope->fade_length);
-
-			if (time_before(state->adj_at, fade_start))
-				return fade_start;
-
-			/* already fading, advance to next checkpoint */
-			next_fade = state->adj_at +
-					msecs_to_jiffies(FF_ENVELOPE_INTERVAL);
-			if (time_before(next_fade, state->stop_at))
-				return next_fade;
-		}
-
-		return state->stop_at;
-	}
-
-	return state->play_at;
-}
-
-static void ml_schedule_timer(struct ml_device *ml)
-{
-	struct ml_effect_state *state;
-	unsigned long now = jiffies;
-	unsigned long earliest = 0;
-	unsigned long next_at;
-	int events = 0;
-	int i;
-
-	pr_debug("calculating next timer\n");
-
-	for (i = 0; i < FF_MEMLESS_EFFECTS; i++) {
-
-		state = &ml->states[i];
-
-		if (!test_bit(FF_EFFECT_STARTED, &state->flags))
-			continue;
-
-		if (test_bit(FF_EFFECT_PLAYING, &state->flags))
-			next_at = calculate_next_time(state);
-		else
-			next_at = state->play_at;
-
-		if (time_before_eq(now, next_at) &&
-		    (++events == 1 || time_before(next_at, earliest)))
-			earliest = next_at;
-	}
-
-	if (!events) {
-		pr_debug("no actions\n");
-		del_timer(&ml->timer);
-	} else {
-		pr_debug("timer set\n");
-		mod_timer(&ml->timer, earliest);
-	}
-}
-
-/*
- * Apply an envelope to a value
- */
-static int apply_envelope(struct ml_effect_state *state, int value,
-			  struct ff_envelope *envelope)
-{
-	struct ff_effect *effect = state->effect;
-	unsigned long now = jiffies;
-	int time_from_level;
-	int time_of_envelope;
-	int envelope_level;
-	int difference;
-
-	if (envelope->attack_length &&
-	    time_before(now,
-			state->play_at + msecs_to_jiffies(envelope->attack_length))) {
-		pr_debug("value = 0x%x, attack_level = 0x%x\n",
-			 value, envelope->attack_level);
-		time_from_level = jiffies_to_msecs(now - state->play_at);
-		time_of_envelope = envelope->attack_length;
-		envelope_level = min_t(u16, envelope->attack_level, 0x7fff);
-
-	} else if (envelope->fade_length && effect->replay.length &&
-		   time_after(now,
-			      state->stop_at - msecs_to_jiffies(envelope->fade_length)) &&
-		   time_before(now, state->stop_at)) {
-		time_from_level = jiffies_to_msecs(state->stop_at - now);
-		time_of_envelope = envelope->fade_length;
-		envelope_level = min_t(u16, envelope->fade_level, 0x7fff);
-	} else
-		return value;
-
-	difference = abs(value) - envelope_level;
-
-	pr_debug("difference = %d\n", difference);
-	pr_debug("time_from_level = 0x%x\n", time_from_level);
-	pr_debug("time_of_envelope = 0x%x\n", time_of_envelope);
-
-	difference = difference * time_from_level / time_of_envelope;
-
-	pr_debug("difference = %d\n", difference);
-
-	return value < 0 ?
-		-(difference + envelope_level) : (difference + envelope_level);
-}
-
-/*
- * Return the type the effect has to be converted into (memless devices)
- */
-static int get_compatible_type(struct ff_device *ff, int effect_type)
-{
-
-	if (test_bit(effect_type, ff->ffbit))
-		return effect_type;
-
-	if (effect_type == FF_PERIODIC && test_bit(FF_RUMBLE, ff->ffbit))
-		return FF_RUMBLE;
-
-	pr_err("invalid type in get_compatible_type()\n");
-
-	return 0;
-}
-
-/*
- * Only left/right direction should be used (under/over 0x8000) for
- * forward/reverse motor direction (to keep calculation fast & simple).
- */
-static u16 ml_calculate_direction(u16 direction, u16 force,
-				  u16 new_direction, u16 new_force)
-{
-	if (!force)
-		return new_direction;
-	if (!new_force)
-		return direction;
-	return (((u32)(direction >> 1) * force +
-		 (new_direction >> 1) * new_force) /
-		(force + new_force)) << 1;
-}
-
-/*
- * Combine two effects and apply gain.
- */
-static void ml_combine_effects(struct ff_effect *effect,
-			       struct ml_effect_state *state,
-			       int gain)
-{
-	struct ff_effect *new = state->effect;
-	unsigned int strong, weak, i;
-	int x, y;
-	fixp_t level;
-
-	switch (new->type) {
-	case FF_CONSTANT:
-		i = new->direction * 360 / 0xffff;
-		level = fixp_new16(apply_envelope(state,
-					new->u.constant.level,
-					&new->u.constant.envelope));
-		x = fixp_mult(fixp_sin(i), level) * gain / 0xffff;
-		y = fixp_mult(-fixp_cos(i), level) * gain / 0xffff;
-		/*
-		 * here we abuse ff_ramp to hold x and y of constant force
-		 * If in future any driver wants something else than x and y
-		 * in s8, this should be changed to something more generic
-		 */
-		effect->u.ramp.start_level =
-			clamp_val(effect->u.ramp.start_level + x, -0x80, 0x7f);
-		effect->u.ramp.end_level =
-			clamp_val(effect->u.ramp.end_level + y, -0x80, 0x7f);
-		break;
-
-	case FF_RUMBLE:
-		strong = (u32)new->u.rumble.strong_magnitude * gain / 0xffff;
-		weak = (u32)new->u.rumble.weak_magnitude * gain / 0xffff;
-
-		if (effect->u.rumble.strong_magnitude + strong)
-			effect->direction = ml_calculate_direction(
-				effect->direction,
-				effect->u.rumble.strong_magnitude,
-				new->direction, strong);
-		else if (effect->u.rumble.weak_magnitude + weak)
-			effect->direction = ml_calculate_direction(
-				effect->direction,
-				effect->u.rumble.weak_magnitude,
-				new->direction, weak);
-		else
-			effect->direction = 0;
-		effect->u.rumble.strong_magnitude =
-			min(strong + effect->u.rumble.strong_magnitude,
-			    0xffffU);
-		effect->u.rumble.weak_magnitude =
-			min(weak + effect->u.rumble.weak_magnitude, 0xffffU);
-		break;
-
-	case FF_PERIODIC:
-		i = apply_envelope(state, abs(new->u.periodic.magnitude),
-				   &new->u.periodic.envelope);
-
-		/* here we also scale it 0x7fff => 0xffff */
-		i = i * gain / 0x7fff;
-
-		if (effect->u.rumble.strong_magnitude + i)
-			effect->direction = ml_calculate_direction(
-				effect->direction,
-				effect->u.rumble.strong_magnitude,
-				new->direction, i);
-		else
-			effect->direction = 0;
-		effect->u.rumble.strong_magnitude =
-			min(i + effect->u.rumble.strong_magnitude, 0xffffU);
-		effect->u.rumble.weak_magnitude =
-			min(i + effect->u.rumble.weak_magnitude, 0xffffU);
-		break;
-
-	default:
-		pr_err("invalid type in ml_combine_effects()\n");
-		break;
-	}
-
-}
-
-
-/*
- * Because memoryless devices have only one effect per effect type active
- * at one time we have to combine multiple effects into one
- */
-static int ml_get_combo_effect(struct ml_device *ml,
-			       unsigned long *effect_handled,
-			       struct ff_effect *combo_effect)
-{
-	struct ff_effect *effect;
-	struct ml_effect_state *state;
-	int effect_type;
-	int i;
-
-	memset(combo_effect, 0, sizeof(struct ff_effect));
-
-	for (i = 0; i < FF_MEMLESS_EFFECTS; i++) {
-		if (__test_and_set_bit(i, effect_handled))
-			continue;
-
-		state = &ml->states[i];
-		effect = state->effect;
-
-		if (!test_bit(FF_EFFECT_STARTED, &state->flags))
-			continue;
-
-		if (time_before(jiffies, state->play_at))
-			continue;
-
-		/*
-		 * here we have started effects that are either
-		 * currently playing (and may need be aborted)
-		 * or need to start playing.
-		 */
-		effect_type = get_compatible_type(ml->dev->ff, effect->type);
-		if (combo_effect->type != effect_type) {
-			if (combo_effect->type != 0) {
-				__clear_bit(i, effect_handled);
-				continue;
-			}
-			combo_effect->type = effect_type;
-		}
-
-		if (__test_and_clear_bit(FF_EFFECT_ABORTING, &state->flags)) {
-			__clear_bit(FF_EFFECT_PLAYING, &state->flags);
-			__clear_bit(FF_EFFECT_STARTED, &state->flags);
-		} else if (effect->replay.length &&
-			   time_after_eq(jiffies, state->stop_at)) {
-
-			__clear_bit(FF_EFFECT_PLAYING, &state->flags);
-
-			if (--state->count <= 0) {
-				__clear_bit(FF_EFFECT_STARTED, &state->flags);
-			} else {
-				state->play_at = jiffies +
-					msecs_to_jiffies(effect->replay.delay);
-				state->stop_at = state->play_at +
-					msecs_to_jiffies(effect->replay.length);
-			}
-		} else {
-			__set_bit(FF_EFFECT_PLAYING, &state->flags);
-			state->adj_at = jiffies;
-			ml_combine_effects(combo_effect, state, ml->gain);
-		}
-	}
-
-	return combo_effect->type != 0;
-}
-
-static void ml_play_effects(struct ml_device *ml)
-{
-	struct ff_effect effect;
-	DECLARE_BITMAP(handled_bm, FF_MEMLESS_EFFECTS);
-
-	memset(handled_bm, 0, sizeof(handled_bm));
-
-	while (ml_get_combo_effect(ml, handled_bm, &effect))
-		ml->play_effect(ml->dev, ml->private, &effect);
-
-	ml_schedule_timer(ml);
-}
-
-static void ml_effect_timer(unsigned long timer_data)
-{
-	struct input_dev *dev = (struct input_dev *)timer_data;
-	struct ml_device *ml = dev->ff->private;
-	unsigned long flags;
-
-	pr_debug("timer: updating effects\n");
-
-	spin_lock_irqsave(&dev->event_lock, flags);
-	ml_play_effects(ml);
-	spin_unlock_irqrestore(&dev->event_lock, flags);
-}
-
-/*
- * Sets requested gain for FF effects. Called with dev->event_lock held.
- */
-static void ml_ff_set_gain(struct input_dev *dev, u16 gain)
-{
-	struct ml_device *ml = dev->ff->private;
-	int i;
-
-	ml->gain = gain;
-
-	for (i = 0; i < FF_MEMLESS_EFFECTS; i++)
-		__clear_bit(FF_EFFECT_PLAYING, &ml->states[i].flags);
-
-	ml_play_effects(ml);
-}
-
-/*
- * Start/stop specified FF effect. Called with dev->event_lock held.
- */
-static int ml_ff_playback(struct input_dev *dev, int effect_id, int value)
-{
-	struct ml_device *ml = dev->ff->private;
-	struct ml_effect_state *state = &ml->states[effect_id];
-
-	if (value > 0) {
-		pr_debug("initiated play\n");
-
-		__set_bit(FF_EFFECT_STARTED, &state->flags);
-		state->count = value;
-		state->play_at = jiffies +
-				 msecs_to_jiffies(state->effect->replay.delay);
-		state->stop_at = state->play_at +
-				 msecs_to_jiffies(state->effect->replay.length);
-		state->adj_at = state->play_at;
-
-	} else {
-		pr_debug("initiated stop\n");
-
-		if (test_bit(FF_EFFECT_PLAYING, &state->flags))
-			__set_bit(FF_EFFECT_ABORTING, &state->flags);
-		else
-			__clear_bit(FF_EFFECT_STARTED, &state->flags);
-	}
-
-	ml_play_effects(ml);
-
-	return 0;
-}
-
-static int ml_ff_upload(struct input_dev *dev,
-			struct ff_effect *effect, struct ff_effect *old)
-{
-	struct ml_device *ml = dev->ff->private;
-	struct ml_effect_state *state = &ml->states[effect->id];
-
-	spin_lock_irq(&dev->event_lock);
-
-	if (test_bit(FF_EFFECT_STARTED, &state->flags)) {
-		__clear_bit(FF_EFFECT_PLAYING, &state->flags);
-		state->play_at = jiffies +
-				 msecs_to_jiffies(state->effect->replay.delay);
-		state->stop_at = state->play_at +
-				 msecs_to_jiffies(state->effect->replay.length);
-		state->adj_at = state->play_at;
-		ml_schedule_timer(ml);
-	}
-
-	spin_unlock_irq(&dev->event_lock);
-
-	return 0;
-}
-
-static void ml_ff_destroy(struct ff_device *ff)
-{
-	struct ml_device *ml = ff->private;
-
-	kfree(ml->private);
-}
-
-/**
- * input_ff_create_memless() - create memoryless force-feedback device
- * @dev: input device supporting force-feedback
- * @data: driver-specific data to be passed into @play_effect
- * @play_effect: driver-specific method for playing FF effect
- */
-int input_ff_create_memless(struct input_dev *dev, void *data,
-		int (*play_effect)(struct input_dev *, void *, struct ff_effect *))
-{
-	struct ml_device *ml;
-	struct ff_device *ff;
-	int error;
-	int i;
-
-	ml = kzalloc(sizeof(struct ml_device), GFP_KERNEL);
-	if (!ml)
-		return -ENOMEM;
-
-	ml->dev = dev;
-	ml->private = data;
-	ml->play_effect = play_effect;
-	ml->gain = 0xffff;
-	setup_timer(&ml->timer, ml_effect_timer, (unsigned long)dev);
-
-	set_bit(FF_GAIN, dev->ffbit);
-
-	error = input_ff_create(dev, FF_MEMLESS_EFFECTS);
-	if (error) {
-		kfree(ml);
-		return error;
-	}
-
-	ff = dev->ff;
-	ff->private = ml;
-	ff->upload = ml_ff_upload;
-	ff->playback = ml_ff_playback;
-	ff->set_gain = ml_ff_set_gain;
-	ff->destroy = ml_ff_destroy;
-
-	/* we can emulate periodic effects with RUMBLE */
-	if (test_bit(FF_RUMBLE, ff->ffbit)) {
-		set_bit(FF_PERIODIC, dev->ffbit);
-		set_bit(FF_SINE, dev->ffbit);
-		set_bit(FF_TRIANGLE, dev->ffbit);
-		set_bit(FF_SQUARE, dev->ffbit);
-	}
-
-	for (i = 0; i < FF_MEMLESS_EFFECTS; i++)
-		ml->states[i].effect = &ff->effects[i];
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(input_ff_create_memless);
diff --git a/include/linux/input.h b/include/linux/input.h
index 82ce323..0c6c3f1 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -528,7 +528,4 @@ int input_ff_event(struct input_dev *dev, unsigned int type, unsigned int code,
 int input_ff_upload(struct input_dev *dev, struct ff_effect *effect, struct file *file);
 int input_ff_erase(struct input_dev *dev, int effect_id, struct file *file);
 
-int input_ff_create_memless(struct input_dev *dev, void *data,
-		int (*play_effect)(struct input_dev *, void *, struct ff_effect *));
-
 #endif
-- 
1.9.2

Re: [PATCH v2 01/24] input: Add ff-memless-next module

[Oliver Neukum]

On Tue, 2014-04-22 at 15:59 +0200, Michal Malý wrote:
> +/* Some devices might have a limit on how many uncombinable effects
> + * can be played at once */
> +static int mlnx_upload_conditional(struct mlnx_device *mlnxdev,
> +                                  const struct ff_effect *effect)
> +{
> +       struct mlnx_effect_command ecmd = {
> +               .cmd = MLNX_UPLOAD_UNCOMB,
> +               .u.uncomb.id = effect->id,
> +               .u.uncomb.effect = effect
> +       };
> +       return mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private,
> &ecmd);
> +}
> +

This mean you are building the structure on the stack

1. Are you sure nobody retains a reference?
2. That is needlessly inefficient

	Regards
		Oliver

Re: [PATCH v2 11/24] input: Port hid-holtekff to ff-memless-next

[Oliver Neukum]

On Tue, 2014-04-22 at 15:59 +0200, Michal Malý wrote:
>  static int holtekff_play(struct input_dev *dev, void *data,
> -                        struct ff_effect *effect)
> +                        const struct mlnx_effect_command *command)
>  {
>         struct hid_device *hid = input_get_drvdata(dev);
>         struct holtekff_device *holtekff = data;
> +       const struct mlnx_rumble_force *rumble_force =
> &command->u.rumble_force;
>         int left, right;
>         /* effect type 1, length 65535 msec */
>         u8 buf[HOLTEKFF_MSG_LENGTH] =
>                 { 0x01, 0x01, 0xff, 0xff, 0x10, 0xe0, 0x00 };

On the kernel stack.

>  
> -       left = effect->u.rumble.strong_magnitude;
> -       right = effect->u.rumble.weak_magnitude;
> -       dbg_hid("called with 0x%04x 0x%04x\n", left, right);
> +       switch (command->cmd) {
> +       case MLNX_START_RUMBLE:
> +               left = rumble_force->strong;
> +               right = rumble_force->weak;
> +               dbg_hid("called with 0x%04x 0x%04x\n", left, right);
>  
> -       if (!left && !right) {
> -               holtekff_send(holtekff, hid, stop_all6);
> -               return 0;
> -       }
> +               if (!left && !right) {
> +                       holtekff_send(holtekff, hid, stop_all6);
> +                       return 0;
> +               }
>  
> -       if (left)
> -               buf[1] |= 0x80;
> -       if (right)
> -               buf[1] |= 0x40;
> +               if (left)
> +                       buf[1] |= 0x80;
> +               if (right)
> +                       buf[1] |= 0x40;
>  
> -       /* The device takes a single magnitude, so we just sum them
> up. */
> -       buf[6] = min(0xf, (left >> 12) + (right >> 12));
> +               /* The device takes a single magnitude, so we just sum
> them up. */
> +               buf[6] = min(0xf, (left >> 12) + (right >> 12));
>  
> -       holtekff_send(holtekff, hid, buf);
> -       holtekff_send(holtekff, hid, start_effect_1);
> +               holtekff_send(holtekff, hid, buf);
> +               holtekff_send(holtekff, hid, start_effect_1);
> +               return 0;
> +       case MLNX_STOP_RUMBLE:
> +               holtekff_send(holtekff, hid, stop_all6);
> +               return 0;
> +       default:
> +               return -EINVAL;
> +       }
>  
>         return 0;
>  }

This looks very much like doing DMA on the kernel stack.
That is very strictly forbidden. The bug is also in the current
code, but would you care to fix it up?

	Regards
		Oliver

Re: [PATCH v2 01/24] input: Add ff-memless-next module

[Michal Malý]

On Wednesday 23 of April 2014 14:12:59 Oliver Neukum wrote:
> On Tue, 2014-04-22 at 15:59 +0200, Michal Malý wrote:
> > +/* Some devices might have a limit on how many uncombinable effects
> > + * can be played at once */
> > +static int mlnx_upload_conditional(struct mlnx_device *mlnxdev,
> > +                                  const struct ff_effect *effect)
> > +{
> > +       struct mlnx_effect_command ecmd = {
> > +               .cmd = MLNX_UPLOAD_UNCOMB,
> > +               .u.uncomb.id = effect->id,
> > +               .u.uncomb.effect = effect
> > +       };
> > +       return mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private,
> > &ecmd);
> > +}
> > +
> 
> This mean you are building the structure on the stack
> 
> 1. Are you sure nobody retains a reference?
Yes. The command is a one-shot thing so it makes no sense to hold a persistent 
reference to it. Should the HW-specific driver need to keep any data from the 
command - if the uses a workqueue to submit data to the device for instance - 
it should keep its own copy of the data. The idea is to keep MLNX and HW-
specific driver as separated as possible to prevent any race conditions.

> 2. That is needlessly inefficient
Are you suggesting I drop the 'consts' and keep the memory preallocated?

Thanks for the feedback,
Michal

Re: [PATCH v2 11/24] input: Port hid-holtekff to ff-memless-next

[Michal Malý]

On Wednesday 23 of April 2014 14:17:50 Oliver Neukum wrote:
> On Tue, 2014-04-22 at 15:59 +0200, Michal Malý wrote:
> >  static int holtekff_play(struct input_dev *dev, void *data,
> > 
> > -                        struct ff_effect *effect)
> > +                        const struct mlnx_effect_command *command)
> > 
> >  {
> >  
> >         struct hid_device *hid = input_get_drvdata(dev);
> >         struct holtekff_device *holtekff = data;
> > 
> > +       const struct mlnx_rumble_force *rumble_force =
> > &command->u.rumble_force;
> > 
> >         int left, right;
> >         /* effect type 1, length 65535 msec */
> >         u8 buf[HOLTEKFF_MSG_LENGTH] =
> >         
> >                 { 0x01, 0x01, 0xff, 0xff, 0x10, 0xe0, 0x00 };
> 
> On the kernel stack.
> 
> > -       left = effect->u.rumble.strong_magnitude;
> > -       right = effect->u.rumble.weak_magnitude;
> > -       dbg_hid("called with 0x%04x 0x%04x\n", left, right);
> > +       switch (command->cmd) {
> > +       case MLNX_START_RUMBLE:
> > +               left = rumble_force->strong;
> > +               right = rumble_force->weak;
> > +               dbg_hid("called with 0x%04x 0x%04x\n", left, right);
> > 
> > -       if (!left && !right) {
> > -               holtekff_send(holtekff, hid, stop_all6);
> > -               return 0;
> > -       }
> > +               if (!left && !right) {
> > +                       holtekff_send(holtekff, hid, stop_all6);
> > +                       return 0;
> > +               }
> > 
> > -       if (left)
> > -               buf[1] |= 0x80;
> > -       if (right)
> > -               buf[1] |= 0x40;
> > +               if (left)
> > +                       buf[1] |= 0x80;
> > +               if (right)
> > +                       buf[1] |= 0x40;
> > 
> > -       /* The device takes a single magnitude, so we just sum them
> > up. */
> > -       buf[6] = min(0xf, (left >> 12) + (right >> 12));
> > +               /* The device takes a single magnitude, so we just sum
> > them up. */
> > +               buf[6] = min(0xf, (left >> 12) + (right >> 12));
> > 
> > -       holtekff_send(holtekff, hid, buf);
> > -       holtekff_send(holtekff, hid, start_effect_1);
> > +               holtekff_send(holtekff, hid, buf);
> > +               holtekff_send(holtekff, hid, start_effect_1);
> > +               return 0;
> > +       case MLNX_STOP_RUMBLE:
> > +               holtekff_send(holtekff, hid, stop_all6);
> > +               return 0;
> > +       default:
> > +               return -EINVAL;
> > +       }
> > 
> >         return 0;
> >  
> >  }
> 
> This looks very much like doing DMA on the kernel stack.
> That is very strictly forbidden. The bug is also in the current
> code, but would you care to fix it up?

Okay, I'll look into it.

Michal

Re: [PATCH v2 01/24] input: Add ff-memless-next module

[Oliver Neukum]

On Wed, 2014-04-23 at 14:30 +0200, Michal Malý wrote:

> > 2. That is needlessly inefficient
> Are you suggesting I drop the 'consts' and keep the memory preallocated?

Yes.

	Regards
		Oliver

Re: [PATCH v2 09/24] input: Port hid-dr to ff-memless-next

[Oliver Neukum]

On Tue, 2014-04-22 at 15:59 +0200, Michal Malý wrote:
>  static int drff_play(struct input_dev *dev, void *data,
> -                                struct ff_effect *effect)
> +                       const struct mlnx_effect_command *command)
>  {
>         struct hid_device *hid = input_get_drvdata(dev);
>         struct drff_device *drff = data;
> +       const struct mlnx_rumble_force *rumble_force =
> &command->u.rumble_force;
>         int strong, weak;
>  
> -       strong = effect->u.rumble.strong_magnitude;
> -       weak = effect->u.rumble.weak_magnitude;
> +       strong = rumble_force->strong;
> +       weak = rumble_force->weak;
>  
>         dbg_hid("called with 0x%04x 0x%04x", strong, weak);
>  
> -       if (strong || weak) {
> -               strong = strong * 0xff / 0xffff;
> -               weak = weak * 0xff / 0xffff;
> -
> -               /* While reverse engineering this device, I found that
> when
> -                  this value is set, it causes the strong rumble to
> function
> -                  at a near maximum speed, so we'll bypass it. */
> -               if (weak == 0x0a)
> -                       weak = 0x0b;
> -
> -               drff->report->field[0]->value[0] = 0x51;
> -               drff->report->field[0]->value[1] = 0x00;
> -               drff->report->field[0]->value[2] = weak;
> -               drff->report->field[0]->value[4] = strong;
> -               hid_hw_request(hid, drff->report, HID_REQ_SET_REPORT);
> -
> -               drff->report->field[0]->value[0] = 0xfa;
> -               drff->report->field[0]->value[1] = 0xfe;
> -       } else {
> +       switch (command->cmd) {
> +       case MLNX_START_RUMBLE:
> +               if (strong || weak) {
> +                       strong = strong * 0xff / 0xffff;
> +                       weak = weak * 0xff / 0xffff;
> +
> +                       /* While reverse engineering this device, I
> found that when
> +                       this value is set, it causes the strong rumble
> to function
> +                       at a near maximum speed, so we'll bypass it.
> */
> +                       if (weak == 0x0a)
> +                               weak = 0x0b;
> +
> +                       drff->report->field[0]->value[0] = 0x51;
> +                       drff->report->field[0]->value[1] = 0x00;
> +                       drff->report->field[0]->value[2] = weak;
> +                       drff->report->field[0]->value[4] = strong;

This looks like an endianness bug.

> +                       hid_hw_request(hid, drff->report,
> HID_REQ_SET_REPORT);

	Regards
		Oliver

Re: [PATCH v2 09/24] input: Port hid-dr to ff-memless-next

[simon]

> On Wed, Apr 23, 2014 at 03:14:44PM +0000, madcatxster@devoid-pointer.net
> wrote:
>> This is another case where even the old code was flawed, right? Should
>> I try to stuff the fixes into these patches or would a few extra
>> patches addressing these problems be an easier to review solution? I
>> can append such patches to the MLNX patchset.
>
> Changes addressing pre-existing problem should go into separate patches
> (preferably applicable first).
>

As a by-stander who would like to see MLNX move forward, should it be
heldback by pre-existing problems in drivers that the MLNX dev(s) don't
have hardware to test against...?

Simon.

Re: [PATCH v2 09/24] input: Port hid-dr to ff-memless-next

[Michal Malý]

On Wednesday 23 of April 2014 11:47:05 simon@mungewell.org wrote:
> > On Wed, Apr 23, 2014 at 03:14:44PM +0000, madcatxster@devoid-pointer.net
> > 
> > wrote:
> >> This is another case where even the old code was flawed, right? Should
> >> I try to stuff the fixes into these patches or would a few extra
> >> patches addressing these problems be an easier to review solution? I
> >> can append such patches to the MLNX patchset.
> > 
> > Changes addressing pre-existing problem should go into separate patches
> > (preferably applicable first).
> 
> As a by-stander who would like to see MLNX move forward, should it be
> heldback by pre-existing problems in drivers that the MLNX dev(s) don't
> have hardware to test against...?
> 
> Simon.

Either approach is fine be me - I can rebase the MLNX patchset against the fixes 
and submit it again. I suppose that this is a good opportunity to fix a bunch 
old issues that would pass unnoticed otherwise. I would however appreciate as 
much comments regarding MLNX itself before I begin cleaning the ancient dust.

Thanks for your input,
Michal

Re: [PATCH v2 01/24] input: Add ff-memless-next module

[Dmitry Torokhov]

On Wed, Apr 23, 2014 at 02:12:59PM +0200, Oliver Neukum wrote:
> On Tue, 2014-04-22 at 15:59 +0200, Michal Malý wrote:
> > +/* Some devices might have a limit on how many uncombinable effects
> > + * can be played at once */
> > +static int mlnx_upload_conditional(struct mlnx_device *mlnxdev,
> > +                                  const struct ff_effect *effect)
> > +{
> > +       struct mlnx_effect_command ecmd = {
> > +               .cmd = MLNX_UPLOAD_UNCOMB,
> > +               .u.uncomb.id = effect->id,
> > +               .u.uncomb.effect = effect
> > +       };
> > +       return mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private,
> > &ecmd);
> > +}
> > +
> 
> This mean you are building the structure on the stack
> 
> 1. Are you sure nobody retains a reference?
> 2. That is needlessly inefficient

Why is it inefficient?

-- 
Dmitry

Re: [PATCH v2 11/24] input: Port hid-holtekff to ff-memless-next

[Dmitry Torokhov]

On Wed, Apr 23, 2014 at 02:17:50PM +0200, Oliver Neukum wrote:
> On Tue, 2014-04-22 at 15:59 +0200, Michal Malý wrote:
> >  static int holtekff_play(struct input_dev *dev, void *data,
> > -                        struct ff_effect *effect)
> > +                        const struct mlnx_effect_command *command)
> >  {
> >         struct hid_device *hid = input_get_drvdata(dev);
> >         struct holtekff_device *holtekff = data;
> > +       const struct mlnx_rumble_force *rumble_force =
> > &command->u.rumble_force;
> >         int left, right;
> >         /* effect type 1, length 65535 msec */
> >         u8 buf[HOLTEKFF_MSG_LENGTH] =
> >                 { 0x01, 0x01, 0xff, 0xff, 0x10, 0xe0, 0x00 };
> 
> On the kernel stack.
> 
> >  
> > -       left = effect->u.rumble.strong_magnitude;
> > -       right = effect->u.rumble.weak_magnitude;
> > -       dbg_hid("called with 0x%04x 0x%04x\n", left, right);
> > +       switch (command->cmd) {
> > +       case MLNX_START_RUMBLE:
> > +               left = rumble_force->strong;
> > +               right = rumble_force->weak;
> > +               dbg_hid("called with 0x%04x 0x%04x\n", left, right);
> >  
> > -       if (!left && !right) {
> > -               holtekff_send(holtekff, hid, stop_all6);
> > -               return 0;
> > -       }
> > +               if (!left && !right) {
> > +                       holtekff_send(holtekff, hid, stop_all6);
> > +                       return 0;
> > +               }
> >  
> > -       if (left)
> > -               buf[1] |= 0x80;
> > -       if (right)
> > -               buf[1] |= 0x40;
> > +               if (left)
> > +                       buf[1] |= 0x80;
> > +               if (right)
> > +                       buf[1] |= 0x40;
> >  
> > -       /* The device takes a single magnitude, so we just sum them
> > up. */
> > -       buf[6] = min(0xf, (left >> 12) + (right >> 12));
> > +               /* The device takes a single magnitude, so we just sum
> > them up. */
> > +               buf[6] = min(0xf, (left >> 12) + (right >> 12));
> >  
> > -       holtekff_send(holtekff, hid, buf);
> > -       holtekff_send(holtekff, hid, start_effect_1);
> > +               holtekff_send(holtekff, hid, buf);
> > +               holtekff_send(holtekff, hid, start_effect_1);
> > +               return 0;
> > +       case MLNX_STOP_RUMBLE:
> > +               holtekff_send(holtekff, hid, stop_all6);
> > +               return 0;
> > +       default:
> > +               return -EINVAL;
> > +       }
> >  
> >         return 0;
> >  }
> 
> This looks very much like doing DMA on the kernel stack.

It isn't:

static void holtekff_send(struct holtekff_device *holtekff,
                          struct hid_device *hid,
                          const u8 data[HOLTEKFF_MSG_LENGTH])
{
        int i;

        for (i = 0; i < HOLTEKFF_MSG_LENGTH; i++) {
                holtekff->field->value[i] = data[i];
        }

        dbg_hid("sending %7ph\n", data);

        hid_hw_request(hid, holtekff->field->report, HID_REQ_SET_REPORT);
}

And also hid layer copies data a bunch of times over into DMA-safe
buffers.

> That is very strictly forbidden. The bug is also in the current
> code, but would you care to fix it up?
> 
> 	Regards
> 		Oliver
> 
> 

-- 
Dmitry

Re: [PATCH v2 01/24] input: Add ff-memless-next module

[Oliver Neukum]

On Wed, 2014-04-23 at 08:59 -0700, Dmitry Torokhov wrote:
> On Wed, Apr 23, 2014 at 02:12:59PM +0200, Oliver Neukum wrote:
> > On Tue, 2014-04-22 at 15:59 +0200, Michal Malý wrote:
> > > +/* Some devices might have a limit on how many uncombinable effects
> > > + * can be played at once */
> > > +static int mlnx_upload_conditional(struct mlnx_device *mlnxdev,
> > > +                                  const struct ff_effect *effect)
> > > +{
> > > +       struct mlnx_effect_command ecmd = {
> > > +               .cmd = MLNX_UPLOAD_UNCOMB,
> > > +               .u.uncomb.id = effect->id,
> > > +               .u.uncomb.effect = effect
> > > +       };
> > > +       return mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private,
> > > &ecmd);
> > > +}
> > > +
> > 
> > This mean you are building the structure on the stack
> > 
> > 1. Are you sure nobody retains a reference?
> > 2. That is needlessly inefficient
> 
> Why is it inefficient?

The compiler has to include the data structure and then make
a memcopy to the stack. Instead a pointer to the predined structure
could be passed.

	Regards
		Oliver

Re: [PATCH v2 01/24] input: Add ff-memless-next module

[Dmitry Torokhov]

On Wed, Apr 23, 2014 at 07:06:08PM +0200, Oliver Neukum wrote:
> On Wed, 2014-04-23 at 08:59 -0700, Dmitry Torokhov wrote:
> > On Wed, Apr 23, 2014 at 02:12:59PM +0200, Oliver Neukum wrote:
> > > On Tue, 2014-04-22 at 15:59 +0200, Michal Malý wrote:
> > > > +/* Some devices might have a limit on how many uncombinable effects
> > > > + * can be played at once */
> > > > +static int mlnx_upload_conditional(struct mlnx_device *mlnxdev,
> > > > +                                  const struct ff_effect *effect)
> > > > +{
> > > > +       struct mlnx_effect_command ecmd = {
> > > > +               .cmd = MLNX_UPLOAD_UNCOMB,
> > > > +               .u.uncomb.id = effect->id,
> > > > +               .u.uncomb.effect = effect
> > > > +       };
> > > > +       return mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private,
> > > > &ecmd);
> > > > +}
> > > > +
> > > 
> > > This mean you are building the structure on the stack
> > > 
> > > 1. Are you sure nobody retains a reference?
> > > 2. That is needlessly inefficient
> > 
> > Why is it inefficient?
> 
> The compiler has to include the data structure and then make
> a memcopy to the stack. Instead a pointer to the predined structure
> could be passed.

No, it does not do that. Memory on stack is reserved and zeroed out,
then individual members are filled in as requested. There is no memcopy.

Thanks.

-- 
Dmitry

Re: [PATCH v2 09/24] input: Port hid-dr to ff-memless-next

[Michal Malý]

On Wednesday 23 of April 2014 15:41:03 Oliver Neukum wrote:
> On Tue, 2014-04-22 at 15:59 +0200, Michal Malý wrote:
> >  static int drff_play(struct input_dev *dev, void *data,
> > 
> > -                                struct ff_effect *effect)
> > +                       const struct mlnx_effect_command *command)
> > 
> >  {
> >  
> >         struct hid_device *hid = input_get_drvdata(dev);
> >         struct drff_device *drff = data;
> > 
> > +       const struct mlnx_rumble_force *rumble_force =
> > &command->u.rumble_force;
> > 
> >         int strong, weak;
> > 
> > -       strong = effect->u.rumble.strong_magnitude;
> > -       weak = effect->u.rumble.weak_magnitude;
> > +       strong = rumble_force->strong;
> > +       weak = rumble_force->weak;
> > 
> >         dbg_hid("called with 0x%04x 0x%04x", strong, weak);
> > 
> > -       if (strong || weak) {
> > -               strong = strong * 0xff / 0xffff;
> > -               weak = weak * 0xff / 0xffff;
> > -
> > -               /* While reverse engineering this device, I found that
> > when
> > -                  this value is set, it causes the strong rumble to
> > function
> > -                  at a near maximum speed, so we'll bypass it. */
> > -               if (weak == 0x0a)
> > -                       weak = 0x0b;
> > -
> > -               drff->report->field[0]->value[0] = 0x51;
> > -               drff->report->field[0]->value[1] = 0x00;
> > -               drff->report->field[0]->value[2] = weak;
> > -               drff->report->field[0]->value[4] = strong;
> > -               hid_hw_request(hid, drff->report, HID_REQ_SET_REPORT);
> > -
> > -               drff->report->field[0]->value[0] = 0xfa;
> > -               drff->report->field[0]->value[1] = 0xfe;
> > -       } else {
> > +       switch (command->cmd) {
> > +       case MLNX_START_RUMBLE:
> > +               if (strong || weak) {
> > +                       strong = strong * 0xff / 0xffff;
> > +                       weak = weak * 0xff / 0xffff;
> > +
> > +                       /* While reverse engineering this device, I
> > found that when
> > +                       this value is set, it causes the strong rumble
> > to function
> > +                       at a near maximum speed, so we'll bypass it.
> > */
> > +                       if (weak == 0x0a)
> > +                               weak = 0x0b;
> > +
> > +                       drff->report->field[0]->value[0] = 0x51;
> > +                       drff->report->field[0]->value[1] = 0x00;
> > +                       drff->report->field[0]->value[2] = weak;
> > +                       drff->report->field[0]->value[4] = strong;
> 
> This looks like an endianness bug.

I don't have a big endian machine to check but why would this be an endianness 
issue? We're dealing with values all the time here, not addresses so I'd 
expect the 'weak' and 'strong' values to be truncated if they won't fit into 
byte. Division done beforehand makes sure that the values are within <0; 255> 
range. As far as I can see this is quite common in the HID and Input code. Am 
I missing something here?

Thanks,
Michal

Re: [PATCH v2 09/24] input: Port hid-dr to ff-memless-next

[Oliver Neukum]

On Thu, 2014-04-24 at 12:32 +0200, Michal Malý wrote:
> On Wednesday 23 of April 2014 15:41:03 Oliver Neukum wrote:
> > On Tue, 2014-04-22 at 15:59 +0200, Michal Malý wrote:
> > >  static int drff_play(struct input_dev *dev, void *data,
> > > 
> > > -                                struct ff_effect *effect)
> > > +                       const struct mlnx_effect_command *command)
> > > 
> > >  {
> > >  
> > >         struct hid_device *hid = input_get_drvdata(dev);
> > >         struct drff_device *drff = data;
> > > 
> > > +       const struct mlnx_rumble_force *rumble_force =
> > > &command->u.rumble_force;
> > > 
> > >         int strong, weak;
> > > 
> > > -       strong = effect->u.rumble.strong_magnitude;
> > > -       weak = effect->u.rumble.weak_magnitude;
> > > +       strong = rumble_force->strong;
> > > +       weak = rumble_force->weak;
> > > 
> > >         dbg_hid("called with 0x%04x 0x%04x", strong, weak);
> > > 
> > > -       if (strong || weak) {
> > > -               strong = strong * 0xff / 0xffff;
> > > -               weak = weak * 0xff / 0xffff;
> > > -
> > > -               /* While reverse engineering this device, I found that
> > > when
> > > -                  this value is set, it causes the strong rumble to
> > > function
> > > -                  at a near maximum speed, so we'll bypass it. */
> > > -               if (weak == 0x0a)
> > > -                       weak = 0x0b;
> > > -
> > > -               drff->report->field[0]->value[0] = 0x51;
> > > -               drff->report->field[0]->value[1] = 0x00;
> > > -               drff->report->field[0]->value[2] = weak;
> > > -               drff->report->field[0]->value[4] = strong;
> > > -               hid_hw_request(hid, drff->report, HID_REQ_SET_REPORT);
> > > -
> > > -               drff->report->field[0]->value[0] = 0xfa;
> > > -               drff->report->field[0]->value[1] = 0xfe;
> > > -       } else {
> > > +       switch (command->cmd) {
> > > +       case MLNX_START_RUMBLE:
> > > +               if (strong || weak) {
> > > +                       strong = strong * 0xff / 0xffff;
> > > +                       weak = weak * 0xff / 0xffff;
> > > +
> > > +                       /* While reverse engineering this device, I
> > > found that when
> > > +                       this value is set, it causes the strong rumble
> > > to function
> > > +                       at a near maximum speed, so we'll bypass it.
> > > */
> > > +                       if (weak == 0x0a)
> > > +                               weak = 0x0b;
> > > +
> > > +                       drff->report->field[0]->value[0] = 0x51;
> > > +                       drff->report->field[0]->value[1] = 0x00;
> > > +                       drff->report->field[0]->value[2] = weak;
> > > +                       drff->report->field[0]->value[4] = strong;
> > 
> > This looks like an endianness bug.
> 
> I don't have a big endian machine to check but why would this be an endianness 
> issue? We're dealing with values all the time here, not addresses so I'd 
> expect the 'weak' and 'strong' values to be truncated if they won't fit into 
> byte. Division done beforehand makes sure that the values are within <0; 255> 
> range. As far as I can see this is quite common in the HID and Input code. Am 
> I missing something here?

Sorry, I thought you were writing to 16bit variables.

	Regards
		Oliver