tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 Feuerer peter (a) piie.net
8 * http://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_TEMP_CRIT 89000
50#define ACERHDF_FAN_OFF 0
51#define ACERHDF_FAN_AUTO 1
52
53/*
54 * No matter what value the user puts into the fanon variable, turn on the fan
55 * at 80 degree Celsius to prevent hardware damage
56 */
57#define ACERHDF_MAX_FANON 80000
58
59/*
60 * Maximum interval between two temperature checks is 15 seconds, as the die
61 * can get hot really fast under heavy load (plus we shouldn't forget about
62 * possible impact of _external_ aggressive sources such as heaters, sun etc.)
63 */
64#define ACERHDF_MAX_INTERVAL 15
65
66#ifdef START_IN_KERNEL_MODE
67static int kernelmode = 1;
68#else
69static int kernelmode;
70#endif
71
72static unsigned int interval = 10;
73static unsigned int fanon = 60000;
74static unsigned int fanoff = 53000;
75static unsigned int verbose;
76static unsigned int list_supported;
77static unsigned int fanstate = ACERHDF_FAN_AUTO;
78static char force_bios[16];
79static char force_product[16];
80static unsigned int prev_interval;
81static struct thermal_zone_device *thz_dev;
82static struct thermal_cooling_device *cl_dev;
83static struct platform_device *acerhdf_dev;
84
85module_param(kernelmode, uint, 0);
86MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
87module_param(interval, uint, 0600);
88MODULE_PARM_DESC(interval, "Polling interval of temperature check");
89module_param(fanon, uint, 0600);
90MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
91module_param(fanoff, uint, 0600);
92MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
93module_param(verbose, uint, 0600);
94MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
95module_param(list_supported, uint, 0600);
96MODULE_PARM_DESC(list_supported, "List supported models and BIOS versions");
97module_param_string(force_bios, force_bios, 16, 0);
98MODULE_PARM_DESC(force_bios, "Pretend system has this known supported BIOS version");
99module_param_string(force_product, force_product, 16, 0);
100MODULE_PARM_DESC(force_product, "Pretend system is this known supported model");
101
102/*
103 * cmd_off: to switch the fan completely off and check if the fan is off
104 * cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
105 * the fan speed depending on the temperature
106 */
107struct fancmd {
108 u8 cmd_off;
109 u8 cmd_auto;
110};
111
112struct manualcmd {
113 u8 mreg;
114 u8 moff;
115};
116
117/* default register and command to disable fan in manual mode */
118static const struct manualcmd mcmd = {
119 .mreg = 0x94,
120 .moff = 0xff,
121};
122
123/* BIOS settings - only used during probe */
124struct bios_settings {
125 const char *vendor;
126 const char *product;
127 const char *version;
128 u8 fanreg;
129 u8 tempreg;
130 struct fancmd cmd;
131 int mcmd_enable;
132};
133
134/* This could be a daughter struct in the above, but not worth the redirect */
135struct ctrl_settings {
136 u8 fanreg;
137 u8 tempreg;
138 struct fancmd cmd;
139 int mcmd_enable;
140};
141
142static struct ctrl_settings ctrl_cfg __read_mostly;
143
144/* Register addresses and values for different BIOS versions */
145static const struct bios_settings bios_tbl[] __initconst = {
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/*
261 * this struct is used to instruct thermal layer to use bang_bang instead of
262 * default governor for acerhdf
263 */
264static struct thermal_zone_params acerhdf_zone_params = {
265 .governor_name = "bang_bang",
266};
267
268static int acerhdf_get_temp(int *temp)
269{
270 u8 read_temp;
271
272 if (ec_read(ctrl_cfg.tempreg, &read_temp))
273 return -EINVAL;
274
275 *temp = read_temp * 1000;
276
277 return 0;
278}
279
280static int acerhdf_get_fanstate(int *state)
281{
282 u8 fan;
283
284 if (ec_read(ctrl_cfg.fanreg, &fan))
285 return -EINVAL;
286
287 if (fan != ctrl_cfg.cmd.cmd_off)
288 *state = ACERHDF_FAN_AUTO;
289 else
290 *state = ACERHDF_FAN_OFF;
291
292 return 0;
293}
294
295static void acerhdf_change_fanstate(int state)
296{
297 unsigned char cmd;
298
299 if (verbose)
300 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON");
301
302 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
303 pr_err("invalid fan state %d requested, setting to auto!\n",
304 state);
305 state = ACERHDF_FAN_AUTO;
306 }
307
308 cmd = (state == ACERHDF_FAN_OFF) ? ctrl_cfg.cmd.cmd_off
309 : ctrl_cfg.cmd.cmd_auto;
310 fanstate = state;
311
312 ec_write(ctrl_cfg.fanreg, cmd);
313
314 if (ctrl_cfg.mcmd_enable && state == ACERHDF_FAN_OFF) {
315 if (verbose)
316 pr_notice("turning off fan manually\n");
317 ec_write(mcmd.mreg, mcmd.moff);
318 }
319}
320
321static void acerhdf_check_param(struct thermal_zone_device *thermal)
322{
323 if (fanon > ACERHDF_MAX_FANON) {
324 pr_err("fanon temperature too high, set to %d\n",
325 ACERHDF_MAX_FANON);
326 fanon = ACERHDF_MAX_FANON;
327 }
328
329 if (kernelmode && prev_interval != interval) {
330 if (interval > ACERHDF_MAX_INTERVAL) {
331 pr_err("interval too high, set to %d\n",
332 ACERHDF_MAX_INTERVAL);
333 interval = ACERHDF_MAX_INTERVAL;
334 }
335 if (verbose)
336 pr_notice("interval changed to: %d\n", interval);
337 thermal->polling_delay = interval*1000;
338 prev_interval = interval;
339 }
340}
341
342/*
343 * This is the thermal zone callback which does the delayed polling of the fan
344 * state. We do check /sysfs-originating settings here in acerhdf_check_param()
345 * as late as the polling interval is since we can't do that in the respective
346 * accessors of the module parameters.
347 */
348static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t)
349{
350 int temp, err = 0;
351
352 acerhdf_check_param(thermal);
353
354 err = acerhdf_get_temp(&temp);
355 if (err)
356 return err;
357
358 if (verbose)
359 pr_notice("temp %d\n", temp);
360
361 *t = temp;
362 return 0;
363}
364
365static int acerhdf_bind(struct thermal_zone_device *thermal,
366 struct thermal_cooling_device *cdev)
367{
368 /* if the cooling device is the one from acerhdf bind it */
369 if (cdev != cl_dev)
370 return 0;
371
372 if (thermal_zone_bind_cooling_device(thermal, 0, cdev,
373 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
374 THERMAL_WEIGHT_DEFAULT)) {
375 pr_err("error binding cooling dev\n");
376 return -EINVAL;
377 }
378 return 0;
379}
380
381static int acerhdf_unbind(struct thermal_zone_device *thermal,
382 struct thermal_cooling_device *cdev)
383{
384 if (cdev != cl_dev)
385 return 0;
386
387 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
388 pr_err("error unbinding cooling dev\n");
389 return -EINVAL;
390 }
391 return 0;
392}
393
394static inline void acerhdf_revert_to_bios_mode(void)
395{
396 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
397 kernelmode = 0;
398 if (thz_dev)
399 thz_dev->polling_delay = 0;
400 pr_notice("kernel mode fan control OFF\n");
401}
402static inline void acerhdf_enable_kernelmode(void)
403{
404 kernelmode = 1;
405
406 thz_dev->polling_delay = interval*1000;
407 thermal_zone_device_update(thz_dev, THERMAL_EVENT_UNSPECIFIED);
408 pr_notice("kernel mode fan control ON\n");
409}
410
411static int acerhdf_get_mode(struct thermal_zone_device *thermal,
412 enum thermal_device_mode *mode)
413{
414 if (verbose)
415 pr_notice("kernel mode fan control %d\n", kernelmode);
416
417 *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
418 : THERMAL_DEVICE_DISABLED;
419
420 return 0;
421}
422
423/*
424 * set operation mode;
425 * enabled: the thermal layer of the kernel takes care about
426 * the temperature and the fan.
427 * disabled: the BIOS takes control of the fan.
428 */
429static int acerhdf_set_mode(struct thermal_zone_device *thermal,
430 enum thermal_device_mode mode)
431{
432 if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
433 acerhdf_revert_to_bios_mode();
434 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
435 acerhdf_enable_kernelmode();
436
437 return 0;
438}
439
440static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
441 enum thermal_trip_type *type)
442{
443 if (trip == 0)
444 *type = THERMAL_TRIP_ACTIVE;
445 else if (trip == 1)
446 *type = THERMAL_TRIP_CRITICAL;
447 else
448 return -EINVAL;
449
450 return 0;
451}
452
453static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip,
454 int *temp)
455{
456 if (trip != 0)
457 return -EINVAL;
458
459 *temp = fanon - fanoff;
460
461 return 0;
462}
463
464static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
465 int *temp)
466{
467 if (trip == 0)
468 *temp = fanon;
469 else if (trip == 1)
470 *temp = ACERHDF_TEMP_CRIT;
471 else
472 return -EINVAL;
473
474 return 0;
475}
476
477static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
478 int *temperature)
479{
480 *temperature = ACERHDF_TEMP_CRIT;
481 return 0;
482}
483
484/* bind callback functions to thermalzone */
485static struct thermal_zone_device_ops acerhdf_dev_ops = {
486 .bind = acerhdf_bind,
487 .unbind = acerhdf_unbind,
488 .get_temp = acerhdf_get_ec_temp,
489 .get_mode = acerhdf_get_mode,
490 .set_mode = acerhdf_set_mode,
491 .get_trip_type = acerhdf_get_trip_type,
492 .get_trip_hyst = acerhdf_get_trip_hyst,
493 .get_trip_temp = acerhdf_get_trip_temp,
494 .get_crit_temp = acerhdf_get_crit_temp,
495};
496
497
498/*
499 * cooling device callback functions
500 * get maximal fan cooling state
501 */
502static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
503 unsigned long *state)
504{
505 *state = 1;
506
507 return 0;
508}
509
510static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
511 unsigned long *state)
512{
513 int err = 0, tmp;
514
515 err = acerhdf_get_fanstate(&tmp);
516 if (err)
517 return err;
518
519 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
520 return 0;
521}
522
523/* change current fan state - is overwritten when running in kernel mode */
524static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
525 unsigned long state)
526{
527 int cur_temp, cur_state, err = 0;
528
529 if (!kernelmode)
530 return 0;
531
532 err = acerhdf_get_temp(&cur_temp);
533 if (err) {
534 pr_err("error reading temperature, hand off control to BIOS\n");
535 goto err_out;
536 }
537
538 err = acerhdf_get_fanstate(&cur_state);
539 if (err) {
540 pr_err("error reading fan state, hand off control to BIOS\n");
541 goto err_out;
542 }
543
544 if (state == 0) {
545 if (cur_state == ACERHDF_FAN_AUTO)
546 acerhdf_change_fanstate(ACERHDF_FAN_OFF);
547 } else {
548 if (cur_state == ACERHDF_FAN_OFF)
549 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
550 }
551 return 0;
552
553err_out:
554 acerhdf_revert_to_bios_mode();
555 return -EINVAL;
556}
557
558/* bind fan callbacks to fan device */
559static const struct thermal_cooling_device_ops acerhdf_cooling_ops = {
560 .get_max_state = acerhdf_get_max_state,
561 .get_cur_state = acerhdf_get_cur_state,
562 .set_cur_state = acerhdf_set_cur_state,
563};
564
565/* suspend / resume functionality */
566static int acerhdf_suspend(struct device *dev)
567{
568 if (kernelmode)
569 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
570
571 if (verbose)
572 pr_notice("going suspend\n");
573
574 return 0;
575}
576
577static int acerhdf_probe(struct platform_device *device)
578{
579 return 0;
580}
581
582static int acerhdf_remove(struct platform_device *device)
583{
584 return 0;
585}
586
587static const struct dev_pm_ops acerhdf_pm_ops = {
588 .suspend = acerhdf_suspend,
589 .freeze = acerhdf_suspend,
590};
591
592static struct platform_driver acerhdf_driver = {
593 .driver = {
594 .name = "acerhdf",
595 .pm = &acerhdf_pm_ops,
596 },
597 .probe = acerhdf_probe,
598 .remove = acerhdf_remove,
599};
600
601/* checks if str begins with start */
602static int str_starts_with(const char *str, const char *start)
603{
604 unsigned long str_len = 0, start_len = 0;
605
606 str_len = strlen(str);
607 start_len = strlen(start);
608
609 if (str_len >= start_len &&
610 !strncmp(str, start, start_len))
611 return 1;
612
613 return 0;
614}
615
616/* check hardware */
617static int __init acerhdf_check_hardware(void)
618{
619 char const *vendor, *version, *product;
620 const struct bios_settings *bt = NULL;
621 int found = 0;
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 (list_supported) {
636 pr_info("List of supported Manufacturer/Model/BIOS:\n");
637 pr_info("---------------------------------------------------\n");
638 for (bt = bios_tbl; bt->vendor[0]; bt++) {
639 pr_info("%-13s | %-17s | %-10s\n", bt->vendor,
640 bt->product, bt->version);
641 }
642 pr_info("---------------------------------------------------\n");
643 return -ECANCELED;
644 }
645
646 if (force_bios[0]) {
647 version = force_bios;
648 pr_info("forcing BIOS version: %s\n", version);
649 kernelmode = 0;
650 }
651
652 if (force_product[0]) {
653 product = force_product;
654 pr_info("forcing BIOS product: %s\n", product);
655 kernelmode = 0;
656 }
657
658 if (verbose)
659 pr_info("BIOS info: %s %s, product: %s\n",
660 vendor, version, product);
661
662 /* search BIOS version and vendor in BIOS settings table */
663 for (bt = bios_tbl; bt->vendor[0]; bt++) {
664 /*
665 * check if actual hardware BIOS vendor, product and version
666 * IDs start with the strings of BIOS table entry
667 */
668 if (str_starts_with(vendor, bt->vendor) &&
669 str_starts_with(product, bt->product) &&
670 str_starts_with(version, bt->version)) {
671 found = 1;
672 break;
673 }
674 }
675
676 if (!found) {
677 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
678 vendor, product, version);
679 return -EINVAL;
680 }
681
682 /* Copy control settings from BIOS table before we free it. */
683 ctrl_cfg.fanreg = bt->fanreg;
684 ctrl_cfg.tempreg = bt->tempreg;
685 memcpy(&ctrl_cfg.cmd, &bt->cmd, sizeof(struct fancmd));
686 ctrl_cfg.mcmd_enable = bt->mcmd_enable;
687
688 /*
689 * if started with kernel mode off, prevent the kernel from switching
690 * off the fan
691 */
692 if (!kernelmode) {
693 pr_notice("Fan control off, to enable do:\n");
694 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zoneN/mode # N=0,1,2...\n");
695 }
696
697 return 0;
698}
699
700static int __init acerhdf_register_platform(void)
701{
702 int err = 0;
703
704 err = platform_driver_register(&acerhdf_driver);
705 if (err)
706 return err;
707
708 acerhdf_dev = platform_device_alloc("acerhdf", -1);
709 if (!acerhdf_dev) {
710 err = -ENOMEM;
711 goto err_device_alloc;
712 }
713 err = platform_device_add(acerhdf_dev);
714 if (err)
715 goto err_device_add;
716
717 return 0;
718
719err_device_add:
720 platform_device_put(acerhdf_dev);
721err_device_alloc:
722 platform_driver_unregister(&acerhdf_driver);
723 return err;
724}
725
726static void acerhdf_unregister_platform(void)
727{
728 platform_device_unregister(acerhdf_dev);
729 platform_driver_unregister(&acerhdf_driver);
730}
731
732static int __init acerhdf_register_thermal(void)
733{
734 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
735 &acerhdf_cooling_ops);
736
737 if (IS_ERR(cl_dev))
738 return -EINVAL;
739
740 thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL,
741 &acerhdf_dev_ops,
742 &acerhdf_zone_params, 0,
743 (kernelmode) ? interval*1000 : 0);
744 if (IS_ERR(thz_dev))
745 return -EINVAL;
746
747 if (strcmp(thz_dev->governor->name,
748 acerhdf_zone_params.governor_name)) {
749 pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
750 acerhdf_zone_params.governor_name);
751 return -EINVAL;
752 }
753
754 return 0;
755}
756
757static void acerhdf_unregister_thermal(void)
758{
759 if (cl_dev) {
760 thermal_cooling_device_unregister(cl_dev);
761 cl_dev = NULL;
762 }
763
764 if (thz_dev) {
765 thermal_zone_device_unregister(thz_dev);
766 thz_dev = NULL;
767 }
768}
769
770static int __init acerhdf_init(void)
771{
772 int err = 0;
773
774 err = acerhdf_check_hardware();
775 if (err)
776 goto out_err;
777
778 err = acerhdf_register_platform();
779 if (err)
780 goto out_err;
781
782 err = acerhdf_register_thermal();
783 if (err)
784 goto err_unreg;
785
786 return 0;
787
788err_unreg:
789 acerhdf_unregister_thermal();
790 acerhdf_unregister_platform();
791
792out_err:
793 return err;
794}
795
796static void __exit acerhdf_exit(void)
797{
798 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
799 acerhdf_unregister_thermal();
800 acerhdf_unregister_platform();
801}
802
803MODULE_LICENSE("GPL");
804MODULE_AUTHOR("Peter Feuerer");
805MODULE_DESCRIPTION("Aspire One temperature and fan driver");
806MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
807MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
808MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
809MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
810MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:");
811MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
812MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:");
813MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
814MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:");
815MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:");
816MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:");
817MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
818MODULE_ALIAS("dmi:*:*Acer*:TM8573T:");
819MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
820MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
821MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
822MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
823MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
824MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
825MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
826MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
827MODULE_ALIAS("dmi:*:*Acer*:pnExtensa 5420*:");
828
829module_init(acerhdf_init);
830module_exit(acerhdf_exit);