This source file includes following definitions.
- print_temp
- show_cpu_temperature
- show_case_temperature
- write_reg
- read_reg
- tune_fan
- poll_temp
- setup_hardware
- restore_regs
- control_loop
- do_attach
- do_remove
- attach_fan
- attach_thermostat
- do_probe
- therm_of_probe
- therm_of_remove
- g4fan_init
- g4fan_exit
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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
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;
60 int overheat_hyst;
61 int temp;
62 int casetemp;
63 int fan_level;
64
65 int downind;
66 int upind;
67
68 int r0, r1, r20, r23, r25;
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 },
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 }
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
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
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
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
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
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
228 write_reg( x.fan, 0x01, 0x01, 1 );
229
230 write_reg( x.fan, 0x23, 0x91, 1 );
231
232 write_reg( x.fan, 0x00, 0x95, 1 );
233
234
235
236
237
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
251 x.downind = 0xffff;
252 x.upind = -1;
253
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
301
302
303 static void do_attach(struct i2c_adapter *adapter)
304 {
305 struct i2c_board_info info = { };
306 struct device_node *np;
307
308
309 static const unsigned short scan_ds1775[] = {
310 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
311 I2C_CLIENT_END
312 };
313 static const unsigned short scan_adm1030[] = {
314 0x2c, 0x2d, 0x2e, 0x2f,
315 I2C_CLIENT_END
316 };
317
318 if (x.running || strncmp(adapter->name, "uni-n", 5))
319 return;
320
321 np = of_find_compatible_node(adapter->dev.of_node, NULL, "MAC,ds1775");
322 if (np) {
323 of_node_put(np);
324 } else {
325 strlcpy(info.type, "MAC,ds1775", I2C_NAME_SIZE);
326 i2c_new_probed_device(adapter, &info, scan_ds1775, NULL);
327 }
328
329 np = of_find_compatible_node(adapter->dev.of_node, NULL, "MAC,adm1030");
330 if (np) {
331 of_node_put(np);
332 } else {
333 strlcpy(info.type, "MAC,adm1030", I2C_NAME_SIZE);
334 i2c_new_probed_device(adapter, &info, scan_adm1030, NULL);
335 }
336 }
337
338 static int
339 do_remove(struct i2c_client *client)
340 {
341 if (x.running) {
342 x.running = 0;
343 kthread_stop(x.poll_task);
344 x.poll_task = NULL;
345 }
346 if (client == x.thermostat)
347 x.thermostat = NULL;
348 else if (client == x.fan)
349 x.fan = NULL;
350 else
351 printk(KERN_ERR "g4fan: bad client\n");
352
353 return 0;
354 }
355
356 static int
357 attach_fan( struct i2c_client *cl )
358 {
359 if( x.fan )
360 goto out;
361
362
363 if( read_reg(cl, 0x3d, 1) != 0x30 || read_reg(cl, 0x3e, 1) != 0x41 )
364 goto out;
365 printk("ADM1030 fan controller [@%02x]\n", cl->addr );
366
367 x.fan = cl;
368 out:
369 return 0;
370 }
371
372 static int
373 attach_thermostat( struct i2c_client *cl )
374 {
375 int hyst_temp, os_temp, temp;
376
377 if( x.thermostat )
378 goto out;
379
380 if( (temp=read_reg(cl, 0, 2)) < 0 )
381 goto out;
382
383
384 if( temp < 0x1600 || temp > 0x3c00 )
385 goto out;
386 hyst_temp = read_reg(cl, 2, 2);
387 os_temp = read_reg(cl, 3, 2);
388 if( hyst_temp < 0 || os_temp < 0 )
389 goto out;
390
391 printk("DS1775 digital thermometer [@%02x]\n", cl->addr );
392 print_temp("Temp: ", temp );
393 print_temp(" Hyst: ", hyst_temp );
394 print_temp(" OS: ", os_temp );
395 printk("\n");
396
397 x.temp = temp;
398 x.overheat_temp = os_temp;
399 x.overheat_hyst = hyst_temp;
400 x.thermostat = cl;
401 out:
402 return 0;
403 }
404
405 enum chip { ds1775, adm1030 };
406
407 static const struct i2c_device_id therm_windtunnel_id[] = {
408 { "MAC,ds1775", ds1775 },
409 { "MAC,adm1030", adm1030 },
410 { }
411 };
412 MODULE_DEVICE_TABLE(i2c, therm_windtunnel_id);
413
414 static int
415 do_probe(struct i2c_client *cl, const struct i2c_device_id *id)
416 {
417 struct i2c_adapter *adapter = cl->adapter;
418 int ret = 0;
419
420 if( !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA
421 | I2C_FUNC_SMBUS_WRITE_BYTE) )
422 return 0;
423
424 switch (id->driver_data) {
425 case adm1030:
426 ret = attach_fan(cl);
427 break;
428 case ds1775:
429 ret = attach_thermostat(cl);
430 break;
431 }
432
433 if (!x.running && x.thermostat && x.fan) {
434 x.running = 1;
435 x.poll_task = kthread_run(control_loop, NULL, "g4fand");
436 }
437
438 return ret;
439 }
440
441 static struct i2c_driver g4fan_driver = {
442 .driver = {
443 .name = "therm_windtunnel",
444 },
445 .probe = do_probe,
446 .remove = do_remove,
447 .id_table = therm_windtunnel_id,
448 };
449
450
451
452
453
454
455 static int therm_of_probe(struct platform_device *dev)
456 {
457 struct i2c_adapter *adap;
458 int ret, i = 0;
459
460 adap = i2c_get_adapter(0);
461 if (!adap)
462 return -EPROBE_DEFER;
463
464 ret = i2c_add_driver(&g4fan_driver);
465 if (ret) {
466 i2c_put_adapter(adap);
467 return ret;
468 }
469
470
471 while (adap) {
472 do_attach(adap);
473 if (x.running)
474 return 0;
475 i2c_put_adapter(adap);
476 adap = i2c_get_adapter(++i);
477 }
478
479 return -ENODEV;
480 }
481
482 static int
483 therm_of_remove( struct platform_device *dev )
484 {
485 i2c_del_driver( &g4fan_driver );
486 return 0;
487 }
488
489 static const struct of_device_id therm_of_match[] = {{
490 .name = "fan",
491 .compatible = "adm1030"
492 }, {}
493 };
494 MODULE_DEVICE_TABLE(of, therm_of_match);
495
496 static struct platform_driver therm_of_driver = {
497 .driver = {
498 .name = "temperature",
499 .of_match_table = therm_of_match,
500 },
501 .probe = therm_of_probe,
502 .remove = therm_of_remove,
503 };
504
505 struct apple_thermal_info {
506 u8 id;
507 u8 fan_count;
508 u8 thermostat_count;
509 u8 unused;
510 };
511
512 static int __init
513 g4fan_init( void )
514 {
515 const struct apple_thermal_info *info;
516 struct device_node *np;
517
518 mutex_init(&x.lock);
519
520 if( !(np=of_find_node_by_name(NULL, "power-mgt")) )
521 return -ENODEV;
522 info = of_get_property(np, "thermal-info", NULL);
523 of_node_put(np);
524
525 if( !info || !of_machine_is_compatible("PowerMac3,6") )
526 return -ENODEV;
527
528 if( info->id != 3 ) {
529 printk(KERN_ERR "therm_windtunnel: unsupported thermal design %d\n", info->id );
530 return -ENODEV;
531 }
532 if( !(np=of_find_node_by_name(NULL, "fan")) )
533 return -ENODEV;
534 x.of_dev = of_platform_device_create(np, "temperature", NULL);
535 of_node_put( np );
536
537 if( !x.of_dev ) {
538 printk(KERN_ERR "Can't register fan controller!\n");
539 return -ENODEV;
540 }
541
542 platform_driver_register( &therm_of_driver );
543 return 0;
544 }
545
546 static void __exit
547 g4fan_exit( void )
548 {
549 platform_driver_unregister( &therm_of_driver );
550
551 if( x.of_dev )
552 of_device_unregister( x.of_dev );
553 }
554
555 module_init(g4fan_init);
556 module_exit(g4fan_exit);
557
558 MODULE_AUTHOR("Samuel Rydh <samuel@ibrium.se>");
559 MODULE_DESCRIPTION("Apple G4 (windtunnel) fan controller");
560 MODULE_LICENSE("GPL");