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bq27xxx: add voltage min design for bq27000 and bq27200

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The bq27x00 gauges have an EEPROM register which contains the value of
the voltage that should be considered to be zero battery capacity. Expose
this to userspace using the VOLTAGE_MIN_DESIGN property.

Tested on Nokia N900 with bq27200.

Signed-off-by: Sicelo A. Mhlongo <absicsz@gmail.com>
Acked-by: Pali Rohár <pali@kernel.org>
Link: https://lore.kernel.org/r/20241125151321.45440-1-absicsz@gmail.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Sicelo A. Mhlongo 2024-11-25 17:12:58 +02:00 committed by Sebastian Reichel
parent 156fb706f9
commit 525f6a2c63
2 changed files with 39 additions and 1 deletions
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39
drivers/power/supply/bq27xxx_battery.c
View File

@ -123,6 +123,7 @@ enum bq27xxx_reg_index {
BQ27XXX_DM_BLOCK, /* Data Block */
BQ27XXX_DM_DATA, /* Block Data */
BQ27XXX_DM_CKSUM, /* Block Data Checksum */
BQ27XXX_REG_SEDVF, /* End-of-discharge Voltage */
BQ27XXX_REG_MAX, /* sentinel */
};
@ -159,6 +160,7 @@ static u8
[BQ27XXX_DM_BLOCK] = INVALID_REG_ADDR,
[BQ27XXX_DM_DATA] = INVALID_REG_ADDR,
[BQ27XXX_DM_CKSUM] = INVALID_REG_ADDR,
[BQ27XXX_REG_SEDVF] = 0x77,
},
bq27010_regs[BQ27XXX_REG_MAX] = {
[BQ27XXX_REG_CTRL] = 0x00,
@ -184,6 +186,7 @@ static u8
[BQ27XXX_DM_BLOCK] = INVALID_REG_ADDR,
[BQ27XXX_DM_DATA] = INVALID_REG_ADDR,
[BQ27XXX_DM_CKSUM] = INVALID_REG_ADDR,
[BQ27XXX_REG_SEDVF] = 0x77,
},
bq2750x_regs[BQ27XXX_REG_MAX] = {
[BQ27XXX_REG_CTRL] = 0x00,
@ -579,6 +582,7 @@ static enum power_supply_property bq27000_props[] = {
POWER_SUPPLY_PROP_POWER_AVG,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_MANUFACTURER,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
};
static enum power_supply_property bq27010_props[] = {
@ -599,6 +603,7 @@ static enum power_supply_property bq27010_props[] = {
POWER_SUPPLY_PROP_CYCLE_COUNT,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_MANUFACTURER,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
};
#define bq2750x_props bq27510g3_props
@ -2039,6 +2044,36 @@ static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
return 0;
}
/*
* Return the design minimum battery Voltage in microvolts
* Or < 0 if something fails.
*/
static int bq27xxx_battery_read_dmin_volt(struct bq27xxx_device_info *di,
union power_supply_propval *val)
{
int volt;
/* We only have to read design minimum voltage once */
if (di->voltage_min_design > 0) {
val->intval = di->voltage_min_design;
return 0;
}
volt = bq27xxx_read(di, BQ27XXX_REG_SEDVF, true);
if (volt < 0) {
dev_err(di->dev, "error reading design min voltage\n");
return volt;
}
/* SEDVF = Design EDVF / 8 - 256 */
val->intval = volt * 8000 + 2048000;
/* Save for later reads */
di->voltage_min_design = val->intval;
return 0;
}
static int bq27xxx_simple_value(int value,
union power_supply_propval *val)
{
@ -2119,8 +2154,10 @@ static int bq27xxx_battery_get_property(struct power_supply *psy,
* power_supply_battery_info visible in sysfs.
*/
case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
return -EINVAL;
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
ret = bq27xxx_battery_read_dmin_volt(di, val);
break;
case POWER_SUPPLY_PROP_CYCLE_COUNT:
ret = bq27xxx_battery_read_cyct(di, val);
break;

1
include/linux/power/bq27xxx_battery.h
View File

@ -61,6 +61,7 @@ struct bq27xxx_device_info {
struct bq27xxx_access_methods bus;
struct bq27xxx_reg_cache cache;
int charge_design_full;
int voltage_min_design;
bool removed;
unsigned long last_update;
union power_supply_propval last_status;