/*
* Device driver for the i2c thermostat found on the iBook G4, Albook G4
*
* Copyright (C) 2003, 2004 Colin Leroy, Rasmus Rohde, Benjamin Herrenschmidt
*
* Documentation from
* http://www.analog.com/UploadedFiles/Data_Sheets/115254175ADT7467_pra.pdf
* http://www.analog.com/UploadedFiles/Data_Sheets/3686221171167ADT7460_b.pdf
*
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/wait.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/sections.h>
#include <asm/of_device.h>
#undef DEBUG
#define CONFIG_REG 0x40
#define MANUAL_MASK 0xe0
#define AUTO_MASK 0x20
static u8 TEMP_REG[3] = {0x26, 0x25, 0x27}; /* local, cpu, gpu */
static u8 LIMIT_REG[3] = {0x6b, 0x6a, 0x6c}; /* local, cpu, gpu */
static u8 MANUAL_MODE[2] = {0x5c, 0x5d};
static u8 REM_CONTROL[2] = {0x00, 0x40};
static u8 FAN_SPEED[2] = {0x28, 0x2a};
static u8 FAN_SPD_SET[2] = {0x30, 0x31};
static u8 default_limits_local[3] = {70, 50, 70}; /* local, cpu, gpu */
static u8 default_limits_chip[3] = {80, 65, 80}; /* local, cpu, gpu */
static int limit_adjust = 0;
static int fan_speed = -1;
MODULE_AUTHOR("Colin Leroy <colin@colino.net>");
MODULE_DESCRIPTION("Driver for ADT746x thermostat in iBook G4 and Powerbook G4 Alu");
MODULE_LICENSE("GPL");
MODULE_PARM(limit_adjust,"i");
MODULE_PARM_DESC(limit_adjust,"Adjust maximum temperatures (50°C cpu, 70°C gpu) by N °C.");
MODULE_PARM(fan_speed,"i");
MODULE_PARM_DESC(fan_speed,"Specify fan speed (0-255) when lim < temp < lim+8 (default 128)");
struct thermostat {
struct i2c_client clt;
u8 cached_temp[3];
u8 initial_limits[3];
u8 limits[3];
int last_speed[2];
int overriding[2];
};
static enum {ADT7460, ADT7467} therm_type;
static int therm_bus, therm_address;
static struct of_device * of_dev;
static struct thermostat* thermostat;
static pid_t monitor_thread_id;
static int monitor_running;
static struct completion monitor_task_compl;
static int attach_one_thermostat(struct i2c_adapter *adapter, int addr, int busno);
static void write_both_fan_speed(struct thermostat *th, int speed);
static void write_fan_speed(struct thermostat *th, int speed, int fan);
static int
write_reg(struct thermostat* th, int reg, u8 data)
{
u8 tmp[2];
int rc;
tmp[0] = reg;
tmp[1] = data;
rc = i2c_master_send(&th->clt, (const char *)tmp, 2);
if (rc < 0)
return rc;
if (rc != 2)
return -ENODEV;
return 0;
}
static int
read_reg(struct thermostat* th, int reg)
{
u8 reg_addr, data;
int rc;
reg_addr = (u8)reg;
rc = i2c_master_send(&th->clt, ®_addr, 1);
if (rc < 0)
return rc;
if (rc != 1)
return -ENODEV;
rc = i2c_master_recv(&th->clt, (char *)&data, 1);
if (rc < 0)
return rc;
return data;
}
static int
attach_thermostat(struct i2c_adapter *adapter)
{
unsigned long bus_no;
if (strncmp(adapter->name, "uni-n", 5))
return -ENODEV;
bus_no = simple_strtoul(adapter->name + 6, NULL, 10);
if (bus_no != therm_bus)
return -ENODEV;
return attach_one_thermostat(adapter, therm_address, bus_no);
}
static int
detach_thermostat(struct i2c_adapter *adapter)
{
struct thermostat* th;
int i;
if (thermostat == NULL)
return 0;
th = thermostat;
if (monitor_running) {
monitor_running = 0;
wait_for_completion(&monitor_task_compl);
}
printk(KERN_INFO "adt746x: Putting max temperatures back from %d, %d, %d,"
" to %d, %d, %d, (°C)\n",
th->limits[0], th->limits[1], th->limits[2],
th->initial_limits[0], th->initial_limits[1], th->initial_limits[2]);
for (i = 0; i < 3; i++)
write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
write_both_fan_speed(th, -1);
i2c_detach_client(&th->clt);
thermostat = NULL;
kfree(th);
return 0;
}
static struct i2c_driver thermostat_driver = {
.name ="Apple Thermostat ADT746x",
.id =0xDEAD7467,
.flags =I2C_DF_NOTIFY,
.attach_adapter =&attach_thermostat,
.detach_adapter =&detach_thermostat,
};
static int read_fan_speed(struct thermostat *th, u8 addr)
{
u8 tmp[2];
u16 res;
/* should start with low byte */
tmp[1] = read_reg(th, addr);
tmp[0] = read_reg(th, addr + 1);
res = tmp[1] + (tmp[0] << 8);
return (90000*60)/res;
}
static void write_both_fan_speed(struct thermostat *th, int speed)
{
write_fan_speed(th, speed, 0);
if (therm_type == ADT7460)
write_fan_speed(th, speed, 1);
}
static void write_fan_speed(struct thermostat *th, int speed, int fan)
{
u8 manual;
if (speed > 0xff)
speed = 0xff;
else if (speed < -1)
speed = 0;
if (therm_type == ADT7467 && fan == 1)
return;
if (th->last_speed[fan] != speed) {
if (speed == -1)
printk(KERN_INFO "adt746x: Setting speed to: automatic for %s fan.\n",
fan?"GPU":"CPU");
else
printk(KERN_INFO "adt746x: Setting speed to: %d for %s fan.\n",
speed, fan?"GPU":"CPU");
} else
return;
if (speed >= 0) {
manual = read_reg(th, MANUAL_MODE[fan]);
write_reg(th, MANUAL_MODE[fan], manual|MANUAL_MASK);
write_reg(th, FAN_SPD_SET[fan], speed);
} else {
/* back to automatic */
if(therm_type == ADT7460) {
manual = read_reg(th, MANUAL_MODE[fan]) & (~MANUAL_MASK);
write_reg(th, MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
} else {
manual = read_reg(th, MANUAL_MODE[fan]);
write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
}
}
th->last_speed[fan] = speed;
}
static int monitor_task(void *arg)
{
struct thermostat* th = arg;
u8 temps[3];
u8 lims[3];
int i;
#ifdef DEBUG
int mfan_speed;
#endif
lock_kernel();
daemonize("kfand");
unlock_kernel();
strcpy(current->comm, "thermostat");
monitor_running = 1;
while(monitor_running)
{
msleep(2000);
/* Check status */
/* local : chip */
/* remote 1: CPU ?*/
/* remote 2: GPU ?*/
#ifndef DEBUG
if (fan_speed != -1) {
#endif
for (i = 0; i < 3; i++) {
temps[i] = read_reg(th, TEMP_REG[i]);
lims[i] = th->limits[i];
}
#ifndef DEBUG
}
#endif
if (fan_speed != -1) {
int lastvar = 0; /* for iBook */
for (i = 1; i < 3; i++) { /* we don't care about local sensor */
int started = 0;
int fan_number = (therm_type == ADT7460 && i == 2);
int var = temps[i] - lims[i];
if (var > 8) {
if (th->overriding[fan_number] == 0)
printk(KERN_INFO "adt746x: Limit exceeded by %d°C, overriding specified fan speed for %s.\n",
var, fan_number?"GPU":"CPU");
th->overriding[fan_number] = 1;
write_fan_speed(th, 255, fan_number);
started = 1;
} else if ((!th->overriding[fan_number] || var < 6) && var > 0) {
if (th->overriding[fan_number] == 1)
printk(KERN_INFO "adt746x: Limit exceeded by %d°C, setting speed to specified for %s.\n",
var, fan_number?"GPU":"CPU");
th->overriding[fan_number] = 0;
write_fan_speed(th, fan_speed, fan_number);
started = 1;
} else if (var < -1) {
/* don't stop iBook fan if GPU is cold and CPU is not
* so cold (lastvar >= -1) */
if (therm_type == ADT7460 || lastvar < -1 || i == 1) {
if (th->last_speed[fan_number] != 0)
printk(KERN_INFO "adt746x: Stopping %s fan.\n",
fan_number?"GPU":"CPU");
write_fan_speed(th, 0, fan_number);
}
}
lastvar = var;
if (started && therm_type == ADT7467)
break; /* we don't want to re-stop the fan
* if CPU is heating and GPU is not */
}
}
#ifdef DEBUG
mfan_speed = read_fan_speed(th, FAN_SPEED[0]);
/* only one fan in the iBook G4 */
if (temps[0] != th->cached_temp[0]
|| temps[1] != th->cached_temp[1]
|| temps[2] != th->cached_temp[2]) {
printk(KERN_INFO "adt746x: Temperature infos:"
" thermostats: %d,%d,%d °C;"
" limits: %d,%d,%d °C;"
" fan speed: %d RPM\n",
temps[0], temps[1], temps[2],
lims[0], lims[1], lims[2],
mfan_speed);
}
th->cached_temp[0] = temps[0];
th->cached_temp[1] = temps[1];
th->cached_temp[2] = temps[2];
#endif
}
complete_and_exit(&monitor_task_compl, 0);
return 0;
}
static void
set_limit(struct thermostat *th, int i)
{
/* Set CPU limit higher to avoid powerdowns */
th->limits[i] = default_limits_chip[i] + limit_adjust;
write_reg(th, LIMIT_REG[i], th->limits[i]);
/* set our limits to normal */
th->limits[i] = default_limits_local[i] + limit_adjust;
}
static int
attach_one_thermostat(struct i2c_adapter *adapter, int addr, int busno)
{
struct thermostat* th;
int rc;
int i;
if (thermostat)
return 0;
th = (struct thermostat *)kmalloc(sizeof(struct thermostat), GFP_KERNEL);
if (!th)
return -ENOMEM;
memset(th, 0, sizeof(*th));
th->clt.addr = addr;
th->clt.adapter = adapter;
th->clt.driver = &thermostat_driver;
th->clt.id = 0xDEAD7467;
strcpy(th->clt.name, "thermostat");
rc = read_reg(th, 0);
if (rc < 0) {
printk(KERN_ERR "adt746x: Thermostat failed to read config from bus %d !\n",
busno);
kfree(th);
return -ENODEV;
}
/* force manual control to start the fan quieter */
if (fan_speed == -1)
fan_speed=128;
if(therm_type == ADT7460) {
printk(KERN_INFO "adt746x: ADT7460 initializing\n");
/* The 7460 needs to be started explicitly */
write_reg(th, CONFIG_REG, 1);
} else
printk(KERN_INFO "adt746x: ADT7467 initializing\n");
for (i = 0; i < 3; i++) {
th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
set_limit(th, i);
}
printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
" to %d, %d, %d (°C)\n",
th->initial_limits[0], th->initial_limits[1], th->initial_limits[2],
th->limits[0], th->limits[1], th->limits[2]);
thermostat = th;
if (i2c_attach_client(&th->clt)) {
printk("adt746x: Thermostat failed to attach client !\n");
thermostat = NULL;
kfree(th);
return -ENODEV;
}
/* be sure to really write fan speed the first time */
th->last_speed[0] = -2;
th->last_speed[1] = -2;
if (fan_speed != -1) {
write_both_fan_speed(th, 0);
} else {
write_both_fan_speed(th, -1);
}
init_completion(&monitor_task_compl);
monitor_thread_id = kernel_thread(monitor_task, th,
SIGCHLD | CLONE_KERNEL);
return 0;
}
/*
* Now, unfortunately, sysfs doesn't give us a nice void * we could
* pass around to the attribute functions, so we don't really have
* choice but implement a bunch of them...
*
*/
#define BUILD_SHOW_FUNC_DEG(name, data) \
static ssize_t show_##name(struct device *dev, char *buf) \
{ \
return sprintf(buf, "%d°C\n", data); \
}
#define BUILD_SHOW_FUNC_INT(name, data) \
static ssize_t show_##name(struct device *dev, char *buf) \
{ \
return sprintf(buf, "%d\n", data); \
}
#define BUILD_STORE_FUNC_DEG(name, data) \
static ssize_t store_##name(struct device *dev, const char *buf, size_t n) \
{ \
int val; \
int i; \
val = simple_strtol(buf, NULL, 10); \
printk(KERN_INFO "Adjusting limits by %d°C\n", val); \
limit_adjust = val; \
for (i=0; i < 3; i++) \
set_limit(thermostat, i); \
return n; \
}
#define BUILD_STORE_FUNC_INT(name, data) \
static ssize_t store_##name(struct device *dev, const char *buf, size_t n) \
{ \
u32 val; \
val = simple_strtoul(buf, NULL, 10); \
if (val < 0 || val > 255) \
return -EINVAL; \
printk(KERN_INFO "Setting fan speed to %d\n", val); \
data = val; \
return n; \
}
BUILD_SHOW_FUNC_DEG(cpu_temperature, (read_reg(thermostat, TEMP_REG[1])))
BUILD_SHOW_FUNC_DEG(gpu_temperature, (read_reg(thermostat, TEMP_REG[2])))
BUILD_SHOW_FUNC_DEG(cpu_limit, thermostat->limits[1])
BUILD_SHOW_FUNC_DEG(gpu_limit, thermostat->limits[2])
BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
BUILD_SHOW_FUNC_INT(cpu_fan_speed, (read_fan_speed(thermostat, FAN_SPEED[0])))
BUILD_SHOW_FUNC_INT(gpu_fan_speed, (read_fan_speed(thermostat, FAN_SPEED[1])))
BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
BUILD_SHOW_FUNC_INT(limit_adjust, limit_adjust)
BUILD_STORE_FUNC_DEG(limit_adjust, thermostat)
static DEVICE_ATTR(cpu_temperature, S_IRUGO,
show_cpu_temperature,NULL);
static DEVICE_ATTR(gpu_temperature, S_IRUGO,
show_gpu_temperature,NULL);
static DEVICE_ATTR(cpu_limit, S_IRUGO,
show_cpu_limit, NULL);
static DEVICE_ATTR(gpu_limit, S_IRUGO,
show_gpu_limit, NULL);
static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
show_specified_fan_speed,store_specified_fan_speed);
static DEVICE_ATTR(cpu_fan_speed, S_IRUGO,
show_cpu_fan_speed, NULL);
static DEVICE_ATTR(gpu_fan_speed, S_IRUGO,
show_gpu_fan_speed, NULL);
static DEVICE_ATTR(limit_adjust, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
show_limit_adjust, store_limit_adjust);
static int __init
thermostat_init(void)
{
struct device_node* np;
u32 *prop;
np = of_find_node_by_name(NULL, "fan");
if (!np)
return -ENODEV;
if (device_is_compatible(np, "adt7460"))
therm_type = ADT7460;
else if (device_is_compatible(np, "adt7467"))
therm_type = ADT7467;
else
return -ENODEV;
prop = (u32 *)get_property(np, "reg", NULL);
if (!prop)
return -ENODEV;
therm_bus = ((*prop) >> 8) & 0x0f;
therm_address = ((*prop) & 0xff) >> 1;
printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, limit_adjust: %d, fan_speed: %d\n",
therm_bus, therm_address, limit_adjust, fan_speed);
of_dev = of_platform_device_create(np, "temperatures");
if (of_dev == NULL) {
printk(KERN_ERR "Can't register temperatures device !\n");
return -ENODEV;
}
device_create_file(&of_dev->dev, &dev_attr_cpu_temperature);
device_create_file(&of_dev->dev, &dev_attr_gpu_temperature);
device_create_file(&of_dev->dev, &dev_attr_cpu_limit);
device_create_file(&of_dev->dev, &dev_attr_gpu_limit);
device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
device_create_file(&of_dev->dev, &dev_attr_cpu_fan_speed);
if(therm_type == ADT7460)
device_create_file(&of_dev->dev, &dev_attr_gpu_fan_speed);
#ifndef CONFIG_I2C_KEYWEST
request_module("i2c-keywest");
#endif
return i2c_add_driver(&thermostat_driver);
}
static void __exit
thermostat_exit(void)
{
if (of_dev) {
device_remove_file(&of_dev->dev, &dev_attr_cpu_temperature);
device_remove_file(&of_dev->dev, &dev_attr_gpu_temperature);
device_remove_file(&of_dev->dev, &dev_attr_cpu_limit);
device_remove_file(&of_dev->dev, &dev_attr_gpu_limit);
device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
device_remove_file(&of_dev->dev, &dev_attr_cpu_fan_speed);
if(therm_type == ADT7460)
device_remove_file(&of_dev->dev, &dev_attr_gpu_fan_speed);
of_device_unregister(of_dev);
}
i2c_del_driver(&thermostat_driver);
}
module_init(thermostat_init);
module_exit(thermostat_exit);
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