Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/i2c-2.6
[linux-2.6] / drivers / hwmon / hdaps.c
1 /*
2  * drivers/hwmon/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 <jesper.juhl@gmail.com>
6  *
7  * The HardDisk Active Protection System (hdaps) is present in the IBM ThinkPad
8  * T41, T42, T43, R51, and X40, at least.  It provides a basic two-axis
9  * accelerometer and other data, such as the device's temperature.
10  *
11  * 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 #include <linux/delay.h>
30 #include <linux/device.h>
31 #include <linux/input.h>
32 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/timer.h>
35 #include <linux/dmi.h>
36 #include <asm/io.h>
37
38 #define HDAPS_LOW_PORT          0x1600  /* first port used by hdaps */
39 #define HDAPS_NR_PORTS          0x30    /* 0x1600 - 0x162f */
40
41 #define STATE_FRESH             0x50    /* accelerometer data is fresh */
42
43 #define REFRESH_ASYNC           0x00    /* do asynchronous refresh */
44 #define REFRESH_SYNC            0x01    /* do synchronous refresh */
45
46 #define HDAPS_PORT_STATE        0x1611  /* device state */
47 #define HDAPS_PORT_YPOS         0x1612  /* y-axis position */
48 #define HDAPS_PORT_XPOS         0x1614  /* x-axis position */
49 #define HDAPS_PORT_TEMP1        0x1616  /* device temperature, in celcius */
50 #define HDAPS_PORT_YVAR         0x1617  /* y-axis variance (what is this?) */
51 #define HDAPS_PORT_XVAR         0x1619  /* x-axis variance (what is this?) */
52 #define HDAPS_PORT_TEMP2        0x161b  /* device temperature (again?) */
53 #define HDAPS_PORT_UNKNOWN      0x161c  /* what is this? */
54 #define HDAPS_PORT_KMACT        0x161d  /* keyboard or mouse activity */
55
56 #define HDAPS_READ_MASK         0xff    /* some reads have the low 8 bits set */
57
58 #define KEYBD_MASK              0x20    /* set if keyboard activity */
59 #define MOUSE_MASK              0x40    /* set if mouse activity */
60 #define KEYBD_ISSET(n)          (!! (n & KEYBD_MASK))   /* keyboard used? */
61 #define MOUSE_ISSET(n)          (!! (n & MOUSE_MASK))   /* mouse used? */
62
63 #define INIT_TIMEOUT_MSECS      4000    /* wait up to 4s for device init ... */
64 #define INIT_WAIT_MSECS         200     /* ... in 200ms increments */
65
66 static struct platform_device *pdev;
67 static struct input_dev hdaps_idev;
68 static struct timer_list hdaps_timer;
69 static unsigned int hdaps_mousedev_threshold = 4;
70 static unsigned long hdaps_poll_ms = 50;
71 static unsigned int hdaps_mousedev;
72 static unsigned int hdaps_invert;
73 static u8 km_activity;
74 static int rest_x;
75 static int rest_y;
76
77 static DECLARE_MUTEX(hdaps_sem);
78
79 /*
80  * __get_latch - Get the value from a given port.  Callers must hold hdaps_sem.
81  */
82 static inline u8 __get_latch(u16 port)
83 {
84         return inb(port) & HDAPS_READ_MASK;
85 }
86
87 /*
88  * __check_latch - Check a port latch for a given value.  Callers must hold
89  * hdaps_sem.  Returns zero if the port contains the given value.
90  */
91 static inline unsigned int __check_latch(u16 port, u8 val)
92 {
93         if (__get_latch(port) == val)
94                 return 0;
95         return -EINVAL;
96 }
97
98 /*
99  * __wait_latch - Wait up to 100us for a port latch to get a certain value,
100  * returning zero if the value is obtained.  Callers must hold hdaps_sem.
101  */
102 static unsigned int __wait_latch(u16 port, u8 val)
103 {
104         unsigned int i;
105
106         for (i = 0; i < 20; i++) {
107                 if (!__check_latch(port, val))
108                         return 0;
109                 udelay(5);
110         }
111
112         return -EINVAL;
113 }
114
115 /*
116  * __device_refresh - Request a refresh from the accelerometer.
117  *
118  * If sync is REFRESH_SYNC, we perform a synchronous refresh and will wait.
119  * Returns zero if successful and nonzero on error.
120  *
121  * If sync is REFRESH_ASYNC, we merely kick off a new refresh if the device is
122  * not up-to-date.  Always returns zero.
123  *
124  * Callers must hold hdaps_sem.
125  */
126 static int __device_refresh(unsigned int sync)
127 {
128         u8 state;
129
130         udelay(100);
131
132         state = inb(0x1604);
133         if (state == STATE_FRESH)
134                 return 0;
135
136         outb(0x11, 0x1610);
137         outb(0x01, 0x161f);
138         if (sync == REFRESH_ASYNC)
139                 return 0;
140
141         return __wait_latch(0x1604, STATE_FRESH);
142 }
143
144 /*
145  * __device_complete - Indicate to the accelerometer that we are done reading
146  * data, and then initiate an async refresh.  Callers must hold hdaps_sem.
147  */
148 static inline void __device_complete(void)
149 {
150         inb(0x161f);
151         inb(0x1604);
152         __device_refresh(REFRESH_ASYNC);
153 }
154
155 static int __hdaps_readb_one(unsigned int port, u8 *val)
156 {
157         /* do a sync refresh -- we need to be sure that we read fresh data */
158         if (__device_refresh(REFRESH_SYNC))
159                 return -EIO;
160
161         *val = inb(port);
162         __device_complete();
163
164         return 0;
165 }
166
167 /*
168  * hdaps_readb_one - reads a byte from a single I/O port, placing the value in
169  * the given pointer.  Returns zero on success or a negative error on failure.
170  * Can sleep.
171  */
172 static int hdaps_readb_one(unsigned int port, u8 *val)
173 {
174         int ret;
175
176         down(&hdaps_sem);
177         ret = __hdaps_readb_one(port, val);
178         up(&hdaps_sem);
179
180         return ret;
181 }
182
183 static int __hdaps_read_pair(unsigned int port1, unsigned int port2,
184                              int *x, int *y)
185 {
186         /* do a sync refresh -- we need to be sure that we read fresh data */
187         if (__device_refresh(REFRESH_SYNC))
188                 return -EIO;
189
190         *y = inw(port2);
191         *x = inw(port1);
192         km_activity = inb(HDAPS_PORT_KMACT);
193         __device_complete();
194
195         /* if hdaps_invert is set, negate the two values */
196         if (hdaps_invert) {
197                 *x = -*x;
198                 *y = -*y;
199         }
200
201         return 0;
202 }
203
204 /*
205  * hdaps_read_pair - reads the values from a pair of ports, placing the values
206  * in the given pointers.  Returns zero on success.  Can sleep.
207  */
208 static int hdaps_read_pair(unsigned int port1, unsigned int port2,
209                            int *val1, int *val2)
210 {
211         int ret;
212
213         down(&hdaps_sem);
214         ret = __hdaps_read_pair(port1, port2, val1, val2);
215         up(&hdaps_sem);
216
217         return ret;
218 }
219
220 /* initialize the accelerometer */
221 static int hdaps_device_init(void)
222 {
223         unsigned int total_msecs = INIT_TIMEOUT_MSECS;
224         int ret = -ENXIO;
225
226         down(&hdaps_sem);
227
228         outb(0x13, 0x1610);
229         outb(0x01, 0x161f);
230         if (__wait_latch(0x161f, 0x00))
231                 goto out;
232
233         /*
234          * The 0x03 value appears to only work on some thinkpads, such as the
235          * T42p.  Others return 0x01.
236          *
237          * The 0x02 value occurs when the chip has been previously initialized.
238          */
239         if (__check_latch(0x1611, 0x03) &&
240                      __check_latch(0x1611, 0x02) &&
241                      __check_latch(0x1611, 0x01))
242                 goto out;
243
244         printk(KERN_DEBUG "hdaps: initial latch check good (0x%02x).\n",
245                __get_latch(0x1611));
246
247         outb(0x17, 0x1610);
248         outb(0x81, 0x1611);
249         outb(0x01, 0x161f);
250         if (__wait_latch(0x161f, 0x00))
251                 goto out;
252         if (__wait_latch(0x1611, 0x00))
253                 goto out;
254         if (__wait_latch(0x1612, 0x60))
255                 goto out;
256         if (__wait_latch(0x1613, 0x00))
257                 goto out;
258         outb(0x14, 0x1610);
259         outb(0x01, 0x1611);
260         outb(0x01, 0x161f);
261         if (__wait_latch(0x161f, 0x00))
262                 goto out;
263         outb(0x10, 0x1610);
264         outb(0xc8, 0x1611);
265         outb(0x00, 0x1612);
266         outb(0x02, 0x1613);
267         outb(0x01, 0x161f);
268         if (__wait_latch(0x161f, 0x00))
269                 goto out;
270         if (__device_refresh(REFRESH_SYNC))
271                 goto out;
272         if (__wait_latch(0x1611, 0x00))
273                 goto out;
274
275         /* we have done our dance, now let's wait for the applause */
276         while (total_msecs > 0) {
277                 u8 ignored;
278
279                 /* a read of the device helps push it into action */
280                 __hdaps_readb_one(HDAPS_PORT_UNKNOWN, &ignored);
281                 if (!__wait_latch(0x1611, 0x02)) {
282                         ret = 0;
283                         break;
284                 }
285
286                 msleep(INIT_WAIT_MSECS);
287                 total_msecs -= INIT_WAIT_MSECS;
288         }
289
290 out:
291         up(&hdaps_sem);
292         return ret;
293 }
294
295
296 /* Input class stuff */
297
298 /*
299  * hdaps_calibrate - Zero out our "resting" values. Callers must hold hdaps_sem.
300  */
301 static void hdaps_calibrate(void)
302 {
303         int x, y;
304
305         if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y))
306                 return;
307
308         rest_x = x;
309         rest_y = y;
310 }
311
312 static void hdaps_mousedev_poll(unsigned long unused)
313 {
314         int x, y;
315
316         /* Cannot sleep.  Try nonblockingly.  If we fail, try again later. */
317         if (down_trylock(&hdaps_sem)) {
318                 mod_timer(&hdaps_timer,jiffies+msecs_to_jiffies(hdaps_poll_ms));
319                 return;
320         }
321
322         if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y))
323                 goto out;
324
325         x -= rest_x;
326         y -= rest_y;
327         if (abs(x) > hdaps_mousedev_threshold)
328                 input_report_rel(&hdaps_idev, REL_X, x);
329         if (abs(y) > hdaps_mousedev_threshold)
330                 input_report_rel(&hdaps_idev, REL_Y, y);
331         input_sync(&hdaps_idev);
332
333         mod_timer(&hdaps_timer, jiffies + msecs_to_jiffies(hdaps_poll_ms));
334
335 out:
336         up(&hdaps_sem);
337 }
338
339 /*
340  * hdaps_mousedev_enable - enable the input class device.  Can sleep.
341  */
342 static void hdaps_mousedev_enable(void)
343 {
344         down(&hdaps_sem);
345
346         /* calibrate the device before enabling */
347         hdaps_calibrate();
348
349         /* initialize the input class */
350         init_input_dev(&hdaps_idev);
351         hdaps_idev.dev = &pdev->dev;
352         hdaps_idev.evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
353         hdaps_idev.relbit[0] = BIT(REL_X) | BIT(REL_Y);
354         hdaps_idev.keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT);
355         input_register_device(&hdaps_idev);
356
357         /* start up our timer */
358         init_timer(&hdaps_timer);
359         hdaps_timer.function = hdaps_mousedev_poll;
360         hdaps_timer.expires = jiffies + msecs_to_jiffies(hdaps_poll_ms);
361         add_timer(&hdaps_timer);
362
363         hdaps_mousedev = 1;
364
365         up(&hdaps_sem);
366
367         printk(KERN_INFO "hdaps: input device enabled.\n");
368 }
369
370 /*
371  * hdaps_mousedev_disable - disable the input class device.  Caller must hold
372  * hdaps_sem.
373  */
374 static void hdaps_mousedev_disable(void)
375 {
376         down(&hdaps_sem);
377         if (hdaps_mousedev) {
378                 hdaps_mousedev = 0;
379                 del_timer_sync(&hdaps_timer);
380                 input_unregister_device(&hdaps_idev);
381         }
382         up(&hdaps_sem);
383 }
384
385
386 /* Device model stuff */
387
388 static int hdaps_probe(struct device *dev)
389 {
390         int ret;
391
392         ret = hdaps_device_init();
393         if (ret)
394                 return ret;
395
396         printk(KERN_INFO "hdaps: device successfully initialized.\n");
397         return 0;
398 }
399
400 static int hdaps_resume(struct device *dev, u32 level)
401 {
402         if (level == RESUME_ENABLE)
403                 return hdaps_device_init();
404         return 0;
405 }
406
407 static struct device_driver hdaps_driver = {
408         .name = "hdaps",
409         .bus = &platform_bus_type,
410         .owner = THIS_MODULE,
411         .probe = hdaps_probe,
412         .resume = hdaps_resume
413 };
414
415
416 /* Sysfs Files */
417
418 static ssize_t hdaps_position_show(struct device *dev,
419                                    struct device_attribute *attr, char *buf)
420 {
421         int ret, x, y;
422
423         ret = hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
424         if (ret)
425                 return ret;
426
427         return sprintf(buf, "(%d,%d)\n", x, y);
428 }
429
430 static ssize_t hdaps_variance_show(struct device *dev,
431                                    struct device_attribute *attr, char *buf)
432 {
433         int ret, x, y;
434
435         ret = hdaps_read_pair(HDAPS_PORT_XVAR, HDAPS_PORT_YVAR, &x, &y);
436         if (ret)
437                 return ret;
438
439         return sprintf(buf, "(%d,%d)\n", x, y);
440 }
441
442 static ssize_t hdaps_temp1_show(struct device *dev,
443                                 struct device_attribute *attr, char *buf)
444 {
445         u8 temp;
446         int ret;
447
448         ret = hdaps_readb_one(HDAPS_PORT_TEMP1, &temp);
449         if (ret < 0)
450                 return ret;
451
452         return sprintf(buf, "%u\n", temp);
453 }
454
455 static ssize_t hdaps_temp2_show(struct device *dev,
456                                 struct device_attribute *attr, char *buf)
457 {
458         u8 temp;
459         int ret;
460
461         ret = hdaps_readb_one(HDAPS_PORT_TEMP2, &temp);
462         if (ret < 0)
463                 return ret;
464
465         return sprintf(buf, "%u\n", temp);
466 }
467
468 static ssize_t hdaps_keyboard_activity_show(struct device *dev,
469                                             struct device_attribute *attr,
470                                             char *buf)
471 {
472         return sprintf(buf, "%u\n", KEYBD_ISSET(km_activity));
473 }
474
475 static ssize_t hdaps_mouse_activity_show(struct device *dev,
476                                          struct device_attribute *attr,
477                                          char *buf)
478 {
479         return sprintf(buf, "%u\n", MOUSE_ISSET(km_activity));
480 }
481
482 static ssize_t hdaps_calibrate_show(struct device *dev,
483                                     struct device_attribute *attr, char *buf)
484 {
485         return sprintf(buf, "(%d,%d)\n", rest_x, rest_y);
486 }
487
488 static ssize_t hdaps_calibrate_store(struct device *dev,
489                                      struct device_attribute *attr,
490                                      const char *buf, size_t count)
491 {
492         down(&hdaps_sem);
493         hdaps_calibrate();
494         up(&hdaps_sem);
495
496         return count;
497 }
498
499 static ssize_t hdaps_invert_show(struct device *dev,
500                                  struct device_attribute *attr, char *buf)
501 {
502         return sprintf(buf, "%u\n", hdaps_invert);
503 }
504
505 static ssize_t hdaps_invert_store(struct device *dev,
506                                   struct device_attribute *attr,
507                                   const char *buf, size_t count)
508 {
509         int invert;
510
511         if (sscanf(buf, "%d", &invert) != 1 || (invert != 1 && invert != 0))
512                 return -EINVAL;
513
514         hdaps_invert = invert;
515         hdaps_calibrate();
516
517         return count;
518 }
519
520 static ssize_t hdaps_mousedev_show(struct device *dev,
521                                    struct device_attribute *attr, char *buf)
522 {
523         return sprintf(buf, "%d\n", hdaps_mousedev);
524 }
525
526 static ssize_t hdaps_mousedev_store(struct device *dev,
527                                     struct device_attribute *attr,
528                                     const char *buf, size_t count)
529 {
530         int enable;
531
532         if (sscanf(buf, "%d", &enable) != 1)
533                 return -EINVAL;
534
535         if (enable == 1)
536                 hdaps_mousedev_enable();
537         else if (enable == 0)
538                 hdaps_mousedev_disable();
539         else
540                 return -EINVAL;
541
542         return count;
543 }
544
545 static ssize_t hdaps_poll_show(struct device *dev,
546                                struct device_attribute *attr, char *buf)
547 {
548         return sprintf(buf, "%lu\n", hdaps_poll_ms);
549 }
550
551 static ssize_t hdaps_poll_store(struct device *dev,
552                                 struct device_attribute *attr,
553                                 const char *buf, size_t count)
554 {
555         unsigned int poll;
556
557         if (sscanf(buf, "%u", &poll) != 1 || poll == 0)
558                 return -EINVAL;
559         hdaps_poll_ms = poll;
560
561         return count;
562 }
563
564 static ssize_t hdaps_threshold_show(struct device *dev,
565                                     struct device_attribute *attr, char *buf)
566 {
567         return sprintf(buf, "%u\n", hdaps_mousedev_threshold);
568 }
569
570 static ssize_t hdaps_threshold_store(struct device *dev,
571                                      struct device_attribute *attr,
572                                      const char *buf, size_t count)
573 {
574         unsigned int threshold;
575
576         if (sscanf(buf, "%u", &threshold) != 1 || threshold == 0)
577                 return -EINVAL;
578         hdaps_mousedev_threshold = threshold;
579
580         return count;
581 }
582
583 static DEVICE_ATTR(position, 0444, hdaps_position_show, NULL);
584 static DEVICE_ATTR(variance, 0444, hdaps_variance_show, NULL);
585 static DEVICE_ATTR(temp1, 0444, hdaps_temp1_show, NULL);
586 static DEVICE_ATTR(temp2, 0444, hdaps_temp2_show, NULL);
587 static DEVICE_ATTR(keyboard_activity, 0444, hdaps_keyboard_activity_show, NULL);
588 static DEVICE_ATTR(mouse_activity, 0444, hdaps_mouse_activity_show, NULL);
589 static DEVICE_ATTR(calibrate, 0644, hdaps_calibrate_show,hdaps_calibrate_store);
590 static DEVICE_ATTR(invert, 0644, hdaps_invert_show, hdaps_invert_store);
591 static DEVICE_ATTR(mousedev, 0644, hdaps_mousedev_show, hdaps_mousedev_store);
592 static DEVICE_ATTR(mousedev_poll_ms, 0644, hdaps_poll_show, hdaps_poll_store);
593 static DEVICE_ATTR(mousedev_threshold, 0644, hdaps_threshold_show,
594                    hdaps_threshold_store);
595
596 static struct attribute *hdaps_attributes[] = {
597         &dev_attr_position.attr,
598         &dev_attr_variance.attr,
599         &dev_attr_temp1.attr,
600         &dev_attr_temp2.attr,
601         &dev_attr_keyboard_activity.attr,
602         &dev_attr_mouse_activity.attr,
603         &dev_attr_calibrate.attr,
604         &dev_attr_mousedev.attr,
605         &dev_attr_mousedev_threshold.attr,
606         &dev_attr_mousedev_poll_ms.attr,
607         &dev_attr_invert.attr,
608         NULL,
609 };
610
611 static struct attribute_group hdaps_attribute_group = {
612         .attrs = hdaps_attributes,
613 };
614
615
616 /* Module stuff */
617
618 /*
619  * XXX: We should be able to return nonzero and halt the detection process.
620  * But there is a bug in dmi_check_system() where a nonzero return from the
621  * first match will result in a return of failure from dmi_check_system().
622  * I fixed this; the patch is in 2.6-mm.  Once in Linus's tree we can make
623  * hdaps_dmi_match_invert() return hdaps_dmi_match(), which in turn returns 1.
624  */
625 static int hdaps_dmi_match(struct dmi_system_id *id)
626 {
627         printk(KERN_INFO "hdaps: %s detected.\n", id->ident);
628         return 0;
629 }
630
631 static int hdaps_dmi_match_invert(struct dmi_system_id *id)
632 {
633         hdaps_invert = 1;
634         printk(KERN_INFO "hdaps: inverting axis readings.\n");
635         return 0;
636 }
637
638 #define HDAPS_DMI_MATCH_NORMAL(model)   {               \
639         .ident = "IBM " model,                          \
640         .callback = hdaps_dmi_match,                    \
641         .matches = {                                    \
642                 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),     \
643                 DMI_MATCH(DMI_PRODUCT_VERSION, model)   \
644         }                                               \
645 }
646
647 #define HDAPS_DMI_MATCH_INVERT(model)   {               \
648         .ident = "IBM " model,                          \
649         .callback = hdaps_dmi_match_invert,             \
650         .matches = {                                    \
651                 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),     \
652                 DMI_MATCH(DMI_PRODUCT_VERSION, model)   \
653         }                                               \
654 }
655
656 static int __init hdaps_init(void)
657 {
658         int ret;
659
660         /* Note that DMI_MATCH(...,"ThinkPad T42") will match "ThinkPad T42p" */
661         struct dmi_system_id hdaps_whitelist[] = {
662                 HDAPS_DMI_MATCH_INVERT("ThinkPad R50p"),
663                 HDAPS_DMI_MATCH_NORMAL("ThinkPad R50"),
664                 HDAPS_DMI_MATCH_NORMAL("ThinkPad R51"),
665                 HDAPS_DMI_MATCH_INVERT("ThinkPad T41p"),
666                 HDAPS_DMI_MATCH_NORMAL("ThinkPad T41"),
667                 HDAPS_DMI_MATCH_INVERT("ThinkPad T42p"),
668                 HDAPS_DMI_MATCH_NORMAL("ThinkPad T42"),
669                 HDAPS_DMI_MATCH_NORMAL("ThinkPad T43"),
670                 HDAPS_DMI_MATCH_NORMAL("ThinkPad X40"),
671                 { .ident = NULL }
672         };
673
674         if (!dmi_check_system(hdaps_whitelist)) {
675                 printk(KERN_WARNING "hdaps: supported laptop not found!\n");
676                 ret = -ENXIO;
677                 goto out;
678         }
679
680         if (!request_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS, "hdaps")) {
681                 ret = -ENXIO;
682                 goto out;
683         }
684
685         ret = driver_register(&hdaps_driver);
686         if (ret)
687                 goto out_region;
688
689         pdev = platform_device_register_simple("hdaps", -1, NULL, 0);
690         if (IS_ERR(pdev)) {
691                 ret = PTR_ERR(pdev);
692                 goto out_driver;
693         }
694
695         ret = sysfs_create_group(&pdev->dev.kobj, &hdaps_attribute_group);
696         if (ret)
697                 goto out_device;
698
699         if (hdaps_mousedev)
700                 hdaps_mousedev_enable();
701
702         printk(KERN_INFO "hdaps: driver successfully loaded.\n");
703         return 0;
704
705 out_device:
706         platform_device_unregister(pdev);
707 out_driver:
708         driver_unregister(&hdaps_driver);
709 out_region:
710         release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS);
711 out:
712         printk(KERN_WARNING "hdaps: driver init failed (ret=%d)!\n", ret);
713         return ret;
714 }
715
716 static void __exit hdaps_exit(void)
717 {
718         hdaps_mousedev_disable();
719
720         sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group);
721         platform_device_unregister(pdev);
722         driver_unregister(&hdaps_driver);
723         release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS);
724
725         printk(KERN_INFO "hdaps: driver unloaded.\n");
726 }
727
728 module_init(hdaps_init);
729 module_exit(hdaps_exit);
730
731 module_param_named(mousedev, hdaps_mousedev, bool, 0);
732 MODULE_PARM_DESC(mousedev, "enable the input class device");
733
734 module_param_named(invert, hdaps_invert, bool, 0);
735 MODULE_PARM_DESC(invert, "invert data along each axis");
736
737 MODULE_AUTHOR("Robert Love");
738 MODULE_DESCRIPTION("IBM Hard Drive Active Protection System (HDAPS) driver");
739 MODULE_LICENSE("GPL v2");