mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 00:52:01 +00:00
045e9a5d51
Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
676 lines
14 KiB
C
676 lines
14 KiB
C
/*
|
|
* $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/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);
|
|
}
|
|
|
|
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,
|
|
};
|
|
|
|
static inline void mtdchar_devfs_init(void)
|
|
{
|
|
devfs_mk_dir("mtd");
|
|
register_mtd_user(¬ifier);
|
|
}
|
|
|
|
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.
|
|
*/
|
|
|
|
#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)
|
|
|
|
static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
|
|
{
|
|
struct mtd_info *mtd = TO_MTD(file);
|
|
|
|
switch (orig) {
|
|
case 0:
|
|
/* SEEK_SET */
|
|
file->f_pos = offset;
|
|
break;
|
|
case 1:
|
|
/* SEEK_CUR */
|
|
file->f_pos += offset;
|
|
break;
|
|
case 2:
|
|
/* SEEK_END */
|
|
file->f_pos =mtd->size + offset;
|
|
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;
|
|
|
|
return file->f_pos;
|
|
}
|
|
|
|
|
|
|
|
static int mtd_open(struct inode *inode, struct file *file)
|
|
{
|
|
int minor = iminor(inode);
|
|
int devnum = minor >> 1;
|
|
struct mtd_info *mtd;
|
|
|
|
DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
|
|
|
|
if (devnum >= MAX_MTD_DEVICES)
|
|
return -ENODEV;
|
|
|
|
/* You can't open the RO devices RW */
|
|
if ((file->f_mode & 2) && (minor & 1))
|
|
return -EACCES;
|
|
|
|
mtd = get_mtd_device(NULL, devnum);
|
|
|
|
if (!mtd)
|
|
return -ENODEV;
|
|
|
|
if (MTD_ABSENT == mtd->type) {
|
|
put_mtd_device(mtd);
|
|
return -ENODEV;
|
|
}
|
|
|
|
file->private_data = mtd;
|
|
|
|
/* You can't open it RW if it's not a writeable device */
|
|
if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
|
|
put_mtd_device(mtd);
|
|
return -EACCES;
|
|
}
|
|
|
|
return 0;
|
|
} /* mtd_open */
|
|
|
|
/*====================================================================*/
|
|
|
|
static int mtd_close(struct inode *inode, struct file *file)
|
|
{
|
|
struct mtd_info *mtd;
|
|
|
|
DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
|
|
|
|
mtd = TO_MTD(file);
|
|
|
|
if (mtd->sync)
|
|
mtd->sync(mtd);
|
|
|
|
put_mtd_device(mtd);
|
|
|
|
return 0;
|
|
} /* mtd_close */
|
|
|
|
/* FIXME: This _really_ needs to die. In 2.5, we should lock the
|
|
userspace buffer down and use it directly with readv/writev.
|
|
*/
|
|
#define MAX_KMALLOC_SIZE 0x20000
|
|
|
|
static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
|
|
{
|
|
struct mtd_info *mtd = TO_MTD(file);
|
|
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)
|
|
count = mtd->size - *ppos;
|
|
|
|
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 */
|
|
while (count) {
|
|
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:
|
|
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;
|
|
default:
|
|
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 !
|
|
* Userspace software which accesses NAND this way
|
|
* must be aware of the fact that it deals with NAND
|
|
*/
|
|
if (!ret || (ret == -EBADMSG)) {
|
|
*ppos += retlen;
|
|
if (copy_to_user(buf, kbuf, retlen)) {
|
|
kfree(kbuf);
|
|
return -EFAULT;
|
|
}
|
|
else
|
|
total_retlen += retlen;
|
|
|
|
count -= retlen;
|
|
buf += retlen;
|
|
if (retlen == 0)
|
|
count = 0;
|
|
}
|
|
else {
|
|
kfree(kbuf);
|
|
return ret;
|
|
}
|
|
|
|
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);
|
|
char *kbuf;
|
|
size_t retlen;
|
|
size_t total_retlen=0;
|
|
int ret=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;
|
|
|
|
while (count) {
|
|
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:
|
|
ret = -EROFS;
|
|
break;
|
|
case MTD_MODE_OTP_USER:
|
|
if (!mtd->write_user_prot_reg) {
|
|
ret = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
|
|
break;
|
|
default:
|
|
ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
|
|
}
|
|
if (!ret) {
|
|
*ppos += retlen;
|
|
total_retlen += retlen;
|
|
count -= retlen;
|
|
buf += retlen;
|
|
}
|
|
else {
|
|
kfree(kbuf);
|
|
return ret;
|
|
}
|
|
|
|
kfree(kbuf);
|
|
}
|
|
|
|
return total_retlen;
|
|
} /* mtd_write */
|
|
|
|
/*======================================================================
|
|
|
|
IOCTL calls for getting device parameters.
|
|
|
|
======================================================================*/
|
|
static void mtdchar_erase_callback (struct erase_info *instr)
|
|
{
|
|
wake_up((wait_queue_head_t *)instr->priv);
|
|
}
|
|
|
|
static int mtd_ioctl(struct inode *inode, struct file *file,
|
|
u_int cmd, u_long arg)
|
|
{
|
|
struct mtd_info *mtd = TO_MTD(file);
|
|
void __user *argp = (void __user *)arg;
|
|
int ret = 0;
|
|
u_long size;
|
|
|
|
DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
|
|
|
|
size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
|
|
if (cmd & IOC_IN) {
|
|
if (!access_ok(VERIFY_READ, argp, size))
|
|
return -EFAULT;
|
|
}
|
|
if (cmd & IOC_OUT) {
|
|
if (!access_ok(VERIFY_WRITE, argp, size))
|
|
return -EFAULT;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case MEMGETREGIONCOUNT:
|
|
if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case MEMGETREGIONINFO:
|
|
{
|
|
struct region_info_user ur;
|
|
|
|
if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
|
|
return -EFAULT;
|
|
|
|
if (ur.regionindex >= mtd->numeraseregions)
|
|
return -EINVAL;
|
|
if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
|
|
sizeof(struct mtd_erase_region_info)))
|
|
return -EFAULT;
|
|
break;
|
|
}
|
|
|
|
case MEMGETINFO:
|
|
if (copy_to_user(argp, mtd, sizeof(struct mtd_info_user)))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case MEMERASE:
|
|
{
|
|
struct erase_info *erase;
|
|
|
|
if(!(file->f_mode & 2))
|
|
return -EPERM;
|
|
|
|
erase=kmalloc(sizeof(struct erase_info),GFP_KERNEL);
|
|
if (!erase)
|
|
ret = -ENOMEM;
|
|
else {
|
|
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,
|
|
sizeof(struct erase_info_user))) {
|
|
kfree(erase);
|
|
return -EFAULT;
|
|
}
|
|
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
|
|
callback routine tries to wake us up.
|
|
*/
|
|
ret = mtd->erase(mtd, erase);
|
|
if (!ret) {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
add_wait_queue(&waitq, &wait);
|
|
if (erase->state != MTD_ERASE_DONE &&
|
|
erase->state != MTD_ERASE_FAILED)
|
|
schedule();
|
|
remove_wait_queue(&waitq, &wait);
|
|
set_current_state(TASK_RUNNING);
|
|
|
|
ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
|
|
}
|
|
kfree(erase);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MEMWRITEOOB:
|
|
{
|
|
struct mtd_oob_buf buf;
|
|
void *databuf;
|
|
ssize_t retlen;
|
|
|
|
if(!(file->f_mode & 2))
|
|
return -EPERM;
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
|
|
return -EFAULT;
|
|
|
|
if (buf.length > 0x4096)
|
|
return -EINVAL;
|
|
|
|
if (!mtd->write_oob)
|
|
ret = -EOPNOTSUPP;
|
|
else
|
|
ret = access_ok(VERIFY_READ, buf.ptr,
|
|
buf.length) ? 0 : EFAULT;
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
databuf = kmalloc(buf.length, GFP_KERNEL);
|
|
if (!databuf)
|
|
return -ENOMEM;
|
|
|
|
if (copy_from_user(databuf, buf.ptr, buf.length)) {
|
|
kfree(databuf);
|
|
return -EFAULT;
|
|
}
|
|
|
|
ret = (mtd->write_oob)(mtd, buf.start, buf.length, &retlen, databuf);
|
|
|
|
if (copy_to_user(argp + sizeof(uint32_t), &retlen, sizeof(uint32_t)))
|
|
ret = -EFAULT;
|
|
|
|
kfree(databuf);
|
|
break;
|
|
|
|
}
|
|
|
|
case MEMREADOOB:
|
|
{
|
|
struct mtd_oob_buf buf;
|
|
void *databuf;
|
|
ssize_t retlen;
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
|
|
return -EFAULT;
|
|
|
|
if (buf.length > 0x4096)
|
|
return -EINVAL;
|
|
|
|
if (!mtd->read_oob)
|
|
ret = -EOPNOTSUPP;
|
|
else
|
|
ret = access_ok(VERIFY_WRITE, buf.ptr,
|
|
buf.length) ? 0 : -EFAULT;
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
databuf = kmalloc(buf.length, GFP_KERNEL);
|
|
if (!databuf)
|
|
return -ENOMEM;
|
|
|
|
ret = (mtd->read_oob)(mtd, buf.start, buf.length, &retlen, databuf);
|
|
|
|
if (put_user(retlen, (uint32_t __user *)argp))
|
|
ret = -EFAULT;
|
|
else if (retlen && copy_to_user(buf.ptr, databuf, retlen))
|
|
ret = -EFAULT;
|
|
|
|
kfree(databuf);
|
|
break;
|
|
}
|
|
|
|
case MEMLOCK:
|
|
{
|
|
struct erase_info_user info;
|
|
|
|
if (copy_from_user(&info, argp, sizeof(info)))
|
|
return -EFAULT;
|
|
|
|
if (!mtd->lock)
|
|
ret = -EOPNOTSUPP;
|
|
else
|
|
ret = mtd->lock(mtd, info.start, info.length);
|
|
break;
|
|
}
|
|
|
|
case MEMUNLOCK:
|
|
{
|
|
struct erase_info_user info;
|
|
|
|
if (copy_from_user(&info, argp, sizeof(info)))
|
|
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;
|
|
break;
|
|
}
|
|
|
|
case MEMGETOOBSEL:
|
|
{
|
|
if (copy_to_user(argp, &(mtd->oobinfo), 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)
|
|
ret = -EOPNOTSUPP;
|
|
else
|
|
return mtd->block_isbad(mtd, offs);
|
|
break;
|
|
}
|
|
|
|
case MEMSETBADBLOCK:
|
|
{
|
|
loff_t offs;
|
|
|
|
if (copy_from_user(&offs, argp, sizeof(loff_t)))
|
|
return -EFAULT;
|
|
if (!mtd->block_markbad)
|
|
ret = -EOPNOTSUPP;
|
|
else
|
|
return mtd->block_markbad(mtd, offs);
|
|
break;
|
|
}
|
|
|
|
#ifdef CONFIG_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;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case OTPGETREGIONCOUNT:
|
|
case OTPGETREGIONINFO:
|
|
{
|
|
struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
ret = -EOPNOTSUPP;
|
|
switch (MTD_MODE(file)) {
|
|
case MTD_MODE_OTP_FACT:
|
|
if (mtd->get_fact_prot_info)
|
|
ret = mtd->get_fact_prot_info(mtd, buf, 4096);
|
|
break;
|
|
case MTD_MODE_OTP_USER:
|
|
if (mtd->get_user_prot_info)
|
|
ret = mtd->get_user_prot_info(mtd, buf, 4096);
|
|
break;
|
|
}
|
|
if (ret >= 0) {
|
|
if (cmd == OTPGETREGIONCOUNT) {
|
|
int nbr = ret / sizeof(struct otp_info);
|
|
ret = copy_to_user(argp, &nbr, sizeof(int));
|
|
} else
|
|
ret = copy_to_user(argp, buf, ret);
|
|
if (ret)
|
|
ret = -EFAULT;
|
|
}
|
|
kfree(buf);
|
|
break;
|
|
}
|
|
|
|
case OTPLOCK:
|
|
{
|
|
struct otp_info info;
|
|
|
|
if (MTD_MODE(file) != MTD_MODE_OTP_USER)
|
|
return -EINVAL;
|
|
if (copy_from_user(&info, argp, sizeof(info)))
|
|
return -EFAULT;
|
|
if (!mtd->lock_user_prot_reg)
|
|
return -EOPNOTSUPP;
|
|
ret = mtd->lock_user_prot_reg(mtd, info.start, info.length);
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
default:
|
|
ret = -ENOTTY;
|
|
}
|
|
|
|
return ret;
|
|
} /* memory_ioctl */
|
|
|
|
static struct file_operations mtd_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = mtd_lseek,
|
|
.read = mtd_read,
|
|
.write = mtd_write,
|
|
.ioctl = mtd_ioctl,
|
|
.open = mtd_open,
|
|
.release = mtd_close,
|
|
};
|
|
|
|
static int __init init_mtdchar(void)
|
|
{
|
|
if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
|
|
printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
|
|
MTD_CHAR_MAJOR);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
mtdchar_devfs_init();
|
|
return 0;
|
|
}
|
|
|
|
static void __exit cleanup_mtdchar(void)
|
|
{
|
|
mtdchar_devfs_exit();
|
|
unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
|
|
}
|
|
|
|
module_init(init_mtdchar);
|
|
module_exit(cleanup_mtdchar);
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
|
|
MODULE_DESCRIPTION("Direct character-device access to MTD devices");
|