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Commit 67bfb5a7 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
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[PATCH] pmac: Improved G4 "windtunnel" fan controller 

This is an improved version of the G4 "windtunnel" fan controller.  It
depends on the keywest bugfix...
parent f5dcac2b
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Showing with 276 additions and 196 deletions
drivers/macintosh/therm_windtunnel.c
View file @ 67bfb5a7
/*
* Creation Date: <2003/03/14 20:54:13 samuel>
* Time-stamp: <2003/03/15 18:55:53 samuel>
* Time-stamp: <2004/03/20 14:20:59 samuel>
*
* <therm_windtunnel.c>
*
* The G4 "windtunnel" has a single fan controlled by a
* DS1775 fan controller and an ADM1030 thermostat.
* The G4 "windtunnel" has a single fan controlled by an
* ADM1030 fan controller and a DS1775 thermostat.
*
* The fan controller is equipped with a temperature sensor
* which measures the case temperature. The ADM censor
* which measures the case temperature. The DS1775 sensor
* measures the CPU temperature. This driver tunes the
* behavior of the fan. It is based upon empirical observations
* of the 'AppleFan' driver under OSX.
* of the 'AppleFan' driver under Mac OS X.
*
* WARNING: This driver has only been testen on Apple's
* 1.25 MHz Dual G4 (March 03). Other machines might have
* a different thermal design. It is tuned for a CPU
* 1.25 MHz Dual G4 (March 03). It is tuned for a CPU
* temperatur around 57 C.
*
* Copyright (C) 2003 Samuel Rydh (samuel@ibrium.se)
* Copyright (C) 2003, 2004 Samuel Rydh (samuel@ibrium.se)
*
* Loosely based upon 'thermostat.c' written by Benjamin Herrenschmidt
*
......@@ -38,50 +37,37 @@
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/workqueue.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/sections.h>
MODULE_AUTHOR("Samuel Rydh <samuel@ibrium.se>");
MODULE_DESCRIPTION("Apple G4 (windtunnel) fan driver");
MODULE_LICENSE("GPL");
#include <asm/of_device.h>
#define LOG_TEMP 0 /* continously log temperature */
/* scan 0x48-0x4f (DS1775) and 0x2c-2x2f (ADM1030) */
static unsigned short normal_i2c[] = { 0x49, 0x2c, I2C_CLIENT_END };
static unsigned short normal_i2c_range[] = { 0x48, 0x4f, 0x2c, 0x2f, I2C_CLIENT_END };
static struct work_struct poll_work;
I2C_CLIENT_INSMOD;
#define I2C_DRIVERID_G4FAN 0x9001 /* fixme */
#define THERMOSTAT_CLIENT_ID 1
#define FAN_CLIENT_ID 2
struct temp_range {
u8 high; /* start the fan */
u8 low; /* stop the fan */
};
struct apple_thermal_info {
u8 id; /* implementation ID */
u8 fan_count; /* number of fans */
u8 thermostat_count; /* number of thermostats */
u8 unused[5];
struct temp_range ranges[4]; /* temperature ranges (may be [])*/
};
static int do_probe( struct i2c_adapter *adapter, int addr, int kind);
static int do_detect( struct i2c_adapter *adapter, int addr, int kind);
/* scan 0x48-0x4f (DS1775) and 0x2c-2x2f (ADM1030) */
static unsigned short normal_i2c[] = { 0x49, 0x2c, I2C_CLIENT_END };
static unsigned short normal_i2c_range[] = { 0x48, 0x4f, 0x2c, 0x2f, I2C_CLIENT_END };
I2C_CLIENT_INSMOD;
static struct {
volatile int running;
struct completion completion;
pid_t poll_task;
struct semaphore lock;
struct of_device *of_dev;
struct i2c_client *thermostat;
struct i2c_client *fan;
int error;
struct timer_list timer;
int overheat_temp; /* 100% fan at this temp */
int overheat_hyst;
......@@ -95,37 +81,54 @@ static struct {
int r0, r1, r20, r23, r25; /* saved register */
} x;
#define T(x,y) (((x)<<8) | (y)*0x100/10 )
static struct {
int fan_down_setting;
int temp;
int fan_setting;
} fan_up_table[] = {
{ 0x0000, 11 }, /* min fan */
{ 0x3900, 8 }, /* 57.0 C */
{ 0x3a4a, 7 }, /* 58.3 C */
{ 0x3ad3, 6 }, /* 58.8 C */
{ 0x3b3c, 5 }, /* 59.2 C */
{ 0x3b94, 4 }, /* 59.6 C */
{ 0x3be3, 3 }, /* 58.9 C */
{ 0x3c29, 2 }, /* 59.2 C */
{ 0xffff, 1 } /* on fire */
};
static struct {
int temp;
int fan_setting;
} fan_down_table[] = {
{ 0x3700, 11 }, /* 55.0 C */
{ 0x374a, 6 },
{ 0x3800, 7 }, /* 56.0 C */
{ 0x3900, 8 }, /* 57.0 C */
{ 0x3a4a, 7 }, /* 58.3 C */
{ 0x3ad3, 6 }, /* 58.8 C */
{ 0x3b3c, 5 }, /* 59.2 C */
{ 0x3b94, 4 }, /* 58.9 C */
{ 0x3be3, 3 }, /* 58.9 C */
{ 0x3c29, 2 }, /* 59.2 C */
{ 0xffff, 1 }
int fan_up_setting;
} fan_table[] = {
{ 11, T(0,0), 11 }, /* min fan */
{ 11, T(55,0), 11 },
{ 6, T(55,3), 11 },
{ 7, T(56,0), 11 },
{ 8, T(57,0), 8 },
{ 7, T(58,3), 7 },
{ 6, T(58,8), 6 },
{ 5, T(59,2), 5 },
{ 4, T(59,6), 4 },
{ 3, T(59,9), 3 },
{ 2, T(60,1), 2 },
{ 1, 0xfffff, 1 } /* on fire */
};
static void
print_temp( const char *s, int temp )
{
printk("%s%d.%d C", s ? s : "", temp>>8, (temp & 255)*10/256 );
}
static ssize_t
show_cpu_temperature( struct device *dev, char *buf )
{
return sprintf(buf, "%d.%d\n", x.temp>>8, (x.temp & 255)*10/256 );
}
static ssize_t
show_case_temperature( struct device *dev, char *buf )
{
return sprintf(buf, "%d.%d\n", x.casetemp>>8, (x.casetemp & 255)*10/256 );
}
static DEVICE_ATTR(cpu_temperature, S_IRUGO, show_cpu_temperature, NULL );
static DEVICE_ATTR(case_temperature, S_IRUGO, show_case_temperature, NULL );
/************************************************************************/
/* controller thread */
/************************************************************************/
static int
write_reg( struct i2c_client *cl, int reg, int data, int len )
{
......@@ -159,37 +162,32 @@ read_reg( struct i2c_client *cl, int reg, int len )
return (len == 2)? ((unsigned int)buf[0] << 8) | buf[1] : buf[0];
}
static void
print_temp( const char *s, int temp )
{
printk("%s%d.%d C", s ? s : "", temp>>8, (temp & 255)*10/256 );
}
static void
tune_fan( int fan_setting )
{
int val = (fan_setting << 3) | 7;
x.fan_level = fan_setting;
//write_reg( x.fan, 0x24, val, 1 );
/* write_reg( x.fan, 0x24, val, 1 ); */
write_reg( x.fan, 0x25, val, 1 );
write_reg( x.fan, 0x20, 0, 1 );
print_temp("CPU-temp: ", x.temp );
if( x.casetemp )
print_temp(", Case: ", x.casetemp );
printk(" Tuning fan: %d (%02x)\n", fan_setting, val );
printk(", Fan: %d (tuned %+d)\n", 11-fan_setting, x.fan_level-fan_setting );
x.fan_level = fan_setting;
}
static void
poll_temp( void *param )
poll_temp( void )
{
int temp = read_reg( x.thermostat, 0, 2 );
int i, level, casetemp;
int temp, i, level, casetemp;
temp = read_reg( x.thermostat, 0, 2 );
/* this actually occurs when the computer is loaded */
if( temp < 0 )
goto out;
return;
casetemp = read_reg(x.fan, 0x0b, 1) << 8;
casetemp |= (read_reg(x.fan, 0x06, 1) & 0x7) << 5;
......@@ -197,37 +195,117 @@ poll_temp( void *param )
if( LOG_TEMP && x.temp != temp ) {
print_temp("CPU-temp: ", temp );
print_temp(", Case: ", casetemp );
printk(", Fan: %d\n", x.fan_level );
printk(", Fan: %d\n", 11-x.fan_level );
}
x.temp = temp;
x.casetemp = casetemp;
level = -1;
for( i=0; (temp & 0xffff) > fan_down_table[i].temp ; i++ )
for( i=0; (temp & 0xffff) > fan_table[i].temp ; i++ )
;
if( i < x.downind )
level = fan_down_table[i].fan_setting;
level = fan_table[i].fan_down_setting;
x.downind = i;
for( i=0; (temp & 0xfffe) >= fan_up_table[i+1].temp ; i++ )
for( i=0; (temp & 0xffff) >= fan_table[i+1].temp ; i++ )
;
if( x.upind < i )
level = fan_up_table[i].fan_setting;
level = fan_table[i].fan_up_setting;
x.upind = i;
if( level >= 0 )
tune_fan( level );
out:
x.timer.expires = jiffies + 8*HZ;
add_timer( &x.timer );
}
static void
setup_hardware( void )
{
int val;
/* save registers (if we unload the module) */
x.r0 = read_reg( x.fan, 0x00, 1 );
x.r1 = read_reg( x.fan, 0x01, 1 );
x.r20 = read_reg( x.fan, 0x20, 1 );
x.r23 = read_reg( x.fan, 0x23, 1 );
x.r25 = read_reg( x.fan, 0x25, 1 );
/* improve measurement resolution (convergence time 1.5s) */
if( (val=read_reg(x.thermostat, 1, 1)) >= 0 ) {
val |= 0x60;
if( write_reg( x.thermostat, 1, val, 1 ) )
printk("Failed writing config register\n");
}
/* disable interrupts and TAC input */
write_reg( x.fan, 0x01, 0x01, 1 );
/* enable filter */
write_reg( x.fan, 0x23, 0x91, 1 );
/* remote temp. controls fan */
write_reg( x.fan, 0x00, 0x95, 1 );
/* The thermostat (which besides measureing temperature controls
* has a THERM output which puts the fan on 100%) is usually
* set to kick in at 80 C (chip default). We reduce this a bit
* to be on the safe side (OSX doesn't)...
*/
if( x.overheat_temp == (80 << 8) ) {
x.overheat_temp = 65 << 8;
x.overheat_hyst = 60 << 8;
write_reg( x.thermostat, 2, x.overheat_hyst, 2 );
write_reg( x.thermostat, 3, x.overheat_temp, 2 );
print_temp("Reducing overheating limit to ", x.overheat_temp );
print_temp(" (Hyst: ", x.overheat_hyst );
printk(")\n");
}
/* set an initial fan setting */
x.downind = 0xffff;
x.upind = -1;
/* tune_fan( fan_up_table[x.upind].fan_setting ); */
device_create_file( &x.of_dev->dev, &dev_attr_cpu_temperature );
device_create_file( &x.of_dev->dev, &dev_attr_case_temperature );
}
static void
schedule_poll( unsigned long t )
restore_regs( void )
{
schedule_work(&poll_work);
device_remove_file( &x.of_dev->dev, &dev_attr_cpu_temperature );
device_remove_file( &x.of_dev->dev, &dev_attr_case_temperature );
write_reg( x.fan, 0x01, x.r1, 1 );
write_reg( x.fan, 0x20, x.r20, 1 );
write_reg( x.fan, 0x23, x.r23, 1 );
write_reg( x.fan, 0x25, x.r25, 1 );
write_reg( x.fan, 0x00, x.r0, 1 );
}
static int
control_loop( void *dummy )
{
daemonize("g4fand");
down( &x.lock );
setup_hardware();
while( x.running ) {
up( &x.lock );
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout( 8*HZ );
down( &x.lock );
poll_temp();
}
restore_regs();
up( &x.lock );
complete_and_exit( &x.completion, 0 );
}
/************************************************************************/
/* i2c probing and setup */
/************************************************************************/
......@@ -235,7 +313,20 @@ schedule_poll( unsigned long t )
static int
do_attach( struct i2c_adapter *adapter )
{
return i2c_probe( adapter, &addr_data, &do_detect );
int ret = 0;
if( strncmp(adapter->name, "uni-n", 5) )
return 0;
if( !x.running ) {
ret = i2c_probe( adapter, &addr_data, &do_probe );
if( x.thermostat && x.fan ) {
x.running = 1;
init_completion( &x.completion );
x.poll_task = kernel_thread( control_loop, NULL, SIGCHLD | CLONE_KERNEL );
}
}
return ret;
}
static int
......@@ -243,13 +334,23 @@ do_detach( struct i2c_client *client )
{
int err;
printk("do_detach: id %d\n", client->id );
if( (err=i2c_detach_client(client)) ) {
printk("failed to detach thermostat client\n");
return err;
if( (err=i2c_detach_client(client)) )
printk(KERN_ERR "failed to detach thermostat client\n");
else {
if( x.running ) {
x.running = 0;
wait_for_completion( &x.completion );
}
if( client == x.thermostat )
x.thermostat = NULL;
else if( client == x.fan )
x.fan = NULL;
else {
printk(KERN_ERR "g4fan: bad client\n");
}
kfree( client );
}
kfree( client );
return 0;
return err;
}
static struct i2c_driver g4fan_driver = {
......@@ -262,24 +363,21 @@ static struct i2c_driver g4fan_driver = {
};
static int
detect_fan( struct i2c_client *cl )
attach_fan( struct i2c_client *cl )
{
if( x.fan )
goto out;
/* check that this is an ADM1030 */
if( read_reg(cl, 0x3d, 1) != 0x30 || read_reg(cl, 0x3e, 1) != 0x41 )
goto out;
printk("ADM1030 fan controller detected at %02x\n", cl->addr );
printk("ADM1030 fan controller [@%02x]\n", cl->addr );
if( x.fan ) {
x.error |= 2;
goto out;
}
x.fan = cl;
cl->id = FAN_CLIENT_ID;
strncpy( cl->name, "ADM1030 fan controller", sizeof(cl->name) );
strlcpy( cl->name, "ADM1030 fan controller", sizeof(cl->name) );
if( i2c_attach_client( cl ) )
goto out;
return 0;
if( !i2c_attach_client(cl) )
x.fan = cl;
out:
if( cl != x.fan )
kfree( cl );
......@@ -287,10 +385,13 @@ detect_fan( struct i2c_client *cl )
}
static int
detect_thermostat( struct i2c_client *cl )
attach_thermostat( struct i2c_client *cl )
{
int hyst_temp, os_temp, temp;
if( x.thermostat )
goto out;
if( (temp=read_reg(cl, 0, 2)) < 0 )
goto out;
......@@ -302,44 +403,37 @@ detect_thermostat( struct i2c_client *cl )
if( hyst_temp < 0 || os_temp < 0 )
goto out;
printk("DS1775 digital thermometer detected at %02x\n", cl->addr );
printk("DS1775 digital thermometer [@%02x]\n", cl->addr );
print_temp("Temp: ", temp );
print_temp(" Hyst: ", hyst_temp );
print_temp(" OS: ", os_temp );
printk("\n");
if( x.thermostat ) {
x.error |= 1;
goto out;
}
x.temp = temp;
x.thermostat = cl;
x.overheat_temp = os_temp;
x.overheat_hyst = hyst_temp;
cl->id = THERMOSTAT_CLIENT_ID;
strncpy( cl->name, "DS1775 thermostat", sizeof(cl->name) );
strlcpy( cl->name, "DS1775 thermostat", sizeof(cl->name) );
if( i2c_attach_client( cl ) )
goto out;
return 0;
if( !i2c_attach_client(cl) )
x.thermostat = cl;
out:
kfree( cl );
if( cl != x.thermostat )
kfree( cl );
return 0;
}
static int
do_detect( struct i2c_adapter *adapter, int addr, int kind )
do_probe( struct i2c_adapter *adapter, int addr, int kind )
{
struct i2c_client *cl;
if( strncmp(adapter->name, "uni-n", 5) )
return 0;
if( !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA
| I2C_FUNC_SMBUS_WRITE_BYTE) )
return 0;
if( !(cl=kmalloc( sizeof(struct i2c_client), GFP_KERNEL )) )
if( !(cl=kmalloc(sizeof(*cl), GFP_KERNEL)) )
return -ENOMEM;
memset( cl, 0, sizeof(struct i2c_client) );
......@@ -349,108 +443,94 @@ do_detect( struct i2c_adapter *adapter, int addr, int kind )
cl->flags = 0;
if( addr < 0x48 )
return detect_fan( cl );
return detect_thermostat( cl );
return attach_fan( cl );
return attach_thermostat( cl );
}
/************************************************************************/
/* initialization / cleanup */
/************************************************************************/
static int
therm_of_probe( struct of_device *dev, const struct of_match *match )
{
return i2c_add_driver( &g4fan_driver );
}
#define PRINT_REG( r ) printk("reg %02x = %02x\n", r, read_reg(x.fan, r, 1) )
static int
therm_of_remove( struct of_device *dev )
{
return i2c_del_driver( &g4fan_driver );
}
static struct of_match therm_of_match[] = {{
.name = "fan",
.type = OF_ANY_MATCH,
.compatible = "adm1030"
}, {}
};
static struct of_platform_driver therm_of_driver = {
.name = "temperature",
.match_table = therm_of_match,
.probe = therm_of_probe,
.remove = therm_of_remove,
};
struct apple_thermal_info {
u8 id; /* implementation ID */
u8 fan_count; /* number of fans */
u8 thermostat_count; /* number of thermostats */
u8 unused;
};
static int __init
g4fan_init( void )
{
struct apple_thermal_info *info;
struct device_node *np;
int ret, val;
np = of_find_node_by_name(NULL, "power-mgt");
if (np == NULL)
init_MUTEX( &x.lock );
if( !(np=of_find_node_by_name(NULL, "power-mgt")) )
return -ENODEV;
info = (struct apple_thermal_info*)get_property(np, "thermal-info", NULL);
of_node_put(np);
if (info == NULL)
return -ENODEV;
/* check for G4 "Windtunnel" SMP */
if( machine_is_compatible("PowerMac3,6") ) {
if( info->id != 3 ) {
printk(KERN_ERR "g4fan: design id %d unknown\n", info->id);
return -ENODEV;
}
} else {
printk(KERN_ERR "g4fan: unsupported machine type\n");
return -ENODEV;
}
if( (ret=i2c_add_driver(&g4fan_driver)) )
return ret;
if( !x.thermostat || !x.fan ) {
i2c_del_driver(&g4fan_driver );
if( !info || !machine_is_compatible("PowerMac3,6") )
return -ENODEV;
}
/* save registers (if we unload the module) */
x.r0 = read_reg( x.fan, 0x00, 1 );
x.r1 = read_reg( x.fan, 0x01, 1 );
x.r20 = read_reg( x.fan, 0x20, 1 );
x.r23 = read_reg( x.fan, 0x23, 1 );
x.r25 = read_reg( x.fan, 0x25, 1 );
/* improve measurement resolution (convergence time 1.5s) */
if( (val=read_reg( x.thermostat, 1, 1 )) >= 0 ) {
val |= 0x60;
if( write_reg( x.thermostat, 1, val, 1 ) )
printk("Failed writing config register\n");
if( info->id != 3 ) {
printk(KERN_ERR "therm_windtunnel: unsupported thermal design %d\n", info->id );
return -ENODEV;
}
/* disable interrupts and TAC input */
write_reg( x.fan, 0x01, 0x01, 1 );
/* enable filter */
write_reg( x.fan, 0x23, 0x91, 1 );
/* remote temp. controls fan */
write_reg( x.fan, 0x00, 0x95, 1 );
/* The thermostat (which besides measureing temperature controls
* has a THERM output which puts the fan on 100%) is usually
* set to kick in at 80 C (chip default). We reduce this a bit
* to be on the safe side (OSX doesn't)...
*/
if( x.overheat_temp == (80 << 8) ) {
x.overheat_temp = 65 << 8;
x.overheat_hyst = 60 << 8;
write_reg( x.thermostat, 2, x.overheat_hyst, 2 );
write_reg( x.thermostat, 3, x.overheat_temp, 2 );
if( !(np=of_find_node_by_name(NULL, "fan")) )
return -ENODEV;
x.of_dev = of_platform_device_create( np, "temperature" );
of_node_put( np );
print_temp("Reducing overheating limit to ", x.overheat_temp );
print_temp(" (Hyst: ", x.overheat_hyst );
printk(")\n");
if( !x.of_dev ) {
printk(KERN_ERR "Can't register fan controller!\n");
return -ENODEV;
}
/* set an initial fan setting */
x.upind = x.downind = 1;
tune_fan( fan_up_table[x.upind].fan_setting );
INIT_WORK(&poll_work, poll_temp, NULL);
init_timer( &x.timer );
x.timer.expires = jiffies + 8*HZ;
x.timer.function = schedule_poll;
add_timer( &x.timer );
of_register_driver( &therm_of_driver );
return 0;
}
static void __exit
g4fan_exit( void )
{
del_timer( &x.timer );
of_unregister_driver( &therm_of_driver );
write_reg( x.fan, 0x01, x.r1, 1 );
write_reg( x.fan, 0x20, x.r20, 1 );
write_reg( x.fan, 0x23, x.r23, 1 );
write_reg( x.fan, 0x25, x.r25, 1 );
write_reg( x.fan, 0x00, x.r0, 1 );
i2c_del_driver( &g4fan_driver );
if( x.of_dev )
of_device_unregister( x.of_dev );
}
module_init(g4fan_init);
module_exit(g4fan_exit);
MODULE_AUTHOR("Samuel Rydh <samuel@ibrium.se>");
MODULE_DESCRIPTION("Apple G4 (windtunnel) fan controller");
MODULE_LICENSE("GPL");
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