1 files changed, 94 insertions, 0 deletions

diff --git a/include/linux/sysdev.h b/include/linux/sysdev.h
new file mode 100644
index 0000000000..635db1df65
--- /dev/null
+++ b/include/linux/sysdev.h
@@ -0,0 +1,94 @@
+/**
+ * System devices follow a slightly different driver model. 
+ * They don't need to do dynammic driver binding, can't be probed, 
+ * and don't reside on any type of peripheral bus. 
+ * So, we represent and treat them a little differently.
+ * 
+ * We still have a notion of a driver for a system device, because we still
+ * want to perform basic operations on these devices. 
+ *
+ * We also support auxillary drivers binding to devices of a certain class.
+ * 
+ * This allows configurable drivers to register themselves for devices of
+ * a certain type. And, it allows class definitions to reside in generic
+ * code while arch-specific code can register specific drivers.
+ *
+ * Auxillary drivers registered with a NULL cls are registered as drivers
+ * for all system devices, and get notification calls for each device. 
+ */
+
+
+#ifndef _SYSDEV_H_
+#define _SYSDEV_H_
+
+#include <linux/kobject.h>
+
+
+struct sys_device;
+
+struct sysdev_class {
+        struct list_head        drivers;
+
+        /* Default operations for these types of devices */
+        int     (*shutdown)(struct sys_device *);
+        int     (*suspend)(struct sys_device *, u32 state);
+        int     (*resume)(struct sys_device *);
+        struct kset             kset;
+};
+
+
+extern int sysdev_class_register(struct sysdev_class *);
+extern void sysdev_class_unregister(struct sysdev_class *);
+
+
+/**
+ * Auxillary system device drivers.
+ */
+
+struct sysdev_driver {
+        struct list_head        entry;
+        int     (*add)(struct sys_device *);
+        int     (*remove)(struct sys_device *);
+        int     (*shutdown)(struct sys_device *);
+        int     (*suspend)(struct sys_device *, u32 state);
+        int     (*resume)(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 *, char *);
+        ssize_t (*store)(struct sys_device *, const char *, size_t);
+};
+
+
+#define SYSDEV_ATTR(_name,_mode,_show,_store)           \
+struct sysdev_attribute attr_##_name = {                        \
+        .attr = {.name = __stringify(_name), .mode = _mode },   \
+        .show   = _show,                                        \
+        .store  = _store,                                       \
+};
+
+extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
+extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
+
+#endif /* _SYSDEV_H_ */