blob: 0839770e4ec54faa6c742c4c7f06ac81fecb7080 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
André Goddard Rosaaf901ca2009-11-14 13:09:05 -020018 * temperature around 57 C.
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/init.h>
Paul Mackerras98f67402007-12-13 15:57:45 +110038#include <linux/kthread.h>
Stephen Rothwellad9e05a2008-05-23 16:27:02 +100039#include <linux/of_platform.h>
Benjamin Herrenschmidt7eebde72006-11-11 17:24:59 +110040
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <asm/prom.h>
42#include <asm/machdep.h>
43#include <asm/io.h>
44#include <asm/system.h>
45#include <asm/sections.h>
Jeff Mahoney5e655772005-07-06 15:44:41 -040046#include <asm/macio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#define LOG_TEMP 0 /* continously log temperature */
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050static struct {
51 volatile int running;
Paul Mackerras98f67402007-12-13 15:57:45 +110052 struct task_struct *poll_task;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Daniel Walker1baaeea2008-06-10 09:26:08 +100054 struct mutex lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 struct of_device *of_dev;
56
57 struct i2c_client *thermostat;
58 struct i2c_client *fan;
59
60 int overheat_temp; /* 100% fan at this temp */
61 int overheat_hyst;
62 int temp;
63 int casetemp;
64 int fan_level; /* active fan_table setting */
65
66 int downind;
67 int upind;
68
69 int r0, r1, r20, r23, r25; /* saved register */
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 }, /* min fan */
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 } /* on fire */
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
Yani Ioannoue404e272005-05-17 06:42:58 -0400100show_cpu_temperature( struct device *dev, struct device_attribute *attr, char *buf )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
102 return sprintf(buf, "%d.%d\n", x.temp>>8, (x.temp & 255)*10/256 );
103}
104
105static ssize_t
Yani Ioannoue404e272005-05-17 06:42:58 -0400106show_case_temperature( struct device *dev, struct device_attribute *attr, char *buf )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107{
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/* controller thread */
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 /* write_reg( x.fan, 0x24, val, 1 ); */
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 /* this actually occurs when the computer is loaded */
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;
Stephen Rothwell98894df2008-01-03 15:15:28 +1100213 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
215 /* save registers (if we unload the module) */
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 /* improve measurement resolution (convergence time 1.5s) */
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 /* disable interrupts and TAC input */
229 write_reg( x.fan, 0x01, 0x01, 1 );
230 /* enable filter */
231 write_reg( x.fan, 0x23, 0x91, 1 );
232 /* remote temp. controls fan */
233 write_reg( x.fan, 0x00, 0x95, 1 );
234
235 /* The thermostat (which besides measureing temperature controls
236 * has a THERM output which puts the fan on 100%) is usually
237 * set to kick in at 80 C (chip default). We reduce this a bit
238 * to be on the safe side (OSX doesn't)...
239 */
240 if( x.overheat_temp == (80 << 8) ) {
Lyonel Vincentb8e4a7d2009-08-30 08:54:20 +0000241 x.overheat_temp = 75 << 8;
242 x.overheat_hyst = 70 << 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 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 /* set an initial fan setting */
252 x.downind = 0xffff;
253 x.upind = -1;
254 /* tune_fan( fan_up_table[x.upind].fan_setting ); */
255
Stephen Rothwell98894df2008-01-03 15:15:28 +1100256 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");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261}
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
Paul Mackerras98f67402007-12-13 15:57:45 +1100276static int control_loop(void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
Daniel Walker1baaeea2008-06-10 09:26:08 +1000278 mutex_lock(&x.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 setup_hardware();
Daniel Walker1baaeea2008-06-10 09:26:08 +1000280 mutex_unlock(&x.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
Paul Mackerras98f67402007-12-13 15:57:45 +1100282 for (;;) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 msleep_interruptible(8000);
Paul Mackerras98f67402007-12-13 15:57:45 +1100284 if (kthread_should_stop())
285 break;
286
Daniel Walker1baaeea2008-06-10 09:26:08 +1000287 mutex_lock(&x.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 poll_temp();
Daniel Walker1baaeea2008-06-10 09:26:08 +1000289 mutex_unlock(&x.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 }
291
Daniel Walker1baaeea2008-06-10 09:26:08 +1000292 mutex_lock(&x.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 restore_regs();
Daniel Walker1baaeea2008-06-10 09:26:08 +1000294 mutex_unlock(&x.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
Paul Mackerras98f67402007-12-13 15:57:45 +1100296 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297}
298
299
300/************************************************************************/
301/* i2c probing and setup */
302/************************************************************************/
303
304static int
305do_attach( struct i2c_adapter *adapter )
306{
Jean Delvare036533e2009-06-15 18:01:52 +0200307 /* scan 0x48-0x4f (DS1775) and 0x2c-2x2f (ADM1030) */
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 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
317 if( strncmp(adapter->name, "uni-n", 5) )
318 return 0;
319
320 if( !x.running ) {
Jean Delvare036533e2009-06-15 18:01:52 +0200321 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);
326
327 strlcpy(info.type, "therm_adm1030", I2C_NAME_SIZE);
328 i2c_new_probed_device(adapter, &info, scan_adm1030);
329
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 if( x.thermostat && x.fan ) {
331 x.running = 1;
Paul Mackerras98f67402007-12-13 15:57:45 +1100332 x.poll_task = kthread_run(control_loop, NULL, "g4fand");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 }
334 }
Jean Delvare036533e2009-06-15 18:01:52 +0200335 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336}
337
338static int
Jean Delvare036533e2009-06-15 18:01:52 +0200339do_remove(struct i2c_client *client)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340{
Jean Delvare036533e2009-06-15 18:01:52 +0200341 if (x.running) {
342 x.running = 0;
343 kthread_stop(x.poll_task);
344 x.poll_task = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 }
Jean Delvare036533e2009-06-15 18:01:52 +0200346 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");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
Jean Delvare036533e2009-06-15 18:01:52 +0200353 return 0;
354}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356static int
357attach_fan( struct i2c_client *cl )
358{
359 if( x.fan )
360 goto out;
361
362 /* check that this is an ADM1030 */
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
Jean Delvare036533e2009-06-15 18:01:52 +0200367 x.fan = cl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 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 /* temperature sanity check */
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;
Jean Delvare036533e2009-06-15 18:01:52 +0200400 x.thermostat = cl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 return 0;
403}
404
Jean Delvare036533e2009-06-15 18:01:52 +0200405enum chip { ds1775, adm1030 };
406
407static const struct i2c_device_id therm_windtunnel_id[] = {
408 { "therm_ds1775", ds1775 },
409 { "therm_adm1030", adm1030 },
410 { }
411};
412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413static int
Jean Delvare036533e2009-06-15 18:01:52 +0200414do_probe(struct i2c_client *cl, const struct i2c_device_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415{
Jean Delvare036533e2009-06-15 18:01:52 +0200416 struct i2c_adapter *adapter = cl->adapter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
418 if( !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA
419 | I2C_FUNC_SMBUS_WRITE_BYTE) )
420 return 0;
421
Jean Delvare036533e2009-06-15 18:01:52 +0200422 switch (id->driver_data) {
423 case adm1030:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 return attach_fan( cl );
Jean Delvare036533e2009-06-15 18:01:52 +0200425 case ds1775:
426 return attach_thermostat(cl);
427 }
428 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429}
430
Jean Delvare036533e2009-06-15 18:01:52 +0200431static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
442/************************************************************************/
443/* initialization / cleanup */
444/************************************************************************/
445
446static int
Jeff Mahoney5e655772005-07-06 15:44:41 -0400447therm_of_probe( struct of_device *dev, const struct of_device_id *match )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448{
449 return i2c_add_driver( &g4fan_driver );
450}
451
452static int
453therm_of_remove( struct of_device *dev )
454{
Jean Delvareb3e82092007-05-01 23:26:32 +0200455 i2c_del_driver( &g4fan_driver );
456 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457}
458
Márton Németh46759a72010-01-10 01:43:14 +0000459static const struct of_device_id therm_of_match[] = {{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 .name = "fan",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 .compatible = "adm1030"
462 }, {}
463};
464
465static struct of_platform_driver therm_of_driver = {
466 .name = "temperature",
467 .match_table = therm_of_match,
468 .probe = therm_of_probe,
469 .remove = therm_of_remove,
470};
471
472struct apple_thermal_info {
473 u8 id; /* implementation ID */
474 u8 fan_count; /* number of fans */
475 u8 thermostat_count; /* number of thermostats */
476 u8 unused;
477};
478
479static int __init
480g4fan_init( void )
481{
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000482 const struct apple_thermal_info *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 struct device_node *np;
484
Daniel Walker1baaeea2008-06-10 09:26:08 +1000485 mutex_init(&x.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
487 if( !(np=of_find_node_by_name(NULL, "power-mgt")) )
488 return -ENODEV;
Stephen Rothwell01b27262007-04-27 13:41:15 +1000489 info = of_get_property(np, "thermal-info", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 of_node_put(np);
491
Grant Likely71a157e2010-02-01 21:34:14 -0700492 if( !info || !of_machine_is_compatible("PowerMac3,6") )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 return -ENODEV;
494
495 if( info->id != 3 ) {
496 printk(KERN_ERR "therm_windtunnel: unsupported thermal design %d\n", info->id );
497 return -ENODEV;
498 }
499 if( !(np=of_find_node_by_name(NULL, "fan")) )
500 return -ENODEV;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700501 x.of_dev = of_platform_device_create(np, "temperature", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 of_node_put( np );
503
504 if( !x.of_dev ) {
505 printk(KERN_ERR "Can't register fan controller!\n");
506 return -ENODEV;
507 }
508
Benjamin Herrenschmidt7eebde72006-11-11 17:24:59 +1100509 of_register_platform_driver( &therm_of_driver );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 return 0;
511}
512
513static void __exit
514g4fan_exit( void )
515{
Benjamin Herrenschmidt7eebde72006-11-11 17:24:59 +1100516 of_unregister_platform_driver( &therm_of_driver );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
518 if( x.of_dev )
519 of_device_unregister( x.of_dev );
520}
521
522module_init(g4fan_init);
523module_exit(g4fan_exit);
524
525MODULE_AUTHOR("Samuel Rydh <samuel@ibrium.se>");
526MODULE_DESCRIPTION("Apple G4 (windtunnel) fan controller");
527MODULE_LICENSE("GPL");