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  1. 20 6月, 2009 33 次提交
  3. 19 6月, 2009 7 次提交
    • H
      i2c: New macro to initialize i2c address lists on the fly · c7036673
      由 Hans Verkuil 提交于 
      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: NHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: NJean Delvare <khali@linux-fr.org>
      c7036673
    • J
      i2c: Don't advertise i2c functions when not available · 23af8400
      由 Jean Delvare 提交于 
      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: NJean Delvare <khali@linux-fr.org>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Paul Mundt <lethal@linux-sh.org>
      23af8400
    • R
      i2c: Use rwsem instead of mutex for board info · f18c41da
      由 Rodolfo Giometti 提交于 
      By using rwsem we can easily manage recursive calls of
i2c_scan_static_board_info() function without breaking the locking.
Signed-off-by: NRodolfo Giometti <giometti@linux.it>
Signed-off-by: NJean Delvare <khali@linux-fr.org>
      f18c41da
    • J
      i2c: Add a sysfs interface to instantiate devices · 99cd8e25
      由 Jean Delvare 提交于 
      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: NJean Delvare <khali@linux-fr.org>
Cc: David Brownell <dbrownell@users.sourceforge.net>
      99cd8e25
    • J
      i2c: Limit core locking to the necessary sections · 35fc37f8
      由 Jean Delvare 提交于 
      The i2c-core code tends to hold the core lock for longer than it
should. Limit locking to the necessary sections for both performance
and clarity. This is also a requirement to support I2C multiplexers in
the future.
Signed-off-by: NJean Delvare <khali@linux-fr.org>
Tested-by: NRodolfo Giometti <giometti@linux.it>
Cc: David Brownell <dbrownell@users.sourceforge.net>
      35fc37f8
    • J
      i2c: Kill the redundant client list · e549c2b5
      由 Jean Delvare 提交于 
      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: NJean Delvare <khali@linux-fr.org>
Cc: David Brownell <dbrownell@users.sourceforge.net>
      e549c2b5
    • J
      i2c: Kill is_newstyle_driver · 1e40ac12
      由 Jean Delvare 提交于 
      Legacy i2c drivers are gone, all drivers are new-style now, so there
is no point to check.
Signed-off-by: NJean Delvare <khali@linux-fr.org>
Cc: David Brownell <dbrownell@users.sourceforge.net>
      1e40ac12