Let userspace know what the access map for the device is. This is helpful
for verifying that the access map is correctly configured and could also
be useful for programs that try to work with the data. File format is:

register: R W V P

where R, W, V and P are 'y' or 'n' showing readable, writable, volatile
and precious respectively.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

We're going to be using these in quite a few places so factor out the
readable/writable/volatile/precious checks.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

x86_64 size_t is not an int but the printf format specifier for size_t
should be an int.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>

Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Copy over the read parts of the ASoC debugfs implementation into regmap,
allowing users to see what the register values the device has are at
runtime. The implementation, especially the support for seeking, is
mostly due to Dimitris Papastamos' work in ASoC.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>