532 строки
12 KiB
C
532 строки
12 KiB
C
/*
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* Creation Date: <2003/03/14 20:54:13 samuel>
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* Time-stamp: <2004/03/20 14:20:59 samuel>
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*
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* <therm_windtunnel.c>
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*
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* The G4 "windtunnel" has a single fan controlled by an
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* ADM1030 fan controller and a DS1775 thermostat.
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*
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* The fan controller is equipped with a temperature sensor
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* which measures the case temperature. The DS1775 sensor
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* measures the CPU temperature. This driver tunes the
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* behavior of the fan. It is based upon empirical observations
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* of the 'AppleFan' driver under Mac OS X.
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*
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* WARNING: This driver has only been testen on Apple's
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* 1.25 MHz Dual G4 (March 03). It is tuned for a CPU
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* temperatur around 57 C.
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*
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* Copyright (C) 2003, 2004 Samuel Rydh (samuel@ibrium.se)
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*
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* Loosely based upon 'thermostat.c' written by Benjamin Herrenschmidt
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation
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*
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*/
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <asm/prom.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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#include <asm/system.h>
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#include <asm/sections.h>
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#include <asm/of_device.h>
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#define LOG_TEMP 0 /* continously log temperature */
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#define I2C_DRIVERID_G4FAN 0x9001 /* fixme */
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static int do_probe( struct i2c_adapter *adapter, int addr, int kind);
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/* scan 0x48-0x4f (DS1775) and 0x2c-2x2f (ADM1030) */
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static unsigned short normal_i2c[] = { 0x49, 0x2c, I2C_CLIENT_END };
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static unsigned short normal_i2c_range[] = { 0x48, 0x4f, 0x2c, 0x2f, I2C_CLIENT_END };
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I2C_CLIENT_INSMOD;
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static struct {
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volatile int running;
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struct completion completion;
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pid_t poll_task;
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struct semaphore lock;
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struct of_device *of_dev;
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struct i2c_client *thermostat;
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struct i2c_client *fan;
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int overheat_temp; /* 100% fan at this temp */
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int overheat_hyst;
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int temp;
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int casetemp;
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int fan_level; /* active fan_table setting */
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int downind;
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int upind;
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int r0, r1, r20, r23, r25; /* saved register */
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} x;
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#define T(x,y) (((x)<<8) | (y)*0x100/10 )
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static struct {
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int fan_down_setting;
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int temp;
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int fan_up_setting;
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} fan_table[] = {
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{ 11, T(0,0), 11 }, /* min fan */
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{ 11, T(55,0), 11 },
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{ 6, T(55,3), 11 },
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{ 7, T(56,0), 11 },
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{ 8, T(57,0), 8 },
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{ 7, T(58,3), 7 },
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{ 6, T(58,8), 6 },
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{ 5, T(59,2), 5 },
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{ 4, T(59,6), 4 },
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{ 3, T(59,9), 3 },
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{ 2, T(60,1), 2 },
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{ 1, 0xfffff, 1 } /* on fire */
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};
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static void
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print_temp( const char *s, int temp )
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{
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printk("%s%d.%d C", s ? s : "", temp>>8, (temp & 255)*10/256 );
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}
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static ssize_t
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show_cpu_temperature( struct device *dev, char *buf )
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{
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return sprintf(buf, "%d.%d\n", x.temp>>8, (x.temp & 255)*10/256 );
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}
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static ssize_t
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show_case_temperature( struct device *dev, char *buf )
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{
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return sprintf(buf, "%d.%d\n", x.casetemp>>8, (x.casetemp & 255)*10/256 );
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}
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static DEVICE_ATTR(cpu_temperature, S_IRUGO, show_cpu_temperature, NULL );
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static DEVICE_ATTR(case_temperature, S_IRUGO, show_case_temperature, NULL );
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/************************************************************************/
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/* controller thread */
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/************************************************************************/
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static int
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write_reg( struct i2c_client *cl, int reg, int data, int len )
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{
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u8 tmp[3];
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if( len < 1 || len > 2 || data < 0 )
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return -EINVAL;
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tmp[0] = reg;
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tmp[1] = (len == 1) ? data : (data >> 8);
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tmp[2] = data;
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len++;
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if( i2c_master_send(cl, tmp, len) != len )
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return -ENODEV;
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return 0;
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}
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static int
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read_reg( struct i2c_client *cl, int reg, int len )
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{
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u8 buf[2];
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if( len != 1 && len != 2 )
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return -EINVAL;
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buf[0] = reg;
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if( i2c_master_send(cl, buf, 1) != 1 )
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return -ENODEV;
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if( i2c_master_recv(cl, buf, len) != len )
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return -ENODEV;
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return (len == 2)? ((unsigned int)buf[0] << 8) | buf[1] : buf[0];
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}
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static void
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tune_fan( int fan_setting )
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{
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int val = (fan_setting << 3) | 7;
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/* write_reg( x.fan, 0x24, val, 1 ); */
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write_reg( x.fan, 0x25, val, 1 );
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write_reg( x.fan, 0x20, 0, 1 );
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print_temp("CPU-temp: ", x.temp );
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if( x.casetemp )
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print_temp(", Case: ", x.casetemp );
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printk(", Fan: %d (tuned %+d)\n", 11-fan_setting, x.fan_level-fan_setting );
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x.fan_level = fan_setting;
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}
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static void
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poll_temp( void )
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{
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int temp, i, level, casetemp;
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temp = read_reg( x.thermostat, 0, 2 );
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/* this actually occurs when the computer is loaded */
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if( temp < 0 )
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return;
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casetemp = read_reg(x.fan, 0x0b, 1) << 8;
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casetemp |= (read_reg(x.fan, 0x06, 1) & 0x7) << 5;
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if( LOG_TEMP && x.temp != temp ) {
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print_temp("CPU-temp: ", temp );
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print_temp(", Case: ", casetemp );
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printk(", Fan: %d\n", 11-x.fan_level );
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}
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x.temp = temp;
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x.casetemp = casetemp;
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level = -1;
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for( i=0; (temp & 0xffff) > fan_table[i].temp ; i++ )
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;
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if( i < x.downind )
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level = fan_table[i].fan_down_setting;
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x.downind = i;
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for( i=0; (temp & 0xffff) >= fan_table[i+1].temp ; i++ )
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;
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if( x.upind < i )
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level = fan_table[i].fan_up_setting;
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x.upind = i;
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if( level >= 0 )
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tune_fan( level );
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}
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static void
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setup_hardware( void )
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{
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int val;
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/* save registers (if we unload the module) */
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x.r0 = read_reg( x.fan, 0x00, 1 );
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x.r1 = read_reg( x.fan, 0x01, 1 );
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x.r20 = read_reg( x.fan, 0x20, 1 );
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x.r23 = read_reg( x.fan, 0x23, 1 );
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x.r25 = read_reg( x.fan, 0x25, 1 );
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/* improve measurement resolution (convergence time 1.5s) */
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if( (val=read_reg(x.thermostat, 1, 1)) >= 0 ) {
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val |= 0x60;
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if( write_reg( x.thermostat, 1, val, 1 ) )
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printk("Failed writing config register\n");
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}
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/* disable interrupts and TAC input */
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write_reg( x.fan, 0x01, 0x01, 1 );
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/* enable filter */
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write_reg( x.fan, 0x23, 0x91, 1 );
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/* remote temp. controls fan */
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write_reg( x.fan, 0x00, 0x95, 1 );
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/* The thermostat (which besides measureing temperature controls
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* has a THERM output which puts the fan on 100%) is usually
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* set to kick in at 80 C (chip default). We reduce this a bit
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* to be on the safe side (OSX doesn't)...
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*/
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if( x.overheat_temp == (80 << 8) ) {
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x.overheat_temp = 65 << 8;
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x.overheat_hyst = 60 << 8;
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write_reg( x.thermostat, 2, x.overheat_hyst, 2 );
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write_reg( x.thermostat, 3, x.overheat_temp, 2 );
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print_temp("Reducing overheating limit to ", x.overheat_temp );
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print_temp(" (Hyst: ", x.overheat_hyst );
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printk(")\n");
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}
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/* set an initial fan setting */
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x.downind = 0xffff;
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x.upind = -1;
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/* tune_fan( fan_up_table[x.upind].fan_setting ); */
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device_create_file( &x.of_dev->dev, &dev_attr_cpu_temperature );
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device_create_file( &x.of_dev->dev, &dev_attr_case_temperature );
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}
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static void
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restore_regs( void )
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{
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device_remove_file( &x.of_dev->dev, &dev_attr_cpu_temperature );
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device_remove_file( &x.of_dev->dev, &dev_attr_case_temperature );
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write_reg( x.fan, 0x01, x.r1, 1 );
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write_reg( x.fan, 0x20, x.r20, 1 );
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write_reg( x.fan, 0x23, x.r23, 1 );
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write_reg( x.fan, 0x25, x.r25, 1 );
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write_reg( x.fan, 0x00, x.r0, 1 );
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}
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static int
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control_loop( void *dummy )
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{
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daemonize("g4fand");
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down( &x.lock );
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setup_hardware();
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while( x.running ) {
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up( &x.lock );
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msleep_interruptible(8000);
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down( &x.lock );
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poll_temp();
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}
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restore_regs();
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up( &x.lock );
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complete_and_exit( &x.completion, 0 );
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}
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/************************************************************************/
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/* i2c probing and setup */
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/************************************************************************/
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static int
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do_attach( struct i2c_adapter *adapter )
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{
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int ret = 0;
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if( strncmp(adapter->name, "uni-n", 5) )
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return 0;
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if( !x.running ) {
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ret = i2c_probe( adapter, &addr_data, &do_probe );
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if( x.thermostat && x.fan ) {
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x.running = 1;
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init_completion( &x.completion );
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x.poll_task = kernel_thread( control_loop, NULL, SIGCHLD | CLONE_KERNEL );
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}
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}
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return ret;
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}
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static int
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do_detach( struct i2c_client *client )
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{
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int err;
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if( (err=i2c_detach_client(client)) )
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printk(KERN_ERR "failed to detach thermostat client\n");
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else {
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if( x.running ) {
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x.running = 0;
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wait_for_completion( &x.completion );
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}
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if( client == x.thermostat )
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x.thermostat = NULL;
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else if( client == x.fan )
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x.fan = NULL;
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else {
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printk(KERN_ERR "g4fan: bad client\n");
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}
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kfree( client );
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}
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return err;
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}
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static struct i2c_driver g4fan_driver = {
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.owner = THIS_MODULE,
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.name = "therm_windtunnel",
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.id = I2C_DRIVERID_G4FAN,
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.flags = I2C_DF_NOTIFY,
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.attach_adapter = do_attach,
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.detach_client = do_detach,
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};
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static int
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attach_fan( struct i2c_client *cl )
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{
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if( x.fan )
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goto out;
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/* check that this is an ADM1030 */
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if( read_reg(cl, 0x3d, 1) != 0x30 || read_reg(cl, 0x3e, 1) != 0x41 )
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goto out;
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printk("ADM1030 fan controller [@%02x]\n", cl->addr );
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strlcpy( cl->name, "ADM1030 fan controller", sizeof(cl->name) );
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if( !i2c_attach_client(cl) )
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x.fan = cl;
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out:
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if( cl != x.fan )
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kfree( cl );
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return 0;
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}
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static int
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attach_thermostat( struct i2c_client *cl )
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{
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int hyst_temp, os_temp, temp;
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if( x.thermostat )
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goto out;
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if( (temp=read_reg(cl, 0, 2)) < 0 )
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goto out;
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/* temperature sanity check */
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if( temp < 0x1600 || temp > 0x3c00 )
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goto out;
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hyst_temp = read_reg(cl, 2, 2);
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os_temp = read_reg(cl, 3, 2);
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if( hyst_temp < 0 || os_temp < 0 )
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goto out;
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printk("DS1775 digital thermometer [@%02x]\n", cl->addr );
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print_temp("Temp: ", temp );
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print_temp(" Hyst: ", hyst_temp );
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print_temp(" OS: ", os_temp );
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printk("\n");
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x.temp = temp;
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x.overheat_temp = os_temp;
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x.overheat_hyst = hyst_temp;
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strlcpy( cl->name, "DS1775 thermostat", sizeof(cl->name) );
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if( !i2c_attach_client(cl) )
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x.thermostat = cl;
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out:
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if( cl != x.thermostat )
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kfree( cl );
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return 0;
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}
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static int
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do_probe( struct i2c_adapter *adapter, int addr, int kind )
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{
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struct i2c_client *cl;
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if( !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA
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| I2C_FUNC_SMBUS_WRITE_BYTE) )
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return 0;
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if( !(cl=kmalloc(sizeof(*cl), GFP_KERNEL)) )
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return -ENOMEM;
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memset( cl, 0, sizeof(struct i2c_client) );
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cl->addr = addr;
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cl->adapter = adapter;
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cl->driver = &g4fan_driver;
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cl->flags = 0;
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if( addr < 0x48 )
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return attach_fan( cl );
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return attach_thermostat( cl );
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}
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/************************************************************************/
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/* initialization / cleanup */
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/************************************************************************/
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static int
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therm_of_probe( struct of_device *dev, const struct of_match *match )
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{
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return i2c_add_driver( &g4fan_driver );
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}
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static int
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therm_of_remove( struct of_device *dev )
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{
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return i2c_del_driver( &g4fan_driver );
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}
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static struct of_match therm_of_match[] = {{
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.name = "fan",
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.type = OF_ANY_MATCH,
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.compatible = "adm1030"
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}, {}
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};
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static struct of_platform_driver therm_of_driver = {
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.name = "temperature",
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.match_table = therm_of_match,
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.probe = therm_of_probe,
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.remove = therm_of_remove,
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};
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struct apple_thermal_info {
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u8 id; /* implementation ID */
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u8 fan_count; /* number of fans */
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u8 thermostat_count; /* number of thermostats */
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u8 unused;
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};
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static int __init
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g4fan_init( void )
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{
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struct apple_thermal_info *info;
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struct device_node *np;
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init_MUTEX( &x.lock );
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if( !(np=of_find_node_by_name(NULL, "power-mgt")) )
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return -ENODEV;
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info = (struct apple_thermal_info*)get_property(np, "thermal-info", NULL);
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of_node_put(np);
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if( !info || !machine_is_compatible("PowerMac3,6") )
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return -ENODEV;
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if( info->id != 3 ) {
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printk(KERN_ERR "therm_windtunnel: unsupported thermal design %d\n", info->id );
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return -ENODEV;
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}
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if( !(np=of_find_node_by_name(NULL, "fan")) )
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return -ENODEV;
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x.of_dev = of_platform_device_create( np, "temperature" );
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of_node_put( np );
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if( !x.of_dev ) {
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printk(KERN_ERR "Can't register fan controller!\n");
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return -ENODEV;
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}
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of_register_driver( &therm_of_driver );
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return 0;
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}
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static void __exit
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g4fan_exit( void )
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{
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of_unregister_driver( &therm_of_driver );
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if( x.of_dev )
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of_device_unregister( x.of_dev );
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}
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module_init(g4fan_init);
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module_exit(g4fan_exit);
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MODULE_AUTHOR("Samuel Rydh <samuel@ibrium.se>");
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MODULE_DESCRIPTION("Apple G4 (windtunnel) fan controller");
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MODULE_LICENSE("GPL");
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