blob: 0015da5668a181aa8f9956cc59539c49483c3d95 [file] [log] [blame]
Robert Love860e1d62005-08-31 23:57:59 -04001/*
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 *
Robert Love4c87b742005-09-22 21:44:00 -07007 * 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.
Robert Love860e1d62005-08-31 23:57:59 -040010 *
Robert Love393ad292005-09-16 19:28:07 -070011 * This driver is based on the document by Mark A. Smith available at
Robert Love860e1d62005-08-31 23:57:59 -040012 * 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 */
Robert Love393ad292005-09-16 19:28:07 -070039#define HDAPS_NR_PORTS 0x30 /* number of ports: 0x1600 - 0x162f */
Robert Love860e1d62005-08-31 23:57:59 -040040
41#define HDAPS_PORT_STATE 0x1611 /* device state */
42#define HDAPS_PORT_YPOS 0x1612 /* y-axis position */
43#define HDAPS_PORT_XPOS 0x1614 /* x-axis position */
44#define HDAPS_PORT_TEMP1 0x1616 /* device temperature, in celcius */
45#define HDAPS_PORT_YVAR 0x1617 /* y-axis variance (what is this?) */
46#define HDAPS_PORT_XVAR 0x1619 /* x-axis variance (what is this?) */
47#define HDAPS_PORT_TEMP2 0x161b /* device temperature (again?) */
48#define HDAPS_PORT_UNKNOWN 0x161c /* what is this? */
49#define HDAPS_PORT_KMACT 0x161d /* keyboard or mouse activity */
50
Robert Love393ad292005-09-16 19:28:07 -070051#define STATE_FRESH 0x50 /* accelerometer data is fresh */
Robert Love860e1d62005-08-31 23:57:59 -040052
53#define KEYBD_MASK 0x20 /* set if keyboard activity */
54#define MOUSE_MASK 0x40 /* set if mouse activity */
55#define KEYBD_ISSET(n) (!! (n & KEYBD_MASK)) /* keyboard used? */
56#define MOUSE_ISSET(n) (!! (n & MOUSE_MASK)) /* mouse used? */
57
58#define INIT_TIMEOUT_MSECS 4000 /* wait up to 4s for device init ... */
59#define INIT_WAIT_MSECS 200 /* ... in 200ms increments */
60
Robert Love393ad292005-09-16 19:28:07 -070061#define HDAPS_POLL_PERIOD (HZ/20) /* poll for input every 1/20s */
62#define HDAPS_INPUT_FUZZ 4 /* input event threshold */
63
Robert Love860e1d62005-08-31 23:57:59 -040064static struct timer_list hdaps_timer;
Robert Love393ad292005-09-16 19:28:07 -070065static struct platform_device *pdev;
Robert Love860e1d62005-08-31 23:57:59 -040066static unsigned int hdaps_invert;
67static u8 km_activity;
68static int rest_x;
69static int rest_y;
70
71static DECLARE_MUTEX(hdaps_sem);
72
73/*
74 * __get_latch - Get the value from a given port. Callers must hold hdaps_sem.
75 */
76static inline u8 __get_latch(u16 port)
77{
Robert Love393ad292005-09-16 19:28:07 -070078 return inb(port) & 0xff;
Robert Love860e1d62005-08-31 23:57:59 -040079}
80
81/*
Robert Love393ad292005-09-16 19:28:07 -070082 * __check_latch - Check a port latch for a given value. Returns zero if the
83 * port contains the given value. Callers must hold hdaps_sem.
Robert Love860e1d62005-08-31 23:57:59 -040084 */
Robert Love393ad292005-09-16 19:28:07 -070085static inline int __check_latch(u16 port, u8 val)
Robert Love860e1d62005-08-31 23:57:59 -040086{
87 if (__get_latch(port) == val)
88 return 0;
89 return -EINVAL;
90}
91
92/*
93 * __wait_latch - Wait up to 100us for a port latch to get a certain value,
94 * returning zero if the value is obtained. Callers must hold hdaps_sem.
95 */
Robert Love393ad292005-09-16 19:28:07 -070096static int __wait_latch(u16 port, u8 val)
Robert Love860e1d62005-08-31 23:57:59 -040097{
98 unsigned int i;
99
100 for (i = 0; i < 20; i++) {
101 if (!__check_latch(port, val))
102 return 0;
103 udelay(5);
104 }
105
Robert Love393ad292005-09-16 19:28:07 -0700106 return -EIO;
Robert Love860e1d62005-08-31 23:57:59 -0400107}
108
109/*
Robert Love393ad292005-09-16 19:28:07 -0700110 * __device_refresh - request a refresh from the accelerometer. Does not wait
111 * for refresh to complete. Callers must hold hdaps_sem.
Robert Love860e1d62005-08-31 23:57:59 -0400112 */
Robert Love393ad292005-09-16 19:28:07 -0700113static void __device_refresh(void)
Robert Love860e1d62005-08-31 23:57:59 -0400114{
Robert Love393ad292005-09-16 19:28:07 -0700115 udelay(200);
116 if (inb(0x1604) != STATE_FRESH) {
117 outb(0x11, 0x1610);
118 outb(0x01, 0x161f);
119 }
120}
Robert Love860e1d62005-08-31 23:57:59 -0400121
Robert Love393ad292005-09-16 19:28:07 -0700122/*
123 * __device_refresh_sync - request a synchronous refresh from the
124 * accelerometer. We wait for the refresh to complete. Returns zero if
125 * successful and nonzero on error. Callers must hold hdaps_sem.
126 */
127static int __device_refresh_sync(void)
128{
129 __device_refresh();
Robert Love860e1d62005-08-31 23:57:59 -0400130 return __wait_latch(0x1604, STATE_FRESH);
131}
132
133/*
Robert Love393ad292005-09-16 19:28:07 -0700134 * __device_complete - indicate to the accelerometer that we are done reading
Robert Love860e1d62005-08-31 23:57:59 -0400135 * data, and then initiate an async refresh. Callers must hold hdaps_sem.
136 */
137static inline void __device_complete(void)
138{
139 inb(0x161f);
140 inb(0x1604);
Robert Love393ad292005-09-16 19:28:07 -0700141 __device_refresh();
Robert Love860e1d62005-08-31 23:57:59 -0400142}
143
144/*
145 * hdaps_readb_one - reads a byte from a single I/O port, placing the value in
146 * the given pointer. Returns zero on success or a negative error on failure.
147 * Can sleep.
148 */
149static int hdaps_readb_one(unsigned int port, u8 *val)
150{
151 int ret;
152
153 down(&hdaps_sem);
Robert Love860e1d62005-08-31 23:57:59 -0400154
Robert Love393ad292005-09-16 19:28:07 -0700155 /* do a sync refresh -- we need to be sure that we read fresh data */
156 ret = __device_refresh_sync();
157 if (ret)
158 goto out;
159
160 *val = inb(port);
161 __device_complete();
162
163out:
164 up(&hdaps_sem);
Robert Love860e1d62005-08-31 23:57:59 -0400165 return ret;
166}
167
Robert Love393ad292005-09-16 19:28:07 -0700168/* __hdaps_read_pair - internal lockless helper for hdaps_read_pair(). */
Robert Love860e1d62005-08-31 23:57:59 -0400169static int __hdaps_read_pair(unsigned int port1, unsigned int port2,
170 int *x, int *y)
171{
172 /* do a sync refresh -- we need to be sure that we read fresh data */
Robert Love393ad292005-09-16 19:28:07 -0700173 if (__device_refresh_sync())
Robert Love860e1d62005-08-31 23:57:59 -0400174 return -EIO;
175
176 *y = inw(port2);
177 *x = inw(port1);
178 km_activity = inb(HDAPS_PORT_KMACT);
179 __device_complete();
180
181 /* if hdaps_invert is set, negate the two values */
182 if (hdaps_invert) {
183 *x = -*x;
184 *y = -*y;
185 }
186
187 return 0;
188}
189
190/*
191 * hdaps_read_pair - reads the values from a pair of ports, placing the values
192 * in the given pointers. Returns zero on success. Can sleep.
193 */
194static int hdaps_read_pair(unsigned int port1, unsigned int port2,
195 int *val1, int *val2)
196{
197 int ret;
198
199 down(&hdaps_sem);
200 ret = __hdaps_read_pair(port1, port2, val1, val2);
201 up(&hdaps_sem);
202
203 return ret;
204}
205
Robert Love393ad292005-09-16 19:28:07 -0700206/*
207 * hdaps_device_init - initialize the accelerometer. Returns zero on success
208 * and negative error code on failure. Can sleep.
209 */
Robert Love860e1d62005-08-31 23:57:59 -0400210static int hdaps_device_init(void)
211{
Robert Love393ad292005-09-16 19:28:07 -0700212 int total, ret = -ENXIO;
Robert Love860e1d62005-08-31 23:57:59 -0400213
214 down(&hdaps_sem);
215
216 outb(0x13, 0x1610);
217 outb(0x01, 0x161f);
218 if (__wait_latch(0x161f, 0x00))
219 goto out;
220
221 /*
Robert Love393ad292005-09-16 19:28:07 -0700222 * Most ThinkPads return 0x01.
223 *
224 * Others--namely the R50p, T41p, and T42p--return 0x03. These laptops
225 * have "inverted" axises.
Robert Love860e1d62005-08-31 23:57:59 -0400226 *
227 * The 0x02 value occurs when the chip has been previously initialized.
228 */
229 if (__check_latch(0x1611, 0x03) &&
230 __check_latch(0x1611, 0x02) &&
231 __check_latch(0x1611, 0x01))
232 goto out;
233
234 printk(KERN_DEBUG "hdaps: initial latch check good (0x%02x).\n",
235 __get_latch(0x1611));
236
237 outb(0x17, 0x1610);
238 outb(0x81, 0x1611);
239 outb(0x01, 0x161f);
240 if (__wait_latch(0x161f, 0x00))
241 goto out;
242 if (__wait_latch(0x1611, 0x00))
243 goto out;
244 if (__wait_latch(0x1612, 0x60))
245 goto out;
246 if (__wait_latch(0x1613, 0x00))
247 goto out;
248 outb(0x14, 0x1610);
249 outb(0x01, 0x1611);
250 outb(0x01, 0x161f);
251 if (__wait_latch(0x161f, 0x00))
252 goto out;
253 outb(0x10, 0x1610);
254 outb(0xc8, 0x1611);
255 outb(0x00, 0x1612);
256 outb(0x02, 0x1613);
257 outb(0x01, 0x161f);
258 if (__wait_latch(0x161f, 0x00))
259 goto out;
Robert Love393ad292005-09-16 19:28:07 -0700260 if (__device_refresh_sync())
Robert Love860e1d62005-08-31 23:57:59 -0400261 goto out;
262 if (__wait_latch(0x1611, 0x00))
263 goto out;
264
265 /* we have done our dance, now let's wait for the applause */
Robert Love393ad292005-09-16 19:28:07 -0700266 for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
267 int x, y;
Robert Love860e1d62005-08-31 23:57:59 -0400268
269 /* a read of the device helps push it into action */
Robert Love393ad292005-09-16 19:28:07 -0700270 __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
Robert Love860e1d62005-08-31 23:57:59 -0400271 if (!__wait_latch(0x1611, 0x02)) {
272 ret = 0;
273 break;
274 }
275
276 msleep(INIT_WAIT_MSECS);
Robert Love860e1d62005-08-31 23:57:59 -0400277 }
278
279out:
280 up(&hdaps_sem);
281 return ret;
282}
283
284
Robert Love860e1d62005-08-31 23:57:59 -0400285/* Device model stuff */
286
287static int hdaps_probe(struct device *dev)
288{
289 int ret;
290
291 ret = hdaps_device_init();
292 if (ret)
293 return ret;
294
295 printk(KERN_INFO "hdaps: device successfully initialized.\n");
296 return 0;
297}
298
Russell King9480e302005-10-28 09:52:56 -0700299static int hdaps_resume(struct device *dev)
Robert Love860e1d62005-08-31 23:57:59 -0400300{
Russell King9480e302005-10-28 09:52:56 -0700301 return hdaps_device_init();
Robert Love860e1d62005-08-31 23:57:59 -0400302}
303
304static struct device_driver hdaps_driver = {
305 .name = "hdaps",
306 .bus = &platform_bus_type,
307 .owner = THIS_MODULE,
308 .probe = hdaps_probe,
309 .resume = hdaps_resume
310};
311
Robert Love393ad292005-09-16 19:28:07 -0700312/* Input class stuff */
313
314static struct input_dev hdaps_idev = {
315 .name = "hdaps",
316 .evbit = { BIT(EV_ABS) },
317 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
318 .absmin = { [ABS_X] = -256, [ABS_Y] = -256 },
319 .absmax = { [ABS_X] = 256, [ABS_Y] = 256 },
320 .absfuzz = { [ABS_X] = HDAPS_INPUT_FUZZ, [ABS_Y] = HDAPS_INPUT_FUZZ },
321 .absflat = { [ABS_X] = HDAPS_INPUT_FUZZ, [ABS_Y] = HDAPS_INPUT_FUZZ },
322};
323
324/*
325 * hdaps_calibrate - Set our "resting" values. Callers must hold hdaps_sem.
326 */
327static void hdaps_calibrate(void)
328{
329 __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &rest_x, &rest_y);
330}
331
332static void hdaps_mousedev_poll(unsigned long unused)
333{
334 int x, y;
335
336 /* Cannot sleep. Try nonblockingly. If we fail, try again later. */
337 if (down_trylock(&hdaps_sem)) {
338 mod_timer(&hdaps_timer,jiffies + HDAPS_POLL_PERIOD);
339 return;
340 }
341
342 if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y))
343 goto out;
344
345 input_report_abs(&hdaps_idev, ABS_X, x - rest_x);
346 input_report_abs(&hdaps_idev, ABS_Y, y - rest_y);
347 input_sync(&hdaps_idev);
348
349 mod_timer(&hdaps_timer, jiffies + HDAPS_POLL_PERIOD);
350
351out:
352 up(&hdaps_sem);
353}
354
Robert Love860e1d62005-08-31 23:57:59 -0400355
356/* Sysfs Files */
357
358static ssize_t hdaps_position_show(struct device *dev,
359 struct device_attribute *attr, char *buf)
360{
361 int ret, x, y;
362
363 ret = hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
364 if (ret)
365 return ret;
366
367 return sprintf(buf, "(%d,%d)\n", x, y);
368}
369
370static ssize_t hdaps_variance_show(struct device *dev,
371 struct device_attribute *attr, char *buf)
372{
373 int ret, x, y;
374
375 ret = hdaps_read_pair(HDAPS_PORT_XVAR, HDAPS_PORT_YVAR, &x, &y);
376 if (ret)
377 return ret;
378
379 return sprintf(buf, "(%d,%d)\n", x, y);
380}
381
382static ssize_t hdaps_temp1_show(struct device *dev,
383 struct device_attribute *attr, char *buf)
384{
385 u8 temp;
386 int ret;
387
388 ret = hdaps_readb_one(HDAPS_PORT_TEMP1, &temp);
389 if (ret < 0)
390 return ret;
391
392 return sprintf(buf, "%u\n", temp);
393}
394
395static ssize_t hdaps_temp2_show(struct device *dev,
396 struct device_attribute *attr, char *buf)
397{
398 u8 temp;
399 int ret;
400
401 ret = hdaps_readb_one(HDAPS_PORT_TEMP2, &temp);
402 if (ret < 0)
403 return ret;
404
405 return sprintf(buf, "%u\n", temp);
406}
407
408static ssize_t hdaps_keyboard_activity_show(struct device *dev,
409 struct device_attribute *attr,
410 char *buf)
411{
412 return sprintf(buf, "%u\n", KEYBD_ISSET(km_activity));
413}
414
415static ssize_t hdaps_mouse_activity_show(struct device *dev,
416 struct device_attribute *attr,
417 char *buf)
418{
419 return sprintf(buf, "%u\n", MOUSE_ISSET(km_activity));
420}
421
422static ssize_t hdaps_calibrate_show(struct device *dev,
423 struct device_attribute *attr, char *buf)
424{
425 return sprintf(buf, "(%d,%d)\n", rest_x, rest_y);
426}
427
428static ssize_t hdaps_calibrate_store(struct device *dev,
429 struct device_attribute *attr,
430 const char *buf, size_t count)
431{
432 down(&hdaps_sem);
433 hdaps_calibrate();
434 up(&hdaps_sem);
435
436 return count;
437}
438
439static ssize_t hdaps_invert_show(struct device *dev,
440 struct device_attribute *attr, char *buf)
441{
442 return sprintf(buf, "%u\n", hdaps_invert);
443}
444
445static ssize_t hdaps_invert_store(struct device *dev,
446 struct device_attribute *attr,
447 const char *buf, size_t count)
448{
449 int invert;
450
451 if (sscanf(buf, "%d", &invert) != 1 || (invert != 1 && invert != 0))
452 return -EINVAL;
453
454 hdaps_invert = invert;
455 hdaps_calibrate();
456
457 return count;
458}
459
Robert Love860e1d62005-08-31 23:57:59 -0400460static DEVICE_ATTR(position, 0444, hdaps_position_show, NULL);
461static DEVICE_ATTR(variance, 0444, hdaps_variance_show, NULL);
462static DEVICE_ATTR(temp1, 0444, hdaps_temp1_show, NULL);
463static DEVICE_ATTR(temp2, 0444, hdaps_temp2_show, NULL);
464static DEVICE_ATTR(keyboard_activity, 0444, hdaps_keyboard_activity_show, NULL);
465static DEVICE_ATTR(mouse_activity, 0444, hdaps_mouse_activity_show, NULL);
466static DEVICE_ATTR(calibrate, 0644, hdaps_calibrate_show,hdaps_calibrate_store);
467static DEVICE_ATTR(invert, 0644, hdaps_invert_show, hdaps_invert_store);
Robert Love860e1d62005-08-31 23:57:59 -0400468
469static struct attribute *hdaps_attributes[] = {
470 &dev_attr_position.attr,
471 &dev_attr_variance.attr,
472 &dev_attr_temp1.attr,
473 &dev_attr_temp2.attr,
474 &dev_attr_keyboard_activity.attr,
475 &dev_attr_mouse_activity.attr,
476 &dev_attr_calibrate.attr,
Robert Love860e1d62005-08-31 23:57:59 -0400477 &dev_attr_invert.attr,
478 NULL,
479};
480
481static struct attribute_group hdaps_attribute_group = {
482 .attrs = hdaps_attributes,
483};
484
485
486/* Module stuff */
487
Robert Love4c87b742005-09-22 21:44:00 -0700488/* hdaps_dmi_match - found a match. return one, short-circuiting the hunt. */
Robert Love860e1d62005-08-31 23:57:59 -0400489static int hdaps_dmi_match(struct dmi_system_id *id)
490{
491 printk(KERN_INFO "hdaps: %s detected.\n", id->ident);
Robert Love4c87b742005-09-22 21:44:00 -0700492 return 1;
Robert Love860e1d62005-08-31 23:57:59 -0400493}
494
Robert Love4c87b742005-09-22 21:44:00 -0700495/* hdaps_dmi_match_invert - found an inverted match. */
Robert Love860e1d62005-08-31 23:57:59 -0400496static int hdaps_dmi_match_invert(struct dmi_system_id *id)
497{
498 hdaps_invert = 1;
499 printk(KERN_INFO "hdaps: inverting axis readings.\n");
Robert Love4c87b742005-09-22 21:44:00 -0700500 return hdaps_dmi_match(id);
Robert Love860e1d62005-08-31 23:57:59 -0400501}
502
503#define HDAPS_DMI_MATCH_NORMAL(model) { \
504 .ident = "IBM " model, \
505 .callback = hdaps_dmi_match, \
506 .matches = { \
507 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), \
508 DMI_MATCH(DMI_PRODUCT_VERSION, model) \
509 } \
510}
511
512#define HDAPS_DMI_MATCH_INVERT(model) { \
513 .ident = "IBM " model, \
514 .callback = hdaps_dmi_match_invert, \
515 .matches = { \
516 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), \
517 DMI_MATCH(DMI_PRODUCT_VERSION, model) \
518 } \
519}
520
521static int __init hdaps_init(void)
522{
523 int ret;
524
525 /* Note that DMI_MATCH(...,"ThinkPad T42") will match "ThinkPad T42p" */
526 struct dmi_system_id hdaps_whitelist[] = {
527 HDAPS_DMI_MATCH_INVERT("ThinkPad R50p"),
528 HDAPS_DMI_MATCH_NORMAL("ThinkPad R50"),
529 HDAPS_DMI_MATCH_NORMAL("ThinkPad R51"),
Robert Love4c87b742005-09-22 21:44:00 -0700530 HDAPS_DMI_MATCH_NORMAL("ThinkPad R52"),
Robert Love860e1d62005-08-31 23:57:59 -0400531 HDAPS_DMI_MATCH_INVERT("ThinkPad T41p"),
532 HDAPS_DMI_MATCH_NORMAL("ThinkPad T41"),
533 HDAPS_DMI_MATCH_INVERT("ThinkPad T42p"),
534 HDAPS_DMI_MATCH_NORMAL("ThinkPad T42"),
535 HDAPS_DMI_MATCH_NORMAL("ThinkPad T43"),
536 HDAPS_DMI_MATCH_NORMAL("ThinkPad X40"),
Robert Love393ad292005-09-16 19:28:07 -0700537 HDAPS_DMI_MATCH_NORMAL("ThinkPad X41 Tablet"),
Robert Love4c87b742005-09-22 21:44:00 -0700538 HDAPS_DMI_MATCH_NORMAL("ThinkPad X41"),
Robert Love860e1d62005-08-31 23:57:59 -0400539 { .ident = NULL }
540 };
541
542 if (!dmi_check_system(hdaps_whitelist)) {
543 printk(KERN_WARNING "hdaps: supported laptop not found!\n");
544 ret = -ENXIO;
545 goto out;
546 }
547
548 if (!request_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS, "hdaps")) {
549 ret = -ENXIO;
550 goto out;
551 }
552
553 ret = driver_register(&hdaps_driver);
554 if (ret)
555 goto out_region;
556
557 pdev = platform_device_register_simple("hdaps", -1, NULL, 0);
558 if (IS_ERR(pdev)) {
559 ret = PTR_ERR(pdev);
560 goto out_driver;
561 }
562
563 ret = sysfs_create_group(&pdev->dev.kobj, &hdaps_attribute_group);
564 if (ret)
565 goto out_device;
566
Robert Love393ad292005-09-16 19:28:07 -0700567 /* initial calibrate for the input device */
568 hdaps_calibrate();
569
570 /* initialize the input class */
571 hdaps_idev.dev = &pdev->dev;
572 input_register_device(&hdaps_idev);
573
574 /* start up our timer for the input device */
575 init_timer(&hdaps_timer);
576 hdaps_timer.function = hdaps_mousedev_poll;
577 hdaps_timer.expires = jiffies + HDAPS_POLL_PERIOD;
578 add_timer(&hdaps_timer);
Robert Love860e1d62005-08-31 23:57:59 -0400579
580 printk(KERN_INFO "hdaps: driver successfully loaded.\n");
581 return 0;
582
583out_device:
584 platform_device_unregister(pdev);
585out_driver:
586 driver_unregister(&hdaps_driver);
587out_region:
588 release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS);
589out:
590 printk(KERN_WARNING "hdaps: driver init failed (ret=%d)!\n", ret);
591 return ret;
592}
593
594static void __exit hdaps_exit(void)
595{
Robert Love393ad292005-09-16 19:28:07 -0700596 del_timer_sync(&hdaps_timer);
597 input_unregister_device(&hdaps_idev);
Robert Love860e1d62005-08-31 23:57:59 -0400598 sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group);
599 platform_device_unregister(pdev);
600 driver_unregister(&hdaps_driver);
601 release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS);
602
603 printk(KERN_INFO "hdaps: driver unloaded.\n");
604}
605
606module_init(hdaps_init);
607module_exit(hdaps_exit);
608
Robert Love860e1d62005-08-31 23:57:59 -0400609module_param_named(invert, hdaps_invert, bool, 0);
610MODULE_PARM_DESC(invert, "invert data along each axis");
611
612MODULE_AUTHOR("Robert Love");
613MODULE_DESCRIPTION("IBM Hard Drive Active Protection System (HDAPS) driver");
614MODULE_LICENSE("GPL v2");