Version:  2.0.40 2.2.26 2.4.37 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19

Linux/drivers/platform/x86/hdaps.c

  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 #ifdef CONFIG_PM_SLEEP
309 static int hdaps_resume(struct device *dev)
310 {
311         return hdaps_device_init();
312 }
313 #endif
314 
315 static SIMPLE_DEV_PM_OPS(hdaps_pm, NULL, hdaps_resume);
316 
317 static struct platform_driver hdaps_driver = {
318         .probe = hdaps_probe,
319         .driver = {
320                 .name = "hdaps",
321                 .pm = &hdaps_pm,
322         },
323 };
324 
325 /*
326  * hdaps_calibrate - Set our "resting" values.  Callers must hold hdaps_mtx.
327  */
328 static void hdaps_calibrate(void)
329 {
330         __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &rest_x, &rest_y);
331 }
332 
333 static void hdaps_mousedev_poll(struct input_polled_dev *dev)
334 {
335         struct input_dev *input_dev = dev->input;
336         int x, y;
337 
338         mutex_lock(&hdaps_mtx);
339 
340         if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y))
341                 goto out;
342 
343         input_report_abs(input_dev, ABS_X, x - rest_x);
344         input_report_abs(input_dev, ABS_Y, y - rest_y);
345         input_sync(input_dev);
346 
347 out:
348         mutex_unlock(&hdaps_mtx);
349 }
350 
351 
352 /* Sysfs Files */
353 
354 static ssize_t hdaps_position_show(struct device *dev,
355                                    struct device_attribute *attr, char *buf)
356 {
357         int ret, x, y;
358 
359         ret = hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
360         if (ret)
361                 return ret;
362 
363         return sprintf(buf, "(%d,%d)\n", x, y);
364 }
365 
366 static ssize_t hdaps_variance_show(struct device *dev,
367                                    struct device_attribute *attr, char *buf)
368 {
369         int ret, x, y;
370 
371         ret = hdaps_read_pair(HDAPS_PORT_XVAR, HDAPS_PORT_YVAR, &x, &y);
372         if (ret)
373                 return ret;
374 
375         return sprintf(buf, "(%d,%d)\n", x, y);
376 }
377 
378 static ssize_t hdaps_temp1_show(struct device *dev,
379                                 struct device_attribute *attr, char *buf)
380 {
381         u8 uninitialized_var(temp);
382         int ret;
383 
384         ret = hdaps_readb_one(HDAPS_PORT_TEMP1, &temp);
385         if (ret)
386                 return ret;
387 
388         return sprintf(buf, "%u\n", temp);
389 }
390 
391 static ssize_t hdaps_temp2_show(struct device *dev,
392                                 struct device_attribute *attr, char *buf)
393 {
394         u8 uninitialized_var(temp);
395         int ret;
396 
397         ret = hdaps_readb_one(HDAPS_PORT_TEMP2, &temp);
398         if (ret)
399                 return ret;
400 
401         return sprintf(buf, "%u\n", temp);
402 }
403 
404 static ssize_t hdaps_keyboard_activity_show(struct device *dev,
405                                             struct device_attribute *attr,
406                                             char *buf)
407 {
408         return sprintf(buf, "%u\n", KEYBD_ISSET(km_activity));
409 }
410 
411 static ssize_t hdaps_mouse_activity_show(struct device *dev,
412                                          struct device_attribute *attr,
413                                          char *buf)
414 {
415         return sprintf(buf, "%u\n", MOUSE_ISSET(km_activity));
416 }
417 
418 static ssize_t hdaps_calibrate_show(struct device *dev,
419                                     struct device_attribute *attr, char *buf)
420 {
421         return sprintf(buf, "(%d,%d)\n", rest_x, rest_y);
422 }
423 
424 static ssize_t hdaps_calibrate_store(struct device *dev,
425                                      struct device_attribute *attr,
426                                      const char *buf, size_t count)
427 {
428         mutex_lock(&hdaps_mtx);
429         hdaps_calibrate();
430         mutex_unlock(&hdaps_mtx);
431 
432         return count;
433 }
434 
435 static ssize_t hdaps_invert_show(struct device *dev,
436                                  struct device_attribute *attr, char *buf)
437 {
438         return sprintf(buf, "%u\n", hdaps_invert);
439 }
440 
441 static ssize_t hdaps_invert_store(struct device *dev,
442                                   struct device_attribute *attr,
443                                   const char *buf, size_t count)
444 {
445         int invert;
446 
447         if (sscanf(buf, "%d", &invert) != 1 ||
448             invert < 0 || invert > HDAPS_BOTH_AXES)
449                 return -EINVAL;
450 
451         hdaps_invert = invert;
452         hdaps_calibrate();
453 
454         return count;
455 }
456 
457 static DEVICE_ATTR(position, 0444, hdaps_position_show, NULL);
458 static DEVICE_ATTR(variance, 0444, hdaps_variance_show, NULL);
459 static DEVICE_ATTR(temp1, 0444, hdaps_temp1_show, NULL);
460 static DEVICE_ATTR(temp2, 0444, hdaps_temp2_show, NULL);
461 static DEVICE_ATTR(keyboard_activity, 0444, hdaps_keyboard_activity_show, NULL);
462 static DEVICE_ATTR(mouse_activity, 0444, hdaps_mouse_activity_show, NULL);
463 static DEVICE_ATTR(calibrate, 0644, hdaps_calibrate_show,hdaps_calibrate_store);
464 static DEVICE_ATTR(invert, 0644, hdaps_invert_show, hdaps_invert_store);
465 
466 static struct attribute *hdaps_attributes[] = {
467         &dev_attr_position.attr,
468         &dev_attr_variance.attr,
469         &dev_attr_temp1.attr,
470         &dev_attr_temp2.attr,
471         &dev_attr_keyboard_activity.attr,
472         &dev_attr_mouse_activity.attr,
473         &dev_attr_calibrate.attr,
474         &dev_attr_invert.attr,
475         NULL,
476 };
477 
478 static struct attribute_group hdaps_attribute_group = {
479         .attrs = hdaps_attributes,
480 };
481 
482 
483 /* Module stuff */
484 
485 /* hdaps_dmi_match - found a match.  return one, short-circuiting the hunt. */
486 static int __init hdaps_dmi_match(const struct dmi_system_id *id)
487 {
488         pr_info("%s detected\n", id->ident);
489         return 1;
490 }
491 
492 /* hdaps_dmi_match_invert - found an inverted match. */
493 static int __init hdaps_dmi_match_invert(const struct dmi_system_id *id)
494 {
495         hdaps_invert = (unsigned long)id->driver_data;
496         pr_info("inverting axis (%u) readings\n", hdaps_invert);
497         return hdaps_dmi_match(id);
498 }
499 
500 #define HDAPS_DMI_MATCH_INVERT(vendor, model, axes) {   \
501         .ident = vendor " " model,                      \
502         .callback = hdaps_dmi_match_invert,             \
503         .driver_data = (void *)axes,                    \
504         .matches = {                                    \
505                 DMI_MATCH(DMI_BOARD_VENDOR, vendor),    \
506                 DMI_MATCH(DMI_PRODUCT_VERSION, model)   \
507         }                                               \
508 }
509 
510 #define HDAPS_DMI_MATCH_NORMAL(vendor, model)           \
511         HDAPS_DMI_MATCH_INVERT(vendor, model, 0)
512 
513 /* Note that HDAPS_DMI_MATCH_NORMAL("ThinkPad T42") would match
514    "ThinkPad T42p", so the order of the entries matters.
515    If your ThinkPad is not recognized, please update to latest
516    BIOS. This is especially the case for some R52 ThinkPads. */
517 static struct dmi_system_id __initdata hdaps_whitelist[] = {
518         HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad R50p", HDAPS_BOTH_AXES),
519         HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad R50"),
520         HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad R51"),
521         HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad R52"),
522         HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad R61i", HDAPS_BOTH_AXES),
523         HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad R61", HDAPS_BOTH_AXES),
524         HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad T41p", HDAPS_BOTH_AXES),
525         HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T41"),
526         HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad T42p", HDAPS_BOTH_AXES),
527         HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T42"),
528         HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T43"),
529         HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T400", HDAPS_BOTH_AXES),
530         HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T60", HDAPS_BOTH_AXES),
531         HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T61p", HDAPS_BOTH_AXES),
532         HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T61", HDAPS_BOTH_AXES),
533         HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad X40"),
534         HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad X41", HDAPS_Y_AXIS),
535         HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X60", HDAPS_BOTH_AXES),
536         HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X61s", HDAPS_BOTH_AXES),
537         HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X61", HDAPS_BOTH_AXES),
538         HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad Z60m"),
539         HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad Z61m", HDAPS_BOTH_AXES),
540         HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad Z61p", HDAPS_BOTH_AXES),
541         { .ident = NULL }
542 };
543 
544 static int __init hdaps_init(void)
545 {
546         struct input_dev *idev;
547         int ret;
548 
549         if (!dmi_check_system(hdaps_whitelist)) {
550                 pr_warn("supported laptop not found!\n");
551                 ret = -ENODEV;
552                 goto out;
553         }
554 
555         if (!request_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS, "hdaps")) {
556                 ret = -ENXIO;
557                 goto out;
558         }
559 
560         ret = platform_driver_register(&hdaps_driver);
561         if (ret)
562                 goto out_region;
563 
564         pdev = platform_device_register_simple("hdaps", -1, NULL, 0);
565         if (IS_ERR(pdev)) {
566                 ret = PTR_ERR(pdev);
567                 goto out_driver;
568         }
569 
570         ret = sysfs_create_group(&pdev->dev.kobj, &hdaps_attribute_group);
571         if (ret)
572                 goto out_device;
573 
574         hdaps_idev = input_allocate_polled_device();
575         if (!hdaps_idev) {
576                 ret = -ENOMEM;
577                 goto out_group;
578         }
579 
580         hdaps_idev->poll = hdaps_mousedev_poll;
581         hdaps_idev->poll_interval = HDAPS_POLL_INTERVAL;
582 
583         /* initial calibrate for the input device */
584         hdaps_calibrate();
585 
586         /* initialize the input class */
587         idev = hdaps_idev->input;
588         idev->name = "hdaps";
589         idev->phys = "isa1600/input0";
590         idev->id.bustype = BUS_ISA;
591         idev->dev.parent = &pdev->dev;
592         idev->evbit[0] = BIT_MASK(EV_ABS);
593         input_set_abs_params(idev, ABS_X,
594                         -256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT);
595         input_set_abs_params(idev, ABS_Y,
596                         -256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT);
597 
598         ret = input_register_polled_device(hdaps_idev);
599         if (ret)
600                 goto out_idev;
601 
602         pr_info("driver successfully loaded\n");
603         return 0;
604 
605 out_idev:
606         input_free_polled_device(hdaps_idev);
607 out_group:
608         sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group);
609 out_device:
610         platform_device_unregister(pdev);
611 out_driver:
612         platform_driver_unregister(&hdaps_driver);
613 out_region:
614         release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS);
615 out:
616         pr_warn("driver init failed (ret=%d)!\n", ret);
617         return ret;
618 }
619 
620 static void __exit hdaps_exit(void)
621 {
622         input_unregister_polled_device(hdaps_idev);
623         input_free_polled_device(hdaps_idev);
624         sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group);
625         platform_device_unregister(pdev);
626         platform_driver_unregister(&hdaps_driver);
627         release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS);
628 
629         pr_info("driver unloaded\n");
630 }
631 
632 module_init(hdaps_init);
633 module_exit(hdaps_exit);
634 
635 module_param_named(invert, hdaps_invert, int, 0);
636 MODULE_PARM_DESC(invert, "invert data along each axis. 1 invert x-axis, "
637                  "2 invert y-axis, 3 invert both axes.");
638 
639 MODULE_AUTHOR("Robert Love");
640 MODULE_DESCRIPTION("IBM Hard Drive Active Protection System (HDAPS) driver");
641 MODULE_LICENSE("GPL v2");
642 

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