linux-toradex.git/include/linux/i2c.h, branch v2.6.32.9

i2c: Add an interface to lock/unlock an I2C bus segment

2009-11-07T12:10:46+00:00

Some drivers need to be able to prevent access to an I2C bus segment
for a specific period of time. Add an interface for them to do so
without twiddling with i2c-core internals.

Signed-off-by: Jean Delvare 
Acked-by: Ben Hutchings

i2c: Drop unused i2c_driver.id field

2009-09-18T20:45:43+00:00

Nobody is using i2c_driver.id any longer, so we can drop that field.

Signed-off-by: Jean Delvare

i2c: New macro to initialize i2c address lists on the fly

2009-06-19T14:58:21+00:00

For video4linux we sometimes need to probe for a single i2c address.
Normally you would do it like this:

static const unsigned short addrs[] = {
	addr, I2C_CLIENT_END
};

client = i2c_new_probed_device(adapter, &info, addrs);

This is a bit awkward and I came up with this macro:

#define V4L2_I2C_ADDRS(addr, addrs...) \
	((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END })

This can construct a list of one or more i2c addresses on the fly. But
this is something that really belongs in i2c.h, renamed to I2C_ADDRS.

With this macro we can just do:

client = i2c_new_probed_device(adapter, &info, I2C_ADDRS(addr));

Note that this can also be used to initialize an array:

static const unsigned short addrs[] = I2C_ADDRS(0x2a, 0x2c);

Whether you want to is another matter, but it works. This functionality is 
also available in the oldest supported gcc (3.2).

Signed-off-by: Hans Verkuil 
Signed-off-by: Jean Delvare

i2c: Don't advertise i2c functions when not available

2009-06-19T14:58:20+00:00

Surround i2c function declarations with ifdefs, so that they aren't
advertised when i2c-core isn't actually built. That way, drivers using
these functions unconditionally will result in an immediate build
failure, rather than a late linking failure which is harder to figure
out.

Signed-off-by: Jean Delvare 
Cc: Mark Brown 
Cc: Paul Mundt

i2c: Add a sysfs interface to instantiate devices

2009-06-19T14:58:20+00:00

Add a sysfs interface to instantiate and delete I2C devices. This is
primarily a replacement of the force_* module parameters implemented
by some i2c drivers. These module parameters were implemented
internally by the I2C_CLIENT_INSMOD* macros, which don't scale well.

This can also be used when developing a driver on a self-soldered
board which doesn't yet have proper I2C device declaration at the
platform level, and presumably for various debugging situations.

Signed-off-by: Jean Delvare 
Cc: David Brownell

i2c: Kill the redundant client list

2009-06-19T14:58:19+00:00

We used to maintain our own per-adapter list of i2c clients, but this
is redundant with what the driver core does, and no longer needed.
Just drop the redundant list.

Signed-off-by: Jean Delvare 
Cc: David Brownell

i2c: Kill is_newstyle_driver

2009-06-19T14:58:19+00:00

Legacy i2c drivers are gone, all drivers are new-style now, so there
is no point to check.

Signed-off-by: Jean Delvare 
Cc: David Brownell

i2c: Drop i2c_probe function

2009-06-19T14:58:18+00:00

The legacy i2c_probe() function has no users left, get rid of it.

Signed-off-by: Jean Delvare 
Cc: David Brownell

i2c: Get rid of the legacy binding model

2009-06-19T14:58:18+00:00

We converted all the legacy i2c drivers so we can finally get rid of
the legacy binding model. Hooray!

Signed-off-by: Jean Delvare 
Cc: David Brownell

i2c: Kill client_register and client_unregister methods

2009-06-19T14:58:17+00:00

These methods were useful in the legacy binding model but no longer in
the new (standard) binding model. There are no users left so we can
drop them.

Signed-off-by: Jean Delvare 
Cc: David Brownell