Switch usb_linux_client to C++.

Change-Id: I8172e81e6c4665aa16e9e8e0c33b048dbb9ad848

1 files changed, 515 insertions, 0 deletions

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);
+}