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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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9800794ac1
This adds a new sysdev_ext_attribute that stores a pointer to the variable it manages and some utility functions/macro to easily use them. Previously all users wrote custom macros to generate show/store functions for each variable, with this it is possible to avoid that in many cases. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
157 lines
4.6 KiB
C
157 lines
4.6 KiB
C
/**
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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 auxillary 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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* Auxillary 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 {
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const char *name;
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struct list_head drivers;
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/* Default operations for these types of devices */
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int (*shutdown)(struct sys_device *);
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int (*suspend)(struct sys_device *, pm_message_t state);
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int (*resume)(struct sys_device *);
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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 *, char *);
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ssize_t (*store)(struct sysdev_class *, 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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* Auxillary system device drivers.
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*/
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struct sysdev_driver {
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struct list_head entry;
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int (*add)(struct sys_device *);
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int (*remove)(struct sys_device *);
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int (*shutdown)(struct sys_device *);
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int (*suspend)(struct sys_device *, pm_message_t state);
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int (*resume)(struct sys_device *);
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};
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extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *);
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extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *);
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/**
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* sys_devices can be simplified a lot from regular devices, because they're
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* simply not as versatile.
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*/
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struct sys_device {
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u32 id;
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struct sysdev_class * cls;
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struct kobject kobj;
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};
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extern int sysdev_register(struct sys_device *);
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extern void sysdev_unregister(struct sys_device *);
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struct sysdev_attribute {
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struct attribute attr;
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ssize_t (*show)(struct sys_device *, struct sysdev_attribute *, char *);
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ssize_t (*store)(struct sys_device *, struct sysdev_attribute *,
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const char *, size_t);
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};
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#define _SYSDEV_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_ATTR(_name, _mode, _show, _store) \
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struct sysdev_attribute attr_##_name = \
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_SYSDEV_ATTR(_name, _mode, _show, _store);
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extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
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extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
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struct sysdev_ext_attribute {
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struct sysdev_attribute attr;
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void *var;
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};
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/*
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* Support for simple variable sysdev attributes.
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* The pointer to the variable is stored in a sysdev_ext_attribute
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*/
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/* Add more types as needed */
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extern ssize_t sysdev_show_ulong(struct sys_device *, struct sysdev_attribute *,
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char *);
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extern ssize_t sysdev_store_ulong(struct sys_device *,
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struct sysdev_attribute *, const char *, size_t);
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extern ssize_t sysdev_show_int(struct sys_device *, struct sysdev_attribute *,
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char *);
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extern ssize_t sysdev_store_int(struct sys_device *,
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struct sysdev_attribute *, const char *, size_t);
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#define _SYSDEV_ULONG_ATTR(_name, _mode, _var) \
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{ _SYSDEV_ATTR(_name, _mode, sysdev_show_ulong, sysdev_store_ulong), \
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&(_var) }
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#define SYSDEV_ULONG_ATTR(_name, _mode, _var) \
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struct sysdev_ext_attribute attr_##_name = \
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_SYSDEV_ULONG_ATTR(_name, _mode, _var);
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#define _SYSDEV_INT_ATTR(_name, _mode, _var) \
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{ _SYSDEV_ATTR(_name, _mode, sysdev_show_int, sysdev_store_int), \
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&(_var) }
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#define SYSDEV_INT_ATTR(_name, _mode, _var) \
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struct sysdev_ext_attribute attr_##_name = \
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_SYSDEV_INT_ATTR(_name, _mode, _var);
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#endif /* _SYSDEV_H_ */
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