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ACPI: check a return value correctly in acpi_power_get_context()
[linux-2.6.22.y-op.git] / drivers / hid / usbhid / hid-pidff.c
blobf5a90e950e6b54cfcd48381f89d8b38e141b1aea
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/usb.h>
29
30 #include <linux/hid.h>
31
32 #include "usbhid.h"
33
34 #define PID_EFFECTS_MAX 64
35
36 /* Report usage table used to put reports into an array */
37
38 #define PID_SET_EFFECT 0
39 #define PID_EFFECT_OPERATION 1
40 #define PID_DEVICE_GAIN 2
41 #define PID_POOL 3
42 #define PID_BLOCK_LOAD 4
43 #define PID_BLOCK_FREE 5
44 #define PID_DEVICE_CONTROL 6
45 #define PID_CREATE_NEW_EFFECT 7
46
47 #define PID_REQUIRED_REPORTS 7
48
49 #define PID_SET_ENVELOPE 8
50 #define PID_SET_CONDITION 9
51 #define PID_SET_PERIODIC 10
52 #define PID_SET_CONSTANT 11
53 #define PID_SET_RAMP 12
54 static const u8 pidff_reports[] = {
55 0x21, 0x77, 0x7d, 0x7f, 0x89, 0x90, 0x96, 0xab,
56 0x5a, 0x5f, 0x6e, 0x73, 0x74
57 };
58
59 /* device_control is really 0x95, but 0x96 specified as it is the usage of
60 the only field in that report */
61
62 /* Value usage tables used to put fields and values into arrays */
63
64 #define PID_EFFECT_BLOCK_INDEX 0
65
66 #define PID_DURATION 1
67 #define PID_GAIN 2
68 #define PID_TRIGGER_BUTTON 3
69 #define PID_TRIGGER_REPEAT_INT 4
70 #define PID_DIRECTION_ENABLE 5
71 #define PID_START_DELAY 6
72 static const u8 pidff_set_effect[] = {
73 0x22, 0x50, 0x52, 0x53, 0x54, 0x56, 0xa7
74 };
75
76 #define PID_ATTACK_LEVEL 1
77 #define PID_ATTACK_TIME 2
78 #define PID_FADE_LEVEL 3
79 #define PID_FADE_TIME 4
80 static const u8 pidff_set_envelope[] = { 0x22, 0x5b, 0x5c, 0x5d, 0x5e };
81
82 #define PID_PARAM_BLOCK_OFFSET 1
83 #define PID_CP_OFFSET 2
84 #define PID_POS_COEFFICIENT 3
85 #define PID_NEG_COEFFICIENT 4
86 #define PID_POS_SATURATION 5
87 #define PID_NEG_SATURATION 6
88 #define PID_DEAD_BAND 7
89 static const u8 pidff_set_condition[] = {
90 0x22, 0x23, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65
91 };
92
93 #define PID_MAGNITUDE 1
94 #define PID_OFFSET 2
95 #define PID_PHASE 3
96 #define PID_PERIOD 4
97 static const u8 pidff_set_periodic[] = { 0x22, 0x70, 0x6f, 0x71, 0x72 };
98 static const u8 pidff_set_constant[] = { 0x22, 0x70 };
99
100 #define PID_RAMP_START 1
101 #define PID_RAMP_END 2
102 static const u8 pidff_set_ramp[] = { 0x22, 0x75, 0x76 };
103
104 #define PID_RAM_POOL_AVAILABLE 1
105 static const u8 pidff_block_load[] = { 0x22, 0xac };
106
107 #define PID_LOOP_COUNT 1
108 static const u8 pidff_effect_operation[] = { 0x22, 0x7c };
109
110 static const u8 pidff_block_free[] = { 0x22 };
111
112 #define PID_DEVICE_GAIN_FIELD 0
113 static const u8 pidff_device_gain[] = { 0x7e };
114
115 #define PID_RAM_POOL_SIZE 0
116 #define PID_SIMULTANEOUS_MAX 1
117 #define PID_DEVICE_MANAGED_POOL 2
118 static const u8 pidff_pool[] = { 0x80, 0x83, 0xa9 };
119
120 /* Special field key tables used to put special field keys into arrays */
121
122 #define PID_ENABLE_ACTUATORS 0
123 #define PID_RESET 1
124 static const u8 pidff_device_control[] = { 0x97, 0x9a };
125
126 #define PID_CONSTANT 0
127 #define PID_RAMP 1
128 #define PID_SQUARE 2
129 #define PID_SINE 3
130 #define PID_TRIANGLE 4
131 #define PID_SAW_UP 5
132 #define PID_SAW_DOWN 6
133 #define PID_SPRING 7
134 #define PID_DAMPER 8
135 #define PID_INERTIA 9
136 #define PID_FRICTION 10
137 static const u8 pidff_effect_types[] = {
138 0x26, 0x27, 0x30, 0x31, 0x32, 0x33, 0x34,
139 0x40, 0x41, 0x42, 0x43
140 };
141
142 #define PID_BLOCK_LOAD_SUCCESS 0
143 #define PID_BLOCK_LOAD_FULL 1
144 static const u8 pidff_block_load_status[] = { 0x8c, 0x8d };
145
146 #define PID_EFFECT_START 0
147 #define PID_EFFECT_STOP 1
148 static const u8 pidff_effect_operation_status[] = { 0x79, 0x7b };
149
150 struct pidff_usage {
151 struct hid_field *field;
152 s32 *value;
153 };
154
155 struct pidff_device {
156 struct hid_device *hid;
157
158 struct hid_report *reports[sizeof(pidff_reports)];
159
160 struct pidff_usage set_effect[sizeof(pidff_set_effect)];
161 struct pidff_usage set_envelope[sizeof(pidff_set_envelope)];
162 struct pidff_usage set_condition[sizeof(pidff_set_condition)];
163 struct pidff_usage set_periodic[sizeof(pidff_set_periodic)];
164 struct pidff_usage set_constant[sizeof(pidff_set_constant)];
165 struct pidff_usage set_ramp[sizeof(pidff_set_ramp)];
166
167 struct pidff_usage device_gain[sizeof(pidff_device_gain)];
168 struct pidff_usage block_load[sizeof(pidff_block_load)];
169 struct pidff_usage pool[sizeof(pidff_pool)];
170 struct pidff_usage effect_operation[sizeof(pidff_effect_operation)];
171 struct pidff_usage block_free[sizeof(pidff_block_free)];
172
173 /* Special field is a field that is not composed of
174 usage<->value pairs that pidff_usage values are */
175
176 /* Special field in create_new_effect */
177 struct hid_field *create_new_effect_type;
178
179 /* Special fields in set_effect */
180 struct hid_field *set_effect_type;
181 struct hid_field *effect_direction;
182
183 /* Special field in device_control */
184 struct hid_field *device_control;
185
186 /* Special field in block_load */
187 struct hid_field *block_load_status;
188
189 /* Special field in effect_operation */
190 struct hid_field *effect_operation_status;
191
192 int control_id[sizeof(pidff_device_control)];
193 int type_id[sizeof(pidff_effect_types)];
194 int status_id[sizeof(pidff_block_load_status)];
195 int operation_id[sizeof(pidff_effect_operation_status)];
196
197 int pid_id[PID_EFFECTS_MAX];
198 };
199
200 /*
201 * Scale an unsigned value with range 0..max for the given field
202 */
203 static int pidff_rescale(int i, int max, struct hid_field *field)
204 {
205 return i * (field->logical_maximum - field->logical_minimum) / max +
206 field->logical_minimum;
207 }
208
209 /*
210 * Scale a signed value in range -0x8000..0x7fff for the given field
211 */
212 static int pidff_rescale_signed(int i, struct hid_field *field)
213 {
214 return i == 0 ? 0 : i >
215 0 ? i * field->logical_maximum / 0x7fff : i *
216 field->logical_minimum / -0x8000;
217 }
218
219 static void pidff_set(struct pidff_usage *usage, u16 value)
220 {
221 usage->value[0] = pidff_rescale(value, 0xffff, usage->field);
222 debug("calculated from %d to %d", value, usage->value[0]);
223 }
224
225 static void pidff_set_signed(struct pidff_usage *usage, s16 value)
226 {
227 if (usage->field->logical_minimum < 0)
228 usage->value[0] = pidff_rescale_signed(value, usage->field);
229 else {
230 if (value < 0)
231 usage->value[0] =
232 pidff_rescale(-value, 0x8000, usage->field);
233 else
234 usage->value[0] =
235 pidff_rescale(value, 0x7fff, usage->field);
236 }
237 debug("calculated from %d to %d", value, usage->value[0]);
238 }
239
240 /*
241 * Send envelope report to the device
242 */
243 static void pidff_set_envelope_report(struct pidff_device *pidff,
244 struct ff_envelope *envelope)
245 {
246 pidff->set_envelope[PID_EFFECT_BLOCK_INDEX].value[0] =
247 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
248
249 pidff->set_envelope[PID_ATTACK_LEVEL].value[0] =
250 pidff_rescale(envelope->attack_level >
251 0x7fff ? 0x7fff : envelope->attack_level, 0x7fff,
252 pidff->set_envelope[PID_ATTACK_LEVEL].field);
253 pidff->set_envelope[PID_FADE_LEVEL].value[0] =
254 pidff_rescale(envelope->fade_level >
255 0x7fff ? 0x7fff : envelope->fade_level, 0x7fff,
256 pidff->set_envelope[PID_FADE_LEVEL].field);
257
258 pidff->set_envelope[PID_ATTACK_TIME].value[0] = envelope->attack_length;
259 pidff->set_envelope[PID_FADE_TIME].value[0] = envelope->fade_length;
260
261 debug("attack %u => %d", envelope->attack_level,
262 pidff->set_envelope[PID_ATTACK_LEVEL].value[0]);
263
264 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_ENVELOPE],
265 USB_DIR_OUT);
266 }
267
268 /*
269 * Test if the new envelope differs from old one
270 */
271 static int pidff_needs_set_envelope(struct ff_envelope *envelope,
272 struct ff_envelope *old)
273 {
274 return envelope->attack_level != old->attack_level ||
275 envelope->fade_level != old->fade_level ||
276 envelope->attack_length != old->attack_length ||
277 envelope->fade_length != old->fade_length;
278 }
279
280 /*
281 * Send constant force report to the device
282 */
283 static void pidff_set_constant_force_report(struct pidff_device *pidff,
284 struct ff_effect *effect)
285 {
286 pidff->set_constant[PID_EFFECT_BLOCK_INDEX].value[0] =
287 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
288 pidff_set_signed(&pidff->set_constant[PID_MAGNITUDE],
289 effect->u.constant.level);
290
291 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_CONSTANT],
292 USB_DIR_OUT);
293 }
294
295 /*
296 * Test if the constant parameters have changed between effects
297 */
298 static int pidff_needs_set_constant(struct ff_effect *effect,
299 struct ff_effect *old)
300 {
301 return effect->u.constant.level != old->u.constant.level;
302 }
303
304 /*
305 * Send set effect report to the device
306 */
307 static void pidff_set_effect_report(struct pidff_device *pidff,
308 struct ff_effect *effect)
309 {
310 pidff->set_effect[PID_EFFECT_BLOCK_INDEX].value[0] =
311 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
312 pidff->set_effect_type->value[0] =
313 pidff->create_new_effect_type->value[0];
314 pidff->set_effect[PID_DURATION].value[0] = effect->replay.length;
315 pidff->set_effect[PID_TRIGGER_BUTTON].value[0] = effect->trigger.button;
316 pidff->set_effect[PID_TRIGGER_REPEAT_INT].value[0] =
317 effect->trigger.interval;
318 pidff->set_effect[PID_GAIN].value[0] =
319 pidff->set_effect[PID_GAIN].field->logical_maximum;
320 pidff->set_effect[PID_DIRECTION_ENABLE].value[0] = 1;
321 pidff->effect_direction->value[0] =
322 pidff_rescale(effect->direction, 0xffff,
323 pidff->effect_direction);
324 pidff->set_effect[PID_START_DELAY].value[0] = effect->replay.delay;
325
326 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_EFFECT],
327 USB_DIR_OUT);
328 }
329
330 /*
331 * Test if the values used in set_effect have changed
332 */
333 static int pidff_needs_set_effect(struct ff_effect *effect,
334 struct ff_effect *old)
335 {
336 return effect->replay.length != old->replay.length ||
337 effect->trigger.interval != old->trigger.interval ||
338 effect->trigger.button != old->trigger.button ||
339 effect->direction != old->direction ||
340 effect->replay.delay != old->replay.delay;
341 }
342
343 /*
344 * Send periodic effect report to the device
345 */
346 static void pidff_set_periodic_report(struct pidff_device *pidff,
347 struct ff_effect *effect)
348 {
349 pidff->set_periodic[PID_EFFECT_BLOCK_INDEX].value[0] =
350 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
351 pidff_set_signed(&pidff->set_periodic[PID_MAGNITUDE],
352 effect->u.periodic.magnitude);
353 pidff_set_signed(&pidff->set_periodic[PID_OFFSET],
354 effect->u.periodic.offset);
355 pidff_set(&pidff->set_periodic[PID_PHASE], effect->u.periodic.phase);
356 pidff->set_periodic[PID_PERIOD].value[0] = effect->u.periodic.period;
357
358 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_PERIODIC],
359 USB_DIR_OUT);
360
361 }
362
363 /*
364 * Test if periodic effect parameters have changed
365 */
366 static int pidff_needs_set_periodic(struct ff_effect *effect,
367 struct ff_effect *old)
368 {
369 return effect->u.periodic.magnitude != old->u.periodic.magnitude ||
370 effect->u.periodic.offset != old->u.periodic.offset ||
371 effect->u.periodic.phase != old->u.periodic.phase ||
372 effect->u.periodic.period != old->u.periodic.period;
373 }
374
375 /*
376 * Send condition effect reports to the device
377 */
378 static void pidff_set_condition_report(struct pidff_device *pidff,
379 struct ff_effect *effect)
380 {
381 int i;
382
383 pidff->set_condition[PID_EFFECT_BLOCK_INDEX].value[0] =
384 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
385
386 for (i = 0; i < 2; i++) {
387 pidff->set_condition[PID_PARAM_BLOCK_OFFSET].value[0] = i;
388 pidff_set_signed(&pidff->set_condition[PID_CP_OFFSET],
389 effect->u.condition[i].center);
390 pidff_set_signed(&pidff->set_condition[PID_POS_COEFFICIENT],
391 effect->u.condition[i].right_coeff);
392 pidff_set_signed(&pidff->set_condition[PID_NEG_COEFFICIENT],
393 effect->u.condition[i].left_coeff);
394 pidff_set(&pidff->set_condition[PID_POS_SATURATION],
395 effect->u.condition[i].right_saturation);
396 pidff_set(&pidff->set_condition[PID_NEG_SATURATION],
397 effect->u.condition[i].left_saturation);
398 pidff_set(&pidff->set_condition[PID_DEAD_BAND],
399 effect->u.condition[i].deadband);
400 usbhid_wait_io(pidff->hid);
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_wait_io(pidff->hid);
516 usbhid_submit_report(pidff->hid, pidff->reports[PID_EFFECT_OPERATION],
517 USB_DIR_OUT);
518 }
519
520 /**
521 * Play the effect with effect id @effect_id for @value times
522 */
523 static int pidff_playback(struct input_dev *dev, int effect_id, int value)
524 {
525 struct pidff_device *pidff = dev->ff->private;
526
527 pidff_playback_pid(pidff, pidff->pid_id[effect_id], value);
528
529 return 0;
530 }
531
532 /*
533 * Erase effect with PID id
534 */
535 static void pidff_erase_pid(struct pidff_device *pidff, int pid_id)
536 {
537 pidff->block_free[PID_EFFECT_BLOCK_INDEX].value[0] = pid_id;
538 usbhid_submit_report(pidff->hid, pidff->reports[PID_BLOCK_FREE],
539 USB_DIR_OUT);
540 }
541
542 /*
543 * Stop and erase effect with effect_id
544 */
545 static int pidff_erase_effect(struct input_dev *dev, int effect_id)
546 {
547 struct pidff_device *pidff = dev->ff->private;
548 int pid_id = pidff->pid_id[effect_id];
549
550 debug("starting to erase %d/%d", effect_id, pidff->pid_id[effect_id]);
551 pidff_playback_pid(pidff, pid_id, 0);
552 pidff_erase_pid(pidff, pid_id);
553
554 return 0;
555 }
556
557 /*
558 * Effect upload handler
559 */
560 static int pidff_upload_effect(struct input_dev *dev, struct ff_effect *effect,
561 struct ff_effect *old)
562 {
563 struct pidff_device *pidff = dev->ff->private;
564 int type_id;
565 int error;
566
567 switch (effect->type) {
568 case FF_CONSTANT:
569 if (!old) {
570 error = pidff_request_effect_upload(pidff,
571 pidff->type_id[PID_CONSTANT]);
572 if (error)
573 return error;
574 }
575 if (!old || pidff_needs_set_effect(effect, old))
576 pidff_set_effect_report(pidff, effect);
577 if (!old || pidff_needs_set_constant(effect, old))
578 pidff_set_constant_force_report(pidff, effect);
579 if (!old ||
580 pidff_needs_set_envelope(&effect->u.constant.envelope,
581 &old->u.constant.envelope))
582 pidff_set_envelope_report(pidff,
583 &effect->u.constant.envelope);
584 break;
585
586 case FF_PERIODIC:
587 if (!old) {
588 switch (effect->u.periodic.waveform) {
589 case FF_SQUARE:
590 type_id = PID_SQUARE;
591 break;
592 case FF_TRIANGLE:
593 type_id = PID_TRIANGLE;
594 break;
595 case FF_SINE:
596 type_id = PID_SINE;
597 break;
598 case FF_SAW_UP:
599 type_id = PID_SAW_UP;
600 break;
601 case FF_SAW_DOWN:
602 type_id = PID_SAW_DOWN;
603 break;
604 default:
605 printk(KERN_ERR
606 "hid-pidff: invalid waveform\n");
607 return -EINVAL;
608 }
609
610 error = pidff_request_effect_upload(pidff,
611 pidff->type_id[type_id]);
612 if (error)
613 return error;
614 }
615 if (!old || pidff_needs_set_effect(effect, old))
616 pidff_set_effect_report(pidff, effect);
617 if (!old || pidff_needs_set_periodic(effect, old))
618 pidff_set_periodic_report(pidff, effect);
619 if (!old ||
620 pidff_needs_set_envelope(&effect->u.periodic.envelope,
621 &old->u.periodic.envelope))
622 pidff_set_envelope_report(pidff,
623 &effect->u.periodic.envelope);
624 break;
625
626 case FF_RAMP:
627 if (!old) {
628 error = pidff_request_effect_upload(pidff,
629 pidff->type_id[PID_RAMP]);
630 if (error)
631 return error;
632 }
633 if (!old || pidff_needs_set_effect(effect, old))
634 pidff_set_effect_report(pidff, effect);
635 if (!old || pidff_needs_set_ramp(effect, old))
636 pidff_set_ramp_force_report(pidff, effect);
637 if (!old ||
638 pidff_needs_set_envelope(&effect->u.ramp.envelope,
639 &old->u.ramp.envelope))
640 pidff_set_envelope_report(pidff,
641 &effect->u.ramp.envelope);
642 break;
643
644 case FF_SPRING:
645 if (!old) {
646 error = pidff_request_effect_upload(pidff,
647 pidff->type_id[PID_SPRING]);
648 if (error)
649 return error;
650 }
651 if (!old || pidff_needs_set_effect(effect, old))
652 pidff_set_effect_report(pidff, effect);
653 if (!old || pidff_needs_set_condition(effect, old))
654 pidff_set_condition_report(pidff, effect);
655 break;
656
657 case FF_FRICTION:
658 if (!old) {
659 error = pidff_request_effect_upload(pidff,
660 pidff->type_id[PID_FRICTION]);
661 if (error)
662 return error;
663 }
664 if (!old || pidff_needs_set_effect(effect, old))
665 pidff_set_effect_report(pidff, effect);
666 if (!old || pidff_needs_set_condition(effect, old))
667 pidff_set_condition_report(pidff, effect);
668 break;
669
670 case FF_DAMPER:
671 if (!old) {
672 error = pidff_request_effect_upload(pidff,
673 pidff->type_id[PID_DAMPER]);
674 if (error)
675 return error;
676 }
677 if (!old || pidff_needs_set_effect(effect, old))
678 pidff_set_effect_report(pidff, effect);
679 if (!old || pidff_needs_set_condition(effect, old))
680 pidff_set_condition_report(pidff, effect);
681 break;
682
683 case FF_INERTIA:
684 if (!old) {
685 error = pidff_request_effect_upload(pidff,
686 pidff->type_id[PID_INERTIA]);
687 if (error)
688 return error;
689 }
690 if (!old || pidff_needs_set_effect(effect, old))
691 pidff_set_effect_report(pidff, effect);
692 if (!old || pidff_needs_set_condition(effect, old))
693 pidff_set_condition_report(pidff, effect);
694 break;
695
696 default:
697 printk(KERN_ERR "hid-pidff: invalid type\n");
698 return -EINVAL;
699 }
700
701 if (!old)
702 pidff->pid_id[effect->id] =
703 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
704
705 debug("uploaded");
706
707 return 0;
708 }
709
710 /*
711 * set_gain() handler
712 */
713 static void pidff_set_gain(struct input_dev *dev, u16 gain)
714 {
715 struct pidff_device *pidff = dev->ff->private;
716
717 pidff_set(&pidff->device_gain[PID_DEVICE_GAIN_FIELD], gain);
718 usbhid_submit_report(pidff->hid, pidff->reports[PID_DEVICE_GAIN],
719 USB_DIR_OUT);
720 }
721
722 static void pidff_autocenter(struct pidff_device *pidff, u16 magnitude)
723 {
724 struct hid_field *field =
725 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field;
726
727 if (!magnitude) {
728 pidff_playback_pid(pidff, field->logical_minimum, 0);
729 return;
730 }
731
732 pidff_playback_pid(pidff, field->logical_minimum, 1);
733
734 pidff->set_effect[PID_EFFECT_BLOCK_INDEX].value[0] =
735 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum;
736 pidff->set_effect_type->value[0] = pidff->type_id[PID_SPRING];
737 pidff->set_effect[PID_DURATION].value[0] = 0;
738 pidff->set_effect[PID_TRIGGER_BUTTON].value[0] = 0;
739 pidff->set_effect[PID_TRIGGER_REPEAT_INT].value[0] = 0;
740 pidff_set(&pidff->set_effect[PID_GAIN], magnitude);
741 pidff->set_effect[PID_START_DELAY].value[0] = 0;
742
743 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_EFFECT],
744 USB_DIR_OUT);
745 }
746
747 /*
748 * pidff_set_autocenter() handler
749 */
750 static void pidff_set_autocenter(struct input_dev *dev, u16 magnitude)
751 {
752 struct pidff_device *pidff = dev->ff->private;
753
754 pidff_autocenter(pidff, magnitude);
755 }
756
757 /*
758 * Find fields from a report and fill a pidff_usage
759 */
760 static int pidff_find_fields(struct pidff_usage *usage, const u8 *table,
761 struct hid_report *report, int count, int strict)
762 {
763 int i, j, k, found;
764
765 for (k = 0; k < count; k++) {
766 found = 0;
767 for (i = 0; i < report->maxfield; i++) {
768 if (report->field[i]->maxusage !=
769 report->field[i]->report_count) {
770 debug("maxusage and report_count do not match, "
771 "skipping");
772 continue;
773 }
774 for (j = 0; j < report->field[i]->maxusage; j++) {
775 if (report->field[i]->usage[j].hid ==
776 (HID_UP_PID | table[k])) {
777 debug("found %d at %d->%d", k, i, j);
778 usage[k].field = report->field[i];
779 usage[k].value =
780 &report->field[i]->value[j];
781 found = 1;
782 break;
783 }
784 }
785 if (found)
786 break;
787 }
788 if (!found && strict) {
789 debug("failed to locate %d", k);
790 return -1;
791 }
792 }
793 return 0;
794 }
795
796 /*
797 * Return index into pidff_reports for the given usage
798 */
799 static int pidff_check_usage(int usage)
800 {
801 int i;
802
803 for (i = 0; i < sizeof(pidff_reports); i++)
804 if (usage == (HID_UP_PID | pidff_reports[i]))
805 return i;
806
807 return -1;
808 }
809
810 /*
811 * Find the reports and fill pidff->reports[]
812 * report_type specifies either OUTPUT or FEATURE reports
813 */
814 static void pidff_find_reports(struct hid_device *hid, int report_type,
815 struct pidff_device *pidff)
816 {
817 struct hid_report *report;
818 int i, ret;
819
820 list_for_each_entry(report,
821 &hid->report_enum[report_type].report_list, list) {
822 if (report->maxfield < 1)
823 continue;
824 ret = pidff_check_usage(report->field[0]->logical);
825 if (ret != -1) {
826 debug("found usage 0x%02x from field->logical",
827 pidff_reports[ret]);
828 pidff->reports[ret] = report;
829 continue;
830 }
831
832 /*
833 * Sometimes logical collections are stacked to indicate
834 * different usages for the report and the field, in which
835 * case we want the usage of the parent. However, Linux HID
836 * implementation hides this fact, so we have to dig it up
837 * ourselves
838 */
839 i = report->field[0]->usage[0].collection_index;
840 if (i <= 0 ||
841 hid->collection[i - 1].type != HID_COLLECTION_LOGICAL)
842 continue;
843 ret = pidff_check_usage(hid->collection[i - 1].usage);
844 if (ret != -1 && !pidff->reports[ret]) {
845 debug("found usage 0x%02x from collection array",
846 pidff_reports[ret]);
847 pidff->reports[ret] = report;
848 }
849 }
850 }
851
852 /*
853 * Test if the required reports have been found
854 */
855 static int pidff_reports_ok(struct pidff_device *pidff)
856 {
857 int i;
858
859 for (i = 0; i <= PID_REQUIRED_REPORTS; i++) {
860 if (!pidff->reports[i]) {
861 debug("%d missing", i);
862 return 0;
863 }
864 }
865
866 return 1;
867 }
868
869 /*
870 * Find a field with a specific usage within a report
871 */
872 static struct hid_field *pidff_find_special_field(struct hid_report *report,
873 int usage, int enforce_min)
874 {
875 int i;
876
877 for (i = 0; i < report->maxfield; i++) {
878 if (report->field[i]->logical == (HID_UP_PID | usage) &&
879 report->field[i]->report_count > 0) {
880 if (!enforce_min ||
881 report->field[i]->logical_minimum == 1)
882 return report->field[i];
883 else {
884 printk(KERN_ERR "hid-pidff: logical_minimum "
885 "is not 1 as it should be\n");
886 return NULL;
887 }
888 }
889 }
890 return NULL;
891 }
892
893 /*
894 * Fill a pidff->*_id struct table
895 */
896 static int pidff_find_special_keys(int *keys, struct hid_field *fld,
897 const u8 *usagetable, int count)
898 {
899
900 int i, j;
901 int found = 0;
902
903 for (i = 0; i < count; i++) {
904 for (j = 0; j < fld->maxusage; j++) {
905 if (fld->usage[j].hid == (HID_UP_PID | usagetable[i])) {
906 keys[i] = j + 1;
907 found++;
908 break;
909 }
910 }
911 }
912 return found;
913 }
914
915 #define PIDFF_FIND_SPECIAL_KEYS(keys, field, name) \
916 pidff_find_special_keys(pidff->keys, pidff->field, pidff_ ## name, \
917 sizeof(pidff_ ## name))
918
919 /*
920 * Find and check the special fields
921 */
922 static int pidff_find_special_fields(struct pidff_device *pidff)
923 {
924 debug("finding special fields");
925
926 pidff->create_new_effect_type =
927 pidff_find_special_field(pidff->reports[PID_CREATE_NEW_EFFECT],
928 0x25, 1);
929 pidff->set_effect_type =
930 pidff_find_special_field(pidff->reports[PID_SET_EFFECT],
931 0x25, 1);
932 pidff->effect_direction =
933 pidff_find_special_field(pidff->reports[PID_SET_EFFECT],
934 0x57, 0);
935 pidff->device_control =
936 pidff_find_special_field(pidff->reports[PID_DEVICE_CONTROL],
937 0x96, 1);
938 pidff->block_load_status =
939 pidff_find_special_field(pidff->reports[PID_BLOCK_LOAD],
940 0x8b, 1);
941 pidff->effect_operation_status =
942 pidff_find_special_field(pidff->reports[PID_EFFECT_OPERATION],
943 0x78, 1);
944
945 debug("search done");
946
947 if (!pidff->create_new_effect_type || !pidff->set_effect_type) {
948 printk(KERN_ERR "hid-pidff: effect lists not found\n");
949 return -1;
950 }
951
952 if (!pidff->effect_direction) {
953 printk(KERN_ERR "hid-pidff: direction field not found\n");
954 return -1;
955 }
956
957 if (!pidff->device_control) {
958 printk(KERN_ERR "hid-pidff: device control field not found\n");
959 return -1;
960 }
961
962 if (!pidff->block_load_status) {
963 printk(KERN_ERR
964 "hid-pidff: block load status field not found\n");
965 return -1;
966 }
967
968 if (!pidff->effect_operation_status) {
969 printk(KERN_ERR
970 "hid-pidff: effect operation field not found\n");
971 return -1;
972 }
973
974 pidff_find_special_keys(pidff->control_id, pidff->device_control,
975 pidff_device_control,
976 sizeof(pidff_device_control));
977
978 PIDFF_FIND_SPECIAL_KEYS(control_id, device_control, device_control);
979
980 if (!PIDFF_FIND_SPECIAL_KEYS(type_id, create_new_effect_type,
981 effect_types)) {
982 printk(KERN_ERR "hid-pidff: no effect types found\n");
983 return -1;
984 }
985
986 if (PIDFF_FIND_SPECIAL_KEYS(status_id, block_load_status,
987 block_load_status) !=
988 sizeof(pidff_block_load_status)) {
989 printk(KERN_ERR
990 "hidpidff: block load status identifiers not found\n");
991 return -1;
992 }
993
994 if (PIDFF_FIND_SPECIAL_KEYS(operation_id, effect_operation_status,
995 effect_operation_status) !=
996 sizeof(pidff_effect_operation_status)) {
997 printk(KERN_ERR
998 "hidpidff: effect operation identifiers not found\n");
999 return -1;
1000 }
1001
1002 return 0;
1003 }
1004
1005 /**
1006 * Find the implemented effect types
1007 */
1008 static int pidff_find_effects(struct pidff_device *pidff,
1009 struct input_dev *dev)
1010 {
1011 int i;
1012
1013 for (i = 0; i < sizeof(pidff_effect_types); i++) {
1014 int pidff_type = pidff->type_id[i];
1015 if (pidff->set_effect_type->usage[pidff_type].hid !=
1016 pidff->create_new_effect_type->usage[pidff_type].hid) {
1017 printk(KERN_ERR "hid-pidff: "
1018 "effect type number %d is invalid\n", i);
1019 return -1;
1020 }
1021 }
1022
1023 if (pidff->type_id[PID_CONSTANT])
1024 set_bit(FF_CONSTANT, dev->ffbit);
1025 if (pidff->type_id[PID_RAMP])
1026 set_bit(FF_RAMP, dev->ffbit);
1027 if (pidff->type_id[PID_SQUARE]) {
1028 set_bit(FF_SQUARE, dev->ffbit);
1029 set_bit(FF_PERIODIC, dev->ffbit);
1030 }
1031 if (pidff->type_id[PID_SINE]) {
1032 set_bit(FF_SINE, dev->ffbit);
1033 set_bit(FF_PERIODIC, dev->ffbit);
1034 }
1035 if (pidff->type_id[PID_TRIANGLE]) {
1036 set_bit(FF_TRIANGLE, dev->ffbit);
1037 set_bit(FF_PERIODIC, dev->ffbit);
1038 }
1039 if (pidff->type_id[PID_SAW_UP]) {
1040 set_bit(FF_SAW_UP, dev->ffbit);
1041 set_bit(FF_PERIODIC, dev->ffbit);
1042 }
1043 if (pidff->type_id[PID_SAW_DOWN]) {
1044 set_bit(FF_SAW_DOWN, dev->ffbit);
1045 set_bit(FF_PERIODIC, dev->ffbit);
1046 }
1047 if (pidff->type_id[PID_SPRING])
1048 set_bit(FF_SPRING, dev->ffbit);
1049 if (pidff->type_id[PID_DAMPER])
1050 set_bit(FF_DAMPER, dev->ffbit);
1051 if (pidff->type_id[PID_INERTIA])
1052 set_bit(FF_INERTIA, dev->ffbit);
1053 if (pidff->type_id[PID_FRICTION])
1054 set_bit(FF_FRICTION, dev->ffbit);
1055
1056 return 0;
1057
1058 }
1059
1060 #define PIDFF_FIND_FIELDS(name, report, strict) \
1061 pidff_find_fields(pidff->name, pidff_ ## name, \
1062 pidff->reports[report], \
1063 sizeof(pidff_ ## name), strict)
1064
1065 /*
1066 * Fill and check the pidff_usages
1067 */
1068 static int pidff_init_fields(struct pidff_device *pidff, struct input_dev *dev)
1069 {
1070 int envelope_ok = 0;
1071
1072 if (PIDFF_FIND_FIELDS(set_effect, PID_SET_EFFECT, 1)) {
1073 printk(KERN_ERR
1074 "hid-pidff: unknown set_effect report layout\n");
1075 return -ENODEV;
1076 }
1077
1078 PIDFF_FIND_FIELDS(block_load, PID_BLOCK_LOAD, 0);
1079 if (!pidff->block_load[PID_EFFECT_BLOCK_INDEX].value) {
1080 printk(KERN_ERR
1081 "hid-pidff: unknown pid_block_load report layout\n");
1082 return -ENODEV;
1083 }
1084
1085 if (PIDFF_FIND_FIELDS(effect_operation, PID_EFFECT_OPERATION, 1)) {
1086 printk(KERN_ERR
1087 "hid-pidff: unknown effect_operation report layout\n");
1088 return -ENODEV;
1089 }
1090
1091 if (PIDFF_FIND_FIELDS(block_free, PID_BLOCK_FREE, 1)) {
1092 printk(KERN_ERR
1093 "hid-pidff: unknown pid_block_free report layout\n");
1094 return -ENODEV;
1095 }
1096
1097 if (!PIDFF_FIND_FIELDS(set_envelope, PID_SET_ENVELOPE, 1))
1098 envelope_ok = 1;
1099
1100 if (pidff_find_special_fields(pidff) || pidff_find_effects(pidff, dev))
1101 return -ENODEV;
1102
1103 if (!envelope_ok) {
1104 if (test_and_clear_bit(FF_CONSTANT, dev->ffbit))
1105 printk(KERN_WARNING "hid-pidff: "
1106 "has constant effect but no envelope\n");
1107 if (test_and_clear_bit(FF_RAMP, dev->ffbit))
1108 printk(KERN_WARNING "hid-pidff: "
1109 "has ramp effect but no envelope\n");
1110
1111 if (test_and_clear_bit(FF_PERIODIC, dev->ffbit))
1112 printk(KERN_WARNING "hid-pidff: "
1113 "has periodic effect but no envelope\n");
1114 }
1115
1116 if (test_bit(FF_CONSTANT, dev->ffbit) &&
1117 PIDFF_FIND_FIELDS(set_constant, PID_SET_CONSTANT, 1)) {
1118 printk(KERN_WARNING
1119 "hid-pidff: unknown constant effect layout\n");
1120 clear_bit(FF_CONSTANT, dev->ffbit);
1121 }
1122
1123 if (test_bit(FF_RAMP, dev->ffbit) &&
1124 PIDFF_FIND_FIELDS(set_ramp, PID_SET_RAMP, 1)) {
1125 printk(KERN_WARNING "hid-pidff: unknown ramp effect layout\n");
1126 clear_bit(FF_RAMP, dev->ffbit);
1127 }
1128
1129 if ((test_bit(FF_SPRING, dev->ffbit) ||
1130 test_bit(FF_DAMPER, dev->ffbit) ||
1131 test_bit(FF_FRICTION, dev->ffbit) ||
1132 test_bit(FF_INERTIA, dev->ffbit)) &&
1133 PIDFF_FIND_FIELDS(set_condition, PID_SET_CONDITION, 1)) {
1134 printk(KERN_WARNING
1135 "hid-pidff: unknown condition effect layout\n");
1136 clear_bit(FF_SPRING, dev->ffbit);
1137 clear_bit(FF_DAMPER, dev->ffbit);
1138 clear_bit(FF_FRICTION, dev->ffbit);
1139 clear_bit(FF_INERTIA, dev->ffbit);
1140 }
1141
1142 if (test_bit(FF_PERIODIC, dev->ffbit) &&
1143 PIDFF_FIND_FIELDS(set_periodic, PID_SET_PERIODIC, 1)) {
1144 printk(KERN_WARNING
1145 "hid-pidff: unknown periodic effect layout\n");
1146 clear_bit(FF_PERIODIC, dev->ffbit);
1147 }
1148
1149 PIDFF_FIND_FIELDS(pool, PID_POOL, 0);
1150
1151 if (!PIDFF_FIND_FIELDS(device_gain, PID_DEVICE_GAIN, 1))
1152 set_bit(FF_GAIN, dev->ffbit);
1153
1154 return 0;
1155 }
1156
1157 /*
1158 * Reset the device
1159 */
1160 static void pidff_reset(struct pidff_device *pidff)
1161 {
1162 struct hid_device *hid = pidff->hid;
1163 int i = 0;
1164
1165 pidff->device_control->value[0] = pidff->control_id[PID_RESET];
1166 /* We reset twice as sometimes hid_wait_io isn't waiting long enough */
1167 usbhid_submit_report(hid, pidff->reports[PID_DEVICE_CONTROL], USB_DIR_OUT);
1168 usbhid_wait_io(hid);
1169 usbhid_submit_report(hid, pidff->reports[PID_DEVICE_CONTROL], USB_DIR_OUT);
1170 usbhid_wait_io(hid);
1171
1172 pidff->device_control->value[0] =
1173 pidff->control_id[PID_ENABLE_ACTUATORS];
1174 usbhid_submit_report(hid, pidff->reports[PID_DEVICE_CONTROL], USB_DIR_OUT);
1175 usbhid_wait_io(hid);
1176
1177 /* pool report is sometimes messed up, refetch it */
1178 usbhid_submit_report(hid, pidff->reports[PID_POOL], USB_DIR_IN);
1179 usbhid_wait_io(hid);
1180
1181 if (pidff->pool[PID_SIMULTANEOUS_MAX].value) {
1182 int sim_effects = pidff->pool[PID_SIMULTANEOUS_MAX].value[0];
1183 while (sim_effects < 2) {
1184 if (i++ > 20) {
1185 printk(KERN_WARNING "hid-pidff: device reports "
1186 "%d simultaneous effects\n",
1187 sim_effects);
1188 break;
1189 }
1190 debug("pid_pool requested again");
1191 usbhid_submit_report(hid, pidff->reports[PID_POOL],
1192 USB_DIR_IN);
1193 usbhid_wait_io(hid);
1194 }
1195 }
1196 }
1197
1198 /*
1199 * Test if autocenter modification is using the supported method
1200 */
1201 static int pidff_check_autocenter(struct pidff_device *pidff,
1202 struct input_dev *dev)
1203 {
1204 int error;
1205
1206 /*
1207 * Let's find out if autocenter modification is supported
1208 * Specification doesn't specify anything, so we request an
1209 * effect upload and cancel it immediately. If the approved
1210 * effect id was one above the minimum, then we assume the first
1211 * effect id is a built-in spring type effect used for autocenter
1212 */
1213
1214 error = pidff_request_effect_upload(pidff, 1);
1215 if (error) {
1216 printk(KERN_ERR "hid-pidff: upload request failed\n");
1217 return error;
1218 }
1219
1220 if (pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] ==
1221 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum + 1) {
1222 pidff_autocenter(pidff, 0xffff);
1223 set_bit(FF_AUTOCENTER, dev->ffbit);
1224 } else {
1225 printk(KERN_NOTICE "hid-pidff: "
1226 "device has unknown autocenter control method\n");
1227 }
1228
1229 pidff_erase_pid(pidff,
1230 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0]);
1231
1232 return 0;
1233
1234 }
1235
1236 /*
1237 * Check if the device is PID and initialize it
1238 */
1239 int hid_pidff_init(struct hid_device *hid)
1240 {
1241 struct pidff_device *pidff;
1242 struct hid_input *hidinput = list_entry(hid->inputs.next,
1243 struct hid_input, list);
1244 struct input_dev *dev = hidinput->input;
1245 struct ff_device *ff;
1246 int max_effects;
1247 int error;
1248
1249 debug("starting pid init");
1250
1251 if (list_empty(&hid->report_enum[HID_OUTPUT_REPORT].report_list)) {
1252 debug("not a PID device, no output report");
1253 return -ENODEV;
1254 }
1255
1256 pidff = kzalloc(sizeof(*pidff), GFP_KERNEL);
1257 if (!pidff)
1258 return -ENOMEM;
1259
1260 pidff->hid = hid;
1261
1262 pidff_find_reports(hid, HID_OUTPUT_REPORT, pidff);
1263 pidff_find_reports(hid, HID_FEATURE_REPORT, pidff);
1264
1265 if (!pidff_reports_ok(pidff)) {
1266 debug("reports not ok, aborting");
1267 error = -ENODEV;
1268 goto fail;
1269 }
1270
1271 error = pidff_init_fields(pidff, dev);
1272 if (error)
1273 goto fail;
1274
1275 pidff_reset(pidff);
1276
1277 if (test_bit(FF_GAIN, dev->ffbit)) {
1278 pidff_set(&pidff->device_gain[PID_DEVICE_GAIN_FIELD], 0xffff);
1279 usbhid_submit_report(pidff->hid, pidff->reports[PID_DEVICE_GAIN],
1280 USB_DIR_OUT);
1281 }
1282
1283 error = pidff_check_autocenter(pidff, dev);
1284 if (error)
1285 goto fail;
1286
1287 max_effects =
1288 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_maximum -
1289 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum +
1290 1;
1291 debug("max effects is %d", max_effects);
1292
1293 if (max_effects > PID_EFFECTS_MAX)
1294 max_effects = PID_EFFECTS_MAX;
1295
1296 if (pidff->pool[PID_SIMULTANEOUS_MAX].value)
1297 debug("max simultaneous effects is %d",
1298 pidff->pool[PID_SIMULTANEOUS_MAX].value[0]);
1299
1300 if (pidff->pool[PID_RAM_POOL_SIZE].value)
1301 debug("device memory size is %d bytes",
1302 pidff->pool[PID_RAM_POOL_SIZE].value[0]);
1303
1304 if (pidff->pool[PID_DEVICE_MANAGED_POOL].value &&
1305 pidff->pool[PID_DEVICE_MANAGED_POOL].value[0] == 0) {
1306 printk(KERN_NOTICE "hid-pidff: "
1307 "device does not support device managed pool\n");
1308 goto fail;
1309 }
1310
1311 error = input_ff_create(dev, max_effects);
1312 if (error)
1313 goto fail;
1314
1315 ff = dev->ff;
1316 ff->private = pidff;
1317 ff->upload = pidff_upload_effect;
1318 ff->erase = pidff_erase_effect;
1319 ff->set_gain = pidff_set_gain;
1320 ff->set_autocenter = pidff_set_autocenter;
1321 ff->playback = pidff_playback;
1322
1323 printk(KERN_INFO "Force feedback for USB HID PID devices by "
1324 "Anssi Hannula <anssi.hannula@gmail.com>\n");
1325
1326 return 0;
1327
1328 fail:
1329 kfree(pidff);
1330 return error;
1331 }
linux v2.6.22.y-op