linux-kernel - [PATCH 4.9 091/310] leds: pca955x: Correct I2C Functionality

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Date:   Wed, 11 Apr 2018 20:33:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tin Huynh <tnhuynh@....com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 091/310] leds: pca955x: Correct I2C Functionality

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tin Huynh <tnhuynh@....com>


[ Upstream commit aace34c0bb8ea3c8bdcec865b6a4be4db0a68e33 ]

The driver checks an incorrect flag of functionality of adapter.
When a driver requires i2c_smbus_read_byte_data and
i2c_smbus_write_byte_data, it should check I2C_FUNC_SMBUS_BYTE_DATA
instead I2C_FUNC_I2C.
This patch fixes the problem.

Signed-off-by: Tin Huynh <tnhuynh@....com>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@...il.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/leds/leds-pca955x.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/leds/leds-pca955x.c
+++ b/drivers/leds/leds-pca955x.c
@@ -266,7 +266,7 @@ static int pca955x_probe(struct i2c_clie
 			"slave address 0x%02x\n",
 			id->name, chip->bits, client->addr);
 
-	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 		return -EIO;
 
 	if (pdata) {