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power: supply: axp288_fuel_gauge: Only read PWR_OP_MODE, FG_LOW_CAP_REG regs once

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Accessing registers on the AXP288 is quite expensive, so we should avoid
doing unnecessary accesses.

The FG_LOW_CAP_REG never changes underneath us, so we only need to read
it once. Devices with an AXP288 do not have user-replace (let alone
hot-swappable) batteries and the only bit we care about in the
PWR_OP_MODE register is the CHRG_STAT_BAT_PRESENT bit, so we can get
away with only reading the PWR_OP_MODE register once too.

Note that the FG_LOW_CAP_REG is not marked volatile in the regmap, so we
were effectively already reading it once. This change makes this explicit,
this is done as preparation of a further patch which moves all remaining
register accesses in fuel_gauge_get_property() out of that function.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Hans de Goede 2021-08-01 15:31:02 +02:00 committed by Sebastian Reichel
parent 7eef3e6638
commit c371d4491b
1 changed files with 21 additions and 16 deletions
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37
drivers/power/supply/axp288_fuel_gauge.c
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@ -111,6 +111,8 @@ struct axp288_fg_info {
struct mutex lock;
int status;
int max_volt;
int pwr_op;
int low_cap;
struct dentry *debug_file;
};
@ -336,11 +338,7 @@ static int fuel_gauge_get_property(struct power_supply *ps,
val->intval = PROP_CURR(value);
break;
case POWER_SUPPLY_PROP_PRESENT:
ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
if (ret < 0)
goto fuel_gauge_read_err;
if (ret & CHRG_STAT_BAT_PRESENT)
if (info->pwr_op & CHRG_STAT_BAT_PRESENT)
val->intval = 1;
else
val->intval = 0;
@ -355,10 +353,7 @@ static int fuel_gauge_get_property(struct power_supply *ps,
val->intval = (ret & FG_REP_CAP_VAL_MASK);
break;
case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
if (ret < 0)
goto fuel_gauge_read_err;
val->intval = (ret & 0x0f);
val->intval = (info->low_cap & 0x0f);
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
@ -398,7 +393,7 @@ static int fuel_gauge_set_property(struct power_supply *ps,
const union power_supply_propval *val)
{
struct axp288_fg_info *info = power_supply_get_drvdata(ps);
int ret = 0;
int new_low_cap, ret = 0;
mutex_lock(&info->lock);
switch (prop) {
@ -407,12 +402,12 @@ static int fuel_gauge_set_property(struct power_supply *ps,
ret = -EINVAL;
break;
}
ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
if (ret < 0)
break;
ret &= 0xf0;
ret |= (val->intval & 0xf);
ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
new_low_cap = info->low_cap;
new_low_cap &= 0xf0;
new_low_cap |= (val->intval & 0xf);
ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, new_low_cap);
if (ret == 0)
info->low_cap = new_low_cap;
break;
default:
ret = -EINVAL;
@ -695,6 +690,16 @@ static int axp288_fuel_gauge_probe(struct platform_device *pdev)
break;
}
ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
if (ret < 0)
goto out_free_iio_chan;
info->pwr_op = ret;
ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
if (ret < 0)
goto out_free_iio_chan;
info->low_cap = ret;
psy_cfg.drv_data = info;
info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
if (IS_ERR(info->bat)) {