linux-kernel - Re: [PATCH v3] regmap: i2c: fallback to SMBus if the adapter does not support standard I2C

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Date:	Fri, 18 Apr 2014 18:57:00 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Mark Brown <broonie@...nel.org>
CC:	Lars-Peter Clausen <lars@...afoo.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Shuge <shuge@...winnertech.com>, kevin@...winnertech.com,
	Chen-Yu Tsai <wens@...e.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Carlo Caione <carlo@...one.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dev@...ux-sunxi.org
Subject: Re: [PATCH v3] regmap: i2c: fallback to SMBus if the adapter does
 not support standard I2C

On 04/18/2014 01:11 PM, Boris BREZILLON wrote:
> Some I2C adapters are only compatible with the SMBus protocol and do not
> support standard I2C transfers.
>
> Fallback to SMBus transfers if we encounter such kind of adapters.
> The transfer type is chosen according to the val_bits field in the regmap
> config.
>
> Signed-off-by: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> ---

[ ... ]

>   /**
>    * regmap_init_i2c(): Initialise register map
>    *
> @@ -109,7 +199,12 @@ static struct regmap_bus regmap_i2c = {
>   struct regmap *regmap_init_i2c(struct i2c_client *i2c,
>   			       const struct regmap_config *config)
>   {
> -	return regmap_init(&i2c->dev, &regmap_i2c, &i2c->dev, config);
> +	const struct regmap_bus *bus = regmap_get_i2c_bus(i2c, config);
> +
> +	if (IS_ERR(bus))
> +		return ERR_PTR(PTR_ERR(bus));
> +
This seems clumsy. You should be able to use ERR_CAST() instead.
Also see Documentation/coccinelle.txt and scripts/coccinelle/api/err_cast.cocci.

> +	return regmap_init(&i2c->dev, bus, &i2c->dev, config);
>   }
>   EXPORT_SYMBOL_GPL(regmap_init_i2c);
>
> @@ -126,7 +221,12 @@ EXPORT_SYMBOL_GPL(regmap_init_i2c);
>   struct regmap *devm_regmap_init_i2c(struct i2c_client *i2c,
>   				    const struct regmap_config *config)
>   {
> -	return devm_regmap_init(&i2c->dev, &regmap_i2c, &i2c->dev, config);
> +	const struct regmap_bus *bus = regmap_get_i2c_bus(i2c, config);
> +
> +	if (IS_ERR(bus))
> +		return ERR_PTR(PTR_ERR(bus));
> +
Same here.

Guenter

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