diff options
Diffstat (limited to 'fastbootd/usb_linux_client.c')
| -rw-r--r-- | fastbootd/usb_linux_client.c | 353 |
1 files changed, 353 insertions, 0 deletions
diff --git a/fastbootd/usb_linux_client.c b/fastbootd/usb_linux_client.c new file mode 100644 index 0000000..111cf35 --- /dev/null +++ b/fastbootd/usb_linux_client.c @@ -0,0 +1,353 @@ +/* + * 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. + */ + +#include <endian.h> +#include <fcntl.h> +#include <pthread.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include <sys/ioctl.h> +#include <sys/types.h> + +#include <linux/usb/ch9.h> +#include <linux/usb/functionfs.h> + +#include "debug.h" +#include "transport.h" + +#define TRACE_TAG TRACE_USB + +#define MAX_PACKET_SIZE_FS 64 +#define MAX_PACKET_SIZE_HS 512 + +#define cpu_to_le16(x) htole16(x) +#define cpu_to_le32(x) htole32(x) + +#define FASTBOOT_CLASS 0xff +#define FASTBOOT_SUBCLASS 0x42 +#define FASTBOOT_PROTOCOL 0x3 + +#define USB_FFS_FASTBOOT_PATH "/dev/usb-ffs/adb/" +#define USB_FFS_FASTBOOT_EP(x) USB_FFS_FASTBOOT_PATH#x + +#define USB_FFS_FASTBOOT_EP0 USB_FFS_FASTBOOT_EP(ep0) +#define USB_FFS_FASTBOOT_OUT USB_FFS_FASTBOOT_EP(ep1) +#define USB_FFS_FASTBOOT_IN USB_FFS_FASTBOOT_EP(ep2) + +#define READ_BUF_SIZE (16*1024) + +#define container_of(ptr, type, member) \ + ((type*)((char*)(ptr) - offsetof(type, member))) + +struct usb_transport { + struct transport transport; + + pthread_cond_t notify; + pthread_mutex_t lock; + + int control; + int bulk_out; /* "out" from the host's perspective => source for fastbootd */ + int bulk_in; /* "in" from the host's perspective => sink for fastbootd */ +}; + +struct usb_handle { + struct transport_handle handle; +}; + +static const struct { + struct usb_functionfs_descs_head header; + struct { + struct usb_interface_descriptor intf; + struct usb_endpoint_descriptor_no_audio source; + struct usb_endpoint_descriptor_no_audio sink; + } __attribute__((packed)) fs_descs, hs_descs; +} __attribute__((packed)) descriptors = { + .header = { + .magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC), + .length = cpu_to_le32(sizeof(descriptors)), + .fs_count = 3, + .hs_count = 3, + }, + .fs_descs = { + .intf = { + .bLength = sizeof(descriptors.fs_descs.intf), + .bDescriptorType = USB_DT_INTERFACE, + .bInterfaceNumber = 0, + .bNumEndpoints = 2, + .bInterfaceClass = FASTBOOT_CLASS, + .bInterfaceSubClass = FASTBOOT_SUBCLASS, + .bInterfaceProtocol = FASTBOOT_PROTOCOL, + .iInterface = 1, /* first string from the provided table */ + }, + .source = { + .bLength = sizeof(descriptors.fs_descs.source), + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = 1 | USB_DIR_OUT, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = MAX_PACKET_SIZE_FS, + }, + .sink = { + .bLength = sizeof(descriptors.fs_descs.sink), + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = 2 | USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = MAX_PACKET_SIZE_FS, + }, + }, + .hs_descs = { + .intf = { + .bLength = sizeof(descriptors.hs_descs.intf), + .bDescriptorType = USB_DT_INTERFACE, + .bInterfaceNumber = 0, + .bNumEndpoints = 2, + .bInterfaceClass = FASTBOOT_CLASS, + .bInterfaceSubClass = FASTBOOT_SUBCLASS, + .bInterfaceProtocol = FASTBOOT_PROTOCOL, + .iInterface = 1, /* first string from the provided table */ + }, + .source = { + .bLength = sizeof(descriptors.hs_descs.source), + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = 1 | USB_DIR_OUT, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = MAX_PACKET_SIZE_HS, + }, + .sink = { + .bLength = sizeof(descriptors.hs_descs.sink), + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = 2 | USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = MAX_PACKET_SIZE_HS, + }, + }, +}; + +#define STR_INTERFACE_ "Fastboot 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 int init_functionfs(struct usb_transport *usb_transport) +{ + ssize_t ret; + + D(VERBOSE, "OPENING %s", USB_FFS_FASTBOOT_EP0); + usb_transport->control = open(USB_FFS_FASTBOOT_EP0, O_RDWR); + if (usb_transport->control < 0) { + D(ERR, "[ %s: cannot open control endpoint: errno=%d]", USB_FFS_FASTBOOT_EP0, errno); + goto err; + } + + ret = write(usb_transport->control, &descriptors, sizeof(descriptors)); + if (ret < 0) { + D(ERR, "[ %s: write descriptors failed: errno=%d ]", USB_FFS_FASTBOOT_EP0, errno); + goto err; + } + + ret = write(usb_transport->control, &strings, sizeof(strings)); + if (ret < 0) { + D(ERR, "[ %s: writing strings failed: errno=%d]", USB_FFS_FASTBOOT_EP0, errno); + goto err; + } + + usb_transport->bulk_out = open(USB_FFS_FASTBOOT_OUT, O_RDWR); + if (usb_transport->bulk_out < 0) { + D(ERR, "[ %s: cannot open bulk-out ep: errno=%d ]", USB_FFS_FASTBOOT_OUT, errno); + goto err; + } + + usb_transport->bulk_in = open(USB_FFS_FASTBOOT_IN, O_RDWR); + if (usb_transport->bulk_in < 0) { + D(ERR, "[ %s: cannot open bulk-in ep: errno=%d ]", USB_FFS_FASTBOOT_IN, errno); + goto err; + } + + return 0; + +err: + if (usb_transport->bulk_in > 0) { + close(usb_transport->bulk_in); + usb_transport->bulk_in = -1; + } + if (usb_transport->bulk_out > 0) { + close(usb_transport->bulk_out); + usb_transport->bulk_out = -1; + } + if (usb_transport->control > 0) { + close(usb_transport->control); + usb_transport->control = -1; + } + return -1; +} + +static ssize_t bulk_write(int bulk_in, const char *buf, size_t length) +{ + size_t count = 0; + ssize_t ret; + + do { + ret = TEMP_FAILURE_RETRY(write(bulk_in, buf + count, length - count)); + if (ret < 0) { + D(WARN, "[ bulk_read failed fd=%d length=%d errno=%d %s ]", + bulk_in, length, errno, strerror(errno)); + return -1; + } else { + count += ret; + } + } while (count < length); + + D(VERBOSE, "[ bulk_write done fd=%d ]", bulk_in); + return count; +} + +static ssize_t usb_write(struct transport_handle *thandle, const void *data, size_t len) +{ + ssize_t ret; + struct transport *t = thandle->transport; + struct usb_transport *usb_transport = container_of(t, struct usb_transport, transport); + + D(DEBUG, "about to write (fd=%d, len=%d)", usb_transport->bulk_in, len); + ret = bulk_write(usb_transport->bulk_in, data, len); + if (ret < 0) { + D(ERR, "ERROR: fd = %d, ret = %zd", usb_transport->bulk_in, ret); + return -1; + } + D(DEBUG, "[ usb_write done fd=%d ]", usb_transport->bulk_in); + return ret; +} + +static ssize_t bulk_read(int bulk_out, char *buf, size_t length) +{ + ssize_t ret; + size_t n = 0; + + while (n < length) { + size_t to_read = (length - n > READ_BUF_SIZE) ? READ_BUF_SIZE : length - n; + ret = TEMP_FAILURE_RETRY(read(bulk_out, buf + n, to_read)); + if (ret < 0) { + D(WARN, "[ bulk_read failed fd=%d length=%d errno=%d %s ]", + bulk_out, length, errno, strerror(errno)); + return ret; + } + n += ret; + if (ret < (ssize_t)to_read) { + D(VERBOSE, "bulk_read short read, ret=%zd to_read=%u n=%u length=%u", + ret, to_read, n, length); + break; + } + } + + return n; +} + +ssize_t usb_read(struct transport_handle *thandle, void *data, size_t len) +{ + ssize_t ret; + struct transport *t = thandle->transport; + struct usb_transport *usb_transport = container_of(t, struct usb_transport, transport); + + D(DEBUG, "about to read (fd=%d, len=%d)", usb_transport->bulk_out, len); + ret = bulk_read(usb_transport->bulk_out, data, len); + if (ret < 0) { + D(ERR, "ERROR: fd = %d, ret = %zd", usb_transport->bulk_out, ret); + return -1; + } + D(DEBUG, "[ usb_read done fd=%d ret=%zd]", usb_transport->bulk_out, ret); + return ret; +} + +void usb_close(struct transport_handle *thandle) +{ + int err; + struct transport *t = thandle->transport; + struct usb_transport *usb_transport = container_of(t, struct usb_transport, transport); + + err = ioctl(usb_transport->bulk_in, FUNCTIONFS_CLEAR_HALT); + if (err < 0) + D(WARN, "[ kick: source (fd=%d) clear halt failed (%d) ]", usb_transport->bulk_in, errno); + + err = ioctl(usb_transport->bulk_out, FUNCTIONFS_CLEAR_HALT); + if (err < 0) + D(WARN, "[ kick: sink (fd=%d) clear halt failed (%d) ]", usb_transport->bulk_out, errno); + + pthread_mutex_lock(&usb_transport->lock); + close(usb_transport->control); + close(usb_transport->bulk_out); + close(usb_transport->bulk_in); + usb_transport->control = usb_transport->bulk_out = usb_transport->bulk_in = -1; + + pthread_cond_signal(&usb_transport->notify); + pthread_mutex_unlock(&usb_transport->lock); +} + +struct transport_handle *usb_connect(struct transport *transport) +{ + int ret; + struct usb_handle *usb_handle = calloc(sizeof(struct usb_handle), 1); + struct usb_transport *usb_transport = container_of(transport, struct usb_transport, transport); + + pthread_mutex_lock(&usb_transport->lock); + while (usb_transport->control != -1) + pthread_cond_wait(&usb_transport->notify, &usb_transport->lock); + pthread_mutex_unlock(&usb_transport->lock); + + ret = init_functionfs(usb_transport); + if (ret < 0) { + D(ERR, "usb connect: failed to initialize usb transport"); + return NULL; + } + + D(DEBUG, "[ usb_thread - registering device ]"); + return &usb_handle->handle; +} + +void usb_init() +{ + struct usb_transport *usb_transport = calloc(1, sizeof(struct usb_transport)); + + usb_transport->transport.connect = usb_connect; + usb_transport->transport.close = usb_close; + usb_transport->transport.read = usb_read; + usb_transport->transport.write = usb_write; + usb_transport->control = -1; + usb_transport->bulk_out = -1; + usb_transport->bulk_out = -1; + + pthread_cond_init(&usb_transport->notify, NULL); + pthread_mutex_init(&usb_transport->lock, NULL); + + transport_register(&usb_transport->transport); +} + |