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Subject[PATCH] class core: export MAJOR/MINOR to the hotplug env
Date
From
ChangeSet 1.2039, 2005/03/09 09:32:38-08:00, kay.sievers@vrfy.org

[PATCH] class core: export MAJOR/MINOR to the hotplug env

Move the creation of the sysfs "dev" file of a class device into the
driver core. The struct class_device contains a dev_t value now. If set,
the driver core will create the "dev" file containing the major/minor
numbers automatically.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>


drivers/base/class.c | 39 +++++++++++++++++++++++++++++----------
include/linux/device.h | 1 +
2 files changed, 30 insertions(+), 10 deletions(-)

diff -Nru a/drivers/base/class.c b/drivers/base/class.c
--- a/drivers/base/class.c 2005-03-09 16:29:55 -08:00
+++ b/drivers/base/class.c 2005-03-09 16:29:55 -08:00
@@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>
+#include <linux/kdev_t.h>
#include "base.h"

#define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
@@ -298,9 +299,9 @@
int num_envp, char *buffer, int buffer_size)
{
struct class_device *class_dev = to_class_dev(kobj);
- int retval = 0;
int i = 0;
int length = 0;
+ int retval = 0;

pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);

@@ -313,26 +314,34 @@
&length, "PHYSDEVPATH=%s", path);
kfree(path);

- /* add bus name of physical device */
if (dev->bus)
add_hotplug_env_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"PHYSDEVBUS=%s", dev->bus->name);

- /* add driver name of physical device */
if (dev->driver)
add_hotplug_env_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"PHYSDEVDRIVER=%s", dev->driver->name);
-
- /* terminate, set to next free slot, shrink available space */
- envp[i] = NULL;
- envp = &envp[i];
- num_envp -= i;
- buffer = &buffer[length];
- buffer_size -= length;
}

+ if (MAJOR(class_dev->devt)) {
+ add_hotplug_env_var(envp, num_envp, &i,
+ buffer, buffer_size, &length,
+ "MAJOR=%u", MAJOR(class_dev->devt));
+
+ add_hotplug_env_var(envp, num_envp, &i,
+ buffer, buffer_size, &length,
+ "MINOR=%u", MINOR(class_dev->devt));
+ }
+
+ /* terminate, set to next free slot, shrink available space */
+ envp[i] = NULL;
+ envp = &envp[i];
+ num_envp -= i;
+ buffer = &buffer[length];
+ buffer_size -= length;
+
if (class_dev->class->hotplug) {
/* have the bus specific function add its stuff */
retval = class_dev->class->hotplug (class_dev, envp, num_envp,
@@ -388,6 +397,12 @@
}
}

+static ssize_t show_dev(struct class_device *class_dev, char *buf)
+{
+ return print_dev_t(buf, class_dev->devt);
+}
+static CLASS_DEVICE_ATTR(dev, S_IRUGO, show_dev, NULL);
+
void class_device_initialize(struct class_device *class_dev)
{
kobj_set_kset_s(class_dev, class_obj_subsys);
@@ -432,6 +447,10 @@
class_intf->add(class_dev);
up_write(&parent->subsys.rwsem);
}
+
+ if (MAJOR(class_dev->devt))
+ class_device_create_file(class_dev, &class_device_attr_dev);
+
class_device_add_attrs(class_dev);
class_device_dev_link(class_dev);
class_device_driver_link(class_dev);
diff -Nru a/include/linux/device.h b/include/linux/device.h
--- a/include/linux/device.h 2005-03-09 16:29:55 -08:00
+++ b/include/linux/device.h 2005-03-09 16:29:55 -08:00
@@ -184,6 +184,7 @@

struct kobject kobj;
struct class * class; /* required */
+ dev_t devt; /* dev_t, creates the sysfs "dev" */
struct device * dev; /* not necessary, but nice to have */
void * class_data; /* class-specific data */

-
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