From eafdae6687d60ed7326f1b7f17ef54d6e2d9a782 Mon Sep 17 00:00:00 2001
From: Avichal Rakesh <arakesh@google.com>
Date: Fri, 6 Jan 2023 02:47:19 -0800
Subject: [PATCH] UsbGadget: Add support for UVC function

UVC is a new USB function supported in Android. This CL adds UVC as a
valid function and gives it a new pid of 0x4ee[de]. UVC function is
guarded by the property `ro.usb.uvc.enabled`. When this property is set
to false, UVC won't be considered as a valid gadget function.

Bug: 242344221
Test: Manually tested that the UVC function is successfully configured
Change-Id: I5ba45ebb11d265b843dfde21407bc5bab1d070c9
---
 usb/gadget/UsbGadget.cpp | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/usb/gadget/UsbGadget.cpp b/usb/gadget/UsbGadget.cpp
index 93138635..2000445d 100644
--- a/usb/gadget/UsbGadget.cpp
+++ b/usb/gadget/UsbGadget.cpp
@@ -26,6 +26,8 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include <android-base/properties.h>
+
 #include <aidl/android/frameworks/stats/IStats.h>
 
 namespace aidl {
@@ -40,6 +42,9 @@ constexpr char kI2CPath[] = "/sys/devices/platform/10d50000.hsi2c/i2c-";
 constexpr char kAccessoryLimitCurrent[] = "i2c-max77759tcpc/usb_limit_accessory_current";
 constexpr char kAccessoryLimitCurrentEnable[] = "i2c-max77759tcpc/usb_limit_accessory_enable";
 
+using ::android::base::GetBoolProperty;
+using ::android::hardware::google::pixel::usb::kUvcEnabled;
+
 UsbGadget::UsbGadget() : mGadgetIrqPath("") {
     if (access(OS_DESC_PATH, R_OK) != 0) {
         ALOGE("configfs setup not done yet");
@@ -154,8 +159,8 @@ Status UsbGadget::tearDownGadget() {
     return Status::SUCCESS;
 }
 
-static Status validateAndSetVidPid(uint64_t functions) {
-    Status ret = Status::SUCCESS;
+static Status validateAndSetVidPid(int64_t functions) {
+    Status ret;
     std::string vendorFunctions = getVendorFunctions();
 
     switch (functions) {
@@ -302,6 +307,28 @@ static Status validateAndSetVidPid(uint64_t functions) {
                 ret = Status(setVidPid("0x18d1", "0x4eec"));
             }
             break;
+        case GadgetFunction::UVC:
+            if (!(vendorFunctions == "user" || vendorFunctions == "")) {
+                ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
+                ret = Status::CONFIGURATION_NOT_SUPPORTED;
+            } else if (!GetBoolProperty(kUvcEnabled, false)) {
+                ALOGE("UVC function not enabled by config");
+                ret = Status::CONFIGURATION_NOT_SUPPORTED;
+            } else {
+                ret = Status(setVidPid("0x18d1", "0x4eed"));
+            }
+            break;
+        case GadgetFunction::ADB | GadgetFunction::UVC:
+            if (!(vendorFunctions == "user" || vendorFunctions == "")) {
+                ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
+                ret = Status::CONFIGURATION_NOT_SUPPORTED;
+            } else if (!GetBoolProperty(kUvcEnabled, false)) {
+                ALOGE("UVC function not enabled by config");
+                ret = Status::CONFIGURATION_NOT_SUPPORTED;
+            } else {
+                ret = Status(setVidPid("0x18d1", "0x4eee"));
+            }
+            break;
         default:
             ALOGE("Combination not supported");
             ret = Status::CONFIGURATION_NOT_SUPPORTED;