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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 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 "0.7.0"
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
122struct manualcmd {
123 u8 mreg;
124 u8 moff;
125};
126
127/* default register and command to disable fan in manual mode */
128static const struct manualcmd mcmd = {
129 .mreg = 0x94,
130 .moff = 0xff,
131};
132
133/* BIOS settings */
134struct bios_settings {
135 const char *vendor;
136 const char *product;
137 const char *version;
138 u8 fanreg;
139 u8 tempreg;
140 struct fancmd cmd;
141 int mcmd_enable;
142};
143
144/* Register addresses and values for different BIOS versions */
145static const struct bios_settings bios_tbl[] = {
146 /* AOA110 */
147 {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00}, 0},
148 {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
149 {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00}, 0},
150 {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00}, 0},
151 {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00}, 0},
152 {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00}, 0},
153 {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00}, 0},
154 {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00}, 0},
155 {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00}, 0},
156 /* AOA150 */
157 {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
158 {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00}, 0},
159 {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
160 {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00}, 0},
161 {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00}, 0},
162 {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00}, 0},
163 {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00}, 0},
164 {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
165 /* LT1005u */
166 {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
167 /* Acer 1410 */
168 {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
169 {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
170 {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
171 {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
172 {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
173 {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
174 {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
175 {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
176 {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
177 {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
178 {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
179 /* Acer 1810xx */
180 {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
181 {"Acer", "Aspire 1810T", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
182 {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
183 {"Acer", "Aspire 1810T", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
184 {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
185 {"Acer", "Aspire 1810T", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
186 {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
187 {"Acer", "Aspire 1810T", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
188 {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
189 {"Acer", "Aspire 1810T", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
190 {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
191 {"Acer", "Aspire 1810T", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
192 {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
193 {"Acer", "Aspire 1810T", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
194 {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
195 {"Acer", "Aspire 1810T", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
196 {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
197 {"Acer", "Aspire 1810T", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
198 {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
199 {"Acer", "Aspire 1810T", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
200 {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
201 {"Acer", "Aspire 1810T", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
202 /* Acer 5755G */
203 {"Acer", "Aspire 5755G", "V1.20", 0xab, 0xb4, {0x00, 0x08}, 0},
204 {"Acer", "Aspire 5755G", "V1.21", 0xab, 0xb3, {0x00, 0x08}, 0},
205 /* Acer 521 */
206 {"Acer", "AO521", "V1.11", 0x55, 0x58, {0x1f, 0x00}, 0},
207 /* Acer 531 */
208 {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00}, 0},
209 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00}, 0},
210 {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
211 /* Acer 751 */
212 {"Acer", "AO751h", "V0.3206", 0x55, 0x58, {0x21, 0x00}, 0},
213 {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00}, 0},
214 /* Acer 753 */
215 {"Acer", "Aspire One 753", "V1.24", 0x93, 0xac, {0x14, 0x04}, 1},
216 /* Acer 1825 */
217 {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0},
218 {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0},
219 /* Acer Extensa 5420 */
220 {"Acer", "Extensa 5420", "V1.17", 0x93, 0xac, {0x14, 0x04}, 1},
221 /* Acer Aspire 5315 */
222 {"Acer", "Aspire 5315", "V1.19", 0x93, 0xac, {0x14, 0x04}, 1},
223 /* Acer Aspire 5739 */
224 {"Acer", "Aspire 5739G", "V1.3311", 0x55, 0x58, {0x20, 0x00}, 0},
225 /* Acer TravelMate 7730 */
226 {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00}, 0},
227 /* Acer TravelMate TM8573T */
228 {"Acer", "TM8573T", "V1.13", 0x93, 0xa8, {0x14, 0x04}, 1},
229 /* Gateway */
230 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00}, 0},
231 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00}, 0},
232 {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x9e, 0x00}, 0},
233 {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0},
234 {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0},
235 {"Gateway", "LT31", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
236 /* Packard Bell */
237 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00}, 0},
238 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0},
239 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00}, 0},
240 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0},
241 {"Packard Bell", "ENBFT", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0},
242 {"Packard Bell", "ENBFT", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0},
243 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
244 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
245 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
246 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
247 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
248 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
249 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
250 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
251 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0},
252 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0},
253 {"Packard Bell", "DOTMA", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
254 {"Packard Bell", "DOTVR46", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
255 /* pewpew-terminator */
256 {"", "", "", 0, 0, {0, 0}, 0}
257};
258
259static const struct bios_settings *bios_cfg __read_mostly;
260
261/*
262 * this struct is used to instruct thermal layer to use bang_bang instead of
263 * default governor for acerhdf
264 */
265static struct thermal_zone_params acerhdf_zone_params = {
266 .governor_name = "bang_bang",
267};
268
269static int acerhdf_get_temp(int *temp)
270{
271 u8 read_temp;
272
273 if (ec_read(bios_cfg->tempreg, &read_temp))
274 return -EINVAL;
275
276 *temp = read_temp * 1000;
277
278 return 0;
279}
280
281static int acerhdf_get_fanstate(int *state)
282{
283 u8 fan;
284
285 if (ec_read(bios_cfg->fanreg, &fan))
286 return -EINVAL;
287
288 if (fan != bios_cfg->cmd.cmd_off)
289 *state = ACERHDF_FAN_AUTO;
290 else
291 *state = ACERHDF_FAN_OFF;
292
293 return 0;
294}
295
296static void acerhdf_change_fanstate(int state)
297{
298 unsigned char cmd;
299
300 if (verbose)
301 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON");
302
303 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
304 pr_err("invalid fan state %d requested, setting to auto!\n",
305 state);
306 state = ACERHDF_FAN_AUTO;
307 }
308
309 cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
310 : bios_cfg->cmd.cmd_auto;
311 fanstate = state;
312
313 ec_write(bios_cfg->fanreg, cmd);
314
315 if (bios_cfg->mcmd_enable && state == ACERHDF_FAN_OFF) {
316 if (verbose)
317 pr_notice("turning off fan manually\n");
318 ec_write(mcmd.mreg, mcmd.moff);
319 }
320}
321
322static void acerhdf_check_param(struct thermal_zone_device *thermal)
323{
324 if (fanon > ACERHDF_MAX_FANON) {
325 pr_err("fanon temperature too high, set to %d\n",
326 ACERHDF_MAX_FANON);
327 fanon = ACERHDF_MAX_FANON;
328 }
329
330 if (kernelmode && prev_interval != interval) {
331 if (interval > ACERHDF_MAX_INTERVAL) {
332 pr_err("interval too high, set to %d\n",
333 ACERHDF_MAX_INTERVAL);
334 interval = ACERHDF_MAX_INTERVAL;
335 }
336 if (verbose)
337 pr_notice("interval changed to: %d\n", interval);
338 thermal->polling_delay = interval*1000;
339 prev_interval = interval;
340 }
341}
342
343/*
344 * This is the thermal zone callback which does the delayed polling of the fan
345 * state. We do check /sysfs-originating settings here in acerhdf_check_param()
346 * as late as the polling interval is since we can't do that in the respective
347 * accessors of the module parameters.
348 */
349static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t)
350{
351 int temp, err = 0;
352
353 acerhdf_check_param(thermal);
354
355 err = acerhdf_get_temp(&temp);
356 if (err)
357 return err;
358
359 if (verbose)
360 pr_notice("temp %d\n", temp);
361
362 *t = temp;
363 return 0;
364}
365
366static int acerhdf_bind(struct thermal_zone_device *thermal,
367 struct thermal_cooling_device *cdev)
368{
369 /* if the cooling device is the one from acerhdf bind it */
370 if (cdev != cl_dev)
371 return 0;
372
373 if (thermal_zone_bind_cooling_device(thermal, 0, cdev,
374 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
375 THERMAL_WEIGHT_DEFAULT)) {
376 pr_err("error binding cooling dev\n");
377 return -EINVAL;
378 }
379 return 0;
380}
381
382static int acerhdf_unbind(struct thermal_zone_device *thermal,
383 struct thermal_cooling_device *cdev)
384{
385 if (cdev != cl_dev)
386 return 0;
387
388 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
389 pr_err("error unbinding cooling dev\n");
390 return -EINVAL;
391 }
392 return 0;
393}
394
395static inline void acerhdf_revert_to_bios_mode(void)
396{
397 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
398 kernelmode = 0;
399 if (thz_dev)
400 thz_dev->polling_delay = 0;
401 pr_notice("kernel mode fan control OFF\n");
402}
403static inline void acerhdf_enable_kernelmode(void)
404{
405 kernelmode = 1;
406
407 thz_dev->polling_delay = interval*1000;
408 thermal_zone_device_update(thz_dev);
409 pr_notice("kernel mode fan control ON\n");
410}
411
412static int acerhdf_get_mode(struct thermal_zone_device *thermal,
413 enum thermal_device_mode *mode)
414{
415 if (verbose)
416 pr_notice("kernel mode fan control %d\n", kernelmode);
417
418 *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
419 : THERMAL_DEVICE_DISABLED;
420
421 return 0;
422}
423
424/*
425 * set operation mode;
426 * enabled: the thermal layer of the kernel takes care about
427 * the temperature and the fan.
428 * disabled: the BIOS takes control of the fan.
429 */
430static int acerhdf_set_mode(struct thermal_zone_device *thermal,
431 enum thermal_device_mode mode)
432{
433 if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
434 acerhdf_revert_to_bios_mode();
435 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
436 acerhdf_enable_kernelmode();
437
438 return 0;
439}
440
441static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
442 enum thermal_trip_type *type)
443{
444 if (trip == 0)
445 *type = THERMAL_TRIP_ACTIVE;
446 else if (trip == 1)
447 *type = THERMAL_TRIP_CRITICAL;
448 else
449 return -EINVAL;
450
451 return 0;
452}
453
454static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip,
455 int *temp)
456{
457 if (trip != 0)
458 return -EINVAL;
459
460 *temp = fanon - fanoff;
461
462 return 0;
463}
464
465static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
466 int *temp)
467{
468 if (trip == 0)
469 *temp = fanon;
470 else if (trip == 1)
471 *temp = ACERHDF_TEMP_CRIT;
472 else
473 return -EINVAL;
474
475 return 0;
476}
477
478static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
479 int *temperature)
480{
481 *temperature = ACERHDF_TEMP_CRIT;
482 return 0;
483}
484
485/* bind callback functions to thermalzone */
486static struct thermal_zone_device_ops acerhdf_dev_ops = {
487 .bind = acerhdf_bind,
488 .unbind = acerhdf_unbind,
489 .get_temp = acerhdf_get_ec_temp,
490 .get_mode = acerhdf_get_mode,
491 .set_mode = acerhdf_set_mode,
492 .get_trip_type = acerhdf_get_trip_type,
493 .get_trip_hyst = acerhdf_get_trip_hyst,
494 .get_trip_temp = acerhdf_get_trip_temp,
495 .get_crit_temp = acerhdf_get_crit_temp,
496};
497
498
499/*
500 * cooling device callback functions
501 * get maximal fan cooling state
502 */
503static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
504 unsigned long *state)
505{
506 *state = 1;
507
508 return 0;
509}
510
511static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
512 unsigned long *state)
513{
514 int err = 0, tmp;
515
516 err = acerhdf_get_fanstate(&tmp);
517 if (err)
518 return err;
519
520 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
521 return 0;
522}
523
524/* change current fan state - is overwritten when running in kernel mode */
525static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
526 unsigned long state)
527{
528 int cur_temp, cur_state, err = 0;
529
530 if (!kernelmode)
531 return 0;
532
533 err = acerhdf_get_temp(&cur_temp);
534 if (err) {
535 pr_err("error reading temperature, hand off control to BIOS\n");
536 goto err_out;
537 }
538
539 err = acerhdf_get_fanstate(&cur_state);
540 if (err) {
541 pr_err("error reading fan state, hand off control to BIOS\n");
542 goto err_out;
543 }
544
545 if (state == 0) {
546 if (cur_state == ACERHDF_FAN_AUTO)
547 acerhdf_change_fanstate(ACERHDF_FAN_OFF);
548 } else {
549 if (cur_state == ACERHDF_FAN_OFF)
550 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
551 }
552 return 0;
553
554err_out:
555 acerhdf_revert_to_bios_mode();
556 return -EINVAL;
557}
558
559/* bind fan callbacks to fan device */
560static struct thermal_cooling_device_ops acerhdf_cooling_ops = {
561 .get_max_state = acerhdf_get_max_state,
562 .get_cur_state = acerhdf_get_cur_state,
563 .set_cur_state = acerhdf_set_cur_state,
564};
565
566/* suspend / resume functionality */
567static int acerhdf_suspend(struct device *dev)
568{
569 if (kernelmode)
570 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
571
572 if (verbose)
573 pr_notice("going suspend\n");
574
575 return 0;
576}
577
578static int acerhdf_probe(struct platform_device *device)
579{
580 return 0;
581}
582
583static int acerhdf_remove(struct platform_device *device)
584{
585 return 0;
586}
587
588static const struct dev_pm_ops acerhdf_pm_ops = {
589 .suspend = acerhdf_suspend,
590 .freeze = acerhdf_suspend,
591};
592
593static struct platform_driver acerhdf_driver = {
594 .driver = {
595 .name = "acerhdf",
596 .pm = &acerhdf_pm_ops,
597 },
598 .probe = acerhdf_probe,
599 .remove = acerhdf_remove,
600};
601
602/* checks if str begins with start */
603static int str_starts_with(const char *str, const char *start)
604{
605 unsigned long str_len = 0, start_len = 0;
606
607 str_len = strlen(str);
608 start_len = strlen(start);
609
610 if (str_len >= start_len &&
611 !strncmp(str, start, start_len))
612 return 1;
613
614 return 0;
615}
616
617/* check hardware */
618static int acerhdf_check_hardware(void)
619{
620 char const *vendor, *version, *product;
621 const struct bios_settings *bt = NULL;
622
623 /* get BIOS data */
624 vendor = dmi_get_system_info(DMI_SYS_VENDOR);
625 version = dmi_get_system_info(DMI_BIOS_VERSION);
626 product = dmi_get_system_info(DMI_PRODUCT_NAME);
627
628 if (!vendor || !version || !product) {
629 pr_err("error getting hardware information\n");
630 return -EINVAL;
631 }
632
633 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
634
635 if (force_bios[0]) {
636 version = force_bios;
637 pr_info("forcing BIOS version: %s\n", version);
638 kernelmode = 0;
639 }
640
641 if (force_product[0]) {
642 product = force_product;
643 pr_info("forcing BIOS product: %s\n", product);
644 kernelmode = 0;
645 }
646
647 if (verbose)
648 pr_info("BIOS info: %s %s, product: %s\n",
649 vendor, version, product);
650
651 /* search BIOS version and vendor in BIOS settings table */
652 for (bt = bios_tbl; bt->vendor[0]; bt++) {
653 /*
654 * check if actual hardware BIOS vendor, product and version
655 * IDs start with the strings of BIOS table entry
656 */
657 if (str_starts_with(vendor, bt->vendor) &&
658 str_starts_with(product, bt->product) &&
659 str_starts_with(version, bt->version)) {
660 bios_cfg = bt;
661 break;
662 }
663 }
664
665 if (!bios_cfg) {
666 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
667 vendor, product, version);
668 return -EINVAL;
669 }
670
671 /*
672 * if started with kernel mode off, prevent the kernel from switching
673 * off the fan
674 */
675 if (!kernelmode) {
676 pr_notice("Fan control off, to enable do:\n");
677 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zone0/mode\n");
678 }
679
680 return 0;
681}
682
683static int acerhdf_register_platform(void)
684{
685 int err = 0;
686
687 err = platform_driver_register(&acerhdf_driver);
688 if (err)
689 return err;
690
691 acerhdf_dev = platform_device_alloc("acerhdf", -1);
692 if (!acerhdf_dev) {
693 err = -ENOMEM;
694 goto err_device_alloc;
695 }
696 err = platform_device_add(acerhdf_dev);
697 if (err)
698 goto err_device_add;
699
700 return 0;
701
702err_device_add:
703 platform_device_put(acerhdf_dev);
704err_device_alloc:
705 platform_driver_unregister(&acerhdf_driver);
706 return err;
707}
708
709static void acerhdf_unregister_platform(void)
710{
711 platform_device_unregister(acerhdf_dev);
712 platform_driver_unregister(&acerhdf_driver);
713}
714
715static int acerhdf_register_thermal(void)
716{
717 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
718 &acerhdf_cooling_ops);
719
720 if (IS_ERR(cl_dev))
721 return -EINVAL;
722
723 thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL,
724 &acerhdf_dev_ops,
725 &acerhdf_zone_params, 0,
726 (kernelmode) ? interval*1000 : 0);
727 if (IS_ERR(thz_dev))
728 return -EINVAL;
729
730 if (strcmp(thz_dev->governor->name,
731 acerhdf_zone_params.governor_name)) {
732 pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
733 acerhdf_zone_params.governor_name);
734 return -EINVAL;
735 }
736
737 return 0;
738}
739
740static void acerhdf_unregister_thermal(void)
741{
742 if (cl_dev) {
743 thermal_cooling_device_unregister(cl_dev);
744 cl_dev = NULL;
745 }
746
747 if (thz_dev) {
748 thermal_zone_device_unregister(thz_dev);
749 thz_dev = NULL;
750 }
751}
752
753static int __init acerhdf_init(void)
754{
755 int err = 0;
756
757 err = acerhdf_check_hardware();
758 if (err)
759 goto out_err;
760
761 err = acerhdf_register_platform();
762 if (err)
763 goto out_err;
764
765 err = acerhdf_register_thermal();
766 if (err)
767 goto err_unreg;
768
769 return 0;
770
771err_unreg:
772 acerhdf_unregister_thermal();
773 acerhdf_unregister_platform();
774
775out_err:
776 return err;
777}
778
779static void __exit acerhdf_exit(void)
780{
781 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
782 acerhdf_unregister_thermal();
783 acerhdf_unregister_platform();
784}
785
786MODULE_LICENSE("GPL");
787MODULE_AUTHOR("Peter Feuerer");
788MODULE_DESCRIPTION("Aspire One temperature and fan driver");
789MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
790MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
791MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
792MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
793MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:");
794MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
795MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:");
796MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
797MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:");
798MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:");
799MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:");
800MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
801MODULE_ALIAS("dmi:*:*Acer*:TM8573T:");
802MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
803MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
804MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
805MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
806MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
807MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
808MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
809MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
810MODULE_ALIAS("dmi:*:*Acer*:pnExtensa 5420*:");
811
812module_init(acerhdf_init);
813module_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 <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);