diff options
| author | Linus Walleij <linus.walleij@linaro.org> | 2022-02-26 00:27:57 +0100 |
|---|---|---|
| committer | Sebastian Reichel <sebastian.reichel@collabora.com> | 2022-02-28 11:34:31 +0100 |
| commit | 1f918e0fe43ec41d906e2cf96b80b15451fed7ba (patch) | |
| tree | 0e2de0ee5e69c0d5c5987046c6d22d17d67e089c /drivers/power/supply/ab8500_fg.c | |
| parent | 0e8b903b522b5a3cb473035cea085d396dd7150a (diff) | |
| download | linux-1f918e0fe43ec41d906e2cf96b80b15451fed7ba.tar.bz2 | |
power: supply: ab8500: Standardize BTI resistance
The Battery Type Indicator (BTI) resistor is a resistor mounted
between a special terminal on the battery and ground. By sending
a fixed current (such as 7mA) through this resistor and measuring
the voltage over it, the resistance can be determined, and this
verifies the battery type.
Typical side view of the battery:
o o o
GND BTI +3.8V
Typical example of the electrical layout:
+3.8 V BTI
| |
| + |
_______ [ ] 7kOhm
___ |
| |
| |
GND GND
By verifying this resistance before attempting to charge the
battery we add an additional level of security.
In some systems this is used for plug-and-play of batteries with
different capacity. In other cases, this is merely used to verify
that the right type of battery is connected, if several batteries
have the same physical shape and can be plugged into the same
slot. Sometimes this is just a surplus security mechanism.
Nokia and Samsung among many other vendors are known to use these
BTI resistors.
Add the BTI properties to struct power_supply_battery_info and
switch the AB8500 charger code over to using it.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Diffstat (limited to 'drivers/power/supply/ab8500_fg.c')
| -rw-r--r-- | drivers/power/supply/ab8500_fg.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/drivers/power/supply/ab8500_fg.c b/drivers/power/supply/ab8500_fg.c index 0227e800c58d..f2ff3103e0d0 100644 --- a/drivers/power/supply/ab8500_fg.c +++ b/drivers/power/supply/ab8500_fg.c @@ -2241,10 +2241,6 @@ static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data) if (!di->flags.batt_id_received && (bi && (bi->technology != POWER_SUPPLY_TECHNOLOGY_UNKNOWN))) { - const struct ab8500_battery_type *b; - - b = di->bm->bat_type; - di->flags.batt_id_received = true; di->bat_cap.max_mah_design = |