Root/
1 | /* |
2 | * Creation Date: <2003/03/14 20:54:13 samuel> |
3 | * Time-stamp: <2004/03/20 14:20:59 samuel> |
4 | * |
5 | * <therm_windtunnel.c> |
6 | * |
7 | * The G4 "windtunnel" has a single fan controlled by an |
8 | * ADM1030 fan controller and a DS1775 thermostat. |
9 | * |
10 | * The fan controller is equipped with a temperature sensor |
11 | * which measures the case temperature. The DS1775 sensor |
12 | * measures the CPU temperature. This driver tunes the |
13 | * behavior of the fan. It is based upon empirical observations |
14 | * of the 'AppleFan' driver under Mac OS X. |
15 | * |
16 | * WARNING: This driver has only been testen on Apple's |
17 | * 1.25 MHz Dual G4 (March 03). It is tuned for a CPU |
18 | * temperature around 57 C. |
19 | * |
20 | * Copyright (C) 2003, 2004 Samuel Rydh (samuel@ibrium.se) |
21 | * |
22 | * Loosely based upon 'thermostat.c' written by Benjamin Herrenschmidt |
23 | * |
24 | * This program is free software; you can redistribute it and/or |
25 | * modify it under the terms of the GNU General Public License |
26 | * as published by the Free Software Foundation |
27 | * |
28 | */ |
29 | |
30 | #include <linux/types.h> |
31 | #include <linux/module.h> |
32 | #include <linux/errno.h> |
33 | #include <linux/kernel.h> |
34 | #include <linux/delay.h> |
35 | #include <linux/sched.h> |
36 | #include <linux/i2c.h> |
37 | #include <linux/init.h> |
38 | #include <linux/kthread.h> |
39 | #include <linux/of_platform.h> |
40 | |
41 | #include <asm/prom.h> |
42 | #include <asm/machdep.h> |
43 | #include <asm/io.h> |
44 | #include <asm/sections.h> |
45 | #include <asm/macio.h> |
46 | |
47 | #define LOG_TEMP 0 /* continuously log temperature */ |
48 | |
49 | static struct { |
50 | volatile int running; |
51 | struct task_struct *poll_task; |
52 | |
53 | struct mutex lock; |
54 | struct platform_device *of_dev; |
55 | |
56 | struct i2c_client *thermostat; |
57 | struct i2c_client *fan; |
58 | |
59 | int overheat_temp; /* 100% fan at this temp */ |
60 | int overheat_hyst; |
61 | int temp; |
62 | int casetemp; |
63 | int fan_level; /* active fan_table setting */ |
64 | |
65 | int downind; |
66 | int upind; |
67 | |
68 | int r0, r1, r20, r23, r25; /* saved register */ |
69 | } x; |
70 | |
71 | #define T(x,y) (((x)<<8) | (y)*0x100/10 ) |
72 | |
73 | static struct { |
74 | int fan_down_setting; |
75 | int temp; |
76 | int fan_up_setting; |
77 | } fan_table[] = { |
78 | { 11, T(0,0), 11 }, /* min fan */ |
79 | { 11, T(55,0), 11 }, |
80 | { 6, T(55,3), 11 }, |
81 | { 7, T(56,0), 11 }, |
82 | { 8, T(57,0), 8 }, |
83 | { 7, T(58,3), 7 }, |
84 | { 6, T(58,8), 6 }, |
85 | { 5, T(59,2), 5 }, |
86 | { 4, T(59,6), 4 }, |
87 | { 3, T(59,9), 3 }, |
88 | { 2, T(60,1), 2 }, |
89 | { 1, 0xfffff, 1 } /* on fire */ |
90 | }; |
91 | |
92 | static void |
93 | print_temp( const char *s, int temp ) |
94 | { |
95 | printk("%s%d.%d C", s ? s : "", temp>>8, (temp & 255)*10/256 ); |
96 | } |
97 | |
98 | static ssize_t |
99 | show_cpu_temperature( struct device *dev, struct device_attribute *attr, char *buf ) |
100 | { |
101 | return sprintf(buf, "%d.%d\n", x.temp>>8, (x.temp & 255)*10/256 ); |
102 | } |
103 | |
104 | static ssize_t |
105 | show_case_temperature( struct device *dev, struct device_attribute *attr, char *buf ) |
106 | { |
107 | return sprintf(buf, "%d.%d\n", x.casetemp>>8, (x.casetemp & 255)*10/256 ); |
108 | } |
109 | |
110 | static DEVICE_ATTR(cpu_temperature, S_IRUGO, show_cpu_temperature, NULL ); |
111 | static DEVICE_ATTR(case_temperature, S_IRUGO, show_case_temperature, NULL ); |
112 | |
113 | |
114 | |
115 | /************************************************************************/ |
116 | /* controller thread */ |
117 | /************************************************************************/ |
118 | |
119 | static int |
120 | write_reg( struct i2c_client *cl, int reg, int data, int len ) |
121 | { |
122 | u8 tmp[3]; |
123 | |
124 | if( len < 1 || len > 2 || data < 0 ) |
125 | return -EINVAL; |
126 | |
127 | tmp[0] = reg; |
128 | tmp[1] = (len == 1) ? data : (data >> 8); |
129 | tmp[2] = data; |
130 | len++; |
131 | |
132 | if( i2c_master_send(cl, tmp, len) != len ) |
133 | return -ENODEV; |
134 | return 0; |
135 | } |
136 | |
137 | static int |
138 | read_reg( struct i2c_client *cl, int reg, int len ) |
139 | { |
140 | u8 buf[2]; |
141 | |
142 | if( len != 1 && len != 2 ) |
143 | return -EINVAL; |
144 | buf[0] = reg; |
145 | if( i2c_master_send(cl, buf, 1) != 1 ) |
146 | return -ENODEV; |
147 | if( i2c_master_recv(cl, buf, len) != len ) |
148 | return -ENODEV; |
149 | return (len == 2)? ((unsigned int)buf[0] << 8) | buf[1] : buf[0]; |
150 | } |
151 | |
152 | static void |
153 | tune_fan( int fan_setting ) |
154 | { |
155 | int val = (fan_setting << 3) | 7; |
156 | |
157 | /* write_reg( x.fan, 0x24, val, 1 ); */ |
158 | write_reg( x.fan, 0x25, val, 1 ); |
159 | write_reg( x.fan, 0x20, 0, 1 ); |
160 | print_temp("CPU-temp: ", x.temp ); |
161 | if( x.casetemp ) |
162 | print_temp(", Case: ", x.casetemp ); |
163 | printk(", Fan: %d (tuned %+d)\n", 11-fan_setting, x.fan_level-fan_setting ); |
164 | |
165 | x.fan_level = fan_setting; |
166 | } |
167 | |
168 | static void |
169 | poll_temp( void ) |
170 | { |
171 | int temp, i, level, casetemp; |
172 | |
173 | temp = read_reg( x.thermostat, 0, 2 ); |
174 | |
175 | /* this actually occurs when the computer is loaded */ |
176 | if( temp < 0 ) |
177 | return; |
178 | |
179 | casetemp = read_reg(x.fan, 0x0b, 1) << 8; |
180 | casetemp |= (read_reg(x.fan, 0x06, 1) & 0x7) << 5; |
181 | |
182 | if( LOG_TEMP && x.temp != temp ) { |
183 | print_temp("CPU-temp: ", temp ); |
184 | print_temp(", Case: ", casetemp ); |
185 | printk(", Fan: %d\n", 11-x.fan_level ); |
186 | } |
187 | x.temp = temp; |
188 | x.casetemp = casetemp; |
189 | |
190 | level = -1; |
191 | for( i=0; (temp & 0xffff) > fan_table[i].temp ; i++ ) |
192 | ; |
193 | if( i < x.downind ) |
194 | level = fan_table[i].fan_down_setting; |
195 | x.downind = i; |
196 | |
197 | for( i=0; (temp & 0xffff) >= fan_table[i+1].temp ; i++ ) |
198 | ; |
199 | if( x.upind < i ) |
200 | level = fan_table[i].fan_up_setting; |
201 | x.upind = i; |
202 | |
203 | if( level >= 0 ) |
204 | tune_fan( level ); |
205 | } |
206 | |
207 | |
208 | static void |
209 | setup_hardware( void ) |
210 | { |
211 | int val; |
212 | int err; |
213 | |
214 | /* save registers (if we unload the module) */ |
215 | x.r0 = read_reg( x.fan, 0x00, 1 ); |
216 | x.r1 = read_reg( x.fan, 0x01, 1 ); |
217 | x.r20 = read_reg( x.fan, 0x20, 1 ); |
218 | x.r23 = read_reg( x.fan, 0x23, 1 ); |
219 | x.r25 = read_reg( x.fan, 0x25, 1 ); |
220 | |
221 | /* improve measurement resolution (convergence time 1.5s) */ |
222 | if( (val=read_reg(x.thermostat, 1, 1)) >= 0 ) { |
223 | val |= 0x60; |
224 | if( write_reg( x.thermostat, 1, val, 1 ) ) |
225 | printk("Failed writing config register\n"); |
226 | } |
227 | /* disable interrupts and TAC input */ |
228 | write_reg( x.fan, 0x01, 0x01, 1 ); |
229 | /* enable filter */ |
230 | write_reg( x.fan, 0x23, 0x91, 1 ); |
231 | /* remote temp. controls fan */ |
232 | write_reg( x.fan, 0x00, 0x95, 1 ); |
233 | |
234 | /* The thermostat (which besides measureing temperature controls |
235 | * has a THERM output which puts the fan on 100%) is usually |
236 | * set to kick in at 80 C (chip default). We reduce this a bit |
237 | * to be on the safe side (OSX doesn't)... |
238 | */ |
239 | if( x.overheat_temp == (80 << 8) ) { |
240 | x.overheat_temp = 75 << 8; |
241 | x.overheat_hyst = 70 << 8; |
242 | write_reg( x.thermostat, 2, x.overheat_hyst, 2 ); |
243 | write_reg( x.thermostat, 3, x.overheat_temp, 2 ); |
244 | |
245 | print_temp("Reducing overheating limit to ", x.overheat_temp ); |
246 | print_temp(" (Hyst: ", x.overheat_hyst ); |
247 | printk(")\n"); |
248 | } |
249 | |
250 | /* set an initial fan setting */ |
251 | x.downind = 0xffff; |
252 | x.upind = -1; |
253 | /* tune_fan( fan_up_table[x.upind].fan_setting ); */ |
254 | |
255 | err = device_create_file( &x.of_dev->dev, &dev_attr_cpu_temperature ); |
256 | err |= device_create_file( &x.of_dev->dev, &dev_attr_case_temperature ); |
257 | if (err) |
258 | printk(KERN_WARNING |
259 | "Failed to create temperature attribute file(s).\n"); |
260 | } |
261 | |
262 | static void |
263 | restore_regs( void ) |
264 | { |
265 | device_remove_file( &x.of_dev->dev, &dev_attr_cpu_temperature ); |
266 | device_remove_file( &x.of_dev->dev, &dev_attr_case_temperature ); |
267 | |
268 | write_reg( x.fan, 0x01, x.r1, 1 ); |
269 | write_reg( x.fan, 0x20, x.r20, 1 ); |
270 | write_reg( x.fan, 0x23, x.r23, 1 ); |
271 | write_reg( x.fan, 0x25, x.r25, 1 ); |
272 | write_reg( x.fan, 0x00, x.r0, 1 ); |
273 | } |
274 | |
275 | static int control_loop(void *dummy) |
276 | { |
277 | mutex_lock(&x.lock); |
278 | setup_hardware(); |
279 | mutex_unlock(&x.lock); |
280 | |
281 | for (;;) { |
282 | msleep_interruptible(8000); |
283 | if (kthread_should_stop()) |
284 | break; |
285 | |
286 | mutex_lock(&x.lock); |
287 | poll_temp(); |
288 | mutex_unlock(&x.lock); |
289 | } |
290 | |
291 | mutex_lock(&x.lock); |
292 | restore_regs(); |
293 | mutex_unlock(&x.lock); |
294 | |
295 | return 0; |
296 | } |
297 | |
298 | |
299 | /************************************************************************/ |
300 | /* i2c probing and setup */ |
301 | /************************************************************************/ |
302 | |
303 | static int |
304 | do_attach( struct i2c_adapter *adapter ) |
305 | { |
306 | /* scan 0x48-0x4f (DS1775) and 0x2c-2x2f (ADM1030) */ |
307 | static const unsigned short scan_ds1775[] = { |
308 | 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, |
309 | I2C_CLIENT_END |
310 | }; |
311 | static const unsigned short scan_adm1030[] = { |
312 | 0x2c, 0x2d, 0x2e, 0x2f, |
313 | I2C_CLIENT_END |
314 | }; |
315 | |
316 | if( strncmp(adapter->name, "uni-n", 5) ) |
317 | return 0; |
318 | |
319 | if( !x.running ) { |
320 | struct i2c_board_info info; |
321 | |
322 | memset(&info, 0, sizeof(struct i2c_board_info)); |
323 | strlcpy(info.type, "therm_ds1775", I2C_NAME_SIZE); |
324 | i2c_new_probed_device(adapter, &info, scan_ds1775, NULL); |
325 | |
326 | strlcpy(info.type, "therm_adm1030", I2C_NAME_SIZE); |
327 | i2c_new_probed_device(adapter, &info, scan_adm1030, NULL); |
328 | |
329 | if( x.thermostat && x.fan ) { |
330 | x.running = 1; |
331 | x.poll_task = kthread_run(control_loop, NULL, "g4fand"); |
332 | } |
333 | } |
334 | return 0; |
335 | } |
336 | |
337 | static int |
338 | do_remove(struct i2c_client *client) |
339 | { |
340 | if (x.running) { |
341 | x.running = 0; |
342 | kthread_stop(x.poll_task); |
343 | x.poll_task = NULL; |
344 | } |
345 | if (client == x.thermostat) |
346 | x.thermostat = NULL; |
347 | else if (client == x.fan) |
348 | x.fan = NULL; |
349 | else |
350 | printk(KERN_ERR "g4fan: bad client\n"); |
351 | |
352 | return 0; |
353 | } |
354 | |
355 | static int |
356 | attach_fan( struct i2c_client *cl ) |
357 | { |
358 | if( x.fan ) |
359 | goto out; |
360 | |
361 | /* check that this is an ADM1030 */ |
362 | if( read_reg(cl, 0x3d, 1) != 0x30 || read_reg(cl, 0x3e, 1) != 0x41 ) |
363 | goto out; |
364 | printk("ADM1030 fan controller [@%02x]\n", cl->addr ); |
365 | |
366 | x.fan = cl; |
367 | out: |
368 | return 0; |
369 | } |
370 | |
371 | static int |
372 | attach_thermostat( struct i2c_client *cl ) |
373 | { |
374 | int hyst_temp, os_temp, temp; |
375 | |
376 | if( x.thermostat ) |
377 | goto out; |
378 | |
379 | if( (temp=read_reg(cl, 0, 2)) < 0 ) |
380 | goto out; |
381 | |
382 | /* temperature sanity check */ |
383 | if( temp < 0x1600 || temp > 0x3c00 ) |
384 | goto out; |
385 | hyst_temp = read_reg(cl, 2, 2); |
386 | os_temp = read_reg(cl, 3, 2); |
387 | if( hyst_temp < 0 || os_temp < 0 ) |
388 | goto out; |
389 | |
390 | printk("DS1775 digital thermometer [@%02x]\n", cl->addr ); |
391 | print_temp("Temp: ", temp ); |
392 | print_temp(" Hyst: ", hyst_temp ); |
393 | print_temp(" OS: ", os_temp ); |
394 | printk("\n"); |
395 | |
396 | x.temp = temp; |
397 | x.overheat_temp = os_temp; |
398 | x.overheat_hyst = hyst_temp; |
399 | x.thermostat = cl; |
400 | out: |
401 | return 0; |
402 | } |
403 | |
404 | enum chip { ds1775, adm1030 }; |
405 | |
406 | static const struct i2c_device_id therm_windtunnel_id[] = { |
407 | { "therm_ds1775", ds1775 }, |
408 | { "therm_adm1030", adm1030 }, |
409 | { } |
410 | }; |
411 | |
412 | static int |
413 | do_probe(struct i2c_client *cl, const struct i2c_device_id *id) |
414 | { |
415 | struct i2c_adapter *adapter = cl->adapter; |
416 | |
417 | if( !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA |
418 | | I2C_FUNC_SMBUS_WRITE_BYTE) ) |
419 | return 0; |
420 | |
421 | switch (id->driver_data) { |
422 | case adm1030: |
423 | return attach_fan( cl ); |
424 | case ds1775: |
425 | return attach_thermostat(cl); |
426 | } |
427 | return 0; |
428 | } |
429 | |
430 | static struct i2c_driver g4fan_driver = { |
431 | .driver = { |
432 | .name = "therm_windtunnel", |
433 | }, |
434 | .attach_adapter = do_attach, |
435 | .probe = do_probe, |
436 | .remove = do_remove, |
437 | .id_table = therm_windtunnel_id, |
438 | }; |
439 | |
440 | |
441 | /************************************************************************/ |
442 | /* initialization / cleanup */ |
443 | /************************************************************************/ |
444 | |
445 | static int therm_of_probe(struct platform_device *dev) |
446 | { |
447 | return i2c_add_driver( &g4fan_driver ); |
448 | } |
449 | |
450 | static int |
451 | therm_of_remove( struct platform_device *dev ) |
452 | { |
453 | i2c_del_driver( &g4fan_driver ); |
454 | return 0; |
455 | } |
456 | |
457 | static const struct of_device_id therm_of_match[] = {{ |
458 | .name = "fan", |
459 | .compatible = "adm1030" |
460 | }, {} |
461 | }; |
462 | |
463 | static struct platform_driver therm_of_driver = { |
464 | .driver = { |
465 | .name = "temperature", |
466 | .owner = THIS_MODULE, |
467 | .of_match_table = therm_of_match, |
468 | }, |
469 | .probe = therm_of_probe, |
470 | .remove = therm_of_remove, |
471 | }; |
472 | |
473 | struct apple_thermal_info { |
474 | u8 id; /* implementation ID */ |
475 | u8 fan_count; /* number of fans */ |
476 | u8 thermostat_count; /* number of thermostats */ |
477 | u8 unused; |
478 | }; |
479 | |
480 | static int __init |
481 | g4fan_init( void ) |
482 | { |
483 | const struct apple_thermal_info *info; |
484 | struct device_node *np; |
485 | |
486 | mutex_init(&x.lock); |
487 | |
488 | if( !(np=of_find_node_by_name(NULL, "power-mgt")) ) |
489 | return -ENODEV; |
490 | info = of_get_property(np, "thermal-info", NULL); |
491 | of_node_put(np); |
492 | |
493 | if( !info || !of_machine_is_compatible("PowerMac3,6") ) |
494 | return -ENODEV; |
495 | |
496 | if( info->id != 3 ) { |
497 | printk(KERN_ERR "therm_windtunnel: unsupported thermal design %d\n", info->id ); |
498 | return -ENODEV; |
499 | } |
500 | if( !(np=of_find_node_by_name(NULL, "fan")) ) |
501 | return -ENODEV; |
502 | x.of_dev = of_platform_device_create(np, "temperature", NULL); |
503 | of_node_put( np ); |
504 | |
505 | if( !x.of_dev ) { |
506 | printk(KERN_ERR "Can't register fan controller!\n"); |
507 | return -ENODEV; |
508 | } |
509 | |
510 | platform_driver_register( &therm_of_driver ); |
511 | return 0; |
512 | } |
513 | |
514 | static void __exit |
515 | g4fan_exit( void ) |
516 | { |
517 | platform_driver_unregister( &therm_of_driver ); |
518 | |
519 | if( x.of_dev ) |
520 | of_device_unregister( x.of_dev ); |
521 | } |
522 | |
523 | module_init(g4fan_init); |
524 | module_exit(g4fan_exit); |
525 | |
526 | MODULE_AUTHOR("Samuel Rydh <samuel@ibrium.se>"); |
527 | MODULE_DESCRIPTION("Apple G4 (windtunnel) fan controller"); |
528 | MODULE_LICENSE("GPL"); |
529 |
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