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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/system.h>
45#include <asm/sections.h>
46#include <asm/macio.h>
47
48#define LOG_TEMP 0
49
50static struct {
51 volatile int running;
52 struct task_struct *poll_task;
53
54 struct mutex lock;
55 struct platform_device *of_dev;
56
57 struct i2c_client *thermostat;
58 struct i2c_client *fan;
59
60 int overheat_temp;
61 int overheat_hyst;
62 int temp;
63 int casetemp;
64 int fan_level;
65
66 int downind;
67 int upind;
68
69 int r0, r1, r20, r23, r25;
70} x;
71
72#define T(x,y) (((x)<<8) | (y)*0x100/10 )
73
74static struct {
75 int fan_down_setting;
76 int temp;
77 int fan_up_setting;
78} fan_table[] = {
79 { 11, T(0,0), 11 },
80 { 11, T(55,0), 11 },
81 { 6, T(55,3), 11 },
82 { 7, T(56,0), 11 },
83 { 8, T(57,0), 8 },
84 { 7, T(58,3), 7 },
85 { 6, T(58,8), 6 },
86 { 5, T(59,2), 5 },
87 { 4, T(59,6), 4 },
88 { 3, T(59,9), 3 },
89 { 2, T(60,1), 2 },
90 { 1, 0xfffff, 1 }
91};
92
93static void
94print_temp( const char *s, int temp )
95{
96 printk("%s%d.%d C", s ? s : "", temp>>8, (temp & 255)*10/256 );
97}
98
99static ssize_t
100show_cpu_temperature( struct device *dev, struct device_attribute *attr, char *buf )
101{
102 return sprintf(buf, "%d.%d\n", x.temp>>8, (x.temp & 255)*10/256 );
103}
104
105static ssize_t
106show_case_temperature( struct device *dev, struct device_attribute *attr, char *buf )
107{
108 return sprintf(buf, "%d.%d\n", x.casetemp>>8, (x.casetemp & 255)*10/256 );
109}
110
111static DEVICE_ATTR(cpu_temperature, S_IRUGO, show_cpu_temperature, NULL );
112static DEVICE_ATTR(case_temperature, S_IRUGO, show_case_temperature, NULL );
113
114
115
116
117
118
119
120static int
121write_reg( struct i2c_client *cl, int reg, int data, int len )
122{
123 u8 tmp[3];
124
125 if( len < 1 || len > 2 || data < 0 )
126 return -EINVAL;
127
128 tmp[0] = reg;
129 tmp[1] = (len == 1) ? data : (data >> 8);
130 tmp[2] = data;
131 len++;
132
133 if( i2c_master_send(cl, tmp, len) != len )
134 return -ENODEV;
135 return 0;
136}
137
138static int
139read_reg( struct i2c_client *cl, int reg, int len )
140{
141 u8 buf[2];
142
143 if( len != 1 && len != 2 )
144 return -EINVAL;
145 buf[0] = reg;
146 if( i2c_master_send(cl, buf, 1) != 1 )
147 return -ENODEV;
148 if( i2c_master_recv(cl, buf, len) != len )
149 return -ENODEV;
150 return (len == 2)? ((unsigned int)buf[0] << 8) | buf[1] : buf[0];
151}
152
153static void
154tune_fan( int fan_setting )
155{
156 int val = (fan_setting << 3) | 7;
157
158
159 write_reg( x.fan, 0x25, val, 1 );
160 write_reg( x.fan, 0x20, 0, 1 );
161 print_temp("CPU-temp: ", x.temp );
162 if( x.casetemp )
163 print_temp(", Case: ", x.casetemp );
164 printk(", Fan: %d (tuned %+d)\n", 11-fan_setting, x.fan_level-fan_setting );
165
166 x.fan_level = fan_setting;
167}
168
169static void
170poll_temp( void )
171{
172 int temp, i, level, casetemp;
173
174 temp = read_reg( x.thermostat, 0, 2 );
175
176
177 if( temp < 0 )
178 return;
179
180 casetemp = read_reg(x.fan, 0x0b, 1) << 8;
181 casetemp |= (read_reg(x.fan, 0x06, 1) & 0x7) << 5;
182
183 if( LOG_TEMP && x.temp != temp ) {
184 print_temp("CPU-temp: ", temp );
185 print_temp(", Case: ", casetemp );
186 printk(", Fan: %d\n", 11-x.fan_level );
187 }
188 x.temp = temp;
189 x.casetemp = casetemp;
190
191 level = -1;
192 for( i=0; (temp & 0xffff) > fan_table[i].temp ; i++ )
193 ;
194 if( i < x.downind )
195 level = fan_table[i].fan_down_setting;
196 x.downind = i;
197
198 for( i=0; (temp & 0xffff) >= fan_table[i+1].temp ; i++ )
199 ;
200 if( x.upind < i )
201 level = fan_table[i].fan_up_setting;
202 x.upind = i;
203
204 if( level >= 0 )
205 tune_fan( level );
206}
207
208
209static void
210setup_hardware( void )
211{
212 int val;
213 int err;
214
215
216 x.r0 = read_reg( x.fan, 0x00, 1 );
217 x.r1 = read_reg( x.fan, 0x01, 1 );
218 x.r20 = read_reg( x.fan, 0x20, 1 );
219 x.r23 = read_reg( x.fan, 0x23, 1 );
220 x.r25 = read_reg( x.fan, 0x25, 1 );
221
222
223 if( (val=read_reg(x.thermostat, 1, 1)) >= 0 ) {
224 val |= 0x60;
225 if( write_reg( x.thermostat, 1, val, 1 ) )
226 printk("Failed writing config register\n");
227 }
228
229 write_reg( x.fan, 0x01, 0x01, 1 );
230
231 write_reg( x.fan, 0x23, 0x91, 1 );
232
233 write_reg( x.fan, 0x00, 0x95, 1 );
234
235
236
237
238
239
240 if( x.overheat_temp == (80 << 8) ) {
241 x.overheat_temp = 75 << 8;
242 x.overheat_hyst = 70 << 8;
243 write_reg( x.thermostat, 2, x.overheat_hyst, 2 );
244 write_reg( x.thermostat, 3, x.overheat_temp, 2 );
245
246 print_temp("Reducing overheating limit to ", x.overheat_temp );
247 print_temp(" (Hyst: ", x.overheat_hyst );
248 printk(")\n");
249 }
250
251
252 x.downind = 0xffff;
253 x.upind = -1;
254
255
256 err = device_create_file( &x.of_dev->dev, &dev_attr_cpu_temperature );
257 err |= device_create_file( &x.of_dev->dev, &dev_attr_case_temperature );
258 if (err)
259 printk(KERN_WARNING
260 "Failed to create temperature attribute file(s).\n");
261}
262
263static void
264restore_regs( void )
265{
266 device_remove_file( &x.of_dev->dev, &dev_attr_cpu_temperature );
267 device_remove_file( &x.of_dev->dev, &dev_attr_case_temperature );
268
269 write_reg( x.fan, 0x01, x.r1, 1 );
270 write_reg( x.fan, 0x20, x.r20, 1 );
271 write_reg( x.fan, 0x23, x.r23, 1 );
272 write_reg( x.fan, 0x25, x.r25, 1 );
273 write_reg( x.fan, 0x00, x.r0, 1 );
274}
275
276static int control_loop(void *dummy)
277{
278 mutex_lock(&x.lock);
279 setup_hardware();
280 mutex_unlock(&x.lock);
281
282 for (;;) {
283 msleep_interruptible(8000);
284 if (kthread_should_stop())
285 break;
286
287 mutex_lock(&x.lock);
288 poll_temp();
289 mutex_unlock(&x.lock);
290 }
291
292 mutex_lock(&x.lock);
293 restore_regs();
294 mutex_unlock(&x.lock);
295
296 return 0;
297}
298
299
300
301
302
303
304static int
305do_attach( struct i2c_adapter *adapter )
306{
307
308 static const unsigned short scan_ds1775[] = {
309 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
310 I2C_CLIENT_END
311 };
312 static const unsigned short scan_adm1030[] = {
313 0x2c, 0x2d, 0x2e, 0x2f,
314 I2C_CLIENT_END
315 };
316
317 if( strncmp(adapter->name, "uni-n", 5) )
318 return 0;
319
320 if( !x.running ) {
321 struct i2c_board_info info;
322
323 memset(&info, 0, sizeof(struct i2c_board_info));
324 strlcpy(info.type, "therm_ds1775", I2C_NAME_SIZE);
325 i2c_new_probed_device(adapter, &info, scan_ds1775, NULL);
326
327 strlcpy(info.type, "therm_adm1030", I2C_NAME_SIZE);
328 i2c_new_probed_device(adapter, &info, scan_adm1030, NULL);
329
330 if( x.thermostat && x.fan ) {
331 x.running = 1;
332 x.poll_task = kthread_run(control_loop, NULL, "g4fand");
333 }
334 }
335 return 0;
336}
337
338static int
339do_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
356static int
357attach_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
372static int
373attach_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;
401out:
402 return 0;
403}
404
405enum chip { ds1775, adm1030 };
406
407static const struct i2c_device_id therm_windtunnel_id[] = {
408 { "therm_ds1775", ds1775 },
409 { "therm_adm1030", adm1030 },
410 { }
411};
412
413static int
414do_probe(struct i2c_client *cl, const struct i2c_device_id *id)
415{
416 struct i2c_adapter *adapter = cl->adapter;
417
418 if( !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA
419 | I2C_FUNC_SMBUS_WRITE_BYTE) )
420 return 0;
421
422 switch (id->driver_data) {
423 case adm1030:
424 return attach_fan( cl );
425 case ds1775:
426 return attach_thermostat(cl);
427 }
428 return 0;
429}
430
431static struct i2c_driver g4fan_driver = {
432 .driver = {
433 .name = "therm_windtunnel",
434 },
435 .attach_adapter = do_attach,
436 .probe = do_probe,
437 .remove = do_remove,
438 .id_table = therm_windtunnel_id,
439};
440
441
442
443
444
445
446static int
447therm_of_probe( struct platform_device *dev, const struct of_device_id *match )
448{
449 return i2c_add_driver( &g4fan_driver );
450}
451
452static int
453therm_of_remove( struct platform_device *dev )
454{
455 i2c_del_driver( &g4fan_driver );
456 return 0;
457}
458
459static const struct of_device_id therm_of_match[] = {{
460 .name = "fan",
461 .compatible = "adm1030"
462 }, {}
463};
464
465static struct of_platform_driver therm_of_driver = {
466 .driver = {
467 .name = "temperature",
468 .owner = THIS_MODULE,
469 .of_match_table = therm_of_match,
470 },
471 .probe = therm_of_probe,
472 .remove = therm_of_remove,
473};
474
475struct apple_thermal_info {
476 u8 id;
477 u8 fan_count;
478 u8 thermostat_count;
479 u8 unused;
480};
481
482static int __init
483g4fan_init( void )
484{
485 const struct apple_thermal_info *info;
486 struct device_node *np;
487
488 mutex_init(&x.lock);
489
490 if( !(np=of_find_node_by_name(NULL, "power-mgt")) )
491 return -ENODEV;
492 info = of_get_property(np, "thermal-info", NULL);
493 of_node_put(np);
494
495 if( !info || !of_machine_is_compatible("PowerMac3,6") )
496 return -ENODEV;
497
498 if( info->id != 3 ) {
499 printk(KERN_ERR "therm_windtunnel: unsupported thermal design %d\n", info->id );
500 return -ENODEV;
501 }
502 if( !(np=of_find_node_by_name(NULL, "fan")) )
503 return -ENODEV;
504 x.of_dev = of_platform_device_create(np, "temperature", NULL);
505 of_node_put( np );
506
507 if( !x.of_dev ) {
508 printk(KERN_ERR "Can't register fan controller!\n");
509 return -ENODEV;
510 }
511
512 of_register_platform_driver( &therm_of_driver );
513 return 0;
514}
515
516static void __exit
517g4fan_exit( void )
518{
519 of_unregister_platform_driver( &therm_of_driver );
520
521 if( x.of_dev )
522 of_device_unregister( x.of_dev );
523}
524
525module_init(g4fan_init);
526module_exit(g4fan_exit);
527
528MODULE_AUTHOR("Samuel Rydh <samuel@ibrium.se>");
529MODULE_DESCRIPTION("Apple G4 (windtunnel) fan controller");
530MODULE_LICENSE("GPL");
531
