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mtd: add an ioctl to query the lock status of a flash sector 

This patchs adds a way for user space programs to find out whether a
flash sector is locked. An optional driver method in the mtd_info struct
provides the information.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Richard Cochran 2010-06-14 18:10:33 +02:00 committed by David Woodhouse
parent 1df620637f
commit 9938424f0c
5 changed files with 36 additions and 0 deletions
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10
drivers/mtd/chips/cfi_cmdset_0001.c
View File

@ -63,6 +63,8 @@ static int cfi_intelext_erase_varsize(struct mtd_info *, struct erase_info *);
static void cfi_intelext_sync (struct mtd_info *);
static int cfi_intelext_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
static int cfi_intelext_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
static int cfi_intelext_is_locked(struct mtd_info *mtd, loff_t ofs,
uint64_t len);
#ifdef CONFIG_MTD_OTP
static int cfi_intelext_read_fact_prot_reg (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int cfi_intelext_read_user_prot_reg (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
@ -448,6 +450,7 @@ struct mtd_info *cfi_cmdset_0001(struct map_info *map, int primary)
mtd->sync = cfi_intelext_sync;
mtd->lock = cfi_intelext_lock;
mtd->unlock = cfi_intelext_unlock;
mtd->is_locked = cfi_intelext_is_locked;
mtd->suspend = cfi_intelext_suspend;
mtd->resume = cfi_intelext_resume;
mtd->flags = MTD_CAP_NORFLASH;
@ -2139,6 +2142,13 @@ static int cfi_intelext_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
return ret;
}
static int cfi_intelext_is_locked(struct mtd_info *mtd, loff_t ofs,
uint64_t len)
{
return cfi_varsize_frob(mtd, do_getlockstatus_oneblock,
ofs, len, NULL) ? 1 : 0;
}
#ifdef CONFIG_MTD_OTP
typedef int (*otp_op_t)(struct map_info *map, struct flchip *chip,

14
drivers/mtd/mtdchar.c
View File

@ -676,6 +676,20 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
break;
}
case MEMISLOCKED:
{
struct erase_info_user einfo;
if (copy_from_user(&einfo, argp, sizeof(einfo)))
return -EFAULT;
if (!mtd->is_locked)
ret = -EOPNOTSUPP;
else
ret = mtd->is_locked(mtd, einfo.start, einfo.length);
break;
}
/* Legacy interface */
case MEMGETOOBSEL:
{

10
drivers/mtd/mtdpart.c
View File

@ -264,6 +264,14 @@ static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
return part->master->unlock(part->master, ofs + part->offset, len);
}
static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_part *part = PART(mtd);
if ((len + ofs) > mtd->size)
return -EINVAL;
return part->master->is_locked(part->master, ofs + part->offset, len);
}
static void part_sync(struct mtd_info *mtd)
{
struct mtd_part *part = PART(mtd);
@ -402,6 +410,8 @@ static struct mtd_part *add_one_partition(struct mtd_info *master,
slave->mtd.lock = part_lock;
if (master->unlock)
slave->mtd.unlock = part_unlock;
if (master->is_locked)
slave->mtd.is_locked = part_is_locked;
if (master->block_isbad)
slave->mtd.block_isbad = part_block_isbad;
if (master->block_markbad)

1
include/linux/mtd/mtd.h
View File

@ -216,6 +216,7 @@ struct mtd_info {
/* Chip-supported device locking */
int (*lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
int (*unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
int (*is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
/* Power Management functions */
int (*suspend) (struct mtd_info *mtd);

1
include/mtd/mtd-abi.h
View File

@ -110,6 +110,7 @@ struct otp_info {
#define MEMERASE64 _IOW('M', 20, struct erase_info_user64)
#define MEMWRITEOOB64 _IOWR('M', 21, struct mtd_oob_buf64)
#define MEMREADOOB64 _IOWR('M', 22, struct mtd_oob_buf64)
#define MEMISLOCKED _IOR('M', 23, struct erase_info_user)
/*
* Obsolete legacy interface. Keep it in order not to break userspace