Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/platform/x86/acerhdf.c

  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 "0.5.26"
 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 /* BIOS settings */
123 struct bios_settings_t {
124         const char *vendor;
125         const char *product;
126         const char *version;
127         unsigned char fanreg;
128         unsigned char tempreg;
129         struct fancmd cmd;
130 };
131 
132 /* Register addresses and values for different BIOS versions */
133 static const struct bios_settings_t bios_tbl[] = {
134         /* AOA110 */
135         {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00} },
136         {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00} },
137         {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00} },
138         {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00} },
139         {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00} },
140         {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00} },
141         {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00} },
142         {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00} },
143         {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00} },
144         /* AOA150 */
145         {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00} },
146         {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00} },
147         {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00} },
148         {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00} },
149         {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00} },
150         {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00} },
151         {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00} },
152         {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00} },
153         /* LT1005u */
154         {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00} },
155         /* Acer 1410 */
156         {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
157         {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
158         {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
159         {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
160         {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
161         {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
162         {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
163         {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
164         {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
165         {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
166         {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00} },
167         /* Acer 1810xx */
168         {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
169         {"Acer", "Aspire 1810T",  "v0.3108", 0x55, 0x58, {0x9e, 0x00} },
170         {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
171         {"Acer", "Aspire 1810T",  "v0.3113", 0x55, 0x58, {0x9e, 0x00} },
172         {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
173         {"Acer", "Aspire 1810T",  "v0.3115", 0x55, 0x58, {0x9e, 0x00} },
174         {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
175         {"Acer", "Aspire 1810T",  "v0.3117", 0x55, 0x58, {0x9e, 0x00} },
176         {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
177         {"Acer", "Aspire 1810T",  "v0.3119", 0x55, 0x58, {0x9e, 0x00} },
178         {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
179         {"Acer", "Aspire 1810T",  "v0.3120", 0x55, 0x58, {0x9e, 0x00} },
180         {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
181         {"Acer", "Aspire 1810T",  "v1.3204", 0x55, 0x58, {0x9e, 0x00} },
182         {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
183         {"Acer", "Aspire 1810T",  "v1.3303", 0x55, 0x58, {0x9e, 0x00} },
184         {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
185         {"Acer", "Aspire 1810T",  "v1.3308", 0x55, 0x58, {0x9e, 0x00} },
186         {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
187         {"Acer", "Aspire 1810T",  "v1.3310", 0x55, 0x58, {0x9e, 0x00} },
188         {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00} },
189         {"Acer", "Aspire 1810T",  "v1.3314", 0x55, 0x58, {0x9e, 0x00} },
190         /* Acer 531 */
191         {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00} },
192         {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00} },
193         {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00} },
194         /* Acer 751 */
195         {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00} },
196         /* Acer 1825 */
197         {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00} },
198         {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00} },
199         /* Acer TravelMate 7730 */
200         {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00} },
201         /* Gateway */
202         {"Gateway", "AOA110", "v0.3103",  0x55, 0x58, {0x21, 0x00} },
203         {"Gateway", "AOA150", "v0.3103",  0x55, 0x58, {0x20, 0x00} },
204         {"Gateway", "LT31",   "v1.3103",  0x55, 0x58, {0x9e, 0x00} },
205         {"Gateway", "LT31",   "v1.3201",  0x55, 0x58, {0x9e, 0x00} },
206         {"Gateway", "LT31",   "v1.3302",  0x55, 0x58, {0x9e, 0x00} },
207         {"Gateway", "LT31",   "v1.3303t", 0x55, 0x58, {0x9e, 0x00} },
208         /* Packard Bell */
209         {"Packard Bell", "DOA150",  "v0.3104",  0x55, 0x58, {0x21, 0x00} },
210         {"Packard Bell", "DOA150",  "v0.3105",  0x55, 0x58, {0x20, 0x00} },
211         {"Packard Bell", "AOA110",  "v0.3105",  0x55, 0x58, {0x21, 0x00} },
212         {"Packard Bell", "AOA150",  "v0.3105",  0x55, 0x58, {0x20, 0x00} },
213         {"Packard Bell", "ENBFT",   "V1.3118",  0x55, 0x58, {0x9e, 0x00} },
214         {"Packard Bell", "ENBFT",   "V1.3127",  0x55, 0x58, {0x9e, 0x00} },
215         {"Packard Bell", "DOTMU",   "v1.3303",  0x55, 0x58, {0x9e, 0x00} },
216         {"Packard Bell", "DOTMU",   "v0.3120",  0x55, 0x58, {0x9e, 0x00} },
217         {"Packard Bell", "DOTMU",   "v0.3108",  0x55, 0x58, {0x9e, 0x00} },
218         {"Packard Bell", "DOTMU",   "v0.3113",  0x55, 0x58, {0x9e, 0x00} },
219         {"Packard Bell", "DOTMU",   "v0.3115",  0x55, 0x58, {0x9e, 0x00} },
220         {"Packard Bell", "DOTMU",   "v0.3117",  0x55, 0x58, {0x9e, 0x00} },
221         {"Packard Bell", "DOTMU",   "v0.3119",  0x55, 0x58, {0x9e, 0x00} },
222         {"Packard Bell", "DOTMU",   "v1.3204",  0x55, 0x58, {0x9e, 0x00} },
223         {"Packard Bell", "DOTMA",   "v1.3201",  0x55, 0x58, {0x9e, 0x00} },
224         {"Packard Bell", "DOTMA",   "v1.3302",  0x55, 0x58, {0x9e, 0x00} },
225         {"Packard Bell", "DOTMA",   "v1.3303t", 0x55, 0x58, {0x9e, 0x00} },
226         {"Packard Bell", "DOTVR46", "v1.3308",  0x55, 0x58, {0x9e, 0x00} },
227         /* pewpew-terminator */
228         {"", "", "", 0, 0, {0, 0} }
229 };
230 
231 static const struct bios_settings_t *bios_cfg __read_mostly;
232 
233 static int acerhdf_get_temp(int *temp)
234 {
235         u8 read_temp;
236 
237         if (ec_read(bios_cfg->tempreg, &read_temp))
238                 return -EINVAL;
239 
240         *temp = read_temp * 1000;
241 
242         return 0;
243 }
244 
245 static int acerhdf_get_fanstate(int *state)
246 {
247         u8 fan;
248 
249         if (ec_read(bios_cfg->fanreg, &fan))
250                 return -EINVAL;
251 
252         if (fan != bios_cfg->cmd.cmd_off)
253                 *state = ACERHDF_FAN_AUTO;
254         else
255                 *state = ACERHDF_FAN_OFF;
256 
257         return 0;
258 }
259 
260 static void acerhdf_change_fanstate(int state)
261 {
262         unsigned char cmd;
263 
264         if (verbose)
265                 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON");
266 
267         if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
268                 pr_err("invalid fan state %d requested, setting to auto!\n",
269                        state);
270                 state = ACERHDF_FAN_AUTO;
271         }
272 
273         cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off
274                                          : bios_cfg->cmd.cmd_auto;
275         fanstate = state;
276 
277         ec_write(bios_cfg->fanreg, cmd);
278 }
279 
280 static void acerhdf_check_param(struct thermal_zone_device *thermal)
281 {
282         if (fanon > ACERHDF_MAX_FANON) {
283                 pr_err("fanon temperature too high, set to %d\n",
284                        ACERHDF_MAX_FANON);
285                 fanon = ACERHDF_MAX_FANON;
286         }
287 
288         if (kernelmode && prev_interval != interval) {
289                 if (interval > ACERHDF_MAX_INTERVAL) {
290                         pr_err("interval too high, set to %d\n",
291                                ACERHDF_MAX_INTERVAL);
292                         interval = ACERHDF_MAX_INTERVAL;
293                 }
294                 if (verbose)
295                         pr_notice("interval changed to: %d\n", interval);
296                 thermal->polling_delay = interval*1000;
297                 prev_interval = interval;
298         }
299 }
300 
301 /*
302  * This is the thermal zone callback which does the delayed polling of the fan
303  * state. We do check /sysfs-originating settings here in acerhdf_check_param()
304  * as late as the polling interval is since we can't do that in the respective
305  * accessors of the module parameters.
306  */
307 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
308                                unsigned long *t)
309 {
310         int temp, err = 0;
311 
312         acerhdf_check_param(thermal);
313 
314         err = acerhdf_get_temp(&temp);
315         if (err)
316                 return err;
317 
318         if (verbose)
319                 pr_notice("temp %d\n", temp);
320 
321         *t = temp;
322         return 0;
323 }
324 
325 static int acerhdf_bind(struct thermal_zone_device *thermal,
326                         struct thermal_cooling_device *cdev)
327 {
328         /* if the cooling device is the one from acerhdf bind it */
329         if (cdev != cl_dev)
330                 return 0;
331 
332         if (thermal_zone_bind_cooling_device(thermal, 0, cdev,
333                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT)) {
334                 pr_err("error binding cooling dev\n");
335                 return -EINVAL;
336         }
337         return 0;
338 }
339 
340 static int acerhdf_unbind(struct thermal_zone_device *thermal,
341                           struct thermal_cooling_device *cdev)
342 {
343         if (cdev != cl_dev)
344                 return 0;
345 
346         if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
347                 pr_err("error unbinding cooling dev\n");
348                 return -EINVAL;
349         }
350         return 0;
351 }
352 
353 static inline void acerhdf_revert_to_bios_mode(void)
354 {
355         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
356         kernelmode = 0;
357         if (thz_dev)
358                 thz_dev->polling_delay = 0;
359         pr_notice("kernel mode fan control OFF\n");
360 }
361 static inline void acerhdf_enable_kernelmode(void)
362 {
363         kernelmode = 1;
364 
365         thz_dev->polling_delay = interval*1000;
366         thermal_zone_device_update(thz_dev);
367         pr_notice("kernel mode fan control ON\n");
368 }
369 
370 static int acerhdf_get_mode(struct thermal_zone_device *thermal,
371                             enum thermal_device_mode *mode)
372 {
373         if (verbose)
374                 pr_notice("kernel mode fan control %d\n", kernelmode);
375 
376         *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
377                              : THERMAL_DEVICE_DISABLED;
378 
379         return 0;
380 }
381 
382 /*
383  * set operation mode;
384  * enabled: the thermal layer of the kernel takes care about
385  *          the temperature and the fan.
386  * disabled: the BIOS takes control of the fan.
387  */
388 static int acerhdf_set_mode(struct thermal_zone_device *thermal,
389                             enum thermal_device_mode mode)
390 {
391         if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
392                 acerhdf_revert_to_bios_mode();
393         else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
394                 acerhdf_enable_kernelmode();
395 
396         return 0;
397 }
398 
399 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
400                                  enum thermal_trip_type *type)
401 {
402         if (trip == 0)
403                 *type = THERMAL_TRIP_ACTIVE;
404 
405         return 0;
406 }
407 
408 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
409                                  unsigned long *temp)
410 {
411         if (trip == 0)
412                 *temp = fanon;
413 
414         return 0;
415 }
416 
417 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
418                                  unsigned long *temperature)
419 {
420         *temperature = ACERHDF_TEMP_CRIT;
421         return 0;
422 }
423 
424 /* bind callback functions to thermalzone */
425 static struct thermal_zone_device_ops acerhdf_dev_ops = {
426         .bind = acerhdf_bind,
427         .unbind = acerhdf_unbind,
428         .get_temp = acerhdf_get_ec_temp,
429         .get_mode = acerhdf_get_mode,
430         .set_mode = acerhdf_set_mode,
431         .get_trip_type = acerhdf_get_trip_type,
432         .get_trip_temp = acerhdf_get_trip_temp,
433         .get_crit_temp = acerhdf_get_crit_temp,
434 };
435 
436 
437 /*
438  * cooling device callback functions
439  * get maximal fan cooling state
440  */
441 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
442                                  unsigned long *state)
443 {
444         *state = 1;
445 
446         return 0;
447 }
448 
449 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
450                                  unsigned long *state)
451 {
452         int err = 0, tmp;
453 
454         err = acerhdf_get_fanstate(&tmp);
455         if (err)
456                 return err;
457 
458         *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
459         return 0;
460 }
461 
462 /* change current fan state - is overwritten when running in kernel mode */
463 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
464                                  unsigned long state)
465 {
466         int cur_temp, cur_state, err = 0;
467 
468         if (!kernelmode)
469                 return 0;
470 
471         err = acerhdf_get_temp(&cur_temp);
472         if (err) {
473                 pr_err("error reading temperature, hand off control to BIOS\n");
474                 goto err_out;
475         }
476 
477         err = acerhdf_get_fanstate(&cur_state);
478         if (err) {
479                 pr_err("error reading fan state, hand off control to BIOS\n");
480                 goto err_out;
481         }
482 
483         if (state == 0) {
484                 /* turn fan off only if below fanoff temperature */
485                 if ((cur_state == ACERHDF_FAN_AUTO) &&
486                     (cur_temp < fanoff))
487                         acerhdf_change_fanstate(ACERHDF_FAN_OFF);
488         } else {
489                 if (cur_state == ACERHDF_FAN_OFF)
490                         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
491         }
492         return 0;
493 
494 err_out:
495         acerhdf_revert_to_bios_mode();
496         return -EINVAL;
497 }
498 
499 /* bind fan callbacks to fan device */
500 static struct thermal_cooling_device_ops acerhdf_cooling_ops = {
501         .get_max_state = acerhdf_get_max_state,
502         .get_cur_state = acerhdf_get_cur_state,
503         .set_cur_state = acerhdf_set_cur_state,
504 };
505 
506 /* suspend / resume functionality */
507 static int acerhdf_suspend(struct device *dev)
508 {
509         if (kernelmode)
510                 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
511 
512         if (verbose)
513                 pr_notice("going suspend\n");
514 
515         return 0;
516 }
517 
518 static int acerhdf_probe(struct platform_device *device)
519 {
520         return 0;
521 }
522 
523 static int acerhdf_remove(struct platform_device *device)
524 {
525         return 0;
526 }
527 
528 static const struct dev_pm_ops acerhdf_pm_ops = {
529         .suspend = acerhdf_suspend,
530         .freeze  = acerhdf_suspend,
531 };
532 
533 static struct platform_driver acerhdf_driver = {
534         .driver = {
535                 .name  = "acerhdf",
536                 .owner = THIS_MODULE,
537                 .pm    = &acerhdf_pm_ops,
538         },
539         .probe = acerhdf_probe,
540         .remove = acerhdf_remove,
541 };
542 
543 /* checks if str begins with start */
544 static int str_starts_with(const char *str, const char *start)
545 {
546         unsigned long str_len = 0, start_len = 0;
547 
548         str_len = strlen(str);
549         start_len = strlen(start);
550 
551         if (str_len >= start_len &&
552                         !strncmp(str, start, start_len))
553                 return 1;
554 
555         return 0;
556 }
557 
558 /* check hardware */
559 static int acerhdf_check_hardware(void)
560 {
561         char const *vendor, *version, *product;
562         const struct bios_settings_t *bt = NULL;
563 
564         /* get BIOS data */
565         vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
566         version = dmi_get_system_info(DMI_BIOS_VERSION);
567         product = dmi_get_system_info(DMI_PRODUCT_NAME);
568 
569         if (!vendor || !version || !product) {
570                 pr_err("error getting hardware information\n");
571                 return -EINVAL;
572         }
573 
574         pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
575 
576         if (force_bios[0]) {
577                 version = force_bios;
578                 pr_info("forcing BIOS version: %s\n", version);
579                 kernelmode = 0;
580         }
581 
582         if (force_product[0]) {
583                 product = force_product;
584                 pr_info("forcing BIOS product: %s\n", product);
585                 kernelmode = 0;
586         }
587 
588         if (verbose)
589                 pr_info("BIOS info: %s %s, product: %s\n",
590                         vendor, version, product);
591 
592         /* search BIOS version and vendor in BIOS settings table */
593         for (bt = bios_tbl; bt->vendor[0]; bt++) {
594                 /*
595                  * check if actual hardware BIOS vendor, product and version
596                  * IDs start with the strings of BIOS table entry
597                  */
598                 if (str_starts_with(vendor, bt->vendor) &&
599                                 str_starts_with(product, bt->product) &&
600                                 str_starts_with(version, bt->version)) {
601                         bios_cfg = bt;
602                         break;
603                 }
604         }
605 
606         if (!bios_cfg) {
607                 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
608                        vendor, product, version);
609                 return -EINVAL;
610         }
611 
612         /*
613          * if started with kernel mode off, prevent the kernel from switching
614          * off the fan
615          */
616         if (!kernelmode) {
617                 pr_notice("Fan control off, to enable do:\n");
618                 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zone0/mode\n");
619         }
620 
621         return 0;
622 }
623 
624 static int acerhdf_register_platform(void)
625 {
626         int err = 0;
627 
628         err = platform_driver_register(&acerhdf_driver);
629         if (err)
630                 return err;
631 
632         acerhdf_dev = platform_device_alloc("acerhdf", -1);
633         if (!acerhdf_dev) {
634                 err = -ENOMEM;
635                 goto err_device_alloc;
636         }
637         err = platform_device_add(acerhdf_dev);
638         if (err)
639                 goto err_device_add;
640 
641         return 0;
642 
643 err_device_add:
644         platform_device_put(acerhdf_dev);
645 err_device_alloc:
646         platform_driver_unregister(&acerhdf_driver);
647         return err;
648 }
649 
650 static void acerhdf_unregister_platform(void)
651 {
652         platform_device_unregister(acerhdf_dev);
653         platform_driver_unregister(&acerhdf_driver);
654 }
655 
656 static int acerhdf_register_thermal(void)
657 {
658         cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
659                                                  &acerhdf_cooling_ops);
660 
661         if (IS_ERR(cl_dev))
662                 return -EINVAL;
663 
664         thz_dev = thermal_zone_device_register("acerhdf", 1, 0, NULL,
665                                               &acerhdf_dev_ops, NULL, 0,
666                                               (kernelmode) ? interval*1000 : 0);
667         if (IS_ERR(thz_dev))
668                 return -EINVAL;
669 
670         return 0;
671 }
672 
673 static void acerhdf_unregister_thermal(void)
674 {
675         if (cl_dev) {
676                 thermal_cooling_device_unregister(cl_dev);
677                 cl_dev = NULL;
678         }
679 
680         if (thz_dev) {
681                 thermal_zone_device_unregister(thz_dev);
682                 thz_dev = NULL;
683         }
684 }
685 
686 static int __init acerhdf_init(void)
687 {
688         int err = 0;
689 
690         err = acerhdf_check_hardware();
691         if (err)
692                 goto out_err;
693 
694         err = acerhdf_register_platform();
695         if (err)
696                 goto out_err;
697 
698         err = acerhdf_register_thermal();
699         if (err)
700                 goto err_unreg;
701 
702         return 0;
703 
704 err_unreg:
705         acerhdf_unregister_thermal();
706         acerhdf_unregister_platform();
707 
708 out_err:
709         return err;
710 }
711 
712 static void __exit acerhdf_exit(void)
713 {
714         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
715         acerhdf_unregister_thermal();
716         acerhdf_unregister_platform();
717 }
718 
719 MODULE_LICENSE("GPL");
720 MODULE_AUTHOR("Peter Feuerer");
721 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
722 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
723 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
724 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
725 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
726 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
727 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
728 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
729 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
730 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
731 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
732 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
733 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
734 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
735 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
736 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
737 
738 module_init(acerhdf_init);
739 module_exit(acerhdf_exit);
740 

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