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/drivers/platform/x86/acerhdf.c

https://bitbucket.org/slukk/jb-tsm-kernel-4.2
C | 717 lines | 504 code | 108 blank | 105 comment | 73 complexity | 1826486364ae0d839fba80368c8b216b MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/*
  2 * acerhdf - A driver which monitors the temperature
  3 *           of the aspire one netbook, turns on/off the fan
  4 *           as soon as the upper/lower threshold is reached.
  5 *
  6 * (C) 2009 - Peter Feuerer     peter (a) piie.net
  7 *                              http://piie.net
  8 *     2009 Borislav Petkov <petkovbb@gmail.com>
  9 *
 10 * Inspired by and many thanks to:
 11 *  o acerfand   - Rachel Greenham
 12 *  o acer_ec.pl - Michael Kurz     michi.kurz (at) googlemail.com
 13 *               - Petr Tomasek     tomasek (#) etf,cuni,cz
 14 *               - Carlos Corbacho  cathectic (at) gmail.com
 15 *  o lkml       - Matthew Garrett
 16 *               - Borislav Petkov
 17 *               - Andreas Mohr
 18 *
 19 *  This program is free software; you can redistribute it and/or modify
 20 *  it under the terms of the GNU General Public License as published by
 21 *  the Free Software Foundation; either version 2 of the License, or
 22 *  (at your option) any later version.
 23 *
 24 *  This program is distributed in the hope that it will be useful,
 25 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 26 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 27 *  GNU General Public License for more details.
 28 *
 29 *  You should have received a copy of the GNU General Public License
 30 *  along with this program; if not, write to the Free Software
 31 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 32 */
 33
 34#define pr_fmt(fmt) "acerhdf: " fmt
 35
 36#include <linux/kernel.h>
 37#include <linux/module.h>
 38#include <linux/dmi.h>
 39#include <linux/acpi.h>
 40#include <linux/thermal.h>
 41#include <linux/platform_device.h>
 42
 43/*
 44 * The driver is started with "kernel mode off" by default. That means, the BIOS
 45 * is still in control of the fan. In this mode the driver allows to read the
 46 * temperature of the cpu and a userspace tool may take over control of the fan.
 47 * If the driver is switched to "kernel mode" (e.g. via module parameter) the
 48 * driver is in full control of the fan. If you want the module to be started in
 49 * kernel mode by default, define the following:
 50 */
 51#undef START_IN_KERNEL_MODE
 52
 53#define DRV_VER "0.5.24"
 54
 55/*
 56 * According to the Atom N270 datasheet,
 57 * (http://download.intel.com/design/processor/datashts/320032.pdf) the
 58 * CPU's optimal operating limits denoted in junction temperature as
 59 * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So,
 60 * assume 89°C is critical temperature.
 61 */
 62#define ACERHDF_TEMP_CRIT 89000
 63#define ACERHDF_FAN_OFF 0
 64#define ACERHDF_FAN_AUTO 1
 65
 66/*
 67 * No matter what value the user puts into the fanon variable, turn on the fan
 68 * at 80 degree Celsius to prevent hardware damage
 69 */
 70#define ACERHDF_MAX_FANON 80000
 71
 72/*
 73 * Maximum interval between two temperature checks is 15 seconds, as the die
 74 * can get hot really fast under heavy load (plus we shouldn't forget about
 75 * possible impact of _external_ aggressive sources such as heaters, sun etc.)
 76 */
 77#define ACERHDF_MAX_INTERVAL 15
 78
 79#ifdef START_IN_KERNEL_MODE
 80static int kernelmode = 1;
 81#else
 82static int kernelmode;
 83#endif
 84
 85static unsigned int interval = 10;
 86static unsigned int fanon = 63000;
 87static unsigned int fanoff = 58000;
 88static unsigned int verbose;
 89static unsigned int fanstate = ACERHDF_FAN_AUTO;
 90static char force_bios[16];
 91static char force_product[16];
 92static unsigned int prev_interval;
 93static struct thermal_zone_device *thz_dev;
 94static struct thermal_cooling_device *cl_dev;
 95static struct platform_device *acerhdf_dev;
 96
 97module_param(kernelmode, uint, 0);
 98MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
 99module_param(interval, uint, 0600);
100MODULE_PARM_DESC(interval, "Polling interval of temperature check");
101module_param(fanon, uint, 0600);
102MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
103module_param(fanoff, uint, 0600);
104MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
105module_param(verbose, uint, 0600);
106MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
107module_param_string(force_bios, force_bios, 16, 0);
108MODULE_PARM_DESC(force_bios, "Force BIOS version and omit BIOS check");
109module_param_string(force_product, force_product, 16, 0);
110MODULE_PARM_DESC(force_product, "Force BIOS product and omit BIOS check");
111
112/*
113 * cmd_off: to switch the fan completely off and check if the fan is off
114 *	cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
115 *		the fan speed depending on the temperature
116 */
117struct fancmd {
118	u8 cmd_off;
119	u8 cmd_auto;
120};
121
122/* BIOS settings */
123struct bios_settings_t {
124	const char *vendor;
125	const char *product;
126	const char *version;
127	unsigned char fanreg;
128	unsigned char tempreg;
129	struct fancmd cmd;
130};
131
132/* Register addresses and values for different BIOS versions */
133static const struct bios_settings_t bios_tbl[] = {
134	/* AOA110 */
135	{"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00} },
136	{"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00} },
137	{"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00} },
138	{"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00} },
139	{"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00} },
140	{"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00} },
141	{"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00} },
142	{"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00} },
143	{"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00} },
144	/* AOA150 */
145	{"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00} },
146	{"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00} },
147	{"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00} },
148	{"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00} },
149	{"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00} },
150	{"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00} },
151	{"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00} },
152	{"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00} },
153	/* Acer 1410 */
154	{"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
155	{"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
156	{"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
157	{"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
158	{"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
159	{"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
160	{"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
161	{"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
162	{"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
163	{"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
164	/* Acer 1810xx */
165	{"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
166	{"Acer", "Aspire 1810T",  "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
167	{"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
168	{"Acer", "Aspire 1810T",  "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
169	{"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
170	{"Acer", "Aspire 1810T",  "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
171	{"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
172	{"Acer", "Aspire 1810T",  "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
173	{"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
174	{"Acer", "Aspire 1810T",  "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
175	{"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
176	{"Acer", "Aspire 1810T",  "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
177	{"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
178	{"Acer", "Aspire 1810T",  "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
179	{"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
180	{"Acer", "Aspire 1810T",  "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
181	{"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
182	{"Acer", "Aspire 1810T",  "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
183	{"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
184	{"Acer", "Aspire 1810T",  "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
185	/* Acer 531 */
186	{"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00} },
187	/* Gateway */
188	{"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00} },
189	{"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00} },
190	{"Gateway", "LT31",   "v1.3103", 0x55, 0x58, {0x9e, 0x00} },
191	{"Gateway", "LT31",   "v1.3201", 0x55, 0x58, {0x9e, 0x00} },
192	{"Gateway", "LT31",   "v1.3302", 0x55, 0x58, {0x9e, 0x00} },
193	/* Packard Bell */
194	{"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00} },
195	{"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} },
196	{"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00} },
197	{"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} },
198	{"Packard Bell", "DOTMU",  "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
199	{"Packard Bell", "DOTMU",  "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
200	{"Packard Bell", "DOTMU",  "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
201	{"Packard Bell", "DOTMU",  "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
202	{"Packard Bell", "DOTMU",  "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
203	{"Packard Bell", "DOTMU",  "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
204	{"Packard Bell", "DOTMU",  "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
205	{"Packard Bell", "DOTMU",  "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
206	{"Packard Bell", "DOTMA",  "v1.3201", 0x55, 0x58, {0x9e, 0x00} },
207	{"Packard Bell", "DOTMA",  "v1.3302", 0x55, 0x58, {0x9e, 0x00} },
208	/* pewpew-terminator */
209	{"", "", "", 0, 0, {0, 0} }
210};
211
212static const struct bios_settings_t *bios_cfg __read_mostly;
213
214static int acerhdf_get_temp(int *temp)
215{
216	u8 read_temp;
217
218	if (ec_read(bios_cfg->tempreg, &read_temp))
219		return -EINVAL;
220
221	*temp = read_temp * 1000;
222
223	return 0;
224}
225
226static int acerhdf_get_fanstate(int *state)
227{
228	u8 fan;
229
230	if (ec_read(bios_cfg->fanreg, &fan))
231		return -EINVAL;
232
233	if (fan != bios_cfg->cmd.cmd_off)
234		*state = ACERHDF_FAN_AUTO;
235	else
236		*state = ACERHDF_FAN_OFF;
237
238	return 0;
239}
240
241static void acerhdf_change_fanstate(int state)
242{
243	unsigned char cmd;
244
245	if (verbose)
246		pr_notice("fan %s\n", (state == ACERHDF_FAN_OFF) ?
247				"OFF" : "ON");
248
249	if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
250		pr_err("invalid fan state %d requested, setting to auto!\n",
251			state);
252		state = ACERHDF_FAN_AUTO;
253	}
254
255	cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
256					 : bios_cfg->cmd.cmd_auto;
257	fanstate = state;
258
259	ec_write(bios_cfg->fanreg, cmd);
260}
261
262static void acerhdf_check_param(struct thermal_zone_device *thermal)
263{
264	if (fanon > ACERHDF_MAX_FANON) {
265		pr_err("fanon temperature too high, set to %d\n",
266				ACERHDF_MAX_FANON);
267		fanon = ACERHDF_MAX_FANON;
268	}
269
270	if (kernelmode && prev_interval != interval) {
271		if (interval > ACERHDF_MAX_INTERVAL) {
272			pr_err("interval too high, set to %d\n",
273				ACERHDF_MAX_INTERVAL);
274			interval = ACERHDF_MAX_INTERVAL;
275		}
276		if (verbose)
277			pr_notice("interval changed to: %d\n",
278					interval);
279		thermal->polling_delay = interval*1000;
280		prev_interval = interval;
281	}
282}
283
284/*
285 * This is the thermal zone callback which does the delayed polling of the fan
286 * state. We do check /sysfs-originating settings here in acerhdf_check_param()
287 * as late as the polling interval is since we can't do that in the respective
288 * accessors of the module parameters.
289 */
290static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
291			       unsigned long *t)
292{
293	int temp, err = 0;
294
295	acerhdf_check_param(thermal);
296
297	err = acerhdf_get_temp(&temp);
298	if (err)
299		return err;
300
301	if (verbose)
302		pr_notice("temp %d\n", temp);
303
304	*t = temp;
305	return 0;
306}
307
308static int acerhdf_bind(struct thermal_zone_device *thermal,
309			struct thermal_cooling_device *cdev)
310{
311	/* if the cooling device is the one from acerhdf bind it */
312	if (cdev != cl_dev)
313		return 0;
314
315	if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
316		pr_err("error binding cooling dev\n");
317		return -EINVAL;
318	}
319	return 0;
320}
321
322static int acerhdf_unbind(struct thermal_zone_device *thermal,
323			  struct thermal_cooling_device *cdev)
324{
325	if (cdev != cl_dev)
326		return 0;
327
328	if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
329		pr_err("error unbinding cooling dev\n");
330		return -EINVAL;
331	}
332	return 0;
333}
334
335static inline void acerhdf_revert_to_bios_mode(void)
336{
337	acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
338	kernelmode = 0;
339	if (thz_dev)
340		thz_dev->polling_delay = 0;
341	pr_notice("kernel mode fan control OFF\n");
342}
343static inline void acerhdf_enable_kernelmode(void)
344{
345	kernelmode = 1;
346
347	thz_dev->polling_delay = interval*1000;
348	thermal_zone_device_update(thz_dev);
349	pr_notice("kernel mode fan control ON\n");
350}
351
352static int acerhdf_get_mode(struct thermal_zone_device *thermal,
353			    enum thermal_device_mode *mode)
354{
355	if (verbose)
356		pr_notice("kernel mode fan control %d\n", kernelmode);
357
358	*mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
359			     : THERMAL_DEVICE_DISABLED;
360
361	return 0;
362}
363
364/*
365 * set operation mode;
366 * enabled: the thermal layer of the kernel takes care about
367 *          the temperature and the fan.
368 * disabled: the BIOS takes control of the fan.
369 */
370static int acerhdf_set_mode(struct thermal_zone_device *thermal,
371			    enum thermal_device_mode mode)
372{
373	if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
374		acerhdf_revert_to_bios_mode();
375	else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
376		acerhdf_enable_kernelmode();
377
378	return 0;
379}
380
381static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
382				 enum thermal_trip_type *type)
383{
384	if (trip == 0)
385		*type = THERMAL_TRIP_ACTIVE;
386
387	return 0;
388}
389
390static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
391				 unsigned long *temp)
392{
393	if (trip == 0)
394		*temp = fanon;
395
396	return 0;
397}
398
399static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
400				 unsigned long *temperature)
401{
402	*temperature = ACERHDF_TEMP_CRIT;
403	return 0;
404}
405
406/* bind callback functions to thermalzone */
407static struct thermal_zone_device_ops acerhdf_dev_ops = {
408	.bind = acerhdf_bind,
409	.unbind = acerhdf_unbind,
410	.get_temp = acerhdf_get_ec_temp,
411	.get_mode = acerhdf_get_mode,
412	.set_mode = acerhdf_set_mode,
413	.get_trip_type = acerhdf_get_trip_type,
414	.get_trip_temp = acerhdf_get_trip_temp,
415	.get_crit_temp = acerhdf_get_crit_temp,
416};
417
418
419/*
420 * cooling device callback functions
421 * get maximal fan cooling state
422 */
423static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
424				 unsigned long *state)
425{
426	*state = 1;
427
428	return 0;
429}
430
431static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
432				 unsigned long *state)
433{
434	int err = 0, tmp;
435
436	err = acerhdf_get_fanstate(&tmp);
437	if (err)
438		return err;
439
440	*state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
441	return 0;
442}
443
444/* change current fan state - is overwritten when running in kernel mode */
445static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
446				 unsigned long state)
447{
448	int cur_temp, cur_state, err = 0;
449
450	if (!kernelmode)
451		return 0;
452
453	err = acerhdf_get_temp(&cur_temp);
454	if (err) {
455		pr_err("error reading temperature, hand off control to BIOS\n");
456		goto err_out;
457	}
458
459	err = acerhdf_get_fanstate(&cur_state);
460	if (err) {
461		pr_err("error reading fan state, hand off control to BIOS\n");
462		goto err_out;
463	}
464
465	if (state == 0) {
466		/* turn fan off only if below fanoff temperature */
467		if ((cur_state == ACERHDF_FAN_AUTO) &&
468		    (cur_temp < fanoff))
469			acerhdf_change_fanstate(ACERHDF_FAN_OFF);
470	} else {
471		if (cur_state == ACERHDF_FAN_OFF)
472			acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
473	}
474	return 0;
475
476err_out:
477	acerhdf_revert_to_bios_mode();
478	return -EINVAL;
479}
480
481/* bind fan callbacks to fan device */
482static struct thermal_cooling_device_ops acerhdf_cooling_ops = {
483	.get_max_state = acerhdf_get_max_state,
484	.get_cur_state = acerhdf_get_cur_state,
485	.set_cur_state = acerhdf_set_cur_state,
486};
487
488/* suspend / resume functionality */
489static int acerhdf_suspend(struct device *dev)
490{
491	if (kernelmode)
492		acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
493
494	if (verbose)
495		pr_notice("going suspend\n");
496
497	return 0;
498}
499
500static int __devinit acerhdf_probe(struct platform_device *device)
501{
502	return 0;
503}
504
505static int acerhdf_remove(struct platform_device *device)
506{
507	return 0;
508}
509
510static const struct dev_pm_ops acerhdf_pm_ops = {
511	.suspend = acerhdf_suspend,
512	.freeze  = acerhdf_suspend,
513};
514
515static struct platform_driver acerhdf_driver = {
516	.driver = {
517		.name  = "acerhdf",
518		.owner = THIS_MODULE,
519		.pm    = &acerhdf_pm_ops,
520	},
521	.probe = acerhdf_probe,
522	.remove = acerhdf_remove,
523};
524
525/* checks if str begins with start */
526static int str_starts_with(const char *str, const char *start)
527{
528	unsigned long str_len = 0, start_len = 0;
529
530	str_len = strlen(str);
531	start_len = strlen(start);
532
533	if (str_len >= start_len &&
534			!strncmp(str, start, start_len))
535		return 1;
536
537	return 0;
538}
539
540/* check hardware */
541static int acerhdf_check_hardware(void)
542{
543	char const *vendor, *version, *product;
544	const struct bios_settings_t *bt = NULL;
545
546	/* get BIOS data */
547	vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
548	version = dmi_get_system_info(DMI_BIOS_VERSION);
549	product = dmi_get_system_info(DMI_PRODUCT_NAME);
550
551	if (!vendor || !version || !product) {
552		pr_err("error getting hardware information\n");
553		return -EINVAL;
554	}
555
556	pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
557
558	if (force_bios[0]) {
559		version = force_bios;
560		pr_info("forcing BIOS version: %s\n", version);
561		kernelmode = 0;
562	}
563
564	if (force_product[0]) {
565		product = force_product;
566		pr_info("forcing BIOS product: %s\n", product);
567		kernelmode = 0;
568	}
569
570	if (verbose)
571		pr_info("BIOS info: %s %s, product: %s\n",
572			vendor, version, product);
573
574	/* search BIOS version and vendor in BIOS settings table */
575	for (bt = bios_tbl; bt->vendor[0]; bt++) {
576		/*
577		 * check if actual hardware BIOS vendor, product and version
578		 * IDs start with the strings of BIOS table entry
579		 */
580		if (str_starts_with(vendor, bt->vendor) &&
581				str_starts_with(product, bt->product) &&
582				str_starts_with(version, bt->version)) {
583			bios_cfg = bt;
584			break;
585		}
586	}
587
588	if (!bios_cfg) {
589		pr_err("unknown (unsupported) BIOS version %s/%s/%s, "
590			"please report, aborting!\n", vendor, product, version);
591		return -EINVAL;
592	}
593
594	/*
595	 * if started with kernel mode off, prevent the kernel from switching
596	 * off the fan
597	 */
598	if (!kernelmode) {
599		pr_notice("Fan control off, to enable do:\n");
600		pr_notice("echo -n \"enabled\" > "
601			"/sys/class/thermal/thermal_zone0/mode\n");
602	}
603
604	return 0;
605}
606
607static int acerhdf_register_platform(void)
608{
609	int err = 0;
610
611	err = platform_driver_register(&acerhdf_driver);
612	if (err)
613		return err;
614
615	acerhdf_dev = platform_device_alloc("acerhdf", -1);
616	if (!acerhdf_dev) {
617		err = -ENOMEM;
618		goto err_device_alloc;
619	}
620	err = platform_device_add(acerhdf_dev);
621	if (err)
622		goto err_device_add;
623
624	return 0;
625
626err_device_add:
627	platform_device_put(acerhdf_dev);
628err_device_alloc:
629	platform_driver_unregister(&acerhdf_driver);
630	return err;
631}
632
633static void acerhdf_unregister_platform(void)
634{
635	platform_device_unregister(acerhdf_dev);
636	platform_driver_unregister(&acerhdf_driver);
637}
638
639static int acerhdf_register_thermal(void)
640{
641	cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
642						 &acerhdf_cooling_ops);
643
644	if (IS_ERR(cl_dev))
645		return -EINVAL;
646
647	thz_dev = thermal_zone_device_register("acerhdf", 1, NULL,
648					      &acerhdf_dev_ops, 0, 0, 0,
649					      (kernelmode) ? interval*1000 : 0);
650	if (IS_ERR(thz_dev))
651		return -EINVAL;
652
653	return 0;
654}
655
656static void acerhdf_unregister_thermal(void)
657{
658	if (cl_dev) {
659		thermal_cooling_device_unregister(cl_dev);
660		cl_dev = NULL;
661	}
662
663	if (thz_dev) {
664		thermal_zone_device_unregister(thz_dev);
665		thz_dev = NULL;
666	}
667}
668
669static int __init acerhdf_init(void)
670{
671	int err = 0;
672
673	err = acerhdf_check_hardware();
674	if (err)
675		goto out_err;
676
677	err = acerhdf_register_platform();
678	if (err)
679		goto out_err;
680
681	err = acerhdf_register_thermal();
682	if (err)
683		goto err_unreg;
684
685	return 0;
686
687err_unreg:
688	acerhdf_unregister_thermal();
689	acerhdf_unregister_platform();
690
691out_err:
692	return err;
693}
694
695static void __exit acerhdf_exit(void)
696{
697	acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
698	acerhdf_unregister_thermal();
699	acerhdf_unregister_platform();
700}
701
702MODULE_LICENSE("GPL");
703MODULE_AUTHOR("Peter Feuerer");
704MODULE_DESCRIPTION("Aspire One temperature and fan driver");
705MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
706MODULE_ALIAS("dmi:*:*Acer*:pnAspire 1410*:");
707MODULE_ALIAS("dmi:*:*Acer*:pnAspire 1810*:");
708MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
709MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
710MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
711MODULE_ALIAS("dmi:*:*Packard Bell*:pnAOA*:");
712MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOA*:");
713MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOTMU*:");
714MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOTMA*:");
715
716module_init(acerhdf_init);
717module_exit(acerhdf_exit);