Am 15.12.2017 um 23:02 schrieb Bartosz Golaszewski:
> 2017-12-15 18:43 GMT+01:00 Heiner Kallweit <hkallweit1@xxxxxxxxx>:
>> Currently i2c_new_device and i2c_new_dummy return just NULL in error
>> case although they have more error details internally. Therefore move
>> the functionality into new functions returning detailed errors and
>> add wrappers for compatibilty with the current API.
>>
>> This allows to use these functions with detailed error codes within
>> the i2c core or for API extensions.
>>
>> Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
>> Reviewed-by: Bartosz Golaszewski <brgl@xxxxxxxx>
>
> Hi Heiner,
>
> I only Reviewed-by this patch, not the whole series. I always
> explicitly state it if I do. Patch 3/3 looks good but since it's at24,
> it's probably going to go through my tree anyway (possibly with the
> rest of this series), so no need for the tag.
>
Sorry, I misunderstood you here.
>> ---
>> v3:
>> - prefix i2c_new_device and i2c_new_dummy with two underscores
>> instead one
>> v4:
>> - add missing kernel doc
>> - add reviewed-by
>> ---
>> drivers/i2c/i2c-core-base.c | 70 ++++++++++++++++++++++++++++++++++++---------
>> 1 file changed, 57 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
>> index bb34a5d41..3b962456c 100644
>> --- a/drivers/i2c/i2c-core-base.c
>> +++ b/drivers/i2c/i2c-core-base.c
>> @@ -656,7 +656,7 @@ static int i2c_dev_irq_from_resources(const struct resource *resources,
>> }
>>
>> /**
>> - * i2c_new_device - instantiate an i2c device
>> + * __i2c_new_device - instantiate an i2c device
>> * @adap: the adapter managing the device
>> * @info: describes one I2C device; bus_num is ignored
>> * Context: can sleep
>> @@ -669,17 +669,17 @@ static int i2c_dev_irq_from_resources(const struct resource *resources,
>> * before any i2c_adapter could exist.
>> *
>> * This returns the new i2c client, which may be saved for later use with
>> - * i2c_unregister_device(); or NULL to indicate an error.
>> + * i2c_unregister_device(); or an ERR_PTR to indicate an error.
>> */
>> -struct i2c_client *
>> -i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
>> +static struct i2c_client *
>> +__i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
>> {
>> struct i2c_client *client;
>> int status;
>>
>> client = kzalloc(sizeof *client, GFP_KERNEL);
>> if (!client)
>> - return NULL;
>> + return ERR_PTR(-ENOMEM);
>>
>> client->adapter = adap;
>>
>> @@ -746,7 +746,29 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
>> client->name, client->addr, status);
>> out_err_silent:
>> kfree(client);
>> - return NULL;
>> + return ERR_PTR(status);
>> +}
>> +
>> +/**
>> + * i2c_new_device - instantiate an i2c device
>> + * @adap: the adapter managing the device
>> + * @info: describes one I2C device; bus_num is ignored
>> + * Context: can sleep
>> + *
>> + * This function has the same functionality like __i2_new_device, it just
>> + * returns NULL instead of an ERR_PTR in case of an error for compatibility
>> + * with current I2C API.
>> + *
>> + * This returns the new i2c client, which may be saved for later use with
>> + * i2c_unregister_device(); or NULL to indicate an error.
>> + */
>> +struct i2c_client *
>> +i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
>> +{
>> + struct i2c_client *ret;
>> +
>> + ret = __i2c_new_device(adap, info);
>> + return IS_ERR(ret) ? NULL : ret;
>> }
>> EXPORT_SYMBOL_GPL(i2c_new_device);
>>
>> @@ -793,7 +815,7 @@ static struct i2c_driver dummy_driver = {
>> };
>>
>> /**
>> - * i2c_new_dummy - return a new i2c device bound to a dummy driver
>> + * __i2c_new_dummy - return a new i2c device bound to a dummy driver
>> * @adapter: the adapter managing the device
>> * @address: seven bit address to be used
>> * Context: can sleep
>> @@ -808,15 +830,37 @@ static struct i2c_driver dummy_driver = {
>> * different driver.
>> *
>> * This returns the new i2c client, which should be saved for later use with
>> - * i2c_unregister_device(); or NULL to indicate an error.
>> + * i2c_unregister_device(); or an ERR_PTR to indicate an error.
>> */
>> -struct i2c_client *i2c_new_dummy(struct i2c_adapter *adapter, u16 address)
>> +static struct i2c_client *
>> +__i2c_new_dummy(struct i2c_adapter *adapter, u16 address)
>> {
>> struct i2c_board_info info = {
>> I2C_BOARD_INFO("dummy", address),
>> };
>>
>> - return i2c_new_device(adapter, &info);
>> + return __i2c_new_device(adapter, &info);
>> +}
>> +
>> +/**
>> + * i2c_new_dummy - return a new i2c device bound to a dummy driver
>> + * @adapter: the adapter managing the device
>> + * @address: seven bit address to be used
>> + * Context: can sleep
>> + *
>> + * This function has the same functionality like __i2_new_dummy, it just
>> + * returns NULL instead of an ERR_PTR in case of an error for compatibility
>> + * with current I2C API.
>> + *
>> + * This returns the new i2c client, which should be saved for later use with
>> + * i2c_unregister_device(); or an ERR_PTR to indicate an error.
>
> You're contradicting the previous paragraph here.
>
Right, copy & paste error ..
> Thanks,
> Bartosz
>
>> + */
>> +struct i2c_client *i2c_new_dummy(struct i2c_adapter *adapter, u16 address)
>> +{
>> + struct i2c_client *ret;
>> +
>> + ret = __i2c_new_dummy(adapter, address);
>> + return IS_ERR(ret) ? NULL : ret;
>> }
>> EXPORT_SYMBOL_GPL(i2c_new_dummy);
>>
>> @@ -939,9 +983,9 @@ i2c_sysfs_new_device(struct device *dev, struct device_attribute *attr,
>> info.flags |= I2C_CLIENT_SLAVE;
>> }
>>
>> - client = i2c_new_device(adap, &info);
>> - if (!client)
>> - return -EINVAL;
>> + client = __i2c_new_device(adap, &info);
>> + if (IS_ERR(client))
>> + return PTR_ERR(client);
>>
>> /* Keep track of the added device */
>> mutex_lock(&adap->userspace_clients_lock);
>> --
>> 2.15.1
>>
>>
>
