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 54static 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 60the 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 72static 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 80static 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 89static 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 97static const u8 pidff_set_periodic[] = { 0x22, 0x70, 0x6f, 0x71, 0x72 }; 98static const u8 pidff_set_constant[] = { 0x22, 0x70 }; 99 100#define PID_RAMP_START 1 101#define PID_RAMP_END 2 102static const u8 pidff_set_ramp[] = { 0x22, 0x75, 0x76 }; 103 104#define PID_RAM_POOL_AVAILABLE 1 105static const u8 pidff_block_load[] = { 0x22, 0xac }; 106 107#define PID_LOOP_COUNT 1 108static const u8 pidff_effect_operation[] = { 0x22, 0x7c }; 109 110static const u8 pidff_block_free[] = { 0x22 }; 111 112#define PID_DEVICE_GAIN_FIELD 0 113static 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 118static 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 124static 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 137static 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 144static const u8 pidff_block_load_status[] = { 0x8c, 0x8d }; 145 146#define PID_EFFECT_START 0 147#define PID_EFFECT_STOP 1 148static const u8 pidff_effect_operation_status[] = { 0x79, 0x7b }; 149 150struct pidff_usage { 151 struct hid_field *field; 152 s32 *value; 153}; 154 155struct 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 */ 203static 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 */ 212static 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 219static 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 225static 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 */ 243static 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 */ 271static 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 */ 283static 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 */ 298static 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 */ 307static 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 */ 333static 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 */ 346static 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 */ 366static 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 */ 378static 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 */ 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_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 */ 523static 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 */ 535static 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 */ 545static 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 */ 560static 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 */ 713static 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 722static 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 */ 750static 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 */ 760static 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 */ 799static 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 */ 814static 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 */ 855static 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 */ 872static 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 */ 896static 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 */ 922static 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 */ 1008static 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 */ 1068static 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 */ 1160static 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 */ 1201static 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 */ 1239int 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} 1332