1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * acerhdf - A driver which monitors the temperature
4 * of the aspire one netbook, turns on/off the fan
5 * as soon as the upper/lower threshold is reached.
6 *
7 * (C) 2009 - Peter Kaestle peter (a) piie.net
8 * https://piie.net
9 * 2009 Borislav Petkov bp (a) alien8.de
10 *
11 * Inspired by and many thanks to:
12 * o acerfand - Rachel Greenham
13 * o acer_ec.pl - Michael Kurz michi.kurz (at) googlemail.com
14 * - Petr Tomasek tomasek (#) etf,cuni,cz
15 * - Carlos Corbacho cathectic (at) gmail.com
16 * o lkml - Matthew Garrett
17 * - Borislav Petkov
18 * - Andreas Mohr
19 */
20
21 #define pr_fmt(fmt) "acerhdf: " fmt
22
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/dmi.h>
26 #include <linux/acpi.h>
27 #include <linux/thermal.h>
28 #include <linux/platform_device.h>
29
30 /*
31 * The driver is started with "kernel mode off" by default. That means, the BIOS
32 * is still in control of the fan. In this mode the driver allows to read the
33 * temperature of the cpu and a userspace tool may take over control of the fan.
34 * If the driver is switched to "kernel mode" (e.g. via module parameter) the
35 * driver is in full control of the fan. If you want the module to be started in
36 * kernel mode by default, define the following:
37 */
38 #undef START_IN_KERNEL_MODE
39
40 #define DRV_VER "0.7.0"
41
42 /*
43 * According to the Atom N270 datasheet,
44 * (http://download.intel.com/design/processor/datashts/320032.pdf) the
45 * CPU's optimal operating limits denoted in junction temperature as
46 * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So,
47 * assume 89°C is critical temperature.
48 */
49 #define ACERHDF_DEFAULT_TEMP_FANON 60000
50 #define ACERHDF_DEFAULT_TEMP_FANOFF 53000
51 #define ACERHDF_TEMP_CRIT 89000
52 #define ACERHDF_FAN_OFF 0
53 #define ACERHDF_FAN_AUTO 1
54
55 /*
56 * No matter what value the user puts into the fanon variable, turn on the fan
57 * at 80 degree Celsius to prevent hardware damage
58 */
59 #define ACERHDF_MAX_FANON 80000
60
61 /*
62 * Maximum interval between two temperature checks is 15 seconds, as the die
63 * can get hot really fast under heavy load (plus we shouldn't forget about
64 * possible impact of _external_ aggressive sources such as heaters, sun etc.)
65 */
66 #define ACERHDF_MAX_INTERVAL 15
67
68 #ifdef START_IN_KERNEL_MODE
69 static int kernelmode = 1;
70 #else
71 static int kernelmode;
72 #endif
73
74 static unsigned int interval = 10;
75 static unsigned int fanon = ACERHDF_DEFAULT_TEMP_FANON;
76 static unsigned int fanoff = ACERHDF_DEFAULT_TEMP_FANOFF;
77 static unsigned int verbose;
78 static unsigned int list_supported;
79 static unsigned int fanstate = ACERHDF_FAN_AUTO;
80 static char force_bios[16];
81 static char force_product[16];
82 static struct thermal_zone_device *thz_dev;
83 static struct thermal_cooling_device *cl_dev;
84 static struct platform_device *acerhdf_dev;
85
86 module_param(kernelmode, uint, 0);
87 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
88 module_param(fanon, uint, 0600);
89 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
90 module_param(fanoff, uint, 0600);
91 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
92 module_param(verbose, uint, 0600);
93 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
94 module_param(list_supported, uint, 0600);
95 MODULE_PARM_DESC(list_supported, "List supported models and BIOS versions");
96 module_param_string(force_bios, force_bios, 16, 0);
97 MODULE_PARM_DESC(force_bios, "Pretend system has this known supported BIOS version");
98 module_param_string(force_product, force_product, 16, 0);
99 MODULE_PARM_DESC(force_product, "Pretend system is this known supported model");
100
101 /*
102 * cmd_off: to switch the fan completely off and check if the fan is off
103 * cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
104 * the fan speed depending on the temperature
105 */
106 struct fancmd {
107 u8 cmd_off;
108 u8 cmd_auto;
109 };
110
111 struct manualcmd {
112 u8 mreg;
113 u8 moff;
114 };
115
116 /* default register and command to disable fan in manual mode */
117 static const struct manualcmd mcmd = {
118 .mreg = 0x94,
119 .moff = 0xff,
120 };
121
122 /* BIOS settings - only used during probe */
123 struct bios_settings {
124 const char *vendor;
125 const char *product;
126 const char *version;
127 u8 fanreg;
128 u8 tempreg;
129 struct fancmd cmd;
130 int mcmd_enable;
131 };
132
133 /* This could be a daughter struct in the above, but not worth the redirect */
134 struct ctrl_settings {
135 u8 fanreg;
136 u8 tempreg;
137 struct fancmd cmd;
138 int mcmd_enable;
139 };
140
141 static struct thermal_trip trips[] = {
142 [0] = { .temperature = ACERHDF_DEFAULT_TEMP_FANON,
143 .hysteresis = ACERHDF_DEFAULT_TEMP_FANON - ACERHDF_DEFAULT_TEMP_FANOFF,
144 .type = THERMAL_TRIP_ACTIVE },
145
146 [1] = { .temperature = ACERHDF_TEMP_CRIT,
147 .type = THERMAL_TRIP_CRITICAL }
148 };
149
150 static struct ctrl_settings ctrl_cfg __read_mostly;
151
152 /* Register addresses and values for different BIOS versions */
153 static const struct bios_settings bios_tbl[] __initconst = {
154 /* AOA110 */
155 {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00}, 0},
156 {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
157 {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00}, 0},
158 {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00}, 0},
159 {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00}, 0},
160 {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00}, 0},
161 {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00}, 0},
162 {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00}, 0},
163 {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00}, 0},
164 /* AOA150 */
165 {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
166 {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00}, 0},
167 {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
168 {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00}, 0},
169 {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00}, 0},
170 {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00}, 0},
171 {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00}, 0},
172 {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
173 /* LT1005u */
174 {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
175 /* Acer 1410 */
176 {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
177 {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
178 {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
179 {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
180 {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
181 {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
182 {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
183 {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
184 {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
185 {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
186 {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
187 /* Acer 1810xx */
188 {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
189 {"Acer", "Aspire 1810T", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
190 {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
191 {"Acer", "Aspire 1810T", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
192 {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
193 {"Acer", "Aspire 1810T", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
194 {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
195 {"Acer", "Aspire 1810T", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
196 {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
197 {"Acer", "Aspire 1810T", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
198 {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
199 {"Acer", "Aspire 1810T", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
200 {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
201 {"Acer", "Aspire 1810T", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
202 {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
203 {"Acer", "Aspire 1810T", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
204 {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
205 {"Acer", "Aspire 1810T", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
206 {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
207 {"Acer", "Aspire 1810T", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
208 {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
209 {"Acer", "Aspire 1810T", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
210 /* Acer 5755G */
211 {"Acer", "Aspire 5755G", "V1.20", 0xab, 0xb4, {0x00, 0x08}, 0},
212 {"Acer", "Aspire 5755G", "V1.21", 0xab, 0xb3, {0x00, 0x08}, 0},
213 /* Acer 521 */
214 {"Acer", "AO521", "V1.11", 0x55, 0x58, {0x1f, 0x00}, 0},
215 /* Acer 531 */
216 {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00}, 0},
217 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00}, 0},
218 {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
219 /* Acer 751 */
220 {"Acer", "AO751h", "V0.3206", 0x55, 0x58, {0x21, 0x00}, 0},
221 {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00}, 0},
222 /* Acer 753 */
223 {"Acer", "Aspire One 753", "V1.24", 0x93, 0xac, {0x14, 0x04}, 1},
224 /* Acer 1825 */
225 {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0},
226 {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0},
227 /* Acer Extensa 5420 */
228 {"Acer", "Extensa 5420", "V1.17", 0x93, 0xac, {0x14, 0x04}, 1},
229 /* Acer Aspire 5315 */
230 {"Acer", "Aspire 5315", "V1.19", 0x93, 0xac, {0x14, 0x04}, 1},
231 /* Acer Aspire 5739 */
232 {"Acer", "Aspire 5739G", "V1.3311", 0x55, 0x58, {0x20, 0x00}, 0},
233 /* Acer TravelMate 7730 */
234 {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00}, 0},
235 /* Acer Aspire 7551 */
236 {"Acer", "Aspire 7551", "V1.18", 0x93, 0xa8, {0x14, 0x04}, 1},
237 /* Acer TravelMate TM8573T */
238 {"Acer", "TM8573T", "V1.13", 0x93, 0xa8, {0x14, 0x04}, 1},
239 /* Gateway */
240 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00}, 0},
241 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00}, 0},
242 {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x9e, 0x00}, 0},
243 {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0},
244 {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0},
245 {"Gateway", "LT31", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
246 {"Gateway", "LT31", "v1.3307", 0x55, 0x58, {0x9e, 0x00}, 0},
247 /* Packard Bell */
248 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00}, 0},
249 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0},
250 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00}, 0},
251 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0},
252 {"Packard Bell", "ENBFT", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0},
253 {"Packard Bell", "ENBFT", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0},
254 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
255 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
256 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
257 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
258 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
259 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
260 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
261 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
262 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0},
263 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0},
264 {"Packard Bell", "DOTMA", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
265 {"Packard Bell", "DOTVR46", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
266 /* pewpew-terminator */
267 {"", "", "", 0, 0, {0, 0}, 0}
268 };
269
270 /*
271 * this struct is used to instruct thermal layer to use bang_bang instead of
272 * default governor for acerhdf
273 */
274 static struct thermal_zone_params acerhdf_zone_params = {
275 .governor_name = "bang_bang",
276 };
277
acerhdf_get_temp(int * temp)278 static int acerhdf_get_temp(int *temp)
279 {
280 u8 read_temp;
281
282 if (ec_read(ctrl_cfg.tempreg, &read_temp))
283 return -EINVAL;
284
285 *temp = read_temp * 1000;
286
287 return 0;
288 }
289
acerhdf_get_fanstate(int * state)290 static int acerhdf_get_fanstate(int *state)
291 {
292 u8 fan;
293
294 if (ec_read(ctrl_cfg.fanreg, &fan))
295 return -EINVAL;
296
297 if (fan != ctrl_cfg.cmd.cmd_off)
298 *state = ACERHDF_FAN_AUTO;
299 else
300 *state = ACERHDF_FAN_OFF;
301
302 return 0;
303 }
304
acerhdf_change_fanstate(int state)305 static void acerhdf_change_fanstate(int state)
306 {
307 unsigned char cmd;
308
309 if (verbose)
310 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON");
311
312 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
313 pr_err("invalid fan state %d requested, setting to auto!\n",
314 state);
315 state = ACERHDF_FAN_AUTO;
316 }
317
318 cmd = (state == ACERHDF_FAN_OFF) ? ctrl_cfg.cmd.cmd_off
319 : ctrl_cfg.cmd.cmd_auto;
320 fanstate = state;
321
322 ec_write(ctrl_cfg.fanreg, cmd);
323
324 if (ctrl_cfg.mcmd_enable && state == ACERHDF_FAN_OFF) {
325 if (verbose)
326 pr_notice("turning off fan manually\n");
327 ec_write(mcmd.mreg, mcmd.moff);
328 }
329 }
330
acerhdf_check_param(struct thermal_zone_device * thermal)331 static void acerhdf_check_param(struct thermal_zone_device *thermal)
332 {
333 if (fanon > ACERHDF_MAX_FANON) {
334 pr_err("fanon temperature too high, set to %d\n",
335 ACERHDF_MAX_FANON);
336 fanon = ACERHDF_MAX_FANON;
337 }
338
339 if (fanon < fanoff) {
340 pr_err("fanoff temperature (%d) is above fanon temperature (%d), clamping to %d\n",
341 fanoff, fanon, fanon);
342 fanoff = fanon;
343 }
344
345 trips[0].temperature = fanon;
346 trips[0].hysteresis = fanon - fanoff;
347
348 if (kernelmode) {
349 if (interval > ACERHDF_MAX_INTERVAL) {
350 pr_err("interval too high, set to %d\n",
351 ACERHDF_MAX_INTERVAL);
352 interval = ACERHDF_MAX_INTERVAL;
353 }
354
355 if (verbose)
356 pr_notice("interval changed to: %d\n", interval);
357 }
358 }
359
360 /*
361 * This is the thermal zone callback which does the delayed polling of the fan
362 * state. We do check /sysfs-originating settings here in acerhdf_check_param()
363 * as late as the polling interval is since we can't do that in the respective
364 * accessors of the module parameters.
365 */
acerhdf_get_ec_temp(struct thermal_zone_device * thermal,int * t)366 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t)
367 {
368 int temp, err = 0;
369
370 err = acerhdf_get_temp(&temp);
371 if (err)
372 return err;
373
374 if (verbose)
375 pr_notice("temp %d\n", temp);
376
377 *t = temp;
378 return 0;
379 }
380
acerhdf_bind(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev)381 static int acerhdf_bind(struct thermal_zone_device *thermal,
382 struct thermal_cooling_device *cdev)
383 {
384 /* if the cooling device is the one from acerhdf bind it */
385 if (cdev != cl_dev)
386 return 0;
387
388 if (thermal_zone_bind_cooling_device(thermal, 0, cdev,
389 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
390 THERMAL_WEIGHT_DEFAULT)) {
391 pr_err("error binding cooling dev\n");
392 return -EINVAL;
393 }
394 return 0;
395 }
396
acerhdf_unbind(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev)397 static int acerhdf_unbind(struct thermal_zone_device *thermal,
398 struct thermal_cooling_device *cdev)
399 {
400 if (cdev != cl_dev)
401 return 0;
402
403 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
404 pr_err("error unbinding cooling dev\n");
405 return -EINVAL;
406 }
407 return 0;
408 }
409
acerhdf_revert_to_bios_mode(void)410 static inline void acerhdf_revert_to_bios_mode(void)
411 {
412 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
413 kernelmode = 0;
414
415 pr_notice("kernel mode fan control OFF\n");
416 }
acerhdf_enable_kernelmode(void)417 static inline void acerhdf_enable_kernelmode(void)
418 {
419 kernelmode = 1;
420
421 pr_notice("kernel mode fan control ON\n");
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_change_mode(struct thermal_zone_device * thermal,enum thermal_device_mode mode)430 static int acerhdf_change_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_crit_temp(struct thermal_zone_device * thermal,int * temperature)441 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
442 int *temperature)
443 {
444 *temperature = ACERHDF_TEMP_CRIT;
445 return 0;
446 }
447
448 /* bind callback functions to thermalzone */
449 static struct thermal_zone_device_ops acerhdf_dev_ops = {
450 .bind = acerhdf_bind,
451 .unbind = acerhdf_unbind,
452 .get_temp = acerhdf_get_ec_temp,
453 .change_mode = acerhdf_change_mode,
454 .get_crit_temp = acerhdf_get_crit_temp,
455 };
456
457 /*
458 * cooling device callback functions
459 * get maximal fan cooling state
460 */
acerhdf_get_max_state(struct thermal_cooling_device * cdev,unsigned long * state)461 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
462 unsigned long *state)
463 {
464 *state = 1;
465
466 return 0;
467 }
468
acerhdf_get_cur_state(struct thermal_cooling_device * cdev,unsigned long * state)469 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
470 unsigned long *state)
471 {
472 int err = 0, tmp;
473
474 err = acerhdf_get_fanstate(&tmp);
475 if (err)
476 return err;
477
478 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
479 return 0;
480 }
481
482 /* change current fan state - is overwritten when running in kernel mode */
acerhdf_set_cur_state(struct thermal_cooling_device * cdev,unsigned long state)483 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
484 unsigned long state)
485 {
486 int cur_temp, cur_state, err = 0;
487
488 if (!kernelmode)
489 return 0;
490
491 err = acerhdf_get_temp(&cur_temp);
492 if (err) {
493 pr_err("error reading temperature, hand off control to BIOS\n");
494 goto err_out;
495 }
496
497 err = acerhdf_get_fanstate(&cur_state);
498 if (err) {
499 pr_err("error reading fan state, hand off control to BIOS\n");
500 goto err_out;
501 }
502
503 if (state == 0) {
504 if (cur_state == ACERHDF_FAN_AUTO)
505 acerhdf_change_fanstate(ACERHDF_FAN_OFF);
506 } else {
507 if (cur_state == ACERHDF_FAN_OFF)
508 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
509 }
510 return 0;
511
512 err_out:
513 acerhdf_revert_to_bios_mode();
514 return -EINVAL;
515 }
516
517 /* bind fan callbacks to fan device */
518 static const struct thermal_cooling_device_ops acerhdf_cooling_ops = {
519 .get_max_state = acerhdf_get_max_state,
520 .get_cur_state = acerhdf_get_cur_state,
521 .set_cur_state = acerhdf_set_cur_state,
522 };
523
524 /* suspend / resume functionality */
acerhdf_suspend(struct device * dev)525 static int acerhdf_suspend(struct device *dev)
526 {
527 if (kernelmode)
528 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
529
530 if (verbose)
531 pr_notice("going suspend\n");
532
533 return 0;
534 }
535
acerhdf_probe(struct platform_device * device)536 static int acerhdf_probe(struct platform_device *device)
537 {
538 return 0;
539 }
540
541 static const struct dev_pm_ops acerhdf_pm_ops = {
542 .suspend = acerhdf_suspend,
543 .freeze = acerhdf_suspend,
544 };
545
546 static struct platform_driver acerhdf_driver = {
547 .driver = {
548 .name = "acerhdf",
549 .pm = &acerhdf_pm_ops,
550 },
551 .probe = acerhdf_probe,
552 };
553
554 /* check hardware */
acerhdf_check_hardware(void)555 static int __init acerhdf_check_hardware(void)
556 {
557 char const *vendor, *version, *product;
558 const struct bios_settings *bt = NULL;
559 int found = 0;
560
561 /* get BIOS data */
562 vendor = dmi_get_system_info(DMI_SYS_VENDOR);
563 version = dmi_get_system_info(DMI_BIOS_VERSION);
564 product = dmi_get_system_info(DMI_PRODUCT_NAME);
565
566 if (!vendor || !version || !product) {
567 pr_err("error getting hardware information\n");
568 return -EINVAL;
569 }
570
571 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
572
573 if (list_supported) {
574 pr_info("List of supported Manufacturer/Model/BIOS:\n");
575 pr_info("---------------------------------------------------\n");
576 for (bt = bios_tbl; bt->vendor[0]; bt++) {
577 pr_info("%-13s | %-17s | %-10s\n", bt->vendor,
578 bt->product, bt->version);
579 }
580 pr_info("---------------------------------------------------\n");
581 return -ECANCELED;
582 }
583
584 if (force_bios[0]) {
585 version = force_bios;
586 pr_info("forcing BIOS version: %s\n", version);
587 kernelmode = 0;
588 }
589
590 if (force_product[0]) {
591 product = force_product;
592 pr_info("forcing BIOS product: %s\n", product);
593 kernelmode = 0;
594 }
595
596 if (verbose)
597 pr_info("BIOS info: %s %s, product: %s\n",
598 vendor, version, product);
599
600 /* search BIOS version and vendor in BIOS settings table */
601 for (bt = bios_tbl; bt->vendor[0]; bt++) {
602 /*
603 * check if actual hardware BIOS vendor, product and version
604 * IDs start with the strings of BIOS table entry
605 */
606 if (strstarts(vendor, bt->vendor) &&
607 strstarts(product, bt->product) &&
608 strstarts(version, bt->version)) {
609 found = 1;
610 break;
611 }
612 }
613
614 if (!found) {
615 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
616 vendor, product, version);
617 return -EINVAL;
618 }
619
620 /* Copy control settings from BIOS table before we free it. */
621 ctrl_cfg.fanreg = bt->fanreg;
622 ctrl_cfg.tempreg = bt->tempreg;
623 memcpy(&ctrl_cfg.cmd, &bt->cmd, sizeof(struct fancmd));
624 ctrl_cfg.mcmd_enable = bt->mcmd_enable;
625
626 /*
627 * if started with kernel mode off, prevent the kernel from switching
628 * off the fan
629 */
630 if (!kernelmode) {
631 pr_notice("Fan control off, to enable do:\n");
632 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zoneN/mode # N=0,1,2...\n");
633 }
634
635 return 0;
636 }
637
acerhdf_register_platform(void)638 static int __init acerhdf_register_platform(void)
639 {
640 int err = 0;
641
642 err = platform_driver_register(&acerhdf_driver);
643 if (err)
644 return err;
645
646 acerhdf_dev = platform_device_alloc("acerhdf", PLATFORM_DEVID_NONE);
647 if (!acerhdf_dev) {
648 err = -ENOMEM;
649 goto err_device_alloc;
650 }
651 err = platform_device_add(acerhdf_dev);
652 if (err)
653 goto err_device_add;
654
655 return 0;
656
657 err_device_add:
658 platform_device_put(acerhdf_dev);
659 err_device_alloc:
660 platform_driver_unregister(&acerhdf_driver);
661 return err;
662 }
663
acerhdf_unregister_platform(void)664 static void acerhdf_unregister_platform(void)
665 {
666 platform_device_unregister(acerhdf_dev);
667 platform_driver_unregister(&acerhdf_driver);
668 }
669
acerhdf_register_thermal(void)670 static int __init acerhdf_register_thermal(void)
671 {
672 int ret;
673
674 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
675 &acerhdf_cooling_ops);
676
677 if (IS_ERR(cl_dev))
678 return -EINVAL;
679
680 thz_dev = thermal_zone_device_register_with_trips("acerhdf", trips, ARRAY_SIZE(trips),
681 0, NULL, &acerhdf_dev_ops,
682 &acerhdf_zone_params, 0,
683 (kernelmode) ? interval*1000 : 0);
684 if (IS_ERR(thz_dev))
685 return -EINVAL;
686
687 if (kernelmode)
688 ret = thermal_zone_device_enable(thz_dev);
689 else
690 ret = thermal_zone_device_disable(thz_dev);
691 if (ret)
692 return ret;
693
694 return 0;
695 }
696
acerhdf_unregister_thermal(void)697 static void acerhdf_unregister_thermal(void)
698 {
699 if (cl_dev) {
700 thermal_cooling_device_unregister(cl_dev);
701 cl_dev = NULL;
702 }
703
704 if (thz_dev) {
705 thermal_zone_device_unregister(thz_dev);
706 thz_dev = NULL;
707 }
708 }
709
acerhdf_init(void)710 static int __init acerhdf_init(void)
711 {
712 int err = 0;
713
714 err = acerhdf_check_hardware();
715 if (err)
716 goto out_err;
717
718 err = acerhdf_register_platform();
719 if (err)
720 goto out_err;
721
722 err = acerhdf_register_thermal();
723 if (err)
724 goto err_unreg;
725
726 return 0;
727
728 err_unreg:
729 acerhdf_unregister_thermal();
730 acerhdf_unregister_platform();
731
732 out_err:
733 return err;
734 }
735
acerhdf_exit(void)736 static void __exit acerhdf_exit(void)
737 {
738 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
739 acerhdf_unregister_thermal();
740 acerhdf_unregister_platform();
741 }
742
743 MODULE_LICENSE("GPL");
744 MODULE_AUTHOR("Peter Kaestle");
745 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
746 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
747 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
748 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
749 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
750 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:");
751 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
752 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:");
753 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
754 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:");
755 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:");
756 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:");
757 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
758 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*7551:");
759 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:");
760 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
761 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
762 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
763 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
764 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
765 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
766 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
767 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
768 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa*5420*:");
769
770 module_init(acerhdf_init);
771 module_exit(acerhdf_exit);
772
interval_set_uint(const char * val,const struct kernel_param * kp)773 static int interval_set_uint(const char *val, const struct kernel_param *kp)
774 {
775 int ret;
776
777 ret = param_set_uint(val, kp);
778 if (ret)
779 return ret;
780
781 acerhdf_check_param(thz_dev);
782
783 return 0;
784 }
785
786 static const struct kernel_param_ops interval_ops = {
787 .set = interval_set_uint,
788 .get = param_get_uint,
789 };
790
791 module_param_cb(interval, &interval_ops, &interval, 0000);
792 MODULE_PARM_DESC(interval, "Polling interval of temperature check");
793
