Loading...
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", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00} },
186 /* Acer 531 */
187 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00} },
188 /* Gateway */
189 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00} },
190 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00} },
191 {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x9e, 0x00} },
192 {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x9e, 0x00} },
193 {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x9e, 0x00} },
194 /* Packard Bell */
195 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00} },
196 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} },
197 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00} },
198 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} },
199 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
200 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
201 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
202 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
203 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
204 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
205 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
206 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
207 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00} },
208 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00} },
209 /* pewpew-terminator */
210 {"", "", "", 0, 0, {0, 0} }
211};
212
213static const struct bios_settings_t *bios_cfg __read_mostly;
214
215static int acerhdf_get_temp(int *temp)
216{
217 u8 read_temp;
218
219 if (ec_read(bios_cfg->tempreg, &read_temp))
220 return -EINVAL;
221
222 *temp = read_temp * 1000;
223
224 return 0;
225}
226
227static int acerhdf_get_fanstate(int *state)
228{
229 u8 fan;
230
231 if (ec_read(bios_cfg->fanreg, &fan))
232 return -EINVAL;
233
234 if (fan != bios_cfg->cmd.cmd_off)
235 *state = ACERHDF_FAN_AUTO;
236 else
237 *state = ACERHDF_FAN_OFF;
238
239 return 0;
240}
241
242static void acerhdf_change_fanstate(int state)
243{
244 unsigned char cmd;
245
246 if (verbose)
247 pr_notice("fan %s\n", (state == ACERHDF_FAN_OFF) ?
248 "OFF" : "ON");
249
250 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
251 pr_err("invalid fan state %d requested, setting to auto!\n",
252 state);
253 state = ACERHDF_FAN_AUTO;
254 }
255
256 cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
257 : bios_cfg->cmd.cmd_auto;
258 fanstate = state;
259
260 ec_write(bios_cfg->fanreg, cmd);
261}
262
263static void acerhdf_check_param(struct thermal_zone_device *thermal)
264{
265 if (fanon > ACERHDF_MAX_FANON) {
266 pr_err("fanon temperature too high, set to %d\n",
267 ACERHDF_MAX_FANON);
268 fanon = ACERHDF_MAX_FANON;
269 }
270
271 if (kernelmode && prev_interval != interval) {
272 if (interval > ACERHDF_MAX_INTERVAL) {
273 pr_err("interval too high, set to %d\n",
274 ACERHDF_MAX_INTERVAL);
275 interval = ACERHDF_MAX_INTERVAL;
276 }
277 if (verbose)
278 pr_notice("interval changed to: %d\n",
279 interval);
280 thermal->polling_delay = interval*1000;
281 prev_interval = interval;
282 }
283}
284
285/*
286 * This is the thermal zone callback which does the delayed polling of the fan
287 * state. We do check /sysfs-originating settings here in acerhdf_check_param()
288 * as late as the polling interval is since we can't do that in the respective
289 * accessors of the module parameters.
290 */
291static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
292 unsigned long *t)
293{
294 int temp, err = 0;
295
296 acerhdf_check_param(thermal);
297
298 err = acerhdf_get_temp(&temp);
299 if (err)
300 return err;
301
302 if (verbose)
303 pr_notice("temp %d\n", temp);
304
305 *t = temp;
306 return 0;
307}
308
309static int acerhdf_bind(struct thermal_zone_device *thermal,
310 struct thermal_cooling_device *cdev)
311{
312 /* if the cooling device is the one from acerhdf bind it */
313 if (cdev != cl_dev)
314 return 0;
315
316 if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
317 pr_err("error binding cooling dev\n");
318 return -EINVAL;
319 }
320 return 0;
321}
322
323static int acerhdf_unbind(struct thermal_zone_device *thermal,
324 struct thermal_cooling_device *cdev)
325{
326 if (cdev != cl_dev)
327 return 0;
328
329 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
330 pr_err("error unbinding cooling dev\n");
331 return -EINVAL;
332 }
333 return 0;
334}
335
336static inline void acerhdf_revert_to_bios_mode(void)
337{
338 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
339 kernelmode = 0;
340 if (thz_dev)
341 thz_dev->polling_delay = 0;
342 pr_notice("kernel mode fan control OFF\n");
343}
344static inline void acerhdf_enable_kernelmode(void)
345{
346 kernelmode = 1;
347
348 thz_dev->polling_delay = interval*1000;
349 thermal_zone_device_update(thz_dev);
350 pr_notice("kernel mode fan control ON\n");
351}
352
353static int acerhdf_get_mode(struct thermal_zone_device *thermal,
354 enum thermal_device_mode *mode)
355{
356 if (verbose)
357 pr_notice("kernel mode fan control %d\n", kernelmode);
358
359 *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
360 : THERMAL_DEVICE_DISABLED;
361
362 return 0;
363}
364
365/*
366 * set operation mode;
367 * enabled: the thermal layer of the kernel takes care about
368 * the temperature and the fan.
369 * disabled: the BIOS takes control of the fan.
370 */
371static int acerhdf_set_mode(struct thermal_zone_device *thermal,
372 enum thermal_device_mode mode)
373{
374 if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
375 acerhdf_revert_to_bios_mode();
376 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
377 acerhdf_enable_kernelmode();
378
379 return 0;
380}
381
382static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
383 enum thermal_trip_type *type)
384{
385 if (trip == 0)
386 *type = THERMAL_TRIP_ACTIVE;
387
388 return 0;
389}
390
391static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
392 unsigned long *temp)
393{
394 if (trip == 0)
395 *temp = fanon;
396
397 return 0;
398}
399
400static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
401 unsigned long *temperature)
402{
403 *temperature = ACERHDF_TEMP_CRIT;
404 return 0;
405}
406
407/* bind callback functions to thermalzone */
408static struct thermal_zone_device_ops acerhdf_dev_ops = {
409 .bind = acerhdf_bind,
410 .unbind = acerhdf_unbind,
411 .get_temp = acerhdf_get_ec_temp,
412 .get_mode = acerhdf_get_mode,
413 .set_mode = acerhdf_set_mode,
414 .get_trip_type = acerhdf_get_trip_type,
415 .get_trip_temp = acerhdf_get_trip_temp,
416 .get_crit_temp = acerhdf_get_crit_temp,
417};
418
419
420/*
421 * cooling device callback functions
422 * get maximal fan cooling state
423 */
424static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
425 unsigned long *state)
426{
427 *state = 1;
428
429 return 0;
430}
431
432static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
433 unsigned long *state)
434{
435 int err = 0, tmp;
436
437 err = acerhdf_get_fanstate(&tmp);
438 if (err)
439 return err;
440
441 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
442 return 0;
443}
444
445/* change current fan state - is overwritten when running in kernel mode */
446static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
447 unsigned long state)
448{
449 int cur_temp, cur_state, err = 0;
450
451 if (!kernelmode)
452 return 0;
453
454 err = acerhdf_get_temp(&cur_temp);
455 if (err) {
456 pr_err("error reading temperature, hand off control to BIOS\n");
457 goto err_out;
458 }
459
460 err = acerhdf_get_fanstate(&cur_state);
461 if (err) {
462 pr_err("error reading fan state, hand off control to BIOS\n");
463 goto err_out;
464 }
465
466 if (state == 0) {
467 /* turn fan off only if below fanoff temperature */
468 if ((cur_state == ACERHDF_FAN_AUTO) &&
469 (cur_temp < fanoff))
470 acerhdf_change_fanstate(ACERHDF_FAN_OFF);
471 } else {
472 if (cur_state == ACERHDF_FAN_OFF)
473 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
474 }
475 return 0;
476
477err_out:
478 acerhdf_revert_to_bios_mode();
479 return -EINVAL;
480}
481
482/* bind fan callbacks to fan device */
483static struct thermal_cooling_device_ops acerhdf_cooling_ops = {
484 .get_max_state = acerhdf_get_max_state,
485 .get_cur_state = acerhdf_get_cur_state,
486 .set_cur_state = acerhdf_set_cur_state,
487};
488
489/* suspend / resume functionality */
490static int acerhdf_suspend(struct device *dev)
491{
492 if (kernelmode)
493 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
494
495 if (verbose)
496 pr_notice("going suspend\n");
497
498 return 0;
499}
500
501static int __devinit acerhdf_probe(struct platform_device *device)
502{
503 return 0;
504}
505
506static int acerhdf_remove(struct platform_device *device)
507{
508 return 0;
509}
510
511static const struct dev_pm_ops acerhdf_pm_ops = {
512 .suspend = acerhdf_suspend,
513 .freeze = acerhdf_suspend,
514};
515
516static struct platform_driver acerhdf_driver = {
517 .driver = {
518 .name = "acerhdf",
519 .owner = THIS_MODULE,
520 .pm = &acerhdf_pm_ops,
521 },
522 .probe = acerhdf_probe,
523 .remove = acerhdf_remove,
524};
525
526/* checks if str begins with start */
527static int str_starts_with(const char *str, const char *start)
528{
529 unsigned long str_len = 0, start_len = 0;
530
531 str_len = strlen(str);
532 start_len = strlen(start);
533
534 if (str_len >= start_len &&
535 !strncmp(str, start, start_len))
536 return 1;
537
538 return 0;
539}
540
541/* check hardware */
542static int acerhdf_check_hardware(void)
543{
544 char const *vendor, *version, *product;
545 const struct bios_settings_t *bt = NULL;
546
547 /* get BIOS data */
548 vendor = dmi_get_system_info(DMI_SYS_VENDOR);
549 version = dmi_get_system_info(DMI_BIOS_VERSION);
550 product = dmi_get_system_info(DMI_PRODUCT_NAME);
551
552 if (!vendor || !version || !product) {
553 pr_err("error getting hardware information\n");
554 return -EINVAL;
555 }
556
557 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
558
559 if (force_bios[0]) {
560 version = force_bios;
561 pr_info("forcing BIOS version: %s\n", version);
562 kernelmode = 0;
563 }
564
565 if (force_product[0]) {
566 product = force_product;
567 pr_info("forcing BIOS product: %s\n", product);
568 kernelmode = 0;
569 }
570
571 if (verbose)
572 pr_info("BIOS info: %s %s, product: %s\n",
573 vendor, version, product);
574
575 /* search BIOS version and vendor in BIOS settings table */
576 for (bt = bios_tbl; bt->vendor[0]; bt++) {
577 /*
578 * check if actual hardware BIOS vendor, product and version
579 * IDs start with the strings of BIOS table entry
580 */
581 if (str_starts_with(vendor, bt->vendor) &&
582 str_starts_with(product, bt->product) &&
583 str_starts_with(version, bt->version)) {
584 bios_cfg = bt;
585 break;
586 }
587 }
588
589 if (!bios_cfg) {
590 pr_err("unknown (unsupported) BIOS version %s/%s/%s, "
591 "please report, aborting!\n", vendor, product, version);
592 return -EINVAL;
593 }
594
595 /*
596 * if started with kernel mode off, prevent the kernel from switching
597 * off the fan
598 */
599 if (!kernelmode) {
600 pr_notice("Fan control off, to enable do:\n");
601 pr_notice("echo -n \"enabled\" > "
602 "/sys/class/thermal/thermal_zone0/mode\n");
603 }
604
605 return 0;
606}
607
608static int acerhdf_register_platform(void)
609{
610 int err = 0;
611
612 err = platform_driver_register(&acerhdf_driver);
613 if (err)
614 return err;
615
616 acerhdf_dev = platform_device_alloc("acerhdf", -1);
617 if (!acerhdf_dev) {
618 err = -ENOMEM;
619 goto err_device_alloc;
620 }
621 err = platform_device_add(acerhdf_dev);
622 if (err)
623 goto err_device_add;
624
625 return 0;
626
627err_device_add:
628 platform_device_put(acerhdf_dev);
629err_device_alloc:
630 platform_driver_unregister(&acerhdf_driver);
631 return err;
632}
633
634static void acerhdf_unregister_platform(void)
635{
636 platform_device_unregister(acerhdf_dev);
637 platform_driver_unregister(&acerhdf_driver);
638}
639
640static int acerhdf_register_thermal(void)
641{
642 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
643 &acerhdf_cooling_ops);
644
645 if (IS_ERR(cl_dev))
646 return -EINVAL;
647
648 thz_dev = thermal_zone_device_register("acerhdf", 1, NULL,
649 &acerhdf_dev_ops, 0, 0, 0,
650 (kernelmode) ? interval*1000 : 0);
651 if (IS_ERR(thz_dev))
652 return -EINVAL;
653
654 return 0;
655}
656
657static void acerhdf_unregister_thermal(void)
658{
659 if (cl_dev) {
660 thermal_cooling_device_unregister(cl_dev);
661 cl_dev = NULL;
662 }
663
664 if (thz_dev) {
665 thermal_zone_device_unregister(thz_dev);
666 thz_dev = NULL;
667 }
668}
669
670static int __init acerhdf_init(void)
671{
672 int err = 0;
673
674 err = acerhdf_check_hardware();
675 if (err)
676 goto out_err;
677
678 err = acerhdf_register_platform();
679 if (err)
680 goto out_err;
681
682 err = acerhdf_register_thermal();
683 if (err)
684 goto err_unreg;
685
686 return 0;
687
688err_unreg:
689 acerhdf_unregister_thermal();
690 acerhdf_unregister_platform();
691
692out_err:
693 return err;
694}
695
696static void __exit acerhdf_exit(void)
697{
698 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
699 acerhdf_unregister_thermal();
700 acerhdf_unregister_platform();
701}
702
703MODULE_LICENSE("GPL");
704MODULE_AUTHOR("Peter Feuerer");
705MODULE_DESCRIPTION("Aspire One temperature and fan driver");
706MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
707MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
708MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
709MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
710MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
711MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
712MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
713MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
714MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
715MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
716
717module_init(acerhdf_init);
718module_exit(acerhdf_exit);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acerhdf - A driver which monitors the temperature
4 * of the aspire one netbook, turns on/off the fan
5 * as soon as the upper/lower threshold is reached.
6 *
7 * (C) 2009 - Peter Kaestle peter (a) piie.net
8 * https://piie.net
9 * 2009 Borislav Petkov bp (a) alien8.de
10 *
11 * Inspired by and many thanks to:
12 * o acerfand - Rachel Greenham
13 * o acer_ec.pl - Michael Kurz michi.kurz (at) googlemail.com
14 * - Petr Tomasek tomasek (#) etf,cuni,cz
15 * - Carlos Corbacho cathectic (at) gmail.com
16 * o lkml - Matthew Garrett
17 * - Borislav Petkov
18 * - Andreas Mohr
19 */
20
21#define pr_fmt(fmt) "acerhdf: " fmt
22
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/dmi.h>
26#include <linux/acpi.h>
27#include <linux/thermal.h>
28#include <linux/platform_device.h>
29
30/*
31 * The driver is started with "kernel mode off" by default. That means, the BIOS
32 * is still in control of the fan. In this mode the driver allows to read the
33 * temperature of the cpu and a userspace tool may take over control of the fan.
34 * If the driver is switched to "kernel mode" (e.g. via module parameter) the
35 * driver is in full control of the fan. If you want the module to be started in
36 * kernel mode by default, define the following:
37 */
38#undef START_IN_KERNEL_MODE
39
40#define DRV_VER "0.7.0"
41
42/*
43 * According to the Atom N270 datasheet,
44 * (http://download.intel.com/design/processor/datashts/320032.pdf) the
45 * CPU's optimal operating limits denoted in junction temperature as
46 * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So,
47 * assume 89°C is critical temperature.
48 */
49#define ACERHDF_DEFAULT_TEMP_FANON 60000
50#define ACERHDF_DEFAULT_TEMP_FANOFF 53000
51#define ACERHDF_TEMP_CRIT 89000
52#define ACERHDF_FAN_OFF 0
53#define ACERHDF_FAN_AUTO 1
54
55/*
56 * No matter what value the user puts into the fanon variable, turn on the fan
57 * at 80 degree Celsius to prevent hardware damage
58 */
59#define ACERHDF_MAX_FANON 80000
60
61/*
62 * Maximum interval between two temperature checks is 15 seconds, as the die
63 * can get hot really fast under heavy load (plus we shouldn't forget about
64 * possible impact of _external_ aggressive sources such as heaters, sun etc.)
65 */
66#define ACERHDF_MAX_INTERVAL 15
67
68#ifdef START_IN_KERNEL_MODE
69static int kernelmode = 1;
70#else
71static int kernelmode;
72#endif
73
74static unsigned int interval = 10;
75static unsigned int fanon = ACERHDF_DEFAULT_TEMP_FANON;
76static unsigned int fanoff = ACERHDF_DEFAULT_TEMP_FANOFF;
77static unsigned int verbose;
78static unsigned int list_supported;
79static unsigned int fanstate = ACERHDF_FAN_AUTO;
80static char force_bios[16];
81static char force_product[16];
82static struct thermal_zone_device *thz_dev;
83static struct thermal_cooling_device *cl_dev;
84static struct platform_device *acerhdf_dev;
85
86module_param(kernelmode, uint, 0);
87MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
88module_param(fanon, uint, 0600);
89MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
90module_param(fanoff, uint, 0600);
91MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
92module_param(verbose, uint, 0600);
93MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
94module_param(list_supported, uint, 0600);
95MODULE_PARM_DESC(list_supported, "List supported models and BIOS versions");
96module_param_string(force_bios, force_bios, 16, 0);
97MODULE_PARM_DESC(force_bios, "Pretend system has this known supported BIOS version");
98module_param_string(force_product, force_product, 16, 0);
99MODULE_PARM_DESC(force_product, "Pretend system is this known supported model");
100
101/*
102 * cmd_off: to switch the fan completely off and check if the fan is off
103 * cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
104 * the fan speed depending on the temperature
105 */
106struct fancmd {
107 u8 cmd_off;
108 u8 cmd_auto;
109};
110
111struct manualcmd {
112 u8 mreg;
113 u8 moff;
114};
115
116/* default register and command to disable fan in manual mode */
117static const struct manualcmd mcmd = {
118 .mreg = 0x94,
119 .moff = 0xff,
120};
121
122/* BIOS settings - only used during probe */
123struct bios_settings {
124 const char *vendor;
125 const char *product;
126 const char *version;
127 u8 fanreg;
128 u8 tempreg;
129 struct fancmd cmd;
130 int mcmd_enable;
131};
132
133/* This could be a daughter struct in the above, but not worth the redirect */
134struct ctrl_settings {
135 u8 fanreg;
136 u8 tempreg;
137 struct fancmd cmd;
138 int mcmd_enable;
139};
140
141static struct thermal_trip trips[] = {
142 [0] = { .temperature = ACERHDF_DEFAULT_TEMP_FANON,
143 .hysteresis = ACERHDF_DEFAULT_TEMP_FANON - ACERHDF_DEFAULT_TEMP_FANOFF,
144 .type = THERMAL_TRIP_ACTIVE },
145
146 [1] = { .temperature = ACERHDF_TEMP_CRIT,
147 .type = THERMAL_TRIP_CRITICAL }
148};
149
150static struct ctrl_settings ctrl_cfg __read_mostly;
151
152/* Register addresses and values for different BIOS versions */
153static const struct bios_settings bios_tbl[] __initconst = {
154 /* AOA110 */
155 {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00}, 0},
156 {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
157 {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00}, 0},
158 {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00}, 0},
159 {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00}, 0},
160 {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00}, 0},
161 {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00}, 0},
162 {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00}, 0},
163 {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00}, 0},
164 /* AOA150 */
165 {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
166 {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00}, 0},
167 {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
168 {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00}, 0},
169 {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00}, 0},
170 {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00}, 0},
171 {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00}, 0},
172 {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
173 /* LT1005u */
174 {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
175 /* Acer 1410 */
176 {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
177 {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
178 {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
179 {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
180 {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
181 {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
182 {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
183 {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
184 {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
185 {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
186 {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
187 /* Acer 1810xx */
188 {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
189 {"Acer", "Aspire 1810T", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
190 {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
191 {"Acer", "Aspire 1810T", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
192 {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
193 {"Acer", "Aspire 1810T", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
194 {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
195 {"Acer", "Aspire 1810T", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
196 {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
197 {"Acer", "Aspire 1810T", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
198 {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
199 {"Acer", "Aspire 1810T", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
200 {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
201 {"Acer", "Aspire 1810T", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
202 {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
203 {"Acer", "Aspire 1810T", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
204 {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
205 {"Acer", "Aspire 1810T", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
206 {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
207 {"Acer", "Aspire 1810T", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
208 {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
209 {"Acer", "Aspire 1810T", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
210 /* Acer 5755G */
211 {"Acer", "Aspire 5755G", "V1.20", 0xab, 0xb4, {0x00, 0x08}, 0},
212 {"Acer", "Aspire 5755G", "V1.21", 0xab, 0xb3, {0x00, 0x08}, 0},
213 /* Acer 521 */
214 {"Acer", "AO521", "V1.11", 0x55, 0x58, {0x1f, 0x00}, 0},
215 /* Acer 531 */
216 {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00}, 0},
217 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00}, 0},
218 {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
219 /* Acer 751 */
220 {"Acer", "AO751h", "V0.3206", 0x55, 0x58, {0x21, 0x00}, 0},
221 {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00}, 0},
222 /* Acer 753 */
223 {"Acer", "Aspire One 753", "V1.24", 0x93, 0xac, {0x14, 0x04}, 1},
224 /* Acer 1825 */
225 {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0},
226 {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0},
227 /* Acer Extensa 5420 */
228 {"Acer", "Extensa 5420", "V1.17", 0x93, 0xac, {0x14, 0x04}, 1},
229 /* Acer Aspire 5315 */
230 {"Acer", "Aspire 5315", "V1.19", 0x93, 0xac, {0x14, 0x04}, 1},
231 /* Acer Aspire 5739 */
232 {"Acer", "Aspire 5739G", "V1.3311", 0x55, 0x58, {0x20, 0x00}, 0},
233 /* Acer TravelMate 7730 */
234 {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00}, 0},
235 /* Acer Aspire 7551 */
236 {"Acer", "Aspire 7551", "V1.18", 0x93, 0xa8, {0x14, 0x04}, 1},
237 /* Acer TravelMate TM8573T */
238 {"Acer", "TM8573T", "V1.13", 0x93, 0xa8, {0x14, 0x04}, 1},
239 /* Gateway */
240 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00}, 0},
241 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00}, 0},
242 {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x9e, 0x00}, 0},
243 {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0},
244 {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0},
245 {"Gateway", "LT31", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
246 {"Gateway", "LT31", "v1.3307", 0x55, 0x58, {0x9e, 0x00}, 0},
247 /* Packard Bell */
248 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00}, 0},
249 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0},
250 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00}, 0},
251 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0},
252 {"Packard Bell", "ENBFT", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0},
253 {"Packard Bell", "ENBFT", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0},
254 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
255 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
256 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
257 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
258 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
259 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
260 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
261 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
262 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0},
263 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0},
264 {"Packard Bell", "DOTMA", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
265 {"Packard Bell", "DOTVR46", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
266 /* pewpew-terminator */
267 {"", "", "", 0, 0, {0, 0}, 0}
268};
269
270/*
271 * this struct is used to instruct thermal layer to use bang_bang instead of
272 * default governor for acerhdf
273 */
274static struct thermal_zone_params acerhdf_zone_params = {
275 .governor_name = "bang_bang",
276};
277
278static int acerhdf_get_temp(int *temp)
279{
280 u8 read_temp;
281
282 if (ec_read(ctrl_cfg.tempreg, &read_temp))
283 return -EINVAL;
284
285 *temp = read_temp * 1000;
286
287 return 0;
288}
289
290static int acerhdf_get_fanstate(int *state)
291{
292 u8 fan;
293
294 if (ec_read(ctrl_cfg.fanreg, &fan))
295 return -EINVAL;
296
297 if (fan != ctrl_cfg.cmd.cmd_off)
298 *state = ACERHDF_FAN_AUTO;
299 else
300 *state = ACERHDF_FAN_OFF;
301
302 return 0;
303}
304
305static void acerhdf_change_fanstate(int state)
306{
307 unsigned char cmd;
308
309 if (verbose)
310 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON");
311
312 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
313 pr_err("invalid fan state %d requested, setting to auto!\n",
314 state);
315 state = ACERHDF_FAN_AUTO;
316 }
317
318 cmd = (state == ACERHDF_FAN_OFF) ? ctrl_cfg.cmd.cmd_off
319 : ctrl_cfg.cmd.cmd_auto;
320 fanstate = state;
321
322 ec_write(ctrl_cfg.fanreg, cmd);
323
324 if (ctrl_cfg.mcmd_enable && state == ACERHDF_FAN_OFF) {
325 if (verbose)
326 pr_notice("turning off fan manually\n");
327 ec_write(mcmd.mreg, mcmd.moff);
328 }
329}
330
331static void acerhdf_check_param(struct thermal_zone_device *thermal)
332{
333 if (fanon > ACERHDF_MAX_FANON) {
334 pr_err("fanon temperature too high, set to %d\n",
335 ACERHDF_MAX_FANON);
336 fanon = ACERHDF_MAX_FANON;
337 }
338
339 if (fanon < fanoff) {
340 pr_err("fanoff temperature (%d) is above fanon temperature (%d), clamping to %d\n",
341 fanoff, fanon, fanon);
342 fanoff = fanon;
343 }
344
345 trips[0].temperature = fanon;
346 trips[0].hysteresis = fanon - fanoff;
347
348 if (kernelmode) {
349 if (interval > ACERHDF_MAX_INTERVAL) {
350 pr_err("interval too high, set to %d\n",
351 ACERHDF_MAX_INTERVAL);
352 interval = ACERHDF_MAX_INTERVAL;
353 }
354
355 if (verbose)
356 pr_notice("interval changed to: %d\n", interval);
357 }
358}
359
360/*
361 * This is the thermal zone callback which does the delayed polling of the fan
362 * state. We do check /sysfs-originating settings here in acerhdf_check_param()
363 * as late as the polling interval is since we can't do that in the respective
364 * accessors of the module parameters.
365 */
366static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t)
367{
368 int temp, err = 0;
369
370 err = acerhdf_get_temp(&temp);
371 if (err)
372 return err;
373
374 if (verbose)
375 pr_notice("temp %d\n", temp);
376
377 *t = temp;
378 return 0;
379}
380
381static bool acerhdf_should_bind(struct thermal_zone_device *thermal,
382 const struct thermal_trip *trip,
383 struct thermal_cooling_device *cdev,
384 struct cooling_spec *c)
385{
386 /* if the cooling device is the one from acerhdf bind it */
387 return cdev == cl_dev && trip->type == THERMAL_TRIP_ACTIVE;
388}
389
390static inline void acerhdf_revert_to_bios_mode(void)
391{
392 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
393 kernelmode = 0;
394
395 pr_notice("kernel mode fan control OFF\n");
396}
397static inline void acerhdf_enable_kernelmode(void)
398{
399 kernelmode = 1;
400
401 pr_notice("kernel mode fan control ON\n");
402}
403
404/*
405 * set operation mode;
406 * enabled: the thermal layer of the kernel takes care about
407 * the temperature and the fan.
408 * disabled: the BIOS takes control of the fan.
409 */
410static int acerhdf_change_mode(struct thermal_zone_device *thermal,
411 enum thermal_device_mode mode)
412{
413 if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
414 acerhdf_revert_to_bios_mode();
415 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
416 acerhdf_enable_kernelmode();
417
418 return 0;
419}
420
421static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
422 int *temperature)
423{
424 *temperature = ACERHDF_TEMP_CRIT;
425 return 0;
426}
427
428/* bind callback functions to thermalzone */
429static struct thermal_zone_device_ops acerhdf_dev_ops = {
430 .should_bind = acerhdf_should_bind,
431 .get_temp = acerhdf_get_ec_temp,
432 .change_mode = acerhdf_change_mode,
433 .get_crit_temp = acerhdf_get_crit_temp,
434};
435
436/*
437 * cooling device callback functions
438 * get maximal fan cooling state
439 */
440static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
441 unsigned long *state)
442{
443 *state = 1;
444
445 return 0;
446}
447
448static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
449 unsigned long *state)
450{
451 int err = 0, tmp;
452
453 err = acerhdf_get_fanstate(&tmp);
454 if (err)
455 return err;
456
457 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
458 return 0;
459}
460
461/* change current fan state - is overwritten when running in kernel mode */
462static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
463 unsigned long state)
464{
465 int cur_temp, cur_state, err = 0;
466
467 if (!kernelmode)
468 return 0;
469
470 err = acerhdf_get_temp(&cur_temp);
471 if (err) {
472 pr_err("error reading temperature, hand off control to BIOS\n");
473 goto err_out;
474 }
475
476 err = acerhdf_get_fanstate(&cur_state);
477 if (err) {
478 pr_err("error reading fan state, hand off control to BIOS\n");
479 goto err_out;
480 }
481
482 if (state == 0) {
483 if (cur_state == ACERHDF_FAN_AUTO)
484 acerhdf_change_fanstate(ACERHDF_FAN_OFF);
485 } else {
486 if (cur_state == ACERHDF_FAN_OFF)
487 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
488 }
489 return 0;
490
491err_out:
492 acerhdf_revert_to_bios_mode();
493 return -EINVAL;
494}
495
496/* bind fan callbacks to fan device */
497static const struct thermal_cooling_device_ops acerhdf_cooling_ops = {
498 .get_max_state = acerhdf_get_max_state,
499 .get_cur_state = acerhdf_get_cur_state,
500 .set_cur_state = acerhdf_set_cur_state,
501};
502
503/* suspend / resume functionality */
504static int acerhdf_suspend(struct device *dev)
505{
506 if (kernelmode)
507 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
508
509 if (verbose)
510 pr_notice("going suspend\n");
511
512 return 0;
513}
514
515static int acerhdf_probe(struct platform_device *device)
516{
517 return 0;
518}
519
520static const struct dev_pm_ops acerhdf_pm_ops = {
521 .suspend = acerhdf_suspend,
522 .freeze = acerhdf_suspend,
523};
524
525static struct platform_driver acerhdf_driver = {
526 .driver = {
527 .name = "acerhdf",
528 .pm = &acerhdf_pm_ops,
529 },
530 .probe = acerhdf_probe,
531};
532
533/* check hardware */
534static int __init acerhdf_check_hardware(void)
535{
536 char const *vendor, *version, *product;
537 const struct bios_settings *bt = NULL;
538 int found = 0;
539
540 /* get BIOS data */
541 vendor = dmi_get_system_info(DMI_SYS_VENDOR);
542 version = dmi_get_system_info(DMI_BIOS_VERSION);
543 product = dmi_get_system_info(DMI_PRODUCT_NAME);
544
545 if (!vendor || !version || !product) {
546 pr_err("error getting hardware information\n");
547 return -EINVAL;
548 }
549
550 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
551
552 if (list_supported) {
553 pr_info("List of supported Manufacturer/Model/BIOS:\n");
554 pr_info("---------------------------------------------------\n");
555 for (bt = bios_tbl; bt->vendor[0]; bt++) {
556 pr_info("%-13s | %-17s | %-10s\n", bt->vendor,
557 bt->product, bt->version);
558 }
559 pr_info("---------------------------------------------------\n");
560 return -ECANCELED;
561 }
562
563 if (force_bios[0]) {
564 version = force_bios;
565 pr_info("forcing BIOS version: %s\n", version);
566 kernelmode = 0;
567 }
568
569 if (force_product[0]) {
570 product = force_product;
571 pr_info("forcing BIOS product: %s\n", product);
572 kernelmode = 0;
573 }
574
575 if (verbose)
576 pr_info("BIOS info: %s %s, product: %s\n",
577 vendor, version, product);
578
579 /* search BIOS version and vendor in BIOS settings table */
580 for (bt = bios_tbl; bt->vendor[0]; bt++) {
581 /*
582 * check if actual hardware BIOS vendor, product and version
583 * IDs start with the strings of BIOS table entry
584 */
585 if (strstarts(vendor, bt->vendor) &&
586 strstarts(product, bt->product) &&
587 strstarts(version, bt->version)) {
588 found = 1;
589 break;
590 }
591 }
592
593 if (!found) {
594 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
595 vendor, product, version);
596 return -EINVAL;
597 }
598
599 /* Copy control settings from BIOS table before we free it. */
600 ctrl_cfg.fanreg = bt->fanreg;
601 ctrl_cfg.tempreg = bt->tempreg;
602 memcpy(&ctrl_cfg.cmd, &bt->cmd, sizeof(struct fancmd));
603 ctrl_cfg.mcmd_enable = bt->mcmd_enable;
604
605 /*
606 * if started with kernel mode off, prevent the kernel from switching
607 * off the fan
608 */
609 if (!kernelmode) {
610 pr_notice("Fan control off, to enable do:\n");
611 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zoneN/mode # N=0,1,2...\n");
612 }
613
614 return 0;
615}
616
617static int __init acerhdf_register_platform(void)
618{
619 int err = 0;
620
621 err = platform_driver_register(&acerhdf_driver);
622 if (err)
623 return err;
624
625 acerhdf_dev = platform_device_alloc("acerhdf", PLATFORM_DEVID_NONE);
626 if (!acerhdf_dev) {
627 err = -ENOMEM;
628 goto err_device_alloc;
629 }
630 err = platform_device_add(acerhdf_dev);
631 if (err)
632 goto err_device_add;
633
634 return 0;
635
636err_device_add:
637 platform_device_put(acerhdf_dev);
638err_device_alloc:
639 platform_driver_unregister(&acerhdf_driver);
640 return err;
641}
642
643static void acerhdf_unregister_platform(void)
644{
645 platform_device_unregister(acerhdf_dev);
646 platform_driver_unregister(&acerhdf_driver);
647}
648
649static int __init acerhdf_register_thermal(void)
650{
651 int ret;
652
653 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
654 &acerhdf_cooling_ops);
655
656 if (IS_ERR(cl_dev))
657 return -EINVAL;
658
659 thz_dev = thermal_zone_device_register_with_trips("acerhdf", trips, ARRAY_SIZE(trips),
660 NULL, &acerhdf_dev_ops,
661 &acerhdf_zone_params, 0,
662 (kernelmode) ? interval*1000 : 0);
663 if (IS_ERR(thz_dev))
664 return -EINVAL;
665
666 if (kernelmode)
667 ret = thermal_zone_device_enable(thz_dev);
668 else
669 ret = thermal_zone_device_disable(thz_dev);
670 if (ret)
671 return ret;
672
673 return 0;
674}
675
676static void acerhdf_unregister_thermal(void)
677{
678 if (cl_dev) {
679 thermal_cooling_device_unregister(cl_dev);
680 cl_dev = NULL;
681 }
682
683 if (thz_dev) {
684 thermal_zone_device_unregister(thz_dev);
685 thz_dev = NULL;
686 }
687}
688
689static int __init acerhdf_init(void)
690{
691 int err = 0;
692
693 err = acerhdf_check_hardware();
694 if (err)
695 goto out_err;
696
697 err = acerhdf_register_platform();
698 if (err)
699 goto out_err;
700
701 err = acerhdf_register_thermal();
702 if (err)
703 goto err_unreg;
704
705 return 0;
706
707err_unreg:
708 acerhdf_unregister_thermal();
709 acerhdf_unregister_platform();
710
711out_err:
712 return err;
713}
714
715static void __exit acerhdf_exit(void)
716{
717 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
718 acerhdf_unregister_thermal();
719 acerhdf_unregister_platform();
720}
721
722MODULE_LICENSE("GPL");
723MODULE_AUTHOR("Peter Kaestle");
724MODULE_DESCRIPTION("Aspire One temperature and fan driver");
725MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
726MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
727MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
728MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
729MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:");
730MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
731MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:");
732MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
733MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:");
734MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:");
735MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:");
736MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
737MODULE_ALIAS("dmi:*:*Acer*:pnAspire*7551:");
738MODULE_ALIAS("dmi:*:*Acer*:TM8573T:");
739MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
740MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
741MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
742MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
743MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
744MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
745MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
746MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
747MODULE_ALIAS("dmi:*:*Acer*:pnExtensa*5420*:");
748
749module_init(acerhdf_init);
750module_exit(acerhdf_exit);
751
752static int interval_set_uint(const char *val, const struct kernel_param *kp)
753{
754 int ret;
755
756 ret = param_set_uint(val, kp);
757 if (ret)
758 return ret;
759
760 acerhdf_check_param(thz_dev);
761
762 return 0;
763}
764
765static const struct kernel_param_ops interval_ops = {
766 .set = interval_set_uint,
767 .get = param_get_uint,
768};
769
770module_param_cb(interval, &interval_ops, &interval, 0000);
771MODULE_PARM_DESC(interval, "Polling interval of temperature check");