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authorNick Crews <ncrews@chromium.org>2019-02-09 03:37:18 +0300
committerEnric Balletbo i Serra <enric.balletbo@collabora.com>2019-02-21 23:36:21 +0300
commitb787bb126cbcd73754bcbc055ae9f804ac576e4a (patch)
tree3c8d4173614ddfddbbe4ea0d6904c974a7c5a704 /Documentation/ABI
parent7b3d4f44abf0e7a1ba762c8a9c99a8b39ee0c8b1 (diff)
downloadlinux-b787bb126cbcd73754bcbc055ae9f804ac576e4a.tar.xz
platform/chrome: wilco_ec: Add support for raw commands in debugfs
Add a debugfs attribute that allows sending raw commands to the EC. This is useful for development and debug but should not be enabled in a production environment. To test: Get the EC firmware build date First send the request command > echo 00 f0 38 00 03 00 > raw Then read the result. "12/21/18" is in the middle of the response > cat raw 00 31 32 2f 32 31 2f 31 38 00 00 0f 01 00 01 00 .12/21/18....... Get the EC firmware build date First send the request command > echo 00 f0 38 00 03 00 > raw Then read the result. "12/21/18" is in the middle of the response > cat raw 00 31 32 2f 32 31 2f 31 38 00 00 0f 01 00 01 00 .12/21/18....... Signed-off-by: Duncan Laurie <dlaurie@google.com> Signed-off-by: Nick Crews <ncrews@chromium.org> [Fix off-by-one error in wilco_ec/debugfs.c] Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Diffstat (limited to 'Documentation/ABI')
-rw-r--r--Documentation/ABI/testing/debugfs-wilco-ec23
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/debugfs-wilco-ec b/Documentation/ABI/testing/debugfs-wilco-ec
new file mode 100644
index 000000000000..f814f112e213
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+++ b/Documentation/ABI/testing/debugfs-wilco-ec
@@ -0,0 +1,23 @@
+What: /sys/kernel/debug/wilco_ec/raw
+Date: January 2019
+KernelVersion: 5.1
+Description:
+ Write and read raw mailbox commands to the EC.
+
+ For writing:
+ Bytes 0-1 indicate the message type:
+ 00 F0 = Execute Legacy Command
+ 00 F2 = Read/Write NVRAM Property
+ Byte 2 provides the command code
+ Bytes 3+ consist of the data passed in the request
+
+ At least three bytes are required, for the msg type and command,
+ with additional bytes optional for additional data.
+
+ Example:
+ // Request EC info type 3 (EC firmware build date)
+ $ echo 00 f0 38 00 03 00 > raw
+ // View the result. The decoded ASCII result "12/21/18" is
+ // included after the raw hex.
+ $ cat raw
+ 00 31 32 2f 32 31 2f 31 38 00 38 00 01 00 2f 00 .12/21/18.8...