[MTD] Unabuse file-f_mode for OTP purpose
Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
parent
31f4233bae
commit
045e9a5d51
|
@ -1,5 +1,5 @@
|
||||||
/*
|
/*
|
||||||
* $Id: mtdchar.c,v 1.67 2005/02/08 17:45:51 nico Exp $
|
* $Id: mtdchar.c,v 1.68 2005/02/08 19:12:50 nico Exp $
|
||||||
*
|
*
|
||||||
* Character-device access to raw MTD devices.
|
* Character-device access to raw MTD devices.
|
||||||
*
|
*
|
||||||
|
@ -59,15 +59,25 @@ static inline void mtdchar_devfs_exit(void)
|
||||||
#define mtdchar_devfs_exit() do { } while(0)
|
#define mtdchar_devfs_exit() do { } while(0)
|
||||||
#endif
|
#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.
|
||||||
|
*/
|
||||||
|
|
||||||
/* Well... let's abuse the unused bits in file->f_mode for those */
|
#define TO_MTD(file) (struct mtd_info *)((long)((file)->private_data) & ~3L)
|
||||||
#define MTD_MODE_OTP_FACT 0x1000
|
|
||||||
#define MTD_MODE_OTP_USER 0x2000
|
#define MTD_MODE_OTP_FACT 1
|
||||||
#define MTD_MODE_MASK 0xf000
|
#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)
|
static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
|
||||||
{
|
{
|
||||||
struct mtd_info *mtd = file->private_data;
|
struct mtd_info *mtd = TO_MTD(file);
|
||||||
|
|
||||||
switch (orig) {
|
switch (orig) {
|
||||||
case 0:
|
case 0:
|
||||||
|
@ -111,10 +121,6 @@ static int mtd_open(struct inode *inode, struct file *file)
|
||||||
if ((file->f_mode & 2) && (minor & 1))
|
if ((file->f_mode & 2) && (minor & 1))
|
||||||
return -EACCES;
|
return -EACCES;
|
||||||
|
|
||||||
/* make sure the locally abused bits are initialy clear */
|
|
||||||
if (file->f_mode & MTD_MODE_MASK)
|
|
||||||
return -EWOULDBLOCK;
|
|
||||||
|
|
||||||
mtd = get_mtd_device(NULL, devnum);
|
mtd = get_mtd_device(NULL, devnum);
|
||||||
|
|
||||||
if (!mtd)
|
if (!mtd)
|
||||||
|
@ -144,7 +150,7 @@ static int mtd_close(struct inode *inode, struct file *file)
|
||||||
|
|
||||||
DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
|
DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
|
||||||
|
|
||||||
mtd = file->private_data;
|
mtd = TO_MTD(file);
|
||||||
|
|
||||||
if (mtd->sync)
|
if (mtd->sync)
|
||||||
mtd->sync(mtd);
|
mtd->sync(mtd);
|
||||||
|
@ -161,7 +167,7 @@ static int mtd_close(struct inode *inode, struct file *file)
|
||||||
|
|
||||||
static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
|
static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
|
||||||
{
|
{
|
||||||
struct mtd_info *mtd = file->private_data;
|
struct mtd_info *mtd = TO_MTD(file);
|
||||||
size_t retlen=0;
|
size_t retlen=0;
|
||||||
size_t total_retlen=0;
|
size_t total_retlen=0;
|
||||||
int ret=0;
|
int ret=0;
|
||||||
|
@ -188,7 +194,7 @@ static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t
|
||||||
if (!kbuf)
|
if (!kbuf)
|
||||||
return -ENOMEM;
|
return -ENOMEM;
|
||||||
|
|
||||||
switch (file->f_mode & MTD_MODE_MASK) {
|
switch (MTD_MODE(file)) {
|
||||||
case MTD_MODE_OTP_FACT:
|
case MTD_MODE_OTP_FACT:
|
||||||
ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
|
ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
|
||||||
break;
|
break;
|
||||||
|
@ -231,7 +237,7 @@ static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t
|
||||||
|
|
||||||
static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
|
static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
|
||||||
{
|
{
|
||||||
struct mtd_info *mtd = file->private_data;
|
struct mtd_info *mtd = TO_MTD(file);
|
||||||
char *kbuf;
|
char *kbuf;
|
||||||
size_t retlen;
|
size_t retlen;
|
||||||
size_t total_retlen=0;
|
size_t total_retlen=0;
|
||||||
|
@ -266,7 +272,7 @@ static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count
|
||||||
return -EFAULT;
|
return -EFAULT;
|
||||||
}
|
}
|
||||||
|
|
||||||
switch (file->f_mode & MTD_MODE_MASK) {
|
switch (MTD_MODE(file)) {
|
||||||
case MTD_MODE_OTP_FACT:
|
case MTD_MODE_OTP_FACT:
|
||||||
ret = -EROFS;
|
ret = -EROFS;
|
||||||
break;
|
break;
|
||||||
|
@ -310,7 +316,7 @@ static void mtdchar_erase_callback (struct erase_info *instr)
|
||||||
static int mtd_ioctl(struct inode *inode, struct file *file,
|
static int mtd_ioctl(struct inode *inode, struct file *file,
|
||||||
u_int cmd, u_long arg)
|
u_int cmd, u_long arg)
|
||||||
{
|
{
|
||||||
struct mtd_info *mtd = file->private_data;
|
struct mtd_info *mtd = TO_MTD(file);
|
||||||
void __user *argp = (void __user *)arg;
|
void __user *argp = (void __user *)arg;
|
||||||
int ret = 0;
|
int ret = 0;
|
||||||
u_long size;
|
u_long size;
|
||||||
|
@ -558,19 +564,19 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
|
||||||
int mode;
|
int mode;
|
||||||
if (copy_from_user(&mode, argp, sizeof(int)))
|
if (copy_from_user(&mode, argp, sizeof(int)))
|
||||||
return -EFAULT;
|
return -EFAULT;
|
||||||
file->f_mode &= ~MTD_MODE_MASK;
|
SET_MTD_MODE(file, 0);
|
||||||
switch (mode) {
|
switch (mode) {
|
||||||
case MTD_OTP_FACTORY:
|
case MTD_OTP_FACTORY:
|
||||||
if (!mtd->read_fact_prot_reg)
|
if (!mtd->read_fact_prot_reg)
|
||||||
ret = -EOPNOTSUPP;
|
ret = -EOPNOTSUPP;
|
||||||
else
|
else
|
||||||
file->f_mode |= MTD_MODE_OTP_FACT;
|
SET_MTD_MODE(file, MTD_MODE_OTP_FACT);
|
||||||
break;
|
break;
|
||||||
case MTD_OTP_USER:
|
case MTD_OTP_USER:
|
||||||
if (!mtd->read_fact_prot_reg)
|
if (!mtd->read_fact_prot_reg)
|
||||||
ret = -EOPNOTSUPP;
|
ret = -EOPNOTSUPP;
|
||||||
else
|
else
|
||||||
file->f_mode |= MTD_MODE_OTP_USER;
|
SET_MTD_MODE(file, MTD_MODE_OTP_USER);
|
||||||
break;
|
break;
|
||||||
default:
|
default:
|
||||||
ret = -EINVAL;
|
ret = -EINVAL;
|
||||||
|
@ -587,7 +593,7 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
|
||||||
if (!buf)
|
if (!buf)
|
||||||
return -ENOMEM;
|
return -ENOMEM;
|
||||||
ret = -EOPNOTSUPP;
|
ret = -EOPNOTSUPP;
|
||||||
switch (file->f_mode & MTD_MODE_MASK) {
|
switch (MTD_MODE(file)) {
|
||||||
case MTD_MODE_OTP_FACT:
|
case MTD_MODE_OTP_FACT:
|
||||||
if (mtd->get_fact_prot_info)
|
if (mtd->get_fact_prot_info)
|
||||||
ret = mtd->get_fact_prot_info(mtd, buf, 4096);
|
ret = mtd->get_fact_prot_info(mtd, buf, 4096);
|
||||||
|
@ -614,7 +620,7 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
|
||||||
{
|
{
|
||||||
struct otp_info info;
|
struct otp_info info;
|
||||||
|
|
||||||
if ((file->f_mode & MTD_MODE_MASK) != MTD_MODE_OTP_USER)
|
if (MTD_MODE(file) != MTD_MODE_OTP_USER)
|
||||||
return -EINVAL;
|
return -EINVAL;
|
||||||
if (copy_from_user(&info, argp, sizeof(info)))
|
if (copy_from_user(&info, argp, sizeof(info)))
|
||||||
return -EFAULT;
|
return -EFAULT;
|
||||||
|
|
Loading…
Reference in New Issue