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[pohmelfs.git] / drivers / macintosh / therm_adt746x.c
blobc60d025044ee5ba2009b43717fb2273cf3c80c19
1 /*
2 * Device driver for the i2c thermostat found on the iBook G4, Albook G4
3 *
4 * Copyright (C) 2003, 2004 Colin Leroy, Rasmus Rohde, Benjamin Herrenschmidt
5 *
6 * Documentation from 115254175ADT7467_pra.pdf and 3686221171167ADT7460_b.pdf
7 * http://www.onsemi.com/PowerSolutions/product.do?id=ADT7467
8 * http://www.onsemi.com/PowerSolutions/product.do?id=ADT7460
9 *
10 */
11
12 #include <linux/types.h>
13 #include <linux/module.h>
14 #include <linux/errno.h>
15 #include <linux/kernel.h>
16 #include <linux/delay.h>
17 #include <linux/sched.h>
18 #include <linux/i2c.h>
19 #include <linux/slab.h>
20 #include <linux/init.h>
21 #include <linux/spinlock.h>
22 #include <linux/wait.h>
23 #include <linux/suspend.h>
24 #include <linux/kthread.h>
25 #include <linux/moduleparam.h>
26 #include <linux/freezer.h>
27 #include <linux/of_platform.h>
28
29 #include <asm/prom.h>
30 #include <asm/machdep.h>
31 #include <asm/io.h>
32 #include <asm/system.h>
33 #include <asm/sections.h>
34
35 #undef DEBUG
36
37 #define CONFIG_REG 0x40
38 #define MANUAL_MASK 0xe0
39 #define AUTO_MASK 0x20
40 #define INVERT_MASK 0x10
41
42 static u8 TEMP_REG[3] = {0x26, 0x25, 0x27}; /* local, sensor1, sensor2 */
43 static u8 LIMIT_REG[3] = {0x6b, 0x6a, 0x6c}; /* local, sensor1, sensor2 */
44 static u8 MANUAL_MODE[2] = {0x5c, 0x5d};
45 static u8 REM_CONTROL[2] = {0x00, 0x40};
46 static u8 FAN_SPEED[2] = {0x28, 0x2a};
47 static u8 FAN_SPD_SET[2] = {0x30, 0x31};
48
49 static u8 default_limits_local[3] = {70, 50, 70}; /* local, sensor1, sensor2 */
50 static u8 default_limits_chip[3] = {80, 65, 80}; /* local, sensor1, sensor2 */
51 static const char *sensor_location[3];
52
53 static int limit_adjust;
54 static int fan_speed = -1;
55 static bool verbose;
56
57 MODULE_AUTHOR("Colin Leroy <colin@colino.net>");
58 MODULE_DESCRIPTION("Driver for ADT746x thermostat in iBook G4 and "
59 "Powerbook G4 Alu");
60 MODULE_LICENSE("GPL");
61
62 module_param(limit_adjust, int, 0644);
63 MODULE_PARM_DESC(limit_adjust,"Adjust maximum temperatures (50 sensor1, 70 sensor2) "
64 "by N degrees.");
65
66 module_param(fan_speed, int, 0644);
67 MODULE_PARM_DESC(fan_speed,"Specify starting fan speed (0-255) "
68 "(default 64)");
69
70 module_param(verbose, bool, 0);
71 MODULE_PARM_DESC(verbose,"Verbose log operations "
72 "(default 0)");
73
74 struct thermostat {
75 struct i2c_client *clt;
76 u8 temps[3];
77 u8 cached_temp[3];
78 u8 initial_limits[3];
79 u8 limits[3];
80 int last_speed[2];
81 int last_var[2];
82 int pwm_inv[2];
83 };
84
85 static enum {ADT7460, ADT7467} therm_type;
86 static int therm_bus, therm_address;
87 static struct platform_device * of_dev;
88 static struct thermostat* thermostat;
89 static struct task_struct *thread_therm = NULL;
90
91 static void write_both_fan_speed(struct thermostat *th, int speed);
92 static void write_fan_speed(struct thermostat *th, int speed, int fan);
93 static void thermostat_create_files(void);
94 static void thermostat_remove_files(void);
95
96 static int
97 write_reg(struct thermostat* th, int reg, u8 data)
98 {
99 u8 tmp[2];
100 int rc;
101
102 tmp[0] = reg;
103 tmp[1] = data;
104 rc = i2c_master_send(th->clt, (const char *)tmp, 2);
105 if (rc < 0)
106 return rc;
107 if (rc != 2)
108 return -ENODEV;
109 return 0;
110 }
111
112 static int
113 read_reg(struct thermostat* th, int reg)
114 {
115 u8 reg_addr, data;
116 int rc;
117
118 reg_addr = (u8)reg;
119 rc = i2c_master_send(th->clt, &reg_addr, 1);
120 if (rc < 0)
121 return rc;
122 if (rc != 1)
123 return -ENODEV;
124 rc = i2c_master_recv(th->clt, (char *)&data, 1);
125 if (rc < 0)
126 return rc;
127 return data;
128 }
129
130 static struct i2c_driver thermostat_driver;
131
132 static int
133 attach_thermostat(struct i2c_adapter *adapter)
134 {
135 unsigned long bus_no;
136 struct i2c_board_info info;
137 struct i2c_client *client;
138
139 if (strncmp(adapter->name, "uni-n", 5))
140 return -ENODEV;
141 bus_no = simple_strtoul(adapter->name + 6, NULL, 10);
142 if (bus_no != therm_bus)
143 return -ENODEV;
144
145 memset(&info, 0, sizeof(struct i2c_board_info));
146 strlcpy(info.type, "therm_adt746x", I2C_NAME_SIZE);
147 info.addr = therm_address;
148 client = i2c_new_device(adapter, &info);
149 if (!client)
150 return -ENODEV;
151
152 /*
153 * Let i2c-core delete that device on driver removal.
154 * This is safe because i2c-core holds the core_lock mutex for us.
155 */
156 list_add_tail(&client->detected, &thermostat_driver.clients);
157 return 0;
158 }
159
160 static int
161 remove_thermostat(struct i2c_client *client)
162 {
163 struct thermostat *th = i2c_get_clientdata(client);
164 int i;
165
166 thermostat_remove_files();
167
168 if (thread_therm != NULL) {
169 kthread_stop(thread_therm);
170 }
171
172 printk(KERN_INFO "adt746x: Putting max temperatures back from "
173 "%d, %d, %d to %d, %d, %d\n",
174 th->limits[0], th->limits[1], th->limits[2],
175 th->initial_limits[0], th->initial_limits[1],
176 th->initial_limits[2]);
177
178 for (i = 0; i < 3; i++)
179 write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
180
181 write_both_fan_speed(th, -1);
182
183 thermostat = NULL;
184
185 kfree(th);
186
187 return 0;
188 }
189
190 static int read_fan_speed(struct thermostat *th, u8 addr)
191 {
192 u8 tmp[2];
193 u16 res;
194
195 /* should start with low byte */
196 tmp[1] = read_reg(th, addr);
197 tmp[0] = read_reg(th, addr + 1);
198
199 res = tmp[1] + (tmp[0] << 8);
200 /* "a value of 0xffff means that the fan has stopped" */
201 return (res == 0xffff ? 0 : (90000*60)/res);
202 }
203
204 static void write_both_fan_speed(struct thermostat *th, int speed)
205 {
206 write_fan_speed(th, speed, 0);
207 if (therm_type == ADT7460)
208 write_fan_speed(th, speed, 1);
209 }
210
211 static void write_fan_speed(struct thermostat *th, int speed, int fan)
212 {
213 u8 manual;
214
215 if (speed > 0xff)
216 speed = 0xff;
217 else if (speed < -1)
218 speed = 0;
219
220 if (therm_type == ADT7467 && fan == 1)
221 return;
222
223 if (th->last_speed[fan] != speed) {
224 if (verbose) {
225 if (speed == -1)
226 printk(KERN_DEBUG "adt746x: Setting speed to automatic "
227 "for %s fan.\n", sensor_location[fan+1]);
228 else
229 printk(KERN_DEBUG "adt746x: Setting speed to %d "
230 "for %s fan.\n", speed, sensor_location[fan+1]);
231 }
232 } else
233 return;
234
235 if (speed >= 0) {
236 manual = read_reg(th, MANUAL_MODE[fan]);
237 manual &= ~INVERT_MASK;
238 write_reg(th, MANUAL_MODE[fan],
239 manual | MANUAL_MASK | th->pwm_inv[fan]);
240 write_reg(th, FAN_SPD_SET[fan], speed);
241 } else {
242 /* back to automatic */
243 if(therm_type == ADT7460) {
244 manual = read_reg(th,
245 MANUAL_MODE[fan]) & (~MANUAL_MASK);
246 manual &= ~INVERT_MASK;
247 manual |= th->pwm_inv[fan];
248 write_reg(th,
249 MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
250 } else {
251 manual = read_reg(th, MANUAL_MODE[fan]);
252 manual &= ~INVERT_MASK;
253 manual |= th->pwm_inv[fan];
254 write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
255 }
256 }
257
258 th->last_speed[fan] = speed;
259 }
260
261 static void read_sensors(struct thermostat *th)
262 {
263 int i = 0;
264
265 for (i = 0; i < 3; i++)
266 th->temps[i] = read_reg(th, TEMP_REG[i]);
267 }
268
269 #ifdef DEBUG
270 static void display_stats(struct thermostat *th)
271 {
272 if (th->temps[0] != th->cached_temp[0]
273 || th->temps[1] != th->cached_temp[1]
274 || th->temps[2] != th->cached_temp[2]) {
275 printk(KERN_INFO "adt746x: Temperature infos:"
276 " thermostats: %d,%d,%d;"
277 " limits: %d,%d,%d;"
278 " fan speed: %d RPM\n",
279 th->temps[0], th->temps[1], th->temps[2],
280 th->limits[0], th->limits[1], th->limits[2],
281 read_fan_speed(th, FAN_SPEED[0]));
282 }
283 th->cached_temp[0] = th->temps[0];
284 th->cached_temp[1] = th->temps[1];
285 th->cached_temp[2] = th->temps[2];
286 }
287 #endif
288
289 static void update_fans_speed (struct thermostat *th)
290 {
291 int lastvar = 0; /* last variation, for iBook */
292 int i = 0;
293
294 /* we don't care about local sensor, so we start at sensor 1 */
295 for (i = 1; i < 3; i++) {
296 int started = 0;
297 int fan_number = (therm_type == ADT7460 && i == 2);
298 int var = th->temps[i] - th->limits[i];
299
300 if (var > -1) {
301 int step = (255 - fan_speed) / 7;
302 int new_speed = 0;
303
304 /* hysteresis : change fan speed only if variation is
305 * more than two degrees */
306 if (abs(var - th->last_var[fan_number]) < 2)
307 continue;
308
309 started = 1;
310 new_speed = fan_speed + ((var-1)*step);
311
312 if (new_speed < fan_speed)
313 new_speed = fan_speed;
314 if (new_speed > 255)
315 new_speed = 255;
316
317 if (verbose)
318 printk(KERN_DEBUG "adt746x: Setting fans speed to %d "
319 "(limit exceeded by %d on %s)\n",
320 new_speed, var,
321 sensor_location[fan_number+1]);
322 write_both_fan_speed(th, new_speed);
323 th->last_var[fan_number] = var;
324 } else if (var < -2) {
325 /* don't stop fan if sensor2 is cold and sensor1 is not
326 * so cold (lastvar >= -1) */
327 if (i == 2 && lastvar < -1) {
328 if (th->last_speed[fan_number] != 0)
329 if (verbose)
330 printk(KERN_DEBUG "adt746x: Stopping "
331 "fans.\n");
332 write_both_fan_speed(th, 0);
333 }
334 }
335
336 lastvar = var;
337
338 if (started)
339 return; /* we don't want to re-stop the fan
340 * if sensor1 is heating and sensor2 is not */
341 }
342 }
343
344 static int monitor_task(void *arg)
345 {
346 struct thermostat* th = arg;
347
348 set_freezable();
349 while(!kthread_should_stop()) {
350 try_to_freeze();
351 msleep_interruptible(2000);
352
353 #ifndef DEBUG
354 if (fan_speed != -1)
355 read_sensors(th);
356 #else
357 read_sensors(th);
358 #endif
359
360 if (fan_speed != -1)
361 update_fans_speed(th);
362
363 #ifdef DEBUG
364 display_stats(th);
365 #endif
366
367 }
368
369 return 0;
370 }
371
372 static void set_limit(struct thermostat *th, int i)
373 {
374 /* Set sensor1 limit higher to avoid powerdowns */
375 th->limits[i] = default_limits_chip[i] + limit_adjust;
376 write_reg(th, LIMIT_REG[i], th->limits[i]);
377
378 /* set our limits to normal */
379 th->limits[i] = default_limits_local[i] + limit_adjust;
380 }
381
382 static int probe_thermostat(struct i2c_client *client,
383 const struct i2c_device_id *id)
384 {
385 struct thermostat* th;
386 int rc;
387 int i;
388
389 if (thermostat)
390 return 0;
391
392 th = kzalloc(sizeof(struct thermostat), GFP_KERNEL);
393 if (!th)
394 return -ENOMEM;
395
396 i2c_set_clientdata(client, th);
397 th->clt = client;
398
399 rc = read_reg(th, CONFIG_REG);
400 if (rc < 0) {
401 dev_err(&client->dev, "Thermostat failed to read config!\n");
402 kfree(th);
403 return -ENODEV;
404 }
405
406 /* force manual control to start the fan quieter */
407 if (fan_speed == -1)
408 fan_speed = 64;
409
410 if(therm_type == ADT7460) {
411 printk(KERN_INFO "adt746x: ADT7460 initializing\n");
412 /* The 7460 needs to be started explicitly */
413 write_reg(th, CONFIG_REG, 1);
414 } else
415 printk(KERN_INFO "adt746x: ADT7467 initializing\n");
416
417 for (i = 0; i < 3; i++) {
418 th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
419 set_limit(th, i);
420 }
421
422 printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
423 " to %d, %d, %d\n",
424 th->initial_limits[0], th->initial_limits[1],
425 th->initial_limits[2], th->limits[0], th->limits[1],
426 th->limits[2]);
427
428 thermostat = th;
429
430 /* record invert bit status because fw can corrupt it after suspend */
431 th->pwm_inv[0] = read_reg(th, MANUAL_MODE[0]) & INVERT_MASK;
432 th->pwm_inv[1] = read_reg(th, MANUAL_MODE[1]) & INVERT_MASK;
433
434 /* be sure to really write fan speed the first time */
435 th->last_speed[0] = -2;
436 th->last_speed[1] = -2;
437 th->last_var[0] = -80;
438 th->last_var[1] = -80;
439
440 if (fan_speed != -1) {
441 /* manual mode, stop fans */
442 write_both_fan_speed(th, 0);
443 } else {
444 /* automatic mode */
445 write_both_fan_speed(th, -1);
446 }
447
448 thread_therm = kthread_run(monitor_task, th, "kfand");
449
450 if (thread_therm == ERR_PTR(-ENOMEM)) {
451 printk(KERN_INFO "adt746x: Kthread creation failed\n");
452 thread_therm = NULL;
453 return -ENOMEM;
454 }
455
456 thermostat_create_files();
457
458 return 0;
459 }
460
461 static const struct i2c_device_id therm_adt746x_id[] = {
462 { "therm_adt746x", 0 },
463 { }
464 };
465
466 static struct i2c_driver thermostat_driver = {
467 .driver = {
468 .name = "therm_adt746x",
469 },
470 .attach_adapter = attach_thermostat,
471 .probe = probe_thermostat,
472 .remove = remove_thermostat,
473 .id_table = therm_adt746x_id,
474 };
475
476 /*
477 * Now, unfortunately, sysfs doesn't give us a nice void * we could
478 * pass around to the attribute functions, so we don't really have
479 * choice but implement a bunch of them...
480 *
481 * FIXME, it does now...
482 */
483 #define BUILD_SHOW_FUNC_INT(name, data) \
484 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
485 { \
486 return sprintf(buf, "%d\n", data); \
487 }
488
489 #define BUILD_SHOW_FUNC_STR(name, data) \
490 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
491 { \
492 return sprintf(buf, "%s\n", data); \
493 }
494
495 #define BUILD_SHOW_FUNC_FAN(name, data) \
496 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
497 { \
498 return sprintf(buf, "%d (%d rpm)\n", \
499 thermostat->last_speed[data], \
500 read_fan_speed(thermostat, FAN_SPEED[data]) \
501 ); \
502 }
503
504 #define BUILD_STORE_FUNC_DEG(name, data) \
505 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
506 { \
507 int val; \
508 int i; \
509 val = simple_strtol(buf, NULL, 10); \
510 printk(KERN_INFO "Adjusting limits by %d degrees\n", val); \
511 limit_adjust = val; \
512 for (i=0; i < 3; i++) \
513 set_limit(thermostat, i); \
514 return n; \
515 }
516
517 #define BUILD_STORE_FUNC_INT(name, data) \
518 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
519 { \
520 int val; \
521 val = simple_strtol(buf, NULL, 10); \
522 if (val < 0 || val > 255) \
523 return -EINVAL; \
524 printk(KERN_INFO "Setting specified fan speed to %d\n", val); \
525 data = val; \
526 return n; \
527 }
528
529 BUILD_SHOW_FUNC_INT(sensor1_temperature, (read_reg(thermostat, TEMP_REG[1])))
530 BUILD_SHOW_FUNC_INT(sensor2_temperature, (read_reg(thermostat, TEMP_REG[2])))
531 BUILD_SHOW_FUNC_INT(sensor1_limit, thermostat->limits[1])
532 BUILD_SHOW_FUNC_INT(sensor2_limit, thermostat->limits[2])
533 BUILD_SHOW_FUNC_STR(sensor1_location, sensor_location[1])
534 BUILD_SHOW_FUNC_STR(sensor2_location, sensor_location[2])
535
536 BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
537 BUILD_SHOW_FUNC_FAN(sensor1_fan_speed, 0)
538 BUILD_SHOW_FUNC_FAN(sensor2_fan_speed, 1)
539
540 BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
541 BUILD_SHOW_FUNC_INT(limit_adjust, limit_adjust)
542 BUILD_STORE_FUNC_DEG(limit_adjust, thermostat)
543
544 static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
545 show_sensor1_temperature,NULL);
546 static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
547 show_sensor2_temperature,NULL);
548 static DEVICE_ATTR(sensor1_limit, S_IRUGO,
549 show_sensor1_limit, NULL);
550 static DEVICE_ATTR(sensor2_limit, S_IRUGO,
551 show_sensor2_limit, NULL);
552 static DEVICE_ATTR(sensor1_location, S_IRUGO,
553 show_sensor1_location, NULL);
554 static DEVICE_ATTR(sensor2_location, S_IRUGO,
555 show_sensor2_location, NULL);
556
557 static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
558 show_specified_fan_speed,store_specified_fan_speed);
559
560 static DEVICE_ATTR(sensor1_fan_speed, S_IRUGO,
561 show_sensor1_fan_speed, NULL);
562 static DEVICE_ATTR(sensor2_fan_speed, S_IRUGO,
563 show_sensor2_fan_speed, NULL);
564
565 static DEVICE_ATTR(limit_adjust, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
566 show_limit_adjust, store_limit_adjust);
567
568
569 static int __init
570 thermostat_init(void)
571 {
572 struct device_node* np;
573 const u32 *prop;
574 int i = 0, offset = 0;
575
576 np = of_find_node_by_name(NULL, "fan");
577 if (!np)
578 return -ENODEV;
579 if (of_device_is_compatible(np, "adt7460"))
580 therm_type = ADT7460;
581 else if (of_device_is_compatible(np, "adt7467"))
582 therm_type = ADT7467;
583 else {
584 of_node_put(np);
585 return -ENODEV;
586 }
587
588 prop = of_get_property(np, "hwsensor-params-version", NULL);
589 printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
590 (*prop == 1)?"":"un");
591 if (*prop != 1) {
592 of_node_put(np);
593 return -ENODEV;
594 }
595
596 prop = of_get_property(np, "reg", NULL);
597 if (!prop) {
598 of_node_put(np);
599 return -ENODEV;
600 }
601
602 /* look for bus either by path or using "reg" */
603 if (strstr(np->full_name, "/i2c-bus@") != NULL) {
604 const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
605 therm_bus = tmp_bus[0]-'0';
606 } else {
607 therm_bus = ((*prop) >> 8) & 0x0f;
608 }
609
610 therm_address = ((*prop) & 0xff) >> 1;
611
612 printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
613 "limit_adjust: %d, fan_speed: %d\n",
614 therm_bus, therm_address, limit_adjust, fan_speed);
615
616 if (of_get_property(np, "hwsensor-location", NULL)) {
617 for (i = 0; i < 3; i++) {
618 sensor_location[i] = of_get_property(np,
619 "hwsensor-location", NULL) + offset;
620
621 if (sensor_location[i] == NULL)
622 sensor_location[i] = "";
623
624 printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
625 offset += strlen(sensor_location[i]) + 1;
626 }
627 } else {
628 sensor_location[0] = "?";
629 sensor_location[1] = "?";
630 sensor_location[2] = "?";
631 }
632
633 of_dev = of_platform_device_create(np, "temperatures", NULL);
634 of_node_put(np);
635
636 if (of_dev == NULL) {
637 printk(KERN_ERR "Can't register temperatures device !\n");
638 return -ENODEV;
639 }
640
641 #ifndef CONFIG_I2C_POWERMAC
642 request_module("i2c-powermac");
643 #endif
644
645 return i2c_add_driver(&thermostat_driver);
646 }
647
648 static void thermostat_create_files(void)
649 {
650 int err;
651
652 err = device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
653 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
654 err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
655 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
656 err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
657 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
658 err |= device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
659 err |= device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
660 err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
661 if(therm_type == ADT7460)
662 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
663 if (err)
664 printk(KERN_WARNING
665 "Failed to create temperature attribute file(s).\n");
666 }
667
668 static void thermostat_remove_files(void)
669 {
670 if (of_dev) {
671 device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
672 device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
673 device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
674 device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
675 device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
676 device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
677 device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
678 device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
679 device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
680
681 if(therm_type == ADT7460)
682 device_remove_file(&of_dev->dev,
683 &dev_attr_sensor2_fan_speed);
684
685 }
686 }
687
688 static void __exit
689 thermostat_exit(void)
690 {
691 i2c_del_driver(&thermostat_driver);
692 of_device_unregister(of_dev);
693 }
694
695 module_init(thermostat_init);
696 module_exit(thermostat_exit);