[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1464399556-17222-2-git-send-email-briannorris@chromium.org>
Date: Fri, 27 May 2016 18:39:13 -0700
From: Brian Norris <briannorris@...omium.org>
To: Lee Jones <lee.jones@...aro.org>,
Thierry Reding <thierry.reding@...il.com>,
Olof Johansson <olof@...om.net>
Cc: <linux-kernel@...r.kernel.org>,
Doug Anderson <dianders@...omium.org>,
Brian Norris <computersforpeace@...il.com>,
linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
Boris Brezillon <boris.brezillon@...e-electrons.com>,
Stephen Barber <smbarber@...omium.org>,
Sameer Nanda <snanda@...omium.org>,
Javier Martinez Canillas <javier@....samsung.com>,
Benson Leung <bleung@...omium.org>,
Enric Balletbo <enric.balletbo@...labora.co.uk>,
Randall Spangler <rspangler@...omium.org>,
Shawn Nematbakhsh <shawnn@...omium.org>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Todd Broch <tbroch@...omium.org>,
Gwendal Grignou <gwendal@...omium.org>,
Tomeu Vizoso <tomeu.vizoso@...labora.com>,
Brian Norris <briannorris@...omium.org>
Subject: [PATCH 1/4] mfd: cros_ec: Add cros_ec_cmd_xfer_status helper
From: Tomeu Vizoso <tomeu.vizoso@...labora.com>
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.vizoso@...labora.com>
Reviewed-by: Benson Leung <bleung@...omium.org>
Signed-off-by: Brian Norris <briannorris@...omium.org>
---
Stolen from:
https://lkml.org/lkml/2016/4/12/342
https://patchwork.kernel.org/patch/8810001/
drivers/platform/chrome/cros_ec_proto.c | 15 +++++++++++++++
include/linux/mfd/cros_ec.h | 18 ++++++++++++++++++
2 files changed, 33 insertions(+)
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 990308ca384f..75eb90d2e4f9 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -380,3 +380,18 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
return ret;
}
EXPORT_SYMBOL(cros_ec_cmd_xfer);
+
+int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
+ struct cros_ec_command *msg)
+{
+ int ret;
+
+ 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 != EC_RES_SUCCESS)
+ 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 a677c2bd485c..b43153f1aca5 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.
*/
@@ -224,6 +227,21 @@ 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.
--
2.8.0.rc3.226.g39d4020
Powered by blists - more mailing lists