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| author | Philip Chen <philipchen@google.com> | 2018-03-13 12:38:44 -0700 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2018-03-14 04:07:09 -0700 |
| commit | ccea4b67f2e36a505ddf546bde284f75d728add0 (patch) | |
| tree | 7ef350b4cff0613e6ef31e8d7474f5e9d3cbe8cd /driver/battery/max17055.c | |
| parent | e325981c7d39f7160fafd4681384e410a137fa92 (diff) | |
| download | chrome-ec-ccea4b67f2e36a505ddf546bde284f75d728add0.tar.gz | |
battery/max17055: Fix the unit of cycle count
The cycle counts we get from battery_cycle_count()
is in the unit of 1%.
But we should convert it to absolute count to match
the behavior of a smart battery.
BUG=b:74576000
BRANCH=scarlet
TEST='ectool battery' shows reasonable cycle counts
Change-Id: I9d351f8766c90e0addb72a088917ddadfa6c840a
Signed-off-by: Philip Chen <philipchen@google.com>
Reviewed-on: https://chromium-review.googlesource.com/961303
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Philip Chen <philipchen@chromium.org>
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
Diffstat (limited to 'driver/battery/max17055.c')
| -rw-r--r-- | driver/battery/max17055.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/driver/battery/max17055.c b/driver/battery/max17055.c index 4836cf242d..9be2a14651 100644 --- a/driver/battery/max17055.c +++ b/driver/battery/max17055.c @@ -34,6 +34,8 @@ #define TEMPERATURE_CONV(REG) (((REG * 10) >> 8) + 2731) /* Percentage reg value to 1% */ #define PERCENTAGE_CONV(REG) (REG >> 8) +/* Cycle count reg value (LSB = 1%) to absolute count (100%) */ +#define CYCLE_COUNT_CONV(REG) ((REG * 5) >> 9) /* Useful macros */ #define MAX17055_READ_DEBUG(offset, ptr_reg) \ @@ -135,7 +137,13 @@ int battery_time_to_full(int *minutes) int battery_cycle_count(int *count) { - return max17055_read(REG_CYCLE_COUNT, count); + int rv; + int reg; + + rv = max17055_read(REG_CYCLE_COUNT, ®); + if (!rv) + *count = CYCLE_COUNT_CONV(reg); + return rv; } int battery_design_capacity(int *capacity) |