drivers/usb/input/hid-lgff.c

   1 /*
   2  * $$
   3  *
   4  * Force feedback support for hid-compliant for some of the devices from
   5  * Logitech, namely:
   6  * - WingMan Cordless RumblePad
   7  * - WingMan Force 3D
   8  *
   9  *  Copyright (c) 2002-2004 Johann Deneux
  10  */
  11
  12 /*
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  *
  27  * Should you need to contact me, the author, you can do so by
  28  * e-mail - mail your message to <johann.deneux@it.uu.se>
  29  */
  30
  31 #include <linux/input.h>
  32 #include <linux/sched.h>
  33
  34 //#define DEBUG
  35 #include <linux/usb.h>
  36
  37 #include <linux/circ_buf.h>
  38
  39 #include "hid.h"
  40 #include "fixp-arith.h"
  41
  42
  43 /* Periodicity of the update */
  44 #define PERIOD (HZ/10)
  45
  46 #define RUN_AT(t) (jiffies + (t))
  47
  48 /* Effect status */
  49 #define EFFECT_STARTED 0     /* Effect is going to play after some time
  50                                 (ff_replay.delay) */
  51 #define EFFECT_PLAYING 1     /* Effect is being played */
  52 #define EFFECT_USED    2
  53
  54 // For lgff_device::flags
  55 #define DEVICE_CLOSING 0     /* The driver is being unitialised */
  56
  57 /* Check that the current process can access an effect */
  58 #define CHECK_OWNERSHIP(effect) (current->pid == 0 \
  59         || effect.owner == current->pid)
  60
  61 #define LGFF_CHECK_OWNERSHIP(i, l) \
  62         (i>=0 && i<LGFF_EFFECTS \
  63         && test_bit(EFFECT_USED, l->effects[i].flags) \
  64         && CHECK_OWNERSHIP(l->effects[i]))
  65
  66 #define LGFF_EFFECTS 8
  67
  68 struct device_type {
  69         u16 idVendor;
  70         u16 idProduct;
  71         signed short *ff;
  72 };
  73
  74 struct lgff_effect {
  75         pid_t owner;
  76
  77         struct ff_effect effect;
  78
  79         unsigned long flags[1];
  80         unsigned int count;          /* Number of times left to play */
  81         unsigned long started_at;    /* When the effect started to play */
  82 };
  83
  84 struct lgff_device {
  85         struct hid_device* hid;
  86
  87         struct hid_report* constant;
  88         struct hid_report* rumble;
  89         struct hid_report* condition;
  90
  91         struct lgff_effect effects[LGFF_EFFECTS];
  92         spinlock_t lock;             /* device-level lock. Having locks on
  93                                         a per-effect basis could be nice, but
  94                                         isn't really necessary */
  95
  96         unsigned long flags[1];      /* Contains various information about the
  97                                         state of the driver for this device */
  98
  99         struct timer_list timer;
 100 };
 101
 102 /* Callbacks */
 103 static void hid_lgff_exit(struct hid_device* hid);
 104 static int hid_lgff_event(struct hid_device *hid, struct input_dev *input,
 105                           unsigned int type, unsigned int code, int value);
 106 static int hid_lgff_flush(struct input_dev *input, struct file *file);
 107 static int hid_lgff_upload_effect(struct input_dev *input,
 108                                   struct ff_effect *effect);
 109 static int hid_lgff_erase(struct input_dev *input, int id);
 110
 111 /* Local functions */
 112 static void hid_lgff_input_init(struct hid_device* hid);
 113 static void hid_lgff_timer(unsigned long timer_data);
 114 static struct hid_report* hid_lgff_duplicate_report(struct hid_report*);
 115 static void hid_lgff_delete_report(struct hid_report*);
 116
 117 static signed short ff_rumble[] = {
 118         FF_RUMBLE,
 119         -1
 120 };
 121
 122 static signed short ff_joystick[] = {
 123         FF_CONSTANT,
 124         -1
 125 };
 126
 127 static struct device_type devices[] = {
 128         {0x046d, 0xc211, ff_rumble},
 129         {0x046d, 0xc283, ff_joystick},
 130         {0x0000, 0x0000, ff_joystick}
 131 };
 132
 133 int hid_lgff_init(struct hid_device* hid)
 134 {
 135         struct lgff_device *private;
 136         struct hid_report* report;
 137         struct hid_field* field;
 138
 139         /* Find the report to use */
 140         if (list_empty(&hid->report_enum[HID_OUTPUT_REPORT].report_list)) {
 141                 err("No output report found");
 142                 return -1;
 143         }
 144         /* Check that the report looks ok */
 145         report = (struct hid_report*)hid->report_enum[HID_OUTPUT_REPORT].report_list.next;
 146         if (!report) {
 147                 err("NULL output report");
 148                 return -1;
 149         }
 150         field = report->field[0];
 151         if (!field) {
 152                 err("NULL field");
 153                 return -1;
 154         }
 155
 156         private = kmalloc(sizeof(struct lgff_device), GFP_KERNEL);
 157         if (!private)
 158                 return -1;
 159         memset(private, 0, sizeof(struct lgff_device));
 160         hid->ff_private = private;
 161
 162         /* Input init */
 163         hid_lgff_input_init(hid);
 164
 165
 166         private->constant = hid_lgff_duplicate_report(report);
 167         if (!private->constant) {
 168                 kfree(private);
 169                 return -1;
 170         }
 171         private->constant->field[0]->value[0] = 0x51;
 172         private->constant->field[0]->value[1] = 0x08;
 173         private->constant->field[0]->value[2] = 0x7f;
 174         private->constant->field[0]->value[3] = 0x7f;
 175
 176         private->rumble = hid_lgff_duplicate_report(report);
 177         if (!private->rumble) {
 178                 hid_lgff_delete_report(private->constant);
 179                 kfree(private);
 180                 return -1;
 181         }
 182         private->rumble->field[0]->value[0] = 0x42;
 183
 184
 185         private->condition = hid_lgff_duplicate_report(report);
 186         if (!private->condition) {
 187                 hid_lgff_delete_report(private->rumble);
 188                 hid_lgff_delete_report(private->constant);
 189                 kfree(private);
 190                 return -1;
 191         }
 192
 193         private->hid = hid;
 194
 195         spin_lock_init(&private->lock);
 196         init_timer(&private->timer);
 197         private->timer.data = (unsigned long)private;
 198         private->timer.function = hid_lgff_timer;
 199
 200         /* Event and exit callbacks */
 201         hid->ff_exit = hid_lgff_exit;
 202         hid->ff_event = hid_lgff_event;
 203
 204         /* Start the update task */
 205         private->timer.expires = RUN_AT(PERIOD);
 206         add_timer(&private->timer);  /*TODO: only run the timer when at least
 207                                        one effect is playing */
 208
 209         printk(KERN_INFO "Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
 210
 211         return 0;
 212 }
 213
 214 static struct hid_report* hid_lgff_duplicate_report(struct hid_report* report)
 215 {
 216         struct hid_report* ret;
 217
 218         ret = kmalloc(sizeof(struct lgff_device), GFP_KERNEL);
 219         if (!ret)
 220                 return NULL;
 221         *ret = *report;
 222
 223         ret->field[0] = kmalloc(sizeof(struct hid_field), GFP_KERNEL);
 224         if (!ret->field[0]) {
 225                 kfree(ret);
 226                 return NULL;
 227         }
 228         *ret->field[0] = *report->field[0];
 229
 230         ret->field[0]->value = kmalloc(sizeof(s32[8]), GFP_KERNEL);
 231         if (!ret->field[0]->value) {
 232                 kfree(ret->field[0]);
 233                 kfree(ret);
 234                 return NULL;
 235         }
 236         memset(ret->field[0]->value, 0, sizeof(s32[8]));
 237
 238         return ret;
 239 }
 240
 241 static void hid_lgff_delete_report(struct hid_report* report)
 242 {
 243         if (report) {
 244                 kfree(report->field[0]->value);
 245                 kfree(report->field[0]);
 246                 kfree(report);
 247         }
 248 }
 249
 250 static void hid_lgff_input_init(struct hid_device* hid)
 251 {
 252         struct device_type* dev = devices;
 253         signed short* ff;
 254         u16 idVendor = hid->dev->descriptor.idVendor;
 255         u16 idProduct = hid->dev->descriptor.idProduct;
 256         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 257
 258         while (dev->idVendor && (idVendor != dev->idVendor || idProduct != dev->idProduct))
 259                 dev++;
 260
 261         ff = dev->ff;
 262
 263         while (*ff >= 0) {
 264                 set_bit(*ff, hidinput->input.ffbit);
 265                 ++ff;
 266         }
 267
 268         hidinput->input.upload_effect = hid_lgff_upload_effect;
 269         hidinput->input.flush = hid_lgff_flush;
 270
 271         set_bit(EV_FF, hidinput->input.evbit);
 272         hidinput->input.ff_effects_max = LGFF_EFFECTS;
 273 }
 274
 275 static void hid_lgff_exit(struct hid_device* hid)
 276 {
 277         struct lgff_device *lgff = hid->ff_private;
 278
 279         set_bit(DEVICE_CLOSING, lgff->flags);
 280         del_timer_sync(&lgff->timer);
 281
 282         hid_lgff_delete_report(lgff->condition);
 283         hid_lgff_delete_report(lgff->rumble);
 284         hid_lgff_delete_report(lgff->constant);
 285
 286         kfree(lgff);
 287 }
 288
 289 static int hid_lgff_event(struct hid_device *hid, struct input_dev* input,
 290                           unsigned int type, unsigned int code, int value)
 291 {
 292         struct lgff_device *lgff = hid->ff_private;
 293         struct lgff_effect *effect = lgff->effects + code;
 294         unsigned long flags;
 295
 296         if (type != EV_FF)                     return -EINVAL;
 297         if (!LGFF_CHECK_OWNERSHIP(code, lgff)) return -EACCES;
 298         if (value < 0)                         return -EINVAL;
 299
 300         spin_lock_irqsave(&lgff->lock, flags);
 301
 302         if (value > 0) {
 303                 if (test_bit(EFFECT_STARTED, effect->flags)) {
 304                         spin_unlock_irqrestore(&lgff->lock, flags);
 305                         return -EBUSY;
 306                 }
 307                 if (test_bit(EFFECT_PLAYING, effect->flags)) {
 308                         spin_unlock_irqrestore(&lgff->lock, flags);
 309                         return -EBUSY;
 310                 }
 311
 312                 effect->count = value;
 313
 314                 if (effect->effect.replay.delay) {
 315                         set_bit(EFFECT_STARTED, effect->flags);
 316                 } else {
 317                         set_bit(EFFECT_PLAYING, effect->flags);
 318                 }
 319                 effect->started_at = jiffies;
 320         }
 321         else { /* value == 0 */
 322                 clear_bit(EFFECT_STARTED, effect->flags);
 323                 clear_bit(EFFECT_PLAYING, effect->flags);
 324         }
 325
 326         spin_unlock_irqrestore(&lgff->lock, flags);
 327
 328         return 0;
 329
 330 }
 331
 332 /* Erase all effects this process owns */
 333 static int hid_lgff_flush(struct input_dev *dev, struct file *file)
 334 {
 335         struct hid_device *hid = dev->private;
 336         struct lgff_device *lgff = hid->ff_private;
 337         int i;
 338
 339         for (i=0; i<dev->ff_effects_max; ++i) {
 340
 341                 /*NOTE: no need to lock here. The only times EFFECT_USED is
 342                   modified is when effects are uploaded or when an effect is
 343                   erased. But a process cannot close its dev/input/eventX fd
 344                   and perform ioctls on the same fd all at the same time */
 345                 if ( current->pid == lgff->effects[i].owner
 346                      && test_bit(EFFECT_USED, lgff->effects[i].flags)) {
 347
 348                         if (hid_lgff_erase(dev, i))
 349                                 warn("erase effect %d failed", i);
 350                 }
 351
 352         }
 353
 354         return 0;
 355 }
 356
 357 static int hid_lgff_erase(struct input_dev *dev, int id)
 358 {
 359         struct hid_device *hid = dev->private;
 360         struct lgff_device *lgff = hid->ff_private;
 361         unsigned long flags;
 362
 363         if (!LGFF_CHECK_OWNERSHIP(id, lgff)) return -EACCES;
 364
 365         spin_lock_irqsave(&lgff->lock, flags);
 366         lgff->effects[id].flags[0] = 0;
 367         spin_unlock_irqrestore(&lgff->lock, flags);
 368
 369         return 0;
 370 }
 371
 372 static int hid_lgff_upload_effect(struct input_dev* input,
 373                                   struct ff_effect* effect)
 374 {
 375         struct hid_device *hid = input->private;
 376         struct lgff_device *lgff = hid->ff_private;
 377         struct lgff_effect new;
 378         int id;
 379         unsigned long flags;
 380
 381         dbg("ioctl rumble");
 382
 383         if (!test_bit(effect->type, input->ffbit)) return -EINVAL;
 384
 385         spin_lock_irqsave(&lgff->lock, flags);
 386
 387         if (effect->id == -1) {
 388                 int i;
 389
 390                 for (i=0; i<LGFF_EFFECTS && test_bit(EFFECT_USED, lgff->effects[i].flags); ++i);
 391                 if (i >= LGFF_EFFECTS) {
 392                         spin_unlock_irqrestore(&lgff->lock, flags);
 393                         return -ENOSPC;
 394                 }
 395
 396                 effect->id = i;
 397                 lgff->effects[i].owner = current->pid;
 398                 lgff->effects[i].flags[0] = 0;
 399                 set_bit(EFFECT_USED, lgff->effects[i].flags);
 400         }
 401         else if (!LGFF_CHECK_OWNERSHIP(effect->id, lgff)) {
 402                 spin_unlock_irqrestore(&lgff->lock, flags);
 403                 return -EACCES;
 404         }
 405
 406         id = effect->id;
 407         new = lgff->effects[id];
 408
 409         new.effect = *effect;
 410
 411         if (test_bit(EFFECT_STARTED, lgff->effects[id].flags)
 412             || test_bit(EFFECT_STARTED, lgff->effects[id].flags)) {
 413
 414                 /* Changing replay parameters is not allowed (for the time
 415                    being) */
 416                 if (new.effect.replay.delay != lgff->effects[id].effect.replay.delay
 417                     || new.effect.replay.length != lgff->effects[id].effect.replay.length) {
 418                         spin_unlock_irqrestore(&lgff->lock, flags);
 419                         return -ENOSYS;
 420                 }
 421
 422                 lgff->effects[id] = new;
 423
 424         } else {
 425                 lgff->effects[id] = new;
 426         }
 427
 428         spin_unlock_irqrestore(&lgff->lock, flags);
 429         return 0;
 430 }
 431
 432 static void hid_lgff_timer(unsigned long timer_data)
 433 {
 434         struct lgff_device *lgff = (struct lgff_device*)timer_data;
 435         struct hid_device *hid = lgff->hid;
 436         unsigned long flags;
 437         int x = 0x7f, y = 0x7f;   // Coordinates of constant effects
 438         unsigned int left = 0, right = 0;   // Rumbling
 439         int i;
 440
 441         spin_lock_irqsave(&lgff->lock, flags);
 442
 443         for (i=0; i<LGFF_EFFECTS; ++i) {
 444                 struct lgff_effect* effect = lgff->effects +i;
 445
 446                 if (test_bit(EFFECT_PLAYING, effect->flags)) {
 447
 448                         switch (effect->effect.type) {
 449                         case FF_CONSTANT: {
 450                                 //TODO: handle envelopes
 451                                 int degrees = effect->effect.direction * 360 >> 16;
 452                                 x += fixp_mult(fixp_sin(degrees),
 453                                                fixp_new16(effect->effect.u.constant.level));
 454                                 y += fixp_mult(-fixp_cos(degrees),
 455                                                fixp_new16(effect->effect.u.constant.level));
 456                         }       break;
 457                         case FF_RUMBLE:
 458                                 right += effect->effect.u.rumble.strong_magnitude;
 459                                 left += effect->effect.u.rumble.weak_magnitude;
 460                                 break;
 461                         };
 462
 463                         /* One run of the effect is finished playing */
 464                         if (time_after(jiffies,
 465                                         effect->started_at
 466                                         + effect->effect.replay.delay*HZ/1000
 467                                         + effect->effect.replay.length*HZ/1000)) {
 468                                 dbg("Finished playing once %d", i);
 469                                 if (--effect->count <= 0) {
 470                                         dbg("Stopped %d", i);
 471                                         clear_bit(EFFECT_PLAYING, effect->flags);
 472                                 }
 473                                 else {
 474                                         dbg("Start again %d", i);
 475                                         if (effect->effect.replay.length != 0) {
 476                                                 clear_bit(EFFECT_PLAYING, effect->flags);
 477                                                 set_bit(EFFECT_STARTED, effect->flags);
 478                                         }
 479                                         effect->started_at = jiffies;
 480                                 }
 481                         }
 482
 483                 } else if (test_bit(EFFECT_STARTED, lgff->effects[i].flags)) {
 484                         /* Check if we should start playing the effect */
 485                         if (time_after(jiffies,
 486                                         lgff->effects[i].started_at
 487                                         + lgff->effects[i].effect.replay.delay*HZ/1000)) {
 488                                 dbg("Now playing %d", i);
 489                                 clear_bit(EFFECT_STARTED, lgff->effects[i].flags);
 490                                 set_bit(EFFECT_PLAYING, lgff->effects[i].flags);
 491                         }
 492                 }
 493         }
 494
 495 #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
 496
 497         // Clamp values
 498         CLAMP(x);
 499         CLAMP(y);
 500         CLAMP(left);
 501         CLAMP(right);
 502
 503 #undef CLAMP
 504
 505         if (x != lgff->constant->field[0]->value[2]
 506             || y != lgff->constant->field[0]->value[3]) {
 507                 lgff->constant->field[0]->value[2] = x;
 508                 lgff->constant->field[0]->value[3] = y;
 509                 dbg("(x,y)=(%04x, %04x)", x, y);
 510                 hid_submit_report(hid, lgff->constant, USB_DIR_OUT);
 511         }
 512
 513         if (left != lgff->rumble->field[0]->value[2]
 514             || right != lgff->rumble->field[0]->value[3]) {
 515                 lgff->rumble->field[0]->value[2] = left;
 516                 lgff->rumble->field[0]->value[3] = right;
 517                 dbg("(left,right)=(%04x, %04x)", left, right);
 518                 hid_submit_report(hid, lgff->rumble, USB_DIR_OUT);
 519         }
 520
 521         if (!test_bit(DEVICE_CLOSING, lgff->flags)) {
 522                 lgff->timer.expires = RUN_AT(PERIOD);
 523                 add_timer(&lgff->timer);
 524         }
 525
 526         spin_unlock_irqrestore(&lgff->lock, flags);
 527 }