[alsa-devel] [PATCH] ASoC: nau8810: Add driver for Nuvoton codec chip NAU88C10

[John Hsu]

Hi,

On 8/17/2016 5:42 PM, Mark Brown wrote:
> On Wed, Aug 17, 2016 at 08:34:15AM +0800, John Hsu wrote:
>   
>> On 8/16/2016 6:38 PM, Mark Brown wrote:
>>     
>
>   
>>> You're not open coding this, this is using regmap!
>>>       
>
>   
>> Yes, the regmap raw read will use regmap finally. But it needs
>> format_val to make the value and it is not registered because
>> no such value width, 9 bits. The system will crash if the driver
>> uses regmap_raw_read with 9 bits value.
>>     
>
> The whole point with raw read is that it isn't reformatting the value.
>   

I post the partial function. The format_val is not valid for our
codec driver and we can't use the regmap_raw_read(). It's the reason
that we need to make the function like regmap_raw_read().

int regmap_raw_read(struct regmap *map, unsigned int reg, ... )
{
    ...
    if (regmap_volatile_range(map, reg, val_count) ... ) {
        ...
    } else {
        /* Otherwise go word by word for the cache; should be low
         * cost as we expect to hit the cache.
         */
        for (i = 0; i < val_count; i++) {
            ret = _regmap_read(map, reg + regmap_get_offset(map, i),
                       &v);
            if (ret != 0)
                goto out;

            map->format.format_val(val + (i * val_bytes), v, 0);
        }
    }