So that callers of cros_ec_cmd_xfer don't have to repeat boilerplate
code when checking for errors from the EC side.
Signed-off-by: Tomeu Vizoso <tomeu.viz...@collabora.com>
---
Changes in v4: None
Changes in v3: None
Changes in v2: None
drivers/platform/chrome/cros_ec_proto.c | 14 ++++++++++++++
include/linux/mfd/cros_ec.h | 18 ++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/drivers/platform/chrome/cros_ec_proto.c
b/drivers/platform/chrome/cros_ec_proto.c
index c792e116e621..e45d6750bbdf 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -472,3 +472,17 @@ int cros_ec_get_next_event(struct cros_ec_device *ec_dev)
return get_keyboard_state_event(ec_dev);
}
EXPORT_SYMBOL(cros_ec_get_next_event);
+
+int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
+ struct cros_ec_command *msg)
+{
+ int ret = cros_ec_cmd_xfer(ec_dev, msg);
+
+ if (ret < 0)
+ dev_err(ec_dev->dev, "Command xfer error (err:%d)\n", ret);
+ else if (msg->result)
+ return -EECRESULT - msg->result;
+
+ return ret;
+}
+EXPORT_SYMBOL(cros_ec_cmd_xfer_status);
diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index 1f88418a36cf..b6961c717209 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -40,6 +40,9 @@
#define EC_MAX_REQUEST_OVERHEAD 1
#define EC_MAX_RESPONSE_OVERHEAD 2
+/* ec_command return value for non-success result from EC */
+#define EECRESULT 1000
+
/*
* Command interface between EC and AP, for LPC, I2C and SPI interfaces.
*/
@@ -250,6 +253,21 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
struct cros_ec_command *msg);
/**
+ * cros_ec_cmd_xfer_status - Send a command to the ChromeOS EC
+ *
+ * This function is identical to cros_ec_cmd_xfer, except it returns succes
+ * status only if both the command was transmitted successfully and the EC
+ * replied with success status. It's not necessary to check msg->result when
+ * using this function.
+ *
+ * @ec_dev: EC device
+ * @msg: Message to write
+ * @return: Num. of bytes transferred on success, <0 on failure
+ */
+int cros_ec_cmd_xfer_status(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.
--
2.5.0
