From patchwork Mon Dec 23 22:46:38 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Michal_Mal=C3=BD?= X-Patchwork-Id: 3399001 Return-Path: X-Original-To: patchwork-linux-input@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 0D747C0D4A for ; Mon, 23 Dec 2013 22:46:53 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id CD4E32025A for ; Mon, 23 Dec 2013 22:46:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 488A520218 for ; Mon, 23 Dec 2013 22:46:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758165Ab3LWWqr (ORCPT ); Mon, 23 Dec 2013 17:46:47 -0500 Received: from prifuk.spider.cz ([31.31.77.241]:56665 "EHLO prifuk.cz" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1757769Ab3LWWqq convert rfc822-to-8bit (ORCPT ); Mon, 23 Dec 2013 17:46:46 -0500 Received: from geidi-prime.localnet (228.123.broadband5.iol.cz [88.100.123.228]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: madcatxster@prifuk.cz) by prifuk.cz (Postfix) with ESMTPSA id 673642004F; Mon, 23 Dec 2013 23:46:39 +0100 (CET) From: Michal =?ISO-8859-1?Q?Mal=FD?= To: linux-input@vger.kernel.org Cc: linux-kernel@vger.kernel.org, elias.vds@gmail.com, joe@perches.com Subject: [RFC v3] Add ff-memless-next Date: Mon, 23 Dec 2013 23:46:38 +0100 Message-ID: <1494187.y8mYFDm1lA@geidi-prime> User-Agent: KMail/4.12 (Linux/3.13.0-1-ARCHMOD; KDE/4.12.0; x86_64; ; ) MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP One case where uncombinable effects were mishandled was corrected. Rest of the changes are just coding style fixes. Tested-by: Elias Vanderstuyft Signed-off-by: Michal Malý --- From 2de27604adeefa73e30ee049fae4c38265beb85d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Michal=20Mal=C3=BD?= Date: Mon, 23 Dec 2013 23:42:11 +0100 Subject: [PATCH] Add ff-memless-next --- Documentation/input/ff-memless-next.txt | 145 ++++++ drivers/input/Kconfig | 12 + drivers/input/Makefile | 2 + drivers/input/ff-memless-next.c | 786 ++++++++++++++++++++++++++++++++ include/linux/input/ff-memless-next.h | 31 ++ 5 files changed, 976 insertions(+) create mode 100644 Documentation/input/ff-memless-next.txt create mode 100644 drivers/input/ff-memless-next.c create mode 100644 include/linux/input/ff-memless-next.h diff --git a/Documentation/input/ff-memless-next.txt b/Documentation/input/ff-memless-next.txt new file mode 100644 index 0000000..00f893d --- /dev/null +++ b/Documentation/input/ff-memless-next.txt @@ -0,0 +1,145 @@ +"ff-memless-next" force feedback module for memoryless devices. +By Michal Malý on 2013/12/21 +---------------------------------------------------------------------------- + +1. Introduction +~~~~~~~~~~~~~~~ +This document describes basic working principles of the "ff-memless-next" +and its purpose. This document also contains summary of "ff-memless-next" API +and brief instructions on how to use it to write a hardware-specific backend +with "ff-memless-next". Some specifics of ff-memless-next that might be of +interest for userspace developers are also discussed. + +2. Basic principles of ff-memless-next +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +A lot of commonly used force feedback devices do not have a memory of their +own. This means that it is not possible to upload a force feedback effect +to such a device and let the device's CPU handle the playback. Instead, +the device relies solely on its driver to tell it what force to generate. +"ff-memless-next" was written to serve in this capacity. Its purpose is to +calculate the overall force the device should apply and pass the result to +a hardware-specific backend which then submits the appropriate command to +the device. + +"ff-memless-next" differentiates between two types of force feedback effects, +"combinable" and "uncombinable". +"Combinable" effects are effects that generate a force of a given +magnitude and direction. The magnitude can change in time according to the +envelope of the effect and its waveform; the latter applies only to periodic +effects. Force generated by "combinable" effect does not depend on the position +of the device. Forces generated by each "combinable" effect that is active +are periodically recalculated as needed and superposed into one overall force. +"Combinable" effects are FF_CONSTANT, FF_PERIODIC and FF_RAMP. + +"Uncombinable" effects generate a force that depends on the position of +the device. "ff-memless-next" assumes that the device takes care of processing +such an effect. However, a device might have a limit on how many "uncombinable" +effects can be active at once and this limit might be lower than the maximum +effect count set in "ff-memless-next". "ff-memless-next" allows a +hardware-specific driver to check whether the device is able to play +an "uncombinable" effect. Error is reported back to userspace if the device +cannot play the effect. The hardware-specific driver may choose not to +perform this check in which case the userspace will have no way of knowing +whether an "uncombinable" is really being played or not. + +3. API provided by "ff-memless-next" +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +"ff-memless-next" provides an API for developers of hardware-specific +drivers. In order to use the API, the hardware-specific driver should +include +Functions and structs defined by this API are: + +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) +- Any hardware-specific driver that wants to use "ff-memless-next" must call +this function. The function takes care of creating and registering a force +feedback device within the kernel. It also initializes resources needed by +"ff-memless-next" to handle a new device. No other initialization steps are necessary. + Parameters: + * dev - pointer to valid struct input_dev + * data - pointer to custom data the hardware-specific backend + might need to pass to the control_effect() callback function + (discussed later). * data will be freed automatically by + "ff-memless-next" upon device's destruction. + * control_effect - A callback function. "ff-memless-next" will call + this function when it is done processing effects. + Implementation of control_effect() in the + hardware-specific driver should create an appropriate + command and submit it to the device. + This function is called with dev->event_lock + spinlock held. + update_rate - Rate in milliseconds at which envelopes and periodic + effects are recalculated. Minimum value is limited by the + kernel timer resolution and changes with value of + CONFIG_HZ. + +struct mlnx_effect_command +^^^^^^^^^^^^^^^^^^^^^^^^^^ +- This struct is passed to the hardware-specific backend in +the control_effect() function. See "ff-memless-next.h" for details. + +enum mlnx_commands +^^^^^^^^^^^^^^^^^^ +- Types of commands generated by ff-memless-next + MLNX_START_COMBINED - Start or update "combinable" effect + MLNX_STOP_COMBINED - Stop "combinable" effect. In most cases this means + to set the force to zero. + MLNX_UPLOAD_UNCOMB - Check if the device can accept and play + "uncombinable" effect. + Hardware-specific driver should return 0 + on success. + MLNX_START_UNCOMB - Start playback of "uncombinable" effect. + MLNX_STOP_UNCOMB - Stop playback of "uncombinable" effect. + +struct mlnx_simple_force +^^^^^^^^^^^^^^^^^^^^^^^^ + x - overall force along X axis + y - overall force along Y axis + +struct mlnx_uncomb_effect +^^^^^^^^^^^^^^^^^^^^^^^^^ +- Information about "uncombinable" effect. + id - internal ID of the effect + * effect - pointer to the internal copy of the effect kept by + "ff-memless-next". This pointer will remain valid until + the effect is removed. + +Sample implementation of a dummy driver that uses "ff-memless-next" is +available at "git://prifuk.cz/ff-dummy-device". Link to the source will +be kept up to date. + +Direction of the effect's force translates to Cartesian coordinates system +as follows: + Direction = 0: Down + Direction (0; 16384): 3rd quadrant + Direction = 16384: Left + Direction (16385; 32768): 2nd quadrant + Direction = 32768: Up + Direction (32769; 49152): 1st quadrant + Direction = 49152: Right + Direction (49153; 65535) :4th quadrant + Direction = 65565: Down + +4. Specifics of "ff-memless-next" for userspace developers +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +None of the persons involved in development or testing of "ff-memless-next" +is aware of any reference force feedback specifications. "ff-memless-next" +tries to adhere to Microsoft's DirectInput specifications because we +believe that is what most developers have experience with. + +- Waveforms of periodic effects do not start at the origin, but as follows: + SAW_UP: At minimum + SAW_DOWN: At maximum + SQUARE: At maximum + TRIANGLE: At maximum + SINE: At origin + +- Updating periodic effects: + - All periodic effects are restarted when their parameters are updated. + +- Updating effects of finite duration: + - Once an effect of finite length finishes playing, it is considered + stopped. Only effects that are playing can be updated on the fly. + Therefore effects of finite duration can by updated only until + they finish playing. diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig index a11ff74..893ab00 100644 --- a/drivers/input/Kconfig +++ b/drivers/input/Kconfig @@ -77,6 +77,18 @@ config INPUT_MATRIXKMAP To compile this driver as a module, choose M here: the module will be called matrix-keymap. +config INPUT_FF_MEMLESS_NEXT + tristate "New version of support for memoryless force feedback devices" + help + Say Y here if you want to enable support for various memoryless + force feedback devices (as of now there is no hardware-specific + driver that supports this) + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called ff-memless-next. + comment "Userland interfaces" config INPUT_MOUSEDEV diff --git a/drivers/input/Makefile b/drivers/input/Makefile index 5ca3f63..269a22d 100644 --- a/drivers/input/Makefile +++ b/drivers/input/Makefile @@ -16,6 +16,8 @@ obj-$(CONFIG_INPUT_MOUSEDEV) += mousedev.o obj-$(CONFIG_INPUT_JOYDEV) += joydev.o obj-$(CONFIG_INPUT_EVDEV) += evdev.o obj-$(CONFIG_INPUT_EVBUG) += evbug.o +obj-$(CONFIG_INPUT_MATRIXKMAP) += matrix-keymap.o +obj-$(CONFIG_INPUT_FF_MEMLESS_NEXT) += ff-memless-next.o obj-$(CONFIG_INPUT_KEYBOARD) += keyboard/ obj-$(CONFIG_INPUT_MOUSE) += mouse/ diff --git a/drivers/input/ff-memless-next.c b/drivers/input/ff-memless-next.c new file mode 100644 index 0000000..979b823 --- /dev/null +++ b/drivers/input/ff-memless-next.c @@ -0,0 +1,786 @@ +/* + * 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. + * + * Copyright(c) 2013 Michal Maly + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include + +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 ((1000 / CONFIG_HZ) + 1) +#define FF_EFFECT_STARTED 1 +#define FF_EFFECT_PLAYING 2 + + +struct mlnx_effect { + struct ff_effect effect; + unsigned long flags; + unsigned long begin_at; + unsigned long stop_at; + unsigned long updated_at; + unsigned long attack_stop; + unsigned long fade_begin; + int repeat; + u16 playback_time; +}; + +struct mlnx_device { + u8 combinable_playing; + unsigned long update_rate_jiffies; + void *private; + struct mlnx_effect effects[FF_MAX_EFFECTS]; + int gain; + struct timer_list timer; + struct input_dev *dev; + + int (*control_effect)(struct input_dev *, void *, + const struct mlnx_effect_command *); +}; + +static __always_inline s32 mlnx_calculate_x_force(const s32 level, + const u16 direction) +{ + s32 new = (level * -fixp_sin(direction)) >> FRAC_N; + pr_debug("x force: %d\n", new); + return new; +} + +static __always_inline s32 mlnx_calculate_y_force(const s32 level, + const u16 direction) +{ + s32 new = (level * -fixp_cos(direction)) >> FRAC_N; + pr_debug("y force: %d\n", new); + return new; +} + +static inline 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 inline 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 __always_inline bool mlnx_is_square(const struct ff_effect *effect) +{ + if (effect->type == FF_PERIODIC) + return effect->u.periodic.waveform == FF_SQUARE; + return false; +} + +static __always_inline void mlnx_clr_playing(struct mlnx_effect *mlnxeff) +{ + __clear_bit(FF_EFFECT_PLAYING, &mlnxeff->flags); +} + +static __always_inline void mlnx_clr_started(struct mlnx_effect *mlnxeff) +{ + __clear_bit(FF_EFFECT_STARTED, &mlnxeff->flags); +} + +static __always_inline bool mlnx_is_playing(const struct mlnx_effect *mlnxeff) +{ + return test_bit(FF_EFFECT_PLAYING, &mlnxeff->flags); +} + +static __always_inline bool mlnx_is_started(const struct mlnx_effect *mlnxeff) +{ + return test_bit(FF_EFFECT_STARTED, &mlnxeff->flags); +} + +static __always_inline 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 ∅ + } +} + +/* 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 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; + if (effect->type == FF_PERIODIC) + mlnxeff->playback_time = effect->u.periodic.phase; +} + +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_CONSTANT: + case FF_PERIODIC: + 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_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 + mlnxdev->combinable_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 unsigned long dt = jiffies_to_msecs(now - mlnxeff->updated_at); + const s16 offset = effect->u.periodic.offset; + s32 new = level; + u16 t; + + mlnxeff->playback_time += dt; + t = mlnxeff->playback_time % 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 - 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; + } + + mlnxeff->playback_time = t; + /* Ensure that the offset did not make the value exceed s16 range */ + new = clamp(new, -0x7fff, 0x7fff); + pr_debug("level: %d, playback: %u, t: %u, dt: %lu\n", + new, mlnxeff->playback_time, t, dt); + return new; +} + +static s32 mlnx_calculate_ramp(const struct mlnx_effect *mlnxeff) +{ + const struct ff_effect *effect = &mlnxeff->effect; + const struct ff_envelope *envelope = mlnx_get_envelope(effect); + const unsigned long now = jiffies; + const u16 length = effect->replay.length; + 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; + else + return mlnxeff->attack_stop; + } + + /* Effect has an envelope with nonzero fade time */ + if (mlnxeff->effect.replay.length) { + if (envelope->fade_length) { + + /* Schedule the next update when the fade begins */ + if (time_before(mlnxeff->updated_at, mlnxeff->fade_begin)) + return mlnxeff->fade_begin; + + /* Already fading */ + else { + 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 */ + else + return fade_next; + } + } else + return mlnxeff->stop_at; + } + + /* There is no envelope */ + + /* Prevent the effect from being started twice */ + if (mlnxeff->begin_at == now && mlnx_is_playing(mlnxeff)) + return now - 1; + else + return mlnxeff->begin_at; +} + +static unsigned long mlnx_get_update_time(const struct mlnx_effect *mlnxeff, + const unsigned long update_rate_jiffies) +{ + const unsigned long now = jiffies; + unsigned long time, update_periodic; + + switch (mlnxeff->effect.type) { + /* Constant effect does not change with time, but it can have + * an envelope and a duration */ + case FF_CONSTANT: + return mlnx_get_envelope_update_time(mlnxeff, + update_rate_jiffies); + /* Periodic and ramp effects have to be periodically updated */ + case FF_PERIODIC: + case FF_RAMP: + time = mlnx_get_envelope_update_time(mlnxeff, + update_rate_jiffies); + + if (mlnx_is_square(&mlnxeff->effect)) { + const u16 half_T = mlnxeff->effect.u.periodic.period/2; + update_periodic = msecs_to_jiffies(half_T) + + mlnxeff->updated_at; + } else + update_periodic = mlnxeff->updated_at + + update_rate_jiffies; + + /* Periodic effect has to be updated earlier than envelope + * or envelope update time is in the past */ + if (time_before(update_periodic, time) || time_before(time, now)) + return update_periodic; + else /* Envelope needs to be updated */ + return time; + case FF_DAMPER: + case FF_FRICTION: + case FF_INERTIA: + case FF_SPRING: + default: + if (time_after_eq(mlnxeff->begin_at, now)) + return mlnxeff->begin_at; + else + return mlnxeff->stop_at; + } +} + +static void mlnx_schedule_playback(struct mlnx_device *mlnxdev) +{ + struct mlnx_effect *mlnxeff; + const unsigned long now = jiffies; + int events = 0; + int i; + unsigned long earliest = 0; + unsigned long time; + + /* Iterate over all effects and determine the earliest + * time when we have to attend to any */ + for (i = 0; i < FF_MAX_EFFECTS; i++) { + mlnxeff = &mlnxdev->effects[i]; + + if (!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); + } +} + +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_play_effects(struct mlnx_device *mlnxdev) +{ + const u16 gain = mlnxdev->gain; + const unsigned long now = jiffies; + int i; + int cfx = 0; + int cfy = 0; + + for (i = 0; i < FF_MAX_EFFECTS; i++) { + struct mlnx_effect *mlnxeff = &mlnxdev->effects[i]; + + if (!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_clr_started(mlnxeff); + mlnx_stop_effect(mlnxdev, mlnxeff); + } + + continue; + } + + switch (mlnxeff->effect.type) { + case FF_CONSTANT: + case FF_PERIODIC: + 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_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); + } + + 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++) + mlnx_clr_playing(&mlnxdev->effects[i]); + + mlnx_play_effects(mlnxdev); +} + +static int mlnx_startstop(struct input_dev *dev, int effect_id, int repeat) +{ + struct mlnx_device *mlnxdev = dev->ff->private; + struct mlnx_effect *mlnxeff = &mlnxdev->effects[effect_id]; + + if (repeat > 0) { + pr_debug("Starting effect ID %d\n", effect_id); + mlnxeff->repeat = repeat; + if (!mlnx_is_started(mlnxeff)) + 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); + } 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; + } + + if (mlnx_is_conditional(effect)) { + ret = mlnx_upload_conditional(mlnxdev, &mlnxeff->effect); + if (ret) { + /* Restore the original effect */ + if (old) + mlnxeff->effect = *old; + spin_unlock_irq(&dev->event_lock); + return ret; + } + } + + spin_unlock_irq(&dev->event_lock); + + return 0; +} + +int input_ff_create_mlnx(struct input_dev *dev, void *data, + int(*control_effect)(struct input_dev *, void *, const struct mlnx_effect_command *), + const u16 update_rate) +{ + struct mlnx_device *mlnxdev; + int ret; + + mlnxdev = kzalloc(sizeof(struct mlnx_device), GFP_KERNEL); + if (!mlnxdev) + return -ENOMEM; + + mlnxdev->dev = dev; + mlnxdev->private = data; + mlnxdev->control_effect = control_effect; + mlnxdev->gain = 0xffff; + mlnxdev->update_rate_jiffies = update_rate < FF_MIN_EFFECT_LENGTH ? + FF_MIN_EFFECT_LENGTH : update_rate; + setup_timer(&mlnxdev->timer, mlnx_timer_fired, (unsigned long)dev); + + ret = input_ff_create(dev, FF_MAX_EFFECTS); + if (ret) { + kfree(mlnxdev); + return ret; + } + + dev->ff->private = mlnxdev; + dev->ff->upload = mlnx_upload; + dev->ff->set_gain = mlnx_set_gain; + dev->ff->destroy = mlnx_destroy; + dev->ff->playback = mlnx_startstop; + + pr_debug("MLNX: Device successfully registered.\n"); + return 0; +} +EXPORT_SYMBOL_GPL(input_ff_create_mlnx); diff --git a/include/linux/input/ff-memless-next.h b/include/linux/input/ff-memless-next.h new file mode 100644 index 0000000..f2fb080 --- /dev/null +++ b/include/linux/input/ff-memless-next.h @@ -0,0 +1,31 @@ +#include + +enum mlnx_commands { + MLNX_START_COMBINED, + MLNX_STOP_COMBINED, + MLNX_START_UNCOMB, + MLNX_STOP_UNCOMB, + MLNX_UPLOAD_UNCOMB +}; + +struct mlnx_simple_force { + const s32 x; + const s32 y; +}; + +struct mlnx_uncomb_effect { + const int id; + const struct ff_effect *effect; +}; + +struct mlnx_effect_command { + const enum mlnx_commands cmd; + union { + const struct mlnx_simple_force simple_force; + const struct mlnx_uncomb_effect uncomb; + } u; +}; + +int input_ff_create_mlnx(struct input_dev *dev, void *data, + int(*control_effect)(struct input_dev *, void *, const struct mlnx_effect_command *), + const u16 update_rate);