diff options
Diffstat (limited to 'board/zoombini/battery.c')
| -rw-r--r-- | board/zoombini/battery.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/board/zoombini/battery.c b/board/zoombini/battery.c index a5077881c1..f29f9b6009 100644 --- a/board/zoombini/battery.c +++ b/board/zoombini/battery.c @@ -9,6 +9,7 @@ #include "battery_smart.h" #include "common.h" #include "ec_commands.h" +#include "extpower.h" /* Shutdown mode parameter to write to manufacturer access register */ #define SB_SHUTDOWN_DATA 0x0010 @@ -71,3 +72,47 @@ const struct battery_info *battery_get_info(void) { return &info; } + +enum battery_disconnect_state battery_get_disconnect_state(void) +{ + uint8_t data[6]; + int rv; + + /* + * Take note if we find that the battery isn't in disconnect state, + * and always return NOT_DISCONNECTED without probing the battery. + * This assumes the battery will not go to disconnect state during + * runtime. + */ + static int not_disconnected; + + if (not_disconnected) + return BATTERY_NOT_DISCONNECTED; + + if (extpower_is_present()) { + /* Check if battery charging + discharging is disabled. */ + rv = sb_read_mfgacc(PARAM_OPERATION_STATUS, + SB_ALT_MANUFACTURER_ACCESS, data, sizeof(data)); + if (rv) + return BATTERY_DISCONNECT_ERROR; + if (~data[3] & (BATTERY_DISCHARGING_DISABLED | + BATTERY_CHARGING_DISABLED)) { + not_disconnected = 1; + return BATTERY_NOT_DISCONNECTED; + } + + /* + * Battery is neither charging nor discharging. Verify that + * we didn't enter this state due to a safety fault. + */ + rv = sb_read_mfgacc(PARAM_SAFETY_STATUS, + SB_ALT_MANUFACTURER_ACCESS, data, sizeof(data)); + if (rv || data[2] || data[3] || data[4] || data[5]) + return BATTERY_DISCONNECT_ERROR; + + /* No safety fault, battery is disconnected */ + return BATTERY_DISCONNECTED; + } + not_disconnected = 1; + return BATTERY_NOT_DISCONNECTED; +} |