git.oblomov.eu Git - linux-2.6/blob - drivers/hid/usbhid/hid-pidff.c

   1 /*
   2  *  Force feedback driver for USB HID PID compliant devices
   3  *
   4  *  Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23 /* #define DEBUG */
  24
  25 #define debug(format, arg...) pr_debug("hid-pidff: " format "\n" , ## arg)
  26
  27 #include <linux/input.h>
  28 #include <linux/usb.h>
  29
  30 #include <linux/hid.h>
  31
  32 #include "usbhid.h"
  33
  34 #define PID_EFFECTS_MAX         64
  35
  36 /* Report usage table used to put reports into an array */
  37
  38 #define PID_SET_EFFECT          0
  39 #define PID_EFFECT_OPERATION    1
  40 #define PID_DEVICE_GAIN         2
  41 #define PID_POOL                3
  42 #define PID_BLOCK_LOAD          4
  43 #define PID_BLOCK_FREE          5
  44 #define PID_DEVICE_CONTROL      6
  45 #define PID_CREATE_NEW_EFFECT   7
  46
  47 #define PID_REQUIRED_REPORTS    7
  48
  49 #define PID_SET_ENVELOPE        8
  50 #define PID_SET_CONDITION       9
  51 #define PID_SET_PERIODIC        10
  52 #define PID_SET_CONSTANT        11
  53 #define PID_SET_RAMP            12
  54 static const u8 pidff_reports[] = {
  55         0x21, 0x77, 0x7d, 0x7f, 0x89, 0x90, 0x96, 0xab,
  56         0x5a, 0x5f, 0x6e, 0x73, 0x74
  57 };
  58
  59 /* device_control is really 0x95, but 0x96 specified as it is the usage of
  60 the only field in that report */
  61
  62 /* Value usage tables used to put fields and values into arrays */
  63
  64 #define PID_EFFECT_BLOCK_INDEX  0
  65
  66 #define PID_DURATION            1
  67 #define PID_GAIN                2
  68 #define PID_TRIGGER_BUTTON      3
  69 #define PID_TRIGGER_REPEAT_INT  4
  70 #define PID_DIRECTION_ENABLE    5
  71 #define PID_START_DELAY         6
  72 static const u8 pidff_set_effect[] = {
  73         0x22, 0x50, 0x52, 0x53, 0x54, 0x56, 0xa7
  74 };
  75
  76 #define PID_ATTACK_LEVEL        1
  77 #define PID_ATTACK_TIME         2
  78 #define PID_FADE_LEVEL          3
  79 #define PID_FADE_TIME           4
  80 static const u8 pidff_set_envelope[] = { 0x22, 0x5b, 0x5c, 0x5d, 0x5e };
  81
  82 #define PID_PARAM_BLOCK_OFFSET  1
  83 #define PID_CP_OFFSET           2
  84 #define PID_POS_COEFFICIENT     3
  85 #define PID_NEG_COEFFICIENT     4
  86 #define PID_POS_SATURATION      5
  87 #define PID_NEG_SATURATION      6
  88 #define PID_DEAD_BAND           7
  89 static const u8 pidff_set_condition[] = {
  90         0x22, 0x23, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65
  91 };
  92
  93 #define PID_MAGNITUDE           1
  94 #define PID_OFFSET              2
  95 #define PID_PHASE               3
  96 #define PID_PERIOD              4
  97 static const u8 pidff_set_periodic[] = { 0x22, 0x70, 0x6f, 0x71, 0x72 };
  98 static const u8 pidff_set_constant[] = { 0x22, 0x70 };
  99
 100 #define PID_RAMP_START          1
 101 #define PID_RAMP_END            2
 102 static const u8 pidff_set_ramp[] = { 0x22, 0x75, 0x76 };
 103
 104 #define PID_RAM_POOL_AVAILABLE  1
 105 static const u8 pidff_block_load[] = { 0x22, 0xac };
 106
 107 #define PID_LOOP_COUNT          1
 108 static const u8 pidff_effect_operation[] = { 0x22, 0x7c };
 109
 110 static const u8 pidff_block_free[] = { 0x22 };
 111
 112 #define PID_DEVICE_GAIN_FIELD   0
 113 static const u8 pidff_device_gain[] = { 0x7e };
 114
 115 #define PID_RAM_POOL_SIZE       0
 116 #define PID_SIMULTANEOUS_MAX    1
 117 #define PID_DEVICE_MANAGED_POOL 2
 118 static const u8 pidff_pool[] = { 0x80, 0x83, 0xa9 };
 119
 120 /* Special field key tables used to put special field keys into arrays */
 121
 122 #define PID_ENABLE_ACTUATORS    0
 123 #define PID_RESET               1
 124 static const u8 pidff_device_control[] = { 0x97, 0x9a };
 125
 126 #define PID_CONSTANT    0
 127 #define PID_RAMP        1
 128 #define PID_SQUARE      2
 129 #define PID_SINE        3
 130 #define PID_TRIANGLE    4
 131 #define PID_SAW_UP      5
 132 #define PID_SAW_DOWN    6
 133 #define PID_SPRING      7
 134 #define PID_DAMPER      8
 135 #define PID_INERTIA     9
 136 #define PID_FRICTION    10
 137 static const u8 pidff_effect_types[] = {
 138         0x26, 0x27, 0x30, 0x31, 0x32, 0x33, 0x34,
 139         0x40, 0x41, 0x42, 0x43
 140 };
 141
 142 #define PID_BLOCK_LOAD_SUCCESS  0
 143 #define PID_BLOCK_LOAD_FULL     1
 144 static const u8 pidff_block_load_status[] = { 0x8c, 0x8d };
 145
 146 #define PID_EFFECT_START        0
 147 #define PID_EFFECT_STOP         1
 148 static const u8 pidff_effect_operation_status[] = { 0x79, 0x7b };
 149
 150 struct pidff_usage {
 151         struct hid_field *field;
 152         s32 *value;
 153 };
 154
 155 struct pidff_device {
 156         struct hid_device *hid;
 157
 158         struct hid_report *reports[sizeof(pidff_reports)];
 159
 160         struct pidff_usage set_effect[sizeof(pidff_set_effect)];
 161         struct pidff_usage set_envelope[sizeof(pidff_set_envelope)];
 162         struct pidff_usage set_condition[sizeof(pidff_set_condition)];
 163         struct pidff_usage set_periodic[sizeof(pidff_set_periodic)];
 164         struct pidff_usage set_constant[sizeof(pidff_set_constant)];
 165         struct pidff_usage set_ramp[sizeof(pidff_set_ramp)];
 166
 167         struct pidff_usage device_gain[sizeof(pidff_device_gain)];
 168         struct pidff_usage block_load[sizeof(pidff_block_load)];
 169         struct pidff_usage pool[sizeof(pidff_pool)];
 170         struct pidff_usage effect_operation[sizeof(pidff_effect_operation)];
 171         struct pidff_usage block_free[sizeof(pidff_block_free)];
 172
 173         /* Special field is a field that is not composed of
 174            usage<->value pairs that pidff_usage values are */
 175
 176         /* Special field in create_new_effect */
 177         struct hid_field *create_new_effect_type;
 178
 179         /* Special fields in set_effect */
 180         struct hid_field *set_effect_type;
 181         struct hid_field *effect_direction;
 182
 183         /* Special field in device_control */
 184         struct hid_field *device_control;
 185
 186         /* Special field in block_load */
 187         struct hid_field *block_load_status;
 188
 189         /* Special field in effect_operation */
 190         struct hid_field *effect_operation_status;
 191
 192         int control_id[sizeof(pidff_device_control)];
 193         int type_id[sizeof(pidff_effect_types)];
 194         int status_id[sizeof(pidff_block_load_status)];
 195         int operation_id[sizeof(pidff_effect_operation_status)];
 196
 197         int pid_id[PID_EFFECTS_MAX];
 198 };
 199
 200 /*
 201  * Scale an unsigned value with range 0..max for the given field
 202  */
 203 static int pidff_rescale(int i, int max, struct hid_field *field)
 204 {
 205         return i * (field->logical_maximum - field->logical_minimum) / max +
 206             field->logical_minimum;
 207 }
 208
 209 /*
 210  * Scale a signed value in range -0x8000..0x7fff for the given field
 211  */
 212 static int pidff_rescale_signed(int i, struct hid_field *field)
 213 {
 214         return i == 0 ? 0 : i >
 215             0 ? i * field->logical_maximum / 0x7fff : i *
 216             field->logical_minimum / -0x8000;
 217 }
 218
 219 static void pidff_set(struct pidff_usage *usage, u16 value)
 220 {
 221         usage->value[0] = pidff_rescale(value, 0xffff, usage->field);
 222         debug("calculated from %d to %d", value, usage->value[0]);
 223 }
 224
 225 static void pidff_set_signed(struct pidff_usage *usage, s16 value)
 226 {
 227         if (usage->field->logical_minimum < 0)
 228                 usage->value[0] = pidff_rescale_signed(value, usage->field);
 229         else {
 230                 if (value < 0)
 231                         usage->value[0] =
 232                             pidff_rescale(-value, 0x8000, usage->field);
 233                 else
 234                         usage->value[0] =
 235                             pidff_rescale(value, 0x7fff, usage->field);
 236         }
 237         debug("calculated from %d to %d", value, usage->value[0]);
 238 }
 239
 240 /*
 241  * Send envelope report to the device
 242  */
 243 static void pidff_set_envelope_report(struct pidff_device *pidff,
 244                                       struct ff_envelope *envelope)
 245 {
 246         pidff->set_envelope[PID_EFFECT_BLOCK_INDEX].value[0] =
 247             pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
 248
 249         pidff->set_envelope[PID_ATTACK_LEVEL].value[0] =
 250             pidff_rescale(envelope->attack_level >
 251                           0x7fff ? 0x7fff : envelope->attack_level, 0x7fff,
 252                           pidff->set_envelope[PID_ATTACK_LEVEL].field);
 253         pidff->set_envelope[PID_FADE_LEVEL].value[0] =
 254             pidff_rescale(envelope->fade_level >
 255                           0x7fff ? 0x7fff : envelope->fade_level, 0x7fff,
 256                           pidff->set_envelope[PID_FADE_LEVEL].field);
 257
 258         pidff->set_envelope[PID_ATTACK_TIME].value[0] = envelope->attack_length;
 259         pidff->set_envelope[PID_FADE_TIME].value[0] = envelope->fade_length;
 260
 261         debug("attack %u => %d", envelope->attack_level,
 262               pidff->set_envelope[PID_ATTACK_LEVEL].value[0]);
 263
 264         usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_ENVELOPE],
 265                           USB_DIR_OUT);
 266 }
 267
 268 /*
 269  * Test if the new envelope differs from old one
 270  */
 271 static int pidff_needs_set_envelope(struct ff_envelope *envelope,
 272                                     struct ff_envelope *old)
 273 {
 274         return envelope->attack_level != old->attack_level ||
 275                envelope->fade_level != old->fade_level ||
 276                envelope->attack_length != old->attack_length ||
 277                envelope->fade_length != old->fade_length;
 278 }
 279
 280 /*
 281  * Send constant force report to the device
 282  */
 283 static void pidff_set_constant_force_report(struct pidff_device *pidff,
 284                                             struct ff_effect *effect)
 285 {
 286         pidff->set_constant[PID_EFFECT_BLOCK_INDEX].value[0] =
 287                 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
 288         pidff_set_signed(&pidff->set_constant[PID_MAGNITUDE],
 289                          effect->u.constant.level);
 290
 291         usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_CONSTANT],
 292                           USB_DIR_OUT);
 293 }
 294
 295 /*
 296  * Test if the constant parameters have changed between effects
 297  */
 298 static int pidff_needs_set_constant(struct ff_effect *effect,
 299                                     struct ff_effect *old)
 300 {
 301         return effect->u.constant.level != old->u.constant.level;
 302 }
 303
 304 /*
 305  * Send set effect report to the device
 306  */
 307 static void pidff_set_effect_report(struct pidff_device *pidff,
 308                                     struct ff_effect *effect)
 309 {
 310         pidff->set_effect[PID_EFFECT_BLOCK_INDEX].value[0] =
 311                 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
 312         pidff->set_effect_type->value[0] =
 313                 pidff->create_new_effect_type->value[0];
 314         pidff->set_effect[PID_DURATION].value[0] = effect->replay.length;
 315         pidff->set_effect[PID_TRIGGER_BUTTON].value[0] = effect->trigger.button;
 316         pidff->set_effect[PID_TRIGGER_REPEAT_INT].value[0] =
 317                 effect->trigger.interval;
 318         pidff->set_effect[PID_GAIN].value[0] =
 319                 pidff->set_effect[PID_GAIN].field->logical_maximum;
 320         pidff->set_effect[PID_DIRECTION_ENABLE].value[0] = 1;
 321         pidff->effect_direction->value[0] =
 322                 pidff_rescale(effect->direction, 0xffff,
 323                                 pidff->effect_direction);
 324         pidff->set_effect[PID_START_DELAY].value[0] = effect->replay.delay;
 325
 326         usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_EFFECT],
 327                           USB_DIR_OUT);
 328 }
 329
 330 /*
 331  * Test if the values used in set_effect have changed
 332  */
 333 static int pidff_needs_set_effect(struct ff_effect *effect,
 334                                   struct ff_effect *old)
 335 {
 336         return effect->replay.length != old->replay.length ||
 337                effect->trigger.interval != old->trigger.interval ||
 338                effect->trigger.button != old->trigger.button ||
 339                effect->direction != old->direction ||
 340                effect->replay.delay != old->replay.delay;
 341 }
 342
 343 /*
 344  * Send periodic effect report to the device
 345  */
 346 static void pidff_set_periodic_report(struct pidff_device *pidff,
 347                                       struct ff_effect *effect)
 348 {
 349         pidff->set_periodic[PID_EFFECT_BLOCK_INDEX].value[0] =
 350                 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
 351         pidff_set_signed(&pidff->set_periodic[PID_MAGNITUDE],
 352                          effect->u.periodic.magnitude);
 353         pidff_set_signed(&pidff->set_periodic[PID_OFFSET],
 354                          effect->u.periodic.offset);
 355         pidff_set(&pidff->set_periodic[PID_PHASE], effect->u.periodic.phase);
 356         pidff->set_periodic[PID_PERIOD].value[0] = effect->u.periodic.period;
 357
 358         usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_PERIODIC],
 359                           USB_DIR_OUT);
 360
 361 }
 362
 363 /*
 364  * Test if periodic effect parameters have changed
 365  */
 366 static int pidff_needs_set_periodic(struct ff_effect *effect,
 367                                     struct ff_effect *old)
 368 {
 369         return effect->u.periodic.magnitude != old->u.periodic.magnitude ||
 370                effect->u.periodic.offset != old->u.periodic.offset ||
 371                effect->u.periodic.phase != old->u.periodic.phase ||
 372                effect->u.periodic.period != old->u.periodic.period;
 373 }
 374
 375 /*
 376  * Send condition effect reports to the device
 377  */
 378 static void pidff_set_condition_report(struct pidff_device *pidff,
 379                                        struct ff_effect *effect)
 380 {
 381         int i;
 382
 383         pidff->set_condition[PID_EFFECT_BLOCK_INDEX].value[0] =
 384                 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
 385
 386         for (i = 0; i < 2; i++) {
 387                 pidff->set_condition[PID_PARAM_BLOCK_OFFSET].value[0] = i;
 388                 pidff_set_signed(&pidff->set_condition[PID_CP_OFFSET],
 389                                  effect->u.condition[i].center);
 390                 pidff_set_signed(&pidff->set_condition[PID_POS_COEFFICIENT],
 391                                  effect->u.condition[i].right_coeff);
 392                 pidff_set_signed(&pidff->set_condition[PID_NEG_COEFFICIENT],
 393                                  effect->u.condition[i].left_coeff);
 394                 pidff_set(&pidff->set_condition[PID_POS_SATURATION],
 395                           effect->u.condition[i].right_saturation);
 396                 pidff_set(&pidff->set_condition[PID_NEG_SATURATION],
 397                           effect->u.condition[i].left_saturation);
 398                 pidff_set(&pidff->set_condition[PID_DEAD_BAND],
 399                           effect->u.condition[i].deadband);
 400                 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_CONDITION],
 401                                   USB_DIR_OUT);
 402         }
 403 }
 404
 405 /*
 406  * Test if condition effect parameters have changed
 407  */
 408 static int pidff_needs_set_condition(struct ff_effect *effect,
 409                                      struct ff_effect *old)
 410 {
 411         int i;
 412         int ret = 0;
 413
 414         for (i = 0; i < 2; i++) {
 415                 struct ff_condition_effect *cond = &effect->u.condition[i];
 416                 struct ff_condition_effect *old_cond = &old->u.condition[i];
 417
 418                 ret |= cond->center != old_cond->center ||
 419                        cond->right_coeff != old_cond->right_coeff ||
 420                        cond->left_coeff != old_cond->left_coeff ||
 421                        cond->right_saturation != old_cond->right_saturation ||
 422                        cond->left_saturation != old_cond->left_saturation ||
 423                        cond->deadband != old_cond->deadband;
 424         }
 425
 426         return ret;
 427 }
 428
 429 /*
 430  * Send ramp force report to the device
 431  */
 432 static void pidff_set_ramp_force_report(struct pidff_device *pidff,
 433                                         struct ff_effect *effect)
 434 {
 435         pidff->set_ramp[PID_EFFECT_BLOCK_INDEX].value[0] =
 436                 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
 437         pidff_set_signed(&pidff->set_ramp[PID_RAMP_START],
 438                          effect->u.ramp.start_level);
 439         pidff_set_signed(&pidff->set_ramp[PID_RAMP_END],
 440                          effect->u.ramp.end_level);
 441         usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_RAMP],
 442                           USB_DIR_OUT);
 443 }
 444
 445 /*
 446  * Test if ramp force parameters have changed
 447  */
 448 static int pidff_needs_set_ramp(struct ff_effect *effect, struct ff_effect *old)
 449 {
 450         return effect->u.ramp.start_level != old->u.ramp.start_level ||
 451                effect->u.ramp.end_level != old->u.ramp.end_level;
 452 }
 453
 454 /*
 455  * Send a request for effect upload to the device
 456  *
 457  * Returns 0 if device reported success, -ENOSPC if the device reported memory
 458  * is full. Upon unknown response the function will retry for 60 times, if
 459  * still unsuccessful -EIO is returned.
 460  */
 461 static int pidff_request_effect_upload(struct pidff_device *pidff, int efnum)
 462 {
 463         int j;
 464
 465         pidff->create_new_effect_type->value[0] = efnum;
 466         usbhid_submit_report(pidff->hid, pidff->reports[PID_CREATE_NEW_EFFECT],
 467                           USB_DIR_OUT);
 468         debug("create_new_effect sent, type: %d", efnum);
 469
 470         pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] = 0;
 471         pidff->block_load_status->value[0] = 0;
 472         usbhid_wait_io(pidff->hid);
 473
 474         for (j = 0; j < 60; j++) {
 475                 debug("pid_block_load requested");
 476                 usbhid_submit_report(pidff->hid, pidff->reports[PID_BLOCK_LOAD],
 477                                   USB_DIR_IN);
 478                 usbhid_wait_io(pidff->hid);
 479                 if (pidff->block_load_status->value[0] ==
 480                     pidff->status_id[PID_BLOCK_LOAD_SUCCESS]) {
 481                         debug("device reported free memory: %d bytes",
 482                               pidff->block_load[PID_RAM_POOL_AVAILABLE].value ?
 483                                 pidff->block_load[PID_RAM_POOL_AVAILABLE].value[0] : -1);
 484                         return 0;
 485                 }
 486                 if (pidff->block_load_status->value[0] ==
 487                     pidff->status_id[PID_BLOCK_LOAD_FULL]) {
 488                         debug("not enough memory free: %d bytes",
 489                               pidff->block_load[PID_RAM_POOL_AVAILABLE].value ?
 490                                 pidff->block_load[PID_RAM_POOL_AVAILABLE].value[0] : -1);
 491                         return -ENOSPC;
 492                 }
 493         }
 494         printk(KERN_ERR "hid-pidff: pid_block_load failed 60 times\n");
 495         return -EIO;
 496 }
 497
 498 /*
 499  * Play the effect with PID id n times
 500  */
 501 static void pidff_playback_pid(struct pidff_device *pidff, int pid_id, int n)
 502 {
 503         pidff->effect_operation[PID_EFFECT_BLOCK_INDEX].value[0] = pid_id;
 504
 505         if (n == 0) {
 506                 pidff->effect_operation_status->value[0] =
 507                         pidff->operation_id[PID_EFFECT_STOP];
 508         } else {
 509                 pidff->effect_operation_status->value[0] =
 510                         pidff->operation_id[PID_EFFECT_START];
 511                 pidff->effect_operation[PID_LOOP_COUNT].value[0] = n;
 512         }
 513
 514         usbhid_submit_report(pidff->hid, pidff->reports[PID_EFFECT_OPERATION],
 515                           USB_DIR_OUT);
 516 }
 517
 518 /**
 519  * Play the effect with effect id @effect_id for @value times
 520  */
 521 static int pidff_playback(struct input_dev *dev, int effect_id, int value)
 522 {
 523         struct pidff_device *pidff = dev->ff->private;
 524
 525         pidff_playback_pid(pidff, pidff->pid_id[effect_id], value);
 526
 527         return 0;
 528 }
 529
 530 /*
 531  * Erase effect with PID id
 532  */
 533 static void pidff_erase_pid(struct pidff_device *pidff, int pid_id)
 534 {
 535         pidff->block_free[PID_EFFECT_BLOCK_INDEX].value[0] = pid_id;
 536         usbhid_submit_report(pidff->hid, pidff->reports[PID_BLOCK_FREE],
 537                           USB_DIR_OUT);
 538 }
 539
 540 /*
 541  * Stop and erase effect with effect_id
 542  */
 543 static int pidff_erase_effect(struct input_dev *dev, int effect_id)
 544 {
 545         struct pidff_device *pidff = dev->ff->private;
 546         int pid_id = pidff->pid_id[effect_id];
 547
 548         debug("starting to erase %d/%d", effect_id, pidff->pid_id[effect_id]);
 549         /* Wait for the queue to clear. We do not want a full fifo to
 550            prevent the effect removal. */
 551         usbhid_wait_io(pidff->hid);
 552         pidff_playback_pid(pidff, pid_id, 0);
 553         pidff_erase_pid(pidff, pid_id);
 554
 555         return 0;
 556 }
 557
 558 /*
 559  * Effect upload handler
 560  */
 561 static int pidff_upload_effect(struct input_dev *dev, struct ff_effect *effect,
 562                                struct ff_effect *old)
 563 {
 564         struct pidff_device *pidff = dev->ff->private;
 565         int type_id;
 566         int error;
 567
 568         switch (effect->type) {
 569         case FF_CONSTANT:
 570                 if (!old) {
 571                         error = pidff_request_effect_upload(pidff,
 572                                         pidff->type_id[PID_CONSTANT]);
 573                         if (error)
 574                                 return error;
 575                 }
 576                 if (!old || pidff_needs_set_effect(effect, old))
 577                         pidff_set_effect_report(pidff, effect);
 578                 if (!old || pidff_needs_set_constant(effect, old))
 579                         pidff_set_constant_force_report(pidff, effect);
 580                 if (!old ||
 581                     pidff_needs_set_envelope(&effect->u.constant.envelope,
 582                                         &old->u.constant.envelope))
 583                         pidff_set_envelope_report(pidff,
 584                                         &effect->u.constant.envelope);
 585                 break;
 586
 587         case FF_PERIODIC:
 588                 if (!old) {
 589                         switch (effect->u.periodic.waveform) {
 590                         case FF_SQUARE:
 591                                 type_id = PID_SQUARE;
 592                                 break;
 593                         case FF_TRIANGLE:
 594                                 type_id = PID_TRIANGLE;
 595                                 break;
 596                         case FF_SINE:
 597                                 type_id = PID_SINE;
 598                                 break;
 599                         case FF_SAW_UP:
 600                                 type_id = PID_SAW_UP;
 601                                 break;
 602                         case FF_SAW_DOWN:
 603                                 type_id = PID_SAW_DOWN;
 604                                 break;
 605                         default:
 606                                 printk(KERN_ERR
 607                                        "hid-pidff: invalid waveform\n");
 608                                 return -EINVAL;
 609                         }
 610
 611                         error = pidff_request_effect_upload(pidff,
 612                                         pidff->type_id[type_id]);
 613                         if (error)
 614                                 return error;
 615                 }
 616                 if (!old || pidff_needs_set_effect(effect, old))
 617                         pidff_set_effect_report(pidff, effect);
 618                 if (!old || pidff_needs_set_periodic(effect, old))
 619                         pidff_set_periodic_report(pidff, effect);
 620                 if (!old ||
 621                     pidff_needs_set_envelope(&effect->u.periodic.envelope,
 622                                         &old->u.periodic.envelope))
 623                         pidff_set_envelope_report(pidff,
 624                                         &effect->u.periodic.envelope);
 625                 break;
 626
 627         case FF_RAMP:
 628                 if (!old) {
 629                         error = pidff_request_effect_upload(pidff,
 630                                         pidff->type_id[PID_RAMP]);
 631                         if (error)
 632                                 return error;
 633                 }
 634                 if (!old || pidff_needs_set_effect(effect, old))
 635                         pidff_set_effect_report(pidff, effect);
 636                 if (!old || pidff_needs_set_ramp(effect, old))
 637                         pidff_set_ramp_force_report(pidff, effect);
 638                 if (!old ||
 639                     pidff_needs_set_envelope(&effect->u.ramp.envelope,
 640                                         &old->u.ramp.envelope))
 641                         pidff_set_envelope_report(pidff,
 642                                         &effect->u.ramp.envelope);
 643                 break;
 644
 645         case FF_SPRING:
 646                 if (!old) {
 647                         error = pidff_request_effect_upload(pidff,
 648                                         pidff->type_id[PID_SPRING]);
 649                         if (error)
 650                                 return error;
 651                 }
 652                 if (!old || pidff_needs_set_effect(effect, old))
 653                         pidff_set_effect_report(pidff, effect);
 654                 if (!old || pidff_needs_set_condition(effect, old))
 655                         pidff_set_condition_report(pidff, effect);
 656                 break;
 657
 658         case FF_FRICTION:
 659                 if (!old) {
 660                         error = pidff_request_effect_upload(pidff,
 661                                         pidff->type_id[PID_FRICTION]);
 662                         if (error)
 663                                 return error;
 664                 }
 665                 if (!old || pidff_needs_set_effect(effect, old))
 666                         pidff_set_effect_report(pidff, effect);
 667                 if (!old || pidff_needs_set_condition(effect, old))
 668                         pidff_set_condition_report(pidff, effect);
 669                 break;
 670
 671         case FF_DAMPER:
 672                 if (!old) {
 673                         error = pidff_request_effect_upload(pidff,
 674                                         pidff->type_id[PID_DAMPER]);
 675                         if (error)
 676                                 return error;
 677                 }
 678                 if (!old || pidff_needs_set_effect(effect, old))
 679                         pidff_set_effect_report(pidff, effect);
 680                 if (!old || pidff_needs_set_condition(effect, old))
 681                         pidff_set_condition_report(pidff, effect);
 682                 break;
 683
 684         case FF_INERTIA:
 685                 if (!old) {
 686                         error = pidff_request_effect_upload(pidff,
 687                                         pidff->type_id[PID_INERTIA]);
 688                         if (error)
 689                                 return error;
 690                 }
 691                 if (!old || pidff_needs_set_effect(effect, old))
 692                         pidff_set_effect_report(pidff, effect);
 693                 if (!old || pidff_needs_set_condition(effect, old))
 694                         pidff_set_condition_report(pidff, effect);
 695                 break;
 696
 697         default:
 698                 printk(KERN_ERR "hid-pidff: invalid type\n");
 699                 return -EINVAL;
 700         }
 701
 702         if (!old)
 703                 pidff->pid_id[effect->id] =
 704                     pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
 705
 706         debug("uploaded");
 707
 708         return 0;
 709 }
 710
 711 /*
 712  * set_gain() handler
 713  */
 714 static void pidff_set_gain(struct input_dev *dev, u16 gain)
 715 {
 716         struct pidff_device *pidff = dev->ff->private;
 717
 718         pidff_set(&pidff->device_gain[PID_DEVICE_GAIN_FIELD], gain);
 719         usbhid_submit_report(pidff->hid, pidff->reports[PID_DEVICE_GAIN],
 720                           USB_DIR_OUT);
 721 }
 722
 723 static void pidff_autocenter(struct pidff_device *pidff, u16 magnitude)
 724 {
 725         struct hid_field *field =
 726                 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field;
 727
 728         if (!magnitude) {
 729                 pidff_playback_pid(pidff, field->logical_minimum, 0);
 730                 return;
 731         }
 732
 733         pidff_playback_pid(pidff, field->logical_minimum, 1);
 734
 735         pidff->set_effect[PID_EFFECT_BLOCK_INDEX].value[0] =
 736                 pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum;
 737         pidff->set_effect_type->value[0] = pidff->type_id[PID_SPRING];
 738         pidff->set_effect[PID_DURATION].value[0] = 0;
 739         pidff->set_effect[PID_TRIGGER_BUTTON].value[0] = 0;
 740         pidff->set_effect[PID_TRIGGER_REPEAT_INT].value[0] = 0;
 741         pidff_set(&pidff->set_effect[PID_GAIN], magnitude);
 742         pidff->set_effect[PID_DIRECTION_ENABLE].value[0] = 1;
 743         pidff->set_effect[PID_START_DELAY].value[0] = 0;
 744
 745         usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_EFFECT],
 746                           USB_DIR_OUT);
 747 }
 748
 749 /*
 750  * pidff_set_autocenter() handler
 751  */
 752 static void pidff_set_autocenter(struct input_dev *dev, u16 magnitude)
 753 {
 754         struct pidff_device *pidff = dev->ff->private;
 755
 756         pidff_autocenter(pidff, magnitude);
 757 }
 758
 759 /*
 760  * Find fields from a report and fill a pidff_usage
 761  */
 762 static int pidff_find_fields(struct pidff_usage *usage, const u8 *table,
 763                              struct hid_report *report, int count, int strict)
 764 {
 765         int i, j, k, found;
 766
 767         for (k = 0; k < count; k++) {
 768                 found = 0;
 769                 for (i = 0; i < report->maxfield; i++) {
 770                         if (report->field[i]->maxusage !=
 771                             report->field[i]->report_count) {
 772                                 debug("maxusage and report_count do not match, "
 773                                       "skipping");
 774                                 continue;
 775                         }
 776                         for (j = 0; j < report->field[i]->maxusage; j++) {
 777                                 if (report->field[i]->usage[j].hid ==
 778                                     (HID_UP_PID | table[k])) {
 779                                         debug("found %d at %d->%d", k, i, j);
 780                                         usage[k].field = report->field[i];
 781                                         usage[k].value =
 782                                                 &report->field[i]->value[j];
 783                                         found = 1;
 784                                         break;
 785                                 }
 786                         }
 787                         if (found)
 788                                 break;
 789                 }
 790                 if (!found && strict) {
 791                         debug("failed to locate %d", k);
 792                         return -1;
 793                 }
 794         }
 795         return 0;
 796 }
 797
 798 /*
 799  * Return index into pidff_reports for the given usage
 800  */
 801 static int pidff_check_usage(int usage)
 802 {
 803         int i;
 804
 805         for (i = 0; i < sizeof(pidff_reports); i++)
 806                 if (usage == (HID_UP_PID | pidff_reports[i]))
 807                         return i;
 808
 809         return -1;
 810 }
 811
 812 /*
 813  * Find the reports and fill pidff->reports[]
 814  * report_type specifies either OUTPUT or FEATURE reports
 815  */
 816 static void pidff_find_reports(struct hid_device *hid, int report_type,
 817                                struct pidff_device *pidff)
 818 {
 819         struct hid_report *report;
 820         int i, ret;
 821
 822         list_for_each_entry(report,
 823                             &hid->report_enum[report_type].report_list, list) {
 824                 if (report->maxfield < 1)
 825                         continue;
 826                 ret = pidff_check_usage(report->field[0]->logical);
 827                 if (ret != -1) {
 828                         debug("found usage 0x%02x from field->logical",
 829                               pidff_reports[ret]);
 830                         pidff->reports[ret] = report;
 831                         continue;
 832                 }
 833
 834                 /*
 835                  * Sometimes logical collections are stacked to indicate
 836                  * different usages for the report and the field, in which
 837                  * case we want the usage of the parent. However, Linux HID
 838                  * implementation hides this fact, so we have to dig it up
 839                  * ourselves
 840                  */
 841                 i = report->field[0]->usage[0].collection_index;
 842                 if (i <= 0 ||
 843                     hid->collection[i - 1].type != HID_COLLECTION_LOGICAL)
 844                         continue;
 845                 ret = pidff_check_usage(hid->collection[i - 1].usage);
 846                 if (ret != -1 && !pidff->reports[ret]) {
 847                         debug("found usage 0x%02x from collection array",
 848                               pidff_reports[ret]);
 849                         pidff->reports[ret] = report;
 850                 }
 851         }
 852 }
 853
 854 /*
 855  * Test if the required reports have been found
 856  */
 857 static int pidff_reports_ok(struct pidff_device *pidff)
 858 {
 859         int i;
 860
 861         for (i = 0; i <= PID_REQUIRED_REPORTS; i++) {
 862                 if (!pidff->reports[i]) {
 863                         debug("%d missing", i);
 864                         return 0;
 865                 }
 866         }
 867
 868         return 1;
 869 }
 870
 871 /*
 872  * Find a field with a specific usage within a report
 873  */
 874 static struct hid_field *pidff_find_special_field(struct hid_report *report,
 875                                                   int usage, int enforce_min)
 876 {
 877         int i;
 878
 879         for (i = 0; i < report->maxfield; i++) {
 880                 if (report->field[i]->logical == (HID_UP_PID | usage) &&
 881                     report->field[i]->report_count > 0) {
 882                         if (!enforce_min ||
 883                             report->field[i]->logical_minimum == 1)
 884                                 return report->field[i];
 885                         else {
 886                                 printk(KERN_ERR "hid-pidff: logical_minimum "
 887                                         "is not 1 as it should be\n");
 888                                 return NULL;
 889                         }
 890                 }
 891         }
 892         return NULL;
 893 }
 894
 895 /*
 896  * Fill a pidff->*_id struct table
 897  */
 898 static int pidff_find_special_keys(int *keys, struct hid_field *fld,
 899                                    const u8 *usagetable, int count)
 900 {
 901
 902         int i, j;
 903         int found = 0;
 904
 905         for (i = 0; i < count; i++) {
 906                 for (j = 0; j < fld->maxusage; j++) {
 907                         if (fld->usage[j].hid == (HID_UP_PID | usagetable[i])) {
 908                                 keys[i] = j + 1;
 909                                 found++;
 910                                 break;
 911                         }
 912                 }
 913         }
 914         return found;
 915 }
 916
 917 #define PIDFF_FIND_SPECIAL_KEYS(keys, field, name) \
 918         pidff_find_special_keys(pidff->keys, pidff->field, pidff_ ## name, \
 919                 sizeof(pidff_ ## name))
 920
 921 /*
 922  * Find and check the special fields
 923  */
 924 static int pidff_find_special_fields(struct pidff_device *pidff)
 925 {
 926         debug("finding special fields");
 927
 928         pidff->create_new_effect_type =
 929                 pidff_find_special_field(pidff->reports[PID_CREATE_NEW_EFFECT],
 930                                          0x25, 1);
 931         pidff->set_effect_type =
 932                 pidff_find_special_field(pidff->reports[PID_SET_EFFECT],
 933                                          0x25, 1);
 934         pidff->effect_direction =
 935                 pidff_find_special_field(pidff->reports[PID_SET_EFFECT],
 936                                          0x57, 0);
 937         pidff->device_control =
 938                 pidff_find_special_field(pidff->reports[PID_DEVICE_CONTROL],
 939                                          0x96, 1);
 940         pidff->block_load_status =
 941                 pidff_find_special_field(pidff->reports[PID_BLOCK_LOAD],
 942                                          0x8b, 1);
 943         pidff->effect_operation_status =
 944                 pidff_find_special_field(pidff->reports[PID_EFFECT_OPERATION],
 945                                          0x78, 1);
 946
 947         debug("search done");
 948
 949         if (!pidff->create_new_effect_type || !pidff->set_effect_type) {
 950                 printk(KERN_ERR "hid-pidff: effect lists not found\n");
 951                 return -1;
 952         }
 953
 954         if (!pidff->effect_direction) {
 955                 printk(KERN_ERR "hid-pidff: direction field not found\n");
 956                 return -1;
 957         }
 958
 959         if (!pidff->device_control) {
 960                 printk(KERN_ERR "hid-pidff: device control field not found\n");
 961                 return -1;
 962         }
 963
 964         if (!pidff->block_load_status) {
 965                 printk(KERN_ERR
 966                        "hid-pidff: block load status field not found\n");
 967                 return -1;
 968         }
 969
 970         if (!pidff->effect_operation_status) {
 971                 printk(KERN_ERR
 972                        "hid-pidff: 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                 printk(KERN_ERR "hid-pidff: 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                 printk(KERN_ERR
 992                        "hidpidff: 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                 printk(KERN_ERR
1000                        "hidpidff: effect operation identifiers not found\n");
1001                 return -1;
1002         }
1003
1004         return 0;
1005 }
1006
1007 /**
1008  * Find the implemented effect types
1009  */
1010 static int pidff_find_effects(struct pidff_device *pidff,
1011                               struct input_dev *dev)
1012 {
1013         int i;
1014
1015         for (i = 0; i < sizeof(pidff_effect_types); i++) {
1016                 int pidff_type = pidff->type_id[i];
1017                 if (pidff->set_effect_type->usage[pidff_type].hid !=
1018                     pidff->create_new_effect_type->usage[pidff_type].hid) {
1019                         printk(KERN_ERR "hid-pidff: "
1020                                "effect type number %d is invalid\n", i);
1021                         return -1;
1022                 }
1023         }
1024
1025         if (pidff->type_id[PID_CONSTANT])
1026                 set_bit(FF_CONSTANT, dev->ffbit);
1027         if (pidff->type_id[PID_RAMP])
1028                 set_bit(FF_RAMP, dev->ffbit);
1029         if (pidff->type_id[PID_SQUARE]) {
1030                 set_bit(FF_SQUARE, dev->ffbit);
1031                 set_bit(FF_PERIODIC, dev->ffbit);
1032         }
1033         if (pidff->type_id[PID_SINE]) {
1034                 set_bit(FF_SINE, dev->ffbit);
1035                 set_bit(FF_PERIODIC, dev->ffbit);
1036         }
1037         if (pidff->type_id[PID_TRIANGLE]) {
1038                 set_bit(FF_TRIANGLE, dev->ffbit);
1039                 set_bit(FF_PERIODIC, dev->ffbit);
1040         }
1041         if (pidff->type_id[PID_SAW_UP]) {
1042                 set_bit(FF_SAW_UP, dev->ffbit);
1043                 set_bit(FF_PERIODIC, dev->ffbit);
1044         }
1045         if (pidff->type_id[PID_SAW_DOWN]) {
1046                 set_bit(FF_SAW_DOWN, dev->ffbit);
1047                 set_bit(FF_PERIODIC, dev->ffbit);
1048         }
1049         if (pidff->type_id[PID_SPRING])
1050                 set_bit(FF_SPRING, dev->ffbit);
1051         if (pidff->type_id[PID_DAMPER])
1052                 set_bit(FF_DAMPER, dev->ffbit);
1053         if (pidff->type_id[PID_INERTIA])
1054                 set_bit(FF_INERTIA, dev->ffbit);
1055         if (pidff->type_id[PID_FRICTION])
1056                 set_bit(FF_FRICTION, dev->ffbit);
1057
1058         return 0;
1059
1060 }
1061
1062 #define PIDFF_FIND_FIELDS(name, report, strict) \
1063         pidff_find_fields(pidff->name, pidff_ ## name, \
1064                 pidff->reports[report], \
1065                 sizeof(pidff_ ## name), strict)
1066
1067 /*
1068  * Fill and check the pidff_usages
1069  */
1070 static int pidff_init_fields(struct pidff_device *pidff, struct input_dev *dev)
1071 {
1072         int envelope_ok = 0;
1073
1074         if (PIDFF_FIND_FIELDS(set_effect, PID_SET_EFFECT, 1)) {
1075                 printk(KERN_ERR
1076                        "hid-pidff: unknown set_effect report layout\n");
1077                 return -ENODEV;
1078         }
1079
1080         PIDFF_FIND_FIELDS(block_load, PID_BLOCK_LOAD, 0);
1081         if (!pidff->block_load[PID_EFFECT_BLOCK_INDEX].value) {
1082                 printk(KERN_ERR
1083                        "hid-pidff: unknown pid_block_load report layout\n");
1084                 return -ENODEV;
1085         }
1086
1087         if (PIDFF_FIND_FIELDS(effect_operation, PID_EFFECT_OPERATION, 1)) {
1088                 printk(KERN_ERR
1089                        "hid-pidff: unknown effect_operation report layout\n");
1090                 return -ENODEV;
1091         }
1092
1093         if (PIDFF_FIND_FIELDS(block_free, PID_BLOCK_FREE, 1)) {
1094                 printk(KERN_ERR
1095                        "hid-pidff: unknown pid_block_free report layout\n");
1096                 return -ENODEV;
1097         }
1098
1099         if (!PIDFF_FIND_FIELDS(set_envelope, PID_SET_ENVELOPE, 1))
1100                 envelope_ok = 1;
1101
1102         if (pidff_find_special_fields(pidff) || pidff_find_effects(pidff, dev))
1103                 return -ENODEV;
1104
1105         if (!envelope_ok) {
1106                 if (test_and_clear_bit(FF_CONSTANT, dev->ffbit))
1107                         printk(KERN_WARNING "hid-pidff: "
1108                                "has constant effect but no envelope\n");
1109                 if (test_and_clear_bit(FF_RAMP, dev->ffbit))
1110                         printk(KERN_WARNING "hid-pidff: "
1111                                 "has ramp effect but no envelope\n");
1112
1113                 if (test_and_clear_bit(FF_PERIODIC, dev->ffbit))
1114                         printk(KERN_WARNING "hid-pidff: "
1115                                 "has periodic effect but no envelope\n");
1116         }
1117
1118         if (test_bit(FF_CONSTANT, dev->ffbit) &&
1119             PIDFF_FIND_FIELDS(set_constant, PID_SET_CONSTANT, 1)) {
1120                 printk(KERN_WARNING
1121                        "hid-pidff: unknown constant effect layout\n");
1122                 clear_bit(FF_CONSTANT, dev->ffbit);
1123         }
1124
1125         if (test_bit(FF_RAMP, dev->ffbit) &&
1126             PIDFF_FIND_FIELDS(set_ramp, PID_SET_RAMP, 1)) {
1127                 printk(KERN_WARNING "hid-pidff: unknown ramp effect layout\n");
1128                 clear_bit(FF_RAMP, dev->ffbit);
1129         }
1130
1131         if ((test_bit(FF_SPRING, dev->ffbit) ||
1132              test_bit(FF_DAMPER, dev->ffbit) ||
1133              test_bit(FF_FRICTION, dev->ffbit) ||
1134              test_bit(FF_INERTIA, dev->ffbit)) &&
1135             PIDFF_FIND_FIELDS(set_condition, PID_SET_CONDITION, 1)) {
1136                 printk(KERN_WARNING
1137                        "hid-pidff: unknown condition effect layout\n");
1138                 clear_bit(FF_SPRING, dev->ffbit);
1139                 clear_bit(FF_DAMPER, dev->ffbit);
1140                 clear_bit(FF_FRICTION, dev->ffbit);
1141                 clear_bit(FF_INERTIA, dev->ffbit);
1142         }
1143
1144         if (test_bit(FF_PERIODIC, dev->ffbit) &&
1145             PIDFF_FIND_FIELDS(set_periodic, PID_SET_PERIODIC, 1)) {
1146                 printk(KERN_WARNING
1147                        "hid-pidff: unknown periodic effect layout\n");
1148                 clear_bit(FF_PERIODIC, dev->ffbit);
1149         }
1150
1151         PIDFF_FIND_FIELDS(pool, PID_POOL, 0);
1152
1153         if (!PIDFF_FIND_FIELDS(device_gain, PID_DEVICE_GAIN, 1))
1154                 set_bit(FF_GAIN, dev->ffbit);
1155
1156         return 0;
1157 }
1158
1159 /*
1160  * Reset the device
1161  */
1162 static void pidff_reset(struct pidff_device *pidff)
1163 {
1164         struct hid_device *hid = pidff->hid;
1165         int i = 0;
1166
1167         pidff->device_control->value[0] = pidff->control_id[PID_RESET];
1168         /* We reset twice as sometimes hid_wait_io isn't waiting long enough */
1169         usbhid_submit_report(hid, pidff->reports[PID_DEVICE_CONTROL], USB_DIR_OUT);
1170         usbhid_wait_io(hid);
1171         usbhid_submit_report(hid, pidff->reports[PID_DEVICE_CONTROL], USB_DIR_OUT);
1172         usbhid_wait_io(hid);
1173
1174         pidff->device_control->value[0] =
1175                 pidff->control_id[PID_ENABLE_ACTUATORS];
1176         usbhid_submit_report(hid, pidff->reports[PID_DEVICE_CONTROL], USB_DIR_OUT);
1177         usbhid_wait_io(hid);
1178
1179         /* pool report is sometimes messed up, refetch it */
1180         usbhid_submit_report(hid, pidff->reports[PID_POOL], USB_DIR_IN);
1181         usbhid_wait_io(hid);
1182
1183         if (pidff->pool[PID_SIMULTANEOUS_MAX].value) {
1184                 int sim_effects = pidff->pool[PID_SIMULTANEOUS_MAX].value[0];
1185                 while (sim_effects < 2) {
1186                         if (i++ > 20) {
1187                                 printk(KERN_WARNING "hid-pidff: device reports "
1188                                        "%d simultaneous effects\n",
1189                                        sim_effects);
1190                                 break;
1191                         }
1192                         debug("pid_pool requested again");
1193                         usbhid_submit_report(hid, pidff->reports[PID_POOL],
1194                                           USB_DIR_IN);
1195                         usbhid_wait_io(hid);
1196                 }
1197         }
1198 }
1199
1200 /*
1201  * Test if autocenter modification is using the supported method
1202  */
1203 static int pidff_check_autocenter(struct pidff_device *pidff,
1204                                   struct input_dev *dev)
1205 {
1206         int error;
1207
1208         /*
1209          * Let's find out if autocenter modification is supported
1210          * Specification doesn't specify anything, so we request an
1211          * effect upload and cancel it immediately. If the approved
1212          * effect id was one above the minimum, then we assume the first
1213          * effect id is a built-in spring type effect used for autocenter
1214          */
1215
1216         error = pidff_request_effect_upload(pidff, 1);
1217         if (error) {
1218                 printk(KERN_ERR "hid-pidff: upload request failed\n");
1219                 return error;
1220         }
1221
1222         if (pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] ==
1223             pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum + 1) {
1224                 pidff_autocenter(pidff, 0xffff);
1225                 set_bit(FF_AUTOCENTER, dev->ffbit);
1226         } else {
1227                 printk(KERN_NOTICE "hid-pidff: "
1228                        "device has unknown autocenter control method\n");
1229         }
1230
1231         pidff_erase_pid(pidff,
1232                         pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0]);
1233
1234         return 0;
1235
1236 }
1237
1238 /*
1239  * Check if the device is PID and initialize it
1240  */
1241 int hid_pidff_init(struct hid_device *hid)
1242 {
1243         struct pidff_device *pidff;
1244         struct hid_input *hidinput = list_entry(hid->inputs.next,
1245                                                 struct hid_input, list);
1246         struct input_dev *dev = hidinput->input;
1247         struct ff_device *ff;
1248         int max_effects;
1249         int error;
1250
1251         debug("starting pid init");
1252
1253         if (list_empty(&hid->report_enum[HID_OUTPUT_REPORT].report_list)) {
1254                 debug("not a PID device, no output report");
1255                 return -ENODEV;
1256         }
1257
1258         pidff = kzalloc(sizeof(*pidff), GFP_KERNEL);
1259         if (!pidff)
1260                 return -ENOMEM;
1261
1262         pidff->hid = hid;
1263
1264         pidff_find_reports(hid, HID_OUTPUT_REPORT, pidff);
1265         pidff_find_reports(hid, HID_FEATURE_REPORT, pidff);
1266
1267         if (!pidff_reports_ok(pidff)) {
1268                 debug("reports not ok, aborting");
1269                 error = -ENODEV;
1270                 goto fail;
1271         }
1272
1273         error = pidff_init_fields(pidff, dev);
1274         if (error)
1275                 goto fail;
1276
1277         pidff_reset(pidff);
1278
1279         if (test_bit(FF_GAIN, dev->ffbit)) {
1280                 pidff_set(&pidff->device_gain[PID_DEVICE_GAIN_FIELD], 0xffff);
1281                 usbhid_submit_report(pidff->hid, pidff->reports[PID_DEVICE_GAIN],
1282                                   USB_DIR_OUT);
1283         }
1284
1285         error = pidff_check_autocenter(pidff, dev);
1286         if (error)
1287                 goto fail;
1288
1289         max_effects =
1290             pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_maximum -
1291             pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum +
1292             1;
1293         debug("max effects is %d", max_effects);
1294
1295         if (max_effects > PID_EFFECTS_MAX)
1296                 max_effects = PID_EFFECTS_MAX;
1297
1298         if (pidff->pool[PID_SIMULTANEOUS_MAX].value)
1299                 debug("max simultaneous effects is %d",
1300                       pidff->pool[PID_SIMULTANEOUS_MAX].value[0]);
1301
1302         if (pidff->pool[PID_RAM_POOL_SIZE].value)
1303                 debug("device memory size is %d bytes",
1304                       pidff->pool[PID_RAM_POOL_SIZE].value[0]);
1305
1306         if (pidff->pool[PID_DEVICE_MANAGED_POOL].value &&
1307             pidff->pool[PID_DEVICE_MANAGED_POOL].value[0] == 0) {
1308                 printk(KERN_NOTICE "hid-pidff: "
1309                        "device does not support device managed pool\n");
1310                 goto fail;
1311         }
1312
1313         error = input_ff_create(dev, max_effects);
1314         if (error)
1315                 goto fail;
1316
1317         ff = dev->ff;
1318         ff->private = pidff;
1319         ff->upload = pidff_upload_effect;
1320         ff->erase = pidff_erase_effect;
1321         ff->set_gain = pidff_set_gain;
1322         ff->set_autocenter = pidff_set_autocenter;
1323         ff->playback = pidff_playback;
1324
1325         printk(KERN_INFO "Force feedback for USB HID PID devices by "
1326                "Anssi Hannula <anssi.hannula@gmail.com>\n");
1327
1328         return 0;
1329
1330  fail:
1331         kfree(pidff);
1332         return error;
1333 }