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https://github.com/followmsi/android_kernel_google_msm.git
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drivers: Resurrect sysdev
We still need this for socinfo, so let's keep it around for a little longer. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Stephen Boyd
parent
1aa4bfe39e
commit
21b546c933
4 changed files with 549 additions and 1 deletions
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@ -4,7 +4,7 @@ obj-y := core.o bus.o dd.o syscore.o \
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driver.o class.o platform.o \
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cpu.o firmware.o init.o map.o devres.o \
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attribute_container.o transport_class.o \
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topology.o
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topology.o sys.o
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obj-$(CONFIG_DEVTMPFS) += devtmpfs.o
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obj-y += power/
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obj-$(CONFIG_HAS_DMA) += dma-mapping.o
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@ -99,6 +99,7 @@ extern int hypervisor_init(void);
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static inline int hypervisor_init(void) { return 0; }
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#endif
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extern int platform_bus_init(void);
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extern int system_bus_init(void);
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extern void cpu_dev_init(void);
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extern int bus_add_device(struct device *dev);
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382
drivers/base/sys.c
Normal file
382
drivers/base/sys.c
Normal file
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@ -0,0 +1,382 @@
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/*
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* sys.c - pseudo-bus for system 'devices' (cpus, PICs, timers, etc)
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*
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* Copyright (c) 2002-3 Patrick Mochel
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* 2002-3 Open Source Development Lab
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*
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* This file is released under the GPLv2
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*
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* This exports a 'system' bus type.
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* By default, a 'sys' bus gets added to the root of the system. There will
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* always be core system devices. Devices can use sysdev_register() to
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* add themselves as children of the system bus.
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*/
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#include <linux/sysdev.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/pm.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/interrupt.h>
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#include "base.h"
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#define to_sysdev(k) container_of(k, struct sys_device, kobj)
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#define to_sysdev_attr(a) container_of(a, struct sysdev_attribute, attr)
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extern struct kset *system_kset;
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static ssize_t
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sysdev_show(struct kobject *kobj, struct attribute *attr, char *buffer)
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{
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struct sys_device *sysdev = to_sysdev(kobj);
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struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr);
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if (sysdev_attr->show)
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return sysdev_attr->show(sysdev, sysdev_attr, buffer);
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return -EIO;
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}
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static ssize_t
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sysdev_store(struct kobject *kobj, struct attribute *attr,
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const char *buffer, size_t count)
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{
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struct sys_device *sysdev = to_sysdev(kobj);
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struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr);
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if (sysdev_attr->store)
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return sysdev_attr->store(sysdev, sysdev_attr, buffer, count);
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return -EIO;
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}
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static const struct sysfs_ops sysfs_ops = {
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.show = sysdev_show,
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.store = sysdev_store,
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};
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static struct kobj_type ktype_sysdev = {
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.sysfs_ops = &sysfs_ops,
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};
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int sysdev_create_file(struct sys_device *s, struct sysdev_attribute *a)
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{
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return sysfs_create_file(&s->kobj, &a->attr);
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}
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void sysdev_remove_file(struct sys_device *s, struct sysdev_attribute *a)
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{
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sysfs_remove_file(&s->kobj, &a->attr);
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}
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EXPORT_SYMBOL_GPL(sysdev_create_file);
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EXPORT_SYMBOL_GPL(sysdev_remove_file);
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#define to_sysdev_class(k) container_of(k, struct sysdev_class, kset.kobj)
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#define to_sysdev_class_attr(a) container_of(a, \
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struct sysdev_class_attribute, attr)
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static ssize_t sysdev_class_show(struct kobject *kobj, struct attribute *attr,
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char *buffer)
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{
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struct sysdev_class *class = to_sysdev_class(kobj);
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struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);
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if (class_attr->show)
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return class_attr->show(class, class_attr, buffer);
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return -EIO;
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}
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static ssize_t sysdev_class_store(struct kobject *kobj, struct attribute *attr,
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const char *buffer, size_t count)
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{
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struct sysdev_class *class = to_sysdev_class(kobj);
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struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);
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if (class_attr->store)
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return class_attr->store(class, class_attr, buffer, count);
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return -EIO;
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}
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static const struct sysfs_ops sysfs_class_ops = {
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.show = sysdev_class_show,
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.store = sysdev_class_store,
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};
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static struct kobj_type ktype_sysdev_class = {
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.sysfs_ops = &sysfs_class_ops,
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};
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int sysdev_class_create_file(struct sysdev_class *c,
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struct sysdev_class_attribute *a)
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{
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return sysfs_create_file(&c->kset.kobj, &a->attr);
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}
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EXPORT_SYMBOL_GPL(sysdev_class_create_file);
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void sysdev_class_remove_file(struct sysdev_class *c,
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struct sysdev_class_attribute *a)
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{
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sysfs_remove_file(&c->kset.kobj, &a->attr);
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}
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EXPORT_SYMBOL_GPL(sysdev_class_remove_file);
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int sysdev_class_register(struct sysdev_class *cls)
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{
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int retval;
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pr_debug("Registering sysdev class '%s'\n", cls->name);
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INIT_LIST_HEAD(&cls->drivers);
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memset(&cls->kset.kobj, 0x00, sizeof(struct kobject));
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cls->kset.kobj.parent = &system_kset->kobj;
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cls->kset.kobj.ktype = &ktype_sysdev_class;
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cls->kset.kobj.kset = system_kset;
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retval = kobject_set_name(&cls->kset.kobj, "%s", cls->name);
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if (retval)
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return retval;
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retval = kset_register(&cls->kset);
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if (!retval && cls->attrs)
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retval = sysfs_create_files(&cls->kset.kobj,
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(const struct attribute **)cls->attrs);
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return retval;
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}
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void sysdev_class_unregister(struct sysdev_class *cls)
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{
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pr_debug("Unregistering sysdev class '%s'\n",
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kobject_name(&cls->kset.kobj));
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if (cls->attrs)
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sysfs_remove_files(&cls->kset.kobj,
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(const struct attribute **)cls->attrs);
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kset_unregister(&cls->kset);
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}
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EXPORT_SYMBOL_GPL(sysdev_class_register);
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EXPORT_SYMBOL_GPL(sysdev_class_unregister);
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static DEFINE_MUTEX(sysdev_drivers_lock);
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/*
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* @dev != NULL means that we're unwinding because some drv->add()
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* failed for some reason. You need to grab sysdev_drivers_lock before
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* calling this.
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*/
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static void __sysdev_driver_remove(struct sysdev_class *cls,
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struct sysdev_driver *drv,
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struct sys_device *from_dev)
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{
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struct sys_device *dev = from_dev;
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list_del_init(&drv->entry);
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if (!cls)
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return;
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if (!drv->remove)
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goto kset_put;
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if (dev)
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list_for_each_entry_continue_reverse(dev, &cls->kset.list,
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kobj.entry)
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drv->remove(dev);
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else
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list_for_each_entry(dev, &cls->kset.list, kobj.entry)
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drv->remove(dev);
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kset_put:
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kset_put(&cls->kset);
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}
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/**
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* sysdev_driver_register - Register auxiliary driver
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* @cls: Device class driver belongs to.
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* @drv: Driver.
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*
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* @drv is inserted into @cls->drivers to be
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* called on each operation on devices of that class. The refcount
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* of @cls is incremented.
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*/
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int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv)
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{
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struct sys_device *dev = NULL;
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int err = 0;
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if (!cls) {
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WARN(1, KERN_WARNING "sysdev: invalid class passed to %s!\n",
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__func__);
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return -EINVAL;
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}
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/* Check whether this driver has already been added to a class. */
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if (drv->entry.next && !list_empty(&drv->entry))
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WARN(1, KERN_WARNING "sysdev: class %s: driver (%p) has already"
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" been registered to a class, something is wrong, but "
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"will forge on!\n", cls->name, drv);
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mutex_lock(&sysdev_drivers_lock);
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if (cls && kset_get(&cls->kset)) {
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list_add_tail(&drv->entry, &cls->drivers);
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/* If devices of this class already exist, tell the driver */
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if (drv->add) {
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list_for_each_entry(dev, &cls->kset.list, kobj.entry) {
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err = drv->add(dev);
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if (err)
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goto unwind;
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}
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}
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} else {
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err = -EINVAL;
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WARN(1, KERN_ERR "%s: invalid device class\n", __func__);
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}
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goto unlock;
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unwind:
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__sysdev_driver_remove(cls, drv, dev);
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unlock:
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mutex_unlock(&sysdev_drivers_lock);
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return err;
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}
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/**
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* sysdev_driver_unregister - Remove an auxiliary driver.
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* @cls: Class driver belongs to.
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* @drv: Driver.
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*/
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void sysdev_driver_unregister(struct sysdev_class *cls,
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struct sysdev_driver *drv)
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{
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mutex_lock(&sysdev_drivers_lock);
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__sysdev_driver_remove(cls, drv, NULL);
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mutex_unlock(&sysdev_drivers_lock);
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}
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EXPORT_SYMBOL_GPL(sysdev_driver_register);
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EXPORT_SYMBOL_GPL(sysdev_driver_unregister);
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/**
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* sysdev_register - add a system device to the tree
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* @sysdev: device in question
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*
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*/
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int sysdev_register(struct sys_device *sysdev)
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{
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int error;
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struct sysdev_class *cls = sysdev->cls;
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if (!cls)
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return -EINVAL;
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pr_debug("Registering sys device of class '%s'\n",
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kobject_name(&cls->kset.kobj));
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/* initialize the kobject to 0, in case it had previously been used */
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memset(&sysdev->kobj, 0x00, sizeof(struct kobject));
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/* Make sure the kset is set */
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sysdev->kobj.kset = &cls->kset;
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/* Register the object */
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error = kobject_init_and_add(&sysdev->kobj, &ktype_sysdev, NULL,
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"%s%d", kobject_name(&cls->kset.kobj),
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sysdev->id);
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if (!error) {
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struct sysdev_driver *drv;
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pr_debug("Registering sys device '%s'\n",
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kobject_name(&sysdev->kobj));
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mutex_lock(&sysdev_drivers_lock);
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/* Generic notification is implicit, because it's that
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* code that should have called us.
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*/
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/* Notify class auxiliary drivers */
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list_for_each_entry(drv, &cls->drivers, entry) {
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if (drv->add)
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drv->add(sysdev);
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}
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mutex_unlock(&sysdev_drivers_lock);
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kobject_uevent(&sysdev->kobj, KOBJ_ADD);
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}
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return error;
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}
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void sysdev_unregister(struct sys_device *sysdev)
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{
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struct sysdev_driver *drv;
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mutex_lock(&sysdev_drivers_lock);
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list_for_each_entry(drv, &sysdev->cls->drivers, entry) {
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if (drv->remove)
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drv->remove(sysdev);
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}
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mutex_unlock(&sysdev_drivers_lock);
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kobject_put(&sysdev->kobj);
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}
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EXPORT_SYMBOL_GPL(sysdev_register);
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EXPORT_SYMBOL_GPL(sysdev_unregister);
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#define to_ext_attr(x) container_of(x, struct sysdev_ext_attribute, attr)
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ssize_t sysdev_store_ulong(struct sys_device *sysdev,
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struct sysdev_attribute *attr,
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const char *buf, size_t size)
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{
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struct sysdev_ext_attribute *ea = to_ext_attr(attr);
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char *end;
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unsigned long new = simple_strtoul(buf, &end, 0);
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if (end == buf)
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return -EINVAL;
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*(unsigned long *)(ea->var) = new;
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/* Always return full write size even if we didn't consume all */
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return size;
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}
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EXPORT_SYMBOL_GPL(sysdev_store_ulong);
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ssize_t sysdev_show_ulong(struct sys_device *sysdev,
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struct sysdev_attribute *attr,
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char *buf)
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{
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struct sysdev_ext_attribute *ea = to_ext_attr(attr);
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return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var));
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}
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EXPORT_SYMBOL_GPL(sysdev_show_ulong);
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ssize_t sysdev_store_int(struct sys_device *sysdev,
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struct sysdev_attribute *attr,
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const char *buf, size_t size)
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{
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struct sysdev_ext_attribute *ea = to_ext_attr(attr);
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char *end;
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long new = simple_strtol(buf, &end, 0);
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if (end == buf || new > INT_MAX || new < INT_MIN)
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return -EINVAL;
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*(int *)(ea->var) = new;
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/* Always return full write size even if we didn't consume all */
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return size;
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}
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EXPORT_SYMBOL_GPL(sysdev_store_int);
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ssize_t sysdev_show_int(struct sys_device *sysdev,
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struct sysdev_attribute *attr,
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char *buf)
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{
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struct sysdev_ext_attribute *ea = to_ext_attr(attr);
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return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var));
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}
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EXPORT_SYMBOL_GPL(sysdev_show_int);
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165
include/linux/sysdev.h
Normal file
165
include/linux/sysdev.h
Normal file
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@ -0,0 +1,165 @@
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/**
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* System devices follow a slightly different driver model.
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* They don't need to do dynammic driver binding, can't be probed,
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* and don't reside on any type of peripheral bus.
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* So, we represent and treat them a little differently.
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*
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* We still have a notion of a driver for a system device, because we still
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* want to perform basic operations on these devices.
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*
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* We also support auxiliary drivers binding to devices of a certain class.
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*
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* This allows configurable drivers to register themselves for devices of
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* a certain type. And, it allows class definitions to reside in generic
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* code while arch-specific code can register specific drivers.
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*
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* Auxiliary drivers registered with a NULL cls are registered as drivers
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* for all system devices, and get notification calls for each device.
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*/
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#ifndef _SYSDEV_H_
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#define _SYSDEV_H_
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#include <linux/kobject.h>
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#include <linux/module.h>
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#include <linux/pm.h>
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struct sys_device;
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struct sysdev_class_attribute;
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struct sysdev_class {
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const char *name;
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struct list_head drivers;
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struct sysdev_class_attribute **attrs;
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struct kset kset;
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};
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struct sysdev_class_attribute {
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struct attribute attr;
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ssize_t (*show)(struct sysdev_class *, struct sysdev_class_attribute *,
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char *);
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ssize_t (*store)(struct sysdev_class *, struct sysdev_class_attribute *,
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const char *, size_t);
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};
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#define _SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
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{ \
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.attr = {.name = __stringify(_name), .mode = _mode }, \
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.show = _show, \
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.store = _store, \
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}
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#define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
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struct sysdev_class_attribute attr_##_name = \
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_SYSDEV_CLASS_ATTR(_name,_mode,_show,_store)
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extern int sysdev_class_register(struct sysdev_class *);
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extern void sysdev_class_unregister(struct sysdev_class *);
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extern int sysdev_class_create_file(struct sysdev_class *,
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struct sysdev_class_attribute *);
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extern void sysdev_class_remove_file(struct sysdev_class *,
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struct sysdev_class_attribute *);
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/**
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* Auxiliary system device drivers.
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*/
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struct sysdev_driver {
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struct list_head entry;
|
||||
int (*add)(struct sys_device *);
|
||||
int (*remove)(struct sys_device *);
|
||||
};
|
||||
|
||||
|
||||
extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *);
|
||||
extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *);
|
||||
|
||||
|
||||
/**
|
||||
* sys_devices can be simplified a lot from regular devices, because they're
|
||||
* simply not as versatile.
|
||||
*/
|
||||
|
||||
struct sys_device {
|
||||
u32 id;
|
||||
struct sysdev_class * cls;
|
||||
struct kobject kobj;
|
||||
};
|
||||
|
||||
extern int sysdev_register(struct sys_device *);
|
||||
extern void sysdev_unregister(struct sys_device *);
|
||||
|
||||
|
||||
struct sysdev_attribute {
|
||||
struct attribute attr;
|
||||
ssize_t (*show)(struct sys_device *, struct sysdev_attribute *, char *);
|
||||
ssize_t (*store)(struct sys_device *, struct sysdev_attribute *,
|
||||
const char *, size_t);
|
||||
};
|
||||
|
||||
|
||||
#define _SYSDEV_ATTR(_name, _mode, _show, _store) \
|
||||
{ \
|
||||
.attr = { .name = __stringify(_name), .mode = _mode }, \
|
||||
.show = _show, \
|
||||
.store = _store, \
|
||||
}
|
||||
|
||||
#define SYSDEV_ATTR(_name, _mode, _show, _store) \
|
||||
struct sysdev_attribute attr_##_name = \
|
||||
_SYSDEV_ATTR(_name, _mode, _show, _store);
|
||||
|
||||
extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
|
||||
extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
|
||||
|
||||
/* Create/remove NULL terminated attribute list */
|
||||
static inline int
|
||||
sysdev_create_files(struct sys_device *d, struct sysdev_attribute **a)
|
||||
{
|
||||
return sysfs_create_files(&d->kobj, (const struct attribute **)a);
|
||||
}
|
||||
|
||||
static inline void
|
||||
sysdev_remove_files(struct sys_device *d, struct sysdev_attribute **a)
|
||||
{
|
||||
return sysfs_remove_files(&d->kobj, (const struct attribute **)a);
|
||||
}
|
||||
|
||||
struct sysdev_ext_attribute {
|
||||
struct sysdev_attribute attr;
|
||||
void *var;
|
||||
};
|
||||
|
||||
/*
|
||||
* Support for simple variable sysdev attributes.
|
||||
* The pointer to the variable is stored in a sysdev_ext_attribute
|
||||
*/
|
||||
|
||||
/* Add more types as needed */
|
||||
|
||||
extern ssize_t sysdev_show_ulong(struct sys_device *, struct sysdev_attribute *,
|
||||
char *);
|
||||
extern ssize_t sysdev_store_ulong(struct sys_device *,
|
||||
struct sysdev_attribute *, const char *, size_t);
|
||||
extern ssize_t sysdev_show_int(struct sys_device *, struct sysdev_attribute *,
|
||||
char *);
|
||||
extern ssize_t sysdev_store_int(struct sys_device *,
|
||||
struct sysdev_attribute *, const char *, size_t);
|
||||
|
||||
#define _SYSDEV_ULONG_ATTR(_name, _mode, _var) \
|
||||
{ _SYSDEV_ATTR(_name, _mode, sysdev_show_ulong, sysdev_store_ulong), \
|
||||
&(_var) }
|
||||
#define SYSDEV_ULONG_ATTR(_name, _mode, _var) \
|
||||
struct sysdev_ext_attribute attr_##_name = \
|
||||
_SYSDEV_ULONG_ATTR(_name, _mode, _var);
|
||||
#define _SYSDEV_INT_ATTR(_name, _mode, _var) \
|
||||
{ _SYSDEV_ATTR(_name, _mode, sysdev_show_int, sysdev_store_int), \
|
||||
&(_var) }
|
||||
#define SYSDEV_INT_ATTR(_name, _mode, _var) \
|
||||
struct sysdev_ext_attribute attr_##_name = \
|
||||
_SYSDEV_INT_ATTR(_name, _mode, _var);
|
||||
|
||||
#endif /* _SYSDEV_H_ */
|
||||
Loading…
Reference in a new issue