1 files changed, 463 insertions, 0 deletions

diff --git a/drivers/usb/input/hid-tmff.c b/drivers/usb/input/hid-tmff.c
new file mode 100644
index 000000000000..8f6a0a6f94a9
--- /dev/null
+++ b/drivers/usb/input/hid-tmff.c
@@ -0,0 +1,463 @@
+/*
+ * 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;
+	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
+
+	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, hidinput->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 */
+			hidinput->input.upload_effect = hid_tmff_upload_effect;
+			hidinput->input.flush = hid_tmff_flush;
+
+			set_bit(EV_FF, hidinput->input.evbit);
+			hidinput->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);
+}