--- /dev/null
+/*
+ * Force feedback support for various HID compliant devices by ThrustMaster:
+ * ThrustMaster FireStorm Dual Power 2
+ * and possibly others whose device ids haven't been added.
+ *
+ * Modified to support ThrustMaster devices by Zinx Verituse
+ * on 2003-01-25 from the Logitech force feedback driver,
+ * which is by Johann Deneux.
+ *
+ * Copyright (c) 2003 Zinx Verituse <zinx@epicsol.org>
+ * Copyright (c) 2002 Johann Deneux
+ */
+
+/*
+ * 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
+ */
+
+#include <linux/input.h>
+#include <linux/sched.h>
+
+#undef DEBUG
+#include <linux/usb.h>
+
+#include <linux/circ_buf.h>
+
+#include "hid.h"
+#include "fixp-arith.h"
+
+/* Usages for thrustmaster devices I know about */
+#define THRUSTMASTER_USAGE_RUMBLE_LR (HID_UP_GENDESK | 0xbb)
+#define DELAY_CALC(t,delay) ((t) + (delay)*HZ/1000)
+
+/* Effect status */
+#define EFFECT_STARTED 0 /* Effect is going to play after some time */
+#define EFFECT_PLAYING 1 /* Effect is playing */
+#define EFFECT_USED 2
+
+/* For tmff_device::flags */
+#define DEVICE_CLOSING 0 /* The driver is being unitialised */
+
+/* Check that the current process can access an effect */
+#define CHECK_OWNERSHIP(effect) (current->pid == 0 \
+ || effect.owner == current->pid)
+
+#define TMFF_CHECK_ID(id) ((id) >= 0 && (id) < TMFF_EFFECTS)
+
+#define TMFF_CHECK_OWNERSHIP(i, l) \
+ (test_bit(EFFECT_USED, l->effects[i].flags) \
+ && CHECK_OWNERSHIP(l->effects[i]))
+
+#define TMFF_EFFECTS 8
+
+struct tmff_effect {
+ pid_t owner;
+
+ struct ff_effect effect;
+
+ unsigned long flags[1];
+ unsigned int count; /* Number of times left to play */
+
+ unsigned long play_at; /* When the effect starts to play */
+ unsigned long stop_at; /* When the effect ends */
+};
+
+struct tmff_device {
+ struct hid_device *hid;
+
+ struct hid_report *report;
+
+ struct hid_field *rumble;
+
+ unsigned int effects_playing;
+ struct tmff_effect effects[TMFF_EFFECTS];
+ spinlock_t lock; /* device-level lock. Having locks on
+ a per-effect basis could be nice, but
+ isn't really necessary */
+
+ unsigned long flags[1]; /* Contains various information about the
+ state of the driver for this device */
+
+ struct timer_list timer;
+};
+
+/* Callbacks */
+static void hid_tmff_exit(struct hid_device *hid);
+static int hid_tmff_event(struct hid_device *hid, struct input_dev *input,
+ unsigned int type, unsigned int code, int value);
+static int hid_tmff_flush(struct input_dev *input, struct file *file);
+static int hid_tmff_upload_effect(struct input_dev *input,
+ struct ff_effect *effect);
+static int hid_tmff_erase(struct input_dev *input, int id);
+
+/* Local functions */
+static void hid_tmff_recalculate_timer(struct tmff_device *tmff);
+static void hid_tmff_timer(unsigned long timer_data);
+
+int hid_tmff_init(struct hid_device *hid)
+{
+ struct tmff_device *private;
+ struct list_head *pos;
+
+ private = kmalloc(sizeof(struct tmff_device), GFP_KERNEL);
+ if (!private) return -ENOMEM;
+
+ memset(private, 0, sizeof(struct tmff_device));
+ hid->ff_private = private;
+
+ /* Find the report to use */
+ __list_for_each(pos, &hid->report_enum[HID_OUTPUT_REPORT].report_list) {
+ struct hid_report *report = (struct hid_report *)pos;
+ int fieldnum;
+
+ for (fieldnum = 0; fieldnum < report->maxfield; ++fieldnum) {
+ struct hid_field *field = report->field[fieldnum];
+
+ if (field->maxusage <= 0)
+ continue;
+
+ switch (field->usage[0].hid) {
+ case THRUSTMASTER_USAGE_RUMBLE_LR:
+ if (field->report_count < 2) {
+ warn("ignoring THRUSTMASTER_USAGE_RUMBLE_LR with report_count < 2");
+ continue;
+ }
+
+ if (field->logical_maximum == field->logical_minimum) {
+ warn("ignoring THRUSTMASTER_USAGE_RUMBLE_LR with logical_maximum == logical_minimum");
+ continue;
+ }
+
+ if (private->report && private->report != report) {
+ warn("ignoring THRUSTMASTER_USAGE_RUMBLE_LR in other report");
+ continue;
+ }
+
+ if (private->rumble && private->rumble != field) {
+ warn("ignoring duplicate THRUSTMASTER_USAGE_RUMBLE_LR");
+ continue;
+ }
+
+ private->report = report;
+ private->rumble = field;
+
+ set_bit(FF_RUMBLE, hid->input.ffbit);
+ break;
+
+ default:
+ warn("ignoring unknown output usage %08x", field->usage[0].hid);
+ continue;
+ }
+
+ /* Fallthrough to here only when a valid usage is found */
+ hid->input.upload_effect = hid_tmff_upload_effect;
+ hid->input.flush = hid_tmff_flush;
+
+ set_bit(EV_FF, hid->input.evbit);
+ hid->input.ff_effects_max = TMFF_EFFECTS;
+ }
+ }
+
+ private->hid = hid;
+
+ spin_lock_init(&private->lock);
+ init_timer(&private->timer);
+ private->timer.data = (unsigned long)private;
+ private->timer.function = hid_tmff_timer;
+
+ /* Event and exit callbacks */
+ hid->ff_exit = hid_tmff_exit;
+ hid->ff_event = hid_tmff_event;
+
+ info("Force feedback for ThrustMaster rumble pad devices by Zinx Verituse <zinx@epicsol.org>");
+
+ return 0;
+}
+
+static void hid_tmff_exit(struct hid_device *hid)
+{
+ struct tmff_device *tmff = hid->ff_private;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tmff->lock, flags);
+
+ set_bit(DEVICE_CLOSING, tmff->flags);
+ del_timer_sync(&tmff->timer);
+
+ spin_unlock_irqrestore(&tmff->lock, flags);
+
+ kfree(tmff);
+}
+
+static int hid_tmff_event(struct hid_device *hid, struct input_dev *input,
+ unsigned int type, unsigned int code, int value)
+{
+ struct tmff_device *tmff = hid->ff_private;
+ struct tmff_effect *effect = &tmff->effects[code];
+ unsigned long flags;
+
+ if (type != EV_FF)
+ return -EINVAL;
+ if (!TMFF_CHECK_ID(code))
+ return -EINVAL;
+ if (!TMFF_CHECK_OWNERSHIP(code, tmff))
+ return -EACCES;
+ if (value < 0)
+ return -EINVAL;
+
+ spin_lock_irqsave(&tmff->lock, flags);
+
+ if (value > 0) {
+ set_bit(EFFECT_STARTED, effect->flags);
+ clear_bit(EFFECT_PLAYING, effect->flags);
+ effect->count = value;
+ effect->play_at = DELAY_CALC(jiffies, effect->effect.replay.delay);
+ } else {
+ clear_bit(EFFECT_STARTED, effect->flags);
+ clear_bit(EFFECT_PLAYING, effect->flags);
+ }
+
+ hid_tmff_recalculate_timer(tmff);
+
+ spin_unlock_irqrestore(&tmff->lock, flags);
+
+ return 0;
+
+}
+
+/* Erase all effects this process owns */
+
+static int hid_tmff_flush(struct input_dev *dev, struct file *file)
+{
+ struct hid_device *hid = dev->private;
+ struct tmff_device *tmff = hid->ff_private;
+ int i;
+
+ for (i=0; i<dev->ff_effects_max; ++i)
+
+ /* NOTE: no need to lock here. The only times EFFECT_USED is
+ modified is when effects are uploaded or when an effect is
+ erased. But a process cannot close its dev/input/eventX fd
+ and perform ioctls on the same fd all at the same time */
+
+ if (current->pid == tmff->effects[i].owner
+ && test_bit(EFFECT_USED, tmff->effects[i].flags))
+ if (hid_tmff_erase(dev, i))
+ warn("erase effect %d failed", i);
+
+
+ return 0;
+}
+
+static int hid_tmff_erase(struct input_dev *dev, int id)
+{
+ struct hid_device *hid = dev->private;
+ struct tmff_device *tmff = hid->ff_private;
+ unsigned long flags;
+
+ if (!TMFF_CHECK_ID(id))
+ return -EINVAL;
+ if (!TMFF_CHECK_OWNERSHIP(id, tmff))
+ return -EACCES;
+
+ spin_lock_irqsave(&tmff->lock, flags);
+
+ tmff->effects[id].flags[0] = 0;
+ hid_tmff_recalculate_timer(tmff);
+
+ spin_unlock_irqrestore(&tmff->lock, flags);
+
+ return 0;
+}
+
+static int hid_tmff_upload_effect(struct input_dev *input,
+ struct ff_effect *effect)
+{
+ struct hid_device *hid = input->private;
+ struct tmff_device *tmff = hid->ff_private;
+ int id;
+ unsigned long flags;
+
+ if (!test_bit(effect->type, input->ffbit))
+ return -EINVAL;
+ if (effect->id != -1 && !TMFF_CHECK_ID(effect->id))
+ return -EINVAL;
+
+ spin_lock_irqsave(&tmff->lock, flags);
+
+ if (effect->id == -1) {
+ /* Find a free effect */
+ for (id = 0; id < TMFF_EFFECTS && test_bit(EFFECT_USED, tmff->effects[id].flags); ++id);
+
+ if (id >= TMFF_EFFECTS) {
+ spin_unlock_irqrestore(&tmff->lock, flags);
+ return -ENOSPC;
+ }
+
+ effect->id = id;
+ tmff->effects[id].owner = current->pid;
+ tmff->effects[id].flags[0] = 0;
+ set_bit(EFFECT_USED, tmff->effects[id].flags);
+
+ } else {
+ /* Re-uploading an owned effect, to change parameters */
+ id = effect->id;
+ clear_bit(EFFECT_PLAYING, tmff->effects[id].flags);
+ }
+
+ tmff->effects[id].effect = *effect;
+
+ hid_tmff_recalculate_timer(tmff);
+
+ spin_unlock_irqrestore(&tmff->lock, flags);
+ return 0;
+}
+
+/* Start the timer for the next start/stop/delay */
+/* Always call this while tmff->lock is locked */
+
+static void hid_tmff_recalculate_timer(struct tmff_device *tmff)
+{
+ int i;
+ int events = 0;
+ unsigned long next_time;
+
+ next_time = 0; /* Shut up compiler's incorrect warning */
+
+ /* Find the next change in an effect's status */
+ for (i = 0; i < TMFF_EFFECTS; ++i) {
+ struct tmff_effect *effect = &tmff->effects[i];
+ unsigned long play_time;
+
+ if (!test_bit(EFFECT_STARTED, effect->flags))
+ continue;
+
+ effect->stop_at = DELAY_CALC(effect->play_at, effect->effect.replay.length);
+
+ if (!test_bit(EFFECT_PLAYING, effect->flags))
+ play_time = effect->play_at;
+ else
+ play_time = effect->stop_at;
+
+ events++;
+
+ if (time_after(jiffies, play_time))
+ play_time = jiffies;
+
+ if (events == 1)
+ next_time = play_time;
+ else {
+ if (time_after(next_time, play_time))
+ next_time = play_time;
+ }
+ }
+
+ if (!events && tmff->effects_playing) {
+ /* Treat all effects turning off as an event */
+ events = 1;
+ next_time = jiffies;
+ }
+
+ if (!events) {
+ /* No events, no time, no need for a timer. */
+ del_timer_sync(&tmff->timer);
+ return;
+ }
+
+ mod_timer(&tmff->timer, next_time);
+}
+
+/* Changes values from 0 to 0xffff into values from minimum to maximum */
+static inline int hid_tmff_scale(unsigned int in, int minimum, int maximum)
+{
+ int ret;
+
+ ret = (in * (maximum - minimum) / 0xffff) + minimum;
+ if (ret < minimum)
+ return minimum;
+ if (ret > maximum)
+ return maximum;
+ return ret;
+}
+
+static void hid_tmff_timer(unsigned long timer_data)
+{
+ struct tmff_device *tmff = (struct tmff_device *) timer_data;
+ struct hid_device *hid = tmff->hid;
+ unsigned long flags;
+ int left = 0, right = 0; /* Rumbling */
+ int i;
+
+ spin_lock_irqsave(&tmff->lock, flags);
+
+ tmff->effects_playing = 0;
+
+ for (i = 0; i < TMFF_EFFECTS; ++i) {
+ struct tmff_effect *effect = &tmff->effects[i];
+
+ if (!test_bit(EFFECT_STARTED, effect->flags))
+ continue;
+
+ if (!time_after(jiffies, effect->play_at))
+ continue;
+
+ if (time_after(jiffies, effect->stop_at)) {
+
+ dbg("Finished playing once %d", i);
+ clear_bit(EFFECT_PLAYING, effect->flags);
+
+ if (--effect->count <= 0) {
+ dbg("Stopped %d", i);
+ clear_bit(EFFECT_STARTED, effect->flags);
+ continue;
+ } else {
+ dbg("Start again %d", i);
+ effect->play_at = DELAY_CALC(jiffies, effect->effect.replay.delay);
+ continue;
+ }
+ }
+
+ ++tmff->effects_playing;
+
+ set_bit(EFFECT_PLAYING, effect->flags);
+
+ switch (effect->effect.type) {
+ case FF_RUMBLE:
+ right += effect->effect.u.rumble.strong_magnitude;
+ left += effect->effect.u.rumble.weak_magnitude;
+ break;
+ default:
+ BUG();
+ break;
+ }
+ }
+
+ left = hid_tmff_scale(left, tmff->rumble->logical_minimum, tmff->rumble->logical_maximum);
+ right = hid_tmff_scale(right, tmff->rumble->logical_minimum, tmff->rumble->logical_maximum);
+
+ if (left != tmff->rumble->value[0] || right != tmff->rumble->value[1]) {
+ tmff->rumble->value[0] = left;
+ tmff->rumble->value[1] = right;
+ dbg("(left,right)=(%08x, %08x)", left, right);
+ hid_submit_report(hid, tmff->report, USB_DIR_OUT);
+ }
+
+ if (!test_bit(DEVICE_CLOSING, tmff->flags))
+ hid_tmff_recalculate_timer(tmff);
+
+ spin_unlock_irqrestore(&tmff->lock, flags);
+}
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