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      1 /*
      2  * Copyright (C) 2007 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 <stdio.h>
     18 #include <stdlib.h>
     19 #include <string.h>
     20 
     21 #include <sysdeps.h>
     22 
     23 #define  TRACE_TAG  TRACE_TRANSPORT
     24 #include "adb.h"
     25 
     26 #ifdef HAVE_BIG_ENDIAN
     27 #define H4(x)	(((x) & 0xFF000000) >> 24) | (((x) & 0x00FF0000) >> 8) | (((x) & 0x0000FF00) << 8) | (((x) & 0x000000FF) << 24)
     28 static inline void fix_endians(apacket *p)
     29 {
     30     p->msg.command     = H4(p->msg.command);
     31     p->msg.arg0        = H4(p->msg.arg0);
     32     p->msg.arg1        = H4(p->msg.arg1);
     33     p->msg.data_length = H4(p->msg.data_length);
     34     p->msg.data_check  = H4(p->msg.data_check);
     35     p->msg.magic       = H4(p->msg.magic);
     36 }
     37 unsigned host_to_le32(unsigned n)
     38 {
     39     return H4(n);
     40 }
     41 #else
     42 #define fix_endians(p) do {} while (0)
     43 unsigned host_to_le32(unsigned n)
     44 {
     45     return n;
     46 }
     47 #endif
     48 
     49 static int remote_read(apacket *p, atransport *t)
     50 {
     51     if(usb_read(t->usb, &p->msg, sizeof(amessage))){
     52         D("remote usb: read terminated (message)\n");
     53         return -1;
     54     }
     55 
     56     fix_endians(p);
     57 
     58     if(check_header(p)) {
     59         D("remote usb: check_header failed\n");
     60         return -1;
     61     }
     62 
     63     if(p->msg.data_length) {
     64         if(usb_read(t->usb, p->data, p->msg.data_length)){
     65             D("remote usb: terminated (data)\n");
     66             return -1;
     67         }
     68     }
     69 
     70     if(check_data(p)) {
     71         D("remote usb: check_data failed\n");
     72         return -1;
     73     }
     74 
     75     return 0;
     76 }
     77 
     78 static int remote_write(apacket *p, atransport *t)
     79 {
     80     unsigned size = p->msg.data_length;
     81 
     82     fix_endians(p);
     83 
     84     if(usb_write(t->usb, &p->msg, sizeof(amessage))) {
     85         D("remote usb: 1 - write terminated\n");
     86         return -1;
     87     }
     88     if(p->msg.data_length == 0) return 0;
     89     if(usb_write(t->usb, &p->data, size)) {
     90         D("remote usb: 2 - write terminated\n");
     91         return -1;
     92     }
     93 
     94     return 0;
     95 }
     96 
     97 static void remote_close(atransport *t)
     98 {
     99     usb_close(t->usb);
    100     t->usb = 0;
    101 }
    102 
    103 static void remote_kick(atransport *t)
    104 {
    105     usb_kick(t->usb);
    106 }
    107 
    108 void init_usb_transport(atransport *t, usb_handle *h, int state)
    109 {
    110     D("transport: usb\n");
    111     t->close = remote_close;
    112     t->kick = remote_kick;
    113     t->read_from_remote = remote_read;
    114     t->write_to_remote = remote_write;
    115     t->sync_token = 1;
    116     t->connection_state = state;
    117     t->type = kTransportUsb;
    118     t->usb = h;
    119 
    120     HOST = 0;
    121 }
    122