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power: bq25890: add POWER_SUPPLY_PROP_TEMP

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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@akkea.ca>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Angus Ainslie 2021-11-18 08:18:45 -08:00 committed by Sebastian Reichel
parent 0838a3bfcd
commit 9652c02428
1 changed files with 36 additions and 1 deletions
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37
drivers/power/supply/bq25890_charger.c
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@ -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[] = {