[PATCH 4/4] power_supply: bump EC version check that we refuse to run with in olpc_battery

[Andres Salomon <dilinger@queued.net>]

Refuse to run with an EC < 0x44.  We're playing it safe, and this is
a pretty old EC version.

Also, add a comment about why we're checking the EC version.

Signed-off-by: Andres Salomon <dilinger@debian.org>
---
 drivers/power/olpc_battery.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/power/olpc_battery.c b/drivers/power/olpc_battery.c
index cb45a67..086b146 100644
--- a/drivers/power/olpc_battery.c
+++ b/drivers/power/olpc_battery.c
@@ -398,7 +398,12 @@ static int __init olpc_bat_init(void)
 
 	if (!olpc_platform_info.ecver)
 		return -ENXIO;
-	if (olpc_platform_info.ecver < 0x43) {
+
+	/*
+	 * We've seen a number of EC protocol changes; this driver requires
+	 * the latest EC protocol, supported by 0x44 and above.
+	 */
+	if (olpc_platform_info.ecver < 0x44) {
 		printk(KERN_NOTICE "OLPC EC version 0x%02x too old for battery driver.\n", olpc_platform_info.ecver);
 		return -ENXIO;
 	}
-- 
1.5.5