drivers/hid/hid-lg4ff.c

   1 /*
   2  *  Force feedback support for Logitech Gaming Wheels
   3  *
   4  *  Including G27, G25, DFP, DFGT, FFEX, Momo, Momo2 &
   5  *  Speed Force Wireless (WiiWheel)
   6  *
   7  *  Copyright (c) 2010 Simon Wood <simon@mungewell.org>
   8  */
   9
  10 /*
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26
  27 #include <linux/input.h>
  28 #include <linux/usb.h>
  29 #include <linux/hid.h>
  30
  31 #include "usbhid/usbhid.h"
  32 #include "hid-lg.h"
  33 #include "hid-ids.h"
  34
  35 #define DFGT_REV_MAJ 0x13
  36 #define DFGT_REV_MIN 0x22
  37 #define DFP_REV_MAJ 0x11
  38 #define DFP_REV_MIN 0x06
  39 #define FFEX_REV_MAJ 0x21
  40 #define FFEX_REV_MIN 0x00
  41 #define G25_REV_MAJ 0x12
  42 #define G25_REV_MIN 0x22
  43 #define G27_REV_MAJ 0x12
  44 #define G27_REV_MIN 0x38
  45
  46 #define DFP_X_MIN 0
  47 #define DFP_X_MAX 16383
  48 #define DFP_PEDAL_MIN 0
  49 #define DFP_PEDAL_MAX 255
  50
  51 #define to_hid_device(pdev) container_of(pdev, struct hid_device, dev)
  52
  53 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
  54 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range);
  55 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf);
  56 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);
  57
  58 static DEVICE_ATTR(range, S_IRWXU | S_IRWXG | S_IRWXO, lg4ff_range_show, lg4ff_range_store);
  59
  60 struct lg4ff_device_entry {
  61         __u32 product_id;
  62         __u16 range;
  63         __u16 min_range;
  64         __u16 max_range;
  65 #ifdef CONFIG_LEDS_CLASS
  66         __u8  led_state;
  67         struct led_classdev *led[5];
  68 #endif
  69         struct list_head list;
  70         void (*set_range)(struct hid_device *hid, u16 range);
  71 };
  72
  73 static const signed short lg4ff_wheel_effects[] = {
  74         FF_CONSTANT,
  75         FF_AUTOCENTER,
  76         -1
  77 };
  78
  79 struct lg4ff_wheel {
  80         const __u32 product_id;
  81         const signed short *ff_effects;
  82         const __u16 min_range;
  83         const __u16 max_range;
  84         void (*set_range)(struct hid_device *hid, u16 range);
  85 };
  86
  87 static const struct lg4ff_wheel lg4ff_devices[] = {
  88         {USB_DEVICE_ID_LOGITECH_WHEEL,       lg4ff_wheel_effects, 40, 270, NULL},
  89         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL,  lg4ff_wheel_effects, 40, 270, NULL},
  90         {USB_DEVICE_ID_LOGITECH_DFP_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_dfp},
  91         {USB_DEVICE_ID_LOGITECH_G25_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  92         {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,  lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  93         {USB_DEVICE_ID_LOGITECH_G27_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  94         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270, NULL},
  95         {USB_DEVICE_ID_LOGITECH_WII_WHEEL,   lg4ff_wheel_effects, 40, 270, NULL}
  96 };
  97
  98 struct lg4ff_native_cmd {
  99         const __u8 cmd_num;     /* Number of commands to send */
 100         const __u8 cmd[];
 101 };
 102
 103 struct lg4ff_usb_revision {
 104         const __u16 rev_maj;
 105         const __u16 rev_min;
 106         const struct lg4ff_native_cmd *command;
 107 };
 108
 109 static const struct lg4ff_native_cmd native_dfp = {
 110         1,
 111         {0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
 112 };
 113
 114 static const struct lg4ff_native_cmd native_dfgt = {
 115         2,
 116         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* 1st command */
 117          0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00}      /* 2nd command */
 118 };
 119
 120 static const struct lg4ff_native_cmd native_g25 = {
 121         1,
 122         {0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
 123 };
 124
 125 static const struct lg4ff_native_cmd native_g27 = {
 126         2,
 127         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* 1st command */
 128          0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00}      /* 2nd command */
 129 };
 130
 131 static const struct lg4ff_usb_revision lg4ff_revs[] = {
 132         {DFGT_REV_MAJ, DFGT_REV_MIN, &native_dfgt},     /* Driving Force GT */
 133         {DFP_REV_MAJ,  DFP_REV_MIN,  &native_dfp},      /* Driving Force Pro */
 134         {G25_REV_MAJ,  G25_REV_MIN,  &native_g25},      /* G25 */
 135         {G27_REV_MAJ,  G27_REV_MIN,  &native_g27},      /* G27 */
 136 };
 137
 138 /* Recalculates X axis value accordingly to currently selected range */
 139 static __s32 lg4ff_adjust_dfp_x_axis(__s32 value, __u16 range)
 140 {
 141         __u16 max_range;
 142         __s32 new_value;
 143
 144         if (range == 900)
 145                 return value;
 146         else if (range == 200)
 147                 return value;
 148         else if (range < 200)
 149                 max_range = 200;
 150         else
 151                 max_range = 900;
 152
 153         new_value = 8192 + mult_frac(value - 8192, max_range, range);
 154         if (new_value < 0)
 155                 return 0;
 156         else if (new_value > 16383)
 157                 return 16383;
 158         else
 159                 return new_value;
 160 }
 161
 162 int lg4ff_adjust_input_event(struct hid_device *hid, struct hid_field *field,
 163                              struct hid_usage *usage, __s32 value, struct lg_drv_data *drv_data)
 164 {
 165         struct lg4ff_device_entry *entry = drv_data->device_props;
 166         __s32 new_value = 0;
 167
 168         if (!entry) {
 169                 hid_err(hid, "Device properties not found");
 170                 return 0;
 171         }
 172
 173         switch (entry->product_id) {
 174         case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 175                 switch (usage->code) {
 176                 case ABS_X:
 177                         new_value = lg4ff_adjust_dfp_x_axis(value, entry->range);
 178                         input_event(field->hidinput->input, usage->type, usage->code, new_value);
 179                         return 1;
 180                 default:
 181                         return 0;
 182                 }
 183         default:
 184                 return 0;
 185         }
 186 }
 187
 188 static int hid_lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
 189 {
 190         struct hid_device *hid = input_get_drvdata(dev);
 191         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 192         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 193         __s32 *value = report->field[0]->value;
 194         int x;
 195
 196 #define CLAMP(x) do { if (x < 0) x = 0; else if (x > 0xff) x = 0xff; } while (0)
 197
 198         switch (effect->type) {
 199         case FF_CONSTANT:
 200                 x = effect->u.ramp.start_level + 0x80;  /* 0x80 is no force */
 201                 CLAMP(x);
 202                 value[0] = 0x11;        /* Slot 1 */
 203                 value[1] = 0x08;
 204                 value[2] = x;
 205                 value[3] = 0x80;
 206                 value[4] = 0x00;
 207                 value[5] = 0x00;
 208                 value[6] = 0x00;
 209
 210                 usbhid_submit_report(hid, report, USB_DIR_OUT);
 211                 break;
 212         }
 213         return 0;
 214 }
 215
 216 /* Sends default autocentering command compatible with
 217  * all wheels except Formula Force EX */
 218 static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 219 {
 220         struct hid_device *hid = input_get_drvdata(dev);
 221         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 222         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 223         __s32 *value = report->field[0]->value;
 224
 225         value[0] = 0xfe;
 226         value[1] = 0x0d;
 227         value[2] = magnitude >> 13;
 228         value[3] = magnitude >> 13;
 229         value[4] = magnitude >> 8;
 230         value[5] = 0x00;
 231         value[6] = 0x00;
 232
 233         usbhid_submit_report(hid, report, USB_DIR_OUT);
 234 }
 235
 236 /* Sends autocentering command compatible with Formula Force EX */
 237 static void hid_lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
 238 {
 239         struct hid_device *hid = input_get_drvdata(dev);
 240         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 241         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 242         __s32 *value = report->field[0]->value;
 243         magnitude = magnitude * 90 / 65535;
 244
 245         value[0] = 0xfe;
 246         value[1] = 0x03;
 247         value[2] = magnitude >> 14;
 248         value[3] = magnitude >> 14;
 249         value[4] = magnitude;
 250         value[5] = 0x00;
 251         value[6] = 0x00;
 252
 253         usbhid_submit_report(hid, report, USB_DIR_OUT);
 254 }
 255
 256 /* Sends command to set range compatible with G25/G27/Driving Force GT */
 257 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 258 {
 259         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 260         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 261         __s32 *value = report->field[0]->value;
 262
 263         dbg_hid("G25/G27/DFGT: setting range to %u\n", range);
 264
 265         value[0] = 0xf8;
 266         value[1] = 0x81;
 267         value[2] = range & 0x00ff;
 268         value[3] = (range & 0xff00) >> 8;
 269         value[4] = 0x00;
 270         value[5] = 0x00;
 271         value[6] = 0x00;
 272
 273         usbhid_submit_report(hid, report, USB_DIR_OUT);
 274 }
 275
 276 /* Sends commands to set range compatible with Driving Force Pro wheel */
 277 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range)
 278 {
 279         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 280         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 281         int start_left, start_right, full_range;
 282         __s32 *value = report->field[0]->value;
 283
 284         dbg_hid("Driving Force Pro: setting range to %u\n", range);
 285
 286         /* Prepare "coarse" limit command */
 287         value[0] = 0xf8;
 288         value[1] = 0x00;        /* Set later */
 289         value[2] = 0x00;
 290         value[3] = 0x00;
 291         value[4] = 0x00;
 292         value[5] = 0x00;
 293         value[6] = 0x00;
 294
 295         if (range > 200) {
 296                 report->field[0]->value[1] = 0x03;
 297                 full_range = 900;
 298         } else {
 299                 report->field[0]->value[1] = 0x02;
 300                 full_range = 200;
 301         }
 302         usbhid_submit_report(hid, report, USB_DIR_OUT);
 303
 304         /* Prepare "fine" limit command */
 305         value[0] = 0x81;
 306         value[1] = 0x0b;
 307         value[2] = 0x00;
 308         value[3] = 0x00;
 309         value[4] = 0x00;
 310         value[5] = 0x00;
 311         value[6] = 0x00;
 312
 313         if (range == 200 || range == 900) {     /* Do not apply any fine limit */
 314                 usbhid_submit_report(hid, report, USB_DIR_OUT);
 315                 return;
 316         }
 317
 318         /* Construct fine limit command */
 319         start_left = (((full_range - range + 1) * 2047) / full_range);
 320         start_right = 0xfff - start_left;
 321
 322         value[2] = start_left >> 4;
 323         value[3] = start_right >> 4;
 324         value[4] = 0xff;
 325         value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
 326         value[6] = 0xff;
 327
 328         usbhid_submit_report(hid, report, USB_DIR_OUT);
 329 }
 330
 331 static void hid_lg4ff_switch_native(struct hid_device *hid, const struct lg4ff_native_cmd *cmd)
 332 {
 333         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 334         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 335         __u8 i, j;
 336
 337         j = 0;
 338         while (j < 7*cmd->cmd_num) {
 339                 for (i = 0; i < 7; i++)
 340                         report->field[0]->value[i] = cmd->cmd[j++];
 341
 342                 usbhid_submit_report(hid, report, USB_DIR_OUT);
 343         }
 344 }
 345
 346 /* Read current range and display it in terminal */
 347 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf)
 348 {
 349         struct hid_device *hid = to_hid_device(dev);
 350         struct lg4ff_device_entry *entry;
 351         struct lg_drv_data *drv_data;
 352         size_t count;
 353
 354         drv_data = hid_get_drvdata(hid);
 355         if (!drv_data) {
 356                 hid_err(hid, "Private driver data not found!\n");
 357                 return 0;
 358         }
 359
 360         entry = drv_data->device_props;
 361         if (!entry) {
 362                 hid_err(hid, "Device properties not found!\n");
 363                 return 0;
 364         }
 365
 366         count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->range);
 367         return count;
 368 }
 369
 370 /* Set range to user specified value, call appropriate function
 371  * according to the type of the wheel */
 372 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 373 {
 374         struct hid_device *hid = to_hid_device(dev);
 375         struct lg4ff_device_entry *entry;
 376         struct lg_drv_data *drv_data;
 377         __u16 range = simple_strtoul(buf, NULL, 10);
 378
 379         drv_data = hid_get_drvdata(hid);
 380         if (!drv_data) {
 381                 hid_err(hid, "Private driver data not found!\n");
 382                 return 0;
 383         }
 384
 385         entry = drv_data->device_props;
 386         if (!entry) {
 387                 hid_err(hid, "Device properties not found!\n");
 388                 return 0;
 389         }
 390
 391         if (range == 0)
 392                 range = entry->max_range;
 393
 394         /* Check if the wheel supports range setting
 395          * and that the range is within limits for the wheel */
 396         if (entry->set_range != NULL && range >= entry->min_range && range <= entry->max_range) {
 397                 entry->set_range(hid, range);
 398                 entry->range = range;
 399         }
 400
 401         return count;
 402 }
 403
 404 #ifdef CONFIG_LEDS_CLASS
 405 static void lg4ff_set_leds(struct hid_device *hid, __u8 leds)
 406 {
 407         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 408         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 409         __s32 *value = report->field[0]->value;
 410
 411         value[0] = 0xf8;
 412         value[1] = 0x12;
 413         value[2] = leds;
 414         value[3] = 0x00;
 415         value[4] = 0x00;
 416         value[5] = 0x00;
 417         value[6] = 0x00;
 418         usbhid_submit_report(hid, report, USB_DIR_OUT);
 419 }
 420
 421 static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
 422                         enum led_brightness value)
 423 {
 424         struct device *dev = led_cdev->dev->parent;
 425         struct hid_device *hid = container_of(dev, struct hid_device, dev);
 426         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
 427         struct lg4ff_device_entry *entry;
 428         int i, state = 0;
 429
 430         if (!drv_data) {
 431                 hid_err(hid, "Device data not found.");
 432                 return;
 433         }
 434
 435         entry = (struct lg4ff_device_entry *)drv_data->device_props;
 436
 437         if (!entry) {
 438                 hid_err(hid, "Device properties not found.");
 439                 return;
 440         }
 441
 442         for (i = 0; i < 5; i++) {
 443                 if (led_cdev != entry->led[i])
 444                         continue;
 445                 state = (entry->led_state >> i) & 1;
 446                 if (value == LED_OFF && state) {
 447                         entry->led_state &= ~(1 << i);
 448                         lg4ff_set_leds(hid, entry->led_state);
 449                 } else if (value != LED_OFF && !state) {
 450                         entry->led_state |= 1 << i;
 451                         lg4ff_set_leds(hid, entry->led_state);
 452                 }
 453                 break;
 454         }
 455 }
 456
 457 static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
 458 {
 459         struct device *dev = led_cdev->dev->parent;
 460         struct hid_device *hid = container_of(dev, struct hid_device, dev);
 461         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
 462         struct lg4ff_device_entry *entry;
 463         int i, value = 0;
 464
 465         if (!drv_data) {
 466                 hid_err(hid, "Device data not found.");
 467                 return LED_OFF;
 468         }
 469
 470         entry = (struct lg4ff_device_entry *)drv_data->device_props;
 471
 472         if (!entry) {
 473                 hid_err(hid, "Device properties not found.");
 474                 return LED_OFF;
 475         }
 476
 477         for (i = 0; i < 5; i++)
 478                 if (led_cdev == entry->led[i]) {
 479                         value = (entry->led_state >> i) & 1;
 480                         break;
 481                 }
 482
 483         return value ? LED_FULL : LED_OFF;
 484 }
 485 #endif
 486
 487 int lg4ff_init(struct hid_device *hid)
 488 {
 489         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 490         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 491         struct input_dev *dev = hidinput->input;
 492         struct hid_report *report;
 493         struct hid_field *field;
 494         struct lg4ff_device_entry *entry;
 495         struct lg_drv_data *drv_data;
 496         struct usb_device_descriptor *udesc;
 497         int error, i, j;
 498         __u16 bcdDevice, rev_maj, rev_min;
 499
 500         /* Find the report to use */
 501         if (list_empty(report_list)) {
 502                 hid_err(hid, "No output report found\n");
 503                 return -1;
 504         }
 505
 506         /* Check that the report looks ok */
 507         report = list_entry(report_list->next, struct hid_report, list);
 508         if (!report) {
 509                 hid_err(hid, "NULL output report\n");
 510                 return -1;
 511         }
 512
 513         field = report->field[0];
 514         if (!field) {
 515                 hid_err(hid, "NULL field\n");
 516                 return -1;
 517         }
 518
 519         /* Check what wheel has been connected */
 520         for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
 521                 if (hid->product == lg4ff_devices[i].product_id) {
 522                         dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
 523                         break;
 524                 }
 525         }
 526
 527         if (i == ARRAY_SIZE(lg4ff_devices)) {
 528                 hid_err(hid, "Device is not supported by lg4ff driver. If you think it should be, consider reporting a bug to"
 529                              "LKML, Simon Wood <simon@mungewell.org> or Michal Maly <madcatxster@gmail.com>\n");
 530                 return -1;
 531         }
 532
 533         /* Attempt to switch wheel to native mode when applicable */
 534         udesc = &(hid_to_usb_dev(hid)->descriptor);
 535         if (!udesc) {
 536                 hid_err(hid, "NULL USB device descriptor\n");
 537                 return -1;
 538         }
 539         bcdDevice = le16_to_cpu(udesc->bcdDevice);
 540         rev_maj = bcdDevice >> 8;
 541         rev_min = bcdDevice & 0xff;
 542
 543         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_WHEEL) {
 544                 dbg_hid("Generic wheel detected, can it do native?\n");
 545                 dbg_hid("USB revision: %2x.%02x\n", rev_maj, rev_min);
 546
 547                 for (j = 0; j < ARRAY_SIZE(lg4ff_revs); j++) {
 548                         if (lg4ff_revs[j].rev_maj == rev_maj && lg4ff_revs[j].rev_min == rev_min) {
 549                                 hid_lg4ff_switch_native(hid, lg4ff_revs[j].command);
 550                                 hid_info(hid, "Switched to native mode\n");
 551                         }
 552                 }
 553         }
 554
 555         /* Set supported force feedback capabilities */
 556         for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
 557                 set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);
 558
 559         error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);
 560
 561         if (error)
 562                 return error;
 563
 564         /* Check if autocentering is available and
 565          * set the centering force to zero by default */
 566         if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
 567                 if (rev_maj == FFEX_REV_MAJ && rev_min == FFEX_REV_MIN) /* Formula Force EX expects different autocentering command */
 568                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_ffex;
 569                 else
 570                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_default;
 571
 572                 dev->ff->set_autocenter(dev, 0);
 573         }
 574
 575         /* Get private driver data */
 576         drv_data = hid_get_drvdata(hid);
 577         if (!drv_data) {
 578                 hid_err(hid, "Cannot add device, private driver data not allocated\n");
 579                 return -1;
 580         }
 581
 582         /* Initialize device properties */
 583         entry = kzalloc(sizeof(struct lg4ff_device_entry), GFP_KERNEL);
 584         if (!entry) {
 585                 hid_err(hid, "Cannot add device, insufficient memory to allocate device properties.\n");
 586                 return -ENOMEM;
 587         }
 588         drv_data->device_props = entry;
 589
 590         entry->product_id = lg4ff_devices[i].product_id;
 591         entry->min_range = lg4ff_devices[i].min_range;
 592         entry->max_range = lg4ff_devices[i].max_range;
 593         entry->set_range = lg4ff_devices[i].set_range;
 594
 595         /* Create sysfs interface */
 596         error = device_create_file(&hid->dev, &dev_attr_range);
 597         if (error)
 598                 return error;
 599         dbg_hid("sysfs interface created\n");
 600
 601         /* Set default axes parameters */
 602         switch (lg4ff_devices[i].product_id) {
 603         case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 604                 dbg_hid("Setting axes parameters for Driving Force Pro\n");
 605                 input_set_abs_params(dev, ABS_X, DFP_X_MIN, DFP_X_MAX, 0, 0);
 606                 input_set_abs_params(dev, ABS_Y, DFP_PEDAL_MIN, DFP_PEDAL_MAX, 0, 0);
 607                 input_set_abs_params(dev, ABS_RZ, DFP_PEDAL_MIN, DFP_PEDAL_MAX, 0, 0);
 608                 break;
 609         default:
 610                 break;
 611         }
 612
 613         /* Set the maximum range to start with */
 614         entry->range = entry->max_range;
 615         if (entry->set_range != NULL)
 616                 entry->set_range(hid, entry->range);
 617
 618 #ifdef CONFIG_LEDS_CLASS
 619         /* register led subsystem - G27 only */
 620         entry->led_state = 0;
 621         for (j = 0; j < 5; j++)
 622                 entry->led[j] = NULL;
 623
 624         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {
 625                 struct led_classdev *led;
 626                 size_t name_sz;
 627                 char *name;
 628
 629                 lg4ff_set_leds(hid, 0);
 630
 631                 name_sz = strlen(dev_name(&hid->dev)) + 8;
 632
 633                 for (j = 0; j < 5; j++) {
 634                         led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
 635                         if (!led) {
 636                                 hid_err(hid, "can't allocate memory for LED %d\n", j);
 637                                 goto err;
 638                         }
 639
 640                         name = (void *)(&led[1]);
 641                         snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
 642                         led->name = name;
 643                         led->brightness = 0;
 644                         led->max_brightness = 1;
 645                         led->brightness_get = lg4ff_led_get_brightness;
 646                         led->brightness_set = lg4ff_led_set_brightness;
 647
 648                         entry->led[j] = led;
 649                         error = led_classdev_register(&hid->dev, led);
 650
 651                         if (error) {
 652                                 hid_err(hid, "failed to register LED %d. Aborting.\n", j);
 653 err:
 654                                 /* Deregister LEDs (if any) */
 655                                 for (j = 0; j < 5; j++) {
 656                                         led = entry->led[j];
 657                                         entry->led[j] = NULL;
 658                                         if (!led)
 659                                                 continue;
 660                                         led_classdev_unregister(led);
 661                                         kfree(led);
 662                                 }
 663                                 goto out;       /* Let the driver continue without LEDs */
 664                         }
 665                 }
 666         }
 667 out:
 668 #endif
 669         hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
 670         return 0;
 671 }
 672
 673
 674
 675 int lg4ff_deinit(struct hid_device *hid)
 676 {
 677         struct lg4ff_device_entry *entry;
 678         struct lg_drv_data *drv_data;
 679
 680         device_remove_file(&hid->dev, &dev_attr_range);
 681
 682         drv_data = hid_get_drvdata(hid);
 683         if (!drv_data) {
 684                 hid_err(hid, "Error while deinitializing device, no private driver data.\n");
 685                 return -1;
 686         }
 687         entry = drv_data->device_props;
 688         if (!entry) {
 689                 hid_err(hid, "Error while deinitializing device, no device properties data.\n");
 690                 return -1;
 691         }
 692
 693 #ifdef CONFIG_LEDS_CLASS
 694         {
 695                 int j;
 696                 struct led_classdev *led;
 697
 698                 /* Deregister LEDs (if any) */
 699                 for (j = 0; j < 5; j++) {
 700
 701                         led = entry->led[j];
 702                         entry->led[j] = NULL;
 703                         if (!led)
 704                                 continue;
 705                         led_classdev_unregister(led);
 706                         kfree(led);
 707                 }
 708         }
 709 #endif
 710
 711         /* Deallocate memory */
 712         kfree(entry);
 713
 714         dbg_hid("Device successfully unregistered\n");
 715         return 0;
 716 }