1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * cros_ec_dev - expose the Chrome OS Embedded Controller to user-space 4 * 5 * Copyright (C) 2014 Google, Inc. 6 */ 7 8 #include <linux/fs.h> 9 #include <linux/mfd/core.h> 10 #include <linux/module.h> 11 #include <linux/mod_devicetable.h> 12 #include <linux/of_platform.h> 13 #include <linux/platform_device.h> 14 #include <linux/pm.h> 15 #include <linux/slab.h> 16 #include <linux/uaccess.h> 17 18 #include "cros_ec_dev.h" 19 20 #define DRV_NAME "cros-ec-dev" 21 22 /* Device variables */ 23 #define CROS_MAX_DEV 128 24 static int ec_major; 25 26 static struct class cros_class = { 27 .owner = THIS_MODULE, 28 .name = "chromeos", 29 }; 30 31 /* Basic communication */ 32 static int ec_get_version(struct cros_ec_dev *ec, char *str, int maxlen) 33 { 34 struct ec_response_get_version *resp; 35 static const char * const current_image_name[] = { 36 "unknown", "read-only", "read-write", "invalid", 37 }; 38 struct cros_ec_command *msg; 39 int ret; 40 41 msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL); 42 if (!msg) 43 return -ENOMEM; 44 45 msg->version = 0; 46 msg->command = EC_CMD_GET_VERSION + ec->cmd_offset; 47 msg->insize = sizeof(*resp); 48 msg->outsize = 0; 49 50 ret = cros_ec_cmd_xfer(ec->ec_dev, msg); 51 if (ret < 0) 52 goto exit; 53 54 if (msg->result != EC_RES_SUCCESS) { 55 snprintf(str, maxlen, 56 "%s\nUnknown EC version: EC returned %d\n", 57 CROS_EC_DEV_VERSION, msg->result); 58 ret = -EINVAL; 59 goto exit; 60 } 61 62 resp = (struct ec_response_get_version *)msg->data; 63 if (resp->current_image >= ARRAY_SIZE(current_image_name)) 64 resp->current_image = 3; /* invalid */ 65 66 snprintf(str, maxlen, "%s\n%s\n%s\n%s\n", CROS_EC_DEV_VERSION, 67 resp->version_string_ro, resp->version_string_rw, 68 current_image_name[resp->current_image]); 69 70 ret = 0; 71 exit: 72 kfree(msg); 73 return ret; 74 } 75 76 static int cros_ec_check_features(struct cros_ec_dev *ec, int feature) 77 { 78 struct cros_ec_command *msg; 79 int ret; 80 81 if (ec->features[0] == -1U && ec->features[1] == -1U) { 82 /* features bitmap not read yet */ 83 84 msg = kmalloc(sizeof(*msg) + sizeof(ec->features), GFP_KERNEL); 85 if (!msg) 86 return -ENOMEM; 87 88 msg->version = 0; 89 msg->command = EC_CMD_GET_FEATURES + ec->cmd_offset; 90 msg->insize = sizeof(ec->features); 91 msg->outsize = 0; 92 93 ret = cros_ec_cmd_xfer(ec->ec_dev, msg); 94 if (ret < 0 || msg->result != EC_RES_SUCCESS) { 95 dev_warn(ec->dev, "cannot get EC features: %d/%d\n", 96 ret, msg->result); 97 memset(ec->features, 0, sizeof(ec->features)); 98 } else { 99 memcpy(ec->features, msg->data, sizeof(ec->features)); 100 } 101 102 dev_dbg(ec->dev, "EC features %08x %08x\n", 103 ec->features[0], ec->features[1]); 104 105 kfree(msg); 106 } 107 108 return ec->features[feature / 32] & EC_FEATURE_MASK_0(feature); 109 } 110 111 /* Device file ops */ 112 static int ec_device_open(struct inode *inode, struct file *filp) 113 { 114 struct cros_ec_dev *ec = container_of(inode->i_cdev, 115 struct cros_ec_dev, cdev); 116 filp->private_data = ec; 117 nonseekable_open(inode, filp); 118 return 0; 119 } 120 121 static int ec_device_release(struct inode *inode, struct file *filp) 122 { 123 return 0; 124 } 125 126 static ssize_t ec_device_read(struct file *filp, char __user *buffer, 127 size_t length, loff_t *offset) 128 { 129 struct cros_ec_dev *ec = filp->private_data; 130 char msg[sizeof(struct ec_response_get_version) + 131 sizeof(CROS_EC_DEV_VERSION)]; 132 size_t count; 133 int ret; 134 135 if (*offset != 0) 136 return 0; 137 138 ret = ec_get_version(ec, msg, sizeof(msg)); 139 if (ret) 140 return ret; 141 142 count = min(length, strlen(msg)); 143 144 if (copy_to_user(buffer, msg, count)) 145 return -EFAULT; 146 147 *offset = count; 148 return count; 149 } 150 151 /* Ioctls */ 152 static long ec_device_ioctl_xcmd(struct cros_ec_dev *ec, void __user *arg) 153 { 154 long ret; 155 struct cros_ec_command u_cmd; 156 struct cros_ec_command *s_cmd; 157 158 if (copy_from_user(&u_cmd, arg, sizeof(u_cmd))) 159 return -EFAULT; 160 161 if ((u_cmd.outsize > EC_MAX_MSG_BYTES) || 162 (u_cmd.insize > EC_MAX_MSG_BYTES)) 163 return -EINVAL; 164 165 s_cmd = kmalloc(sizeof(*s_cmd) + max(u_cmd.outsize, u_cmd.insize), 166 GFP_KERNEL); 167 if (!s_cmd) 168 return -ENOMEM; 169 170 if (copy_from_user(s_cmd, arg, sizeof(*s_cmd) + u_cmd.outsize)) { 171 ret = -EFAULT; 172 goto exit; 173 } 174 175 if (u_cmd.outsize != s_cmd->outsize || 176 u_cmd.insize != s_cmd->insize) { 177 ret = -EINVAL; 178 goto exit; 179 } 180 181 s_cmd->command += ec->cmd_offset; 182 ret = cros_ec_cmd_xfer(ec->ec_dev, s_cmd); 183 /* Only copy data to userland if data was received. */ 184 if (ret < 0) 185 goto exit; 186 187 if (copy_to_user(arg, s_cmd, sizeof(*s_cmd) + s_cmd->insize)) 188 ret = -EFAULT; 189 exit: 190 kfree(s_cmd); 191 return ret; 192 } 193 194 static long ec_device_ioctl_readmem(struct cros_ec_dev *ec, void __user *arg) 195 { 196 struct cros_ec_device *ec_dev = ec->ec_dev; 197 struct cros_ec_readmem s_mem = { }; 198 long num; 199 200 /* Not every platform supports direct reads */ 201 if (!ec_dev->cmd_readmem) 202 return -ENOTTY; 203 204 if (copy_from_user(&s_mem, arg, sizeof(s_mem))) 205 return -EFAULT; 206 207 num = ec_dev->cmd_readmem(ec_dev, s_mem.offset, s_mem.bytes, 208 s_mem.buffer); 209 if (num <= 0) 210 return num; 211 212 if (copy_to_user((void __user *)arg, &s_mem, sizeof(s_mem))) 213 return -EFAULT; 214 215 return num; 216 } 217 218 static long ec_device_ioctl(struct file *filp, unsigned int cmd, 219 unsigned long arg) 220 { 221 struct cros_ec_dev *ec = filp->private_data; 222 223 if (_IOC_TYPE(cmd) != CROS_EC_DEV_IOC) 224 return -ENOTTY; 225 226 switch (cmd) { 227 case CROS_EC_DEV_IOCXCMD: 228 return ec_device_ioctl_xcmd(ec, (void __user *)arg); 229 case CROS_EC_DEV_IOCRDMEM: 230 return ec_device_ioctl_readmem(ec, (void __user *)arg); 231 } 232 233 return -ENOTTY; 234 } 235 236 /* Module initialization */ 237 static const struct file_operations fops = { 238 .open = ec_device_open, 239 .release = ec_device_release, 240 .read = ec_device_read, 241 .unlocked_ioctl = ec_device_ioctl, 242 #ifdef CONFIG_COMPAT 243 .compat_ioctl = ec_device_ioctl, 244 #endif 245 }; 246 247 static void cros_ec_class_release(struct device *dev) 248 { 249 kfree(to_cros_ec_dev(dev)); 250 } 251 252 static void cros_ec_sensors_register(struct cros_ec_dev *ec) 253 { 254 /* 255 * Issue a command to get the number of sensor reported. 256 * Build an array of sensors driver and register them all. 257 */ 258 int ret, i, id, sensor_num; 259 struct mfd_cell *sensor_cells; 260 struct cros_ec_sensor_platform *sensor_platforms; 261 int sensor_type[MOTIONSENSE_TYPE_MAX]; 262 struct ec_params_motion_sense *params; 263 struct ec_response_motion_sense *resp; 264 struct cros_ec_command *msg; 265 266 msg = kzalloc(sizeof(struct cros_ec_command) + 267 max(sizeof(*params), sizeof(*resp)), GFP_KERNEL); 268 if (msg == NULL) 269 return; 270 271 msg->version = 2; 272 msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; 273 msg->outsize = sizeof(*params); 274 msg->insize = sizeof(*resp); 275 276 params = (struct ec_params_motion_sense *)msg->data; 277 params->cmd = MOTIONSENSE_CMD_DUMP; 278 279 ret = cros_ec_cmd_xfer(ec->ec_dev, msg); 280 if (ret < 0 || msg->result != EC_RES_SUCCESS) { 281 dev_warn(ec->dev, "cannot get EC sensor information: %d/%d\n", 282 ret, msg->result); 283 goto error; 284 } 285 286 resp = (struct ec_response_motion_sense *)msg->data; 287 sensor_num = resp->dump.sensor_count; 288 /* 289 * Allocate 2 extra sensors if lid angle sensor and/or FIFO are needed. 290 */ 291 sensor_cells = kcalloc(sensor_num + 2, sizeof(struct mfd_cell), 292 GFP_KERNEL); 293 if (sensor_cells == NULL) 294 goto error; 295 296 sensor_platforms = kcalloc(sensor_num, 297 sizeof(struct cros_ec_sensor_platform), 298 GFP_KERNEL); 299 if (sensor_platforms == NULL) 300 goto error_platforms; 301 302 memset(sensor_type, 0, sizeof(sensor_type)); 303 id = 0; 304 for (i = 0; i < sensor_num; i++) { 305 params->cmd = MOTIONSENSE_CMD_INFO; 306 params->info.sensor_num = i; 307 ret = cros_ec_cmd_xfer(ec->ec_dev, msg); 308 if (ret < 0 || msg->result != EC_RES_SUCCESS) { 309 dev_warn(ec->dev, "no info for EC sensor %d : %d/%d\n", 310 i, ret, msg->result); 311 continue; 312 } 313 switch (resp->info.type) { 314 case MOTIONSENSE_TYPE_ACCEL: 315 sensor_cells[id].name = "cros-ec-accel"; 316 break; 317 case MOTIONSENSE_TYPE_BARO: 318 sensor_cells[id].name = "cros-ec-baro"; 319 break; 320 case MOTIONSENSE_TYPE_GYRO: 321 sensor_cells[id].name = "cros-ec-gyro"; 322 break; 323 case MOTIONSENSE_TYPE_MAG: 324 sensor_cells[id].name = "cros-ec-mag"; 325 break; 326 case MOTIONSENSE_TYPE_PROX: 327 sensor_cells[id].name = "cros-ec-prox"; 328 break; 329 case MOTIONSENSE_TYPE_LIGHT: 330 sensor_cells[id].name = "cros-ec-light"; 331 break; 332 case MOTIONSENSE_TYPE_ACTIVITY: 333 sensor_cells[id].name = "cros-ec-activity"; 334 break; 335 default: 336 dev_warn(ec->dev, "unknown type %d\n", resp->info.type); 337 continue; 338 } 339 sensor_platforms[id].sensor_num = i; 340 sensor_cells[id].id = sensor_type[resp->info.type]; 341 sensor_cells[id].platform_data = &sensor_platforms[id]; 342 sensor_cells[id].pdata_size = 343 sizeof(struct cros_ec_sensor_platform); 344 345 sensor_type[resp->info.type]++; 346 id++; 347 } 348 349 if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2) 350 ec->has_kb_wake_angle = true; 351 352 if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) { 353 sensor_cells[id].name = "cros-ec-ring"; 354 id++; 355 } 356 if (cros_ec_check_features(ec, 357 EC_FEATURE_REFINED_TABLET_MODE_HYSTERESIS)) { 358 sensor_cells[id].name = "cros-ec-lid-angle"; 359 id++; 360 } 361 362 ret = mfd_add_devices(ec->dev, 0, sensor_cells, id, 363 NULL, 0, NULL); 364 if (ret) 365 dev_err(ec->dev, "failed to add EC sensors\n"); 366 367 kfree(sensor_platforms); 368 error_platforms: 369 kfree(sensor_cells); 370 error: 371 kfree(msg); 372 } 373 374 static struct cros_ec_sensor_platform sensor_platforms[] = { 375 { .sensor_num = 0 }, 376 { .sensor_num = 1 } 377 }; 378 379 static const struct mfd_cell cros_ec_accel_legacy_cells[] = { 380 { 381 .name = "cros-ec-accel-legacy", 382 .platform_data = &sensor_platforms[0], 383 .pdata_size = sizeof(struct cros_ec_sensor_platform), 384 }, 385 { 386 .name = "cros-ec-accel-legacy", 387 .platform_data = &sensor_platforms[1], 388 .pdata_size = sizeof(struct cros_ec_sensor_platform), 389 } 390 }; 391 392 static void cros_ec_accel_legacy_register(struct cros_ec_dev *ec) 393 { 394 struct cros_ec_device *ec_dev = ec->ec_dev; 395 u8 status; 396 int ret; 397 398 /* 399 * ECs that need legacy support are the main EC, directly connected to 400 * the AP. 401 */ 402 if (ec->cmd_offset != 0) 403 return; 404 405 /* 406 * Check if EC supports direct memory reads and if EC has 407 * accelerometers. 408 */ 409 if (ec_dev->cmd_readmem) { 410 ret = ec_dev->cmd_readmem(ec_dev, EC_MEMMAP_ACC_STATUS, 1, 411 &status); 412 if (ret < 0) { 413 dev_warn(ec->dev, "EC direct read error.\n"); 414 return; 415 } 416 417 /* Check if EC has accelerometers. */ 418 if (!(status & EC_MEMMAP_ACC_STATUS_PRESENCE_BIT)) { 419 dev_info(ec->dev, "EC does not have accelerometers.\n"); 420 return; 421 } 422 } 423 424 /* 425 * The device may still support accelerometers: 426 * it would be an older ARM based device that do not suppor the 427 * EC_CMD_GET_FEATURES command. 428 * 429 * Register 2 accelerometers, we will fail in the IIO driver if there 430 * are no sensors. 431 */ 432 ret = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO, 433 cros_ec_accel_legacy_cells, 434 ARRAY_SIZE(cros_ec_accel_legacy_cells), 435 NULL, 0, NULL); 436 if (ret) 437 dev_err(ec_dev->dev, "failed to add EC sensors\n"); 438 } 439 440 static const struct mfd_cell cros_ec_cec_cells[] = { 441 { .name = "cros-ec-cec" } 442 }; 443 444 static const struct mfd_cell cros_ec_rtc_cells[] = { 445 { .name = "cros-ec-rtc" } 446 }; 447 448 static const struct mfd_cell cros_usbpd_charger_cells[] = { 449 { .name = "cros-usbpd-charger" }, 450 { .name = "cros-usbpd-logger" }, 451 }; 452 453 static const struct mfd_cell cros_ec_platform_cells[] = { 454 { .name = "cros-ec-debugfs" }, 455 { .name = "cros-ec-lightbar" }, 456 { .name = "cros-ec-sysfs" }, 457 }; 458 459 static const struct mfd_cell cros_ec_vbc_cells[] = { 460 { .name = "cros-ec-vbc" } 461 }; 462 463 static int ec_device_probe(struct platform_device *pdev) 464 { 465 int retval = -ENOMEM; 466 struct device_node *node; 467 struct device *dev = &pdev->dev; 468 struct cros_ec_platform *ec_platform = dev_get_platdata(dev); 469 struct cros_ec_dev *ec = kzalloc(sizeof(*ec), GFP_KERNEL); 470 471 if (!ec) 472 return retval; 473 474 dev_set_drvdata(dev, ec); 475 ec->ec_dev = dev_get_drvdata(dev->parent); 476 ec->dev = dev; 477 ec->cmd_offset = ec_platform->cmd_offset; 478 ec->features[0] = -1U; /* Not cached yet */ 479 ec->features[1] = -1U; /* Not cached yet */ 480 device_initialize(&ec->class_dev); 481 cdev_init(&ec->cdev, &fops); 482 483 /* Check whether this is actually a Fingerprint MCU rather than an EC */ 484 if (cros_ec_check_features(ec, EC_FEATURE_FINGERPRINT)) { 485 dev_info(dev, "CrOS Fingerprint MCU detected.\n"); 486 /* 487 * Help userspace differentiating ECs from FP MCU, 488 * regardless of the probing order. 489 */ 490 ec_platform->ec_name = CROS_EC_DEV_FP_NAME; 491 } 492 493 /* 494 * Check whether this is actually an Integrated Sensor Hub (ISH) 495 * rather than an EC. 496 */ 497 if (cros_ec_check_features(ec, EC_FEATURE_ISH)) { 498 dev_info(dev, "CrOS ISH MCU detected.\n"); 499 /* 500 * Help userspace differentiating ECs from ISH MCU, 501 * regardless of the probing order. 502 */ 503 ec_platform->ec_name = CROS_EC_DEV_ISH_NAME; 504 } 505 506 /* Check whether this is actually a Touchpad MCU rather than an EC */ 507 if (cros_ec_check_features(ec, EC_FEATURE_TOUCHPAD)) { 508 dev_info(dev, "CrOS Touchpad MCU detected.\n"); 509 /* 510 * Help userspace differentiating ECs from TP MCU, 511 * regardless of the probing order. 512 */ 513 ec_platform->ec_name = CROS_EC_DEV_TP_NAME; 514 } 515 516 /* Check whether this is actually a SCP rather than an EC. */ 517 if (cros_ec_check_features(ec, EC_FEATURE_SCP)) { 518 dev_info(dev, "CrOS SCP MCU detected.\n"); 519 /* 520 * Help userspace differentiating ECs from SCP, 521 * regardless of the probing order. 522 */ 523 ec_platform->ec_name = CROS_EC_DEV_SCP_NAME; 524 } 525 526 /* 527 * Add the class device 528 * Link to the character device for creating the /dev entry 529 * in devtmpfs. 530 */ 531 ec->class_dev.devt = MKDEV(ec_major, pdev->id); 532 ec->class_dev.class = &cros_class; 533 ec->class_dev.parent = dev; 534 ec->class_dev.release = cros_ec_class_release; 535 536 retval = dev_set_name(&ec->class_dev, "%s", ec_platform->ec_name); 537 if (retval) { 538 dev_err(dev, "dev_set_name failed => %d\n", retval); 539 goto failed; 540 } 541 542 /* check whether this EC is a sensor hub. */ 543 if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE)) 544 cros_ec_sensors_register(ec); 545 else 546 /* Workaroud for older EC firmware */ 547 cros_ec_accel_legacy_register(ec); 548 549 /* Check whether this EC instance has CEC host command support */ 550 if (cros_ec_check_features(ec, EC_FEATURE_CEC)) { 551 retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO, 552 cros_ec_cec_cells, 553 ARRAY_SIZE(cros_ec_cec_cells), 554 NULL, 0, NULL); 555 if (retval) 556 dev_err(ec->dev, 557 "failed to add cros-ec-cec device: %d\n", 558 retval); 559 } 560 561 /* Check whether this EC instance has RTC host command support */ 562 if (cros_ec_check_features(ec, EC_FEATURE_RTC)) { 563 retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO, 564 cros_ec_rtc_cells, 565 ARRAY_SIZE(cros_ec_rtc_cells), 566 NULL, 0, NULL); 567 if (retval) 568 dev_err(ec->dev, 569 "failed to add cros-ec-rtc device: %d\n", 570 retval); 571 } 572 573 /* Check whether this EC instance has the PD charge manager */ 574 if (cros_ec_check_features(ec, EC_FEATURE_USB_PD)) { 575 retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO, 576 cros_usbpd_charger_cells, 577 ARRAY_SIZE(cros_usbpd_charger_cells), 578 NULL, 0, NULL); 579 if (retval) 580 dev_err(ec->dev, 581 "failed to add cros-usbpd-charger device: %d\n", 582 retval); 583 } 584 585 /* We can now add the sysfs class, we know which parameter to show */ 586 retval = cdev_device_add(&ec->cdev, &ec->class_dev); 587 if (retval) { 588 dev_err(dev, "cdev_device_add failed => %d\n", retval); 589 goto failed; 590 } 591 592 retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO, 593 cros_ec_platform_cells, 594 ARRAY_SIZE(cros_ec_platform_cells), 595 NULL, 0, NULL); 596 if (retval) 597 dev_warn(ec->dev, 598 "failed to add cros-ec platform devices: %d\n", 599 retval); 600 601 /* Check whether this EC instance has a VBC NVRAM */ 602 node = ec->ec_dev->dev->of_node; 603 if (of_property_read_bool(node, "google,has-vbc-nvram")) { 604 retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO, 605 cros_ec_vbc_cells, 606 ARRAY_SIZE(cros_ec_vbc_cells), 607 NULL, 0, NULL); 608 if (retval) 609 dev_warn(ec->dev, "failed to add VBC devices: %d\n", 610 retval); 611 } 612 613 return 0; 614 615 failed: 616 put_device(&ec->class_dev); 617 return retval; 618 } 619 620 static int ec_device_remove(struct platform_device *pdev) 621 { 622 struct cros_ec_dev *ec = dev_get_drvdata(&pdev->dev); 623 624 mfd_remove_devices(ec->dev); 625 cdev_del(&ec->cdev); 626 device_unregister(&ec->class_dev); 627 return 0; 628 } 629 630 static const struct platform_device_id cros_ec_id[] = { 631 { DRV_NAME, 0 }, 632 { /* sentinel */ } 633 }; 634 MODULE_DEVICE_TABLE(platform, cros_ec_id); 635 636 static struct platform_driver cros_ec_dev_driver = { 637 .driver = { 638 .name = DRV_NAME, 639 }, 640 .id_table = cros_ec_id, 641 .probe = ec_device_probe, 642 .remove = ec_device_remove, 643 }; 644 645 static int __init cros_ec_dev_init(void) 646 { 647 int ret; 648 dev_t dev = 0; 649 650 ret = class_register(&cros_class); 651 if (ret) { 652 pr_err(CROS_EC_DEV_NAME ": failed to register device class\n"); 653 return ret; 654 } 655 656 /* Get a range of minor numbers (starting with 0) to work with */ 657 ret = alloc_chrdev_region(&dev, 0, CROS_MAX_DEV, CROS_EC_DEV_NAME); 658 if (ret < 0) { 659 pr_err(CROS_EC_DEV_NAME ": alloc_chrdev_region() failed\n"); 660 goto failed_chrdevreg; 661 } 662 ec_major = MAJOR(dev); 663 664 /* Register the driver */ 665 ret = platform_driver_register(&cros_ec_dev_driver); 666 if (ret < 0) { 667 pr_warn(CROS_EC_DEV_NAME ": can't register driver: %d\n", ret); 668 goto failed_devreg; 669 } 670 return 0; 671 672 failed_devreg: 673 unregister_chrdev_region(MKDEV(ec_major, 0), CROS_MAX_DEV); 674 failed_chrdevreg: 675 class_unregister(&cros_class); 676 return ret; 677 } 678 679 static void __exit cros_ec_dev_exit(void) 680 { 681 platform_driver_unregister(&cros_ec_dev_driver); 682 unregister_chrdev(ec_major, CROS_EC_DEV_NAME); 683 class_unregister(&cros_class); 684 } 685 686 module_init(cros_ec_dev_init); 687 module_exit(cros_ec_dev_exit); 688 689 MODULE_ALIAS("platform:" DRV_NAME); 690 MODULE_AUTHOR("Bill Richardson <wfrichar@chromium.org>"); 691 MODULE_DESCRIPTION("Userspace interface to the Chrome OS Embedded Controller"); 692 MODULE_VERSION("1.0"); 693 MODULE_LICENSE("GPL"); 694