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