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 55static 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 61the 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 73static 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 81static 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 90static 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 98static const u8 pidff_set_periodic[] = { 0x22, 0x70, 0x6f, 0x71, 0x72 }; 99static const u8 pidff_set_constant[] = { 0x22, 0x70 }; 100 101#define PID_RAMP_START 1 102#define PID_RAMP_END 2 103static const u8 pidff_set_ramp[] = { 0x22, 0x75, 0x76 }; 104 105#define PID_RAM_POOL_AVAILABLE 1 106static const u8 pidff_block_load[] = { 0x22, 0xac }; 107 108#define PID_LOOP_COUNT 1 109static const u8 pidff_effect_operation[] = { 0x22, 0x7c }; 110 111static const u8 pidff_block_free[] = { 0x22 }; 112 113#define PID_DEVICE_GAIN_FIELD 0 114static 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 119static 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 125static 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 138static 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 145static const u8 pidff_block_load_status[] = { 0x8c, 0x8d }; 146 147#define PID_EFFECT_START 0 148#define PID_EFFECT_STOP 1 149static const u8 pidff_effect_operation_status[] = { 0x79, 0x7b }; 150 151struct pidff_usage { 152 struct hid_field *field; 153 s32 *value; 154}; 155 156struct 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 */ 204static 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 */ 213static 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 220static 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 226static 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 */ 244static 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 */ 272static 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 */ 284static 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 */ 299static 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 */ 308static 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 */ 334static 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 */ 347static 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 */ 367static 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 */ 379static 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 */ 409static 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 */ 433static 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 */ 449static 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 */ 462static 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 */ 502static 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 */ 522static 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 */ 534static 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 */ 544static 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 */ 562static 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 */ 715static 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 724static 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 */ 753static 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 */ 763static 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 */ 802static 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 */ 817static 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 */ 858static 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 */ 875static 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 */ 899static 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 */ 925static 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 */ 1011static 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 */ 1071static 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 */ 1163static 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 */ 1203static 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 */ 1241int 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} 1334