Change in coreboot[master]: chromeec: Add function to retrieve usb c charger info

[Shelley Chen (Code Review)]

Shelley Chen has uploaded this change for review. ( https://review.coreboot.org/21771

Change subject: chromeec: Add function to retrieve usb c charger info
......................................................................

chromeec: Add function to retrieve usb c charger info

Add google_chromeec_get_usb_pd_power_info(), which will
call the EC_CMD_USB_PD_CONTROL host command to retrieve
the current and voltage info of the usb c charger.
Returns power info in watts.

BUG=b:37473486
BRANCH=None
TEST=output debug info to make sure that correct power
     is returned.

Change-Id: Ie14a0a6163e1c2699cb20b4422c8062164d92076
Signed-off-by: Shelley Chen 
---
M src/ec/google/chromeec/ec.c
M src/ec/google/chromeec/ec.h
2 files changed, 31 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/71/21771/1

diff --git a/src/ec/google/chromeec/ec.c b/src/ec/google/chromeec/ec.c
index 03d4c3b..47bd5a3 100644
--- a/src/ec/google/chromeec/ec.c
+++ b/src/ec/google/chromeec/ec.c
@@ -622,6 +622,36 @@
    return google_chromeec_command(&cmd);
 }

+/* Get charger power info in Watts */
+int google_chromeec_get_usb_pd_power_info(void)
+{
+	struct ec_params_usb_pd_power_info req = {
+		.port = PD_POWER_CHARGING_PORT,
+	};
+	struct ec_response_usb_pd_power_info rsp;
+	struct chromeec_command cmd = {
+		.cmd_code = EC_CMD_USB_PD_POWER_INFO,
+		.cmd_version = 0,
+		.cmd_data_in = &req,
+		.cmd_size_in = sizeof(req),
+		.cmd_data_out = &rsp,
+		.cmd_size_out = sizeof(rsp),
+		.cmd_dev_index = 0,
+	};
+	struct usb_chg_measures m;
+
+	google_chromeec_command(&cmd);
+
+	m = rsp.meas;
+
+	if (rsp.type == USB_CHG_TYPE_PD) {
+		/* values are given in milliAmps and milliVolts */
+		return (m.current_max * m.voltage_max)/1000000;
+	}
+	/* If barrel jack, then just return 0 */
+	return 0;
+}
+
 int google_chromeec_set_usb_pd_role(u8 port, enum usb_pd_control_role role)
 {
    struct ec_params_usb_pd_control req = {
diff --git a/src/ec/google/chromeec/ec.h b/src/ec/google/chromeec/ec.h
index 3a7cadd..47760fb 100644
--- a/src/ec/google/chromeec/ec.h
+++ b/src/ec/google/chromeec/ec.h
@@ -89,6 +89,7 @@
 };
 int google_chromeec_set_usb_charge_mode(u8 port_id, enum usb_charge_mode mode);
 int google_chromeec_set_usb_pd_role(u8 port, enum usb_pd_control_role role);
+int google_chromeec_get_usb_pd_power_info(void);

/* internal structure to send a command to the EC and wait for response. */
 struct chromeec_command {