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 7904d5cc72de6dab872ffba78a2b5b589ed0ae84..0818ef8ad6eb6134e133be8c25d817f5ccdc41e2 100644 (file)
--- a/drivers/misc/cros_ec.c
+++ b/drivers/misc/cros_ec.c
@@ -1661,6 +1661,23 @@ int cros_ec_get_switches(struct udevice *dev)
        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 9396b4d246619cfb0cd56df6081ce9c05606d227..9dab6cdf9ba936ef2ed47fa8e38eabd91595fdfd 100644 (file)
--- a/include/cros_ec.h
+++ b/include/cros_ec.h
@@ -652,4 +652,12 @@ int cros_ec_vstore_read(struct udevice *dev, int slot, uint8_t *data);
 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