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560 lines
13 KiB
560 lines
13 KiB
/* |
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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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* temperature around 57 C. |
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* |
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* Copyright (C) 2003, 2004 Samuel Rydh ([email protected]) |
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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/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/init.h> |
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#include <linux/kthread.h> |
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#include <linux/of_platform.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/sections.h> |
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#include <asm/macio.h> |
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#define LOG_TEMP 0 /* continuously log temperature */ |
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static struct { |
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volatile int running; |
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struct task_struct *poll_task; |
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struct mutex lock; |
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struct platform_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, struct device_attribute *attr, 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, struct device_attribute *attr, 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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int err; |
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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 = 75 << 8; |
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x.overheat_hyst = 70 << 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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err = device_create_file( &x.of_dev->dev, &dev_attr_cpu_temperature ); |
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err |= device_create_file( &x.of_dev->dev, &dev_attr_case_temperature ); |
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if (err) |
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printk(KERN_WARNING |
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"Failed to create temperature attribute file(s).\n"); |
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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 control_loop(void *dummy) |
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{ |
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mutex_lock(&x.lock); |
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setup_hardware(); |
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mutex_unlock(&x.lock); |
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for (;;) { |
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msleep_interruptible(8000); |
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if (kthread_should_stop()) |
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break; |
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mutex_lock(&x.lock); |
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poll_temp(); |
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mutex_unlock(&x.lock); |
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} |
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mutex_lock(&x.lock); |
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restore_regs(); |
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mutex_unlock(&x.lock); |
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return 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 void do_attach(struct i2c_adapter *adapter) |
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{ |
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struct i2c_board_info info = { }; |
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struct device_node *np; |
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/* scan 0x48-0x4f (DS1775) and 0x2c-2x2f (ADM1030) */ |
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static const unsigned short scan_ds1775[] = { |
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0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, |
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I2C_CLIENT_END |
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}; |
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static const unsigned short scan_adm1030[] = { |
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0x2c, 0x2d, 0x2e, 0x2f, |
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I2C_CLIENT_END |
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}; |
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if (x.running || strncmp(adapter->name, "uni-n", 5)) |
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return; |
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np = of_find_compatible_node(adapter->dev.of_node, NULL, "MAC,ds1775"); |
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if (np) { |
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of_node_put(np); |
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} else { |
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strlcpy(info.type, "MAC,ds1775", I2C_NAME_SIZE); |
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i2c_new_scanned_device(adapter, &info, scan_ds1775, NULL); |
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} |
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np = of_find_compatible_node(adapter->dev.of_node, NULL, "MAC,adm1030"); |
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if (np) { |
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of_node_put(np); |
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} else { |
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strlcpy(info.type, "MAC,adm1030", I2C_NAME_SIZE); |
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i2c_new_scanned_device(adapter, &info, scan_adm1030, NULL); |
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} |
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} |
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static int |
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do_remove(struct i2c_client *client) |
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{ |
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if (x.running) { |
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x.running = 0; |
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kthread_stop(x.poll_task); |
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x.poll_task = NULL; |
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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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return 0; |
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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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x.fan = cl; |
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out: |
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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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x.thermostat = cl; |
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out: |
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return 0; |
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} |
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enum chip { ds1775, adm1030 }; |
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static const struct i2c_device_id therm_windtunnel_id[] = { |
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{ "MAC,ds1775", ds1775 }, |
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{ "MAC,adm1030", adm1030 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, therm_windtunnel_id); |
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static int |
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do_probe(struct i2c_client *cl, const struct i2c_device_id *id) |
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{ |
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struct i2c_adapter *adapter = cl->adapter; |
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int ret = 0; |
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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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switch (id->driver_data) { |
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case adm1030: |
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ret = attach_fan(cl); |
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break; |
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case ds1775: |
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ret = attach_thermostat(cl); |
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break; |
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} |
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if (!x.running && x.thermostat && x.fan) { |
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x.running = 1; |
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x.poll_task = kthread_run(control_loop, NULL, "g4fand"); |
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} |
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return ret; |
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} |
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static struct i2c_driver g4fan_driver = { |
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.driver = { |
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.name = "therm_windtunnel", |
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}, |
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.probe = do_probe, |
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.remove = do_remove, |
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.id_table = therm_windtunnel_id, |
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}; |
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/************************************************************************/ |
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/* initialization / cleanup */ |
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/************************************************************************/ |
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static int therm_of_probe(struct platform_device *dev) |
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{ |
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struct i2c_adapter *adap; |
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int ret, i = 0; |
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adap = i2c_get_adapter(0); |
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if (!adap) |
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return -EPROBE_DEFER; |
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ret = i2c_add_driver(&g4fan_driver); |
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if (ret) { |
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i2c_put_adapter(adap); |
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return ret; |
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} |
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/* We assume Macs have consecutive I2C bus numbers starting at 0 */ |
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while (adap) { |
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do_attach(adap); |
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if (x.running) |
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return 0; |
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i2c_put_adapter(adap); |
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adap = i2c_get_adapter(++i); |
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} |
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return -ENODEV; |
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} |
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static int |
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therm_of_remove( struct platform_device *dev ) |
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{ |
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i2c_del_driver( &g4fan_driver ); |
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return 0; |
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} |
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static const struct of_device_id therm_of_match[] = {{ |
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.name = "fan", |
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.compatible = "adm1030" |
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}, {} |
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}; |
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MODULE_DEVICE_TABLE(of, therm_of_match); |
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static struct platform_driver therm_of_driver = { |
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.driver = { |
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.name = "temperature", |
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.of_match_table = therm_of_match, |
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}, |
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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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const struct apple_thermal_info *info; |
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struct device_node *np; |
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mutex_init(&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 = of_get_property(np, "thermal-info", NULL); |
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of_node_put(np); |
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if( !info || !of_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", NULL); |
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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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platform_driver_register( &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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platform_driver_unregister( &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 <[email protected]>"); |
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MODULE_DESCRIPTION("Apple G4 (windtunnel) fan controller"); |
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MODULE_LICENSE("GPL");
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