Re: [PATCH v7 3/3] power: supply: bq25150 introduce the bq25150

Ricardo Rivera-Matos
2020-05-19T17:16:01Z

On 5/19/20 9:46 AM, Andrew F. Davis wrote:
> On 5/19/20 10:19 AM, Dan Murphy wrote:
>> +static int bq2515x_set_ilim_lvl(struct bq2515x_device *bq2515x, int val)
>> +{
>> + int i;
>> +
>> + if (val > BQ2515X_ILIM_MAX || val < BQ2515X_ILIM_MIN)
>> + return -EINVAL;
> Clamp to these limits, not reject. Or better, modify the below loop so
> it clamps to the highest or lowest value in bq2515x_ilim_lvl_values[],
> then drop these #defines.
>
>> +
>> + for (i = 0; i < ARRAY_SIZE(bq2515x_ilim_lvl_values); i++) {
>> + if (val == bq2515x_ilim_lvl_values[i])
>> + break;
>> +
>> + if (val > bq2515x_ilim_lvl_values[i - 1] &&
> Index out of bounds for the i = 0 case.
>
>> + val < bq2515x_ilim_lvl_values[i]) {
>> + if (val - bq2515x_ilim_lvl_values[i - 1] <
>> + bq2515x_ilim_lvl_values[i] - val) {
> You are still missing the case where the value is closer to the [i]
> element, you check that it is between [i-1] and [i], but only chose
> [i-1] when it is closer to that than [i] but equal and greater case is
> missing.
>
> Given this sets input current limits, would instead always rounding down
> be the safer option?
>
> Andrew
ACK. I am going to rewrite that altogether.
>
>> + i = i - 1;
>> + break;
>> + }
>> + }
>> + }
>> +
>> + return regmap_write(bq2515x->regmap, BQ2515X_ILIMCTRL, i);
>> +}