diff options
Diffstat (limited to 'drivers/macintosh/therm_windtunnel.c')
| -rw-r--r-- | drivers/macintosh/therm_windtunnel.c | 559 |
1 files changed, 559 insertions, 0 deletions
diff --git a/drivers/macintosh/therm_windtunnel.c b/drivers/macintosh/therm_windtunnel.c new file mode 100644 index 000000000..b8228ca40 --- /dev/null +++ b/drivers/macintosh/therm_windtunnel.c @@ -0,0 +1,559 @@ +/* + * Creation Date: <2003/03/14 20:54:13 samuel> + * Time-stamp: <2004/03/20 14:20:59 samuel> + * + * <therm_windtunnel.c> + * + * 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 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 Mac OS X. + * + * WARNING: This driver has only been testen on Apple's + * 1.25 MHz Dual G4 (March 03). It is tuned for a CPU + * temperature around 57 C. + * + * Copyright (C) 2003, 2004 Samuel Rydh (samuel@ibrium.se) + * + * Loosely based upon 'thermostat.c' written by Benjamin Herrenschmidt + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation + * + */ + +#include <linux/types.h> +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/sched.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/kthread.h> +#include <linux/of_platform.h> + +#include <asm/machdep.h> +#include <asm/io.h> +#include <asm/sections.h> +#include <asm/macio.h> + +#define LOG_TEMP 0 /* continuously log temperature */ + +static struct { + volatile int running; + struct task_struct *poll_task; + + struct mutex lock; + struct platform_device *of_dev; + + struct i2c_client *thermostat; + struct i2c_client *fan; + + int overheat_temp; /* 100% fan at this temp */ + int overheat_hyst; + int temp; + int casetemp; + int fan_level; /* active fan_table setting */ + + int downind; + int upind; + + 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_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, struct device_attribute *attr, 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, struct device_attribute *attr, 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 ) +{ + u8 tmp[3]; + + if( len < 1 || len > 2 || data < 0 ) + return -EINVAL; + + tmp[0] = reg; + tmp[1] = (len == 1) ? data : (data >> 8); + tmp[2] = data; + len++; + + if( i2c_master_send(cl, tmp, len) != len ) + return -ENODEV; + return 0; +} + +static int +read_reg( struct i2c_client *cl, int reg, int len ) +{ + u8 buf[2]; + + if( len != 1 && len != 2 ) + return -EINVAL; + buf[0] = reg; + if( i2c_master_send(cl, buf, 1) != 1 ) + return -ENODEV; + if( i2c_master_recv(cl, buf, len) != len ) + return -ENODEV; + return (len == 2)? ((unsigned int)buf[0] << 8) | buf[1] : buf[0]; +} + +static void +tune_fan( int fan_setting ) +{ + int val = (fan_setting << 3) | 7; + + /* 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(", Fan: %d (tuned %+d)\n", 11-fan_setting, x.fan_level-fan_setting ); + + x.fan_level = fan_setting; +} + +static void +poll_temp( void ) +{ + int temp, i, level, casetemp; + + temp = read_reg( x.thermostat, 0, 2 ); + + /* this actually occurs when the computer is loaded */ + if( temp < 0 ) + return; + + casetemp = read_reg(x.fan, 0x0b, 1) << 8; + casetemp |= (read_reg(x.fan, 0x06, 1) & 0x7) << 5; + + if( LOG_TEMP && x.temp != temp ) { + print_temp("CPU-temp: ", temp ); + print_temp(", Case: ", casetemp ); + printk(", Fan: %d\n", 11-x.fan_level ); + } + x.temp = temp; + x.casetemp = casetemp; + + level = -1; + for( i=0; (temp & 0xffff) > fan_table[i].temp ; i++ ) + ; + if( i < x.downind ) + level = fan_table[i].fan_down_setting; + x.downind = i; + + for( i=0; (temp & 0xffff) >= fan_table[i+1].temp ; i++ ) + ; + if( x.upind < i ) + level = fan_table[i].fan_up_setting; + x.upind = i; + + if( level >= 0 ) + tune_fan( level ); +} + + +static void +setup_hardware( void ) +{ + int val; + int err; + + /* 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 = 75 << 8; + x.overheat_hyst = 70 << 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 ); */ + + err = device_create_file( &x.of_dev->dev, &dev_attr_cpu_temperature ); + err |= device_create_file( &x.of_dev->dev, &dev_attr_case_temperature ); + if (err) + printk(KERN_WARNING + "Failed to create temperature attribute file(s).\n"); +} + +static void +restore_regs( void ) +{ + 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) +{ + mutex_lock(&x.lock); + setup_hardware(); + mutex_unlock(&x.lock); + + for (;;) { + msleep_interruptible(8000); + if (kthread_should_stop()) + break; + + mutex_lock(&x.lock); + poll_temp(); + mutex_unlock(&x.lock); + } + + mutex_lock(&x.lock); + restore_regs(); + mutex_unlock(&x.lock); + + return 0; +} + + +/************************************************************************/ +/* i2c probing and setup */ +/************************************************************************/ + +static void do_attach(struct i2c_adapter *adapter) +{ + struct i2c_board_info info = { }; + struct device_node *np; + + /* scan 0x48-0x4f (DS1775) and 0x2c-2x2f (ADM1030) */ + static const unsigned short scan_ds1775[] = { + 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, + I2C_CLIENT_END + }; + static const unsigned short scan_adm1030[] = { + 0x2c, 0x2d, 0x2e, 0x2f, + I2C_CLIENT_END + }; + + if (x.running || strncmp(adapter->name, "uni-n", 5)) + return; + + of_node_get(adapter->dev.of_node); + np = of_find_compatible_node(adapter->dev.of_node, NULL, "MAC,ds1775"); + if (np) { + of_node_put(np); + } else { + strscpy(info.type, "MAC,ds1775", I2C_NAME_SIZE); + i2c_new_scanned_device(adapter, &info, scan_ds1775, NULL); + } + + of_node_get(adapter->dev.of_node); + np = of_find_compatible_node(adapter->dev.of_node, NULL, "MAC,adm1030"); + if (np) { + of_node_put(np); + } else { + strscpy(info.type, "MAC,adm1030", I2C_NAME_SIZE); + i2c_new_scanned_device(adapter, &info, scan_adm1030, NULL); + } +} + +static void +do_remove(struct i2c_client *client) +{ + if (x.running) { + x.running = 0; + kthread_stop(x.poll_task); + x.poll_task = NULL; + } + if (client == x.thermostat) + x.thermostat = NULL; + else if (client == x.fan) + x.fan = NULL; + else + printk(KERN_ERR "g4fan: bad client\n"); +} + +static int +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 [@%02x]\n", cl->addr ); + + x.fan = cl; + out: + return 0; +} + +static int +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; + + /* temperature sanity check */ + if( temp < 0x1600 || temp > 0x3c00 ) + goto out; + hyst_temp = read_reg(cl, 2, 2); + os_temp = read_reg(cl, 3, 2); + if( hyst_temp < 0 || os_temp < 0 ) + goto out; + + printk("DS1775 digital thermometer [@%02x]\n", cl->addr ); + print_temp("Temp: ", temp ); + print_temp(" Hyst: ", hyst_temp ); + print_temp(" OS: ", os_temp ); + printk("\n"); + + x.temp = temp; + x.overheat_temp = os_temp; + x.overheat_hyst = hyst_temp; + x.thermostat = cl; +out: + return 0; +} + +enum chip { ds1775, adm1030 }; + +static const struct i2c_device_id therm_windtunnel_id[] = { + { "MAC,ds1775", ds1775 }, + { "MAC,adm1030", adm1030 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, therm_windtunnel_id); + +static int +do_probe(struct i2c_client *cl, const struct i2c_device_id *id) +{ + struct i2c_adapter *adapter = cl->adapter; + int ret = 0; + + if( !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA + | I2C_FUNC_SMBUS_WRITE_BYTE) ) + return 0; + + switch (id->driver_data) { + case adm1030: + ret = attach_fan(cl); + break; + case ds1775: + ret = attach_thermostat(cl); + break; + } + + if (!x.running && x.thermostat && x.fan) { + x.running = 1; + x.poll_task = kthread_run(control_loop, NULL, "g4fand"); + } + + return ret; +} + +static struct i2c_driver g4fan_driver = { + .driver = { + .name = "therm_windtunnel", + }, + .probe = do_probe, + .remove = do_remove, + .id_table = therm_windtunnel_id, +}; + + +/************************************************************************/ +/* initialization / cleanup */ +/************************************************************************/ + +static int therm_of_probe(struct platform_device *dev) +{ + struct i2c_adapter *adap; + int ret, i = 0; + + adap = i2c_get_adapter(0); + if (!adap) + return -EPROBE_DEFER; + + ret = i2c_add_driver(&g4fan_driver); + if (ret) { + i2c_put_adapter(adap); + return ret; + } + + /* We assume Macs have consecutive I2C bus numbers starting at 0 */ + while (adap) { + do_attach(adap); + if (x.running) + return 0; + i2c_put_adapter(adap); + adap = i2c_get_adapter(++i); + } + + return -ENODEV; +} + +static int +therm_of_remove( struct platform_device *dev ) +{ + i2c_del_driver( &g4fan_driver ); + return 0; +} + +static const struct of_device_id therm_of_match[] = {{ + .name = "fan", + .compatible = "adm1030" + }, {} +}; +MODULE_DEVICE_TABLE(of, therm_of_match); + +static struct platform_driver therm_of_driver = { + .driver = { + .name = "temperature", + .of_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 ) +{ + const struct apple_thermal_info *info; + struct device_node *np; + + mutex_init(&x.lock); + + if( !(np=of_find_node_by_name(NULL, "power-mgt")) ) + return -ENODEV; + info = of_get_property(np, "thermal-info", NULL); + of_node_put(np); + + if( !info || !of_machine_is_compatible("PowerMac3,6") ) + return -ENODEV; + + if( info->id != 3 ) { + printk(KERN_ERR "therm_windtunnel: unsupported thermal design %d\n", info->id ); + return -ENODEV; + } + if( !(np=of_find_node_by_name(NULL, "fan")) ) + return -ENODEV; + x.of_dev = of_platform_device_create(np, "temperature", NULL); + of_node_put( np ); + + if( !x.of_dev ) { + printk(KERN_ERR "Can't register fan controller!\n"); + return -ENODEV; + } + + platform_driver_register( &therm_of_driver ); + return 0; +} + +static void __exit +g4fan_exit( void ) +{ + platform_driver_unregister( &therm_of_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"); |