310 lines
10 KiB
C++
310 lines
10 KiB
C++
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "usb_client.h"
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#include <endian.h>
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#include <fcntl.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/functionfs.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <android-base/logging.h>
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#include <android-base/properties.h>
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constexpr int kMaxPacketSizeFs = 64;
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constexpr int kMaxPacketSizeHs = 512;
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constexpr int kMaxPacketsizeSs = 1024;
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constexpr size_t kFbFfsNumBufs = 16;
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constexpr size_t kFbFfsBufSize = 16384;
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constexpr const char* kUsbFfsFastbootEp0 = "/dev/usb-ffs/fastboot/ep0";
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constexpr const char* kUsbFfsFastbootOut = "/dev/usb-ffs/fastboot/ep1";
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constexpr const char* kUsbFfsFastbootIn = "/dev/usb-ffs/fastboot/ep2";
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struct FuncDesc {
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struct usb_interface_descriptor intf;
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struct usb_endpoint_descriptor_no_audio source;
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struct usb_endpoint_descriptor_no_audio sink;
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} __attribute__((packed));
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struct SsFuncDesc {
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struct usb_interface_descriptor intf;
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struct usb_endpoint_descriptor_no_audio source;
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struct usb_ss_ep_comp_descriptor source_comp;
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struct usb_endpoint_descriptor_no_audio sink;
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struct usb_ss_ep_comp_descriptor sink_comp;
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} __attribute__((packed));
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struct DescV2 {
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struct usb_functionfs_descs_head_v2 header;
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// The rest of the structure depends on the flags in the header.
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__le32 fs_count;
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__le32 hs_count;
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__le32 ss_count;
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struct FuncDesc fs_descs, hs_descs;
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struct SsFuncDesc ss_descs;
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} __attribute__((packed));
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struct usb_interface_descriptor fastboot_interface = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = 0,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
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.bInterfaceSubClass = 66,
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.bInterfaceProtocol = 3,
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.iInterface = 1, /* first string from the provided table */
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};
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static struct FuncDesc fs_descriptors = {
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.intf = fastboot_interface,
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.source =
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{
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.bLength = sizeof(fs_descriptors.source),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 1 | USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = kMaxPacketSizeFs,
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},
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.sink =
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{
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.bLength = sizeof(fs_descriptors.sink),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 1 | USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = kMaxPacketSizeFs,
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},
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};
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static struct FuncDesc hs_descriptors = {
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.intf = fastboot_interface,
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.source =
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{
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.bLength = sizeof(hs_descriptors.source),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 1 | USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = kMaxPacketSizeHs,
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},
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.sink =
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{
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.bLength = sizeof(hs_descriptors.sink),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 1 | USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = kMaxPacketSizeHs,
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},
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};
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static struct SsFuncDesc ss_descriptors = {
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.intf = fastboot_interface,
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.source =
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{
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.bLength = sizeof(ss_descriptors.source),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 1 | USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = kMaxPacketsizeSs,
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},
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.source_comp =
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{
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.bLength = sizeof(ss_descriptors.source_comp),
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
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.bMaxBurst = 15,
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},
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.sink =
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{
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.bLength = sizeof(ss_descriptors.sink),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 1 | USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = kMaxPacketsizeSs,
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},
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.sink_comp =
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{
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.bLength = sizeof(ss_descriptors.sink_comp),
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
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.bMaxBurst = 15,
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},
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};
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#define STR_INTERFACE_ "fastbootd"
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static const struct {
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struct usb_functionfs_strings_head header;
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struct {
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__le16 code;
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const char str1[sizeof(STR_INTERFACE_)];
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} __attribute__((packed)) lang0;
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} __attribute__((packed)) strings = {
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.header =
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{
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.magic = htole32(FUNCTIONFS_STRINGS_MAGIC),
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.length = htole32(sizeof(strings)),
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.str_count = htole32(1),
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.lang_count = htole32(1),
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},
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.lang0 =
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{
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htole16(0x0409), /* en-us */
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STR_INTERFACE_,
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},
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};
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static struct DescV2 v2_descriptor = {
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.header =
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{
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.magic = htole32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
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.length = htole32(sizeof(v2_descriptor)),
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.flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC |
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FUNCTIONFS_HAS_SS_DESC,
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},
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.fs_count = 3,
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.hs_count = 3,
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.ss_count = 5,
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.fs_descs = fs_descriptors,
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.hs_descs = hs_descriptors,
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.ss_descs = ss_descriptors,
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};
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// Reimplementing since usb_ffs_close() does not close the control FD.
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static void CloseFunctionFs(usb_handle* h) {
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h->bulk_in.reset();
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h->bulk_out.reset();
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h->control.reset();
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}
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static bool InitFunctionFs(usb_handle* h) {
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LOG(INFO) << "initializing functionfs";
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if (h->control < 0) { // might have already done this before
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LOG(INFO) << "opening control endpoint " << kUsbFfsFastbootEp0;
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h->control.reset(open(kUsbFfsFastbootEp0, O_RDWR));
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if (h->control < 0) {
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PLOG(ERROR) << "cannot open control endpoint " << kUsbFfsFastbootEp0;
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goto err;
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}
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auto ret = write(h->control.get(), &v2_descriptor, sizeof(v2_descriptor));
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if (ret < 0) {
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PLOG(ERROR) << "cannot write descriptors " << kUsbFfsFastbootEp0;
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goto err;
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}
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ret = write(h->control.get(), &strings, sizeof(strings));
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if (ret < 0) {
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PLOG(ERROR) << "cannot write strings " << kUsbFfsFastbootEp0;
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goto err;
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}
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// Signal only when writing the descriptors to ffs
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android::base::SetProperty("sys.usb.ffs.ready", "1");
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}
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h->bulk_out.reset(open(kUsbFfsFastbootOut, O_RDONLY));
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if (h->bulk_out < 0) {
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PLOG(ERROR) << "cannot open bulk-out endpoint " << kUsbFfsFastbootOut;
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goto err;
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}
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h->bulk_in.reset(open(kUsbFfsFastbootIn, O_WRONLY));
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if (h->bulk_in < 0) {
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PLOG(ERROR) << "cannot open bulk-in endpoint " << kUsbFfsFastbootIn;
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goto err;
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}
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h->read_aiob.fd = h->bulk_out.get();
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h->write_aiob.fd = h->bulk_in.get();
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h->reads_zero_packets = false;
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return true;
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err:
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CloseFunctionFs(h);
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return false;
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}
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ClientUsbTransport::ClientUsbTransport()
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: handle_(std::unique_ptr<usb_handle>(create_usb_handle(kFbFfsNumBufs, kFbFfsBufSize))) {
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if (!InitFunctionFs(handle_.get())) {
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handle_.reset(nullptr);
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}
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}
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ssize_t ClientUsbTransport::Read(void* data, size_t len) {
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if (handle_ == nullptr) {
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LOG(ERROR) << "ClientUsbTransport: no handle";
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return -1;
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}
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if (len > SSIZE_MAX) {
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LOG(ERROR) << "ClientUsbTransport: maximum length exceeds bounds";
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return -1;
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}
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char* char_data = static_cast<char*>(data);
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size_t bytes_read_total = 0;
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while (bytes_read_total < len) {
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auto bytes_to_read = std::min(len - bytes_read_total, kFbFfsNumBufs * kFbFfsBufSize);
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auto bytes_read_now =
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handle_->read(handle_.get(), char_data, bytes_to_read, true /* allow_partial */);
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if (bytes_read_now < 0) {
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PLOG(ERROR) << "ClientUsbTransport: read failed";
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return bytes_read_total == 0 ? -1 : bytes_read_total;
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}
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bytes_read_total += bytes_read_now;
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char_data += bytes_read_now;
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if (static_cast<size_t>(bytes_read_now) < bytes_to_read) {
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break;
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}
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}
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return bytes_read_total;
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}
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ssize_t ClientUsbTransport::Write(const void* data, size_t len) {
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if (handle_ == nullptr || len > SSIZE_MAX) {
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return -1;
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}
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const char* char_data = reinterpret_cast<const char*>(data);
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size_t bytes_written_total = 0;
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while (bytes_written_total < len) {
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auto bytes_to_write = std::min(len - bytes_written_total, kFbFfsNumBufs * kFbFfsBufSize);
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auto bytes_written_now = handle_->write(handle_.get(), char_data, bytes_to_write);
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if (bytes_written_now < 0) {
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return bytes_written_total == 0 ? -1 : bytes_written_total;
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}
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bytes_written_total += bytes_written_now;
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char_data += bytes_written_now;
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if (static_cast<size_t>(bytes_written_now) < bytes_to_write) {
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break;
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}
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}
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return bytes_written_total;
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}
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int ClientUsbTransport::Close() {
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if (handle_ == nullptr) {
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return -1;
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}
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CloseFunctionFs(handle_.get());
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return 0;
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}
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int ClientUsbTransport::Reset() {
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return 0;
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}
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