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/*
* Copyright (C) 2011 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 <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <pthread.h>
#include <time.h>
#include <usbhost/usbhost.h>
#include <linux/usb/f_accessory.h>
struct usb_device *sDevice = NULL;
static void* read_thread(void* arg) {
int endpoint = (int)(uintptr_t)arg;
int ret = 0;
while (sDevice && ret >= 0) {
char buffer[16384];
ret = usb_device_bulk_transfer(sDevice, endpoint, buffer, sizeof(buffer), 1000);
if (ret < 0 && errno == ETIMEDOUT)
ret = 0;
if (ret > 0) {
fwrite(buffer, 1, ret, stdout);
printf("\n");
fflush(stdout);
}
}
return NULL;
}
static void* write_thread(void* arg) {
int endpoint = (int)(uintptr_t)arg;
int ret = 0;
while (ret >= 0) {
char buffer[16384];
char *line = fgets(buffer, sizeof(buffer), stdin);
if (!line || !sDevice)
break;
ret = usb_device_bulk_transfer(sDevice, endpoint, line, strlen(line), 1000);
}
return NULL;
}
static void milli_sleep(int millis) {
struct timespec tm;
tm.tv_sec = 0;
tm.tv_nsec = millis * 1000000;
nanosleep(&tm, NULL);
}
static void send_string(struct usb_device *device, int index, const char* string) {
int ret = usb_device_control_transfer(device, USB_DIR_OUT | USB_TYPE_VENDOR,
ACCESSORY_SEND_STRING, 0, index, (void *)string, strlen(string) + 1, 0);
// some devices can't handle back-to-back requests, so delay a bit
milli_sleep(10);
}
static int usb_device_added(const char *devname, void* client_data) {
struct usb_descriptor_header* desc;
struct usb_descriptor_iter iter;
uint16_t vendorId, productId;
int ret;
pthread_t th;
struct usb_device *device = usb_device_open(devname);
if (!device) {
fprintf(stderr, "usb_device_open failed\n");
return 0;
}
vendorId = usb_device_get_vendor_id(device);
productId = usb_device_get_product_id(device);
if (vendorId == 0x18D1 || vendorId == 0x22B8 || vendorId == 0x04e8) {
if (!sDevice && (productId == 0x2D00 || productId == 0x2D01)) {
struct usb_descriptor_header* desc;
struct usb_descriptor_iter iter;
struct usb_interface_descriptor *intf = NULL;
struct usb_endpoint_descriptor *ep1 = NULL;
struct usb_endpoint_descriptor *ep2 = NULL;
printf("Found android device in accessory mode\n");
sDevice = device;
usb_descriptor_iter_init(device, &iter);
while ((desc = usb_descriptor_iter_next(&iter)) != NULL && (!intf || !ep1 || !ep2)) {
if (desc->bDescriptorType == USB_DT_INTERFACE) {
intf = (struct usb_interface_descriptor *)desc;
} else if (desc->bDescriptorType == USB_DT_ENDPOINT) {
if (ep1)
ep2 = (struct usb_endpoint_descriptor *)desc;
else
ep1 = (struct usb_endpoint_descriptor *)desc;
}
}
if (!intf) {
fprintf(stderr, "interface not found\n");
exit(1);
}
if (!ep1 || !ep2) {
fprintf(stderr, "endpoints not found\n");
exit(1);
}
if (usb_device_claim_interface(device, intf->bInterfaceNumber)) {
fprintf(stderr, "usb_device_claim_interface failed errno: %d\n", errno);
exit(1);
}
if ((ep1->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) {
pthread_create(&th, NULL, read_thread, (void *)(uintptr_t)ep1->bEndpointAddress);
pthread_create(&th, NULL, write_thread, (void *)(uintptr_t)ep2->bEndpointAddress);
} else {
pthread_create(&th, NULL, read_thread, (void *)(uintptr_t)ep2->bEndpointAddress);
pthread_create(&th, NULL, write_thread, (void *)(uintptr_t)ep1->bEndpointAddress);
}
} else {
printf("Found possible android device - attempting to switch to accessory mode\n");
uint16_t protocol;
ret = usb_device_control_transfer(device, USB_DIR_IN | USB_TYPE_VENDOR,
ACCESSORY_GET_PROTOCOL, 0, 0, &protocol, sizeof(protocol), 0);
if (ret == 2)
printf("device supports protocol version %d\n", protocol);
else
fprintf(stderr, "failed to read protocol version\n");
send_string(device, ACCESSORY_STRING_MANUFACTURER, "Google, Inc.");
send_string(device, ACCESSORY_STRING_MODEL, "AccessoryChat");
send_string(device, ACCESSORY_STRING_DESCRIPTION, "Accessory Chat");
send_string(device, ACCESSORY_STRING_VERSION, "1.0");
send_string(device, ACCESSORY_STRING_URI, "http://www.android.com");
send_string(device, ACCESSORY_STRING_SERIAL, "1234567890");
ret = usb_device_control_transfer(device, USB_DIR_OUT | USB_TYPE_VENDOR,
ACCESSORY_START, 0, 0, 0, 0, 0);
return 0;
}
}
if (device != sDevice)
usb_device_close(device);
return 0;
}
static int usb_device_removed(const char *devname, void* client_data) {
if (sDevice && !strcmp(usb_device_get_name(sDevice), devname)) {
usb_device_close(sDevice);
sDevice = NULL;
// exit when we are disconnected
return 1;
}
return 0;
}
int main(int argc, char* argv[]) {
struct usb_host_context* context = usb_host_init();
if (!context) {
fprintf(stderr, "usb_host_init failed");
return 1;
}
// this will never return so it is safe to pass thiz directly
usb_host_run(context, usb_device_added, usb_device_removed, NULL, NULL);
return 0;
}
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