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