linux-kernel - [PATCH] i2c: cros_ec: Remove EC_I2C_FLAG

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Date:	Mon, 23 Jun 2014 14:20:06 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	Lee Jones <lee.jones@...aro.org>, Dave Jones <davej@...hat.com>,
	rspangler@...omium.org, sjg@...omium.org,
	Doug Anderson <dianders@...omium.org>, sameo@...ux.intel.com,
	wfrichar@...omium.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] i2c: cros_ec: Remove EC_I2C_FLAG_10BIT

In <https://lkml.org/lkml/2014/6/10/265> pointed out that the 10-bit
flag in the cros_ec_tunnel was useless.  It went into a 16-bit flags
field but was defined at (1 << 16).

Since we have no 10-bit i2c devices on the other side of the tunnel on
any known devices this was never a problem.  Until we do it makes
sense to remove this code.  On the EC side the code to handle this
flag was removed in <https://chromium-review.googlesource.com/204162>.

Reported-by: Dave Jones <davej@...hat.com>
Signed-off-by: Doug Anderson <dianders@...omium.org>
---
Note that this patch is based atop my current series of posts to
cleanup cros_ec.  It wouldn't be hard to apply it to the current ToT
if someone wants to land this before the others.

 drivers/i2c/busses/i2c-cros-ec-tunnel.c | 6 ++++--
 include/linux/mfd/cros_ec_commands.h    | 3 ---
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/busses/i2c-cros-ec-tunnel.c b/drivers/i2c/busses/i2c-cros-ec-tunnel.c
index 05e033c..6d7d009 100644
--- a/drivers/i2c/busses/i2c-cros-ec-tunnel.c
+++ b/drivers/i2c/busses/i2c-cros-ec-tunnel.c
@@ -94,7 +94,7 @@ static int ec_i2c_construct_message(u8 *buf, const struct i2c_msg i2c_msgs[],
 		msg->addr_flags = i2c_msg->addr;
 
 		if (i2c_msg->flags & I2C_M_TEN)
-			msg->addr_flags |= EC_I2C_FLAG_10BIT;
+			return -EINVAL;
 
 		if (i2c_msg->flags & I2C_M_RD) {
 			msg->addr_flags |= EC_I2C_FLAG_READ;
@@ -218,7 +218,9 @@ static int ec_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg i2c_msgs[],
 		}
 	}
 
-	ec_i2c_construct_message(request, i2c_msgs, num, bus_num);
+	result = ec_i2c_construct_message(request, i2c_msgs, num, bus_num);
+	if (result)
+		goto exit;
 
 	msg.version = 0;
 	msg.command = EC_CMD_I2C_PASSTHRU;
diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
index 7853a64..a49cd41 100644
--- a/include/linux/mfd/cros_ec_commands.h
+++ b/include/linux/mfd/cros_ec_commands.h
@@ -1928,9 +1928,6 @@ struct ec_response_power_info {
 
 #define EC_CMD_I2C_PASSTHRU 0x9e
 
-/* Slave address is 10 (not 7) bit */
-#define EC_I2C_FLAG_10BIT	(1 << 16)
-
 /* Read data; if not present, message is a write */
 #define EC_I2C_FLAG_READ	(1 << 15)
 
-- 
2.0.0.526.g5318336

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