devfs: Drop dev_lseek_default() ...

Only the following cdevs do not declare an .lseek() operation:

  - Console devices in common/console.c
  - Firmware framework in common/firmware.c
  - JTAG driver in drivers/misc/jtag.c
  - UBI in drivers/mtd/ubi/barebox.c

Of those four, first two are marked DEVFS_IS_CHARACTER_DEV and
implement only .write() operation and the last two don't implement
anything but .ioctl(). While there's probably no meaningful way to use
lseek() against any of those devices, there doesn't seem to be any
harm in allowing it either.

Change devfs_lseek() to ignore absense of .lseek() callback and drop
dev_lseek_default() and all references to it in the codebase.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

rename file_operations -> cdev_operations ...

Linux also has struct file_operations which are something different.
Rename our file_operations to cdev_operations which better matches
what we have.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

string: Fix (v)asprintf prototypes ...

Our asprintf and vasprintf have different prototypes than the glibc
functions. This causes trouble when we want to share barebox code
with userspace code. Change the prototypes for (v)asprintf to match
the glibc prototypes. Since the current (v)asprintf are convenient
to use change the existing functions to b(v)asprintf.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: mtdoob device: change name to have the chip name first ...

Normally all device files assoctiated to a mtd device begin with
the chip name itself. Only the mtdoob device is an exception:
it begins with the chip name without the index end ends with the
index. Change the name to be like the other names, i.e. change
nand_oob0 to nand0.oob.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: Make devname argument to add_mtd_device const ...

add_mtd_device duplicates the string where necessary, so make it
const.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: Update internal API to support 64-bit device size ...

MTD internal API presently uses 32-bit values to represent device
size. This patch updates them to 64-bits but leaves the external API
unchanged.

In general, changing from 32-bit to 64-bit values cause little
or no changes to the majority of the code with the following
exceptions:
  - printk message formats;
  - division and modulus of 64-bit values (mtd_div_by_wb,
    mtd_div_by_eb may be used in some of such cases).

Was tested on phyFLEX i.MX6.

Signed-off-by: Dmitry Lavnikevich <d.lavnikevich@sam-solutions.com>
Signed-off-by: Grigory Milev <g.milev@sam-solutions.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: mtdoob: Do not create for partitions ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: introduce mtd_read_oob and mtd_write_oob ...

Directly copied from the Kernel as of 3.11-rc1

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: rename mtd_read_oob ...

There is the same function name in the Kernel but with different
semantics. Rename to avoid naming conflicts when we update the
mtd support from the kernel.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: rename MTD_OOB_* to MTD_OPS_* ...

To sync with the Linux kernel.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd oob: do not register oob device for devices without oob ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: add private data to mtddev-hook ...

The mtdoob and mtdraw device don't clean up correctly.
Added a private data element to hold allocated memory.
Fix remove of mtdoob and mtdraw device.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

use loff_t for file offsets ...

This is a first step for 64bit file support: Make the file sizes/offsets
64bit.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/mtd: split mtd mtdoob devices ...

Split /dev/mtd and /dev/mtdoob devices.
Remove from mtd structure the mtdoob character device.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>