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Diffstat (limited to 'drivers/base/class.c')
-rw-r--r--drivers/base/class.c319
1 files changed, 231 insertions, 88 deletions
diff --git a/drivers/base/class.c b/drivers/base/class.c
index a863bb091e1..9d915376c31 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -17,16 +17,17 @@
#include <linux/kdev_t.h>
#include <linux/err.h>
#include <linux/slab.h>
+#include <linux/genhd.h>
#include "base.h"
#define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
#define to_class(obj) container_of(obj, struct class, subsys.kobj)
-static ssize_t
-class_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
+static ssize_t class_attr_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
{
- struct class_attribute * class_attr = to_class_attr(attr);
- struct class * dc = to_class(kobj);
+ struct class_attribute *class_attr = to_class_attr(attr);
+ struct class *dc = to_class(kobj);
ssize_t ret = -EIO;
if (class_attr->show)
@@ -34,12 +35,11 @@ class_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
return ret;
}
-static ssize_t
-class_attr_store(struct kobject * kobj, struct attribute * attr,
- const char * buf, size_t count)
+static ssize_t class_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t count)
{
- struct class_attribute * class_attr = to_class_attr(attr);
- struct class * dc = to_class(kobj);
+ struct class_attribute *class_attr = to_class_attr(attr);
+ struct class *dc = to_class(kobj);
ssize_t ret = -EIO;
if (class_attr->store)
@@ -47,7 +47,7 @@ class_attr_store(struct kobject * kobj, struct attribute * attr,
return ret;
}
-static void class_release(struct kobject * kobj)
+static void class_release(struct kobject *kobj)
{
struct class *class = to_class(kobj);
@@ -71,20 +71,20 @@ static struct kobj_type class_ktype = {
};
/* Hotplug events for classes go to the class_obj subsys */
-static decl_subsys(class, &class_ktype, NULL);
+static struct kset *class_kset;
-int class_create_file(struct class * cls, const struct class_attribute * attr)
+int class_create_file(struct class *cls, const struct class_attribute *attr)
{
int error;
- if (cls) {
+ if (cls)
error = sysfs_create_file(&cls->subsys.kobj, &attr->attr);
- } else
+ else
error = -EINVAL;
return error;
}
-void class_remove_file(struct class * cls, const struct class_attribute * attr)
+void class_remove_file(struct class *cls, const struct class_attribute *attr)
{
if (cls)
sysfs_remove_file(&cls->subsys.kobj, &attr->attr);
@@ -93,48 +93,48 @@ void class_remove_file(struct class * cls, const struct class_attribute * attr)
static struct class *class_get(struct class *cls)
{
if (cls)
- return container_of(kset_get(&cls->subsys), struct class, subsys);
+ return container_of(kset_get(&cls->subsys),
+ struct class, subsys);
return NULL;
}
-static void class_put(struct class * cls)
+static void class_put(struct class *cls)
{
if (cls)
kset_put(&cls->subsys);
}
-
-static int add_class_attrs(struct class * cls)
+static int add_class_attrs(struct class *cls)
{
int i;
int error = 0;
if (cls->class_attrs) {
for (i = 0; attr_name(cls->class_attrs[i]); i++) {
- error = class_create_file(cls,&cls->class_attrs[i]);
+ error = class_create_file(cls, &cls->class_attrs[i]);
if (error)
- goto Err;
+ goto error;
}
}
- Done:
+done:
return error;
- Err:
+error:
while (--i >= 0)
- class_remove_file(cls,&cls->class_attrs[i]);
- goto Done;
+ class_remove_file(cls, &cls->class_attrs[i]);
+ goto done;
}
-static void remove_class_attrs(struct class * cls)
+static void remove_class_attrs(struct class *cls)
{
int i;
if (cls->class_attrs) {
for (i = 0; attr_name(cls->class_attrs[i]); i++)
- class_remove_file(cls,&cls->class_attrs[i]);
+ class_remove_file(cls, &cls->class_attrs[i]);
}
}
-int class_register(struct class * cls)
+int class_register(struct class *cls)
{
int error;
@@ -149,9 +149,16 @@ int class_register(struct class * cls)
if (error)
return error;
- cls->subsys.kobj.kset = &class_subsys;
+#if defined(CONFIG_SYSFS_DEPRECATED) && defined(CONFIG_BLOCK)
+ /* let the block class directory show up in the root of sysfs */
+ if (cls != &block_class)
+ cls->subsys.kobj.kset = class_kset;
+#else
+ cls->subsys.kobj.kset = class_kset;
+#endif
+ cls->subsys.kobj.ktype = &class_ktype;
- error = subsystem_register(&cls->subsys);
+ error = kset_register(&cls->subsys);
if (!error) {
error = add_class_attrs(class_get(cls));
class_put(cls);
@@ -159,11 +166,11 @@ int class_register(struct class * cls)
return error;
}
-void class_unregister(struct class * cls)
+void class_unregister(struct class *cls)
{
pr_debug("device class '%s': unregistering\n", cls->name);
remove_class_attrs(cls);
- subsystem_unregister(&cls->subsys);
+ kset_unregister(&cls->subsys);
}
static void class_create_release(struct class *cls)
@@ -241,8 +248,8 @@ void class_destroy(struct class *cls)
/* Class Device Stuff */
-int class_device_create_file(struct class_device * class_dev,
- const struct class_device_attribute * attr)
+int class_device_create_file(struct class_device *class_dev,
+ const struct class_device_attribute *attr)
{
int error = -EINVAL;
if (class_dev)
@@ -250,8 +257,8 @@ int class_device_create_file(struct class_device * class_dev,
return error;
}
-void class_device_remove_file(struct class_device * class_dev,
- const struct class_device_attribute * attr)
+void class_device_remove_file(struct class_device *class_dev,
+ const struct class_device_attribute *attr)
{
if (class_dev)
sysfs_remove_file(&class_dev->kobj, &attr->attr);
@@ -273,12 +280,11 @@ void class_device_remove_bin_file(struct class_device *class_dev,
sysfs_remove_bin_file(&class_dev->kobj, attr);
}
-static ssize_t
-class_device_attr_show(struct kobject * kobj, struct attribute * attr,
- char * buf)
+static ssize_t class_device_attr_show(struct kobject *kobj,
+ struct attribute *attr, char *buf)
{
- struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
- struct class_device * cd = to_class_dev(kobj);
+ struct class_device_attribute *class_dev_attr = to_class_dev_attr(attr);
+ struct class_device *cd = to_class_dev(kobj);
ssize_t ret = 0;
if (class_dev_attr->show)
@@ -286,12 +292,12 @@ class_device_attr_show(struct kobject * kobj, struct attribute * attr,
return ret;
}
-static ssize_t
-class_device_attr_store(struct kobject * kobj, struct attribute * attr,
- const char * buf, size_t count)
+static ssize_t class_device_attr_store(struct kobject *kobj,
+ struct attribute *attr,
+ const char *buf, size_t count)
{
- struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
- struct class_device * cd = to_class_dev(kobj);
+ struct class_device_attribute *class_dev_attr = to_class_dev_attr(attr);
+ struct class_device *cd = to_class_dev(kobj);
ssize_t ret = 0;
if (class_dev_attr->store)
@@ -304,10 +310,10 @@ static struct sysfs_ops class_dev_sysfs_ops = {
.store = class_device_attr_store,
};
-static void class_dev_release(struct kobject * kobj)
+static void class_dev_release(struct kobject *kobj)
{
struct class_device *cd = to_class_dev(kobj);
- struct class * cls = cd->class;
+ struct class *cls = cd->class;
pr_debug("device class '%s': release.\n", cd->class_id);
@@ -316,8 +322,8 @@ static void class_dev_release(struct kobject * kobj)
else if (cls->release)
cls->release(cd);
else {
- printk(KERN_ERR "Class Device '%s' does not have a release() function, "
- "it is broken and must be fixed.\n",
+ printk(KERN_ERR "Class Device '%s' does not have a release() "
+ "function, it is broken and must be fixed.\n",
cd->class_id);
WARN_ON(1);
}
@@ -428,7 +434,8 @@ static int class_uevent(struct kset *kset, struct kobject *kobj,
add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);
if (dev->driver)
- add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name);
+ add_uevent_var(env, "PHYSDEVDRIVER=%s",
+ dev->driver->name);
}
if (class_dev->uevent) {
@@ -452,43 +459,49 @@ static struct kset_uevent_ops class_uevent_ops = {
.uevent = class_uevent,
};
-static decl_subsys(class_obj, &class_device_ktype, &class_uevent_ops);
-
+/*
+ * DO NOT copy how this is created, kset_create_and_add() should be
+ * called, but this is a hold-over from the old-way and will be deleted
+ * entirely soon.
+ */
+static struct kset class_obj_subsys = {
+ .uevent_ops = &class_uevent_ops,
+};
-static int class_device_add_attrs(struct class_device * cd)
+static int class_device_add_attrs(struct class_device *cd)
{
int i;
int error = 0;
- struct class * cls = cd->class;
+ struct class *cls = cd->class;
if (cls->class_dev_attrs) {
for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) {
error = class_device_create_file(cd,
- &cls->class_dev_attrs[i]);
+ &cls->class_dev_attrs[i]);
if (error)
- goto Err;
+ goto err;
}
}
- Done:
+done:
return error;
- Err:
+err:
while (--i >= 0)
- class_device_remove_file(cd,&cls->class_dev_attrs[i]);
- goto Done;
+ class_device_remove_file(cd, &cls->class_dev_attrs[i]);
+ goto done;
}
-static void class_device_remove_attrs(struct class_device * cd)
+static void class_device_remove_attrs(struct class_device *cd)
{
int i;
- struct class * cls = cd->class;
+ struct class *cls = cd->class;
if (cls->class_dev_attrs) {
for (i = 0; attr_name(cls->class_dev_attrs[i]); i++)
- class_device_remove_file(cd,&cls->class_dev_attrs[i]);
+ class_device_remove_file(cd, &cls->class_dev_attrs[i]);
}
}
-static int class_device_add_groups(struct class_device * cd)
+static int class_device_add_groups(struct class_device *cd)
{
int i;
int error = 0;
@@ -498,7 +511,8 @@ static int class_device_add_groups(struct class_device * cd)
error = sysfs_create_group(&cd->kobj, cd->groups[i]);
if (error) {
while (--i >= 0)
- sysfs_remove_group(&cd->kobj, cd->groups[i]);
+ sysfs_remove_group(&cd->kobj,
+ cd->groups[i]);
goto out;
}
}
@@ -507,14 +521,12 @@ out:
return error;
}
-static void class_device_remove_groups(struct class_device * cd)
+static void class_device_remove_groups(struct class_device *cd)
{
int i;
- if (cd->groups) {
- for (i = 0; cd->groups[i]; i++) {
+ if (cd->groups)
+ for (i = 0; cd->groups[i]; i++)
sysfs_remove_group(&cd->kobj, cd->groups[i]);
- }
- }
}
static ssize_t show_dev(struct class_device *class_dev, char *buf)
@@ -537,8 +549,8 @@ static struct class_device_attribute class_uevent_attr =
void class_device_initialize(struct class_device *class_dev)
{
- kobj_set_kset_s(class_dev, class_obj_subsys);
- kobject_init(&class_dev->kobj);
+ class_dev->kobj.kset = &class_obj_subsys;
+ kobject_init(&class_dev->kobj, &class_device_ktype);
INIT_LIST_HEAD(&class_dev->node);
}
@@ -566,16 +578,13 @@ int class_device_add(struct class_device *class_dev)
class_dev->class_id);
/* first, register with generic layer. */
- error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
- if (error)
- goto out2;
-
if (parent_class_dev)
class_dev->kobj.parent = &parent_class_dev->kobj;
else
class_dev->kobj.parent = &parent_class->subsys.kobj;
- error = kobject_add(&class_dev->kobj);
+ error = kobject_add(&class_dev->kobj, class_dev->kobj.parent,
+ "%s", class_dev->class_id);
if (error)
goto out2;
@@ -642,7 +651,7 @@ int class_device_add(struct class_device *class_dev)
out3:
kobject_del(&class_dev->kobj);
out2:
- if(parent_class_dev)
+ if (parent_class_dev)
class_device_put(parent_class_dev);
class_put(parent_class);
out1:
@@ -659,9 +668,11 @@ int class_device_register(struct class_device *class_dev)
/**
* class_device_create - creates a class device and registers it with sysfs
* @cls: pointer to the struct class that this device should be registered to.
- * @parent: pointer to the parent struct class_device of this new device, if any.
+ * @parent: pointer to the parent struct class_device of this new device, if
+ * any.
* @devt: the dev_t for the char device to be added.
- * @device: a pointer to a struct device that is assiociated with this class device.
+ * @device: a pointer to a struct device that is assiociated with this class
+ * device.
* @fmt: string for the class device's name
*
* This function can be used by char device classes. A struct
@@ -785,7 +796,7 @@ void class_device_destroy(struct class *cls, dev_t devt)
class_device_unregister(class_dev);
}
-struct class_device * class_device_get(struct class_device *class_dev)
+struct class_device *class_device_get(struct class_device *class_dev)
{
if (class_dev)
return to_class_dev(kobject_get(&class_dev->kobj));
@@ -798,6 +809,139 @@ void class_device_put(struct class_device *class_dev)
kobject_put(&class_dev->kobj);
}
+/**
+ * class_for_each_device - device iterator
+ * @class: the class we're iterating
+ * @data: data for the callback
+ * @fn: function to be called for each device
+ *
+ * Iterate over @class's list of devices, and call @fn for each,
+ * passing it @data.
+ *
+ * We check the return of @fn each time. If it returns anything
+ * other than 0, we break out and return that value.
+ *
+ * Note, we hold class->sem in this function, so it can not be
+ * re-acquired in @fn, otherwise it will self-deadlocking. For
+ * example, calls to add or remove class members would be verboten.
+ */
+int class_for_each_device(struct class *class, void *data,
+ int (*fn)(struct device *, void *))
+{
+ struct device *dev;
+ int error = 0;
+
+ if (!class)
+ return -EINVAL;
+ down(&class->sem);
+ list_for_each_entry(dev, &class->devices, node) {
+ dev = get_device(dev);
+ if (dev) {
+ error = fn(dev, data);
+ put_device(dev);
+ } else
+ error = -ENODEV;
+ if (error)
+ break;
+ }
+ up(&class->sem);
+
+ return error;
+}
+EXPORT_SYMBOL_GPL(class_for_each_device);
+
+/**
+ * class_find_device - device iterator for locating a particular device
+ * @class: the class we're iterating
+ * @data: data for the match function
+ * @match: function to check device
+ *
+ * This is similar to the class_for_each_dev() function above, but it
+ * returns a reference to a device that is 'found' for later use, as
+ * determined by the @match callback.
+ *
+ * The callback should return 0 if the device doesn't match and non-zero
+ * if it does. If the callback returns non-zero, this function will
+ * return to the caller and not iterate over any more devices.
+ *
+ * Note, you will need to drop the reference with put_device() after use.
+ *
+ * We hold class->sem in this function, so it can not be
+ * re-acquired in @match, otherwise it will self-deadlocking. For
+ * example, calls to add or remove class members would be verboten.
+ */
+struct device *class_find_device(struct class *class, void *data,
+ int (*match)(struct device *, void *))
+{
+ struct device *dev;
+ int found = 0;
+
+ if (!class)
+ return NULL;
+
+ down(&class->sem);
+ list_for_each_entry(dev, &class->devices, node) {
+ dev = get_device(dev);
+ if (dev) {
+ if (match(dev, data)) {
+ found = 1;
+ break;
+ } else
+ put_device(dev);
+ } else
+ break;
+ }
+ up(&class->sem);
+
+ return found ? dev : NULL;
+}
+EXPORT_SYMBOL_GPL(class_find_device);
+
+/**
+ * class_find_child - device iterator for locating a particular class_device
+ * @class: the class we're iterating
+ * @data: data for the match function
+ * @match: function to check class_device
+ *
+ * This function returns a reference to a class_device that is 'found' for
+ * later use, as determined by the @match callback.
+ *
+ * The callback should return 0 if the class_device doesn't match and non-zero
+ * if it does. If the callback returns non-zero, this function will
+ * return to the caller and not iterate over any more class_devices.
+ *
+ * Note, you will need to drop the reference with class_device_put() after use.
+ *
+ * We hold class->sem in this function, so it can not be
+ * re-acquired in @match, otherwise it will self-deadlocking. For
+ * example, calls to add or remove class members would be verboten.
+ */
+struct class_device *class_find_child(struct class *class, void *data,
+ int (*match)(struct class_device *, void *))
+{
+ struct class_device *dev;
+ int found = 0;
+
+ if (!class)
+ return NULL;
+
+ down(&class->sem);
+ list_for_each_entry(dev, &class->children, node) {
+ dev = class_device_get(dev);
+ if (dev) {
+ if (match(dev, data)) {
+ found = 1;
+ break;
+ } else
+ class_device_put(dev);
+ } else
+ break;
+ }
+ up(&class->sem);
+
+ return found ? dev : NULL;
+}
+EXPORT_SYMBOL_GPL(class_find_child);
int class_interface_register(struct class_interface *class_intf)
{
@@ -829,7 +973,7 @@ int class_interface_register(struct class_interface *class_intf)
void class_interface_unregister(struct class_interface *class_intf)
{
- struct class * parent = class_intf->class;
+ struct class *parent = class_intf->class;
struct class_device *class_dev;
struct device *dev;
@@ -853,15 +997,14 @@ void class_interface_unregister(struct class_interface *class_intf)
int __init classes_init(void)
{
- int retval;
-
- retval = subsystem_register(&class_subsys);
- if (retval)
- return retval;
+ class_kset = kset_create_and_add("class", NULL, NULL);
+ if (!class_kset)
+ return -ENOMEM;
/* ick, this is ugly, the things we go through to keep from showing up
* in sysfs... */
kset_init(&class_obj_subsys);
+ kobject_set_name(&class_obj_subsys.kobj, "class_obj");
if (!class_obj_subsys.kobj.parent)
class_obj_subsys.kobj.parent = &class_obj_subsys.kobj;
return 0;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-18 17:37:23 +0000