From 8c9312a925ad859daefd0f443ef3b6dc7157d881 Mon Sep 17 00:00:00 2001
From: Wolfram Sang <wsa+renesas@sang-engineering.com>
Date: Wed, 6 Nov 2019 22:21:01 +0100
Subject: i2c: add helper to check if a client has a driver attached
Git-commit: 8c9312a925ad859daefd0f443ef3b6dc7157d881
Patch-mainline: v5.5-rc2
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322

As a preparation for an API conversion, factor out something frequently
used in the media subsystem. As an improvement, it bails out on both,
NULL and ERRPTR to handle the old and new API.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 include/linux/i2c.h |    5 +++++
 1 file changed, 5 insertions(+)

--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -847,6 +847,11 @@ extern void i2c_del_driver(struct i2c_dr
 extern struct i2c_client *i2c_use_client(struct i2c_client *client);
 extern void i2c_release_client(struct i2c_client *client);
 
+static inline bool i2c_client_has_driver(struct i2c_client *client)
+{
+	return !IS_ERR_OR_NULL(client) && client->dev.driver;
+}
+
 /* call the i2c_client->command() of all attached clients with
  * the given arguments */
 extern void i2c_clients_command(struct i2c_adapter *adap,