1 /* 2 * hdaps.c - driver for IBM's Hard Drive Active Protection System 3 * 4 * Copyright (C) 2005 Robert Love <rml@novell.com> 5 * Copyright (C) 2005 Jesper Juhl <jj@chaosbits.net> 6 * 7 * The HardDisk Active Protection System (hdaps) is present in IBM ThinkPads 8 * starting with the R40, T41, and X40. It provides a basic two-axis 9 * accelerometer and other data, such as the device's temperature. 10 * 11 * This driver is based on the document by Mark A. Smith available at 12 * http://www.almaden.ibm.com/cs/people/marksmith/tpaps.html and a lot of trial 13 * and error. 14 * 15 * This program is free software; you can redistribute it and/or modify it 16 * under the terms of the GNU General Public License v2 as published by the 17 * Free Software Foundation. 18 * 19 * This program is distributed in the hope that it will be useful, but WITHOUT 20 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 21 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 22 * more details. 23 * 24 * You should have received a copy of the GNU General Public License along with 25 * this program; if not, write to the Free Software Foundation, Inc., 26 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA 27 */ 28 29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 30 31 #include <linux/delay.h> 32 #include <linux/platform_device.h> 33 #include <linux/input-polldev.h> 34 #include <linux/kernel.h> 35 #include <linux/mutex.h> 36 #include <linux/module.h> 37 #include <linux/timer.h> 38 #include <linux/dmi.h> 39 #include <linux/jiffies.h> 40 #include <linux/io.h> 41 42 #define HDAPS_LOW_PORT 0x1600 /* first port used by hdaps */ 43 #define HDAPS_NR_PORTS 0x30 /* number of ports: 0x1600 - 0x162f */ 44 45 #define HDAPS_PORT_STATE 0x1611 /* device state */ 46 #define HDAPS_PORT_YPOS 0x1612 /* y-axis position */ 47 #define HDAPS_PORT_XPOS 0x1614 /* x-axis position */ 48 #define HDAPS_PORT_TEMP1 0x1616 /* device temperature, in Celsius */ 49 #define HDAPS_PORT_YVAR 0x1617 /* y-axis variance (what is this?) */ 50 #define HDAPS_PORT_XVAR 0x1619 /* x-axis variance (what is this?) */ 51 #define HDAPS_PORT_TEMP2 0x161b /* device temperature (again?) */ 52 #define HDAPS_PORT_UNKNOWN 0x161c /* what is this? */ 53 #define HDAPS_PORT_KMACT 0x161d /* keyboard or mouse activity */ 54 55 #define STATE_FRESH 0x50 /* accelerometer data is fresh */ 56 57 #define KEYBD_MASK 0x20 /* set if keyboard activity */ 58 #define MOUSE_MASK 0x40 /* set if mouse activity */ 59 #define KEYBD_ISSET(n) (!! (n & KEYBD_MASK)) /* keyboard used? */ 60 #define MOUSE_ISSET(n) (!! (n & MOUSE_MASK)) /* mouse used? */ 61 62 #define INIT_TIMEOUT_MSECS 4000 /* wait up to 4s for device init ... */ 63 #define INIT_WAIT_MSECS 200 /* ... in 200ms increments */ 64 65 #define HDAPS_POLL_INTERVAL 50 /* poll for input every 1/20s (50 ms)*/ 66 #define HDAPS_INPUT_FUZZ 4 /* input event threshold */ 67 #define HDAPS_INPUT_FLAT 4 68 69 #define HDAPS_X_AXIS (1 << 0) 70 #define HDAPS_Y_AXIS (1 << 1) 71 #define HDAPS_BOTH_AXES (HDAPS_X_AXIS | HDAPS_Y_AXIS) 72 73 static struct platform_device *pdev; 74 static struct input_polled_dev *hdaps_idev; 75 static unsigned int hdaps_invert; 76 static u8 km_activity; 77 static int rest_x; 78 static int rest_y; 79 80 static DEFINE_MUTEX(hdaps_mtx); 81 82 /* 83 * __get_latch - Get the value from a given port. Callers must hold hdaps_mtx. 84 */ 85 static inline u8 __get_latch(u16 port) 86 { 87 return inb(port) & 0xff; 88 } 89 90 /* 91 * __check_latch - Check a port latch for a given value. Returns zero if the 92 * port contains the given value. Callers must hold hdaps_mtx. 93 */ 94 static inline int __check_latch(u16 port, u8 val) 95 { 96 if (__get_latch(port) == val) 97 return 0; 98 return -EINVAL; 99 } 100 101 /* 102 * __wait_latch - Wait up to 100us for a port latch to get a certain value, 103 * returning zero if the value is obtained. Callers must hold hdaps_mtx. 104 */ 105 static int __wait_latch(u16 port, u8 val) 106 { 107 unsigned int i; 108 109 for (i = 0; i < 20; i++) { 110 if (!__check_latch(port, val)) 111 return 0; 112 udelay(5); 113 } 114 115 return -EIO; 116 } 117 118 /* 119 * __device_refresh - request a refresh from the accelerometer. Does not wait 120 * for refresh to complete. Callers must hold hdaps_mtx. 121 */ 122 static void __device_refresh(void) 123 { 124 udelay(200); 125 if (inb(0x1604) != STATE_FRESH) { 126 outb(0x11, 0x1610); 127 outb(0x01, 0x161f); 128 } 129 } 130 131 /* 132 * __device_refresh_sync - request a synchronous refresh from the 133 * accelerometer. We wait for the refresh to complete. Returns zero if 134 * successful and nonzero on error. Callers must hold hdaps_mtx. 135 */ 136 static int __device_refresh_sync(void) 137 { 138 __device_refresh(); 139 return __wait_latch(0x1604, STATE_FRESH); 140 } 141 142 /* 143 * __device_complete - indicate to the accelerometer that we are done reading 144 * data, and then initiate an async refresh. Callers must hold hdaps_mtx. 145 */ 146 static inline void __device_complete(void) 147 { 148 inb(0x161f); 149 inb(0x1604); 150 __device_refresh(); 151 } 152 153 /* 154 * hdaps_readb_one - reads a byte from a single I/O port, placing the value in 155 * the given pointer. Returns zero on success or a negative error on failure. 156 * Can sleep. 157 */ 158 static int hdaps_readb_one(unsigned int port, u8 *val) 159 { 160 int ret; 161 162 mutex_lock(&hdaps_mtx); 163 164 /* do a sync refresh -- we need to be sure that we read fresh data */ 165 ret = __device_refresh_sync(); 166 if (ret) 167 goto out; 168 169 *val = inb(port); 170 __device_complete(); 171 172 out: 173 mutex_unlock(&hdaps_mtx); 174 return ret; 175 } 176 177 /* __hdaps_read_pair - internal lockless helper for hdaps_read_pair(). */ 178 static int __hdaps_read_pair(unsigned int port1, unsigned int port2, 179 int *x, int *y) 180 { 181 /* do a sync refresh -- we need to be sure that we read fresh data */ 182 if (__device_refresh_sync()) 183 return -EIO; 184 185 *y = inw(port2); 186 *x = inw(port1); 187 km_activity = inb(HDAPS_PORT_KMACT); 188 __device_complete(); 189 190 /* hdaps_invert is a bitvector to negate the axes */ 191 if (hdaps_invert & HDAPS_X_AXIS) 192 *x = -*x; 193 if (hdaps_invert & HDAPS_Y_AXIS) 194 *y = -*y; 195 196 return 0; 197 } 198 199 /* 200 * hdaps_read_pair - reads the values from a pair of ports, placing the values 201 * in the given pointers. Returns zero on success. Can sleep. 202 */ 203 static int hdaps_read_pair(unsigned int port1, unsigned int port2, 204 int *val1, int *val2) 205 { 206 int ret; 207 208 mutex_lock(&hdaps_mtx); 209 ret = __hdaps_read_pair(port1, port2, val1, val2); 210 mutex_unlock(&hdaps_mtx); 211 212 return ret; 213 } 214 215 /* 216 * hdaps_device_init - initialize the accelerometer. Returns zero on success 217 * and negative error code on failure. Can sleep. 218 */ 219 static int hdaps_device_init(void) 220 { 221 int total, ret = -ENXIO; 222 223 mutex_lock(&hdaps_mtx); 224 225 outb(0x13, 0x1610); 226 outb(0x01, 0x161f); 227 if (__wait_latch(0x161f, 0x00)) 228 goto out; 229 230 /* 231 * Most ThinkPads return 0x01. 232 * 233 * Others--namely the R50p, T41p, and T42p--return 0x03. These laptops 234 * have "inverted" axises. 235 * 236 * The 0x02 value occurs when the chip has been previously initialized. 237 */ 238 if (__check_latch(0x1611, 0x03) && 239 __check_latch(0x1611, 0x02) && 240 __check_latch(0x1611, 0x01)) 241 goto out; 242 243 printk(KERN_DEBUG "hdaps: initial latch check good (0x%02x)\n", 244 __get_latch(0x1611)); 245 246 outb(0x17, 0x1610); 247 outb(0x81, 0x1611); 248 outb(0x01, 0x161f); 249 if (__wait_latch(0x161f, 0x00)) 250 goto out; 251 if (__wait_latch(0x1611, 0x00)) 252 goto out; 253 if (__wait_latch(0x1612, 0x60)) 254 goto out; 255 if (__wait_latch(0x1613, 0x00)) 256 goto out; 257 outb(0x14, 0x1610); 258 outb(0x01, 0x1611); 259 outb(0x01, 0x161f); 260 if (__wait_latch(0x161f, 0x00)) 261 goto out; 262 outb(0x10, 0x1610); 263 outb(0xc8, 0x1611); 264 outb(0x00, 0x1612); 265 outb(0x02, 0x1613); 266 outb(0x01, 0x161f); 267 if (__wait_latch(0x161f, 0x00)) 268 goto out; 269 if (__device_refresh_sync()) 270 goto out; 271 if (__wait_latch(0x1611, 0x00)) 272 goto out; 273 274 /* we have done our dance, now let's wait for the applause */ 275 for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) { 276 int x, y; 277 278 /* a read of the device helps push it into action */ 279 __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y); 280 if (!__wait_latch(0x1611, 0x02)) { 281 ret = 0; 282 break; 283 } 284 285 msleep(INIT_WAIT_MSECS); 286 } 287 288 out: 289 mutex_unlock(&hdaps_mtx); 290 return ret; 291 } 292 293 294 /* Device model stuff */ 295 296 static int hdaps_probe(struct platform_device *dev) 297 { 298 int ret; 299 300 ret = hdaps_device_init(); 301 if (ret) 302 return ret; 303 304 pr_info("device successfully initialized\n"); 305 return 0; 306 } 307 308 static int hdaps_resume(struct device *dev) 309 { 310 return hdaps_device_init(); 311 } 312 313 static SIMPLE_DEV_PM_OPS(hdaps_pm, NULL, hdaps_resume); 314 315 static struct platform_driver hdaps_driver = { 316 .probe = hdaps_probe, 317 .driver = { 318 .name = "hdaps", 319 .owner = THIS_MODULE, 320 .pm = &hdaps_pm, 321 }, 322 }; 323 324 /* 325 * hdaps_calibrate - Set our "resting" values. Callers must hold hdaps_mtx. 326 */ 327 static void hdaps_calibrate(void) 328 { 329 __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &rest_x, &rest_y); 330 } 331 332 static void hdaps_mousedev_poll(struct input_polled_dev *dev) 333 { 334 struct input_dev *input_dev = dev->input; 335 int x, y; 336 337 mutex_lock(&hdaps_mtx); 338 339 if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y)) 340 goto out; 341 342 input_report_abs(input_dev, ABS_X, x - rest_x); 343 input_report_abs(input_dev, ABS_Y, y - rest_y); 344 input_sync(input_dev); 345 346 out: 347 mutex_unlock(&hdaps_mtx); 348 } 349 350 351 /* Sysfs Files */ 352 353 static ssize_t hdaps_position_show(struct device *dev, 354 struct device_attribute *attr, char *buf) 355 { 356 int ret, x, y; 357 358 ret = hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y); 359 if (ret) 360 return ret; 361 362 return sprintf(buf, "(%d,%d)\n", x, y); 363 } 364 365 static ssize_t hdaps_variance_show(struct device *dev, 366 struct device_attribute *attr, char *buf) 367 { 368 int ret, x, y; 369 370 ret = hdaps_read_pair(HDAPS_PORT_XVAR, HDAPS_PORT_YVAR, &x, &y); 371 if (ret) 372 return ret; 373 374 return sprintf(buf, "(%d,%d)\n", x, y); 375 } 376 377 static ssize_t hdaps_temp1_show(struct device *dev, 378 struct device_attribute *attr, char *buf) 379 { 380 u8 uninitialized_var(temp); 381 int ret; 382 383 ret = hdaps_readb_one(HDAPS_PORT_TEMP1, &temp); 384 if (ret) 385 return ret; 386 387 return sprintf(buf, "%u\n", temp); 388 } 389 390 static ssize_t hdaps_temp2_show(struct device *dev, 391 struct device_attribute *attr, char *buf) 392 { 393 u8 uninitialized_var(temp); 394 int ret; 395 396 ret = hdaps_readb_one(HDAPS_PORT_TEMP2, &temp); 397 if (ret) 398 return ret; 399 400 return sprintf(buf, "%u\n", temp); 401 } 402 403 static ssize_t hdaps_keyboard_activity_show(struct device *dev, 404 struct device_attribute *attr, 405 char *buf) 406 { 407 return sprintf(buf, "%u\n", KEYBD_ISSET(km_activity)); 408 } 409 410 static ssize_t hdaps_mouse_activity_show(struct device *dev, 411 struct device_attribute *attr, 412 char *buf) 413 { 414 return sprintf(buf, "%u\n", MOUSE_ISSET(km_activity)); 415 } 416 417 static ssize_t hdaps_calibrate_show(struct device *dev, 418 struct device_attribute *attr, char *buf) 419 { 420 return sprintf(buf, "(%d,%d)\n", rest_x, rest_y); 421 } 422 423 static ssize_t hdaps_calibrate_store(struct device *dev, 424 struct device_attribute *attr, 425 const char *buf, size_t count) 426 { 427 mutex_lock(&hdaps_mtx); 428 hdaps_calibrate(); 429 mutex_unlock(&hdaps_mtx); 430 431 return count; 432 } 433 434 static ssize_t hdaps_invert_show(struct device *dev, 435 struct device_attribute *attr, char *buf) 436 { 437 return sprintf(buf, "%u\n", hdaps_invert); 438 } 439 440 static ssize_t hdaps_invert_store(struct device *dev, 441 struct device_attribute *attr, 442 const char *buf, size_t count) 443 { 444 int invert; 445 446 if (sscanf(buf, "%d", &invert) != 1 || 447 invert < 0 || invert > HDAPS_BOTH_AXES) 448 return -EINVAL; 449 450 hdaps_invert = invert; 451 hdaps_calibrate(); 452 453 return count; 454 } 455 456 static DEVICE_ATTR(position, 0444, hdaps_position_show, NULL); 457 static DEVICE_ATTR(variance, 0444, hdaps_variance_show, NULL); 458 static DEVICE_ATTR(temp1, 0444, hdaps_temp1_show, NULL); 459 static DEVICE_ATTR(temp2, 0444, hdaps_temp2_show, NULL); 460 static DEVICE_ATTR(keyboard_activity, 0444, hdaps_keyboard_activity_show, NULL); 461 static DEVICE_ATTR(mouse_activity, 0444, hdaps_mouse_activity_show, NULL); 462 static DEVICE_ATTR(calibrate, 0644, hdaps_calibrate_show,hdaps_calibrate_store); 463 static DEVICE_ATTR(invert, 0644, hdaps_invert_show, hdaps_invert_store); 464 465 static struct attribute *hdaps_attributes[] = { 466 &dev_attr_position.attr, 467 &dev_attr_variance.attr, 468 &dev_attr_temp1.attr, 469 &dev_attr_temp2.attr, 470 &dev_attr_keyboard_activity.attr, 471 &dev_attr_mouse_activity.attr, 472 &dev_attr_calibrate.attr, 473 &dev_attr_invert.attr, 474 NULL, 475 }; 476 477 static struct attribute_group hdaps_attribute_group = { 478 .attrs = hdaps_attributes, 479 }; 480 481 482 /* Module stuff */ 483 484 /* hdaps_dmi_match - found a match. return one, short-circuiting the hunt. */ 485 static int __init hdaps_dmi_match(const struct dmi_system_id *id) 486 { 487 pr_info("%s detected\n", id->ident); 488 return 1; 489 } 490 491 /* hdaps_dmi_match_invert - found an inverted match. */ 492 static int __init hdaps_dmi_match_invert(const struct dmi_system_id *id) 493 { 494 hdaps_invert = (unsigned long)id->driver_data; 495 pr_info("inverting axis (%u) readings\n", hdaps_invert); 496 return hdaps_dmi_match(id); 497 } 498 499 #define HDAPS_DMI_MATCH_INVERT(vendor, model, axes) { \ 500 .ident = vendor " " model, \ 501 .callback = hdaps_dmi_match_invert, \ 502 .driver_data = (void *)axes, \ 503 .matches = { \ 504 DMI_MATCH(DMI_BOARD_VENDOR, vendor), \ 505 DMI_MATCH(DMI_PRODUCT_VERSION, model) \ 506 } \ 507 } 508 509 #define HDAPS_DMI_MATCH_NORMAL(vendor, model) \ 510 HDAPS_DMI_MATCH_INVERT(vendor, model, 0) 511 512 /* Note that HDAPS_DMI_MATCH_NORMAL("ThinkPad T42") would match 513 "ThinkPad T42p", so the order of the entries matters. 514 If your ThinkPad is not recognized, please update to latest 515 BIOS. This is especially the case for some R52 ThinkPads. */ 516 static struct dmi_system_id __initdata hdaps_whitelist[] = { 517 HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad R50p", HDAPS_BOTH_AXES), 518 HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad R50"), 519 HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad R51"), 520 HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad R52"), 521 HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad R61i", HDAPS_BOTH_AXES), 522 HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad R61", HDAPS_BOTH_AXES), 523 HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad T41p", HDAPS_BOTH_AXES), 524 HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T41"), 525 HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad T42p", HDAPS_BOTH_AXES), 526 HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T42"), 527 HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T43"), 528 HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T400", HDAPS_BOTH_AXES), 529 HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T60", HDAPS_BOTH_AXES), 530 HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T61p", HDAPS_BOTH_AXES), 531 HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T61", HDAPS_BOTH_AXES), 532 HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad X40"), 533 HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad X41", HDAPS_Y_AXIS), 534 HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X60", HDAPS_BOTH_AXES), 535 HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X61s", HDAPS_BOTH_AXES), 536 HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X61", HDAPS_BOTH_AXES), 537 HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad Z60m"), 538 HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad Z61m", HDAPS_BOTH_AXES), 539 HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad Z61p", HDAPS_BOTH_AXES), 540 { .ident = NULL } 541 }; 542 543 static int __init hdaps_init(void) 544 { 545 struct input_dev *idev; 546 int ret; 547 548 if (!dmi_check_system(hdaps_whitelist)) { 549 pr_warn("supported laptop not found!\n"); 550 ret = -ENODEV; 551 goto out; 552 } 553 554 if (!request_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS, "hdaps")) { 555 ret = -ENXIO; 556 goto out; 557 } 558 559 ret = platform_driver_register(&hdaps_driver); 560 if (ret) 561 goto out_region; 562 563 pdev = platform_device_register_simple("hdaps", -1, NULL, 0); 564 if (IS_ERR(pdev)) { 565 ret = PTR_ERR(pdev); 566 goto out_driver; 567 } 568 569 ret = sysfs_create_group(&pdev->dev.kobj, &hdaps_attribute_group); 570 if (ret) 571 goto out_device; 572 573 hdaps_idev = input_allocate_polled_device(); 574 if (!hdaps_idev) { 575 ret = -ENOMEM; 576 goto out_group; 577 } 578 579 hdaps_idev->poll = hdaps_mousedev_poll; 580 hdaps_idev->poll_interval = HDAPS_POLL_INTERVAL; 581 582 /* initial calibrate for the input device */ 583 hdaps_calibrate(); 584 585 /* initialize the input class */ 586 idev = hdaps_idev->input; 587 idev->name = "hdaps"; 588 idev->phys = "isa1600/input0"; 589 idev->id.bustype = BUS_ISA; 590 idev->dev.parent = &pdev->dev; 591 idev->evbit[0] = BIT_MASK(EV_ABS); 592 input_set_abs_params(idev, ABS_X, 593 -256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT); 594 input_set_abs_params(idev, ABS_Y, 595 -256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT); 596 597 ret = input_register_polled_device(hdaps_idev); 598 if (ret) 599 goto out_idev; 600 601 pr_info("driver successfully loaded\n"); 602 return 0; 603 604 out_idev: 605 input_free_polled_device(hdaps_idev); 606 out_group: 607 sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group); 608 out_device: 609 platform_device_unregister(pdev); 610 out_driver: 611 platform_driver_unregister(&hdaps_driver); 612 out_region: 613 release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS); 614 out: 615 pr_warn("driver init failed (ret=%d)!\n", ret); 616 return ret; 617 } 618 619 static void __exit hdaps_exit(void) 620 { 621 input_unregister_polled_device(hdaps_idev); 622 input_free_polled_device(hdaps_idev); 623 sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group); 624 platform_device_unregister(pdev); 625 platform_driver_unregister(&hdaps_driver); 626 release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS); 627 628 pr_info("driver unloaded\n"); 629 } 630 631 module_init(hdaps_init); 632 module_exit(hdaps_exit); 633 634 module_param_named(invert, hdaps_invert, int, 0); 635 MODULE_PARM_DESC(invert, "invert data along each axis. 1 invert x-axis, " 636 "2 invert y-axis, 3 invert both axes."); 637 638 MODULE_AUTHOR("Robert Love"); 639 MODULE_DESCRIPTION("IBM Hard Drive Active Protection System (HDAPS) driver"); 640 MODULE_LICENSE("GPL v2"); 641