1 files changed, 612 insertions, 0 deletions

diff --git a/drivers/macintosh/therm_adt746x.c b/drivers/macintosh/therm_adt746x.c
new file mode 100644
index 000000000000..e0ac63effa55
--- /dev/null
+++ b/drivers/macintosh/therm_adt746x.c
@@ -0,0 +1,612 @@
+/*
+ * 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 <linux/suspend.h>
+#include <linux/kthread.h>
+#include <linux/moduleparam.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_param(limit_adjust, int, 0644);
+MODULE_PARM_DESC(limit_adjust,"Adjust maximum temperatures (50 cpu, 70 gpu) "
+                 "by N degrees.");
+
+module_param(fan_speed, int, 0644);
+MODULE_PARM_DESC(fan_speed,"Specify starting fan speed (0-255) "
+                 "(default 64)");
+
+struct thermostat {
+        struct i2c_client       clt;
+        u8                      temps[3];
+        u8                      cached_temp[3];
+        u8                      initial_limits[3];
+        u8                      limits[3];
+        int                     last_speed[2];
+        int                     last_var[2];
+};
+
+static enum {ADT7460, ADT7467} therm_type;
+static int therm_bus, therm_address;
+static struct of_device * of_dev;
+static struct thermostat* thermostat;
+static struct task_struct *thread_therm = NULL;
+
+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, &reg_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 (thread_therm != NULL) {
+                kthread_stop(thread_therm);
+        }
+                
+        printk(KERN_INFO "adt746x: Putting max temperatures back from "
+                         "%d, %d, %d to %d, %d, %d\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 = {  
+        .owner          = THIS_MODULE,
+        .name           = "therm_adt746x",
+        .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);
+        /* "a value of 0xffff means that the fan has stopped" */
+        return (res == 0xffff ? 0 : (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_DEBUG "adt746x: Setting speed to automatic "
+                                "for %s fan.\n", fan?"GPU":"CPU");
+                else
+                        printk(KERN_DEBUG "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 void read_sensors(struct thermostat *th)
+{
+        int i = 0;
+
+        for (i = 0; i < 3; i++)
+                th->temps[i]  = read_reg(th, TEMP_REG[i]);
+}
+
+#ifdef DEBUG
+static void display_stats(struct thermostat *th)
+{
+        if (th->temps[0] != th->cached_temp[0]
+        ||  th->temps[1] != th->cached_temp[1]
+        ||  th->temps[2] != th->cached_temp[2]) {
+                printk(KERN_INFO "adt746x: Temperature infos:"
+                                 " thermostats: %d,%d,%d;"
+                                 " limits: %d,%d,%d;"
+                                 " fan speed: %d RPM\n",
+                                 th->temps[0], th->temps[1], th->temps[2],
+                                 th->limits[0],  th->limits[1],  th->limits[2],
+                                 read_fan_speed(th, FAN_SPEED[0]));
+        }
+        th->cached_temp[0] = th->temps[0];
+        th->cached_temp[1] = th->temps[1];
+        th->cached_temp[2] = th->temps[2];
+}
+#endif
+
+static void update_fans_speed (struct thermostat *th)
+{
+        int lastvar = 0; /* last variation, for iBook */
+        int i = 0;
+
+        /* we don't care about local sensor, so we start at sensor 1 */
+        for (i = 1; i < 3; i++) {
+                int started = 0;
+                int fan_number = (therm_type == ADT7460 && i == 2);
+                int var = th->temps[i] - th->limits[i];
+
+                if (var > -1) {
+                        int step = (255 - fan_speed) / 7;
+                        int new_speed = 0;
+
+                        /* hysteresis : change fan speed only if variation is
+                         * more than two degrees */
+                        if (abs(var - th->last_var[fan_number]) < 2)
+                                continue;
+
+                        started = 1;
+                        new_speed = fan_speed + ((var-1)*step);
+
+                        if (new_speed < fan_speed)
+                                new_speed = fan_speed;
+                        if (new_speed > 255)
+                                new_speed = 255;
+
+                        printk(KERN_DEBUG "adt746x: setting fans speed to %d "
+                                         "(limit exceeded by %d on %s) \n",
+                                        new_speed, var,
+                                        fan_number?"GPU/pwr":"CPU");
+                        write_both_fan_speed(th, new_speed);
+                        th->last_var[fan_number] = var;
+                } else if (var < -2) {
+                        /* don't stop fan if GPU/power is cold and CPU is not
+                         * so cold (lastvar >= -1) */
+                        if (i == 2 && lastvar < -1) {
+                                if (th->last_speed[fan_number] != 0)
+                                        printk(KERN_DEBUG "adt746x: Stopping "
+                                                "fans.\n");
+                                write_both_fan_speed(th, 0);
+                        }
+                }
+
+                lastvar = var;
+
+                if (started)
+                        return; /* we don't want to re-stop the fan
+                                * if CPU is heating and GPU/power is not */
+        }
+}
+
+static int monitor_task(void *arg)
+{
+        struct thermostat* th = arg;
+
+        while(!kthread_should_stop()) {
+                if (current->flags & PF_FREEZE)
+                        refrigerator(PF_FREEZE);
+
+                msleep_interruptible(2000);
+
+#ifndef DEBUG
+                if (fan_speed != -1)
+                        read_sensors(th);
+#else
+                read_sensors(th);
+#endif          
+
+                if (fan_speed != -1)
+                        update_fans_speed(th);
+
+#ifdef DEBUG
+                display_stats(th);
+#endif
+
+        }
+
+        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;
+        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 = 64;
+        
+        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\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(KERN_INFO "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;
+        th->last_var[0] = -80;
+        th->last_var[1] = -80;
+
+        if (fan_speed != -1) {
+                /* manual mode, stop fans */
+                write_both_fan_speed(th, 0);
+        } else {
+                /* automatic mode */
+                write_both_fan_speed(th, -1);
+        }
+        
+        thread_therm = kthread_run(monitor_task, th, "kfand");
+
+        if (thread_therm == ERR_PTR(-ENOMEM)) {
+                printk(KERN_INFO "adt746x: Kthread creation failed\n");
+                thread_therm = NULL;
+                return -ENOMEM;
+        }
+
+        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_INT(name, data)                         \
+static ssize_t show_##name(struct device *dev, char *buf)       \
+{                                                               \
+        return sprintf(buf, "%d\n", data);                      \
+}
+
+#define BUILD_SHOW_FUNC_FAN(name, data)                         \
+static ssize_t show_##name(struct device *dev, char *buf)       \
+{                                                               \
+        return sprintf(buf, "%d (%d rpm)\n",                    \
+                thermostat->last_speed[data],                   \
+                read_fan_speed(thermostat, FAN_SPEED[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 specified fan speed to %d\n", val);   \
+        data = val;                                             \
+        return n;                                               \
+}
+
+BUILD_SHOW_FUNC_INT(cpu_temperature,     (read_reg(thermostat, TEMP_REG[1])))
+BUILD_SHOW_FUNC_INT(gpu_temperature,     (read_reg(thermostat, TEMP_REG[2])))
+BUILD_SHOW_FUNC_INT(cpu_limit,           thermostat->limits[1])
+BUILD_SHOW_FUNC_INT(gpu_limit,           thermostat->limits[2])
+
+BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
+BUILD_SHOW_FUNC_FAN(cpu_fan_speed,       0)
+BUILD_SHOW_FUNC_FAN(gpu_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;
+
+        /* look for bus either by path or using "reg" */
+        if (strstr(np->full_name, "/i2c-bus@") != NULL) {
+                const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
+                therm_bus = tmp_bus[0]-'0';
+        } else {
+                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);