blob: 23a9e1ea8e321e218acc42de271e8e157191764f [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>
Russell Kingd052d1b2005-10-29 19:07:23 +010030#include <linux/platform_device.h>
Robert Love860e1d62005-08-31 23:57:59 -040031#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 */
Dmitry Torokhovd12eb7e2005-11-10 22:10:55 -050063#define HDAPS_INPUT_FLAT 4
Robert Love393ad292005-09-16 19:28:07 -070064
Robert Love860e1d62005-08-31 23:57:59 -040065static struct timer_list hdaps_timer;
Robert Love393ad292005-09-16 19:28:07 -070066static struct platform_device *pdev;
Dmitry Torokhovd12eb7e2005-11-10 22:10:55 -050067static struct input_dev *hdaps_idev;
Robert Love860e1d62005-08-31 23:57:59 -040068static unsigned int hdaps_invert;
69static u8 km_activity;
70static int rest_x;
71static int rest_y;
72
73static DECLARE_MUTEX(hdaps_sem);
74
75/*
76 * __get_latch - Get the value from a given port. Callers must hold hdaps_sem.
77 */
78static inline u8 __get_latch(u16 port)
79{
Robert Love393ad292005-09-16 19:28:07 -070080 return inb(port) & 0xff;
Robert Love860e1d62005-08-31 23:57:59 -040081}
82
83/*
Robert Love393ad292005-09-16 19:28:07 -070084 * __check_latch - Check a port latch for a given value. Returns zero if the
85 * port contains the given value. Callers must hold hdaps_sem.
Robert Love860e1d62005-08-31 23:57:59 -040086 */
Robert Love393ad292005-09-16 19:28:07 -070087static inline int __check_latch(u16 port, u8 val)
Robert Love860e1d62005-08-31 23:57:59 -040088{
89 if (__get_latch(port) == val)
90 return 0;
91 return -EINVAL;
92}
93
94/*
95 * __wait_latch - Wait up to 100us for a port latch to get a certain value,
96 * returning zero if the value is obtained. Callers must hold hdaps_sem.
97 */
Robert Love393ad292005-09-16 19:28:07 -070098static int __wait_latch(u16 port, u8 val)
Robert Love860e1d62005-08-31 23:57:59 -040099{
100 unsigned int i;
101
102 for (i = 0; i < 20; i++) {
103 if (!__check_latch(port, val))
104 return 0;
105 udelay(5);
106 }
107
Robert Love393ad292005-09-16 19:28:07 -0700108 return -EIO;
Robert Love860e1d62005-08-31 23:57:59 -0400109}
110
111/*
Robert Love393ad292005-09-16 19:28:07 -0700112 * __device_refresh - request a refresh from the accelerometer. Does not wait
113 * for refresh to complete. Callers must hold hdaps_sem.
Robert Love860e1d62005-08-31 23:57:59 -0400114 */
Robert Love393ad292005-09-16 19:28:07 -0700115static void __device_refresh(void)
Robert Love860e1d62005-08-31 23:57:59 -0400116{
Robert Love393ad292005-09-16 19:28:07 -0700117 udelay(200);
118 if (inb(0x1604) != STATE_FRESH) {
119 outb(0x11, 0x1610);
120 outb(0x01, 0x161f);
121 }
122}
Robert Love860e1d62005-08-31 23:57:59 -0400123
Robert Love393ad292005-09-16 19:28:07 -0700124/*
125 * __device_refresh_sync - request a synchronous refresh from the
126 * accelerometer. We wait for the refresh to complete. Returns zero if
127 * successful and nonzero on error. Callers must hold hdaps_sem.
128 */
129static int __device_refresh_sync(void)
130{
131 __device_refresh();
Robert Love860e1d62005-08-31 23:57:59 -0400132 return __wait_latch(0x1604, STATE_FRESH);
133}
134
135/*
Robert Love393ad292005-09-16 19:28:07 -0700136 * __device_complete - indicate to the accelerometer that we are done reading
Robert Love860e1d62005-08-31 23:57:59 -0400137 * data, and then initiate an async refresh. Callers must hold hdaps_sem.
138 */
139static inline void __device_complete(void)
140{
141 inb(0x161f);
142 inb(0x1604);
Robert Love393ad292005-09-16 19:28:07 -0700143 __device_refresh();
Robert Love860e1d62005-08-31 23:57:59 -0400144}
145
146/*
147 * hdaps_readb_one - reads a byte from a single I/O port, placing the value in
148 * the given pointer. Returns zero on success or a negative error on failure.
149 * Can sleep.
150 */
151static int hdaps_readb_one(unsigned int port, u8 *val)
152{
153 int ret;
154
155 down(&hdaps_sem);
Robert Love860e1d62005-08-31 23:57:59 -0400156
Robert Love393ad292005-09-16 19:28:07 -0700157 /* do a sync refresh -- we need to be sure that we read fresh data */
158 ret = __device_refresh_sync();
159 if (ret)
160 goto out;
161
162 *val = inb(port);
163 __device_complete();
164
165out:
166 up(&hdaps_sem);
Robert Love860e1d62005-08-31 23:57:59 -0400167 return ret;
168}
169
Robert Love393ad292005-09-16 19:28:07 -0700170/* __hdaps_read_pair - internal lockless helper for hdaps_read_pair(). */
Robert Love860e1d62005-08-31 23:57:59 -0400171static int __hdaps_read_pair(unsigned int port1, unsigned int port2,
172 int *x, int *y)
173{
174 /* do a sync refresh -- we need to be sure that we read fresh data */
Robert Love393ad292005-09-16 19:28:07 -0700175 if (__device_refresh_sync())
Robert Love860e1d62005-08-31 23:57:59 -0400176 return -EIO;
177
178 *y = inw(port2);
179 *x = inw(port1);
180 km_activity = inb(HDAPS_PORT_KMACT);
181 __device_complete();
182
183 /* if hdaps_invert is set, negate the two values */
184 if (hdaps_invert) {
185 *x = -*x;
186 *y = -*y;
187 }
188
189 return 0;
190}
191
192/*
193 * hdaps_read_pair - reads the values from a pair of ports, placing the values
194 * in the given pointers. Returns zero on success. Can sleep.
195 */
196static int hdaps_read_pair(unsigned int port1, unsigned int port2,
197 int *val1, int *val2)
198{
199 int ret;
200
201 down(&hdaps_sem);
202 ret = __hdaps_read_pair(port1, port2, val1, val2);
203 up(&hdaps_sem);
204
205 return ret;
206}
207
Robert Love393ad292005-09-16 19:28:07 -0700208/*
209 * hdaps_device_init - initialize the accelerometer. Returns zero on success
210 * and negative error code on failure. Can sleep.
211 */
Robert Love860e1d62005-08-31 23:57:59 -0400212static int hdaps_device_init(void)
213{
Robert Love393ad292005-09-16 19:28:07 -0700214 int total, ret = -ENXIO;
Robert Love860e1d62005-08-31 23:57:59 -0400215
216 down(&hdaps_sem);
217
218 outb(0x13, 0x1610);
219 outb(0x01, 0x161f);
220 if (__wait_latch(0x161f, 0x00))
221 goto out;
222
223 /*
Robert Love393ad292005-09-16 19:28:07 -0700224 * Most ThinkPads return 0x01.
225 *
226 * Others--namely the R50p, T41p, and T42p--return 0x03. These laptops
227 * have "inverted" axises.
Robert Love860e1d62005-08-31 23:57:59 -0400228 *
229 * The 0x02 value occurs when the chip has been previously initialized.
230 */
231 if (__check_latch(0x1611, 0x03) &&
232 __check_latch(0x1611, 0x02) &&
233 __check_latch(0x1611, 0x01))
234 goto out;
235
236 printk(KERN_DEBUG "hdaps: initial latch check good (0x%02x).\n",
237 __get_latch(0x1611));
238
239 outb(0x17, 0x1610);
240 outb(0x81, 0x1611);
241 outb(0x01, 0x161f);
242 if (__wait_latch(0x161f, 0x00))
243 goto out;
244 if (__wait_latch(0x1611, 0x00))
245 goto out;
246 if (__wait_latch(0x1612, 0x60))
247 goto out;
248 if (__wait_latch(0x1613, 0x00))
249 goto out;
250 outb(0x14, 0x1610);
251 outb(0x01, 0x1611);
252 outb(0x01, 0x161f);
253 if (__wait_latch(0x161f, 0x00))
254 goto out;
255 outb(0x10, 0x1610);
256 outb(0xc8, 0x1611);
257 outb(0x00, 0x1612);
258 outb(0x02, 0x1613);
259 outb(0x01, 0x161f);
260 if (__wait_latch(0x161f, 0x00))
261 goto out;
Robert Love393ad292005-09-16 19:28:07 -0700262 if (__device_refresh_sync())
Robert Love860e1d62005-08-31 23:57:59 -0400263 goto out;
264 if (__wait_latch(0x1611, 0x00))
265 goto out;
266
267 /* we have done our dance, now let's wait for the applause */
Robert Love393ad292005-09-16 19:28:07 -0700268 for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
269 int x, y;
Robert Love860e1d62005-08-31 23:57:59 -0400270
271 /* a read of the device helps push it into action */
Robert Love393ad292005-09-16 19:28:07 -0700272 __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
Robert Love860e1d62005-08-31 23:57:59 -0400273 if (!__wait_latch(0x1611, 0x02)) {
274 ret = 0;
275 break;
276 }
277
278 msleep(INIT_WAIT_MSECS);
Robert Love860e1d62005-08-31 23:57:59 -0400279 }
280
281out:
282 up(&hdaps_sem);
283 return ret;
284}
285
286
Robert Love860e1d62005-08-31 23:57:59 -0400287/* Device model stuff */
288
Russell King3ae5eae2005-11-09 22:32:44 +0000289static int hdaps_probe(struct platform_device *dev)
Robert Love860e1d62005-08-31 23:57:59 -0400290{
291 int ret;
292
293 ret = hdaps_device_init();
294 if (ret)
295 return ret;
296
297 printk(KERN_INFO "hdaps: device successfully initialized.\n");
298 return 0;
299}
300
Russell King3ae5eae2005-11-09 22:32:44 +0000301static int hdaps_resume(struct platform_device *dev)
Robert Love860e1d62005-08-31 23:57:59 -0400302{
Russell King9480e302005-10-28 09:52:56 -0700303 return hdaps_device_init();
Robert Love860e1d62005-08-31 23:57:59 -0400304}
305
Russell King3ae5eae2005-11-09 22:32:44 +0000306static struct platform_driver hdaps_driver = {
Robert Love860e1d62005-08-31 23:57:59 -0400307 .probe = hdaps_probe,
Russell King3ae5eae2005-11-09 22:32:44 +0000308 .resume = hdaps_resume,
309 .driver = {
310 .name = "hdaps",
311 .owner = THIS_MODULE,
312 },
Robert Love860e1d62005-08-31 23:57:59 -0400313};
314
Robert Love393ad292005-09-16 19:28:07 -0700315/*
316 * hdaps_calibrate - Set our "resting" values. Callers must hold hdaps_sem.
317 */
318static void hdaps_calibrate(void)
319{
320 __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &rest_x, &rest_y);
321}
322
323static void hdaps_mousedev_poll(unsigned long unused)
324{
325 int x, y;
326
327 /* Cannot sleep. Try nonblockingly. If we fail, try again later. */
328 if (down_trylock(&hdaps_sem)) {
329 mod_timer(&hdaps_timer,jiffies + HDAPS_POLL_PERIOD);
330 return;
331 }
332
333 if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y))
334 goto out;
335
Dmitry Torokhovd12eb7e2005-11-10 22:10:55 -0500336 input_report_abs(hdaps_idev, ABS_X, x - rest_x);
337 input_report_abs(hdaps_idev, ABS_Y, y - rest_y);
338 input_sync(hdaps_idev);
Robert Love393ad292005-09-16 19:28:07 -0700339
340 mod_timer(&hdaps_timer, jiffies + HDAPS_POLL_PERIOD);
341
342out:
343 up(&hdaps_sem);
344}
345
Robert Love860e1d62005-08-31 23:57:59 -0400346
347/* Sysfs Files */
348
349static ssize_t hdaps_position_show(struct device *dev,
350 struct device_attribute *attr, char *buf)
351{
352 int ret, x, y;
353
354 ret = hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
355 if (ret)
356 return ret;
357
358 return sprintf(buf, "(%d,%d)\n", x, y);
359}
360
361static ssize_t hdaps_variance_show(struct device *dev,
362 struct device_attribute *attr, char *buf)
363{
364 int ret, x, y;
365
366 ret = hdaps_read_pair(HDAPS_PORT_XVAR, HDAPS_PORT_YVAR, &x, &y);
367 if (ret)
368 return ret;
369
370 return sprintf(buf, "(%d,%d)\n", x, y);
371}
372
373static ssize_t hdaps_temp1_show(struct device *dev,
374 struct device_attribute *attr, char *buf)
375{
376 u8 temp;
377 int ret;
378
379 ret = hdaps_readb_one(HDAPS_PORT_TEMP1, &temp);
380 if (ret < 0)
381 return ret;
382
383 return sprintf(buf, "%u\n", temp);
384}
385
386static ssize_t hdaps_temp2_show(struct device *dev,
387 struct device_attribute *attr, char *buf)
388{
389 u8 temp;
390 int ret;
391
392 ret = hdaps_readb_one(HDAPS_PORT_TEMP2, &temp);
393 if (ret < 0)
394 return ret;
395
396 return sprintf(buf, "%u\n", temp);
397}
398
399static ssize_t hdaps_keyboard_activity_show(struct device *dev,
400 struct device_attribute *attr,
401 char *buf)
402{
403 return sprintf(buf, "%u\n", KEYBD_ISSET(km_activity));
404}
405
406static ssize_t hdaps_mouse_activity_show(struct device *dev,
407 struct device_attribute *attr,
408 char *buf)
409{
410 return sprintf(buf, "%u\n", MOUSE_ISSET(km_activity));
411}
412
413static ssize_t hdaps_calibrate_show(struct device *dev,
414 struct device_attribute *attr, char *buf)
415{
416 return sprintf(buf, "(%d,%d)\n", rest_x, rest_y);
417}
418
419static ssize_t hdaps_calibrate_store(struct device *dev,
420 struct device_attribute *attr,
421 const char *buf, size_t count)
422{
423 down(&hdaps_sem);
424 hdaps_calibrate();
425 up(&hdaps_sem);
426
427 return count;
428}
429
430static ssize_t hdaps_invert_show(struct device *dev,
431 struct device_attribute *attr, char *buf)
432{
433 return sprintf(buf, "%u\n", hdaps_invert);
434}
435
436static ssize_t hdaps_invert_store(struct device *dev,
437 struct device_attribute *attr,
438 const char *buf, size_t count)
439{
440 int invert;
441
442 if (sscanf(buf, "%d", &invert) != 1 || (invert != 1 && invert != 0))
443 return -EINVAL;
444
445 hdaps_invert = invert;
446 hdaps_calibrate();
447
448 return count;
449}
450
Robert Love860e1d62005-08-31 23:57:59 -0400451static DEVICE_ATTR(position, 0444, hdaps_position_show, NULL);
452static DEVICE_ATTR(variance, 0444, hdaps_variance_show, NULL);
453static DEVICE_ATTR(temp1, 0444, hdaps_temp1_show, NULL);
454static DEVICE_ATTR(temp2, 0444, hdaps_temp2_show, NULL);
455static DEVICE_ATTR(keyboard_activity, 0444, hdaps_keyboard_activity_show, NULL);
456static DEVICE_ATTR(mouse_activity, 0444, hdaps_mouse_activity_show, NULL);
457static DEVICE_ATTR(calibrate, 0644, hdaps_calibrate_show,hdaps_calibrate_store);
458static DEVICE_ATTR(invert, 0644, hdaps_invert_show, hdaps_invert_store);
Robert Love860e1d62005-08-31 23:57:59 -0400459
460static struct attribute *hdaps_attributes[] = {
461 &dev_attr_position.attr,
462 &dev_attr_variance.attr,
463 &dev_attr_temp1.attr,
464 &dev_attr_temp2.attr,
465 &dev_attr_keyboard_activity.attr,
466 &dev_attr_mouse_activity.attr,
467 &dev_attr_calibrate.attr,
Robert Love860e1d62005-08-31 23:57:59 -0400468 &dev_attr_invert.attr,
469 NULL,
470};
471
472static struct attribute_group hdaps_attribute_group = {
473 .attrs = hdaps_attributes,
474};
475
476
477/* Module stuff */
478
Robert Love4c87b742005-09-22 21:44:00 -0700479/* hdaps_dmi_match - found a match. return one, short-circuiting the hunt. */
Robert Love860e1d62005-08-31 23:57:59 -0400480static int hdaps_dmi_match(struct dmi_system_id *id)
481{
482 printk(KERN_INFO "hdaps: %s detected.\n", id->ident);
Robert Love4c87b742005-09-22 21:44:00 -0700483 return 1;
Robert Love860e1d62005-08-31 23:57:59 -0400484}
485
Robert Love4c87b742005-09-22 21:44:00 -0700486/* hdaps_dmi_match_invert - found an inverted match. */
Robert Love860e1d62005-08-31 23:57:59 -0400487static int hdaps_dmi_match_invert(struct dmi_system_id *id)
488{
489 hdaps_invert = 1;
490 printk(KERN_INFO "hdaps: inverting axis readings.\n");
Robert Love4c87b742005-09-22 21:44:00 -0700491 return hdaps_dmi_match(id);
Robert Love860e1d62005-08-31 23:57:59 -0400492}
493
494#define HDAPS_DMI_MATCH_NORMAL(model) { \
495 .ident = "IBM " model, \
496 .callback = hdaps_dmi_match, \
497 .matches = { \
498 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), \
499 DMI_MATCH(DMI_PRODUCT_VERSION, model) \
500 } \
501}
502
503#define HDAPS_DMI_MATCH_INVERT(model) { \
504 .ident = "IBM " model, \
505 .callback = hdaps_dmi_match_invert, \
506 .matches = { \
507 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), \
508 DMI_MATCH(DMI_PRODUCT_VERSION, model) \
509 } \
510}
511
512static int __init hdaps_init(void)
513{
514 int ret;
515
516 /* Note that DMI_MATCH(...,"ThinkPad T42") will match "ThinkPad T42p" */
517 struct dmi_system_id hdaps_whitelist[] = {
518 HDAPS_DMI_MATCH_INVERT("ThinkPad R50p"),
519 HDAPS_DMI_MATCH_NORMAL("ThinkPad R50"),
520 HDAPS_DMI_MATCH_NORMAL("ThinkPad R51"),
Robert Love4c87b742005-09-22 21:44:00 -0700521 HDAPS_DMI_MATCH_NORMAL("ThinkPad R52"),
Robert Love860e1d62005-08-31 23:57:59 -0400522 HDAPS_DMI_MATCH_INVERT("ThinkPad T41p"),
523 HDAPS_DMI_MATCH_NORMAL("ThinkPad T41"),
524 HDAPS_DMI_MATCH_INVERT("ThinkPad T42p"),
525 HDAPS_DMI_MATCH_NORMAL("ThinkPad T42"),
526 HDAPS_DMI_MATCH_NORMAL("ThinkPad T43"),
527 HDAPS_DMI_MATCH_NORMAL("ThinkPad X40"),
Robert Love393ad292005-09-16 19:28:07 -0700528 HDAPS_DMI_MATCH_NORMAL("ThinkPad X41 Tablet"),
Robert Love4c87b742005-09-22 21:44:00 -0700529 HDAPS_DMI_MATCH_NORMAL("ThinkPad X41"),
Robert Love860e1d62005-08-31 23:57:59 -0400530 { .ident = NULL }
531 };
532
533 if (!dmi_check_system(hdaps_whitelist)) {
534 printk(KERN_WARNING "hdaps: supported laptop not found!\n");
535 ret = -ENXIO;
536 goto out;
537 }
538
539 if (!request_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS, "hdaps")) {
540 ret = -ENXIO;
541 goto out;
542 }
543
Russell King3ae5eae2005-11-09 22:32:44 +0000544 ret = platform_driver_register(&hdaps_driver);
Robert Love860e1d62005-08-31 23:57:59 -0400545 if (ret)
546 goto out_region;
547
548 pdev = platform_device_register_simple("hdaps", -1, NULL, 0);
549 if (IS_ERR(pdev)) {
550 ret = PTR_ERR(pdev);
551 goto out_driver;
552 }
553
554 ret = sysfs_create_group(&pdev->dev.kobj, &hdaps_attribute_group);
555 if (ret)
556 goto out_device;
557
Dmitry Torokhovd12eb7e2005-11-10 22:10:55 -0500558 hdaps_idev = input_allocate_device();
559 if (!hdaps_idev) {
560 ret = -ENOMEM;
561 goto out_group;
562 }
563
Robert Love393ad292005-09-16 19:28:07 -0700564 /* initial calibrate for the input device */
565 hdaps_calibrate();
566
567 /* initialize the input class */
Dmitry Torokhovd12eb7e2005-11-10 22:10:55 -0500568 hdaps_idev->name = "hdaps";
569 hdaps_idev->cdev.dev = &pdev->dev;
570 hdaps_idev->evbit[0] = BIT(EV_ABS);
571 input_set_abs_params(hdaps_idev, ABS_X,
572 -256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT);
Eugeniy Meshcheryakov657a19e2005-11-23 15:44:35 -0800573 input_set_abs_params(hdaps_idev, ABS_Y,
Dmitry Torokhovd12eb7e2005-11-10 22:10:55 -0500574 -256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT);
575
576 input_register_device(hdaps_idev);
Robert Love393ad292005-09-16 19:28:07 -0700577
578 /* start up our timer for the input device */
579 init_timer(&hdaps_timer);
580 hdaps_timer.function = hdaps_mousedev_poll;
581 hdaps_timer.expires = jiffies + HDAPS_POLL_PERIOD;
582 add_timer(&hdaps_timer);
Robert Love860e1d62005-08-31 23:57:59 -0400583
584 printk(KERN_INFO "hdaps: driver successfully loaded.\n");
585 return 0;
586
Dmitry Torokhovd12eb7e2005-11-10 22:10:55 -0500587out_group:
588 sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group);
Robert Love860e1d62005-08-31 23:57:59 -0400589out_device:
590 platform_device_unregister(pdev);
591out_driver:
Russell King3ae5eae2005-11-09 22:32:44 +0000592 platform_driver_unregister(&hdaps_driver);
Robert Love860e1d62005-08-31 23:57:59 -0400593out_region:
594 release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS);
595out:
596 printk(KERN_WARNING "hdaps: driver init failed (ret=%d)!\n", ret);
597 return ret;
598}
599
600static void __exit hdaps_exit(void)
601{
Robert Love393ad292005-09-16 19:28:07 -0700602 del_timer_sync(&hdaps_timer);
Dmitry Torokhovd12eb7e2005-11-10 22:10:55 -0500603 input_unregister_device(hdaps_idev);
Robert Love860e1d62005-08-31 23:57:59 -0400604 sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group);
605 platform_device_unregister(pdev);
Russell King3ae5eae2005-11-09 22:32:44 +0000606 platform_driver_unregister(&hdaps_driver);
Robert Love860e1d62005-08-31 23:57:59 -0400607 release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS);
608
609 printk(KERN_INFO "hdaps: driver unloaded.\n");
610}
611
612module_init(hdaps_init);
613module_exit(hdaps_exit);
614
Robert Love860e1d62005-08-31 23:57:59 -0400615module_param_named(invert, hdaps_invert, bool, 0);
616MODULE_PARM_DESC(invert, "invert data along each axis");
617
618MODULE_AUTHOR("Robert Love");
619MODULE_DESCRIPTION("IBM Hard Drive Active Protection System (HDAPS) driver");
620MODULE_LICENSE("GPL v2");