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Peter Feuerere86435e2009-06-21 18:53:03 +02001/*
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>
Peter Feuerere86435e2009-06-21 18:53:03 +020038#include <linux/dmi.h>
Jean Delvarec4bae982011-04-24 18:07:55 +020039#include <linux/acpi.h>
Peter Feuerere86435e2009-06-21 18:53:03 +020040#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
Peter Feuerer24964632010-07-20 15:19:33 -070053#define DRV_VER "0.5.24"
Peter Feuerere86435e2009-06-21 18:53:03 +020054
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 */
Peter Feuerer70052912009-11-17 14:07:21 -080062#define ACERHDF_TEMP_CRIT 89000
Peter Feuerere86435e2009-06-21 18:53:03 +020063#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 */
Peter Feuerer70052912009-11-17 14:07:21 -080070#define ACERHDF_MAX_FANON 80000
Peter Feuerere86435e2009-06-21 18:53:03 +020071
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;
Peter Feuerer70052912009-11-17 14:07:21 -080086static unsigned int fanon = 63000;
87static unsigned int fanoff = 58000;
Peter Feuerere86435e2009-06-21 18:53:03 +020088static unsigned int verbose;
89static unsigned int fanstate = ACERHDF_FAN_AUTO;
90static char force_bios[16];
Peter Feuererded0cdf2009-08-06 15:57:52 -070091static char force_product[16];
Peter Feuerere86435e2009-06-21 18:53:03 +020092static unsigned int prev_interval;
Axel Linfedae5a2010-07-20 15:19:43 -070093static struct thermal_zone_device *thz_dev;
94static struct thermal_cooling_device *cl_dev;
95static struct platform_device *acerhdf_dev;
Peter Feuerere86435e2009-06-21 18:53:03 +020096
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");
Peter Feuererded0cdf2009-08-06 15:57:52 -0700109module_param_string(force_product, force_product, 16, 0);
110MODULE_PARM_DESC(force_product, "Force BIOS product and omit BIOS check");
111
112/*
Peter Feuerer210183d2010-07-20 15:19:32 -0700113 * cmd_off: to switch the fan completely off and check if the fan is off
Peter Feuererded0cdf2009-08-06 15:57:52 -0700114 * 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};
Peter Feuerere86435e2009-06-21 18:53:03 +0200121
122/* BIOS settings */
123struct bios_settings_t {
124 const char *vendor;
Peter Feuererded0cdf2009-08-06 15:57:52 -0700125 const char *product;
Peter Feuerere86435e2009-06-21 18:53:03 +0200126 const char *version;
127 unsigned char fanreg;
128 unsigned char tempreg;
Peter Feuererded0cdf2009-08-06 15:57:52 -0700129 struct fancmd cmd;
Peter Feuerere86435e2009-06-21 18:53:03 +0200130};
131
132/* Register addresses and values for different BIOS versions */
133static const struct bios_settings_t bios_tbl[] = {
Peter Feuererded0cdf2009-08-06 15:57:52 -0700134 /* AOA110 */
Peter Feuerer210183d2010-07-20 15:19:32 -0700135 {"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} },
Peter Feuererded0cdf2009-08-06 15:57:52 -0700144 /* AOA150 */
Peter Feuerer210183d2010-07-20 15:19:32 -0700145 {"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} },
Peter Feuerer36065742009-11-17 14:27:37 -0800153 /* Acer 1410 */
Peter Feuerer24964632010-07-20 15:19:33 -0700154 {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
155 {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
Peter Feuerer210183d2010-07-20 15:19:32 -0700156 {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
Peter Feuerer24964632010-07-20 15:19:33 -0700157 {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
158 {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
Peter Feuerer210183d2010-07-20 15:19:32 -0700159 {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
Peter Feuerer24964632010-07-20 15:19:33 -0700160 {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
Peter Feuerer210183d2010-07-20 15:19:32 -0700161 {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
Peter Feuerer24964632010-07-20 15:19:33 -0700162 {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
163 {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
Peter Feuerer94219d72009-12-21 16:20:05 -0800164 /* Acer 1810xx */
Peter Feuerer24964632010-07-20 15:19:33 -0700165 {"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} },
Peter Feuerer210183d2010-07-20 15:19:32 -0700169 {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
170 {"Acer", "Aspire 1810T", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
Peter Feuerer24964632010-07-20 15:19:33 -0700171 {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
172 {"Acer", "Aspire 1810T", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
Peter Feuerer210183d2010-07-20 15:19:32 -0700173 {"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} },
Peter Feuerer24964632010-07-20 15:19:33 -0700181 {"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} },
Julien Valroffb06862b2011-06-24 08:47:17 -0400185 {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00} },
Peter Feuerer24964632010-07-20 15:19:33 -0700186 /* Acer 531 */
187 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00} },
Peter Feuerer94219d72009-12-21 16:20:05 -0800188 /* Gateway */
Peter Feuerer210183d2010-07-20 15:19:32 -0700189 {"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} },
Peter Feuerer94219d72009-12-21 16:20:05 -0800194 /* Packard Bell */
Peter Feuerer210183d2010-07-20 15:19:32 -0700195 {"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} },
Peter Feuerer24964632010-07-20 15:19:33 -0700201 {"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} },
Peter Feuerer210183d2010-07-20 15:19:32 -0700207 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00} },
Peter Feuerer24964632010-07-20 15:19:33 -0700208 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00} },
Peter Feuererded0cdf2009-08-06 15:57:52 -0700209 /* pewpew-terminator */
Peter Feuerer210183d2010-07-20 15:19:32 -0700210 {"", "", "", 0, 0, {0, 0} }
Peter Feuerere86435e2009-06-21 18:53:03 +0200211};
212
213static const struct bios_settings_t *bios_cfg __read_mostly;
214
Peter Feuerere86435e2009-06-21 18:53:03 +0200215static 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
Peter Feuerer70052912009-11-17 14:07:21 -0800222 *temp = read_temp * 1000;
Peter Feuerere86435e2009-06-21 18:53:03 +0200223
224 return 0;
225}
226
227static int acerhdf_get_fanstate(int *state)
228{
229 u8 fan;
Peter Feuerere86435e2009-06-21 18:53:03 +0200230
231 if (ec_read(bios_cfg->fanreg, &fan))
232 return -EINVAL;
233
Peter Feuerer210183d2010-07-20 15:19:32 -0700234 if (fan != bios_cfg->cmd.cmd_off)
Peter Feuererded0cdf2009-08-06 15:57:52 -0700235 *state = ACERHDF_FAN_AUTO;
236 else
237 *state = ACERHDF_FAN_OFF;
Peter Feuerere86435e2009-06-21 18:53:03 +0200238
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
Peter Feuererded0cdf2009-08-06 15:57:52 -0700256 cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
257 : bios_cfg->cmd.cmd_auto;
Peter Feuerere86435e2009-06-21 18:53:03 +0200258 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 */
Axel Linfedae5a2010-07-20 15:19:43 -0700408static struct thermal_zone_device_ops acerhdf_dev_ops = {
Peter Feuerere86435e2009-06-21 18:53:03 +0200409 .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 */
Axel Linfedae5a2010-07-20 15:19:43 -0700483static struct thermal_cooling_device_ops acerhdf_cooling_ops = {
Peter Feuerere86435e2009-06-21 18:53:03 +0200484 .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 */
Borislav Petkovff27e1f2009-09-18 12:41:05 -0700490static int acerhdf_suspend(struct device *dev)
Peter Feuerere86435e2009-06-21 18:53:03 +0200491{
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
Peter Feuerere86435e2009-06-21 18:53:03 +0200501static 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
Alexey Dobriyan47145212009-12-14 18:00:08 -0800511static const struct dev_pm_ops acerhdf_pm_ops = {
Borislav Petkovff27e1f2009-09-18 12:41:05 -0700512 .suspend = acerhdf_suspend,
513 .freeze = acerhdf_suspend,
514};
515
Peter Feuererded0cdf2009-08-06 15:57:52 -0700516static struct platform_driver acerhdf_driver = {
Peter Feuerere86435e2009-06-21 18:53:03 +0200517 .driver = {
Borislav Petkovff27e1f2009-09-18 12:41:05 -0700518 .name = "acerhdf",
Peter Feuerere86435e2009-06-21 18:53:03 +0200519 .owner = THIS_MODULE,
Borislav Petkovff27e1f2009-09-18 12:41:05 -0700520 .pm = &acerhdf_pm_ops,
Peter Feuerere86435e2009-06-21 18:53:03 +0200521 },
522 .probe = acerhdf_probe,
523 .remove = acerhdf_remove,
Peter Feuerere86435e2009-06-21 18:53:03 +0200524};
525
Peter Feuererdcbfb812009-12-21 16:20:06 -0800526/* 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}
Peter Feuerere86435e2009-06-21 18:53:03 +0200540
541/* check hardware */
542static int acerhdf_check_hardware(void)
543{
544 char const *vendor, *version, *product;
Peter Feuererdcbfb812009-12-21 16:20:06 -0800545 const struct bios_settings_t *bt = NULL;
Peter Feuerere86435e2009-06-21 18:53:03 +0200546
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
Rahul Chaturvedi5cf4c072010-07-20 15:19:33 -0700552 if (!vendor || !version || !product) {
553 pr_err("error getting hardware information\n");
554 return -EINVAL;
555 }
Peter Feuererded0cdf2009-08-06 15:57:52 -0700556
Peter Feuerere86435e2009-06-21 18:53:03 +0200557 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
558
Peter Feuererded0cdf2009-08-06 15:57:52 -0700559 if (force_bios[0]) {
Peter Feuerere86435e2009-06-21 18:53:03 +0200560 version = force_bios;
Peter Feuererded0cdf2009-08-06 15:57:52 -0700561 pr_info("forcing BIOS version: %s\n", version);
Peter Feuerere86435e2009-06-21 18:53:03 +0200562 kernelmode = 0;
563 }
564
Peter Feuererded0cdf2009-08-06 15:57:52 -0700565 if (force_product[0]) {
566 product = force_product;
567 pr_info("forcing BIOS product: %s\n", product);
568 kernelmode = 0;
569 }
570
Peter Feuerere86435e2009-06-21 18:53:03 +0200571 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 */
Peter Feuererdcbfb812009-12-21 16:20:06 -0800576 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;
Peter Feuerere86435e2009-06-21 18:53:03 +0200585 break;
586 }
587 }
588
589 if (!bios_cfg) {
Peter Feuererded0cdf2009-08-06 15:57:52 -0700590 pr_err("unknown (unsupported) BIOS version %s/%s/%s, "
591 "please report, aborting!\n", vendor, product, version);
Peter Feuerere86435e2009-06-21 18:53:03 +0200592 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
Peter Feuererded0cdf2009-08-06 15:57:52 -0700612 err = platform_driver_register(&acerhdf_driver);
Peter Feuerere86435e2009-06-21 18:53:03 +0200613 if (err)
614 return err;
615
616 acerhdf_dev = platform_device_alloc("acerhdf", -1);
Axel Lina0dba692010-07-20 15:19:49 -0700617 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;
Peter Feuerere86435e2009-06-21 18:53:03 +0200624
625 return 0;
Axel Lina0dba692010-07-20 15:19:49 -0700626
627err_device_add:
628 platform_device_put(acerhdf_dev);
629err_device_alloc:
630 platform_driver_unregister(&acerhdf_driver);
631 return err;
Peter Feuerere86435e2009-06-21 18:53:03 +0200632}
633
634static void acerhdf_unregister_platform(void)
635{
Axel Lina0dba692010-07-20 15:19:49 -0700636 platform_device_unregister(acerhdf_dev);
Peter Feuererded0cdf2009-08-06 15:57:52 -0700637 platform_driver_unregister(&acerhdf_driver);
Peter Feuerere86435e2009-06-21 18:53:03 +0200638}
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)
Axel Lina0dba692010-07-20 15:19:49 -0700680 goto out_err;
Peter Feuerere86435e2009-06-21 18:53:03 +0200681
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:
Axel Lina0dba692010-07-20 15:19:49 -0700693 return err;
Peter Feuerere86435e2009-06-21 18:53:03 +0200694}
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");
Stefan Baderbdc731b2009-12-21 16:20:04 -0800706MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
Anton V. Boyarshinov2c3422d2011-07-28 18:05:35 +0400707MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
708MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
Peter Feuerer24964632010-07-20 15:19:33 -0700709MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
Stefan Baderbdc731b2009-12-21 16:20:04 -0800710MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
Peter Feuerer94219d72009-12-21 16:20:05 -0800711MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
Anton V. Boyarshinov2c3422d2011-07-28 18:05:35 +0400712MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
713MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
714MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
715MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
Peter Feuerere86435e2009-06-21 18:53:03 +0200716
717module_init(acerhdf_init);
718module_exit(acerhdf_exit);