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Peter Feuerere86435e2009-06-21 18:53:03 +02001/*
2 * acerhdf - A driver which monitors the temperature
3 * of the aspire one netbook, turns on/off the fan
4 * as soon as the upper/lower threshold is reached.
5 *
6 * (C) 2009 - Peter Feuerer peter (a) piie.net
7 * http://piie.net
8 * 2009 Borislav Petkov <petkovbb@gmail.com>
9 *
10 * Inspired by and many thanks to:
11 * o acerfand - Rachel Greenham
12 * o acer_ec.pl - Michael Kurz michi.kurz (at) googlemail.com
13 * - Petr Tomasek tomasek (#) etf,cuni,cz
14 * - Carlos Corbacho cathectic (at) gmail.com
15 * o lkml - Matthew Garrett
16 * - Borislav Petkov
17 * - Andreas Mohr
18 *
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 */
33
34#define pr_fmt(fmt) "acerhdf: " fmt
35
36#include <linux/kernel.h>
37#include <linux/module.h>
38#include <linux/fs.h>
39#include <linux/dmi.h>
40#include <acpi/acpi_drivers.h>
41#include <linux/sched.h>
42#include <linux/thermal.h>
43#include <linux/platform_device.h>
44
45/*
46 * The driver is started with "kernel mode off" by default. That means, the BIOS
47 * is still in control of the fan. In this mode the driver allows to read the
48 * temperature of the cpu and a userspace tool may take over control of the fan.
49 * If the driver is switched to "kernel mode" (e.g. via module parameter) the
50 * driver is in full control of the fan. If you want the module to be started in
51 * kernel mode by default, define the following:
52 */
53#undef START_IN_KERNEL_MODE
54
Peter Feuerer70052912009-11-17 14:07:21 -080055#define DRV_VER "0.5.18"
Peter Feuerere86435e2009-06-21 18:53:03 +020056
57/*
58 * According to the Atom N270 datasheet,
59 * (http://download.intel.com/design/processor/datashts/320032.pdf) the
60 * CPU's optimal operating limits denoted in junction temperature as
61 * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So,
62 * assume 89°C is critical temperature.
63 */
Peter Feuerer70052912009-11-17 14:07:21 -080064#define ACERHDF_TEMP_CRIT 89000
Peter Feuerere86435e2009-06-21 18:53:03 +020065#define ACERHDF_FAN_OFF 0
66#define ACERHDF_FAN_AUTO 1
67
68/*
69 * No matter what value the user puts into the fanon variable, turn on the fan
70 * at 80 degree Celsius to prevent hardware damage
71 */
Peter Feuerer70052912009-11-17 14:07:21 -080072#define ACERHDF_MAX_FANON 80000
Peter Feuerere86435e2009-06-21 18:53:03 +020073
74/*
75 * Maximum interval between two temperature checks is 15 seconds, as the die
76 * can get hot really fast under heavy load (plus we shouldn't forget about
77 * possible impact of _external_ aggressive sources such as heaters, sun etc.)
78 */
79#define ACERHDF_MAX_INTERVAL 15
80
81#ifdef START_IN_KERNEL_MODE
82static int kernelmode = 1;
83#else
84static int kernelmode;
85#endif
86
87static unsigned int interval = 10;
Peter Feuerer70052912009-11-17 14:07:21 -080088static unsigned int fanon = 63000;
89static unsigned int fanoff = 58000;
Peter Feuerere86435e2009-06-21 18:53:03 +020090static unsigned int verbose;
91static unsigned int fanstate = ACERHDF_FAN_AUTO;
92static char force_bios[16];
Peter Feuererded0cdf2009-08-06 15:57:52 -070093static char force_product[16];
Peter Feuerere86435e2009-06-21 18:53:03 +020094static unsigned int prev_interval;
95struct thermal_zone_device *thz_dev;
96struct thermal_cooling_device *cl_dev;
97struct platform_device *acerhdf_dev;
98
99module_param(kernelmode, uint, 0);
100MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
101module_param(interval, uint, 0600);
102MODULE_PARM_DESC(interval, "Polling interval of temperature check");
103module_param(fanon, uint, 0600);
104MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
105module_param(fanoff, uint, 0600);
106MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
107module_param(verbose, uint, 0600);
108MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
109module_param_string(force_bios, force_bios, 16, 0);
110MODULE_PARM_DESC(force_bios, "Force BIOS version and omit BIOS check");
Peter Feuererded0cdf2009-08-06 15:57:52 -0700111module_param_string(force_product, force_product, 16, 0);
112MODULE_PARM_DESC(force_product, "Force BIOS product and omit BIOS check");
113
114/*
115 * cmd_off: to switch the fan completely off / to check if the fan is off
116 * cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
117 * the fan speed depending on the temperature
118 */
119struct fancmd {
120 u8 cmd_off;
121 u8 cmd_auto;
122};
Peter Feuerere86435e2009-06-21 18:53:03 +0200123
124/* BIOS settings */
125struct bios_settings_t {
126 const char *vendor;
Peter Feuererded0cdf2009-08-06 15:57:52 -0700127 const char *product;
Peter Feuerere86435e2009-06-21 18:53:03 +0200128 const char *version;
129 unsigned char fanreg;
130 unsigned char tempreg;
Peter Feuererded0cdf2009-08-06 15:57:52 -0700131 struct fancmd cmd;
Peter Feuerere86435e2009-06-21 18:53:03 +0200132};
133
134/* Register addresses and values for different BIOS versions */
135static const struct bios_settings_t bios_tbl[] = {
Peter Feuererded0cdf2009-08-06 15:57:52 -0700136 /* AOA110 */
137 {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00} },
138 {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00} },
139 {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00} },
140 {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00} },
141 {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00} },
Peter Feuererf9449152009-09-18 12:41:07 -0700142 {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00} },
Peter Feuererded0cdf2009-08-06 15:57:52 -0700143 {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00} },
144 {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00} },
145 {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00} },
146 /* AOA150 */
147 {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x20, 0x00} },
Peter Feuererf9449152009-09-18 12:41:07 -0700148 {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00} },
Peter Feuererded0cdf2009-08-06 15:57:52 -0700149 {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00} },
150 {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00} },
Peter Feuererf9449152009-09-18 12:41:07 -0700151 {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00} },
Peter Feuererded0cdf2009-08-06 15:57:52 -0700152 {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00} },
153 {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00} },
154 {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00} },
155 /* special BIOS / other */
156 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00} },
157 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00} },
158 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00} },
159 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00} },
Peter Feuererf9449152009-09-18 12:41:07 -0700160 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} },
Peter Feuererded0cdf2009-08-06 15:57:52 -0700161 /* pewpew-terminator */
162 {"", "", "", 0, 0, {0, 0} }
Peter Feuerere86435e2009-06-21 18:53:03 +0200163};
164
165static const struct bios_settings_t *bios_cfg __read_mostly;
166
Peter Feuerere86435e2009-06-21 18:53:03 +0200167static int acerhdf_get_temp(int *temp)
168{
169 u8 read_temp;
170
171 if (ec_read(bios_cfg->tempreg, &read_temp))
172 return -EINVAL;
173
Peter Feuerer70052912009-11-17 14:07:21 -0800174 *temp = read_temp * 1000;
Peter Feuerere86435e2009-06-21 18:53:03 +0200175
176 return 0;
177}
178
179static int acerhdf_get_fanstate(int *state)
180{
181 u8 fan;
Peter Feuerere86435e2009-06-21 18:53:03 +0200182
183 if (ec_read(bios_cfg->fanreg, &fan))
184 return -EINVAL;
185
Peter Feuererded0cdf2009-08-06 15:57:52 -0700186 if (fan != bios_cfg->cmd.cmd_off)
187 *state = ACERHDF_FAN_AUTO;
188 else
189 *state = ACERHDF_FAN_OFF;
Peter Feuerere86435e2009-06-21 18:53:03 +0200190
191 return 0;
192}
193
194static void acerhdf_change_fanstate(int state)
195{
196 unsigned char cmd;
197
198 if (verbose)
199 pr_notice("fan %s\n", (state == ACERHDF_FAN_OFF) ?
200 "OFF" : "ON");
201
202 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
203 pr_err("invalid fan state %d requested, setting to auto!\n",
204 state);
205 state = ACERHDF_FAN_AUTO;
206 }
207
Peter Feuererded0cdf2009-08-06 15:57:52 -0700208 cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
209 : bios_cfg->cmd.cmd_auto;
Peter Feuerere86435e2009-06-21 18:53:03 +0200210 fanstate = state;
211
212 ec_write(bios_cfg->fanreg, cmd);
213}
214
215static void acerhdf_check_param(struct thermal_zone_device *thermal)
216{
217 if (fanon > ACERHDF_MAX_FANON) {
218 pr_err("fanon temperature too high, set to %d\n",
219 ACERHDF_MAX_FANON);
220 fanon = ACERHDF_MAX_FANON;
221 }
222
223 if (kernelmode && prev_interval != interval) {
224 if (interval > ACERHDF_MAX_INTERVAL) {
225 pr_err("interval too high, set to %d\n",
226 ACERHDF_MAX_INTERVAL);
227 interval = ACERHDF_MAX_INTERVAL;
228 }
229 if (verbose)
230 pr_notice("interval changed to: %d\n",
231 interval);
232 thermal->polling_delay = interval*1000;
233 prev_interval = interval;
234 }
235}
236
237/*
238 * This is the thermal zone callback which does the delayed polling of the fan
239 * state. We do check /sysfs-originating settings here in acerhdf_check_param()
240 * as late as the polling interval is since we can't do that in the respective
241 * accessors of the module parameters.
242 */
243static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
244 unsigned long *t)
245{
246 int temp, err = 0;
247
248 acerhdf_check_param(thermal);
249
250 err = acerhdf_get_temp(&temp);
251 if (err)
252 return err;
253
254 if (verbose)
255 pr_notice("temp %d\n", temp);
256
257 *t = temp;
258 return 0;
259}
260
261static int acerhdf_bind(struct thermal_zone_device *thermal,
262 struct thermal_cooling_device *cdev)
263{
264 /* if the cooling device is the one from acerhdf bind it */
265 if (cdev != cl_dev)
266 return 0;
267
268 if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
269 pr_err("error binding cooling dev\n");
270 return -EINVAL;
271 }
272 return 0;
273}
274
275static int acerhdf_unbind(struct thermal_zone_device *thermal,
276 struct thermal_cooling_device *cdev)
277{
278 if (cdev != cl_dev)
279 return 0;
280
281 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
282 pr_err("error unbinding cooling dev\n");
283 return -EINVAL;
284 }
285 return 0;
286}
287
288static inline void acerhdf_revert_to_bios_mode(void)
289{
290 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
291 kernelmode = 0;
292 if (thz_dev)
293 thz_dev->polling_delay = 0;
294 pr_notice("kernel mode fan control OFF\n");
295}
296static inline void acerhdf_enable_kernelmode(void)
297{
298 kernelmode = 1;
299
300 thz_dev->polling_delay = interval*1000;
301 thermal_zone_device_update(thz_dev);
302 pr_notice("kernel mode fan control ON\n");
303}
304
305static int acerhdf_get_mode(struct thermal_zone_device *thermal,
306 enum thermal_device_mode *mode)
307{
308 if (verbose)
309 pr_notice("kernel mode fan control %d\n", kernelmode);
310
311 *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
312 : THERMAL_DEVICE_DISABLED;
313
314 return 0;
315}
316
317/*
318 * set operation mode;
319 * enabled: the thermal layer of the kernel takes care about
320 * the temperature and the fan.
321 * disabled: the BIOS takes control of the fan.
322 */
323static int acerhdf_set_mode(struct thermal_zone_device *thermal,
324 enum thermal_device_mode mode)
325{
326 if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
327 acerhdf_revert_to_bios_mode();
328 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
329 acerhdf_enable_kernelmode();
330
331 return 0;
332}
333
334static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
335 enum thermal_trip_type *type)
336{
337 if (trip == 0)
338 *type = THERMAL_TRIP_ACTIVE;
339
340 return 0;
341}
342
343static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
344 unsigned long *temp)
345{
346 if (trip == 0)
347 *temp = fanon;
348
349 return 0;
350}
351
352static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
353 unsigned long *temperature)
354{
355 *temperature = ACERHDF_TEMP_CRIT;
356 return 0;
357}
358
359/* bind callback functions to thermalzone */
360struct thermal_zone_device_ops acerhdf_dev_ops = {
361 .bind = acerhdf_bind,
362 .unbind = acerhdf_unbind,
363 .get_temp = acerhdf_get_ec_temp,
364 .get_mode = acerhdf_get_mode,
365 .set_mode = acerhdf_set_mode,
366 .get_trip_type = acerhdf_get_trip_type,
367 .get_trip_temp = acerhdf_get_trip_temp,
368 .get_crit_temp = acerhdf_get_crit_temp,
369};
370
371
372/*
373 * cooling device callback functions
374 * get maximal fan cooling state
375 */
376static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
377 unsigned long *state)
378{
379 *state = 1;
380
381 return 0;
382}
383
384static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
385 unsigned long *state)
386{
387 int err = 0, tmp;
388
389 err = acerhdf_get_fanstate(&tmp);
390 if (err)
391 return err;
392
393 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
394 return 0;
395}
396
397/* change current fan state - is overwritten when running in kernel mode */
398static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
399 unsigned long state)
400{
401 int cur_temp, cur_state, err = 0;
402
403 if (!kernelmode)
404 return 0;
405
406 err = acerhdf_get_temp(&cur_temp);
407 if (err) {
408 pr_err("error reading temperature, hand off control to BIOS\n");
409 goto err_out;
410 }
411
412 err = acerhdf_get_fanstate(&cur_state);
413 if (err) {
414 pr_err("error reading fan state, hand off control to BIOS\n");
415 goto err_out;
416 }
417
418 if (state == 0) {
419 /* turn fan off only if below fanoff temperature */
420 if ((cur_state == ACERHDF_FAN_AUTO) &&
421 (cur_temp < fanoff))
422 acerhdf_change_fanstate(ACERHDF_FAN_OFF);
423 } else {
424 if (cur_state == ACERHDF_FAN_OFF)
425 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
426 }
427 return 0;
428
429err_out:
430 acerhdf_revert_to_bios_mode();
431 return -EINVAL;
432}
433
434/* bind fan callbacks to fan device */
435struct thermal_cooling_device_ops acerhdf_cooling_ops = {
436 .get_max_state = acerhdf_get_max_state,
437 .get_cur_state = acerhdf_get_cur_state,
438 .set_cur_state = acerhdf_set_cur_state,
439};
440
441/* suspend / resume functionality */
Borislav Petkovff27e1f2009-09-18 12:41:05 -0700442static int acerhdf_suspend(struct device *dev)
Peter Feuerere86435e2009-06-21 18:53:03 +0200443{
444 if (kernelmode)
445 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
446
447 if (verbose)
448 pr_notice("going suspend\n");
449
450 return 0;
451}
452
Peter Feuerere86435e2009-06-21 18:53:03 +0200453static int __devinit acerhdf_probe(struct platform_device *device)
454{
455 return 0;
456}
457
458static int acerhdf_remove(struct platform_device *device)
459{
460 return 0;
461}
462
Alexey Dobriyan47145212009-12-14 18:00:08 -0800463static const struct dev_pm_ops acerhdf_pm_ops = {
Borislav Petkovff27e1f2009-09-18 12:41:05 -0700464 .suspend = acerhdf_suspend,
465 .freeze = acerhdf_suspend,
466};
467
Peter Feuererded0cdf2009-08-06 15:57:52 -0700468static struct platform_driver acerhdf_driver = {
Peter Feuerere86435e2009-06-21 18:53:03 +0200469 .driver = {
Borislav Petkovff27e1f2009-09-18 12:41:05 -0700470 .name = "acerhdf",
Peter Feuerere86435e2009-06-21 18:53:03 +0200471 .owner = THIS_MODULE,
Borislav Petkovff27e1f2009-09-18 12:41:05 -0700472 .pm = &acerhdf_pm_ops,
Peter Feuerere86435e2009-06-21 18:53:03 +0200473 },
474 .probe = acerhdf_probe,
475 .remove = acerhdf_remove,
Peter Feuerere86435e2009-06-21 18:53:03 +0200476};
477
478
479/* check hardware */
480static int acerhdf_check_hardware(void)
481{
482 char const *vendor, *version, *product;
483 int i;
Peter Feuererded0cdf2009-08-06 15:57:52 -0700484 unsigned long prod_len = 0;
Peter Feuerere86435e2009-06-21 18:53:03 +0200485
486 /* get BIOS data */
487 vendor = dmi_get_system_info(DMI_SYS_VENDOR);
488 version = dmi_get_system_info(DMI_BIOS_VERSION);
489 product = dmi_get_system_info(DMI_PRODUCT_NAME);
490
Peter Feuererded0cdf2009-08-06 15:57:52 -0700491
Peter Feuerere86435e2009-06-21 18:53:03 +0200492 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
493
Peter Feuererded0cdf2009-08-06 15:57:52 -0700494 if (force_bios[0]) {
Peter Feuerere86435e2009-06-21 18:53:03 +0200495 version = force_bios;
Peter Feuererded0cdf2009-08-06 15:57:52 -0700496 pr_info("forcing BIOS version: %s\n", version);
Peter Feuerere86435e2009-06-21 18:53:03 +0200497 kernelmode = 0;
498 }
499
Peter Feuererded0cdf2009-08-06 15:57:52 -0700500 if (force_product[0]) {
501 product = force_product;
502 pr_info("forcing BIOS product: %s\n", product);
503 kernelmode = 0;
504 }
505
506 prod_len = strlen(product);
507
Peter Feuerere86435e2009-06-21 18:53:03 +0200508 if (verbose)
509 pr_info("BIOS info: %s %s, product: %s\n",
510 vendor, version, product);
511
512 /* search BIOS version and vendor in BIOS settings table */
513 for (i = 0; bios_tbl[i].version[0]; i++) {
Peter Feuererded0cdf2009-08-06 15:57:52 -0700514 if (strlen(bios_tbl[i].product) >= prod_len &&
515 !strncmp(bios_tbl[i].product, product,
516 strlen(bios_tbl[i].product)) &&
517 !strcmp(bios_tbl[i].vendor, vendor) &&
Peter Feuerere86435e2009-06-21 18:53:03 +0200518 !strcmp(bios_tbl[i].version, version)) {
519 bios_cfg = &bios_tbl[i];
520 break;
521 }
522 }
523
524 if (!bios_cfg) {
Peter Feuererded0cdf2009-08-06 15:57:52 -0700525 pr_err("unknown (unsupported) BIOS version %s/%s/%s, "
526 "please report, aborting!\n", vendor, product, version);
Peter Feuerere86435e2009-06-21 18:53:03 +0200527 return -EINVAL;
528 }
529
530 /*
531 * if started with kernel mode off, prevent the kernel from switching
532 * off the fan
533 */
534 if (!kernelmode) {
535 pr_notice("Fan control off, to enable do:\n");
536 pr_notice("echo -n \"enabled\" > "
537 "/sys/class/thermal/thermal_zone0/mode\n");
538 }
539
540 return 0;
541}
542
543static int acerhdf_register_platform(void)
544{
545 int err = 0;
546
Peter Feuererded0cdf2009-08-06 15:57:52 -0700547 err = platform_driver_register(&acerhdf_driver);
Peter Feuerere86435e2009-06-21 18:53:03 +0200548 if (err)
549 return err;
550
551 acerhdf_dev = platform_device_alloc("acerhdf", -1);
552 platform_device_add(acerhdf_dev);
553
554 return 0;
555}
556
557static void acerhdf_unregister_platform(void)
558{
559 if (!acerhdf_dev)
560 return;
561
562 platform_device_del(acerhdf_dev);
Peter Feuererded0cdf2009-08-06 15:57:52 -0700563 platform_driver_unregister(&acerhdf_driver);
Peter Feuerere86435e2009-06-21 18:53:03 +0200564}
565
566static int acerhdf_register_thermal(void)
567{
568 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
569 &acerhdf_cooling_ops);
570
571 if (IS_ERR(cl_dev))
572 return -EINVAL;
573
574 thz_dev = thermal_zone_device_register("acerhdf", 1, NULL,
575 &acerhdf_dev_ops, 0, 0, 0,
576 (kernelmode) ? interval*1000 : 0);
577 if (IS_ERR(thz_dev))
578 return -EINVAL;
579
580 return 0;
581}
582
583static void acerhdf_unregister_thermal(void)
584{
585 if (cl_dev) {
586 thermal_cooling_device_unregister(cl_dev);
587 cl_dev = NULL;
588 }
589
590 if (thz_dev) {
591 thermal_zone_device_unregister(thz_dev);
592 thz_dev = NULL;
593 }
594}
595
596static int __init acerhdf_init(void)
597{
598 int err = 0;
599
600 err = acerhdf_check_hardware();
601 if (err)
602 goto out_err;
603
604 err = acerhdf_register_platform();
605 if (err)
606 goto err_unreg;
607
608 err = acerhdf_register_thermal();
609 if (err)
610 goto err_unreg;
611
612 return 0;
613
614err_unreg:
615 acerhdf_unregister_thermal();
616 acerhdf_unregister_platform();
617
618out_err:
619 return -ENODEV;
620}
621
622static void __exit acerhdf_exit(void)
623{
624 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
625 acerhdf_unregister_thermal();
626 acerhdf_unregister_platform();
627}
628
629MODULE_LICENSE("GPL");
630MODULE_AUTHOR("Peter Feuerer");
631MODULE_DESCRIPTION("Aspire One temperature and fan driver");
632MODULE_ALIAS("dmi:*:*Acer*:*:");
633MODULE_ALIAS("dmi:*:*Gateway*:*:");
634MODULE_ALIAS("dmi:*:*Packard Bell*:*:");
635
636module_init(acerhdf_init);
637module_exit(acerhdf_exit);