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