Re: udev and raw devices?

[Greg KH <greg@kroah.com>]

On Fri, May 21, 2004 at 09:11:40PM +0200, Thomas Winischhofer wrote:
> 
> Is that supported? If so, how...?

Here's the necessary kernel patch to do this.  SuSE has it in their
kernels, and I need to submit it to the main kernel tree one of these
days...

Hope this helps,

greg k-h


--- a/drivers/char/raw.c	2004-05-21 12:33:11 -07:00
+++ b/drivers/char/raw.c	2004-05-21 12:33:11 -07:00
@@ -18,6 +18,7 @@
 #include <linux/capability.h>
 #include <linux/uio.h>
 #include <linux/cdev.h>
+#include <linux/device.h>
 
 #include <asm/uaccess.h>
 
@@ -26,6 +27,7 @@
 	int inuse;
 };
 
+static struct class_simple *raw_class;
 static struct raw_device_data raw_devices[MAX_RAW_MINORS];
 static DECLARE_MUTEX(raw_mutex);
 static struct file_operations raw_ctl_fops;	     /* forward declaration */
@@ -123,6 +125,13 @@
 	return ioctl_by_bdev(bdev, command, arg);
 }
 
+static void bind_device(struct raw_config_request rq)
+{
+	class_simple_device_remove(MKDEV(RAW_MAJOR, rq.raw_minor));
+	class_simple_device_add(raw_class, MKDEV(RAW_MAJOR, rq.raw_minor),
+				      NULL, "raw%d", rq.raw_minor);
+}
+
 /*
  * Deal with ioctls against the raw-device control interface, to bind
  * and unbind other raw devices.
@@ -191,12 +200,15 @@
 			if (rq.block_major = 0 && rq.block_minor = 0) {
 				/* unbind */
 				rawdev->binding = NULL;
+				class_simple_device_remove(MKDEV(RAW_MAJOR, rq.raw_minor));
 			} else {
 				rawdev->binding = bdget(dev);
 				if (rawdev->binding = NULL)
 					err = -ENOMEM;
-				else
+				else {
 					__module_get(THIS_MODULE);
+					bind_device(rq);
+					}
 			}
 			up(&raw_mutex);
 		} else {
@@ -281,6 +293,15 @@
 		goto error;
 	}
 
+	raw_class = class_simple_create(THIS_MODULE, "raw");
+	if (IS_ERR(raw_class)) {
+		printk(KERN_ERR "Error creating raw class.\n");
+		cdev_del(&raw_cdev);
+		unregister_chrdev_region(dev, MAX_RAW_MINORS);
+		goto error;
+	}
+	class_simple_device_add(raw_class, MKDEV(RAW_MAJOR, 0), NULL, "rawctl");
+
 	devfs_mk_cdev(MKDEV(RAW_MAJOR, 0),
 		      S_IFCHR | S_IRUGO | S_IWUGO,
 		      "raw/rawctl");
@@ -303,6 +324,8 @@
 		devfs_remove("raw/raw%d", i);
 	devfs_remove("raw/rawctl");
 	devfs_remove("raw");
+	class_simple_device_remove(MKDEV(RAW_MAJOR, 0));
+	class_simple_destroy(raw_class);
 	cdev_del(&raw_cdev);
 	unregister_chrdev_region(MKDEV(RAW_MAJOR, 0), MAX_RAW_MINORS);
 }


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