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860e1d6b RL |
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"); |