drivers/mtd/mtdchar.c

22 #include <linux/mtd/mtd.h>
23 #include <linux/mtd/partitions.h>
24 #include <linux/mtd/map.h>
31  * Data structure to hold the pointer to the mtd device as well
35 	struct mtd_info *mtd;
42 	return fixed_size_llseek(file, offset, orig, mfi->mtd->size);
50 	struct mtd_info *mtd;
59 	mtd = get_mtd_device(NULL, devnum);
61 	if (IS_ERR(mtd))
62 		return PTR_ERR(mtd);
64 	if (mtd->type == MTD_ABSENT) {
70 	if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
80 	mfi->mtd = mtd;
85 	put_mtd_device(mtd);
94 	struct mtd_info *mtd = mfi->mtd;
100 		mtd_sync(mtd);
102 	put_mtd_device(mtd);
131 	struct mtd_info *mtd = mfi->mtd;
141 	if (*ppos + count > mtd->size) {
142 		if (*ppos < mtd->size)
143 			count = mtd->size - *ppos;
151 	kbuf = mtd_kmalloc_up_to(mtd, &size);
160 			ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
164 			ret = mtd_read_user_prot_reg(mtd, *ppos, len,
176 			ret = mtd_read_oob(mtd, *ppos, &ops);
181 			ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
221 	struct mtd_info *mtd = mfi->mtd;
231 	if (*ppos >= mtd->size)
234 	if (*ppos + count > mtd->size)
235 		count = mtd->size - *ppos;
240 	kbuf = mtd_kmalloc_up_to(mtd, &size);
257 			ret = mtd_write_user_prot_reg(mtd, *ppos, len,
271 			ret = mtd_write_oob(mtd, *ppos, &ops);
277 			ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
312 	struct mtd_info *mtd = mfi->mtd;
317 		if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
324 		if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
340 static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
344 	struct mtd_info *master  = mtd_get_master(mtd);
357 	ops.ooboffs = start & (mtd->writesize - 1);
362 	if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
369 	start &= ~((uint64_t)mtd->writesize - 1);
370 	ret = mtd_write_oob(mtd, start, &ops);
382 static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
394 	ops.ooboffs = start & (mtd->writesize - 1);
399 	if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
406 	start &= ~((uint64_t)mtd->writesize - 1);
407 	ret = mtd_read_oob(mtd, start, &ops);
443 static int shrink_ecclayout(struct mtd_info *mtd,
449 	if (!mtd || !to)
458 		ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
475 		ret = mtd_ooblayout_free(mtd, i, &oobregion);
491 static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
496 	if (!mtd || !to)
505 		ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
524 		ret = mtd_ooblayout_free(mtd, i, &oobregion);
541 static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
555 		/* Only master mtd device must be used to add partitions */
556 		if (mtd_is_partition(mtd))
562 		return mtd_add_partition(mtd, p.devname, p.start, p.length);
569 		return mtd_del_partition(mtd, p.pno);
576 static void adjust_oob_length(struct mtd_info *mtd, uint64_t start,
585 	start_page = mtd_div_by_ws(start, mtd);
586 	end_page = mtd_div_by_ws(start + ops->len - 1, mtd);
587 	oob_per_page = mtd_oobavail(mtd, ops);
594 mtdchar_write_ioctl(struct mtd_info *mtd, struct mtd_write_req __user *argp)
596 	struct mtd_info *master = mtd_get_master(mtd);
621 	if (req.start + req.len > mtd->size)
624 	datbuf_len = min_t(size_t, req.len, mtd->erasesize);
631 	oobbuf_len = min_t(size_t, req.ooblen, mtd->erasesize);
655 		if (ops.len == mtd->erasesize)
656 			ops.len -= mtd_mod_by_ws(req.start + ops.len, mtd);
665 		adjust_oob_length(mtd, req.start, &ops);
673 		ret = mtd_write_oob(mtd, req.start, &ops);
692 mtdchar_read_ioctl(struct mtd_info *mtd, struct mtd_read_req __user *argp)
694 	struct mtd_info *master = mtd_get_master(mtd);
727 	if (req.start + req.len > mtd->size) {
732 	datbuf_len = min_t(size_t, req.len, mtd->erasesize);
741 	oobbuf_len = min_t(size_t, req.ooblen, mtd->erasesize);
768 		if (ops.len == mtd->erasesize)
769 			ops.len -= mtd_mod_by_ws(req.start + ops.len, mtd);
771 		ret = mtd_read_oob(mtd, (loff_t)req.start, &ops);
825 	struct mtd_info *mtd = mfi->mtd;
826 	struct mtd_info *master = mtd_get_master(mtd);
879 		if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
892 		if (ur_idx >= mtd->numeraseregions)
895 		kr = &(mtd->eraseregions[ur_idx]);
907 		info.type	= mtd->type;
908 		info.flags	= mtd->flags;
909 		info.size	= mtd->size;
910 		info.erasesize	= mtd->erasesize;
911 		info.writesize	= mtd->writesize;
912 		info.oobsize	= mtd->oobsize;
950 			ret = mtd_erase(mtd, erase);
965 			ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
979 			ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
992 			ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
1006 			ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
1014 		ret = mtdchar_write_ioctl(mtd,
1021 		ret = mtdchar_read_ioctl(mtd,
1033 		ret = mtd_lock(mtd, einfo.start, einfo.length);
1044 		ret = mtd_unlock(mtd, einfo.start, einfo.length);
1055 		ret = mtd_is_locked(mtd, einfo.start, einfo.length);
1067 		ret = get_oobinfo(mtd, &oi);
1082 		return mtd_block_isbad(mtd, offs);
1091 		return mtd_block_markbad(mtd, offs);
1117 			ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
1120 			ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
1149 			ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
1151 			ret = mtd_erase_user_prot_reg(mtd, oinfo.start, oinfo.length);
1167 		shrink_ecclayout(mtd, usrlay);
1177 		if (copy_to_user(argp, &mtd->ecc_stats,
1194 			if (!mtd_has_oob(mtd))
1216 			ret = mtdchar_blkpg_ioctl(mtd, &a);
1234 	struct mtd_info *mtd = mfi->mtd;
1235 	struct mtd_info *master = mtd_get_master(mtd);
1260 	struct mtd_info *mtd = mfi->mtd;
1261 	struct mtd_info *master = mtd_get_master(mtd);
1281 			ret = mtdchar_writeoob(file, mtd, buf.start,
1296 			ret = mtdchar_readoob(file, mtd, buf.start,
1320 		ret = mtdchar_blkpg_ioctl(mtd, &a);
1348 	struct mtd_info *mtd = mfi->mtd;
1355 	if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1359 	if (offset > mtd->size - len)
1362 	ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1370 	return mtd_mmap_capabilities(mfi->mtd);
1381 	struct mtd_info *mtd = mfi->mtd;
1382 	struct map_info *map = mtd->priv;
1385 	   and that mtd->priv is a valid struct map_info.  It should be
1388 	if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1424 				   "mtd", &mtd_fops);
1436 	__unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");