Root/
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/sections.h> |
33 | |
34 | #undef DEBUG |
35 | |
36 | #define CONFIG_REG 0x40 |
37 | #define MANUAL_MASK 0xe0 |
38 | #define AUTO_MASK 0x20 |
39 | #define INVERT_MASK 0x10 |
40 | |
41 | static u8 TEMP_REG[3] = {0x26, 0x25, 0x27}; /* local, sensor1, sensor2 */ |
42 | static u8 LIMIT_REG[3] = {0x6b, 0x6a, 0x6c}; /* local, sensor1, sensor2 */ |
43 | static u8 MANUAL_MODE[2] = {0x5c, 0x5d}; |
44 | static u8 REM_CONTROL[2] = {0x00, 0x40}; |
45 | static u8 FAN_SPEED[2] = {0x28, 0x2a}; |
46 | static u8 FAN_SPD_SET[2] = {0x30, 0x31}; |
47 | |
48 | static u8 default_limits_local[3] = {70, 50, 70}; /* local, sensor1, sensor2 */ |
49 | static u8 default_limits_chip[3] = {80, 65, 80}; /* local, sensor1, sensor2 */ |
50 | static const char *sensor_location[3] = { "?", "?", "?" }; |
51 | |
52 | static int limit_adjust; |
53 | static int fan_speed = -1; |
54 | static bool verbose; |
55 | |
56 | MODULE_AUTHOR("Colin Leroy <colin@colino.net>"); |
57 | MODULE_DESCRIPTION("Driver for ADT746x thermostat in iBook G4 and " |
58 | "Powerbook G4 Alu"); |
59 | MODULE_LICENSE("GPL"); |
60 | |
61 | module_param(limit_adjust, int, 0644); |
62 | MODULE_PARM_DESC(limit_adjust,"Adjust maximum temperatures (50 sensor1, 70 sensor2) " |
63 | "by N degrees."); |
64 | |
65 | module_param(fan_speed, int, 0644); |
66 | MODULE_PARM_DESC(fan_speed,"Specify starting fan speed (0-255) " |
67 | "(default 64)"); |
68 | |
69 | module_param(verbose, bool, 0); |
70 | MODULE_PARM_DESC(verbose,"Verbose log operations " |
71 | "(default 0)"); |
72 | |
73 | struct thermostat { |
74 | struct i2c_client *clt; |
75 | u8 temps[3]; |
76 | u8 cached_temp[3]; |
77 | u8 initial_limits[3]; |
78 | u8 limits[3]; |
79 | int last_speed[2]; |
80 | int last_var[2]; |
81 | int pwm_inv[2]; |
82 | struct task_struct *thread; |
83 | struct platform_device *pdev; |
84 | enum { |
85 | ADT7460, |
86 | ADT7467 |
87 | } type; |
88 | }; |
89 | |
90 | static void write_both_fan_speed(struct thermostat *th, int speed); |
91 | static void write_fan_speed(struct thermostat *th, int speed, int fan); |
92 | |
93 | static int |
94 | write_reg(struct thermostat* th, int reg, u8 data) |
95 | { |
96 | u8 tmp[2]; |
97 | int rc; |
98 | |
99 | tmp[0] = reg; |
100 | tmp[1] = data; |
101 | rc = i2c_master_send(th->clt, (const char *)tmp, 2); |
102 | if (rc < 0) |
103 | return rc; |
104 | if (rc != 2) |
105 | return -ENODEV; |
106 | return 0; |
107 | } |
108 | |
109 | static int |
110 | read_reg(struct thermostat* th, int reg) |
111 | { |
112 | u8 reg_addr, data; |
113 | int rc; |
114 | |
115 | reg_addr = (u8)reg; |
116 | rc = i2c_master_send(th->clt, ®_addr, 1); |
117 | if (rc < 0) |
118 | return rc; |
119 | if (rc != 1) |
120 | return -ENODEV; |
121 | rc = i2c_master_recv(th->clt, (char *)&data, 1); |
122 | if (rc < 0) |
123 | return rc; |
124 | return data; |
125 | } |
126 | |
127 | static int read_fan_speed(struct thermostat *th, u8 addr) |
128 | { |
129 | u8 tmp[2]; |
130 | u16 res; |
131 | |
132 | /* should start with low byte */ |
133 | tmp[1] = read_reg(th, addr); |
134 | tmp[0] = read_reg(th, addr + 1); |
135 | |
136 | res = tmp[1] + (tmp[0] << 8); |
137 | /* "a value of 0xffff means that the fan has stopped" */ |
138 | return (res == 0xffff ? 0 : (90000*60)/res); |
139 | } |
140 | |
141 | static void write_both_fan_speed(struct thermostat *th, int speed) |
142 | { |
143 | write_fan_speed(th, speed, 0); |
144 | if (th->type == ADT7460) |
145 | write_fan_speed(th, speed, 1); |
146 | } |
147 | |
148 | static void write_fan_speed(struct thermostat *th, int speed, int fan) |
149 | { |
150 | u8 manual; |
151 | |
152 | if (speed > 0xff) |
153 | speed = 0xff; |
154 | else if (speed < -1) |
155 | speed = 0; |
156 | |
157 | if (th->type == ADT7467 && fan == 1) |
158 | return; |
159 | |
160 | if (th->last_speed[fan] != speed) { |
161 | if (verbose) { |
162 | if (speed == -1) |
163 | printk(KERN_DEBUG "adt746x: Setting speed to automatic " |
164 | "for %s fan.\n", sensor_location[fan+1]); |
165 | else |
166 | printk(KERN_DEBUG "adt746x: Setting speed to %d " |
167 | "for %s fan.\n", speed, sensor_location[fan+1]); |
168 | } |
169 | } else |
170 | return; |
171 | |
172 | if (speed >= 0) { |
173 | manual = read_reg(th, MANUAL_MODE[fan]); |
174 | manual &= ~INVERT_MASK; |
175 | write_reg(th, MANUAL_MODE[fan], |
176 | manual | MANUAL_MASK | th->pwm_inv[fan]); |
177 | write_reg(th, FAN_SPD_SET[fan], speed); |
178 | } else { |
179 | /* back to automatic */ |
180 | if(th->type == ADT7460) { |
181 | manual = read_reg(th, |
182 | MANUAL_MODE[fan]) & (~MANUAL_MASK); |
183 | manual &= ~INVERT_MASK; |
184 | manual |= th->pwm_inv[fan]; |
185 | write_reg(th, |
186 | MANUAL_MODE[fan], manual|REM_CONTROL[fan]); |
187 | } else { |
188 | manual = read_reg(th, MANUAL_MODE[fan]); |
189 | manual &= ~INVERT_MASK; |
190 | manual |= th->pwm_inv[fan]; |
191 | write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK)); |
192 | } |
193 | } |
194 | |
195 | th->last_speed[fan] = speed; |
196 | } |
197 | |
198 | static void read_sensors(struct thermostat *th) |
199 | { |
200 | int i = 0; |
201 | |
202 | for (i = 0; i < 3; i++) |
203 | th->temps[i] = read_reg(th, TEMP_REG[i]); |
204 | } |
205 | |
206 | #ifdef DEBUG |
207 | static void display_stats(struct thermostat *th) |
208 | { |
209 | if (th->temps[0] != th->cached_temp[0] |
210 | || th->temps[1] != th->cached_temp[1] |
211 | || th->temps[2] != th->cached_temp[2]) { |
212 | printk(KERN_INFO "adt746x: Temperature infos:" |
213 | " thermostats: %d,%d,%d;" |
214 | " limits: %d,%d,%d;" |
215 | " fan speed: %d RPM\n", |
216 | th->temps[0], th->temps[1], th->temps[2], |
217 | th->limits[0], th->limits[1], th->limits[2], |
218 | read_fan_speed(th, FAN_SPEED[0])); |
219 | } |
220 | th->cached_temp[0] = th->temps[0]; |
221 | th->cached_temp[1] = th->temps[1]; |
222 | th->cached_temp[2] = th->temps[2]; |
223 | } |
224 | #endif |
225 | |
226 | static void update_fans_speed (struct thermostat *th) |
227 | { |
228 | int lastvar = 0; /* last variation, for iBook */ |
229 | int i = 0; |
230 | |
231 | /* we don't care about local sensor, so we start at sensor 1 */ |
232 | for (i = 1; i < 3; i++) { |
233 | int started = 0; |
234 | int fan_number = (th->type == ADT7460 && i == 2); |
235 | int var = th->temps[i] - th->limits[i]; |
236 | |
237 | if (var > -1) { |
238 | int step = (255 - fan_speed) / 7; |
239 | int new_speed = 0; |
240 | |
241 | /* hysteresis : change fan speed only if variation is |
242 | * more than two degrees */ |
243 | if (abs(var - th->last_var[fan_number]) < 2) |
244 | continue; |
245 | |
246 | started = 1; |
247 | new_speed = fan_speed + ((var-1)*step); |
248 | |
249 | if (new_speed < fan_speed) |
250 | new_speed = fan_speed; |
251 | if (new_speed > 255) |
252 | new_speed = 255; |
253 | |
254 | if (verbose) |
255 | printk(KERN_DEBUG "adt746x: Setting fans speed to %d " |
256 | "(limit exceeded by %d on %s)\n", |
257 | new_speed, var, |
258 | sensor_location[fan_number+1]); |
259 | write_both_fan_speed(th, new_speed); |
260 | th->last_var[fan_number] = var; |
261 | } else if (var < -2) { |
262 | /* don't stop fan if sensor2 is cold and sensor1 is not |
263 | * so cold (lastvar >= -1) */ |
264 | if (i == 2 && lastvar < -1) { |
265 | if (th->last_speed[fan_number] != 0) |
266 | if (verbose) |
267 | printk(KERN_DEBUG "adt746x: Stopping " |
268 | "fans.\n"); |
269 | write_both_fan_speed(th, 0); |
270 | } |
271 | } |
272 | |
273 | lastvar = var; |
274 | |
275 | if (started) |
276 | return; /* we don't want to re-stop the fan |
277 | * if sensor1 is heating and sensor2 is not */ |
278 | } |
279 | } |
280 | |
281 | static int monitor_task(void *arg) |
282 | { |
283 | struct thermostat* th = arg; |
284 | |
285 | set_freezable(); |
286 | while(!kthread_should_stop()) { |
287 | try_to_freeze(); |
288 | msleep_interruptible(2000); |
289 | |
290 | #ifndef DEBUG |
291 | if (fan_speed != -1) |
292 | read_sensors(th); |
293 | #else |
294 | read_sensors(th); |
295 | #endif |
296 | |
297 | if (fan_speed != -1) |
298 | update_fans_speed(th); |
299 | |
300 | #ifdef DEBUG |
301 | display_stats(th); |
302 | #endif |
303 | |
304 | } |
305 | |
306 | return 0; |
307 | } |
308 | |
309 | static void set_limit(struct thermostat *th, int i) |
310 | { |
311 | /* Set sensor1 limit higher to avoid powerdowns */ |
312 | th->limits[i] = default_limits_chip[i] + limit_adjust; |
313 | write_reg(th, LIMIT_REG[i], th->limits[i]); |
314 | |
315 | /* set our limits to normal */ |
316 | th->limits[i] = default_limits_local[i] + limit_adjust; |
317 | } |
318 | |
319 | #define BUILD_SHOW_FUNC_INT(name, data) \ |
320 | static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ |
321 | { \ |
322 | struct thermostat *th = dev_get_drvdata(dev); \ |
323 | return sprintf(buf, "%d\n", data); \ |
324 | } |
325 | |
326 | #define BUILD_SHOW_FUNC_INT_LITE(name, data) \ |
327 | static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ |
328 | { \ |
329 | return sprintf(buf, "%d\n", data); \ |
330 | } |
331 | |
332 | #define BUILD_SHOW_FUNC_STR(name, data) \ |
333 | static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ |
334 | { \ |
335 | return sprintf(buf, "%s\n", data); \ |
336 | } |
337 | |
338 | #define BUILD_SHOW_FUNC_FAN(name, data) \ |
339 | static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ |
340 | { \ |
341 | struct thermostat *th = dev_get_drvdata(dev); \ |
342 | return sprintf(buf, "%d (%d rpm)\n", \ |
343 | th->last_speed[data], \ |
344 | read_fan_speed(th, FAN_SPEED[data]) \ |
345 | ); \ |
346 | } |
347 | |
348 | #define BUILD_STORE_FUNC_DEG(name, data) \ |
349 | static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \ |
350 | { \ |
351 | struct thermostat *th = dev_get_drvdata(dev); \ |
352 | int val; \ |
353 | int i; \ |
354 | val = simple_strtol(buf, NULL, 10); \ |
355 | printk(KERN_INFO "Adjusting limits by %d degrees\n", val); \ |
356 | limit_adjust = val; \ |
357 | for (i=0; i < 3; i++) \ |
358 | set_limit(th, i); \ |
359 | return n; \ |
360 | } |
361 | |
362 | #define BUILD_STORE_FUNC_INT(name, data) \ |
363 | static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \ |
364 | { \ |
365 | int val; \ |
366 | val = simple_strtol(buf, NULL, 10); \ |
367 | if (val < 0 || val > 255) \ |
368 | return -EINVAL; \ |
369 | printk(KERN_INFO "Setting specified fan speed to %d\n", val); \ |
370 | data = val; \ |
371 | return n; \ |
372 | } |
373 | |
374 | BUILD_SHOW_FUNC_INT(sensor1_temperature, (read_reg(th, TEMP_REG[1]))) |
375 | BUILD_SHOW_FUNC_INT(sensor2_temperature, (read_reg(th, TEMP_REG[2]))) |
376 | BUILD_SHOW_FUNC_INT(sensor1_limit, th->limits[1]) |
377 | BUILD_SHOW_FUNC_INT(sensor2_limit, th->limits[2]) |
378 | BUILD_SHOW_FUNC_STR(sensor1_location, sensor_location[1]) |
379 | BUILD_SHOW_FUNC_STR(sensor2_location, sensor_location[2]) |
380 | |
381 | BUILD_SHOW_FUNC_INT_LITE(specified_fan_speed, fan_speed) |
382 | BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed) |
383 | |
384 | BUILD_SHOW_FUNC_FAN(sensor1_fan_speed, 0) |
385 | BUILD_SHOW_FUNC_FAN(sensor2_fan_speed, 1) |
386 | |
387 | BUILD_SHOW_FUNC_INT_LITE(limit_adjust, limit_adjust) |
388 | BUILD_STORE_FUNC_DEG(limit_adjust, th) |
389 | |
390 | static DEVICE_ATTR(sensor1_temperature, S_IRUGO, |
391 | show_sensor1_temperature,NULL); |
392 | static DEVICE_ATTR(sensor2_temperature, S_IRUGO, |
393 | show_sensor2_temperature,NULL); |
394 | static DEVICE_ATTR(sensor1_limit, S_IRUGO, |
395 | show_sensor1_limit, NULL); |
396 | static DEVICE_ATTR(sensor2_limit, S_IRUGO, |
397 | show_sensor2_limit, NULL); |
398 | static DEVICE_ATTR(sensor1_location, S_IRUGO, |
399 | show_sensor1_location, NULL); |
400 | static DEVICE_ATTR(sensor2_location, S_IRUGO, |
401 | show_sensor2_location, NULL); |
402 | |
403 | static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, |
404 | show_specified_fan_speed,store_specified_fan_speed); |
405 | |
406 | static DEVICE_ATTR(sensor1_fan_speed, S_IRUGO, |
407 | show_sensor1_fan_speed, NULL); |
408 | static DEVICE_ATTR(sensor2_fan_speed, S_IRUGO, |
409 | show_sensor2_fan_speed, NULL); |
410 | |
411 | static DEVICE_ATTR(limit_adjust, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, |
412 | show_limit_adjust, store_limit_adjust); |
413 | |
414 | static void thermostat_create_files(struct thermostat *th) |
415 | { |
416 | struct device_node *np = th->clt->dev.of_node; |
417 | struct device *dev; |
418 | int err; |
419 | |
420 | /* To maintain ABI compatibility with userspace, create |
421 | * the old style platform driver and attach the attributes |
422 | * to it here |
423 | */ |
424 | th->pdev = of_platform_device_create(np, "temperatures", NULL); |
425 | if (!th->pdev) |
426 | return; |
427 | dev = &th->pdev->dev; |
428 | dev_set_drvdata(dev, th); |
429 | err = device_create_file(dev, &dev_attr_sensor1_temperature); |
430 | err |= device_create_file(dev, &dev_attr_sensor2_temperature); |
431 | err |= device_create_file(dev, &dev_attr_sensor1_limit); |
432 | err |= device_create_file(dev, &dev_attr_sensor2_limit); |
433 | err |= device_create_file(dev, &dev_attr_sensor1_location); |
434 | err |= device_create_file(dev, &dev_attr_sensor2_location); |
435 | err |= device_create_file(dev, &dev_attr_limit_adjust); |
436 | err |= device_create_file(dev, &dev_attr_specified_fan_speed); |
437 | err |= device_create_file(dev, &dev_attr_sensor1_fan_speed); |
438 | if(th->type == ADT7460) |
439 | err |= device_create_file(dev, &dev_attr_sensor2_fan_speed); |
440 | if (err) |
441 | printk(KERN_WARNING |
442 | "Failed to create temperature attribute file(s).\n"); |
443 | } |
444 | |
445 | static void thermostat_remove_files(struct thermostat *th) |
446 | { |
447 | struct device *dev; |
448 | |
449 | if (!th->pdev) |
450 | return; |
451 | dev = &th->pdev->dev; |
452 | device_remove_file(dev, &dev_attr_sensor1_temperature); |
453 | device_remove_file(dev, &dev_attr_sensor2_temperature); |
454 | device_remove_file(dev, &dev_attr_sensor1_limit); |
455 | device_remove_file(dev, &dev_attr_sensor2_limit); |
456 | device_remove_file(dev, &dev_attr_sensor1_location); |
457 | device_remove_file(dev, &dev_attr_sensor2_location); |
458 | device_remove_file(dev, &dev_attr_limit_adjust); |
459 | device_remove_file(dev, &dev_attr_specified_fan_speed); |
460 | device_remove_file(dev, &dev_attr_sensor1_fan_speed); |
461 | if (th->type == ADT7460) |
462 | device_remove_file(dev, &dev_attr_sensor2_fan_speed); |
463 | of_device_unregister(th->pdev); |
464 | |
465 | } |
466 | |
467 | static int probe_thermostat(struct i2c_client *client, |
468 | const struct i2c_device_id *id) |
469 | { |
470 | struct device_node *np = client->dev.of_node; |
471 | struct thermostat* th; |
472 | const __be32 *prop; |
473 | int i, rc, vers, offset = 0; |
474 | |
475 | if (!np) |
476 | return -ENXIO; |
477 | prop = of_get_property(np, "hwsensor-params-version", NULL); |
478 | if (!prop) |
479 | return -ENXIO; |
480 | vers = be32_to_cpup(prop); |
481 | printk(KERN_INFO "adt746x: version %d (%ssupported)\n", |
482 | vers, vers == 1 ? "" : "un"); |
483 | if (vers != 1) |
484 | return -ENXIO; |
485 | |
486 | if (of_get_property(np, "hwsensor-location", NULL)) { |
487 | for (i = 0; i < 3; i++) { |
488 | sensor_location[i] = of_get_property(np, |
489 | "hwsensor-location", NULL) + offset; |
490 | |
491 | if (sensor_location[i] == NULL) |
492 | sensor_location[i] = ""; |
493 | |
494 | printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]); |
495 | offset += strlen(sensor_location[i]) + 1; |
496 | } |
497 | } |
498 | |
499 | th = kzalloc(sizeof(struct thermostat), GFP_KERNEL); |
500 | if (!th) |
501 | return -ENOMEM; |
502 | |
503 | i2c_set_clientdata(client, th); |
504 | th->clt = client; |
505 | th->type = id->driver_data; |
506 | |
507 | rc = read_reg(th, CONFIG_REG); |
508 | if (rc < 0) { |
509 | dev_err(&client->dev, "Thermostat failed to read config!\n"); |
510 | kfree(th); |
511 | return -ENODEV; |
512 | } |
513 | |
514 | /* force manual control to start the fan quieter */ |
515 | if (fan_speed == -1) |
516 | fan_speed = 64; |
517 | |
518 | if (th->type == ADT7460) { |
519 | printk(KERN_INFO "adt746x: ADT7460 initializing\n"); |
520 | /* The 7460 needs to be started explicitly */ |
521 | write_reg(th, CONFIG_REG, 1); |
522 | } else |
523 | printk(KERN_INFO "adt746x: ADT7467 initializing\n"); |
524 | |
525 | for (i = 0; i < 3; i++) { |
526 | th->initial_limits[i] = read_reg(th, LIMIT_REG[i]); |
527 | set_limit(th, i); |
528 | } |
529 | |
530 | printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d" |
531 | " to %d, %d, %d\n", |
532 | th->initial_limits[0], th->initial_limits[1], |
533 | th->initial_limits[2], th->limits[0], th->limits[1], |
534 | th->limits[2]); |
535 | |
536 | /* record invert bit status because fw can corrupt it after suspend */ |
537 | th->pwm_inv[0] = read_reg(th, MANUAL_MODE[0]) & INVERT_MASK; |
538 | th->pwm_inv[1] = read_reg(th, MANUAL_MODE[1]) & INVERT_MASK; |
539 | |
540 | /* be sure to really write fan speed the first time */ |
541 | th->last_speed[0] = -2; |
542 | th->last_speed[1] = -2; |
543 | th->last_var[0] = -80; |
544 | th->last_var[1] = -80; |
545 | |
546 | if (fan_speed != -1) { |
547 | /* manual mode, stop fans */ |
548 | write_both_fan_speed(th, 0); |
549 | } else { |
550 | /* automatic mode */ |
551 | write_both_fan_speed(th, -1); |
552 | } |
553 | |
554 | th->thread = kthread_run(monitor_task, th, "kfand"); |
555 | if (th->thread == ERR_PTR(-ENOMEM)) { |
556 | printk(KERN_INFO "adt746x: Kthread creation failed\n"); |
557 | th->thread = NULL; |
558 | return -ENOMEM; |
559 | } |
560 | |
561 | thermostat_create_files(th); |
562 | |
563 | return 0; |
564 | } |
565 | |
566 | static int remove_thermostat(struct i2c_client *client) |
567 | { |
568 | struct thermostat *th = i2c_get_clientdata(client); |
569 | int i; |
570 | |
571 | thermostat_remove_files(th); |
572 | |
573 | if (th->thread != NULL) |
574 | kthread_stop(th->thread); |
575 | |
576 | printk(KERN_INFO "adt746x: Putting max temperatures back from " |
577 | "%d, %d, %d to %d, %d, %d\n", |
578 | th->limits[0], th->limits[1], th->limits[2], |
579 | th->initial_limits[0], th->initial_limits[1], |
580 | th->initial_limits[2]); |
581 | |
582 | for (i = 0; i < 3; i++) |
583 | write_reg(th, LIMIT_REG[i], th->initial_limits[i]); |
584 | |
585 | write_both_fan_speed(th, -1); |
586 | |
587 | kfree(th); |
588 | |
589 | return 0; |
590 | } |
591 | |
592 | static const struct i2c_device_id therm_adt746x_id[] = { |
593 | { "MAC,adt7460", ADT7460 }, |
594 | { "MAC,adt7467", ADT7467 }, |
595 | { } |
596 | }; |
597 | MODULE_DEVICE_TABLE(i2c, therm_adt746x_id); |
598 | |
599 | static struct i2c_driver thermostat_driver = { |
600 | .driver = { |
601 | .name = "therm_adt746x", |
602 | }, |
603 | .probe = probe_thermostat, |
604 | .remove = remove_thermostat, |
605 | .id_table = therm_adt746x_id, |
606 | }; |
607 | |
608 | static int __init thermostat_init(void) |
609 | { |
610 | #ifndef CONFIG_I2C_POWERMAC |
611 | request_module("i2c-powermac"); |
612 | #endif |
613 | |
614 | return i2c_add_driver(&thermostat_driver); |
615 | } |
616 | |
617 | static void __exit thermostat_exit(void) |
618 | { |
619 | i2c_del_driver(&thermostat_driver); |
620 | } |
621 | |
622 | module_init(thermostat_init); |
623 | module_exit(thermostat_exit); |
624 |
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