Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

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);