Hello Bill, On 11/20/2014 07:16 PM, Bill Richardson wrote: >> >> I don't really know why there are two interfaces for this but I guess >> that different user-space utilities use one or another. Maybe the >> ChromiumOS folks can comment on this. > > The /dev/cros_ec interface responds to ioctls and is the primary means > by which userspace applications talk to the EC (replacing three really > awkward bus-specific libraries). It emits a simplified version string > when read so that humans can tell if the EC is alive and speaking the > same protocol that the userspace app expects. > > The /sys/class/chromeos/cros_ec/* tree was originally envisioned as a > way to provide additional human-readable interfaces to a subset of the > EC commands, but except for the lightbar it's not often used. The > version component here shows all the version-related info that the EC > can provide. >
Got it, thanks a lot for the explanation. Best regards, Javier -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
