linux-kernel - [PATCH 10/10] mfd: cros_ec: ec_dev->cmd_xfer() returns number of bytes received from EC

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Message-Id: <1402954800-28215-11-git-send-email-dianders@chromium.org>
Date:	Mon, 16 Jun 2014 14:40:00 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Andrew Bresticker <abrestic@...omium.org>, swarren@...dotorg.org,
	olof@...om.net, Sonny Rao <sonnyrao@...omium.org>,
	linux-samsung-soc@...r.kernel.org,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Bill Richardson <wfrichar@...omium.org>, sjg@...omium.org,
	Wolfram Sang <wsa@...-dreams.de>, broonie@...nel.org,
	Doug Anderson <dianders@...omium.org>, sameo@...ux.intel.com,
	vpalatin@...omium.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 10/10] mfd: cros_ec: ec_dev->cmd_xfer() returns number of bytes received from EC

From: Bill Richardson <wfrichar@...omium.org>

When communicating with the EC, the cmd_xfer() function should return the
number of bytes it received from the EC, or negative on error.

Signed-off-by: Bill Richardson <wfrichar@...omium.org>
Signed-off-by: Doug Anderson <dianders@...omium.org>
---
 drivers/i2c/busses/i2c-cros-ec-tunnel.c | 2 +-
 drivers/mfd/cros_ec_i2c.c               | 2 +-
 drivers/mfd/cros_ec_spi.c               | 2 +-
 include/linux/mfd/cros_ec.h             | 8 ++++----
 4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-cros-ec-tunnel.c b/drivers/i2c/busses/i2c-cros-ec-tunnel.c
index dd07818..05e033c 100644
--- a/drivers/i2c/busses/i2c-cros-ec-tunnel.c
+++ b/drivers/i2c/busses/i2c-cros-ec-tunnel.c
@@ -228,7 +228,7 @@ static int ec_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg i2c_msgs[],
 	msg.insize = response_len;
 
 	result = bus->ec->cmd_xfer(bus->ec, &msg);
-	if (result)
+	if (result < 0)
 		goto exit;
 
 	result = ec_i2c_parse_response(response, i2c_msgs, &num);
diff --git a/drivers/mfd/cros_ec_i2c.c b/drivers/mfd/cros_ec_i2c.c
index 2276096..dc0ba29 100644
--- a/drivers/mfd/cros_ec_i2c.c
+++ b/drivers/mfd/cros_ec_i2c.c
@@ -120,7 +120,7 @@ static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev,
 		goto done;
 	}
 
-	ret = 0;
+	ret = i2c_msg[1].buf[1];
  done:
 	kfree(in_buf);
 	kfree(out_buf);
diff --git a/drivers/mfd/cros_ec_spi.c b/drivers/mfd/cros_ec_spi.c
index 4d34f1c..beba1bc 100644
--- a/drivers/mfd/cros_ec_spi.c
+++ b/drivers/mfd/cros_ec_spi.c
@@ -333,7 +333,7 @@ static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev,
 		goto exit;
 	}
 
-	ret = 0;
+	ret = len;
 exit:
 	mutex_unlock(&ec_spi->lock);
 	return ret;
diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index 60c0880..7b65a75 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -41,7 +41,7 @@ enum {
  * @outdata: Outgoing data to EC
  * @outsize: Outgoing length in bytes
  * @indata: Where to put the incoming data from EC
- * @insize: Incoming length in bytes (filled in by EC)
+ * @insize: Max number of bytes to accept from EC
  * @result: EC's response to the command (separate from communication failure)
  */
 struct cros_ec_command {
@@ -64,9 +64,9 @@ struct cros_ec_command {
  * sleep at the last suspend
  * @event_notifier: interrupt event notifier for transport devices
  * @cmd_xfer: send command to EC and get response
- *     Returns 0 if the communication succeeded, but that doesn't mean the EC
- *     was happy with the command it got. Caller should check msg.result for
- *     the EC's result code.
+ *     Returns the number of bytes received if the communication succeeded, but
+ *     that doesn't mean the EC was happy with the command. The caller
+ *     should check msg.result for the EC's result code.
  *
  * @priv: Private data
  * @irq: Interrupt to use
-- 
2.0.0.526.g5318336

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