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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/*
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 bp (a) alien8.de
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 "0.5.26"
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 = 60000;
87static unsigned int fanoff = 53000;
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 /* LT1005u */
154 {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00} },
155 /* Acer 1410 */
156 {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
157 {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
158 {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
159 {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
160 {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
161 {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
162 {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
163 {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
164 {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
165 {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
166 {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00} },
167 /* Acer 1810xx */
168 {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
169 {"Acer", "Aspire 1810T", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
170 {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
171 {"Acer", "Aspire 1810T", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
172 {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
173 {"Acer", "Aspire 1810T", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
174 {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
175 {"Acer", "Aspire 1810T", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
176 {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
177 {"Acer", "Aspire 1810T", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
178 {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
179 {"Acer", "Aspire 1810T", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
180 {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
181 {"Acer", "Aspire 1810T", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
182 {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
183 {"Acer", "Aspire 1810T", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
184 {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
185 {"Acer", "Aspire 1810T", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
186 {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
187 {"Acer", "Aspire 1810T", "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
188 {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00} },
189 {"Acer", "Aspire 1810T", "v1.3314", 0x55, 0x58, {0x9e, 0x00} },
190 /* Acer 531 */
191 {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00} },
192 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00} },
193 {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00} },
194 /* Acer 751 */
195 {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00} },
196 /* Acer 1825 */
197 {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00} },
198 {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00} },
199 /* Acer TravelMate 7730 */
200 {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00} },
201 /* Gateway */
202 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00} },
203 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00} },
204 {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x9e, 0x00} },
205 {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x9e, 0x00} },
206 {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x9e, 0x00} },
207 {"Gateway", "LT31", "v1.3303t", 0x55, 0x58, {0x9e, 0x00} },
208 /* Packard Bell */
209 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00} },
210 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} },
211 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00} },
212 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} },
213 {"Packard Bell", "ENBFT", "V1.3118", 0x55, 0x58, {0x9e, 0x00} },
214 {"Packard Bell", "ENBFT", "V1.3127", 0x55, 0x58, {0x9e, 0x00} },
215 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
216 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
217 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
218 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
219 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
220 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
221 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
222 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
223 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00} },
224 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00} },
225 {"Packard Bell", "DOTMA", "v1.3303t", 0x55, 0x58, {0x9e, 0x00} },
226 {"Packard Bell", "DOTVR46", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
227 /* pewpew-terminator */
228 {"", "", "", 0, 0, {0, 0} }
229};
230
231static const struct bios_settings_t *bios_cfg __read_mostly;
232
233static int acerhdf_get_temp(int *temp)
234{
235 u8 read_temp;
236
237 if (ec_read(bios_cfg->tempreg, &read_temp))
238 return -EINVAL;
239
240 *temp = read_temp * 1000;
241
242 return 0;
243}
244
245static int acerhdf_get_fanstate(int *state)
246{
247 u8 fan;
248
249 if (ec_read(bios_cfg->fanreg, &fan))
250 return -EINVAL;
251
252 if (fan != bios_cfg->cmd.cmd_off)
253 *state = ACERHDF_FAN_AUTO;
254 else
255 *state = ACERHDF_FAN_OFF;
256
257 return 0;
258}
259
260static void acerhdf_change_fanstate(int state)
261{
262 unsigned char cmd;
263
264 if (verbose)
265 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON");
266
267 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
268 pr_err("invalid fan state %d requested, setting to auto!\n",
269 state);
270 state = ACERHDF_FAN_AUTO;
271 }
272
273 cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
274 : bios_cfg->cmd.cmd_auto;
275 fanstate = state;
276
277 ec_write(bios_cfg->fanreg, cmd);
278}
279
280static void acerhdf_check_param(struct thermal_zone_device *thermal)
281{
282 if (fanon > ACERHDF_MAX_FANON) {
283 pr_err("fanon temperature too high, set to %d\n",
284 ACERHDF_MAX_FANON);
285 fanon = ACERHDF_MAX_FANON;
286 }
287
288 if (kernelmode && prev_interval != interval) {
289 if (interval > ACERHDF_MAX_INTERVAL) {
290 pr_err("interval too high, set to %d\n",
291 ACERHDF_MAX_INTERVAL);
292 interval = ACERHDF_MAX_INTERVAL;
293 }
294 if (verbose)
295 pr_notice("interval changed to: %d\n", interval);
296 thermal->polling_delay = interval*1000;
297 prev_interval = interval;
298 }
299}
300
301/*
302 * This is the thermal zone callback which does the delayed polling of the fan
303 * state. We do check /sysfs-originating settings here in acerhdf_check_param()
304 * as late as the polling interval is since we can't do that in the respective
305 * accessors of the module parameters.
306 */
307static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
308 unsigned long *t)
309{
310 int temp, err = 0;
311
312 acerhdf_check_param(thermal);
313
314 err = acerhdf_get_temp(&temp);
315 if (err)
316 return err;
317
318 if (verbose)
319 pr_notice("temp %d\n", temp);
320
321 *t = temp;
322 return 0;
323}
324
325static int acerhdf_bind(struct thermal_zone_device *thermal,
326 struct thermal_cooling_device *cdev)
327{
328 /* if the cooling device is the one from acerhdf bind it */
329 if (cdev != cl_dev)
330 return 0;
331
332 if (thermal_zone_bind_cooling_device(thermal, 0, cdev,
333 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT)) {
334 pr_err("error binding cooling dev\n");
335 return -EINVAL;
336 }
337 return 0;
338}
339
340static int acerhdf_unbind(struct thermal_zone_device *thermal,
341 struct thermal_cooling_device *cdev)
342{
343 if (cdev != cl_dev)
344 return 0;
345
346 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
347 pr_err("error unbinding cooling dev\n");
348 return -EINVAL;
349 }
350 return 0;
351}
352
353static inline void acerhdf_revert_to_bios_mode(void)
354{
355 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
356 kernelmode = 0;
357 if (thz_dev)
358 thz_dev->polling_delay = 0;
359 pr_notice("kernel mode fan control OFF\n");
360}
361static inline void acerhdf_enable_kernelmode(void)
362{
363 kernelmode = 1;
364
365 thz_dev->polling_delay = interval*1000;
366 thermal_zone_device_update(thz_dev);
367 pr_notice("kernel mode fan control ON\n");
368}
369
370static int acerhdf_get_mode(struct thermal_zone_device *thermal,
371 enum thermal_device_mode *mode)
372{
373 if (verbose)
374 pr_notice("kernel mode fan control %d\n", kernelmode);
375
376 *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
377 : THERMAL_DEVICE_DISABLED;
378
379 return 0;
380}
381
382/*
383 * set operation mode;
384 * enabled: the thermal layer of the kernel takes care about
385 * the temperature and the fan.
386 * disabled: the BIOS takes control of the fan.
387 */
388static int acerhdf_set_mode(struct thermal_zone_device *thermal,
389 enum thermal_device_mode mode)
390{
391 if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
392 acerhdf_revert_to_bios_mode();
393 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
394 acerhdf_enable_kernelmode();
395
396 return 0;
397}
398
399static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
400 enum thermal_trip_type *type)
401{
402 if (trip == 0)
403 *type = THERMAL_TRIP_ACTIVE;
404
405 return 0;
406}
407
408static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
409 unsigned long *temp)
410{
411 if (trip == 0)
412 *temp = fanon;
413
414 return 0;
415}
416
417static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
418 unsigned long *temperature)
419{
420 *temperature = ACERHDF_TEMP_CRIT;
421 return 0;
422}
423
424/* bind callback functions to thermalzone */
425static struct thermal_zone_device_ops acerhdf_dev_ops = {
426 .bind = acerhdf_bind,
427 .unbind = acerhdf_unbind,
428 .get_temp = acerhdf_get_ec_temp,
429 .get_mode = acerhdf_get_mode,
430 .set_mode = acerhdf_set_mode,
431 .get_trip_type = acerhdf_get_trip_type,
432 .get_trip_temp = acerhdf_get_trip_temp,
433 .get_crit_temp = acerhdf_get_crit_temp,
434};
435
436
437/*
438 * cooling device callback functions
439 * get maximal fan cooling state
440 */
441static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
442 unsigned long *state)
443{
444 *state = 1;
445
446 return 0;
447}
448
449static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
450 unsigned long *state)
451{
452 int err = 0, tmp;
453
454 err = acerhdf_get_fanstate(&tmp);
455 if (err)
456 return err;
457
458 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
459 return 0;
460}
461
462/* change current fan state - is overwritten when running in kernel mode */
463static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
464 unsigned long state)
465{
466 int cur_temp, cur_state, err = 0;
467
468 if (!kernelmode)
469 return 0;
470
471 err = acerhdf_get_temp(&cur_temp);
472 if (err) {
473 pr_err("error reading temperature, hand off control to BIOS\n");
474 goto err_out;
475 }
476
477 err = acerhdf_get_fanstate(&cur_state);
478 if (err) {
479 pr_err("error reading fan state, hand off control to BIOS\n");
480 goto err_out;
481 }
482
483 if (state == 0) {
484 /* turn fan off only if below fanoff temperature */
485 if ((cur_state == ACERHDF_FAN_AUTO) &&
486 (cur_temp < fanoff))
487 acerhdf_change_fanstate(ACERHDF_FAN_OFF);
488 } else {
489 if (cur_state == ACERHDF_FAN_OFF)
490 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
491 }
492 return 0;
493
494err_out:
495 acerhdf_revert_to_bios_mode();
496 return -EINVAL;
497}
498
499/* bind fan callbacks to fan device */
500static struct thermal_cooling_device_ops acerhdf_cooling_ops = {
501 .get_max_state = acerhdf_get_max_state,
502 .get_cur_state = acerhdf_get_cur_state,
503 .set_cur_state = acerhdf_set_cur_state,
504};
505
506/* suspend / resume functionality */
507static int acerhdf_suspend(struct device *dev)
508{
509 if (kernelmode)
510 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
511
512 if (verbose)
513 pr_notice("going suspend\n");
514
515 return 0;
516}
517
518static int acerhdf_probe(struct platform_device *device)
519{
520 return 0;
521}
522
523static int acerhdf_remove(struct platform_device *device)
524{
525 return 0;
526}
527
528static const struct dev_pm_ops acerhdf_pm_ops = {
529 .suspend = acerhdf_suspend,
530 .freeze = acerhdf_suspend,
531};
532
533static struct platform_driver acerhdf_driver = {
534 .driver = {
535 .name = "acerhdf",
536 .owner = THIS_MODULE,
537 .pm = &acerhdf_pm_ops,
538 },
539 .probe = acerhdf_probe,
540 .remove = acerhdf_remove,
541};
542
543/* checks if str begins with start */
544static int str_starts_with(const char *str, const char *start)
545{
546 unsigned long str_len = 0, start_len = 0;
547
548 str_len = strlen(str);
549 start_len = strlen(start);
550
551 if (str_len >= start_len &&
552 !strncmp(str, start, start_len))
553 return 1;
554
555 return 0;
556}
557
558/* check hardware */
559static int acerhdf_check_hardware(void)
560{
561 char const *vendor, *version, *product;
562 const struct bios_settings_t *bt = NULL;
563
564 /* get BIOS data */
565 vendor = dmi_get_system_info(DMI_SYS_VENDOR);
566 version = dmi_get_system_info(DMI_BIOS_VERSION);
567 product = dmi_get_system_info(DMI_PRODUCT_NAME);
568
569 if (!vendor || !version || !product) {
570 pr_err("error getting hardware information\n");
571 return -EINVAL;
572 }
573
574 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
575
576 if (force_bios[0]) {
577 version = force_bios;
578 pr_info("forcing BIOS version: %s\n", version);
579 kernelmode = 0;
580 }
581
582 if (force_product[0]) {
583 product = force_product;
584 pr_info("forcing BIOS product: %s\n", product);
585 kernelmode = 0;
586 }
587
588 if (verbose)
589 pr_info("BIOS info: %s %s, product: %s\n",
590 vendor, version, product);
591
592 /* search BIOS version and vendor in BIOS settings table */
593 for (bt = bios_tbl; bt->vendor[0]; bt++) {
594 /*
595 * check if actual hardware BIOS vendor, product and version
596 * IDs start with the strings of BIOS table entry
597 */
598 if (str_starts_with(vendor, bt->vendor) &&
599 str_starts_with(product, bt->product) &&
600 str_starts_with(version, bt->version)) {
601 bios_cfg = bt;
602 break;
603 }
604 }
605
606 if (!bios_cfg) {
607 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
608 vendor, product, version);
609 return -EINVAL;
610 }
611
612 /*
613 * if started with kernel mode off, prevent the kernel from switching
614 * off the fan
615 */
616 if (!kernelmode) {
617 pr_notice("Fan control off, to enable do:\n");
618 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zone0/mode\n");
619 }
620
621 return 0;
622}
623
624static int acerhdf_register_platform(void)
625{
626 int err = 0;
627
628 err = platform_driver_register(&acerhdf_driver);
629 if (err)
630 return err;
631
632 acerhdf_dev = platform_device_alloc("acerhdf", -1);
633 if (!acerhdf_dev) {
634 err = -ENOMEM;
635 goto err_device_alloc;
636 }
637 err = platform_device_add(acerhdf_dev);
638 if (err)
639 goto err_device_add;
640
641 return 0;
642
643err_device_add:
644 platform_device_put(acerhdf_dev);
645err_device_alloc:
646 platform_driver_unregister(&acerhdf_driver);
647 return err;
648}
649
650static void acerhdf_unregister_platform(void)
651{
652 platform_device_unregister(acerhdf_dev);
653 platform_driver_unregister(&acerhdf_driver);
654}
655
656static int acerhdf_register_thermal(void)
657{
658 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
659 &acerhdf_cooling_ops);
660
661 if (IS_ERR(cl_dev))
662 return -EINVAL;
663
664 thz_dev = thermal_zone_device_register("acerhdf", 1, 0, NULL,
665 &acerhdf_dev_ops, NULL, 0,
666 (kernelmode) ? interval*1000 : 0);
667 if (IS_ERR(thz_dev))
668 return -EINVAL;
669
670 return 0;
671}
672
673static void acerhdf_unregister_thermal(void)
674{
675 if (cl_dev) {
676 thermal_cooling_device_unregister(cl_dev);
677 cl_dev = NULL;
678 }
679
680 if (thz_dev) {
681 thermal_zone_device_unregister(thz_dev);
682 thz_dev = NULL;
683 }
684}
685
686static int __init acerhdf_init(void)
687{
688 int err = 0;
689
690 err = acerhdf_check_hardware();
691 if (err)
692 goto out_err;
693
694 err = acerhdf_register_platform();
695 if (err)
696 goto out_err;
697
698 err = acerhdf_register_thermal();
699 if (err)
700 goto err_unreg;
701
702 return 0;
703
704err_unreg:
705 acerhdf_unregister_thermal();
706 acerhdf_unregister_platform();
707
708out_err:
709 return err;
710}
711
712static void __exit acerhdf_exit(void)
713{
714 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
715 acerhdf_unregister_thermal();
716 acerhdf_unregister_platform();
717}
718
719MODULE_LICENSE("GPL");
720MODULE_AUTHOR("Peter Feuerer");
721MODULE_DESCRIPTION("Aspire One temperature and fan driver");
722MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
723MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
724MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
725MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
726MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
727MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
728MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
729MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
730MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
731MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
732MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
733MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
734MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
735MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
736MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
737
738module_init(acerhdf_init);
739module_exit(acerhdf_exit);