TCPMV2: Add support for (CT) Vconn Powered Devices

Add support for Charge Through Vconn Powered Devices

BUG=b:165934405
BRANCH=none
TEST=make runtests
     1) Verified that Apple VPD audio device worked.
     2) With charger plugged into Chocodile_Vpdmcu,
        verified that a Voxel could be charged.
     3) FAILED: Plugging Chocodile_Vpdmcu into Voxel
                first and then plugging in charger to
		Chocodile_Vpdmcu, Chocodile is detected
		as a Debug Accessory (CC1 = Rd and CC2 = Rd)
		and VCONN is never applied.

Signed-off-by: Sam Hurst <shurst@google.com>
Change-Id: I977b316dc531aa33bb6a236523c8ddbbb23014d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2748429
Reviewed-by: Diana Z <dzigterman@chromium.org>

2 files changed, 89 insertions, 0 deletions

diff --git a/include/usb_pd.h b/include/usb_pd.h
index ed15149441..f1171d6583 100644
--- a/include/usb_pd.h
+++ b/include/usb_pd.h
@@ -1808,6 +1808,76 @@ void dfp_consume_modes(int port, enum tcpm_transmit_type type, int cnt,
 		uint32_t *payload);
 
 /**
+ * Returns true if connected VPD supports Charge Through
+ *
+ * @param port  USB-C port number
+ * @return      TRUE if Charge Through is supported, else FALSE
+ */
+bool is_vpd_ct_supported(int port);
+
+/**
+ * Returns CTVPD ground impedance
+ *
+ * @param port     USB-C port number
+ * @return         Ground impedance through the VPD in 1 mOhm increments, else
+ *                 0 if Charge Through isn't supported
+ */
+uint8_t get_vpd_ct_gnd_impedance(int port);
+
+/**
+ * Returns CTVPD VBUS impedance
+ *
+ * @param port     USB-C port number
+ * @return         VBUS impedance through the VPD in 2 mOhm increments, else
+ *                 0 if Charge Through isn't supported
+ */
+uint8_t get_vpd_ct_vbus_impedance(int port);
+
+/**
+ * Returns CTVPD Current support
+ *
+ * @param port     USB-C port number
+ * @return         0 - 3A capable or
+ *                 1 - 5A capable
+ */
+uint8_t get_vpd_ct_current_support(int port);
+
+/**
+ * Returns CTVPD Maximum VBUS Voltage
+ *
+ * @param port     USB-C port number
+ * @return         0 - 20V
+ *                 1 - 30V
+ *                 2 - 40V
+ *                 3 - 50V
+ */
+uint8_t get_vpd_ct_max_vbus_voltage(int port);
+
+/**
+ * Returns VPD VDO Version
+ *
+ * @param port     USB-C port number
+ * @return         0 for Version 1.0
+ */
+uint8_t get_vpd_ct_vdo_version(int port);
+
+/**
+ * Returns VPD Firmware Version
+ *
+ * @param port     USB-C port number
+ * @return         Firmware version assigned by the VID owner
+ */
+uint8_t get_vpd_ct_firmware_verion(int port);
+
+/**
+ * Returns HW Firmware Version
+ *
+ * @param port     USB-C port number
+ * @return         HW version assigned by the VID owner
+ */
+uint8_t get_vpd_ct_hw_version(int port);
+
+/**
  * Initialize alternate mode discovery info for DFP
  *
  * @param port     USB-C port number
diff --git a/include/usb_pd_vdo.h b/include/usb_pd_vdo.h
index ac8e67b73e..b146fde179 100644
--- a/include/usb_pd_vdo.h
+++ b/include/usb_pd_vdo.h
@@ -965,6 +965,22 @@ union enter_usb_data_obj {
 	uint32_t raw_value;
 };
 
+union vpd_vdo {
+	struct {
+		uint32_t ct_support : 1;
+		uint32_t gnd_impedance : 6;
+		uint32_t vbus_impedance : 6;
+		uint32_t reserved0 : 1;
+		uint32_t ct_current_support : 1;
+		uint32_t max_vbus_voltage : 2;
+		uint32_t reserved1 : 4;
+		uint32_t vdo_version : 3;
+		uint32_t firmware_version : 4;
+		uint32_t hw_version : 4;
+	};
+	uint32_t raw_value;
+};
+
 /*
  * ############################################################################
  *
@@ -982,6 +998,9 @@ union product_type_vdo1 {
 	union active_cable_vdo_rev20 a_rev20;
 	union active_cable_vdo1_rev30 a_rev30;
 
+	/* Vconn Power USB Device VDO */
+	union vpd_vdo vpd;
+
 	uint32_t raw_value;
 };
 BUILD_ASSERT(sizeof(uint32_t) == sizeof(union product_type_vdo1));