linux-kernel - Re: [PATCH 2/4] regmap: Add I2C bus support

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Date:	Sat, 9 Jul 2011 13:53:07 +0200
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Greg KH <greg@...ah.com>,
	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...com>,
	Samuel Oritz <sameo@...ux.intel.com>,
	Graeme Gregory <gg@...mlogic.co.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] regmap: Add I2C bus support

Hi Mark,

On Sat, Jul 09, 2011 at 01:50:42PM +0900, Mark Brown wrote:

> +#include <linux/regmap.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>

I second Lars-Peter with init.h here (from his first review).

> +static int regmap_i2c_read(struct device *dev,
> +			   const void *reg, size_t reg_size,
> +			   void *val, size_t val_size)
> +{
> +	struct i2c_client *i2c = to_i2c_client(dev);
> +	struct i2c_msg xfer[2];
> +	int ret;
> +
> +	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_PROTOCOL_MANGLING))
> +		return -ENOTSUPP;

Even more here. MANGLING is not needed for reading (and it will fail for a
number of i2c-masters).

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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