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| author | Jonathan Brandmeyer <jbrandmeyer@chromium.org> | 2018-08-03 13:24:06 -0600 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2018-08-08 04:29:20 -0700 |
| commit | b80693e94e6e9aa0a382c39c20efba6f2c7403a9 (patch) | |
| tree | b44a8b48858906c6f8a3875b6a69d7c2b6908ddc /include/battery_fuel_gauge.h | |
| parent | 5d2cdcab232748095d1efeb4e5c0fc23b13adb67 (diff) | |
| download | chrome-ec-b80693e94e6e9aa0a382c39c20efba6f2c7403a9.tar.gz | |
battery: Optionally prevent boot at low SOC with cell imbalance.
Measure the cell imbalance with method dispatch to a per-battery
method, such that families with a plurality of configurable batteries
can support them all. By default, cell imbalance is taken to be 'zero'
in case we don't support that battery's management IC. Provide a driver
for reading cell voltages for the TI BQ4050 family. This IC is quite
popular, but by no means universal.
BUG=b:111214767
BRANCH=none
TEST=Boot on Careena with a custom debug print statement, showing that
we can measure the typical battery voltages during and after the boot at
the battery status polling interval.
Change-Id: I235389b252ac9c373aa9706dbd1066f7c0bbce71
Signed-off-by: Jonathan Brandmeyer <jbrandmeyer@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1162663
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
Diffstat (limited to 'include/battery_fuel_gauge.h')
| -rw-r--r-- | include/battery_fuel_gauge.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/battery_fuel_gauge.h b/include/battery_fuel_gauge.h index 8de72d7d4e..9c3b0b12da 100644 --- a/include/battery_fuel_gauge.h +++ b/include/battery_fuel_gauge.h @@ -31,6 +31,11 @@ struct fuel_gauge_info { const uint8_t override_nil; const struct ship_mode_info ship_mode; const struct fet_info fet; + +#ifdef CONFIG_BATTERY_MEASURE_IMBALANCE + /* See battery_*_imbalance_mv() for functions which are suitable. */ + int (*imbalance_mv)(void); +#endif }; struct board_batt_params { @@ -42,4 +47,18 @@ struct board_batt_params { extern const struct board_batt_params board_battery_info[]; extern const enum battery_type DEFAULT_BATTERY_TYPE; + +#ifdef CONFIG_BATTERY_MEASURE_IMBALANCE +/** + * Report the absolute difference between the highest and lowest cell voltage in + * the battery pack, in millivolts. On error or unimplemented, returns '0'. + */ +int battery_default_imbalance_mv(void); + +#ifdef CONFIG_BATTERY_BQ4050 +int battery_bq4050_imbalance_mv(void); +#endif + +#endif + #endif /* __CROS_EC_BATTERY_FUEL_GAUGE_H */ |