Switch usb_linux_client to C++.
Change-Id: I8172e81e6c4665aa16e9e8e0c33b048dbb9ad848
diff --git a/adb/usb_linux_client.cpp b/adb/usb_linux_client.cpp
new file mode 100644
index 0000000..8d670f8
--- /dev/null
+++ b/adb/usb_linux_client.cpp
@@ -0,0 +1,515 @@
+/*
+ * Copyright (C) 2007 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 TRACE_USB
+
+#include "sysdeps.h"
+
+#include <dirent.h>
+#include <errno.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/functionfs.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "adb.h"
+#include "transport.h"
+
+#define MAX_PACKET_SIZE_FS 64
+#define MAX_PACKET_SIZE_HS 512
+#define MAX_PACKET_SIZE_SS 1024
+
+#define cpu_to_le16(x) htole16(x)
+#define cpu_to_le32(x) htole32(x)
+
+struct usb_handle
+{
+ adb_cond_t notify;
+ adb_mutex_t lock;
+
+ int (*write)(usb_handle *h, const void *data, int len);
+ int (*read)(usb_handle *h, void *data, int len);
+ void (*kick)(usb_handle *h);
+
+ // Legacy f_adb
+ int fd;
+
+ // FunctionFS
+ int control;
+ int bulk_out; /* "out" from the host's perspective => source for adbd */
+ int bulk_in; /* "in" from the host's perspective => sink for adbd */
+};
+
+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 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));
+
+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;
+ struct func_desc fs_descs, hs_descs;
+} __attribute__((packed));
+
+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,
+ },
+};
+
+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,
+ },
+};
+
+#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_,
+ },
+};
+
+
+
+static void *usb_adb_open_thread(void *x)
+{
+ struct usb_handle *usb = (struct usb_handle *)x;
+ int fd;
+
+ while (1) {
+ // wait until the USB device needs opening
+ adb_mutex_lock(&usb->lock);
+ while (usb->fd != -1)
+ adb_cond_wait(&usb->notify, &usb->lock);
+ adb_mutex_unlock(&usb->lock);
+
+ D("[ usb_thread - opening device ]\n");
+ do {
+ /* XXX use inotify? */
+ fd = unix_open("/dev/android_adb", O_RDWR);
+ if (fd < 0) {
+ // to support older kernels
+ fd = unix_open("/dev/android", O_RDWR);
+ }
+ if (fd < 0) {
+ adb_sleep_ms(1000);
+ }
+ } while (fd < 0);
+ D("[ opening device succeeded ]\n");
+
+ close_on_exec(fd);
+ usb->fd = fd;
+
+ D("[ usb_thread - registering device ]\n");
+ register_usb_transport(usb, 0, 0, 1);
+ }
+
+ // never gets here
+ return 0;
+}
+
+static int usb_adb_write(usb_handle *h, const void *data, int len)
+{
+ int n;
+
+ D("about to write (fd=%d, len=%d)\n", h->fd, len);
+ n = adb_write(h->fd, data, len);
+ if(n != len) {
+ D("ERROR: fd = %d, n = %d, errno = %d (%s)\n",
+ h->fd, n, errno, strerror(errno));
+ return -1;
+ }
+ D("[ done fd=%d ]\n", h->fd);
+ return 0;
+}
+
+static int usb_adb_read(usb_handle *h, void *data, int len)
+{
+ int n;
+
+ D("about to read (fd=%d, len=%d)\n", h->fd, len);
+ n = adb_read(h->fd, data, len);
+ if(n != len) {
+ D("ERROR: fd = %d, n = %d, errno = %d (%s)\n",
+ h->fd, n, errno, strerror(errno));
+ return -1;
+ }
+ D("[ done fd=%d ]\n", h->fd);
+ return 0;
+}
+
+static void usb_adb_kick(usb_handle *h)
+{
+ D("usb_kick\n");
+ adb_mutex_lock(&h->lock);
+ adb_close(h->fd);
+ h->fd = -1;
+
+ // notify usb_adb_open_thread that we are disconnected
+ adb_cond_signal(&h->notify);
+ adb_mutex_unlock(&h->lock);
+}
+
+static void usb_adb_init()
+{
+ usb_handle* h = reinterpret_cast<usb_handle*>(calloc(1, sizeof(usb_handle)));
+ h->write = usb_adb_write;
+ h->read = usb_adb_read;
+ h->kick = usb_adb_kick;
+ h->fd = -1;
+
+ adb_cond_init(&h->notify, 0);
+ adb_mutex_init(&h->lock, 0);
+
+ // Open the file /dev/android_adb_enable to trigger
+ // the enabling of the adb USB function in the kernel.
+ // We never touch this file again - just leave it open
+ // indefinitely so the kernel will know when we are running
+ // and when we are not.
+ int fd = unix_open("/dev/android_adb_enable", O_RDWR);
+ if (fd < 0) {
+ D("failed to open /dev/android_adb_enable\n");
+ } else {
+ close_on_exec(fd);
+ }
+
+ D("[ usb_init - starting thread ]\n");
+ adb_thread_t tid;
+ if(adb_thread_create(&tid, usb_adb_open_thread, h)){
+ fatal_errno("cannot create usb thread");
+ }
+}
+
+
+static void init_functionfs(struct usb_handle *h)
+{
+ ssize_t ret;
+ 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;
+ v2_descriptor.fs_count = 3;
+ v2_descriptor.hs_count = 3;
+ v2_descriptor.fs_descs = fs_descriptors;
+ v2_descriptor.hs_descs = hs_descriptors;
+
+ if (h->control < 0) { // might have already done this before
+ D("OPENING %s\n", USB_FFS_ADB_EP0);
+ h->control = adb_open(USB_FFS_ADB_EP0, O_RDWR);
+ if (h->control < 0) {
+ D("[ %s: cannot open control endpoint: errno=%d]\n", USB_FFS_ADB_EP0, errno);
+ goto err;
+ }
+
+ ret = adb_write(h->control, &v2_descriptor, sizeof(v2_descriptor));
+ if (ret < 0) {
+ 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;
+ D("[ %s: Switching to V1_descriptor format errno=%d ]\n", USB_FFS_ADB_EP0, errno);
+ ret = adb_write(h->control, &v1_descriptor, sizeof(v1_descriptor));
+ if (ret < 0) {
+ D("[ %s: write descriptors failed: errno=%d ]\n", USB_FFS_ADB_EP0, errno);
+ goto err;
+ }
+ }
+
+ ret = adb_write(h->control, &strings, sizeof(strings));
+ if (ret < 0) {
+ D("[ %s: writing strings failed: errno=%d]\n", USB_FFS_ADB_EP0, errno);
+ goto err;
+ }
+ }
+
+ h->bulk_out = adb_open(USB_FFS_ADB_OUT, O_RDWR);
+ if (h->bulk_out < 0) {
+ D("[ %s: cannot open bulk-out ep: errno=%d ]\n", USB_FFS_ADB_OUT, errno);
+ goto err;
+ }
+
+ h->bulk_in = adb_open(USB_FFS_ADB_IN, O_RDWR);
+ if (h->bulk_in < 0) {
+ D("[ %s: cannot open bulk-in ep: errno=%d ]\n", USB_FFS_ADB_IN, errno);
+ goto err;
+ }
+
+ return;
+
+err:
+ if (h->bulk_in > 0) {
+ adb_close(h->bulk_in);
+ h->bulk_in = -1;
+ }
+ if (h->bulk_out > 0) {
+ adb_close(h->bulk_out);
+ h->bulk_out = -1;
+ }
+ if (h->control > 0) {
+ adb_close(h->control);
+ h->control = -1;
+ }
+ return;
+}
+
+static void *usb_ffs_open_thread(void *x)
+{
+ struct usb_handle *usb = (struct usb_handle *)x;
+
+ while (1) {
+ // wait until the USB device needs opening
+ adb_mutex_lock(&usb->lock);
+ while (usb->control != -1 && usb->bulk_in != -1 && usb->bulk_out != -1)
+ adb_cond_wait(&usb->notify, &usb->lock);
+ adb_mutex_unlock(&usb->lock);
+
+ while (1) {
+ init_functionfs(usb);
+
+ if (usb->control >= 0 && usb->bulk_in >= 0 && usb->bulk_out >= 0)
+ break;
+
+ adb_sleep_ms(1000);
+ }
+
+ D("[ usb_thread - registering device ]\n");
+ register_usb_transport(usb, 0, 0, 1);
+ }
+
+ // never gets here
+ return 0;
+}
+
+static int bulk_write(int bulk_in, const uint8_t* buf, size_t length)
+{
+ size_t count = 0;
+ int ret;
+
+ do {
+ ret = adb_write(bulk_in, buf + count, length - count);
+ if (ret < 0) {
+ if (errno != EINTR)
+ return ret;
+ } else {
+ count += ret;
+ }
+ } while (count < length);
+
+ D("[ bulk_write done fd=%d ]\n", bulk_in);
+ return count;
+}
+
+static int usb_ffs_write(usb_handle* h, const void* data, int len)
+{
+ D("about to write (fd=%d, len=%d)\n", h->bulk_in, len);
+ int n = bulk_write(h->bulk_in, reinterpret_cast<const uint8_t*>(data), len);
+ if (n != len) {
+ D("ERROR: fd = %d, n = %d: %s\n", h->bulk_in, n, strerror(errno));
+ return -1;
+ }
+ D("[ done fd=%d ]\n", h->bulk_in);
+ return 0;
+}
+
+static int bulk_read(int bulk_out, uint8_t* buf, size_t length)
+{
+ size_t count = 0;
+ int ret;
+
+ do {
+ ret = adb_read(bulk_out, buf + count, length - count);
+ if (ret < 0) {
+ if (errno != EINTR) {
+ D("[ bulk_read failed fd=%d length=%zu count=%zu ]\n",
+ bulk_out, length, count);
+ return ret;
+ }
+ } else {
+ count += ret;
+ }
+ } while (count < length);
+
+ return count;
+}
+
+static int usb_ffs_read(usb_handle* h, void* data, int len)
+{
+ D("about to read (fd=%d, len=%d)\n", h->bulk_out, len);
+ int n = bulk_read(h->bulk_out, reinterpret_cast<uint8_t*>(data), len);
+ if (n != len) {
+ D("ERROR: fd = %d, n = %d: %s\n", h->bulk_out, n, strerror(errno));
+ return -1;
+ }
+ D("[ done fd=%d ]\n", h->bulk_out);
+ return 0;
+}
+
+static void usb_ffs_kick(usb_handle *h)
+{
+ int err;
+
+ err = ioctl(h->bulk_in, FUNCTIONFS_CLEAR_HALT);
+ if (err < 0)
+ D("[ kick: source (fd=%d) clear halt failed (%d) ]", h->bulk_in, errno);
+
+ err = ioctl(h->bulk_out, FUNCTIONFS_CLEAR_HALT);
+ if (err < 0)
+ D("[ kick: sink (fd=%d) clear halt failed (%d) ]", h->bulk_out, errno);
+
+ adb_mutex_lock(&h->lock);
+
+ // don't close ep0 here, since we may not need to reinitialize it with
+ // the same descriptors again. if however ep1/ep2 fail to re-open in
+ // init_functionfs, only then would we close and open ep0 again.
+ adb_close(h->bulk_out);
+ adb_close(h->bulk_in);
+ h->bulk_out = h->bulk_in = -1;
+
+ // notify usb_ffs_open_thread that we are disconnected
+ adb_cond_signal(&h->notify);
+ adb_mutex_unlock(&h->lock);
+}
+
+static void usb_ffs_init()
+{
+ D("[ usb_init - using FunctionFS ]\n");
+
+ usb_handle* h = reinterpret_cast<usb_handle*>(calloc(1, sizeof(usb_handle)));
+ h->write = usb_ffs_write;
+ h->read = usb_ffs_read;
+ h->kick = usb_ffs_kick;
+ h->control = -1;
+ h->bulk_out = -1;
+ h->bulk_out = -1;
+
+ adb_cond_init(&h->notify, 0);
+ adb_mutex_init(&h->lock, 0);
+
+ D("[ usb_init - starting thread ]\n");
+ adb_thread_t tid;
+ if (adb_thread_create(&tid, usb_ffs_open_thread, h)){
+ fatal_errno("[ cannot create usb thread ]\n");
+ }
+}
+
+void usb_init()
+{
+ if (access(USB_FFS_ADB_EP0, F_OK) == 0)
+ usb_ffs_init();
+ else
+ usb_adb_init();
+}
+
+void usb_cleanup()
+{
+}
+
+int usb_write(usb_handle *h, const void *data, int len)
+{
+ return h->write(h, data, len);
+}
+
+int usb_read(usb_handle *h, void *data, int len)
+{
+ return h->read(h, data, len);
+}
+int usb_close(usb_handle *h)
+{
+ return 0;
+}
+
+void usb_kick(usb_handle *h)
+{
+ h->kick(h);
+}