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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 */
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
Russell King3ae5eae2005-11-09 22:32:44 +0000287static int hdaps_probe(struct platform_device *dev)
Robert Love860e1d62005-08-31 23:57:59 -0400288{
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 King3ae5eae2005-11-09 22:32:44 +0000299static int hdaps_resume(struct platform_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
Russell King3ae5eae2005-11-09 22:32:44 +0000304static struct platform_driver hdaps_driver = {
Robert Love860e1d62005-08-31 23:57:59 -0400305 .probe = hdaps_probe,
Russell King3ae5eae2005-11-09 22:32:44 +0000306 .resume = hdaps_resume,
307 .driver = {
308 .name = "hdaps",
309 .owner = THIS_MODULE,
310 },
Robert Love860e1d62005-08-31 23:57:59 -0400311};
312
Robert Love393ad292005-09-16 19:28:07 -0700313/* Input class stuff */
314
315static struct input_dev hdaps_idev = {
316 .name = "hdaps",
317 .evbit = { BIT(EV_ABS) },
318 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
319 .absmin = { [ABS_X] = -256, [ABS_Y] = -256 },
320 .absmax = { [ABS_X] = 256, [ABS_Y] = 256 },
321 .absfuzz = { [ABS_X] = HDAPS_INPUT_FUZZ, [ABS_Y] = HDAPS_INPUT_FUZZ },
322 .absflat = { [ABS_X] = HDAPS_INPUT_FUZZ, [ABS_Y] = HDAPS_INPUT_FUZZ },
323};
324
325/*
326 * hdaps_calibrate - Set our "resting" values. Callers must hold hdaps_sem.
327 */
328static void hdaps_calibrate(void)
329{
330 __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &rest_x, &rest_y);
331}
332
333static void hdaps_mousedev_poll(unsigned long unused)
334{
335 int x, y;
336
337 /* Cannot sleep. Try nonblockingly. If we fail, try again later. */
338 if (down_trylock(&hdaps_sem)) {
339 mod_timer(&hdaps_timer,jiffies + HDAPS_POLL_PERIOD);
340 return;
341 }
342
343 if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y))
344 goto out;
345
346 input_report_abs(&hdaps_idev, ABS_X, x - rest_x);
347 input_report_abs(&hdaps_idev, ABS_Y, y - rest_y);
348 input_sync(&hdaps_idev);
349
350 mod_timer(&hdaps_timer, jiffies + HDAPS_POLL_PERIOD);
351
352out:
353 up(&hdaps_sem);
354}
355
Robert Love860e1d62005-08-31 23:57:59 -0400356
357/* Sysfs Files */
358
359static ssize_t hdaps_position_show(struct device *dev,
360 struct device_attribute *attr, char *buf)
361{
362 int ret, x, y;
363
364 ret = hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
365 if (ret)
366 return ret;
367
368 return sprintf(buf, "(%d,%d)\n", x, y);
369}
370
371static ssize_t hdaps_variance_show(struct device *dev,
372 struct device_attribute *attr, char *buf)
373{
374 int ret, x, y;
375
376 ret = hdaps_read_pair(HDAPS_PORT_XVAR, HDAPS_PORT_YVAR, &x, &y);
377 if (ret)
378 return ret;
379
380 return sprintf(buf, "(%d,%d)\n", x, y);
381}
382
383static ssize_t hdaps_temp1_show(struct device *dev,
384 struct device_attribute *attr, char *buf)
385{
386 u8 temp;
387 int ret;
388
389 ret = hdaps_readb_one(HDAPS_PORT_TEMP1, &temp);
390 if (ret < 0)
391 return ret;
392
393 return sprintf(buf, "%u\n", temp);
394}
395
396static ssize_t hdaps_temp2_show(struct device *dev,
397 struct device_attribute *attr, char *buf)
398{
399 u8 temp;
400 int ret;
401
402 ret = hdaps_readb_one(HDAPS_PORT_TEMP2, &temp);
403 if (ret < 0)
404 return ret;
405
406 return sprintf(buf, "%u\n", temp);
407}
408
409static ssize_t hdaps_keyboard_activity_show(struct device *dev,
410 struct device_attribute *attr,
411 char *buf)
412{
413 return sprintf(buf, "%u\n", KEYBD_ISSET(km_activity));
414}
415
416static ssize_t hdaps_mouse_activity_show(struct device *dev,
417 struct device_attribute *attr,
418 char *buf)
419{
420 return sprintf(buf, "%u\n", MOUSE_ISSET(km_activity));
421}
422
423static ssize_t hdaps_calibrate_show(struct device *dev,
424 struct device_attribute *attr, char *buf)
425{
426 return sprintf(buf, "(%d,%d)\n", rest_x, rest_y);
427}
428
429static ssize_t hdaps_calibrate_store(struct device *dev,
430 struct device_attribute *attr,
431 const char *buf, size_t count)
432{
433 down(&hdaps_sem);
434 hdaps_calibrate();
435 up(&hdaps_sem);
436
437 return count;
438}
439
440static ssize_t hdaps_invert_show(struct device *dev,
441 struct device_attribute *attr, char *buf)
442{
443 return sprintf(buf, "%u\n", hdaps_invert);
444}
445
446static ssize_t hdaps_invert_store(struct device *dev,
447 struct device_attribute *attr,
448 const char *buf, size_t count)
449{
450 int invert;
451
452 if (sscanf(buf, "%d", &invert) != 1 || (invert != 1 && invert != 0))
453 return -EINVAL;
454
455 hdaps_invert = invert;
456 hdaps_calibrate();
457
458 return count;
459}
460
Robert Love860e1d62005-08-31 23:57:59 -0400461static DEVICE_ATTR(position, 0444, hdaps_position_show, NULL);
462static DEVICE_ATTR(variance, 0444, hdaps_variance_show, NULL);
463static DEVICE_ATTR(temp1, 0444, hdaps_temp1_show, NULL);
464static DEVICE_ATTR(temp2, 0444, hdaps_temp2_show, NULL);
465static DEVICE_ATTR(keyboard_activity, 0444, hdaps_keyboard_activity_show, NULL);
466static DEVICE_ATTR(mouse_activity, 0444, hdaps_mouse_activity_show, NULL);
467static DEVICE_ATTR(calibrate, 0644, hdaps_calibrate_show,hdaps_calibrate_store);
468static DEVICE_ATTR(invert, 0644, hdaps_invert_show, hdaps_invert_store);
Robert Love860e1d62005-08-31 23:57:59 -0400469
470static struct attribute *hdaps_attributes[] = {
471 &dev_attr_position.attr,
472 &dev_attr_variance.attr,
473 &dev_attr_temp1.attr,
474 &dev_attr_temp2.attr,
475 &dev_attr_keyboard_activity.attr,
476 &dev_attr_mouse_activity.attr,
477 &dev_attr_calibrate.attr,
Robert Love860e1d62005-08-31 23:57:59 -0400478 &dev_attr_invert.attr,
479 NULL,
480};
481
482static struct attribute_group hdaps_attribute_group = {
483 .attrs = hdaps_attributes,
484};
485
486
487/* Module stuff */
488
Robert Love4c87b742005-09-22 21:44:00 -0700489/* hdaps_dmi_match - found a match. return one, short-circuiting the hunt. */
Robert Love860e1d62005-08-31 23:57:59 -0400490static int hdaps_dmi_match(struct dmi_system_id *id)
491{
492 printk(KERN_INFO "hdaps: %s detected.\n", id->ident);
Robert Love4c87b742005-09-22 21:44:00 -0700493 return 1;
Robert Love860e1d62005-08-31 23:57:59 -0400494}
495
Robert Love4c87b742005-09-22 21:44:00 -0700496/* hdaps_dmi_match_invert - found an inverted match. */
Robert Love860e1d62005-08-31 23:57:59 -0400497static int hdaps_dmi_match_invert(struct dmi_system_id *id)
498{
499 hdaps_invert = 1;
500 printk(KERN_INFO "hdaps: inverting axis readings.\n");
Robert Love4c87b742005-09-22 21:44:00 -0700501 return hdaps_dmi_match(id);
Robert Love860e1d62005-08-31 23:57:59 -0400502}
503
504#define HDAPS_DMI_MATCH_NORMAL(model) { \
505 .ident = "IBM " model, \
506 .callback = hdaps_dmi_match, \
507 .matches = { \
508 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), \
509 DMI_MATCH(DMI_PRODUCT_VERSION, model) \
510 } \
511}
512
513#define HDAPS_DMI_MATCH_INVERT(model) { \
514 .ident = "IBM " model, \
515 .callback = hdaps_dmi_match_invert, \
516 .matches = { \
517 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), \
518 DMI_MATCH(DMI_PRODUCT_VERSION, model) \
519 } \
520}
521
522static int __init hdaps_init(void)
523{
524 int ret;
525
526 /* Note that DMI_MATCH(...,"ThinkPad T42") will match "ThinkPad T42p" */
527 struct dmi_system_id hdaps_whitelist[] = {
528 HDAPS_DMI_MATCH_INVERT("ThinkPad R50p"),
529 HDAPS_DMI_MATCH_NORMAL("ThinkPad R50"),
530 HDAPS_DMI_MATCH_NORMAL("ThinkPad R51"),
Robert Love4c87b742005-09-22 21:44:00 -0700531 HDAPS_DMI_MATCH_NORMAL("ThinkPad R52"),
Robert Love860e1d62005-08-31 23:57:59 -0400532 HDAPS_DMI_MATCH_INVERT("ThinkPad T41p"),
533 HDAPS_DMI_MATCH_NORMAL("ThinkPad T41"),
534 HDAPS_DMI_MATCH_INVERT("ThinkPad T42p"),
535 HDAPS_DMI_MATCH_NORMAL("ThinkPad T42"),
536 HDAPS_DMI_MATCH_NORMAL("ThinkPad T43"),
537 HDAPS_DMI_MATCH_NORMAL("ThinkPad X40"),
Robert Love393ad292005-09-16 19:28:07 -0700538 HDAPS_DMI_MATCH_NORMAL("ThinkPad X41 Tablet"),
Robert Love4c87b742005-09-22 21:44:00 -0700539 HDAPS_DMI_MATCH_NORMAL("ThinkPad X41"),
Robert Love860e1d62005-08-31 23:57:59 -0400540 { .ident = NULL }
541 };
542
543 if (!dmi_check_system(hdaps_whitelist)) {
544 printk(KERN_WARNING "hdaps: supported laptop not found!\n");
545 ret = -ENXIO;
546 goto out;
547 }
548
549 if (!request_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS, "hdaps")) {
550 ret = -ENXIO;
551 goto out;
552 }
553
Russell King3ae5eae2005-11-09 22:32:44 +0000554 ret = platform_driver_register(&hdaps_driver);
Robert Love860e1d62005-08-31 23:57:59 -0400555 if (ret)
556 goto out_region;
557
558 pdev = platform_device_register_simple("hdaps", -1, NULL, 0);
559 if (IS_ERR(pdev)) {
560 ret = PTR_ERR(pdev);
561 goto out_driver;
562 }
563
564 ret = sysfs_create_group(&pdev->dev.kobj, &hdaps_attribute_group);
565 if (ret)
566 goto out_device;
567
Robert Love393ad292005-09-16 19:28:07 -0700568 /* initial calibrate for the input device */
569 hdaps_calibrate();
570
571 /* initialize the input class */
572 hdaps_idev.dev = &pdev->dev;
573 input_register_device(&hdaps_idev);
574
575 /* start up our timer for the input device */
576 init_timer(&hdaps_timer);
577 hdaps_timer.function = hdaps_mousedev_poll;
578 hdaps_timer.expires = jiffies + HDAPS_POLL_PERIOD;
579 add_timer(&hdaps_timer);
Robert Love860e1d62005-08-31 23:57:59 -0400580
581 printk(KERN_INFO "hdaps: driver successfully loaded.\n");
582 return 0;
583
584out_device:
585 platform_device_unregister(pdev);
586out_driver:
Russell King3ae5eae2005-11-09 22:32:44 +0000587 platform_driver_unregister(&hdaps_driver);
Robert Love860e1d62005-08-31 23:57:59 -0400588out_region:
589 release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS);
590out:
591 printk(KERN_WARNING "hdaps: driver init failed (ret=%d)!\n", ret);
592 return ret;
593}
594
595static void __exit hdaps_exit(void)
596{
Robert Love393ad292005-09-16 19:28:07 -0700597 del_timer_sync(&hdaps_timer);
598 input_unregister_device(&hdaps_idev);
Robert Love860e1d62005-08-31 23:57:59 -0400599 sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group);
600 platform_device_unregister(pdev);
Russell King3ae5eae2005-11-09 22:32:44 +0000601 platform_driver_unregister(&hdaps_driver);
Robert Love860e1d62005-08-31 23:57:59 -0400602 release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS);
603
604 printk(KERN_INFO "hdaps: driver unloaded.\n");
605}
606
607module_init(hdaps_init);
608module_exit(hdaps_exit);
609
Robert Love860e1d62005-08-31 23:57:59 -0400610module_param_named(invert, hdaps_invert, bool, 0);
611MODULE_PARM_DESC(invert, "invert data along each axis");
612
613MODULE_AUTHOR("Robert Love");
614MODULE_DESCRIPTION("IBM Hard Drive Active Protection System (HDAPS) driver");
615MODULE_LICENSE("GPL v2");