Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fix typo in comment.

Add two new flags (IIC_M_NOSTOP and IIC_M_NOSTART) to struct iic_msg to
allow consumers of iicbus_transfer() to send messages with repeated starts.

Reviewed by: imp

Teach iic(4) the 'repeated start' I2C condition. This will be used by the
upcoming i2c(8) diag utility.

Reviewed by: bms, stas
Obtained from: Semihalf

Add a fake flag for write. Many drivers have started to use it and it
seems like a good idea.

Submitted by: sam

Allow iic bridges to support a generalized transfer, rather than
forcing all transfers to do the start read/write stop by hand. Some
smart bridges prefer this sort of operation, and this allows us to
support their features more easily. When bridges don't support it, we
fall back to using the old-style opertaions. Expand the ioctl
interface to expose this function. Unlike the old-style interface,
this interface is thread safe, even on old bridges.

$Id$ -> $FreeBSD$

Change /dev/smb and /dev/iic interface to allow user programs to interact with
devices dynamically. That means,

+ only one /dev/iic or /dev/smb device for each smb/iic bus to access
+ I2C/SMB device address must be given to any ioctl
+ new devices may be plugged and accessed after boot, which was
impossible previously (device addresses were hardcoded into
the kernel)

Reviewed by: Doug Rabson
Submitted by: nsouch
I2C and SMB ioctls