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
80 static int kernelmode = 1;
81 #else
82 static int kernelmode;
83 #endif
84
85 static unsigned int interval = 10;
86 static unsigned int fanon = 60000;
87 static unsigned int fanoff = 53000;
88 static unsigned int verbose;
89 static unsigned int fanstate = ACERHDF_FAN_AUTO;
90 static char force_bios[16];
91 static char force_product[16];
92 static unsigned int prev_interval;
93 static struct thermal_zone_device *thz_dev;
94 static struct thermal_cooling_device *cl_dev;
95 static struct platform_device *acerhdf_dev;
96
97 module_param(kernelmode, uint, 0);
98 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
99 module_param(interval, uint, 0600);
100 MODULE_PARM_DESC(interval, "Polling interval of temperature check");
101 module_param(fanon, uint, 0600);
102 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
103 module_param(fanoff, uint, 0600);
104 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
105 module_param(verbose, uint, 0600);
106 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
107 module_param_string(force_bios, force_bios, 16, 0);
108 MODULE_PARM_DESC(force_bios, "Force BIOS version and omit BIOS check");
109 module_param_string(force_product, force_product, 16, 0);
110 MODULE_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 */
117 struct fancmd {
118 u8 cmd_off;
119 u8 cmd_auto;
120 };
121
122 struct manualcmd {
123 u8 mreg;
124 u8 moff;
125 };
126
127 /* default register and command to disable fan in manual mode */
128 static const struct manualcmd mcmd = {
129 .mreg = 0x94,
130 .moff = 0xff,
131 };
132
133 /* BIOS settings */
134 struct 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 */
145 static 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 {"Gateway", "LT31", "v1.3307", 0x55, 0x58, {0x9e, 0x00}, 0},
237 /* Packard Bell */
238 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00}, 0},
239 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0},
240 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00}, 0},
241 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0},
242 {"Packard Bell", "ENBFT", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0},
243 {"Packard Bell", "ENBFT", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0},
244 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
245 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
246 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
247 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
248 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
249 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
250 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
251 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
252 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0},
253 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0},
254 {"Packard Bell", "DOTMA", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
255 {"Packard Bell", "DOTVR46", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
256 /* pewpew-terminator */
257 {"", "", "", 0, 0, {0, 0}, 0}
258 };
259
260 static const struct bios_settings *bios_cfg __read_mostly;
261
262 /*
263 * this struct is used to instruct thermal layer to use bang_bang instead of
264 * default governor for acerhdf
265 */
266 static struct thermal_zone_params acerhdf_zone_params = {
267 .governor_name = "bang_bang",
268 };
269
acerhdf_get_temp(int * temp)270 static int acerhdf_get_temp(int *temp)
271 {
272 u8 read_temp;
273
274 if (ec_read(bios_cfg->tempreg, &read_temp))
275 return -EINVAL;
276
277 *temp = read_temp * 1000;
278
279 return 0;
280 }
281
acerhdf_get_fanstate(int * state)282 static int acerhdf_get_fanstate(int *state)
283 {
284 u8 fan;
285
286 if (ec_read(bios_cfg->fanreg, &fan))
287 return -EINVAL;
288
289 if (fan != bios_cfg->cmd.cmd_off)
290 *state = ACERHDF_FAN_AUTO;
291 else
292 *state = ACERHDF_FAN_OFF;
293
294 return 0;
295 }
296
acerhdf_change_fanstate(int state)297 static void acerhdf_change_fanstate(int state)
298 {
299 unsigned char cmd;
300
301 if (verbose)
302 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON");
303
304 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
305 pr_err("invalid fan state %d requested, setting to auto!\n",
306 state);
307 state = ACERHDF_FAN_AUTO;
308 }
309
310 cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
311 : bios_cfg->cmd.cmd_auto;
312 fanstate = state;
313
314 ec_write(bios_cfg->fanreg, cmd);
315
316 if (bios_cfg->mcmd_enable && state == ACERHDF_FAN_OFF) {
317 if (verbose)
318 pr_notice("turning off fan manually\n");
319 ec_write(mcmd.mreg, mcmd.moff);
320 }
321 }
322
acerhdf_check_param(struct thermal_zone_device * thermal)323 static void acerhdf_check_param(struct thermal_zone_device *thermal)
324 {
325 if (fanon > ACERHDF_MAX_FANON) {
326 pr_err("fanon temperature too high, set to %d\n",
327 ACERHDF_MAX_FANON);
328 fanon = ACERHDF_MAX_FANON;
329 }
330
331 if (kernelmode && prev_interval != interval) {
332 if (interval > ACERHDF_MAX_INTERVAL) {
333 pr_err("interval too high, set to %d\n",
334 ACERHDF_MAX_INTERVAL);
335 interval = ACERHDF_MAX_INTERVAL;
336 }
337 if (verbose)
338 pr_notice("interval changed to: %d\n", interval);
339 thermal->polling_delay = interval*1000;
340 prev_interval = interval;
341 }
342 }
343
344 /*
345 * This is the thermal zone callback which does the delayed polling of the fan
346 * state. We do check /sysfs-originating settings here in acerhdf_check_param()
347 * as late as the polling interval is since we can't do that in the respective
348 * accessors of the module parameters.
349 */
acerhdf_get_ec_temp(struct thermal_zone_device * thermal,int * t)350 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t)
351 {
352 int temp, err = 0;
353
354 acerhdf_check_param(thermal);
355
356 err = acerhdf_get_temp(&temp);
357 if (err)
358 return err;
359
360 if (verbose)
361 pr_notice("temp %d\n", temp);
362
363 *t = temp;
364 return 0;
365 }
366
acerhdf_bind(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev)367 static int acerhdf_bind(struct thermal_zone_device *thermal,
368 struct thermal_cooling_device *cdev)
369 {
370 /* if the cooling device is the one from acerhdf bind it */
371 if (cdev != cl_dev)
372 return 0;
373
374 if (thermal_zone_bind_cooling_device(thermal, 0, cdev,
375 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
376 THERMAL_WEIGHT_DEFAULT)) {
377 pr_err("error binding cooling dev\n");
378 return -EINVAL;
379 }
380 return 0;
381 }
382
acerhdf_unbind(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev)383 static int acerhdf_unbind(struct thermal_zone_device *thermal,
384 struct thermal_cooling_device *cdev)
385 {
386 if (cdev != cl_dev)
387 return 0;
388
389 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
390 pr_err("error unbinding cooling dev\n");
391 return -EINVAL;
392 }
393 return 0;
394 }
395
acerhdf_revert_to_bios_mode(void)396 static inline void acerhdf_revert_to_bios_mode(void)
397 {
398 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
399 kernelmode = 0;
400 if (thz_dev)
401 thz_dev->polling_delay = 0;
402 pr_notice("kernel mode fan control OFF\n");
403 }
acerhdf_enable_kernelmode(void)404 static inline void acerhdf_enable_kernelmode(void)
405 {
406 kernelmode = 1;
407
408 thz_dev->polling_delay = interval*1000;
409 thermal_zone_device_update(thz_dev);
410 pr_notice("kernel mode fan control ON\n");
411 }
412
acerhdf_get_mode(struct thermal_zone_device * thermal,enum thermal_device_mode * mode)413 static int acerhdf_get_mode(struct thermal_zone_device *thermal,
414 enum thermal_device_mode *mode)
415 {
416 if (verbose)
417 pr_notice("kernel mode fan control %d\n", kernelmode);
418
419 *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
420 : THERMAL_DEVICE_DISABLED;
421
422 return 0;
423 }
424
425 /*
426 * set operation mode;
427 * enabled: the thermal layer of the kernel takes care about
428 * the temperature and the fan.
429 * disabled: the BIOS takes control of the fan.
430 */
acerhdf_set_mode(struct thermal_zone_device * thermal,enum thermal_device_mode mode)431 static int acerhdf_set_mode(struct thermal_zone_device *thermal,
432 enum thermal_device_mode mode)
433 {
434 if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
435 acerhdf_revert_to_bios_mode();
436 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
437 acerhdf_enable_kernelmode();
438
439 return 0;
440 }
441
acerhdf_get_trip_type(struct thermal_zone_device * thermal,int trip,enum thermal_trip_type * type)442 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
443 enum thermal_trip_type *type)
444 {
445 if (trip == 0)
446 *type = THERMAL_TRIP_ACTIVE;
447 else if (trip == 1)
448 *type = THERMAL_TRIP_CRITICAL;
449 else
450 return -EINVAL;
451
452 return 0;
453 }
454
acerhdf_get_trip_hyst(struct thermal_zone_device * thermal,int trip,int * temp)455 static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip,
456 int *temp)
457 {
458 if (trip != 0)
459 return -EINVAL;
460
461 *temp = fanon - fanoff;
462
463 return 0;
464 }
465
acerhdf_get_trip_temp(struct thermal_zone_device * thermal,int trip,int * temp)466 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
467 int *temp)
468 {
469 if (trip == 0)
470 *temp = fanon;
471 else if (trip == 1)
472 *temp = ACERHDF_TEMP_CRIT;
473 else
474 return -EINVAL;
475
476 return 0;
477 }
478
acerhdf_get_crit_temp(struct thermal_zone_device * thermal,int * temperature)479 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
480 int *temperature)
481 {
482 *temperature = ACERHDF_TEMP_CRIT;
483 return 0;
484 }
485
486 /* bind callback functions to thermalzone */
487 static struct thermal_zone_device_ops acerhdf_dev_ops = {
488 .bind = acerhdf_bind,
489 .unbind = acerhdf_unbind,
490 .get_temp = acerhdf_get_ec_temp,
491 .get_mode = acerhdf_get_mode,
492 .set_mode = acerhdf_set_mode,
493 .get_trip_type = acerhdf_get_trip_type,
494 .get_trip_hyst = acerhdf_get_trip_hyst,
495 .get_trip_temp = acerhdf_get_trip_temp,
496 .get_crit_temp = acerhdf_get_crit_temp,
497 };
498
499
500 /*
501 * cooling device callback functions
502 * get maximal fan cooling state
503 */
acerhdf_get_max_state(struct thermal_cooling_device * cdev,unsigned long * state)504 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
505 unsigned long *state)
506 {
507 *state = 1;
508
509 return 0;
510 }
511
acerhdf_get_cur_state(struct thermal_cooling_device * cdev,unsigned long * state)512 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
513 unsigned long *state)
514 {
515 int err = 0, tmp;
516
517 err = acerhdf_get_fanstate(&tmp);
518 if (err)
519 return err;
520
521 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
522 return 0;
523 }
524
525 /* change current fan state - is overwritten when running in kernel mode */
acerhdf_set_cur_state(struct thermal_cooling_device * cdev,unsigned long state)526 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
527 unsigned long state)
528 {
529 int cur_temp, cur_state, err = 0;
530
531 if (!kernelmode)
532 return 0;
533
534 err = acerhdf_get_temp(&cur_temp);
535 if (err) {
536 pr_err("error reading temperature, hand off control to BIOS\n");
537 goto err_out;
538 }
539
540 err = acerhdf_get_fanstate(&cur_state);
541 if (err) {
542 pr_err("error reading fan state, hand off control to BIOS\n");
543 goto err_out;
544 }
545
546 if (state == 0) {
547 if (cur_state == ACERHDF_FAN_AUTO)
548 acerhdf_change_fanstate(ACERHDF_FAN_OFF);
549 } else {
550 if (cur_state == ACERHDF_FAN_OFF)
551 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
552 }
553 return 0;
554
555 err_out:
556 acerhdf_revert_to_bios_mode();
557 return -EINVAL;
558 }
559
560 /* bind fan callbacks to fan device */
561 static struct thermal_cooling_device_ops acerhdf_cooling_ops = {
562 .get_max_state = acerhdf_get_max_state,
563 .get_cur_state = acerhdf_get_cur_state,
564 .set_cur_state = acerhdf_set_cur_state,
565 };
566
567 /* suspend / resume functionality */
acerhdf_suspend(struct device * dev)568 static int acerhdf_suspend(struct device *dev)
569 {
570 if (kernelmode)
571 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
572
573 if (verbose)
574 pr_notice("going suspend\n");
575
576 return 0;
577 }
578
acerhdf_probe(struct platform_device * device)579 static int acerhdf_probe(struct platform_device *device)
580 {
581 return 0;
582 }
583
acerhdf_remove(struct platform_device * device)584 static int acerhdf_remove(struct platform_device *device)
585 {
586 return 0;
587 }
588
589 static const struct dev_pm_ops acerhdf_pm_ops = {
590 .suspend = acerhdf_suspend,
591 .freeze = acerhdf_suspend,
592 };
593
594 static struct platform_driver acerhdf_driver = {
595 .driver = {
596 .name = "acerhdf",
597 .pm = &acerhdf_pm_ops,
598 },
599 .probe = acerhdf_probe,
600 .remove = acerhdf_remove,
601 };
602
603 /* checks if str begins with start */
str_starts_with(const char * str,const char * start)604 static int str_starts_with(const char *str, const char *start)
605 {
606 unsigned long str_len = 0, start_len = 0;
607
608 str_len = strlen(str);
609 start_len = strlen(start);
610
611 if (str_len >= start_len &&
612 !strncmp(str, start, start_len))
613 return 1;
614
615 return 0;
616 }
617
618 /* check hardware */
acerhdf_check_hardware(void)619 static int acerhdf_check_hardware(void)
620 {
621 char const *vendor, *version, *product;
622 const struct bios_settings *bt = NULL;
623
624 /* get BIOS data */
625 vendor = dmi_get_system_info(DMI_SYS_VENDOR);
626 version = dmi_get_system_info(DMI_BIOS_VERSION);
627 product = dmi_get_system_info(DMI_PRODUCT_NAME);
628
629 if (!vendor || !version || !product) {
630 pr_err("error getting hardware information\n");
631 return -EINVAL;
632 }
633
634 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
635
636 if (force_bios[0]) {
637 version = force_bios;
638 pr_info("forcing BIOS version: %s\n", version);
639 kernelmode = 0;
640 }
641
642 if (force_product[0]) {
643 product = force_product;
644 pr_info("forcing BIOS product: %s\n", product);
645 kernelmode = 0;
646 }
647
648 if (verbose)
649 pr_info("BIOS info: %s %s, product: %s\n",
650 vendor, version, product);
651
652 /* search BIOS version and vendor in BIOS settings table */
653 for (bt = bios_tbl; bt->vendor[0]; bt++) {
654 /*
655 * check if actual hardware BIOS vendor, product and version
656 * IDs start with the strings of BIOS table entry
657 */
658 if (str_starts_with(vendor, bt->vendor) &&
659 str_starts_with(product, bt->product) &&
660 str_starts_with(version, bt->version)) {
661 bios_cfg = bt;
662 break;
663 }
664 }
665
666 if (!bios_cfg) {
667 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
668 vendor, product, version);
669 return -EINVAL;
670 }
671
672 /*
673 * if started with kernel mode off, prevent the kernel from switching
674 * off the fan
675 */
676 if (!kernelmode) {
677 pr_notice("Fan control off, to enable do:\n");
678 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zone0/mode\n");
679 }
680
681 return 0;
682 }
683
acerhdf_register_platform(void)684 static int acerhdf_register_platform(void)
685 {
686 int err = 0;
687
688 err = platform_driver_register(&acerhdf_driver);
689 if (err)
690 return err;
691
692 acerhdf_dev = platform_device_alloc("acerhdf", -1);
693 if (!acerhdf_dev) {
694 err = -ENOMEM;
695 goto err_device_alloc;
696 }
697 err = platform_device_add(acerhdf_dev);
698 if (err)
699 goto err_device_add;
700
701 return 0;
702
703 err_device_add:
704 platform_device_put(acerhdf_dev);
705 err_device_alloc:
706 platform_driver_unregister(&acerhdf_driver);
707 return err;
708 }
709
acerhdf_unregister_platform(void)710 static void acerhdf_unregister_platform(void)
711 {
712 platform_device_unregister(acerhdf_dev);
713 platform_driver_unregister(&acerhdf_driver);
714 }
715
acerhdf_register_thermal(void)716 static int acerhdf_register_thermal(void)
717 {
718 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
719 &acerhdf_cooling_ops);
720
721 if (IS_ERR(cl_dev))
722 return -EINVAL;
723
724 thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL,
725 &acerhdf_dev_ops,
726 &acerhdf_zone_params, 0,
727 (kernelmode) ? interval*1000 : 0);
728 if (IS_ERR(thz_dev))
729 return -EINVAL;
730
731 if (strcmp(thz_dev->governor->name,
732 acerhdf_zone_params.governor_name)) {
733 pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
734 acerhdf_zone_params.governor_name);
735 return -EINVAL;
736 }
737
738 return 0;
739 }
740
acerhdf_unregister_thermal(void)741 static void acerhdf_unregister_thermal(void)
742 {
743 if (cl_dev) {
744 thermal_cooling_device_unregister(cl_dev);
745 cl_dev = NULL;
746 }
747
748 if (thz_dev) {
749 thermal_zone_device_unregister(thz_dev);
750 thz_dev = NULL;
751 }
752 }
753
acerhdf_init(void)754 static int __init acerhdf_init(void)
755 {
756 int err = 0;
757
758 err = acerhdf_check_hardware();
759 if (err)
760 goto out_err;
761
762 err = acerhdf_register_platform();
763 if (err)
764 goto out_err;
765
766 err = acerhdf_register_thermal();
767 if (err)
768 goto err_unreg;
769
770 return 0;
771
772 err_unreg:
773 acerhdf_unregister_thermal();
774 acerhdf_unregister_platform();
775
776 out_err:
777 return err;
778 }
779
acerhdf_exit(void)780 static void __exit acerhdf_exit(void)
781 {
782 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
783 acerhdf_unregister_thermal();
784 acerhdf_unregister_platform();
785 }
786
787 MODULE_LICENSE("GPL");
788 MODULE_AUTHOR("Peter Feuerer");
789 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
790 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
791 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
792 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
793 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
794 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:");
795 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
796 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:");
797 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
798 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:");
799 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:");
800 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:");
801 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
802 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:");
803 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
804 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
805 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
806 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
807 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
808 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
809 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
810 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
811 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa 5420*:");
812
813 module_init(acerhdf_init);
814 module_exit(acerhdf_exit);
815