1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Force feedback driver for USB HID PID compliant devices 4 * 5 * Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com> 6 */ 7 8/* 9 */ 10 11/* #define DEBUG */ 12 13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14 15#include <linux/input.h> 16#include <linux/slab.h> 17#include <linux/usb.h> 18 19#include <linux/hid.h> 20 21#include "usbhid.h" 22 23#define PID_EFFECTS_MAX 64 24 25/* Report usage table used to put reports into an array */ 26 27#define PID_SET_EFFECT 0 28#define PID_EFFECT_OPERATION 1 29#define PID_DEVICE_GAIN 2 30#define PID_POOL 3 31#define PID_BLOCK_LOAD 4 32#define PID_BLOCK_FREE 5 33#define PID_DEVICE_CONTROL 6 34#define PID_CREATE_NEW_EFFECT 7 35 36#define PID_REQUIRED_REPORTS 7 37 38#define PID_SET_ENVELOPE 8 39#define PID_SET_CONDITION 9 40#define PID_SET_PERIODIC 10 41#define PID_SET_CONSTANT 11 42#define PID_SET_RAMP 12 43static const u8 pidff_reports[] = { 44 0x21, 0x77, 0x7d, 0x7f, 0x89, 0x90, 0x96, 0xab, 45 0x5a, 0x5f, 0x6e, 0x73, 0x74 46}; 47 48/* device_control is really 0x95, but 0x96 specified as it is the usage of 49the only field in that report */ 50 51/* Value usage tables used to put fields and values into arrays */ 52 53#define PID_EFFECT_BLOCK_INDEX 0 54 55#define PID_DURATION 1 56#define PID_GAIN 2 57#define PID_TRIGGER_BUTTON 3 58#define PID_TRIGGER_REPEAT_INT 4 59#define PID_DIRECTION_ENABLE 5 60#define PID_START_DELAY 6 61static const u8 pidff_set_effect[] = { 62 0x22, 0x50, 0x52, 0x53, 0x54, 0x56, 0xa7 63}; 64 65#define PID_ATTACK_LEVEL 1 66#define PID_ATTACK_TIME 2 67#define PID_FADE_LEVEL 3 68#define PID_FADE_TIME 4 69static const u8 pidff_set_envelope[] = { 0x22, 0x5b, 0x5c, 0x5d, 0x5e }; 70 71#define PID_PARAM_BLOCK_OFFSET 1 72#define PID_CP_OFFSET 2 73#define PID_POS_COEFFICIENT 3 74#define PID_NEG_COEFFICIENT 4 75#define PID_POS_SATURATION 5 76#define PID_NEG_SATURATION 6 77#define PID_DEAD_BAND 7 78static const u8 pidff_set_condition[] = { 79 0x22, 0x23, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65 80}; 81 82#define PID_MAGNITUDE 1 83#define PID_OFFSET 2 84#define PID_PHASE 3 85#define PID_PERIOD 4 86static const u8 pidff_set_periodic[] = { 0x22, 0x70, 0x6f, 0x71, 0x72 }; 87static const u8 pidff_set_constant[] = { 0x22, 0x70 }; 88 89#define PID_RAMP_START 1 90#define PID_RAMP_END 2 91static const u8 pidff_set_ramp[] = { 0x22, 0x75, 0x76 }; 92 93#define PID_RAM_POOL_AVAILABLE 1 94static const u8 pidff_block_load[] = { 0x22, 0xac }; 95 96#define PID_LOOP_COUNT 1 97static const u8 pidff_effect_operation[] = { 0x22, 0x7c }; 98 99static const u8 pidff_block_free[] = { 0x22 }; 100 101#define PID_DEVICE_GAIN_FIELD 0 102static const u8 pidff_device_gain[] = { 0x7e }; 103 104#define PID_RAM_POOL_SIZE 0 105#define PID_SIMULTANEOUS_MAX 1 106#define PID_DEVICE_MANAGED_POOL 2 107static const u8 pidff_pool[] = { 0x80, 0x83, 0xa9 }; 108 109/* Special field key tables used to put special field keys into arrays */ 110 111#define PID_ENABLE_ACTUATORS 0 112#define PID_RESET 1 113static const u8 pidff_device_control[] = { 0x97, 0x9a }; 114 115#define PID_CONSTANT 0 116#define PID_RAMP 1 117#define PID_SQUARE 2 118#define PID_SINE 3 119#define PID_TRIANGLE 4 120#define PID_SAW_UP 5 121#define PID_SAW_DOWN 6 122#define PID_SPRING 7 123#define PID_DAMPER 8 124#define PID_INERTIA 9 125#define PID_FRICTION 10 126static const u8 pidff_effect_types[] = { 127 0x26, 0x27, 0x30, 0x31, 0x32, 0x33, 0x34, 128 0x40, 0x41, 0x42, 0x43 129}; 130 131#define PID_BLOCK_LOAD_SUCCESS 0 132#define PID_BLOCK_LOAD_FULL 1 133static const u8 pidff_block_load_status[] = { 0x8c, 0x8d }; 134 135#define PID_EFFECT_START 0 136#define PID_EFFECT_STOP 1 137static const u8 pidff_effect_operation_status[] = { 0x79, 0x7b }; 138 139struct pidff_usage { 140 struct hid_field *field; 141 s32 *value; 142}; 143 144struct pidff_device { 145 struct hid_device *hid; 146 147 struct hid_report *reports[sizeof(pidff_reports)]; 148 149 struct pidff_usage set_effect[sizeof(pidff_set_effect)]; 150 struct pidff_usage set_envelope[sizeof(pidff_set_envelope)]; 151 struct pidff_usage set_condition[sizeof(pidff_set_condition)]; 152 struct pidff_usage set_periodic[sizeof(pidff_set_periodic)]; 153 struct pidff_usage set_constant[sizeof(pidff_set_constant)]; 154 struct pidff_usage set_ramp[sizeof(pidff_set_ramp)]; 155 156 struct pidff_usage device_gain[sizeof(pidff_device_gain)]; 157 struct pidff_usage block_load[sizeof(pidff_block_load)]; 158 struct pidff_usage pool[sizeof(pidff_pool)]; 159 struct pidff_usage effect_operation[sizeof(pidff_effect_operation)]; 160 struct pidff_usage block_free[sizeof(pidff_block_free)]; 161 162 /* Special field is a field that is not composed of 163 usage<->value pairs that pidff_usage values are */ 164 165 /* Special field in create_new_effect */ 166 struct hid_field *create_new_effect_type; 167 168 /* Special fields in set_effect */ 169 struct hid_field *set_effect_type; 170 struct hid_field *effect_direction; 171 172 /* Special field in device_control */ 173 struct hid_field *device_control; 174 175 /* Special field in block_load */ 176 struct hid_field *block_load_status; 177 178 /* Special field in effect_operation */ 179 struct hid_field *effect_operation_status; 180 181 int control_id[sizeof(pidff_device_control)]; 182 int type_id[sizeof(pidff_effect_types)]; 183 int status_id[sizeof(pidff_block_load_status)]; 184 int operation_id[sizeof(pidff_effect_operation_status)]; 185 186 int pid_id[PID_EFFECTS_MAX]; 187}; 188 189/* 190 * Scale an unsigned value with range 0..max for the given field 191 */ 192static int pidff_rescale(int i, int max, struct hid_field *field) 193{ 194 return i * (field->logical_maximum - field->logical_minimum) / max + 195 field->logical_minimum; 196} 197 198/* 199 * Scale a signed value in range -0x8000..0x7fff for the given field 200 */ 201static int pidff_rescale_signed(int i, struct hid_field *field) 202{ 203 return i == 0 ? 0 : i > 204 0 ? i * field->logical_maximum / 0x7fff : i * 205 field->logical_minimum / -0x8000; 206} 207 208static void pidff_set(struct pidff_usage *usage, u16 value) 209{ 210 usage->value[0] = pidff_rescale(value, 0xffff, usage->field); 211 pr_debug("calculated from %d to %d\n", value, usage->value[0]); 212} 213 214static void pidff_set_signed(struct pidff_usage *usage, s16 value) 215{ 216 if (usage->field->logical_minimum < 0) 217 usage->value[0] = pidff_rescale_signed(value, usage->field); 218 else { 219 if (value < 0) 220 usage->value[0] = 221 pidff_rescale(-value, 0x8000, usage->field); 222 else 223 usage->value[0] = 224 pidff_rescale(value, 0x7fff, usage->field); 225 } 226 pr_debug("calculated from %d to %d\n", value, usage->value[0]); 227} 228 229/* 230 * Send envelope report to the device 231 */ 232static void pidff_set_envelope_report(struct pidff_device *pidff, 233 struct ff_envelope *envelope) 234{ 235 pidff->set_envelope[PID_EFFECT_BLOCK_INDEX].value[0] = 236 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0]; 237 238 pidff->set_envelope[PID_ATTACK_LEVEL].value[0] = 239 pidff_rescale(envelope->attack_level > 240 0x7fff ? 0x7fff : envelope->attack_level, 0x7fff, 241 pidff->set_envelope[PID_ATTACK_LEVEL].field); 242 pidff->set_envelope[PID_FADE_LEVEL].value[0] = 243 pidff_rescale(envelope->fade_level > 244 0x7fff ? 0x7fff : envelope->fade_level, 0x7fff, 245 pidff->set_envelope[PID_FADE_LEVEL].field); 246 247 pidff->set_envelope[PID_ATTACK_TIME].value[0] = envelope->attack_length; 248 pidff->set_envelope[PID_FADE_TIME].value[0] = envelope->fade_length; 249 250 hid_dbg(pidff->hid, "attack %u => %d\n", 251 envelope->attack_level, 252 pidff->set_envelope[PID_ATTACK_LEVEL].value[0]); 253 254 hid_hw_request(pidff->hid, pidff->reports[PID_SET_ENVELOPE], 255 HID_REQ_SET_REPORT); 256} 257 258/* 259 * Test if the new envelope differs from old one 260 */ 261static int pidff_needs_set_envelope(struct ff_envelope *envelope, 262 struct ff_envelope *old) 263{ 264 return envelope->attack_level != old->attack_level || 265 envelope->fade_level != old->fade_level || 266 envelope->attack_length != old->attack_length || 267 envelope->fade_length != old->fade_length; 268} 269 270/* 271 * Send constant force report to the device 272 */ 273static void pidff_set_constant_force_report(struct pidff_device *pidff, 274 struct ff_effect *effect) 275{ 276 pidff->set_constant[PID_EFFECT_BLOCK_INDEX].value[0] = 277 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0]; 278 pidff_set_signed(&pidff->set_constant[PID_MAGNITUDE], 279 effect->u.constant.level); 280 281 hid_hw_request(pidff->hid, pidff->reports[PID_SET_CONSTANT], 282 HID_REQ_SET_REPORT); 283} 284 285/* 286 * Test if the constant parameters have changed between effects 287 */ 288static int pidff_needs_set_constant(struct ff_effect *effect, 289 struct ff_effect *old) 290{ 291 return effect->u.constant.level != old->u.constant.level; 292} 293 294/* 295 * Send set effect report to the device 296 */ 297static void pidff_set_effect_report(struct pidff_device *pidff, 298 struct ff_effect *effect) 299{ 300 pidff->set_effect[PID_EFFECT_BLOCK_INDEX].value[0] = 301 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0]; 302 pidff->set_effect_type->value[0] = 303 pidff->create_new_effect_type->value[0]; 304 pidff->set_effect[PID_DURATION].value[0] = effect->replay.length; 305 pidff->set_effect[PID_TRIGGER_BUTTON].value[0] = effect->trigger.button; 306 pidff->set_effect[PID_TRIGGER_REPEAT_INT].value[0] = 307 effect->trigger.interval; 308 pidff->set_effect[PID_GAIN].value[0] = 309 pidff->set_effect[PID_GAIN].field->logical_maximum; 310 pidff->set_effect[PID_DIRECTION_ENABLE].value[0] = 1; 311 pidff->effect_direction->value[0] = 312 pidff_rescale(effect->direction, 0xffff, 313 pidff->effect_direction); 314 pidff->set_effect[PID_START_DELAY].value[0] = effect->replay.delay; 315 316 hid_hw_request(pidff->hid, pidff->reports[PID_SET_EFFECT], 317 HID_REQ_SET_REPORT); 318} 319 320/* 321 * Test if the values used in set_effect have changed 322 */ 323static int pidff_needs_set_effect(struct ff_effect *effect, 324 struct ff_effect *old) 325{ 326 return effect->replay.length != old->replay.length || 327 effect->trigger.interval != old->trigger.interval || 328 effect->trigger.button != old->trigger.button || 329 effect->direction != old->direction || 330 effect->replay.delay != old->replay.delay; 331} 332 333/* 334 * Send periodic effect report to the device 335 */ 336static void pidff_set_periodic_report(struct pidff_device *pidff, 337 struct ff_effect *effect) 338{ 339 pidff->set_periodic[PID_EFFECT_BLOCK_INDEX].value[0] = 340 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0]; 341 pidff_set_signed(&pidff->set_periodic[PID_MAGNITUDE], 342 effect->u.periodic.magnitude); 343 pidff_set_signed(&pidff->set_periodic[PID_OFFSET], 344 effect->u.periodic.offset); 345 pidff_set(&pidff->set_periodic[PID_PHASE], effect->u.periodic.phase); 346 pidff->set_periodic[PID_PERIOD].value[0] = effect->u.periodic.period; 347 348 hid_hw_request(pidff->hid, pidff->reports[PID_SET_PERIODIC], 349 HID_REQ_SET_REPORT); 350 351} 352 353/* 354 * Test if periodic effect parameters have changed 355 */ 356static int pidff_needs_set_periodic(struct ff_effect *effect, 357 struct ff_effect *old) 358{ 359 return effect->u.periodic.magnitude != old->u.periodic.magnitude || 360 effect->u.periodic.offset != old->u.periodic.offset || 361 effect->u.periodic.phase != old->u.periodic.phase || 362 effect->u.periodic.period != old->u.periodic.period; 363} 364 365/* 366 * Send condition effect reports to the device 367 */ 368static void pidff_set_condition_report(struct pidff_device *pidff, 369 struct ff_effect *effect) 370{ 371 int i; 372 373 pidff->set_condition[PID_EFFECT_BLOCK_INDEX].value[0] = 374 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0]; 375 376 for (i = 0; i < 2; i++) { 377 pidff->set_condition[PID_PARAM_BLOCK_OFFSET].value[0] = i; 378 pidff_set_signed(&pidff->set_condition[PID_CP_OFFSET], 379 effect->u.condition[i].center); 380 pidff_set_signed(&pidff->set_condition[PID_POS_COEFFICIENT], 381 effect->u.condition[i].right_coeff); 382 pidff_set_signed(&pidff->set_condition[PID_NEG_COEFFICIENT], 383 effect->u.condition[i].left_coeff); 384 pidff_set(&pidff->set_condition[PID_POS_SATURATION], 385 effect->u.condition[i].right_saturation); 386 pidff_set(&pidff->set_condition[PID_NEG_SATURATION], 387 effect->u.condition[i].left_saturation); 388 pidff_set(&pidff->set_condition[PID_DEAD_BAND], 389 effect->u.condition[i].deadband); 390 hid_hw_request(pidff->hid, pidff->reports[PID_SET_CONDITION], 391 HID_REQ_SET_REPORT); 392 } 393} 394 395/* 396 * Test if condition effect parameters have changed 397 */ 398static int pidff_needs_set_condition(struct ff_effect *effect, 399 struct ff_effect *old) 400{ 401 int i; 402 int ret = 0; 403 404 for (i = 0; i < 2; i++) { 405 struct ff_condition_effect *cond = &effect->u.condition[i]; 406 struct ff_condition_effect *old_cond = &old->u.condition[i]; 407 408 ret |= cond->center != old_cond->center || 409 cond->right_coeff != old_cond->right_coeff || 410 cond->left_coeff != old_cond->left_coeff || 411 cond->right_saturation != old_cond->right_saturation || 412 cond->left_saturation != old_cond->left_saturation || 413 cond->deadband != old_cond->deadband; 414 } 415 416 return ret; 417} 418 419/* 420 * Send ramp force report to the device 421 */ 422static void pidff_set_ramp_force_report(struct pidff_device *pidff, 423 struct ff_effect *effect) 424{ 425 pidff->set_ramp[PID_EFFECT_BLOCK_INDEX].value[0] = 426 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0]; 427 pidff_set_signed(&pidff->set_ramp[PID_RAMP_START], 428 effect->u.ramp.start_level); 429 pidff_set_signed(&pidff->set_ramp[PID_RAMP_END], 430 effect->u.ramp.end_level); 431 hid_hw_request(pidff->hid, pidff->reports[PID_SET_RAMP], 432 HID_REQ_SET_REPORT); 433} 434 435/* 436 * Test if ramp force parameters have changed 437 */ 438static int pidff_needs_set_ramp(struct ff_effect *effect, struct ff_effect *old) 439{ 440 return effect->u.ramp.start_level != old->u.ramp.start_level || 441 effect->u.ramp.end_level != old->u.ramp.end_level; 442} 443 444/* 445 * Send a request for effect upload to the device 446 * 447 * Returns 0 if device reported success, -ENOSPC if the device reported memory 448 * is full. Upon unknown response the function will retry for 60 times, if 449 * still unsuccessful -EIO is returned. 450 */ 451static int pidff_request_effect_upload(struct pidff_device *pidff, int efnum) 452{ 453 int j; 454 455 pidff->create_new_effect_type->value[0] = efnum; 456 hid_hw_request(pidff->hid, pidff->reports[PID_CREATE_NEW_EFFECT], 457 HID_REQ_SET_REPORT); 458 hid_dbg(pidff->hid, "create_new_effect sent, type: %d\n", efnum); 459 460 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] = 0; 461 pidff->block_load_status->value[0] = 0; 462 hid_hw_wait(pidff->hid); 463 464 for (j = 0; j < 60; j++) { 465 hid_dbg(pidff->hid, "pid_block_load requested\n"); 466 hid_hw_request(pidff->hid, pidff->reports[PID_BLOCK_LOAD], 467 HID_REQ_GET_REPORT); 468 hid_hw_wait(pidff->hid); 469 if (pidff->block_load_status->value[0] == 470 pidff->status_id[PID_BLOCK_LOAD_SUCCESS]) { 471 hid_dbg(pidff->hid, "device reported free memory: %d bytes\n", 472 pidff->block_load[PID_RAM_POOL_AVAILABLE].value ? 473 pidff->block_load[PID_RAM_POOL_AVAILABLE].value[0] : -1); 474 return 0; 475 } 476 if (pidff->block_load_status->value[0] == 477 pidff->status_id[PID_BLOCK_LOAD_FULL]) { 478 hid_dbg(pidff->hid, "not enough memory free: %d bytes\n", 479 pidff->block_load[PID_RAM_POOL_AVAILABLE].value ? 480 pidff->block_load[PID_RAM_POOL_AVAILABLE].value[0] : -1); 481 return -ENOSPC; 482 } 483 } 484 hid_err(pidff->hid, "pid_block_load failed 60 times\n"); 485 return -EIO; 486} 487 488/* 489 * Play the effect with PID id n times 490 */ 491static void pidff_playback_pid(struct pidff_device *pidff, int pid_id, int n) 492{ 493 pidff->effect_operation[PID_EFFECT_BLOCK_INDEX].value[0] = pid_id; 494 495 if (n == 0) { 496 pidff->effect_operation_status->value[0] = 497 pidff->operation_id[PID_EFFECT_STOP]; 498 } else { 499 pidff->effect_operation_status->value[0] = 500 pidff->operation_id[PID_EFFECT_START]; 501 pidff->effect_operation[PID_LOOP_COUNT].value[0] = n; 502 } 503 504 hid_hw_request(pidff->hid, pidff->reports[PID_EFFECT_OPERATION], 505 HID_REQ_SET_REPORT); 506} 507 508/* 509 * Play the effect with effect id @effect_id for @value times 510 */ 511static int pidff_playback(struct input_dev *dev, int effect_id, int value) 512{ 513 struct pidff_device *pidff = dev->ff->private; 514 515 pidff_playback_pid(pidff, pidff->pid_id[effect_id], value); 516 517 return 0; 518} 519 520/* 521 * Erase effect with PID id 522 */ 523static void pidff_erase_pid(struct pidff_device *pidff, int pid_id) 524{ 525 pidff->block_free[PID_EFFECT_BLOCK_INDEX].value[0] = pid_id; 526 hid_hw_request(pidff->hid, pidff->reports[PID_BLOCK_FREE], 527 HID_REQ_SET_REPORT); 528} 529 530/* 531 * Stop and erase effect with effect_id 532 */ 533static int pidff_erase_effect(struct input_dev *dev, int effect_id) 534{ 535 struct pidff_device *pidff = dev->ff->private; 536 int pid_id = pidff->pid_id[effect_id]; 537 538 hid_dbg(pidff->hid, "starting to erase %d/%d\n", 539 effect_id, pidff->pid_id[effect_id]); 540 /* Wait for the queue to clear. We do not want a full fifo to 541 prevent the effect removal. */ 542 hid_hw_wait(pidff->hid); 543 pidff_playback_pid(pidff, pid_id, 0); 544 pidff_erase_pid(pidff, pid_id); 545 546 return 0; 547} 548 549/* 550 * Effect upload handler 551 */ 552static int pidff_upload_effect(struct input_dev *dev, struct ff_effect *effect, 553 struct ff_effect *old) 554{ 555 struct pidff_device *pidff = dev->ff->private; 556 int type_id; 557 int error; 558 559 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] = 0; 560 if (old) { 561 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] = 562 pidff->pid_id[effect->id]; 563 } 564 565 switch (effect->type) { 566 case FF_CONSTANT: 567 if (!old) { 568 error = pidff_request_effect_upload(pidff, 569 pidff->type_id[PID_CONSTANT]); 570 if (error) 571 return error; 572 } 573 if (!old || pidff_needs_set_effect(effect, old)) 574 pidff_set_effect_report(pidff, effect); 575 if (!old || pidff_needs_set_constant(effect, old)) 576 pidff_set_constant_force_report(pidff, effect); 577 if (!old || 578 pidff_needs_set_envelope(&effect->u.constant.envelope, 579 &old->u.constant.envelope)) 580 pidff_set_envelope_report(pidff, 581 &effect->u.constant.envelope); 582 break; 583 584 case FF_PERIODIC: 585 if (!old) { 586 switch (effect->u.periodic.waveform) { 587 case FF_SQUARE: 588 type_id = PID_SQUARE; 589 break; 590 case FF_TRIANGLE: 591 type_id = PID_TRIANGLE; 592 break; 593 case FF_SINE: 594 type_id = PID_SINE; 595 break; 596 case FF_SAW_UP: 597 type_id = PID_SAW_UP; 598 break; 599 case FF_SAW_DOWN: 600 type_id = PID_SAW_DOWN; 601 break; 602 default: 603 hid_err(pidff->hid, "invalid waveform\n"); 604 return -EINVAL; 605 } 606 607 error = pidff_request_effect_upload(pidff, 608 pidff->type_id[type_id]); 609 if (error) 610 return error; 611 } 612 if (!old || pidff_needs_set_effect(effect, old)) 613 pidff_set_effect_report(pidff, effect); 614 if (!old || pidff_needs_set_periodic(effect, old)) 615 pidff_set_periodic_report(pidff, effect); 616 if (!old || 617 pidff_needs_set_envelope(&effect->u.periodic.envelope, 618 &old->u.periodic.envelope)) 619 pidff_set_envelope_report(pidff, 620 &effect->u.periodic.envelope); 621 break; 622 623 case FF_RAMP: 624 if (!old) { 625 error = pidff_request_effect_upload(pidff, 626 pidff->type_id[PID_RAMP]); 627 if (error) 628 return error; 629 } 630 if (!old || pidff_needs_set_effect(effect, old)) 631 pidff_set_effect_report(pidff, effect); 632 if (!old || pidff_needs_set_ramp(effect, old)) 633 pidff_set_ramp_force_report(pidff, effect); 634 if (!old || 635 pidff_needs_set_envelope(&effect->u.ramp.envelope, 636 &old->u.ramp.envelope)) 637 pidff_set_envelope_report(pidff, 638 &effect->u.ramp.envelope); 639 break; 640 641 case FF_SPRING: 642 if (!old) { 643 error = pidff_request_effect_upload(pidff, 644 pidff->type_id[PID_SPRING]); 645 if (error) 646 return error; 647 } 648 if (!old || pidff_needs_set_effect(effect, old)) 649 pidff_set_effect_report(pidff, effect); 650 if (!old || pidff_needs_set_condition(effect, old)) 651 pidff_set_condition_report(pidff, effect); 652 break; 653 654 case FF_FRICTION: 655 if (!old) { 656 error = pidff_request_effect_upload(pidff, 657 pidff->type_id[PID_FRICTION]); 658 if (error) 659 return error; 660 } 661 if (!old || pidff_needs_set_effect(effect, old)) 662 pidff_set_effect_report(pidff, effect); 663 if (!old || pidff_needs_set_condition(effect, old)) 664 pidff_set_condition_report(pidff, effect); 665 break; 666 667 case FF_DAMPER: 668 if (!old) { 669 error = pidff_request_effect_upload(pidff, 670 pidff->type_id[PID_DAMPER]); 671 if (error) 672 return error; 673 } 674 if (!old || pidff_needs_set_effect(effect, old)) 675 pidff_set_effect_report(pidff, effect); 676 if (!old || pidff_needs_set_condition(effect, old)) 677 pidff_set_condition_report(pidff, effect); 678 break; 679 680 case FF_INERTIA: 681 if (!old) { 682 error = pidff_request_effect_upload(pidff, 683 pidff->type_id[PID_INERTIA]); 684 if (error) 685 return error; 686 } 687 if (!old || pidff_needs_set_effect(effect, old)) 688 pidff_set_effect_report(pidff, effect); 689 if (!old || pidff_needs_set_condition(effect, old)) 690 pidff_set_condition_report(pidff, effect); 691 break; 692 693 default: 694 hid_err(pidff->hid, "invalid type\n"); 695 return -EINVAL; 696 } 697 698 if (!old) 699 pidff->pid_id[effect->id] = 700 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0]; 701 702 hid_dbg(pidff->hid, "uploaded\n"); 703 704 return 0; 705} 706 707/* 708 * set_gain() handler 709 */ 710static void pidff_set_gain(struct input_dev *dev, u16 gain) 711{ 712 struct pidff_device *pidff = dev->ff->private; 713 714 pidff_set(&pidff->device_gain[PID_DEVICE_GAIN_FIELD], gain); 715 hid_hw_request(pidff->hid, pidff->reports[PID_DEVICE_GAIN], 716 HID_REQ_SET_REPORT); 717} 718 719static void pidff_autocenter(struct pidff_device *pidff, u16 magnitude) 720{ 721 struct hid_field *field = 722 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field; 723 724 if (!magnitude) { 725 pidff_playback_pid(pidff, field->logical_minimum, 0); 726 return; 727 } 728 729 pidff_playback_pid(pidff, field->logical_minimum, 1); 730 731 pidff->set_effect[PID_EFFECT_BLOCK_INDEX].value[0] = 732 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum; 733 pidff->set_effect_type->value[0] = pidff->type_id[PID_SPRING]; 734 pidff->set_effect[PID_DURATION].value[0] = 0; 735 pidff->set_effect[PID_TRIGGER_BUTTON].value[0] = 0; 736 pidff->set_effect[PID_TRIGGER_REPEAT_INT].value[0] = 0; 737 pidff_set(&pidff->set_effect[PID_GAIN], magnitude); 738 pidff->set_effect[PID_DIRECTION_ENABLE].value[0] = 1; 739 pidff->set_effect[PID_START_DELAY].value[0] = 0; 740 741 hid_hw_request(pidff->hid, pidff->reports[PID_SET_EFFECT], 742 HID_REQ_SET_REPORT); 743} 744 745/* 746 * pidff_set_autocenter() handler 747 */ 748static void pidff_set_autocenter(struct input_dev *dev, u16 magnitude) 749{ 750 struct pidff_device *pidff = dev->ff->private; 751 752 pidff_autocenter(pidff, magnitude); 753} 754 755/* 756 * Find fields from a report and fill a pidff_usage 757 */ 758static int pidff_find_fields(struct pidff_usage *usage, const u8 *table, 759 struct hid_report *report, int count, int strict) 760{ 761 int i, j, k, found; 762 763 for (k = 0; k < count; k++) { 764 found = 0; 765 for (i = 0; i < report->maxfield; i++) { 766 if (report->field[i]->maxusage != 767 report->field[i]->report_count) { 768 pr_debug("maxusage and report_count do not match, skipping\n"); 769 continue; 770 } 771 for (j = 0; j < report->field[i]->maxusage; j++) { 772 if (report->field[i]->usage[j].hid == 773 (HID_UP_PID | table[k])) { 774 pr_debug("found %d at %d->%d\n", 775 k, i, j); 776 usage[k].field = report->field[i]; 777 usage[k].value = 778 &report->field[i]->value[j]; 779 found = 1; 780 break; 781 } 782 } 783 if (found) 784 break; 785 } 786 if (!found && strict) { 787 pr_debug("failed to locate %d\n", k); 788 return -1; 789 } 790 } 791 return 0; 792} 793 794/* 795 * Return index into pidff_reports for the given usage 796 */ 797static int pidff_check_usage(int usage) 798{ 799 int i; 800 801 for (i = 0; i < sizeof(pidff_reports); i++) 802 if (usage == (HID_UP_PID | pidff_reports[i])) 803 return i; 804 805 return -1; 806} 807 808/* 809 * Find the reports and fill pidff->reports[] 810 * report_type specifies either OUTPUT or FEATURE reports 811 */ 812static void pidff_find_reports(struct hid_device *hid, int report_type, 813 struct pidff_device *pidff) 814{ 815 struct hid_report *report; 816 int i, ret; 817 818 list_for_each_entry(report, 819 &hid->report_enum[report_type].report_list, list) { 820 if (report->maxfield < 1) 821 continue; 822 ret = pidff_check_usage(report->field[0]->logical); 823 if (ret != -1) { 824 hid_dbg(hid, "found usage 0x%02x from field->logical\n", 825 pidff_reports[ret]); 826 pidff->reports[ret] = report; 827 continue; 828 } 829 830 /* 831 * Sometimes logical collections are stacked to indicate 832 * different usages for the report and the field, in which 833 * case we want the usage of the parent. However, Linux HID 834 * implementation hides this fact, so we have to dig it up 835 * ourselves 836 */ 837 i = report->field[0]->usage[0].collection_index; 838 if (i <= 0 || 839 hid->collection[i - 1].type != HID_COLLECTION_LOGICAL) 840 continue; 841 ret = pidff_check_usage(hid->collection[i - 1].usage); 842 if (ret != -1 && !pidff->reports[ret]) { 843 hid_dbg(hid, 844 "found usage 0x%02x from collection array\n", 845 pidff_reports[ret]); 846 pidff->reports[ret] = report; 847 } 848 } 849} 850 851/* 852 * Test if the required reports have been found 853 */ 854static int pidff_reports_ok(struct pidff_device *pidff) 855{ 856 int i; 857 858 for (i = 0; i <= PID_REQUIRED_REPORTS; i++) { 859 if (!pidff->reports[i]) { 860 hid_dbg(pidff->hid, "%d missing\n", i); 861 return 0; 862 } 863 } 864 865 return 1; 866} 867 868/* 869 * Find a field with a specific usage within a report 870 */ 871static struct hid_field *pidff_find_special_field(struct hid_report *report, 872 int usage, int enforce_min) 873{ 874 int i; 875 876 for (i = 0; i < report->maxfield; i++) { 877 if (report->field[i]->logical == (HID_UP_PID | usage) && 878 report->field[i]->report_count > 0) { 879 if (!enforce_min || 880 report->field[i]->logical_minimum == 1) 881 return report->field[i]; 882 else { 883 pr_err("logical_minimum is not 1 as it should be\n"); 884 return NULL; 885 } 886 } 887 } 888 return NULL; 889} 890 891/* 892 * Fill a pidff->*_id struct table 893 */ 894static int pidff_find_special_keys(int *keys, struct hid_field *fld, 895 const u8 *usagetable, int count) 896{ 897 898 int i, j; 899 int found = 0; 900 901 for (i = 0; i < count; i++) { 902 for (j = 0; j < fld->maxusage; j++) { 903 if (fld->usage[j].hid == (HID_UP_PID | usagetable[i])) { 904 keys[i] = j + 1; 905 found++; 906 break; 907 } 908 } 909 } 910 return found; 911} 912 913#define PIDFF_FIND_SPECIAL_KEYS(keys, field, name) \ 914 pidff_find_special_keys(pidff->keys, pidff->field, pidff_ ## name, \ 915 sizeof(pidff_ ## name)) 916 917/* 918 * Find and check the special fields 919 */ 920static int pidff_find_special_fields(struct pidff_device *pidff) 921{ 922 hid_dbg(pidff->hid, "finding special fields\n"); 923 924 pidff->create_new_effect_type = 925 pidff_find_special_field(pidff->reports[PID_CREATE_NEW_EFFECT], 926 0x25, 1); 927 pidff->set_effect_type = 928 pidff_find_special_field(pidff->reports[PID_SET_EFFECT], 929 0x25, 1); 930 pidff->effect_direction = 931 pidff_find_special_field(pidff->reports[PID_SET_EFFECT], 932 0x57, 0); 933 pidff->device_control = 934 pidff_find_special_field(pidff->reports[PID_DEVICE_CONTROL], 935 0x96, 1); 936 pidff->block_load_status = 937 pidff_find_special_field(pidff->reports[PID_BLOCK_LOAD], 938 0x8b, 1); 939 pidff->effect_operation_status = 940 pidff_find_special_field(pidff->reports[PID_EFFECT_OPERATION], 941 0x78, 1); 942 943 hid_dbg(pidff->hid, "search done\n"); 944 945 if (!pidff->create_new_effect_type || !pidff->set_effect_type) { 946 hid_err(pidff->hid, "effect lists not found\n"); 947 return -1; 948 } 949 950 if (!pidff->effect_direction) { 951 hid_err(pidff->hid, "direction field not found\n"); 952 return -1; 953 } 954 955 if (!pidff->device_control) { 956 hid_err(pidff->hid, "device control field not found\n"); 957 return -1; 958 } 959 960 if (!pidff->block_load_status) { 961 hid_err(pidff->hid, "block load status field not found\n"); 962 return -1; 963 } 964 965 if (!pidff->effect_operation_status) { 966 hid_err(pidff->hid, "effect operation field not found\n"); 967 return -1; 968 } 969 970 pidff_find_special_keys(pidff->control_id, pidff->device_control, 971 pidff_device_control, 972 sizeof(pidff_device_control)); 973 974 PIDFF_FIND_SPECIAL_KEYS(control_id, device_control, device_control); 975 976 if (!PIDFF_FIND_SPECIAL_KEYS(type_id, create_new_effect_type, 977 effect_types)) { 978 hid_err(pidff->hid, "no effect types found\n"); 979 return -1; 980 } 981 982 if (PIDFF_FIND_SPECIAL_KEYS(status_id, block_load_status, 983 block_load_status) != 984 sizeof(pidff_block_load_status)) { 985 hid_err(pidff->hid, 986 "block load status identifiers not found\n"); 987 return -1; 988 } 989 990 if (PIDFF_FIND_SPECIAL_KEYS(operation_id, effect_operation_status, 991 effect_operation_status) != 992 sizeof(pidff_effect_operation_status)) { 993 hid_err(pidff->hid, "effect operation identifiers not found\n"); 994 return -1; 995 } 996 997 return 0; 998} 999 1000/* 1001 * Find the implemented effect types 1002 */ 1003static int pidff_find_effects(struct pidff_device *pidff, 1004 struct input_dev *dev) 1005{ 1006 int i; 1007 1008 for (i = 0; i < sizeof(pidff_effect_types); i++) { 1009 int pidff_type = pidff->type_id[i]; 1010 if (pidff->set_effect_type->usage[pidff_type].hid != 1011 pidff->create_new_effect_type->usage[pidff_type].hid) { 1012 hid_err(pidff->hid, 1013 "effect type number %d is invalid\n", i); 1014 return -1; 1015 } 1016 } 1017 1018 if (pidff->type_id[PID_CONSTANT]) 1019 set_bit(FF_CONSTANT, dev->ffbit); 1020 if (pidff->type_id[PID_RAMP]) 1021 set_bit(FF_RAMP, dev->ffbit); 1022 if (pidff->type_id[PID_SQUARE]) { 1023 set_bit(FF_SQUARE, dev->ffbit); 1024 set_bit(FF_PERIODIC, dev->ffbit); 1025 } 1026 if (pidff->type_id[PID_SINE]) { 1027 set_bit(FF_SINE, dev->ffbit); 1028 set_bit(FF_PERIODIC, dev->ffbit); 1029 } 1030 if (pidff->type_id[PID_TRIANGLE]) { 1031 set_bit(FF_TRIANGLE, dev->ffbit); 1032 set_bit(FF_PERIODIC, dev->ffbit); 1033 } 1034 if (pidff->type_id[PID_SAW_UP]) { 1035 set_bit(FF_SAW_UP, dev->ffbit); 1036 set_bit(FF_PERIODIC, dev->ffbit); 1037 } 1038 if (pidff->type_id[PID_SAW_DOWN]) { 1039 set_bit(FF_SAW_DOWN, dev->ffbit); 1040 set_bit(FF_PERIODIC, dev->ffbit); 1041 } 1042 if (pidff->type_id[PID_SPRING]) 1043 set_bit(FF_SPRING, dev->ffbit); 1044 if (pidff->type_id[PID_DAMPER]) 1045 set_bit(FF_DAMPER, dev->ffbit); 1046 if (pidff->type_id[PID_INERTIA]) 1047 set_bit(FF_INERTIA, dev->ffbit); 1048 if (pidff->type_id[PID_FRICTION]) 1049 set_bit(FF_FRICTION, dev->ffbit); 1050 1051 return 0; 1052 1053} 1054 1055#define PIDFF_FIND_FIELDS(name, report, strict) \ 1056 pidff_find_fields(pidff->name, pidff_ ## name, \ 1057 pidff->reports[report], \ 1058 sizeof(pidff_ ## name), strict) 1059 1060/* 1061 * Fill and check the pidff_usages 1062 */ 1063static int pidff_init_fields(struct pidff_device *pidff, struct input_dev *dev) 1064{ 1065 int envelope_ok = 0; 1066 1067 if (PIDFF_FIND_FIELDS(set_effect, PID_SET_EFFECT, 1)) { 1068 hid_err(pidff->hid, "unknown set_effect report layout\n"); 1069 return -ENODEV; 1070 } 1071 1072 PIDFF_FIND_FIELDS(block_load, PID_BLOCK_LOAD, 0); 1073 if (!pidff->block_load[PID_EFFECT_BLOCK_INDEX].value) { 1074 hid_err(pidff->hid, "unknown pid_block_load report layout\n"); 1075 return -ENODEV; 1076 } 1077 1078 if (PIDFF_FIND_FIELDS(effect_operation, PID_EFFECT_OPERATION, 1)) { 1079 hid_err(pidff->hid, "unknown effect_operation report layout\n"); 1080 return -ENODEV; 1081 } 1082 1083 if (PIDFF_FIND_FIELDS(block_free, PID_BLOCK_FREE, 1)) { 1084 hid_err(pidff->hid, "unknown pid_block_free report layout\n"); 1085 return -ENODEV; 1086 } 1087 1088 if (!PIDFF_FIND_FIELDS(set_envelope, PID_SET_ENVELOPE, 1)) 1089 envelope_ok = 1; 1090 1091 if (pidff_find_special_fields(pidff) || pidff_find_effects(pidff, dev)) 1092 return -ENODEV; 1093 1094 if (!envelope_ok) { 1095 if (test_and_clear_bit(FF_CONSTANT, dev->ffbit)) 1096 hid_warn(pidff->hid, 1097 "has constant effect but no envelope\n"); 1098 if (test_and_clear_bit(FF_RAMP, dev->ffbit)) 1099 hid_warn(pidff->hid, 1100 "has ramp effect but no envelope\n"); 1101 1102 if (test_and_clear_bit(FF_PERIODIC, dev->ffbit)) 1103 hid_warn(pidff->hid, 1104 "has periodic effect but no envelope\n"); 1105 } 1106 1107 if (test_bit(FF_CONSTANT, dev->ffbit) && 1108 PIDFF_FIND_FIELDS(set_constant, PID_SET_CONSTANT, 1)) { 1109 hid_warn(pidff->hid, "unknown constant effect layout\n"); 1110 clear_bit(FF_CONSTANT, dev->ffbit); 1111 } 1112 1113 if (test_bit(FF_RAMP, dev->ffbit) && 1114 PIDFF_FIND_FIELDS(set_ramp, PID_SET_RAMP, 1)) { 1115 hid_warn(pidff->hid, "unknown ramp effect layout\n"); 1116 clear_bit(FF_RAMP, dev->ffbit); 1117 } 1118 1119 if ((test_bit(FF_SPRING, dev->ffbit) || 1120 test_bit(FF_DAMPER, dev->ffbit) || 1121 test_bit(FF_FRICTION, dev->ffbit) || 1122 test_bit(FF_INERTIA, dev->ffbit)) && 1123 PIDFF_FIND_FIELDS(set_condition, PID_SET_CONDITION, 1)) { 1124 hid_warn(pidff->hid, "unknown condition effect layout\n"); 1125 clear_bit(FF_SPRING, dev->ffbit); 1126 clear_bit(FF_DAMPER, dev->ffbit); 1127 clear_bit(FF_FRICTION, dev->ffbit); 1128 clear_bit(FF_INERTIA, dev->ffbit); 1129 } 1130 1131 if (test_bit(FF_PERIODIC, dev->ffbit) && 1132 PIDFF_FIND_FIELDS(set_periodic, PID_SET_PERIODIC, 1)) { 1133 hid_warn(pidff->hid, "unknown periodic effect layout\n"); 1134 clear_bit(FF_PERIODIC, dev->ffbit); 1135 } 1136 1137 PIDFF_FIND_FIELDS(pool, PID_POOL, 0); 1138 1139 if (!PIDFF_FIND_FIELDS(device_gain, PID_DEVICE_GAIN, 1)) 1140 set_bit(FF_GAIN, dev->ffbit); 1141 1142 return 0; 1143} 1144 1145/* 1146 * Reset the device 1147 */ 1148static void pidff_reset(struct pidff_device *pidff) 1149{ 1150 struct hid_device *hid = pidff->hid; 1151 int i = 0; 1152 1153 pidff->device_control->value[0] = pidff->control_id[PID_RESET]; 1154 /* We reset twice as sometimes hid_wait_io isn't waiting long enough */ 1155 hid_hw_request(hid, pidff->reports[PID_DEVICE_CONTROL], HID_REQ_SET_REPORT); 1156 hid_hw_wait(hid); 1157 hid_hw_request(hid, pidff->reports[PID_DEVICE_CONTROL], HID_REQ_SET_REPORT); 1158 hid_hw_wait(hid); 1159 1160 pidff->device_control->value[0] = 1161 pidff->control_id[PID_ENABLE_ACTUATORS]; 1162 hid_hw_request(hid, pidff->reports[PID_DEVICE_CONTROL], HID_REQ_SET_REPORT); 1163 hid_hw_wait(hid); 1164 1165 /* pool report is sometimes messed up, refetch it */ 1166 hid_hw_request(hid, pidff->reports[PID_POOL], HID_REQ_GET_REPORT); 1167 hid_hw_wait(hid); 1168 1169 if (pidff->pool[PID_SIMULTANEOUS_MAX].value) { 1170 while (pidff->pool[PID_SIMULTANEOUS_MAX].value[0] < 2) { 1171 if (i++ > 20) { 1172 hid_warn(pidff->hid, 1173 "device reports %d simultaneous effects\n", 1174 pidff->pool[PID_SIMULTANEOUS_MAX].value[0]); 1175 break; 1176 } 1177 hid_dbg(pidff->hid, "pid_pool requested again\n"); 1178 hid_hw_request(hid, pidff->reports[PID_POOL], 1179 HID_REQ_GET_REPORT); 1180 hid_hw_wait(hid); 1181 } 1182 } 1183} 1184 1185/* 1186 * Test if autocenter modification is using the supported method 1187 */ 1188static int pidff_check_autocenter(struct pidff_device *pidff, 1189 struct input_dev *dev) 1190{ 1191 int error; 1192 1193 /* 1194 * Let's find out if autocenter modification is supported 1195 * Specification doesn't specify anything, so we request an 1196 * effect upload and cancel it immediately. If the approved 1197 * effect id was one above the minimum, then we assume the first 1198 * effect id is a built-in spring type effect used for autocenter 1199 */ 1200 1201 error = pidff_request_effect_upload(pidff, 1); 1202 if (error) { 1203 hid_err(pidff->hid, "upload request failed\n"); 1204 return error; 1205 } 1206 1207 if (pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] == 1208 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum + 1) { 1209 pidff_autocenter(pidff, 0xffff); 1210 set_bit(FF_AUTOCENTER, dev->ffbit); 1211 } else { 1212 hid_notice(pidff->hid, 1213 "device has unknown autocenter control method\n"); 1214 } 1215 1216 pidff_erase_pid(pidff, 1217 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0]); 1218 1219 return 0; 1220 1221} 1222 1223/* 1224 * Check if the device is PID and initialize it 1225 */ 1226int hid_pidff_init(struct hid_device *hid) 1227{ 1228 struct pidff_device *pidff; 1229 struct hid_input *hidinput = list_entry(hid->inputs.next, 1230 struct hid_input, list); 1231 struct input_dev *dev = hidinput->input; 1232 struct ff_device *ff; 1233 int max_effects; 1234 int error; 1235 1236 hid_dbg(hid, "starting pid init\n"); 1237 1238 if (list_empty(&hid->report_enum[HID_OUTPUT_REPORT].report_list)) { 1239 hid_dbg(hid, "not a PID device, no output report\n"); 1240 return -ENODEV; 1241 } 1242 1243 pidff = kzalloc(sizeof(*pidff), GFP_KERNEL); 1244 if (!pidff) 1245 return -ENOMEM; 1246 1247 pidff->hid = hid; 1248 1249 hid_device_io_start(hid); 1250 1251 pidff_find_reports(hid, HID_OUTPUT_REPORT, pidff); 1252 pidff_find_reports(hid, HID_FEATURE_REPORT, pidff); 1253 1254 if (!pidff_reports_ok(pidff)) { 1255 hid_dbg(hid, "reports not ok, aborting\n"); 1256 error = -ENODEV; 1257 goto fail; 1258 } 1259 1260 error = pidff_init_fields(pidff, dev); 1261 if (error) 1262 goto fail; 1263 1264 pidff_reset(pidff); 1265 1266 if (test_bit(FF_GAIN, dev->ffbit)) { 1267 pidff_set(&pidff->device_gain[PID_DEVICE_GAIN_FIELD], 0xffff); 1268 hid_hw_request(hid, pidff->reports[PID_DEVICE_GAIN], 1269 HID_REQ_SET_REPORT); 1270 } 1271 1272 error = pidff_check_autocenter(pidff, dev); 1273 if (error) 1274 goto fail; 1275 1276 max_effects = 1277 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_maximum - 1278 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum + 1279 1; 1280 hid_dbg(hid, "max effects is %d\n", max_effects); 1281 1282 if (max_effects > PID_EFFECTS_MAX) 1283 max_effects = PID_EFFECTS_MAX; 1284 1285 if (pidff->pool[PID_SIMULTANEOUS_MAX].value) 1286 hid_dbg(hid, "max simultaneous effects is %d\n", 1287 pidff->pool[PID_SIMULTANEOUS_MAX].value[0]); 1288 1289 if (pidff->pool[PID_RAM_POOL_SIZE].value) 1290 hid_dbg(hid, "device memory size is %d bytes\n", 1291 pidff->pool[PID_RAM_POOL_SIZE].value[0]); 1292 1293 if (pidff->pool[PID_DEVICE_MANAGED_POOL].value && 1294 pidff->pool[PID_DEVICE_MANAGED_POOL].value[0] == 0) { 1295 error = -EPERM; 1296 hid_notice(hid, 1297 "device does not support device managed pool\n"); 1298 goto fail; 1299 } 1300 1301 error = input_ff_create(dev, max_effects); 1302 if (error) 1303 goto fail; 1304 1305 ff = dev->ff; 1306 ff->private = pidff; 1307 ff->upload = pidff_upload_effect; 1308 ff->erase = pidff_erase_effect; 1309 ff->set_gain = pidff_set_gain; 1310 ff->set_autocenter = pidff_set_autocenter; 1311 ff->playback = pidff_playback; 1312 1313 hid_info(dev, "Force feedback for USB HID PID devices by Anssi Hannula <anssi.hannula@gmail.com>\n"); 1314 1315 hid_device_io_stop(hid); 1316 1317 return 0; 1318 1319 fail: 1320 hid_device_io_stop(hid); 1321 1322 kfree(pidff); 1323 return error; 1324} 1325