charger: Add new APIs for measured charge values

Some of the charger ICs can provide measurements for the charge
voltage and the charge current.  This information is needed by the
OCPC module.  Previously, the charge_get_current() and
charge_get_voltage() functions were modified to provide this
information.  However, those functions are intended to provide the set
voltage and current targets for the charger IC.

This commit adds a new set of APIs, charge_get_actual_current() and
charge_get_actual_voltage() which provides the actual charge current
and voltage if the charger IC is able to provide that information.

BUG=b:182018616
BRANCH=dedede
TEST=Build and flash madoo, verify that `charger` EC console command
shows the set current and voltage targets instead of the measured
values.  Check that the `chgstate` command shows the measured values
for use with the OCPC module.
TEST=Verify that charging from the sub board works.
TEST=Verify that resistances are still calculated and seem reasonable.

Signed-off-by: Aseda Aboagye <aaboagye@google.com>
Change-Id: I82565d18908d9ea0f54934787897937488e280e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2750866
Reviewed-by: Diana Z <dzigterman@chromium.org>
Commit-Queue: Aseda Aboagye <aaboagye@chromium.org>
Tested-by: Aseda Aboagye <aaboagye@chromium.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/charger.h b/include/charger.h
index d8d62c1e9b..402f9eca73 100644
--- a/include/charger.h
+++ b/include/charger.h
@@ -85,6 +85,12 @@ struct charger_drv {
 	enum ec_error_list (*get_voltage)(int chgnum, int *voltage);
 	enum ec_error_list (*set_voltage)(int chgnum, int voltage);
 
+
+	/* Get the measured charge current and voltage in mA/mV */
+	enum ec_error_list (*get_actual_current)(int chgnum, int *current);
+	enum ec_error_list (*get_actual_voltage)(int chgnum, int *voltage);
+
+
 	/* Discharge battery when on AC power. */
 	enum ec_error_list (*discharge_on_ac)(int chgnum, int enable);
 
@@ -250,6 +256,10 @@ enum ec_error_list charger_set_current(int chgnum, int current);
 enum ec_error_list charger_get_voltage(int chgnum, int *voltage);
 enum ec_error_list charger_set_voltage(int chgnum, int voltage);
 
+/* Get the measured charge current and voltage in mA/mV */
+enum ec_error_list charger_get_actual_current(int chgnum, int *current);
+enum ec_error_list charger_get_actual_voltage(int chgnum, int *voltage);
+
 /* Discharge battery when on AC power. */
 enum ec_error_list charger_discharge_on_ac(int enable);