linux-kernel - Re: [PATCH v2] power: bq25890: add POWER_SUPPLY_PROP

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Message-ID: <20211202173114.mldcwy6aydccp54n@earth.universe>
Date:   Thu, 2 Dec 2021 18:31:14 +0100
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Angus Ainslie <angus@...ea.ca>
Cc:     Hans de Goede <hdegoede@...hat.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...i.sm
Subject: Re: [PATCH v2] power: bq25890: add POWER_SUPPLY_PROP_TEMP

Hi,

On Thu, Nov 18, 2021 at 08:18:45AM -0800, Angus Ainslie wrote:
> Add the POWER_SUPPLY_PROP_TEMP and a NTC 10K percent VREGN to degrees LUT.
> 
> Make sure that a conversion is forced when the power supply is offline so
> the temperature is valid.
> 
> Signed-off-by: Angus Ainslie <angus@...ea.ca>
> ---

Thanks, queued.

-- Sebastian

>  drivers/power/supply/bq25890_charger.c | 37 +++++++++++++++++++++++++-
>  1 file changed, 36 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
> index 945c3257ca93..0260c6efdcb2 100644
> --- a/drivers/power/supply/bq25890_charger.c
> +++ b/drivers/power/supply/bq25890_charger.c
> @@ -266,6 +266,7 @@ enum bq25890_table_ids {
>  	/* lookup tables */
>  	TBL_TREG,
>  	TBL_BOOSTI,
> +	TBL_TSPCT,
>  };
>  
>  /* Thermal Regulation Threshold lookup table, in degrees Celsius */
> @@ -280,6 +281,28 @@ static const u32 bq25890_boosti_tbl[] = {
>  
>  #define BQ25890_BOOSTI_TBL_SIZE		ARRAY_SIZE(bq25890_boosti_tbl)
>  
> +/* NTC 10K temperature lookup table in tenths of a degree */
> +static const u32 bq25890_tspct_tbl[] = {
> +	850, 840, 830, 820, 810, 800, 790, 780,
> +	770, 760, 750, 740, 730, 720, 710, 700,
> +	690, 685, 680, 675, 670, 660, 650, 645,
> +	640, 630, 620, 615, 610, 600, 590, 585,
> +	580, 570, 565, 560, 550, 540, 535, 530,
> +	520, 515, 510, 500, 495, 490, 480, 475,
> +	470, 460, 455, 450, 440, 435, 430, 425,
> +	420, 410, 405, 400, 390, 385, 380, 370,
> +	365, 360, 355, 350, 340, 335, 330, 320,
> +	310, 305, 300, 290, 285, 280, 275, 270,
> +	260, 250, 245, 240, 230, 225, 220, 210,
> +	205, 200, 190, 180, 175, 170, 160, 150,
> +	145, 140, 130, 120, 115, 110, 100, 90,
> +	80, 70, 60, 50, 40, 30, 20, 10,
> +	0, -10, -20, -30, -40, -60, -70, -80,
> +	-90, -10, -120, -140, -150, -170, -190, -210,
> +};
> +
> +#define BQ25890_TSPCT_TBL_SIZE		ARRAY_SIZE(bq25890_tspct_tbl)
> +
>  struct bq25890_range {
>  	u32 min;
>  	u32 max;
> @@ -308,7 +331,8 @@ static const union {
>  
>  	/* lookup tables */
>  	[TBL_TREG] =	{ .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} },
> -	[TBL_BOOSTI] =	{ .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} }
> +	[TBL_BOOSTI] =	{ .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} },
> +	[TBL_TSPCT] =	{ .lt = {bq25890_tspct_tbl, BQ25890_TSPCT_TBL_SIZE} }
>  };
>  
>  static int bq25890_field_read(struct bq25890_device *bq,
> @@ -388,6 +412,7 @@ static bool bq25890_is_adc_property(enum power_supply_property psp)
>  	switch (psp) {
>  	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
>  	case POWER_SUPPLY_PROP_CURRENT_NOW:
> +	case POWER_SUPPLY_PROP_TEMP:
>  		return true;
>  
>  	default:
> @@ -528,6 +553,15 @@ static int bq25890_power_supply_get_property(struct power_supply *psy,
>  		val->intval = ret * -50000;
>  		break;
>  
> +	case POWER_SUPPLY_PROP_TEMP:
> +		ret = bq25890_field_read(bq, F_TSPCT);
> +		if (ret < 0)
> +			return ret;
> +
> +		/* convert TS percentage into rough temperature */
> +		val->intval = bq25890_find_val(ret, TBL_TSPCT);
> +		break;
> +
>  	default:
>  		return -EINVAL;
>  	}
> @@ -713,6 +747,7 @@ static const enum power_supply_property bq25890_power_supply_props[] = {
>  	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
>  	POWER_SUPPLY_PROP_VOLTAGE_NOW,
>  	POWER_SUPPLY_PROP_CURRENT_NOW,
> +	POWER_SUPPLY_PROP_TEMP,
>  };
>  
>  static char *bq25890_charger_supplied_to[] = {
> -- 
> 2.25.1
> 

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