usb: enable/disable displayport alt mode through enableUsbData

Adds functionality for enabling and disabling DisplayPort Alt Mode
on the port through enableUsbData in the USB HAL to comply with USB
restrictions for heightened security mode.

Test: manual test on device - use enableUsbData dumpsys command to
      turn off DisplayPort and then turn it back on while connected to a
      partner sink.
Bug: 297208252
Change-Id: I9f071bce802b728f2229abc08efb2204e4c2505a
Signed-off-by: RD Babiera <rdbabiera@google.com>

conf/ueventd.zuma.rc

@@ -239,3 +239,6 @@
 /sys/bus/aoc/devices/control    udfps_set_clock_source  0220    system  system
 /sys/bus/aoc/devices/control    udfps_get_osc_freq      0440    system  system
 /sys/bus/aoc/devices/control    udfps_get_disp_freq     0440    system  system
+
+# USB Alt Modes
+/sys/devices/platform/10cb0000.hsi2c/i2c-*/*-0025/typec/port0/port0-partner/port0-partner.*    mode1/active    0664    system    system

usb/usb/Usb.cpp

@@ -105,6 +105,7 @@ ScopedAStatus Usb::enableUsbData(const string& in_portName, bool in_enable,
         int64_t in_transactionId) {
     bool result = true;
     std::vector<PortStatus> currentPortStatus;
+    string displayPortPartnerPath;
 
     ALOGI("Userspace turn %s USB data signaling. opID:%ld", in_enable ? "on" : "off",
             in_transactionId);
@@ -120,6 +121,27 @@ ScopedAStatus Usb::enableUsbData(const string& in_portName, bool in_enable,
                 ALOGE("Gadget cannot be pulled up");
                 result = false;
             }
+
+            if (!WriteStringToFile("1", DISPLAYPORT_ACTIVE_PATH)) {
+                ALOGE("Failed to enable DisplayPort Alt Mode on port");
+            } else {
+                ALOGI("Successfully enabled DisplayPort Alt Mode on port");
+            }
+
+            if (getDisplayPortUsbPathHelper(&displayPortPartnerPath) == Status::SUCCESS) {
+                size_t pos = displayPortPartnerPath.find("/displayport");
+                if (pos != string::npos) {
+                    displayPortPartnerPath = displayPortPartnerPath.substr(0, pos) + "/mode1/active";
+                }
+                if (!WriteStringToFile("1", displayPortPartnerPath)) {
+                    ALOGE("Failed to enable DisplayPort Alt Mode on partner at %s",
+                            displayPortPartnerPath.c_str());
+                } else {
+                    ALOGI("Successfully enabled DisplayPort Alt Mode on partner at %s",
+                            displayPortPartnerPath.c_str());
+                    setupDisplayPortPoll();
+                }
+            }
         }
     } else {
         if (!WriteStringToFile("1", ID_PATH)) {
@@ -141,6 +163,27 @@ ScopedAStatus Usb::enableUsbData(const string& in_portName, bool in_enable,
             ALOGE("Gadget cannot be pulled down");
             result = false;
         }
+
+        if (getDisplayPortUsbPathHelper(&displayPortPartnerPath) == Status::SUCCESS) {
+            size_t pos = displayPortPartnerPath.find("/displayport");
+            if (pos != string::npos) {
+                displayPortPartnerPath = displayPortPartnerPath.substr(0, pos) + "/mode1/active";
+            }
+            if (!WriteStringToFile("0", displayPortPartnerPath)) {
+                ALOGE("Failed to disable DisplayPort Alt Mode on partner at %s",
+                        displayPortPartnerPath.c_str());
+            } else {
+                ALOGI("Successfully disabled DisplayPort Alt Mode on partner at %s",
+                        displayPortPartnerPath.c_str());
+                shutdownDisplayPortPoll(true);
+            }
+        }
+
+        if (!WriteStringToFile("0", DISPLAYPORT_ACTIVE_PATH)) {
+            ALOGE("Failed to disable DisplayPort Alt Mode on port");
+        } else {
+            ALOGI("Successfully disabled DisplayPort Alt Mode on port");
+        }
     }
 
     if (result) {

usb/usb/Usb.h

@@ -59,6 +59,8 @@ constexpr char kGadgetName[] = "11210000.dwc3";
 #define VBUS_PATH NEW_UDC_PATH "dwc3_exynos_otg_b_sess"
 #define USB_DATA_PATH NEW_UDC_PATH "usb_data_enabled"
 
+#define DISPLAYPORT_ACTIVE_PATH "/sys/class/typec/port0/port0.0/mode1/active"
+
 #define LINK_TRAINING_STATUS_UNKNOWN "0"
 #define LINK_TRAINING_STATUS_SUCCESS "1"
 #define LINK_TRAINING_STATUS_FAILURE "2"

usb/usb/android.hardware.usb-service.rc

@@ -8,6 +8,7 @@ on post-fs
     chown root system /sys/class/typec/port0/power_role
     chown root system /sys/class/typec/port0/data_role
     chown root system /sys/class/typec/port0/port_type
+    chown root system /sys/class/typec/port0/port0.0/mode1/active
     chown root system /sys/devices/platform/10cb0000.hsi2c/i2c-0/0-0025/contaminant_detection
     chown root system /sys/devices/platform/10cb0000.hsi2c/i2c-1/1-0025/contaminant_detection
     chown root system /sys/devices/platform/10cb0000.hsi2c/i2c-2/2-0025/contaminant_detection
@@ -80,6 +81,7 @@ on post-fs
     chmod 664 /sys/class/typec/port0/power_role
     chmod 664 /sys/class/typec/port0/data_role
     chmod 664 /sys/class/typec/port0/port_type
+    chmod 664 /sys/class/typec/port0/port0.0/mode1/active
     chmod 664 /sys/devices/platform/11110000.usb/dwc3_exynos_otg_b_sess
     chmod 664 /sys/devices/platform/11110000.usb/dwc3_exynos_otg_id
     chmod 664 /sys/devices/platform/11110000.usb/usb_data_enabled