[PATCH] regmap: i2c: fallback to SMBus if the adapter does not support standard I2C

[Mark Brown]

On Wed, Apr 16, 2014 at 10:16:10AM +0200, Boris BREZILLON wrote:

> +	if (i2c_check_functionality(i2c->adapter, I2C_FUNC_I2C)) {
> +		return &regmap_i2c;
> +	} else if (config->val_bits == 16 &&
> +		   i2c_check_functionality(i2c->adapter,
> +					   I2C_FUNC_SMBUS_WORD_DATA)) {
> +                config->reg_read = regmap_smbus_word_reg_read;
> +                config->reg_write = regmap_smbus_word_reg_write;
> +		return NULL;

This all looks good to me except we shouldn't be modifying the config
struct (it's supposed to be const).  We should instead add the ability
for the bus to set these ops - that'll also be useful for things like
AC'97.
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