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i2c: core: add device-managed version of i2c_new_dummy

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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: Heiner Kallweit <hkallweit1@gmail.com>
[wsa: rename new functions and fix minor kdoc issues]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Heiner Kallweit 2019-05-16 23:13:09 +02:00 committed by Wolfram Sang
parent 7159dbdae3
commit b8f5fe3bc5
3 changed files with 50 additions and 0 deletions
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3
Documentation/driver-model/devres.txt
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@ -271,6 +271,9 @@ GPIO
devm_gpio_request_one() devm_gpio_request_one()
devm_gpio_free() devm_gpio_free()
I2C
devm_i2c_new_dummy_device()
IIO IIO
devm_iio_device_alloc() devm_iio_device_alloc()
devm_iio_device_free() devm_iio_device_free()

44
drivers/i2c/i2c-core-base.c
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@ -929,6 +929,50 @@ struct i2c_client *i2c_new_dummy(struct i2c_adapter *adapter, u16 address)
} }
EXPORT_SYMBOL_GPL(i2c_new_dummy); EXPORT_SYMBOL_GPL(i2c_new_dummy);
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;
i2c_unregister_device(this->client);
}
/**
* 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)) {
devres_free(dr);
} else {
dr->client = client;
devres_add(dev, dr);
}
return client;
}
EXPORT_SYMBOL_GPL(devm_i2c_new_dummy_device);
/** /**
* i2c_new_secondary_device - Helper to get the instantiated secondary address * i2c_new_secondary_device - Helper to get the instantiated secondary address
* and create the associated device * and create the associated device

3
include/linux/i2c.h
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@ -469,6 +469,9 @@ extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr);
extern struct i2c_client * extern struct i2c_client *
i2c_new_dummy(struct i2c_adapter *adap, u16 address); 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 * extern struct i2c_client *
i2c_new_secondary_device(struct i2c_client *client, i2c_new_secondary_device(struct i2c_client *client,
const char *name, const char *name,