| // Copyright 2020 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "typecd/cable.h" |
| |
| #include <base/files/file_enumerator.h> |
| #include <re2/re2.h> |
| |
| namespace { |
| |
| // Ref: |
| // USB PD Spec rev 3.0, v2.0 |
| // Table 6-29: ID Header VDO |
| // Table 6-38: Passive Cable VDO |
| constexpr uint32_t kActiveCableBitMask = (0x4 << 27); |
| constexpr uint32_t kPassiveCableBitMask = (0x3 << 27); |
| |
| constexpr uint32_t kUSBSpeedBitMask = 0x3; |
| constexpr uint32_t kUSBSuperSpeed32Gen1 = 0x1; |
| constexpr uint32_t kUSBSuperSpeed32Or40Gen2 = 0x2; |
| constexpr uint32_t kUSB40SuperSpeedGen3 = 0x3; |
| // Speed values for PD rev 2.0 |
| constexpr uint32_t kUSBSuperSpeed31Gen1 = 0x1; |
| constexpr uint32_t kUSBSuperSpeed31Gen2 = 0x2; |
| |
| constexpr char kSOPPrimeAltModeRegex[] = R"(port(\d+)-plug0.(\d+))"; |
| |
| } // namespace |
| |
| namespace typecd { |
| |
| void Cable::SearchForAltModes(const base::FilePath& plug_syspath) { |
| base::FileEnumerator iter(plug_syspath, false, |
| base::FileEnumerator::DIRECTORIES); |
| for (auto path = iter.Next(); !path.empty(); path = iter.Next()) |
| AddAltMode(path); |
| } |
| |
| bool Cable::AddAltMode(const base::FilePath& mode_syspath) { |
| int port, index; |
| if (!RE2::FullMatch(mode_syspath.BaseName().value(), kSOPPrimeAltModeRegex, |
| &port, &index)) |
| return false; |
| |
| if (IsAltModePresent(index)) { |
| LOG(ERROR) << "Alt mode already registered for syspath " << mode_syspath; |
| return false; |
| } |
| |
| auto alt_mode = AltMode::CreateAltMode(mode_syspath); |
| if (!alt_mode) { |
| LOG(ERROR) << "Error creating alt mode for syspath " << mode_syspath; |
| return false; |
| } |
| |
| alt_modes_.emplace(index, std::move(alt_mode)); |
| LOG(INFO) << "Added SOP' alt mode for port " << port << " index " << index; |
| |
| return true; |
| } |
| |
| void Cable::RemoveAltMode(const base::FilePath& mode_syspath) { |
| int port, index; |
| if (!RE2::FullMatch(mode_syspath.BaseName().value(), kSOPPrimeAltModeRegex, |
| &port, &index)) { |
| LOG(ERROR) << "Couldn't parse alt mode index from syspath " << mode_syspath; |
| return; |
| } |
| |
| auto it = alt_modes_.find(index); |
| if (it == alt_modes_.end()) { |
| LOG(INFO) << "Trying to delete non-existent SOP' alt mode " << index; |
| return; |
| } |
| |
| alt_modes_.erase(it); |
| |
| LOG(INFO) << "Removed SOP' alt mode for port " << port << " index " << index; |
| } |
| |
| bool Cable::IsAltModePresent(int index) { |
| auto it = alt_modes_.find(index); |
| if (it != alt_modes_.end()) { |
| return true; |
| } |
| |
| LOG(INFO) << "SOP' Alt mode not found at index " << index; |
| return false; |
| } |
| |
| AltMode* Cable::GetAltMode(int index) { |
| if (!IsAltModePresent(index)) |
| return nullptr; |
| |
| return alt_modes_.find(index)->second.get(); |
| } |
| |
| // Ref: |
| // USB Type-C Connector Spec, release 2.0 |
| // Figure F-1. |
| bool Cable::TBT3PDIdentityCheck() { |
| // If the cable is active, we don't need to check for speed. |
| if (GetIdHeaderVDO() & kActiveCableBitMask) { |
| LOG(INFO) << "Active cable detected, TBT3 supported."; |
| return true; |
| } |
| |
| if (!(GetIdHeaderVDO() & kPassiveCableBitMask)) { |
| LOG(ERROR) << "Cable has unsupported product type."; |
| return false; |
| } |
| |
| auto usb_speed = GetProductTypeVDO1() & kUSBSpeedBitMask; |
| if (GetPDRevision() == kPDRevision30) { |
| return usb_speed == kUSBSuperSpeed32Gen1 || |
| usb_speed == kUSBSuperSpeed32Or40Gen2 || |
| usb_speed == kUSB40SuperSpeedGen3; |
| } |
| |
| // For PD 2.0 the check is similar, but let's make it explicit. |
| return usb_speed == kUSBSuperSpeed31Gen1 || usb_speed == kUSBSuperSpeed31Gen2; |
| } |
| |
| } // namespace typecd |