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 /* 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
259 static 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 */
265 static struct thermal_zone_params acerhdf_zone_params = {
266 .governor_name = "bang_bang",
267 };
268
acerhdf_get_temp(int * temp)269 static 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
acerhdf_get_fanstate(int * state)281 static 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
acerhdf_change_fanstate(int state)296 static 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
acerhdf_check_param(struct thermal_zone_device * thermal)322 static 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 */
acerhdf_get_ec_temp(struct thermal_zone_device * thermal,int * t)349 static 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
acerhdf_bind(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev)366 static 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
acerhdf_unbind(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev)382 static 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
acerhdf_revert_to_bios_mode(void)395 static 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 }
acerhdf_enable_kernelmode(void)403 static 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, THERMAL_EVENT_UNSPECIFIED);
409 pr_notice("kernel mode fan control ON\n");
410 }
411
acerhdf_get_mode(struct thermal_zone_device * thermal,enum thermal_device_mode * mode)412 static 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 */
acerhdf_set_mode(struct thermal_zone_device * thermal,enum thermal_device_mode mode)430 static 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
acerhdf_get_trip_type(struct thermal_zone_device * thermal,int trip,enum thermal_trip_type * type)441 static 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
acerhdf_get_trip_hyst(struct thermal_zone_device * thermal,int trip,int * temp)454 static 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
acerhdf_get_trip_temp(struct thermal_zone_device * thermal,int trip,int * temp)465 static 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
acerhdf_get_crit_temp(struct thermal_zone_device * thermal,int * temperature)478 static 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 */
486 static 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 */
acerhdf_get_max_state(struct thermal_cooling_device * cdev,unsigned long * state)503 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
504 unsigned long *state)
505 {
506 *state = 1;
507
508 return 0;
509 }
510
acerhdf_get_cur_state(struct thermal_cooling_device * cdev,unsigned long * state)511 static 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 */
acerhdf_set_cur_state(struct thermal_cooling_device * cdev,unsigned long state)525 static 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
554 err_out:
555 acerhdf_revert_to_bios_mode();
556 return -EINVAL;
557 }
558
559 /* bind fan callbacks to fan device */
560 static const 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 */
acerhdf_suspend(struct device * dev)567 static 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
acerhdf_probe(struct platform_device * device)578 static int acerhdf_probe(struct platform_device *device)
579 {
580 return 0;
581 }
582
acerhdf_remove(struct platform_device * device)583 static int acerhdf_remove(struct platform_device *device)
584 {
585 return 0;
586 }
587
588 static const struct dev_pm_ops acerhdf_pm_ops = {
589 .suspend = acerhdf_suspend,
590 .freeze = acerhdf_suspend,
591 };
592
593 static 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 */
str_starts_with(const char * str,const char * start)603 static 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 */
acerhdf_check_hardware(void)618 static 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
acerhdf_register_platform(void)683 static 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
702 err_device_add:
703 platform_device_put(acerhdf_dev);
704 err_device_alloc:
705 platform_driver_unregister(&acerhdf_driver);
706 return err;
707 }
708
acerhdf_unregister_platform(void)709 static void acerhdf_unregister_platform(void)
710 {
711 platform_device_unregister(acerhdf_dev);
712 platform_driver_unregister(&acerhdf_driver);
713 }
714
acerhdf_register_thermal(void)715 static 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
acerhdf_unregister_thermal(void)740 static 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
acerhdf_init(void)753 static 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
771 err_unreg:
772 acerhdf_unregister_thermal();
773 acerhdf_unregister_platform();
774
775 out_err:
776 return err;
777 }
778
acerhdf_exit(void)779 static void __exit acerhdf_exit(void)
780 {
781 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
782 acerhdf_unregister_thermal();
783 acerhdf_unregister_platform();
784 }
785
786 MODULE_LICENSE("GPL");
787 MODULE_AUTHOR("Peter Feuerer");
788 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
789 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
790 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
791 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
792 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
793 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:");
794 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
795 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:");
796 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
797 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:");
798 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:");
799 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:");
800 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
801 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:");
802 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
803 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
804 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
805 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
806 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
807 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
808 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
809 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
810 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa 5420*:");
811
812 module_init(acerhdf_init);
813 module_exit(acerhdf_exit);
814
