Subject: [PATCH v4 4/4] iio: humidity: si7020: added No Hold read mode

From: [email-masked] (Lars-Peter Clausen)
Date: Wed, 28 Oct 2015 19:46:19 +0100

On 10/28/2015 07:35 PM, Nicola Corna wrote:
> October 28 2015 10:38 AM, "Lars-Peter Clausen" <[email-masked]> wrote:
> 
>> On 10/28/2015 07:58 AM, Nicola Corna wrote:
>> [...]
>>
>>> + holdmode = !((*client)->adapter->quirks &&
>>> + (*client)->adapter->quirks->flags &
>>
>> [...]
>>
>>> + client->adapter->quirks &&
>>> + client->adapter->quirks->flags & I2C_AQ_NO_CLK_STRETCH)
>>
>> This is rather ugly, can we get a helper in the I2C core something along the
>> lines of
>>
>> i2c_check_quirks(client->adapter, I2C_AQ_NO_CLK_STRETCH)
>>
>> - Lars
> 
> Something like this?
> 
> ---
> diff --git a/include/linux/i2c.h b/include/linux/i2c.h
> index a69a9a0..a06ffc0 100644
> --- a/include/linux/i2c.h
> +++ b/include/linux/i2c.h
> @@ -613,6 +613,12 @@ static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
> return (func & i2c_get_functionality(adap)) == func;
> }
> 
> +/* Return 1 if adapter has the specified quirks, 0 if not. */
> +static inline int i2c_check_quirks(struct i2c_adapter *adap, u64 quirks)
> +{
> + return (quirks & (adap->quirks ? adap->quirks->flags : 0)) == quirks;
> +}

This is not a code obfuscation contest ;)

So maybe more like this:

static inline bool i2c_check_quirks(struct i2c_adapter *adap, u64 quirks)
{
	if (!adap->quirks)
		return false;
	return (adap->quirks->flags & quirks) == quirks;
}

And please use kernel-doc for the documentation.