mfd: cros_ec: Check result code from EC messages

Just because the host was able to talk to the EC doesn't mean that the EC
was happy with what it was told. Errors in communincation are not the same
as error messages from the EC itself.

This change lets the EC report its errors separately.

[dianders: Added common function to cros_ec.c]

Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index 60c088055f3a..1f79f162abe4 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -143,6 +143,18 @@ int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
                        struct cros_ec_command *msg);
 
 /**
+ * cros_ec_check_result - Check ec_msg->result
+ *
+ * This is used by ChromeOS EC drivers to check the ec_msg->result for
+ * errors and to warn about them.
+ *
+ * @ec_dev: EC device
+ * @msg: Message to check
+ */
+int cros_ec_check_result(struct cros_ec_device *ec_dev,
+                         struct cros_ec_command *msg);
+
+/**
  * cros_ec_remove - Remove a ChromeOS EC
  *
  * Call this to deregister a ChromeOS EC, then clean up any private data.