1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <unistd.h>
18 #include <stdio.h>
19 #include <string.h>
20 #include <stdlib.h>
21
22 #include <sys/types.h>
23 #include <sys/stat.h>
24 #include <fcntl.h>
25 #include <errno.h>
26 #include <pthread.h>
27 #include <time.h>
28
29 #include <usbhost/usbhost.h>
30 #include <linux/usb/f_accessory.h>
31
32 struct usb_device *sDevice = NULL;
33
message_thread(void * arg)34 static void* message_thread(void* arg) {
35 int *endpoints = (int *)arg;
36 int ret = 0;
37 int num = 0;
38 char message[50];
39
40 while (sDevice && ret >= 0) {
41 char buffer[16384];
42 ret = usb_device_bulk_transfer(sDevice, endpoints[0], buffer, sizeof(buffer), 1000);
43 if (ret < 0 && errno == ETIMEDOUT) {
44 ret = 0;
45 }
46 if (ret > 0) {
47 printf("[RECV] ");
48 fwrite(buffer, 1, ret, stdout);
49 printf("\n");
50
51 // Respond by sending a message back
52 sprintf(message, "Message from Android accessory #%d", num++);
53 printf("[SENT] %s\n", message);
54 fflush(stdout);
55 usb_device_bulk_transfer(sDevice, endpoints[1], message, strlen(message), 1000);
56 }
57 }
58
59 return NULL;
60 }
61
milli_sleep(int millis)62 static void milli_sleep(int millis) {
63 struct timespec tm;
64
65 tm.tv_sec = 0;
66 tm.tv_nsec = millis * 1000000;
67 nanosleep(&tm, NULL);
68 }
69
send_string(struct usb_device * device,int index,const char * string)70 static void send_string(struct usb_device *device, int index, const char* string) {
71 int ret = usb_device_control_transfer(device, USB_DIR_OUT | USB_TYPE_VENDOR,
72 ACCESSORY_SEND_STRING, 0, index, (void *)string, strlen(string) + 1, 0);
73
74 // some devices can't handle back-to-back requests, so delay a bit
75 milli_sleep(10);
76 }
77
usb_device_added(const char * devname,void * client_data)78 static int usb_device_added(const char *devname, void* client_data) {
79 struct usb_descriptor_header* desc;
80 struct usb_descriptor_iter iter;
81 uint16_t vendorId, productId;
82 int ret;
83 pthread_t th;
84
85 struct usb_device *device = usb_device_open(devname);
86 if (!device) {
87 fprintf(stderr, "usb_device_open failed\n");
88 return 0;
89 }
90
91 vendorId = usb_device_get_vendor_id(device);
92 productId = usb_device_get_product_id(device);
93
94 if (!sDevice && (vendorId == 0x18D1 && (productId == 0x2D00 || productId == 0x2D01))) {
95 struct usb_descriptor_header* desc;
96 struct usb_descriptor_iter iter;
97 struct usb_interface_descriptor *intf = NULL;
98 struct usb_endpoint_descriptor *ep1 = NULL;
99 struct usb_endpoint_descriptor *ep2 = NULL;
100
101 printf("Found Android device in accessory mode (%x:%x)...\n",
102 vendorId, productId);
103 sDevice = device;
104
105 usb_descriptor_iter_init(device, &iter);
106 while ((desc = usb_descriptor_iter_next(&iter)) != NULL && (!intf || !ep1 || !ep2)) {
107 if (desc->bDescriptorType == USB_DT_INTERFACE) {
108 intf = (struct usb_interface_descriptor *)desc;
109 } else if (desc->bDescriptorType == USB_DT_ENDPOINT) {
110 if (ep1)
111 ep2 = (struct usb_endpoint_descriptor *)desc;
112 else
113 ep1 = (struct usb_endpoint_descriptor *)desc;
114 }
115 }
116
117 if (!intf) {
118 fprintf(stderr, "Interface not found\n");
119 exit(1);
120 }
121 if (!ep1 || !ep2) {
122 fprintf(stderr, "Endpoints not found\n");
123 exit(1);
124 }
125
126 if (usb_device_claim_interface(device, intf->bInterfaceNumber)) {
127 fprintf(stderr, "usb_device_claim_interface failed errno: %d\n", errno);
128 exit(1);
129 }
130
131 int endpoints[2];
132 if ((ep1->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) {
133 endpoints[0] = ep1->bEndpointAddress;
134 endpoints[1] = ep2->bEndpointAddress;
135 } else {
136 endpoints[0] = ep2->bEndpointAddress;
137 endpoints[1] = ep1->bEndpointAddress;
138 }
139 pthread_create(&th, NULL, message_thread, (void *)endpoints);
140 } else {
141 printf("Found possible Android device (%x:%x) "
142 "- attempting to switch to accessory mode...\n", vendorId, productId);
143
144 uint16_t protocol = 0;
145 ret = usb_device_control_transfer(device, USB_DIR_IN | USB_TYPE_VENDOR,
146 ACCESSORY_GET_PROTOCOL, 0, 0, &protocol, sizeof(protocol), 0);
147 if (ret == 2)
148 printf("Device supports protocol version %d\n", protocol);
149 else
150 fprintf(stderr, "Failed to read protocol version\n");
151
152 send_string(device, ACCESSORY_STRING_MANUFACTURER, "Android CTS");
153 send_string(device, ACCESSORY_STRING_MODEL, "CTS USB Accessory");
154 send_string(device, ACCESSORY_STRING_DESCRIPTION, "CTS USB Accessory");
155 send_string(device, ACCESSORY_STRING_VERSION, "1.0");
156 send_string(device, ACCESSORY_STRING_URI,
157 "http://source.android.com/compatibility/cts-intro.html");
158 send_string(device, ACCESSORY_STRING_SERIAL, "1234567890");
159
160 ret = usb_device_control_transfer(device, USB_DIR_OUT | USB_TYPE_VENDOR,
161 ACCESSORY_START, 0, 0, 0, 0, 0);
162 return 0;
163 }
164
165 if (device != sDevice)
166 usb_device_close(device);
167
168 return 0;
169 }
170
usb_device_removed(const char * devname,void * client_data)171 static int usb_device_removed(const char *devname, void* client_data) {
172 if (sDevice && !strcmp(usb_device_get_name(sDevice), devname)) {
173 usb_device_close(sDevice);
174 sDevice = NULL;
175 // exit when we are disconnected
176 return 1;
177 }
178 return 0;
179 }
180
181
main(int argc,char * argv[])182 int main(int argc, char* argv[]) {
183 printf("CTS USB Accessory Tester\n");
184
185 struct usb_host_context* context = usb_host_init();
186 if (!context) {
187 fprintf(stderr, "usb_host_init failed");
188 return 1;
189 }
190
191 // this will never return so it is safe to pass thiz directly
192 usb_host_run(context, usb_device_added, usb_device_removed, NULL, NULL);
193 return 0;
194 }
195