[PATCH] Driver core: allow struct device to have a dev_t

This is the first step in moving class_device to being replaced by
struct device.  It allows struct device to export a dev_t and makes it
easy to dynamically create and destroy struct device as long as they are
associated with a specific class.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/linux/device.h b/include/linux/device.h
index ade10dd6b77..b473f427891 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -142,6 +142,7 @@ struct class {
 
         struct subsystem        subsys;
         struct list_head        children;
+        struct list_head        devices;
         struct list_head        interfaces;
         struct semaphore        sem;    /* locks both the children and interfaces lists */
 
@@ -305,6 +306,7 @@ struct device {
         struct kobject kobj;
         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
         struct device_attribute uevent_attr;
+        struct device_attribute *devt_attr;
 
         struct semaphore        sem;    /* semaphore to synchronize calls to
                                          * its driver.
@@ -332,6 +334,11 @@ struct device {
         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
                                              override */
 
+        /* class_device migration path */
+        struct list_head        node;
+        struct class            *class;         /* optional*/
+        dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
+
         void    (*release)(struct device * dev);
 };
 
@@ -373,6 +380,13 @@ extern int  device_attach(struct device * dev);
 extern void driver_attach(struct device_driver * drv);
 extern void device_reprobe(struct device *dev);
 
+/*
+ * Easy functions for dynamically creating devices on the fly
+ */
+extern struct device *device_create(struct class *cls, struct device *parent,
+                                    dev_t devt, char *fmt, ...)
+                                    __attribute__((format(printf,4,5)));
+extern void device_destroy(struct class *cls, dev_t devt);
 
 /*
  * Platform "fixup" functions - allow the platform to have their say