[MTD] replace kmalloc+memset with kzalloc
[linux-2.6.git] / drivers / mtd / mtdblock_ro.c
1 /*
2  * $Id: mtdblock_ro.c,v 1.19 2004/11/16 18:28:59 dwmw2 Exp $
3  *
4  * (C) 2003 David Woodhouse <dwmw2@infradead.org>
5  *
6  * Simple read-only (writable only for RAM) mtdblock driver
7  */
8
9 #include <linux/init.h>
10 #include <linux/slab.h>
11 #include <linux/mtd/mtd.h>
12 #include <linux/mtd/blktrans.h>
13
14 static int mtdblock_readsect(struct mtd_blktrans_dev *dev,
15                               unsigned long block, char *buf)
16 {
17         size_t retlen;
18
19         if (dev->mtd->read(dev->mtd, (block * 512), 512, &retlen, buf))
20                 return 1;
21         return 0;
22 }
23
24 static int mtdblock_writesect(struct mtd_blktrans_dev *dev,
25                               unsigned long block, char *buf)
26 {
27         size_t retlen;
28
29         if (dev->mtd->write(dev->mtd, (block * 512), 512, &retlen, buf))
30                 return 1;
31         return 0;
32 }
33
34 static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
35 {
36         struct mtd_blktrans_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
37
38         if (!dev)
39                 return;
40
41         dev->mtd = mtd;
42         dev->devnum = mtd->index;
43
44         dev->size = mtd->size >> 9;
45         dev->tr = tr;
46         dev->readonly = 1;
47
48         add_mtd_blktrans_dev(dev);
49 }
50
51 static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev)
52 {
53         del_mtd_blktrans_dev(dev);
54         kfree(dev);
55 }
56
57 static struct mtd_blktrans_ops mtdblock_tr = {
58         .name           = "mtdblock",
59         .major          = 31,
60         .part_bits      = 0,
61         .blksize        = 512,
62         .readsect       = mtdblock_readsect,
63         .writesect      = mtdblock_writesect,
64         .add_mtd        = mtdblock_add_mtd,
65         .remove_dev     = mtdblock_remove_dev,
66         .owner          = THIS_MODULE,
67 };
68
69 static int __init mtdblock_init(void)
70 {
71         return register_mtd_blktrans(&mtdblock_tr);
72 }
73
74 static void __exit mtdblock_exit(void)
75 {
76         deregister_mtd_blktrans(&mtdblock_tr);
77 }
78
79 module_init(mtdblock_init);
80 module_exit(mtdblock_exit);
81
82 MODULE_LICENSE("GPL");
83 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
84 MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices");