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: [PATCH] i2c: add helper to check if a client has a driver attached
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>
---
include/linux/i2c.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 91954324f985e..582ef05ec07ed 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -851,6 +851,11 @@ extern void i2c_del_driver(struct i2c_driver *driver);
#define i2c_add_driver(driver) \
i2c_register_driver(THIS_MODULE, driver)
+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,
--
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