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, 0xc219, ff_rumble},
 130         {0x046d, 0xc283, ff_joystick},
 131         {0x0000, 0x0000, ff_joystick}
 132 };
 133
 134 int hid_lgff_init(struct hid_device* hid)
 135 {
 136         struct lgff_device *private;
 137         struct hid_report* report;
 138         struct hid_field* field;
 139
 140         /* Find the report to use */
 141         if (list_empty(&hid->report_enum[HID_OUTPUT_REPORT].report_list)) {
 142                 err("No output report found");
 143                 return -1;
 144         }
 145         /* Check that the report looks ok */
 146         report = (struct hid_report*)hid->report_enum[HID_OUTPUT_REPORT].report_list.next;
 147         if (!report) {
 148                 err("NULL output report");
 149                 return -1;
 150         }
 151         field = report->field[0];
 152         if (!field) {
 153                 err("NULL field");
 154                 return -1;
 155         }
 156
 157         private = kmalloc(sizeof(struct lgff_device), GFP_KERNEL);
 158         if (!private)
 159                 return -1;
 160         memset(private, 0, sizeof(struct lgff_device));
 161         hid->ff_private = private;
 162
 163         /* Input init */
 164         hid_lgff_input_init(hid);
 165
 166
 167         private->constant = hid_lgff_duplicate_report(report);
 168         if (!private->constant) {
 169                 kfree(private);
 170                 return -1;
 171         }
 172         private->constant->field[0]->value[0] = 0x51;
 173         private->constant->field[0]->value[1] = 0x08;
 174         private->constant->field[0]->value[2] = 0x7f;
 175         private->constant->field[0]->value[3] = 0x7f;
 176
 177         private->rumble = hid_lgff_duplicate_report(report);
 178         if (!private->rumble) {
 179                 hid_lgff_delete_report(private->constant);
 180                 kfree(private);
 181                 return -1;
 182         }
 183         private->rumble->field[0]->value[0] = 0x42;
 184
 185
 186         private->condition = hid_lgff_duplicate_report(report);
 187         if (!private->condition) {
 188                 hid_lgff_delete_report(private->rumble);
 189                 hid_lgff_delete_report(private->constant);
 190                 kfree(private);
 191                 return -1;
 192         }
 193
 194         private->hid = hid;
 195
 196         spin_lock_init(&private->lock);
 197         init_timer(&private->timer);
 198         private->timer.data = (unsigned long)private;
 199         private->timer.function = hid_lgff_timer;
 200
 201         /* Event and exit callbacks */
 202         hid->ff_exit = hid_lgff_exit;
 203         hid->ff_event = hid_lgff_event;
 204
 205         /* Start the update task */
 206         private->timer.expires = RUN_AT(PERIOD);
 207         add_timer(&private->timer);  /*TODO: only run the timer when at least
 208                                        one effect is playing */
 209
 210         printk(KERN_INFO "Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
 211
 212         return 0;
 213 }
 214
 215 static struct hid_report* hid_lgff_duplicate_report(struct hid_report* report)
 216 {
 217         struct hid_report* ret;
 218
 219         ret = kmalloc(sizeof(struct lgff_device), GFP_KERNEL);
 220         if (!ret)
 221                 return NULL;
 222         *ret = *report;
 223
 224         ret->field[0] = kmalloc(sizeof(struct hid_field), GFP_KERNEL);
 225         if (!ret->field[0]) {
 226                 kfree(ret);
 227                 return NULL;
 228         }
 229         *ret->field[0] = *report->field[0];
 230
 231         ret->field[0]->value = kmalloc(sizeof(s32[8]), GFP_KERNEL);
 232         if (!ret->field[0]->value) {
 233                 kfree(ret->field[0]);
 234                 kfree(ret);
 235                 return NULL;
 236         }
 237         memset(ret->field[0]->value, 0, sizeof(s32[8]));
 238
 239         return ret;
 240 }
 241
 242 static void hid_lgff_delete_report(struct hid_report* report)
 243 {
 244         if (report) {
 245                 kfree(report->field[0]->value);
 246                 kfree(report->field[0]);
 247                 kfree(report);
 248         }
 249 }
 250
 251 static void hid_lgff_input_init(struct hid_device* hid)
 252 {
 253         struct device_type* dev = devices;
 254         signed short* ff;
 255         u16 idVendor = le16_to_cpu(hid->dev->descriptor.idVendor);
 256         u16 idProduct = le16_to_cpu(hid->dev->descriptor.idProduct);
 257         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 258         struct input_dev *input_dev = hidinput->input;
 259
 260         while (dev->idVendor && (idVendor != dev->idVendor || idProduct != dev->idProduct))
 261                 dev++;
 262
 263         for (ff = dev->ff; *ff >= 0; ff++)
 264                 set_bit(*ff, input_dev->ffbit);
 265
 266         input_dev->upload_effect = hid_lgff_upload_effect;
 267         input_dev->flush = hid_lgff_flush;
 268
 269         set_bit(EV_FF, input_dev->evbit);
 270         input_dev->ff_effects_max = LGFF_EFFECTS;
 271 }
 272
 273 static void hid_lgff_exit(struct hid_device* hid)
 274 {
 275         struct lgff_device *lgff = hid->ff_private;
 276
 277         set_bit(DEVICE_CLOSING, lgff->flags);
 278         del_timer_sync(&lgff->timer);
 279
 280         hid_lgff_delete_report(lgff->condition);
 281         hid_lgff_delete_report(lgff->rumble);
 282         hid_lgff_delete_report(lgff->constant);
 283
 284         kfree(lgff);
 285 }
 286
 287 static int hid_lgff_event(struct hid_device *hid, struct input_dev* input,
 288                           unsigned int type, unsigned int code, int value)
 289 {
 290         struct lgff_device *lgff = hid->ff_private;
 291         struct lgff_effect *effect = lgff->effects + code;
 292         unsigned long flags;
 293
 294         if (type != EV_FF)                     return -EINVAL;
 295         if (!LGFF_CHECK_OWNERSHIP(code, lgff)) return -EACCES;
 296         if (value < 0)                         return -EINVAL;
 297
 298         spin_lock_irqsave(&lgff->lock, flags);
 299
 300         if (value > 0) {
 301                 if (test_bit(EFFECT_STARTED, effect->flags)) {
 302                         spin_unlock_irqrestore(&lgff->lock, flags);
 303                         return -EBUSY;
 304                 }
 305                 if (test_bit(EFFECT_PLAYING, effect->flags)) {
 306                         spin_unlock_irqrestore(&lgff->lock, flags);
 307                         return -EBUSY;
 308                 }
 309
 310                 effect->count = value;
 311
 312                 if (effect->effect.replay.delay) {
 313                         set_bit(EFFECT_STARTED, effect->flags);
 314                 } else {
 315                         set_bit(EFFECT_PLAYING, effect->flags);
 316                 }
 317                 effect->started_at = jiffies;
 318         }
 319         else { /* value == 0 */
 320                 clear_bit(EFFECT_STARTED, effect->flags);
 321                 clear_bit(EFFECT_PLAYING, effect->flags);
 322         }
 323
 324         spin_unlock_irqrestore(&lgff->lock, flags);
 325
 326         return 0;
 327
 328 }
 329
 330 /* Erase all effects this process owns */
 331 static int hid_lgff_flush(struct input_dev *dev, struct file *file)
 332 {
 333         struct hid_device *hid = dev->private;
 334         struct lgff_device *lgff = hid->ff_private;
 335         int i;
 336
 337         for (i=0; i<dev->ff_effects_max; ++i) {
 338
 339                 /*NOTE: no need to lock here. The only times EFFECT_USED is
 340                   modified is when effects are uploaded or when an effect is
 341                   erased. But a process cannot close its dev/input/eventX fd
 342                   and perform ioctls on the same fd all at the same time */
 343                 if ( current->pid == lgff->effects[i].owner
 344                      && test_bit(EFFECT_USED, lgff->effects[i].flags)) {
 345
 346                         if (hid_lgff_erase(dev, i))
 347                                 warn("erase effect %d failed", i);
 348                 }
 349
 350         }
 351
 352         return 0;
 353 }
 354
 355 static int hid_lgff_erase(struct input_dev *dev, int id)
 356 {
 357         struct hid_device *hid = dev->private;
 358         struct lgff_device *lgff = hid->ff_private;
 359         unsigned long flags;
 360
 361         if (!LGFF_CHECK_OWNERSHIP(id, lgff)) return -EACCES;
 362
 363         spin_lock_irqsave(&lgff->lock, flags);
 364         lgff->effects[id].flags[0] = 0;
 365         spin_unlock_irqrestore(&lgff->lock, flags);
 366
 367         return 0;
 368 }
 369
 370 static int hid_lgff_upload_effect(struct input_dev* input,
 371                                   struct ff_effect* effect)
 372 {
 373         struct hid_device *hid = input->private;
 374         struct lgff_device *lgff = hid->ff_private;
 375         struct lgff_effect new;
 376         int id;
 377         unsigned long flags;
 378
 379         dbg("ioctl rumble");
 380
 381         if (!test_bit(effect->type, input->ffbit)) return -EINVAL;
 382
 383         spin_lock_irqsave(&lgff->lock, flags);
 384
 385         if (effect->id == -1) {
 386                 int i;
 387
 388                 for (i=0; i<LGFF_EFFECTS && test_bit(EFFECT_USED, lgff->effects[i].flags); ++i);
 389                 if (i >= LGFF_EFFECTS) {
 390                         spin_unlock_irqrestore(&lgff->lock, flags);
 391                         return -ENOSPC;
 392                 }
 393
 394                 effect->id = i;
 395                 lgff->effects[i].owner = current->pid;
 396                 lgff->effects[i].flags[0] = 0;
 397                 set_bit(EFFECT_USED, lgff->effects[i].flags);
 398         }
 399         else if (!LGFF_CHECK_OWNERSHIP(effect->id, lgff)) {
 400                 spin_unlock_irqrestore(&lgff->lock, flags);
 401                 return -EACCES;
 402         }
 403
 404         id = effect->id;
 405         new = lgff->effects[id];
 406
 407         new.effect = *effect;
 408
 409         if (test_bit(EFFECT_STARTED, lgff->effects[id].flags)
 410             || test_bit(EFFECT_STARTED, lgff->effects[id].flags)) {
 411
 412                 /* Changing replay parameters is not allowed (for the time
 413                    being) */
 414                 if (new.effect.replay.delay != lgff->effects[id].effect.replay.delay
 415                     || new.effect.replay.length != lgff->effects[id].effect.replay.length) {
 416                         spin_unlock_irqrestore(&lgff->lock, flags);
 417                         return -ENOSYS;
 418                 }
 419
 420                 lgff->effects[id] = new;
 421
 422         } else {
 423                 lgff->effects[id] = new;
 424         }
 425
 426         spin_unlock_irqrestore(&lgff->lock, flags);
 427         return 0;
 428 }
 429
 430 static void hid_lgff_timer(unsigned long timer_data)
 431 {
 432         struct lgff_device *lgff = (struct lgff_device*)timer_data;
 433         struct hid_device *hid = lgff->hid;
 434         unsigned long flags;
 435         int x = 0x7f, y = 0x7f;   // Coordinates of constant effects
 436         unsigned int left = 0, right = 0;   // Rumbling
 437         int i;
 438
 439         spin_lock_irqsave(&lgff->lock, flags);
 440
 441         for (i=0; i<LGFF_EFFECTS; ++i) {
 442                 struct lgff_effect* effect = lgff->effects +i;
 443
 444                 if (test_bit(EFFECT_PLAYING, effect->flags)) {
 445
 446                         switch (effect->effect.type) {
 447                         case FF_CONSTANT: {
 448                                 //TODO: handle envelopes
 449                                 int degrees = effect->effect.direction * 360 >> 16;
 450                                 x += fixp_mult(fixp_sin(degrees),
 451                                                fixp_new16(effect->effect.u.constant.level));
 452                                 y += fixp_mult(-fixp_cos(degrees),
 453                                                fixp_new16(effect->effect.u.constant.level));
 454                         }       break;
 455                         case FF_RUMBLE:
 456                                 right += effect->effect.u.rumble.strong_magnitude;
 457                                 left += effect->effect.u.rumble.weak_magnitude;
 458                                 break;
 459                         };
 460
 461                         /* One run of the effect is finished playing */
 462                         if (time_after(jiffies,
 463                                         effect->started_at
 464                                         + effect->effect.replay.delay*HZ/1000
 465                                         + effect->effect.replay.length*HZ/1000)) {
 466                                 dbg("Finished playing once %d", i);
 467                                 if (--effect->count <= 0) {
 468                                         dbg("Stopped %d", i);
 469                                         clear_bit(EFFECT_PLAYING, effect->flags);
 470                                 }
 471                                 else {
 472                                         dbg("Start again %d", i);
 473                                         if (effect->effect.replay.length != 0) {
 474                                                 clear_bit(EFFECT_PLAYING, effect->flags);
 475                                                 set_bit(EFFECT_STARTED, effect->flags);
 476                                         }
 477                                         effect->started_at = jiffies;
 478                                 }
 479                         }
 480
 481                 } else if (test_bit(EFFECT_STARTED, lgff->effects[i].flags)) {
 482                         /* Check if we should start playing the effect */
 483                         if (time_after(jiffies,
 484                                         lgff->effects[i].started_at
 485                                         + lgff->effects[i].effect.replay.delay*HZ/1000)) {
 486                                 dbg("Now playing %d", i);
 487                                 clear_bit(EFFECT_STARTED, lgff->effects[i].flags);
 488                                 set_bit(EFFECT_PLAYING, lgff->effects[i].flags);
 489                         }
 490                 }
 491         }
 492
 493 #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
 494
 495         // Clamp values
 496         CLAMP(x);
 497         CLAMP(y);
 498         CLAMP(left);
 499         CLAMP(right);
 500
 501 #undef CLAMP
 502
 503         if (x != lgff->constant->field[0]->value[2]
 504             || y != lgff->constant->field[0]->value[3]) {
 505                 lgff->constant->field[0]->value[2] = x;
 506                 lgff->constant->field[0]->value[3] = y;
 507                 dbg("(x,y)=(%04x, %04x)", x, y);
 508                 hid_submit_report(hid, lgff->constant, USB_DIR_OUT);
 509         }
 510
 511         if (left != lgff->rumble->field[0]->value[2]
 512             || right != lgff->rumble->field[0]->value[3]) {
 513                 lgff->rumble->field[0]->value[2] = left;
 514                 lgff->rumble->field[0]->value[3] = right;
 515                 dbg("(left,right)=(%04x, %04x)", left, right);
 516                 hid_submit_report(hid, lgff->rumble, USB_DIR_OUT);
 517         }
 518
 519         if (!test_bit(DEVICE_CLOSING, lgff->flags)) {
 520                 lgff->timer.expires = RUN_AT(PERIOD);
 521                 add_timer(&lgff->timer);
 522         }
 523
 524         spin_unlock_irqrestore(&lgff->lock, flags);
 525 }