linux-kernel - Re:Re: [PATCH] power: supply: 88pm860x_battery array

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Date:   Fri, 27 Oct 2017 10:48:00 +0800 (CST)
From:   刘稳 <18502523564@....com>
To:     "Joe Perches" <joe@...ches.com>
Cc:     sre@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re:Re: [PATCH] power: supply: 88pm860x_battery array_soc first
 number is in mV











At 2017-10-26 12:41:18, "Joe Perches" <joe@...ches.com> wrote:
>On Thu, 2017-10-26 at 13:21 +0800, winton.liu wrote:
>> Fix wrong comments of array_soc description.
>> First number is mV not mAh.
>[]
>> diff --git a/drivers/power/supply/88pm860x_battery.c b/drivers/power/supply/88pm860x_battery.c
>[]
>> @@ -123,7 +123,7 @@ struct ccnt {
>>  
>>  /*
>>   * State of Charge.
>> - * The first number is mAh(=3.6C), and the second number is percent point.
>> + * The first number is mV, and the second number is percent point.
>>   */
>>  static int array_soc[][2] = {
>>  	{4170, 100}, {4154, 99}, {4136, 98}, {4122, 97}, {4107, 96},
>
>OK, but why not change the declaration to a struct
>and make it obvious?
>
>Also, the array or struct should be const.
>
    Yes, using a struct makes it more readable.

>Perhaps:
>---
> drivers/power/supply/88pm860x_battery.c | 13 ++++++++-----
> 1 file changed, 8 insertions(+), 5 deletions(-)
>
>diff --git a/drivers/power/supply/88pm860x_battery.c b/drivers/power/supply/88pm860x_battery.c
>index 63c57dc82ac1..973c5f7b07ba 100644
>--- a/drivers/power/supply/88pm860x_battery.c
>+++ b/drivers/power/supply/88pm860x_battery.c
>@@ -123,9 +123,12 @@ struct ccnt {
> 
> /*
>  * State of Charge.
>- * The first number is mAh(=3.6C), and the second number is percent point.
>+ * The first number is mV(=3.6C), and the second number is percent point3..
       '(=3.6C)' is not needed. 1mAh = 1mA *3600s = 3.6C. As first number is mV, 3.6C is not needed.
>  */
>-static int array_soc[][2] = {
>+static const struct {
>+	u16 mv;
>+	u8 percent;
>+} array_soc[] = {
> 	{4170, 100}, {4154, 99}, {4136, 98}, {4122, 97}, {4107, 96},
> 	{4102, 95}, {4088, 94}, {4081, 93}, {4070, 92}, {4060, 91},
> 	{4053, 90}, {4044, 89}, {4035, 88}, {4028, 87}, {4019, 86},
>@@ -388,14 +391,14 @@ static int calc_soc(struct pm860x_battery_info *info, int state, int *soc)
> 		return ret;
> 
> 	count = ARRAY_SIZE(array_soc);
>-	if (ocv < array_soc[count - 1][0]) {
>+	if (ocv < array_soc[count - 1].mv) {
> 		*soc = 0;
> 		return 0;
> 	}
> 
> 	for (i = 0; i < count; i++) {
>-		if (ocv >= array_soc[i][0]) {
>-			*soc = array_soc[i][1];
>+		if (ocv >= array_soc[i].mv) {
>+			*soc = array_soc[i].percent;
> 			break;
> 		}
> 	}
>