pa-fazil
/
android_system_core
mirror of https://github.com/fazilsheik96/android_system_core.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
android_system_core/adb/daemon/usb_ffs.cpp

321 lines
11 KiB
C++
Raw Blame History

/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define TRACE_TAG USB
#include "sysdeps.h"
#include <linux/usb/ch9.h>
#include <linux/usb/functionfs.h>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/unique_fd.h>
#include "adb.h"
#include "adbd/usb.h"
#define MAX_PACKET_SIZE_FS 64
#define MAX_PACKET_SIZE_HS 512
#define MAX_PACKET_SIZE_SS 1024
#define USB_FFS_BULK_SIZE 16384
// Number of buffers needed to fit MAX_PAYLOAD, with an extra for ZLPs.
#define USB_FFS_NUM_BUFS ((4 * MAX_PAYLOAD / USB_FFS_BULK_SIZE) + 1)
#define USB_EXT_PROP_UNICODE 1
#define cpu_to_le16(x) htole16(x)
#define cpu_to_le32(x) htole32(x)
// clang-format off
struct func_desc {
struct usb_interface_descriptor intf;
struct usb_endpoint_descriptor_no_audio source;
struct usb_endpoint_descriptor_no_audio sink;
} __attribute__((packed));
struct ss_func_desc {
struct usb_interface_descriptor intf;
struct usb_endpoint_descriptor_no_audio source;
struct usb_ss_ep_comp_descriptor source_comp;
struct usb_endpoint_descriptor_no_audio sink;
struct usb_ss_ep_comp_descriptor sink_comp;
} __attribute__((packed));
struct desc_v1 {
struct usb_functionfs_descs_head_v1 {
__le32 magic;
__le32 length;
__le32 fs_count;
__le32 hs_count;
} __attribute__((packed)) header;
struct func_desc fs_descs, hs_descs;
} __attribute__((packed));
template <size_t PropertyNameLength, size_t PropertyDataLength>
struct usb_os_desc_ext_prop {
uint32_t dwSize = sizeof(*this);
uint32_t dwPropertyDataType = cpu_to_le32(USB_EXT_PROP_UNICODE);
// Property name and value are transmitted as UTF-16, but the kernel only
// accepts ASCII values and performs the conversion for us.
uint16_t wPropertyNameLength = cpu_to_le16(PropertyNameLength);
char bPropertyName[PropertyNameLength];
uint32_t dwPropertyDataLength = cpu_to_le32(PropertyDataLength);
char bProperty[PropertyDataLength];
} __attribute__((packed));
using usb_os_desc_guid_t = usb_os_desc_ext_prop<20, 39>;
usb_os_desc_guid_t os_desc_guid = {
.bPropertyName = "DeviceInterfaceGUID",
.bProperty = "{64379D6C-D531-4BED-BBEC-5A16FC07D6BC}",
};
struct usb_ext_prop_values {
usb_os_desc_guid_t guid;
} __attribute__((packed));
usb_ext_prop_values os_prop_values = {
.guid = os_desc_guid,
};
struct desc_v2 {
struct usb_functionfs_descs_head_v2 header;
// The rest of the structure depends on the flags in the header.
__le32 fs_count;
__le32 hs_count;
__le32 ss_count;
__le32 os_count;
struct func_desc fs_descs, hs_descs;
struct ss_func_desc ss_descs;
struct usb_os_desc_header os_header;
struct usb_ext_compat_desc os_desc;
struct usb_os_desc_header os_prop_header;
struct usb_ext_prop_values os_prop_values;
} __attribute__((packed));
static struct func_desc fs_descriptors = {
.intf = {
.bLength = sizeof(fs_descriptors.intf),
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0,
.bNumEndpoints = 2,
.bInterfaceClass = ADB_CLASS,
.bInterfaceSubClass = ADB_SUBCLASS,
.bInterfaceProtocol = ADB_PROTOCOL,
.iInterface = 1, /* first string from the provided table */
},
.source = {
.bLength = sizeof(fs_descriptors.source),
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 1 | USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = MAX_PACKET_SIZE_FS,
},
.sink = {
.bLength = sizeof(fs_descriptors.sink),
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 2 | USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = MAX_PACKET_SIZE_FS,
},
};
static struct func_desc hs_descriptors = {
.intf = {
.bLength = sizeof(hs_descriptors.intf),
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0,
.bNumEndpoints = 2,
.bInterfaceClass = ADB_CLASS,
.bInterfaceSubClass = ADB_SUBCLASS,
.bInterfaceProtocol = ADB_PROTOCOL,
.iInterface = 1, /* first string from the provided table */
},
.source = {
.bLength = sizeof(hs_descriptors.source),
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 1 | USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = MAX_PACKET_SIZE_HS,
},
.sink = {
.bLength = sizeof(hs_descriptors.sink),
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 2 | USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = MAX_PACKET_SIZE_HS,
},
};
static struct ss_func_desc ss_descriptors = {
.intf = {
.bLength = sizeof(ss_descriptors.intf),
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0,
.bNumEndpoints = 2,
.bInterfaceClass = ADB_CLASS,
.bInterfaceSubClass = ADB_SUBCLASS,
.bInterfaceProtocol = ADB_PROTOCOL,
.iInterface = 1, /* first string from the provided table */
},
.source = {
.bLength = sizeof(ss_descriptors.source),
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 1 | USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = MAX_PACKET_SIZE_SS,
},
.source_comp = {
.bLength = sizeof(ss_descriptors.source_comp),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
.bMaxBurst = 4,
},
.sink = {
.bLength = sizeof(ss_descriptors.sink),
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 2 | USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = MAX_PACKET_SIZE_SS,
},
.sink_comp = {
.bLength = sizeof(ss_descriptors.sink_comp),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
.bMaxBurst = 4,
},
};
struct usb_ext_compat_desc os_desc_compat = {
.bFirstInterfaceNumber = 0,
.Reserved1 = cpu_to_le32(1),
.CompatibleID = { 'W', 'I', 'N', 'U', 'S', 'B', '\0', '\0'},
.SubCompatibleID = {0},
.Reserved2 = {0},
};
static struct usb_os_desc_header os_desc_header = {
.interface = cpu_to_le32(0),
.dwLength = cpu_to_le32(sizeof(os_desc_header) + sizeof(os_desc_compat)),
.bcdVersion = cpu_to_le32(1),
.wIndex = cpu_to_le32(4),
.bCount = cpu_to_le32(1),
.Reserved = cpu_to_le32(0),
};
static struct usb_os_desc_header os_prop_header = {
.interface = cpu_to_le32(0),
.dwLength = cpu_to_le32(sizeof(os_desc_header) + sizeof(os_prop_values)),
.bcdVersion = cpu_to_le32(1),
.wIndex = cpu_to_le32(5),
.wCount = cpu_to_le16(1),
};
#define STR_INTERFACE_ "ADB Interface"
static const struct {
struct usb_functionfs_strings_head header;
struct {
__le16 code;
const char str1[sizeof(STR_INTERFACE_)];
} __attribute__((packed)) lang0;
} __attribute__((packed)) strings = {
.header = {
.magic = cpu_to_le32(FUNCTIONFS_STRINGS_MAGIC),
.length = cpu_to_le32(sizeof(strings)),
.str_count = cpu_to_le32(1),
.lang_count = cpu_to_le32(1),
},
.lang0 = {
cpu_to_le16(0x0409), /* en-us */
STR_INTERFACE_,
},
};
// clang-format on
bool open_functionfs(android::base::unique_fd* out_control, android::base::unique_fd* out_bulk_out,
android::base::unique_fd* out_bulk_in) {
unique_fd control, bulk_out, bulk_in;
struct desc_v1 v1_descriptor = {};
struct desc_v2 v2_descriptor = {};
v2_descriptor.header.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2);
v2_descriptor.header.length = cpu_to_le32(sizeof(v2_descriptor));
v2_descriptor.header.flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC |
FUNCTIONFS_HAS_SS_DESC | FUNCTIONFS_HAS_MS_OS_DESC;
v2_descriptor.fs_count = 3;
v2_descriptor.hs_count = 3;
v2_descriptor.ss_count = 5;
v2_descriptor.os_count = 2;
v2_descriptor.fs_descs = fs_descriptors;
v2_descriptor.hs_descs = hs_descriptors;
v2_descriptor.ss_descs = ss_descriptors;
v2_descriptor.os_header = os_desc_header;
v2_descriptor.os_desc = os_desc_compat;
v2_descriptor.os_prop_header = os_prop_header;
v2_descriptor.os_prop_values = os_prop_values;
if (out_control->get() < 0) { // might have already done this before
LOG(INFO) << "opening control endpoint " << USB_FFS_ADB_EP0;
control.reset(adb_open(USB_FFS_ADB_EP0, O_RDWR));
if (control < 0) {
PLOG(ERROR) << "cannot open control endpoint " << USB_FFS_ADB_EP0;
return false;
}
if (adb_write(control.get(), &v2_descriptor, sizeof(v2_descriptor)) < 0) {
D("[ %s: Switching to V1_descriptor format errno=%s ]", USB_FFS_ADB_EP0,
strerror(errno));
v1_descriptor.header.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC);
v1_descriptor.header.length = cpu_to_le32(sizeof(v1_descriptor));
v1_descriptor.header.fs_count = 3;
v1_descriptor.header.hs_count = 3;
v1_descriptor.fs_descs = fs_descriptors;
v1_descriptor.hs_descs = hs_descriptors;
if (adb_write(control.get(), &v1_descriptor, sizeof(v1_descriptor)) < 0) {
PLOG(ERROR) << "failed to write USB descriptors";
return false;
}
}
if (adb_write(control.get(), &strings, sizeof(strings)) < 0) {
PLOG(ERROR) << "failed to write USB strings";
return false;
}
// Signal only when writing the descriptors to ffs
android::base::SetProperty("sys.usb.ffs.ready", "1");
}
bulk_out.reset(adb_open(USB_FFS_ADB_OUT, O_RDONLY));
if (bulk_out < 0) {
PLOG(ERROR) << "cannot open bulk-out endpoint " << USB_FFS_ADB_OUT;
return false;
}
bulk_in.reset(adb_open(USB_FFS_ADB_IN, O_WRONLY));
if (bulk_in < 0) {
PLOG(ERROR) << "cannot open bulk-in endpoint " << USB_FFS_ADB_IN;
return false;
}
*out_control = std::move(control);
*out_bulk_in = std::move(bulk_in);
*out_bulk_out = std::move(bulk_out);
return true;
}
Reference in New Issue View Git Blame Copy Permalink