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i2c: add helper to check if a client has a driver attached

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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>
This commit is contained in:
Wolfram Sang 2019-11-06 22:21:01 +01:00 committed by Wolfram Sang
parent 3ac6125859
commit 8c9312a925
1 changed files with 5 additions and 0 deletions
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5
include/linux/i2c.h
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@ -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,