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[MTD] driver model updates

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Update driver model support in the MTD framework, so it fits
better into the current udev-based hotplug framework:

 - Each mtd_info now has a device node.  MTD drivers should set
   the dev.parent field to point to the physical device, before
   setting up partitions or otherwise declaring MTDs.

 - Those device nodes always map to /sys/class/mtdX device nodes,
   which no longer depend on MTD_CHARDEV.

 - Those mtdX sysfs nodes have a "starter set" of attributes;
   it's not yet sufficient to replace /proc/mtd.

 - Enabling MTD_CHARDEV provides /sys/class/mtdXro/ nodes and the
   /sys/class/mtd*/dev attributes (for udev, mdev, etc).

 - Include a MODULE_ALIAS_CHARDEV_MAJOR macro.  It'll work with
   udev creating the /dev/mtd* nodes, not just a static rootfs.

So the sysfs structure is pretty much what you'd expect, except
that readonly chardev nodes are a bit quirky.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Brownell
2009-03-26 00:42:41 -07:00
committed by David Woodhouse
parent 9d63287a46
commit 1f24b5a8ec
5 changed files with 137 additions and 42 deletions
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7
include/linux/mtd/mtd.h
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@@ -11,6 +11,7 @@
#include <linux/module.h>
#include <linux/uio.h>
#include <linux/notifier.h>
#include <linux/device.h>
#include <linux/mtd/compatmac.h>
#include <mtd/mtd-abi.h>
@@ -237,6 +238,7 @@ struct mtd_info {
void *priv;
struct module *owner;
struct device dev;
int usecount;
/* If the driver is something smart, like UBI, it may need to maintain
@@ -247,6 +249,11 @@ struct mtd_info {
void (*put_device) (struct mtd_info *mtd);
};
static inline struct mtd_info *dev_to_mtd(struct device *dev)
{
return dev ? container_of(dev, struct mtd_info, dev) : NULL;
}
static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
{
if (mtd->erasesize_shift)