#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 <linux/mutex.h>
+#include <linux/freezer.h>
+
+#include <asm/prom.h>
#include "windfarm.h"
static LIST_HEAD(wf_controls);
static LIST_HEAD(wf_sensors);
static DEFINE_MUTEX(wf_lock);
-static struct notifier_block *wf_client_list;
+static BLOCKING_NOTIFIER_HEAD(wf_client_list);
static int wf_client_count;
static unsigned int wf_overtemp;
static unsigned int wf_overtemp_counter;
struct task_struct *wf_thread;
+static struct platform_device wf_platform_device = {
+ .name = "windfarm",
+};
+
/*
* Utilities & tick thread
*/
static inline void wf_notify(int event, void *param)
{
- notifier_call_chain(&wf_client_list, event, param);
+ blocking_notifier_call_chain(&wf_client_list, event, param);
}
int wf_critical_overtemp(void)
"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
NULL };
- return call_usermodehelper(critical_overtemp_path, argv, envp, 0);
+ return call_usermodehelper(critical_overtemp_path,
+ argv, envp, UMH_WAIT_EXEC);
}
EXPORT_SYMBOL_GPL(wf_critical_overtemp);
DBG("wf: thread started\n");
- while(!kthread_should_stop()) {
+ set_freezable();
+ while (!kthread_should_stop()) {
try_to_freeze();
if (time_after_eq(jiffies, next)) {
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");
kfree(ct);
}
+static ssize_t wf_show_control(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct wf_control *ctrl = container_of(attr, struct wf_control, attr);
+ s32 val = 0;
+ int err;
+
+ err = ctrl->ops->get_value(ctrl, &val);
+ if (err < 0)
+ return err;
+ return sprintf(buf, "%d\n", val);
+}
+
+/* This is really only for debugging... */
+static ssize_t wf_store_control(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct wf_control *ctrl = container_of(attr, struct wf_control, attr);
+ int val;
+ int err;
+ char *endp;
+
+ val = simple_strtoul(buf, &endp, 0);
+ while (endp < buf + count && (*endp == ' ' || *endp == '\n'))
+ ++endp;
+ if (endp - buf < count)
+ return -EINVAL;
+ err = ctrl->ops->set_value(ctrl, val);
+ if (err < 0)
+ return err;
+ return count;
+}
+
int wf_register_control(struct wf_control *new_ct)
{
struct wf_control *ct;
kref_init(&new_ct->ref);
list_add(&new_ct->link, &wf_controls);
+ new_ct->attr.attr.name = new_ct->name;
+ new_ct->attr.attr.mode = 0644;
+ new_ct->attr.show = wf_show_control;
+ new_ct->attr.store = wf_store_control;
+ if (device_create_file(&wf_platform_device.dev, &new_ct->attr))
+ printk(KERN_WARNING "windfarm: device_create_file failed"
+ " for %s\n", new_ct->name);
+ /* the subsystem still does useful work without the file */
+
DBG("wf: Registered control %s\n", new_ct->name);
wf_notify(WF_EVENT_NEW_CONTROL, new_ct);
kfree(sr);
}
+static ssize_t wf_show_sensor(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct wf_sensor *sens = container_of(attr, struct wf_sensor, attr);
+ s32 val = 0;
+ int err;
+
+ err = sens->ops->get_value(sens, &val);
+ if (err < 0)
+ return err;
+ return sprintf(buf, "%d.%03d\n", FIX32TOPRINT(val));
+}
+
int wf_register_sensor(struct wf_sensor *new_sr)
{
struct wf_sensor *sr;
kref_init(&new_sr->ref);
list_add(&new_sr->link, &wf_sensors);
+ new_sr->attr.attr.name = new_sr->name;
+ new_sr->attr.attr.mode = 0444;
+ new_sr->attr.show = wf_show_sensor;
+ new_sr->attr.store = NULL;
+ if (device_create_file(&wf_platform_device.dev, &new_sr->attr))
+ printk(KERN_WARNING "windfarm: device_create_file failed"
+ " for %s\n", new_sr->name);
+ /* the subsystem still does useful work without the file */
+
DBG("wf: Registered sensor %s\n", new_sr->name);
wf_notify(WF_EVENT_NEW_SENSOR, new_sr);
struct wf_sensor *sr;
mutex_lock(&wf_lock);
- rc = notifier_chain_register(&wf_client_list, nb);
+ rc = blocking_notifier_chain_register(&wf_client_list, nb);
if (rc != 0)
goto bail;
wf_client_count++;
int wf_unregister_client(struct notifier_block *nb)
{
mutex_lock(&wf_lock);
- notifier_chain_unregister(&wf_client_list, nb);
+ blocking_notifier_chain_unregister(&wf_client_list, nb);
wf_client_count++;
if (wf_client_count == 0)
wf_stop_thread();
}
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");
+ /* Don't register on old machines that use therm_pm72 for now */
+ if (machine_is_compatible("PowerMac7,2") ||
+ machine_is_compatible("PowerMac7,3") ||
+ machine_is_compatible("RackMac3,1"))
+ return -ENODEV;
platform_device_register(&wf_platform_device);
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff