[MTD] mtdchar.c: Replace DEVFS by udev

Switch from DEVFS to udev for dynamic creation of device nodes for mtd
char devices.

Creates a new LDM class "mtd" with writeable and read-only devices
registered for each mtdchar device.

From: Paolo Galtieri <pgaltieri@mvista.com>
Signed-off-by: Todd Poynor <tpoynor@mvista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 24 insertions, 28 deletions

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index da3f1a8f756e..b606f811eeb4 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -1,5 +1,5 @@
 /*
- * $Id: mtdchar.c,v 1.70 2005/04/01 15:36:11 nico Exp $
+ * $Id: mtdchar.c,v 1.72 2005/06/30 00:23:24 tpoynor Exp $
  *
  * Character-device access to raw MTD devices.
  *
@@ -15,27 +15,30 @@
 #include <linux/fs.h>
 #include <asm/uaccess.h>
 
-#ifdef CONFIG_DEVFS_FS
-#include <linux/devfs_fs_kernel.h>
+#include <linux/device.h>
+
+static struct class *mtd_class;
 
 static void mtd_notify_add(struct mtd_info* mtd)
 {
         if (!mtd)
                 return;
 
-        devfs_mk_cdev(MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
-                      S_IFCHR | S_IRUGO | S_IWUGO, "mtd/%d", mtd->index);
-                
-        devfs_mk_cdev(MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
-                      S_IFCHR | S_IRUGO, "mtd/%dro", mtd->index);
+        class_device_create(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
+                            NULL, "mtd%d", mtd->index);
+        
+        class_device_create(mtd_class, 
+                            MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
+                            NULL, "mtd%dro", mtd->index);
 }
 
 static void mtd_notify_remove(struct mtd_info* mtd)
 {
         if (!mtd)
                 return;
-        devfs_remove("mtd/%d", mtd->index);
-        devfs_remove("mtd/%dro", mtd->index);
+
+        class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
+        class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
 }
 
 static struct mtd_notifier notifier = {
@@ -43,22 +46,6 @@ static struct mtd_notifier notifier = {
         .remove = mtd_notify_remove,
 };
 
-static inline void mtdchar_devfs_init(void)
-{
-        devfs_mk_dir("mtd");
-        register_mtd_user(&notifier);
-}
-
-static inline void mtdchar_devfs_exit(void)
-{
-        unregister_mtd_user(&notifier);
-        devfs_remove("mtd");
-}
-#else /* !DEVFS */
-#define mtdchar_devfs_init() do { } while(0)
-#define mtdchar_devfs_exit() do { } while(0)
-#endif
-
 /*
  * We use file->private_data to store a pointer to the MTDdevice.
  * Since alighment is at least 32 bits, we have 2 bits free for OTP
@@ -657,13 +644,22 @@ static int __init init_mtdchar(void)
                 return -EAGAIN;
         }
 
-        mtdchar_devfs_init();
+        mtd_class = class_create(THIS_MODULE, "mtd");
+
+        if (IS_ERR(mtd_class)) {
+                printk(KERN_ERR "Error creating mtd class.\n");
+                unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
+                return 1;
+        }
+
+        register_mtd_user(&notifier);
         return 0;
 }
 
 static void __exit cleanup_mtdchar(void)
 {
-        mtdchar_devfs_exit();
+        unregister_mtd_user(&notifier);
+        class_destroy(mtd_class);
         unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 }