/*
- * $Id: mtdchar.c,v 1.54 2003/05/21 10:50:43 dwmw2 Exp $
+ * $Id: mtdchar.c,v 1.76 2005/11/07 11:14:20 gleixner Exp $
*
* Character-device access to raw MTD devices.
*
*/
#include <linux/config.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/mtd/mtd.h>
#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/fs.h>
+#include <linux/sched.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/compatmac.h>
+
#include <asm/uaccess.h>
-#ifdef CONFIG_DEVFS_FS
-#include <linux/devfs_fs_kernel.h>
-static void mtd_notify_add(struct mtd_info* mtd);
-static void mtd_notify_remove(struct mtd_info* mtd);
+static struct class *mtd_class;
+
+static void mtd_notify_add(struct mtd_info* mtd)
+{
+ if (!mtd)
+ return;
+
+ class_device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
+ NULL, "mtd%d", mtd->index);
+
+ class_device_create(mtd_class, NULL,
+ MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
+ NULL, "mtd%dro", mtd->index);
+}
+
+static void mtd_notify_remove(struct mtd_info* mtd)
+{
+ if (!mtd)
+ return;
+
+ class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
+ class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
+}
static struct mtd_notifier notifier = {
.add = mtd_notify_add,
.remove = mtd_notify_remove,
};
-#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=(struct mtd_info *)file->private_data;
+ 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;
+ offset += file->f_pos;
break;
case 2:
/* SEEK_END */
- file->f_pos =mtd->size + offset;
+ 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;
}
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 */
DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
- mtd = (struct mtd_info *)file->private_data;
-
+ mtd = TO_MTD(file);
+
if (mtd->sync)
mtd->sync(mtd);
-
+
put_mtd_device(mtd);
return 0;
*/
#define MAX_KMALLOC_SIZE 0x20000
-static ssize_t mtd_read(struct file *file, char *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 = (struct mtd_info *)file->private_data;
+ 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)
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)
+ if (count > MAX_KMALLOC_SIZE)
len = MAX_KMALLOC_SIZE;
else
len = count;
kbuf=kmalloc(len,GFP_KERNEL);
if (!kbuf)
return -ENOMEM;
-
- ret = MTD_READ(mtd, *ppos, len, &retlen, kbuf);
- if (!ret) {
+
+ 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);
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 *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 = (struct mtd_info *)file->private_data;
+ struct mtd_info *mtd = TO_MTD(file);
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;
return 0;
while (count) {
- if (count > MAX_KMALLOC_SIZE)
+ if (count > MAX_KMALLOC_SIZE)
len = MAX_KMALLOC_SIZE;
else
len = count;
kfree(kbuf);
return -EFAULT;
}
-
- ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
+
+ 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;
kfree(kbuf);
return ret;
}
-
+
kfree(kbuf);
}
IOCTL calls for getting device parameters.
======================================================================*/
-static void mtd_erase_callback (struct erase_info *instr)
+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 = (struct mtd_info *)file->private_data;
+ 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) {
- ret = verify_area(VERIFY_READ, (char *)arg, size);
- if (ret) return ret;
+ if (!access_ok(VERIFY_READ, argp, size))
+ return -EFAULT;
}
if (cmd & IOC_OUT) {
- ret = verify_area(VERIFY_WRITE, (char *)arg, size);
- if (ret) return ret;
+ if (!access_ok(VERIFY_WRITE, argp, size))
+ return -EFAULT;
}
-
+
switch (cmd) {
case MEMGETREGIONCOUNT:
- if (copy_to_user((int *) arg, &(mtd->numeraseregions), sizeof(int)))
+ if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
return -EFAULT;
break;
{
struct region_info_user ur;
- if (copy_from_user( &ur,
- (struct region_info_user *)arg,
- sizeof(struct region_info_user))) {
+ if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
return -EFAULT;
- }
if (ur.regionindex >= mtd->numeraseregions)
return -EINVAL;
- if (copy_to_user((struct mtd_erase_region_info *) arg,
- &(mtd->eraseregions[ur.regionindex]),
+ if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
sizeof(struct mtd_erase_region_info)))
return -EFAULT;
break;
}
case MEMGETINFO:
- if (copy_to_user((struct mtd_info *)arg, mtd,
- sizeof(struct mtd_info_user)))
+ if (copy_to_user(argp, mtd, sizeof(struct mtd_info_user)))
return -EFAULT;
break;
init_waitqueue_head(&waitq);
memset (erase,0,sizeof(struct erase_info));
- if (copy_from_user(&erase->addr, (u_long *)arg,
- 2 * sizeof(u_long))) {
+ if (copy_from_user(&erase->addr, argp,
+ sizeof(struct erase_info_user))) {
kfree(erase);
return -EFAULT;
}
erase->mtd = mtd;
- erase->callback = mtd_erase_callback;
+ 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
struct mtd_oob_buf buf;
void *databuf;
ssize_t retlen;
-
+
if(!(file->f_mode & 2))
return -EPERM;
- if (copy_from_user(&buf, (struct mtd_oob_buf *)arg, sizeof(struct mtd_oob_buf)))
+ 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 = verify_area(VERIFY_READ, (char *)buf.ptr, buf.length);
+ 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((void *)arg + sizeof(u_int32_t), &retlen, sizeof(u_int32_t)))
+ if (copy_to_user(argp + sizeof(uint32_t), &retlen, sizeof(uint32_t)))
ret = -EFAULT;
kfree(databuf);
void *databuf;
ssize_t retlen;
- if (copy_from_user(&buf, (struct mtd_oob_buf *)arg, sizeof(struct mtd_oob_buf)))
+ 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 = verify_area(VERIFY_WRITE, (char *)buf.ptr, buf.length);
+ 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 (copy_to_user((void *)arg + sizeof(u_int32_t), &retlen, sizeof(u_int32_t)))
+ 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:
{
- unsigned long adrs[2];
+ struct erase_info_user info;
- if (copy_from_user(adrs ,(void *)arg, 2* sizeof(unsigned long)))
+ if (copy_from_user(&info, argp, sizeof(info)))
return -EFAULT;
if (!mtd->lock)
ret = -EOPNOTSUPP;
else
- ret = mtd->lock(mtd, adrs[0], adrs[1]);
+ ret = mtd->lock(mtd, info.start, info.length);
break;
}
case MEMUNLOCK:
{
- unsigned long adrs[2];
+ struct erase_info_user info;
- if (copy_from_user(adrs, (void *)arg, 2* sizeof(unsigned long)))
+ if (copy_from_user(&info, argp, sizeof(info)))
return -EFAULT;
if (!mtd->unlock)
ret = -EOPNOTSUPP;
else
- ret = mtd->unlock(mtd, adrs[0], adrs[1]);
+ ret = mtd->unlock(mtd, info.start, info.length);
break;
}
case MEMSETOOBSEL:
{
- if (copy_from_user(&mtd->oobinfo ,(void *)arg, sizeof(struct nand_oobinfo)))
+ 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;
+ }
+ file->f_pos = 0;
+ 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:
- DEBUG(MTD_DEBUG_LEVEL0, "Invalid ioctl %x (MEMGETINFO = %x)\n", cmd, MEMGETINFO);
ret = -ENOTTY;
}
.release = mtd_close,
};
-
-#ifdef CONFIG_DEVFS_FS
-/* Notification that a new device has been added. Create the devfs entry for
- * it. */
-
-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 | S_IWUGO, "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);
-}
-#endif
-
static int __init init_mtdchar(void)
{
if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
return -EAGAIN;
}
-#ifdef CONFIG_DEVFS_FS
- devfs_mk_dir("mtd");
+ mtd_class = class_create(THIS_MODULE, "mtd");
+
+ if (IS_ERR(mtd_class)) {
+ printk(KERN_ERR "Error creating mtd class.\n");
+ unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
+ return PTR_ERR(mtd_class);
+ }
register_mtd_user(¬ifier);
-#endif
return 0;
}
static void __exit cleanup_mtdchar(void)
{
-#ifdef CONFIG_DEVFS_FS
unregister_mtd_user(¬ifier);
- devfs_remove("mtd");
-#endif
+ class_destroy(mtd_class);
unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
}
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