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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 | |
393ad299 RL |
8 | * T41, T42, T43, R50, R50p, R51, and X40, at least. It provides a basic |
9 | * two-axis accelerometer and other data, such as the device's temperature. | |
860e1d6b | 10 | * |
393ad299 | 11 | * This driver is based on the document by Mark A. Smith available at |
860e1d6b RL |
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 */ | |
393ad299 | 39 | #define HDAPS_NR_PORTS 0x30 /* number of ports: 0x1600 - 0x162f */ |
860e1d6b RL |
40 | |
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 | ||
393ad299 | 51 | #define STATE_FRESH 0x50 /* accelerometer data is fresh */ |
860e1d6b RL |
52 | |
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 | ||
393ad299 RL |
61 | #define HDAPS_POLL_PERIOD (HZ/20) /* poll for input every 1/20s */ |
62 | #define HDAPS_INPUT_FUZZ 4 /* input event threshold */ | |
63 | ||
860e1d6b | 64 | static struct timer_list hdaps_timer; |
393ad299 | 65 | static struct platform_device *pdev; |
860e1d6b RL |
66 | static unsigned int hdaps_invert; |
67 | static u8 km_activity; | |
68 | static int rest_x; | |
69 | static int rest_y; | |
70 | ||
71 | static DECLARE_MUTEX(hdaps_sem); | |
72 | ||
73 | /* | |
74 | * __get_latch - Get the value from a given port. Callers must hold hdaps_sem. | |
75 | */ | |
76 | static inline u8 __get_latch(u16 port) | |
77 | { | |
393ad299 | 78 | return inb(port) & 0xff; |
860e1d6b RL |
79 | } |
80 | ||
81 | /* | |
393ad299 RL |
82 | * __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. | |
860e1d6b | 84 | */ |
393ad299 | 85 | static inline int __check_latch(u16 port, u8 val) |
860e1d6b RL |
86 | { |
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 | */ | |
393ad299 | 96 | static int __wait_latch(u16 port, u8 val) |
860e1d6b RL |
97 | { |
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 | ||
393ad299 | 106 | return -EIO; |
860e1d6b RL |
107 | } |
108 | ||
109 | /* | |
393ad299 RL |
110 | * __device_refresh - request a refresh from the accelerometer. Does not wait |
111 | * for refresh to complete. Callers must hold hdaps_sem. | |
860e1d6b | 112 | */ |
393ad299 | 113 | static void __device_refresh(void) |
860e1d6b | 114 | { |
393ad299 RL |
115 | udelay(200); |
116 | if (inb(0x1604) != STATE_FRESH) { | |
117 | outb(0x11, 0x1610); | |
118 | outb(0x01, 0x161f); | |
119 | } | |
120 | } | |
860e1d6b | 121 | |
393ad299 RL |
122 | /* |
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 | */ | |
127 | static int __device_refresh_sync(void) | |
128 | { | |
129 | __device_refresh(); | |
860e1d6b RL |
130 | return __wait_latch(0x1604, STATE_FRESH); |
131 | } | |
132 | ||
133 | /* | |
393ad299 | 134 | * __device_complete - indicate to the accelerometer that we are done reading |
860e1d6b RL |
135 | * data, and then initiate an async refresh. Callers must hold hdaps_sem. |
136 | */ | |
137 | static inline void __device_complete(void) | |
138 | { | |
139 | inb(0x161f); | |
140 | inb(0x1604); | |
393ad299 | 141 | __device_refresh(); |
860e1d6b RL |
142 | } |
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 | */ | |
149 | static int hdaps_readb_one(unsigned int port, u8 *val) | |
150 | { | |
151 | int ret; | |
152 | ||
153 | down(&hdaps_sem); | |
860e1d6b | 154 | |
393ad299 RL |
155 | /* 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 | ||
163 | out: | |
164 | up(&hdaps_sem); | |
860e1d6b RL |
165 | return ret; |
166 | } | |
167 | ||
393ad299 | 168 | /* __hdaps_read_pair - internal lockless helper for hdaps_read_pair(). */ |
860e1d6b RL |
169 | static 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 */ | |
393ad299 | 173 | if (__device_refresh_sync()) |
860e1d6b RL |
174 | 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 | */ | |
194 | static 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 | ||
393ad299 RL |
206 | /* |
207 | * hdaps_device_init - initialize the accelerometer. Returns zero on success | |
208 | * and negative error code on failure. Can sleep. | |
209 | */ | |
860e1d6b RL |
210 | static int hdaps_device_init(void) |
211 | { | |
393ad299 | 212 | int total, ret = -ENXIO; |
860e1d6b RL |
213 | |
214 | down(&hdaps_sem); | |
215 | ||
216 | outb(0x13, 0x1610); | |
217 | outb(0x01, 0x161f); | |
218 | if (__wait_latch(0x161f, 0x00)) | |
219 | goto out; | |
220 | ||
221 | /* | |
393ad299 RL |
222 | * Most ThinkPads return 0x01. |
223 | * | |
224 | * Others--namely the R50p, T41p, and T42p--return 0x03. These laptops | |
225 | * have "inverted" axises. | |
860e1d6b RL |
226 | * |
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; | |
393ad299 | 260 | if (__device_refresh_sync()) |
860e1d6b RL |
261 | 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 */ | |
393ad299 RL |
266 | for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) { |
267 | int x, y; | |
860e1d6b RL |
268 | |
269 | /* a read of the device helps push it into action */ | |
393ad299 | 270 | __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y); |
860e1d6b RL |
271 | if (!__wait_latch(0x1611, 0x02)) { |
272 | ret = 0; | |
273 | break; | |
274 | } | |
275 | ||
276 | msleep(INIT_WAIT_MSECS); | |
860e1d6b RL |
277 | } |
278 | ||
279 | out: | |
280 | up(&hdaps_sem); | |
281 | return ret; | |
282 | } | |
283 | ||
284 | ||
860e1d6b RL |
285 | /* Device model stuff */ |
286 | ||
287 | static 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 | ||
299 | static int hdaps_resume(struct device *dev, u32 level) | |
300 | { | |
301 | if (level == RESUME_ENABLE) | |
302 | return hdaps_device_init(); | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static struct device_driver hdaps_driver = { | |
307 | .name = "hdaps", | |
308 | .bus = &platform_bus_type, | |
309 | .owner = THIS_MODULE, | |
310 | .probe = hdaps_probe, | |
311 | .resume = hdaps_resume | |
312 | }; | |
313 | ||
393ad299 RL |
314 | /* Input class stuff */ |
315 | ||
316 | static struct input_dev hdaps_idev = { | |
317 | .name = "hdaps", | |
318 | .evbit = { BIT(EV_ABS) }, | |
319 | .absbit = { BIT(ABS_X) | BIT(ABS_Y) }, | |
320 | .absmin = { [ABS_X] = -256, [ABS_Y] = -256 }, | |
321 | .absmax = { [ABS_X] = 256, [ABS_Y] = 256 }, | |
322 | .absfuzz = { [ABS_X] = HDAPS_INPUT_FUZZ, [ABS_Y] = HDAPS_INPUT_FUZZ }, | |
323 | .absflat = { [ABS_X] = HDAPS_INPUT_FUZZ, [ABS_Y] = HDAPS_INPUT_FUZZ }, | |
324 | }; | |
325 | ||
326 | /* | |
327 | * hdaps_calibrate - Set our "resting" values. Callers must hold hdaps_sem. | |
328 | */ | |
329 | static void hdaps_calibrate(void) | |
330 | { | |
331 | __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &rest_x, &rest_y); | |
332 | } | |
333 | ||
334 | static void hdaps_mousedev_poll(unsigned long unused) | |
335 | { | |
336 | int x, y; | |
337 | ||
338 | /* Cannot sleep. Try nonblockingly. If we fail, try again later. */ | |
339 | if (down_trylock(&hdaps_sem)) { | |
340 | mod_timer(&hdaps_timer,jiffies + HDAPS_POLL_PERIOD); | |
341 | return; | |
342 | } | |
343 | ||
344 | if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y)) | |
345 | goto out; | |
346 | ||
347 | input_report_abs(&hdaps_idev, ABS_X, x - rest_x); | |
348 | input_report_abs(&hdaps_idev, ABS_Y, y - rest_y); | |
349 | input_sync(&hdaps_idev); | |
350 | ||
351 | mod_timer(&hdaps_timer, jiffies + HDAPS_POLL_PERIOD); | |
352 | ||
353 | out: | |
354 | up(&hdaps_sem); | |
355 | } | |
356 | ||
860e1d6b RL |
357 | |
358 | /* Sysfs Files */ | |
359 | ||
360 | static ssize_t hdaps_position_show(struct device *dev, | |
361 | struct device_attribute *attr, char *buf) | |
362 | { | |
363 | int ret, x, y; | |
364 | ||
365 | ret = hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y); | |
366 | if (ret) | |
367 | return ret; | |
368 | ||
369 | return sprintf(buf, "(%d,%d)\n", x, y); | |
370 | } | |
371 | ||
372 | static ssize_t hdaps_variance_show(struct device *dev, | |
373 | struct device_attribute *attr, char *buf) | |
374 | { | |
375 | int ret, x, y; | |
376 | ||
377 | ret = hdaps_read_pair(HDAPS_PORT_XVAR, HDAPS_PORT_YVAR, &x, &y); | |
378 | if (ret) | |
379 | return ret; | |
380 | ||
381 | return sprintf(buf, "(%d,%d)\n", x, y); | |
382 | } | |
383 | ||
384 | static ssize_t hdaps_temp1_show(struct device *dev, | |
385 | struct device_attribute *attr, char *buf) | |
386 | { | |
387 | u8 temp; | |
388 | int ret; | |
389 | ||
390 | ret = hdaps_readb_one(HDAPS_PORT_TEMP1, &temp); | |
391 | if (ret < 0) | |
392 | return ret; | |
393 | ||
394 | return sprintf(buf, "%u\n", temp); | |
395 | } | |
396 | ||
397 | static ssize_t hdaps_temp2_show(struct device *dev, | |
398 | struct device_attribute *attr, char *buf) | |
399 | { | |
400 | u8 temp; | |
401 | int ret; | |
402 | ||
403 | ret = hdaps_readb_one(HDAPS_PORT_TEMP2, &temp); | |
404 | if (ret < 0) | |
405 | return ret; | |
406 | ||
407 | return sprintf(buf, "%u\n", temp); | |
408 | } | |
409 | ||
410 | static ssize_t hdaps_keyboard_activity_show(struct device *dev, | |
411 | struct device_attribute *attr, | |
412 | char *buf) | |
413 | { | |
414 | return sprintf(buf, "%u\n", KEYBD_ISSET(km_activity)); | |
415 | } | |
416 | ||
417 | static ssize_t hdaps_mouse_activity_show(struct device *dev, | |
418 | struct device_attribute *attr, | |
419 | char *buf) | |
420 | { | |
421 | return sprintf(buf, "%u\n", MOUSE_ISSET(km_activity)); | |
422 | } | |
423 | ||
424 | static ssize_t hdaps_calibrate_show(struct device *dev, | |
425 | struct device_attribute *attr, char *buf) | |
426 | { | |
427 | return sprintf(buf, "(%d,%d)\n", rest_x, rest_y); | |
428 | } | |
429 | ||
430 | static ssize_t hdaps_calibrate_store(struct device *dev, | |
431 | struct device_attribute *attr, | |
432 | const char *buf, size_t count) | |
433 | { | |
434 | down(&hdaps_sem); | |
435 | hdaps_calibrate(); | |
436 | up(&hdaps_sem); | |
437 | ||
438 | return count; | |
439 | } | |
440 | ||
441 | static ssize_t hdaps_invert_show(struct device *dev, | |
442 | struct device_attribute *attr, char *buf) | |
443 | { | |
444 | return sprintf(buf, "%u\n", hdaps_invert); | |
445 | } | |
446 | ||
447 | static ssize_t hdaps_invert_store(struct device *dev, | |
448 | struct device_attribute *attr, | |
449 | const char *buf, size_t count) | |
450 | { | |
451 | int invert; | |
452 | ||
453 | if (sscanf(buf, "%d", &invert) != 1 || (invert != 1 && invert != 0)) | |
454 | return -EINVAL; | |
455 | ||
456 | hdaps_invert = invert; | |
457 | hdaps_calibrate(); | |
458 | ||
459 | return count; | |
460 | } | |
461 | ||
860e1d6b RL |
462 | static DEVICE_ATTR(position, 0444, hdaps_position_show, NULL); |
463 | static DEVICE_ATTR(variance, 0444, hdaps_variance_show, NULL); | |
464 | static DEVICE_ATTR(temp1, 0444, hdaps_temp1_show, NULL); | |
465 | static DEVICE_ATTR(temp2, 0444, hdaps_temp2_show, NULL); | |
466 | static DEVICE_ATTR(keyboard_activity, 0444, hdaps_keyboard_activity_show, NULL); | |
467 | static DEVICE_ATTR(mouse_activity, 0444, hdaps_mouse_activity_show, NULL); | |
468 | static DEVICE_ATTR(calibrate, 0644, hdaps_calibrate_show,hdaps_calibrate_store); | |
469 | static DEVICE_ATTR(invert, 0644, hdaps_invert_show, hdaps_invert_store); | |
860e1d6b RL |
470 | |
471 | static struct attribute *hdaps_attributes[] = { | |
472 | &dev_attr_position.attr, | |
473 | &dev_attr_variance.attr, | |
474 | &dev_attr_temp1.attr, | |
475 | &dev_attr_temp2.attr, | |
476 | &dev_attr_keyboard_activity.attr, | |
477 | &dev_attr_mouse_activity.attr, | |
478 | &dev_attr_calibrate.attr, | |
860e1d6b RL |
479 | &dev_attr_invert.attr, |
480 | NULL, | |
481 | }; | |
482 | ||
483 | static struct attribute_group hdaps_attribute_group = { | |
484 | .attrs = hdaps_attributes, | |
485 | }; | |
486 | ||
487 | ||
488 | /* Module stuff */ | |
489 | ||
490 | /* | |
491 | * XXX: We should be able to return nonzero and halt the detection process. | |
492 | * But there is a bug in dmi_check_system() where a nonzero return from the | |
493 | * first match will result in a return of failure from dmi_check_system(). | |
393ad299 | 494 | * I fixed this; the patch is 2.6-git. Once in a released tree, we can make |
860e1d6b RL |
495 | * hdaps_dmi_match_invert() return hdaps_dmi_match(), which in turn returns 1. |
496 | */ | |
497 | static int hdaps_dmi_match(struct dmi_system_id *id) | |
498 | { | |
499 | printk(KERN_INFO "hdaps: %s detected.\n", id->ident); | |
500 | return 0; | |
501 | } | |
502 | ||
503 | static int hdaps_dmi_match_invert(struct dmi_system_id *id) | |
504 | { | |
505 | hdaps_invert = 1; | |
506 | printk(KERN_INFO "hdaps: inverting axis readings.\n"); | |
507 | return 0; | |
508 | } | |
509 | ||
510 | #define HDAPS_DMI_MATCH_NORMAL(model) { \ | |
511 | .ident = "IBM " model, \ | |
512 | .callback = hdaps_dmi_match, \ | |
513 | .matches = { \ | |
514 | DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), \ | |
515 | DMI_MATCH(DMI_PRODUCT_VERSION, model) \ | |
516 | } \ | |
517 | } | |
518 | ||
519 | #define HDAPS_DMI_MATCH_INVERT(model) { \ | |
520 | .ident = "IBM " model, \ | |
521 | .callback = hdaps_dmi_match_invert, \ | |
522 | .matches = { \ | |
523 | DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), \ | |
524 | DMI_MATCH(DMI_PRODUCT_VERSION, model) \ | |
525 | } \ | |
526 | } | |
527 | ||
528 | static int __init hdaps_init(void) | |
529 | { | |
530 | int ret; | |
531 | ||
532 | /* Note that DMI_MATCH(...,"ThinkPad T42") will match "ThinkPad T42p" */ | |
533 | struct dmi_system_id hdaps_whitelist[] = { | |
534 | HDAPS_DMI_MATCH_INVERT("ThinkPad R50p"), | |
535 | HDAPS_DMI_MATCH_NORMAL("ThinkPad R50"), | |
536 | HDAPS_DMI_MATCH_NORMAL("ThinkPad R51"), | |
537 | HDAPS_DMI_MATCH_INVERT("ThinkPad T41p"), | |
538 | HDAPS_DMI_MATCH_NORMAL("ThinkPad T41"), | |
539 | HDAPS_DMI_MATCH_INVERT("ThinkPad T42p"), | |
540 | HDAPS_DMI_MATCH_NORMAL("ThinkPad T42"), | |
541 | HDAPS_DMI_MATCH_NORMAL("ThinkPad T43"), | |
542 | HDAPS_DMI_MATCH_NORMAL("ThinkPad X40"), | |
393ad299 | 543 | HDAPS_DMI_MATCH_NORMAL("ThinkPad X41 Tablet"), |
860e1d6b RL |
544 | { .ident = NULL } |
545 | }; | |
546 | ||
547 | if (!dmi_check_system(hdaps_whitelist)) { | |
548 | printk(KERN_WARNING "hdaps: supported laptop not found!\n"); | |
549 | ret = -ENXIO; | |
550 | goto out; | |
551 | } | |
552 | ||
553 | if (!request_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS, "hdaps")) { | |
554 | ret = -ENXIO; | |
555 | goto out; | |
556 | } | |
557 | ||
558 | ret = driver_register(&hdaps_driver); | |
559 | if (ret) | |
560 | goto out_region; | |
561 | ||
562 | pdev = platform_device_register_simple("hdaps", -1, NULL, 0); | |
563 | if (IS_ERR(pdev)) { | |
564 | ret = PTR_ERR(pdev); | |
565 | goto out_driver; | |
566 | } | |
567 | ||
568 | ret = sysfs_create_group(&pdev->dev.kobj, &hdaps_attribute_group); | |
569 | if (ret) | |
570 | goto out_device; | |
571 | ||
393ad299 RL |
572 | /* initial calibrate for the input device */ |
573 | hdaps_calibrate(); | |
574 | ||
575 | /* initialize the input class */ | |
576 | hdaps_idev.dev = &pdev->dev; | |
577 | input_register_device(&hdaps_idev); | |
578 | ||
579 | /* start up our timer for the input device */ | |
580 | init_timer(&hdaps_timer); | |
581 | hdaps_timer.function = hdaps_mousedev_poll; | |
582 | hdaps_timer.expires = jiffies + HDAPS_POLL_PERIOD; | |
583 | add_timer(&hdaps_timer); | |
860e1d6b RL |
584 | |
585 | printk(KERN_INFO "hdaps: driver successfully loaded.\n"); | |
586 | return 0; | |
587 | ||
588 | out_device: | |
589 | platform_device_unregister(pdev); | |
590 | out_driver: | |
591 | driver_unregister(&hdaps_driver); | |
592 | out_region: | |
593 | release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS); | |
594 | out: | |
595 | printk(KERN_WARNING "hdaps: driver init failed (ret=%d)!\n", ret); | |
596 | return ret; | |
597 | } | |
598 | ||
599 | static void __exit hdaps_exit(void) | |
600 | { | |
393ad299 RL |
601 | del_timer_sync(&hdaps_timer); |
602 | input_unregister_device(&hdaps_idev); | |
860e1d6b RL |
603 | sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group); |
604 | platform_device_unregister(pdev); | |
605 | driver_unregister(&hdaps_driver); | |
606 | release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS); | |
607 | ||
608 | printk(KERN_INFO "hdaps: driver unloaded.\n"); | |
609 | } | |
610 | ||
611 | module_init(hdaps_init); | |
612 | module_exit(hdaps_exit); | |
613 | ||
860e1d6b RL |
614 | module_param_named(invert, hdaps_invert, bool, 0); |
615 | MODULE_PARM_DESC(invert, "invert data along each axis"); | |
616 | ||
617 | MODULE_AUTHOR("Robert Love"); | |
618 | MODULE_DESCRIPTION("IBM Hard Drive Active Protection System (HDAPS) driver"); | |
619 | MODULE_LICENSE("GPL v2"); |