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/*
* 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 <cutils/properties.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));
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,
},
};
#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 (true) {
// 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 = unix_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)
{
D("about to read (fd=%d, len=%d)\n", h->fd, len);
while (len > 0) {
// The kernel implementation of adb_read in f_adb.c doesn't support
// reads larger then 4096 bytes. Read the data in 4096 byte chunks to
// avoid the issue. (The ffs implementation doesn't have this limit.)
int bytes_to_read = len < 4096 ? len : 4096;
int n = unix_read(h->fd, data, bytes_to_read);
if (n != bytes_to_read) {
D("ERROR: fd = %d, n = %d, errno = %d (%s)\n",
h->fd, n, errno, strerror(errno));
return -1;
}
len -= n;
data = ((char*)data) + n;
}
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);
unix_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)));
if (h == nullptr) fatal("couldn't allocate 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");
if (!adb_thread_create(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 (true) {
// 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 (true) {
init_functionfs(usb);
if (usb->control >= 0 && usb->bulk_in >= 0 && usb->bulk_out >= 0)
break;
adb_sleep_ms(1000);
}
property_set("sys.usb.ffs.ready", "1");
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) ]\n", h->bulk_in, errno);
err = ioctl(h->bulk_out, FUNCTIONFS_CLEAR_HALT);
if (err < 0)
D("[ kick: sink (fd=%d) clear halt failed (%d) ]\n", 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)));
if (h == nullptr) fatal("couldn't allocate 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");
if (!adb_thread_create(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();
}
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);
}