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Linux v2.6.13
[linux-2.6/next.git] / drivers / macintosh / therm_adt746x.c
blobc9ca1118e449207c2dca58a742b0ddd204a556d7
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
7 * http://www.analog.com/UploadedFiles/Data_Sheets/115254175ADT7467_pra.pdf
8 * http://www.analog.com/UploadedFiles/Data_Sheets/3686221171167ADT7460_b.pdf
9 *
10 */
11
12 #include <linux/config.h>
13 #include <linux/types.h>
14 #include <linux/module.h>
15 #include <linux/errno.h>
16 #include <linux/kernel.h>
17 #include <linux/delay.h>
18 #include <linux/sched.h>
19 #include <linux/i2c.h>
20 #include <linux/slab.h>
21 #include <linux/init.h>
22 #include <linux/spinlock.h>
23 #include <linux/smp_lock.h>
24 #include <linux/wait.h>
25 #include <linux/suspend.h>
26 #include <linux/kthread.h>
27 #include <linux/moduleparam.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 #include <asm/of_device.h>
35
36 #undef DEBUG
37
38 #define CONFIG_REG 0x40
39 #define MANUAL_MASK 0xe0
40 #define AUTO_MASK 0x20
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 char *sensor_location[3] = {NULL, NULL, NULL};
52
53 static int limit_adjust = 0;
54 static int fan_speed = -1;
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 struct thermostat {
70 struct i2c_client clt;
71 u8 temps[3];
72 u8 cached_temp[3];
73 u8 initial_limits[3];
74 u8 limits[3];
75 int last_speed[2];
76 int last_var[2];
77 };
78
79 static enum {ADT7460, ADT7467} therm_type;
80 static int therm_bus, therm_address;
81 static struct of_device * of_dev;
82 static struct thermostat* thermostat;
83 static struct task_struct *thread_therm = NULL;
84
85 static int attach_one_thermostat(struct i2c_adapter *adapter, int addr,
86 int busno);
87
88 static void write_both_fan_speed(struct thermostat *th, int speed);
89 static void write_fan_speed(struct thermostat *th, int speed, int fan);
90
91 static int
92 write_reg(struct thermostat* th, int reg, u8 data)
93 {
94 u8 tmp[2];
95 int rc;
96
97 tmp[0] = reg;
98 tmp[1] = data;
99 rc = i2c_master_send(&th->clt, (const char *)tmp, 2);
100 if (rc < 0)
101 return rc;
102 if (rc != 2)
103 return -ENODEV;
104 return 0;
105 }
106
107 static int
108 read_reg(struct thermostat* th, int reg)
109 {
110 u8 reg_addr, data;
111 int rc;
112
113 reg_addr = (u8)reg;
114 rc = i2c_master_send(&th->clt, &reg_addr, 1);
115 if (rc < 0)
116 return rc;
117 if (rc != 1)
118 return -ENODEV;
119 rc = i2c_master_recv(&th->clt, (char *)&data, 1);
120 if (rc < 0)
121 return rc;
122 return data;
123 }
124
125 static int
126 attach_thermostat(struct i2c_adapter *adapter)
127 {
128 unsigned long bus_no;
129
130 if (strncmp(adapter->name, "uni-n", 5))
131 return -ENODEV;
132 bus_no = simple_strtoul(adapter->name + 6, NULL, 10);
133 if (bus_no != therm_bus)
134 return -ENODEV;
135 return attach_one_thermostat(adapter, therm_address, bus_no);
136 }
137
138 static int
139 detach_thermostat(struct i2c_adapter *adapter)
140 {
141 struct thermostat* th;
142 int i;
143
144 if (thermostat == NULL)
145 return 0;
146
147 th = thermostat;
148
149 if (thread_therm != NULL) {
150 kthread_stop(thread_therm);
151 }
152
153 printk(KERN_INFO "adt746x: Putting max temperatures back from "
154 "%d, %d, %d to %d, %d, %d\n",
155 th->limits[0], th->limits[1], th->limits[2],
156 th->initial_limits[0], th->initial_limits[1],
157 th->initial_limits[2]);
158
159 for (i = 0; i < 3; i++)
160 write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
161
162 write_both_fan_speed(th, -1);
163
164 i2c_detach_client(&th->clt);
165
166 thermostat = NULL;
167
168 kfree(th);
169
170 return 0;
171 }
172
173 static struct i2c_driver thermostat_driver = {
174 .owner = THIS_MODULE,
175 .name = "therm_adt746x",
176 .flags = I2C_DF_NOTIFY,
177 .attach_adapter = attach_thermostat,
178 .detach_adapter = detach_thermostat,
179 };
180
181 static int read_fan_speed(struct thermostat *th, u8 addr)
182 {
183 u8 tmp[2];
184 u16 res;
185
186 /* should start with low byte */
187 tmp[1] = read_reg(th, addr);
188 tmp[0] = read_reg(th, addr + 1);
189
190 res = tmp[1] + (tmp[0] << 8);
191 /* "a value of 0xffff means that the fan has stopped" */
192 return (res == 0xffff ? 0 : (90000*60)/res);
193 }
194
195 static void write_both_fan_speed(struct thermostat *th, int speed)
196 {
197 write_fan_speed(th, speed, 0);
198 if (therm_type == ADT7460)
199 write_fan_speed(th, speed, 1);
200 }
201
202 static void write_fan_speed(struct thermostat *th, int speed, int fan)
203 {
204 u8 manual;
205
206 if (speed > 0xff)
207 speed = 0xff;
208 else if (speed < -1)
209 speed = 0;
210
211 if (therm_type == ADT7467 && fan == 1)
212 return;
213
214 if (th->last_speed[fan] != speed) {
215 if (speed == -1)
216 printk(KERN_DEBUG "adt746x: Setting speed to automatic "
217 "for %s fan.\n", sensor_location[fan+1]);
218 else
219 printk(KERN_DEBUG "adt746x: Setting speed to %d "
220 "for %s fan.\n", speed, sensor_location[fan+1]);
221 } else
222 return;
223
224 if (speed >= 0) {
225 manual = read_reg(th, MANUAL_MODE[fan]);
226 write_reg(th, MANUAL_MODE[fan], manual|MANUAL_MASK);
227 write_reg(th, FAN_SPD_SET[fan], speed);
228 } else {
229 /* back to automatic */
230 if(therm_type == ADT7460) {
231 manual = read_reg(th,
232 MANUAL_MODE[fan]) & (~MANUAL_MASK);
233
234 write_reg(th,
235 MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
236 } else {
237 manual = read_reg(th, MANUAL_MODE[fan]);
238 write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
239 }
240 }
241
242 th->last_speed[fan] = speed;
243 }
244
245 static void read_sensors(struct thermostat *th)
246 {
247 int i = 0;
248
249 for (i = 0; i < 3; i++)
250 th->temps[i] = read_reg(th, TEMP_REG[i]);
251 }
252
253 #ifdef DEBUG
254 static void display_stats(struct thermostat *th)
255 {
256 if (th->temps[0] != th->cached_temp[0]
257 || th->temps[1] != th->cached_temp[1]
258 || th->temps[2] != th->cached_temp[2]) {
259 printk(KERN_INFO "adt746x: Temperature infos:"
260 " thermostats: %d,%d,%d;"
261 " limits: %d,%d,%d;"
262 " fan speed: %d RPM\n",
263 th->temps[0], th->temps[1], th->temps[2],
264 th->limits[0], th->limits[1], th->limits[2],
265 read_fan_speed(th, FAN_SPEED[0]));
266 }
267 th->cached_temp[0] = th->temps[0];
268 th->cached_temp[1] = th->temps[1];
269 th->cached_temp[2] = th->temps[2];
270 }
271 #endif
272
273 static void update_fans_speed (struct thermostat *th)
274 {
275 int lastvar = 0; /* last variation, for iBook */
276 int i = 0;
277
278 /* we don't care about local sensor, so we start at sensor 1 */
279 for (i = 1; i < 3; i++) {
280 int started = 0;
281 int fan_number = (therm_type == ADT7460 && i == 2);
282 int var = th->temps[i] - th->limits[i];
283
284 if (var > -1) {
285 int step = (255 - fan_speed) / 7;
286 int new_speed = 0;
287
288 /* hysteresis : change fan speed only if variation is
289 * more than two degrees */
290 if (abs(var - th->last_var[fan_number]) < 2)
291 continue;
292
293 started = 1;
294 new_speed = fan_speed + ((var-1)*step);
295
296 if (new_speed < fan_speed)
297 new_speed = fan_speed;
298 if (new_speed > 255)
299 new_speed = 255;
300
301 printk(KERN_DEBUG "adt746x: setting fans speed to %d "
302 "(limit exceeded by %d on %s) \n",
303 new_speed, var,
304 sensor_location[fan_number+1]);
305 write_both_fan_speed(th, new_speed);
306 th->last_var[fan_number] = var;
307 } else if (var < -2) {
308 /* don't stop fan if sensor2 is cold and sensor1 is not
309 * so cold (lastvar >= -1) */
310 if (i == 2 && lastvar < -1) {
311 if (th->last_speed[fan_number] != 0)
312 printk(KERN_DEBUG "adt746x: Stopping "
313 "fans.\n");
314 write_both_fan_speed(th, 0);
315 }
316 }
317
318 lastvar = var;
319
320 if (started)
321 return; /* we don't want to re-stop the fan
322 * if sensor1 is heating and sensor2 is not */
323 }
324 }
325
326 static int monitor_task(void *arg)
327 {
328 struct thermostat* th = arg;
329
330 while(!kthread_should_stop()) {
331 try_to_freeze();
332 msleep_interruptible(2000);
333
334 #ifndef DEBUG
335 if (fan_speed != -1)
336 read_sensors(th);
337 #else
338 read_sensors(th);
339 #endif
340
341 if (fan_speed != -1)
342 update_fans_speed(th);
343
344 #ifdef DEBUG
345 display_stats(th);
346 #endif
347
348 }
349
350 return 0;
351 }
352
353 static void set_limit(struct thermostat *th, int i)
354 {
355 /* Set sensor1 limit higher to avoid powerdowns */
356 th->limits[i] = default_limits_chip[i] + limit_adjust;
357 write_reg(th, LIMIT_REG[i], th->limits[i]);
358
359 /* set our limits to normal */
360 th->limits[i] = default_limits_local[i] + limit_adjust;
361 }
362
363 static int attach_one_thermostat(struct i2c_adapter *adapter, int addr,
364 int busno)
365 {
366 struct thermostat* th;
367 int rc;
368 int i;
369
370 if (thermostat)
371 return 0;
372
373 th = (struct thermostat *)
374 kmalloc(sizeof(struct thermostat), GFP_KERNEL);
375
376 if (!th)
377 return -ENOMEM;
378
379 memset(th, 0, sizeof(*th));
380 th->clt.addr = addr;
381 th->clt.adapter = adapter;
382 th->clt.driver = &thermostat_driver;
383 strcpy(th->clt.name, "thermostat");
384
385 rc = read_reg(th, 0);
386 if (rc < 0) {
387 printk(KERN_ERR "adt746x: Thermostat failed to read config "
388 "from bus %d !\n",
389 busno);
390 kfree(th);
391 return -ENODEV;
392 }
393
394 /* force manual control to start the fan quieter */
395 if (fan_speed == -1)
396 fan_speed = 64;
397
398 if(therm_type == ADT7460) {
399 printk(KERN_INFO "adt746x: ADT7460 initializing\n");
400 /* The 7460 needs to be started explicitly */
401 write_reg(th, CONFIG_REG, 1);
402 } else
403 printk(KERN_INFO "adt746x: ADT7467 initializing\n");
404
405 for (i = 0; i < 3; i++) {
406 th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
407 set_limit(th, i);
408 }
409
410 printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
411 " to %d, %d, %d\n",
412 th->initial_limits[0], th->initial_limits[1],
413 th->initial_limits[2], th->limits[0], th->limits[1],
414 th->limits[2]);
415
416 thermostat = th;
417
418 if (i2c_attach_client(&th->clt)) {
419 printk(KERN_INFO "adt746x: Thermostat failed to attach "
420 "client !\n");
421 thermostat = NULL;
422 kfree(th);
423 return -ENODEV;
424 }
425
426 /* be sure to really write fan speed the first time */
427 th->last_speed[0] = -2;
428 th->last_speed[1] = -2;
429 th->last_var[0] = -80;
430 th->last_var[1] = -80;
431
432 if (fan_speed != -1) {
433 /* manual mode, stop fans */
434 write_both_fan_speed(th, 0);
435 } else {
436 /* automatic mode */
437 write_both_fan_speed(th, -1);
438 }
439
440 thread_therm = kthread_run(monitor_task, th, "kfand");
441
442 if (thread_therm == ERR_PTR(-ENOMEM)) {
443 printk(KERN_INFO "adt746x: Kthread creation failed\n");
444 thread_therm = NULL;
445 return -ENOMEM;
446 }
447
448 return 0;
449 }
450
451 /*
452 * Now, unfortunately, sysfs doesn't give us a nice void * we could
453 * pass around to the attribute functions, so we don't really have
454 * choice but implement a bunch of them...
455 *
456 * FIXME, it does now...
457 */
458 #define BUILD_SHOW_FUNC_INT(name, data) \
459 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
460 { \
461 return sprintf(buf, "%d\n", data); \
462 }
463
464 #define BUILD_SHOW_FUNC_STR(name, data) \
465 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
466 { \
467 return sprintf(buf, "%s\n", data); \
468 }
469
470 #define BUILD_SHOW_FUNC_FAN(name, data) \
471 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
472 { \
473 return sprintf(buf, "%d (%d rpm)\n", \
474 thermostat->last_speed[data], \
475 read_fan_speed(thermostat, FAN_SPEED[data]) \
476 ); \
477 }
478
479 #define BUILD_STORE_FUNC_DEG(name, data) \
480 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
481 { \
482 int val; \
483 int i; \
484 val = simple_strtol(buf, NULL, 10); \
485 printk(KERN_INFO "Adjusting limits by %d degrees\n", val); \
486 limit_adjust = val; \
487 for (i=0; i < 3; i++) \
488 set_limit(thermostat, i); \
489 return n; \
490 }
491
492 #define BUILD_STORE_FUNC_INT(name, data) \
493 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
494 { \
495 u32 val; \
496 val = simple_strtoul(buf, NULL, 10); \
497 if (val < 0 || val > 255) \
498 return -EINVAL; \
499 printk(KERN_INFO "Setting specified fan speed to %d\n", val); \
500 data = val; \
501 return n; \
502 }
503
504 BUILD_SHOW_FUNC_INT(sensor1_temperature, (read_reg(thermostat, TEMP_REG[1])))
505 BUILD_SHOW_FUNC_INT(sensor2_temperature, (read_reg(thermostat, TEMP_REG[2])))
506 BUILD_SHOW_FUNC_INT(sensor1_limit, thermostat->limits[1])
507 BUILD_SHOW_FUNC_INT(sensor2_limit, thermostat->limits[2])
508 BUILD_SHOW_FUNC_STR(sensor1_location, sensor_location[1])
509 BUILD_SHOW_FUNC_STR(sensor2_location, sensor_location[2])
510
511 BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
512 BUILD_SHOW_FUNC_FAN(sensor1_fan_speed, 0)
513 BUILD_SHOW_FUNC_FAN(sensor2_fan_speed, 1)
514
515 BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
516 BUILD_SHOW_FUNC_INT(limit_adjust, limit_adjust)
517 BUILD_STORE_FUNC_DEG(limit_adjust, thermostat)
518
519 static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
520 show_sensor1_temperature,NULL);
521 static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
522 show_sensor2_temperature,NULL);
523 static DEVICE_ATTR(sensor1_limit, S_IRUGO,
524 show_sensor1_limit, NULL);
525 static DEVICE_ATTR(sensor2_limit, S_IRUGO,
526 show_sensor2_limit, NULL);
527 static DEVICE_ATTR(sensor1_location, S_IRUGO,
528 show_sensor1_location, NULL);
529 static DEVICE_ATTR(sensor2_location, S_IRUGO,
530 show_sensor2_location, NULL);
531
532 static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
533 show_specified_fan_speed,store_specified_fan_speed);
534
535 static DEVICE_ATTR(sensor1_fan_speed, S_IRUGO,
536 show_sensor1_fan_speed, NULL);
537 static DEVICE_ATTR(sensor2_fan_speed, S_IRUGO,
538 show_sensor2_fan_speed, NULL);
539
540 static DEVICE_ATTR(limit_adjust, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
541 show_limit_adjust, store_limit_adjust);
542
543
544 static int __init
545 thermostat_init(void)
546 {
547 struct device_node* np;
548 u32 *prop;
549 int i = 0, offset = 0;
550
551 np = of_find_node_by_name(NULL, "fan");
552 if (!np)
553 return -ENODEV;
554 if (device_is_compatible(np, "adt7460"))
555 therm_type = ADT7460;
556 else if (device_is_compatible(np, "adt7467"))
557 therm_type = ADT7467;
558 else
559 return -ENODEV;
560
561 prop = (u32 *)get_property(np, "hwsensor-params-version", NULL);
562 printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
563 (*prop == 1)?"":"un");
564 if (*prop != 1)
565 return -ENODEV;
566
567 prop = (u32 *)get_property(np, "reg", NULL);
568 if (!prop)
569 return -ENODEV;
570
571 /* look for bus either by path or using "reg" */
572 if (strstr(np->full_name, "/i2c-bus@") != NULL) {
573 const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
574 therm_bus = tmp_bus[0]-'0';
575 } else {
576 therm_bus = ((*prop) >> 8) & 0x0f;
577 }
578
579 therm_address = ((*prop) & 0xff) >> 1;
580
581 printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
582 "limit_adjust: %d, fan_speed: %d\n",
583 therm_bus, therm_address, limit_adjust, fan_speed);
584
585 if (get_property(np, "hwsensor-location", NULL)) {
586 for (i = 0; i < 3; i++) {
587 sensor_location[i] = get_property(np,
588 "hwsensor-location", NULL) + offset;
589
590 if (sensor_location[i] == NULL)
591 sensor_location[i] = "";
592
593 printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
594 offset += strlen(sensor_location[i]) + 1;
595 }
596 } else {
597 sensor_location[0] = "?";
598 sensor_location[1] = "?";
599 sensor_location[2] = "?";
600 }
601
602 of_dev = of_platform_device_create(np, "temperatures");
603
604 if (of_dev == NULL) {
605 printk(KERN_ERR "Can't register temperatures device !\n");
606 return -ENODEV;
607 }
608
609 device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
610 device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
611 device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
612 device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
613 device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
614 device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
615 device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
616 device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
617 device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
618 if(therm_type == ADT7460)
619 device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
620
621 #ifndef CONFIG_I2C_KEYWEST
622 request_module("i2c-keywest");
623 #endif
624
625 return i2c_add_driver(&thermostat_driver);
626 }
627
628 static void __exit
629 thermostat_exit(void)
630 {
631 if (of_dev) {
632 device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
633 device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
634 device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
635 device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
636 device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
637 device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
638 device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
639 device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
640 device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
641
642 if(therm_type == ADT7460)
643 device_remove_file(&of_dev->dev,
644 &dev_attr_sensor2_fan_speed);
645
646 of_device_unregister(of_dev);
647 }
648 i2c_del_driver(&thermostat_driver);
649 }
650
651 module_init(thermostat_init);
652 module_exit(thermostat_exit);
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