linux-kernel - [PATCH 3/4] Input: synaptics-rmi4

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Date:	Thu,  9 Jan 2014 23:44:26 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Christopher Heiny <cheiny@...aptics.com>
Cc:	Andrew Duggan <aduggan@...aptics.com>,
	Vincent Huang <vincent.huang@...synaptics.com>,
	Vivian Ly <vly@...aptics.com>,
	Daniel Rosenberg <daniel.rosenberg@...aptics.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Linux Input <linux-input@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/4] Input: synaptics-rmi4 - fix I2C functionality check

When adapter does not support required functionality (I2C_FUNC_I2C) we were
returning 0 to the upper layers, making them believe that device bound
successfully.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/input/rmi4/rmi_i2c.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/input/rmi4/rmi_i2c.c b/drivers/input/rmi4/rmi_i2c.c
index cdc8527..c176218 100644
--- a/drivers/input/rmi4/rmi_i2c.c
+++ b/drivers/input/rmi4/rmi_i2c.c
@@ -193,11 +193,10 @@ static int rmi_i2c_probe(struct i2c_client *client,
 		pdata->sensor_name ? pdata->sensor_name : "-no name-",
 		client->addr, pdata->attn_gpio);
 
-	retval = i2c_check_functionality(client->adapter, I2C_FUNC_I2C);
-	if (!retval) {
-		dev_err(&client->dev, "i2c_check_functionality error %d.\n",
-			retval);
-		return retval;
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(&client->dev,
+			"adapter does not support required functionality.\n");
+		return -ENODEV;
 	}
 
 	if (pdata->gpio_config) {
-- 
1.8.4.2

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