| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * $Id: blktrans.h,v 1.5 2003/06/23 12:00:08 dwmw2 Exp $ |
| 3 | * |
| 4 | * (C) 2003 David Woodhouse <dwmw2@infradead.org> |
| 5 | * |
| 6 | * Interface to Linux block layer for MTD 'translation layers'. |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #ifndef __MTD_TRANS_H__ |
| 11 | #define __MTD_TRANS_H__ |
| 12 | |
| 13 | #include <asm/semaphore.h> |
| 14 | |
| 15 | struct hd_geometry; |
| 16 | struct mtd_info; |
| 17 | struct mtd_blktrans_ops; |
| 18 | struct file; |
| 19 | struct inode; |
| 20 | |
| 21 | struct mtd_blktrans_dev { |
| 22 | struct mtd_blktrans_ops *tr; |
| 23 | struct list_head list; |
| 24 | struct mtd_info *mtd; |
| 25 | struct semaphore sem; |
| 26 | int devnum; |
| 27 | int blksize; |
| 28 | unsigned long size; |
| 29 | int readonly; |
| 30 | void *blkcore_priv; /* gendisk in 2.5, devfs_handle in 2.4 */ |
| 31 | }; |
| 32 | |
| 33 | struct blkcore_priv; /* Differs for 2.4 and 2.5 kernels; private */ |
| 34 | |
| 35 | struct mtd_blktrans_ops { |
| 36 | char *name; |
| 37 | int major; |
| 38 | int part_bits; |
| 39 | |
| 40 | /* Access functions */ |
| 41 | int (*readsect)(struct mtd_blktrans_dev *dev, |
| 42 | unsigned long block, char *buffer); |
| 43 | int (*writesect)(struct mtd_blktrans_dev *dev, |
| 44 | unsigned long block, char *buffer); |
| 45 | |
| 46 | /* Block layer ioctls */ |
| 47 | int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo); |
| 48 | int (*flush)(struct mtd_blktrans_dev *dev); |
| 49 | |
| 50 | /* Called with mtd_table_mutex held; no race with add/remove */ |
| 51 | int (*open)(struct mtd_blktrans_dev *dev); |
| 52 | int (*release)(struct mtd_blktrans_dev *dev); |
| 53 | |
| 54 | /* Called on {de,}registration and on subsequent addition/removal |
| 55 | of devices, with mtd_table_mutex held. */ |
| 56 | void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd); |
| 57 | void (*remove_dev)(struct mtd_blktrans_dev *dev); |
| 58 | |
| 59 | struct list_head devs; |
| 60 | struct list_head list; |
| 61 | struct module *owner; |
| 62 | |
| 63 | struct mtd_blkcore_priv *blkcore_priv; |
| 64 | }; |
| 65 | |
| 66 | extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr); |
| 67 | extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr); |
| 68 | extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); |
| 69 | extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); |
| 70 | |
| 71 | |
| 72 | #endif /* __MTD_TRANS_H__ */ |