Release 4.14 drivers/macintosh/windfarm_core.c

Directory: drivers/macintosh
/*
 * 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/slab.h>
#include <linux/init.h>
#include <linux/spinlock.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"


#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 DEFINE_MUTEX(wf_lock);
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)
{
	blocking_notifier_call_chain(&wf_client_list, event, param);
}

Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 23 95.83% 1 50.00%
Alan Stern 1 4.17% 1 50.00%
Total 24 100.00% 2 100.00%



static int wf_critical_overtemp(void)
{
	static char const critical_overtemp_path[] = "/sbin/critical_overtemp";
	char *argv[] = { (char *)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, UMH_WAIT_EXEC);
}

Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 51 86.44% 1 25.00%
Greg Kroah-Hartman 6 10.17% 1 25.00%
Jeremy Fitzhardinge 1 1.69% 1 25.00%
Paul Bolle 1 1.69% 1 25.00%
Total 59 100.00% 4 100.00%



static int wf_thread_func(void *data)
{
	unsigned long next, delay;

	next = jiffies;

	DBG("wf: thread started\n");

	set_freezable();
	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);
	}

	DBG("wf: thread stopped\n");

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 119 95.20% 1 33.33%
Rafael J. Wysocki 3 2.40% 1 33.33%
Johannes Berg 3 2.40% 1 33.33%
Total 125 100.00% 3 100.00%



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;
	}
}


Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 43 100.00% 1 100.00%
Total 43 100.00% 1 100.00%



static void wf_stop_thread(void)
{
	if (wf_thread)
		kthread_stop(wf_thread);
	wf_thread = NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 21 100.00% 1 100.00%
Total 21 100.00% 1 100.00%

/*
 * 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);
}

Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 62 100.00% 1 100.00%
Total 62 100.00% 1 100.00%



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);
	const char *typestr;
	s32 val = 0;
	int err;

	err = ctrl->ops->get_value(ctrl, &val);
	if (err < 0) {
		if (err == -EFAULT)
			return sprintf(buf, "<HW FAULT>\n");
		return err;
	}
	switch(ctrl->type) {
	case WF_CONTROL_RPM_FAN:
		typestr = " RPM";
		break;
	case WF_CONTROL_PWM_FAN:
		typestr = " %";
		break;
	default:
		typestr = "";
	}
	return sprintf(buf, "%d%s\n", val, typestr);
}

Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 129 100.00% 3 100.00%
Total 129 100.00% 3 100.00%

/* 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;
}

Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 121 100.00% 1 100.00%
Total 121 100.00% 1 100.00%



int wf_register_control(struct wf_control *new_ct)
{
	struct wf_control *ct;

	mutex_lock(&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);
			mutex_unlock(&wf_lock);
			return -EEXIST;
		}
	}
	kref_init(&new_ct->ref);
	list_add(&new_ct->link, &wf_controls);

	sysfs_attr_init(&new_ct->attr.attr);
	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);
	mutex_unlock(&wf_lock);

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 160 85.56% 2 40.00%
Stephen Rothwell 14 7.49% 1 20.00%
Wolfram Sang 10 5.35% 1 20.00%
Ingo Molnar 3 1.60% 1 20.00%
Total 187 100.00% 5 100.00%


EXPORT_SYMBOL_GPL(wf_register_control);



void wf_unregister_control(struct wf_control *ct)
{
	mutex_lock(&wf_lock);
	list_del(&ct->link);
	mutex_unlock(&wf_lock);

	DBG("wf: Unregistered control %s\n", ct->name);

	kref_put(&ct->ref, wf_control_release);
}
Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 47 95.92% 1 50.00%
Ingo Molnar 2 4.08% 1 50.00%
Total 49 100.00% 2 100.00%


EXPORT_SYMBOL_GPL(wf_unregister_control);



int wf_get_control(struct wf_control *ct)
{
	if (!try_module_get(ct->ops->owner))
		return -ENODEV;
	kref_get(&ct->ref);
	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%


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);
}
Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 36 100.00% 1 100.00%
Total 36 100.00% 1 100.00%


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);
}

Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 62 100.00% 1 100.00%
Total 62 100.00% 1 100.00%



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));
}

Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 79 100.00% 1 100.00%
Total 79 100.00% 1 100.00%



int wf_register_sensor(struct wf_sensor *new_sr)
{
	struct wf_sensor *sr;

	mutex_lock(&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);
			mutex_unlock(&wf_lock);
			return -EEXIST;
		}
	}
	kref_init(&new_sr->ref);
	list_add(&new_sr->link, &wf_sensors);

	sysfs_attr_init(&new_sr->attr.attr);
	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);
	mutex_unlock(&wf_lock);

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 160 85.56% 2 40.00%
Stephen Rothwell 14 7.49% 1 20.00%
Johannes Berg 10 5.35% 1 20.00%
Ingo Molnar 3 1.60% 1 20.00%
Total 187 100.00% 5 100.00%


EXPORT_SYMBOL_GPL(wf_register_sensor);



void wf_unregister_sensor(struct wf_sensor *sr)
{
	mutex_lock(&wf_lock);
	list_del(&sr->link);
	mutex_unlock(&wf_lock);

	DBG("wf: Unregistered sensor %s\n", sr->name);

	wf_put_sensor(sr);
}
Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 42 95.45% 1 50.00%
Ingo Molnar 2 4.55% 1 50.00%
Total 44 100.00% 2 100.00%


EXPORT_SYMBOL_GPL(wf_unregister_sensor);



int wf_get_sensor(struct wf_sensor *sr)
{
	if (!try_module_get(sr->ops->owner))
		return -ENODEV;
	kref_get(&sr->ref);
	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%


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);
}
Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 36 100.00% 1 100.00%
Total 36 100.00% 1 100.00%


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;

	mutex_lock(&wf_lock);
	rc = blocking_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:
	mutex_unlock(&wf_lock);
	return rc;
}
Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 98 97.03% 1 33.33%
Ingo Molnar 2 1.98% 1 33.33%
Alan Stern 1 0.99% 1 33.33%
Total 101 100.00% 3 100.00%


EXPORT_SYMBOL_GPL(wf_register_client);



int wf_unregister_client(struct notifier_block *nb)
{
	mutex_lock(&wf_lock);
	blocking_notifier_chain_unregister(&wf_client_list, nb);
	wf_client_count--;
	if (wf_client_count == 0)
		wf_stop_thread();
	mutex_unlock(&wf_lock);

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 41 91.11% 1 25.00%
Ingo Molnar 2 4.44% 1 25.00%
Alan Stern 1 2.22% 1 25.00%
Paul Bolle 1 2.22% 1 25.00%
Total 45 100.00% 4 100.00%


EXPORT_SYMBOL_GPL(wf_unregister_client);



void wf_set_overtemp(void)
{
	mutex_lock(&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);
	}
	mutex_unlock(&wf_lock);
}
Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 45 95.74% 1 50.00%
Ingo Molnar 2 4.26% 1 50.00%
Total 47 100.00% 2 100.00%


EXPORT_SYMBOL_GPL(wf_set_overtemp);



void wf_clear_overtemp(void)
{
	mutex_lock(&wf_lock);
	WARN_ON(wf_overtemp == 0);
	if (wf_overtemp == 0) {
		mutex_unlock(&wf_lock);
		return;
	}
	wf_overtemp--;
	if (wf_overtemp == 0) {
		printk(KERN_WARNING "windfarm: Overtemp condition cleared !\n");
		wf_notify(WF_EVENT_NORMALTEMP, NULL);
	}
	mutex_unlock(&wf_lock);
}
Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 62 95.38% 1 50.00%
Ingo Molnar 3 4.62% 1 50.00%
Total 65 100.00% 2 100.00%


EXPORT_SYMBOL_GPL(wf_clear_overtemp);



static int __init windfarm_core_init(void)
{
	DBG("wf: core loaded\n");

	platform_device_register(&wf_platform_device);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 23 100.00% 1 100.00%
Total 23 100.00% 1 100.00%



static void __exit windfarm_core_exit(void)
{
	BUG_ON(wf_client_count != 0);

	DBG("wf: core unloaded\n");

	platform_device_unregister(&wf_platform_device);
}


Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%


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");

Overall Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 1768 94.70% 5 27.78%
Stephen Rothwell 28 1.50% 1 5.56%
Ingo Molnar 23 1.23% 1 5.56%
Johannes Berg 13 0.70% 2 11.11%
Wolfram Sang 10 0.54% 1 5.56%
Alan Stern 7 0.37% 1 5.56%
Greg Kroah-Hartman 6 0.32% 1 5.56%
Tejun Heo 3 0.16% 1 5.56%
Rafael J. Wysocki 3 0.16% 1 5.56%
Nigel Cunningham 3 0.16% 1 5.56%
Paul Bolle 2 0.11% 2 11.11%
Jeremy Fitzhardinge 1 0.05% 1 5.56%
Total 1867 100.00% 18 100.00%
Directory: drivers/macintosh

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Benjamin Herrenschmidt	23	95.83%	1	50.00%
Alan Stern	1	4.17%	1	50.00%
Total	24	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.14 drivers/macintosh/windfarm_core.c

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