cros_ec: Allow reading the battery-charge state
Add a function to read this information from the EC. It is useful for
determining whether the battery has enough charge to boot.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/misc/cros_ec.c b/drivers/misc/cros_ec.c
index 7904d5c..0818ef8 100644
--- a/drivers/misc/cros_ec.c
+++ b/drivers/misc/cros_ec.c
@@ -1661,6 +1661,23 @@
return ret;
}
+int cros_ec_read_batt_charge(struct udevice *dev, uint *chargep)
+{
+ struct ec_params_charge_state req;
+ struct ec_response_charge_state resp;
+ int ret;
+
+ req.cmd = CHARGE_STATE_CMD_GET_STATE;
+ ret = ec_command(dev, EC_CMD_CHARGE_STATE, 0, &req, sizeof(req),
+ &resp, sizeof(resp));
+ if (ret)
+ return log_msg_ret("read", ret);
+
+ *chargep = resp.get_state.batt_state_of_charge;
+
+ return 0;
+}
+
UCLASS_DRIVER(cros_ec) = {
.id = UCLASS_CROS_EC,
.name = "cros-ec",
diff --git a/include/cros_ec.h b/include/cros_ec.h
index 9396b4d..9dab6cd 100644
--- a/include/cros_ec.h
+++ b/include/cros_ec.h
@@ -652,4 +652,12 @@
int cros_ec_vstore_write(struct udevice *dev, int slot, const uint8_t *data,
size_t size);
+/**
+ * cros_ec_read_batt_charge() - Read the battery-charge state
+ *
+ * @dev: CROS-EC device
+ * @chargep: Return battery-charge state as a percentage
+ */
+int cros_ec_read_batt_charge(struct udevice *dev, uint *chargep);
+
#endif