drivers/hid/hid-roccat-pyra.c

   1 /*
   2  * Roccat Pyra driver for Linux
   3  *
   4  * Copyright (c) 2010 Stefan Achatz <erazor_de@users.sourceforge.net>
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the Free
  10  * Software Foundation; either version 2 of the License, or (at your option)
  11  * any later version.
  12  */
  13
  14 /*
  15  * Roccat Pyra is a mobile gamer mouse which comes in wired and wireless
  16  * variant. Wireless variant is not tested.
  17  * Userland tools can be found at http://sourceforge.net/projects/roccat
  18  */
  19
  20 #include <linux/device.h>
  21 #include <linux/input.h>
  22 #include <linux/hid.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/hid-roccat.h>
  26 #include "hid-ids.h"
  27 #include "hid-roccat-common.h"
  28 #include "hid-roccat-pyra.h"
  29
  30 static uint profile_numbers[5] = {0, 1, 2, 3, 4};
  31
  32 /* pyra_class is used for creating sysfs attributes via roccat char device */
  33 static struct class *pyra_class;
  34
  35 static void profile_activated(struct pyra_device *pyra,
  36                 unsigned int new_profile)
  37 {
  38         if (new_profile >= ARRAY_SIZE(pyra->profile_settings))
  39                 return;
  40         pyra->actual_profile = new_profile;
  41         pyra->actual_cpi = pyra->profile_settings[pyra->actual_profile].y_cpi;
  42 }
  43
  44 static int pyra_send_control(struct usb_device *usb_dev, int value,
  45                 enum pyra_control_requests request)
  46 {
  47         struct roccat_common2_control control;
  48
  49         if ((request == PYRA_CONTROL_REQUEST_PROFILE_SETTINGS ||
  50                         request == PYRA_CONTROL_REQUEST_PROFILE_BUTTONS) &&
  51                         (value < 0 || value > 4))
  52                 return -EINVAL;
  53
  54         control.command = ROCCAT_COMMON_COMMAND_CONTROL;
  55         control.value = value;
  56         control.request = request;
  57
  58         return roccat_common2_send(usb_dev, ROCCAT_COMMON_COMMAND_CONTROL,
  59                         &control, sizeof(struct roccat_common2_control));
  60 }
  61
  62 static int pyra_get_profile_settings(struct usb_device *usb_dev,
  63                 struct pyra_profile_settings *buf, int number)
  64 {
  65         int retval;
  66         retval = pyra_send_control(usb_dev, number,
  67                         PYRA_CONTROL_REQUEST_PROFILE_SETTINGS);
  68         if (retval)
  69                 return retval;
  70         return roccat_common2_receive(usb_dev, PYRA_COMMAND_PROFILE_SETTINGS,
  71                         buf, PYRA_SIZE_PROFILE_SETTINGS);
  72 }
  73
  74 static int pyra_get_settings(struct usb_device *usb_dev,
  75                 struct pyra_settings *buf)
  76 {
  77         return roccat_common2_receive(usb_dev, PYRA_COMMAND_SETTINGS,
  78                         buf, PYRA_SIZE_SETTINGS);
  79 }
  80
  81 static int pyra_set_settings(struct usb_device *usb_dev,
  82                 struct pyra_settings const *settings)
  83 {
  84         return roccat_common2_send_with_status(usb_dev,
  85                         PYRA_COMMAND_SETTINGS, settings,
  86                         PYRA_SIZE_SETTINGS);
  87 }
  88
  89 static ssize_t pyra_sysfs_read(struct file *fp, struct kobject *kobj,
  90                 char *buf, loff_t off, size_t count,
  91                 size_t real_size, uint command)
  92 {
  93         struct device *dev = kobj_to_dev(kobj)->parent->parent;
  94         struct pyra_device *pyra = hid_get_drvdata(dev_get_drvdata(dev));
  95         struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
  96         int retval;
  97
  98         if (off >= real_size)
  99                 return 0;
 100
 101         if (off != 0 || count != real_size)
 102                 return -EINVAL;
 103
 104         mutex_lock(&pyra->pyra_lock);
 105         retval = roccat_common2_receive(usb_dev, command, buf, real_size);
 106         mutex_unlock(&pyra->pyra_lock);
 107
 108         if (retval)
 109                 return retval;
 110
 111         return real_size;
 112 }
 113
 114 static ssize_t pyra_sysfs_write(struct file *fp, struct kobject *kobj,
 115                 void const *buf, loff_t off, size_t count,
 116                 size_t real_size, uint command)
 117 {
 118         struct device *dev = kobj_to_dev(kobj)->parent->parent;
 119         struct pyra_device *pyra = hid_get_drvdata(dev_get_drvdata(dev));
 120         struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
 121         int retval;
 122
 123         if (off != 0 || count != real_size)
 124                 return -EINVAL;
 125
 126         mutex_lock(&pyra->pyra_lock);
 127         retval = roccat_common2_send_with_status(usb_dev, command, (void *)buf, real_size);
 128         mutex_unlock(&pyra->pyra_lock);
 129
 130         if (retval)
 131                 return retval;
 132
 133         return real_size;
 134 }
 135
 136 #define PYRA_SYSFS_W(thingy, THINGY) \
 137 static ssize_t pyra_sysfs_write_ ## thingy(struct file *fp, \
 138                 struct kobject *kobj, struct bin_attribute *attr, char *buf, \
 139                 loff_t off, size_t count) \
 140 { \
 141         return pyra_sysfs_write(fp, kobj, buf, off, count, \
 142                         PYRA_SIZE_ ## THINGY, PYRA_COMMAND_ ## THINGY); \
 143 }
 144
 145 #define PYRA_SYSFS_R(thingy, THINGY) \
 146 static ssize_t pyra_sysfs_read_ ## thingy(struct file *fp, \
 147                 struct kobject *kobj, struct bin_attribute *attr, char *buf, \
 148                 loff_t off, size_t count) \
 149 { \
 150         return pyra_sysfs_read(fp, kobj, buf, off, count, \
 151                         PYRA_SIZE_ ## THINGY, PYRA_COMMAND_ ## THINGY); \
 152 }
 153
 154 #define PYRA_SYSFS_RW(thingy, THINGY) \
 155 PYRA_SYSFS_W(thingy, THINGY) \
 156 PYRA_SYSFS_R(thingy, THINGY)
 157
 158 #define PYRA_BIN_ATTRIBUTE_RW(thingy, THINGY) \
 159 PYRA_SYSFS_RW(thingy, THINGY); \
 160 static struct bin_attribute bin_attr_##thingy = { \
 161         .attr = { .name = #thingy, .mode = 0660 }, \
 162         .size = PYRA_SIZE_ ## THINGY, \
 163         .read = pyra_sysfs_read_ ## thingy, \
 164         .write = pyra_sysfs_write_ ## thingy \
 165 }
 166
 167 #define PYRA_BIN_ATTRIBUTE_R(thingy, THINGY) \
 168 PYRA_SYSFS_R(thingy, THINGY); \
 169 static struct bin_attribute bin_attr_##thingy = { \
 170         .attr = { .name = #thingy, .mode = 0440 }, \
 171         .size = PYRA_SIZE_ ## THINGY, \
 172         .read = pyra_sysfs_read_ ## thingy, \
 173 }
 174
 175 #define PYRA_BIN_ATTRIBUTE_W(thingy, THINGY) \
 176 PYRA_SYSFS_W(thingy, THINGY); \
 177 static struct bin_attribute bin_attr_##thingy = { \
 178         .attr = { .name = #thingy, .mode = 0220 }, \
 179         .size = PYRA_SIZE_ ## THINGY, \
 180         .write = pyra_sysfs_write_ ## thingy \
 181 }
 182
 183 PYRA_BIN_ATTRIBUTE_W(control, CONTROL);
 184 PYRA_BIN_ATTRIBUTE_RW(info, INFO);
 185 PYRA_BIN_ATTRIBUTE_RW(profile_settings, PROFILE_SETTINGS);
 186 PYRA_BIN_ATTRIBUTE_RW(profile_buttons, PROFILE_BUTTONS);
 187
 188 static ssize_t pyra_sysfs_read_profilex_settings(struct file *fp,
 189                 struct kobject *kobj, struct bin_attribute *attr, char *buf,
 190                 loff_t off, size_t count)
 191 {
 192         struct device *dev = kobj_to_dev(kobj)->parent->parent;
 193         struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
 194         ssize_t retval;
 195
 196         retval = pyra_send_control(usb_dev, *(uint *)(attr->private),
 197                         PYRA_CONTROL_REQUEST_PROFILE_SETTINGS);
 198         if (retval)
 199                 return retval;
 200
 201         return pyra_sysfs_read(fp, kobj, buf, off, count,
 202                         PYRA_SIZE_PROFILE_SETTINGS,
 203                         PYRA_COMMAND_PROFILE_SETTINGS);
 204 }
 205
 206 static ssize_t pyra_sysfs_read_profilex_buttons(struct file *fp,
 207                 struct kobject *kobj, struct bin_attribute *attr, char *buf,
 208                 loff_t off, size_t count)
 209 {
 210         struct device *dev = kobj_to_dev(kobj)->parent->parent;
 211         struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
 212         ssize_t retval;
 213
 214         retval = pyra_send_control(usb_dev, *(uint *)(attr->private),
 215                         PYRA_CONTROL_REQUEST_PROFILE_BUTTONS);
 216         if (retval)
 217                 return retval;
 218
 219         return pyra_sysfs_read(fp, kobj, buf, off, count,
 220                         PYRA_SIZE_PROFILE_BUTTONS,
 221                         PYRA_COMMAND_PROFILE_BUTTONS);
 222 }
 223
 224 #define PROFILE_ATTR(number)                                            \
 225 static struct bin_attribute bin_attr_profile##number##_settings = {     \
 226         .attr = { .name = "profile" #number "_settings", .mode = 0440 },        \
 227         .size = PYRA_SIZE_PROFILE_SETTINGS,                             \
 228         .read = pyra_sysfs_read_profilex_settings,                      \
 229         .private = &profile_numbers[number-1],                          \
 230 };                                                                      \
 231 static struct bin_attribute bin_attr_profile##number##_buttons = {      \
 232         .attr = { .name = "profile" #number "_buttons", .mode = 0440 }, \
 233         .size = PYRA_SIZE_PROFILE_BUTTONS,                              \
 234         .read = pyra_sysfs_read_profilex_buttons,                       \
 235         .private = &profile_numbers[number-1],                          \
 236 };
 237 PROFILE_ATTR(1);
 238 PROFILE_ATTR(2);
 239 PROFILE_ATTR(3);
 240 PROFILE_ATTR(4);
 241 PROFILE_ATTR(5);
 242
 243 static ssize_t pyra_sysfs_write_settings(struct file *fp,
 244                 struct kobject *kobj, struct bin_attribute *attr, char *buf,
 245                 loff_t off, size_t count)
 246 {
 247         struct device *dev = kobj_to_dev(kobj)->parent->parent;
 248         struct pyra_device *pyra = hid_get_drvdata(dev_get_drvdata(dev));
 249         struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
 250         int retval = 0;
 251         struct pyra_roccat_report roccat_report;
 252         struct pyra_settings const *settings;
 253
 254         if (off != 0 || count != PYRA_SIZE_SETTINGS)
 255                 return -EINVAL;
 256
 257         settings = (struct pyra_settings const *)buf;
 258         if (settings->startup_profile >= ARRAY_SIZE(pyra->profile_settings))
 259                 return -EINVAL;
 260
 261         mutex_lock(&pyra->pyra_lock);
 262
 263         retval = pyra_set_settings(usb_dev, settings);
 264         if (retval) {
 265                 mutex_unlock(&pyra->pyra_lock);
 266                 return retval;
 267         }
 268
 269         profile_activated(pyra, settings->startup_profile);
 270
 271         roccat_report.type = PYRA_MOUSE_EVENT_BUTTON_TYPE_PROFILE_2;
 272         roccat_report.value = settings->startup_profile + 1;
 273         roccat_report.key = 0;
 274         roccat_report_event(pyra->chrdev_minor,
 275                         (uint8_t const *)&roccat_report);
 276
 277         mutex_unlock(&pyra->pyra_lock);
 278         return PYRA_SIZE_SETTINGS;
 279 }
 280
 281 PYRA_SYSFS_R(settings, SETTINGS);
 282 static struct bin_attribute bin_attr_settings =
 283         __BIN_ATTR(settings, (S_IWUSR | S_IRUGO),
 284                    pyra_sysfs_read_settings, pyra_sysfs_write_settings,
 285                    PYRA_SIZE_SETTINGS);
 286
 287 static ssize_t pyra_sysfs_show_actual_cpi(struct device *dev,
 288                 struct device_attribute *attr, char *buf)
 289 {
 290         struct pyra_device *pyra =
 291                         hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
 292         return snprintf(buf, PAGE_SIZE, "%d\n", pyra->actual_cpi);
 293 }
 294 static DEVICE_ATTR(actual_cpi, 0440, pyra_sysfs_show_actual_cpi, NULL);
 295
 296 static ssize_t pyra_sysfs_show_actual_profile(struct device *dev,
 297                 struct device_attribute *attr, char *buf)
 298 {
 299         struct pyra_device *pyra =
 300                         hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
 301         struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
 302         struct pyra_settings settings;
 303
 304         mutex_lock(&pyra->pyra_lock);
 305         roccat_common2_receive(usb_dev, PYRA_COMMAND_SETTINGS,
 306                         &settings, PYRA_SIZE_SETTINGS);
 307         mutex_unlock(&pyra->pyra_lock);
 308
 309         return snprintf(buf, PAGE_SIZE, "%d\n", settings.startup_profile);
 310 }
 311 static DEVICE_ATTR(actual_profile, 0440, pyra_sysfs_show_actual_profile, NULL);
 312 static DEVICE_ATTR(startup_profile, 0440, pyra_sysfs_show_actual_profile, NULL);
 313
 314 static ssize_t pyra_sysfs_show_firmware_version(struct device *dev,
 315                 struct device_attribute *attr, char *buf)
 316 {
 317         struct pyra_device *pyra;
 318         struct usb_device *usb_dev;
 319         struct pyra_info info;
 320
 321         dev = dev->parent->parent;
 322         pyra = hid_get_drvdata(dev_get_drvdata(dev));
 323         usb_dev = interface_to_usbdev(to_usb_interface(dev));
 324
 325         mutex_lock(&pyra->pyra_lock);
 326         roccat_common2_receive(usb_dev, PYRA_COMMAND_INFO,
 327                         &info, PYRA_SIZE_INFO);
 328         mutex_unlock(&pyra->pyra_lock);
 329
 330         return snprintf(buf, PAGE_SIZE, "%d\n", info.firmware_version);
 331 }
 332 static DEVICE_ATTR(firmware_version, 0440, pyra_sysfs_show_firmware_version,
 333                    NULL);
 334
 335 static struct attribute *pyra_attrs[] = {
 336         &dev_attr_actual_cpi.attr,
 337         &dev_attr_actual_profile.attr,
 338         &dev_attr_firmware_version.attr,
 339         &dev_attr_startup_profile.attr,
 340         NULL,
 341 };
 342
 343 static struct bin_attribute *pyra_bin_attributes[] = {
 344         &bin_attr_control,
 345         &bin_attr_info,
 346         &bin_attr_profile_settings,
 347         &bin_attr_profile_buttons,
 348         &bin_attr_settings,
 349         &bin_attr_profile1_settings,
 350         &bin_attr_profile2_settings,
 351         &bin_attr_profile3_settings,
 352         &bin_attr_profile4_settings,
 353         &bin_attr_profile5_settings,
 354         &bin_attr_profile1_buttons,
 355         &bin_attr_profile2_buttons,
 356         &bin_attr_profile3_buttons,
 357         &bin_attr_profile4_buttons,
 358         &bin_attr_profile5_buttons,
 359         NULL,
 360 };
 361
 362 static const struct attribute_group pyra_group = {
 363         .attrs = pyra_attrs,
 364         .bin_attrs = pyra_bin_attributes,
 365 };
 366
 367 static const struct attribute_group *pyra_groups[] = {
 368         &pyra_group,
 369         NULL,
 370 };
 371
 372 static int pyra_init_pyra_device_struct(struct usb_device *usb_dev,
 373                 struct pyra_device *pyra)
 374 {
 375         struct pyra_settings settings;
 376         int retval, i;
 377
 378         mutex_init(&pyra->pyra_lock);
 379
 380         retval = pyra_get_settings(usb_dev, &settings);
 381         if (retval)
 382                 return retval;
 383
 384         for (i = 0; i < 5; ++i) {
 385                 retval = pyra_get_profile_settings(usb_dev,
 386                                 &pyra->profile_settings[i], i);
 387                 if (retval)
 388                         return retval;
 389         }
 390
 391         profile_activated(pyra, settings.startup_profile);
 392
 393         return 0;
 394 }
 395
 396 static int pyra_init_specials(struct hid_device *hdev)
 397 {
 398         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
 399         struct usb_device *usb_dev = interface_to_usbdev(intf);
 400         struct pyra_device *pyra;
 401         int retval;
 402
 403         if (intf->cur_altsetting->desc.bInterfaceProtocol
 404                         == USB_INTERFACE_PROTOCOL_MOUSE) {
 405
 406                 pyra = kzalloc(sizeof(*pyra), GFP_KERNEL);
 407                 if (!pyra) {
 408                         hid_err(hdev, "can't alloc device descriptor\n");
 409                         return -ENOMEM;
 410                 }
 411                 hid_set_drvdata(hdev, pyra);
 412
 413                 retval = pyra_init_pyra_device_struct(usb_dev, pyra);
 414                 if (retval) {
 415                         hid_err(hdev, "couldn't init struct pyra_device\n");
 416                         goto exit_free;
 417                 }
 418
 419                 retval = roccat_connect(pyra_class, hdev,
 420                                 sizeof(struct pyra_roccat_report));
 421                 if (retval < 0) {
 422                         hid_err(hdev, "couldn't init char dev\n");
 423                 } else {
 424                         pyra->chrdev_minor = retval;
 425                         pyra->roccat_claimed = 1;
 426                 }
 427         } else {
 428                 hid_set_drvdata(hdev, NULL);
 429         }
 430
 431         return 0;
 432 exit_free:
 433         kfree(pyra);
 434         return retval;
 435 }
 436
 437 static void pyra_remove_specials(struct hid_device *hdev)
 438 {
 439         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
 440         struct pyra_device *pyra;
 441
 442         if (intf->cur_altsetting->desc.bInterfaceProtocol
 443                         == USB_INTERFACE_PROTOCOL_MOUSE) {
 444                 pyra = hid_get_drvdata(hdev);
 445                 if (pyra->roccat_claimed)
 446                         roccat_disconnect(pyra->chrdev_minor);
 447                 kfree(hid_get_drvdata(hdev));
 448         }
 449 }
 450
 451 static int pyra_probe(struct hid_device *hdev, const struct hid_device_id *id)
 452 {
 453         int retval;
 454
 455         retval = hid_parse(hdev);
 456         if (retval) {
 457                 hid_err(hdev, "parse failed\n");
 458                 goto exit;
 459         }
 460
 461         retval = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 462         if (retval) {
 463                 hid_err(hdev, "hw start failed\n");
 464                 goto exit;
 465         }
 466
 467         retval = pyra_init_specials(hdev);
 468         if (retval) {
 469                 hid_err(hdev, "couldn't install mouse\n");
 470                 goto exit_stop;
 471         }
 472         return 0;
 473
 474 exit_stop:
 475         hid_hw_stop(hdev);
 476 exit:
 477         return retval;
 478 }
 479
 480 static void pyra_remove(struct hid_device *hdev)
 481 {
 482         pyra_remove_specials(hdev);
 483         hid_hw_stop(hdev);
 484 }
 485
 486 static void pyra_keep_values_up_to_date(struct pyra_device *pyra,
 487                 u8 const *data)
 488 {
 489         struct pyra_mouse_event_button const *button_event;
 490
 491         switch (data[0]) {
 492         case PYRA_MOUSE_REPORT_NUMBER_BUTTON:
 493                 button_event = (struct pyra_mouse_event_button const *)data;
 494                 switch (button_event->type) {
 495                 case PYRA_MOUSE_EVENT_BUTTON_TYPE_PROFILE_2:
 496                         profile_activated(pyra, button_event->data1 - 1);
 497                         break;
 498                 case PYRA_MOUSE_EVENT_BUTTON_TYPE_CPI:
 499                         pyra->actual_cpi = button_event->data1;
 500                         break;
 501                 }
 502                 break;
 503         }
 504 }
 505
 506 static void pyra_report_to_chrdev(struct pyra_device const *pyra,
 507                 u8 const *data)
 508 {
 509         struct pyra_roccat_report roccat_report;
 510         struct pyra_mouse_event_button const *button_event;
 511
 512         if (data[0] != PYRA_MOUSE_REPORT_NUMBER_BUTTON)
 513                 return;
 514
 515         button_event = (struct pyra_mouse_event_button const *)data;
 516
 517         switch (button_event->type) {
 518         case PYRA_MOUSE_EVENT_BUTTON_TYPE_PROFILE_2:
 519         case PYRA_MOUSE_EVENT_BUTTON_TYPE_CPI:
 520                 roccat_report.type = button_event->type;
 521                 roccat_report.value = button_event->data1;
 522                 roccat_report.key = 0;
 523                 roccat_report_event(pyra->chrdev_minor,
 524                                 (uint8_t const *)&roccat_report);
 525                 break;
 526         case PYRA_MOUSE_EVENT_BUTTON_TYPE_MACRO:
 527         case PYRA_MOUSE_EVENT_BUTTON_TYPE_SHORTCUT:
 528         case PYRA_MOUSE_EVENT_BUTTON_TYPE_QUICKLAUNCH:
 529                 if (button_event->data2 == PYRA_MOUSE_EVENT_BUTTON_PRESS) {
 530                         roccat_report.type = button_event->type;
 531                         roccat_report.key = button_event->data1;
 532                         /*
 533                          * pyra reports profile numbers with range 1-5.
 534                          * Keeping this behaviour.
 535                          */
 536                         roccat_report.value = pyra->actual_profile + 1;
 537                         roccat_report_event(pyra->chrdev_minor,
 538                                         (uint8_t const *)&roccat_report);
 539                 }
 540                 break;
 541         }
 542 }
 543
 544 static int pyra_raw_event(struct hid_device *hdev, struct hid_report *report,
 545                 u8 *data, int size)
 546 {
 547         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
 548         struct pyra_device *pyra = hid_get_drvdata(hdev);
 549
 550         if (intf->cur_altsetting->desc.bInterfaceProtocol
 551                         != USB_INTERFACE_PROTOCOL_MOUSE)
 552                 return 0;
 553
 554         if (pyra == NULL)
 555                 return 0;
 556
 557         pyra_keep_values_up_to_date(pyra, data);
 558
 559         if (pyra->roccat_claimed)
 560                 pyra_report_to_chrdev(pyra, data);
 561
 562         return 0;
 563 }
 564
 565 static const struct hid_device_id pyra_devices[] = {
 566         { HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT,
 567                         USB_DEVICE_ID_ROCCAT_PYRA_WIRED) },
 568         { HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT,
 569                         USB_DEVICE_ID_ROCCAT_PYRA_WIRELESS) },
 570         { }
 571 };
 572
 573 MODULE_DEVICE_TABLE(hid, pyra_devices);
 574
 575 static struct hid_driver pyra_driver = {
 576                 .name = "pyra",
 577                 .id_table = pyra_devices,
 578                 .probe = pyra_probe,
 579                 .remove = pyra_remove,
 580                 .raw_event = pyra_raw_event
 581 };
 582
 583 static int __init pyra_init(void)
 584 {
 585         int retval;
 586
 587         /* class name has to be same as driver name */
 588         pyra_class = class_create(THIS_MODULE, "pyra");
 589         if (IS_ERR(pyra_class))
 590                 return PTR_ERR(pyra_class);
 591         pyra_class->dev_groups = pyra_groups;
 592
 593         retval = hid_register_driver(&pyra_driver);
 594         if (retval)
 595                 class_destroy(pyra_class);
 596         return retval;
 597 }
 598
 599 static void __exit pyra_exit(void)
 600 {
 601         hid_unregister_driver(&pyra_driver);
 602         class_destroy(pyra_class);
 603 }
 604
 605 module_init(pyra_init);
 606 module_exit(pyra_exit);
 607
 608 MODULE_AUTHOR("Stefan Achatz");
 609 MODULE_DESCRIPTION("USB Roccat Pyra driver");
 610 MODULE_LICENSE("GPL v2");