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rcu: combine duplicate code, courtesy of CONFIG_PREEMPT_RCU
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / hid / usbhid / hid-pidff.c
blobef381d79cfa81e969b14fcb3fd62cabde2dbb272
1 /*
2 * Force feedback driver for USB HID PID compliant devices
3 *
4 * Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
5 */
6
7 /*
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 /* #define DEBUG */
24
25 #define debug(format, arg...) pr_debug("hid-pidff: " format "\n" , ## arg)
26
27 #include <linux/input.h>
28 #include <linux/slab.h>
29 #include <linux/usb.h>
30
31 #include <linux/hid.h>
32
33 #include "usbhid.h"
34
35 #define PID_EFFECTS_MAX 64
36
37 /* Report usage table used to put reports into an array */
38
39 #define PID_SET_EFFECT 0
40 #define PID_EFFECT_OPERATION 1
41 #define PID_DEVICE_GAIN 2
42 #define PID_POOL 3
43 #define PID_BLOCK_LOAD 4
44 #define PID_BLOCK_FREE 5
45 #define PID_DEVICE_CONTROL 6
46 #define PID_CREATE_NEW_EFFECT 7
47
48 #define PID_REQUIRED_REPORTS 7
49
50 #define PID_SET_ENVELOPE 8
51 #define PID_SET_CONDITION 9
52 #define PID_SET_PERIODIC 10
53 #define PID_SET_CONSTANT 11
54 #define PID_SET_RAMP 12
55 static const u8 pidff_reports[] = {
56 0x21, 0x77, 0x7d, 0x7f, 0x89, 0x90, 0x96, 0xab,
57 0x5a, 0x5f, 0x6e, 0x73, 0x74
58 };
59
60 /* device_control is really 0x95, but 0x96 specified as it is the usage of
61 the only field in that report */
62
63 /* Value usage tables used to put fields and values into arrays */
64
65 #define PID_EFFECT_BLOCK_INDEX 0
66
67 #define PID_DURATION 1
68 #define PID_GAIN 2
69 #define PID_TRIGGER_BUTTON 3
70 #define PID_TRIGGER_REPEAT_INT 4
71 #define PID_DIRECTION_ENABLE 5
72 #define PID_START_DELAY 6
73 static const u8 pidff_set_effect[] = {
74 0x22, 0x50, 0x52, 0x53, 0x54, 0x56, 0xa7
75 };
76
77 #define PID_ATTACK_LEVEL 1
78 #define PID_ATTACK_TIME 2
79 #define PID_FADE_LEVEL 3
80 #define PID_FADE_TIME 4
81 static const u8 pidff_set_envelope[] = { 0x22, 0x5b, 0x5c, 0x5d, 0x5e };
82
83 #define PID_PARAM_BLOCK_OFFSET 1
84 #define PID_CP_OFFSET 2
85 #define PID_POS_COEFFICIENT 3
86 #define PID_NEG_COEFFICIENT 4
87 #define PID_POS_SATURATION 5
88 #define PID_NEG_SATURATION 6
89 #define PID_DEAD_BAND 7
90 static const u8 pidff_set_condition[] = {
91 0x22, 0x23, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65
92 };
93
94 #define PID_MAGNITUDE 1
95 #define PID_OFFSET 2
96 #define PID_PHASE 3
97 #define PID_PERIOD 4
98 static const u8 pidff_set_periodic[] = { 0x22, 0x70, 0x6f, 0x71, 0x72 };
99 static const u8 pidff_set_constant[] = { 0x22, 0x70 };
100
101 #define PID_RAMP_START 1
102 #define PID_RAMP_END 2
103 static const u8 pidff_set_ramp[] = { 0x22, 0x75, 0x76 };
104
105 #define PID_RAM_POOL_AVAILABLE 1
106 static const u8 pidff_block_load[] = { 0x22, 0xac };
107
108 #define PID_LOOP_COUNT 1
109 static const u8 pidff_effect_operation[] = { 0x22, 0x7c };
110
111 static const u8 pidff_block_free[] = { 0x22 };
112
113 #define PID_DEVICE_GAIN_FIELD 0
114 static const u8 pidff_device_gain[] = { 0x7e };
115
116 #define PID_RAM_POOL_SIZE 0
117 #define PID_SIMULTANEOUS_MAX 1
118 #define PID_DEVICE_MANAGED_POOL 2
119 static const u8 pidff_pool[] = { 0x80, 0x83, 0xa9 };
120
121 /* Special field key tables used to put special field keys into arrays */
122
123 #define PID_ENABLE_ACTUATORS 0
124 #define PID_RESET 1
125 static const u8 pidff_device_control[] = { 0x97, 0x9a };
126
127 #define PID_CONSTANT 0
128 #define PID_RAMP 1
129 #define PID_SQUARE 2
130 #define PID_SINE 3
131 #define PID_TRIANGLE 4
132 #define PID_SAW_UP 5
133 #define PID_SAW_DOWN 6
134 #define PID_SPRING 7
135 #define PID_DAMPER 8
136 #define PID_INERTIA 9
137 #define PID_FRICTION 10
138 static const u8 pidff_effect_types[] = {
139 0x26, 0x27, 0x30, 0x31, 0x32, 0x33, 0x34,
140 0x40, 0x41, 0x42, 0x43
141 };
142
143 #define PID_BLOCK_LOAD_SUCCESS 0
144 #define PID_BLOCK_LOAD_FULL 1
145 static const u8 pidff_block_load_status[] = { 0x8c, 0x8d };
146
147 #define PID_EFFECT_START 0
148 #define PID_EFFECT_STOP 1
149 static const u8 pidff_effect_operation_status[] = { 0x79, 0x7b };
150
151 struct pidff_usage {
152 struct hid_field *field;
153 s32 *value;
154 };
155
156 struct pidff_device {
157 struct hid_device *hid;
158
159 struct hid_report *reports[sizeof(pidff_reports)];
160
161 struct pidff_usage set_effect[sizeof(pidff_set_effect)];
162 struct pidff_usage set_envelope[sizeof(pidff_set_envelope)];
163 struct pidff_usage set_condition[sizeof(pidff_set_condition)];
164 struct pidff_usage set_periodic[sizeof(pidff_set_periodic)];
165 struct pidff_usage set_constant[sizeof(pidff_set_constant)];
166 struct pidff_usage set_ramp[sizeof(pidff_set_ramp)];
167
168 struct pidff_usage device_gain[sizeof(pidff_device_gain)];
169 struct pidff_usage block_load[sizeof(pidff_block_load)];
170 struct pidff_usage pool[sizeof(pidff_pool)];
171 struct pidff_usage effect_operation[sizeof(pidff_effect_operation)];
172 struct pidff_usage block_free[sizeof(pidff_block_free)];
173
174 /* Special field is a field that is not composed of
175 usage<->value pairs that pidff_usage values are */
176
177 /* Special field in create_new_effect */
178 struct hid_field *create_new_effect_type;
179
180 /* Special fields in set_effect */
181 struct hid_field *set_effect_type;
182 struct hid_field *effect_direction;
183
184 /* Special field in device_control */
185 struct hid_field *device_control;
186
187 /* Special field in block_load */
188 struct hid_field *block_load_status;
189
190 /* Special field in effect_operation */
191 struct hid_field *effect_operation_status;
192
193 int control_id[sizeof(pidff_device_control)];
194 int type_id[sizeof(pidff_effect_types)];
195 int status_id[sizeof(pidff_block_load_status)];
196 int operation_id[sizeof(pidff_effect_operation_status)];
197
198 int pid_id[PID_EFFECTS_MAX];
199 };
200
201 /*
202 * Scale an unsigned value with range 0..max for the given field
203 */
204 static int pidff_rescale(int i, int max, struct hid_field *field)
205 {
206 return i * (field->logical_maximum - field->logical_minimum) / max +
207 field->logical_minimum;
208 }
209
210 /*
211 * Scale a signed value in range -0x8000..0x7fff for the given field
212 */
213 static int pidff_rescale_signed(int i, struct hid_field *field)
214 {
215 return i == 0 ? 0 : i >
216 0 ? i * field->logical_maximum / 0x7fff : i *
217 field->logical_minimum / -0x8000;
218 }
219
220 static void pidff_set(struct pidff_usage *usage, u16 value)
221 {
222 usage->value[0] = pidff_rescale(value, 0xffff, usage->field);
223 debug("calculated from %d to %d", value, usage->value[0]);
224 }
225
226 static void pidff_set_signed(struct pidff_usage *usage, s16 value)
227 {
228 if (usage->field->logical_minimum < 0)
229 usage->value[0] = pidff_rescale_signed(value, usage->field);
230 else {
231 if (value < 0)
232 usage->value[0] =
233 pidff_rescale(-value, 0x8000, usage->field);
234 else
235 usage->value[0] =
236 pidff_rescale(value, 0x7fff, usage->field);
237 }
238 debug("calculated from %d to %d", value, usage->value[0]);
239 }
240
241 /*
242 * Send envelope report to the device
243 */
244 static void pidff_set_envelope_report(struct pidff_device *pidff,
245 struct ff_envelope *envelope)
246 {
247 pidff->set_envelope[PID_EFFECT_BLOCK_INDEX].value[0] =
248 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
249
250 pidff->set_envelope[PID_ATTACK_LEVEL].value[0] =
251 pidff_rescale(envelope->attack_level >
252 0x7fff ? 0x7fff : envelope->attack_level, 0x7fff,
253 pidff->set_envelope[PID_ATTACK_LEVEL].field);
254 pidff->set_envelope[PID_FADE_LEVEL].value[0] =
255 pidff_rescale(envelope->fade_level >
256 0x7fff ? 0x7fff : envelope->fade_level, 0x7fff,
257 pidff->set_envelope[PID_FADE_LEVEL].field);
258
259 pidff->set_envelope[PID_ATTACK_TIME].value[0] = envelope->attack_length;
260 pidff->set_envelope[PID_FADE_TIME].value[0] = envelope->fade_length;
261
262 debug("attack %u => %d", envelope->attack_level,
263 pidff->set_envelope[PID_ATTACK_LEVEL].value[0]);
264
265 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_ENVELOPE],
266 USB_DIR_OUT);
267 }
268
269 /*
270 * Test if the new envelope differs from old one
271 */
272 static int pidff_needs_set_envelope(struct ff_envelope *envelope,
273 struct ff_envelope *old)
274 {
275 return envelope->attack_level != old->attack_level ||
276 envelope->fade_level != old->fade_level ||
277 envelope->attack_length != old->attack_length ||
278 envelope->fade_length != old->fade_length;
279 }
280
281 /*
282 * Send constant force report to the device
283 */
284 static void pidff_set_constant_force_report(struct pidff_device *pidff,
285 struct ff_effect *effect)
286 {
287 pidff->set_constant[PID_EFFECT_BLOCK_INDEX].value[0] =
288 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
289 pidff_set_signed(&pidff->set_constant[PID_MAGNITUDE],
290 effect->u.constant.level);
291
292 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_CONSTANT],
293 USB_DIR_OUT);
294 }
295
296 /*
297 * Test if the constant parameters have changed between effects
298 */
299 static int pidff_needs_set_constant(struct ff_effect *effect,
300 struct ff_effect *old)
301 {
302 return effect->u.constant.level != old->u.constant.level;
303 }
304
305 /*
306 * Send set effect report to the device
307 */
308 static void pidff_set_effect_report(struct pidff_device *pidff,
309 struct ff_effect *effect)
310 {
311 pidff->set_effect[PID_EFFECT_BLOCK_INDEX].value[0] =
312 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
313 pidff->set_effect_type->value[0] =
314 pidff->create_new_effect_type->value[0];
315 pidff->set_effect[PID_DURATION].value[0] = effect->replay.length;
316 pidff->set_effect[PID_TRIGGER_BUTTON].value[0] = effect->trigger.button;
317 pidff->set_effect[PID_TRIGGER_REPEAT_INT].value[0] =
318 effect->trigger.interval;
319 pidff->set_effect[PID_GAIN].value[0] =
320 pidff->set_effect[PID_GAIN].field->logical_maximum;
321 pidff->set_effect[PID_DIRECTION_ENABLE].value[0] = 1;
322 pidff->effect_direction->value[0] =
323 pidff_rescale(effect->direction, 0xffff,
324 pidff->effect_direction);
325 pidff->set_effect[PID_START_DELAY].value[0] = effect->replay.delay;
326
327 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_EFFECT],
328 USB_DIR_OUT);
329 }
330
331 /*
332 * Test if the values used in set_effect have changed
333 */
334 static int pidff_needs_set_effect(struct ff_effect *effect,
335 struct ff_effect *old)
336 {
337 return effect->replay.length != old->replay.length ||
338 effect->trigger.interval != old->trigger.interval ||
339 effect->trigger.button != old->trigger.button ||
340 effect->direction != old->direction ||
341 effect->replay.delay != old->replay.delay;
342 }
343
344 /*
345 * Send periodic effect report to the device
346 */
347 static void pidff_set_periodic_report(struct pidff_device *pidff,
348 struct ff_effect *effect)
349 {
350 pidff->set_periodic[PID_EFFECT_BLOCK_INDEX].value[0] =
351 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
352 pidff_set_signed(&pidff->set_periodic[PID_MAGNITUDE],
353 effect->u.periodic.magnitude);
354 pidff_set_signed(&pidff->set_periodic[PID_OFFSET],
355 effect->u.periodic.offset);
356 pidff_set(&pidff->set_periodic[PID_PHASE], effect->u.periodic.phase);
357 pidff->set_periodic[PID_PERIOD].value[0] = effect->u.periodic.period;
358
359 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_PERIODIC],
360 USB_DIR_OUT);
361
362 }
363
364 /*
365 * Test if periodic effect parameters have changed
366 */
367 static int pidff_needs_set_periodic(struct ff_effect *effect,
368 struct ff_effect *old)
369 {
370 return effect->u.periodic.magnitude != old->u.periodic.magnitude ||
371 effect->u.periodic.offset != old->u.periodic.offset ||
372 effect->u.periodic.phase != old->u.periodic.phase ||
373 effect->u.periodic.period != old->u.periodic.period;
374 }
375
376 /*
377 * Send condition effect reports to the device
378 */
379 static void pidff_set_condition_report(struct pidff_device *pidff,
380 struct ff_effect *effect)
381 {
382 int i;
383
384 pidff->set_condition[PID_EFFECT_BLOCK_INDEX].value[0] =
385 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
386
387 for (i = 0; i < 2; i++) {
388 pidff->set_condition[PID_PARAM_BLOCK_OFFSET].value[0] = i;
389 pidff_set_signed(&pidff->set_condition[PID_CP_OFFSET],
390 effect->u.condition[i].center);
391 pidff_set_signed(&pidff->set_condition[PID_POS_COEFFICIENT],
392 effect->u.condition[i].right_coeff);
393 pidff_set_signed(&pidff->set_condition[PID_NEG_COEFFICIENT],
394 effect->u.condition[i].left_coeff);
395 pidff_set(&pidff->set_condition[PID_POS_SATURATION],
396 effect->u.condition[i].right_saturation);
397 pidff_set(&pidff->set_condition[PID_NEG_SATURATION],
398 effect->u.condition[i].left_saturation);
399 pidff_set(&pidff->set_condition[PID_DEAD_BAND],
400 effect->u.condition[i].deadband);
401 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_CONDITION],
402 USB_DIR_OUT);
403 }
404 }
405
406 /*
407 * Test if condition effect parameters have changed
408 */
409 static int pidff_needs_set_condition(struct ff_effect *effect,
410 struct ff_effect *old)
411 {
412 int i;
413 int ret = 0;
414
415 for (i = 0; i < 2; i++) {
416 struct ff_condition_effect *cond = &effect->u.condition[i];
417 struct ff_condition_effect *old_cond = &old->u.condition[i];
418
419 ret |= cond->center != old_cond->center ||
420 cond->right_coeff != old_cond->right_coeff ||
421 cond->left_coeff != old_cond->left_coeff ||
422 cond->right_saturation != old_cond->right_saturation ||
423 cond->left_saturation != old_cond->left_saturation ||
424 cond->deadband != old_cond->deadband;
425 }
426
427 return ret;
428 }
429
430 /*
431 * Send ramp force report to the device
432 */
433 static void pidff_set_ramp_force_report(struct pidff_device *pidff,
434 struct ff_effect *effect)
435 {
436 pidff->set_ramp[PID_EFFECT_BLOCK_INDEX].value[0] =
437 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
438 pidff_set_signed(&pidff->set_ramp[PID_RAMP_START],
439 effect->u.ramp.start_level);
440 pidff_set_signed(&pidff->set_ramp[PID_RAMP_END],
441 effect->u.ramp.end_level);
442 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_RAMP],
443 USB_DIR_OUT);
444 }
445
446 /*
447 * Test if ramp force parameters have changed
448 */
449 static int pidff_needs_set_ramp(struct ff_effect *effect, struct ff_effect *old)
450 {
451 return effect->u.ramp.start_level != old->u.ramp.start_level ||
452 effect->u.ramp.end_level != old->u.ramp.end_level;
453 }
454
455 /*
456 * Send a request for effect upload to the device
457 *
458 * Returns 0 if device reported success, -ENOSPC if the device reported memory
459 * is full. Upon unknown response the function will retry for 60 times, if
460 * still unsuccessful -EIO is returned.
461 */
462 static int pidff_request_effect_upload(struct pidff_device *pidff, int efnum)
463 {
464 int j;
465
466 pidff->create_new_effect_type->value[0] = efnum;
467 usbhid_submit_report(pidff->hid, pidff->reports[PID_CREATE_NEW_EFFECT],
468 USB_DIR_OUT);
469 debug("create_new_effect sent, type: %d", efnum);
470
471 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] = 0;
472 pidff->block_load_status->value[0] = 0;
473 usbhid_wait_io(pidff->hid);
474
475 for (j = 0; j < 60; j++) {
476 debug("pid_block_load requested");
477 usbhid_submit_report(pidff->hid, pidff->reports[PID_BLOCK_LOAD],
478 USB_DIR_IN);
479 usbhid_wait_io(pidff->hid);
480 if (pidff->block_load_status->value[0] ==
481 pidff->status_id[PID_BLOCK_LOAD_SUCCESS]) {
482 debug("device reported free memory: %d bytes",
483 pidff->block_load[PID_RAM_POOL_AVAILABLE].value ?
484 pidff->block_load[PID_RAM_POOL_AVAILABLE].value[0] : -1);
485 return 0;
486 }
487 if (pidff->block_load_status->value[0] ==
488 pidff->status_id[PID_BLOCK_LOAD_FULL]) {
489 debug("not enough memory free: %d bytes",
490 pidff->block_load[PID_RAM_POOL_AVAILABLE].value ?
491 pidff->block_load[PID_RAM_POOL_AVAILABLE].value[0] : -1);
492 return -ENOSPC;
493 }
494 }
495 printk(KERN_ERR "hid-pidff: pid_block_load failed 60 times\n");
496 return -EIO;
497 }
498
499 /*
500 * Play the effect with PID id n times
501 */
502 static void pidff_playback_pid(struct pidff_device *pidff, int pid_id, int n)
503 {
504 pidff->effect_operation[PID_EFFECT_BLOCK_INDEX].value[0] = pid_id;
505
506 if (n == 0) {
507 pidff->effect_operation_status->value[0] =
508 pidff->operation_id[PID_EFFECT_STOP];
509 } else {
510 pidff->effect_operation_status->value[0] =
511 pidff->operation_id[PID_EFFECT_START];
512 pidff->effect_operation[PID_LOOP_COUNT].value[0] = n;
513 }
514
515 usbhid_submit_report(pidff->hid, pidff->reports[PID_EFFECT_OPERATION],
516 USB_DIR_OUT);
517 }
518
519 /**
520 * Play the effect with effect id @effect_id for @value times
521 */
522 static int pidff_playback(struct input_dev *dev, int effect_id, int value)
523 {
524 struct pidff_device *pidff = dev->ff->private;
525
526 pidff_playback_pid(pidff, pidff->pid_id[effect_id], value);
527
528 return 0;
529 }
530
531 /*
532 * Erase effect with PID id
533 */
534 static void pidff_erase_pid(struct pidff_device *pidff, int pid_id)
535 {
536 pidff->block_free[PID_EFFECT_BLOCK_INDEX].value[0] = pid_id;
537 usbhid_submit_report(pidff->hid, pidff->reports[PID_BLOCK_FREE],
538 USB_DIR_OUT);
539 }
540
541 /*
542 * Stop and erase effect with effect_id
543 */
544 static int pidff_erase_effect(struct input_dev *dev, int effect_id)
545 {
546 struct pidff_device *pidff = dev->ff->private;
547 int pid_id = pidff->pid_id[effect_id];
548
549 debug("starting to erase %d/%d", effect_id, pidff->pid_id[effect_id]);
550 /* Wait for the queue to clear. We do not want a full fifo to
551 prevent the effect removal. */
552 usbhid_wait_io(pidff->hid);
553 pidff_playback_pid(pidff, pid_id, 0);
554 pidff_erase_pid(pidff, pid_id);
555
556 return 0;
557 }
558
559 /*
560 * Effect upload handler
561 */
562 static int pidff_upload_effect(struct input_dev *dev, struct ff_effect *effect,
563 struct ff_effect *old)
564 {
565 struct pidff_device *pidff = dev->ff->private;
566 int type_id;
567 int error;
568
569 switch (effect->type) {
570 case FF_CONSTANT:
571 if (!old) {
572 error = pidff_request_effect_upload(pidff,
573 pidff->type_id[PID_CONSTANT]);
574 if (error)
575 return error;
576 }
577 if (!old || pidff_needs_set_effect(effect, old))
578 pidff_set_effect_report(pidff, effect);
579 if (!old || pidff_needs_set_constant(effect, old))
580 pidff_set_constant_force_report(pidff, effect);
581 if (!old ||
582 pidff_needs_set_envelope(&effect->u.constant.envelope,
583 &old->u.constant.envelope))
584 pidff_set_envelope_report(pidff,
585 &effect->u.constant.envelope);
586 break;
587
588 case FF_PERIODIC:
589 if (!old) {
590 switch (effect->u.periodic.waveform) {
591 case FF_SQUARE:
592 type_id = PID_SQUARE;
593 break;
594 case FF_TRIANGLE:
595 type_id = PID_TRIANGLE;
596 break;
597 case FF_SINE:
598 type_id = PID_SINE;
599 break;
600 case FF_SAW_UP:
601 type_id = PID_SAW_UP;
602 break;
603 case FF_SAW_DOWN:
604 type_id = PID_SAW_DOWN;
605 break;
606 default:
607 printk(KERN_ERR
608 "hid-pidff: invalid waveform\n");
609 return -EINVAL;
610 }
611
612 error = pidff_request_effect_upload(pidff,
613 pidff->type_id[type_id]);
614 if (error)
615 return error;
616 }
617 if (!old || pidff_needs_set_effect(effect, old))
618 pidff_set_effect_report(pidff, effect);
619 if (!old || pidff_needs_set_periodic(effect, old))
620 pidff_set_periodic_report(pidff, effect);
621 if (!old ||
622 pidff_needs_set_envelope(&effect->u.periodic.envelope,
623 &old->u.periodic.envelope))
624 pidff_set_envelope_report(pidff,
625 &effect->u.periodic.envelope);
626 break;
627
628 case FF_RAMP:
629 if (!old) {
630 error = pidff_request_effect_upload(pidff,
631 pidff->type_id[PID_RAMP]);
632 if (error)
633 return error;
634 }
635 if (!old || pidff_needs_set_effect(effect, old))
636 pidff_set_effect_report(pidff, effect);
637 if (!old || pidff_needs_set_ramp(effect, old))
638 pidff_set_ramp_force_report(pidff, effect);
639 if (!old ||
640 pidff_needs_set_envelope(&effect->u.ramp.envelope,
641 &old->u.ramp.envelope))
642 pidff_set_envelope_report(pidff,
643 &effect->u.ramp.envelope);
644 break;
645
646 case FF_SPRING:
647 if (!old) {
648 error = pidff_request_effect_upload(pidff,
649 pidff->type_id[PID_SPRING]);
650 if (error)
651 return error;
652 }
653 if (!old || pidff_needs_set_effect(effect, old))
654 pidff_set_effect_report(pidff, effect);
655 if (!old || pidff_needs_set_condition(effect, old))
656 pidff_set_condition_report(pidff, effect);
657 break;
658
659 case FF_FRICTION:
660 if (!old) {
661 error = pidff_request_effect_upload(pidff,
662 pidff->type_id[PID_FRICTION]);
663 if (error)
664 return error;
665 }
666 if (!old || pidff_needs_set_effect(effect, old))
667 pidff_set_effect_report(pidff, effect);
668 if (!old || pidff_needs_set_condition(effect, old))
669 pidff_set_condition_report(pidff, effect);
670 break;
671
672 case FF_DAMPER:
673 if (!old) {
674 error = pidff_request_effect_upload(pidff,
675 pidff->type_id[PID_DAMPER]);
676 if (error)
677 return error;
678 }
679 if (!old || pidff_needs_set_effect(effect, old))
680 pidff_set_effect_report(pidff, effect);
681 if (!old || pidff_needs_set_condition(effect, old))
682 pidff_set_condition_report(pidff, effect);
683 break;
684
685 case FF_INERTIA:
686 if (!old) {
687 error = pidff_request_effect_upload(pidff,
688 pidff->type_id[PID_INERTIA]);
689 if (error)
690 return error;
691 }
692 if (!old || pidff_needs_set_effect(effect, old))
693 pidff_set_effect_report(pidff, effect);
694 if (!old || pidff_needs_set_condition(effect, old))
695 pidff_set_condition_report(pidff, effect);
696 break;
697
698 default:
699 printk(KERN_ERR "hid-pidff: invalid type\n");
700 return -EINVAL;
701 }
702
703 if (!old)
704 pidff->pid_id[effect->id] =
705 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
706
707 debug("uploaded");
708
709 return 0;
710 }
711
712 /*
713 * set_gain() handler
714 */
715 static void pidff_set_gain(struct input_dev *dev, u16 gain)
716 {
717 struct pidff_device *pidff = dev->ff->private;
718
719 pidff_set(&pidff->device_gain[PID_DEVICE_GAIN_FIELD], gain);
720 usbhid_submit_report(pidff->hid, pidff->reports[PID_DEVICE_GAIN],
721 USB_DIR_OUT);
722 }
723
724 static void pidff_autocenter(struct pidff_device *pidff, u16 magnitude)
725 {
726 struct hid_field *field =
727 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field;
728
729 if (!magnitude) {
730 pidff_playback_pid(pidff, field->logical_minimum, 0);
731 return;
732 }
733
734 pidff_playback_pid(pidff, field->logical_minimum, 1);
735
736 pidff->set_effect[PID_EFFECT_BLOCK_INDEX].value[0] =
737 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum;
738 pidff->set_effect_type->value[0] = pidff->type_id[PID_SPRING];
739 pidff->set_effect[PID_DURATION].value[0] = 0;
740 pidff->set_effect[PID_TRIGGER_BUTTON].value[0] = 0;
741 pidff->set_effect[PID_TRIGGER_REPEAT_INT].value[0] = 0;
742 pidff_set(&pidff->set_effect[PID_GAIN], magnitude);
743 pidff->set_effect[PID_DIRECTION_ENABLE].value[0] = 1;
744 pidff->set_effect[PID_START_DELAY].value[0] = 0;
745
746 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_EFFECT],
747 USB_DIR_OUT);
748 }
749
750 /*
751 * pidff_set_autocenter() handler
752 */
753 static void pidff_set_autocenter(struct input_dev *dev, u16 magnitude)
754 {
755 struct pidff_device *pidff = dev->ff->private;
756
757 pidff_autocenter(pidff, magnitude);
758 }
759
760 /*
761 * Find fields from a report and fill a pidff_usage
762 */
763 static int pidff_find_fields(struct pidff_usage *usage, const u8 *table,
764 struct hid_report *report, int count, int strict)
765 {
766 int i, j, k, found;
767
768 for (k = 0; k < count; k++) {
769 found = 0;
770 for (i = 0; i < report->maxfield; i++) {
771 if (report->field[i]->maxusage !=
772 report->field[i]->report_count) {
773 debug("maxusage and report_count do not match, "
774 "skipping");
775 continue;
776 }
777 for (j = 0; j < report->field[i]->maxusage; j++) {
778 if (report->field[i]->usage[j].hid ==
779 (HID_UP_PID | table[k])) {
780 debug("found %d at %d->%d", k, i, j);
781 usage[k].field = report->field[i];
782 usage[k].value =
783 &report->field[i]->value[j];
784 found = 1;
785 break;
786 }
787 }
788 if (found)
789 break;
790 }
791 if (!found && strict) {
792 debug("failed to locate %d", k);
793 return -1;
794 }
795 }
796 return 0;
797 }
798
799 /*
800 * Return index into pidff_reports for the given usage
801 */
802 static int pidff_check_usage(int usage)
803 {
804 int i;
805
806 for (i = 0; i < sizeof(pidff_reports); i++)
807 if (usage == (HID_UP_PID | pidff_reports[i]))
808 return i;
809
810 return -1;
811 }
812
813 /*
814 * Find the reports and fill pidff->reports[]
815 * report_type specifies either OUTPUT or FEATURE reports
816 */
817 static void pidff_find_reports(struct hid_device *hid, int report_type,
818 struct pidff_device *pidff)
819 {
820 struct hid_report *report;
821 int i, ret;
822
823 list_for_each_entry(report,
824 &hid->report_enum[report_type].report_list, list) {
825 if (report->maxfield < 1)
826 continue;
827 ret = pidff_check_usage(report->field[0]->logical);
828 if (ret != -1) {
829 debug("found usage 0x%02x from field->logical",
830 pidff_reports[ret]);
831 pidff->reports[ret] = report;
832 continue;
833 }
834
835 /*
836 * Sometimes logical collections are stacked to indicate
837 * different usages for the report and the field, in which
838 * case we want the usage of the parent. However, Linux HID
839 * implementation hides this fact, so we have to dig it up
840 * ourselves
841 */
842 i = report->field[0]->usage[0].collection_index;
843 if (i <= 0 ||
844 hid->collection[i - 1].type != HID_COLLECTION_LOGICAL)
845 continue;
846 ret = pidff_check_usage(hid->collection[i - 1].usage);
847 if (ret != -1 && !pidff->reports[ret]) {
848 debug("found usage 0x%02x from collection array",
849 pidff_reports[ret]);
850 pidff->reports[ret] = report;
851 }
852 }
853 }
854
855 /*
856 * Test if the required reports have been found
857 */
858 static int pidff_reports_ok(struct pidff_device *pidff)
859 {
860 int i;
861
862 for (i = 0; i <= PID_REQUIRED_REPORTS; i++) {
863 if (!pidff->reports[i]) {
864 debug("%d missing", i);
865 return 0;
866 }
867 }
868
869 return 1;
870 }
871
872 /*
873 * Find a field with a specific usage within a report
874 */
875 static struct hid_field *pidff_find_special_field(struct hid_report *report,
876 int usage, int enforce_min)
877 {
878 int i;
879
880 for (i = 0; i < report->maxfield; i++) {
881 if (report->field[i]->logical == (HID_UP_PID | usage) &&
882 report->field[i]->report_count > 0) {
883 if (!enforce_min ||
884 report->field[i]->logical_minimum == 1)
885 return report->field[i];
886 else {
887 printk(KERN_ERR "hid-pidff: logical_minimum "
888 "is not 1 as it should be\n");
889 return NULL;
890 }
891 }
892 }
893 return NULL;
894 }
895
896 /*
897 * Fill a pidff->*_id struct table
898 */
899 static int pidff_find_special_keys(int *keys, struct hid_field *fld,
900 const u8 *usagetable, int count)
901 {
902
903 int i, j;
904 int found = 0;
905
906 for (i = 0; i < count; i++) {
907 for (j = 0; j < fld->maxusage; j++) {
908 if (fld->usage[j].hid == (HID_UP_PID | usagetable[i])) {
909 keys[i] = j + 1;
910 found++;
911 break;
912 }
913 }
914 }
915 return found;
916 }
917
918 #define PIDFF_FIND_SPECIAL_KEYS(keys, field, name) \
919 pidff_find_special_keys(pidff->keys, pidff->field, pidff_ ## name, \
920 sizeof(pidff_ ## name))
921
922 /*
923 * Find and check the special fields
924 */
925 static int pidff_find_special_fields(struct pidff_device *pidff)
926 {
927 debug("finding special fields");
928
929 pidff->create_new_effect_type =
930 pidff_find_special_field(pidff->reports[PID_CREATE_NEW_EFFECT],
931 0x25, 1);
932 pidff->set_effect_type =
933 pidff_find_special_field(pidff->reports[PID_SET_EFFECT],
934 0x25, 1);
935 pidff->effect_direction =
936 pidff_find_special_field(pidff->reports[PID_SET_EFFECT],
937 0x57, 0);
938 pidff->device_control =
939 pidff_find_special_field(pidff->reports[PID_DEVICE_CONTROL],
940 0x96, 1);
941 pidff->block_load_status =
942 pidff_find_special_field(pidff->reports[PID_BLOCK_LOAD],
943 0x8b, 1);
944 pidff->effect_operation_status =
945 pidff_find_special_field(pidff->reports[PID_EFFECT_OPERATION],
946 0x78, 1);
947
948 debug("search done");
949
950 if (!pidff->create_new_effect_type || !pidff->set_effect_type) {
951 printk(KERN_ERR "hid-pidff: effect lists not found\n");
952 return -1;
953 }
954
955 if (!pidff->effect_direction) {
956 printk(KERN_ERR "hid-pidff: direction field not found\n");
957 return -1;
958 }
959
960 if (!pidff->device_control) {
961 printk(KERN_ERR "hid-pidff: device control field not found\n");
962 return -1;
963 }
964
965 if (!pidff->block_load_status) {
966 printk(KERN_ERR
967 "hid-pidff: block load status field not found\n");
968 return -1;
969 }
970
971 if (!pidff->effect_operation_status) {
972 printk(KERN_ERR
973 "hid-pidff: effect operation field not found\n");
974 return -1;
975 }
976
977 pidff_find_special_keys(pidff->control_id, pidff->device_control,
978 pidff_device_control,
979 sizeof(pidff_device_control));
980
981 PIDFF_FIND_SPECIAL_KEYS(control_id, device_control, device_control);
982
983 if (!PIDFF_FIND_SPECIAL_KEYS(type_id, create_new_effect_type,
984 effect_types)) {
985 printk(KERN_ERR "hid-pidff: no effect types found\n");
986 return -1;
987 }
988
989 if (PIDFF_FIND_SPECIAL_KEYS(status_id, block_load_status,
990 block_load_status) !=
991 sizeof(pidff_block_load_status)) {
992 printk(KERN_ERR
993 "hidpidff: block load status identifiers not found\n");
994 return -1;
995 }
996
997 if (PIDFF_FIND_SPECIAL_KEYS(operation_id, effect_operation_status,
998 effect_operation_status) !=
999 sizeof(pidff_effect_operation_status)) {
1000 printk(KERN_ERR
1001 "hidpidff: effect operation identifiers not found\n");
1002 return -1;
1003 }
1004
1005 return 0;
1006 }
1007
1008 /**
1009 * Find the implemented effect types
1010 */
1011 static int pidff_find_effects(struct pidff_device *pidff,
1012 struct input_dev *dev)
1013 {
1014 int i;
1015
1016 for (i = 0; i < sizeof(pidff_effect_types); i++) {
1017 int pidff_type = pidff->type_id[i];
1018 if (pidff->set_effect_type->usage[pidff_type].hid !=
1019 pidff->create_new_effect_type->usage[pidff_type].hid) {
1020 printk(KERN_ERR "hid-pidff: "
1021 "effect type number %d is invalid\n", i);
1022 return -1;
1023 }
1024 }
1025
1026 if (pidff->type_id[PID_CONSTANT])
1027 set_bit(FF_CONSTANT, dev->ffbit);
1028 if (pidff->type_id[PID_RAMP])
1029 set_bit(FF_RAMP, dev->ffbit);
1030 if (pidff->type_id[PID_SQUARE]) {
1031 set_bit(FF_SQUARE, dev->ffbit);
1032 set_bit(FF_PERIODIC, dev->ffbit);
1033 }
1034 if (pidff->type_id[PID_SINE]) {
1035 set_bit(FF_SINE, dev->ffbit);
1036 set_bit(FF_PERIODIC, dev->ffbit);
1037 }
1038 if (pidff->type_id[PID_TRIANGLE]) {
1039 set_bit(FF_TRIANGLE, dev->ffbit);
1040 set_bit(FF_PERIODIC, dev->ffbit);
1041 }
1042 if (pidff->type_id[PID_SAW_UP]) {
1043 set_bit(FF_SAW_UP, dev->ffbit);
1044 set_bit(FF_PERIODIC, dev->ffbit);
1045 }
1046 if (pidff->type_id[PID_SAW_DOWN]) {
1047 set_bit(FF_SAW_DOWN, dev->ffbit);
1048 set_bit(FF_PERIODIC, dev->ffbit);
1049 }
1050 if (pidff->type_id[PID_SPRING])
1051 set_bit(FF_SPRING, dev->ffbit);
1052 if (pidff->type_id[PID_DAMPER])
1053 set_bit(FF_DAMPER, dev->ffbit);
1054 if (pidff->type_id[PID_INERTIA])
1055 set_bit(FF_INERTIA, dev->ffbit);
1056 if (pidff->type_id[PID_FRICTION])
1057 set_bit(FF_FRICTION, dev->ffbit);
1058
1059 return 0;
1060
1061 }
1062
1063 #define PIDFF_FIND_FIELDS(name, report, strict) \
1064 pidff_find_fields(pidff->name, pidff_ ## name, \
1065 pidff->reports[report], \
1066 sizeof(pidff_ ## name), strict)
1067
1068 /*
1069 * Fill and check the pidff_usages
1070 */
1071 static int pidff_init_fields(struct pidff_device *pidff, struct input_dev *dev)
1072 {
1073 int envelope_ok = 0;
1074
1075 if (PIDFF_FIND_FIELDS(set_effect, PID_SET_EFFECT, 1)) {
1076 printk(KERN_ERR
1077 "hid-pidff: unknown set_effect report layout\n");
1078 return -ENODEV;
1079 }
1080
1081 PIDFF_FIND_FIELDS(block_load, PID_BLOCK_LOAD, 0);
1082 if (!pidff->block_load[PID_EFFECT_BLOCK_INDEX].value) {
1083 printk(KERN_ERR
1084 "hid-pidff: unknown pid_block_load report layout\n");
1085 return -ENODEV;
1086 }
1087
1088 if (PIDFF_FIND_FIELDS(effect_operation, PID_EFFECT_OPERATION, 1)) {
1089 printk(KERN_ERR
1090 "hid-pidff: unknown effect_operation report layout\n");
1091 return -ENODEV;
1092 }
1093
1094 if (PIDFF_FIND_FIELDS(block_free, PID_BLOCK_FREE, 1)) {
1095 printk(KERN_ERR
1096 "hid-pidff: unknown pid_block_free report layout\n");
1097 return -ENODEV;
1098 }
1099
1100 if (!PIDFF_FIND_FIELDS(set_envelope, PID_SET_ENVELOPE, 1))
1101 envelope_ok = 1;
1102
1103 if (pidff_find_special_fields(pidff) || pidff_find_effects(pidff, dev))
1104 return -ENODEV;
1105
1106 if (!envelope_ok) {
1107 if (test_and_clear_bit(FF_CONSTANT, dev->ffbit))
1108 printk(KERN_WARNING "hid-pidff: "
1109 "has constant effect but no envelope\n");
1110 if (test_and_clear_bit(FF_RAMP, dev->ffbit))
1111 printk(KERN_WARNING "hid-pidff: "
1112 "has ramp effect but no envelope\n");
1113
1114 if (test_and_clear_bit(FF_PERIODIC, dev->ffbit))
1115 printk(KERN_WARNING "hid-pidff: "
1116 "has periodic effect but no envelope\n");
1117 }
1118
1119 if (test_bit(FF_CONSTANT, dev->ffbit) &&
1120 PIDFF_FIND_FIELDS(set_constant, PID_SET_CONSTANT, 1)) {
1121 printk(KERN_WARNING
1122 "hid-pidff: unknown constant effect layout\n");
1123 clear_bit(FF_CONSTANT, dev->ffbit);
1124 }
1125
1126 if (test_bit(FF_RAMP, dev->ffbit) &&
1127 PIDFF_FIND_FIELDS(set_ramp, PID_SET_RAMP, 1)) {
1128 printk(KERN_WARNING "hid-pidff: unknown ramp effect layout\n");
1129 clear_bit(FF_RAMP, dev->ffbit);
1130 }
1131
1132 if ((test_bit(FF_SPRING, dev->ffbit) ||
1133 test_bit(FF_DAMPER, dev->ffbit) ||
1134 test_bit(FF_FRICTION, dev->ffbit) ||
1135 test_bit(FF_INERTIA, dev->ffbit)) &&
1136 PIDFF_FIND_FIELDS(set_condition, PID_SET_CONDITION, 1)) {
1137 printk(KERN_WARNING
1138 "hid-pidff: unknown condition effect layout\n");
1139 clear_bit(FF_SPRING, dev->ffbit);
1140 clear_bit(FF_DAMPER, dev->ffbit);
1141 clear_bit(FF_FRICTION, dev->ffbit);
1142 clear_bit(FF_INERTIA, dev->ffbit);
1143 }
1144
1145 if (test_bit(FF_PERIODIC, dev->ffbit) &&
1146 PIDFF_FIND_FIELDS(set_periodic, PID_SET_PERIODIC, 1)) {
1147 printk(KERN_WARNING
1148 "hid-pidff: unknown periodic effect layout\n");
1149 clear_bit(FF_PERIODIC, dev->ffbit);
1150 }
1151
1152 PIDFF_FIND_FIELDS(pool, PID_POOL, 0);
1153
1154 if (!PIDFF_FIND_FIELDS(device_gain, PID_DEVICE_GAIN, 1))
1155 set_bit(FF_GAIN, dev->ffbit);
1156
1157 return 0;
1158 }
1159
1160 /*
1161 * Reset the device
1162 */
1163 static void pidff_reset(struct pidff_device *pidff)
1164 {
1165 struct hid_device *hid = pidff->hid;
1166 int i = 0;
1167
1168 pidff->device_control->value[0] = pidff->control_id[PID_RESET];
1169 /* We reset twice as sometimes hid_wait_io isn't waiting long enough */
1170 usbhid_submit_report(hid, pidff->reports[PID_DEVICE_CONTROL], USB_DIR_OUT);
1171 usbhid_wait_io(hid);
1172 usbhid_submit_report(hid, pidff->reports[PID_DEVICE_CONTROL], USB_DIR_OUT);
1173 usbhid_wait_io(hid);
1174
1175 pidff->device_control->value[0] =
1176 pidff->control_id[PID_ENABLE_ACTUATORS];
1177 usbhid_submit_report(hid, pidff->reports[PID_DEVICE_CONTROL], USB_DIR_OUT);
1178 usbhid_wait_io(hid);
1179
1180 /* pool report is sometimes messed up, refetch it */
1181 usbhid_submit_report(hid, pidff->reports[PID_POOL], USB_DIR_IN);
1182 usbhid_wait_io(hid);
1183
1184 if (pidff->pool[PID_SIMULTANEOUS_MAX].value) {
1185 while (pidff->pool[PID_SIMULTANEOUS_MAX].value[0] < 2) {
1186 if (i++ > 20) {
1187 printk(KERN_WARNING "hid-pidff: device reports "
1188 "%d simultaneous effects\n",
1189 pidff->pool[PID_SIMULTANEOUS_MAX].value[0]);
1190 break;
1191 }
1192 debug("pid_pool requested again");
1193 usbhid_submit_report(hid, pidff->reports[PID_POOL],
1194 USB_DIR_IN);
1195 usbhid_wait_io(hid);
1196 }
1197 }
1198 }
1199
1200 /*
1201 * Test if autocenter modification is using the supported method
1202 */
1203 static int pidff_check_autocenter(struct pidff_device *pidff,
1204 struct input_dev *dev)
1205 {
1206 int error;
1207
1208 /*
1209 * Let's find out if autocenter modification is supported
1210 * Specification doesn't specify anything, so we request an
1211 * effect upload and cancel it immediately. If the approved
1212 * effect id was one above the minimum, then we assume the first
1213 * effect id is a built-in spring type effect used for autocenter
1214 */
1215
1216 error = pidff_request_effect_upload(pidff, 1);
1217 if (error) {
1218 printk(KERN_ERR "hid-pidff: upload request failed\n");
1219 return error;
1220 }
1221
1222 if (pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] ==
1223 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum + 1) {
1224 pidff_autocenter(pidff, 0xffff);
1225 set_bit(FF_AUTOCENTER, dev->ffbit);
1226 } else {
1227 printk(KERN_NOTICE "hid-pidff: "
1228 "device has unknown autocenter control method\n");
1229 }
1230
1231 pidff_erase_pid(pidff,
1232 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0]);
1233
1234 return 0;
1235
1236 }
1237
1238 /*
1239 * Check if the device is PID and initialize it
1240 */
1241 int hid_pidff_init(struct hid_device *hid)
1242 {
1243 struct pidff_device *pidff;
1244 struct hid_input *hidinput = list_entry(hid->inputs.next,
1245 struct hid_input, list);
1246 struct input_dev *dev = hidinput->input;
1247 struct ff_device *ff;
1248 int max_effects;
1249 int error;
1250
1251 debug("starting pid init");
1252
1253 if (list_empty(&hid->report_enum[HID_OUTPUT_REPORT].report_list)) {
1254 debug("not a PID device, no output report");
1255 return -ENODEV;
1256 }
1257
1258 pidff = kzalloc(sizeof(*pidff), GFP_KERNEL);
1259 if (!pidff)
1260 return -ENOMEM;
1261
1262 pidff->hid = hid;
1263
1264 pidff_find_reports(hid, HID_OUTPUT_REPORT, pidff);
1265 pidff_find_reports(hid, HID_FEATURE_REPORT, pidff);
1266
1267 if (!pidff_reports_ok(pidff)) {
1268 debug("reports not ok, aborting");
1269 error = -ENODEV;
1270 goto fail;
1271 }
1272
1273 error = pidff_init_fields(pidff, dev);
1274 if (error)
1275 goto fail;
1276
1277 pidff_reset(pidff);
1278
1279 if (test_bit(FF_GAIN, dev->ffbit)) {
1280 pidff_set(&pidff->device_gain[PID_DEVICE_GAIN_FIELD], 0xffff);
1281 usbhid_submit_report(pidff->hid, pidff->reports[PID_DEVICE_GAIN],
1282 USB_DIR_OUT);
1283 }
1284
1285 error = pidff_check_autocenter(pidff, dev);
1286 if (error)
1287 goto fail;
1288
1289 max_effects =
1290 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_maximum -
1291 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum +
1292 1;
1293 debug("max effects is %d", max_effects);
1294
1295 if (max_effects > PID_EFFECTS_MAX)
1296 max_effects = PID_EFFECTS_MAX;
1297
1298 if (pidff->pool[PID_SIMULTANEOUS_MAX].value)
1299 debug("max simultaneous effects is %d",
1300 pidff->pool[PID_SIMULTANEOUS_MAX].value[0]);
1301
1302 if (pidff->pool[PID_RAM_POOL_SIZE].value)
1303 debug("device memory size is %d bytes",
1304 pidff->pool[PID_RAM_POOL_SIZE].value[0]);
1305
1306 if (pidff->pool[PID_DEVICE_MANAGED_POOL].value &&
1307 pidff->pool[PID_DEVICE_MANAGED_POOL].value[0] == 0) {
1308 printk(KERN_NOTICE "hid-pidff: "
1309 "device does not support device managed pool\n");
1310 goto fail;
1311 }
1312
1313 error = input_ff_create(dev, max_effects);
1314 if (error)
1315 goto fail;
1316
1317 ff = dev->ff;
1318 ff->private = pidff;
1319 ff->upload = pidff_upload_effect;
1320 ff->erase = pidff_erase_effect;
1321 ff->set_gain = pidff_set_gain;
1322 ff->set_autocenter = pidff_set_autocenter;
1323 ff->playback = pidff_playback;
1324
1325 printk(KERN_INFO "Force feedback for USB HID PID devices by "
1326 "Anssi Hannula <anssi.hannula@gmail.com>\n");
1327
1328 return 0;
1329
1330 fail:
1331 kfree(pidff);
1332 return error;
1333 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree