/drivers/platform/x86/acerhdf.c
C | 717 lines | 504 code | 108 blank | 105 comment | 73 complexity | 1826486364ae0d839fba80368c8b216b MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
1/*
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/dmi.h>
39#include <linux/acpi.h>
40#include <linux/thermal.h>
41#include <linux/platform_device.h>
42
43/*
44 * The driver is started with "kernel mode off" by default. That means, the BIOS
45 * is still in control of the fan. In this mode the driver allows to read the
46 * temperature of the cpu and a userspace tool may take over control of the fan.
47 * If the driver is switched to "kernel mode" (e.g. via module parameter) the
48 * driver is in full control of the fan. If you want the module to be started in
49 * kernel mode by default, define the following:
50 */
51#undef START_IN_KERNEL_MODE
52
53#define DRV_VER "0.5.24"
54
55/*
56 * According to the Atom N270 datasheet,
57 * (http://download.intel.com/design/processor/datashts/320032.pdf) the
58 * CPU's optimal operating limits denoted in junction temperature as
59 * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So,
60 * assume 89°C is critical temperature.
61 */
62#define ACERHDF_TEMP_CRIT 89000
63#define ACERHDF_FAN_OFF 0
64#define ACERHDF_FAN_AUTO 1
65
66/*
67 * No matter what value the user puts into the fanon variable, turn on the fan
68 * at 80 degree Celsius to prevent hardware damage
69 */
70#define ACERHDF_MAX_FANON 80000
71
72/*
73 * Maximum interval between two temperature checks is 15 seconds, as the die
74 * can get hot really fast under heavy load (plus we shouldn't forget about
75 * possible impact of _external_ aggressive sources such as heaters, sun etc.)
76 */
77#define ACERHDF_MAX_INTERVAL 15
78
79#ifdef START_IN_KERNEL_MODE
80static int kernelmode = 1;
81#else
82static int kernelmode;
83#endif
84
85static unsigned int interval = 10;
86static unsigned int fanon = 63000;
87static unsigned int fanoff = 58000;
88static unsigned int verbose;
89static unsigned int fanstate = ACERHDF_FAN_AUTO;
90static char force_bios[16];
91static char force_product[16];
92static unsigned int prev_interval;
93static struct thermal_zone_device *thz_dev;
94static struct thermal_cooling_device *cl_dev;
95static struct platform_device *acerhdf_dev;
96
97module_param(kernelmode, uint, 0);
98MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
99module_param(interval, uint, 0600);
100MODULE_PARM_DESC(interval, "Polling interval of temperature check");
101module_param(fanon, uint, 0600);
102MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
103module_param(fanoff, uint, 0600);
104MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
105module_param(verbose, uint, 0600);
106MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
107module_param_string(force_bios, force_bios, 16, 0);
108MODULE_PARM_DESC(force_bios, "Force BIOS version and omit BIOS check");
109module_param_string(force_product, force_product, 16, 0);
110MODULE_PARM_DESC(force_product, "Force BIOS product and omit BIOS check");
111
112/*
113 * cmd_off: to switch the fan completely off and check if the fan is off
114 * cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
115 * the fan speed depending on the temperature
116 */
117struct fancmd {
118 u8 cmd_off;
119 u8 cmd_auto;
120};
121
122/* BIOS settings */
123struct bios_settings_t {
124 const char *vendor;
125 const char *product;
126 const char *version;
127 unsigned char fanreg;
128 unsigned char tempreg;
129 struct fancmd cmd;
130};
131
132/* Register addresses and values for different BIOS versions */
133static const struct bios_settings_t bios_tbl[] = {
134 /* AOA110 */
135 {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00} },
136 {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00} },
137 {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00} },
138 {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00} },
139 {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00} },
140 {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00} },
141 {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00} },
142 {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00} },
143 {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00} },
144 /* AOA150 */
145 {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00} },
146 {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00} },
147 {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00} },
148 {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00} },
149 {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00} },
150 {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00} },
151 {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00} },
152 {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00} },
153 /* Acer 1410 */
154 {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
155 {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
156 {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
157 {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
158 {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
159 {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
160 {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
161 {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
162 {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
163 {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
164 /* Acer 1810xx */
165 {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
166 {"Acer", "Aspire 1810T", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
167 {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
168 {"Acer", "Aspire 1810T", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
169 {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
170 {"Acer", "Aspire 1810T", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
171 {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
172 {"Acer", "Aspire 1810T", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
173 {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
174 {"Acer", "Aspire 1810T", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
175 {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
176 {"Acer", "Aspire 1810T", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
177 {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
178 {"Acer", "Aspire 1810T", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
179 {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
180 {"Acer", "Aspire 1810T", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
181 {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
182 {"Acer", "Aspire 1810T", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
183 {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
184 {"Acer", "Aspire 1810T", "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
185 /* Acer 531 */
186 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00} },
187 /* Gateway */
188 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00} },
189 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00} },
190 {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x9e, 0x00} },
191 {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x9e, 0x00} },
192 {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x9e, 0x00} },
193 /* Packard Bell */
194 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00} },
195 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} },
196 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00} },
197 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} },
198 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
199 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
200 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
201 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
202 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
203 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
204 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
205 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
206 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00} },
207 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00} },
208 /* pewpew-terminator */
209 {"", "", "", 0, 0, {0, 0} }
210};
211
212static const struct bios_settings_t *bios_cfg __read_mostly;
213
214static int acerhdf_get_temp(int *temp)
215{
216 u8 read_temp;
217
218 if (ec_read(bios_cfg->tempreg, &read_temp))
219 return -EINVAL;
220
221 *temp = read_temp * 1000;
222
223 return 0;
224}
225
226static int acerhdf_get_fanstate(int *state)
227{
228 u8 fan;
229
230 if (ec_read(bios_cfg->fanreg, &fan))
231 return -EINVAL;
232
233 if (fan != bios_cfg->cmd.cmd_off)
234 *state = ACERHDF_FAN_AUTO;
235 else
236 *state = ACERHDF_FAN_OFF;
237
238 return 0;
239}
240
241static void acerhdf_change_fanstate(int state)
242{
243 unsigned char cmd;
244
245 if (verbose)
246 pr_notice("fan %s\n", (state == ACERHDF_FAN_OFF) ?
247 "OFF" : "ON");
248
249 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
250 pr_err("invalid fan state %d requested, setting to auto!\n",
251 state);
252 state = ACERHDF_FAN_AUTO;
253 }
254
255 cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
256 : bios_cfg->cmd.cmd_auto;
257 fanstate = state;
258
259 ec_write(bios_cfg->fanreg, cmd);
260}
261
262static void acerhdf_check_param(struct thermal_zone_device *thermal)
263{
264 if (fanon > ACERHDF_MAX_FANON) {
265 pr_err("fanon temperature too high, set to %d\n",
266 ACERHDF_MAX_FANON);
267 fanon = ACERHDF_MAX_FANON;
268 }
269
270 if (kernelmode && prev_interval != interval) {
271 if (interval > ACERHDF_MAX_INTERVAL) {
272 pr_err("interval too high, set to %d\n",
273 ACERHDF_MAX_INTERVAL);
274 interval = ACERHDF_MAX_INTERVAL;
275 }
276 if (verbose)
277 pr_notice("interval changed to: %d\n",
278 interval);
279 thermal->polling_delay = interval*1000;
280 prev_interval = interval;
281 }
282}
283
284/*
285 * This is the thermal zone callback which does the delayed polling of the fan
286 * state. We do check /sysfs-originating settings here in acerhdf_check_param()
287 * as late as the polling interval is since we can't do that in the respective
288 * accessors of the module parameters.
289 */
290static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
291 unsigned long *t)
292{
293 int temp, err = 0;
294
295 acerhdf_check_param(thermal);
296
297 err = acerhdf_get_temp(&temp);
298 if (err)
299 return err;
300
301 if (verbose)
302 pr_notice("temp %d\n", temp);
303
304 *t = temp;
305 return 0;
306}
307
308static int acerhdf_bind(struct thermal_zone_device *thermal,
309 struct thermal_cooling_device *cdev)
310{
311 /* if the cooling device is the one from acerhdf bind it */
312 if (cdev != cl_dev)
313 return 0;
314
315 if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
316 pr_err("error binding cooling dev\n");
317 return -EINVAL;
318 }
319 return 0;
320}
321
322static int acerhdf_unbind(struct thermal_zone_device *thermal,
323 struct thermal_cooling_device *cdev)
324{
325 if (cdev != cl_dev)
326 return 0;
327
328 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
329 pr_err("error unbinding cooling dev\n");
330 return -EINVAL;
331 }
332 return 0;
333}
334
335static inline void acerhdf_revert_to_bios_mode(void)
336{
337 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
338 kernelmode = 0;
339 if (thz_dev)
340 thz_dev->polling_delay = 0;
341 pr_notice("kernel mode fan control OFF\n");
342}
343static inline void acerhdf_enable_kernelmode(void)
344{
345 kernelmode = 1;
346
347 thz_dev->polling_delay = interval*1000;
348 thermal_zone_device_update(thz_dev);
349 pr_notice("kernel mode fan control ON\n");
350}
351
352static int acerhdf_get_mode(struct thermal_zone_device *thermal,
353 enum thermal_device_mode *mode)
354{
355 if (verbose)
356 pr_notice("kernel mode fan control %d\n", kernelmode);
357
358 *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
359 : THERMAL_DEVICE_DISABLED;
360
361 return 0;
362}
363
364/*
365 * set operation mode;
366 * enabled: the thermal layer of the kernel takes care about
367 * the temperature and the fan.
368 * disabled: the BIOS takes control of the fan.
369 */
370static int acerhdf_set_mode(struct thermal_zone_device *thermal,
371 enum thermal_device_mode mode)
372{
373 if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
374 acerhdf_revert_to_bios_mode();
375 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
376 acerhdf_enable_kernelmode();
377
378 return 0;
379}
380
381static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
382 enum thermal_trip_type *type)
383{
384 if (trip == 0)
385 *type = THERMAL_TRIP_ACTIVE;
386
387 return 0;
388}
389
390static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
391 unsigned long *temp)
392{
393 if (trip == 0)
394 *temp = fanon;
395
396 return 0;
397}
398
399static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
400 unsigned long *temperature)
401{
402 *temperature = ACERHDF_TEMP_CRIT;
403 return 0;
404}
405
406/* bind callback functions to thermalzone */
407static struct thermal_zone_device_ops acerhdf_dev_ops = {
408 .bind = acerhdf_bind,
409 .unbind = acerhdf_unbind,
410 .get_temp = acerhdf_get_ec_temp,
411 .get_mode = acerhdf_get_mode,
412 .set_mode = acerhdf_set_mode,
413 .get_trip_type = acerhdf_get_trip_type,
414 .get_trip_temp = acerhdf_get_trip_temp,
415 .get_crit_temp = acerhdf_get_crit_temp,
416};
417
418
419/*
420 * cooling device callback functions
421 * get maximal fan cooling state
422 */
423static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
424 unsigned long *state)
425{
426 *state = 1;
427
428 return 0;
429}
430
431static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
432 unsigned long *state)
433{
434 int err = 0, tmp;
435
436 err = acerhdf_get_fanstate(&tmp);
437 if (err)
438 return err;
439
440 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
441 return 0;
442}
443
444/* change current fan state - is overwritten when running in kernel mode */
445static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
446 unsigned long state)
447{
448 int cur_temp, cur_state, err = 0;
449
450 if (!kernelmode)
451 return 0;
452
453 err = acerhdf_get_temp(&cur_temp);
454 if (err) {
455 pr_err("error reading temperature, hand off control to BIOS\n");
456 goto err_out;
457 }
458
459 err = acerhdf_get_fanstate(&cur_state);
460 if (err) {
461 pr_err("error reading fan state, hand off control to BIOS\n");
462 goto err_out;
463 }
464
465 if (state == 0) {
466 /* turn fan off only if below fanoff temperature */
467 if ((cur_state == ACERHDF_FAN_AUTO) &&
468 (cur_temp < fanoff))
469 acerhdf_change_fanstate(ACERHDF_FAN_OFF);
470 } else {
471 if (cur_state == ACERHDF_FAN_OFF)
472 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
473 }
474 return 0;
475
476err_out:
477 acerhdf_revert_to_bios_mode();
478 return -EINVAL;
479}
480
481/* bind fan callbacks to fan device */
482static struct thermal_cooling_device_ops acerhdf_cooling_ops = {
483 .get_max_state = acerhdf_get_max_state,
484 .get_cur_state = acerhdf_get_cur_state,
485 .set_cur_state = acerhdf_set_cur_state,
486};
487
488/* suspend / resume functionality */
489static int acerhdf_suspend(struct device *dev)
490{
491 if (kernelmode)
492 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
493
494 if (verbose)
495 pr_notice("going suspend\n");
496
497 return 0;
498}
499
500static int __devinit acerhdf_probe(struct platform_device *device)
501{
502 return 0;
503}
504
505static int acerhdf_remove(struct platform_device *device)
506{
507 return 0;
508}
509
510static const struct dev_pm_ops acerhdf_pm_ops = {
511 .suspend = acerhdf_suspend,
512 .freeze = acerhdf_suspend,
513};
514
515static struct platform_driver acerhdf_driver = {
516 .driver = {
517 .name = "acerhdf",
518 .owner = THIS_MODULE,
519 .pm = &acerhdf_pm_ops,
520 },
521 .probe = acerhdf_probe,
522 .remove = acerhdf_remove,
523};
524
525/* checks if str begins with start */
526static int str_starts_with(const char *str, const char *start)
527{
528 unsigned long str_len = 0, start_len = 0;
529
530 str_len = strlen(str);
531 start_len = strlen(start);
532
533 if (str_len >= start_len &&
534 !strncmp(str, start, start_len))
535 return 1;
536
537 return 0;
538}
539
540/* check hardware */
541static int acerhdf_check_hardware(void)
542{
543 char const *vendor, *version, *product;
544 const struct bios_settings_t *bt = NULL;
545
546 /* get BIOS data */
547 vendor = dmi_get_system_info(DMI_SYS_VENDOR);
548 version = dmi_get_system_info(DMI_BIOS_VERSION);
549 product = dmi_get_system_info(DMI_PRODUCT_NAME);
550
551 if (!vendor || !version || !product) {
552 pr_err("error getting hardware information\n");
553 return -EINVAL;
554 }
555
556 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
557
558 if (force_bios[0]) {
559 version = force_bios;
560 pr_info("forcing BIOS version: %s\n", version);
561 kernelmode = 0;
562 }
563
564 if (force_product[0]) {
565 product = force_product;
566 pr_info("forcing BIOS product: %s\n", product);
567 kernelmode = 0;
568 }
569
570 if (verbose)
571 pr_info("BIOS info: %s %s, product: %s\n",
572 vendor, version, product);
573
574 /* search BIOS version and vendor in BIOS settings table */
575 for (bt = bios_tbl; bt->vendor[0]; bt++) {
576 /*
577 * check if actual hardware BIOS vendor, product and version
578 * IDs start with the strings of BIOS table entry
579 */
580 if (str_starts_with(vendor, bt->vendor) &&
581 str_starts_with(product, bt->product) &&
582 str_starts_with(version, bt->version)) {
583 bios_cfg = bt;
584 break;
585 }
586 }
587
588 if (!bios_cfg) {
589 pr_err("unknown (unsupported) BIOS version %s/%s/%s, "
590 "please report, aborting!\n", vendor, product, version);
591 return -EINVAL;
592 }
593
594 /*
595 * if started with kernel mode off, prevent the kernel from switching
596 * off the fan
597 */
598 if (!kernelmode) {
599 pr_notice("Fan control off, to enable do:\n");
600 pr_notice("echo -n \"enabled\" > "
601 "/sys/class/thermal/thermal_zone0/mode\n");
602 }
603
604 return 0;
605}
606
607static int acerhdf_register_platform(void)
608{
609 int err = 0;
610
611 err = platform_driver_register(&acerhdf_driver);
612 if (err)
613 return err;
614
615 acerhdf_dev = platform_device_alloc("acerhdf", -1);
616 if (!acerhdf_dev) {
617 err = -ENOMEM;
618 goto err_device_alloc;
619 }
620 err = platform_device_add(acerhdf_dev);
621 if (err)
622 goto err_device_add;
623
624 return 0;
625
626err_device_add:
627 platform_device_put(acerhdf_dev);
628err_device_alloc:
629 platform_driver_unregister(&acerhdf_driver);
630 return err;
631}
632
633static void acerhdf_unregister_platform(void)
634{
635 platform_device_unregister(acerhdf_dev);
636 platform_driver_unregister(&acerhdf_driver);
637}
638
639static int acerhdf_register_thermal(void)
640{
641 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
642 &acerhdf_cooling_ops);
643
644 if (IS_ERR(cl_dev))
645 return -EINVAL;
646
647 thz_dev = thermal_zone_device_register("acerhdf", 1, NULL,
648 &acerhdf_dev_ops, 0, 0, 0,
649 (kernelmode) ? interval*1000 : 0);
650 if (IS_ERR(thz_dev))
651 return -EINVAL;
652
653 return 0;
654}
655
656static void acerhdf_unregister_thermal(void)
657{
658 if (cl_dev) {
659 thermal_cooling_device_unregister(cl_dev);
660 cl_dev = NULL;
661 }
662
663 if (thz_dev) {
664 thermal_zone_device_unregister(thz_dev);
665 thz_dev = NULL;
666 }
667}
668
669static int __init acerhdf_init(void)
670{
671 int err = 0;
672
673 err = acerhdf_check_hardware();
674 if (err)
675 goto out_err;
676
677 err = acerhdf_register_platform();
678 if (err)
679 goto out_err;
680
681 err = acerhdf_register_thermal();
682 if (err)
683 goto err_unreg;
684
685 return 0;
686
687err_unreg:
688 acerhdf_unregister_thermal();
689 acerhdf_unregister_platform();
690
691out_err:
692 return err;
693}
694
695static void __exit acerhdf_exit(void)
696{
697 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
698 acerhdf_unregister_thermal();
699 acerhdf_unregister_platform();
700}
701
702MODULE_LICENSE("GPL");
703MODULE_AUTHOR("Peter Feuerer");
704MODULE_DESCRIPTION("Aspire One temperature and fan driver");
705MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
706MODULE_ALIAS("dmi:*:*Acer*:pnAspire 1410*:");
707MODULE_ALIAS("dmi:*:*Acer*:pnAspire 1810*:");
708MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
709MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
710MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
711MODULE_ALIAS("dmi:*:*Packard Bell*:pnAOA*:");
712MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOA*:");
713MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOTMU*:");
714MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOTMA*:");
715
716module_init(acerhdf_init);
717module_exit(acerhdf_exit);