Commit b8f5fe3b authored by Heiner Kallweit's avatar Heiner Kallweit Committed by Wolfram Sang
Browse files

i2c: core: add device-managed version of i2c_new_dummy

i2c_new_dummy is typically called from the probe function of the
driver for the primary i2c client. It requires calls to
i2c_unregister_device in the error path of the probe function and
in the remove function.
This can be simplified by introducing a device-managed version.

Note the changed error case return value type: i2c_new_dummy returns
NULL whilst devm_i2c_new_dummy_device returns an ERR_PTR.
Signed-off-by: default avatarHeiner Kallweit <>
[wsa: rename new functions and fix minor kdoc issues]
Signed-off-by: default avatarWolfram Sang <>
Reviewed-by: default avatarPeter Rosin <>
Reviewed-by: default avatarKieran Bingham <>
Reviewed-by: default avatarBartosz Golaszewski <>
Signed-off-by: default avatarWolfram Sang <>
parent 7159dbda
......@@ -271,6 +271,9 @@ GPIO
......@@ -929,6 +929,50 @@ struct i2c_client *i2c_new_dummy(struct i2c_adapter *adapter, u16 address)
struct i2c_dummy_devres {
struct i2c_client *client;
static void devm_i2c_release_dummy(struct device *dev, void *res)
struct i2c_dummy_devres *this = res;
* devm_i2c_new_dummy_device - return a new i2c device bound to a dummy driver
* @dev: device the managed resource is bound to
* @adapter: the adapter managing the device
* @address: seven bit address to be used
* Context: can sleep
* This is the device-managed version of @i2c_new_dummy_device. It returns the
* new i2c client or an ERR_PTR in case of an error.
struct i2c_client *devm_i2c_new_dummy_device(struct device *dev,
struct i2c_adapter *adapter,
u16 address)
struct i2c_dummy_devres *dr;
struct i2c_client *client;
dr = devres_alloc(devm_i2c_release_dummy, sizeof(*dr), GFP_KERNEL);
if (!dr)
return ERR_PTR(-ENOMEM);
client = i2c_new_dummy_device(adapter, address);
if (IS_ERR(client)) {
} else {
dr->client = client;
devres_add(dev, dr);
return client;
* i2c_new_secondary_device - Helper to get the instantiated secondary address
* and create the associated device
......@@ -469,6 +469,9 @@ extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr);
extern struct i2c_client *
i2c_new_dummy(struct i2c_adapter *adap, u16 address);
extern struct i2c_client *
devm_i2c_new_dummy_device(struct device *dev, struct i2c_adapter *adap, u16 address);
extern struct i2c_client *
i2c_new_secondary_device(struct i2c_client *client,
const char *name,
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