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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Javier Martinez Canillas](/assets/img/avatar_default.png)
The I2C core always reports the MODALIAS uevent as "i2c:<client name" regardless if the driver was matched using the I2C id_table or the of_match_table. So technically there's no need for a driver to export the OF table since currently it's not used. In fact, the I2C device ID table is mandatory for I2C drivers since a i2c_device_id is passed to the driver's probe function even if the I2C core used the OF table to match the driver. And since the I2C core uses different tables, OF-only drivers needs to have duplicated data that has to be kept in sync and also the dev node compatible manufacturer prefix is stripped when reporting the MODALIAS. To avoid the above, the I2C core behavior may be changed in the future to not require an I2C device table for OF-only drivers and report the OF module alias. So, it's better to also export the OF table to prevent breaking module autoloading if that happens. Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
529 lines
12 KiB
C
529 lines
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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* temperature 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/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 int
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do_attach( struct i2c_adapter *adapter )
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{
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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( strncmp(adapter->name, "uni-n", 5) )
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return 0;
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if( !x.running ) {
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struct i2c_board_info info;
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memset(&info, 0, sizeof(struct i2c_board_info));
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strlcpy(info.type, "therm_ds1775", I2C_NAME_SIZE);
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i2c_new_probed_device(adapter, &info, scan_ds1775, NULL);
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strlcpy(info.type, "therm_adm1030", I2C_NAME_SIZE);
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i2c_new_probed_device(adapter, &info, scan_adm1030, NULL);
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if( 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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}
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return 0;
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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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{ "therm_ds1775", ds1775 },
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{ "therm_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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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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return attach_fan( cl );
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case ds1775:
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return attach_thermostat(cl);
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}
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return 0;
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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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.attach_adapter = do_attach,
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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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return i2c_add_driver( &g4fan_driver );
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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);
|
|
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");
|