[PATCH powerd 2/2] fall back to device tree if olpc-hwinfo is unavailable

[Sascha Silbe]

olpc-hwinfo is shipped as part of olpc-utils, which does a lot of
changes to the system that are not suitable for most systems other
than XOs running OLPC OS. olpc-hwinfo will still be used if available,
but in addition to reading the DMI information (only available on x86,
i.e. on XO-1 and XO-1.5) we now check the device tree (if available),
thereby adding XO-1.75 support.

Signed-off-by: Sascha Silbe <silbe at activitycentral.com>
---
 powerd |   25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/powerd b/powerd
index c6d9487..028e666 100755
--- a/powerd
+++ b/powerd
@@ -793,6 +793,31 @@ read_hwinfo()
         hwversion=$(olpc-hwinfo model)
         return
     fi
+    if [ -r /proc/device-tree/banner-name ]
+    then
+        case "$(</proc/device-tree/banner-name)" in
+        OLPC\ *)
+            hwvendor=OLPC
+            hwname=XO
+            ;;&
+        OLPC\ [BC][0-9])
+            hwversion=1
+            return
+            ;;
+        OLPC\ D[0-9])
+            hwversion=1.5
+            return
+            ;;
+        OLPC\ 1[ABC][0-9])
+            hwversion=1.75
+            return
+            ;;
+        OLPC\ 2[ABC][0-9])
+            hwversion=3
+            return
+            ;;
+        esac
+    fi
     read hwvendor < /sys/class/dmi/id/sys_vendor ||
         hwvendor="n/a"
     read hwname < /sys/class/dmi/id/product_name ||
-- 
1.7.10