This driver provides thermostat and fan control for the desktop
G5 machines.
+config WINDFARM
+ tristate "New PowerMac thermal control infrastructure"
+
+config WINDFARM_PM81
+ tristate "Support for thermal management on iMac G5"
+ depends on WINDFARM && I2C && CPU_FREQ_PMAC64 && PMAC_SMU
+ select I2C_PMAC_SMU
+ help
+ This driver provides thermal control for the iMacG5
+
+config WINDFARM_PM91
+ tristate "Support for thermal management on PowerMac9,1"
+ depends on WINDFARM && I2C && CPU_FREQ_PMAC64 && PMAC_SMU
+ select I2C_PMAC_SMU
+ help
+ This driver provides thermal control for the PowerMac9,1
+ which is the recent (SMU based) single CPU desktop G5
+
+
config ANSLCD
tristate "Support for ANS LCD display"
depends on ADB_CUDA && PPC_PMAC
obj-$(CONFIG_THERM_PM72) += therm_pm72.o
obj-$(CONFIG_THERM_WINDTUNNEL) += therm_windtunnel.o
obj-$(CONFIG_THERM_ADT746X) += therm_adt746x.o
+obj-$(CONFIG_WINDFARM) += windfarm_core.o
+obj-$(CONFIG_WINDFARM_PM81) += windfarm_smu_controls.o \
+ windfarm_smu_sensors.o \
+ windfarm_lm75_sensor.o windfarm_pid.o \
+ windfarm_cpufreq_clamp.o windfarm_pm81.o
+obj-$(CONFIG_WINDFARM_PM91) += windfarm_smu_controls.o \
+ windfarm_smu_sensors.o \
+ windfarm_lm75_sensor.o windfarm_pid.o \
+ windfarm_cpufreq_clamp.o windfarm_pm91.o
sprintf(name, "smu-i2c-%02x", *reg);
of_platform_device_create(np, name, &smu->of_dev->dev);
}
+ if (device_is_compatible(np, "smu-sensors"))
+ of_platform_device_create(np, "smu-sensors", &smu->of_dev->dev);
}
}
--- /dev/null
+/*
+ * Windfarm PowerMac thermal control.
+ *
+ * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ *
+ * Released under the term of the GNU GPL v2.
+ */
+
+#ifndef __WINDFARM_H__
+#define __WINDFARM_H__
+
+#include <linux/kref.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+
+/* Display a 16.16 fixed point value */
+#define FIX32TOPRINT(f) ((f) >> 16),((((f) & 0xffff) * 1000) >> 16)
+
+/*
+ * Control objects
+ */
+
+struct wf_control;
+
+struct wf_control_ops {
+ int (*set_value)(struct wf_control *ct, s32 val);
+ int (*get_value)(struct wf_control *ct, s32 *val);
+ s32 (*get_min)(struct wf_control *ct);
+ s32 (*get_max)(struct wf_control *ct);
+ void (*release)(struct wf_control *ct);
+ struct module *owner;
+};
+
+struct wf_control {
+ struct list_head link;
+ struct wf_control_ops *ops;
+ char *name;
+ int type;
+ struct kref ref;
+};
+
+#define WF_CONTROL_TYPE_GENERIC 0
+#define WF_CONTROL_RPM_FAN 1
+#define WF_CONTROL_PWM_FAN 2
+
+
+/* Note about lifetime rules: wf_register_control() will initialize
+ * the kref and wf_unregister_control will decrement it, thus the
+ * object creating/disposing a given control shouldn't assume it
+ * still exists after wf_unregister_control has been called.
+ * wf_find_control will inc the refcount for you
+ */
+extern int wf_register_control(struct wf_control *ct);
+extern void wf_unregister_control(struct wf_control *ct);
+extern struct wf_control * wf_find_control(const char *name);
+extern int wf_get_control(struct wf_control *ct);
+extern void wf_put_control(struct wf_control *ct);
+
+static inline int wf_control_set_max(struct wf_control *ct)
+{
+ s32 vmax = ct->ops->get_max(ct);
+ return ct->ops->set_value(ct, vmax);
+}
+
+static inline int wf_control_set_min(struct wf_control *ct)
+{
+ s32 vmin = ct->ops->get_min(ct);
+ return ct->ops->set_value(ct, vmin);
+}
+
+/*
+ * Sensor objects
+ */
+
+struct wf_sensor;
+
+struct wf_sensor_ops {
+ int (*get_value)(struct wf_sensor *sr, s32 *val);
+ void (*release)(struct wf_sensor *sr);
+ struct module *owner;
+};
+
+struct wf_sensor {
+ struct list_head link;
+ struct wf_sensor_ops *ops;
+ char *name;
+ struct kref ref;
+};
+
+/* Same lifetime rules as controls */
+extern int wf_register_sensor(struct wf_sensor *sr);
+extern void wf_unregister_sensor(struct wf_sensor *sr);
+extern struct wf_sensor * wf_find_sensor(const char *name);
+extern int wf_get_sensor(struct wf_sensor *sr);
+extern void wf_put_sensor(struct wf_sensor *sr);
+
+/* For use by clients. Note that we are a bit racy here since
+ * notifier_block doesn't have a module owner field. I may fix
+ * it one day ...
+ *
+ * LOCKING NOTE !
+ *
+ * All "events" except WF_EVENT_TICK are called with an internal mutex
+ * held which will deadlock if you call basically any core routine.
+ * So don't ! Just take note of the event and do your actual operations
+ * from the ticker.
+ *
+ */
+extern int wf_register_client(struct notifier_block *nb);
+extern int wf_unregister_client(struct notifier_block *nb);
+
+/* Overtemp conditions. Those are refcounted */
+extern void wf_set_overtemp(void);
+extern void wf_clear_overtemp(void);
+extern int wf_is_overtemp(void);
+
+#define WF_EVENT_NEW_CONTROL 0 /* param is wf_control * */
+#define WF_EVENT_NEW_SENSOR 1 /* param is wf_sensor * */
+#define WF_EVENT_OVERTEMP 2 /* no param */
+#define WF_EVENT_NORMALTEMP 3 /* overtemp condition cleared */
+#define WF_EVENT_TICK 4 /* 1 second tick */
+
+/* Note: If that driver gets more broad use, we could replace the
+ * simplistic overtemp bits with "environmental conditions". That
+ * could then be used to also notify of things like fan failure,
+ * case open, battery conditions, ...
+ */
+
+#endif /* __WINDFARM_H__ */
--- /dev/null
+/*
+ * Windfarm PowerMac thermal control. Core
+ *
+ * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ *
+ * Released under the term of the GNU GPL v2.
+ *
+ * This core code tracks the list of sensors & controls, register
+ * clients, and holds the kernel thread used for control.
+ *
+ * TODO:
+ *
+ * Add some information about sensor/control type and data format to
+ * sensors/controls, and have the sysfs attribute stuff be moved
+ * generically here instead of hard coded in the platform specific
+ * driver as it us currently
+ *
+ * This however requires solving some annoying lifetime issues with
+ * sysfs which doesn't seem to have lifetime rules for struct attribute,
+ * I may have to create full features kobjects for every sensor/control
+ * instead which is a bit of an overkill imho
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/kthread.h>
+#include <linux/jiffies.h>
+#include <linux/reboot.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+
+#include "windfarm.h"
+
+#define VERSION "0.2"
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(args...) printk(args)
+#else
+#define DBG(args...) do { } while(0)
+#endif
+
+static LIST_HEAD(wf_controls);
+static LIST_HEAD(wf_sensors);
+static DECLARE_MUTEX(wf_lock);
+static struct notifier_block *wf_client_list;
+static int wf_client_count;
+static unsigned int wf_overtemp;
+static unsigned int wf_overtemp_counter;
+struct task_struct *wf_thread;
+
+/*
+ * Utilities & tick thread
+ */
+
+static inline void wf_notify(int event, void *param)
+{
+ notifier_call_chain(&wf_client_list, event, param);
+}
+
+int wf_critical_overtemp(void)
+{
+ static char * critical_overtemp_path = "/sbin/critical_overtemp";
+ char *argv[] = { critical_overtemp_path, NULL };
+ static char *envp[] = { "HOME=/",
+ "TERM=linux",
+ "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
+ NULL };
+
+ return call_usermodehelper(critical_overtemp_path, argv, envp, 0);
+}
+EXPORT_SYMBOL_GPL(wf_critical_overtemp);
+
+static int wf_thread_func(void *data)
+{
+ unsigned long next, delay;
+
+ next = jiffies;
+
+ DBG("wf: thread started\n");
+
+ while(!kthread_should_stop()) {
+ try_to_freeze();
+
+ if (time_after_eq(jiffies, next)) {
+ wf_notify(WF_EVENT_TICK, NULL);
+ if (wf_overtemp) {
+ wf_overtemp_counter++;
+ /* 10 seconds overtemp, notify userland */
+ if (wf_overtemp_counter > 10)
+ wf_critical_overtemp();
+ /* 30 seconds, shutdown */
+ if (wf_overtemp_counter > 30) {
+ printk(KERN_ERR "windfarm: Overtemp "
+ "for more than 30"
+ " seconds, shutting down\n");
+ machine_power_off();
+ }
+ }
+ next += HZ;
+ }
+
+ delay = next - jiffies;
+ if (delay <= HZ)
+ schedule_timeout_interruptible(delay);
+
+ /* there should be no signal, but oh well */
+ if (signal_pending(current)) {
+ printk(KERN_WARNING "windfarm: thread got sigl !\n");
+ break;
+ }
+ }
+
+ DBG("wf: thread stopped\n");
+
+ return 0;
+}
+
+static void wf_start_thread(void)
+{
+ wf_thread = kthread_run(wf_thread_func, NULL, "kwindfarm");
+ if (IS_ERR(wf_thread)) {
+ printk(KERN_ERR "windfarm: failed to create thread,err %ld\n",
+ PTR_ERR(wf_thread));
+ wf_thread = NULL;
+ }
+}
+
+
+static void wf_stop_thread(void)
+{
+ if (wf_thread)
+ kthread_stop(wf_thread);
+ wf_thread = NULL;
+}
+
+/*
+ * Controls
+ */
+
+static void wf_control_release(struct kref *kref)
+{
+ struct wf_control *ct = container_of(kref, struct wf_control, ref);
+
+ DBG("wf: Deleting control %s\n", ct->name);
+
+ if (ct->ops && ct->ops->release)
+ ct->ops->release(ct);
+ else
+ kfree(ct);
+}
+
+int wf_register_control(struct wf_control *new_ct)
+{
+ struct wf_control *ct;
+
+ down(&wf_lock);
+ list_for_each_entry(ct, &wf_controls, link) {
+ if (!strcmp(ct->name, new_ct->name)) {
+ printk(KERN_WARNING "windfarm: trying to register"
+ " duplicate control %s\n", ct->name);
+ up(&wf_lock);
+ return -EEXIST;
+ }
+ }
+ kref_init(&new_ct->ref);
+ list_add(&new_ct->link, &wf_controls);
+
+ DBG("wf: Registered control %s\n", new_ct->name);
+
+ wf_notify(WF_EVENT_NEW_CONTROL, new_ct);
+ up(&wf_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(wf_register_control);
+
+void wf_unregister_control(struct wf_control *ct)
+{
+ down(&wf_lock);
+ list_del(&ct->link);
+ up(&wf_lock);
+
+ DBG("wf: Unregistered control %s\n", ct->name);
+
+ kref_put(&ct->ref, wf_control_release);
+}
+EXPORT_SYMBOL_GPL(wf_unregister_control);
+
+struct wf_control * wf_find_control(const char *name)
+{
+ struct wf_control *ct;
+
+ down(&wf_lock);
+ list_for_each_entry(ct, &wf_controls, link) {
+ if (!strcmp(ct->name, name)) {
+ if (wf_get_control(ct))
+ ct = NULL;
+ up(&wf_lock);
+ return ct;
+ }
+ }
+ up(&wf_lock);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(wf_find_control);
+
+int wf_get_control(struct wf_control *ct)
+{
+ if (!try_module_get(ct->ops->owner))
+ return -ENODEV;
+ kref_get(&ct->ref);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(wf_get_control);
+
+void wf_put_control(struct wf_control *ct)
+{
+ struct module *mod = ct->ops->owner;
+ kref_put(&ct->ref, wf_control_release);
+ module_put(mod);
+}
+EXPORT_SYMBOL_GPL(wf_put_control);
+
+
+/*
+ * Sensors
+ */
+
+
+static void wf_sensor_release(struct kref *kref)
+{
+ struct wf_sensor *sr = container_of(kref, struct wf_sensor, ref);
+
+ DBG("wf: Deleting sensor %s\n", sr->name);
+
+ if (sr->ops && sr->ops->release)
+ sr->ops->release(sr);
+ else
+ kfree(sr);
+}
+
+int wf_register_sensor(struct wf_sensor *new_sr)
+{
+ struct wf_sensor *sr;
+
+ down(&wf_lock);
+ list_for_each_entry(sr, &wf_sensors, link) {
+ if (!strcmp(sr->name, new_sr->name)) {
+ printk(KERN_WARNING "windfarm: trying to register"
+ " duplicate sensor %s\n", sr->name);
+ up(&wf_lock);
+ return -EEXIST;
+ }
+ }
+ kref_init(&new_sr->ref);
+ list_add(&new_sr->link, &wf_sensors);
+
+ DBG("wf: Registered sensor %s\n", new_sr->name);
+
+ wf_notify(WF_EVENT_NEW_SENSOR, new_sr);
+ up(&wf_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(wf_register_sensor);
+
+void wf_unregister_sensor(struct wf_sensor *sr)
+{
+ down(&wf_lock);
+ list_del(&sr->link);
+ up(&wf_lock);
+
+ DBG("wf: Unregistered sensor %s\n", sr->name);
+
+ wf_put_sensor(sr);
+}
+EXPORT_SYMBOL_GPL(wf_unregister_sensor);
+
+struct wf_sensor * wf_find_sensor(const char *name)
+{
+ struct wf_sensor *sr;
+
+ down(&wf_lock);
+ list_for_each_entry(sr, &wf_sensors, link) {
+ if (!strcmp(sr->name, name)) {
+ if (wf_get_sensor(sr))
+ sr = NULL;
+ up(&wf_lock);
+ return sr;
+ }
+ }
+ up(&wf_lock);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(wf_find_sensor);
+
+int wf_get_sensor(struct wf_sensor *sr)
+{
+ if (!try_module_get(sr->ops->owner))
+ return -ENODEV;
+ kref_get(&sr->ref);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(wf_get_sensor);
+
+void wf_put_sensor(struct wf_sensor *sr)
+{
+ struct module *mod = sr->ops->owner;
+ kref_put(&sr->ref, wf_sensor_release);
+ module_put(mod);
+}
+EXPORT_SYMBOL_GPL(wf_put_sensor);
+
+
+/*
+ * Client & notification
+ */
+
+int wf_register_client(struct notifier_block *nb)
+{
+ int rc;
+ struct wf_control *ct;
+ struct wf_sensor *sr;
+
+ down(&wf_lock);
+ rc = notifier_chain_register(&wf_client_list, nb);
+ if (rc != 0)
+ goto bail;
+ wf_client_count++;
+ list_for_each_entry(ct, &wf_controls, link)
+ wf_notify(WF_EVENT_NEW_CONTROL, ct);
+ list_for_each_entry(sr, &wf_sensors, link)
+ wf_notify(WF_EVENT_NEW_SENSOR, sr);
+ if (wf_client_count == 1)
+ wf_start_thread();
+ bail:
+ up(&wf_lock);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(wf_register_client);
+
+int wf_unregister_client(struct notifier_block *nb)
+{
+ down(&wf_lock);
+ notifier_chain_unregister(&wf_client_list, nb);
+ wf_client_count++;
+ if (wf_client_count == 0)
+ wf_stop_thread();
+ up(&wf_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(wf_unregister_client);
+
+void wf_set_overtemp(void)
+{
+ down(&wf_lock);
+ wf_overtemp++;
+ if (wf_overtemp == 1) {
+ printk(KERN_WARNING "windfarm: Overtemp condition detected !\n");
+ wf_overtemp_counter = 0;
+ wf_notify(WF_EVENT_OVERTEMP, NULL);
+ }
+ up(&wf_lock);
+}
+EXPORT_SYMBOL_GPL(wf_set_overtemp);
+
+void wf_clear_overtemp(void)
+{
+ down(&wf_lock);
+ WARN_ON(wf_overtemp == 0);
+ if (wf_overtemp == 0) {
+ up(&wf_lock);
+ return;
+ }
+ wf_overtemp--;
+ if (wf_overtemp == 0) {
+ printk(KERN_WARNING "windfarm: Overtemp condition cleared !\n");
+ wf_notify(WF_EVENT_NORMALTEMP, NULL);
+ }
+ up(&wf_lock);
+}
+EXPORT_SYMBOL_GPL(wf_clear_overtemp);
+
+int wf_is_overtemp(void)
+{
+ return (wf_overtemp != 0);
+}
+EXPORT_SYMBOL_GPL(wf_is_overtemp);
+
+static struct platform_device wf_platform_device = {
+ .name = "windfarm",
+};
+
+static int __init windfarm_core_init(void)
+{
+ DBG("wf: core loaded\n");
+
+ platform_device_register(&wf_platform_device);
+ return 0;
+}
+
+static void __exit windfarm_core_exit(void)
+{
+ BUG_ON(wf_client_count != 0);
+
+ DBG("wf: core unloaded\n");
+
+ platform_device_unregister(&wf_platform_device);
+}
+
+
+module_init(windfarm_core_init);
+module_exit(windfarm_core_exit);
+
+MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
+MODULE_DESCRIPTION("Core component of PowerMac thermal control");
+MODULE_LICENSE("GPL");
+
--- /dev/null
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/wait.h>
+#include <linux/cpufreq.h>
+
+#include "windfarm.h"
+
+#define VERSION "0.3"
+
+static int clamped;
+static struct wf_control *clamp_control;
+
+static int clamp_notifier_call(struct notifier_block *self,
+ unsigned long event, void *data)
+{
+ struct cpufreq_policy *p = data;
+ unsigned long max_freq;
+
+ if (event != CPUFREQ_ADJUST)
+ return 0;
+
+ max_freq = clamped ? (p->cpuinfo.min_freq) : (p->cpuinfo.max_freq);
+ cpufreq_verify_within_limits(p, 0, max_freq);
+
+ return 0;
+}
+
+static struct notifier_block clamp_notifier = {
+ .notifier_call = clamp_notifier_call,
+};
+
+static int clamp_set(struct wf_control *ct, s32 value)
+{
+ if (value)
+ printk(KERN_INFO "windfarm: Clamping CPU frequency to "
+ "minimum !\n");
+ else
+ printk(KERN_INFO "windfarm: CPU frequency unclamped !\n");
+ clamped = value;
+ cpufreq_update_policy(0);
+ return 0;
+}
+
+static int clamp_get(struct wf_control *ct, s32 *value)
+{
+ *value = clamped;
+ return 0;
+}
+
+static s32 clamp_min(struct wf_control *ct)
+{
+ return 0;
+}
+
+static s32 clamp_max(struct wf_control *ct)
+{
+ return 1;
+}
+
+static struct wf_control_ops clamp_ops = {
+ .set_value = clamp_set,
+ .get_value = clamp_get,
+ .get_min = clamp_min,
+ .get_max = clamp_max,
+ .owner = THIS_MODULE,
+};
+
+static int __init wf_cpufreq_clamp_init(void)
+{
+ struct wf_control *clamp;
+
+ clamp = kmalloc(sizeof(struct wf_control), GFP_KERNEL);
+ if (clamp == NULL)
+ return -ENOMEM;
+ cpufreq_register_notifier(&clamp_notifier, CPUFREQ_POLICY_NOTIFIER);
+ clamp->ops = &clamp_ops;
+ clamp->name = "cpufreq-clamp";
+ if (wf_register_control(clamp))
+ goto fail;
+ clamp_control = clamp;
+ return 0;
+ fail:
+ kfree(clamp);
+ return -ENODEV;
+}
+
+static void __exit wf_cpufreq_clamp_exit(void)
+{
+ if (clamp_control)
+ wf_unregister_control(clamp_control);
+}
+
+
+module_init(wf_cpufreq_clamp_init);
+module_exit(wf_cpufreq_clamp_exit);
+
+MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
+MODULE_DESCRIPTION("CPU frequency clamp for PowerMacs thermal control");
+MODULE_LICENSE("GPL");
+
--- /dev/null
+/*
+ * Windfarm PowerMac thermal control. LM75 sensor
+ *
+ * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ *
+ * Released under the term of the GNU GPL v2.
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/wait.h>
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/sections.h>
+
+#include "windfarm.h"
+
+#define VERSION "0.1"
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(args...) printk(args)
+#else
+#define DBG(args...) do { } while(0)
+#endif
+
+struct wf_lm75_sensor {
+ int ds1775 : 1;
+ int inited : 1;
+ struct i2c_client i2c;
+ struct wf_sensor sens;
+};
+#define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens)
+#define i2c_to_lm75(c) container_of(c, struct wf_lm75_sensor, i2c)
+
+static int wf_lm75_attach(struct i2c_adapter *adapter);
+static int wf_lm75_detach(struct i2c_client *client);
+
+static struct i2c_driver wf_lm75_driver = {
+ .owner = THIS_MODULE,
+ .name = "wf_lm75",
+ .flags = I2C_DF_NOTIFY,
+ .attach_adapter = wf_lm75_attach,
+ .detach_client = wf_lm75_detach,
+};
+
+static int wf_lm75_get(struct wf_sensor *sr, s32 *value)
+{
+ struct wf_lm75_sensor *lm = wf_to_lm75(sr);
+ s32 data;
+
+ if (lm->i2c.adapter == NULL)
+ return -ENODEV;
+
+ /* Init chip if necessary */
+ if (!lm->inited) {
+ u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(&lm->i2c, 1);
+
+ DBG("wf_lm75: Initializing %s, cfg was: %02x\n",
+ sr->name, cfg);
+
+ /* clear shutdown bit, keep other settings as left by
+ * the firmware for now
+ */
+ cfg_new = cfg & ~0x01;
+ i2c_smbus_write_byte_data(&lm->i2c, 1, cfg_new);
+ lm->inited = 1;
+
+ /* If we just powered it up, let's wait 200 ms */
+ msleep(200);
+ }
+
+ /* Read temperature register */
+ data = (s32)le16_to_cpu(i2c_smbus_read_word_data(&lm->i2c, 0));
+ data <<= 8;
+ *value = data;
+
+ return 0;
+}
+
+static void wf_lm75_release(struct wf_sensor *sr)
+{
+ struct wf_lm75_sensor *lm = wf_to_lm75(sr);
+
+ /* check if client is registered and detach from i2c */
+ if (lm->i2c.adapter) {
+ i2c_detach_client(&lm->i2c);
+ lm->i2c.adapter = NULL;
+ }
+
+ kfree(lm);
+}
+
+static struct wf_sensor_ops wf_lm75_ops = {
+ .get_value = wf_lm75_get,
+ .release = wf_lm75_release,
+ .owner = THIS_MODULE,
+};
+
+static struct wf_lm75_sensor *wf_lm75_create(struct i2c_adapter *adapter,
+ u8 addr, int ds1775,
+ const char *loc)
+{
+ struct wf_lm75_sensor *lm;
+
+ DBG("wf_lm75: creating %s device at address 0x%02x\n",
+ ds1775 ? "ds1775" : "lm75", addr);
+
+ lm = kmalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL);
+ if (lm == NULL)
+ return NULL;
+ memset(lm, 0, sizeof(struct wf_lm75_sensor));
+
+ /* Usual rant about sensor names not beeing very consistent in
+ * the device-tree, oh well ...
+ * Add more entries below as you deal with more setups
+ */
+ if (!strcmp(loc, "Hard drive") || !strcmp(loc, "DRIVE BAY"))
+ lm->sens.name = "hd-temp";
+ else
+ goto fail;
+
+ lm->inited = 0;
+ lm->sens.ops = &wf_lm75_ops;
+ lm->ds1775 = ds1775;
+ lm->i2c.addr = (addr >> 1) & 0x7f;
+ lm->i2c.adapter = adapter;
+ lm->i2c.driver = &wf_lm75_driver;
+ strncpy(lm->i2c.name, lm->sens.name, I2C_NAME_SIZE-1);
+
+ if (i2c_attach_client(&lm->i2c)) {
+ printk(KERN_ERR "windfarm: failed to attach %s %s to i2c\n",
+ ds1775 ? "ds1775" : "lm75", lm->i2c.name);
+ goto fail;
+ }
+
+ if (wf_register_sensor(&lm->sens)) {
+ i2c_detach_client(&lm->i2c);
+ goto fail;
+ }
+
+ return lm;
+ fail:
+ kfree(lm);
+ return NULL;
+}
+
+static int wf_lm75_attach(struct i2c_adapter *adapter)
+{
+ u8 bus_id;
+ struct device_node *smu, *bus, *dev;
+
+ /* We currently only deal with LM75's hanging off the SMU
+ * i2c busses. If we extend that driver to other/older
+ * machines, we should split this function into SMU-i2c,
+ * keywest-i2c, PMU-i2c, ...
+ */
+
+ DBG("wf_lm75: adapter %s detected\n", adapter->name);
+
+ if (strncmp(adapter->name, "smu-i2c-", 8) != 0)
+ return 0;
+ smu = of_find_node_by_type(NULL, "smu");
+ if (smu == NULL)
+ return 0;
+
+ /* Look for the bus in the device-tree */
+ bus_id = (u8)simple_strtoul(adapter->name + 8, NULL, 16);
+
+ DBG("wf_lm75: bus ID is %x\n", bus_id);
+
+ /* Look for sensors subdir */
+ for (bus = NULL;
+ (bus = of_get_next_child(smu, bus)) != NULL;) {
+ u32 *reg;
+
+ if (strcmp(bus->name, "i2c"))
+ continue;
+ reg = (u32 *)get_property(bus, "reg", NULL);
+ if (reg == NULL)
+ continue;
+ if (bus_id == *reg)
+ break;
+ }
+ of_node_put(smu);
+ if (bus == NULL) {
+ printk(KERN_WARNING "windfarm: SMU i2c bus 0x%x not found"
+ " in device-tree !\n", bus_id);
+ return 0;
+ }
+
+ DBG("wf_lm75: bus found, looking for device...\n");
+
+ /* Now look for lm75(s) in there */
+ for (dev = NULL;
+ (dev = of_get_next_child(bus, dev)) != NULL;) {
+ const char *loc =
+ get_property(dev, "hwsensor-location", NULL);
+ u32 *reg = (u32 *)get_property(dev, "reg", NULL);
+ DBG(" dev: %s... (loc: %p, reg: %p)\n", dev->name, loc, reg);
+ if (loc == NULL || reg == NULL)
+ continue;
+ /* real lm75 */
+ if (device_is_compatible(dev, "lm75"))
+ wf_lm75_create(adapter, *reg, 0, loc);
+ /* ds1775 (compatible, better resolution */
+ else if (device_is_compatible(dev, "ds1775"))
+ wf_lm75_create(adapter, *reg, 1, loc);
+ }
+
+ of_node_put(bus);
+
+ return 0;
+}
+
+static int wf_lm75_detach(struct i2c_client *client)
+{
+ struct wf_lm75_sensor *lm = i2c_to_lm75(client);
+
+ DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name);
+
+ /* Mark client detached */
+ lm->i2c.adapter = NULL;
+
+ /* release sensor */
+ wf_unregister_sensor(&lm->sens);
+
+ return 0;
+}
+
+static int __init wf_lm75_sensor_init(void)
+{
+ int rc;
+
+ rc = i2c_add_driver(&wf_lm75_driver);
+ if (rc < 0)
+ return rc;
+ return 0;
+}
+
+static void __exit wf_lm75_sensor_exit(void)
+{
+ i2c_del_driver(&wf_lm75_driver);
+}
+
+
+module_init(wf_lm75_sensor_init);
+module_exit(wf_lm75_sensor_exit);
+
+MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
+MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control");
+MODULE_LICENSE("GPL");
+
--- /dev/null
+/*
+ * Windfarm PowerMac thermal control. Generic PID helpers
+ *
+ * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ *
+ * Released under the term of the GNU GPL v2.
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/module.h>
+
+#include "windfarm_pid.h"
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(args...) printk(args)
+#else
+#define DBG(args...) do { } while(0)
+#endif
+
+void wf_pid_init(struct wf_pid_state *st, struct wf_pid_param *param)
+{
+ memset(st, 0, sizeof(struct wf_pid_state));
+ st->param = *param;
+ st->first = 1;
+}
+EXPORT_SYMBOL_GPL(wf_pid_init);
+
+s32 wf_pid_run(struct wf_pid_state *st, s32 new_sample)
+{
+ s64 error, integ, deriv;
+ s32 target;
+ int i, hlen = st->param.history_len;
+
+ /* Calculate error term */
+ error = new_sample - st->param.itarget;
+
+ /* Get samples into our history buffer */
+ if (st->first) {
+ for (i = 0; i < hlen; i++) {
+ st->samples[i] = new_sample;
+ st->errors[i] = error;
+ }
+ st->first = 0;
+ st->index = 0;
+ } else {
+ st->index = (st->index + 1) % hlen;
+ st->samples[st->index] = new_sample;
+ st->errors[st->index] = error;
+ }
+
+ /* Calculate integral term */
+ for (i = 0, integ = 0; i < hlen; i++)
+ integ += st->errors[(st->index + hlen - i) % hlen];
+ integ *= st->param.interval;
+
+ /* Calculate derivative term */
+ deriv = st->errors[st->index] -
+ st->errors[(st->index + hlen - 1) % hlen];
+ deriv /= st->param.interval;
+
+ /* Calculate target */
+ target = (s32)((integ * (s64)st->param.gr + deriv * (s64)st->param.gd +
+ error * (s64)st->param.gp) >> 36);
+ if (st->param.additive)
+ target += st->target;
+ target = max(target, st->param.min);
+ target = min(target, st->param.max);
+ st->target = target;
+
+ return st->target;
+}
+EXPORT_SYMBOL_GPL(wf_pid_run);
+
+void wf_cpu_pid_init(struct wf_cpu_pid_state *st,
+ struct wf_cpu_pid_param *param)
+{
+ memset(st, 0, sizeof(struct wf_cpu_pid_state));
+ st->param = *param;
+ st->first = 1;
+}
+EXPORT_SYMBOL_GPL(wf_cpu_pid_init);
+
+s32 wf_cpu_pid_run(struct wf_cpu_pid_state *st, s32 new_power, s32 new_temp)
+{
+ s64 error, integ, deriv, prop;
+ s32 target, sval, adj;
+ int i, hlen = st->param.history_len;
+
+ /* Calculate error term */
+ error = st->param.pmaxadj - new_power;
+
+ /* Get samples into our history buffer */
+ if (st->first) {
+ for (i = 0; i < hlen; i++) {
+ st->powers[i] = new_power;
+ st->errors[i] = error;
+ }
+ st->temps[0] = st->temps[1] = new_temp;
+ st->first = 0;
+ st->index = st->tindex = 0;
+ } else {
+ st->index = (st->index + 1) % hlen;
+ st->powers[st->index] = new_power;
+ st->errors[st->index] = error;
+ st->tindex = (st->tindex + 1) % 2;
+ st->temps[st->tindex] = new_temp;
+ }
+
+ /* Calculate integral term */
+ for (i = 0, integ = 0; i < hlen; i++)
+ integ += st->errors[(st->index + hlen - i) % hlen];
+ integ *= st->param.interval;
+ integ *= st->param.gr;
+ sval = st->param.tmax - ((integ >> 20) & 0xffffffff);
+ adj = min(st->param.ttarget, sval);
+
+ DBG("integ: %lx, sval: %lx, adj: %lx\n", integ, sval, adj);
+
+ /* Calculate derivative term */
+ deriv = st->temps[st->tindex] -
+ st->temps[(st->tindex + 2 - 1) % 2];
+ deriv /= st->param.interval;
+ deriv *= st->param.gd;
+
+ /* Calculate proportional term */
+ prop = (new_temp - adj);
+ prop *= st->param.gp;
+
+ DBG("deriv: %lx, prop: %lx\n", deriv, prop);
+
+ /* Calculate target */
+ target = st->target + (s32)((deriv + prop) >> 36);
+ target = max(target, st->param.min);
+ target = min(target, st->param.max);
+ st->target = target;
+
+ return st->target;
+}
+EXPORT_SYMBOL_GPL(wf_cpu_pid_run);
--- /dev/null
+/*
+ * Windfarm PowerMac thermal control. Generic PID helpers
+ *
+ * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ *
+ * Released under the term of the GNU GPL v2.
+ *
+ * This is a pair of generic PID helpers that can be used by
+ * control loops. One is the basic PID implementation, the
+ * other one is more specifically tailored to the loops used
+ * for CPU control with 2 input sample types (temp and power)
+ */
+
+/*
+ * *** Simple PID ***
+ */
+
+#define WF_PID_MAX_HISTORY 32
+
+/* This parameter array is passed to the PID algorithm. Currently,
+ * we don't support changing parameters on the fly as it's not needed
+ * but could be implemented (with necessary adjustment of the history
+ * buffer
+ */
+struct wf_pid_param {
+ int interval; /* Interval between samples in seconds */
+ int history_len; /* Size of history buffer */
+ int additive; /* 1: target relative to previous value */
+ s32 gd, gp, gr; /* PID gains */
+ s32 itarget; /* PID input target */
+ s32 min,max; /* min and max target values */
+};
+
+struct wf_pid_state {
+ int first; /* first run of the loop */
+ int index; /* index of current sample */
+ s32 target; /* current target value */
+ s32 samples[WF_PID_MAX_HISTORY]; /* samples history buffer */
+ s32 errors[WF_PID_MAX_HISTORY]; /* error history buffer */
+
+ struct wf_pid_param param;
+};
+
+extern void wf_pid_init(struct wf_pid_state *st, struct wf_pid_param *param);
+extern s32 wf_pid_run(struct wf_pid_state *st, s32 sample);
+
+
+/*
+ * *** CPU PID ***
+ */
+
+#define WF_CPU_PID_MAX_HISTORY 32
+
+/* This parameter array is passed to the CPU PID algorithm. Currently,
+ * we don't support changing parameters on the fly as it's not needed
+ * but could be implemented (with necessary adjustment of the history
+ * buffer
+ */
+struct wf_cpu_pid_param {
+ int interval; /* Interval between samples in seconds */
+ int history_len; /* Size of history buffer */
+ s32 gd, gp, gr; /* PID gains */
+ s32 pmaxadj; /* PID max power adjust */
+ s32 ttarget; /* PID input target */
+ s32 tmax; /* PID input max */
+ s32 min,max; /* min and max target values */
+};
+
+struct wf_cpu_pid_state {
+ int first; /* first run of the loop */
+ int index; /* index of current power */
+ int tindex; /* index of current temp */
+ s32 target; /* current target value */
+ s32 powers[WF_PID_MAX_HISTORY]; /* power history buffer */
+ s32 errors[WF_PID_MAX_HISTORY]; /* error history buffer */
+ s32 temps[2]; /* temp. history buffer */
+
+ struct wf_cpu_pid_param param;
+};
+
+extern void wf_cpu_pid_init(struct wf_cpu_pid_state *st,
+ struct wf_cpu_pid_param *param);
+extern s32 wf_cpu_pid_run(struct wf_cpu_pid_state *st, s32 power, s32 temp);
--- /dev/null
+/*
+ * Windfarm PowerMac thermal control. iMac G5
+ *
+ * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ *
+ * Released under the term of the GNU GPL v2.
+ *
+ * The algorithm used is the PID control algorithm, used the same
+ * way the published Darwin code does, using the same values that
+ * are present in the Darwin 8.2 snapshot property lists (note however
+ * that none of the code has been re-used, it's a complete re-implementation
+ *
+ * The various control loops found in Darwin config file are:
+ *
+ * PowerMac8,1 and PowerMac8,2
+ * ===========================
+ *
+ * System Fans control loop. Different based on models. In addition to the
+ * usual PID algorithm, the control loop gets 2 additional pairs of linear
+ * scaling factors (scale/offsets) expressed as 4.12 fixed point values
+ * signed offset, unsigned scale)
+ *
+ * The targets are modified such as:
+ * - the linked control (second control) gets the target value as-is
+ * (typically the drive fan)
+ * - the main control (first control) gets the target value scaled with
+ * the first pair of factors, and is then modified as below
+ * - the value of the target of the CPU Fan control loop is retreived,
+ * scaled with the second pair of factors, and the max of that and
+ * the scaled target is applied to the main control.
+ *
+ * # model_id: 2
+ * controls : system-fan, drive-bay-fan
+ * sensors : hd-temp
+ * PID params : G_d = 0x15400000
+ * G_p = 0x00200000
+ * G_r = 0x000002fd
+ * History = 2 entries
+ * Input target = 0x3a0000
+ * Interval = 5s
+ * linear-factors : offset = 0xff38 scale = 0x0ccd
+ * offset = 0x0208 scale = 0x07ae
+ *
+ * # model_id: 3
+ * controls : system-fan, drive-bay-fan
+ * sensors : hd-temp
+ * PID params : G_d = 0x08e00000
+ * G_p = 0x00566666
+ * G_r = 0x0000072b
+ * History = 2 entries
+ * Input target = 0x350000
+ * Interval = 5s
+ * linear-factors : offset = 0xff38 scale = 0x0ccd
+ * offset = 0x0000 scale = 0x0000
+ *
+ * # model_id: 5
+ * controls : system-fan
+ * sensors : hd-temp
+ * PID params : G_d = 0x15400000
+ * G_p = 0x00233333
+ * G_r = 0x000002fd
+ * History = 2 entries
+ * Input target = 0x3a0000
+ * Interval = 5s
+ * linear-factors : offset = 0x0000 scale = 0x1000
+ * offset = 0x0091 scale = 0x0bae
+ *
+ * CPU Fan control loop. The loop is identical for all models. it
+ * has an additional pair of scaling factor. This is used to scale the
+ * systems fan control loop target result (the one before it gets scaled
+ * by the System Fans control loop itself). Then, the max value of the
+ * calculated target value and system fan value is sent to the fans
+ *
+ * controls : cpu-fan
+ * sensors : cpu-temp cpu-power
+ * PID params : From SMU sdb partition
+ * linear-factors : offset = 0xfb50 scale = 0x1000
+ *
+ * CPU Slew control loop. Not implemented. The cpufreq driver in linux is
+ * completely separate for now, though we could find a way to link it, either
+ * as a client reacting to overtemp notifications, or directling monitoring
+ * the CPU temperature
+ *
+ * WARNING ! The CPU control loop requires the CPU tmax for the current
+ * operating point. However, we currently are completely separated from
+ * the cpufreq driver and thus do not know what the current operating
+ * point is. Fortunately, we also do not have any hardware supporting anything
+ * but operating point 0 at the moment, thus we just peek that value directly
+ * from the SDB partition. If we ever end up with actually slewing the system
+ * clock and thus changing operating points, we'll have to find a way to
+ * communicate with the CPU freq driver;
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <linux/kmod.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/sections.h>
+#include <asm/smu.h>
+
+#include "windfarm.h"
+#include "windfarm_pid.h"
+
+#define VERSION "0.4"
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(args...) printk(args)
+#else
+#define DBG(args...) do { } while(0)
+#endif
+
+/* define this to force CPU overtemp to 74 degree, useful for testing
+ * the overtemp code
+ */
+#undef HACKED_OVERTEMP
+
+static int wf_smu_mach_model; /* machine model id */
+
+static struct device *wf_smu_dev;
+
+/* Controls & sensors */
+static struct wf_sensor *sensor_cpu_power;
+static struct wf_sensor *sensor_cpu_temp;
+static struct wf_sensor *sensor_hd_temp;
+static struct wf_control *fan_cpu_main;
+static struct wf_control *fan_hd;
+static struct wf_control *fan_system;
+static struct wf_control *cpufreq_clamp;
+
+/* Set to kick the control loop into life */
+static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
+
+/* Failure handling.. could be nicer */
+#define FAILURE_FAN 0x01
+#define FAILURE_SENSOR 0x02
+#define FAILURE_OVERTEMP 0x04
+
+static unsigned int wf_smu_failure_state;
+static int wf_smu_readjust, wf_smu_skipping;
+
+/*
+ * ****** System Fans Control Loop ******
+ *
+ */
+
+/* Parameters for the System Fans control loop. Parameters
+ * not in this table such as interval, history size, ...
+ * are common to all versions and thus hard coded for now.
+ */
+struct wf_smu_sys_fans_param {
+ int model_id;
+ s32 itarget;
+ s32 gd, gp, gr;
+
+ s16 offset0;
+ u16 scale0;
+ s16 offset1;
+ u16 scale1;
+};
+
+#define WF_SMU_SYS_FANS_INTERVAL 5
+#define WF_SMU_SYS_FANS_HISTORY_SIZE 2
+
+/* State data used by the system fans control loop
+ */
+struct wf_smu_sys_fans_state {
+ int ticks;
+ s32 sys_setpoint;
+ s32 hd_setpoint;
+ s16 offset0;
+ u16 scale0;
+ s16 offset1;
+ u16 scale1;
+ struct wf_pid_state pid;
+};
+
+/*
+ * Configs for SMU Sytem Fan control loop
+ */
+static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = {
+ /* Model ID 2 */
+ {
+ .model_id = 2,
+ .itarget = 0x3a0000,
+ .gd = 0x15400000,
+ .gp = 0x00200000,
+ .gr = 0x000002fd,
+ .offset0 = 0xff38,
+ .scale0 = 0x0ccd,
+ .offset1 = 0x0208,
+ .scale1 = 0x07ae,
+ },
+ /* Model ID 3 */
+ {
+ .model_id = 2,
+ .itarget = 0x350000,
+ .gd = 0x08e00000,
+ .gp = 0x00566666,
+ .gr = 0x0000072b,
+ .offset0 = 0xff38,
+ .scale0 = 0x0ccd,
+ .offset1 = 0x0000,
+ .scale1 = 0x0000,
+ },
+ /* Model ID 5 */
+ {
+ .model_id = 2,
+ .itarget = 0x3a0000,
+ .gd = 0x15400000,
+ .gp = 0x00233333,
+ .gr = 0x000002fd,
+ .offset0 = 0x0000,
+ .scale0 = 0x1000,
+ .offset1 = 0x0091,
+ .scale1 = 0x0bae,
+ },
+};
+#define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params)
+
+static struct wf_smu_sys_fans_state *wf_smu_sys_fans;
+
+/*
+ * ****** CPU Fans Control Loop ******
+ *
+ */
+
+
+#define WF_SMU_CPU_FANS_INTERVAL 1
+#define WF_SMU_CPU_FANS_MAX_HISTORY 16
+#define WF_SMU_CPU_FANS_SIBLING_SCALE 0x00001000
+#define WF_SMU_CPU_FANS_SIBLING_OFFSET 0xfffffb50
+
+/* State data used by the cpu fans control loop
+ */
+struct wf_smu_cpu_fans_state {
+ int ticks;
+ s32 cpu_setpoint;
+ s32 scale;
+ s32 offset;
+ struct wf_cpu_pid_state pid;
+};
+
+static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
+
+
+
+/*
+ * ***** Implementation *****
+ *
+ */
+
+static void wf_smu_create_sys_fans(void)
+{
+ struct wf_smu_sys_fans_param *param = NULL;
+ struct wf_pid_param pid_param;
+ int i;
+
+ /* First, locate the params for this model */
+ for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++)
+ if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) {
+ param = &wf_smu_sys_all_params[i];
+ break;
+ }
+
+ /* No params found, put fans to max */
+ if (param == NULL) {
+ printk(KERN_WARNING "windfarm: System fan config not found "
+ "for this machine model, max fan speed\n");
+ goto fail;
+ }
+
+ /* Alloc & initialize state */
+ wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state),
+ GFP_KERNEL);
+ if (wf_smu_sys_fans == NULL) {
+ printk(KERN_WARNING "windfarm: Memory allocation error"
+ " max fan speed\n");
+ goto fail;
+ }
+ wf_smu_sys_fans->ticks = 1;
+ wf_smu_sys_fans->scale0 = param->scale0;
+ wf_smu_sys_fans->offset0 = param->offset0;
+ wf_smu_sys_fans->scale1 = param->scale1;
+ wf_smu_sys_fans->offset1 = param->offset1;
+
+ /* Fill PID params */
+ pid_param.gd = param->gd;
+ pid_param.gp = param->gp;
+ pid_param.gr = param->gr;
+ pid_param.interval = WF_SMU_SYS_FANS_INTERVAL;
+ pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE;
+ pid_param.itarget = param->itarget;
+ pid_param.min = fan_system->ops->get_min(fan_system);
+ pid_param.max = fan_system->ops->get_max(fan_system);
+ if (fan_hd) {
+ pid_param.min =
+ max(pid_param.min,fan_hd->ops->get_min(fan_hd));
+ pid_param.max =
+ min(pid_param.max,fan_hd->ops->get_max(fan_hd));
+ }
+ wf_pid_init(&wf_smu_sys_fans->pid, &pid_param);
+
+ DBG("wf: System Fan control initialized.\n");
+ DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
+ FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max);
+ return;
+
+ fail:
+
+ if (fan_system)
+ wf_control_set_max(fan_system);
+ if (fan_hd)
+ wf_control_set_max(fan_hd);
+}
+
+static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st)
+{
+ s32 new_setpoint, temp, scaled, cputarget;
+ int rc;
+
+ if (--st->ticks != 0) {
+ if (wf_smu_readjust)
+ goto readjust;
+ return;
+ }
+ st->ticks = WF_SMU_SYS_FANS_INTERVAL;
+
+ rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
+ rc);
+ wf_smu_failure_state |= FAILURE_SENSOR;
+ return;
+ }
+
+ DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n",
+ FIX32TOPRINT(temp));
+
+ if (temp > (st->pid.param.itarget + 0x50000))
+ wf_smu_failure_state |= FAILURE_OVERTEMP;
+
+ new_setpoint = wf_pid_run(&st->pid, temp);
+
+ DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
+
+ scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0;
+
+ DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled);
+
+ cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0;
+ cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1;
+ scaled = max(scaled, cputarget);
+ scaled = max(scaled, st->pid.param.min);
+ scaled = min(scaled, st->pid.param.max);
+
+ DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled);
+
+ if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint)
+ return;
+ st->sys_setpoint = scaled;
+ st->hd_setpoint = new_setpoint;
+ readjust:
+ if (fan_system && wf_smu_failure_state == 0) {
+ rc = fan_system->ops->set_value(fan_system, st->sys_setpoint);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: Sys fan error %d\n",
+ rc);
+ wf_smu_failure_state |= FAILURE_FAN;
+ }
+ }
+ if (fan_hd && wf_smu_failure_state == 0) {
+ rc = fan_hd->ops->set_value(fan_hd, st->hd_setpoint);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: HD fan error %d\n",
+ rc);
+ wf_smu_failure_state |= FAILURE_FAN;
+ }
+ }
+}
+
+static void wf_smu_create_cpu_fans(void)
+{
+ struct wf_cpu_pid_param pid_param;
+ struct smu_sdbp_header *hdr;
+ struct smu_sdbp_cpupiddata *piddata;
+ struct smu_sdbp_fvt *fvt;
+ s32 tmax, tdelta, maxpow, powadj;
+
+ /* First, locate the PID params in SMU SBD */
+ hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
+ if (hdr == 0) {
+ printk(KERN_WARNING "windfarm: CPU PID fan config not found "
+ "max fan speed\n");
+ goto fail;
+ }
+ piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
+
+ /* Get the FVT params for operating point 0 (the only supported one
+ * for now) in order to get tmax
+ */
+ hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
+ if (hdr) {
+ fvt = (struct smu_sdbp_fvt *)&hdr[1];
+ tmax = ((s32)fvt->maxtemp) << 16;
+ } else
+ tmax = 0x5e0000; /* 94 degree default */
+
+ /* Alloc & initialize state */
+ wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
+ GFP_KERNEL);
+ if (wf_smu_cpu_fans == NULL)
+ goto fail;
+ wf_smu_cpu_fans->ticks = 1;
+
+ wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE;
+ wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET;
+
+ /* Fill PID params */
+ pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
+ pid_param.history_len = piddata->history_len;
+ if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
+ printk(KERN_WARNING "windfarm: History size overflow on "
+ "CPU control loop (%d)\n", piddata->history_len);
+ pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
+ }
+ pid_param.gd = piddata->gd;
+ pid_param.gp = piddata->gp;
+ pid_param.gr = piddata->gr / pid_param.history_len;
+
+ tdelta = ((s32)piddata->target_temp_delta) << 16;
+ maxpow = ((s32)piddata->max_power) << 16;
+ powadj = ((s32)piddata->power_adj) << 16;
+
+ pid_param.tmax = tmax;
+ pid_param.ttarget = tmax - tdelta;
+ pid_param.pmaxadj = maxpow - powadj;
+
+ pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main);
+ pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main);
+
+ wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
+
+ DBG("wf: CPU Fan control initialized.\n");
+ DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
+ FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
+ pid_param.min, pid_param.max);
+
+ return;
+
+ fail:
+ printk(KERN_WARNING "windfarm: CPU fan config not found\n"
+ "for this machine model, max fan speed\n");
+
+ if (cpufreq_clamp)
+ wf_control_set_max(cpufreq_clamp);
+ if (fan_cpu_main)
+ wf_control_set_max(fan_cpu_main);
+}
+
+static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
+{
+ s32 new_setpoint, temp, power, systarget;
+ int rc;
+
+ if (--st->ticks != 0) {
+ if (wf_smu_readjust)
+ goto readjust;
+ return;
+ }
+ st->ticks = WF_SMU_CPU_FANS_INTERVAL;
+
+ rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
+ rc);
+ wf_smu_failure_state |= FAILURE_SENSOR;
+ return;
+ }
+
+ rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
+ rc);
+ wf_smu_failure_state |= FAILURE_SENSOR;
+ return;
+ }
+
+ DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
+ FIX32TOPRINT(temp), FIX32TOPRINT(power));
+
+#ifdef HACKED_OVERTEMP
+ if (temp > 0x4a0000)
+ wf_smu_failure_state |= FAILURE_OVERTEMP;
+#else
+ if (temp > st->pid.param.tmax)
+ wf_smu_failure_state |= FAILURE_OVERTEMP;
+#endif
+ new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
+
+ DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
+
+ systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0;
+ systarget = ((((s64)systarget) * (s64)st->scale) >> 12)
+ + st->offset;
+ new_setpoint = max(new_setpoint, systarget);
+ new_setpoint = max(new_setpoint, st->pid.param.min);
+ new_setpoint = min(new_setpoint, st->pid.param.max);
+
+ DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint);
+
+ if (st->cpu_setpoint == new_setpoint)
+ return;
+ st->cpu_setpoint = new_setpoint;
+ readjust:
+ if (fan_cpu_main && wf_smu_failure_state == 0) {
+ rc = fan_cpu_main->ops->set_value(fan_cpu_main,
+ st->cpu_setpoint);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: CPU main fan"
+ " error %d\n", rc);
+ wf_smu_failure_state |= FAILURE_FAN;
+ }
+ }
+}
+
+
+/*
+ * ****** Attributes ******
+ *
+ */
+
+#define BUILD_SHOW_FUNC_FIX(name, data) \
+static ssize_t show_##name(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ ssize_t r; \
+ s32 val = 0; \
+ data->ops->get_value(data, &val); \
+ r = sprintf(buf, "%d.%03d", FIX32TOPRINT(val)); \
+ return r; \
+} \
+static DEVICE_ATTR(name,S_IRUGO,show_##name, NULL);
+
+
+#define BUILD_SHOW_FUNC_INT(name, data) \
+static ssize_t show_##name(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ s32 val = 0; \
+ data->ops->get_value(data, &val); \
+ return sprintf(buf, "%d", val); \
+} \
+static DEVICE_ATTR(name,S_IRUGO,show_##name, NULL);
+
+BUILD_SHOW_FUNC_INT(cpu_fan, fan_cpu_main);
+BUILD_SHOW_FUNC_INT(sys_fan, fan_system);
+BUILD_SHOW_FUNC_INT(hd_fan, fan_hd);
+
+BUILD_SHOW_FUNC_FIX(cpu_temp, sensor_cpu_temp);
+BUILD_SHOW_FUNC_FIX(cpu_power, sensor_cpu_power);
+BUILD_SHOW_FUNC_FIX(hd_temp, sensor_hd_temp);
+
+/*
+ * ****** Setup / Init / Misc ... ******
+ *
+ */
+
+static void wf_smu_tick(void)
+{
+ unsigned int last_failure = wf_smu_failure_state;
+ unsigned int new_failure;
+
+ if (!wf_smu_started) {
+ DBG("wf: creating control loops !\n");
+ wf_smu_create_sys_fans();
+ wf_smu_create_cpu_fans();
+ wf_smu_started = 1;
+ }
+
+ /* Skipping ticks */
+ if (wf_smu_skipping && --wf_smu_skipping)
+ return;
+
+ wf_smu_failure_state = 0;
+ if (wf_smu_sys_fans)
+ wf_smu_sys_fans_tick(wf_smu_sys_fans);
+ if (wf_smu_cpu_fans)
+ wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
+
+ wf_smu_readjust = 0;
+ new_failure = wf_smu_failure_state & ~last_failure;
+
+ /* If entering failure mode, clamp cpufreq and ramp all
+ * fans to full speed.
+ */
+ if (wf_smu_failure_state && !last_failure) {
+ if (cpufreq_clamp)
+ wf_control_set_max(cpufreq_clamp);
+ if (fan_system)
+ wf_control_set_max(fan_system);
+ if (fan_cpu_main)
+ wf_control_set_max(fan_cpu_main);
+ if (fan_hd)
+ wf_control_set_max(fan_hd);
+ }
+
+ /* If leaving failure mode, unclamp cpufreq and readjust
+ * all fans on next iteration
+ */
+ if (!wf_smu_failure_state && last_failure) {
+ if (cpufreq_clamp)
+ wf_control_set_min(cpufreq_clamp);
+ wf_smu_readjust = 1;
+ }
+
+ /* Overtemp condition detected, notify and start skipping a couple
+ * ticks to let the temperature go down
+ */
+ if (new_failure & FAILURE_OVERTEMP) {
+ wf_set_overtemp();
+ wf_smu_skipping = 2;
+ }
+
+ /* We only clear the overtemp condition if overtemp is cleared
+ * _and_ no other failure is present. Since a sensor error will
+ * clear the overtemp condition (can't measure temperature) at
+ * the control loop levels, but we don't want to keep it clear
+ * here in this case
+ */
+ if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
+ wf_clear_overtemp();
+}
+
+static void wf_smu_new_control(struct wf_control *ct)
+{
+ if (wf_smu_all_controls_ok)
+ return;
+
+ if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) {
+ if (wf_get_control(ct) == 0) {
+ fan_cpu_main = ct;
+ device_create_file(wf_smu_dev, &dev_attr_cpu_fan);
+ }
+ }
+
+ if (fan_system == NULL && !strcmp(ct->name, "system-fan")) {
+ if (wf_get_control(ct) == 0) {
+ fan_system = ct;
+ device_create_file(wf_smu_dev, &dev_attr_sys_fan);
+ }
+ }
+
+ if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
+ if (wf_get_control(ct) == 0)
+ cpufreq_clamp = ct;
+ }
+
+ /* Darwin property list says the HD fan is only for model ID
+ * 0, 1, 2 and 3
+ */
+
+ if (wf_smu_mach_model > 3) {
+ if (fan_system && fan_cpu_main && cpufreq_clamp)
+ wf_smu_all_controls_ok = 1;
+ return;
+ }
+
+ if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
+ if (wf_get_control(ct) == 0) {
+ fan_hd = ct;
+ device_create_file(wf_smu_dev, &dev_attr_hd_fan);
+ }
+ }
+
+ if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp)
+ wf_smu_all_controls_ok = 1;
+}
+
+static void wf_smu_new_sensor(struct wf_sensor *sr)
+{
+ if (wf_smu_all_sensors_ok)
+ return;
+
+ if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
+ if (wf_get_sensor(sr) == 0) {
+ sensor_cpu_power = sr;
+ device_create_file(wf_smu_dev, &dev_attr_cpu_power);
+ }
+ }
+
+ if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
+ if (wf_get_sensor(sr) == 0) {
+ sensor_cpu_temp = sr;
+ device_create_file(wf_smu_dev, &dev_attr_cpu_temp);
+ }
+ }
+
+ if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
+ if (wf_get_sensor(sr) == 0) {
+ sensor_hd_temp = sr;
+ device_create_file(wf_smu_dev, &dev_attr_hd_temp);
+ }
+ }
+
+ if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp)
+ wf_smu_all_sensors_ok = 1;
+}
+
+
+static int wf_smu_notify(struct notifier_block *self,
+ unsigned long event, void *data)
+{
+ switch(event) {
+ case WF_EVENT_NEW_CONTROL:
+ DBG("wf: new control %s detected\n",
+ ((struct wf_control *)data)->name);
+ wf_smu_new_control(data);
+ wf_smu_readjust = 1;
+ break;
+ case WF_EVENT_NEW_SENSOR:
+ DBG("wf: new sensor %s detected\n",
+ ((struct wf_sensor *)data)->name);
+ wf_smu_new_sensor(data);
+ break;
+ case WF_EVENT_TICK:
+ if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
+ wf_smu_tick();
+ }
+
+ return 0;
+}
+
+static struct notifier_block wf_smu_events = {
+ .notifier_call = wf_smu_notify,
+};
+
+static int wf_init_pm(void)
+{
+ struct smu_sdbp_header *hdr;
+
+ hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
+ if (hdr != 0) {
+ struct smu_sdbp_sensortree *st =
+ (struct smu_sdbp_sensortree *)&hdr[1];
+ wf_smu_mach_model = st->model_id;
+ }
+
+ printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n",
+ wf_smu_mach_model);
+
+ return 0;
+}
+
+static int wf_smu_probe(struct device *ddev)
+{
+ wf_smu_dev = ddev;
+
+ wf_register_client(&wf_smu_events);
+
+ return 0;
+}
+
+static int wf_smu_remove(struct device *ddev)
+{
+ wf_unregister_client(&wf_smu_events);
+
+ /* XXX We don't have yet a guarantee that our callback isn't
+ * in progress when returning from wf_unregister_client, so
+ * we add an arbitrary delay. I'll have to fix that in the core
+ */
+ msleep(1000);
+
+ /* Release all sensors */
+ /* One more crappy race: I don't think we have any guarantee here
+ * that the attribute callback won't race with the sensor beeing
+ * disposed of, and I'm not 100% certain what best way to deal
+ * with that except by adding locks all over... I'll do that
+ * eventually but heh, who ever rmmod this module anyway ?
+ */
+ if (sensor_cpu_power) {
+ device_remove_file(wf_smu_dev, &dev_attr_cpu_power);
+ wf_put_sensor(sensor_cpu_power);
+ }
+ if (sensor_cpu_temp) {
+ device_remove_file(wf_smu_dev, &dev_attr_cpu_temp);
+ wf_put_sensor(sensor_cpu_temp);
+ }
+ if (sensor_hd_temp) {
+ device_remove_file(wf_smu_dev, &dev_attr_hd_temp);
+ wf_put_sensor(sensor_hd_temp);
+ }
+
+ /* Release all controls */
+ if (fan_cpu_main) {
+ device_remove_file(wf_smu_dev, &dev_attr_cpu_fan);
+ wf_put_control(fan_cpu_main);
+ }
+ if (fan_hd) {
+ device_remove_file(wf_smu_dev, &dev_attr_hd_fan);
+ wf_put_control(fan_hd);
+ }
+ if (fan_system) {
+ device_remove_file(wf_smu_dev, &dev_attr_sys_fan);
+ wf_put_control(fan_system);
+ }
+ if (cpufreq_clamp)
+ wf_put_control(cpufreq_clamp);
+
+ /* Destroy control loops state structures */
+ if (wf_smu_sys_fans)
+ kfree(wf_smu_sys_fans);
+ if (wf_smu_cpu_fans)
+ kfree(wf_smu_cpu_fans);
+
+ wf_smu_dev = NULL;
+
+ return 0;
+}
+
+static struct device_driver wf_smu_driver = {
+ .name = "windfarm",
+ .bus = &platform_bus_type,
+ .probe = wf_smu_probe,
+ .remove = wf_smu_remove,
+};
+
+
+static int __init wf_smu_init(void)
+{
+ int rc = -ENODEV;
+
+ if (machine_is_compatible("PowerMac8,1") ||
+ machine_is_compatible("PowerMac8,2"))
+ rc = wf_init_pm();
+
+ if (rc == 0) {
+#ifdef MODULE
+ request_module("windfarm_smu_controls");
+ request_module("windfarm_smu_sensors");
+ request_module("windfarm_lm75_sensor");
+
+#endif /* MODULE */
+ driver_register(&wf_smu_driver);
+ }
+
+ return rc;
+}
+
+static void __exit wf_smu_exit(void)
+{
+
+ driver_unregister(&wf_smu_driver);
+}
+
+
+module_init(wf_smu_init);
+module_exit(wf_smu_exit);
+
+MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
+MODULE_DESCRIPTION("Thermal control logic for iMac G5");
+MODULE_LICENSE("GPL");
+
--- /dev/null
+/*
+ * Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops
+ *
+ * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ *
+ * Released under the term of the GNU GPL v2.
+ *
+ * The algorithm used is the PID control algorithm, used the same
+ * way the published Darwin code does, using the same values that
+ * are present in the Darwin 8.2 snapshot property lists (note however
+ * that none of the code has been re-used, it's a complete re-implementation
+ *
+ * The various control loops found in Darwin config file are:
+ *
+ * PowerMac9,1
+ * ===========
+ *
+ * Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't
+ * try to play with other control loops fans). Drive bay is rather basic PID
+ * with one sensor and one fan. Slots area is a bit different as the Darwin
+ * driver is supposed to be capable of working in a special "AGP" mode which
+ * involves the presence of an AGP sensor and an AGP fan (possibly on the
+ * AGP card itself). I can't deal with that special mode as I don't have
+ * access to those additional sensor/fans for now (though ultimately, it would
+ * be possible to add sensor objects for them) so I'm only implementing the
+ * basic PCI slot control loop
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <linux/kmod.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/sections.h>
+#include <asm/smu.h>
+
+#include "windfarm.h"
+#include "windfarm_pid.h"
+
+#define VERSION "0.4"
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(args...) printk(args)
+#else
+#define DBG(args...) do { } while(0)
+#endif
+
+/* define this to force CPU overtemp to 74 degree, useful for testing
+ * the overtemp code
+ */
+#undef HACKED_OVERTEMP
+
+static struct device *wf_smu_dev;
+
+/* Controls & sensors */
+static struct wf_sensor *sensor_cpu_power;
+static struct wf_sensor *sensor_cpu_temp;
+static struct wf_sensor *sensor_hd_temp;
+static struct wf_sensor *sensor_slots_power;
+static struct wf_control *fan_cpu_main;
+static struct wf_control *fan_cpu_second;
+static struct wf_control *fan_cpu_third;
+static struct wf_control *fan_hd;
+static struct wf_control *fan_slots;
+static struct wf_control *cpufreq_clamp;
+
+/* Set to kick the control loop into life */
+static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
+
+/* Failure handling.. could be nicer */
+#define FAILURE_FAN 0x01
+#define FAILURE_SENSOR 0x02
+#define FAILURE_OVERTEMP 0x04
+
+static unsigned int wf_smu_failure_state;
+static int wf_smu_readjust, wf_smu_skipping;
+
+/*
+ * ****** CPU Fans Control Loop ******
+ *
+ */
+
+
+#define WF_SMU_CPU_FANS_INTERVAL 1
+#define WF_SMU_CPU_FANS_MAX_HISTORY 16
+
+/* State data used by the cpu fans control loop
+ */
+struct wf_smu_cpu_fans_state {
+ int ticks;
+ s32 cpu_setpoint;
+ struct wf_cpu_pid_state pid;
+};
+
+static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
+
+
+
+/*
+ * ****** Drive Fan Control Loop ******
+ *
+ */
+
+struct wf_smu_drive_fans_state {
+ int ticks;
+ s32 setpoint;
+ struct wf_pid_state pid;
+};
+
+static struct wf_smu_drive_fans_state *wf_smu_drive_fans;
+
+/*
+ * ****** Slots Fan Control Loop ******
+ *
+ */
+
+struct wf_smu_slots_fans_state {
+ int ticks;
+ s32 setpoint;
+ struct wf_pid_state pid;
+};
+
+static struct wf_smu_slots_fans_state *wf_smu_slots_fans;
+
+/*
+ * ***** Implementation *****
+ *
+ */
+
+
+static void wf_smu_create_cpu_fans(void)
+{
+ struct wf_cpu_pid_param pid_param;
+ struct smu_sdbp_header *hdr;
+ struct smu_sdbp_cpupiddata *piddata;
+ struct smu_sdbp_fvt *fvt;
+ s32 tmax, tdelta, maxpow, powadj;
+
+ /* First, locate the PID params in SMU SBD */
+ hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
+ if (hdr == 0) {
+ printk(KERN_WARNING "windfarm: CPU PID fan config not found "
+ "max fan speed\n");
+ goto fail;
+ }
+ piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
+
+ /* Get the FVT params for operating point 0 (the only supported one
+ * for now) in order to get tmax
+ */
+ hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
+ if (hdr) {
+ fvt = (struct smu_sdbp_fvt *)&hdr[1];
+ tmax = ((s32)fvt->maxtemp) << 16;
+ } else
+ tmax = 0x5e0000; /* 94 degree default */
+
+ /* Alloc & initialize state */
+ wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
+ GFP_KERNEL);
+ if (wf_smu_cpu_fans == NULL)
+ goto fail;
+ wf_smu_cpu_fans->ticks = 1;
+
+ /* Fill PID params */
+ pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
+ pid_param.history_len = piddata->history_len;
+ if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
+ printk(KERN_WARNING "windfarm: History size overflow on "
+ "CPU control loop (%d)\n", piddata->history_len);
+ pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
+ }
+ pid_param.gd = piddata->gd;
+ pid_param.gp = piddata->gp;
+ pid_param.gr = piddata->gr / pid_param.history_len;
+
+ tdelta = ((s32)piddata->target_temp_delta) << 16;
+ maxpow = ((s32)piddata->max_power) << 16;
+ powadj = ((s32)piddata->power_adj) << 16;
+
+ pid_param.tmax = tmax;
+ pid_param.ttarget = tmax - tdelta;
+ pid_param.pmaxadj = maxpow - powadj;
+
+ pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main);
+ pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main);
+
+ wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
+
+ DBG("wf: CPU Fan control initialized.\n");
+ DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
+ FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
+ pid_param.min, pid_param.max);
+
+ return;
+
+ fail:
+ printk(KERN_WARNING "windfarm: CPU fan config not found\n"
+ "for this machine model, max fan speed\n");
+
+ if (cpufreq_clamp)
+ wf_control_set_max(cpufreq_clamp);
+ if (fan_cpu_main)
+ wf_control_set_max(fan_cpu_main);
+}
+
+static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
+{
+ s32 new_setpoint, temp, power;
+ int rc;
+
+ if (--st->ticks != 0) {
+ if (wf_smu_readjust)
+ goto readjust;
+ return;
+ }
+ st->ticks = WF_SMU_CPU_FANS_INTERVAL;
+
+ rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
+ rc);
+ wf_smu_failure_state |= FAILURE_SENSOR;
+ return;
+ }
+
+ rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
+ rc);
+ wf_smu_failure_state |= FAILURE_SENSOR;
+ return;
+ }
+
+ DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
+ FIX32TOPRINT(temp), FIX32TOPRINT(power));
+
+#ifdef HACKED_OVERTEMP
+ if (temp > 0x4a0000)
+ wf_smu_failure_state |= FAILURE_OVERTEMP;
+#else
+ if (temp > st->pid.param.tmax)
+ wf_smu_failure_state |= FAILURE_OVERTEMP;
+#endif
+ new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
+
+ DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
+
+ if (st->cpu_setpoint == new_setpoint)
+ return;
+ st->cpu_setpoint = new_setpoint;
+ readjust:
+ if (fan_cpu_main && wf_smu_failure_state == 0) {
+ rc = fan_cpu_main->ops->set_value(fan_cpu_main,
+ st->cpu_setpoint);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: CPU main fan"
+ " error %d\n", rc);
+ wf_smu_failure_state |= FAILURE_FAN;
+ }
+ }
+ if (fan_cpu_second && wf_smu_failure_state == 0) {
+ rc = fan_cpu_second->ops->set_value(fan_cpu_second,
+ st->cpu_setpoint);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: CPU second fan"
+ " error %d\n", rc);
+ wf_smu_failure_state |= FAILURE_FAN;
+ }
+ }
+ if (fan_cpu_third && wf_smu_failure_state == 0) {
+ rc = fan_cpu_main->ops->set_value(fan_cpu_third,
+ st->cpu_setpoint);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: CPU third fan"
+ " error %d\n", rc);
+ wf_smu_failure_state |= FAILURE_FAN;
+ }
+ }
+}
+
+static void wf_smu_create_drive_fans(void)
+{
+ struct wf_pid_param param = {
+ .interval = 5,
+ .history_len = 2,
+ .gd = 0x01e00000,
+ .gp = 0x00500000,
+ .gr = 0x00000000,
+ .itarget = 0x00200000,
+ };
+
+ /* Alloc & initialize state */
+ wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
+ GFP_KERNEL);
+ if (wf_smu_drive_fans == NULL) {
+ printk(KERN_WARNING "windfarm: Memory allocation error"
+ " max fan speed\n");
+ goto fail;
+ }
+ wf_smu_drive_fans->ticks = 1;
+
+ /* Fill PID params */
+ param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
+ param.min = fan_hd->ops->get_min(fan_hd);
+ param.max = fan_hd->ops->get_max(fan_hd);
+ wf_pid_init(&wf_smu_drive_fans->pid, ¶m);
+
+ DBG("wf: Drive Fan control initialized.\n");
+ DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
+ FIX32TOPRINT(param.itarget), param.min, param.max);
+ return;
+
+ fail:
+ if (fan_hd)
+ wf_control_set_max(fan_hd);
+}
+
+static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
+{
+ s32 new_setpoint, temp;
+ int rc;
+
+ if (--st->ticks != 0) {
+ if (wf_smu_readjust)
+ goto readjust;
+ return;
+ }
+ st->ticks = st->pid.param.interval;
+
+ rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
+ rc);
+ wf_smu_failure_state |= FAILURE_SENSOR;
+ return;
+ }
+
+ DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n",
+ FIX32TOPRINT(temp));
+
+ if (temp > (st->pid.param.itarget + 0x50000))
+ wf_smu_failure_state |= FAILURE_OVERTEMP;
+
+ new_setpoint = wf_pid_run(&st->pid, temp);
+
+ DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
+
+ if (st->setpoint == new_setpoint)
+ return;
+ st->setpoint = new_setpoint;
+ readjust:
+ if (fan_hd && wf_smu_failure_state == 0) {
+ rc = fan_hd->ops->set_value(fan_hd, st->setpoint);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: HD fan error %d\n",
+ rc);
+ wf_smu_failure_state |= FAILURE_FAN;
+ }
+ }
+}
+
+static void wf_smu_create_slots_fans(void)
+{
+ struct wf_pid_param param = {
+ .interval = 1,
+ .history_len = 8,
+ .gd = 0x00000000,
+ .gp = 0x00000000,
+ .gr = 0x00020000,
+ .itarget = 0x00000000
+ };
+
+ /* Alloc & initialize state */
+ wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
+ GFP_KERNEL);
+ if (wf_smu_slots_fans == NULL) {
+ printk(KERN_WARNING "windfarm: Memory allocation error"
+ " max fan speed\n");
+ goto fail;
+ }
+ wf_smu_slots_fans->ticks = 1;
+
+ /* Fill PID params */
+ param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
+ param.min = fan_slots->ops->get_min(fan_slots);
+ param.max = fan_slots->ops->get_max(fan_slots);
+ wf_pid_init(&wf_smu_slots_fans->pid, ¶m);
+
+ DBG("wf: Slots Fan control initialized.\n");
+ DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
+ FIX32TOPRINT(param.itarget), param.min, param.max);
+ return;
+
+ fail:
+ if (fan_slots)
+ wf_control_set_max(fan_slots);
+}
+
+static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
+{
+ s32 new_setpoint, power;
+ int rc;
+
+ if (--st->ticks != 0) {
+ if (wf_smu_readjust)
+ goto readjust;
+ return;
+ }
+ st->ticks = st->pid.param.interval;
+
+ rc = sensor_slots_power->ops->get_value(sensor_slots_power, &power);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
+ rc);
+ wf_smu_failure_state |= FAILURE_SENSOR;
+ return;
+ }
+
+ DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
+ FIX32TOPRINT(power));
+
+#if 0 /* Check what makes a good overtemp condition */
+ if (power > (st->pid.param.itarget + 0x50000))
+ wf_smu_failure_state |= FAILURE_OVERTEMP;
+#endif
+
+ new_setpoint = wf_pid_run(&st->pid, power);
+
+ DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
+
+ if (st->setpoint == new_setpoint)
+ return;
+ st->setpoint = new_setpoint;
+ readjust:
+ if (fan_slots && wf_smu_failure_state == 0) {
+ rc = fan_slots->ops->set_value(fan_slots, st->setpoint);
+ if (rc) {
+ printk(KERN_WARNING "windfarm: Slots fan error %d\n",
+ rc);
+ wf_smu_failure_state |= FAILURE_FAN;
+ }
+ }
+}
+
+
+/*
+ * ****** Attributes ******
+ *
+ */
+
+#define BUILD_SHOW_FUNC_FIX(name, data) \
+static ssize_t show_##name(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ ssize_t r; \
+ s32 val = 0; \
+ data->ops->get_value(data, &val); \
+ r = sprintf(buf, "%d.%03d", FIX32TOPRINT(val)); \
+ return r; \
+} \
+static DEVICE_ATTR(name,S_IRUGO,show_##name, NULL);
+
+
+#define BUILD_SHOW_FUNC_INT(name, data) \
+static ssize_t show_##name(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ s32 val = 0; \
+ data->ops->get_value(data, &val); \
+ return sprintf(buf, "%d", val); \
+} \
+static DEVICE_ATTR(name,S_IRUGO,show_##name, NULL);
+
+BUILD_SHOW_FUNC_INT(cpu_fan, fan_cpu_main);
+BUILD_SHOW_FUNC_INT(hd_fan, fan_hd);
+BUILD_SHOW_FUNC_INT(slots_fan, fan_slots);
+
+BUILD_SHOW_FUNC_FIX(cpu_temp, sensor_cpu_temp);
+BUILD_SHOW_FUNC_FIX(cpu_power, sensor_cpu_power);
+BUILD_SHOW_FUNC_FIX(hd_temp, sensor_hd_temp);
+BUILD_SHOW_FUNC_FIX(slots_power, sensor_slots_power);
+
+/*
+ * ****** Setup / Init / Misc ... ******
+ *
+ */
+
+static void wf_smu_tick(void)
+{
+ unsigned int last_failure = wf_smu_failure_state;
+ unsigned int new_failure;
+
+ if (!wf_smu_started) {
+ DBG("wf: creating control loops !\n");
+ wf_smu_create_drive_fans();
+ wf_smu_create_slots_fans();
+ wf_smu_create_cpu_fans();
+ wf_smu_started = 1;
+ }
+
+ /* Skipping ticks */
+ if (wf_smu_skipping && --wf_smu_skipping)
+ return;
+
+ wf_smu_failure_state = 0;
+ if (wf_smu_drive_fans)
+ wf_smu_drive_fans_tick(wf_smu_drive_fans);
+ if (wf_smu_slots_fans)
+ wf_smu_slots_fans_tick(wf_smu_slots_fans);
+ if (wf_smu_cpu_fans)
+ wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
+
+ wf_smu_readjust = 0;
+ new_failure = wf_smu_failure_state & ~last_failure;
+
+ /* If entering failure mode, clamp cpufreq and ramp all
+ * fans to full speed.
+ */
+ if (wf_smu_failure_state && !last_failure) {
+ if (cpufreq_clamp)
+ wf_control_set_max(cpufreq_clamp);
+ if (fan_cpu_main)
+ wf_control_set_max(fan_cpu_main);
+ if (fan_cpu_second)
+ wf_control_set_max(fan_cpu_second);
+ if (fan_cpu_third)
+ wf_control_set_max(fan_cpu_third);
+ if (fan_hd)
+ wf_control_set_max(fan_hd);
+ if (fan_slots)
+ wf_control_set_max(fan_slots);
+ }
+
+ /* If leaving failure mode, unclamp cpufreq and readjust
+ * all fans on next iteration
+ */
+ if (!wf_smu_failure_state && last_failure) {
+ if (cpufreq_clamp)
+ wf_control_set_min(cpufreq_clamp);
+ wf_smu_readjust = 1;
+ }
+
+ /* Overtemp condition detected, notify and start skipping a couple
+ * ticks to let the temperature go down
+ */
+ if (new_failure & FAILURE_OVERTEMP) {
+ wf_set_overtemp();
+ wf_smu_skipping = 2;
+ }
+
+ /* We only clear the overtemp condition if overtemp is cleared
+ * _and_ no other failure is present. Since a sensor error will
+ * clear the overtemp condition (can't measure temperature) at
+ * the control loop levels, but we don't want to keep it clear
+ * here in this case
+ */
+ if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
+ wf_clear_overtemp();
+}
+
+
+static void wf_smu_new_control(struct wf_control *ct)
+{
+ if (wf_smu_all_controls_ok)
+ return;
+
+ if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) {
+ if (wf_get_control(ct) == 0) {
+ fan_cpu_main = ct;
+ device_create_file(wf_smu_dev, &dev_attr_cpu_fan);
+ }
+ }
+
+ if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) {
+ if (wf_get_control(ct) == 0)
+ fan_cpu_second = ct;
+ }
+
+ if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) {
+ if (wf_get_control(ct) == 0)
+ fan_cpu_third = ct;
+ }
+
+ if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
+ if (wf_get_control(ct) == 0)
+ cpufreq_clamp = ct;
+ }
+
+ if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
+ if (wf_get_control(ct) == 0) {
+ fan_hd = ct;
+ device_create_file(wf_smu_dev, &dev_attr_hd_fan);
+ }
+ }
+
+ if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
+ if (wf_get_control(ct) == 0) {
+ fan_slots = ct;
+ device_create_file(wf_smu_dev, &dev_attr_slots_fan);
+ }
+ }
+
+ if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd &&
+ fan_slots && cpufreq_clamp)
+ wf_smu_all_controls_ok = 1;
+}
+
+static void wf_smu_new_sensor(struct wf_sensor *sr)
+{
+ if (wf_smu_all_sensors_ok)
+ return;
+
+ if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
+ if (wf_get_sensor(sr) == 0) {
+ sensor_cpu_power = sr;
+ device_create_file(wf_smu_dev, &dev_attr_cpu_power);
+ }
+ }
+
+ if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
+ if (wf_get_sensor(sr) == 0) {
+ sensor_cpu_temp = sr;
+ device_create_file(wf_smu_dev, &dev_attr_cpu_temp);
+ }
+ }
+
+ if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
+ if (wf_get_sensor(sr) == 0) {
+ sensor_hd_temp = sr;
+ device_create_file(wf_smu_dev, &dev_attr_hd_temp);
+ }
+ }
+
+ if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
+ if (wf_get_sensor(sr) == 0) {
+ sensor_slots_power = sr;
+ device_create_file(wf_smu_dev, &dev_attr_slots_power);
+ }
+ }
+
+ if (sensor_cpu_power && sensor_cpu_temp &&
+ sensor_hd_temp && sensor_slots_power)
+ wf_smu_all_sensors_ok = 1;
+}
+
+
+static int wf_smu_notify(struct notifier_block *self,
+ unsigned long event, void *data)
+{
+ switch(event) {
+ case WF_EVENT_NEW_CONTROL:
+ DBG("wf: new control %s detected\n",
+ ((struct wf_control *)data)->name);
+ wf_smu_new_control(data);
+ wf_smu_readjust = 1;
+ break;
+ case WF_EVENT_NEW_SENSOR:
+ DBG("wf: new sensor %s detected\n",
+ ((struct wf_sensor *)data)->name);
+ wf_smu_new_sensor(data);
+ break;
+ case WF_EVENT_TICK:
+ if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
+ wf_smu_tick();
+ }
+
+ return 0;
+}
+
+static struct notifier_block wf_smu_events = {
+ .notifier_call = wf_smu_notify,
+};
+
+static int wf_init_pm(void)
+{
+ printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n");
+
+ return 0;
+}
+
+static int wf_smu_probe(struct device *ddev)
+{
+ wf_smu_dev = ddev;
+
+ wf_register_client(&wf_smu_events);
+
+ return 0;
+}
+
+static int wf_smu_remove(struct device *ddev)
+{
+ wf_unregister_client(&wf_smu_events);
+
+ /* XXX We don't have yet a guarantee that our callback isn't
+ * in progress when returning from wf_unregister_client, so
+ * we add an arbitrary delay. I'll have to fix that in the core
+ */
+ msleep(1000);
+
+ /* Release all sensors */
+ /* One more crappy race: I don't think we have any guarantee here
+ * that the attribute callback won't race with the sensor beeing
+ * disposed of, and I'm not 100% certain what best way to deal
+ * with that except by adding locks all over... I'll do that
+ * eventually but heh, who ever rmmod this module anyway ?
+ */
+ if (sensor_cpu_power) {
+ device_remove_file(wf_smu_dev, &dev_attr_cpu_power);
+ wf_put_sensor(sensor_cpu_power);
+ }
+ if (sensor_cpu_temp) {
+ device_remove_file(wf_smu_dev, &dev_attr_cpu_temp);
+ wf_put_sensor(sensor_cpu_temp);
+ }
+ if (sensor_hd_temp) {
+ device_remove_file(wf_smu_dev, &dev_attr_hd_temp);
+ wf_put_sensor(sensor_hd_temp);
+ }
+ if (sensor_slots_power) {
+ device_remove_file(wf_smu_dev, &dev_attr_slots_power);
+ wf_put_sensor(sensor_slots_power);
+ }
+
+ /* Release all controls */
+ if (fan_cpu_main) {
+ device_remove_file(wf_smu_dev, &dev_attr_cpu_fan);
+ wf_put_control(fan_cpu_main);
+ }
+ if (fan_cpu_second)
+ wf_put_control(fan_cpu_second);
+ if (fan_cpu_third)
+ wf_put_control(fan_cpu_third);
+ if (fan_hd) {
+ device_remove_file(wf_smu_dev, &dev_attr_hd_fan);
+ wf_put_control(fan_hd);
+ }
+ if (fan_slots) {
+ device_remove_file(wf_smu_dev, &dev_attr_slots_fan);
+ wf_put_control(fan_slots);
+ }
+ if (cpufreq_clamp)
+ wf_put_control(cpufreq_clamp);
+
+ /* Destroy control loops state structures */
+ if (wf_smu_slots_fans)
+ kfree(wf_smu_cpu_fans);
+ if (wf_smu_drive_fans)
+ kfree(wf_smu_cpu_fans);
+ if (wf_smu_cpu_fans)
+ kfree(wf_smu_cpu_fans);
+
+ wf_smu_dev = NULL;
+
+ return 0;
+}
+
+static struct device_driver wf_smu_driver = {
+ .name = "windfarm",
+ .bus = &platform_bus_type,
+ .probe = wf_smu_probe,
+ .remove = wf_smu_remove,
+};
+
+
+static int __init wf_smu_init(void)
+{
+ int rc = -ENODEV;
+
+ if (machine_is_compatible("PowerMac9,1"))
+ rc = wf_init_pm();
+
+ if (rc == 0) {
+#ifdef MODULE
+ request_module("windfarm_smu_controls");
+ request_module("windfarm_smu_sensors");
+ request_module("windfarm_lm75_sensor");
+
+#endif /* MODULE */
+ driver_register(&wf_smu_driver);
+ }
+
+ return rc;
+}
+
+static void __exit wf_smu_exit(void)
+{
+
+ driver_unregister(&wf_smu_driver);
+}
+
+
+module_init(wf_smu_init);
+module_exit(wf_smu_exit);
+
+MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
+MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
+MODULE_LICENSE("GPL");
+
--- /dev/null
+/*
+ * Windfarm PowerMac thermal control. SMU based controls
+ *
+ * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ *
+ * Released under the term of the GNU GPL v2.
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/init.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/smu.h>
+
+#include "windfarm.h"
+
+#define VERSION "0.3"
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(args...) printk(args)
+#else
+#define DBG(args...) do { } while(0)
+#endif
+
+/*
+ * SMU fans control object
+ */
+
+static LIST_HEAD(smu_fans);
+
+struct smu_fan_control {
+ struct list_head link;
+ int fan_type; /* 0 = rpm, 1 = pwm */
+ u32 reg; /* index in SMU */
+ s32 value; /* current value */
+ s32 min, max; /* min/max values */
+ struct wf_control ctrl;
+};
+#define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl)
+
+static int smu_set_fan(int pwm, u8 id, u16 value)
+{
+ struct smu_cmd cmd;
+ u8 buffer[16];
+ DECLARE_COMPLETION(comp);
+ int rc;
+
+ /* Fill SMU command structure */
+ cmd.cmd = SMU_CMD_FAN_COMMAND;
+ cmd.data_len = 14;
+ cmd.reply_len = 16;
+ cmd.data_buf = cmd.reply_buf = buffer;
+ cmd.status = 0;
+ cmd.done = smu_done_complete;
+ cmd.misc = ∁
+
+ /* Fill argument buffer */
+ memset(buffer, 0, 16);
+ buffer[0] = pwm ? 0x10 : 0x00;
+ buffer[1] = 0x01 << id;
+ *((u16 *)&buffer[2 + id * 2]) = value;
+
+ rc = smu_queue_cmd(&cmd);
+ if (rc)
+ return rc;
+ wait_for_completion(&comp);
+ return cmd.status;
+}
+
+static void smu_fan_release(struct wf_control *ct)
+{
+ struct smu_fan_control *fct = to_smu_fan(ct);
+
+ kfree(fct);
+}
+
+static int smu_fan_set(struct wf_control *ct, s32 value)
+{
+ struct smu_fan_control *fct = to_smu_fan(ct);
+
+ if (value < fct->min)
+ value = fct->min;
+ if (value > fct->max)
+ value = fct->max;
+ fct->value = value;
+
+ return smu_set_fan(fct->fan_type, fct->reg, value);
+}
+
+static int smu_fan_get(struct wf_control *ct, s32 *value)
+{
+ struct smu_fan_control *fct = to_smu_fan(ct);
+ *value = fct->value; /* todo: read from SMU */
+ return 0;
+}
+
+static s32 smu_fan_min(struct wf_control *ct)
+{
+ struct smu_fan_control *fct = to_smu_fan(ct);
+ return fct->min;
+}
+
+static s32 smu_fan_max(struct wf_control *ct)
+{
+ struct smu_fan_control *fct = to_smu_fan(ct);
+ return fct->max;
+}
+
+static struct wf_control_ops smu_fan_ops = {
+ .set_value = smu_fan_set,
+ .get_value = smu_fan_get,
+ .get_min = smu_fan_min,
+ .get_max = smu_fan_max,
+ .release = smu_fan_release,
+ .owner = THIS_MODULE,
+};
+
+static struct smu_fan_control *smu_fan_create(struct device_node *node,
+ int pwm_fan)
+{
+ struct smu_fan_control *fct;
+ s32 *v; u32 *reg;
+ char *l;
+
+ fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
+ if (fct == NULL)
+ return NULL;
+ fct->ctrl.ops = &smu_fan_ops;
+ l = (char *)get_property(node, "location", NULL);
+ if (l == NULL)
+ goto fail;
+
+ fct->fan_type = pwm_fan;
+ fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;
+
+ /* We use the name & location here the same way we do for SMU sensors,
+ * see the comment in windfarm_smu_sensors.c. The locations are a bit
+ * less consistent here between the iMac and the desktop models, but
+ * that is good enough for our needs for now at least.
+ *
+ * One problem though is that Apple seem to be inconsistent with case
+ * and the kernel doesn't have strcasecmp =P
+ */
+
+ fct->ctrl.name = NULL;
+
+ /* Names used on desktop models */
+ if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") ||
+ !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan"))
+ fct->ctrl.name = "cpu-rear-fan-0";
+ else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1"))
+ fct->ctrl.name = "cpu-rear-fan-1";
+ else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") ||
+ !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan"))
+ fct->ctrl.name = "cpu-front-fan-0";
+ else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1"))
+ fct->ctrl.name = "cpu-front-fan-1";
+ else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan"))
+ fct->ctrl.name = "slots-fan";
+ else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay"))
+ fct->ctrl.name = "drive-bay-fan";
+
+ /* Names used on iMac models */
+ if (!strcmp(l, "System Fan") || !strcmp(l, "System fan"))
+ fct->ctrl.name = "system-fan";
+ else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan"))
+ fct->ctrl.name = "cpu-fan";
+ else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive"))
+ fct->ctrl.name = "drive-bay-fan";
+
+ /* Unrecognized fan, bail out */
+ if (fct->ctrl.name == NULL)
+ goto fail;
+
+ /* Get min & max values*/
+ v = (s32 *)get_property(node, "min-value", NULL);
+ if (v == NULL)
+ goto fail;
+ fct->min = *v;
+ v = (s32 *)get_property(node, "max-value", NULL);
+ if (v == NULL)
+ goto fail;
+ fct->max = *v;
+
+ /* Get "reg" value */
+ reg = (u32 *)get_property(node, "reg", NULL);
+ if (reg == NULL)
+ goto fail;
+ fct->reg = *reg;
+
+ if (wf_register_control(&fct->ctrl))
+ goto fail;
+
+ return fct;
+ fail:
+ kfree(fct);
+ return NULL;
+}
+
+
+static int __init smu_controls_init(void)
+{
+ struct device_node *smu, *fans, *fan;
+
+ if (!smu_present())
+ return -ENODEV;
+
+ smu = of_find_node_by_type(NULL, "smu");
+ if (smu == NULL)
+ return -ENODEV;
+
+ /* Look for RPM fans */
+ for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
+ if (!strcmp(fans->name, "rpm-fans"))
+ break;
+ for (fan = NULL;
+ fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
+ struct smu_fan_control *fct;
+
+ fct = smu_fan_create(fan, 0);
+ if (fct == NULL) {
+ printk(KERN_WARNING "windfarm: Failed to create SMU "
+ "RPM fan %s\n", fan->name);
+ continue;
+ }
+ list_add(&fct->link, &smu_fans);
+ }
+ of_node_put(fans);
+
+
+ /* Look for PWM fans */
+ for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
+ if (!strcmp(fans->name, "pwm-fans"))
+ break;
+ for (fan = NULL;
+ fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
+ struct smu_fan_control *fct;
+
+ fct = smu_fan_create(fan, 1);
+ if (fct == NULL) {
+ printk(KERN_WARNING "windfarm: Failed to create SMU "
+ "PWM fan %s\n", fan->name);
+ continue;
+ }
+ list_add(&fct->link, &smu_fans);
+ }
+ of_node_put(fans);
+ of_node_put(smu);
+
+ return 0;
+}
+
+static void __exit smu_controls_exit(void)
+{
+ struct smu_fan_control *fct;
+
+ while (!list_empty(&smu_fans)) {
+ fct = list_entry(smu_fans.next, struct smu_fan_control, link);
+ list_del(&fct->link);
+ wf_unregister_control(&fct->ctrl);
+ }
+}
+
+
+module_init(smu_controls_init);
+module_exit(smu_controls_exit);
+
+MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
+MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
+MODULE_LICENSE("GPL");
+
--- /dev/null
+/*
+ * Windfarm PowerMac thermal control. SMU based sensors
+ *
+ * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ *
+ * Released under the term of the GNU GPL v2.
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/init.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/smu.h>
+
+#include "windfarm.h"
+
+#define VERSION "0.2"
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(args...) printk(args)
+#else
+#define DBG(args...) do { } while(0)
+#endif
+
+/*
+ * Various SMU "partitions" calibration objects for which we
+ * keep pointers here for use by bits & pieces of the driver
+ */
+static struct smu_sdbp_cpuvcp *cpuvcp;
+static int cpuvcp_version;
+static struct smu_sdbp_cpudiode *cpudiode;
+static struct smu_sdbp_slotspow *slotspow;
+static u8 *debugswitches;
+
+/*
+ * SMU basic sensors objects
+ */
+
+static LIST_HEAD(smu_ads);
+
+struct smu_ad_sensor {
+ struct list_head link;
+ u32 reg; /* index in SMU */
+ struct wf_sensor sens;
+};
+#define to_smu_ads(c) container_of(c, struct smu_ad_sensor, sens)
+
+static void smu_ads_release(struct wf_sensor *sr)
+{
+ struct smu_ad_sensor *ads = to_smu_ads(sr);
+
+ kfree(ads);
+}
+
+static int smu_read_adc(u8 id, s32 *value)
+{
+ struct smu_simple_cmd cmd;
+ DECLARE_COMPLETION(comp);
+ int rc;
+
+ rc = smu_queue_simple(&cmd, SMU_CMD_READ_ADC, 1,
+ smu_done_complete, &comp, id);
+ if (rc)
+ return rc;
+ wait_for_completion(&comp);
+ if (cmd.cmd.status != 0)
+ return cmd.cmd.status;
+ if (cmd.cmd.reply_len != 2) {
+ printk(KERN_ERR "winfarm: read ADC 0x%x returned %d bytes !\n",
+ id, cmd.cmd.reply_len);
+ return -EIO;
+ }
+ *value = *((u16 *)cmd.buffer);
+ return 0;
+}
+
+static int smu_cputemp_get(struct wf_sensor *sr, s32 *value)
+{
+ struct smu_ad_sensor *ads = to_smu_ads(sr);
+ int rc;
+ s32 val;
+ s64 scaled;
+
+ rc = smu_read_adc(ads->reg, &val);
+ if (rc) {
+ printk(KERN_ERR "windfarm: read CPU temp failed, err %d\n",
+ rc);
+ return rc;
+ }
+
+ /* Ok, we have to scale & adjust, taking units into account */
+ scaled = (s64)(((u64)val) * (u64)cpudiode->m_value);
+ scaled >>= 3;
+ scaled += ((s64)cpudiode->b_value) << 9;
+ *value = (s32)(scaled << 1);
+
+ return 0;
+}
+
+static int smu_cpuamp_get(struct wf_sensor *sr, s32 *value)
+{
+ struct smu_ad_sensor *ads = to_smu_ads(sr);
+ s32 val, scaled;
+ int rc;
+
+ rc = smu_read_adc(ads->reg, &val);
+ if (rc) {
+ printk(KERN_ERR "windfarm: read CPU current failed, err %d\n",
+ rc);
+ return rc;
+ }
+
+ /* Ok, we have to scale & adjust, taking units into account */
+ scaled = (s32)(val * (u32)cpuvcp->curr_scale);
+ scaled += (s32)cpuvcp->curr_offset;
+ *value = scaled << 4;
+
+ return 0;
+}
+
+static int smu_cpuvolt_get(struct wf_sensor *sr, s32 *value)
+{
+ struct smu_ad_sensor *ads = to_smu_ads(sr);
+ s32 val, scaled;
+ int rc;
+
+ rc = smu_read_adc(ads->reg, &val);
+ if (rc) {
+ printk(KERN_ERR "windfarm: read CPU voltage failed, err %d\n",
+ rc);
+ return rc;
+ }
+
+ /* Ok, we have to scale & adjust, taking units into account */
+ scaled = (s32)(val * (u32)cpuvcp->volt_scale);
+ scaled += (s32)cpuvcp->volt_offset;
+ *value = scaled << 4;
+
+ return 0;
+}
+
+static int smu_slotspow_get(struct wf_sensor *sr, s32 *value)
+{
+ struct smu_ad_sensor *ads = to_smu_ads(sr);
+ s32 val, scaled;
+ int rc;
+
+ rc = smu_read_adc(ads->reg, &val);
+ if (rc) {
+ printk(KERN_ERR "windfarm: read slots power failed, err %d\n",
+ rc);
+ return rc;
+ }
+
+ /* Ok, we have to scale & adjust, taking units into account */
+ scaled = (s32)(val * (u32)slotspow->pow_scale);
+ scaled += (s32)slotspow->pow_offset;
+ *value = scaled << 4;
+
+ return 0;
+}
+
+
+static struct wf_sensor_ops smu_cputemp_ops = {
+ .get_value = smu_cputemp_get,
+ .release = smu_ads_release,
+ .owner = THIS_MODULE,
+};
+static struct wf_sensor_ops smu_cpuamp_ops = {
+ .get_value = smu_cpuamp_get,
+ .release = smu_ads_release,
+ .owner = THIS_MODULE,
+};
+static struct wf_sensor_ops smu_cpuvolt_ops = {
+ .get_value = smu_cpuvolt_get,
+ .release = smu_ads_release,
+ .owner = THIS_MODULE,
+};
+static struct wf_sensor_ops smu_slotspow_ops = {
+ .get_value = smu_slotspow_get,
+ .release = smu_ads_release,
+ .owner = THIS_MODULE,
+};
+
+
+static struct smu_ad_sensor *smu_ads_create(struct device_node *node)
+{
+ struct smu_ad_sensor *ads;
+ char *c, *l;
+ u32 *v;
+
+ ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL);
+ if (ads == NULL)
+ return NULL;
+ c = (char *)get_property(node, "device_type", NULL);
+ l = (char *)get_property(node, "location", NULL);
+ if (c == NULL || l == NULL)
+ goto fail;
+
+ /* We currently pick the sensors based on the OF name and location
+ * properties, while Darwin uses the sensor-id's.
+ * The problem with the IDs is that they are model specific while it
+ * looks like apple has been doing a reasonably good job at keeping
+ * the names and locations consistents so I'll stick with the names
+ * and locations for now.
+ */
+ if (!strcmp(c, "temp-sensor") &&
+ !strcmp(l, "CPU T-Diode")) {
+ ads->sens.ops = &smu_cputemp_ops;
+ ads->sens.name = "cpu-temp";
+ } else if (!strcmp(c, "current-sensor") &&
+ !strcmp(l, "CPU Current")) {
+ ads->sens.ops = &smu_cpuamp_ops;
+ ads->sens.name = "cpu-current";
+ } else if (!strcmp(c, "voltage-sensor") &&
+ !strcmp(l, "CPU Voltage")) {
+ ads->sens.ops = &smu_cpuvolt_ops;
+ ads->sens.name = "cpu-voltage";
+ } else if (!strcmp(c, "power-sensor") &&
+ !strcmp(l, "Slots Power")) {
+ ads->sens.ops = &smu_slotspow_ops;
+ ads->sens.name = "slots-power";
+ if (slotspow == NULL) {
+ DBG("wf: slotspow partition (%02x) not found\n",
+ SMU_SDB_SLOTSPOW_ID);
+ goto fail;
+ }
+ } else
+ goto fail;
+
+ v = (u32 *)get_property(node, "reg", NULL);
+ if (v == NULL)
+ goto fail;
+ ads->reg = *v;
+
+ if (wf_register_sensor(&ads->sens))
+ goto fail;
+ return ads;
+ fail:
+ kfree(ads);
+ return NULL;
+}
+
+/*
+ * SMU Power combo sensor object
+ */
+
+struct smu_cpu_power_sensor {
+ struct list_head link;
+ struct wf_sensor *volts;
+ struct wf_sensor *amps;
+ int fake_volts : 1;
+ int quadratic : 1;
+ struct wf_sensor sens;
+};
+#define to_smu_cpu_power(c) container_of(c, struct smu_cpu_power_sensor, sens)
+
+static struct smu_cpu_power_sensor *smu_cpu_power;
+
+static void smu_cpu_power_release(struct wf_sensor *sr)
+{
+ struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
+
+ if (pow->volts)
+ wf_put_sensor(pow->volts);
+ if (pow->amps)
+ wf_put_sensor(pow->amps);
+ kfree(pow);
+}
+
+static int smu_cpu_power_get(struct wf_sensor *sr, s32 *value)
+{
+ struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
+ s32 volts, amps, power;
+ u64 tmps, tmpa, tmpb;
+ int rc;
+
+ rc = pow->amps->ops->get_value(pow->amps, &s);
+ if (rc)
+ return rc;
+
+ if (pow->fake_volts) {
+ *value = amps * 12 - 0x30000;
+ return 0;
+ }
+
+ rc = pow->volts->ops->get_value(pow->volts, &volts);
+ if (rc)
+ return rc;
+
+ power = (s32)((((u64)volts) * ((u64)amps)) >> 16);
+ if (!pow->quadratic) {
+ *value = power;
+ return 0;
+ }
+ tmps = (((u64)power) * ((u64)power)) >> 16;
+ tmpa = ((u64)cpuvcp->power_quads[0]) * tmps;
+ tmpb = ((u64)cpuvcp->power_quads[1]) * ((u64)power);
+ *value = (tmpa >> 28) + (tmpb >> 28) + (cpuvcp->power_quads[2] >> 12);
+
+ return 0;
+}
+
+static struct wf_sensor_ops smu_cpu_power_ops = {
+ .get_value = smu_cpu_power_get,
+ .release = smu_cpu_power_release,
+ .owner = THIS_MODULE,
+};
+
+
+static struct smu_cpu_power_sensor *
+smu_cpu_power_create(struct wf_sensor *volts, struct wf_sensor *amps)
+{
+ struct smu_cpu_power_sensor *pow;
+
+ pow = kmalloc(sizeof(struct smu_cpu_power_sensor), GFP_KERNEL);
+ if (pow == NULL)
+ return NULL;
+ pow->sens.ops = &smu_cpu_power_ops;
+ pow->sens.name = "cpu-power";
+
+ wf_get_sensor(volts);
+ pow->volts = volts;
+ wf_get_sensor(amps);
+ pow->amps = amps;
+
+ /* Some early machines need a faked voltage */
+ if (debugswitches && ((*debugswitches) & 0x80)) {
+ printk(KERN_INFO "windfarm: CPU Power sensor using faked"
+ " voltage !\n");
+ pow->fake_volts = 1;
+ } else
+ pow->fake_volts = 0;
+
+ /* Try to use quadratic transforms on PowerMac8,1 and 9,1 for now,
+ * I yet have to figure out what's up with 8,2 and will have to
+ * adjust for later, unless we can 100% trust the SDB partition...
+ */
+ if ((machine_is_compatible("PowerMac8,1") ||
+ machine_is_compatible("PowerMac8,2") ||
+ machine_is_compatible("PowerMac9,1")) &&
+ cpuvcp_version >= 2) {
+ pow->quadratic = 1;
+ DBG("windfarm: CPU Power using quadratic transform\n");
+ } else
+ pow->quadratic = 0;
+
+ if (wf_register_sensor(&pow->sens))
+ goto fail;
+ return pow;
+ fail:
+ kfree(pow);
+ return NULL;
+}
+
+static int smu_fetch_param_partitions(void)
+{
+ struct smu_sdbp_header *hdr;
+
+ /* Get CPU voltage/current/power calibration data */
+ hdr = smu_get_sdb_partition(SMU_SDB_CPUVCP_ID, NULL);
+ if (hdr == NULL) {
+ DBG("wf: cpuvcp partition (%02x) not found\n",
+ SMU_SDB_CPUVCP_ID);
+ return -ENODEV;
+ }
+ cpuvcp = (struct smu_sdbp_cpuvcp *)&hdr[1];
+ /* Keep version around */
+ cpuvcp_version = hdr->version;
+
+ /* Get CPU diode calibration data */
+ hdr = smu_get_sdb_partition(SMU_SDB_CPUDIODE_ID, NULL);
+ if (hdr == NULL) {
+ DBG("wf: cpudiode partition (%02x) not found\n",
+ SMU_SDB_CPUDIODE_ID);
+ return -ENODEV;
+ }
+ cpudiode = (struct smu_sdbp_cpudiode *)&hdr[1];
+
+ /* Get slots power calibration data if any */
+ hdr = smu_get_sdb_partition(SMU_SDB_SLOTSPOW_ID, NULL);
+ if (hdr != NULL)
+ slotspow = (struct smu_sdbp_slotspow *)&hdr[1];
+
+ /* Get debug switches if any */
+ hdr = smu_get_sdb_partition(SMU_SDB_DEBUG_SWITCHES_ID, NULL);
+ if (hdr != NULL)
+ debugswitches = (u8 *)&hdr[1];
+
+ return 0;
+}
+
+static int __init smu_sensors_init(void)
+{
+ struct device_node *smu, *sensors, *s;
+ struct smu_ad_sensor *volt_sensor = NULL, *curr_sensor = NULL;
+ int rc;
+
+ if (!smu_present())
+ return -ENODEV;
+
+ /* Get parameters partitions */
+ rc = smu_fetch_param_partitions();
+ if (rc)
+ return rc;
+
+ smu = of_find_node_by_type(NULL, "smu");
+ if (smu == NULL)
+ return -ENODEV;
+
+ /* Look for sensors subdir */
+ for (sensors = NULL;
+ (sensors = of_get_next_child(smu, sensors)) != NULL;)
+ if (!strcmp(sensors->name, "sensors"))
+ break;
+
+ of_node_put(smu);
+
+ /* Create basic sensors */
+ for (s = NULL;
+ sensors && (s = of_get_next_child(sensors, s)) != NULL;) {
+ struct smu_ad_sensor *ads;
+
+ ads = smu_ads_create(s);
+ if (ads == NULL)
+ continue;
+ list_add(&ads->link, &smu_ads);
+ /* keep track of cpu voltage & current */
+ if (!strcmp(ads->sens.name, "cpu-voltage"))
+ volt_sensor = ads;
+ else if (!strcmp(ads->sens.name, "cpu-current"))
+ curr_sensor = ads;
+ }
+
+ of_node_put(sensors);
+
+ /* Create CPU power sensor if possible */
+ if (volt_sensor && curr_sensor)
+ smu_cpu_power = smu_cpu_power_create(&volt_sensor->sens,
+ &curr_sensor->sens);
+
+ return 0;
+}
+
+static void __exit smu_sensors_exit(void)
+{
+ struct smu_ad_sensor *ads;
+
+ /* dispose of power sensor */
+ if (smu_cpu_power)
+ wf_unregister_sensor(&smu_cpu_power->sens);
+
+ /* dispose of basic sensors */
+ while (!list_empty(&smu_ads)) {
+ ads = list_entry(smu_ads.next, struct smu_ad_sensor, link);
+ list_del(&ads->link);
+ wf_unregister_sensor(&ads->sens);
+ }
+}
+
+
+module_init(smu_sensors_init);
+module_exit(smu_sensors_exit);
+
+MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
+MODULE_DESCRIPTION("SMU sensor objects for PowerMacs thermal control");
+MODULE_LICENSE("GPL");
+
projects / linux-2.6 / commitdiff