From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Nicola Corna" <nicola@corna.info>
Subject: Re: [PATCH v4 4/4] iio: humidity: si7020: added No Hold read mode
Date: Wed, 28 Oct 2015 20:17:33 +0000
Message-ID: <2701e4d285e40b03220edbfc284832ff@rainloop.corna.info>
References: <563117FB.5030506@metafoo.de> <5630977D.2020102@metafoo.de>
 <f113de76b2369d404909cfc5158feca4@rainloop.corna.info>
 <1446015506-21371-1-git-send-email-nicola@corna.info>
 <aa9c6c7ffdd5083c110cb35723081dbf@rainloop.corna.info>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org>
In-Reply-To: <563117FB.5030506@metafoo.de>
List-Unsubscribe: <http://lists.infradead.org/mailman/options/linux-arm-kernel>,
 <mailto:linux-arm-kernel-request@lists.infradead.org?subject=unsubscribe>
List-Archive: <http://lists.infradead.org/pipermail/linux-arm-kernel/>
List-Post: <mailto:linux-arm-kernel@lists.infradead.org>
List-Help: <mailto:linux-arm-kernel-request@lists.infradead.org?subject=help>
List-Subscribe: <http://lists.infradead.org/mailman/listinfo/linux-arm-kernel>,
 <mailto:linux-arm-kernel-request@lists.infradead.org?subject=subscribe>
Sender: "linux-arm-kernel" <linux-arm-kernel-bounces@lists.infradead.org>
Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org
To: Lars-Peter Clausen <lars@metafoo.de>, Wolfram Sang <wsa@the-dreams.de>, Stephen Warren <swarren@wwwdotorg.org>, Lee Jones <lee@kernel.org>, Eric Anholt <eric@anholt.net>, Jonathan Cameron <jic23@kernel.org>
Cc: linux-iio@vger.kernel.org, Peter Meerwald <pmeerw@pmeerw.net>, linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Hartmut Knaack <knaack.h@gmx.de>
List-Id: linux-i2c@vger.kernel.org

October 28 2015 7:46 PM, "Lars-Peter Clausen" <lars@metafoo.de> wrote:

> On 10/28/2015 07:35 PM, Nicola Corna wrote:
> 
>> October 28 2015 10:38 AM, "Lars-Peter Clausen" <lars@metafoo.de> 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 ;)

I love one-liners ;)

> 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;
> }

Should I use bool (like in your snippet) or int (like i2c_check_functionality) as return type?

> And please use kernel-doc for the documentation.