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    • Jean Delvare's avatar
      i2c: Add SMBus alert support · b5527a77
      Jean Delvare authored
      SMBus alert support. The SMBus alert protocol allows several SMBus
      slave devices to share a single interrupt pin on the SMBus master,
      while still allowing the master to know which slave triggered the
      interrupt.
      
      This is based on preliminary work by David Brownell. The key
      difference between David's implementation and mine is that his was
      part of i2c-core, while mine is split into a separate, standalone
      module named i2c-smbus. The i2c-smbus module is meant to include
      support for all SMBus extensions to the I2C protocol in the future.
      
      The benefit of this approach is a zero cost for I2C bus segments which
      do not need SMBus alert support. Where David's implementation
      increased the size of struct i2c_adapter by 7% (40 bytes on i386),
      mine doesn't touch it. Where David's implementation added over 150
      lines of code to i2c-core (+10%), mine doesn't touch it. The only
      change that touches all the users of the i2c subsystem is a new
      callback in struct i2c_driver (common to both implementations.) I seem
      to remember Trent was worried about the footprint of David'd
      implementation, hopefully mine addresses the issue.
      Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      Acked-by: default avatarJonathan Cameron <jic23@cam.ac.uk>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Trent Piepho <tpiepho@freescale.com>
      b5527a77