mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 02:23:16 +00:00
79f0313bfc
If kobject_init_and_add fails, sysdev_register should not send KOBJ_ADD uevent to userspace. Signed-off-by: Xiaotian Feng <dfeng@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
556 lines
14 KiB
C
556 lines
14 KiB
C
/*
|
|
* sys.c - pseudo-bus for system 'devices' (cpus, PICs, timers, etc)
|
|
*
|
|
* Copyright (c) 2002-3 Patrick Mochel
|
|
* 2002-3 Open Source Development Lab
|
|
*
|
|
* This file is released under the GPLv2
|
|
*
|
|
* 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/sysdev.h>
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/string.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/device.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
#include "base.h"
|
|
|
|
#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
|
|
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, sysdev_attr, buffer);
|
|
return -EIO;
|
|
}
|
|
|
|
|
|
static ssize_t
|
|
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, sysdev_attr, buffer, count);
|
|
return -EIO;
|
|
}
|
|
|
|
static struct sysfs_ops sysfs_ops = {
|
|
.show = sysdev_show,
|
|
.store = sysdev_store,
|
|
};
|
|
|
|
static struct kobj_type ktype_sysdev = {
|
|
.sysfs_ops = &sysfs_ops,
|
|
};
|
|
|
|
|
|
int sysdev_create_file(struct sys_device *s, struct sysdev_attribute *a)
|
|
{
|
|
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);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(sysdev_create_file);
|
|
EXPORT_SYMBOL_GPL(sysdev_remove_file);
|
|
|
|
#define to_sysdev_class(k) container_of(k, struct sysdev_class, kset.kobj)
|
|
#define to_sysdev_class_attr(a) container_of(a, \
|
|
struct sysdev_class_attribute, attr)
|
|
|
|
static ssize_t sysdev_class_show(struct kobject *kobj, struct attribute *attr,
|
|
char *buffer)
|
|
{
|
|
struct sysdev_class *class = to_sysdev_class(kobj);
|
|
struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);
|
|
|
|
if (class_attr->show)
|
|
return class_attr->show(class, buffer);
|
|
return -EIO;
|
|
}
|
|
|
|
static ssize_t sysdev_class_store(struct kobject *kobj, struct attribute *attr,
|
|
const char *buffer, size_t count)
|
|
{
|
|
struct sysdev_class *class = to_sysdev_class(kobj);
|
|
struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);
|
|
|
|
if (class_attr->store)
|
|
return class_attr->store(class, buffer, count);
|
|
return -EIO;
|
|
}
|
|
|
|
static struct sysfs_ops sysfs_class_ops = {
|
|
.show = sysdev_class_show,
|
|
.store = sysdev_class_store,
|
|
};
|
|
|
|
static struct kobj_type ktype_sysdev_class = {
|
|
.sysfs_ops = &sysfs_class_ops,
|
|
};
|
|
|
|
int sysdev_class_create_file(struct sysdev_class *c,
|
|
struct sysdev_class_attribute *a)
|
|
{
|
|
return sysfs_create_file(&c->kset.kobj, &a->attr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sysdev_class_create_file);
|
|
|
|
void sysdev_class_remove_file(struct sysdev_class *c,
|
|
struct sysdev_class_attribute *a)
|
|
{
|
|
sysfs_remove_file(&c->kset.kobj, &a->attr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sysdev_class_remove_file);
|
|
|
|
static struct kset *system_kset;
|
|
|
|
int sysdev_class_register(struct sysdev_class *cls)
|
|
{
|
|
int retval;
|
|
|
|
pr_debug("Registering sysdev class '%s'\n", cls->name);
|
|
|
|
INIT_LIST_HEAD(&cls->drivers);
|
|
memset(&cls->kset.kobj, 0x00, sizeof(struct kobject));
|
|
cls->kset.kobj.parent = &system_kset->kobj;
|
|
cls->kset.kobj.ktype = &ktype_sysdev_class;
|
|
cls->kset.kobj.kset = system_kset;
|
|
|
|
retval = kobject_set_name(&cls->kset.kobj, "%s", cls->name);
|
|
if (retval)
|
|
return retval;
|
|
|
|
return kset_register(&cls->kset);
|
|
}
|
|
|
|
void sysdev_class_unregister(struct sysdev_class *cls)
|
|
{
|
|
pr_debug("Unregistering sysdev class '%s'\n",
|
|
kobject_name(&cls->kset.kobj));
|
|
kset_unregister(&cls->kset);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(sysdev_class_register);
|
|
EXPORT_SYMBOL_GPL(sysdev_class_unregister);
|
|
|
|
static DEFINE_MUTEX(sysdev_drivers_lock);
|
|
|
|
/**
|
|
* sysdev_driver_register - Register auxillary driver
|
|
* @cls: Device class driver belongs to.
|
|
* @drv: Driver.
|
|
*
|
|
* @drv is inserted into @cls->drivers to be
|
|
* called on each operation on devices of that class. The refcount
|
|
* of @cls is incremented.
|
|
*/
|
|
|
|
int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv)
|
|
{
|
|
int err = 0;
|
|
|
|
if (!cls) {
|
|
WARN(1, KERN_WARNING "sysdev: invalid class passed to "
|
|
"sysdev_driver_register!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Check whether this driver has already been added to a class. */
|
|
if (drv->entry.next && !list_empty(&drv->entry))
|
|
WARN(1, KERN_WARNING "sysdev: class %s: driver (%p) has already"
|
|
" been registered to a class, something is wrong, but "
|
|
"will forge on!\n", cls->name, drv);
|
|
|
|
mutex_lock(&sysdev_drivers_lock);
|
|
if (cls && kset_get(&cls->kset)) {
|
|
list_add_tail(&drv->entry, &cls->drivers);
|
|
|
|
/* If devices of this class already exist, tell the driver */
|
|
if (drv->add) {
|
|
struct sys_device *dev;
|
|
list_for_each_entry(dev, &cls->kset.list, kobj.entry)
|
|
drv->add(dev);
|
|
}
|
|
} else {
|
|
err = -EINVAL;
|
|
WARN(1, KERN_ERR "%s: invalid device class\n", __func__);
|
|
}
|
|
mutex_unlock(&sysdev_drivers_lock);
|
|
return err;
|
|
}
|
|
|
|
|
|
/**
|
|
* sysdev_driver_unregister - Remove an auxillary driver.
|
|
* @cls: Class driver belongs to.
|
|
* @drv: Driver.
|
|
*/
|
|
void sysdev_driver_unregister(struct sysdev_class *cls,
|
|
struct sysdev_driver *drv)
|
|
{
|
|
mutex_lock(&sysdev_drivers_lock);
|
|
list_del_init(&drv->entry);
|
|
if (cls) {
|
|
if (drv->remove) {
|
|
struct sys_device *dev;
|
|
list_for_each_entry(dev, &cls->kset.list, kobj.entry)
|
|
drv->remove(dev);
|
|
}
|
|
kset_put(&cls->kset);
|
|
}
|
|
mutex_unlock(&sysdev_drivers_lock);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(sysdev_driver_register);
|
|
EXPORT_SYMBOL_GPL(sysdev_driver_unregister);
|
|
|
|
|
|
|
|
/**
|
|
* sysdev_register - add a system device to the tree
|
|
* @sysdev: device in question
|
|
*
|
|
*/
|
|
int sysdev_register(struct sys_device *sysdev)
|
|
{
|
|
int error;
|
|
struct sysdev_class *cls = sysdev->cls;
|
|
|
|
if (!cls)
|
|
return -EINVAL;
|
|
|
|
pr_debug("Registering sys device of class '%s'\n",
|
|
kobject_name(&cls->kset.kobj));
|
|
|
|
/* initialize the kobject to 0, in case it had previously been used */
|
|
memset(&sysdev->kobj, 0x00, sizeof(struct kobject));
|
|
|
|
/* Make sure the kset is set */
|
|
sysdev->kobj.kset = &cls->kset;
|
|
|
|
/* Register the object */
|
|
error = kobject_init_and_add(&sysdev->kobj, &ktype_sysdev, NULL,
|
|
"%s%d", kobject_name(&cls->kset.kobj),
|
|
sysdev->id);
|
|
|
|
if (!error) {
|
|
struct sysdev_driver *drv;
|
|
|
|
pr_debug("Registering sys device '%s'\n",
|
|
kobject_name(&sysdev->kobj));
|
|
|
|
mutex_lock(&sysdev_drivers_lock);
|
|
/* Generic notification is implicit, because it's that
|
|
* code that should have called us.
|
|
*/
|
|
|
|
/* Notify class auxillary drivers */
|
|
list_for_each_entry(drv, &cls->drivers, entry) {
|
|
if (drv->add)
|
|
drv->add(sysdev);
|
|
}
|
|
mutex_unlock(&sysdev_drivers_lock);
|
|
kobject_uevent(&sysdev->kobj, KOBJ_ADD);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
void sysdev_unregister(struct sys_device *sysdev)
|
|
{
|
|
struct sysdev_driver *drv;
|
|
|
|
mutex_lock(&sysdev_drivers_lock);
|
|
list_for_each_entry(drv, &sysdev->cls->drivers, entry) {
|
|
if (drv->remove)
|
|
drv->remove(sysdev);
|
|
}
|
|
mutex_unlock(&sysdev_drivers_lock);
|
|
|
|
kobject_put(&sysdev->kobj);
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* sysdev_shutdown - Shut down all system devices.
|
|
*
|
|
* 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 auxillaries,
|
|
* and the class driver.
|
|
*
|
|
* Note: The list is iterated in reverse order, so that we shut down
|
|
* child devices before we shut down their parents. The list ordering
|
|
* is guaranteed by virtue of the fact that child devices are registered
|
|
* after their parents.
|
|
*/
|
|
void sysdev_shutdown(void)
|
|
{
|
|
struct sysdev_class *cls;
|
|
|
|
pr_debug("Shutting Down System Devices\n");
|
|
|
|
mutex_lock(&sysdev_drivers_lock);
|
|
list_for_each_entry_reverse(cls, &system_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) {
|
|
struct sysdev_driver *drv;
|
|
pr_debug(" %s\n", kobject_name(&sysdev->kobj));
|
|
|
|
/* Call auxillary drivers first */
|
|
list_for_each_entry(drv, &cls->drivers, entry) {
|
|
if (drv->shutdown)
|
|
drv->shutdown(sysdev);
|
|
}
|
|
|
|
/* Now call the generic one */
|
|
if (cls->shutdown)
|
|
cls->shutdown(sysdev);
|
|
}
|
|
}
|
|
mutex_unlock(&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);
|
|
WARN_ONCE(!irqs_disabled(),
|
|
"Interrupts enabled after %pF\n", cls->resume);
|
|
|
|
/* Call auxillary drivers next. */
|
|
list_for_each_entry(drv, &cls->drivers, entry) {
|
|
if (drv->resume)
|
|
drv->resume(dev);
|
|
WARN_ONCE(!irqs_disabled(),
|
|
"Interrupts enabled after %pF\n", drv->resume);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* sysdev_suspend - Suspend all system devices.
|
|
* @state: Power state to enter.
|
|
*
|
|
* We perform an almost identical operation as sysdev_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.
|
|
*
|
|
* This is only called by the device PM core, so we let them handle
|
|
* all synchronization.
|
|
*/
|
|
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("Checking wake-up interrupts\n");
|
|
|
|
/* Return error code if there are any wake-up interrupts pending */
|
|
ret = check_wakeup_irqs();
|
|
if (ret)
|
|
return ret;
|
|
|
|
WARN_ONCE(!irqs_disabled(),
|
|
"Interrupts enabled while suspending system devices\n");
|
|
|
|
pr_debug("Suspending System Devices\n");
|
|
|
|
list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) {
|
|
pr_debug("Suspending type '%s':\n",
|
|
kobject_name(&cls->kset.kobj));
|
|
|
|
list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
|
|
pr_debug(" %s\n", kobject_name(&sysdev->kobj));
|
|
|
|
/* Call auxillary drivers first */
|
|
list_for_each_entry(drv, &cls->drivers, entry) {
|
|
if (drv->suspend) {
|
|
ret = drv->suspend(sysdev, state);
|
|
if (ret)
|
|
goto aux_driver;
|
|
}
|
|
WARN_ONCE(!irqs_disabled(),
|
|
"Interrupts enabled after %pF\n",
|
|
drv->suspend);
|
|
}
|
|
|
|
/* Now call the generic one */
|
|
if (cls->suspend) {
|
|
ret = cls->suspend(sysdev, state);
|
|
if (ret)
|
|
goto cls_driver;
|
|
WARN_ONCE(!irqs_disabled(),
|
|
"Interrupts enabled after %pF\n",
|
|
cls->suspend);
|
|
}
|
|
}
|
|
}
|
|
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);
|
|
}
|
|
|
|
/* 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_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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sysdev_suspend);
|
|
|
|
/**
|
|
* sysdev_resume - Bring system devices back to life.
|
|
*
|
|
* Similar to sysdev_suspend(), but we iterate the list forwards
|
|
* to guarantee that parent devices are resumed before their children.
|
|
*
|
|
* Note: Interrupts are disabled when called.
|
|
*/
|
|
int sysdev_resume(void)
|
|
{
|
|
struct sysdev_class *cls;
|
|
|
|
WARN_ONCE(!irqs_disabled(),
|
|
"Interrupts enabled while resuming system devices\n");
|
|
|
|
pr_debug("Resuming System Devices\n");
|
|
|
|
list_for_each_entry(cls, &system_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) {
|
|
pr_debug(" %s\n", kobject_name(&sysdev->kobj));
|
|
|
|
__sysdev_resume(sysdev);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sysdev_resume);
|
|
|
|
int __init system_bus_init(void)
|
|
{
|
|
system_kset = kset_create_and_add("system", NULL, &devices_kset->kobj);
|
|
if (!system_kset)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(sysdev_register);
|
|
EXPORT_SYMBOL_GPL(sysdev_unregister);
|
|
|
|
#define to_ext_attr(x) container_of(x, struct sysdev_ext_attribute, attr)
|
|
|
|
ssize_t sysdev_store_ulong(struct sys_device *sysdev,
|
|
struct sysdev_attribute *attr,
|
|
const char *buf, size_t size)
|
|
{
|
|
struct sysdev_ext_attribute *ea = to_ext_attr(attr);
|
|
char *end;
|
|
unsigned long new = simple_strtoul(buf, &end, 0);
|
|
if (end == buf)
|
|
return -EINVAL;
|
|
*(unsigned long *)(ea->var) = new;
|
|
/* Always return full write size even if we didn't consume all */
|
|
return size;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sysdev_store_ulong);
|
|
|
|
ssize_t sysdev_show_ulong(struct sys_device *sysdev,
|
|
struct sysdev_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct sysdev_ext_attribute *ea = to_ext_attr(attr);
|
|
return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var));
|
|
}
|
|
EXPORT_SYMBOL_GPL(sysdev_show_ulong);
|
|
|
|
ssize_t sysdev_store_int(struct sys_device *sysdev,
|
|
struct sysdev_attribute *attr,
|
|
const char *buf, size_t size)
|
|
{
|
|
struct sysdev_ext_attribute *ea = to_ext_attr(attr);
|
|
char *end;
|
|
long new = simple_strtol(buf, &end, 0);
|
|
if (end == buf || new > INT_MAX || new < INT_MIN)
|
|
return -EINVAL;
|
|
*(int *)(ea->var) = new;
|
|
/* Always return full write size even if we didn't consume all */
|
|
return size;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sysdev_store_int);
|
|
|
|
ssize_t sysdev_show_int(struct sys_device *sysdev,
|
|
struct sysdev_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct sysdev_ext_attribute *ea = to_ext_attr(attr);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var));
|
|
}
|
|
EXPORT_SYMBOL_GPL(sysdev_show_int);
|
|
|