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 */
__get_latch(u16 port)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 */
__check_latch(u16 port,u8 val)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 */
__wait_latch(u16 port,u8 val)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 */
__device_refresh(void)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 */
__device_refresh_sync(void)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 */
__device_complete(void)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 */
hdaps_readb_one(unsigned int port,u8 * val)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(). */
__hdaps_read_pair(unsigned int port1,unsigned int port2,int * x,int * y)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 */
hdaps_read_pair(unsigned int port1,unsigned int port2,int * val1,int * val2)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 */
hdaps_device_init(void)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
hdaps_probe(struct platform_device * dev)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
hdaps_resume(struct device * dev)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 */
hdaps_calibrate(void)328 static void hdaps_calibrate(void)
329 {
330 __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &rest_x, &rest_y);
331 }
332
hdaps_mousedev_poll(struct input_polled_dev * dev)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
hdaps_position_show(struct device * dev,struct device_attribute * attr,char * buf)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
hdaps_variance_show(struct device * dev,struct device_attribute * attr,char * buf)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
hdaps_temp1_show(struct device * dev,struct device_attribute * attr,char * buf)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
hdaps_temp2_show(struct device * dev,struct device_attribute * attr,char * buf)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
hdaps_keyboard_activity_show(struct device * dev,struct device_attribute * attr,char * buf)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
hdaps_mouse_activity_show(struct device * dev,struct device_attribute * attr,char * buf)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
hdaps_calibrate_show(struct device * dev,struct device_attribute * attr,char * buf)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
hdaps_calibrate_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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
hdaps_invert_show(struct device * dev,struct device_attribute * attr,char * buf)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
hdaps_invert_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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. */
hdaps_dmi_match(const struct dmi_system_id * id)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. */
hdaps_dmi_match_invert(const struct dmi_system_id * id)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 const struct dmi_system_id hdaps_whitelist[] __initconst = {
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
hdaps_init(void)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
hdaps_exit(void)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
