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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 "0.7.0"
 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 
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 
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 
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 
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  */
349 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
350                                unsigned long *t)
351 {
352         int temp, err = 0;
353 
354         acerhdf_check_param(thermal);
355 
356         err = acerhdf_get_temp(&temp);
357         if (err)
358                 return err;
359 
360         if (verbose)
361                 pr_notice("temp %d\n", temp);
362 
363         *t = temp;
364         return 0;
365 }
366 
367 static int acerhdf_bind(struct thermal_zone_device *thermal,
368                         struct thermal_cooling_device *cdev)
369 {
370         /* if the cooling device is the one from acerhdf bind it */
371         if (cdev != cl_dev)
372                 return 0;
373 
374         if (thermal_zone_bind_cooling_device(thermal, 0, cdev,
375                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
376                         THERMAL_WEIGHT_DEFAULT)) {
377                 pr_err("error binding cooling dev\n");
378                 return -EINVAL;
379         }
380         return 0;
381 }
382 
383 static int acerhdf_unbind(struct thermal_zone_device *thermal,
384                           struct thermal_cooling_device *cdev)
385 {
386         if (cdev != cl_dev)
387                 return 0;
388 
389         if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
390                 pr_err("error unbinding cooling dev\n");
391                 return -EINVAL;
392         }
393         return 0;
394 }
395 
396 static inline void acerhdf_revert_to_bios_mode(void)
397 {
398         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
399         kernelmode = 0;
400         if (thz_dev)
401                 thz_dev->polling_delay = 0;
402         pr_notice("kernel mode fan control OFF\n");
403 }
404 static inline void acerhdf_enable_kernelmode(void)
405 {
406         kernelmode = 1;
407 
408         thz_dev->polling_delay = interval*1000;
409         thermal_zone_device_update(thz_dev);
410         pr_notice("kernel mode fan control ON\n");
411 }
412 
413 static int acerhdf_get_mode(struct thermal_zone_device *thermal,
414                             enum thermal_device_mode *mode)
415 {
416         if (verbose)
417                 pr_notice("kernel mode fan control %d\n", kernelmode);
418 
419         *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
420                              : THERMAL_DEVICE_DISABLED;
421 
422         return 0;
423 }
424 
425 /*
426  * set operation mode;
427  * enabled: the thermal layer of the kernel takes care about
428  *          the temperature and the fan.
429  * disabled: the BIOS takes control of the fan.
430  */
431 static int acerhdf_set_mode(struct thermal_zone_device *thermal,
432                             enum thermal_device_mode mode)
433 {
434         if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
435                 acerhdf_revert_to_bios_mode();
436         else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
437                 acerhdf_enable_kernelmode();
438 
439         return 0;
440 }
441 
442 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
443                                  enum thermal_trip_type *type)
444 {
445         if (trip == 0)
446                 *type = THERMAL_TRIP_ACTIVE;
447         else if (trip == 1)
448                 *type = THERMAL_TRIP_CRITICAL;
449         else
450                 return -EINVAL;
451 
452         return 0;
453 }
454 
455 static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip,
456                                  unsigned long *temp)
457 {
458         if (trip != 0)
459                 return -EINVAL;
460 
461         *temp = fanon - fanoff;
462 
463         return 0;
464 }
465 
466 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
467                                  unsigned long *temp)
468 {
469         if (trip == 0)
470                 *temp = fanon;
471         else if (trip == 1)
472                 *temp = ACERHDF_TEMP_CRIT;
473         else
474                 return -EINVAL;
475 
476         return 0;
477 }
478 
479 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
480                                  unsigned long *temperature)
481 {
482         *temperature = ACERHDF_TEMP_CRIT;
483         return 0;
484 }
485 
486 /* bind callback functions to thermalzone */
487 static struct thermal_zone_device_ops acerhdf_dev_ops = {
488         .bind = acerhdf_bind,
489         .unbind = acerhdf_unbind,
490         .get_temp = acerhdf_get_ec_temp,
491         .get_mode = acerhdf_get_mode,
492         .set_mode = acerhdf_set_mode,
493         .get_trip_type = acerhdf_get_trip_type,
494         .get_trip_hyst = acerhdf_get_trip_hyst,
495         .get_trip_temp = acerhdf_get_trip_temp,
496         .get_crit_temp = acerhdf_get_crit_temp,
497 };
498 
499 
500 /*
501  * cooling device callback functions
502  * get maximal fan cooling state
503  */
504 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
505                                  unsigned long *state)
506 {
507         *state = 1;
508 
509         return 0;
510 }
511 
512 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
513                                  unsigned long *state)
514 {
515         int err = 0, tmp;
516 
517         err = acerhdf_get_fanstate(&tmp);
518         if (err)
519                 return err;
520 
521         *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
522         return 0;
523 }
524 
525 /* change current fan state - is overwritten when running in kernel mode */
526 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
527                                  unsigned long state)
528 {
529         int cur_temp, cur_state, err = 0;
530 
531         if (!kernelmode)
532                 return 0;
533 
534         err = acerhdf_get_temp(&cur_temp);
535         if (err) {
536                 pr_err("error reading temperature, hand off control to BIOS\n");
537                 goto err_out;
538         }
539 
540         err = acerhdf_get_fanstate(&cur_state);
541         if (err) {
542                 pr_err("error reading fan state, hand off control to BIOS\n");
543                 goto err_out;
544         }
545 
546         if (state == 0) {
547                 if (cur_state == ACERHDF_FAN_AUTO)
548                         acerhdf_change_fanstate(ACERHDF_FAN_OFF);
549         } else {
550                 if (cur_state == ACERHDF_FAN_OFF)
551                         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
552         }
553         return 0;
554 
555 err_out:
556         acerhdf_revert_to_bios_mode();
557         return -EINVAL;
558 }
559 
560 /* bind fan callbacks to fan device */
561 static struct thermal_cooling_device_ops acerhdf_cooling_ops = {
562         .get_max_state = acerhdf_get_max_state,
563         .get_cur_state = acerhdf_get_cur_state,
564         .set_cur_state = acerhdf_set_cur_state,
565 };
566 
567 /* suspend / resume functionality */
568 static int acerhdf_suspend(struct device *dev)
569 {
570         if (kernelmode)
571                 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
572 
573         if (verbose)
574                 pr_notice("going suspend\n");
575 
576         return 0;
577 }
578 
579 static int acerhdf_probe(struct platform_device *device)
580 {
581         return 0;
582 }
583 
584 static int acerhdf_remove(struct platform_device *device)
585 {
586         return 0;
587 }
588 
589 static const struct dev_pm_ops acerhdf_pm_ops = {
590         .suspend = acerhdf_suspend,
591         .freeze  = acerhdf_suspend,
592 };
593 
594 static struct platform_driver acerhdf_driver = {
595         .driver = {
596                 .name  = "acerhdf",
597                 .pm    = &acerhdf_pm_ops,
598         },
599         .probe = acerhdf_probe,
600         .remove = acerhdf_remove,
601 };
602 
603 /* checks if str begins with start */
604 static int str_starts_with(const char *str, const char *start)
605 {
606         unsigned long str_len = 0, start_len = 0;
607 
608         str_len = strlen(str);
609         start_len = strlen(start);
610 
611         if (str_len >= start_len &&
612                         !strncmp(str, start, start_len))
613                 return 1;
614 
615         return 0;
616 }
617 
618 /* check hardware */
619 static int acerhdf_check_hardware(void)
620 {
621         char const *vendor, *version, *product;
622         const struct bios_settings *bt = NULL;
623 
624         /* get BIOS data */
625         vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
626         version = dmi_get_system_info(DMI_BIOS_VERSION);
627         product = dmi_get_system_info(DMI_PRODUCT_NAME);
628 
629         if (!vendor || !version || !product) {
630                 pr_err("error getting hardware information\n");
631                 return -EINVAL;
632         }
633 
634         pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
635 
636         if (force_bios[0]) {
637                 version = force_bios;
638                 pr_info("forcing BIOS version: %s\n", version);
639                 kernelmode = 0;
640         }
641 
642         if (force_product[0]) {
643                 product = force_product;
644                 pr_info("forcing BIOS product: %s\n", product);
645                 kernelmode = 0;
646         }
647 
648         if (verbose)
649                 pr_info("BIOS info: %s %s, product: %s\n",
650                         vendor, version, product);
651 
652         /* search BIOS version and vendor in BIOS settings table */
653         for (bt = bios_tbl; bt->vendor[0]; bt++) {
654                 /*
655                  * check if actual hardware BIOS vendor, product and version
656                  * IDs start with the strings of BIOS table entry
657                  */
658                 if (str_starts_with(vendor, bt->vendor) &&
659                                 str_starts_with(product, bt->product) &&
660                                 str_starts_with(version, bt->version)) {
661                         bios_cfg = bt;
662                         break;
663                 }
664         }
665 
666         if (!bios_cfg) {
667                 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
668                        vendor, product, version);
669                 return -EINVAL;
670         }
671 
672         /*
673          * if started with kernel mode off, prevent the kernel from switching
674          * off the fan
675          */
676         if (!kernelmode) {
677                 pr_notice("Fan control off, to enable do:\n");
678                 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zone0/mode\n");
679         }
680 
681         return 0;
682 }
683 
684 static int acerhdf_register_platform(void)
685 {
686         int err = 0;
687 
688         err = platform_driver_register(&acerhdf_driver);
689         if (err)
690                 return err;
691 
692         acerhdf_dev = platform_device_alloc("acerhdf", -1);
693         if (!acerhdf_dev) {
694                 err = -ENOMEM;
695                 goto err_device_alloc;
696         }
697         err = platform_device_add(acerhdf_dev);
698         if (err)
699                 goto err_device_add;
700 
701         return 0;
702 
703 err_device_add:
704         platform_device_put(acerhdf_dev);
705 err_device_alloc:
706         platform_driver_unregister(&acerhdf_driver);
707         return err;
708 }
709 
710 static void acerhdf_unregister_platform(void)
711 {
712         platform_device_unregister(acerhdf_dev);
713         platform_driver_unregister(&acerhdf_driver);
714 }
715 
716 static int acerhdf_register_thermal(void)
717 {
718         cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
719                                                  &acerhdf_cooling_ops);
720 
721         if (IS_ERR(cl_dev))
722                 return -EINVAL;
723 
724         thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL,
725                                               &acerhdf_dev_ops,
726                                               &acerhdf_zone_params, 0,
727                                               (kernelmode) ? interval*1000 : 0);
728         if (IS_ERR(thz_dev))
729                 return -EINVAL;
730 
731         if (strcmp(thz_dev->governor->name,
732                                 acerhdf_zone_params.governor_name)) {
733                 pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
734                                 acerhdf_zone_params.governor_name);
735                 return -EINVAL;
736         }
737 
738         return 0;
739 }
740 
741 static void acerhdf_unregister_thermal(void)
742 {
743         if (cl_dev) {
744                 thermal_cooling_device_unregister(cl_dev);
745                 cl_dev = NULL;
746         }
747 
748         if (thz_dev) {
749                 thermal_zone_device_unregister(thz_dev);
750                 thz_dev = NULL;
751         }
752 }
753 
754 static int __init acerhdf_init(void)
755 {
756         int err = 0;
757 
758         err = acerhdf_check_hardware();
759         if (err)
760                 goto out_err;
761 
762         err = acerhdf_register_platform();
763         if (err)
764                 goto out_err;
765 
766         err = acerhdf_register_thermal();
767         if (err)
768                 goto err_unreg;
769 
770         return 0;
771 
772 err_unreg:
773         acerhdf_unregister_thermal();
774         acerhdf_unregister_platform();
775 
776 out_err:
777         return err;
778 }
779 
780 static void __exit acerhdf_exit(void)
781 {
782         acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
783         acerhdf_unregister_thermal();
784         acerhdf_unregister_platform();
785 }
786 
787 MODULE_LICENSE("GPL");
788 MODULE_AUTHOR("Peter Feuerer");
789 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
790 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
791 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
792 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
793 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
794 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:");
795 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
796 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:");
797 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
798 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:");
799 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:");
800 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:");
801 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
802 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:");
803 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
804 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
805 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
806 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
807 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
808 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
809 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
810 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
811 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa 5420*:");
812 
813 module_init(acerhdf_init);
814 module_exit(acerhdf_exit);
815 

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