aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/usb/input/hid-tmff.c
blob: 8f6a0a6f94a9bd7242ee7cb551311ac370cffc3d (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
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);
}