* 2002-3 Open Source Development Lab
*
* This file is released under the GPLv2
- *
- * This exports a 'system' bus type.
+ *
+ * This exports a 'system' bus type.
* By default, a 'sys' bus gets added to the root of the system. There will
* always be core system devices. Devices can use sysdev_register() to
* add themselves as children of the system bus.
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/string.h>
+#include <linux/pm.h>
+#include <linux/device.h>
+#include <asm/semaphore.h>
+#include "base.h"
extern struct subsystem devices_subsys;
-#define to_sysdev(k) container_of(k,struct sys_device,kobj)
-#define to_sysdev_attr(a) container_of(a,struct sysdev_attribute,attr)
+#define to_sysdev(k) container_of(k, struct sys_device, kobj)
+#define to_sysdev_attr(a) container_of(a, struct sysdev_attribute, attr)
-static ssize_t
+static ssize_t
sysdev_show(struct kobject * kobj, struct attribute * attr, char * buffer)
{
struct sys_device * sysdev = to_sysdev(kobj);
struct sysdev_attribute * sysdev_attr = to_sysdev_attr(attr);
if (sysdev_attr->show)
- return sysdev_attr->show(sysdev,buffer);
- return 0;
+ return sysdev_attr->show(sysdev, buffer);
+ return -EIO;
}
static ssize_t
-sysdev_store(struct kobject * kobj, struct attribute * attr,
+sysdev_store(struct kobject * kobj, struct attribute * attr,
const char * buffer, size_t count)
{
struct sys_device * sysdev = to_sysdev(kobj);
struct sysdev_attribute * sysdev_attr = to_sysdev_attr(attr);
if (sysdev_attr->store)
- return sysdev_attr->store(sysdev,buffer,count);
- return 0;
+ return sysdev_attr->store(sysdev, buffer, count);
+ return -EIO;
}
static struct sysfs_ops sysfs_ops = {
int sysdev_create_file(struct sys_device * s, struct sysdev_attribute * a)
{
- return sysfs_create_file(&s->kobj,&a->attr);
+ return sysfs_create_file(&s->kobj, &a->attr);
}
void sysdev_remove_file(struct sys_device * s, struct sysdev_attribute * a)
{
- sysfs_remove_file(&s->kobj,&a->attr);
+ sysfs_remove_file(&s->kobj, &a->attr);
}
-EXPORT_SYMBOL(sysdev_create_file);
-EXPORT_SYMBOL(sysdev_remove_file);
+EXPORT_SYMBOL_GPL(sysdev_create_file);
+EXPORT_SYMBOL_GPL(sysdev_remove_file);
-/*
- * declare system_subsys
+/*
+ * declare system_subsys
*/
-decl_subsys(system,&ktype_sysdev,NULL);
+static decl_subsys(system, &ktype_sysdev, NULL);
int sysdev_class_register(struct sysdev_class * cls)
{
kobject_name(&cls->kset.kobj));
INIT_LIST_HEAD(&cls->drivers);
cls->kset.subsys = &system_subsys;
- kset_set_kset_s(cls,system_subsys);
+ kset_set_kset_s(cls, system_subsys);
return kset_register(&cls->kset);
}
kset_unregister(&cls->kset);
}
-EXPORT_SYMBOL(sysdev_class_register);
-EXPORT_SYMBOL(sysdev_class_unregister);
+EXPORT_SYMBOL_GPL(sysdev_class_register);
+EXPORT_SYMBOL_GPL(sysdev_class_unregister);
-static LIST_HEAD(global_drivers);
+static LIST_HEAD(sysdev_drivers);
+static DECLARE_MUTEX(sysdev_drivers_lock);
/**
* sysdev_driver_register - Register auxillary driver
* @cls: Device class driver belongs to.
* @drv: Driver.
*
- * If @cls is valid, then @drv is inserted into @cls->drivers to be
+ * If @cls is valid, then @drv is inserted into @cls->drivers to be
* called on each operation on devices of that class. The refcount
- * of @cls is incremented.
- * Otherwise, @drv is inserted into global_drivers, and called for
+ * of @cls is incremented.
+ * Otherwise, @drv is inserted into sysdev_drivers, and called for
* each device.
*/
-int sysdev_driver_register(struct sysdev_class * cls,
+int sysdev_driver_register(struct sysdev_class * cls,
struct sysdev_driver * drv)
{
- down_write(&system_subsys.rwsem);
+ down(&sysdev_drivers_lock);
if (cls && kset_get(&cls->kset)) {
- list_add_tail(&drv->entry,&cls->drivers);
+ list_add_tail(&drv->entry, &cls->drivers);
/* If devices of this class already exist, tell the driver */
if (drv->add) {
drv->add(dev);
}
} else
- list_add_tail(&drv->entry,&global_drivers);
- up_write(&system_subsys.rwsem);
+ list_add_tail(&drv->entry, &sysdev_drivers);
+ up(&sysdev_drivers_lock);
return 0;
}
void sysdev_driver_unregister(struct sysdev_class * cls,
struct sysdev_driver * drv)
{
- down_write(&system_subsys.rwsem);
+ down(&sysdev_drivers_lock);
list_del_init(&drv->entry);
if (cls) {
if (drv->remove) {
}
kset_put(&cls->kset);
}
- up_write(&system_subsys.rwsem);
+ up(&sysdev_drivers_lock);
}
-EXPORT_SYMBOL(sysdev_driver_register);
-EXPORT_SYMBOL(sysdev_driver_unregister);
+EXPORT_SYMBOL_GPL(sysdev_driver_register);
+EXPORT_SYMBOL_GPL(sysdev_driver_unregister);
/* But make sure we point to the right type for sysfs translation */
sysdev->kobj.ktype = &ktype_sysdev;
- error = kobject_set_name(&sysdev->kobj,"%s%d",
- kobject_name(&cls->kset.kobj),sysdev->id);
+ error = kobject_set_name(&sysdev->kobj, "%s%d",
+ kobject_name(&cls->kset.kobj), sysdev->id);
if (error)
return error;
- pr_debug("Registering sys device '%s'\n",kobject_name(&sysdev->kobj));
+ pr_debug("Registering sys device '%s'\n", kobject_name(&sysdev->kobj));
/* Register the object */
error = kobject_register(&sysdev->kobj);
if (!error) {
struct sysdev_driver * drv;
- down_write(&system_subsys.rwsem);
- /* Generic notification is implicit, because it's that
- * code that should have called us.
+ down(&sysdev_drivers_lock);
+ /* Generic notification is implicit, because it's that
+ * code that should have called us.
*/
/* Notify global drivers */
- list_for_each_entry(drv,&global_drivers,entry) {
+ list_for_each_entry(drv, &sysdev_drivers, entry) {
if (drv->add)
drv->add(sysdev);
}
/* Notify class auxillary drivers */
- list_for_each_entry(drv,&cls->drivers,entry) {
+ list_for_each_entry(drv, &cls->drivers, entry) {
if (drv->add)
drv->add(sysdev);
}
- up_write(&system_subsys.rwsem);
+ up(&sysdev_drivers_lock);
}
return error;
}
{
struct sysdev_driver * drv;
- down_write(&system_subsys.rwsem);
- list_for_each_entry(drv,&global_drivers,entry) {
+ down(&sysdev_drivers_lock);
+ list_for_each_entry(drv, &sysdev_drivers, entry) {
if (drv->remove)
drv->remove(sysdev);
}
- list_for_each_entry(drv,&sysdev->cls->drivers,entry) {
+ list_for_each_entry(drv, &sysdev->cls->drivers, entry) {
if (drv->remove)
drv->remove(sysdev);
}
- up_write(&system_subsys.rwsem);
+ up(&sysdev_drivers_lock);
kobject_unregister(&sysdev->kobj);
}
* Loop over each class of system devices, and the devices in each
* of those classes. For each device, we call the shutdown method for
* each driver registered for the device - the globals, the auxillaries,
- * and the class driver.
+ * and the class driver.
*
* Note: The list is iterated in reverse order, so that we shut down
* child devices before we shut down thier parents. The list ordering
* is guaranteed by virtue of the fact that child devices are registered
- * after their parents.
+ * after their parents.
*/
void sysdev_shutdown(void)
pr_debug("Shutting Down System Devices\n");
- down_write(&system_subsys.rwsem);
- list_for_each_entry_reverse(cls,&system_subsys.kset.list,
+ down(&sysdev_drivers_lock);
+ list_for_each_entry_reverse(cls, &system_subsys.kset.list,
kset.kobj.entry) {
struct sys_device * sysdev;
pr_debug("Shutting down type '%s':\n",
kobject_name(&cls->kset.kobj));
- list_for_each_entry(sysdev,&cls->kset.list,kobj.entry) {
+ list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
struct sysdev_driver * drv;
- pr_debug(" %s\n",kobject_name(&sysdev->kobj));
+ pr_debug(" %s\n", kobject_name(&sysdev->kobj));
/* Call global drivers first. */
- list_for_each_entry(drv,&global_drivers,entry) {
+ list_for_each_entry(drv, &sysdev_drivers, entry) {
if (drv->shutdown)
drv->shutdown(sysdev);
}
/* Call auxillary drivers next. */
- list_for_each_entry(drv,&cls->drivers,entry) {
+ list_for_each_entry(drv, &cls->drivers, entry) {
if (drv->shutdown)
drv->shutdown(sysdev);
}
cls->shutdown(sysdev);
}
}
- up_write(&system_subsys.rwsem);
+ up(&sysdev_drivers_lock);
}
+static void __sysdev_resume(struct sys_device *dev)
+{
+ struct sysdev_class *cls = dev->cls;
+ struct sysdev_driver *drv;
+
+ /* First, call the class-specific one */
+ if (cls->resume)
+ cls->resume(dev);
+
+ /* Call auxillary drivers next. */
+ list_for_each_entry(drv, &cls->drivers, entry) {
+ if (drv->resume)
+ drv->resume(dev);
+ }
+
+ /* Call global drivers. */
+ list_for_each_entry(drv, &sysdev_drivers, entry) {
+ if (drv->resume)
+ drv->resume(dev);
+ }
+}
/**
* sysdev_suspend - Suspend all system devices.
* We perform an almost identical operation as sys_device_shutdown()
* above, though calling ->suspend() instead. Interrupts are disabled
* when this called. Devices are responsible for both saving state and
- * quiescing or powering down the device.
+ * quiescing or powering down the device.
*
* This is only called by the device PM core, so we let them handle
* all synchronization.
*/
-int sysdev_suspend(u32 state)
+int sysdev_suspend(pm_message_t state)
{
struct sysdev_class * cls;
+ struct sys_device *sysdev, *err_dev;
+ struct sysdev_driver *drv, *err_drv;
+ int ret;
pr_debug("Suspending System Devices\n");
- list_for_each_entry_reverse(cls,&system_subsys.kset.list,
+ list_for_each_entry_reverse(cls, &system_subsys.kset.list,
kset.kobj.entry) {
- struct sys_device * sysdev;
pr_debug("Suspending type '%s':\n",
kobject_name(&cls->kset.kobj));
- list_for_each_entry(sysdev,&cls->kset.list,kobj.entry) {
- struct sysdev_driver * drv;
- pr_debug(" %s\n",kobject_name(&sysdev->kobj));
+ list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
+ pr_debug(" %s\n", kobject_name(&sysdev->kobj));
/* Call global drivers first. */
- list_for_each_entry(drv,&global_drivers,entry) {
- if (drv->suspend)
- drv->suspend(sysdev,state);
+ list_for_each_entry(drv, &sysdev_drivers, entry) {
+ if (drv->suspend) {
+ ret = drv->suspend(sysdev, state);
+ if (ret)
+ goto gbl_driver;
+ }
}
/* Call auxillary drivers next. */
- list_for_each_entry(drv,&cls->drivers,entry) {
- if (drv->suspend)
- drv->suspend(sysdev,state);
+ list_for_each_entry(drv, &cls->drivers, entry) {
+ if (drv->suspend) {
+ ret = drv->suspend(sysdev, state);
+ if (ret)
+ goto aux_driver;
+ }
}
/* Now call the generic one */
- if (cls->suspend)
- cls->suspend(sysdev,state);
+ if (cls->suspend) {
+ ret = cls->suspend(sysdev, state);
+ if (ret)
+ goto cls_driver;
+ }
}
}
return 0;
+ /* resume current sysdev */
+cls_driver:
+ drv = NULL;
+ printk(KERN_ERR "Class suspend failed for %s\n",
+ kobject_name(&sysdev->kobj));
+
+aux_driver:
+ if (drv)
+ printk(KERN_ERR "Class driver suspend failed for %s\n",
+ kobject_name(&sysdev->kobj));
+ list_for_each_entry(err_drv, &cls->drivers, entry) {
+ if (err_drv == drv)
+ break;
+ if (err_drv->resume)
+ err_drv->resume(sysdev);
+ }
+ drv = NULL;
+
+gbl_driver:
+ if (drv)
+ printk(KERN_ERR "sysdev driver suspend failed for %s\n",
+ kobject_name(&sysdev->kobj));
+ list_for_each_entry(err_drv, &sysdev_drivers, entry) {
+ if (err_drv == drv)
+ break;
+ if (err_drv->resume)
+ err_drv->resume(sysdev);
+ }
+ /* resume other sysdevs in current class */
+ list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) {
+ if (err_dev == sysdev)
+ break;
+ pr_debug(" %s\n", kobject_name(&err_dev->kobj));
+ __sysdev_resume(err_dev);
+ }
+
+ /* resume other classes */
+ list_for_each_entry_continue(cls, &system_subsys.kset.list,
+ kset.kobj.entry) {
+ list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) {
+ pr_debug(" %s\n", kobject_name(&err_dev->kobj));
+ __sysdev_resume(err_dev);
+ }
+ }
+ return ret;
}
* Similar to sys_device_suspend(), but we iterate the list forwards
* to guarantee that parent devices are resumed before their children.
*
- * Note: Interrupts are disabled when called.
+ * Note: Interrupts are disabled when called.
*/
int sysdev_resume(void)
pr_debug("Resuming System Devices\n");
- list_for_each_entry(cls,&system_subsys.kset.list,kset.kobj.entry) {
+ list_for_each_entry(cls, &system_subsys.kset.list, kset.kobj.entry) {
struct sys_device * sysdev;
pr_debug("Resuming type '%s':\n",
kobject_name(&cls->kset.kobj));
- list_for_each_entry(sysdev,&cls->kset.list,kobj.entry) {
- struct sysdev_driver * drv;
- pr_debug(" %s\n",kobject_name(&sysdev->kobj));
-
- /* First, call the class-specific one */
- if (cls->resume)
- cls->resume(sysdev);
-
- /* Call auxillary drivers next. */
- list_for_each_entry(drv,&cls->drivers,entry) {
- if (drv->resume)
- drv->resume(sysdev);
- }
-
- /* Call global drivers. */
- list_for_each_entry(drv,&global_drivers,entry) {
- if (drv->resume)
- drv->resume(sysdev);
- }
+ list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
+ pr_debug(" %s\n", kobject_name(&sysdev->kobj));
+ __sysdev_resume(sysdev);
}
}
return 0;
return subsystem_register(&system_subsys);
}
-EXPORT_SYMBOL(sysdev_register);
-EXPORT_SYMBOL(sysdev_unregister);
+EXPORT_SYMBOL_GPL(sysdev_register);
+EXPORT_SYMBOL_GPL(sysdev_unregister);
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