/*
- * $Id: mtdchar.c,v 1.68 2005/02/08 19:12:50 nico Exp $
- *
* Character-device access to raw MTD devices.
*
*/
-#include <linux/config.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/err.h>
+#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/compatmac.h>
#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <asm/uaccess.h>
-
-#ifdef CONFIG_DEVFS_FS
-#include <linux/devfs_fs_kernel.h>
-
-static void mtd_notify_add(struct mtd_info* mtd)
-{
- if (!mtd)
- return;
-
- devfs_mk_cdev(MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
- S_IFCHR | S_IRUGO | S_IWUGO, "mtd/%d", mtd->index);
-
- devfs_mk_cdev(MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
- S_IFCHR | S_IRUGO, "mtd/%dro", mtd->index);
-}
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/backing-dev.h>
-static void mtd_notify_remove(struct mtd_info* mtd)
-{
- if (!mtd)
- return;
- devfs_remove("mtd/%d", mtd->index);
- devfs_remove("mtd/%dro", mtd->index);
-}
-
-static struct mtd_notifier notifier = {
- .add = mtd_notify_add,
- .remove = mtd_notify_remove,
-};
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/compatmac.h>
-static inline void mtdchar_devfs_init(void)
-{
- devfs_mk_dir("mtd");
- register_mtd_user(¬ifier);
-}
+#include <asm/uaccess.h>
-static inline void mtdchar_devfs_exit(void)
-{
- unregister_mtd_user(¬ifier);
- devfs_remove("mtd");
-}
-#else /* !DEVFS */
-#define mtdchar_devfs_init() do { } while(0)
-#define mtdchar_devfs_exit() do { } while(0)
-#endif
/*
- * We use file->private_data to store a pointer to the MTDdevice.
- * Since alighment is at least 32 bits, we have 2 bits free for OTP
- * modes as well.
+ * Data structure to hold the pointer to the mtd device as well
+ * as mode information ofr various use cases.
*/
-
-#define TO_MTD(file) (struct mtd_info *)((long)((file)->private_data) & ~3L)
-
-#define MTD_MODE_OTP_FACT 1
-#define MTD_MODE_OTP_USER 2
-#define MTD_MODE(file) ((long)((file)->private_data) & 3)
-
-#define SET_MTD_MODE(file, mode) \
- do { long __p = (long)((file)->private_data); \
- (file)->private_data = (void *)((__p & ~3L) | mode); } while (0)
+struct mtd_file_info {
+ struct mtd_info *mtd;
+ enum mtd_file_modes mode;
+};
static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
{
- struct mtd_info *mtd = TO_MTD(file);
+ struct mtd_file_info *mfi = file->private_data;
+ struct mtd_info *mtd = mfi->mtd;
switch (orig) {
- case 0:
- /* SEEK_SET */
- file->f_pos = offset;
+ case SEEK_SET:
break;
- case 1:
- /* SEEK_CUR */
- file->f_pos += offset;
+ case SEEK_CUR:
+ offset += file->f_pos;
break;
- case 2:
- /* SEEK_END */
- file->f_pos =mtd->size + offset;
+ case SEEK_END:
+ offset += mtd->size;
break;
default:
return -EINVAL;
}
- if (file->f_pos < 0)
- file->f_pos = 0;
- else if (file->f_pos >= mtd->size)
- file->f_pos = mtd->size - 1;
+ if (offset >= 0 && offset <= mtd->size)
+ return file->f_pos = offset;
- return file->f_pos;
+ return -EINVAL;
}
{
int minor = iminor(inode);
int devnum = minor >> 1;
+ int ret = 0;
struct mtd_info *mtd;
+ struct mtd_file_info *mfi;
DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
return -ENODEV;
/* You can't open the RO devices RW */
- if ((file->f_mode & 2) && (minor & 1))
+ if ((file->f_mode & FMODE_WRITE) && (minor & 1))
return -EACCES;
+ lock_kernel();
mtd = get_mtd_device(NULL, devnum);
-
- if (!mtd)
- return -ENODEV;
-
- if (MTD_ABSENT == mtd->type) {
+
+ if (IS_ERR(mtd)) {
+ ret = PTR_ERR(mtd);
+ goto out;
+ }
+
+ if (mtd->type == MTD_ABSENT) {
put_mtd_device(mtd);
- return -ENODEV;
+ ret = -ENODEV;
+ goto out;
}
- file->private_data = mtd;
-
+ if (mtd->backing_dev_info)
+ file->f_mapping->backing_dev_info = mtd->backing_dev_info;
+
/* You can't open it RW if it's not a writeable device */
- if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
+ if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
put_mtd_device(mtd);
- return -EACCES;
+ ret = -EACCES;
+ goto out;
}
-
- return 0;
+
+ mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
+ if (!mfi) {
+ put_mtd_device(mtd);
+ ret = -ENOMEM;
+ goto out;
+ }
+ mfi->mtd = mtd;
+ file->private_data = mfi;
+
+out:
+ unlock_kernel();
+ return ret;
} /* mtd_open */
/*====================================================================*/
static int mtd_close(struct inode *inode, struct file *file)
{
- struct mtd_info *mtd;
+ struct mtd_file_info *mfi = file->private_data;
+ struct mtd_info *mtd = mfi->mtd;
DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
- mtd = TO_MTD(file);
-
- if (mtd->sync)
+ /* Only sync if opened RW */
+ if ((file->f_mode & FMODE_WRITE) && mtd->sync)
mtd->sync(mtd);
-
+
put_mtd_device(mtd);
+ file->private_data = NULL;
+ kfree(mfi);
return 0;
} /* mtd_close */
static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
{
- struct mtd_info *mtd = TO_MTD(file);
+ struct mtd_file_info *mfi = file->private_data;
+ struct mtd_info *mtd = mfi->mtd;
size_t retlen=0;
size_t total_retlen=0;
int ret=0;
int len;
char *kbuf;
-
+
DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
if (*ppos + count > mtd->size)
if (!count)
return 0;
-
+
/* FIXME: Use kiovec in 2.5 to lock down the user's buffers
and pass them directly to the MTD functions */
+
+ if (count > MAX_KMALLOC_SIZE)
+ kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
+ else
+ kbuf=kmalloc(count, GFP_KERNEL);
+
+ if (!kbuf)
+ return -ENOMEM;
+
while (count) {
- if (count > MAX_KMALLOC_SIZE)
+
+ if (count > MAX_KMALLOC_SIZE)
len = MAX_KMALLOC_SIZE;
else
len = count;
- kbuf=kmalloc(len,GFP_KERNEL);
- if (!kbuf)
- return -ENOMEM;
-
- switch (MTD_MODE(file)) {
- case MTD_MODE_OTP_FACT:
+ switch (mfi->mode) {
+ case MTD_MODE_OTP_FACTORY:
ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
break;
case MTD_MODE_OTP_USER:
ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
break;
+ case MTD_MODE_RAW:
+ {
+ struct mtd_oob_ops ops;
+
+ ops.mode = MTD_OOB_RAW;
+ ops.datbuf = kbuf;
+ ops.oobbuf = NULL;
+ ops.len = len;
+
+ ret = mtd->read_oob(mtd, *ppos, &ops);
+ retlen = ops.retlen;
+ break;
+ }
default:
- ret = MTD_READ(mtd, *ppos, len, &retlen, kbuf);
+ ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
}
/* Nand returns -EBADMSG on ecc errors, but it returns
* the data. For our userspace tools it is important
- * to dump areas with ecc errors !
+ * to dump areas with ecc errors !
+ * For kernel internal usage it also might return -EUCLEAN
+ * to signal the caller that a bitflip has occured and has
+ * been corrected by the ECC algorithm.
* Userspace software which accesses NAND this way
* must be aware of the fact that it deals with NAND
*/
- if (!ret || (ret == -EBADMSG)) {
+ if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
*ppos += retlen;
if (copy_to_user(buf, kbuf, retlen)) {
- kfree(kbuf);
+ kfree(kbuf);
return -EFAULT;
}
else
kfree(kbuf);
return ret;
}
-
- kfree(kbuf);
+
}
+ kfree(kbuf);
return total_retlen;
} /* mtd_read */
static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
{
- struct mtd_info *mtd = TO_MTD(file);
+ struct mtd_file_info *mfi = file->private_data;
+ struct mtd_info *mtd = mfi->mtd;
char *kbuf;
size_t retlen;
size_t total_retlen=0;
int len;
DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
-
+
if (*ppos == mtd->size)
return -ENOSPC;
-
+
if (*ppos + count > mtd->size)
count = mtd->size - *ppos;
if (!count)
return 0;
+ if (count > MAX_KMALLOC_SIZE)
+ kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
+ else
+ kbuf=kmalloc(count, GFP_KERNEL);
+
+ if (!kbuf)
+ return -ENOMEM;
+
while (count) {
- if (count > MAX_KMALLOC_SIZE)
+
+ if (count > MAX_KMALLOC_SIZE)
len = MAX_KMALLOC_SIZE;
else
len = count;
- kbuf=kmalloc(len,GFP_KERNEL);
- if (!kbuf) {
- printk("kmalloc is null\n");
- return -ENOMEM;
- }
-
if (copy_from_user(kbuf, buf, len)) {
kfree(kbuf);
return -EFAULT;
}
-
- switch (MTD_MODE(file)) {
- case MTD_MODE_OTP_FACT:
+
+ switch (mfi->mode) {
+ case MTD_MODE_OTP_FACTORY:
ret = -EROFS;
break;
case MTD_MODE_OTP_USER:
}
ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
break;
+
+ case MTD_MODE_RAW:
+ {
+ struct mtd_oob_ops ops;
+
+ ops.mode = MTD_OOB_RAW;
+ ops.datbuf = kbuf;
+ ops.oobbuf = NULL;
+ ops.len = len;
+
+ ret = mtd->write_oob(mtd, *ppos, &ops);
+ retlen = ops.retlen;
+ break;
+ }
+
default:
ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
}
kfree(kbuf);
return ret;
}
-
- kfree(kbuf);
}
+ kfree(kbuf);
return total_retlen;
} /* mtd_write */
wake_up((wait_queue_head_t *)instr->priv);
}
+#ifdef CONFIG_HAVE_MTD_OTP
+static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
+{
+ struct mtd_info *mtd = mfi->mtd;
+ int ret = 0;
+
+ switch (mode) {
+ case MTD_OTP_FACTORY:
+ if (!mtd->read_fact_prot_reg)
+ ret = -EOPNOTSUPP;
+ else
+ mfi->mode = MTD_MODE_OTP_FACTORY;
+ break;
+ case MTD_OTP_USER:
+ if (!mtd->read_fact_prot_reg)
+ ret = -EOPNOTSUPP;
+ else
+ mfi->mode = MTD_MODE_OTP_USER;
+ break;
+ default:
+ ret = -EINVAL;
+ case MTD_OTP_OFF:
+ break;
+ }
+ return ret;
+}
+#else
+# define otp_select_filemode(f,m) -EOPNOTSUPP
+#endif
+
static int mtd_ioctl(struct inode *inode, struct file *file,
u_int cmd, u_long arg)
{
- struct mtd_info *mtd = TO_MTD(file);
+ struct mtd_file_info *mfi = file->private_data;
+ struct mtd_info *mtd = mfi->mtd;
void __user *argp = (void __user *)arg;
int ret = 0;
u_long size;
-
+ struct mtd_info_user info;
+
DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
if (!access_ok(VERIFY_WRITE, argp, size))
return -EFAULT;
}
-
+
switch (cmd) {
case MEMGETREGIONCOUNT:
if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
case MEMGETREGIONINFO:
{
- struct region_info_user ur;
+ uint32_t ur_idx;
+ struct mtd_erase_region_info *kr;
+ struct region_info_user *ur = (struct region_info_user *) argp;
- if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
+ if (get_user(ur_idx, &(ur->regionindex)))
return -EFAULT;
- if (ur.regionindex >= mtd->numeraseregions)
- return -EINVAL;
- if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
- sizeof(struct mtd_erase_region_info)))
+ kr = &(mtd->eraseregions[ur_idx]);
+
+ if (put_user(kr->offset, &(ur->offset))
+ || put_user(kr->erasesize, &(ur->erasesize))
+ || put_user(kr->numblocks, &(ur->numblocks)))
return -EFAULT;
+
break;
}
case MEMGETINFO:
- if (copy_to_user(argp, mtd, sizeof(struct mtd_info_user)))
+ info.type = mtd->type;
+ info.flags = mtd->flags;
+ info.size = mtd->size;
+ info.erasesize = mtd->erasesize;
+ info.writesize = mtd->writesize;
+ info.oobsize = mtd->oobsize;
+ /* The below fields are obsolete */
+ info.ecctype = -1;
+ info.eccsize = 0;
+ if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
return -EFAULT;
break;
{
struct erase_info *erase;
- if(!(file->f_mode & 2))
+ if(!(file->f_mode & FMODE_WRITE))
return -EPERM;
- erase=kmalloc(sizeof(struct erase_info),GFP_KERNEL);
+ erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
if (!erase)
ret = -ENOMEM;
else {
+ struct erase_info_user einfo;
+
wait_queue_head_t waitq;
DECLARE_WAITQUEUE(wait, current);
init_waitqueue_head(&waitq);
- memset (erase,0,sizeof(struct erase_info));
- if (copy_from_user(&erase->addr, argp,
+ if (copy_from_user(&einfo, argp,
sizeof(struct erase_info_user))) {
kfree(erase);
return -EFAULT;
}
+ erase->addr = einfo.start;
+ erase->len = einfo.length;
erase->mtd = mtd;
erase->callback = mtdchar_erase_callback;
erase->priv = (unsigned long)&waitq;
-
+
/*
FIXME: Allow INTERRUPTIBLE. Which means
not having the wait_queue head on the stack.
-
+
If the wq_head is on the stack, and we
leave because we got interrupted, then the
wq_head is no longer there when the
case MEMWRITEOOB:
{
struct mtd_oob_buf buf;
- void *databuf;
- ssize_t retlen;
-
- if(!(file->f_mode & 2))
+ struct mtd_oob_ops ops;
+ struct mtd_oob_buf __user *user_buf = argp;
+ uint32_t retlen;
+
+ if(!(file->f_mode & FMODE_WRITE))
return -EPERM;
if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
return -EFAULT;
-
- if (buf.length > 0x4096)
+
+ if (buf.length > 4096)
return -EINVAL;
if (!mtd->write_oob)
if (ret)
return ret;
- databuf = kmalloc(buf.length, GFP_KERNEL);
- if (!databuf)
+ ops.ooblen = buf.length;
+ ops.ooboffs = buf.start & (mtd->oobsize - 1);
+ ops.datbuf = NULL;
+ ops.mode = MTD_OOB_PLACE;
+
+ if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
+ return -EINVAL;
+
+ ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
+ if (!ops.oobbuf)
return -ENOMEM;
-
- if (copy_from_user(databuf, buf.ptr, buf.length)) {
- kfree(databuf);
+
+ if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
+ kfree(ops.oobbuf);
return -EFAULT;
}
- ret = (mtd->write_oob)(mtd, buf.start, buf.length, &retlen, databuf);
+ buf.start &= ~(mtd->oobsize - 1);
+ ret = mtd->write_oob(mtd, buf.start, &ops);
- if (copy_to_user(argp + sizeof(uint32_t), &retlen, sizeof(uint32_t)))
+ if (ops.oobretlen > 0xFFFFFFFFU)
+ ret = -EOVERFLOW;
+ retlen = ops.oobretlen;
+ if (copy_to_user(&user_buf->length, &retlen, sizeof(buf.length)))
ret = -EFAULT;
- kfree(databuf);
+ kfree(ops.oobbuf);
break;
}
case MEMREADOOB:
{
struct mtd_oob_buf buf;
- void *databuf;
- ssize_t retlen;
+ struct mtd_oob_ops ops;
if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
return -EFAULT;
-
- if (buf.length > 0x4096)
+
+ if (buf.length > 4096)
return -EINVAL;
if (!mtd->read_oob)
else
ret = access_ok(VERIFY_WRITE, buf.ptr,
buf.length) ? 0 : -EFAULT;
-
if (ret)
return ret;
- databuf = kmalloc(buf.length, GFP_KERNEL);
- if (!databuf)
+ ops.ooblen = buf.length;
+ ops.ooboffs = buf.start & (mtd->oobsize - 1);
+ ops.datbuf = NULL;
+ ops.mode = MTD_OOB_PLACE;
+
+ if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
+ return -EINVAL;
+
+ ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
+ if (!ops.oobbuf)
return -ENOMEM;
-
- ret = (mtd->read_oob)(mtd, buf.start, buf.length, &retlen, databuf);
- if (put_user(retlen, (uint32_t __user *)argp))
+ buf.start &= ~(mtd->oobsize - 1);
+ ret = mtd->read_oob(mtd, buf.start, &ops);
+
+ if (put_user(ops.oobretlen, (uint32_t __user *)argp))
ret = -EFAULT;
- else if (retlen && copy_to_user(buf.ptr, databuf, retlen))
+ else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
+ ops.oobretlen))
ret = -EFAULT;
-
- kfree(databuf);
+
+ kfree(ops.oobbuf);
break;
}
case MEMLOCK:
{
- struct erase_info_user info;
+ struct erase_info_user einfo;
- if (copy_from_user(&info, argp, sizeof(info)))
+ if (copy_from_user(&einfo, argp, sizeof(einfo)))
return -EFAULT;
if (!mtd->lock)
ret = -EOPNOTSUPP;
else
- ret = mtd->lock(mtd, info.start, info.length);
+ ret = mtd->lock(mtd, einfo.start, einfo.length);
break;
}
case MEMUNLOCK:
{
- struct erase_info_user info;
+ struct erase_info_user einfo;
- if (copy_from_user(&info, argp, sizeof(info)))
+ if (copy_from_user(&einfo, argp, sizeof(einfo)))
return -EFAULT;
if (!mtd->unlock)
ret = -EOPNOTSUPP;
else
- ret = mtd->unlock(mtd, info.start, info.length);
- break;
- }
-
- case MEMSETOOBSEL:
- {
- if (copy_from_user(&mtd->oobinfo, argp, sizeof(struct nand_oobinfo)))
- return -EFAULT;
+ ret = mtd->unlock(mtd, einfo.start, einfo.length);
break;
}
+ /* Legacy interface */
case MEMGETOOBSEL:
{
- if (copy_to_user(argp, &(mtd->oobinfo), sizeof(struct nand_oobinfo)))
+ struct nand_oobinfo oi;
+
+ if (!mtd->ecclayout)
+ return -EOPNOTSUPP;
+ if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
+ return -EINVAL;
+
+ oi.useecc = MTD_NANDECC_AUTOPLACE;
+ memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
+ memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
+ sizeof(oi.oobfree));
+ oi.eccbytes = mtd->ecclayout->eccbytes;
+
+ if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
return -EFAULT;
break;
}
case MEMGETBADBLOCK:
{
loff_t offs;
-
+
if (copy_from_user(&offs, argp, sizeof(loff_t)))
return -EFAULT;
if (!mtd->block_isbad)
break;
}
-#ifdef CONFIG_MTD_OTP
+#ifdef CONFIG_HAVE_MTD_OTP
case OTPSELECT:
{
int mode;
if (copy_from_user(&mode, argp, sizeof(int)))
return -EFAULT;
- SET_MTD_MODE(file, 0);
- switch (mode) {
- case MTD_OTP_FACTORY:
- if (!mtd->read_fact_prot_reg)
- ret = -EOPNOTSUPP;
- else
- SET_MTD_MODE(file, MTD_MODE_OTP_FACT);
- break;
- case MTD_OTP_USER:
- if (!mtd->read_fact_prot_reg)
- ret = -EOPNOTSUPP;
- else
- SET_MTD_MODE(file, MTD_MODE_OTP_USER);
- break;
- default:
- ret = -EINVAL;
- case MTD_OTP_OFF:
- break;
- }
+
+ mfi->mode = MTD_MODE_NORMAL;
+
+ ret = otp_select_filemode(mfi, mode);
+
+ file->f_pos = 0;
break;
}
if (!buf)
return -ENOMEM;
ret = -EOPNOTSUPP;
- switch (MTD_MODE(file)) {
- case MTD_MODE_OTP_FACT:
+ switch (mfi->mode) {
+ case MTD_MODE_OTP_FACTORY:
if (mtd->get_fact_prot_info)
ret = mtd->get_fact_prot_info(mtd, buf, 4096);
break;
if (mtd->get_user_prot_info)
ret = mtd->get_user_prot_info(mtd, buf, 4096);
break;
+ default:
+ break;
}
if (ret >= 0) {
if (cmd == OTPGETREGIONCOUNT) {
case OTPLOCK:
{
- struct otp_info info;
+ struct otp_info oinfo;
- if (MTD_MODE(file) != MTD_MODE_OTP_USER)
+ if (mfi->mode != MTD_MODE_OTP_USER)
return -EINVAL;
- if (copy_from_user(&info, argp, sizeof(info)))
+ if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
return -EFAULT;
if (!mtd->lock_user_prot_reg)
return -EOPNOTSUPP;
- ret = mtd->lock_user_prot_reg(mtd, info.start, info.length);
+ ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
break;
}
#endif
+ case ECCGETLAYOUT:
+ {
+ if (!mtd->ecclayout)
+ return -EOPNOTSUPP;
+
+ if (copy_to_user(argp, mtd->ecclayout,
+ sizeof(struct nand_ecclayout)))
+ return -EFAULT;
+ break;
+ }
+
+ case ECCGETSTATS:
+ {
+ if (copy_to_user(argp, &mtd->ecc_stats,
+ sizeof(struct mtd_ecc_stats)))
+ return -EFAULT;
+ break;
+ }
+
+ case MTDFILEMODE:
+ {
+ mfi->mode = 0;
+
+ switch(arg) {
+ case MTD_MODE_OTP_FACTORY:
+ case MTD_MODE_OTP_USER:
+ ret = otp_select_filemode(mfi, arg);
+ break;
+
+ case MTD_MODE_RAW:
+ if (!mtd->read_oob || !mtd->write_oob)
+ return -EOPNOTSUPP;
+ mfi->mode = arg;
+
+ case MTD_MODE_NORMAL:
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ file->f_pos = 0;
+ break;
+ }
+
default:
ret = -ENOTTY;
}
return ret;
} /* memory_ioctl */
-static struct file_operations mtd_fops = {
+/*
+ * try to determine where a shared mapping can be made
+ * - only supported for NOMMU at the moment (MMU can't doesn't copy private
+ * mappings)
+ */
+#ifndef CONFIG_MMU
+static unsigned long mtd_get_unmapped_area(struct file *file,
+ unsigned long addr,
+ unsigned long len,
+ unsigned long pgoff,
+ unsigned long flags)
+{
+ struct mtd_file_info *mfi = file->private_data;
+ struct mtd_info *mtd = mfi->mtd;
+
+ if (mtd->get_unmapped_area) {
+ unsigned long offset;
+
+ if (addr != 0)
+ return (unsigned long) -EINVAL;
+
+ if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
+ return (unsigned long) -EINVAL;
+
+ offset = pgoff << PAGE_SHIFT;
+ if (offset > mtd->size - len)
+ return (unsigned long) -EINVAL;
+
+ return mtd->get_unmapped_area(mtd, len, offset, flags);
+ }
+
+ /* can't map directly */
+ return (unsigned long) -ENOSYS;
+}
+#endif
+
+/*
+ * set up a mapping for shared memory segments
+ */
+static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
+{
+#ifdef CONFIG_MMU
+ struct mtd_file_info *mfi = file->private_data;
+ struct mtd_info *mtd = mfi->mtd;
+
+ if (mtd->type == MTD_RAM || mtd->type == MTD_ROM)
+ return 0;
+ return -ENOSYS;
+#else
+ return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
+#endif
+}
+
+static const struct file_operations mtd_fops = {
.owner = THIS_MODULE,
.llseek = mtd_lseek,
.read = mtd_read,
.ioctl = mtd_ioctl,
.open = mtd_open,
.release = mtd_close,
+ .mmap = mtd_mmap,
+#ifndef CONFIG_MMU
+ .get_unmapped_area = mtd_get_unmapped_area,
+#endif
};
static int __init init_mtdchar(void)
{
- if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
+ int status;
+
+ status = register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops);
+ if (status < 0) {
printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
MTD_CHAR_MAJOR);
- return -EAGAIN;
}
- mtdchar_devfs_init();
- return 0;
+ return status;
}
static void __exit cleanup_mtdchar(void)
{
- mtdchar_devfs_exit();
unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
}
module_init(init_mtdchar);
module_exit(cleanup_mtdchar);
+MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Direct character-device access to MTD devices");
+MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff