linux-kernel - Re: [PATCH] i2c-designware: Intel BayTrail PMIC I2C bus support

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Date:	Wed, 17 Sep 2014 12:02:02 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	"David E. Box" <david.e.box@...ux.intel.com>
Cc:	wsa@...-dreams.de, jdelvare@...e.de, arnd@...db.de,
	dianders@...omium.org, sjg@...omium.org,
	laurent.pinchart+renesas@...asonboard.com,
	u.kleine-koenig@...gutronix.de, boris.brezillon@...e-electrons.com,
	maxime.coquelin@...com, max.schwarz@...ine.de,
	schwidefsky@...ibm.com, iivanov@...sol.com,
	jacob.jun.pan@...ux.intel.com, soren.brinkmann@...inx.com,
	bjorn.andersson@...ymobile.com, andrew@...n.ch, skuribay@...ox.com,
	christian.ruppert@...lis.com, Romain.Baeriswyl@...lis.com,
	mika.westerberg@...ux.intel.com, linux-kernel@...r.kernel.org,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH] i2c-designware: Intel BayTrail PMIC I2C bus support

On Fri, 12 Sep 2014 10:36:07 -0700
"David E. Box" <david.e.box@...ux.intel.com> wrote:

> +#if IS_ENABLED(CONFIG_I2C_SHARED_CONTROLLER)
> +extern int i2c_acquire_ownership(struct device *dev);
> +extern int i2c_release_ownership(struct device *dev);
> +#endif

You can just have the prototypes anyway - no need for more ifdefs than
required


> +#if IS_ENABLED(CONFIG_I2C_SHARED_CONTROLLER)
> +int i2c_shared_controller_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
> +	int num)
> +{
> +	struct dw_i2c_dev *dev = i2c_get_adapdata(adap);
> +	int err;
> +
> +	if (dev->shared_host) {
> +		err = dev->acquire_ownership(dev->dev);
> +		if (!err) {
> +			err = i2c_dw_xfer(adap, msgs, num);
> +			dev->release_ownership(dev->dev);
> +		} else
> +			dev_WARN(dev->dev, "couldnt acquire ownership\n");
> +
> +		return err;
> +	} else
> +		return i2c_dw_xfer(adap, msgs, num);
> +}
> +
> +static struct i2c_algorithm i2c_sc_algo = {
> +	.master_xfer	= i2c_shared_controller_xfer,
> +	.functionality	= i2c_dw_func,
> +};
> +#endif

I think this might be a lot cleaner if you put these pieces as functions
into i2c-designware-sem.c or a similar file and made the methods NULL
functions in the header in the case it's not supported ? Most of the
ifdeffery would then vanish into the extra file and keep the core code
cleaner ?


Alan
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