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power: bq27xxx_battery: Cleanup health checking

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Reorganize the logic checking battery health and add under temperature
condition checking.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Acked-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Andrew F. Davis 2015-09-22 14:35:10 -05:00 committed by Sebastian Reichel
parent d74534c277
commit 74aab849f3
1 changed files with 42 additions and 22 deletions
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64
drivers/power/bq27xxx_battery.c
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@ -63,6 +63,8 @@
#define BQ27XXX_FLAG_FC BIT(9) #define BQ27XXX_FLAG_FC BIT(9)
#define BQ27XXX_FLAG_OTD BIT(14) #define BQ27XXX_FLAG_OTD BIT(14)
#define BQ27XXX_FLAG_OTC BIT(15) #define BQ27XXX_FLAG_OTC BIT(15)
#define BQ27XXX_FLAG_UT BIT(14)
#define BQ27XXX_FLAG_OT BIT(15)
/* BQ27000 has different layout for Flags register */ /* BQ27000 has different layout for Flags register */
#define BQ27000_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */ #define BQ27000_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */
@ -650,12 +652,36 @@ static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
/* /*
* Returns true if a battery over temperature condition is detected * Returns true if a battery over temperature condition is detected
*/ */
static int bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags) static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
{ {
if (di->chip == BQ27500 || di->chip == BQ27541) if (di->chip == BQ27500 || di->chip == BQ27541 || di->chip == BQ27545)
return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD); return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
if (di->chip == BQ27530 || di->chip == BQ27421)
return flags & BQ27XXX_FLAG_OT;
return false;
}
/*
* Returns true if a battery under temperature condition is detected
*/
static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
{
if (di->chip == BQ27530 || di->chip == BQ27421)
return flags & BQ27XXX_FLAG_UT;
return false;
}
/*
* Returns true if a low state of charge condition is detected
*/
static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
{
if (di->chip == BQ27000 || di->chip == BQ27010)
return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
else else
return flags & BQ27XXX_FLAG_OTC; return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
} }
/* /*
@ -664,29 +690,23 @@ static int bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
*/ */
static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di) static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
{ {
u16 tval; u16 flags;
tval = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false); flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
if (tval < 0) { if (flags < 0) {
dev_err(di->dev, "error reading flag register:%d\n", tval); dev_err(di->dev, "error reading flag register:%d\n", flags);
return tval; return flags;
} }
if (di->chip == BQ27000 || di->chip == BQ27010) { /* Unlikely but important to return first */
if (tval & BQ27000_FLAG_EDV1) if (unlikely(bq27xxx_battery_overtemp(di, flags)))
tval = POWER_SUPPLY_HEALTH_DEAD; return POWER_SUPPLY_HEALTH_OVERHEAT;
else if (unlikely(bq27xxx_battery_undertemp(di, flags)))
tval = POWER_SUPPLY_HEALTH_GOOD; return POWER_SUPPLY_HEALTH_COLD;
} else { if (unlikely(bq27xxx_battery_dead(di, flags)))
if (tval & BQ27XXX_FLAG_SOCF) return POWER_SUPPLY_HEALTH_DEAD;
tval = POWER_SUPPLY_HEALTH_DEAD;
else if (bq27xxx_battery_overtemp(di, tval))
tval = POWER_SUPPLY_HEALTH_OVERHEAT;
else
tval = POWER_SUPPLY_HEALTH_GOOD;
}
return tval; return POWER_SUPPLY_HEALTH_GOOD;
} }
static void bq27xxx_battery_update(struct bq27xxx_device_info *di) static void bq27xxx_battery_update(struct bq27xxx_device_info *di)