Commit | Line | Data |
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e86435eb PF |
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/fs.h> | |
39 | #include <linux/dmi.h> | |
40 | #include <acpi/acpi_drivers.h> | |
41 | #include <linux/sched.h> | |
42 | #include <linux/thermal.h> | |
43 | #include <linux/platform_device.h> | |
44 | ||
45 | /* | |
46 | * The driver is started with "kernel mode off" by default. That means, the BIOS | |
47 | * is still in control of the fan. In this mode the driver allows to read the | |
48 | * temperature of the cpu and a userspace tool may take over control of the fan. | |
49 | * If the driver is switched to "kernel mode" (e.g. via module parameter) the | |
50 | * driver is in full control of the fan. If you want the module to be started in | |
51 | * kernel mode by default, define the following: | |
52 | */ | |
53 | #undef START_IN_KERNEL_MODE | |
54 | ||
70052917 | 55 | #define DRV_VER "0.5.18" |
e86435eb PF |
56 | |
57 | /* | |
58 | * According to the Atom N270 datasheet, | |
59 | * (http://download.intel.com/design/processor/datashts/320032.pdf) the | |
60 | * CPU's optimal operating limits denoted in junction temperature as | |
61 | * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So, | |
62 | * assume 89°C is critical temperature. | |
63 | */ | |
70052917 | 64 | #define ACERHDF_TEMP_CRIT 89000 |
e86435eb PF |
65 | #define ACERHDF_FAN_OFF 0 |
66 | #define ACERHDF_FAN_AUTO 1 | |
67 | ||
68 | /* | |
69 | * No matter what value the user puts into the fanon variable, turn on the fan | |
70 | * at 80 degree Celsius to prevent hardware damage | |
71 | */ | |
70052917 | 72 | #define ACERHDF_MAX_FANON 80000 |
e86435eb PF |
73 | |
74 | /* | |
75 | * Maximum interval between two temperature checks is 15 seconds, as the die | |
76 | * can get hot really fast under heavy load (plus we shouldn't forget about | |
77 | * possible impact of _external_ aggressive sources such as heaters, sun etc.) | |
78 | */ | |
79 | #define ACERHDF_MAX_INTERVAL 15 | |
80 | ||
81 | #ifdef START_IN_KERNEL_MODE | |
82 | static int kernelmode = 1; | |
83 | #else | |
84 | static int kernelmode; | |
85 | #endif | |
86 | ||
87 | static unsigned int interval = 10; | |
70052917 PF |
88 | static unsigned int fanon = 63000; |
89 | static unsigned int fanoff = 58000; | |
e86435eb PF |
90 | static unsigned int verbose; |
91 | static unsigned int fanstate = ACERHDF_FAN_AUTO; | |
92 | static char force_bios[16]; | |
ded0cdfc | 93 | static char force_product[16]; |
e86435eb PF |
94 | static unsigned int prev_interval; |
95 | struct thermal_zone_device *thz_dev; | |
96 | struct thermal_cooling_device *cl_dev; | |
97 | struct platform_device *acerhdf_dev; | |
98 | ||
99 | module_param(kernelmode, uint, 0); | |
100 | MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off"); | |
101 | module_param(interval, uint, 0600); | |
102 | MODULE_PARM_DESC(interval, "Polling interval of temperature check"); | |
103 | module_param(fanon, uint, 0600); | |
104 | MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature"); | |
105 | module_param(fanoff, uint, 0600); | |
106 | MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature"); | |
107 | module_param(verbose, uint, 0600); | |
108 | MODULE_PARM_DESC(verbose, "Enable verbose dmesg output"); | |
109 | module_param_string(force_bios, force_bios, 16, 0); | |
110 | MODULE_PARM_DESC(force_bios, "Force BIOS version and omit BIOS check"); | |
ded0cdfc PF |
111 | module_param_string(force_product, force_product, 16, 0); |
112 | MODULE_PARM_DESC(force_product, "Force BIOS product and omit BIOS check"); | |
113 | ||
114 | /* | |
115 | * cmd_off: to switch the fan completely off / to check if the fan is off | |
116 | * cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then | |
117 | * the fan speed depending on the temperature | |
118 | */ | |
119 | struct fancmd { | |
120 | u8 cmd_off; | |
121 | u8 cmd_auto; | |
122 | }; | |
e86435eb PF |
123 | |
124 | /* BIOS settings */ | |
125 | struct bios_settings_t { | |
126 | const char *vendor; | |
ded0cdfc | 127 | const char *product; |
e86435eb PF |
128 | const char *version; |
129 | unsigned char fanreg; | |
130 | unsigned char tempreg; | |
ded0cdfc | 131 | struct fancmd cmd; |
e86435eb PF |
132 | }; |
133 | ||
134 | /* Register addresses and values for different BIOS versions */ | |
135 | static const struct bios_settings_t bios_tbl[] = { | |
ded0cdfc PF |
136 | /* AOA110 */ |
137 | {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00} }, | |
138 | {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00} }, | |
139 | {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00} }, | |
140 | {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00} }, | |
141 | {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00} }, | |
f9449151 | 142 | {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00} }, |
ded0cdfc PF |
143 | {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00} }, |
144 | {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00} }, | |
145 | {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00} }, | |
146 | /* AOA150 */ | |
147 | {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x20, 0x00} }, | |
f9449151 | 148 | {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00} }, |
ded0cdfc PF |
149 | {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00} }, |
150 | {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00} }, | |
f9449151 | 151 | {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00} }, |
ded0cdfc PF |
152 | {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00} }, |
153 | {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00} }, | |
154 | {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00} }, | |
155 | /* special BIOS / other */ | |
156 | {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00} }, | |
157 | {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00} }, | |
158 | {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00} }, | |
159 | {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00} }, | |
f9449151 | 160 | {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} }, |
ded0cdfc PF |
161 | /* pewpew-terminator */ |
162 | {"", "", "", 0, 0, {0, 0} } | |
e86435eb PF |
163 | }; |
164 | ||
165 | static const struct bios_settings_t *bios_cfg __read_mostly; | |
166 | ||
e86435eb PF |
167 | static int acerhdf_get_temp(int *temp) |
168 | { | |
169 | u8 read_temp; | |
170 | ||
171 | if (ec_read(bios_cfg->tempreg, &read_temp)) | |
172 | return -EINVAL; | |
173 | ||
70052917 | 174 | *temp = read_temp * 1000; |
e86435eb PF |
175 | |
176 | return 0; | |
177 | } | |
178 | ||
179 | static int acerhdf_get_fanstate(int *state) | |
180 | { | |
181 | u8 fan; | |
e86435eb PF |
182 | |
183 | if (ec_read(bios_cfg->fanreg, &fan)) | |
184 | return -EINVAL; | |
185 | ||
ded0cdfc PF |
186 | if (fan != bios_cfg->cmd.cmd_off) |
187 | *state = ACERHDF_FAN_AUTO; | |
188 | else | |
189 | *state = ACERHDF_FAN_OFF; | |
e86435eb PF |
190 | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static void acerhdf_change_fanstate(int state) | |
195 | { | |
196 | unsigned char cmd; | |
197 | ||
198 | if (verbose) | |
199 | pr_notice("fan %s\n", (state == ACERHDF_FAN_OFF) ? | |
200 | "OFF" : "ON"); | |
201 | ||
202 | if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) { | |
203 | pr_err("invalid fan state %d requested, setting to auto!\n", | |
204 | state); | |
205 | state = ACERHDF_FAN_AUTO; | |
206 | } | |
207 | ||
ded0cdfc PF |
208 | cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off |
209 | : bios_cfg->cmd.cmd_auto; | |
e86435eb PF |
210 | fanstate = state; |
211 | ||
212 | ec_write(bios_cfg->fanreg, cmd); | |
213 | } | |
214 | ||
215 | static void acerhdf_check_param(struct thermal_zone_device *thermal) | |
216 | { | |
217 | if (fanon > ACERHDF_MAX_FANON) { | |
218 | pr_err("fanon temperature too high, set to %d\n", | |
219 | ACERHDF_MAX_FANON); | |
220 | fanon = ACERHDF_MAX_FANON; | |
221 | } | |
222 | ||
223 | if (kernelmode && prev_interval != interval) { | |
224 | if (interval > ACERHDF_MAX_INTERVAL) { | |
225 | pr_err("interval too high, set to %d\n", | |
226 | ACERHDF_MAX_INTERVAL); | |
227 | interval = ACERHDF_MAX_INTERVAL; | |
228 | } | |
229 | if (verbose) | |
230 | pr_notice("interval changed to: %d\n", | |
231 | interval); | |
232 | thermal->polling_delay = interval*1000; | |
233 | prev_interval = interval; | |
234 | } | |
235 | } | |
236 | ||
237 | /* | |
238 | * This is the thermal zone callback which does the delayed polling of the fan | |
239 | * state. We do check /sysfs-originating settings here in acerhdf_check_param() | |
240 | * as late as the polling interval is since we can't do that in the respective | |
241 | * accessors of the module parameters. | |
242 | */ | |
243 | static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, | |
244 | unsigned long *t) | |
245 | { | |
246 | int temp, err = 0; | |
247 | ||
248 | acerhdf_check_param(thermal); | |
249 | ||
250 | err = acerhdf_get_temp(&temp); | |
251 | if (err) | |
252 | return err; | |
253 | ||
254 | if (verbose) | |
255 | pr_notice("temp %d\n", temp); | |
256 | ||
257 | *t = temp; | |
258 | return 0; | |
259 | } | |
260 | ||
261 | static int acerhdf_bind(struct thermal_zone_device *thermal, | |
262 | struct thermal_cooling_device *cdev) | |
263 | { | |
264 | /* if the cooling device is the one from acerhdf bind it */ | |
265 | if (cdev != cl_dev) | |
266 | return 0; | |
267 | ||
268 | if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) { | |
269 | pr_err("error binding cooling dev\n"); | |
270 | return -EINVAL; | |
271 | } | |
272 | return 0; | |
273 | } | |
274 | ||
275 | static int acerhdf_unbind(struct thermal_zone_device *thermal, | |
276 | struct thermal_cooling_device *cdev) | |
277 | { | |
278 | if (cdev != cl_dev) | |
279 | return 0; | |
280 | ||
281 | if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) { | |
282 | pr_err("error unbinding cooling dev\n"); | |
283 | return -EINVAL; | |
284 | } | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static inline void acerhdf_revert_to_bios_mode(void) | |
289 | { | |
290 | acerhdf_change_fanstate(ACERHDF_FAN_AUTO); | |
291 | kernelmode = 0; | |
292 | if (thz_dev) | |
293 | thz_dev->polling_delay = 0; | |
294 | pr_notice("kernel mode fan control OFF\n"); | |
295 | } | |
296 | static inline void acerhdf_enable_kernelmode(void) | |
297 | { | |
298 | kernelmode = 1; | |
299 | ||
300 | thz_dev->polling_delay = interval*1000; | |
301 | thermal_zone_device_update(thz_dev); | |
302 | pr_notice("kernel mode fan control ON\n"); | |
303 | } | |
304 | ||
305 | static int acerhdf_get_mode(struct thermal_zone_device *thermal, | |
306 | enum thermal_device_mode *mode) | |
307 | { | |
308 | if (verbose) | |
309 | pr_notice("kernel mode fan control %d\n", kernelmode); | |
310 | ||
311 | *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED | |
312 | : THERMAL_DEVICE_DISABLED; | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | /* | |
318 | * set operation mode; | |
319 | * enabled: the thermal layer of the kernel takes care about | |
320 | * the temperature and the fan. | |
321 | * disabled: the BIOS takes control of the fan. | |
322 | */ | |
323 | static int acerhdf_set_mode(struct thermal_zone_device *thermal, | |
324 | enum thermal_device_mode mode) | |
325 | { | |
326 | if (mode == THERMAL_DEVICE_DISABLED && kernelmode) | |
327 | acerhdf_revert_to_bios_mode(); | |
328 | else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode) | |
329 | acerhdf_enable_kernelmode(); | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip, | |
335 | enum thermal_trip_type *type) | |
336 | { | |
337 | if (trip == 0) | |
338 | *type = THERMAL_TRIP_ACTIVE; | |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
343 | static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip, | |
344 | unsigned long *temp) | |
345 | { | |
346 | if (trip == 0) | |
347 | *temp = fanon; | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
352 | static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal, | |
353 | unsigned long *temperature) | |
354 | { | |
355 | *temperature = ACERHDF_TEMP_CRIT; | |
356 | return 0; | |
357 | } | |
358 | ||
359 | /* bind callback functions to thermalzone */ | |
360 | struct thermal_zone_device_ops acerhdf_dev_ops = { | |
361 | .bind = acerhdf_bind, | |
362 | .unbind = acerhdf_unbind, | |
363 | .get_temp = acerhdf_get_ec_temp, | |
364 | .get_mode = acerhdf_get_mode, | |
365 | .set_mode = acerhdf_set_mode, | |
366 | .get_trip_type = acerhdf_get_trip_type, | |
367 | .get_trip_temp = acerhdf_get_trip_temp, | |
368 | .get_crit_temp = acerhdf_get_crit_temp, | |
369 | }; | |
370 | ||
371 | ||
372 | /* | |
373 | * cooling device callback functions | |
374 | * get maximal fan cooling state | |
375 | */ | |
376 | static int acerhdf_get_max_state(struct thermal_cooling_device *cdev, | |
377 | unsigned long *state) | |
378 | { | |
379 | *state = 1; | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev, | |
385 | unsigned long *state) | |
386 | { | |
387 | int err = 0, tmp; | |
388 | ||
389 | err = acerhdf_get_fanstate(&tmp); | |
390 | if (err) | |
391 | return err; | |
392 | ||
393 | *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0; | |
394 | return 0; | |
395 | } | |
396 | ||
397 | /* change current fan state - is overwritten when running in kernel mode */ | |
398 | static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, | |
399 | unsigned long state) | |
400 | { | |
401 | int cur_temp, cur_state, err = 0; | |
402 | ||
403 | if (!kernelmode) | |
404 | return 0; | |
405 | ||
406 | err = acerhdf_get_temp(&cur_temp); | |
407 | if (err) { | |
408 | pr_err("error reading temperature, hand off control to BIOS\n"); | |
409 | goto err_out; | |
410 | } | |
411 | ||
412 | err = acerhdf_get_fanstate(&cur_state); | |
413 | if (err) { | |
414 | pr_err("error reading fan state, hand off control to BIOS\n"); | |
415 | goto err_out; | |
416 | } | |
417 | ||
418 | if (state == 0) { | |
419 | /* turn fan off only if below fanoff temperature */ | |
420 | if ((cur_state == ACERHDF_FAN_AUTO) && | |
421 | (cur_temp < fanoff)) | |
422 | acerhdf_change_fanstate(ACERHDF_FAN_OFF); | |
423 | } else { | |
424 | if (cur_state == ACERHDF_FAN_OFF) | |
425 | acerhdf_change_fanstate(ACERHDF_FAN_AUTO); | |
426 | } | |
427 | return 0; | |
428 | ||
429 | err_out: | |
430 | acerhdf_revert_to_bios_mode(); | |
431 | return -EINVAL; | |
432 | } | |
433 | ||
434 | /* bind fan callbacks to fan device */ | |
435 | struct thermal_cooling_device_ops acerhdf_cooling_ops = { | |
436 | .get_max_state = acerhdf_get_max_state, | |
437 | .get_cur_state = acerhdf_get_cur_state, | |
438 | .set_cur_state = acerhdf_set_cur_state, | |
439 | }; | |
440 | ||
441 | /* suspend / resume functionality */ | |
ff27e1f3 | 442 | static int acerhdf_suspend(struct device *dev) |
e86435eb PF |
443 | { |
444 | if (kernelmode) | |
445 | acerhdf_change_fanstate(ACERHDF_FAN_AUTO); | |
446 | ||
447 | if (verbose) | |
448 | pr_notice("going suspend\n"); | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
e86435eb PF |
453 | static int __devinit acerhdf_probe(struct platform_device *device) |
454 | { | |
455 | return 0; | |
456 | } | |
457 | ||
458 | static int acerhdf_remove(struct platform_device *device) | |
459 | { | |
460 | return 0; | |
461 | } | |
462 | ||
47145210 | 463 | static const struct dev_pm_ops acerhdf_pm_ops = { |
ff27e1f3 BP |
464 | .suspend = acerhdf_suspend, |
465 | .freeze = acerhdf_suspend, | |
466 | }; | |
467 | ||
ded0cdfc | 468 | static struct platform_driver acerhdf_driver = { |
e86435eb | 469 | .driver = { |
ff27e1f3 | 470 | .name = "acerhdf", |
e86435eb | 471 | .owner = THIS_MODULE, |
ff27e1f3 | 472 | .pm = &acerhdf_pm_ops, |
e86435eb PF |
473 | }, |
474 | .probe = acerhdf_probe, | |
475 | .remove = acerhdf_remove, | |
e86435eb PF |
476 | }; |
477 | ||
478 | ||
479 | /* check hardware */ | |
480 | static int acerhdf_check_hardware(void) | |
481 | { | |
482 | char const *vendor, *version, *product; | |
483 | int i; | |
ded0cdfc | 484 | unsigned long prod_len = 0; |
e86435eb PF |
485 | |
486 | /* get BIOS data */ | |
487 | vendor = dmi_get_system_info(DMI_SYS_VENDOR); | |
488 | version = dmi_get_system_info(DMI_BIOS_VERSION); | |
489 | product = dmi_get_system_info(DMI_PRODUCT_NAME); | |
490 | ||
ded0cdfc | 491 | |
e86435eb PF |
492 | pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER); |
493 | ||
ded0cdfc | 494 | if (force_bios[0]) { |
e86435eb | 495 | version = force_bios; |
ded0cdfc | 496 | pr_info("forcing BIOS version: %s\n", version); |
e86435eb PF |
497 | kernelmode = 0; |
498 | } | |
499 | ||
ded0cdfc PF |
500 | if (force_product[0]) { |
501 | product = force_product; | |
502 | pr_info("forcing BIOS product: %s\n", product); | |
503 | kernelmode = 0; | |
504 | } | |
505 | ||
506 | prod_len = strlen(product); | |
507 | ||
e86435eb PF |
508 | if (verbose) |
509 | pr_info("BIOS info: %s %s, product: %s\n", | |
510 | vendor, version, product); | |
511 | ||
512 | /* search BIOS version and vendor in BIOS settings table */ | |
513 | for (i = 0; bios_tbl[i].version[0]; i++) { | |
ded0cdfc PF |
514 | if (strlen(bios_tbl[i].product) >= prod_len && |
515 | !strncmp(bios_tbl[i].product, product, | |
516 | strlen(bios_tbl[i].product)) && | |
517 | !strcmp(bios_tbl[i].vendor, vendor) && | |
e86435eb PF |
518 | !strcmp(bios_tbl[i].version, version)) { |
519 | bios_cfg = &bios_tbl[i]; | |
520 | break; | |
521 | } | |
522 | } | |
523 | ||
524 | if (!bios_cfg) { | |
ded0cdfc PF |
525 | pr_err("unknown (unsupported) BIOS version %s/%s/%s, " |
526 | "please report, aborting!\n", vendor, product, version); | |
e86435eb PF |
527 | return -EINVAL; |
528 | } | |
529 | ||
530 | /* | |
531 | * if started with kernel mode off, prevent the kernel from switching | |
532 | * off the fan | |
533 | */ | |
534 | if (!kernelmode) { | |
535 | pr_notice("Fan control off, to enable do:\n"); | |
536 | pr_notice("echo -n \"enabled\" > " | |
537 | "/sys/class/thermal/thermal_zone0/mode\n"); | |
538 | } | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | static int acerhdf_register_platform(void) | |
544 | { | |
545 | int err = 0; | |
546 | ||
ded0cdfc | 547 | err = platform_driver_register(&acerhdf_driver); |
e86435eb PF |
548 | if (err) |
549 | return err; | |
550 | ||
551 | acerhdf_dev = platform_device_alloc("acerhdf", -1); | |
552 | platform_device_add(acerhdf_dev); | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
557 | static void acerhdf_unregister_platform(void) | |
558 | { | |
559 | if (!acerhdf_dev) | |
560 | return; | |
561 | ||
562 | platform_device_del(acerhdf_dev); | |
ded0cdfc | 563 | platform_driver_unregister(&acerhdf_driver); |
e86435eb PF |
564 | } |
565 | ||
566 | static int acerhdf_register_thermal(void) | |
567 | { | |
568 | cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL, | |
569 | &acerhdf_cooling_ops); | |
570 | ||
571 | if (IS_ERR(cl_dev)) | |
572 | return -EINVAL; | |
573 | ||
574 | thz_dev = thermal_zone_device_register("acerhdf", 1, NULL, | |
575 | &acerhdf_dev_ops, 0, 0, 0, | |
576 | (kernelmode) ? interval*1000 : 0); | |
577 | if (IS_ERR(thz_dev)) | |
578 | return -EINVAL; | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
583 | static void acerhdf_unregister_thermal(void) | |
584 | { | |
585 | if (cl_dev) { | |
586 | thermal_cooling_device_unregister(cl_dev); | |
587 | cl_dev = NULL; | |
588 | } | |
589 | ||
590 | if (thz_dev) { | |
591 | thermal_zone_device_unregister(thz_dev); | |
592 | thz_dev = NULL; | |
593 | } | |
594 | } | |
595 | ||
596 | static int __init acerhdf_init(void) | |
597 | { | |
598 | int err = 0; | |
599 | ||
600 | err = acerhdf_check_hardware(); | |
601 | if (err) | |
602 | goto out_err; | |
603 | ||
604 | err = acerhdf_register_platform(); | |
605 | if (err) | |
606 | goto err_unreg; | |
607 | ||
608 | err = acerhdf_register_thermal(); | |
609 | if (err) | |
610 | goto err_unreg; | |
611 | ||
612 | return 0; | |
613 | ||
614 | err_unreg: | |
615 | acerhdf_unregister_thermal(); | |
616 | acerhdf_unregister_platform(); | |
617 | ||
618 | out_err: | |
619 | return -ENODEV; | |
620 | } | |
621 | ||
622 | static void __exit acerhdf_exit(void) | |
623 | { | |
624 | acerhdf_change_fanstate(ACERHDF_FAN_AUTO); | |
625 | acerhdf_unregister_thermal(); | |
626 | acerhdf_unregister_platform(); | |
627 | } | |
628 | ||
629 | MODULE_LICENSE("GPL"); | |
630 | MODULE_AUTHOR("Peter Feuerer"); | |
631 | MODULE_DESCRIPTION("Aspire One temperature and fan driver"); | |
632 | MODULE_ALIAS("dmi:*:*Acer*:*:"); | |
633 | MODULE_ALIAS("dmi:*:*Gateway*:*:"); | |
634 | MODULE_ALIAS("dmi:*:*Packard Bell*:*:"); | |
635 | ||
636 | module_init(acerhdf_init); | |
637 | module_exit(acerhdf_exit); |