diff options
| 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.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.h')
| -rw-r--r-- | include/battery.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/battery.h b/include/battery.h index a97745b794..2ba56e1c9d 100644 --- a/include/battery.h +++ b/include/battery.h @@ -117,6 +117,7 @@ int battery_get_avg_voltage(void); /* in mV */ #define BATT_FLAG_BAD_REMAINING_CAPACITY 0x00000100 #define BATT_FLAG_BAD_FULL_CAPACITY 0x00000200 #define BATT_FLAG_BAD_STATUS 0x00000400 +#define BATT_FLAG_IMBALANCED_CELL 0x00000800 /* All of the above BATT_FLAG_BAD_* bits */ #define BATT_FLAG_BAD_ANY 0x000007fc @@ -328,6 +329,12 @@ int battery_device_chemistry(char *dest, int size); int battery_manufacturer_date(int *year, int *month, int *day); /** + * 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_imbalance_mv(void); + +/** * Call board-specific cut-off function. * * @return EC_RES_INVALID_COMMAND if the battery doesn't support. |