On 16/03/21 4:43 pm, Guenter Roeck wrote:
> On 3/15/21 7:35 PM, Chris Packham wrote:
>> The BPA-RS600 is a compact 600W AC to DC removable power supply module.
>>
>> Signed-off-by: Chris Packham <[email protected]>
>> ---
<snip>
>> +
>> +static int bpa_rs600_read_word_data(struct i2c_client *client, int page,
>> + int phase, int reg)+{
>> + int ret;
>> +
>> + if (page > 0)
>> + return -ENXIO;
>> +
>> + switch (reg) {
>> + case PMBUS_VIN_UV_FAULT_LIMIT:
>> + case PMBUS_VIN_OV_FAULT_LIMIT:
>> + case PMBUS_VOUT_UV_FAULT_LIMIT:
>> + case PMBUS_VOUT_OV_FAULT_LIMIT:
>> + ret = -ENXIO;
> Is that needed ? Why not -ENODATA ?
Basically these commands get responses on the bus but they don't have
valid data (nor are they documented in the datasheet). I'll add a
comment to that effect.
If I'm reading things correctly -ENODATA is a signal to
_pmbus_read_word_data use the "normal" read operation. So I need to
return something other than that. I found another driver (mp2975.c)
doing the same thing for what I assume are similar reasons so I went
with -ENXIO.
>
>> + break;
<snip>
> +
>> +static const struct i2c_device_id bpa_rs600_id[] = {
>> + { "bpa_rs600", 0 },
> Hmm, no, this has an underscore. Guess you'll have to use the trick from
> iio_hwmon.c or similar to generate a valid name.
>
> Oh, wait, this is a pmbus driver, and the pmbus core uses client->name.
> Maybe we need to add an optional strreplace() to the pmbus core.
Looking into this now.
