git.oblomov.eu Git - linux-2.6/blob - drivers/usb/input/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/sched.h>
  28 #include <linux/input.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         debug("calculated from %d to %d", 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         debug("calculated from %d to %d", 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         debug("attack %u => %d", envelope->attack_level,
 263               pidff->set_envelope[PID_ATTACK_LEVEL].value[0]);
 264
 265         usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_ENVELOPE],
 266                           USB_DIR_OUT);
 267 }
 268
 269 /*
 270  * Test if the new envelope differs from old one
 271  */
 272 static int pidff_needs_set_envelope(struct ff_envelope *envelope,
 273                                     struct ff_envelope *old)
 274 {
 275         return envelope->attack_level != old->attack_level ||
 276                envelope->fade_level != old->fade_level ||
 277                envelope->attack_length != old->attack_length ||
 278                envelope->fade_length != old->fade_length;
 279 }
 280
 281 /*
 282  * Send constant force report to the device
 283  */
 284 static void pidff_set_constant_force_report(struct pidff_device *pidff,
 285                                             struct ff_effect *effect)
 286 {
 287         pidff->set_constant[PID_EFFECT_BLOCK_INDEX].value[0] =
 288                 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
 289         pidff_set_signed(&pidff->set_constant[PID_MAGNITUDE],
 290                          effect->u.constant.level);
 291
 292         usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_CONSTANT],
 293                           USB_DIR_OUT);
 294 }
 295
 296 /*
 297  * Test if the constant parameters have changed between effects
 298  */
 299 static int pidff_needs_set_constant(struct ff_effect *effect,
 300                                     struct ff_effect *old)
 301 {
 302         return effect->u.constant.level != old->u.constant.level;
 303 }
 304
 305 /*
 306  * Send set effect report to the device
 307  */
 308 static void pidff_set_effect_report(struct pidff_device *pidff,
 309                                     struct ff_effect *effect)
 310 {
 311         pidff->set_effect[PID_EFFECT_BLOCK_INDEX].value[0] =
 312                 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
 313         pidff->set_effect_type->value[0] =
 314                 pidff->create_new_effect_type->value[0];
 315         pidff->set_effect[PID_DURATION].value[0] = effect->replay.length;
 316         pidff->set_effect[PID_TRIGGER_BUTTON].value[0] = effect->trigger.button;
 317         pidff->set_effect[PID_TRIGGER_REPEAT_INT].value[0] =
 318                 effect->trigger.interval;
 319         pidff->set_effect[PID_GAIN].value[0] =
 320                 pidff->set_effect[PID_GAIN].field->logical_maximum;
 321         pidff->set_effect[PID_DIRECTION_ENABLE].value[0] = 1;
 322         pidff->effect_direction->value[0] =
 323                 pidff_rescale(effect->direction, 0xffff,
 324                                 pidff->effect_direction);
 325         pidff->set_effect[PID_START_DELAY].value[0] = effect->replay.delay;
 326
 327         usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_EFFECT],
 328                           USB_DIR_OUT);
 329 }
 330
 331 /*
 332  * Test if the values used in set_effect have changed
 333  */
 334 static int pidff_needs_set_effect(struct ff_effect *effect,
 335                                   struct ff_effect *old)
 336 {
 337         return effect->replay.length != old->replay.length ||
 338                effect->trigger.interval != old->trigger.interval ||
 339                effect->trigger.button != old->trigger.button ||
 340                effect->direction != old->direction ||
 341                effect->replay.delay != old->replay.delay;
 342 }
 343
 344 /*
 345  * Send periodic effect report to the device
 346  */
 347 static void pidff_set_periodic_report(struct pidff_device *pidff,
 348                                       struct ff_effect *effect)
 349 {
 350         pidff->set_periodic[PID_EFFECT_BLOCK_INDEX].value[0] =
 351                 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
 352         pidff_set_signed(&pidff->set_periodic[PID_MAGNITUDE],
 353                          effect->u.periodic.magnitude);
 354         pidff_set_signed(&pidff->set_periodic[PID_OFFSET],
 355                          effect->u.periodic.offset);
 356         pidff_set(&pidff->set_periodic[PID_PHASE], effect->u.periodic.phase);
 357         pidff->set_periodic[PID_PERIOD].value[0] = effect->u.periodic.period;
 358
 359         usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_PERIODIC],
 360                           USB_DIR_OUT);
 361
 362 }
 363
 364 /*
 365  * Test if periodic effect parameters have changed
 366  */
 367 static int pidff_needs_set_periodic(struct ff_effect *effect,
 368                                     struct ff_effect *old)
 369 {
 370         return effect->u.periodic.magnitude != old->u.periodic.magnitude ||
 371                effect->u.periodic.offset != old->u.periodic.offset ||
 372                effect->u.periodic.phase != old->u.periodic.phase ||
 373                effect->u.periodic.period != old->u.periodic.period;
 374 }
 375
 376 /*
 377  * Send condition effect reports to the device
 378  */
 379 static void pidff_set_condition_report(struct pidff_device *pidff,
 380                                        struct ff_effect *effect)
 381 {
 382         int i;
 383
 384         pidff->set_condition[PID_EFFECT_BLOCK_INDEX].value[0] =
 385                 pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
 386
 387         for (i = 0; i < 2; i++) {
 388                 pidff->set_condition[PID_PARAM_BLOCK_OFFSET].value[0] = i;
 389                 pidff_set_signed(&pidff->set_condition[PID_CP_OFFSET],
 390                                  effect->u.condition[i].center);
 391                 pidff_set_signed(&pidff->set_condition[PID_POS_COEFFICIENT],
 392                                  effect->u.condition[i].right_coeff);
 393                 pidff_set_signed(&pidff->set_condition[PID_NEG_COEFFICIENT],
 394                                  effect->u.condition[i].left_coeff);
 395                 pidff_set(&pidff->set_condition[PID_POS_SATURATION],
 396                           effect->u.condition[i].right_saturation);
 397                 pidff_set(&pidff->set_condition[PID_NEG_SATURATION],
 398                           effect->u.condition[i].left_saturation);
 399                 pidff_set(&pidff->set_condition[PID_DEAD_BAND],
 400                           effect->u.condition[i].deadband);
 401                 usbhid_wait_io(pidff->hid);
 402                 usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_CONDITION],
 403                                   USB_DIR_OUT);
 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         usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_RAMP],
 444                           USB_DIR_OUT);
 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         usbhid_submit_report(pidff->hid, pidff->reports[PID_CREATE_NEW_EFFECT],
 469                           USB_DIR_OUT);
 470         debug("create_new_effect sent, type: %d", efnum);
 471
 472         pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] = 0;
 473         pidff->block_load_status->value[0] = 0;
 474         usbhid_wait_io(pidff->hid);
 475
 476         for (j = 0; j < 60; j++) {
 477                 debug("pid_block_load requested");
 478                 usbhid_submit_report(pidff->hid, pidff->reports[PID_BLOCK_LOAD],
 479                                   USB_DIR_IN);
 480                 usbhid_wait_io(pidff->hid);
 481                 if (pidff->block_load_status->value[0] ==
 482                     pidff->status_id[PID_BLOCK_LOAD_SUCCESS]) {
 483                         debug("device reported free memory: %d bytes",
 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                         debug("not enough memory free: %d bytes",
 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         printk(KERN_ERR "hid-pidff: 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         usbhid_wait_io(pidff->hid);
 517         usbhid_submit_report(pidff->hid, pidff->reports[PID_EFFECT_OPERATION],
 518                           USB_DIR_OUT);
 519 }
 520
 521 /**
 522  * Play the effect with effect id @effect_id for @value times
 523  */
 524 static int pidff_playback(struct input_dev *dev, int effect_id, int value)
 525 {
 526         struct pidff_device *pidff = dev->ff->private;
 527
 528         pidff_playback_pid(pidff, pidff->pid_id[effect_id], value);
 529
 530         return 0;
 531 }
 532
 533 /*
 534  * Erase effect with PID id
 535  */
 536 static void pidff_erase_pid(struct pidff_device *pidff, int pid_id)
 537 {
 538         pidff->block_free[PID_EFFECT_BLOCK_INDEX].value[0] = pid_id;
 539         usbhid_submit_report(pidff->hid, pidff->reports[PID_BLOCK_FREE],
 540                           USB_DIR_OUT);
 541 }
 542
 543 /*
 544  * Stop and erase effect with effect_id
 545  */
 546 static int pidff_erase_effect(struct input_dev *dev, int effect_id)
 547 {
 548         struct pidff_device *pidff = dev->ff->private;
 549         int pid_id = pidff->pid_id[effect_id];
 550
 551         debug("starting to erase %d/%d", effect_id, pidff->pid_id[effect_id]);
 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_START_DELAY].value[0] = 0;
 743
 744         usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_EFFECT],
 745                           USB_DIR_OUT);
 746 }
 747
 748 /*
 749  * pidff_set_autocenter() handler
 750  */
 751 static void pidff_set_autocenter(struct input_dev *dev, u16 magnitude)
 752 {
 753         struct pidff_device *pidff = dev->ff->private;
 754
 755         pidff_autocenter(pidff, magnitude);
 756 }
 757
 758 /*
 759  * Find fields from a report and fill a pidff_usage
 760  */
 761 static int pidff_find_fields(struct pidff_usage *usage, const u8 *table,
 762                              struct hid_report *report, int count, int strict)
 763 {
 764         int i, j, k, found;
 765
 766         for (k = 0; k < count; k++) {
 767                 found = 0;
 768                 for (i = 0; i < report->maxfield; i++) {
 769                         if (report->field[i]->maxusage !=
 770                             report->field[i]->report_count) {
 771                                 debug("maxusage and report_count do not match, "
 772                                       "skipping");
 773                                 continue;
 774                         }
 775                         for (j = 0; j < report->field[i]->maxusage; j++) {
 776                                 if (report->field[i]->usage[j].hid ==
 777                                     (HID_UP_PID | table[k])) {
 778                                         debug("found %d at %d->%d", k, i, j);
 779                                         usage[k].field = report->field[i];
 780                                         usage[k].value =
 781                                                 &report->field[i]->value[j];
 782                                         found = 1;
 783                                         break;
 784                                 }
 785                         }
 786                         if (found)
 787                                 break;
 788                 }
 789                 if (!found && strict) {
 790                         debug("failed to locate %d", k);
 791                         return -1;
 792                 }
 793         }
 794         return 0;
 795 }
 796
 797 /*
 798  * Return index into pidff_reports for the given usage
 799  */
 800 static int pidff_check_usage(int usage)
 801 {
 802         int i;
 803
 804         for (i = 0; i < sizeof(pidff_reports); i++)
 805                 if (usage == (HID_UP_PID | pidff_reports[i]))
 806                         return i;
 807
 808         return -1;
 809 }
 810
 811 /*
 812  * Find the reports and fill pidff->reports[]
 813  * report_type specifies either OUTPUT or FEATURE reports
 814  */
 815 static void pidff_find_reports(struct hid_device *hid, int report_type,
 816                                struct pidff_device *pidff)
 817 {
 818         struct hid_report *report;
 819         int i, ret;
 820
 821         list_for_each_entry(report,
 822                             &hid->report_enum[report_type].report_list, list) {
 823                 if (report->maxfield < 1)
 824                         continue;
 825                 ret = pidff_check_usage(report->field[0]->logical);
 826                 if (ret != -1) {
 827                         debug("found usage 0x%02x from field->logical",
 828                               pidff_reports[ret]);
 829                         pidff->reports[ret] = report;
 830                         continue;
 831                 }
 832
 833                 /*
 834                  * Sometimes logical collections are stacked to indicate
 835                  * different usages for the report and the field, in which
 836                  * case we want the usage of the parent. However, Linux HID
 837                  * implementation hides this fact, so we have to dig it up
 838                  * ourselves
 839                  */
 840                 i = report->field[0]->usage[0].collection_index;
 841                 if (i <= 0 ||
 842                     hid->collection[i - 1].type != HID_COLLECTION_LOGICAL)
 843                         continue;
 844                 ret = pidff_check_usage(hid->collection[i - 1].usage);
 845                 if (ret != -1 && !pidff->reports[ret]) {
 846                         debug("found usage 0x%02x from collection array",
 847                               pidff_reports[ret]);
 848                         pidff->reports[ret] = report;
 849                 }
 850         }
 851 }
 852
 853 /*
 854  * Test if the required reports have been found
 855  */
 856 static int pidff_reports_ok(struct pidff_device *pidff)
 857 {
 858         int i;
 859
 860         for (i = 0; i <= PID_REQUIRED_REPORTS; i++) {
 861                 if (!pidff->reports[i]) {
 862                         debug("%d missing", i);
 863                         return 0;
 864                 }
 865         }
 866
 867         return 1;
 868 }
 869
 870 /*
 871  * Find a field with a specific usage within a report
 872  */
 873 static struct hid_field *pidff_find_special_field(struct hid_report *report,
 874                                                   int usage, int enforce_min)
 875 {
 876         int i;
 877
 878         for (i = 0; i < report->maxfield; i++) {
 879                 if (report->field[i]->logical == (HID_UP_PID | usage) &&
 880                     report->field[i]->report_count > 0) {
 881                         if (!enforce_min ||
 882                             report->field[i]->logical_minimum == 1)
 883                                 return report->field[i];
 884                         else {
 885                                 printk(KERN_ERR "hid-pidff: logical_minimum "
 886                                         "is not 1 as it should be\n");
 887                                 return NULL;
 888                         }
 889                 }
 890         }
 891         return NULL;
 892 }
 893
 894 /*
 895  * Fill a pidff->*_id struct table
 896  */
 897 static int pidff_find_special_keys(int *keys, struct hid_field *fld,
 898                                    const u8 *usagetable, int count)
 899 {
 900
 901         int i, j;
 902         int found = 0;
 903
 904         for (i = 0; i < count; i++) {
 905                 for (j = 0; j < fld->maxusage; j++) {
 906                         if (fld->usage[j].hid == (HID_UP_PID | usagetable[i])) {
 907                                 keys[i] = j + 1;
 908                                 found++;
 909                                 break;
 910                         }
 911                 }
 912         }
 913         return found;
 914 }
 915
 916 #define PIDFF_FIND_SPECIAL_KEYS(keys, field, name) \
 917         pidff_find_special_keys(pidff->keys, pidff->field, pidff_ ## name, \
 918                 sizeof(pidff_ ## name))
 919
 920 /*
 921  * Find and check the special fields
 922  */
 923 static int pidff_find_special_fields(struct pidff_device *pidff)
 924 {
 925         debug("finding special fields");
 926
 927         pidff->create_new_effect_type =
 928                 pidff_find_special_field(pidff->reports[PID_CREATE_NEW_EFFECT],
 929                                          0x25, 1);
 930         pidff->set_effect_type =
 931                 pidff_find_special_field(pidff->reports[PID_SET_EFFECT],
 932                                          0x25, 1);
 933         pidff->effect_direction =
 934                 pidff_find_special_field(pidff->reports[PID_SET_EFFECT],
 935                                          0x57, 0);
 936         pidff->device_control =
 937                 pidff_find_special_field(pidff->reports[PID_DEVICE_CONTROL],
 938                                          0x96, 1);
 939         pidff->block_load_status =
 940                 pidff_find_special_field(pidff->reports[PID_BLOCK_LOAD],
 941                                          0x8b, 1);
 942         pidff->effect_operation_status =
 943                 pidff_find_special_field(pidff->reports[PID_EFFECT_OPERATION],
 944                                          0x78, 1);
 945
 946         debug("search done");
 947
 948         if (!pidff->create_new_effect_type || !pidff->set_effect_type) {
 949                 printk(KERN_ERR "hid-pidff: effect lists not found\n");
 950                 return -1;
 951         }
 952
 953         if (!pidff->effect_direction) {
 954                 printk(KERN_ERR "hid-pidff: direction field not found\n");
 955                 return -1;
 956         }
 957
 958         if (!pidff->device_control) {
 959                 printk(KERN_ERR "hid-pidff: device control field not found\n");
 960                 return -1;
 961         }
 962
 963         if (!pidff->block_load_status) {
 964                 printk(KERN_ERR
 965                        "hid-pidff: block load status field not found\n");
 966                 return -1;
 967         }
 968
 969         if (!pidff->effect_operation_status) {
 970                 printk(KERN_ERR
 971                        "hid-pidff: effect operation field not found\n");
 972                 return -1;
 973         }
 974
 975         pidff_find_special_keys(pidff->control_id, pidff->device_control,
 976                                 pidff_device_control,
 977                                 sizeof(pidff_device_control));
 978
 979         PIDFF_FIND_SPECIAL_KEYS(control_id, device_control, device_control);
 980
 981         if (!PIDFF_FIND_SPECIAL_KEYS(type_id, create_new_effect_type,
 982                                      effect_types)) {
 983                 printk(KERN_ERR "hid-pidff: no effect types found\n");
 984                 return -1;
 985         }
 986
 987         if (PIDFF_FIND_SPECIAL_KEYS(status_id, block_load_status,
 988                                     block_load_status) !=
 989                         sizeof(pidff_block_load_status)) {
 990                 printk(KERN_ERR
 991                        "hidpidff: block load status identifiers not found\n");
 992                 return -1;
 993         }
 994
 995         if (PIDFF_FIND_SPECIAL_KEYS(operation_id, effect_operation_status,
 996                                     effect_operation_status) !=
 997                         sizeof(pidff_effect_operation_status)) {
 998                 printk(KERN_ERR
 999                        "hidpidff: 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                         printk(KERN_ERR "hid-pidff: "
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                 printk(KERN_ERR
1075                        "hid-pidff: unknown set_effect report layout\n");
1076                 return -ENODEV;
1077         }
1078
1079         PIDFF_FIND_FIELDS(block_load, PID_BLOCK_LOAD, 0);
1080         if (!pidff->block_load[PID_EFFECT_BLOCK_INDEX].value) {
1081                 printk(KERN_ERR
1082                        "hid-pidff: unknown pid_block_load report layout\n");
1083                 return -ENODEV;
1084         }
1085
1086         if (PIDFF_FIND_FIELDS(effect_operation, PID_EFFECT_OPERATION, 1)) {
1087                 printk(KERN_ERR
1088                        "hid-pidff: unknown effect_operation report layout\n");
1089                 return -ENODEV;
1090         }
1091
1092         if (PIDFF_FIND_FIELDS(block_free, PID_BLOCK_FREE, 1)) {
1093                 printk(KERN_ERR
1094                        "hid-pidff: unknown pid_block_free report layout\n");
1095                 return -ENODEV;
1096         }
1097
1098         if (!PIDFF_FIND_FIELDS(set_envelope, PID_SET_ENVELOPE, 1))
1099                 envelope_ok = 1;
1100
1101         if (pidff_find_special_fields(pidff) || pidff_find_effects(pidff, dev))
1102                 return -ENODEV;
1103
1104         if (!envelope_ok) {
1105                 if (test_and_clear_bit(FF_CONSTANT, dev->ffbit))
1106                         printk(KERN_WARNING "hid-pidff: "
1107                                "has constant effect but no envelope\n");
1108                 if (test_and_clear_bit(FF_RAMP, dev->ffbit))
1109                         printk(KERN_WARNING "hid-pidff: "
1110                                 "has ramp effect but no envelope\n");
1111
1112                 if (test_and_clear_bit(FF_PERIODIC, dev->ffbit))
1113                         printk(KERN_WARNING "hid-pidff: "
1114                                 "has periodic effect but no envelope\n");
1115         }
1116
1117         if (test_bit(FF_CONSTANT, dev->ffbit) &&
1118             PIDFF_FIND_FIELDS(set_constant, PID_SET_CONSTANT, 1)) {
1119                 printk(KERN_WARNING
1120                        "hid-pidff: unknown constant effect layout\n");
1121                 clear_bit(FF_CONSTANT, dev->ffbit);
1122         }
1123
1124         if (test_bit(FF_RAMP, dev->ffbit) &&
1125             PIDFF_FIND_FIELDS(set_ramp, PID_SET_RAMP, 1)) {
1126                 printk(KERN_WARNING "hid-pidff: unknown ramp effect layout\n");
1127                 clear_bit(FF_RAMP, dev->ffbit);
1128         }
1129
1130         if ((test_bit(FF_SPRING, dev->ffbit) ||
1131              test_bit(FF_DAMPER, dev->ffbit) ||
1132              test_bit(FF_FRICTION, dev->ffbit) ||
1133              test_bit(FF_INERTIA, dev->ffbit)) &&
1134             PIDFF_FIND_FIELDS(set_condition, PID_SET_CONDITION, 1)) {
1135                 printk(KERN_WARNING
1136                        "hid-pidff: unknown condition effect layout\n");
1137                 clear_bit(FF_SPRING, dev->ffbit);
1138                 clear_bit(FF_DAMPER, dev->ffbit);
1139                 clear_bit(FF_FRICTION, dev->ffbit);
1140                 clear_bit(FF_INERTIA, dev->ffbit);
1141         }
1142
1143         if (test_bit(FF_PERIODIC, dev->ffbit) &&
1144             PIDFF_FIND_FIELDS(set_periodic, PID_SET_PERIODIC, 1)) {
1145                 printk(KERN_WARNING
1146                        "hid-pidff: unknown periodic effect layout\n");
1147                 clear_bit(FF_PERIODIC, dev->ffbit);
1148         }
1149
1150         PIDFF_FIND_FIELDS(pool, PID_POOL, 0);
1151
1152         if (!PIDFF_FIND_FIELDS(device_gain, PID_DEVICE_GAIN, 1))
1153                 set_bit(FF_GAIN, dev->ffbit);
1154
1155         return 0;
1156 }
1157
1158 /*
1159  * Reset the device
1160  */
1161 static void pidff_reset(struct pidff_device *pidff)
1162 {
1163         struct hid_device *hid = pidff->hid;
1164         int i = 0;
1165
1166         pidff->device_control->value[0] = pidff->control_id[PID_RESET];
1167         /* We reset twice as sometimes hid_wait_io isn't waiting long enough */
1168         usbhid_submit_report(hid, pidff->reports[PID_DEVICE_CONTROL], USB_DIR_OUT);
1169         usbhid_wait_io(hid);
1170         usbhid_submit_report(hid, pidff->reports[PID_DEVICE_CONTROL], USB_DIR_OUT);
1171         usbhid_wait_io(hid);
1172
1173         pidff->device_control->value[0] =
1174                 pidff->control_id[PID_ENABLE_ACTUATORS];
1175         usbhid_submit_report(hid, pidff->reports[PID_DEVICE_CONTROL], USB_DIR_OUT);
1176         usbhid_wait_io(hid);
1177
1178         /* pool report is sometimes messed up, refetch it */
1179         usbhid_submit_report(hid, pidff->reports[PID_POOL], USB_DIR_IN);
1180         usbhid_wait_io(hid);
1181
1182         if (pidff->pool[PID_SIMULTANEOUS_MAX].value) {
1183                 int sim_effects = pidff->pool[PID_SIMULTANEOUS_MAX].value[0];
1184                 while (sim_effects < 2) {
1185                         if (i++ > 20) {
1186                                 printk(KERN_WARNING "hid-pidff: device reports "
1187                                        "%d simultaneous effects\n",
1188                                        sim_effects);
1189                                 break;
1190                         }
1191                         debug("pid_pool requested again");
1192                         usbhid_submit_report(hid, pidff->reports[PID_POOL],
1193                                           USB_DIR_IN);
1194                         usbhid_wait_io(hid);
1195                 }
1196         }
1197 }
1198
1199 /*
1200  * Test if autocenter modification is using the supported method
1201  */
1202 static int pidff_check_autocenter(struct pidff_device *pidff,
1203                                   struct input_dev *dev)
1204 {
1205         int error;
1206
1207         /*
1208          * Let's find out if autocenter modification is supported
1209          * Specification doesn't specify anything, so we request an
1210          * effect upload and cancel it immediately. If the approved
1211          * effect id was one above the minimum, then we assume the first
1212          * effect id is a built-in spring type effect used for autocenter
1213          */
1214
1215         error = pidff_request_effect_upload(pidff, 1);
1216         if (error) {
1217                 printk(KERN_ERR "hid-pidff: upload request failed\n");
1218                 return error;
1219         }
1220
1221         if (pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] ==
1222             pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum + 1) {
1223                 pidff_autocenter(pidff, 0xffff);
1224                 set_bit(FF_AUTOCENTER, dev->ffbit);
1225         } else {
1226                 printk(KERN_NOTICE "hid-pidff: "
1227                        "device has unknown autocenter control method\n");
1228         }
1229
1230         pidff_erase_pid(pidff,
1231                         pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0]);
1232
1233         return 0;
1234
1235 }
1236
1237 /*
1238  * Check if the device is PID and initialize it
1239  */
1240 int hid_pidff_init(struct hid_device *hid)
1241 {
1242         struct pidff_device *pidff;
1243         struct hid_input *hidinput = list_entry(hid->inputs.next,
1244                                                 struct hid_input, list);
1245         struct input_dev *dev = hidinput->input;
1246         struct ff_device *ff;
1247         int max_effects;
1248         int error;
1249
1250         debug("starting pid init");
1251
1252         if (list_empty(&hid->report_enum[HID_OUTPUT_REPORT].report_list)) {
1253                 debug("not a PID device, no output report");
1254                 return -ENODEV;
1255         }
1256
1257         pidff = kzalloc(sizeof(*pidff), GFP_KERNEL);
1258         if (!pidff)
1259                 return -ENOMEM;
1260
1261         pidff->hid = hid;
1262
1263         pidff_find_reports(hid, HID_OUTPUT_REPORT, pidff);
1264         pidff_find_reports(hid, HID_FEATURE_REPORT, pidff);
1265
1266         if (!pidff_reports_ok(pidff)) {
1267                 debug("reports not ok, aborting");
1268                 error = -ENODEV;
1269                 goto fail;
1270         }
1271
1272         error = pidff_init_fields(pidff, dev);
1273         if (error)
1274                 goto fail;
1275
1276         pidff_reset(pidff);
1277
1278         if (test_bit(FF_GAIN, dev->ffbit)) {
1279                 pidff_set(&pidff->device_gain[PID_DEVICE_GAIN_FIELD], 0xffff);
1280                 usbhid_submit_report(pidff->hid, pidff->reports[PID_DEVICE_GAIN],
1281                                   USB_DIR_OUT);
1282         }
1283
1284         error = pidff_check_autocenter(pidff, dev);
1285         if (error)
1286                 goto fail;
1287
1288         max_effects =
1289             pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_maximum -
1290             pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum +
1291             1;
1292         debug("max effects is %d", max_effects);
1293
1294         if (max_effects > PID_EFFECTS_MAX)
1295                 max_effects = PID_EFFECTS_MAX;
1296
1297         if (pidff->pool[PID_SIMULTANEOUS_MAX].value)
1298                 debug("max simultaneous effects is %d",
1299                       pidff->pool[PID_SIMULTANEOUS_MAX].value[0]);
1300
1301         if (pidff->pool[PID_RAM_POOL_SIZE].value)
1302                 debug("device memory size is %d bytes",
1303                       pidff->pool[PID_RAM_POOL_SIZE].value[0]);
1304
1305         if (pidff->pool[PID_DEVICE_MANAGED_POOL].value &&
1306             pidff->pool[PID_DEVICE_MANAGED_POOL].value[0] == 0) {
1307                 printk(KERN_NOTICE "hid-pidff: "
1308                        "device does not support device managed pool\n");
1309                 goto fail;
1310         }
1311
1312         error = input_ff_create(dev, max_effects);
1313         if (error)
1314                 goto fail;
1315
1316         ff = dev->ff;
1317         ff->private = pidff;
1318         ff->upload = pidff_upload_effect;
1319         ff->erase = pidff_erase_effect;
1320         ff->set_gain = pidff_set_gain;
1321         ff->set_autocenter = pidff_set_autocenter;
1322         ff->playback = pidff_playback;
1323
1324         printk(KERN_INFO "Force feedback for USB HID PID devices by "
1325                "Anssi Hannula <anssi.hannula@gmail.com>\n");
1326
1327         return 0;
1328
1329  fail:
1330         kfree(pidff);
1331         return error;
1332 }