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30#include <linux/config.h>
31#include <linux/types.h>
32#include <linux/module.h>
33#include <linux/errno.h>
34#include <linux/kernel.h>
35#include <linux/delay.h>
36#include <linux/sched.h>
37#include <linux/i2c.h>
38#include <linux/slab.h>
39#include <linux/init.h>
40#include <asm/prom.h>
41#include <asm/machdep.h>
42#include <asm/io.h>
43#include <asm/system.h>
44#include <asm/sections.h>
45#include <asm/of_device.h>
46
47#define LOG_TEMP 0
48
49#define I2C_DRIVERID_G4FAN 0x9001
50#define THERMOSTAT_CLIENT_ID 1
51#define FAN_CLIENT_ID 2
52
53static int do_probe( struct i2c_adapter *adapter, int addr, int kind);
54
55
56static unsigned short normal_i2c[] = { 0x49, 0x2c, I2C_CLIENT_END };
57static unsigned short normal_i2c_range[] = { 0x48, 0x4f, 0x2c, 0x2f, I2C_CLIENT_END };
58
59I2C_CLIENT_INSMOD;
60
61static struct {
62 volatile int running;
63 struct completion completion;
64 pid_t poll_task;
65
66 struct semaphore lock;
67 struct of_device *of_dev;
68
69 struct i2c_client *thermostat;
70 struct i2c_client *fan;
71
72 int overheat_temp;
73 int overheat_hyst;
74 int temp;
75 int casetemp;
76 int fan_level;
77
78 int downind;
79 int upind;
80
81 int r0, r1, r20, r23, r25;
82} x;
83
84#define T(x,y) (((x)<<8) | (y)*0x100/10 )
85
86static struct {
87 int fan_down_setting;
88 int temp;
89 int fan_up_setting;
90} fan_table[] = {
91 { 11, T(0,0), 11 },
92 { 11, T(55,0), 11 },
93 { 6, T(55,3), 11 },
94 { 7, T(56,0), 11 },
95 { 8, T(57,0), 8 },
96 { 7, T(58,3), 7 },
97 { 6, T(58,8), 6 },
98 { 5, T(59,2), 5 },
99 { 4, T(59,6), 4 },
100 { 3, T(59,9), 3 },
101 { 2, T(60,1), 2 },
102 { 1, 0xfffff, 1 }
103};
104
105static void
106print_temp( const char *s, int temp )
107{
108 printk("%s%d.%d C", s ? s : "", temp>>8, (temp & 255)*10/256 );
109}
110
111static ssize_t
112show_cpu_temperature( struct device *dev, char *buf )
113{
114 return sprintf(buf, "%d.%d\n", x.temp>>8, (x.temp & 255)*10/256 );
115}
116
117static ssize_t
118show_case_temperature( struct device *dev, char *buf )
119{
120 return sprintf(buf, "%d.%d\n", x.casetemp>>8, (x.casetemp & 255)*10/256 );
121}
122
123static DEVICE_ATTR(cpu_temperature, S_IRUGO, show_cpu_temperature, NULL );
124static DEVICE_ATTR(case_temperature, S_IRUGO, show_case_temperature, NULL );
125
126
127
128
129
130
131
132static int
133write_reg( struct i2c_client *cl, int reg, int data, int len )
134{
135 u8 tmp[3];
136
137 if( len < 1 || len > 2 || data < 0 )
138 return -EINVAL;
139
140 tmp[0] = reg;
141 tmp[1] = (len == 1) ? data : (data >> 8);
142 tmp[2] = data;
143 len++;
144
145 if( i2c_master_send(cl, tmp, len) != len )
146 return -ENODEV;
147 return 0;
148}
149
150static int
151read_reg( struct i2c_client *cl, int reg, int len )
152{
153 u8 buf[2];
154
155 if( len != 1 && len != 2 )
156 return -EINVAL;
157 buf[0] = reg;
158 if( i2c_master_send(cl, buf, 1) != 1 )
159 return -ENODEV;
160 if( i2c_master_recv(cl, buf, len) != len )
161 return -ENODEV;
162 return (len == 2)? ((unsigned int)buf[0] << 8) | buf[1] : buf[0];
163}
164
165static void
166tune_fan( int fan_setting )
167{
168 int val = (fan_setting << 3) | 7;
169
170
171 write_reg( x.fan, 0x25, val, 1 );
172 write_reg( x.fan, 0x20, 0, 1 );
173 print_temp("CPU-temp: ", x.temp );
174 if( x.casetemp )
175 print_temp(", Case: ", x.casetemp );
176 printk(", Fan: %d (tuned %+d)\n", 11-fan_setting, x.fan_level-fan_setting );
177
178 x.fan_level = fan_setting;
179}
180
181static void
182poll_temp( void )
183{
184 int temp, i, level, casetemp;
185
186 temp = read_reg( x.thermostat, 0, 2 );
187
188
189 if( temp < 0 )
190 return;
191
192 casetemp = read_reg(x.fan, 0x0b, 1) << 8;
193 casetemp |= (read_reg(x.fan, 0x06, 1) & 0x7) << 5;
194
195 if( LOG_TEMP && x.temp != temp ) {
196 print_temp("CPU-temp: ", temp );
197 print_temp(", Case: ", casetemp );
198 printk(", Fan: %d\n", 11-x.fan_level );
199 }
200 x.temp = temp;
201 x.casetemp = casetemp;
202
203 level = -1;
204 for( i=0; (temp & 0xffff) > fan_table[i].temp ; i++ )
205 ;
206 if( i < x.downind )
207 level = fan_table[i].fan_down_setting;
208 x.downind = i;
209
210 for( i=0; (temp & 0xffff) >= fan_table[i+1].temp ; i++ )
211 ;
212 if( x.upind < i )
213 level = fan_table[i].fan_up_setting;
214 x.upind = i;
215
216 if( level >= 0 )
217 tune_fan( level );
218}
219
220
221static void
222setup_hardware( void )
223{
224 int val;
225
226
227 x.r0 = read_reg( x.fan, 0x00, 1 );
228 x.r1 = read_reg( x.fan, 0x01, 1 );
229 x.r20 = read_reg( x.fan, 0x20, 1 );
230 x.r23 = read_reg( x.fan, 0x23, 1 );
231 x.r25 = read_reg( x.fan, 0x25, 1 );
232
233
234 if( (val=read_reg(x.thermostat, 1, 1)) >= 0 ) {
235 val |= 0x60;
236 if( write_reg( x.thermostat, 1, val, 1 ) )
237 printk("Failed writing config register\n");
238 }
239
240 write_reg( x.fan, 0x01, 0x01, 1 );
241
242 write_reg( x.fan, 0x23, 0x91, 1 );
243
244 write_reg( x.fan, 0x00, 0x95, 1 );
245
246
247
248
249
250
251 if( x.overheat_temp == (80 << 8) ) {
252 x.overheat_temp = 65 << 8;
253 x.overheat_hyst = 60 << 8;
254 write_reg( x.thermostat, 2, x.overheat_hyst, 2 );
255 write_reg( x.thermostat, 3, x.overheat_temp, 2 );
256
257 print_temp("Reducing overheating limit to ", x.overheat_temp );
258 print_temp(" (Hyst: ", x.overheat_hyst );
259 printk(")\n");
260 }
261
262
263 x.downind = 0xffff;
264 x.upind = -1;
265
266
267 device_create_file( &x.of_dev->dev, &dev_attr_cpu_temperature );
268 device_create_file( &x.of_dev->dev, &dev_attr_case_temperature );
269}
270
271static void
272restore_regs( void )
273{
274 device_remove_file( &x.of_dev->dev, &dev_attr_cpu_temperature );
275 device_remove_file( &x.of_dev->dev, &dev_attr_case_temperature );
276
277 write_reg( x.fan, 0x01, x.r1, 1 );
278 write_reg( x.fan, 0x20, x.r20, 1 );
279 write_reg( x.fan, 0x23, x.r23, 1 );
280 write_reg( x.fan, 0x25, x.r25, 1 );
281 write_reg( x.fan, 0x00, x.r0, 1 );
282}
283
284static int
285control_loop( void *dummy )
286{
287 daemonize("g4fand");
288
289 down( &x.lock );
290 setup_hardware();
291
292 while( x.running ) {
293 up( &x.lock );
294
295 set_current_state(TASK_INTERRUPTIBLE);
296 schedule_timeout( 8*HZ );
297
298 down( &x.lock );
299 poll_temp();
300 }
301
302 restore_regs();
303 up( &x.lock );
304
305 complete_and_exit( &x.completion, 0 );
306}
307
308
309
310
311
312
313static int
314do_attach( struct i2c_adapter *adapter )
315{
316 int ret = 0;
317
318 if( strncmp(adapter->name, "uni-n", 5) )
319 return 0;
320
321 if( !x.running ) {
322 ret = i2c_probe( adapter, &addr_data, &do_probe );
323 if( x.thermostat && x.fan ) {
324 x.running = 1;
325 init_completion( &x.completion );
326 x.poll_task = kernel_thread( control_loop, NULL, SIGCHLD | CLONE_KERNEL );
327 }
328 }
329 return ret;
330}
331
332static int
333do_detach( struct i2c_client *client )
334{
335 int err;
336
337 if( (err=i2c_detach_client(client)) )
338 printk(KERN_ERR "failed to detach thermostat client\n");
339 else {
340 if( x.running ) {
341 x.running = 0;
342 wait_for_completion( &x.completion );
343 }
344 if( client == x.thermostat )
345 x.thermostat = NULL;
346 else if( client == x.fan )
347 x.fan = NULL;
348 else {
349 printk(KERN_ERR "g4fan: bad client\n");
350 }
351 kfree( client );
352 }
353 return err;
354}
355
356static struct i2c_driver g4fan_driver = {
357 .name = "Apple G4 Thermostat/Fan",
358 .id = I2C_DRIVERID_G4FAN,
359 .flags = I2C_DF_NOTIFY,
360 .attach_adapter = &do_attach,
361 .detach_client = &do_detach,
362 .command = NULL,
363};
364
365static int
366attach_fan( struct i2c_client *cl )
367{
368 if( x.fan )
369 goto out;
370
371
372 if( read_reg(cl, 0x3d, 1) != 0x30 || read_reg(cl, 0x3e, 1) != 0x41 )
373 goto out;
374 printk("ADM1030 fan controller [@%02x]\n", cl->addr );
375
376 cl->id = FAN_CLIENT_ID;
377 strlcpy( cl->name, "ADM1030 fan controller", sizeof(cl->name) );
378
379 if( !i2c_attach_client(cl) )
380 x.fan = cl;
381 out:
382 if( cl != x.fan )
383 kfree( cl );
384 return 0;
385}
386
387static int
388attach_thermostat( struct i2c_client *cl )
389{
390 int hyst_temp, os_temp, temp;
391
392 if( x.thermostat )
393 goto out;
394
395 if( (temp=read_reg(cl, 0, 2)) < 0 )
396 goto out;
397
398
399 if( temp < 0x1600 || temp > 0x3c00 )
400 goto out;
401 hyst_temp = read_reg(cl, 2, 2);
402 os_temp = read_reg(cl, 3, 2);
403 if( hyst_temp < 0 || os_temp < 0 )
404 goto out;
405
406 printk("DS1775 digital thermometer [@%02x]\n", cl->addr );
407 print_temp("Temp: ", temp );
408 print_temp(" Hyst: ", hyst_temp );
409 print_temp(" OS: ", os_temp );
410 printk("\n");
411
412 x.temp = temp;
413 x.overheat_temp = os_temp;
414 x.overheat_hyst = hyst_temp;
415
416 cl->id = THERMOSTAT_CLIENT_ID;
417 strlcpy( cl->name, "DS1775 thermostat", sizeof(cl->name) );
418
419 if( !i2c_attach_client(cl) )
420 x.thermostat = cl;
421out:
422 if( cl != x.thermostat )
423 kfree( cl );
424 return 0;
425}
426
427static int
428do_probe( struct i2c_adapter *adapter, int addr, int kind )
429{
430 struct i2c_client *cl;
431
432 if( !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA
433 | I2C_FUNC_SMBUS_WRITE_BYTE) )
434 return 0;
435
436 if( !(cl=kmalloc(sizeof(*cl), GFP_KERNEL)) )
437 return -ENOMEM;
438 memset( cl, 0, sizeof(struct i2c_client) );
439
440 cl->addr = addr;
441 cl->adapter = adapter;
442 cl->driver = &g4fan_driver;
443 cl->flags = 0;
444
445 if( addr < 0x48 )
446 return attach_fan( cl );
447 return attach_thermostat( cl );
448}
449
450
451
452
453
454
455static int
456therm_of_probe( struct of_device *dev, const struct of_match *match )
457{
458 return i2c_add_driver( &g4fan_driver );
459}
460
461static int
462therm_of_remove( struct of_device *dev )
463{
464 return i2c_del_driver( &g4fan_driver );
465}
466
467static struct of_match therm_of_match[] = {{
468 .name = "fan",
469 .type = OF_ANY_MATCH,
470 .compatible = "adm1030"
471 }, {}
472};
473
474static struct of_platform_driver therm_of_driver = {
475 .name = "temperature",
476 .match_table = therm_of_match,
477 .probe = therm_of_probe,
478 .remove = therm_of_remove,
479};
480
481struct apple_thermal_info {
482 u8 id;
483 u8 fan_count;
484 u8 thermostat_count;
485 u8 unused;
486};
487
488static int __init
489g4fan_init( void )
490{
491 struct apple_thermal_info *info;
492 struct device_node *np;
493
494 init_MUTEX( &x.lock );
495
496 if( !(np=of_find_node_by_name(NULL, "power-mgt")) )
497 return -ENODEV;
498 info = (struct apple_thermal_info*)get_property(np, "thermal-info", NULL);
499 of_node_put(np);
500
501 if( !info || !machine_is_compatible("PowerMac3,6") )
502 return -ENODEV;
503
504 if( info->id != 3 ) {
505 printk(KERN_ERR "therm_windtunnel: unsupported thermal design %d\n", info->id );
506 return -ENODEV;
507 }
508 if( !(np=of_find_node_by_name(NULL, "fan")) )
509 return -ENODEV;
510 x.of_dev = of_platform_device_create( np, "temperature" );
511 of_node_put( np );
512
513 if( !x.of_dev ) {
514 printk(KERN_ERR "Can't register fan controller!\n");
515 return -ENODEV;
516 }
517
518 of_register_driver( &therm_of_driver );
519 return 0;
520}
521
522static void __exit
523g4fan_exit( void )
524{
525 of_unregister_driver( &therm_of_driver );
526
527 if( x.of_dev )
528 of_device_unregister( x.of_dev );
529}
530
531module_init(g4fan_init);
532module_exit(g4fan_exit);
533
534MODULE_AUTHOR("Samuel Rydh <samuel@ibrium.se>");
535MODULE_DESCRIPTION("Apple G4 (windtunnel) fan controller");
536MODULE_LICENSE("GPL");
537
